/* roulang page: index */
:root {
            --primary: #2E7FA6;
            --primary-dark: #246A8C;
            --primary-soft: #EAF4FA;
            --accent: #35B99F;
            --accent-soft: #E3F8F2;
            --amber: #F4A936;
            --bg: #F6F9FC;
            --surface: #FFFFFF;
            --text-main: #213544;
            --text-muted: #607488;
            --border: #E2EDF4;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-btn: 10px;
            --shadow-card: 0 10px 24px -12px rgba(31, 71, 103, .12);
            --shadow-hover: 0 18px 34px -16px rgba(46, 127, 166, .2);
            --shadow-btn: 0 10px 18px -10px rgba(36, 106, 140, .35);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: var(--font-sans);
            font-size: 1rem;
            line-height: 1.75;
            color: var(--text-main);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            height: auto;
        }

        a {
            color: var(--primary);
            text-decoration: none;
        }

        a:hover {
            color: var(--primary-dark);
        }

        button {
            font-family: inherit;
        }

        .app-sidebar {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: 240px;
            background: var(--surface);
            border-right: 1px solid var(--border);
            z-index: 1050;
            display: flex;
            flex-direction: column;
        }

        .sidebar-inner {
            display: flex;
            flex-direction: column;
            height: 100%;
            padding: 28px 16px 24px;
        }

        .brand-area {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 0 10px 22px;
            border-bottom: 1px solid var(--border);
        }

        .brand-icon {
            width: 42px;
            height: 42px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.15rem;
            box-shadow: 0 8px 16px -8px rgba(46, 127, 166, .5);
            flex-shrink: 0;
        }

        .brand-text {
            font-size: 1.1rem;
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: .3px;
            color: var(--text-main);
            white-space: nowrap;
        }

        .nav-caption {
            font-size: .7rem;
            font-weight: 600;
            letter-spacing: 1px;
            color: #9AACBB;
            text-transform: uppercase;
            padding: 22px 12px 8px;
            margin: 0;
        }

        .sidebar-nav {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 6px;
            padding-top: 2px;
        }

        .nav-link-shell {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 11px 14px;
            border-radius: 10px;
            color: var(--text-muted);
            font-size: .94rem;
            font-weight: 500;
            transition: all .2s ease;
            border-left: 4px solid transparent;
            position: relative;
        }

        .nav-link-shell i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: #89A1B3;
            transition: color .2s;
        }

        .nav-link-shell:hover {
            background: #F0F6FA;
            color: var(--primary);
        }

        .nav-link-shell.active {
            background: var(--primary-soft);
            color: var(--primary);
            border-left: 4px solid var(--primary);
        }

        .nav-link-shell.active i {
            color: var(--primary);
        }

        .sidebar-bottom {
            border-top: 1px solid var(--border);
            padding-top: 20px;
            margin-top: 14px;
        }

        .btn-download {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 18px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: .94rem;
        }

        .version-note {
            display: block;
            text-align: center;
            color: #8AA1B3;
            font-size: .72rem;
            margin-top: 12px;
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(20, 39, 54, .5);
            z-index: 1040;
        }

        .sidebar-overlay.show {
            display: block;
        }

        .mobile-topbar {
            display: none;
            position: fixed;
            top: 0;
            right: 0;
            left: 0;
            height: 60px;
            background: var(--surface);
            z-index: 1030;
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
            border-bottom: 1px solid var(--border);
            box-shadow: 0 4px 16px rgba(31, 71, 103, .06);
        }

        .mobile-brand {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-main);
        }

        .menu-toggle {
            width: 40px;
            height: 40px;
            border: 1px solid var(--border);
            background: var(--bg);
            border-radius: 10px;
            color: var(--primary);
            font-size: 1rem;
        }

        .app-main {
            margin-left: 240px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .app-content {
            flex: 1;
        }

        .content-wrap {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 32px;
        }

        .btn {
            border-radius: var(--radius-btn);
            font-weight: 600;
            padding: 12px 22px;
        }

        .btn-primary {
            --bs-btn-bg: var(--primary);
            --bs-btn-border-color: var(--primary);
            --bs-btn-hover-bg: var(--primary-dark);
            --bs-btn-hover-border-color: var(--primary-dark);
            --bs-btn-active-bg: #1E5D78;
            --bs-btn-active-border-color: #1E5D78;
            --bs-btn-focus-shadow-rgb: 46, 127, 166;
            background: var(--primary);
            border-color: var(--primary);
            box-shadow: 0 8px 18px -10px rgba(46, 127, 166, .45);
            transition: all .2s ease;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-btn);
        }

        .btn-ghost {
            background: transparent;
            border: 1px solid rgba(46, 127, 166, .28);
            color: var(--primary);
        }

        .btn-ghost:hover {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-btn);
        }

        .btn-accent {
            background: var(--accent);
            border: 1px solid var(--accent);
            color: #fff;
        }

        .btn-accent:hover {
            background: #2EA88F;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 10px 18px -10px rgba(53, 185, 159, .5);
        }

        .section-pad {
            padding: 92px 0;
        }

        .section-title {
            font-size: clamp(1.6rem, 2.6vw, 2.1rem);
            font-weight: 700;
            line-height: 1.35;
            letter-spacing: -.2px;
            margin: 0 0 14px;
        }

        .section-subtitle {
            font-size: 1rem;
            color: var(--text-muted);
            max-width: 620px;
            margin: 0 auto;
            line-height: 1.8;
        }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: .78rem;
            font-weight: 600;
            color: var(--primary);
            background: var(--primary-soft);
            border-radius: 40px;
            padding: 6px 14px;
            margin-bottom: 18px;
        }

        .hero-section {
            background: linear-gradient(180deg, rgba(231, 244, 252, .94), rgba(246, 249, 252, .98)),
            url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            border-bottom: 1px solid var(--border);
            overflow: hidden;
        }

        .hero-title {
            font-size: clamp(1.9rem, 3.6vw, 2.75rem);
            font-weight: 700;
            line-height: 1.35;
            margin: 14px 0 20px;
            color: var(--text-main);
        }

        .hero-text {
            color: var(--text-muted);
            font-size: 1.03rem;
            line-height: 1.9;
            max-width: 540px;
            margin-bottom: 30px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 40px;
            padding: 7px 15px;
            font-size: .78rem;
            font-weight: 600;
            color: var(--primary);
            box-shadow: 0 6px 14px -8px rgba(31, 71, 103, .15);
        }

        .hero-badge i {
            color: var(--accent);
        }

        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }

        .hero-sysinfo {
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
            margin-top: 26px;
            color: #7A91A2;
            font-size: .82rem;
            font-weight: 500;
        }

        .hero-sysinfo span {
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }

        .hero-visual {
            position: relative;
            margin-left: 8px;
        }

        .hero-visual .hero-card-img {
            border-radius: 22px;
            width: 100%;
            object-fit: cover;
            box-shadow: 0 22px 42px -18px rgba(31, 71, 103, .25);
            border: 1px solid #fff;
        }

        .float-tag {
            position: absolute;
            right: -8px;
            bottom: -14px;
            background: var(--surface);
            border-radius: 12px;
            box-shadow: var(--shadow-card);
            padding: 10px 16px;
            font-size: .82rem;
            font-weight: 600;
            color: var(--text-main);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            border: 1px solid var(--border);
        }

        .float-tag i {
            color: var(--accent);
            font-size: 1rem;
        }

        .value-img {
            border-radius: 18px;
            width: 100%;
            object-fit: cover;
            box-shadow: var(--shadow-card);
        }

        .value-content {
            padding: 10px 0;
        }

        .value-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 46px;
            height: 46px;
            border-radius: 13px;
            background: var(--primary-soft);
            color: var(--primary);
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .value-content h3 {
            color: var(--text-main);
            font-weight: 700;
            font-size: 1.3rem;
            letter-spacing: -.1px;
            margin-bottom: 12px;
        }

        .value-content p {
            color: var(--text-muted);
            font-size: .95rem;
            line-height: 1.85;
            margin-bottom: 0;
        }

        .value-row+.value-row {
            margin-top: 64px;
        }

        .value-reverse .value-content {
            order: 2;
        }

        .section-alt {
            background: var(--surface);
        }

        .gallery-wrap {
            max-width: 920px;
            margin: 0 auto;
        }

        .carousel-inner {
            border-radius: 22px;
            overflow: hidden;
            box-shadow: 0 18px 36px -18px rgba(31, 71, 103, .18);
        }

        .carousel-item img {
            height: 460px;
            object-fit: cover;
            width: 100%;
        }

        .carousel-caption-slide {
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(0deg, rgba(20, 35, 45, .82), transparent);
            color: #fff;
            padding: 46px 26px 24px;
            text-align: left;
        }

        .carousel-caption-slide h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .carousel-caption-slide p {
            font-size: .84rem;
            opacity: .85;
            margin: 0;
        }

        .carousel-control-prev,
        .carousel-control-next {
            width: 46px;
            height: 46px;
            top: 50%;
            bottom: auto;
            transform: translateY(-50%);
            background: rgba(46, 127, 166, .14);
            border-radius: 50%;
            font-size: .8rem;
            color: var(--primary);
            border: none;
            opacity: 1;
            transition: all .2s ease;
        }

        .carousel-control-prev {
            left: 14px;
        }

        .carousel-control-next {
            right: 14px;
        }

        .carousel-control-prev:hover {
            background: var(--primary);
            color: #fff;
        }

        .carousel-control-next:hover {
            background: var(--primary);
            color: #fff;
        }

        .carousel-indicators {
            margin-bottom: -8px;
        }

        .carousel-indicators [data-bs-target] {
            width: 34px;
            height: 4px;
            background: var(--primary);
            border-radius: 2px;
            border: none;
        }

        .spec-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            height: 100%;
            transition: all .25s ease;
            box-shadow: var(--shadow-card);
        }

        .spec-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .spec-icon {
            width: 34px;
            height: 34px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 9px;
            font-size: 1rem;
            margin-bottom: 10px;
        }

        .spec-icon.android {
            background: #E8F4F0;
            color: var(--accent);
        }

        .spec-icon.ios {
            background: var(--primary-soft);
            color: var(--primary);
        }

        .spec-icon.pc {
            background: #F4EFE6;
            color: var(--amber);
        }

        .spec-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin: 6px 0 18px;
        }

        .spec-row {
            display: flex;
            justify-content: space-between;
            align-items: baseline;
            padding: 9px 0;
            border-bottom: 1px dashed var(--border);
            font-size: .88rem;
        }

        .spec-row:last-child {
            border-bottom: none;
        }

        .spec-row dt {
            color: var(--text-muted);
            margin-right: 20px;
        }

        .spec-row dd {
            margin: 0;
            color: var(--text-main);
            font-weight: 500;
            text-align: right;
        }

        .review-wrap {
            background: #F4F8FB;
            padding: 92px 0;
        }

        .rating-summary {
            text-align: center;
            margin-bottom: 48px;
        }

        .rating-score {
            font-size: 3rem;
            font-weight: 800;
            color: var(--text-main);
            line-height: 1.2;
        }

        .rating-star {
            color: var(--amber);
            font-size: 1.1rem;
        }

        .rating-source {
            color: var(--text-muted);
            font-size: .85rem;
            display: block;
            margin-top: 8px;
        }

        .review-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 26px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-card);
            transition: all .25s ease;
            height: auto;
        }

        .review-card:hover {
            box-shadow: var(--shadow-hover);
        }

        .review-card .rating-star {
            display: block;
            margin-bottom: 14px;
        }

        .review-card p {
            color: #3A5162;
            font-size: .92rem;
            line-height: 1.85;
            margin-bottom: 18px;
        }

        .review-author {
            font-weight: 600;
            color: var(--text-main);
            font-size: .85rem;
        }

        .review-date {
            color: #9AAEC0;
            font-size: .74rem;
            display: block;
            margin-top: 4px;
        }

        .news-section {
            background: var(--surface);
        }

        .news-section .section-head {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 34px;
        }

        .news-cat-links {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .news-cat-links a {
            color: var(--text-muted);
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: 40px;
            padding: 6px 14px;
            font-size: .78rem;
            font-weight: 500;
            transition: all .15s ease;
        }

        .news-cat-links a:hover {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            box-shadow: var(--shadow-btn);
        }

        .news-list-card {
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            background: var(--bg);
            padding: 8px 28px;
        }

        .news-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border);
        }

        .news-item:last-child {
            border-bottom: none;
        }

        .news-left {
            flex: 1 1 420px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .news-title {
            font-size: 1.02rem;
            font-weight: 600;
            margin: 0;
        }

        .news-title a {
            color: var(--text-main);
            transition: color .15s;
        }

        .news-title a:hover {
            color: var(--primary);
        }

        .news-summary {
            color: var(--text-muted);
            font-size: .85rem;
            line-height: 1.7;
            margin: 0;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-meta {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .news-cat {
            background: var(--primary-soft);
            color: var(--primary);
            font-size: .72rem;
            font-weight: 600;
            border-radius: 6px;
            padding: 3px 9px;
            white-space: nowrap;
        }

        .news-date {
            color: #9AAEC0;
            font-size: .75rem;
            white-space: nowrap;
        }

        .news-link-more {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            color: var(--primary);
            font-size: .86rem;
            font-weight: 500;
            white-space: nowrap;
        }

        .news-link-more:hover {
            color: var(--primary-dark);
        }

        .news-empty {
            text-align: center;
            padding: 44px 0;
            color: var(--text-muted);
            font-size: .9rem;
            margin: 0;
        }

        .faq-section {
            background: var(--bg);
        }

        .accordion {
            --bs-accordion-bg: var(--surface);
            --bs-accordion-border-width: 0;
            border-radius: var(--radius-lg);
            overflow: hidden;
        }

        .accordion-item {
            background: transparent;
            border: none;
            border-bottom: 1px solid var(--border);
        }

        .accordion-item:last-child {
            border-bottom: none;
        }

        .accordion-button {
            background: transparent;
            color: var(--text-main);
            font-weight: 600;
            font-size: 1rem;
            padding: 22px 6px;
            border: none;
            box-shadow: none;
            outline: none;
            transition: all .2s;
        }

        .accordion-button:hover {
            color: var(--primary);
            background: transparent;
        }

        .accordion-button:not(.collapsed) {
            background: transparent;
            color: var(--primary);
            box-shadow: none;
        }

        .accordion-button:focus {
            outline: 2px solid rgba(46, 127, 166, .2);
            outline-offset: -3px;
            border-radius: 8px;
            box-shadow: none;
        }

        .accordion-button::after {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%232E7FA6'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e");
            transition: transform .25s ease;
            width: 1em;
            height: 1em;
        }

        .accordion-button:not(.collapsed)::after {
            transform: rotate(-180deg);
        }

        .accordion-body {
            padding: 0 6px 24px;
            color: var(--text-muted);
            font-size: .92rem;
            line-height: 1.85;
        }

        .cta-download {
            background: linear-gradient(120deg, #F3FAFD, #E7F1F7);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .cta-download h2 {
            font-weight: 800;
            letter-spacing: -.3px;
        }

        .cta-download p {
            color: var(--text-muted);
        }

        .download-btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin-top: 12px;
        }

        .version-tag-line {
            color: #8AA1B3;
            font-size: .75rem;
            margin-top: 20px;
        }

        .app-footer {
            margin-left: 240px;
            background: #EDF2F7;
            border-top: 1px solid var(--border);
        }

        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 32px 30px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 4px;
        }

        .footer-brand .brand-icon {
            width: 34px;
            height: 34px;
            font-size: .85rem;
            border-radius: 9px;
        }

        .footer-brand-text {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-main);
        }

        .footer-bottom {
            border-top: 1px solid #D7E3EB;
            margin-top: 27px;
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            gap: 16px;
            flex-wrap: wrap;
            color: #7E91A0;
            font-size: .78rem;
        }

        .footer-copyright {
            color: #7E91A0;
        }

        .footer-links {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            align-items: center;
        }

        .footer-links a {
            color: #5A7182;
        }

        .footer-links a:hover {
            color: var(--primary);
        }

        .footer-domain {
            color: #7E91A0;
        }

        .go-top {
            position: fixed;
            right: 24px;
            bottom: 24px;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--surface);
            border: 1px solid var(--border);
            color: var(--primary);
            font-size: 1.1rem;
            box-shadow: var(--shadow-card);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1020;
            opacity: 0;
            pointer-events: none;
            transition: opacity .25s ease;
        }

        .go-top.show {
            opacity: 1;
            pointer-events: auto;
        }

        .go-top:hover {
            background: var(--primary);
            color: #fff;
        }

        @media (max-width: 991.98px) {
            .app-sidebar {
                transform: translateX(-100%);
                transition: transform .3s ease;
                box-shadow: 0 0 36px rgba(20, 39, 54, .15);
            }

            .app-sidebar.show {
                transform: translateX(0);
            }

            .mobile-topbar {
                display: flex;
            }

            .app-main {
                margin-left: 0;
                padding-top: 60px;
            }

            .app-footer {
                margin-left: 0;
            }

            .section-pad {
                padding: 64px 0;
            }

            .news-section .section-head {
                flex-direction: column;
                align-items: flex-start;
            }

            .carousel-item img {
                height: 300px;
            }
        }

        @media (max-width: 767.98px) {
            .content-wrap {
                padding: 0 16px;
            }

            .hero-title {
                font-size: 1.75rem;
            }

            .hero-buttons {
                flex-direction: column;
            }

            .hero-buttons .btn {
                width: 100%;
            }

            .hero-visual {
                margin: 40px 0 0;
            }

            .hero-visual .hero-card-img {
                border-radius: 14px;
            }

            .product-visual {
                margin-top: 24px;
            }

            .section-pad {
                padding: 52px 0;
            }

            .section-title {
                font-size: 1.6rem;
            }

            .value-row {
                margin-top: 36px !important;
            }

            .value-img {
                border-radius: 12px;
            }

            .news-item {
                flex-direction: column;
                align-items: flex-start;
            }

            .news-meta {
                width: 100%;
                justify-content: space-between;
                gap: 6px;
            }

            .news-title {
                font-size: .98rem;
            }

            .carousel-item img {
                height: 220px;
            }

            .carousel-caption-slide {
                padding: 22px 14px 14px;
            }

            .carousel-caption-slide h3 {
                font-size: .98rem;
            }

            .carousel-caption-slide p {
                font-size: .76rem;
            }

            .carousel-control-prev,
            .carousel-control-next {
                width: 36px;
                height: 36px;
                transform: translateY(-30%);
            }

            .carousel-control-prev {
                left: 8px;
            }

            .carousel-control-next {
                right: 8px;
            }

            .accordion-button {
                font-size: .95rem;
            }

            .footer-inner {
                padding: 32px 16px 24px;
            }

            .footer-bottom {
                flex-direction: column;
                gap: 10px;
            }
        }

        @media (min-width: 992px) and (max-width: 1199.98px) {
            .content-wrap {
                padding: 0 24px;
            }
        }

/* roulang page: article */
:root {
            --brand: #2E7FA6;
            --brand-dark: #246A8C;
            --brand-soft: #EAF2F8;
            --accent: #35B99F;
            --accent-soft: #E4F7F2;
            --amber: #F4A936;
            --bg: #F6F9FC;
            --surface: #FFFFFF;
            --text: #213544;
            --muted: #607488;
            --line: #E2EDF4;
            --radius-lg: 16px;
            --radius-md: 10px;
            --radius-sm: 8px;
            --shadow-card: 0 10px 24px -12px rgba(31, 71, 103, .12);
            --shadow-hover: 0 18px 34px -16px rgba(46, 127, 166, .2);
            --shadow-btn: 0 10px 18px -10px rgba(36, 106, 140, .4);
            --sidebar-w: 240px;
            --content-gap: 32px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            background: var(--bg);
            color: var(--text);
            font-size: 16px;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color .2s ease;
        }

        a:focus-visible,
        button:focus-visible {
            outline: 3px solid rgba(46, 127, 166, .35);
            outline-offset: 2px;
            border-radius: 6px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        ul,
        ol {
            padding-left: 1.25rem;
        }

        .site-shell {
            min-height: 100vh;
        }

        .sidebar-overlay {
            position: fixed;
            inset: 0;
            z-index: 1040;
            background: rgba(33, 53, 68, .45);
            backdrop-filter: blur(2px);
            opacity: 0;
            visibility: hidden;
            transition: opacity .3s ease, visibility .3s ease;
        }

        .sidebar-overlay.show {
            opacity: 1;
            visibility: visible;
        }

        .app-sidebar {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: var(--sidebar-w);
            background: var(--surface);
            border-right: 1px solid var(--line);
            display: flex;
            flex-direction: column;
            z-index: 1050;
            padding: 28px 18px 20px;
            overflow-y: auto;
            transition: transform .32s ease;
        }

        .sidebar-brand {
            padding: 0 8px 22px;
            border-bottom: 1px solid var(--line);
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .brand-icon {
            width: 42px;
            height: 42px;
            border-radius: 13px;
            background: var(--brand);
            color: #fff;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.05rem;
            box-shadow: 0 8px 18px -8px rgba(46, 127, 166, .7);
        }

        .brand-text {
            font-size: 1.12rem;
            font-weight: 700;
            color: var(--text);
            letter-spacing: .02em;
            line-height: 1.3;
        }

        .brand-badge {
            display: inline-flex;
            align-items: center;
            margin-top: 12px;
            padding: 4px 10px;
            border-radius: 20px;
            background: var(--accent-soft);
            color: #218875;
            font-size: .75rem;
            font-weight: 600;
        }

        .brand-badge i {
            font-size: .7rem;
            margin-right: 4px;
        }

        .sidebar-nav-wrap {
            flex: 1;
            margin-top: 22px;
        }

        .nav-caption {
            font-size: .72rem;
            font-weight: 600;
            color: var(--muted);
            letter-spacing: .18em;
            text-transform: uppercase;
            padding: 0 12px 8px;
        }

        .nav-link-shell {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 6px;
            padding: 11px 12px;
            border-radius: 10px;
            color: var(--text);
            font-weight: 500;
            font-size: .94rem;
            border-left: 4px solid transparent;
            transition: background .2s ease, color .2s ease, border-color .2s ease;
        }

        .nav-link-shell i {
            width: 22px;
            text-align: center;
            color: #8094A8;
            transition: color .2s ease;
        }

        .nav-link-shell:hover {
            background: #F2F7FB;
            color: var(--brand-dark);
        }

        .nav-link-shell:hover i {
            color: var(--brand);
        }

        .nav-link-shell.active {
            background: var(--brand-soft);
            color: var(--brand-dark);
            border-left-color: var(--brand);
            font-weight: 600;
        }

        .nav-link-shell.active i {
            color: var(--brand);
        }

        .sidebar-bottom {
            margin-top: 20px;
            padding: 18px 10px 6px;
            border-top: 1px solid var(--line);
        }

        .side-download {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            width: 100%;
            padding: 12px 14px;
            background: var(--brand);
            color: #fff;
            font-weight: 600;
            border-radius: 10px;
            font-size: .92rem;
            transition: background .2s ease, box-shadow .2s ease, transform .2s ease;
        }

        .side-download:hover {
            background: var(--brand-dark);
            box-shadow: var(--shadow-btn);
            color: #fff;
            transform: translateY(-2px);
        }

        .side-verify {
            margin: 14px 0 0;
            font-size: .76rem;
            color: var(--muted);
            text-align: center;
        }

        .side-verify i {
            color: var(--accent);
            margin-right: 4px;
        }

        .content-col {
            margin-left: var(--sidebar-w);
            display: flex;
            flex-direction: column;
            min-height: 100vh;
            background:
                radial-gradient(circle at 80% 0%, rgba(46, 127, 166, .06), transparent 30%),
                var(--bg);
        }

        .mobile-topbar {
            display: none;
            position: sticky;
            top: 0;
            z-index: 1035;
            height: 60px;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--line);
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
        }

        .mobile-brand {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            color: var(--text);
            font-size: 1.02rem;
        }

        .mobile-brand .brand-icon {
            width: 32px;
            height: 32px;
            border-radius: 9px;
            font-size: .8rem;
        }

        .menu-toggle {
            width: 42px;
            height: 42px;
            border: 1px solid var(--line);
            background: #fff;
            border-radius: 10px;
            color: var(--text);
            font-size: 1.1rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: background .2s ease, border-color .2s ease;
        }

        .menu-toggle:hover {
            background: var(--brand-soft);
            border-color: rgba(46, 127, 166, .35);
        }

        .page-main {
            flex: 1;
            width: 100%;
            max-width: 1240px;
            margin: 0 auto;
            padding: 46px 24px 72px;
        }

        .page-main.compact {
            max-width: 1060px;
        }

        .article-layout {
            max-width: 860px;
            margin: 0 auto;
        }

        .breadcrumb-links {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px;
            font-size: .84rem;
            color: var(--muted);
            margin-bottom: 18px;
            list-style: none;
            padding: 0;
        }

        .breadcrumb-links a {
            color: var(--brand);
        }

        .breadcrumb-links a:hover {
            color: var(--brand-dark);
            text-decoration: underline;
        }

        .breadcrumb-links .divider {
            color: #B6C9D6;
            font-size: .7rem;
        }

        .breadcrumb-links .current {
            color: #8598A8;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 40vw;
        }

        .article-card {
            background: var(--surface);
            border: 1px solid rgba(226, 237, 244, .8);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            padding: 48px 54px 38px;
            margin-bottom: 24px;
        }

        .article-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--brand);
            font-size: .82rem;
            font-weight: 600;
            letter-spacing: .06em;
            margin-bottom: 8px;
        }

        .article-eyebrow i {
            color: var(--accent);
        }

        .article-title {
            font-size: clamp(1.65rem, 3vw, 2.4rem);
            font-weight: 700;
            line-height: 1.35;
            margin: 0 0 18px;
            color: var(--text);
            letter-spacing: -.01em;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 22px;
            padding: 14px 0 18px;
            border-top: 1px solid var(--line);
            border-bottom: 1px solid var(--line);
            color: var(--muted);
            font-size: .84rem;
            margin-bottom: 30px;
        }

        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta i {
            color: var(--brand);
            opacity: .85;
            width: 15px;
            text-align: center;
        }

        .article-body {
            font-size: 1rem;
            line-height: 1.9;
            color: #2E4350;
            word-break: break-word;
        }

        .article-body p {
            margin: 0 0 26px;
        }

        .article-body h2 {
            font-size: 1.55rem;
            font-weight: 700;
            line-height: 1.45;
            margin: 40px 0 16px;
            color: var(--text);
            padding-left: 14px;
            border-left: 4px solid var(--brand);
        }

        .article-body h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin: 30px 0 12px;
            color: var(--text);
        }

        .article-body img {
            border-radius: 14px;
            margin: 28px 0;
            box-shadow: 0 12px 30px -18px rgba(31, 71, 103, .35);
        }

        .article-body blockquote {
            margin: 30px 0;
            padding: 20px 22px;
            background: #F1F7FB;
            border-left: 4px solid var(--accent);
            border-radius: 0 12px 12px 0;
            color: #3B5563;
            font-style: normal;
        }

        .article-body blockquote p {
            margin-bottom: 8px;
        }

        .article-body blockquote p:last-child {
            margin-bottom: 0;
        }

        .article-body ul,
        .article-body ol {
            margin: 0 0 26px;
            padding-left: 1.6rem;
        }

        .article-body li {
            margin-bottom: 8px;
        }

        .article-body a {
            color: var(--brand);
            border-bottom: 1px solid rgba(46, 127, 166, .3);
        }

        .article-body a:hover {
            color: var(--brand-dark);
            border-bottom-color: var(--brand-dark);
        }

        .article-body table {
            width: 100%;
            margin: 26px 0;
            border-collapse: collapse;
            font-size: .92rem;
        }

        .article-body th {
            background: var(--brand-soft);
            color: var(--text);
            font-weight: 600;
            text-align: left;
            padding: 12px 14px;
        }

        .article-body td,
        .article-body th {
            border: 1px solid var(--line);
            padding: 10px 14px;
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin: 20px 0 28px;
        }

        .article-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 13px;
            background: #F0F6FA;
            border: 1px solid var(--line);
            border-radius: 20px;
            color: var(--muted);
            font-size: .8rem;
        }

        .article-tag i {
            color: var(--accent);
            font-size: .72rem;
        }

        .article-cta {
            position: relative;
            border-radius: 18px;
            padding: 40px 44px;
            color: #fff;
            overflow: hidden;
            background:
                linear-gradient(135deg, rgba(46, 127, 166, .94), rgba(33, 84, 102, .96)),
                url('/assets/images/backpic/back-1.webp') center/cover;
            margin: 34px 0 26px;
            box-shadow: 0 22px 44px -24px rgba(31, 71, 103, .5);
        }

        .article-cta::after {
            content: "";
            position: absolute;
            right: -50px;
            bottom: -50px;
            width: 180px;
            height: 180px;
            border: 18px solid rgba(255, 255, 255, .08);
            border-radius: 50%;
            pointer-events: none;
        }

        .article-cta h2 {
            font-size: 1.45rem;
            font-weight: 700;
            margin: 0 0 6px;
            color: #fff;
            letter-spacing: .02em;
        }

        .article-cta p {
            margin: 0 0 22px;
            font-size: .92rem;
            opacity: .9;
        }

        .dl-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            position: relative;
            z-index: 2;
        }

        .btn-dl,
        .btn-dl-outline,
        .btn-dl-light,
        .btn-back {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 22px;
            border-radius: 10px;
            font-weight: 600;
            font-size: .9rem;
            border: 1px solid transparent;
            transition: transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease;
        }

        .btn-dl {
            background: #fff;
            color: var(--brand-dark);
            box-shadow: 0 10px 18px -10px rgba(0, 0, 0, .25);
        }

        .btn-dl:hover {
            transform: translateY(-2px);
            box-shadow: 0 14px 22px -12px rgba(0, 0, 0, .3);
            color: var(--brand-dark);
        }

        .btn-dl-outline {
            background: transparent;
            border-color: rgba(255, 255, 255, .55);
            color: #fff;
        }

        .btn-dl-outline:hover {
            background: rgba(255, 255, 255, .14);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }

        .btn-dl-light {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 10px 18px -10px rgba(53, 185, 159, .5);
        }

        .btn-dl-light:hover {
            background: #2BAA93;
            color: #fff;
            transform: translateY(-2px);
        }

        .article-resources {
            margin: 20px 0 32px;
        }

        .resources-head {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            margin-bottom: 18px;
        }

        .resources-head h2 {
            font-size: 1.2rem;
            font-weight: 700;
            margin: 0;
            color: var(--text);
        }

        .resources-link {
            font-size: .86rem;
            color: var(--brand);
            white-space: nowrap;
        }

        .resources-link i {
            font-size: .75rem;
            margin-left: 4px;
        }

        .resources-grid {
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 18px;
        }

        .resource-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: 15px;
            overflow: hidden;
            transition: transform .25s ease, box-shadow .25s ease;
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .resource-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }

        .resource-thumb {
            position: relative;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--brand-soft);
        }

        .resource-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }

        .resource-card:hover .resource-thumb img {
            transform: scale(1.04);
        }

        .resource-body {
            padding: 18px 20px 22px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .resource-cat {
            align-self: flex-start;
            margin-bottom: 8px;
            background: var(--accent-soft);
            color: #218875;
            border-radius: 20px;
            padding: 3px 11px;
            font-size: .74rem;
            font-weight: 600;
            letter-spacing: .03em;
        }

        .resource-body h3 {
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.5;
            margin: 0 0 8px;
        }

        .resource-body .resource-date {
            font-size: .79rem;
            color: var(--muted);
            margin-top: auto;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .article-backbar {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
            justify-content: space-between;
            border-top: 1px solid var(--line);
            padding-top: 24px;
        }

        .btn-back {
            background: var(--brand-soft);
            color: var(--brand-dark);
            border: 1px solid transparent;
            padding: 10px 18px;
        }

        .btn-back:hover {
            background: #DDEBF2;
            color: var(--brand-dark);
        }

        .btn-back-plain {
            color: var(--muted);
            font-size: .88rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .btn-back-plain:hover {
            color: var(--brand);
        }

        .article-empty {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            padding: 70px 40px;
            text-align: center;
            max-width: 720px;
            margin: 0 auto;
        }

        .article-empty .empty-icon {
            width: 76px;
            height: 76px;
            background: var(--brand-soft);
            color: var(--brand);
            border-radius: 26px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 24px;
        }

        .article-empty h1 {
            font-size: 1.7rem;
            font-weight: 700;
            margin: 0 0 10px;
        }

        .article-empty p {
            color: var(--muted);
            max-width: 460px;
            margin: 0 auto 26px;
        }

        .empty-actions {
            display: flex;
            gap: 12px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn-brand-solid {
            background: var(--brand);
            color: #fff;
            padding: 11px 26px;
            border-radius: 10px;
            font-weight: 600;
            border: 1px solid transparent;
            transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
        }

        .btn-brand-solid:hover {
            background: var(--brand-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-btn);
        }

        .btn-brand-outline {
            background: transparent;
            color: var(--brand);
            border: 1px solid rgba(46, 127, 166, .4);
            padding: 11px 26px;
            border-radius: 10px;
            font-weight: 600;
            transition: background .2s ease, color .2s ease, transform .2s ease;
        }

        .btn-brand-outline:hover {
            background: var(--brand);
            color: #fff;
            transform: translateY(-2px);
        }

        .app-footer {
            width: 100%;
            background: var(--surface);
            border-top: 1px solid var(--line);
            padding: 0 24px;
        }

        .footer-inner {
            max-width: 1240px;
            margin: 0 auto;
            padding: 28px 0 26px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 14px;
        }

        .footer-brand .brand-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            font-size: .9rem;
        }

        .footer-brand-text {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text);
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px 16px;
            color: var(--muted);
            font-size: .82rem;
        }

        .footer-links {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
        }

        .footer-links a {
            color: var(--muted);
        }

        .footer-links a:hover {
            color: var(--brand);
        }

        .footer-bottom span {
            color: #8A9CAB;
        }

        .footer-domain {
            font-size: .78rem;
        }

        @media (max-width: 991.98px) {
            .app-sidebar {
                width: 276px;
                transform: translateX(-108%);
                box-shadow: 12px 0 34px rgba(31, 71, 103, .16);
            }

            .app-sidebar.open {
                transform: translateX(0);
            }

            .content-col {
                margin-left: 0;
            }

            .mobile-topbar {
                display: flex;
            }

            .page-main {
                padding: 30px 16px 54px;
            }

            .article-card {
                padding: 32px 28px 28px;
            }

            .article-cta {
                padding: 32px 28px;
            }

            .footer-inner {
                padding: 24px 0 20px;
            }
        }

        @media (max-width: 767.98px) {
            .article-title {
                font-size: 1.5rem;
                line-height: 1.4;
            }

            .article-card {
                border-radius: 14px;
                padding: 24px 20px 22px;
            }

            .article-meta {
                gap: 6px 14px;
                font-size: .78rem;
                padding: 12px 0 14px;
            }

            .dl-btn-group .btn-dl,
            .dl-btn-group .btn-dl-outline,
            .dl-btn-group .btn-dl-light {
                flex: 1 1 auto;
            }

            .article-cta {
                padding: 30px 20px;
                border-radius: 14px;
            }

            .article-cta h2 {
                font-size: 1.2rem;
            }

            .resources-grid {
                grid-template-columns: 1fr;
            }

            .resource-thumb {
                aspect-ratio: 16 / 8;
            }

            .article-backbar {
                flex-direction: column;
                align-items: flex-start;
            }

            .article-empty {
                padding: 46px 20px;
            }

            .breadcrumb-links .current {
                max-width: 70vw;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }

        @media (max-width: 420px) {
            .page-main {
                padding: 24px 12px 44px;
            }

            .article-card {
                padding: 20px 16px;
            }

            .article-title {
                font-size: 1.35rem;
            }

            .dl-btn-group {
                flex-direction: column;
            }
        }

        @media (min-width: 1200px) {
            .page-main {
                padding-top: 58px;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #2E7FA6;
            --primary-dark: #246A8C;
            --primary-deep: #1D5876;
            --accent: #35B99F;
            --accent-dark: #289A84;
            --accent-soft: #E2F5F0;
            --warning: #F4A936;
            --body-bg: #F6F9FC;
            --card-bg: #FFFFFF;
            --text-main: #213544;
            --text-sub: #607488;
            --border: #E2EDF4;
            --hero-light: #F3FAFD;
            --radius-card: 16px;
            --radius-btn: 12px;
            --radius-tag: 8px;
            --shadow-card: 0 10px 24px -12px rgba(31, 71, 103, .12);
            --shadow-hover: 0 18px 34px -16px rgba(46, 127, 166, .2);
            --shadow-btn: 0 10px 18px -10px rgba(36, 106, 140, .35);
            --sidebar-width: 240px;
            --font-main: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            background: var(--body-bg);
            font-family: var(--font-main);
            font-size: 1rem;
            line-height: 1.75;
            color: var(--text-main);
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color .2s ease, background .2s ease, box-shadow .2s ease, border-color .2s ease, transform .2s ease;
        }

        a:focus-visible,
        button:focus-visible,
        .nav-link-shell:focus-visible {
            outline: 3px solid rgba(46, 127, 166, .35);
            outline-offset: 3px;
        }

        img {
            max-width: 100%;
            display: block;
        }

        button,
        input {
            font-family: inherit;
        }

        h1,
        h2,
        h3,
        h4,
        p,
        ul,
        figure {
            margin: 0;
        }

        .container-page {
            width: 100%;
            max-width: 1180px;
            margin: 0 auto;
            padding-left: 28px;
            padding-right: 28px;
        }

        .app-sidebar {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: var(--sidebar-width);
            background: #FFFFFF;
            border-right: 1px solid var(--border);
            z-index: 1055;
            display: flex;
            flex-direction: column;
            padding: 28px 0 24px;
            transition: transform .28s ease;
        }

        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 0 22px 24px;
            border-bottom: 1px solid var(--border);
        }

        .brand-icon {
            width: 42px;
            height: 42px;
            border-radius: 13px;
            background: linear-gradient(145deg, #35B99F, #2E7FA6);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 15px;
            box-shadow: 0 8px 16px -8px rgba(46, 127, 166, .5);
            flex: 0 0 auto;
        }

        .brand-text-item {
            min-width: 0;
        }

        .brand-text-item .brand-name {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-main);
            line-height: 1.3;
            letter-spacing: .02em;
            white-space: nowrap;
        }

        .brand-text-item .brand-tag {
            display: block;
            font-size: 12px;
            color: var(--text-sub);
            line-height: 1.35;
            margin-top: 2px;
            letter-spacing: .05em;
        }

        .sidebar-nav-area {
            flex: 1;
            padding: 20px 14px 14px;
            overflow-y: auto;
        }

        .nav-caption {
            font-size: 12px;
            font-weight: 600;
            letter-spacing: .08em;
            text-transform: uppercase;
            color: #8FA6B8;
            padding: 0 14px 12px;
        }

        .nav-link-shell {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            margin-bottom: 6px;
            border-radius: 12px;
            color: var(--text-main);
            font-weight: 500;
            font-size: 15px;
            background: transparent;
            border: 0;
            width: 100%;
            text-align: left;
            transition: background .2s ease, color .2s ease, box-shadow .2s ease;
        }

        .nav-link-shell i {
            width: 20px;
            text-align: center;
            color: #829AAC;
            font-size: 16px;
            transition: color .2s ease;
        }

        .nav-link-shell:hover {
            background: #F1F6FA;
            color: var(--primary-dark);
        }

        .nav-link-shell:hover i {
            color: var(--primary);
        }

        .nav-link-shell.active {
            background: #EAF3F8;
            color: var(--primary-dark);
            box-shadow: inset 4px 0 0 var(--primary);
            font-weight: 600;
        }

        .nav-link-shell.active i {
            color: var(--primary);
        }

        .sidebar-footer {
            padding: 18px 22px 0;
            border-top: 1px solid var(--border);
            margin-top: 10px;
        }

        .sidebar-footer .btn {
            width: 100%;
            margin-bottom: 14px;
        }

        .side-meta-line {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 12px;
            color: var(--text-sub);
            padding: 2px 2px 0;
        }

        .side-meta-line i {
            color: var(--accent);
            font-size: 13px;
        }

        .mobile-topbar {
            display: none;
        }

        .nav-backdrop {
            display: none;
        }

        .main-content {
            margin-left: var(--sidebar-width);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .content-inner {
            flex: 1;
        }

        .page-hero {
            position: relative;
            color: #FFFFFF;
            background:
                linear-gradient(115deg, rgba(19, 53, 73, .92) 12%, rgba(36, 106, 140, .82) 58%, rgba(53, 185, 159, .68) 100%),
                url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
            padding: clamp(72px, 9vw, 120px) 0;
            overflow: hidden;
        }

        .breadcrumb-nav {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: rgba(255, 255, 255, .82);
            margin-bottom: 30px;
        }

        .breadcrumb-nav a {
            color: #FFFFFF;
            opacity: .82;
            transition: opacity .2s;
        }

        .breadcrumb-nav a:hover {
            opacity: 1;
        }

        .breadcrumb-nav .crumb-divider {
            opacity: .65;
            color: #B9D6E5;
        }

        .breadcrumb-nav .current-crumb {
            color: #FFFFFF;
            opacity: .95;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr);
            gap: 52px;
            align-items: center;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            background: rgba(255, 255, 255, .14);
            border: 1px solid rgba(255, 255, 255, .18);
            padding: 6px 12px;
            border-radius: 100px;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: .03em;
            margin-bottom: 20px;
            backdrop-filter: blur(6px);
        }

        .hero-badge i {
            color: #6FE3C8;
        }

        .page-hero h1 {
            font-size: clamp(2.1rem, 5vw, 3.4rem);
            line-height: 1.2;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 18px;
            letter-spacing: .01em;
        }

        .hero-lead {
            font-size: 17px;
            line-height: 1.9;
            color: #E6F1F6;
            max-width: 580px;
            margin-bottom: 28px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 28px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            padding: 11px 22px;
            line-height: 1.5;
            border: 1px solid transparent;
            transition: all .2s ease;
            cursor: default;
        }

        .btn:active {
            transform: scale(.98);
        }

        .btn-download {
            background: var(--accent);
            border-color: var(--accent);
            color: #fff;
            box-shadow: 0 10px 18px -10px rgba(53, 185, 159, .5);
        }

        .btn-download:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 14px 22px -12px rgba(53, 185, 159, .45);
        }

        .btn-outline-light-custom {
            background: rgba(255, 255, 255, .08);
            border: 1px solid rgba(255, 255, 255, .45);
            color: #FFFFFF;
        }

        .btn-outline-light-custom:hover {
            background: rgba(255, 255, 255, .16);
            border-color: #FFFFFF;
            color: #FFFFFF;
            transform: translateY(-2px);
        }

        .hero-specs {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 22px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, .18);
            font-size: 14px;
            color: rgba(255, 255, 255, .85);
        }

        .hero-specs i {
            color: #71E7CB;
            margin-right: 6px;
        }

        .hero-visual {
            position: relative;
        }

        .hero-visual .cover-card {
            background: #FFFFFF;
            border-radius: 18px;
            padding: 10px;
            box-shadow: 0 28px 60px -20px rgba(12, 38, 52, .4);
            border: 1px solid rgba(255, 255, 255, .5);
            transform: rotate(1.2deg);
        }

        .hero-visual .cover-card img {
            border-radius: 12px;
            width: 100%;
            aspect-ratio: 4 / 3;
            object-fit: cover;
        }

        .visual-float-badge {
            position: absolute;
            right: -8px;
            top: 40px;
            background: rgba(255, 255, 255, .95);
            color: var(--primary-dark);
            box-shadow: 0 12px 28px -10px rgba(12, 38, 52, .3);
            border-radius: 14px;
            padding: 8px 14px;
            display: flex;
            gap: 8px;
            font-size: 13px;
            font-weight: 600;
            align-items: center;
        }

        .visual-float-badge i {
            color: var(--accent);
        }

        .section-gap {
            padding-top: clamp(72px, 10vw, 110px);
            padding-bottom: clamp(72px, 10vw, 110px);
        }

        .section-head {
            margin-bottom: 48px;
        }

        .section-head .section-kicker {
            display: inline-block;
            color: var(--primary);
            font-size: 14px;
            font-weight: 600;
            letter-spacing: .05em;
            margin-bottom: 10px;
        }

        .section-head h2 {
            font-size: clamp(1.7rem, 3vw, 2.4rem);
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-main);
            letter-spacing: -.01em;
        }

        .section-head p {
            color: var(--text-sub);
            font-size: 16px;
            max-width: 680px;
            margin-top: 14px;
            line-height: 1.8;
        }

        .feature-row {
            display: grid;
            grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
            gap: 52px;
            align-items: center;
        }

        .feature-row+.feature-row {
            margin-top: 88px;
        }

        .feature-img {
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            background: var(--card-bg);
        }

        .feature-img img {
            width: 100%;
            aspect-ratio: 4 / 3;
            object-fit: cover;
            transition: transform .5s ease;
        }

        .feature-img:hover img {
            transform: scale(1.03);
        }

        .feature-copy {
            padding: 8px 0;
        }

        .feature-index {
            font-size: 52px;
            font-weight: 700;
            line-height: 1;
            color: rgba(46, 127, 166, .16);
            display: block;
            margin-bottom: 14px;
            letter-spacing: -.03em;
        }

        .feature-copy h2 {
            font-size: clamp(1.3rem, 2.4vw, 1.65rem);
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-main);
            margin-bottom: 14px;
        }

        .feature-copy p {
            color: var(--text-sub);
            font-size: 15px;
            line-height: 1.9;
            margin-bottom: 18px;
        }

        .feature-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: grid;
            gap: 10px;
        }

        .feature-list li {
            display: flex;
            gap: 10px;
            align-items: flex-start;
            color: var(--text-main);
            font-size: 14px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 10px 14px;
            box-shadow: 0 4px 12px -8px rgba(31, 71, 103, .08);
        }

        .feature-list li i {
            color: var(--accent);
            margin-top: 2px;
        }

        .feature-row.flip .feature-img {
            order: 2;
        }

        .feature-row.flip .feature-copy {
            order: 1;
        }

        .version-panel {
            background: #FFFFFF;
            border-radius: 24px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border);
            display: grid;
            grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
            overflow: hidden;
        }

        .version-intro {
            background: linear-gradient(150deg, #EAF5FA 0%, #DBEEF6 100%);
            padding: clamp(28px, 4vw, 48px);
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .version-intro h2 {
            font-size: clamp(1.4rem, 2.6vw, 1.9rem);
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--primary-deep);
        }

        .version-intro p {
            color: #3A6378;
            line-height: 1.8;
            font-size: 15px;
        }

        .version-stat {
            padding: clamp(28px, 4vw, 48px);
            display: grid;
            grid-template-columns: repeat(2, minmax(0, 1fr));
            gap: 22px 28px;
            align-content: center;
        }

        .version-stat-item {
            border-left: 3px solid var(--border);
            padding-left: 16px;
        }

        .version-stat-item span {
            display: block;
            font-size: 13px;
            color: var(--text-sub);
            margin-bottom: 4px;
        }

        .version-stat-item strong {
            display: block;
            font-size: 17px;
            line-height: 1.5;
            color: var(--text-main);
            font-weight: 600;
        }

        .version-stat-item i {
            color: var(--primary);
            margin-right: 6px;
            font-size: 14px;
        }

        .step-wrap {
            max-width: 860px;
            margin: 0 auto;
        }

        .step-item {
            position: relative;
            padding-left: 66px;
            padding-bottom: 38px;
        }

        .step-item::before {
            content: "";
            position: absolute;
            left: 26px;
            top: 56px;
            bottom: -8px;
            width: 2px;
            background: linear-gradient(#D5E7F0, #EDF5F9);
        }

        .step-item:last-child {
            padding-bottom: 0;
        }

        .step-item:last-child::before {
            display: none;
        }

        .step-number {
            position: absolute;
            left: 0;
            top: 0;
            width: 54px;
            height: 54px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 18px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 10px 18px -10px rgba(46, 127, 166, .6);
        }

        .step-number.ok {
            background: var(--accent);
        }

        .step-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 20px 22px 22px;
            box-shadow: 0 8px 18px -12px rgba(31, 71, 103, .1);
            transition: transform .2s ease, box-shadow .2s ease;
        }

        .step-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }

        .step-card h3 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-main);
        }

        .step-card p {
            font-size: 14px;
            color: var(--text-sub);
            line-height: 1.8;
        }

        .faq-section {
            background: linear-gradient(180deg, #FFFFFF 0%, #F6F9FC 100%);
        }

        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }

        .accordion-item {
            background: transparent;
            border: 0 !important;
            border-bottom: 1px solid var(--border) !important;
        }

        .accordion-button {
            background: transparent;
            color: var(--text-main);
            font-size: 16px;
            font-weight: 600;
            padding: 22px 46px 22px 0;
            box-shadow: none;
            cursor: default;
        }

        .accordion-button:not(.collapsed) {
            background: transparent;
            color: var(--primary-dark);
            box-shadow: none;
        }

        .accordion-button::after {
            background: transparent;
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            content: "\f078";
            color: var(--primary);
            position: absolute;
            right: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: rgba(46, 127, 166, .08);
            font-size: 13px;
            transition: transform .25s ease, background .2s ease;
        }

        .accordion-button:not(.collapsed)::after {
            transform: rotate(180deg);
            background: rgba(46, 127, 166, .14);
        }

        .accordion-body {
            padding: 0 0 24px;
            color: var(--text-sub);
            line-height: 1.9;
            font-size: 14px;
        }

        .accordion-button:hover {
            color: var(--primary-dark);
        }

        .cta-shell {
            position: relative;
            background:
                linear-gradient(115deg, rgba(16, 55, 74, .94), rgba(33, 96, 124, .86)),
                url('/assets/images/backpic/back-3.webp') center / cover;
            border-radius: 24px;
            overflow: hidden;
            padding: clamp(40px, 6vw, 72px) clamp(24px, 5vw, 64px);
            color: #FFFFFF;
            text-align: center;
        }

        .cta-shell .cta-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: #A9E4D7;
            background: rgba(255, 255, 255, .1);
            border: 1px solid rgba(255, 255, 255, .18);
            padding: 7px 14px;
            border-radius: 80px;
            margin-bottom: 18px;
        }

        .cta-shell h2 {
            font-size: clamp(1.7rem, 3.4vw, 2.6rem);
            font-weight: 700;
            color: #FFFFFF;
            line-height: 1.3;
            margin-bottom: 16px;
        }

        .cta-shell p {
            font-size: 16px;
            color: rgba(255, 255, 255, .88);
            max-width: 620px;
            margin: 0 auto 30px;
            line-height: 1.8;
        }

        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 14px;
        }

        .btn-cta-primary {
            background: var(--accent);
            border-color: var(--accent);
            color: #FFF;
            padding: 14px 32px;
            font-size: 16px;
            box-shadow: 0 14px 28px -14px rgba(53, 185, 159, .75);
        }

        .btn-cta-primary:hover {
            background: #2AC9A8;
            border-color: #2AC9A8;
            color: #FFF;
            transform: translateY(-2px);
        }

        .btn-cta-outline {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, .6);
            color: #FFFFFF;
            padding: 14px 26px;
            font-size: 16px;
        }

        .btn-cta-outline:hover {
            background: rgba(255, 255, 255, .12);
            border-color: #FFFFFF;
            color: #FFFFFF;
        }

        .app-footer {
            margin-top: auto;
            background: #FFFFFF;
            border-top: 1px solid var(--border);
            padding: 32px 32px;
        }

        .footer-inner {
            max-width: 1180px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 18px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-brand .brand-icon {
            width: 34px;
            height: 34px;
            font-size: 12px;
            border-radius: 10px;
        }

        .footer-brand-text {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
        }

        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-sub);
        }

        .footer-links {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .footer-links a {
            color: var(--text-main);
            font-weight: 500;
        }

        .footer-links a:hover {
            color: var(--primary);
        }

        .footer-links span {
            color: #BFD1DC;
        }

        .footer-domain {
            font-size: 12px;
            color: #A5B8C5;
            margin-left: 4px;
        }

        @media (max-width: 1199.98px) {
            .hero-grid {
                gap: 36px;
            }

            .feature-row {
                gap: 34px;
            }
        }

        @media (max-width: 991.98px) {
            .mobile-topbar {
                display: flex;
                align-items: center;
                justify-content: space-between;
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                height: 60px;
                background: rgba(255, 255, 255, .96);
                border-bottom: 1px solid var(--border);
                padding: 0 18px;
                z-index: 1060;
                box-shadow: 0 4px 16px -10px rgba(31, 71, 103, .12);
                backdrop-filter: blur(8px);
            }

            .mobile-brand-ref {
                display: flex;
                align-items: center;
                gap: 8px;
                font-weight: 700;
                color: var(--text-main);
                font-size: 16px;
            }

            .mobile-brand-ref i {
                color: var(--primary);
            }

            .burger-btn {
                width: 44px;
                height: 44px;
                border: 0;
                border-radius: 12px;
                background: rgba(46, 127, 166, .08);
                color: var(--primary-dark);
                font-size: 18px;
                display: flex;
                align-items: center;
                justify-content: center;
            }

            .burger-btn:hover {
                background: rgba(46, 127, 166, .14);
            }

            .main-content {
                margin-left: 0;
                padding-top: 60px;
            }

            .app-sidebar {
                transform: translateX(-104%);
                box-shadow: 18px 0 45px -20px rgba(20, 45, 65, .22);
                width: min(305px, 86vw);
            }

            body.nav-open .app-sidebar {
                transform: translateX(0);
            }

            .nav-backdrop {
                position: fixed;
                inset: 0 0 0 0;
                background: rgba(24, 48, 62, .44);
                z-index: 1050;
                display: none;
                opacity: 0;
                transition: opacity .25s ease;
            }

            body.nav-open .nav-backdrop {
                display: block;
                opacity: 1;
            }

            .hero-grid {
                grid-template-columns: 1fr;
                gap: 42px;
            }

            .hero-visual {
                max-width: 520px;
                margin: 0 auto;
                width: 100%;
            }

            .feature-row {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .feature-row.flip .feature-img {
                order: 1;
            }

            .feature-row.flip .feature-copy {
                order: 2;
            }

            .feature-img img {
                aspect-ratio: 16 / 10;
            }

            .version-panel {
                grid-template-columns: 1fr;
            }

            .version-intro {
                padding: 30px 26px;
            }

            .version-stat {
                padding: 12px 26px 30px;
            }

            .app-footer {
                padding: 28px 20px;
            }

            .footer-inner {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 575.98px) {
            .container-page {
                padding-left: 18px;
                padding-right: 18px;
            }

            .hero-actions {
                gap: 10px;
            }

            .hero-actions .btn {
                padding: 10px 18px;
                font-size: 14px;
            }

            .hero-specs {
                gap: 8px 16px;
                font-size: 13px;
            }

            .hero-specs span {
                width: 100%;
            }

            .section-gap {
                padding-top: 64px;
                padding-bottom: 64px;
            }

            .section-head {
                margin-bottom: 36px;
            }

            .feature-index {
                font-size: 44px;
            }

            .feature-copy p {
                font-size: 14px;
            }

            .version-stat {
                grid-template-columns: 1fr;
                gap: 18px;
            }

            .step-item {
                padding-left: 0;
                padding-top: 72px;
            }

            .step-item::before {
                left: 26px;
                top: 0;
                bottom: auto;
                height: 58px;
                width: 2px;
            }

            .step-item:last-child::before {
                display: block;
                height: 0;
            }

            .step-number {
                top: 0;
                left: 0;
                width: 52px;
                height: 52px;
            }

            .step-card {
                padding: 18px;
            }

            .accordion-button {
                font-size: 15px;
                padding-right: 48px;
            }

            .cta-shell h2 {
                font-size: 1.5rem;
            }

            .cta-actions .btn {
                width: 100%;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

/* roulang page: category2 */
:root {
    --primary: #2E7FA6;
    --primary-dark: #246A8C;
    --primary-light: #EAF3F8;
    --accent: #35B99F;
    --amber: #F4A936;
    --bg: #F6F9FC;
    --surface: #FFFFFF;
    --text: #213544;
    --muted: #607488;
    --border: #E2EDF4;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 10px 24px -12px rgba(31, 71, 103, .12);
    --shadow-hover: 0 18px 34px -16px rgba(46, 127, 166, .2);
}

html {
    scroll-behavior: smooth;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
}

button,
input,
select,
textarea {
    font-family: inherit;
}

p {
    margin-bottom: 0;
    color: #40566a;
}

h1,
h2,
h3,
h4 {
    color: var(--text);
    font-weight: 700;
}

.container,
.container-fluid {
    padding-left: 20px;
    padding-right: 20px;
}

.row {
    margin-left: -12px;
    margin-right: -12px;
}

.row>* {
    padding-left: 12px;
    padding-right: 12px;
}

.btn {
    border-radius: var(--radius-sm);
    padding: .72rem 1.35rem;
    font-weight: 600;
    transition: all .2s ease;
    border: 1px solid transparent;
    font-size: 1rem;
}

.btn-lg {
    padding: .85rem 1.6rem;
    font-size: 1.04rem;
    border-radius: 12px;
}

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 6px 14px -8px rgba(46, 127, 166, .55);
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active,
.btn-primary.active {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
    box-shadow: 0 10px 18px -10px rgba(36, 106, 140, .4);
}

.btn-outline-primary {
    border-color: rgba(46, 127, 166, .45);
    color: var(--primary);
    background: transparent;
}

.btn-outline-primary:hover,
.btn-outline-primary:focus,
.btn-outline-primary:active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 10px 18px -10px rgba(36, 106, 140, .35);
}

.btn-outline-light {
    border: 1px solid rgba(255, 255, 255, .7);
    color: #fff;
    background: transparent;
}

.btn-outline-light:hover,
.btn-outline-light:focus,
.btn-outline-light:active {
    background: #fff;
    color: var(--primary-dark);
    border-color: #fff;
}

.btn-accent {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.btn-accent:hover {
    background: #2aa88e;
    border-color: #2aa88e;
    color: #fff;
}

.mobile-topbar {
    display: none;
    background: #fff;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 3px 12px rgba(31, 71, 103, .04);
    height: 60px;
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1030;
}

.mobile-topbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.mobile-brand {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
}

.mobile-brand .brand-icon {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
}

.topbar-toggle {
    width: 42px;
    height: 42px;
    border: 0;
    border-radius: 10px;
    background: var(--primary-light);
    color: var(--primary-dark);
    font-size: 1.2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all .2s;
}

.topbar-toggle:hover {
    background: var(--primary);
    color: #fff;
}

.app-sidebar {
    width: 240px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    padding: 22px 16px 18px;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 1050;
    box-shadow: none;
}

.brand-area {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 4px 4px 24px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 18px;
}

.brand-icon {
    width: 40px;
    height: 40px;
    flex: 0 0 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    box-shadow: 0 6px 14px -8px rgba(46, 127, 166, .55);
}

.brand-text {
    color: var(--text);
    font-size: 1.05rem;
    font-weight: 700;
}

.nav-caption {
    font-size: .75rem;
    color: #96a7b6;
    letter-spacing: .08em;
    padding: 0 12px 8px;
}

.nav-link-shell {
    display: flex;
    align-items: center;
    gap: 11px;
    width: 100%;
    padding: 11px 14px;
    border-radius: 12px;
    margin-bottom: 4px;
    font-size: .96rem;
    color: var(--muted);
    font-weight: 500;
    border-left: 3px solid transparent;
    transition: all .2s ease;
}

.nav-link-shell:hover {
    background: #f0f6fa;
    color: var(--primary-dark);
}

.nav-link-shell.active {
    background: var(--primary-light);
    color: var(--primary-dark);
    border-left-color: var(--primary);
    font-weight: 600;
}

.nav-link-shell i {
    width: 20px;
    text-align: center;
    font-size: 1.05rem;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 22px;
    border-top: 1px solid var(--border);
}

.btn-sidebar-download {
    width: 100%;
}

.sidebar-note {
    text-align: center;
    color: #8ca0b0;
    font-size: .75rem;
    margin-top: 12px;
}

.sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(17, 36, 50, .4);
    z-index: 1045;
    opacity: 0;
    visibility: hidden;
    transition: all .3s ease;
    display: none;
}

.app-main {
    margin-left: 240px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-main main {
    flex: 1;
}

.page-hero {
    color: #fff;
    background: linear-gradient(96deg, rgba(26, 80, 112, .93), rgba(31, 104, 145, .82)), url('/assets/images/backpic/back-1.webp') center / cover no-repeat;
    padding: 76px 24px 74px;
    position: relative;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
}

.hero-breadcrumb {
    display: flex;
    gap: 10px;
    font-size: .86rem;
    color: rgba(255, 255, 255, .78);
    margin-bottom: 28px;
}

.hero-breadcrumb a {
    color: rgba(255, 255, 255, .7);
    transition: color .2s;
    text-decoration: none;
}

.hero-breadcrumb a:hover {
    color: #fff;
}

.page-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}

.hero-lead {
    font-size: 1.08rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, .86);
    max-width: 720px;
    margin-bottom: 30px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 26px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.hero-tags span {
    background: rgba(255, 255, 255, .12);
    border: 1px solid rgba(255, 255, 255, .24);
    color: rgba(255, 255, 255, .9);
    padding: 5px 13px;
    border-radius: 30px;
    font-size: .8rem;
    backdrop-filter: none;
}

.page-body {
    max-width: 1200px;
    margin: 0 auto;
    padding: 48px 24px 20px;
    width: 100%;
}

.section-block {
    padding: 22px 0 44px;
}

.section-eyebrow {
    display: inline-block;
    font-size: .8rem;
    letter-spacing: .08em;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 10px;
}

.section-head {
    max-width: 800px;
    margin-bottom: 38px;
}

.section-head h2 {
    font-size: clamp(1.55rem, 2.6vw, 2rem);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.section-head p {
    color: var(--muted);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 0;
}

.intro-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 42px 38px;
}

.intro-lead {
    font-size: 1.12rem;
    line-height: 1.9;
    color: var(--text);
    max-width: 920px;
    margin: 0 auto 30px;
    text-align: center;
}

.intro-features {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
}

.intro-feature-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #f3f9fc;
    border: 1px solid #e3eef5;
    padding: 8px 16px;
    border-radius: 40px;
    font-size: .9rem;
    color: var(--text);
}

.intro-feature-item i {
    color: var(--accent);
}

.feature-split {
    padding: 62px 0 12px;
}

.feature-row {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 22px;
    box-shadow: var(--shadow);
    overflow: hidden;
    margin-bottom: 26px;
}

.feature-image {
    min-height: 260px;
    background: #edf5fa;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: 0;
}

.feature-copy {
    padding: 46px 48px;
}

.feature-copy h3 {
    color: var(--text);
    font-size: 1.4rem;
    margin-bottom: 14px;
}

.feature-copy p {
    color: var(--muted);
    line-height: 1.85;
    margin-bottom: 22px;
}

.check-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.check-list li {
    display: flex;
    flex-direction: row;
    gap: 11px;
    align-items: flex-start;
    color: var(--text);
    padding: 9px 0;
    font-size: .97rem;
}

.check-list li i {
    color: var(--accent);
    margin-top: 3px;
    width: 18px;
    text-align: center;
}

.install-section {
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 66px calc(24px) 58px;
    margin-left: -24px;
    margin-right: -24px;
}

.install-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.step-timeline {
    list-style: none;
    padding: 0;
    margin: 20px auto 0;
    position: relative;
    max-width: 960px;
}

.step-timeline::before {
    content: "";
    position: absolute;
    left: 22px;
    top: 20px;
    bottom: 20px;
    width: 2px;
    background: #dcf0f8;
}

.step-item {
    position: relative;
    padding-left: 68px;
    margin-bottom: 30px;
}

.step-num {
    position: absolute;
    left: 0;
    top: 0;
    width: 46px;
    height: 46px;
    background: var(--primary);
    color: #fff;
    border-radius: 50%;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .98rem;
    box-shadow: 0 8px 18px -8px rgba(46, 127, 166, .65);
    z-index: 1;
}

.step-card {
    border: 1px solid var(--border);
    border-radius: 16px;
    background: #fff;
    padding: 22px 26px;
    box-shadow: var(--shadow);
}

.step-card h3 {
    font-size: 1.14rem;
    margin-bottom: 8px;
    color: var(--text);
}

.step-card p {
    color: var(--muted);
    font-size: .96rem;
    margin-bottom: 0;
    line-height: 1.8;
}

.compat-section {
    padding: 48px 0 8px;
}

.compat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    box-shadow: var(--shadow);
    padding: 32px 30px;
    height: 100%;
    transition: all .25s ease;
}

.compat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.compat-icon {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    margin-bottom: 18px;
}

.compat-card h3 {
    font-size: 1.18rem;
    margin-bottom: 10px;
}

.compat-card p {
    color: var(--muted);
    margin-bottom: 14px;
}

.compat-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.compat-card ul li {
    padding: 7px 0;
    color: var(--text);
    border-bottom: 1px dashed #edf3f8;
    display: flex;
    gap: 10px;
    font-size: .95rem;
}

.compat-card ul li:last-child {
    border-bottom: 0;
}

.compat-card ul li i {
    color: var(--accent);
    margin-top: 4px;
}

.faq-section {
    padding: 58px 0 10px;
}

.faq-accordion {
    max-width: 980px;
    margin: 0 auto;
}

.faq-accordion .accordion-item {
    background: transparent;
    border: 0;
    border-bottom: 1px solid var(--border);
}

.faq-accordion .accordion-item:first-child {
    border-top: 1px solid var(--border);
}

.faq-accordion .accordion-button {
    background: transparent;
    color: var(--text);
    font-weight: 600;
    font-size: 1.02rem;
    padding: 1.2rem 0.25rem;
    box-shadow: none;
    border: 0;
    border-radius: 0 !important;
    display: flex;
    align-items: center;
    gap: 10px;
}

.faq-accordion .accordion-button::after {
    background: none;
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    content: "\f078";
    color: var(--primary);
    font-size: .85rem;
    width: 20px;
    height: 20px;
    line-height: 20px;
    transition: all .2s;
}

.faq-accordion .accordion-button:not(.collapsed) {
    background: transparent;
    color: var(--primary-dark);
    box-shadow: none;
}

.faq-accordion .accordion-button:not(.collapsed)::after {
    transform: rotate(180deg);
    color: var(--primary);
}

.faq-accordion .accordion-button:focus {
    box-shadow: none;
    outline: none;
}

.faq-accordion .accordion-body {
    padding: 0 0.5rem 22px;
    color: var(--muted);
    border: 0;
    background: transparent;
}

.faq-accordion .accordion-body p {
    color: var(--muted);
    margin-bottom: 0;
}

.cta-outer {
    padding: 66px 24px 58px;
}

.cta-box {
    max-width: 1200px;
    margin: 0 auto;
    background: linear-gradient(135deg, #f3fafd, #e6f1f8);
    border-radius: 28px;
    padding: 58px 40px 52px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-label {
    display: inline-block;
    font-size: .8rem;
    color: var(--accent);
    font-weight: 700;
    letter-spacing: .1em;
    margin-bottom: 14px;
}

.cta-box h2 {
    font-size: clamp(1.7rem, 3vw, 2.2rem);
    color: var(--text);
    margin-bottom: 16px;
}

.cta-box p {
    color: var(--muted);
    max-width: 680px;
    margin: 0 auto;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 32px;
}

.cta-buttons .btn {
    min-width: 168px;
}

.cta-note {
    font-size: .82rem;
    color: #8399aa;
    margin-top: 20px;
}

.app-footer {
    background: #fff;
    border-top: 1px solid var(--border);
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 36px 24px 30px;
    width: 100%;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 22px;
    color: var(--text);
}

.footer-brand .brand-icon {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    font-size: .85rem;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-brand-text {
    font-size: 1.05rem;
    font-weight: 700;
}

.footer-bottom {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    font-size: .86rem;
    color: var(--muted);
    justify-content: space-between;
    border-top: 1px solid var(--border);
    padding-top: 22px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.footer-links a {
    color: var(--muted);
    text-decoration: none;
    transition: color .2s;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-links span {
    color: #c8d8e2;
}

.footer-domain {
    color: #8da3b3;
}

@media (max-width: 991.98px) {
    .app-main {
        margin-left: 0;
    }

    .mobile-topbar {
        display: block;
    }

    .app-sidebar {
        transform: translateX(-105%);
        transition: transform .3s ease;
        box-shadow: 0 0 40px rgba(22, 56, 82, .15);
        width: 270px;
        z-index: 1060;
    }

    body.menu-open .app-sidebar {
        transform: translateX(0);
    }

    .sidebar-backdrop {
        display: block;
    }

    body.menu-open .sidebar-backdrop {
        opacity: 1;
        visibility: visible;
    }

    .page-body {
        padding: 34px 20px 10px;
    }

    .install-section {
        padding-left: 20px;
        padding-right: 20px;
        margin-left: -20px;
        margin-right: -20px;
    }

    .feature-image {
        min-height: 220px;
    }
}

@media (max-width: 767.98px) {
    .page-hero {
        padding: 58px 20px 56px;
    }

    .hero-container h1 {
        font-size: 1.85rem;
    }

    .hero-lead {
        font-size: 1rem;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .intro-panel {
        padding: 32px 24px;
    }

    .intro-lead {
        font-size: 1rem;
        text-align: left;
    }

    .intro-features {
        justify-content: flex-start;
    }

    .feature-copy {
        padding: 32px 26px 34px;
    }

    .feature-copy h3 {
        font-size: 1.22rem;
    }

    .feature-split {
        padding-top: 44px;
    }

    .step-timeline::before {
        left: 18px;
    }

    .step-item {
        padding-left: 58px;
    }

    .step-num {
        width: 40px;
        height: 40px;
        font-size: .9rem;
    }

    .step-card {
        padding: 18px 20px;
    }

    .compat-section {
        padding-top: 34px;
    }

    .cta-outer {
        padding: 50px 20px 40px;
    }

    .cta-box {
        border-radius: 22px;
        padding: 42px 22px;
    }

    .cta-buttons .btn {
        width: 100%;
        min-width: 0;
    }

    .cta-box p {
        font-size: .96rem;
    }

    .footer-inner {
        padding: 30px 20px 24px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
        padding-top: 20px;
    }

    .footer-links {
        justify-content: center;
    }
}

@media (max-width: 520px) {
    .hero-tags span {
        font-size: .75rem;
    }

    .intro-feature-item {
        width: 100%;
    }

    .page-body {
        padding-left: 16px;
        padding-right: 16px;
    }

    .feature-image img {
        min-height: 220px;
    }

    .compat-card {
        padding: 26px 22px;
    }

    .faq-accordion .accordion-button {
        font-size: .98rem;
    }

    .cta-box h2 {
        font-size: 1.4rem;
    }

    .cta-note {
        font-size: .78rem;
    }

    .footer-links span {
        display: none;
    }

    .footer-links {
        flex-direction: column;
        gap: 8px;
    }
}

/* roulang page: category3 */
:root {
            --primary: #2E7FA6;
            --primary-dark: #246A8C;
            --aqua: #35B99F;
            --amber: #F4A936;
            --bg: #F6F9FC;
            --surface: #FFFFFF;
            --text: #213544;
            --muted: #607488;
            --line: #E2EDF4;
            --radius-lg: 20px;
            --radius-md: 16px;
            --radius-btn: 12px;
            --shadow-card: 0 10px 24px -12px rgba(31, 71, 103, .12);
            --shadow-hover: 0 18px 34px -16px rgba(46, 127, 166, .22);
            --shadow-btn: 0 10px 18px -10px rgba(36, 106, 140, .4);
            --transition: .25s ease;
            --gradient: linear-gradient(135deg, #2E7FA6 0%, #2A6D93 100%);
        }
        html {
            scroll-behavior: smooth;
        }
        *, *::before, *::after {
            box-sizing: border-box;
        }
        body {
            margin: 0;
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color .2s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease;
        }
        button {
            font-family: inherit;
        }
        h1, h2, h3, h4, h5, p, ul {
            margin: 0;
            padding: 0;
        }
        ul {
            list-style: none;
        }
        .container-page {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .page-section {
            padding: 88px 0;
        }
        .section-eyebrow {
            display: inline-block;
            color: var(--primary);
            font-weight: 700;
            font-size: .85rem;
            letter-spacing: .08em;
            margin-bottom: 6px;
        }
        .section-title {
            font-size: clamp(1.75rem, 3vw, 2.4rem);
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -.01em;
            color: var(--text);
        }
        .section-desc {
            font-size: 1.02rem;
            color: var(--muted);
            margin-top: 14px;
            max-width: 680px;
            line-height: 1.8;
        }
        .text-mute {
            color: var(--muted);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .55rem;
            font-weight: 600;
            border-radius: var(--radius-btn);
            border: 1px solid transparent;
            padding: .72rem 1.5rem;
            line-height: 1.5;
            transition: transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease, color .25s ease;
            white-space: nowrap;
        }
        .btn-lg {
            padding: .9rem 1.8rem;
            font-size: 1.05rem;
        }
        .btn-primary {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }
        .btn-primary:hover, .btn-primary:focus {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-btn);
        }
        .btn-aqua {
            background: var(--aqua);
            border-color: var(--aqua);
            color: #fff;
        }
        .btn-aqua:hover {
            background: #2EA98F;
            border-color: #2EA98F;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 10px 18px -10px rgba(53, 185, 159, .45);
        }
        .btn-outline-light {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, .9);
            color: #fff;
        }
        .btn-outline-light:hover {
            background: #fff;
            color: var(--primary);
            border-color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 12px 24px -12px rgba(0, 0, 0, .4);
        }
        .btn-ghost {
            background: transparent;
            border: 1px solid rgba(46, 127, 166, .45);
            color: var(--primary);
        }
        .btn-ghost:hover {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-btn);
        }
        .btn-block {
            width: 100%;
            display: flex;
        }
        .btn:focus-visible {
            outline: 3px solid rgba(46, 127, 166, .35);
            outline-offset: 2px;
        }

        /* ===== App shell / sidebar ===== */
        .mobile-topbar {
            display: none;
        }
        .app-sidebar {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1060;
            width: 240px;
            background: var(--surface);
            border-right: 1px solid var(--line);
            overflow-y: auto;
            overflow-x: hidden;
            transition: transform .3s ease;
        }
        .sidebar-scroll {
            display: flex;
            flex-direction: column;
            min-height: 100%;
            padding-top: 20px;
            padding-bottom: 20px;
        }
        .brand-block {
            padding: 0 24px 20px;
            border-bottom: 1px solid #EFF4F8;
        }
        .brand-link {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .brand-logo {
            flex: 0 0 42px;
            width: 42px;
            height: 42px;
            border-radius: 13px;
            background: var(--gradient);
            color: #fff;
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 10px 18px -8px rgba(46, 127, 166, .4);
        }
        .brand-copy {
            display: flex;
            flex-direction: column;
            line-height: 1.2;
        }
        .brand-copy strong {
            font-size: 1.15rem;
            font-weight: 800;
            letter-spacing: .01em;
            color: var(--text);
        }
        .brand-copy em {
            font-style: normal;
            font-size: .72rem;
            font-weight: 500;
            color: var(--muted);
            letter-spacing: .12em;
        }
        .app-sidebar nav {
            padding-top: 16px;
        }
        .nav-caption {
            font-size: .75rem;
            font-weight: 600;
            letter-spacing: .1em;
            color: #8FA5B4;
            padding: 0 24px;
            margin-bottom: 8px;
        }
        .nav-link-shell {
            position: relative;
            display: flex;
            align-items: center;
            gap: 12px;
            color: var(--text);
            font-size: .95rem;
            font-weight: 500;
            padding: 11px 24px;
        }
        .nav-link-shell i {
            width: 22px;
            text-align: center;
            font-size: 1.02rem;
            color: #8197A6;
            transition: color .2s;
        }
        .nav-link-shell:hover {
            background: #F2F8FB;
            color: var(--primary-dark);
        }
        .nav-link-shell:hover i {
            color: var(--primary);
        }
        .nav-link-shell.active {
            background: #EDF6FA;
            color: var(--primary);
            font-weight: 700;
        }
        .nav-link-shell.active::before {
            content: "";
            position: absolute;
            left: 0;
            top: 9px;
            bottom: 9px;
            width: 4px;
            border-radius: 0 4px 4px 0;
            background: var(--primary);
        }
        .nav-link-shell.active i {
            color: var(--primary);
        }
        .sidebar-download {
            margin-top: auto;
            padding: 28px 20px 6px;
        }
        .sidebar-tip {
            margin-top: 12px;
            text-align: center;
            font-size: .75rem;
            color: var(--muted);
            line-height: 1.6;
        }
        .sidebar-backdrop {
            display: none;
        }

        /* ===== Main layout ===== */
        .app-main {
            margin-left: 240px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .app-main > section,
        .app-main > .page-section {
            flex-shrink: 0;
        }

        /* ===== Hero banner ===== */
        .pc-hero {
            position: relative;
            color: #fff;
            background-image: linear-gradient(80deg, rgba(22, 60, 82, .94) 0%, rgba(46, 127, 166, .82) 55%, rgba(53, 185, 159, .66) 100%), url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            overflow: hidden;
        }
        .pc-hero-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 108px 24px 100px;
            width: 100%;
            position: relative;
            z-index: 2;
        }
        .hero-breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px;
            font-size: .9rem;
            color: rgba(255, 255, 255, .85);
            margin-bottom: 18px;
        }
        .hero-breadcrumb a {
            color: rgba(255, 255, 255, .85);
        }
        .hero-breadcrumb a:hover {
            color: #fff;
            text-decoration: underline;
        }
        .hero-breadcrumb .crumb-arrow {
            font-size: .75rem;
        }
        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(19, 52, 72, .34);
            border: 1px solid rgba(255, 255, 255, .3);
            border-radius: 999px;
            padding: 6px 14px 6px 12px;
            font-size: .84rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }
        .hero-tag i {
            color: var(--aqua);
        }
        .pc-hero h1 {
            font-size: clamp(2.3rem, 5vw, 3.4rem);
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -.01em;
            margin-bottom: 18px;
            color: #fff;
        }
        .pc-hero .hero-lead {
            font-size: 1.14rem;
            line-height: 1.85;
            color: rgba(255, 255, 255, .9);
            max-width: 660px;
        }
        .hero-btns {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-top: 34px;
        }
        .hero-note {
            margin-top: 22px;
            font-size: .85rem;
            color: rgba(255, 255, 255, .76);
            max-width: 680px;
        }

        /* ===== Feature area ===== */
        .feature-wrap {
            padding: 96px 0 86px;
        }
        .feature-heading {
            margin-bottom: 60px;
        }
        .feature-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
            margin-bottom: 76px;
        }
        .feature-row:last-child {
            margin-bottom: 0;
        }
        .feature-row .feature-media {
            grid-column: 2;
            grid-row: 1;
        }
        .feature-row .feature-copy {
            grid-column: 1;
            grid-row: 1;
        }
        .feature-row:nth-child(even) .feature-media {
            grid-column: 1;
        }
        .feature-row:nth-child(even) .feature-copy {
            grid-column: 2;
        }
        .feature-media {
            position: relative;
            border-radius: 24px;
            overflow: hidden;
            box-shadow: var(--shadow-hover);
            background: #E4EDF3;
        }
        .feature-media img {
            width: 100%;
            height: 360px;
            object-fit: cover;
        }
        .media-float-tag {
            position: absolute;
            left: 16px;
            bottom: 16px;
            background: rgba(255, 255, 255, .94);
            backdrop-filter: blur(6px);
            border-radius: 12px;
            padding: 8px 14px;
            font-size: .82rem;
            font-weight: 700;
            color: var(--primary);
            box-shadow: 0 8px 20px -10px rgba(15, 30, 45, .4);
        }
        .feature-copy .step-number {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1;
            color: transparent;
            -webkit-text-stroke: 1.6px var(--primary);
            opacity: .75;
        }
        .feature-copy h3 {
            font-size: 1.45rem;
            font-weight: 700;
            line-height: 1.4;
            margin-top: 12px;
            margin-bottom: 12px;
        }
        .feature-copy p {
            color: var(--muted);
            line-height: 1.85;
            font-size: 1rem;
        }

        /* ===== Scene section ===== */
        .scene-section {
            background: #EDF5F9;
            padding: 96px 0;
            border-top: 1px solid #DCEDF4;
            border-bottom: 1px solid #DCEDF4;
        }
        .scene-section .section-title {
            margin-bottom: 48px;
            max-width: 520px;
        }
        .scene-card {
            position: relative;
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            height: 100%;
            padding: 28px 24px;
            transition: transform .25s ease, box-shadow .25s ease;
        }
        .scene-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        .scene-icon {
            width: 52px;
            height: 52px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.35rem;
            color: var(--primary);
            background: #E9F3F8;
            border-radius: 16px;
            margin-bottom: 18px;
        }
        .scene-card h3 {
            font-size: 1.18rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .scene-card p {
            color: var(--muted);
            font-size: .95rem;
            line-height: 1.7;
        }

        /* ===== Spec section ===== */
        .spec-section {
            background: var(--surface);
        }
        .spec-title {
            margin-bottom: 44px;
        }
        .spec-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            height: 100%;
            overflow: hidden;
            transition: transform .25s ease, box-shadow .25s ease;
        }
        .spec-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .spec-head {
            padding: 24px 26px;
            border-bottom: 1px solid var(--line);
            display: flex;
            align-items: center;
            gap: 14px;
        }
        .spec-head .icon-shell {
            width: 46px;
            height: 46px;
            border-radius: 14px;
            background: #E9F3F8;
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
        }
        .spec-head h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin: 0;
        }
        .spec-head small {
            display: block;
            color: var(--muted);
            font-size: .8rem;
            font-weight: 400;
            margin-top: 2px;
        }
        .spec-body {
            padding: 18px 26px 22px;
        }
        .spec-list li {
            display: flex;
            justify-content: space-between;
            gap: 20px;
            padding: 12px 0;
            border-bottom: 1px dashed #E8F0F4;
            font-size: .95rem;
        }
        .spec-list li:last-child {
            border-bottom: 0;
        }
        .spec-list .spec-label {
            flex: 0 0 92px;
            color: var(--muted);
            font-size: .86rem;
        }
        .spec-list .spec-value {
            text-align: right;
            font-weight: 600;
            color: var(--text);
        }
        .spec-tip {
            background: #F2F9FB;
            border-left: 4px solid var(--aqua);
            border-radius: 0 14px 14px 0;
            padding: 18px 22px;
            max-width: 820px;
            margin-top: 40px;
            font-size: .95rem;
            color: var(--muted);
            line-height: 1.8;
        }

        /* ===== Steps ===== */
        .steps-section {
            background: var(--bg);
        }
        .steps-title {
            margin-bottom: 48px;
        }
        .step-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .step-card {
            background: var(--surface);
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            height: 100%;
            box-shadow: var(--shadow-card);
            transition: transform .25s ease, box-shadow .25s ease;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .step-num {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: #EAF3F8;
            color: var(--primary);
            font-size: 1.15rem;
            font-weight: 800;
            margin-bottom: 20px;
        }
        .step-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-card p {
            color: var(--muted);
            font-size: .94rem;
            line-height: 1.75;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--surface);
        }
        .faq-head {
            max-width: 520px;
            margin-bottom: 40px;
        }
        .faq-wrap {
            max-width: 860px;
        }
        .accordion-item {
            background: transparent;
            border: 0;
            border-top: 1px solid var(--line);
            border-radius: 0 !important;
        }
        .accordion-item:last-child {
            border-bottom: 1px solid var(--line);
        }
        .accordion-button {
            background: transparent;
            box-shadow: none;
            font-weight: 600;
            font-size: 1.02rem;
            color: var(--text);
            padding: 22px 44px 22px 2px;
            border-radius: 0 !important;
            transition: color .2s;
        }
        .accordion-button::after {
            content: "\f107";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            background: none;
            width: 24px;
            height: 24px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: var(--primary);
            position: absolute;
            right: 2px;
            top: 50%;
            transform: translateY(-50%);
            transition: transform .25s;
        }
        .accordion-button:not(.collapsed) {
            background: transparent;
            box-shadow: none;
            color: var(--primary);
        }
        .accordion-button:not(.collapsed)::after {
            transform: translateY(-50%) rotate(180deg);
        }
        .accordion-button:hover {
            color: var(--primary);
        }
        .accordion-button:focus {
            box-shadow: none;
            border: 0;
            outline: 2px solid rgba(46, 127, 166, .18);
        }
        .accordion-body {
            color: var(--muted);
            line-height: 1.85;
            padding: 4px 42px 24px 2px;
            font-size: .97rem;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #F3FAFD 0%, #E7F1F7 100%);
            border-top: 1px solid #DCEBF2;
            padding: 90px 0;
        }
        .cta-panel {
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }
        .cta-panel h2 {
            font-size: clamp(1.7rem, 3vw, 2.3rem);
            font-weight: 800;
            line-height: 1.25;
            color: var(--text);
        }
        .cta-panel p {
            color: var(--muted);
            font-size: 1.05rem;
            margin: 18px auto 34px;
            max-width: 650px;
            line-height: 1.85;
        }
        .cta-buttons {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 14px;
        }
        .cta-safe {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            margin-top: 24px;
            color: var(--aqua);
            font-size: .9rem;
            font-weight: 600;
        }

        /* ===== Footer ===== */
        .app-footer {
            background: var(--surface);
            border-top: 1px solid var(--line);
            margin-top: auto;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 34px 24px;
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 18px 30px;
            justify-content: space-between;
        }
        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .footer-brand .brand-icon {
            width: 36px;
            height: 36px;
            background: var(--gradient);
            color: #fff;
            border-radius: 11px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: .88rem;
        }
        .footer-brand-text {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text);
        }
        .footer-bottom {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px 14px;
            color: var(--muted);
            font-size: .84rem;
        }
        .footer-bottom a {
            color: var(--muted);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }
        .footer-domain {
            color: #8BA3B5;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1199.98px) {
            .feature-media img {
                height: 320px;
            }
        }
        @media (max-width: 991.98px) {
            .mobile-topbar {
                display: flex;
                align-items: center;
                justify-content: space-between;
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                z-index: 1080;
                height: 64px;
                background: #fff;
                border-bottom: 1px solid var(--line);
                box-shadow: 0 2px 12px -8px rgba(46, 127, 166, .15);
                padding: 0 18px;
            }
            .mobile-topbar .mobile-brand {
                font-size: 1.18rem;
                font-weight: 800;
                color: var(--text);
                display: flex;
                align-items: baseline;
                gap: 4px;
            }
            .mobile-topbar .mobile-brand small {
                font-size: .72rem;
                color: var(--muted);
                font-weight: 500;
                letter-spacing: .1em;
            }
            .menu-toggle {
                width: 44px;
                height: 44px;
                border: 0;
                background: #EFF6F9;
                color: var(--primary);
                border-radius: 12px;
                display: inline-flex;
                align-items: center;
                justify-content: center;
                font-size: 1.15rem;
                transition: background .2s;
            }
            .menu-toggle:hover {
                background: #E0EFF5;
            }
            .app-sidebar {
                transform: translateX(-102%);
                width: 280px;
                box-shadow: 12px 0 36px -12px rgba(15, 35, 48, .18);
                border-right: 0;
            }
            .app-sidebar.open {
                transform: translateX(0);
            }
            .sidebar-backdrop.open {
                display: block;
                position: fixed;
                inset: 0;
                z-index: 1050;
                background: rgba(12, 33, 48, .48);
                backdrop-filter: blur(2px);
            }
            .app-main {
                margin-left: 0;
                padding-top: 64px;
            }
            .pc-hero-inner {
                padding: 86px 24px 80px;
            }
            .feature-wrap {
                padding: 76px 0 66px;
            }
            .feature-row {
                grid-template-columns: 1fr;
                gap: 28px;
                margin-bottom: 60px;
            }
            .feature-row .feature-media,
            .feature-row:nth-child(even) .feature-media {
                grid-column: 1;
                grid-row: auto;
            }
            .feature-row .feature-copy,
            .feature-row:nth-child(even) .feature-copy {
                grid-column: 1;
                grid-row: auto;
            }
            .feature-media img {
                height: auto;
                max-height: 360px;
            }
            .step-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 767.98px) {
            .container-page {
                padding-left: 16px;
                padding-right: 16px;
            }
            .page-section {
                padding: 64px 0;
            }
            .pc-hero-inner {
                padding: 64px 20px 60px;
            }
            .pc-hero h1 {
                font-size: 2rem;
            }
            .hero-btns .btn {
                width: 100%;
            }
            .scene-section {
                padding: 64px 0;
            }
            .spec-card {
                margin-bottom: 20px;
            }
            .step-grid {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                padding: 28px 18px;
                flex-direction: column;
                align-items: flex-start;
                gap: 16px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }
            .cta-buttons .btn {
                width: 100%;
            }
            .accordion-button {
                font-size: .97rem;
                padding-right: 36px;
            }
            .section-desc {
                font-size: .95rem;
            }
        }
        @media (max-width: 480px) {
            .feature-media img {
                max-height: 250px;
            }
            .feature-copy h3 {
                font-size: 1.3rem;
            }
            .spec-list li {
                flex-direction: column;
                gap: 4px;
            }
            .spec-list .spec-value {
                text-align: left;
            }
            .hero-btns {
                flex-direction: column;
                align-items: stretch;
            }
        }