/* roulang page: index */
:root {
        --primary: #2E6C9E;
        --primary-dark: #245680;
        --primary-light: #EAF2F8;
        --accent: #F2A06A;
        --success: #3C9D8D;
        --body-bg: #F5F9FC;
        --card-bg: #FFFFFF;
        --text-main: #1E2B34;
        --text-secondary: #5A6F7E;
        --text-muted: #8A9AA6;
        --border-color: #DCE7EF;
        --divider-color: #EEF3F7;
        --shadow-card: 0 6px 20px rgba(35, 78, 107, .08);
        --shadow-hover: 0 14px 30px rgba(35, 78, 107, .14);
        --radius-sm: 10px;
        --radius-card: 16px;
        --radius-img: 12px;
        --font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
    }
    *,
    *:before,
    *:after {
        box-sizing: border-box;
    }
    html {
        scroll-behavior: smooth;
    }
    body {
        margin: 0;
        font-family: var(--font-family);
        background: var(--body-bg);
        color: var(--text-main);
        font-size: 16px;
        line-height: 1.8;
        -webkit-font-smoothing: antialiased;
    }
    img {
        max-width: 100%;
        height: auto;
        display: block;
    }
    a {
        color: inherit;
        text-decoration: none;
    }
    button,
    input,
    select,
    textarea {
        font: inherit;
    }
    button {
        cursor: pointer;
    }
    :focus-visible {
        outline: 3px solid rgba(46, 108, 158, .35);
        outline-offset: 2px;
        border-radius: 6px;
    }
    .container-site {
        max-width: 1280px;
        margin: 0 auto;
        padding-left: 16px;
        padding-right: 16px;
    }
    @media (min-width: 640px) {
        .container-site {
            padding-left: 24px;
            padding-right: 24px;
        }
    }
    @media (min-width: 1024px) {
        .container-site {
            padding-left: 32px;
            padding-right: 32px;
        }
    }
    .section-block {
        padding: 64px 0;
    }
    @media (min-width: 1024px) {
        .section-block {
            padding: 96px 0;
        }
    }
    .eyebrow {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        font-size: 13px;
        font-weight: 700;
        letter-spacing: .12em;
        color: var(--primary);
        background: var(--primary-light);
        border-radius: 999px;
        padding: 3px 14px;
        min-height: 28px;
        border: 1px solid #D4E3EE;
    }
    .h2-title {
        font-size: 28px;
        line-height: 1.3;
        font-weight: 800;
        color: var(--text-main);
        letter-spacing: -.01em;
    }
    @media (min-width: 1024px) {
        .h2-title {
            font-size: 34px;
        }
    }
    .h3-title {
        font-size: 20px;
        font-weight: 700;
        line-height: 1.45;
        color: var(--text-main);
    }
    .btn-primary {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        min-height: 44px;
        padding: 0 22px;
        border-radius: var(--radius-sm);
        background: var(--primary);
        color: #fff;
        font-weight: 600;
        border: 1px solid var(--primary);
        transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
        white-space: nowrap;
    }
    .btn-primary:hover {
        background: var(--primary-dark);
        border-color: var(--primary-dark);
        transform: translateY(-2px);
        box-shadow: 0 8px 18px rgba(46, 108, 158, .22);
    }
    .btn-primary:active {
        transform: translateY(0);
        box-shadow: none;
    }
    .btn-outline {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        min-height: 44px;
        padding: 0 22px;
        border-radius: var(--radius-sm);
        background: #fff;
        color: var(--primary);
        font-weight: 600;
        border: 1px solid var(--primary);
        transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
        white-space: nowrap;
    }
    .btn-outline:hover {
        background: var(--primary-light);
        transform: translateY(-2px);
        box-shadow: 0 8px 16px rgba(46, 108, 158, .12);
    }
    .btn-outline:active {
        transform: translateY(0);
        box-shadow: none;
    }
    .btn-link {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-weight: 600;
        color: var(--primary);
        transition: gap .2s ease, color .2s ease;
    }
    .btn-link:hover {
        color: var(--primary-dark);
        gap: 10px;
    }
    .nav-pill {
        display: inline-flex;
        align-items: center;
        min-height: 40px;
        padding: 6px 18px;
        border-radius: 999px;
        font-size: 15px;
        font-weight: 600;
        color: #3A5A70;
        white-space: nowrap;
        transition: background .2s ease, color .2s ease;
    }
    .nav-pill:hover {
        background: var(--primary-light);
        color: var(--primary-dark);
    }
    .nav-pill.active {
        background: var(--primary);
        color: #fff;
        box-shadow: 0 6px 14px rgba(46, 108, 158, .18);
    }
    .scrollbar-none {
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    .scrollbar-none::-webkit-scrollbar {
        display: none;
        width: 0;
        height: 0;
    }
    .card {
        background: #fff;
        border: 1px solid var(--border-color);
        border-radius: var(--radius-card);
        box-shadow: var(--shadow-card);
        transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .card-hover:hover {
        transform: translateY(-6px);
        box-shadow: var(--shadow-hover);
        border-color: #B9CFDF;
    }
    .stat-card {
        background: #fff;
        border: 1px solid var(--border-color);
        border-radius: var(--radius-card);
        padding: 26px 22px;
        box-shadow: var(--shadow-card);
        text-align: center;
    }
    .stat-number {
        font-size: 42px;
        line-height: 1.1;
        font-weight: 800;
        color: var(--primary-dark);
        font-variant-numeric: tabular-nums;
        letter-spacing: -.02em;
    }
    .badge {
        display: inline-flex;
        align-items: center;
        gap: 5px;
        padding: 3px 12px;
        border-radius: 999px;
        background: var(--primary-light);
        color: var(--primary-dark);
        font-size: 12px;
        font-weight: 700;
        min-height: 26px;
        border: 1px solid #D6E4F0;
    }
    .tag-pill {
        display: inline-flex;
        align-items: center;
        min-height: 30px;
        padding: 3px 14px;
        border-radius: 999px;
        background: #F0F4F7;
        border: 1px solid var(--divider-color);
        font-size: 13px;
        font-weight: 600;
        color: var(--text-secondary);
    }
    .input-field {
        width: 100%;
        min-height: 44px;
        padding: 10px 14px;
        border-radius: var(--radius-sm);
        border: 1px solid var(--border-color);
        background: #F8FAFC;
        color: var(--text-main);
        transition: border .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .input-field:focus {
        outline: none;
        border-color: var(--primary);
        background: #fff;
        box-shadow: 0 0 0 3px rgba(46, 108, 158, .16);
    }
    .label {
        display: block;
        font-size: 14px;
        font-weight: 600;
        margin-bottom: 6px;
        color: var(--text-main);
    }
    .faq-item {
        background: #fff;
        border: 1px solid var(--border-color);
        border-radius: var(--radius-card);
        overflow: hidden;
        transition: border-color .2s ease, box-shadow .2s ease;
    }
    .faq-item details summary {
        cursor: pointer;
        list-style: none;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 20px;
        padding: 18px 22px;
        font-weight: 700;
        color: var(--text-main);
        font-size: 16px;
        line-height: 1.6;
    }
    .faq-item details summary::-webkit-details-marker {
        display: none;
    }
    .faq-item details p {
        margin: 0;
        padding: 0 22px 20px;
        color: var(--text-secondary);
        font-size: 15px;
        line-height: 1.85;
    }
    .faq-item[data-open="true"] {
        border-left: 4px solid var(--primary);
    }
    .faq-arrow {
        width: 28px;
        height: 28px;
        flex-shrink: 0;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
        background: var(--primary-light);
        color: var(--primary);
        transition: transform .25s ease;
    }
    .faq-item details[open] .faq-arrow {
        transform: rotate(180deg);
    }
    .browser-window {
        background: #fff;
        border: 1px solid var(--border-color);
        border-radius: 16px;
        box-shadow: 0 20px 45px rgba(35, 78, 107, .14);
        overflow: hidden;
    }
    .browser-bar {
        display: flex;
        align-items: center;
        gap: 8px;
        padding: 12px 16px;
        background: #F4F8FB;
        border-bottom: 1px solid var(--divider-color);
    }
    .dot {
        width: 10px;
        height: 10px;
        border-radius: 50%;
        background: #C6D3DC;
    }
    .dot-red {
        background: #F2A06A;
    }
    .dot-green {
        background: #3C9D8D;
    }
    .floating-chip {
        position: absolute;
        background: #fff;
        border: 1px solid var(--border-color);
        border-radius: 14px;
        box-shadow: var(--shadow-hover);
        padding: 10px 18px;
        font-weight: 600;
        font-size: 14px;
        color: var(--primary-dark);
        display: inline-flex;
        align-items: center;
        gap: 8px;
    }
    .divider-line {
        height: 1px;
        background: var(--divider-color);
        border: 0;
        margin: 40px 0;
    }
    @media (max-width: 767px) {
        .h2-title {
            font-size: 24px;
        }
        .stat-number {
            font-size: 34px;
        }
    }
    @media (max-width: 520px) {
        .btn-primary,
        .btn-outline {
            width: 100%;
            padding: 0 16px;
        }
    }

/* roulang page: category1 */
:root {
            --primary: #2E6C9E;
            --primary-dark: #245680;
            --primary-light: #EAF2F8;
            --accent: #F2A06A;
            --bg: #F5F9FC;
            --card-bg: #FFFFFF;
            --text-main: #1E2B34;
            --text-secondary: #5A6F7E;
            --text-muted: #8A9AA6;
            --border: #DCE7EF;
            --divider: #EEF3F7;
            --success: #3C9D8D;
            --shadow-sm: 0 6px 20px rgba(35, 78, 107, 0.08);
            --shadow-lg: 0 14px 30px rgba(35, 78, 107, 0.14);
            --radius-btn: 10px;
            --radius-card: 16px;
            --radius-img: 12px;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
            background: var(--bg);
            color: var(--text-main);
            line-height: 1.8;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; }
        img { max-width: 100%; display: block; }
        button, input, select, textarea { font-family: inherit; }
        .container-main { max-width: 1280px; margin: 0 auto; padding-left: 1rem; padding-right: 1rem; }
        @media (min-width: 640px) { .container-main { padding-left: 1.5rem; padding-right: 1.5rem; } }
        @media (min-width: 1024px) { .container-main { padding-left: 2rem; padding-right: 2rem; } }
        .scrollbar-none { -ms-overflow-style: none; scrollbar-width: none; }
        .scrollbar-none::-webkit-scrollbar { display: none; }
        .text-main { color: var(--text-main); }
        .text-secondary { color: var(--text-secondary); }
        .text-muted { color: var(--text-muted); }
        .section-padding { padding-top: 4rem; padding-bottom: 4rem; }
        @media (min-width: 1024px) { .section-padding { padding-top: 5.5rem; padding-bottom: 5.5rem; } }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 44px;
            padding: 0.625rem 1.75rem;
            background-color: var(--primary);
            color: #fff;
            font-size: 0.9375rem;
            font-weight: 600;
            border-radius: var(--radius-btn);
            border: 1px solid transparent;
            transition: all 0.2s ease;
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-primary:hover { background-color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(46, 108, 158, 0.28); }
        .btn-primary:active { transform: translateY(0); }
        .btn-primary:focus-visible, .btn-secondary:focus-visible, .nav-pill:focus-visible, a:focus-visible, button:focus-visible { outline: 3px solid rgba(46, 108, 158, 0.5); outline-offset: 2px; }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 44px;
            padding: 0.625rem 1.75rem;
            background-color: #fff;
            color: var(--primary);
            font-size: 0.9375rem;
            font-weight: 600;
            border-radius: var(--radius-btn);
            border: 1px solid var(--primary);
            transition: all 0.2s ease;
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-secondary:hover { background-color: var(--primary-light); transform: translateY(-2px); }
        .btn-secondary:active { transform: translateY(0); }
        .card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }
        .card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: rgba(46, 108, 158, 0.4); }
        .tag-badge {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.85rem;
            border-radius: 999px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.02em;
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.8125rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--primary);
        }
        .section-label::before { content: ""; width: 28px; height: 2px; background: var(--accent); border-radius: 2px; }
        .section-title { font-size: 1.75rem; line-height: 1.3; font-weight: 800; color: var(--text-main); letter-spacing: -0.01em; margin-top: 0.5rem; }
        @media (min-width: 768px) { .section-title { font-size: 2.125rem; } }
        .section-desc { margin-top: 0.875rem; color: var(--text-secondary); max-width: 56ch; font-size: 0.9375rem; }
        @media (min-width: 768px) { .section-desc { font-size: 1rem; } }
        .number-stat { font-feature-settings: "tnum"; font-variant-numeric: tabular-nums; }
        .list-check { list-style: none; position: relative; }
        .list-check li { padding-left: 1.5rem; position: relative; margin-bottom: 0.75rem; color: var(--text-main); }
        .list-check li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0.55rem;
            width: 14px; height: 14px;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='none' stroke='%232E6C9E' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='4 10 8.5 14.5 16 6.5'/%3E%3C/svg%3E");
            background-size: contain;
        }
        .nav-pill {
            display: inline-flex;
            align-items: center;
            min-height: 38px;
            padding: 0.375rem 1.125rem;
            border-radius: 999px;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--primary);
            transition: all 0.18s ease;
            white-space: nowrap;
        }
        .nav-pill:hover { background-color: var(--primary-light); color: var(--primary-dark); }
        .nav-pill.active { background-color: var(--primary); color: #fff; font-weight: 600; }
        .header-link { color: var(--primary); font-weight: 500; transition: color 0.2s; }
        .header-link:hover { color: var(--primary-dark); }
        .faq-item { transition: all 0.3s ease; }
        .faq-item[open] .faq-arrow { transform: rotate(180deg); }
        .faq-question { list-style: none; }
        .faq-question::-webkit-details-marker { display: none; }
        .faq-question::before { display: none; }
        .faq-question { cursor: pointer; }
        .faq-arrow { transition: transform 0.3s ease; margin-left: auto; flex-shrink: 0; }
        .back-to-top { display: inline-flex; align-items: center; gap: 0.375rem; font-size: 0.875rem; color: var(--primary); font-weight: 600; transition: color 0.2s; }
        .back-to-top:hover { color: var(--primary-dark); }
        .roadmap-item { position: relative; padding-left: 2rem; }
        .roadmap-item::before {
            content: "";
            position: absolute;
            left: 6px;
            top: 12px;
            bottom: -2rem;
            width: 2px;
            background: var(--border);
        }
        .roadmap-item:last-child::before { display: none; }
        .roadmap-item::after {
            content: "";
            position: absolute;
            left: 0;
            top: 0.75rem;
            width: 14px; height: 14px;
            border-radius: 50%;
            background: var(--primary);
            border: 3px solid #fff;
            outline: 2px solid var(--border);
        }
        @media (max-width: 640px) {
            .hero-title { font-size: 2rem !important; line-height: 1.3 !important; }
            h2.section-title { font-size: 1.5rem; }
        }

/* roulang page: article */
:root {
            --brand: #2E6C9E;
            --brand-dark: #245680;
            --brand-soft: #EAF2F8;
            --accent: #F2A06A;
            --bg: #F5F9FC;
            --card: #FFFFFF;
            --text: #1E2B34;
            --text-subtle: #5A6F7E;
            --text-muted: #8A9AA6;
            --line: #DCE7EF;
            --line-soft: #EEF3F7;
            --green: #3C9D8D;
            --radius-card: 16px;
            --radius-btn: 10px;
            --radius-img: 12px;
            --shadow-card: 0 6px 20px rgba(35, 78, 107, 0.08);
            --shadow-lift: 0 14px 30px rgba(35, 78, 107, 0.14);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: PingFang SC, Hiragino Sans GB, Microsoft YaHei, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--bg);
            color: var(--text);
            font-size: 16px;
            line-height: 1.8;
            text-rendering: optimizeLegibility;
        }

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

        ul,
        ol {
            padding-left: 0;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

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

        button,
        input,
        textarea,
        select {
            font: inherit;
            color: inherit;
        }

        ::selection {
            background: rgba(46, 108, 158, 0.2);
        }

        :focus-visible {
            outline: 3px solid rgba(46, 108, 158, 0.4);
            outline-offset: 2px;
            border-radius: 6px;
        }

        .layout-container {
            width: 100%;
            max-width: 80rem;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        @media (min-width: 640px) {
            .layout-container {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }
        }

        @media (min-width: 1024px) {
            .layout-container {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        .scrollbar-none {
            scrollbar-width: none;
            -ms-overflow-style: none;
        }

        .scrollbar-none::-webkit-scrollbar {
            display: none;
        }

        .nav-pill {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            white-space: nowrap;
            min-height: 40px;
            padding: 0.45rem 1.1rem;
            border-radius: 9999px;
            font-size: 14px;
            font-weight: 600;
            color: var(--brand);
            border: 1px solid transparent;
            background: transparent;
            transition: background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
        }

        .nav-pill:hover {
            background: var(--brand-soft);
            color: var(--brand-dark);
        }

        .nav-pill.active {
            background: var(--brand);
            color: #ffffff;
            box-shadow: 0 4px 12px rgba(46, 108, 158, 0.24);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            min-height: 44px;
            padding: 0.65rem 1.45rem;
            border-radius: 10px;
            background: var(--brand);
            color: #ffffff;
            font-size: 15px;
            font-weight: 600;
            border: 1px solid transparent;
            box-shadow: 0 4px 12px rgba(46, 108, 158, 0.16);
            transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
        }

        .btn-primary:hover {
            background: var(--brand-dark);
            box-shadow: var(--shadow-lift);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: none;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            min-height: 44px;
            padding: 0.65rem 1.45rem;
            border-radius: 10px;
            background: #ffffff;
            color: var(--brand);
            font-size: 15px;
            font-weight: 600;
            border: 1px solid var(--line);
            box-shadow: 0 2px 6px rgba(35, 78, 107, 0.04);
            transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
        }

        .btn-secondary:hover {
            background: var(--brand-soft);
            border-color: #b7cfe0;
            color: var(--brand-dark);
            box-shadow: 0 6px 18px rgba(35, 78, 107, 0.08);
            transform: translateY(-1px);
        }

        .btn-secondary:active {
            transform: translateY(0);
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: var(--brand-soft);
            color: var(--brand-dark);
            border-radius: 9999px;
            padding: 0.28rem 0.85rem;
            font-size: 13px;
            font-weight: 600;
            border: 1px solid rgba(46, 108, 158, 0.14);
        }

        .article-prose {
            font-size: 17px;
            line-height: 1.9;
            color: var(--text);
            word-break: break-word;
            overflow-wrap: break-word;
        }

        .article-prose p {
            margin-bottom: 1.5em;
        }

        .article-prose h2 {
            font-size: 25px;
            line-height: 1.45;
            font-weight: 800;
            color: #172A36;
            margin: 2.2em 0 0.85em;
            padding-bottom: 0.5em;
            border-bottom: 1px solid var(--line-soft);
        }

        .article-prose h3 {
            font-size: 20px;
            line-height: 1.5;
            font-weight: 700;
            color: #213440;
            margin: 1.9em 0 0.75em;
        }

        .article-prose h4 {
            font-size: 18px;
            font-weight: 700;
            margin: 1.6em 0 0.6em;
        }

        .article-prose ul {
            list-style: disc;
            padding-left: 1.4em;
            margin: 0 0 1.6em;
        }

        .article-prose ol {
            list-style: decimal;
            padding-left: 1.5em;
            margin: 0 0 1.6em;
        }

        .article-prose li {
            margin: 0.45em 0;
            line-height: 1.8;
        }

        .article-prose a {
            color: var(--brand);
            text-decoration: underline;
            text-decoration-color: rgba(46, 108, 158, 0.35);
            text-underline-offset: 3px;
            transition: color 0.2s ease, text-decoration-color 0.2s ease;
        }

        .article-prose a:hover {
            color: var(--brand-dark);
            text-decoration-color: var(--brand-dark);
        }

        .article-prose blockquote {
            border-left: 4px solid var(--brand);
            background: var(--brand-soft);
            border-radius: 0 10px 10px 0;
            padding: 1rem 1.35rem;
            margin: 1.6em 0;
            color: #324957;
            font-style: normal;
        }

        .article-prose blockquote p {
            margin-bottom: 0.5em;
        }

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

        .article-prose img {
            border-radius: 12px;
            box-shadow: var(--shadow-card);
            margin: 1.6em auto;
        }

        .article-prose figure {
            margin: 1.8em 0;
        }

        .article-prose figcaption {
            color: var(--text-muted);
            font-size: 13px;
            line-height: 1.6;
            text-align: center;
            margin-top: 0.7em;
        }

        .article-prose code {
            background: var(--brand-soft);
            color: #245A80;
            border-radius: 5px;
            padding: 0.16em 0.45em;
            font-size: 0.92em;
        }

        .article-prose pre {
            background: #1E2B34;
            color: #E6EEF4;
            padding: 1.25rem 1.4rem;
            border-radius: 12px;
            overflow-x: auto;
            line-height: 1.7;
            margin: 1.6em 0;
        }

        .article-prose pre code {
            background: transparent;
            color: inherit;
            padding: 0;
        }

        .article-prose table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.6em 0;
            font-size: 15px;
            line-height: 1.7;
        }

        .article-prose th,
        .article-prose td {
            border: 1px solid var(--line-soft);
            padding: 0.7rem 0.9rem;
            text-align: left;
        }

        .article-prose th {
            background: var(--brand-soft);
            color: #213440;
            font-weight: 700;
        }

        .article-prose hr {
            border: none;
            border-top: 1px solid var(--line-soft);
            margin: 2.2em 0;
        }

        .article-prose > :last-child {
            margin-bottom: 0;
        }

        .search-field {
            background: #F5F9FC;
            border: 1px solid var(--line);
            border-radius: 10px;
            transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
        }

        .search-field:focus-within {
            border-color: var(--brand);
            box-shadow: 0 0 0 3px rgba(46, 108, 158, 0.18);
            background: #FFFFFF;
        }

        .search-field input {
            background: transparent;
            border: 0;
            outline: none;
            width: 100%;
            height: 42px;
            font-size: 14px;
            color: var(--text);
            padding: 0 1rem;
        }

        .search-field input::placeholder {
            color: var(--text-muted);
        }

        .card-link {
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
        }

        .card-link:hover {
            box-shadow: var(--shadow-lift);
            transform: translateY(-3px);
            border-color: #b7cfe0;
        }

        .empty-icon {
            background: var(--brand-soft);
            color: var(--brand);
        }

        @media (max-width: 640px) {
            .article-prose {
                font-size: 16.5px;
            }

            .article-prose h2 {
                font-size: 21px;
            }

            .article-prose h3 {
                font-size: 18px;
            }
        }

/* roulang page: category2 */
:root {
  --primary: #2E6C9E;
  --primary-dark: #245680;
  --primary-light: #EAF2F8;
  --accent: #F2A06A;
  --bg-body: #F5F9FC;
  --card-bg: #FFFFFF;
  --ink: #1E2B34;
  --body-text: #3D5260;
  --muted: #5A6F7E;
  --border: #DCE7EF;
  --divider: #EEF3F7;
  --radius-card: 16px;
  --radius-btn: 10px;
  --shadow-card: 0 6px 20px rgba(35, 78, 107, 0.08);
  --shadow-hover: 0 14px 30px rgba(35, 78, 107, 0.14);
}
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg-body);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
*, *::before, *::after { box-sizing: border-box; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
input, select, textarea, button { font: inherit; color: inherit; }
.scrollbar-none { scrollbar-width: none; }
.scrollbar-none::-webkit-scrollbar { display: none; }
.logo-mark {
  display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 14px; flex: none;
  background: var(--primary); color: #fff; font-weight: 800; font-size: 20px;
  box-shadow: 0 8px 18px rgba(46, 108, 158, 0.18);
}
.nav-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: 999px; font-size: 14px; font-weight: 600;
  color: #2E4C63; border: 1px solid transparent; transition: all 0.2s ease;
  outline: none;
}
.nav-pill:hover:not(.active) { color: var(--primary); background: #E7F1F8; }
.nav-pill.active { background: var(--primary); color: #fff; box-shadow: 0 6px 14px rgba(46, 108, 158, 0.22); }
.nav-pill:focus-visible { box-shadow: 0 0 0 3px rgba(46, 108, 158, 0.35); }
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px;
  background: var(--primary); color: #fff; border: 1px solid var(--primary);
  border-radius: var(--radius-btn); padding: 10px 22px; font-weight: 700; font-size: 15px;
  transition: all 0.2s ease;
}
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 12px 24px rgba(46, 108, 158, 0.2); }
.btn-primary:active { transform: translateY(0); box-shadow: none; }
.btn-primary:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(46, 108, 158, 0.35); }
.btn-secondary {
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px;
  background: #fff; color: var(--primary); border: 1px solid var(--border);
  border-radius: var(--radius-btn); padding: 10px 22px; font-weight: 700; font-size: 15px;
  transition: all 0.2s ease;
}
.btn-secondary:hover { border-color: var(--primary); background: #F2F7FB; transform: translateY(-2px); box-shadow: 0 10px 22px rgba(35, 78, 107, 0.08); }
.btn-secondary:active { transform: translateY(0); }
.btn-secondary:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(46, 108, 158, 0.35); }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; color: var(--primary);
  font-size: 13px; font-weight: 800; letter-spacing: 0.12em;
}
.eyebrow::before {
  content: ""; width: 20px; height: 3px; border-radius: 4px; background: var(--accent);
}
.badge-hero {
  display: inline-flex; align-items: center; gap: 8px;
  background: #E7F1F8; color: var(--primary); border: 1px solid #CFE2EF;
  border-radius: 999px; padding: 8px 16px; font-size: 13px; font-weight: 700;
  margin-bottom: 22px;
}
.section-title {
  font-size: 30px; line-height: 1.3; font-weight: 800; letter-spacing: -0.02em;
  color: var(--ink);
}
@media (min-width: 640px) { .section-title { font-size: 34px; } }
.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-card);
  box-shadow: var(--shadow-card); transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: #C8D9E7; }
.icon-square {
  display: inline-flex; align-items: center; justify-content: center; flex: none;
  width: 44px; height: 44px; border-radius: 12px; background: var(--primary-light);
  color: var(--primary);
}
.left-nav-link {
  display: flex; align-items: center; gap: 10px; width: 100%;
  padding: 12px 14px; border-radius: 12px; font-size: 14px; font-weight: 600;
  color: #334B5E; background: transparent; transition: all 0.2s ease;
}
.left-nav-link:hover { background: #EDF5FA; color: var(--primary); }
.left-nav-link .step-badge {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 8px; background: #F0F5F9;
  color: var(--muted); font-size: 12px; font-weight: 800; flex: none;
}
.anchor-list-card { position: sticky; top: 148px; }
.channel-card {
  position: relative; overflow: hidden; background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 26px; box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.channel-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: #B9CFDF; }
.card-tag {
  display: inline-block; background: var(--primary-light); color: var(--primary);
  border-radius: 999px; font-size: 12px; font-weight: 700; padding: 5px 12px;
}
.list-check {
  list-style: none; margin: 14px 0 0; padding: 0;
}
.list-check li {
  position: relative; padding-left: 24px; margin-top: 8px;
  font-size: 14px; color: #445C6B; line-height: 1.7;
}
.list-check li::before {
  content: ""; position: absolute; left: 2px; top: 10px;
  width: 10px; height: 6px; border-left: 2px solid var(--primary);
  border-bottom: 2px solid var(--primary); transform: rotate(-45deg);
  border-radius: 1px;
}
.scene-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-card);
  padding: 28px; height: 100%; transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.scene-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.step-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-card);
  padding: 26px 24px; position: relative; width: 100%;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.step-number {
  font-size: 44px; font-weight: 800; line-height: 1; color: #E2EDF5;
  font-variant-numeric: tabular-nums;
}
.resource-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-card);
  overflow: hidden; height: 100%; box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.resource-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.resource-card img { width: 100%; height: 196px; object-fit: cover; }
.resource-card .resource-body { padding: 22px; }
.faq-card {
  background: #fff; border: 1px solid var(--border); border-radius: 14px;
  overflow: hidden; transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.faq-card.open { border-color: #C4D9E8; box-shadow: 0 10px 24px rgba(35, 78, 107, 0.08); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  width: 100%; padding: 18px 20px; background: transparent; border: 0;
  text-align: left; font-size: 16px; font-weight: 700; color: #1C2A33;
  cursor: pointer; transition: background 0.2s ease;
}
.faq-question:hover { background: #F0F6FA; }
.faq-arrow {
  flex: none; width: 28px; height: 28px; border-radius: 50%;
  background: var(--primary-light); color: var(--primary);
  display: inline-flex; align-items: center; justify-content: center;
  transition: transform 0.3s ease;
}
.faq-card.open .faq-arrow { transform: rotate(180deg); }
.faq-answer { display: none; padding: 0 22px 20px; font-size: 15px; color: #405868; line-height: 1.9; border-top: 1px dashed var(--divider); margin: 0 20px; padding-left: 0; padding-right: 0; padding-top: 14px; }
.faq-card.open .faq-answer { display: block; }
.form-field {
  width: 100%; background: #F7FAFC; border: 1px solid var(--border);
  border-radius: var(--radius-btn); padding: 12px 14px; font-size: 14px;
  color: var(--ink); transition: all 0.2s ease; outline: none;
}
.form-field:focus { border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(46, 108, 158, 0.15); }
.form-label {
  display: block; font-size: 14px; font-weight: 700; color: #2A4050;
  margin-bottom: 7px;
}
.form-label span { color: #C03A3A; margin-left: 2px; }
.contact-list-item { display: flex; gap: 14px; align-items: flex-start; }
.contact-icon {
  width: 42px; height: 42px; display: inline-flex; align-items: center; justify-content: center;
  flex: none; border-radius: 12px; background: var(--primary-light); color: var(--primary);
}
.section-bg-soft { background: #F2F7FB; }

/* roulang page: category3 */
:root {
            --primary: #2E6C9E;
            --primary-dark: #245680;
            --primary-light: #EAF2F8;
            --accent: #F2A06A;
            --bg-body: #F5F9FC;
            --bg-card: #FFFFFF;
            --text-main: #1E2B34;
            --text-muted: #5A6F7E;
            --text-weak: #8A9AA6;
            --border-color: #DCE7EF;
            --divider: #EEF3F7;
            --success: #3C9D8D;
            --shadow-sm: 0 6px 20px rgba(35, 78, 107, 0.08);
            --shadow-lg: 0 14px 30px rgba(35, 78, 107, 0.14);
            --radius-btn: 10px;
            --radius-card: 16px;
            --radius-img: 12px;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
            background: var(--bg-body);
            color: var(--text-main);
            font-size: 16px;
            line-height: 1.85;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }

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

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

        a {
            color: inherit;
            text-decoration: none;
        }

        a,
        button,
        input,
        select,
        textarea {
            transition: all .24s ease;
        }

        :focus-visible {
            outline: 3px solid rgba(46, 108, 158, .28);
            outline-offset: 2px;
        }

        .scrollbar-none {
            scrollbar-width: none;
            -ms-overflow-style: none;
        }
        .scrollbar-none::-webkit-scrollbar {
            display: none;
        }

        .container-page {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        .nav-pill {
            min-height: 38px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: .32rem 1rem;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            color: #3A5262;
            border: 1px solid transparent;
            background: transparent;
            white-space: nowrap;
            transition: all .24s ease;
        }
        .nav-pill:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
        }
        .nav-pill:active {
            background: #D9E7F2;
        }
        .nav-pill.active {
            background: var(--primary);
            color: #FFFFFF;
            font-weight: 600;
            box-shadow: 0 4px 12px rgba(46, 108, 158, .2);
        }

        .btn-primary,
        .btn-secondary {
            min-height: 44px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .45rem;
            padding: .56rem 1.35rem;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            transition: all .24s ease;
            border: 1px solid transparent;
        }
        .btn-primary {
            background: var(--primary);
            color: #FFFFFF;
            box-shadow: 0 6px 16px rgba(46, 108, 158, .18);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 10px 22px rgba(35, 78, 107, .2);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 10px rgba(35, 78, 107, .16);
        }

        .btn-secondary {
            background: #FFFFFF;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-secondary:hover {
            background: var(--primary-light);
            border-color: var(--primary-dark);
            color: var(--primary-dark);
            transform: translateY(-1px);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }

        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-sm);
            transition: all .28s ease;
        }
        .card:hover {
            border-color: #B8CFE0;
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }

        .badge-soft {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            padding: .3rem .85rem;
            border-radius: 999px;
            background: var(--primary-light);
            color: var(--primary-dark);
            font-size: 13px;
            font-weight: 600;
            line-height: 1.4;
        }

        .section-number {
            display: inline-flex;
            align-items: center;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: .14em;
            color: var(--primary);
        }
        .section-number::after {
            content: "";
            width: 2.5rem;
            height: 2px;
            margin-left: .75rem;
            background: var(--accent);
            border-radius: 2px;
        }

        .step-card {
            position: relative;
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-card);
            padding: 1.7rem 1.5rem;
            box-shadow: var(--shadow-sm);
        }
        .step-card .step-num {
            width: 42px;
            height: 42px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 50%;
            font-weight: 800;
            font-size: 17px;
        }

        .faq-item {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: 14px;
            box-shadow: 0 3px 10px rgba(35, 78, 107, .04);
            padding: 0;
            overflow: hidden;
        }
        .faq-item summary {
            list-style: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1.15rem 1.3rem;
            font-weight: 600;
            font-size: 16px;
            line-height: 1.6;
            background: #FFFFFF;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary:hover {
            background: #F8FBFD;
        }
        .faq-item .faq-icon {
            flex: 0 0 auto;
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
        }
        .faq-item[open] summary {
            border-bottom: 1px solid var(--divider);
        }
        .faq-item[open] .faq-icon {
            transform: rotate(180deg);
            background: var(--primary);
            color: #FFFFFF;
        }
        .faq-item .faq-body {
            padding: 1rem 1.3rem 1.3rem;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.9;
        }
        .faq-item[open] {
            border-left: 4px solid var(--primary);
            border-radius: 14px;
        }

        .bg-grid-light {
            background-image: linear-gradient(to right, rgba(46, 108, 158, .06) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(46, 108, 158, .06) 1px, transparent 1px);
            background-size: 34px 34px;
        }

        .form-control {
            display: block;
            width: 100%;
            min-height: 44px;
            padding: .6rem .9rem;
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-btn);
            font-size: 15px;
            color: var(--text-main);
            line-height: 1.5;
        }
        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(46, 108, 158, .14);
            outline: none;
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }

        .footer-col h3 {
            color: #FFFFFF;
            font-size: 15px;
            font-weight: 700;
            letter-spacing: .04em;
        }
        .footer-col ul {
            margin-top: 1.1rem;
            display: grid;
            gap: .7rem;
        }
        .footer-col ul a {
            color: #B5C9D8;
            font-size: 14px;
        }
        .footer-col ul a:hover {
            color: #FFFFFF;
        }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: .06em;
            color: var(--primary);
            background: #EAF2F8;
            padding: .3rem .85rem;
            border-radius: 999px;
        }

        .hero-title {
            font-size: 42px;
            line-height: 1.2;
            font-weight: 800;
            letter-spacing: -0.01em;
            color: #16334A;
            margin: 0 0 1.2rem;
        }
        @media (max-width: 1023px) {
            .hero-title {
                font-size: 36px;
            }
        }
        @media (max-width: 640px) {
            .hero-title {
                font-size: 31px;
            }
        }

        .h2-title {
            font-size: 30px;
            line-height: 1.3;
            font-weight: 800;
            color: #16334A;
            letter-spacing: -0.01em;
        }
        @media (max-width: 767px) {
            .h2-title {
                font-size: 25px;
            }
        }

        .text-secondary {
            color: var(--text-muted);
        }
        .light-line {
            border-color: rgba(255, 255, 255, .16);
        }
        .mock-stat {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: .8rem;
        }
        .mock-stat-item {
            background: rgba(255, 255, 255, .72);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255, 255, 255, .6);
            border-radius: 12px;
            padding: .75rem .8rem;
        }
        @media (max-width: 520px) {
            .mock-stat {
                grid-template-columns: 1fr;
            }
        }