/* roulang page: index */
:root {
        --primary: #0E78F0;
        --primary-deep: #0B5FC7;
        --accent: #1BCB9C;
        --warning: #F6B84B;
        --navy: #081A2E;
        --deep: #051220;
        --panel: #0D2438;
        --ink: #122A38;
        --muted: #5C7080;
        --line: #E3EAF0;
        --wash: #F4F7FA;
        --card-radius: 16px;
        --glass-radius: 20px;
        --shadow-card: 0 6px 24px rgba(18, 42, 56, .06);
        --shadow-hover: 0 14px 34px rgba(18, 42, 56, .10);
    }

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

    html {
        scroll-behavior: smooth;
    }

    body {
        margin: 0;
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        font-size: 16px;
        line-height: 1.75;
        color: #122A38;
        background: #FFFFFF;
        -webkit-font-smoothing: antialiased;
        text-rendering: optimizeLegibility;
        padding-bottom: 84px;
    }

    body.no-overflow {
        overflow: hidden;
    }

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

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

    a:focus-visible,
    button:focus-visible,
    summary:focus-visible,
    input:focus-visible {
        outline: 3px solid rgba(14, 120, 240, .35);
        outline-offset: 2px;
        border-radius: 6px;
    }

    button {
        font-family: inherit;
        cursor: pointer;
    }

    ::selection {
        background: rgba(14, 120, 240, .14);
        color: #122A38;
    }

    .site-header {
        transition: box-shadow .25s ease, border-color .25s ease;
    }

    .site-header.header-scrolled {
        box-shadow: 0 8px 24px rgba(18, 42, 56, .06);
        border-bottom-color: rgba(227, 234, 240, .9);
    }

    .nav-link {
        position: relative;
        display: inline-flex;
        align-items: center;
        font-size: 15px;
        font-weight: 500;
        color: #314A5E;
        padding: .45rem .2rem;
        transition: color .2s ease;
    }

    .nav-link::after {
        content: "";
        position: absolute;
        left: 0;
        right: 100%;
        bottom: 0;
        height: 2px;
        border-radius: 99px;
        background: linear-gradient(90deg, #0E78F0, #1BCB9C);
        transition: right .2s ease;
    }

    .nav-link:hover {
        color: #0E78F0;
    }

    .nav-link:hover::after,
    .nav-link.active::after {
        right: 0;
    }

    .nav-link.active {
        color: #0E78F0;
    }

    .logo-mark {
        width: 38px;
        height: 38px;
        border-radius: 12px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        background: linear-gradient(135deg, #0E78F0 0%, #1BCB9C 100%);
        color: #fff;
        font-weight: 800;
        letter-spacing: -0.02em;
        box-shadow: 0 6px 18px rgba(14, 120, 240, .24);
    }

    footer .logo-mark {
        box-shadow: 0 0 0 1px rgba(255, 255, 255, .1), 0 6px 18px rgba(0, 0, 0, .2);
    }

    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: .5rem;
        padding: .7rem 1.25rem;
        border-radius: 12px;
        font-weight: 600;
        font-size: 15px;
        line-height: 1.2;
        border: 1px solid transparent;
        transition: all .2s ease;
        user-select: none;
        text-align: center;
        white-space: nowrap;
    }

    .btn-primary {
        background: var(--primary);
        color: #fff;
        box-shadow: 0 10px 30px -8px rgba(14, 120, 240, .6);
    }

    .btn-primary:hover {
        background: #2B8AF5;
        transform: translateY(-1px);
        box-shadow: 0 14px 36px -6px rgba(14, 120, 240, .68);
    }

    .btn-primary:active {
        transform: translateY(0) scale(.99);
    }

    .btn-ghost-light {
        background: rgba(255, 255, 255, .06);
        border: 1px solid rgba(255, 255, 255, .28);
        color: #fff;
        backdrop-filter: blur(6px);
    }

    .btn-ghost-light:hover {
        background: rgba(255, 255, 255, .12);
        border-color: rgba(255, 255, 255, .48);
        transform: translateY(-1px);
    }

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

    .btn-outline {
        border-color: #C3D0DB;
        color: #314A5E;
        background: #fff;
    }

    .btn-outline:hover {
        border-color: #0E78F0;
        color: #0E78F0;
        background: #F5F9FF;
        transform: translateY(-1px);
    }

    .btn-sm {
        padding: .5rem .9rem;
        font-size: 14px;
        border-radius: 10px;
    }

    .section-eyebrow {
        display: inline-flex;
        align-items: center;
        gap: .45rem;
        padding: .3rem .8rem;
        border-radius: 999px;
        background: rgba(14, 120, 240, .09);
        color: #0E78F0;
        font-size: 13px;
        font-weight: 600;
        letter-spacing: .02em;
    }

    .section-eyebrow.light {
        background: rgba(255, 255, 255, .14);
        color: #DCEFFF;
    }

    .section-title {
        font-weight: 800;
        letter-spacing: -0.02em;
        color: #122A38;
        line-height: 1.25;
    }

    .section-title-light {
        font-weight: 800;
        letter-spacing: -0.02em;
        color: #fff;
        line-height: 1.25;
    }

    .section-subtitle {
        color: #5C7080;
        font-size: 16px;
        line-height: 1.8;
    }

    .section-subtitle-light {
        color: rgba(226, 236, 243, .8);
        font-size: 16px;
        line-height: 1.8;
    }

    .hero-backdrop {
        background-color: #051220;
        background-image: url('/assets/images/backpic/back-1.png');
        background-size: cover;
        background-position: center;
    }

    .hero-backdrop::before {
        content: "";
        position: absolute;
        inset: 0;
        background:
            radial-gradient(circle at 76% 24%, rgba(27, 203, 156, .16), transparent 26%),
            radial-gradient(circle at 12% 82%, rgba(14, 120, 240, .28), transparent 36%),
            linear-gradient(90deg, rgba(5, 18, 32, .92) 0%, rgba(8, 26, 46, .82) 46%, rgba(13, 36, 56, .5) 100%);
    }

    .glass-card {
        background: rgba(255, 255, 255, .07);
        border: 1px solid rgba(255, 255, 255, .13);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-radius: 20px;
    }

    .glass-card-strong {
        background: rgba(255, 255, 255, .1);
        border: 1px solid rgba(255, 255, 255, .16);
        backdrop-filter: blur(18px);
        -webkit-backdrop-filter: blur(18px);
        border-radius: 22px;
    }

    .card-white {
        border-radius: 16px;
        background: #fff;
        border: 1px solid rgba(18, 42, 56, .07);
        box-shadow: 0 6px 24px rgba(18, 42, 56, .06);
        transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
    }

    .card-white:hover {
        transform: translateY(-4px);
        box-shadow: 0 14px 34px rgba(18, 42, 56, .1);
        border-color: rgba(14, 120, 240, .28);
    }

    .line-clamp-1 {
        display: -webkit-box;
        -webkit-line-clamp: 1;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .line-clamp-2 {
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .line-clamp-3 {
        display: -webkit-box;
        -webkit-line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .tag-soft {
        display: inline-flex;
        align-items: center;
        padding: .18rem .62rem;
        border-radius: 999px;
        font-size: 12px;
        font-weight: 600;
        background: #E7F3FF;
        color: #0B65C9;
    }

    .tag-mint {
        display: inline-flex;
        align-items: center;
        padding: .18rem .62rem;
        border-radius: 999px;
        font-size: 12px;
        font-weight: 600;
        background: rgba(27, 203, 156, .12);
        color: #0C9273;
    }

    .trust-item {
        padding: 1.6rem 1.2rem;
        text-align: center;
        border-right: 1px solid rgba(18, 42, 56, .06);
    }

    .trust-item:last-child {
        border-right: none;
    }

    .trust-num {
        font-size: 28px;
        font-weight: 800;
        letter-spacing: -0.03em;
        color: #0E78F0;
        line-height: 1.1;
    }

    .news-main-card {
        border-radius: 20px;
        background: #fff;
        border: 1px solid rgba(18, 42, 56, .075);
        box-shadow: 0 8px 28px rgba(18, 42, 56, .07);
        overflow: hidden;
    }

    .news-mini-item {
        display: block;
        width: 100%;
        border-radius: 16px;
        background: #fff;
        border: 1px solid rgba(18, 42, 56, .07);
        box-shadow: 0 4px 14px rgba(18, 42, 56, .04);
        padding: 1rem 1.05rem;
        transition: transform .22s ease, border-color .22s ease, box-shadow .22s ease;
    }

    .news-mini-item:hover {
        transform: translateY(-2px);
        border-color: rgba(14, 120, 240, .25);
        box-shadow: 0 10px 26px rgba(18, 42, 56, .08);
    }

    .news-mini-item .news-arrow {
        color: #9BAEBD;
        transition: color .2s ease, transform .2s ease;
    }

    .news-mini-item:hover .news-arrow {
        color: #0E78F0;
        transform: translateX(3px);
    }

    .flow-step {
        border-radius: 18px;
        border: 1px solid rgba(18, 42, 56, .07);
        background: #fff;
        box-shadow: 0 5px 18px rgba(18, 42, 56, .045);
    }

    .faq-list details {
        border-radius: 16px;
        border: 1px solid rgba(18, 42, 56, .08);
        background: #FFFFFF;
        box-shadow: 0 4px 16px rgba(18, 42, 56, .04);
        padding: 0 1.2rem;
        transition: border-color .2s ease, box-shadow .2s ease;
        overflow: hidden;
    }

    .faq-list details[open] {
        border-color: rgba(14, 120, 240, .18);
        box-shadow: 0 8px 22px rgba(18, 42, 56, .07);
    }

    .faq-list summary {
        list-style: none;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 1rem;
        font-weight: 700;
        font-size: 16px;
        color: #122A38;
        padding: 1.05rem 0;
        transition: color .2s ease;
    }

    .faq-list summary::-webkit-details-marker {
        display: none;
    }

    .faq-list summary::after {
        content: "+";
        flex: 0 0 auto;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 24px;
        height: 24px;
        border-radius: 50%;
        background: #EAF2FA;
        color: #0E78F0;
        font-size: 18px;
        font-weight: 600;
        transition: transform .25s ease, background .25s ease;
    }

    .faq-list details[open] summary::after {
        transform: rotate(45deg);
        background: rgba(14, 120, 240, .12);
    }

    .faq-answer {
        color: #5C7080;
        font-size: 15px;
        line-height: 1.75;
        padding-bottom: 1.2rem;
    }

    .background-point-grid {
        background-image: radial-gradient(rgba(255, 255, 255, .12) 1px, transparent 1px);
        background-size: 26px 26px;
    }

    .cta-capsule {
        background: rgba(255, 255, 255, .08);
        border: 1px solid rgba(255, 255, 255, .14);
        backdrop-filter: blur(18px);
        -webkit-backdrop-filter: blur(18px);
        border-radius: 32px;
    }

    .footer-link {
        display: inline-block;
        font-size: 14px;
        color: rgba(226, 236, 243, .72);
        transition: color .2s ease, transform .2s ease;
    }

    .footer-link:hover {
        color: #fff;
        transform: translateX(2px);
    }

    .bottom-cta {
        position: fixed;
        left: 50%;
        bottom: max(.85rem, env(safe-area-inset-bottom));
        transform: translate(-50%, .8rem);
        z-index: 70;
        max-width: min(780px, calc(100vw - 1.4rem));
        width: calc(100% - 1.4rem);
        background: rgba(255, 255, 255, .88);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border: 1px solid rgba(255, 255, 255, .6);
        border-radius: 999px;
        box-shadow: 0 16px 40px rgba(5, 18, 32, .24);
        padding: .45rem .5rem .45rem 1.1rem;
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transition: all .35s ease;
    }

    body.show-bottom-cta .bottom-cta {
        opacity: 1;
        visibility: visible;
        transform: translate(-50%, 0);
        pointer-events: auto;
    }

    .mobile-nav-panel {
        max-height: calc(100vh - 68px);
        overflow-y: auto;
    }

    .mobile-nav-link {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: .85rem .2rem;
        border-bottom: 1px solid rgba(18, 42, 56, .06);
        font-size: 15px;
        font-weight: 600;
        color: #122A38;
    }

    .mobile-nav-link.active {
        color: #0E78F0;
    }

    .hero-half-visual {
        border-radius: 24px;
    }

    @media (max-width: 1023px) {
        .trust-item {
            border-right: none;
            border-bottom: 1px solid rgba(18, 42, 56, .06);
        }

        .trust-grid-mobile {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
        }
    }

    @media (max-width: 640px) {
        .trust-num {
            font-size: 24px;
        }

        .section-title {
            letter-spacing: -0.01em;
        }
    }

    @media (prefers-reduced-motion: reduce) {
        * {
            animation-duration: .01ms !important;
            transition-duration: .01ms !important;
        }
    }
</script>
<style id="roulang-fallback-style">
  body{font-family:"Microsoft YaHei",system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.7;color:#1f2937;background:#f7f9fc}
  header,footer{background:#0f172a;color:#fff} header a,footer a{color:inherit;text-decoration:none}
  main section{padding:64px 0} .container{max-width:1180px}
  .hero,.site-hero{background:linear-gradient(135deg,#0f172a,#1d4ed8);color:#fff}
  .card,.feature-card,.service-card,.category-card{border:1px solid rgba(15,23,42,.08);box-shadow:0 12px 32px rgba(15,23,42,.08);border-radius:16px}
  .btn,.button,a[class*="btn"]{border-radius:999px;font-weight:700}
  img{max-width:100%;height:auto} @media(max-width:768px){main section{padding:42px 0} h1{font-size:2rem}}

/* roulang page: category1 */
:root {
            --c-primary: #0E78F0;
            --c-primary-deep: #0B63C7;
            --c-secondary: #1BCB9C;
            --c-gold: #F6B84B;
            --c-navy: #081A2E;
            --c-navy-deep: #051220;
            --c-panel: #0D2438;
            --c-soft: #F4F7FA;
            --c-border: #E3EAF0;
            --c-text: #122A38;
            --c-text-soft: #5A7087;
            --c-white: #FFFFFF;
            --shadow-card: 0 10px 32px -14px rgba(5, 30, 52, 0.16);
            --shadow-hover: 0 18px 42px -16px rgba(5, 30, 52, 0.2);
            --radius-card: 16px;
            --radius-glossy: 22px;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 100px;
        }

        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background: #FFFFFF;
            color: var(--c-text);
            line-height: 1.7;
        }

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

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

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

        :focus-visible {
            outline: 2px solid rgba(14, 120, 240, 0.4);
            outline-offset: 2px;
        }

        .nav-link {
            position: relative;
            display: inline-flex;
            align-items: center;
            padding: 0.45rem 0.15rem;
            color: #30465c;
            font-size: 15px;
            transition: color 0.2s ease;
        }

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

        .nav-link.active {
            color: var(--c-primary);
            font-weight: 600;
        }

        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -10px;
            height: 2px;
            border-radius: 2px;
            background: var(--c-primary);
        }

        .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 11px;
            background: var(--c-primary);
            color: #fff;
            font-size: 17px;
            font-weight: 800;
            letter-spacing: 1px;
            box-shadow: 0 8px 18px -8px rgba(14, 120, 240, 0.55);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            border-radius: 10px;
            padding: 0.7rem 1.25rem;
            font-size: 15px;
            font-weight: 600;
            line-height: 1.2;
            border: 1px solid transparent;
            cursor: pointer;
            transition: background-color 0.2s, box-shadow 0.2s, border-color 0.2s, transform 0.15s;
        }

        .btn:active {
            transform: translateY(1px);
        }

        .btn-primary {
            background: var(--c-primary);
            color: #fff;
            box-shadow: 0 10px 32px -10px rgba(14, 120, 240, 0.6);
        }

        .btn-primary:hover {
            background: var(--c-primary-deep);
            box-shadow: 0 14px 36px -10px rgba(14, 120, 240, 0.65);
            transform: translateY(-2px);
        }

        .btn-outline-light {
            background: transparent;
            border-color: rgba(255, 255, 255, 0.55);
            color: #fff;
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.9);
            transform: translateY(-2px);
        }

        .btn-outline-dark {
            background: transparent;
            border-color: #D3DEE7;
            color: var(--c-text);
        }

        .btn-outline-dark:hover {
            border-color: var(--c-primary);
            color: var(--c-primary);
            transform: translateY(-2px);
        }

        .section-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--c-primary);
            font-size: 14px;
            font-weight: 700;
        }

        .section-eyebrow::before {
            content: "";
            width: 6px;
            height: 6px;
            border-radius: 99px;
            background: var(--c-secondary);
        }

        .glossy-card {
            background: rgba(255, 255, 255, 0.07);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid rgba(255, 255, 255, 0.18);
            border-radius: var(--radius-glossy);
            box-shadow: 0 24px 60px -34px rgba(5, 20, 40, 0.9);
        }

        .card-lift {
            transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
        }

        .card-lift:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: #D5E2EC;
        }

        .feature-card {
            border-radius: 14px;
            background: #fff;
            border: 1px solid var(--c-border);
            padding: 1.25rem;
            height: 100%;
            transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
        }

        .feature-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: #CFE0EC;
        }

        .article-tag {
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
            padding: 0.2rem 0.6rem;
            border-radius: 999px;
            background: #E4F1FF;
            color: #0E78F0;
            font-size: 12px;
            font-weight: 600;
        }

        .footer-link {
            color: #AFC4D6;
            transition: color 0.2s ease;
        }

        .footer-link:hover {
            color: #FFFFFF;
        }

        .head-cta {
            width: 100%;
        }

        .hero-bg-1 {
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
        }

        .cta-bg-2 {
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
        }

        .faq-item {
            overflow: hidden;
            border-radius: 16px;
            border: 1px solid #E3EAF0;
            background: #FFFFFF;
            transition: box-shadow 0.2s ease;
        }

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

        .faq-item summary {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            cursor: pointer;
            list-style: none;
            padding: 1.1rem 1.3rem;
            font-weight: 600;
            color: #122A38;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-icon {
            position: relative;
            flex: none;
            width: 24px;
            height: 24px;
            border-radius: 8px;
            background: #E4F1FF;
            color: #0E78F0;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
        }

        .faq-icon::before {
            content: "+";
            font-size: 22px;
            line-height: 1;
            font-weight: 500;
        }

        details[open] .faq-icon {
            transform: rotate(45deg);
            background: #0E78F0;
            color: #fff;
        }

        .faq-answer {
            color: #4A6176;
            font-size: 15px;
            line-height: 1.8;
            padding: 0.2rem 1.3rem 1.2rem;
        }

        .sticky-side {
            position: sticky;
            top: 96px;
        }

/* roulang page: article */
:root {
            --bg-main: #F4F7FA;
            --bg-dark: #081A2E;
            --bg-deep-dark: #051220;
            --panel-dark: #0D2438;
            --panel-light: #FFFFFF;
            --primary: #0E78F0;
            --accent: #1BCB9C;
            --warn: #F6B84B;
            --ink: #122A38;
            --ink-soft: #4E6473;
            --ink-muted: #7C8E9A;
            --line-soft: #E3EAF0;
            --line-dark: rgba(255, 255, 255, 0.12);
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 22px;
            --shadow-card: 0 16px 44px rgba(5, 18, 32, 0.08);
            --shadow-btn: 0 10px 22px rgba(14, 120, 240, 0.28);
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-main);
            color: var(--ink);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
        }

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

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

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

        ul,
        ol {
            list-style: none;
        }

        .container-custom {
            max-width: 80rem;
            margin: 0 auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

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

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

        .site-header {
            position: sticky;
            top: 0;
            z-index: 70;
            height: 72px;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--line-soft);
            transition: box-shadow 0.3s ease;
        }

        .site-header.header-scrolled {
            box-shadow: 0 14px 38px rgba(5, 18, 32, 0.09);
        }

        .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 11px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            color: #ffffff;
            font-weight: 800;
            font-size: 14px;
            letter-spacing: -0.02em;
            box-shadow: 0 8px 18px rgba(14, 120, 240, 0.28);
            flex-shrink: 0;
        }

        .nav-link {
            position: relative;
            display: inline-flex;
            align-items: center;
            padding: 28px 2px 22px;
            font-size: 15px;
            font-weight: 600;
            color: #334B5C;
            white-space: nowrap;
            transition: color 0.24s ease;
        }

        .nav-link::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: 18px;
            height: 2px;
            background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
            border-radius: 999px;
            opacity: 0;
            transform: scaleX(0.4);
            transition: opacity 0.25s ease, transform 0.25s ease;
        }

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

        .nav-link:hover::after {
            opacity: 0.55;
            transform: scaleX(0.72);
        }

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

        .nav-link.active::after {
            opacity: 1;
            transform: scaleX(1);
        }

        .header-search {
            position: relative;
            width: 190px;
            height: 40px;
        }

        .header-search svg {
            position: absolute;
            left: 13px;
            top: 50%;
            transform: translateY(-50%);
            color: #8AA0B1;
            pointer-events: none;
        }

        .header-search input {
            width: 100%;
            height: 100%;
            border: 1px solid var(--line-soft);
            border-radius: 999px;
            background: #F4F7FA;
            padding: 0 14px 0 38px;
            font-size: 14px;
            color: var(--ink);
            transition: border-color 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
        }

        .header-search input::placeholder {
            color: #97AAB7;
        }

        .header-search input:focus {
            outline: none;
            background: #ffffff;
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(14, 120, 240, 0.12);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-weight: 600;
            font-size: 15px;
            line-height: 1;
            border: 1px solid transparent;
            border-radius: var(--radius-sm);
            padding: 11px 22px;
            cursor: pointer;
            transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
        }

        .btn:focus-visible,
        .nav-link:focus-visible,
        .footer-link:focus-visible,
        .breadcrumb a:focus-visible {
            outline: 3px solid rgba(14, 120, 240, 0.35);
            outline-offset: 3px;
        }

        .btn-primary {
            background: var(--primary);
            color: #ffffff;
            border-color: var(--primary);
            box-shadow: var(--shadow-btn);
        }

        .btn-primary:hover {
            background: #0B68D4;
            border-color: #0B68D4;
            transform: translateY(-2px);
            box-shadow: 0 14px 28px rgba(14, 120, 240, 0.36);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 6px 14px rgba(14, 120, 240, 0.3);
        }

        .btn-outline {
            background: #ffffff;
            border-color: #D7E1E9;
            color: #2A4155;
        }

        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 10px 24px rgba(14, 120, 240, 0.1);
        }

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

        .btn-white {
            background: #ffffff;
            color: var(--primary);
            box-shadow: 0 10px 26px rgba(5, 18, 32, 0.18);
        }

        .btn-white:hover {
            background: #EAF4FF;
            transform: translateY(-2px);
            box-shadow: 0 14px 30px rgba(5, 18, 32, 0.22);
        }

        .mobile-toggle {
            width: 42px;
            height: 42px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            border: 1px solid var(--line-soft);
            background: #ffffff;
            color: var(--ink);
            cursor: pointer;
            transition: background 0.2s ease, border-color 0.2s ease;
        }

        .mobile-toggle:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: #F0F7FF;
        }

        .mobile-nav-layer {
            position: fixed;
            inset: 0;
            z-index: 90;
            opacity: 0;
            visibility: hidden;
            transform: translateX(100%);
            transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
            background: rgba(5, 18, 32, 0.35);
            backdrop-filter: blur(2px);
        }

        .mobile-nav-layer.is-open {
            opacity: 1;
            visibility: visible;
            transform: translateX(0);
        }

        .mobile-panel {
            position: absolute;
            top: 0;
            right: 0;
            bottom: 0;
            width: min(86vw, 360px);
            background: #ffffff;
            border-radius: 24px 0 0 24px;
            padding: 24px 22px 34px;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
        }

        .mobile-panel .nav-list li a {
            display: flex;
            align-items: center;
            font-weight: 600;
            font-size: 17px;
            padding: 14px 10px;
            border-radius: 12px;
            color: #2A4155;
            transition: background 0.2s ease, color 0.2s ease;
        }

        .mobile-panel .nav-list li a:hover,
        .mobile-panel .nav-list li a.active {
            background: #EEF6FF;
            color: var(--primary);
        }

        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--ink-muted);
            line-height: 1.6;
        }

        .breadcrumb a {
            color: var(--primary);
            font-weight: 500;
            transition: color 0.2s ease;
        }

        .breadcrumb a:hover {
            color: #0A5FB5;
        }

        .breadcrumb .sep {
            color: #B9C9D4;
        }

        .article-card {
            background: var(--panel-light);
            border: 1px solid var(--line-soft);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            overflow: hidden;
        }

        .article-h1 {
            font-size: clamp(28px, 4vw, 40px);
            font-weight: 800;
            line-height: 1.32;
            letter-spacing: -0.02em;
            color: var(--ink);
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px;
            color: var(--ink-muted);
            font-size: 14px;
        }

        .article-meta .dot {
            width: 3px;
            height: 3px;
            border-radius: 99px;
            background: #B9C9D4;
        }

        .category-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            background: #E9F3FF;
            color: #0B61C9;
            font-size: 13px;
            font-weight: 600;
            border-radius: 999px;
            transition: background 0.2s ease, color 0.2s ease;
        }

        .category-badge:hover {
            background: #DBEDFF;
            color: #084A9C;
        }

        .article-cover {
            position: relative;
            overflow: hidden;
        }

        .article-cover img {
            width: 100%;
            height: 280px;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        @media (min-width: 640px) {
            .article-cover img {
                height: 380px;
            }
        }

        .article-cover::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(5, 18, 32, 0.02) 0%, rgba(5, 18, 32, 0.12) 100%);
            pointer-events: none;
        }

        .article-body {
            font-size: 17px;
            line-height: 1.95;
            color: #263E4C;
            word-break: break-word;
        }

        .article-body p {
            margin: 1.25em 0;
        }

        .article-body h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--ink);
            margin: 1.9em 0 0.7em;
            line-height: 1.4;
            letter-spacing: -0.01em;
        }

        .article-body h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--ink);
            margin: 1.5em 0 0.6em;
            line-height: 1.45;
        }

        .article-body h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            margin: 1.4em 0 0.5em;
        }

        .article-body strong {
            color: #102A38;
            font-weight: 700;
        }

        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 4px;
            text-decoration-color: rgba(14, 120, 240, 0.32);
            transition: color 0.2s ease, text-decoration-color 0.2s ease;
        }

        .article-body a:hover {
            color: #0A5FB5;
            text-decoration-color: currentColor;
        }

        .article-body ul,
        .article-body ol {
            margin: 1.4em 0;
            padding: 0;
        }

        .article-body ul li {
            position: relative;
            padding-left: 26px;
            margin: 0.55em 0;
        }

        .article-body ul li::before {
            content: "";
            position: absolute;
            left: 4px;
            top: 0.72em;
            width: 7px;
            height: 7px;
            border-radius: 2px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            transform: rotate(45deg);
        }

        .article-body ol {
            counter-reset: article-ol;
        }

        .article-body ol li {
            counter-increment: article-ol;
            position: relative;
            padding-left: 38px;
            margin: 0.55em 0;
        }

        .article-body ol li::before {
            content: counter(article-ol);
            position: absolute;
            left: 0;
            top: 0.3em;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            background: #E9F3FF;
            color: #0B61C9;
            font-size: 13px;
            font-weight: 700;
        }

        .article-body blockquote {
            margin: 1.8em 0;
            padding: 22px 24px;
            background: #F2FBF8;
            border-left: 4px solid var(--accent);
            border-radius: 0 16px 16px 0;
            color: #315764;
            position: relative;
        }

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

        .article-body img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-md);
            margin: 30px 0;
            box-shadow: 0 16px 36px rgba(5, 18, 32, 0.1);
        }

        .article-body hr {
            border: 0;
            height: 1px;
            background: var(--line-soft);
            margin: 2.2em 0;
        }

        .article-body pre {
            background: var(--bg-deep-dark);
            color: #D9E8F2;
            border-radius: 16px;
            padding: 22px 24px;
            overflow-x: auto;
            font-size: 14px;
            line-height: 1.75;
            margin: 1.8em 0;
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        .article-body code {
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
        }

        .article-body pre code {
            color: inherit;
            background: transparent;
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.8em 0;
            font-size: 15px;
            overflow: hidden;
            border-radius: 12px;
        }

        .article-body th,
        .article-body td {
            border: 1px solid var(--line-soft);
            padding: 12px 16px;
            text-align: left;
        }

        .article-body th {
            background: #F1F6FA;
            color: var(--ink);
            font-weight: 700;
        }

        .article-bottom-tools {
            border-top: 1px solid var(--line-soft);
        }

        .article-cta {
            background: linear-gradient(135deg, rgba(14, 120, 240, 0.06) 0%, rgba(27, 203, 156, 0.07) 100%);
            border: 1px solid #D9EAF7;
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            text-align: left;
        }

        @media (min-width: 640px) {
            .article-cta {
                padding: 42px 46px;
            }
        }

        .site-footer {
            background: var(--bg-dark);
            color: #ffffff;
            position: relative;
            overflow: hidden;
        }

        .site-footer::before {
            content: "";
            position: absolute;
            top: -80px;
            right: -40px;
            width: 320px;
            height: 320px;
            background: radial-gradient(circle, rgba(14, 120, 240, 0.2) 0%, rgba(14, 120, 240, 0) 70%);
            pointer-events: none;
        }

        .footer-link {
            color: #AFC4D6;
            font-size: 14px;
            transition: color 0.2s ease, padding-left 0.2s ease;
        }

        .footer-link:hover {
            color: #ffffff;
            padding-left: 5px;
        }

        .notfound-panel {
            background: #ffffff;
            border: 1px solid var(--line-soft);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            padding: 60px 24px;
            text-align: center;
        }

        .notfound-title {
            font-size: clamp(22px, 3vw, 30px);
            font-weight: 800;
            color: var(--ink);
            margin-bottom: 12px;
        }

        .section-padding {
            padding-top: 4rem;
            padding-bottom: 4rem;
        }

        @media (min-width: 768px) {
            .section-padding {
                padding-top: 5.5rem;
                padding-bottom: 5.5rem;
            }
        }

/* roulang page: category2 */
:root {
            --navy: #081A2E;
            --navy-deep: #051220;
            --navy-panel: #0D2438;
            --primary: #0E78F0;
            --accent: #1BCB9C;
            --amber: #F6B84B;
            --light-bg: #F4F7FA;
            --white: #FFFFFF;
            --ink: #122A38;
            --ink-2: #45626E;
            --border: #E3EAF0;
            --text-dark-bg: #E2ECF3;
            --radius-card: 16px;
            --radius-btn: 11px;
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: var(--font-family);
            background: var(--light-bg);
            color: var(--ink);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

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

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

        :focus-visible {
            outline: 3px solid rgba(14, 120, 240, .45);
            outline-offset: 2px;
        }

        .container {
            width: 100%;
            margin: 0 auto;
            max-width: 80rem;
            padding: 0 1rem;
        }

        @media (min-width: 640px) {
            .container {
                padding: 0 1.5rem;
            }
        }

        @media (min-width: 1024px) {
            .container {
                padding: 0 2rem;
            }
        }

        .header-wrap {
            position: sticky;
            top: 0;
            z-index: 60;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow .25s ease;
        }

        .header-scrolled {
            box-shadow: 0 12px 32px rgba(8, 26, 46, .07);
        }

        .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 34px;
            height: 34px;
            border-radius: 10px;
            background: linear-gradient(145deg, #0E78F0 0%, #0A4FA8 100%);
            color: #fff;
            font-size: 13px;
            font-weight: 800;
            letter-spacing: -.02em;
            box-shadow: 0 6px 18px rgba(14, 120, 240, .25);
        }

        .nav-link {
            font-size: 15px;
            font-weight: 600;
            color: #37506B;
            padding: 6px 2px;
            position: relative;
            transition: color .2s ease;
        }

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

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

        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            border-radius: 2px;
            background: var(--primary);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            padding: .8rem 1.4rem;
            border: 2px solid var(--primary);
            box-shadow: 0 0 0 0 rgba(14, 120, 240, 0), 0 8px 24px rgba(14, 120, 240, .22);
            transition: all .2s ease;
            cursor: pointer;
            white-space: nowrap;
        }

        .btn-primary:hover {
            background: #2B8BFF;
            border-color: #2B8BFF;
            box-shadow: 0 0 0 5px rgba(14, 120, 240, .1), 0 12px 28px rgba(14, 120, 240, .32);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(1px) scale(.98);
            box-shadow: 0 4px 12px rgba(14, 120, 240, .22);
        }

        .btn-ghost-dark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            background: transparent;
            color: #EAF2F9;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            padding: .8rem 1.4rem;
            border: 1.5px solid rgba(255, 255, 255, .6);
            transition: all .2s ease;
            white-space: nowrap;
        }

        .btn-ghost-dark:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, .12);
            color: #fff;
        }

        .btn-ghost-dark:active {
            transform: translateY(1px);
        }

        .btn-ghost-light {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            background: transparent;
            color: var(--ink);
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            padding: .8rem 1.4rem;
            border: 1.5px solid #B8C8D9;
            transition: all .2s ease;
            white-space: nowrap;
        }

        .btn-ghost-light:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(14, 120, 240, .05);
        }

        .btn-ghost-light:active {
            transform: translateY(1px);
        }

        .search-field {
            display: flex;
            align-items: center;
            background: #F2F6FA;
            border: 1.5px solid transparent;
            border-radius: 999px;
            padding: 0 8px 0 14px;
            min-height: 42px;
            width: 210px;
            transition: all .2s ease;
        }

        .search-field:focus-within {
            width: 240px;
            background: #fff;
            border-color: var(--primary);
            box-shadow: 0 0 0 4px rgba(14, 120, 240, .1);
        }

        .search-field input {
            width: 100%;
            border: none;
            outline: none;
            background: transparent;
            font-size: 14px;
            color: var(--ink);
            padding-right: 4px;
        }

        .search-icon-btn {
            width: 30px;
            height: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            background: transparent;
            border: 0;
            border-radius: 50%;
            cursor: pointer;
            transition: background .2s;
        }

        .search-icon-btn:hover {
            background: rgba(14, 120, 240, .1);
        }

        .mobile-panel {
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 18px 18px 24px;
        }

        .mobile-panel a {
            display: block;
            padding: 12px 10px;
            border-radius: 10px;
            font-weight: 600;
            color: var(--ink);
            transition: background .2s;
        }

        .mobile-panel a:hover {
            background: #F2F6FA;
        }

        .mobile-panel a.active {
            color: var(--primary);
            background: rgba(14, 120, 240, .08);
        }

        .section {
            padding: 5rem 0;
        }

        @media (min-width: 768px) {
            .section {
                padding: 7rem 0;
            }
        }

        .section-eyebrow,
        .hero-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            color: var(--primary);
            background: rgba(14, 120, 240, .08);
            border-radius: 999px;
            padding: .3rem .9rem;
            font-size: 13px;
            font-weight: 700;
            letter-spacing: .02em;
        }

        .hero-eyebrow {
            background: rgba(255, 255, 255, .09);
            color: #DCECFF;
            border: 1px solid rgba(255, 255, 255, .1);
            backdrop-filter: blur(8px);
        }

        .section-title {
            font-size: 2.2rem;
            line-height: 1.25;
            color: var(--ink);
            font-weight: 800;
            letter-spacing: -.02em;
            margin: 0 0 .75rem;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--ink-2);
            margin: 0;
        }

        .glass-card {
            background: rgba(255, 255, 255, .06);
            border: 1px solid rgba(255, 255, 255, .12);
            border-radius: 22px;
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            transition: transform .22s ease, border-color .22s ease;
        }

        .glass-card:hover {
            transform: translateY(-2px);
            border-color: rgba(255, 255, 255, .28);
        }

        .light-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            box-shadow: 0 8px 24px rgba(8, 26, 46, .04);
            transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
        }

        .light-card:hover {
            transform: translateY(-3px);
            border-color: rgba(14, 120, 240, .3);
            box-shadow: 0 18px 34px rgba(8, 26, 46, .08);
        }

        .step-line {
            position: relative;
            padding-left: 3rem;
        }

        .step-line:before {
            content: "";
            position: absolute;
            left: .9rem;
            top: 2.4rem;
            bottom: -1rem;
            width: 1px;
            background: #E1E9F2;
        }

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

        .step-num {
            position: absolute;
            left: 0;
            top: .2rem;
            width: 2rem;
            height: 2rem;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            font-weight: 800;
            box-shadow: 0 0 0 5px rgba(14, 120, 240, .13);
        }

        .tag-chip {
            display: inline-flex;
            align-items: center;
            gap: .4rem;
            border-radius: 999px;
            padding: .25rem .7rem;
            font-size: 13px;
            font-weight: 600;
            background: rgba(14, 120, 240, .08);
            color: #0B62C5;
        }

        .tag-chip.green {
            background: rgba(27, 203, 156, .12);
            color: #159A76;
        }

        .tag-chip.gold {
            background: rgba(246, 184, 75, .14);
            color: #B5770F;
        }

        .faq-item {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 14px;
            overflow: hidden;
            transition: border-color .2s ease;
        }

        .faq-item.open {
            border-color: rgba(14, 120, 240, .35);
        }

        .faq-btn {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 1.05rem 1.2rem;
            cursor: pointer;
            background: none;
            border: 0;
            font-size: 1rem;
            font-weight: 700;
            color: var(--ink);
            text-align: left;
            gap: 1rem;
            width: 100%;
        }

        .faq-icon {
            width: 26px;
            height: 26px;
            flex: none;
            border-radius: 50%;
            background: rgba(14, 120, 240, .08);
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: transform .25s;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .3s ease;
        }

        .faq-answer div {
            padding: 0 1.2rem 1.2rem;
            font-size: 15px;
            color: var(--ink-2);
            line-height: 1.75;
        }

        .footer-link {
            color: #AFC4D6;
            font-size: 14px;
            transition: color .2s;
        }

        .footer-link:hover {
            color: #fff;
        }

        .bottom-bar {
            position: fixed;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: 90;
            transform: translateY(120%);
            transition: transform .3s ease, opacity .3s ease;
            background: rgba(8, 26, 46, .86);
            backdrop-filter: blur(20px);
            border-top: 1px solid rgba(255, 255, 255, .14);
            padding: .7rem 0 .8rem;
            color: #fff;
        }

        .bottom-bar.visible {
            transform: translateY(0);
            opacity: 1;
        }

        @media (max-width: 640px) {
            .bottom-bar .bar-text {
                display: none;
            }
            .bottom-bar .bar-cta {
                width: 100%;
                justify-content: space-between;
            }
        }

        .hero-bg,
        .dark-bg {
            background-color: var(--navy);
            background-image: radial-gradient(800px 400px at 10% -10%, rgba(14, 120, 240, .2), transparent 60%), radial-gradient(700px 360px at 90% 20%, rgba(27, 203, 156, .1), transparent 55%);
        }

/* roulang page: category3 */
:root {
            --c-primary: #0E78F0;
            --c-primary-hover: #0b67d4;
            --c-accent: #1BCB9C;
            --c-warn: #F6B84B;
            --c-deep: #081A2E;
            --c-deeper: #051220;
            --c-panel: #0D2438;
            --c-body: #122A38;
            --c-soft: #5A7184;
            --c-line: #E3EAF0;
            --c-bg-soft: #F4F7FA;
            --c-deep-text: #E2ECF3;
            --shadow-card: 0 10px 28px rgba(8, 26, 46, .05);
            --shadow-card-hover: 0 18px 38px rgba(8, 26, 46, .10);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: #ffffff;
            color: var(--c-body);
            line-height: 1.75;
        }

        * {
            box-sizing: border-box;
        }

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

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

        button,
        input {
            font: inherit;
        }

        .logo-mark {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(145deg, #176EE8, #0A5FC3);
            color: #fff;
            font-weight: 800;
            letter-spacing: .02em;
            box-shadow: 0 8px 20px rgba(14, 120, 240, .32);
        }

        .nav-link {
            position: relative;
            display: inline-flex;
            align-items: center;
            height: 68px;
            font-size: 15px;
            font-weight: 600;
            color: #2B4C60;
            transition: color .2s ease;
        }

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

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

        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 8px;
            right: 8px;
            bottom: 14px;
            height: 2px;
            border-radius: 2px;
            background: var(--c-primary);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: 10px;
            background-color: #0E78F0;
            padding: 10px 22px;
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            box-shadow: 0 8px 22px rgba(14, 120, 240, .35);
            transition: all .25s ease;
        }

        .btn-primary:hover {
            background-color: #0b67d4;
            box-shadow: 0 12px 30px rgba(14, 120, 240, .46);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 6px 16px rgba(14, 120, 240, .28);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: 10px;
            border: 1px solid rgba(255, 255, 255, .7);
            padding: 10px 22px;
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            background: rgba(255, 255, 255, .06);
            backdrop-filter: blur(8px);
            transition: all .25s ease;
        }

        .btn-outline:hover {
            border-color: rgba(255, 255, 255, .95);
            background: rgba(255, 255, 255, .14);
            transform: translateY(-1px);
        }

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

        .glass-card {
            background: rgba(255, 255, 255, .07);
            border: 1px solid rgba(255, 255, 255, .14);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
        }

        .card-lift {
            transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
        }

        .card-lift:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-card-hover);
            border-color: rgba(14, 120, 240, .25);
        }

        .page-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            border-radius: 999px;
            background: #EDF4FF;
            color: #0E78F0;
            padding: 4px 12px;
            font-size: 12px;
            font-weight: 600;
        }

        .footer-link {
            color: #AFC4D6;
            transition: color .2s ease;
            font-size: 14px;
            line-height: 1.7;
        }

        .footer-link:hover {
            color: #fff;
        }

        details summary::-webkit-details-marker {
            display: none;
        }

        details summary {
            list-style: none;
        }

        .faq-plus {
            transition: transform .25s ease;
        }

        details[open] .faq-plus {
            transform: rotate(45deg);
        }

        header.scrolled {
            box-shadow: 0 10px 28px rgba(8, 26, 46, .08);
        }

        .timeline-dot {
            position: absolute;
            left: 0;
            top: 4px;
            width: 20px;
            height: 20px;
            border-radius: 999px;
            background: #ffffff;
            border: 3px solid #1BCB9C;
            box-shadow: 0 0 0 5px rgba(27, 203, 156, .13);
        }

        @media (max-width: 640px) {
            .btn-primary,
            .btn-outline {
                width: 100%;
            }
        }