/* roulang page: index */
:root {
            --primary: #1B3A5C;
            --primary-hover: #142C46;
            --secondary: #2F6E8C;
            --accent: #E8A33C;
            --accent-hover: #d6932e;
            --bg-main: #FFFFFF;
            --bg-content: #F4F6F8;
            --bg-info: #EAF0F4;
            --text-dark: #142433;
            --text-muted: #52687A;
            --border-color: #D9E1E8;
            --radius-lg: 12px;
            --radius-md: 8px;
            --radius-sm: 6px;
            --shadow-default: 0 1px 3px rgba(20, 36, 51, 0.06), 0 4px 12px rgba(20, 36, 51, 0.04);
            --shadow-hover: 0 6px 16px rgba(27, 58, 92, 0.10), 0 2px 6px rgba(20, 36, 51, 0.06);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-sans);
            color: var(--text-dark);
            background: var(--bg-main);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
            height: auto;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
        }
        input {
            font-family: inherit;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        .section-padding {
            padding-top: 88px;
            padding-bottom: 88px;
        }
        .section-title {
            font-size: clamp(26px, 2.8vw, 36px);
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.01em;
            margin-bottom: 16px;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 620px;
            line-height: 1.8;
        }
        .text-muted {
            color: var(--text-muted);
        }
        .bg-content {
            background: var(--bg-content);
        }
        .bg-info {
            background: var(--bg-info);
        }
        .btn-primary {
            background-color: var(--primary);
            color: #fff;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(27, 58, 92, 0.2);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-secondary {
            background: transparent;
            border: 1px solid var(--border-color);
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 15px;
            transition: background-color 0.2s ease, border-color 0.2s ease;
        }
        .btn-secondary:hover {
            background: rgba(27, 58, 92, 0.05);
            border-color: var(--primary);
        }
        .btn-accent {
            background-color: var(--accent);
            color: #fff;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            font-weight: 700;
            font-size: 16px;
            transition: background-color 0.2s ease, transform 0.2s ease;
            border: none;
            cursor: pointer;
        }
        .btn-accent:hover {
            background-color: var(--accent-hover);
            transform: translateY(-2px);
        }
        .card {
            background: #fff;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-default);
            transition: box-shadow 0.25s ease, transform 0.25s ease;
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-2px);
        }
        .tag {
            display: inline-block;
            background: var(--bg-info);
            color: var(--secondary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 999px;
            letter-spacing: 0.02em;
        }
        .tag-accent {
            background: rgba(232, 163, 60, 0.15);
            color: #b57f1f;
        }
        .list-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border-color);
            transition: background-color 0.2s;
        }
        .list-item:last-child {
            border-bottom: none;
        }
        .list-item:hover {
            background: rgba(244, 246, 248, 0.6);
        }
        .list-item .content {
            flex: 1;
        }
        .badge {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: var(--radius-sm);
            background: var(--bg-info);
            color: var(--secondary);
            margin-bottom: 8px;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: 16px 0;
        }
        .faq-item:first-child {
            border-top: 1px solid var(--border-color);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            padding: 12px 0;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            text-align: left;
            cursor: pointer;
            transition: color 0.2s;
            min-height: 44px;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question .icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: var(--bg-info);
            transition: transform 0.3s ease, background-color 0.3s;
            color: var(--primary);
            font-size: 18px;
        }
        .faq-item.active .icon {
            transform: rotate(45deg);
            background: var(--primary);
            color: #fff;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.75;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding-bottom: 16px;
        }
        .header-bg {
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid #E2E8F0;
        }
        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-dark);
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            transition: background-color 0.2s, color 0.2s;
        }
        .nav-link:hover {
            background: rgba(27, 58, 92, 0.06);
            color: var(--primary);
        }
        .nav-link.active {
            color: var(--primary);
            font-weight: 700;
            background: rgba(27, 58, 92, 0.08);
        }
        .footer-link {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
            line-height: 2.2;
            transition: color 0.2s;
        }
        .footer-link:hover {
            color: var(--accent);
        }
        .trust-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .stat-number {
            font-size: clamp(36px, 3vw, 48px);
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            font-feature-settings: "tnum";
        }
        .stat-label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 4px;
        }
        .mobile-tab a {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2px;
            font-size: 11px;
            color: var(--text-muted);
            transition: color 0.2s;
            padding: 6px 0;
        }
        .mobile-tab a.active {
            color: var(--primary);
            font-weight: 700;
        }
        .mobile-tab a svg {
            width: 22px;
            height: 22px;
        }
        @media (max-width: 1023px) {
            .desktop-nav {
                display: none !important;
            }
            .mobile-menu-btn {
                display: flex !important;
            }
            .section-padding {
                padding-top: 56px;
                padding-bottom: 56px;
            }
        }
        @media (min-width: 1024px) {
            .mobile-menu-btn {
                display: none !important;
            }
            .mobile-nav-drawer {
                display: none !important;
            }
            .mobile-bottom-tab {
                display: none !important;
            }
        }
        @media (max-width: 639px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .stat-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .section-padding {
                padding-top: 48px;
                padding-bottom: 48px;
            }
            .faq-answer {
                font-size: 14px;
            }
        }
        .hero-bg {
            background: linear-gradient(135deg, #FFFFFF 0%, #F4F6F8 100%);
            position: relative;
            overflow: hidden;
        }
        .hero-bg::before {
            content: '';
            position: absolute;
            top: -10%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(232, 163, 60, 0.08) 0%, transparent 70%);
            border-radius: 50%;
        }
        .img-wave {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-hover);
        }
        .focus-ring {
            outline: none;
        }
        .focus-ring:focus-visible {
            outline: 2px solid #68A3C8;
            outline-offset: 2px;
        }
        .timeline-item {
            position: relative;
            padding-left: 32px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 8px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--accent);
        }
        .timeline-item::after {
            content: '';
            position: absolute;
            left: 5px;
            top: 30px;
            width: 2px;
            bottom: -10px;
            background: var(--border-color);
        }
        .timeline-item:last-child::after {
            display: none;
        }
        .process-step {
            text-align: center;
            position: relative;
        }
        .process-step .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            margin: 0 auto 16px;
        }
        .process-line {
            position: absolute;
            top: 24px;
            left: calc(50% + 40px);
            right: calc(-50% + 40px);
            height: 2px;
            background: var(--border-color);
        }
        @media (max-width: 767px) {
            .process-line {
                display: none;
            }
        }
        .cta-section {
            background: var(--primary);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(232, 163, 60, 0.1) 0%, transparent 60%);
            border-radius: 50%;
        }
        .mobile-nav-drawer {
            position: fixed;
            top: 0;
            right: 0;
            height: 100%;
            width: 280px;
            max-width: 80%;
            background: #fff;
            z-index: 1000;
            box-shadow: -4px 0 20px rgba(0, 0, 0, 0.08);
            padding: 24px;
            display: flex;
            flex-direction: column;
            transform: translateX(100%);
            transition: transform 0.3s ease;
        }
        .mobile-nav-drawer.open {
            transform: translateX(0);
        }
        .mobile-nav-drawer a {
            font-size: 16px;
            padding: 14px 8px;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-dark);
            transition: background-color 0.2s;
        }
        .mobile-nav-drawer a:hover {
            background: var(--bg-content);
        }
        .drawer-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.4);
            z-index: 999;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s;
        }
        .drawer-overlay.open {
            opacity: 1;
            visibility: visible;
        }
        .mobile-bottom-tab {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: #fff;
            border-top: 1px solid var(--border-color);
            display: flex;
            justify-content: space-around;
            padding-bottom: env(safe-area-inset-bottom);
            z-index: 500;
            height: 60px;
        }

/* roulang page: category1 */
:root{
    --primary:#1B3A5C;
    --secondary:#2F6E8C;
    --accent:#E8A33C;
    --bg-soft:#F4F6F8;
    --bg-info:#EAF0F4;
    --text-main:#142433;
    --text-sub:#52687A;
    --border:#D9E1E8;
    --radius-card:12px;
    --radius-btn:8px;
    --shadow-card:0 1px 3px rgba(20,36,51,.06),0 4px 12px rgba(20,36,51,.04);
    --shadow-hover:0 6px 16px rgba(27,58,92,.10),0 2px 6px rgba(20,36,51,.06);
    --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{
    font-family:var(--font-sans);
    color:var(--text-main);
    background:#fff;
    line-height:1.7;
    -webkit-font-smoothing:antialiased;
  }
  a{color:inherit;text-decoration:none}
  img{max-width:100%;display:block}
  button{font-family:inherit;cursor:pointer;border:none;background:none}
  .container{max-width:1200px;margin:0 auto;padding-left:20px;padding-right:20px}
  .header-bg{
    background:rgba(255,255,255,.85);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    border-bottom:1px solid #E2E8F0;
  }
  .focus-ring:focus-visible{
    outline:2px solid #68A3C8;
    outline-offset:2px;
    border-radius:4px;
  }
  .nav-link{
    font-size:15px;
    font-weight:500;
    color:var(--text-sub);
    padding:8px 16px;
    border-radius:8px;
    transition:color .2s,background .2s;
    line-height:1.4;
  }
  .nav-link:hover{color:var(--primary);background:#F1F5F9}
  .nav-link.active{color:var(--primary);font-weight:700;background:rgba(27,58,92,.06)}
  .btn-primary{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    background:var(--primary);
    color:#fff;
    font-weight:600;
    border-radius:8px;
    padding:12px 28px;
    transition:background .2s,transform .2s,box-shadow .2s;
    box-shadow:0 2px 8px rgba(27,58,92,.18);
  }
  .btn-primary:hover{
    background:#142C46;
    transform:translateY(-2px);
    box-shadow:0 6px 18px rgba(27,58,92,.22);
  }
  .btn-primary:active{transform:translateY(0);box-shadow:0 2px 6px rgba(27,58,92,.15)}
  .btn-outline{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    background:transparent;
    border:1px solid var(--primary);
    color:var(--primary);
    font-weight:600;
    border-radius:8px;
    padding:12px 28px;
    transition:background .2s,transform .2s,border-color .2s;
  }
  .btn-outline:hover{background:rgba(27,58,92,.06);border-color:#142C46;transform:translateY(-2px)}
  .btn-accent{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    background:var(--accent);
    color:#142433;
    font-weight:700;
    border-radius:8px;
    padding:14px 36px;
    transition:background .2s,transform .2s,box-shadow .2s;
    box-shadow:0 4px 14px rgba(232,163,60,.28);
  }
  .btn-accent:hover{background:#d4922c;transform:translateY(-2px);box-shadow:0 8px 22px rgba(232,163,60,.34)}
  .section-padding{padding:88px 0}
  .section-header{margin-bottom:48px}
  .section-eyebrow{
    font-size:13px;
    font-weight:600;
    letter-spacing:.06em;
    color:var(--secondary);
    text-transform:uppercase;
    display:block;
    margin-bottom:8px;
  }
  .section-title{
    font-size:clamp(24px,2.8vw,36px);
    font-weight:800;
    line-height:1.25;
    letter-spacing:-.01em;
    color:var(--text-main);
  }
  .section-desc{
    font-size:15px;
    color:var(--text-sub);
    max-width:720px;
    margin-top:16px;
    line-height:1.7;
  }
  .badge{
    display:inline-flex;
    align-items:center;
    gap:6px;
    font-size:13px;
    font-weight:500;
    padding:4px 12px;
    border-radius:999px;
    background:var(--bg-info);
    color:var(--secondary);
  }
  .badge-accent{
    background:rgba(232,163,60,.14);
    color:#b97b1f;
  }
  .card-base{
    background:#fff;
    border-radius:var(--radius-card);
    box-shadow:var(--shadow-card);
    transition:box-shadow .3s,transform .3s;
  }
  .card-base:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
  .faq-item{
    border-bottom:1px solid var(--border);
  }
  .faq-item:first-child{border-top:1px solid var(--border)}
  .faq-question{
    width:100%;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:16px;
    padding:20px 8px;
    font-size:16px;
    font-weight:600;
    color:var(--text-main);
    text-align:left;
    transition:color .2s;
    min-height:44px;
  }
  .faq-question:hover{color:var(--primary)}
  .faq-question .icon{
    flex-shrink:0;
    width:24px;height:24px;
    display:flex;align-items:center;justify-content:center;
    border-radius:50%;
    background:var(--bg-info);
    color:var(--secondary);
    font-size:14px;
    transition:transform .3s,background .3s,color .3s;
  }
  .faq-item.open .faq-question .icon{
    transform:rotate(45deg);
    background:var(--primary);
    color:#fff;
  }
  .faq-answer{
    max-height:0;
    overflow:hidden;
    transition:max-height .35s ease;
  }
  .faq-answer-inner{
    padding:0 8px 20px;
    font-size:15px;
    color:var(--text-sub);
    line-height:1.75;
  }
  .footer-link{
    color:rgba(255,255,255,.65);
    font-size:14px;
    transition:color .2s;
    display:inline-block;
    padding:4px 0;
  }
  .footer-link:hover{color:var(--accent)}
  .mobile-tab-bar{
    position:fixed;
    bottom:0;left:0;right:0;
    z-index:100;
    background:rgba(255,255,255,.96);
    backdrop-filter:blur(12px);
    border-top:1px solid #E2E8F0;
    display:flex;
    justify-content:space-around;
    align-items:center;
    height:56px;
    padding-bottom:env(safe-area-inset-bottom);
    display:none;
  }
  .mobile-tab-item{
    display:flex;flex-direction:column;align-items:center;justify-content:center;
    font-size:11px;color:var(--text-sub);
    gap:2px;padding:4px 0;
    transition:color .2s;flex:1;
  }
  .mobile-tab-item.active{color:var(--primary);font-weight:600}
  .mobile-menu-panel{
    position:fixed;
    top:0;right:0;
    width:280px;
    height:100%;
    background:#fff;
    z-index:200;
    box-shadow:-8px 0 24px rgba(20,36,51,.12);
    transform:translateX(100%);
    transition:transform .3s ease;
    display:flex;
    flex-direction:column;
    padding:24px;
  }
  .mobile-menu-panel.open{transform:translateX(0)}
  .mobile-menu-panel a{
    font-size:16px;
    padding:14px 0;
    border-bottom:1px solid #F1F5F9;
    color:var(--text-main);
    font-weight:500;
  }
  .mobile-menu-panel a.active{color:var(--primary);font-weight:700}
  .hero-bg{
    background:
      linear-gradient(100deg,rgba(255,255,255,.96) 20%,rgba(255,255,255,.88) 55%,rgba(244,246,248,.92) 100%),
      url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  }
  .stat-card{
    background:#fff;
    border-radius:var(--radius-card);
    padding:24px;
    text-align:center;
    box-shadow:var(--shadow-card);
    transition:transform .3s,box-shadow .3s;
  }
  .stat-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
  .stat-number{
    font-size:clamp(32px,4vw,46px);
    font-weight:800;
    color:var(--primary);
    line-height:1.2;
    font-variant-numeric:tabular-nums;
  }
  .stat-label{font-size:14px;color:var(--text-sub);margin-top:8px}
  .capability-item{
    display:flex;
    gap:20px;
    padding:28px 24px;
    border-bottom:1px solid var(--border);
    transition:background .2s;
  }
  .capability-item:hover{background:#FAFBFC}
  .capability-item:first-child{border-top:1px solid var(--border)}
  .capability-icon{
    flex-shrink:0;
    width:48px;height:48px;
    border-radius:10px;
    background:var(--bg-info);
    color:var(--primary);
    display:flex;align-items:center;justify-content:center;
    font-size:20px;
  }
  .step-item{
    position:relative;
    padding:32px 24px;
    background:#fff;
    border-radius:var(--radius-card);
    box-shadow:var(--shadow-card);
    transition:transform .3s,box-shadow .3s;
    border-top:3px solid var(--accent);
  }
  .step-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
  .step-number{
    display:inline-flex;
    align-items:center;justify-content:center;
    width:36px;height:36px;
    border-radius:50%;
    background:var(--primary);
    color:#fff;
    font-weight:800;
    font-size:16px;
    margin-bottom:16px;
  }
  .resource-card{
    background:#fff;
    border-radius:var(--radius-card);
    overflow:hidden;
    box-shadow:var(--shadow-card);
    transition:transform .3s,box-shadow .3s;
    display:block;
  }
  .resource-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
  .resource-card .img-wrap{
    height:180px;
    background:var(--bg-info);
    position:relative;
    overflow:hidden;
  }
  .resource-card .img-wrap img{
    width:100%;height:100%;object-fit:cover;
    transition:transform .4s;
  }
  .resource-card:hover .img-wrap img{transform:scale(1.05)}
  .cta-section{
    background:
      linear-gradient(120deg,rgba(27,58,92,.96),rgba(47,110,140,.94)),
      url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
    border-radius:0;
  }
  .form-input{
    width:100%;
    height:44px;
    padding:0 14px;
    border:1px solid #CAD4DE;
    border-radius:8px;
    font-size:14px;
    font-family:inherit;
    color:var(--text-main);
    transition:border-color .2s,box-shadow .2s;
    background:#fff;
  }
  .form-input:focus{
    outline:none;
    border-color:var(--primary);
    box-shadow:0 0 0 3px rgba(27,58,92,.10);
  }
  textarea.form-input{
    height:auto;
    min-height:96px;
    padding:12px 14px;
    resize:vertical;
  }
  .form-label{
    display:block;
    font-size:13px;
    font-weight:600;
    color:var(--text-main);
    margin-bottom:6px;
  }
  @media (max-width:1023px){
    .section-padding{padding:64px 0}
    .desktop-nav{display:none}
    .mobile-tab-bar{display:flex}
    main{padding-bottom:72px}
  }
  @media (max-width:767px){
    .section-padding{padding:48px 0}
    .section-header{margin-bottom:32px}
    .hero-bg{
      background:
        linear-gradient(180deg,rgba(255,255,255,.96) 0%,rgba(255,255,255,.90) 60%,rgba(244,246,248,.96) 100%),
        url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
    }
    .capability-item{gap:14px;padding:22px 16px}
    .step-item{padding:24px 20px}
  }
  @media (min-width:1024px){
    .mobile-tab-bar{display:none}
  }
  .img-frame{
    border-radius:12px;
    overflow:hidden;
    box-shadow:var(--shadow-card);
    transition:box-shadow .3s;
  }
  .img-frame:hover{box-shadow:var(--shadow-hover)}
  .text-fade{color:var(--text-sub)}
  .bg-soft{background:var(--bg-soft)}
  .bg-info{background:var(--bg-info)}

  /* 装饰 */
  .hero-deco{
    position:absolute;
    border-radius:50%;
    background:rgba(47,110,140,.06);
    pointer-events:none;
  }

  /* 时间线 */
  .timeline-line{
    position:relative;
  }
  .timeline-line::before{
    content:'';
    position:absolute;
    left:19px;
    top:0;
    bottom:0;
    width:2px;
    background:var(--border);
  }
  @media (min-width:768px){
    .timeline-line::before{left:50%;margin-left:-1px}
  }

/* roulang page: article */
:root {
            --primary: #1B3A5C;
            --primary-dark: #142C46;
            --secondary: #2F6E8C;
            --accent: #E8A33C;
            --text-main: #142433;
            --text-sub: #52687A;
            --bg-light: #F4F6F8;
            --bg-lighter: #EAF0F4;
            --border: #D9E1E8;
            --radius-lg: 12px;
            --radius-md: 8px;
            --radius-sm: 6px;
            --shadow-card: 0 1px 3px rgba(20,36,51,0.06), 0 4px 12px rgba(20,36,51,0.04);
            --shadow-hover: 0 6px 16px rgba(27,58,92,0.10), 0 2px 6px rgba(20,36,51,0.06);
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
            color: var(--text-main);
            background: #fff;
            font-size: 16px;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        img {
            max-width: 100%;
            display: block;
        }
        ul,
        ol {
            list-style: none;
        }
        button {
            font-family: inherit;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        .header-bg {
            background: rgba(255, 255, 255, .85);
            -webkit-backdrop-filter: blur(12px);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid #E2E8F0;
        }
        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-sub);
            padding: 8px 14px;
            border-radius: var(--radius-md);
            transition: color .2s, background .2s;
            display: inline-block;
        }
        .nav-link:hover {
            color: var(--primary);
            background: rgba(27, 58, 92, .06);
        }
        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            left: 14px;
            right: 14px;
            bottom: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            border-radius: var(--radius-md);
            padding: 10px 20px;
            border: none;
            cursor: pointer;
            transition: all .2s ease;
            text-align: center;
            box-shadow: 0 2px 6px rgba(27, 58, 92, .18);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(27, 58, 92, .25);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 6px rgba(27, 58, 92, .18);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            color: var(--primary);
            font-weight: 600;
            border-radius: var(--radius-md);
            padding: 9px 20px;
            border: 1px solid var(--primary);
            cursor: pointer;
            transition: all .2s ease;
            font-size: 14px;
        }
        .btn-outline:hover {
            background: rgba(27, 58, 92, .06);
        }
        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--accent);
            color: #fff;
            font-weight: 600;
            border-radius: var(--radius-md);
            padding: 12px 28px;
            border: none;
            cursor: pointer;
            transition: all .2s ease;
            box-shadow: 0 4px 14px rgba(232, 163, 60, .35);
            font-size: 15px;
        }
        .btn-accent:hover {
            background: #d18c2a;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(232, 163, 60, .4);
        }
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid #68A3C8;
            outline-offset: 2px;
        }
        .footer-link {
            color: rgba(255, 255, 255, .6);
            font-size: 14px;
            transition: color .2s ease;
            line-height: 2;
        }
        .footer-link:hover {
            color: var(--accent);
        }
        .badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 6px;
            font-size: 13px;
            font-weight: 500;
            background: var(--bg-lighter);
            color: var(--secondary);
        }
        .badge-accent {
            background: rgba(232, 163, 60, .15);
            color: #c77a1a;
        }
        .page-hero {
            padding: 130px 0 48px;
            background: linear-gradient(rgba(255, 255, 255, .92), rgba(255, 255, 255, .94)), url('/assets/images/backpic/back-1.webp') center / cover no-repeat;
            border-bottom: 1px solid var(--border);
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            font-size: 14px;
            color: var(--text-sub);
            margin-bottom: 20px;
            gap: 6px;
        }
        .breadcrumb a {
            color: var(--text-sub);
            transition: color .2s;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: #a0b0bc;
            margin: 0 2px;
        }
        .breadcrumb .current {
            color: var(--text-main);
            font-weight: 500;
            display: inline-block;
            max-width: 320px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .article-title {
            font-size: clamp(28px, 4vw, 40px);
            font-weight: 800;
            line-height: 1.24;
            letter-spacing: -0.01em;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .meta-info {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 14px;
            font-size: 14px;
            color: var(--text-sub);
        }
        .meta-info .date {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .meta-info .date svg {
            width: 15px;
            height: 15px;
            stroke: currentColor;
        }
        .article-section {
            padding: 56px 0 64px;
            background: #fff;
        }
        .article-wrap {
            max-width: 780px;
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        .article-body {
            font-size: 16px;
            line-height: 1.85;
            color: var(--text-main);
        }
        .article-body h2 {
            font-size: 24px;
            font-weight: 700;
            margin: 36px 0 16px;
            color: var(--primary);
            line-height: 1.4;
        }
        .article-body h3 {
            font-size: 19px;
            font-weight: 600;
            margin: 28px 0 12px;
            color: var(--text-main);
        }
        .article-body p {
            margin-bottom: 20px;
        }
        .article-body ul,
        .article-body ol {
            margin: 0 0 22px;
            padding-left: 24px;
        }
        .article-body ul li {
            list-style: disc;
            margin-bottom: 8px;
        }
        .article-body ol li {
            list-style: decimal;
            margin-bottom: 8px;
        }
        .article-body blockquote {
            border-left: 4px solid var(--accent);
            padding: 14px 20px;
            background: var(--bg-light);
            border-radius: 0 8px 8px 0;
            margin: 24px 0;
            color: var(--text-sub);
            font-style: normal;
        }
        .article-body img {
            border-radius: var(--radius-lg);
            margin: 24px 0;
        }
        .article-body a {
            color: var(--secondary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-body pre {
            background: #1e293b;
            color: #e2e8f0;
            padding: 20px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            font-size: 14px;
            line-height: 1.6;
            margin: 20px 0;
        }
        .article-body code {
            background: rgba(27, 58, 92, .08);
            padding: 2px 6px;
            border-radius: 4px;
            font-size: 14px;
            font-family: "SF Mono", "Fira Code", "Consolas", monospace;
        }
        .article-body pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 15px;
        }
        .article-body th,
        .article-body td {
            border: 1px solid var(--border);
            padding: 10px 14px;
            text-align: left;
        }
        .article-body th {
            background: var(--bg-light);
            font-weight: 600;
            color: var(--primary);
        }
        .empty-state {
            text-align: center;
            padding: 64px 24px;
            background: var(--bg-light);
            border-radius: var(--radius-lg);
        }
        .empty-state h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .empty-state p {
            color: var(--text-sub);
            margin-bottom: 24px;
        }
        .article-pager {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            margin-top: 40px;
            padding-top: 28px;
            border-top: 1px solid var(--border);
            flex-wrap: wrap;
        }
        .pager-btn {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 8px 16px;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            font-size: 14px;
            color: var(--text-sub);
            transition: all .2s;
        }
        .pager-btn:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(27, 58, 92, .04);
        }
        .back-btn {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            padding: 8px 12px;
            border-radius: var(--radius-md);
            transition: background .2s;
        }
        .back-btn:hover {
            background: rgba(27, 58, 92, .06);
        }
        .related-section {
            background: var(--bg-light);
            padding: 72px 0;
        }
        .related-card {
            background: #fff;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: box-shadow .3s ease, transform .3s ease;
            height: 100%;
        }
        .related-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .related-img {
            background: var(--bg-lighter);
            aspect-ratio: 16 / 10;
            overflow: hidden;
        }
        .related-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }
        .related-card:hover .related-img img {
            transform: scale(1.04);
        }
        .cta-section {
            background: var(--primary);
            color: #fff;
            padding: 56px 0;
        }
        .cta-section h2 {
            font-size: clamp(24px, 3vw, 34px);
            font-weight: 800;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255, 255, 255, .78);
            max-width: 560px;
            margin: 0 auto 28px;
            font-size: 15px;
        }
        .mobile-drawer {
            position: fixed;
            top: 0;
            right: -100%;
            width: 280px;
            height: 100vh;
            background: #fff;
            z-index: 110;
            transition: right .3s ease;
            box-shadow: -4px 0 20px rgba(0, 0, 0, .1);
            padding: 24px;
            display: flex;
            flex-direction: column;
        }
        .mobile-drawer.open {
            right: 0;
        }
        .mobile-drawer-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(20, 36, 51, .4);
            z-index: 100;
            opacity: 0;
            visibility: hidden;
            transition: all .3s ease;
        }
        .mobile-drawer-overlay.open {
            opacity: 1;
            visibility: visible;
        }
        .mobile-nav-link {
            display: block;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-main);
            padding: 12px 16px;
            border-radius: var(--radius-md);
            margin-bottom: 4px;
            transition: all .2s;
        }
        .mobile-nav-link:hover {
            background: var(--bg-light);
        }
        .mobile-nav-link.active {
            color: var(--primary);
            background: rgba(27, 58, 92, .06);
            font-weight: 600;
        }
        .bottom-tab {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60px;
            background: rgba(255, 255, 255, .96);
            -webkit-backdrop-filter: blur(14px);
            backdrop-filter: blur(14px);
            border-top: 1px solid #e2e8f0;
            display: none;
            align-items: center;
            justify-content: space-around;
            padding-bottom: env(safe-area-inset-bottom);
            z-index: 70;
        }
        .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 3px;
            font-size: 11px;
            font-weight: 500;
            color: var(--text-sub);
            flex: 1;
            height: 100%;
            transition: color .2s;
        }
        .tab-item.active {
            color: var(--primary);
            font-weight: 600;
        }
        .tab-item-cta {
            flex: 0 0 auto;
            padding: 0 14px;
        }
        .tab-cta-btn {
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--accent);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            padding: 8px 18px;
            border-radius: 24px;
            box-shadow: 0 4px 14px rgba(232, 163, 60, .4);
            white-space: nowrap;
        }
        footer {
            background: #10263B;
        }
        @media (max-width: 1023px) {
            .desktop-nav {
                display: none;
            }
            .bottom-tab {
                display: flex;
            }
            body {
                padding-bottom: 60px;
            }
            .page-hero {
                padding: 110px 0 40px;
            }
        }
        @media (min-width: 1024px) {
            .mobile-menu-btn {
                display: none;
            }
        }
        @media (max-width: 767px) {
            .page-hero {
                padding: 100px 0 36px;
            }
            .article-title {
                font-size: 28px;
            }
            .article-pager {
                flex-direction: column;
                align-items: stretch;
            }
            .pager-btn,
            .back-btn {
                justify-content: center;
                text-align: center;
            }
            .related-section {
                padding: 52px 0;
            }
            .cta-section {
                padding: 44px 0;
            }
        }
        @media (max-width: 520px) {
            .breadcrumb .current {
                max-width: 220px;
            }
        }