/* roulang page: index */
:root {
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-light: #EFF6FF;
    --secondary: #0891B2;
    --accent: #F59E0B;
    --bg: #F8FAFC;
    --bg-alt: #F1F5F9;
    --text: #0F172A;
    --text-body: #334155;
    --text-muted: #64748B;
    --text-light: #94A3B8;
    --border: #E2E8F0;
    --border-light: #F1F5F9;
    --radius: 16px;
    --shadow-sm: 0 1px 2px rgba(15,23,42,0.04);
    --shadow-lg: 0 8px 30px rgba(15,23,42,0.08);
    --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text-body);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
  }
  .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
  @media (max-width: 640px) { .container { padding: 0 16px; } }
  a { color: inherit; text-decoration: none; transition: color 0.2s ease; }
  img { max-width: 100%; display: block; }
  button { font-family: inherit; cursor: pointer; }
  input, textarea { font-family: inherit; }

  .btn-primary {
    display: inline-flex; align-items: center; justify-content: center;
    height: 44px; padding: 0 24px; border-radius: 10px;
    background: var(--primary); color: #fff; font-weight: 600; font-size: 15px;
    transition: all 0.2s ease; border: none; line-height: 1.2;
    box-shadow: 0 2px 8px rgba(37,99,235,0.18);
  }
  .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 18px rgba(37,99,235,0.25); }
  .btn-primary:active { transform: translateY(0); }
  .btn-primary:focus-visible { outline: 3px solid rgba(37,99,235,0.25); outline-offset: 2px; }

  .btn-secondary {
    display: inline-flex; align-items: center; justify-content: center;
    height: 44px; padding: 0 24px; border-radius: 10px;
    background: #fff; color: var(--primary); font-weight: 600; font-size: 15px;
    border: 1px solid var(--primary); transition: all 0.2s ease;
  }
  .btn-secondary:hover { background: var(--primary-light); }
  .btn-secondary:active { background: #DBEAFE; }
  .btn-secondary:focus-visible { outline: 3px solid rgba(37,99,235,0.25); outline-offset: 2px; }

  .text-link {
    display: inline-flex; align-items: center; gap: 4px;
    color: var(--primary); font-weight: 600; font-size: 14px;
    transition: all 0.2s ease;
  }
  .text-link:hover { color: var(--primary-dark); }
  .text-link:hover .arrow { transform: translateX(4px); }
  .text-link .arrow { transition: transform 0.2s ease; }

  .badge {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 4px 12px; border-radius: 999px;
    background: var(--primary-light); color: var(--primary);
    font-size: 12px; font-weight: 600; letter-spacing: 0.02em;
  }
  .badge-accent {
    background: #FEF3C7; color: #B45309;
  }
  .badge-dark {
    background: #1E293B; color: #fff;
  }

  .nav-link {
    position: relative; font-size: 15px; font-weight: 500;
    color: var(--text-muted); padding: 8px 2px;
    transition: color 0.2s ease;
  }
  .nav-link:hover { color: var(--primary); }
  .nav-link.active { color: var(--primary); font-weight: 600; }
  .nav-link.active::after {
    content: ''; position: absolute; left: 0; right: 0; bottom: 0;
    height: 2px; border-radius: 999px; background: var(--primary);
  }

  .card-hover {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  .card-hover:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
  }

  .faq-item { transition: background 0.2s ease, border-color 0.2s ease; }
  .faq-item.open { background: var(--bg); border-left: 3px solid var(--primary); }
  .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
  .faq-item.open .faq-answer { max-height: 300px; }
  .faq-icon { transition: transform 0.3s ease; }
  .faq-item.open .faq-icon { transform: rotate(45deg); color: var(--primary); }

  .stat-number { font-variant-numeric: tabular-nums; }

  .hero-grid-bg {
    background-image:
      linear-gradient(rgba(37,99,235,0.03) 1px, transparent 1px),
      linear-gradient(90deg, rgba(37,99,235,0.03) 1px, transparent 1px);
    background-size: 32px 32px;
  }

  .section-padding { padding: 96px 0; }
  @media (max-width: 768px) { .section-padding { padding: 56px 0; } }

  .line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .line-clamp-1 {
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  #site-header.scrolled {
    box-shadow: 0 4px 20px rgba(15,23,42,0.06);
  }

  .btn-disabled {
    background: var(--border); color: var(--text-light);
    cursor: not-allowed; box-shadow: none;
  }
  .btn-disabled:hover { transform: none; background: var(--border); box-shadow: none; }

  .footer-link {
    color: var(--text-muted); font-size: 14px;
    transition: color 0.2s ease;
  }
  .footer-link:hover { color: var(--primary); }

  @media (max-width: 1024px) {
    .hero-title { font-size: 38px; }
  }
  @media (max-width: 640px) {
    .hero-title { font-size: 32px; }
  }

/* roulang page: category1 */
:root {
            --primary: #2563EB;
            --primary-hover: #1D4ED8;
            --primary-light: #EFF6FF;
            --primary-lighter: #DBEAFE;
            --accent: #0891B2;
            --warning: #F59E0B;
            --bg: #F8FAFC;
            --bg-alt: #F1F5F9;
            --card-bg: #FFFFFF;
            --title: #0F172A;
            --body: #334155;
            --muted: #64748B;
            --disabled: #94A3B8;
            --border: #E2E8F0;
            --border-light: #F1F5F9;
            --success: #16A34A;
            --error: #DC2626;
            --radius: 16px;
            --radius-lg: 20px;
            --radius-sm: 12px;
            --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
            --shadow-lg: 0 8px 30px rgba(15, 23, 42, 0.08);
            --container: 1200px;
            --header-h: 72px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background: var(--bg);
            color: var(--body);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s ease;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        input,
        textarea {
            font-family: inherit;
        }
        .header-wrap {
            position: sticky;
            top: 0;
            z-index: 50;
            background: #FFFFFF;
            border-bottom: 1px solid var(--border);
            height: var(--header-h);
            transition: box-shadow 0.3s ease;
        }
        .header-wrap.scrolled {
            box-shadow: 0 2px 12px rgba(15, 23, 42, 0.06);
        }
        .nav-link {
            font-size: 15px;
            color: var(--muted);
            font-weight: 500;
            position: relative;
            padding: 6px 2px;
            transition: color 0.2s 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: -6px;
            height: 2px;
            background: var(--primary);
            border-radius: 9999px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: var(--primary);
            color: #FFFFFF;
            font-size: 15px;
            font-weight: 600;
            height: 44px;
            padding: 0 24px;
            border-radius: 10px;
            border: none;
            transition: all 0.2s ease;
            box-shadow: var(--shadow-sm);
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-primary:focus-visible {
            outline: none;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: #FFFFFF;
            color: var(--primary);
            font-size: 15px;
            font-weight: 600;
            height: 44px;
            padding: 0 24px;
            border-radius: 10px;
            border: 1px solid var(--primary);
            transition: all 0.2s ease;
        }
        .btn-secondary:hover {
            background: var(--primary-light);
        }
        .btn-secondary:active {
            background: var(--primary-lighter);
        }
        .btn-warning {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: var(--warning);
            color: #FFFFFF;
            font-size: 15px;
            font-weight: 600;
            height: 44px;
            padding: 0 24px;
            border-radius: 10px;
            border: none;
            transition: all 0.2s ease;
        }
        .btn-warning:hover {
            filter: brightness(1.05);
            transform: translateY(-2px);
        }
        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .section-white {
            background: #FFFFFF;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-padding {
            padding: 96px 0;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 9999px;
            font-size: 12px;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary);
        }
        .badge-warning {
            background: #FEF3C7;
            color: #B45309;
        }
        .footer-link {
            color: var(--muted);
            font-size: 14px;
            transition: color 0.2s ease;
        }
        .footer-link:hover {
            color: var(--primary);
        }
        .divider {
            height: 1px;
            background: var(--border-light);
            border: none;
        }
        .mobile-menu {
            display: none;
            position: absolute;
            top: var(--header-h);
            left: 0;
            right: 0;
            background: #FFFFFF;
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-lg);
            padding: 16px 24px 24px;
        }
        .mobile-menu.open {
            display: block;
        }
        .mobile-menu a {
            display: block;
            padding: 12px 0;
            font-size: 16px;
            font-weight: 500;
            color: var(--body);
            border-bottom: 1px solid var(--border-light);
        }
        .mobile-menu a:last-child {
            border-bottom: none;
        }
        .mobile-menu a.active {
            color: var(--primary);
        }
        .countdown-box {
            background: var(--bg-alt);
            border-radius: 12px;
            padding: 6px 14px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .countdown-box .label {
            font-size: 12px;
            color: var(--muted);
        }
        .countdown-box .time {
            font-size: 16px;
            font-weight: 800;
            color: var(--title);
            font-variant-numeric: tabular-nums;
        }
        .live-dot {
            width: 8px;
            height: 8px;
            background: var(--success);
            border-radius: 9999px;
            animation: pulse 1.5s infinite;
        }
        @keyframes pulse {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.5;
                transform: scale(1.2);
            }
        }
        .feature-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px;
            transition: all 0.3s ease;
        }
        .feature-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
        }
        .feature-card .icon-wrap {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            background: var(--primary-light);
            color: var(--primary);
        }
        .timeline-item {
            position: relative;
            padding-left: 56px;
            padding-bottom: 36px;
        }
        .timeline-item::before {
            content: "";
            position: absolute;
            left: 22px;
            top: 40px;
            bottom: 0;
            width: 2px;
            background: var(--border-light);
        }
        .timeline-item:last-child::before {
            display: none;
        }
        .timeline-item .dot {
            position: absolute;
            left: 14px;
            top: 6px;
            width: 18px;
            height: 18px;
            border-radius: 9999px;
            background: var(--primary);
            border: 3px solid var(--primary-lighter);
        }
        .timeline-item .time {
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            background: var(--primary-light);
            padding: 2px 10px;
            border-radius: 9999px;
            display: inline-block;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-light);
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-question {
            padding: 20px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            font-size: 16px;
            color: var(--title);
            transition: color 0.2s ease;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question .icon {
            font-size: 18px;
            color: var(--muted);
            transition: transform 0.3s ease;
            flex-shrink: 0;
            margin-left: 12px;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            font-size: 14px;
            color: var(--muted);
            line-height: 1.7;
        }
        .faq-answer.open {
            max-height: 300px;
            padding-bottom: 20px;
        }
        .faq-item.active .faq-question {
            color: var(--primary);
        }
        .faq-item.active .icon {
            transform: rotate(45deg);
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding-bottom: 20px;
        }
        .content-list li {
            padding-left: 24px;
            position: relative;
            margin-bottom: 10px;
            color: var(--body);
            font-size: 15px;
        }
        .content-list li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 9px;
            width: 8px;
            height: 8px;
            background: var(--primary);
            border-radius: 9999px;
        }
        @media (max-width: 1024px) {
            .section-padding {
                padding: 64px 0;
            }
            .desktop-nav {
                display: none !important;
            }
            .mobile-menu-btn {
                display: flex !important;
            }
            .hero-countdown {
                display: none;
            }
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 56px 0;
            }
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .feature-card {
                padding: 24px;
            }
        }
        @media (min-width: 1025px) {
            .mobile-menu-btn {
                display: none !important;
            }
        }
        .hero-banner {
            background: linear-gradient(135deg, #F8FAFC 0%, #EFF6FF 100%);
            border-radius: 0 0 24px 24px;
        }
        .category-card {
            transition: all 0.3s ease;
        }
        .category-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .text-accent {
            color: var(--accent);
        }
        .bg-accent-light {
            background: #ECFEFF;
        }
        .ring-accent {
            border-color: var(--accent);
        }
        .pointer-events-none {
            pointer-events: none;
        }

/* roulang page: category2 */
:root {
            --primary: #2563EB;
            --primary-dark: #1D4ED8;
            --primary-light: #EFF6FF;
            --secondary: #0891B2;
            --accent: #F59E0B;
            --bg: #F8FAFC;
            --surface: #FFFFFF;
            --alt-bg: #F1F5F9;
            --text: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --text-disabled: #94A3B8;
            --border: #E2E8F0;
            --border-light: #F1F5F9;
            --success: #16A34A;
            --danger: #DC2626;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
            --shadow-lg: 0 8px 30px rgba(15, 23, 42, 0.08);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background: var(--bg);
            color: var(--text-body);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s ease;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* 导航 */
        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
            position: relative;
            padding: 6px 2px;
            transition: color 0.2s ease;
        }
        .nav-link:hover {
            color: var(--primary);
        }
        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            background: var(--primary);
            border-radius: 999px;
        }

        .mobile-nav-link {
            display: block;
            padding: 10px 0;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            border-bottom: 1px solid var(--border-light);
        }
        .mobile-nav-link:hover {
            color: var(--primary);
        }
        .mobile-nav-link.active {
            color: var(--primary);
            font-weight: 700;
        }

        /* 按钮 */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 24px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
            box-shadow: var(--shadow-sm);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-primary:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 24px;
            background: #fff;
            color: var(--primary);
            border: 1px solid var(--primary);
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s ease, transform 0.2s ease;
        }
        .btn-secondary:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }
        .btn-secondary:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
        }

        /* 徽章 */
        .badge-yellow {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            background: rgba(245, 158, 11, 0.12);
            color: #B45309;
            border-radius: 999px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.02em;
        }
        .badge-yellow::before {
            content: "";
            width: 6px;
            height: 6px;
            background: var(--accent);
            border-radius: 50%;
            display: inline-block;
        }

        /* 特征卡片 */
        .feature-card-h {
            display: flex;
            gap: 20px;
            padding: 28px;
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
        }
        .feature-card-h:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary);
        }
        .feature-icon {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: var(--radius-md);
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
        }

        /* 场景要点列表 */
        .point-list-item {
            display: flex;
            gap: 16px;
            padding: 18px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .point-dot {
            flex-shrink: 0;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--secondary);
            margin-top: 10px;
        }

        /* FAQ */
        .faq-wrap {
            background: var(--surface);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            overflow: hidden;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            transition: background 0.2s ease;
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-item.active {
            background: var(--bg);
            box-shadow: inset 3px 0 0 var(--primary);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 24px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            transition: color 0.2s ease;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-item.active .faq-question {
            color: var(--primary);
        }
        .faq-icon {
            font-size: 14px;
            color: var(--text-muted);
            transition: transform 0.25s ease, color 0.2s ease;
            flex-shrink: 0;
            margin-left: 16px;
        }
        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            padding: 0 24px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.75;
        }
        .faq-item.active .faq-answer {
            max-height: 240px;
            padding-bottom: 20px;
        }

        /* 页脚 */
        .footer-link {
            font-size: 14px;
            color: var(--text-muted);
            transition: color 0.2s ease, padding-left 0.2s ease;
        }
        .footer-link:hover {
            color: var(--primary);
            padding-left: 3px;
        }

        /* 响应式 */
        @media (max-width: 640px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .btn-primary,
            .btn-secondary {
                width: 100%;
            }
            .feature-card-h {
                padding: 20px;
                flex-direction: column;
                gap: 14px;
            }
            .feature-icon {
                width: 40px;
                height: 40px;
                font-size: 17px;
            }
        }

        @media (min-width: 641px) and (max-width: 1024px) {
            .btn-primary,
            .btn-secondary {
                padding: 0 18px;
            }
        }

/* roulang page: article */
:root {
        --primary: #2563EB;
        --primary-dark: #1D4ED8;
        --primary-light: #EFF6FF;
        --cyan: #0891B2;
        --yellow: #F59E0B;
        --bg: #F8FAFC;
        --bg-alt: #F1F5F9;
        --text: #0F172A;
        --text-body: #334155;
        --text-muted: #64748B;
        --border: #E2E8F0;
        --divider: #F1F5F9;
        --radius: 16px;
        --shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
        --shadow-lg: 0 8px 30px rgba(15, 23, 42, 0.08);
    }
    * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }
    body {
        font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
        background: var(--bg);
        color: var(--text-body);
        line-height: 1.75;
        -webkit-font-smoothing: antialiased;
    }
    body .container {
        width: 100%;
        max-width: 1200px;
        margin-left: auto;
        margin-right: auto;
        padding-left: 24px;
        padding-right: 24px;
    }
    @media (max-width: 640px) {
        body .container {
            padding-left: 16px;
            padding-right: 16px;
        }
    }
    img {
        max-width: 100%;
        height: auto;
    }
    a {
        color: inherit;
        text-decoration: none;
    }
    button {
        cursor: pointer;
        font-family: inherit;
    }
    .nav-link {
        position: relative;
        font-size: 15px;
        color: var(--text-body);
        font-weight: 500;
        transition: color 0.2s;
        padding: 8px 2px;
    }
    .nav-link:hover {
        color: var(--primary);
    }
    .nav-link.active {
        color: var(--primary);
        font-weight: 600;
    }
    .nav-link.active::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 20px;
        height: 2px;
        background: var(--primary);
        border-radius: 9999px;
    }
    .mobile-nav-link {
        display: block;
        padding: 12px 8px;
        font-size: 15px;
        font-weight: 500;
        color: var(--text-body);
        border-bottom: 1px solid var(--divider);
        transition: color 0.2s;
    }
    .mobile-nav-link:hover {
        color: var(--primary);
    }
    .btn-primary {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        height: 44px;
        padding: 0 24px;
        background: var(--primary);
        color: #fff;
        border-radius: 8px;
        font-size: 14px;
        font-weight: 600;
        line-height: 1.2;
        border: none;
        transition: all 0.2s;
        gap: 8px;
        white-space: nowrap;
    }
    .btn-primary:hover {
        background: var(--primary-dark);
        transform: translateY(-2px);
        box-shadow: 0 8px 24px rgba(37, 99, 235, 0.25);
    }
    .btn-primary:active {
        transform: translateY(0);
        background: #1e40af;
    }
    .btn-primary:focus-visible {
        outline: 3px solid rgba(37, 99, 235, 0.3);
        outline-offset: 2px;
    }
    .btn-secondary {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        height: 44px;
        padding: 0 24px;
        background: #fff;
        color: var(--primary);
        border: 1px solid var(--primary);
        border-radius: 8px;
        font-size: 14px;
        font-weight: 600;
        line-height: 1.2;
        transition: all 0.2s;
        gap: 8px;
        white-space: nowrap;
    }
    .btn-secondary:hover {
        background: var(--primary-light);
    }
    .btn-secondary:active {
        background: #DBEAFE;
    }
    .btn-secondary:focus-visible {
        outline: 3px solid rgba(37, 99, 235, 0.25);
        outline-offset: 2px;
    }
    .footer-link {
        font-size: 14px;
        color: var(--text-muted);
        transition: color 0.2s;
    }
    .footer-link:hover {
        color: var(--primary);
    }
    .badge {
        display: inline-flex;
        align-items: center;
        padding: 4px 12px;
        border-radius: 9999px;
        background: var(--primary-light);
        color: var(--primary);
        font-size: 12px;
        font-weight: 600;
    }
    .article-body {
        font-size: 16px;
        line-height: 1.8;
        color: var(--text-body);
    }
    .article-body p {
        margin-bottom: 24px;
    }
    .article-body p:last-child {
        margin-bottom: 0;
    }
    .article-body h1,
    .article-body h2 {
        font-size: 20px;
        font-weight: 700;
        color: var(--text);
        margin: 32px 0 16px;
        line-height: 1.4;
    }
    .article-body h3 {
        font-size: 18px;
        font-weight: 700;
        color: var(--primary);
        margin: 32px 0 16px;
        line-height: 1.4;
    }
    .article-body h4 {
        font-size: 16px;
        font-weight: 700;
        color: var(--text);
        margin: 24px 0 12px;
        line-height: 1.4;
    }
    .article-body blockquote {
        border-left: 4px solid var(--primary);
        background: #F8FAFC;
        padding: 16px 20px;
        border-radius: 0 8px 8px 0;
        margin: 24px 0;
        color: var(--text-muted);
    }
    .article-body img {
        border-radius: 12px;
        margin: 24px 0;
        max-width: 100%;
        height: auto;
    }
    .article-body code {
        background: #F1F5F9;
        border-radius: 6px;
        padding: 2px 6px;
        font-family: "SFMono-Regular", Consolas, monospace;
        font-size: 14px;
        color: var(--text);
    }
    .article-body pre {
        background: #F1F5F9;
        border-radius: 12px;
        padding: 16px;
        overflow-x: auto;
        margin: 24px 0;
        font-family: "SFMono-Regular", Consolas, monospace;
        font-size: 14px;
        line-height: 1.7;
        color: var(--text);
    }
    .article-body pre code {
        background: transparent;
        padding: 0;
    }
    .article-body ul,
    .article-body ol {
        margin: 0 0 24px;
        padding-left: 24px;
    }
    .article-body li {
        margin-bottom: 8px;
    }
    .faq-item {
        border-bottom: 1px solid var(--divider);
        border-left: 3px solid transparent;
        transition: background 0.2s, border-color 0.2s;
    }
    .faq-item:last-child {
        border-bottom: none;
    }
    .faq-item.open {
        background: #F8FAFC;
        border-left-color: var(--primary);
        border-radius: 0 8px 8px 0;
    }
    .faq-question {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 20px 0;
        font-size: 16px;
        font-weight: 600;
        color: var(--text);
        cursor: pointer;
        transition: color 0.2s;
        gap: 12px;
    }
    .faq-question:hover {
        color: var(--primary);
    }
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease, padding 0.3s ease;
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.7;
    }
    .faq-item.open .faq-answer {
        max-height: 300px;
        padding-bottom: 20px;
    }
    .faq-icon {
        transition: all 0.2s;
        width: 20px;
        height: 20px;
        border-radius: 50%;
        background: var(--bg-alt);
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        color: var(--text-muted);
    }
    .faq-item.open .faq-icon {
        transform: rotate(45deg);
        background: var(--primary);
        color: #fff;
    }
    .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;
    }