/* roulang page: index */
:root {
    --bg-primary: #060A13;
    --bg-secondary: #0B1320;
    --bg-footer: #04070D;
    --color-primary: #38BDF8;
    --color-primary-dark: #0EA5E9;
    --color-accent: #22D3EE;
    --color-title: #F1F5F9;
    --color-body: #94A3B8;
    --color-muted: #64748B;
    --color-success: #34D399;
    --color-warning: #FBBF24;
    --border-glass: rgba(255,255,255,0.08);
    --bg-glass: rgba(255,255,255,0.04);
    --radius-card: 1rem;
    --radius-large: 1.5rem;
    --radius-btn: 9999px;
    --shadow-primary: 0 0 20px rgba(56,189,248,0.35);
    --shadow-card: 0 8px 30px rgba(14,165,233,0.12);
    --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  }

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

  html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
  }

  body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--color-body);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
  }

  a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
  }

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

  button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
  }

  input,
  textarea {
    font-family: inherit;
    outline: none;
  }

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

  @media (min-width: 768px) {
    .container {
      padding: 0 1.5rem;
    }
  }

  .section-padding {
    padding: 4rem 0;
  }

  @media (min-width: 768px) {
    .section-padding {
      padding: 6rem 0;
    }
  }

  .section-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-title);
    padding-left: 1rem;
    border-left: 4px solid var(--color-primary);
    margin-bottom: 2.5rem;
    letter-spacing: -0.02em;
  }

  @media (min-width: 768px) {
    .section-title {
      font-size: 1.875rem;
    }
  }

  .glass-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-card);
    transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
  }

  .glass-card:hover {
    border-color: rgba(56, 189, 248, 0.45);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
  }

  .content-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-card);
    padding: 1.5rem;
    transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
  }

  .content-card:hover {
    border-color: rgba(56, 189, 248, 0.5);
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #38BDF8, #22D3EE);
    color: #0B1220;
    font-weight: 700;
    font-size: 1rem;
    border-radius: var(--radius-btn);
    padding: 0.8rem 1.75rem;
    box-shadow: var(--shadow-primary);
    transition: all 0.3s ease;
    min-height: 48px;
    white-space: nowrap;
  }

  .btn-primary:hover {
    box-shadow: 0 0 30px rgba(56, 189, 248, 0.55);
    transform: translateY(-2px);
    filter: brightness(1.05);
  }

  .btn-primary:active {
    transform: scale(0.95);
  }

  .btn-primary:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.5), var(--shadow-primary);
  }

  .btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #fff;
    border-radius: var(--radius-btn);
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
    min-height: 48px;
    white-space: nowrap;
  }

  .btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(56, 189, 248, 0.4);
  }

  .btn-ghost:active {
    transform: scale(0.95);
  }

  .btn-ghost:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.5);
  }

  .btn-copy {
    display: inline-flex;
    align-items: center;
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.2);
    color: #38BDF8;
    padding: 0.375rem 0.875rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    transition: all 0.3s ease;
    min-height: 32px;
  }

  .btn-copy:hover {
    background: rgba(56, 189, 248, 0.2);
  }

  .btn-copy.copied {
    color: var(--color-success);
    border-color: rgba(52, 211, 153, 0.3);
    background: rgba(52, 211, 153, 0.1);
  }

  .nav-link {
    position: relative;
    color: #cbd5e1;
    font-size: 0.9375rem;
    font-weight: 500;
    padding: 0.5rem 0;
    transition: color 0.3s ease;
  }

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

  .nav-link.active {
    color: #fff;
  }

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

  .badge {
    display: inline-flex;
    align-items: center;
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.25rem 0.625rem;
    border-radius: 9999px;
    background: rgba(56, 189, 248, 0.1);
    color: #38BDF8;
    border: 1px solid rgba(56, 189, 248, 0.2);
    white-space: nowrap;
  }

  .ice-grid {
    background-image:
      linear-gradient(rgba(56, 189, 248, 0.05) 1px, transparent 1px),
      linear-gradient(90deg, rgba(56, 189, 248, 0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
  }

  .hero-bg {
    background: radial-gradient(ellipse at 30% 30%, #0F1B2E 0%, #060A13 70%);
  }

  .aurora {
    position: absolute;
    width: 480px;
    height: 480px;
    border-radius: 50%;
    background: rgba(34, 211, 238, 0.08);
    filter: blur(80px);
    pointer-events: none;
  }

  @media (max-width: 768px) {
    .aurora {
      width: 260px;
      height: 260px;
      opacity: 0.6;
    }
  }

  .float-slow {
    animation: floatSlow 6s ease-in-out infinite;
  }

  .float-slower {
    animation: floatSlow 8s ease-in-out infinite reverse;
  }

  @keyframes floatSlow {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-10px);
    }
  }

  details.faq-item {
    background: var(--bg-glass);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-card);
    transition: border-color 0.3s ease;
  }

  details.faq-item[open] {
    border-color: rgba(56, 189, 248, 0.4);
  }

  details.faq-item summary {
    padding: 1rem 1.5rem;
    font-weight: 600;
    color: #e2e8f0;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 48px;
    user-select: none;
  }

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

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

  details.faq-item .faq-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
    color: var(--color-primary);
  }

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

  details.faq-item .faq-answer {
    padding: 0 1.5rem 1.25rem;
    color: var(--color-body);
    line-height: 1.8;
  }

  details.faq-item:focus-within {
    outline: none;
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.25);
  }

  .text-link {
    color: var(--color-primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    transition: color 0.3s ease;
  }

  .text-link:hover {
    color: #7DD3FC;
  }

  .text-link .arrow {
    transition: transform 0.3s ease;
  }

  .text-link:hover .arrow {
    transform: translateX(4px);
  }

  .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;
  }

  @media (min-width: 1024px) {
    .nav-desktop {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      align-items: center;
      height: 100%;
    }
  }

  .mobile-menu-panel {
    background: rgba(6, 10, 19, 0.97);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .mobile-menu-panel a {
    min-height: 48px;
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    color: #cbd5e1;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }

  .mobile-menu-panel a:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.04);
  }

  .mobile-menu-panel a.active {
    color: var(--color-primary);
  }

  .metric-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.2;
    letter-spacing: -0.03em;
    font-variant-numeric: tabular-nums;
  }

  @media (min-width: 768px) {
    .metric-number {
      font-size: 3rem;
    }
  }

  .icon-circle {
    width: 3rem;
    height: 3rem;
    border-radius: 9999px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--color-primary);
    flex-shrink: 0;
  }

  .card-image-wrap {
    position: relative;
    border-radius: 0.75rem;
    overflow: hidden;
  }

  .card-image-wrap img {
    transition: transform 0.5s ease;
  }

  .content-card:hover .card-image-wrap img {
    transform: scale(1.04);
  }

  .gradient-text {
    background: linear-gradient(135deg, #38BDF8, #22D3EE);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .divider-light {
    height: 1px;
    background: linear-gradient(to right, transparent, rgba(255,255,255,0.1), transparent);
    border: none;
  }

  *:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.4);
    border-radius: 4px;
  }

  @media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      transition-duration: 0.01ms !important;
    }
  }

/* roulang page: article */
:root {
            --bg-primary: #060A13;
            --bg-secondary: #0B1320;
            --bg-footer: #04070D;
            --bg-glass: rgba(255, 255, 255, 0.04);
            --border-glass: rgba(255, 255, 255, 0.08);
            --accent: #38BDF8;
            --accent-dark: #0EA5E9;
            --accent-cyan: #22D3EE;
            --text-primary: #F1F5F9;
            --text-secondary: #94A3B8;
            --text-muted: #64748B;
            --success: #34D399;
            --warning: #FBBF24;
            --radius-card: 1rem;
            --radius-large: 1.5rem;
            --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.35);
            --shadow-card: 0 8px 30px rgba(14, 165, 233, 0.12);
            --transition: all 0.3s ease;
            --container-width: 80rem;
        }

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

        html {
            scroll-behavior: smooth;
        }

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

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

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

        a:hover {
            color: #7DD3FC;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
        }

        input {
            font-family: inherit;
        }

        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 1rem;
        }

        @media (min-width: 768px) {
            .container {
                padding: 0 1.5rem;
            }
        }

        .bg-night {
            background: var(--bg-primary);
        }

        /* ===== 导航 ===== */
        .nav-desktop {
            grid-template-columns: 1fr auto 1fr;
            height: 100%;
            align-items: center;
            padding: 0 1.5rem;
        }

        .nav-link {
            position: relative;
            font-size: 0.925rem;
            font-weight: 500;
            color: #cbd5e1;
            padding: 0.5rem 0.25rem;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: #ffffff;
        }

        .nav-link.active {
            color: #ffffff;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            border-radius: 2px;
            background: linear-gradient(to right, var(--accent), var(--accent-cyan));
        }

        .nav-cta {
            white-space: nowrap;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            font-size: 0.65rem;
            font-weight: 700;
            letter-spacing: 0.02em;
            padding: 0.15rem 0.5rem;
            border-radius: 999px;
            background: linear-gradient(to right, var(--accent), var(--accent-cyan));
            color: #0B1220;
            text-transform: uppercase;
        }

        /* ===== 按钮 ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: linear-gradient(to right, var(--accent), var(--accent-cyan));
            color: #0B1220;
            font-weight: 700;
            border-radius: 999px;
            padding: 0.75rem 1.5rem;
            font-size: 0.95rem;
            box-shadow: var(--shadow-glow);
            transition: var(--transition);
        }

        .btn-primary:hover {
            filter: brightness(1.1);
            transform: translateY(-1px);
            box-shadow: 0 0 24px rgba(56, 189, 248, 0.55);
            color: #0B1220;
        }

        .btn-primary:active {
            transform: scale(0.96);
        }

        .btn-primary:focus-visible,
        .btn-secondary:focus-visible,
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            border: 1px solid rgba(255, 255, 255, 0.15);
            background: rgba(255, 255, 255, 0.05);
            color: #ffffff;
            border-radius: 999px;
            padding: 0.75rem 1.5rem;
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(56, 189, 248, 0.4);
            color: #ffffff;
        }

        .btn-secondary:active {
            transform: scale(0.97);
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin: 1rem 0 0;
        }

        .breadcrumb a {
            color: var(--text-muted);
        }

        .breadcrumb a:hover {
            color: var(--accent);
        }

        .breadcrumb .sep {
            margin: 0 0.5rem;
            color: var(--text-muted);
            opacity: 0.5;
        }

        .breadcrumb .current {
            color: var(--text-secondary);
            font-weight: 500;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
            max-width: 320px;
            vertical-align: middle;
        }

        /* ===== 文章正文排版 ===== */
        .article-body {
            font-size: 1rem;
            line-height: 2;
            color: var(--text-secondary);
            word-wrap: break-word;
        }

        .article-body h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 2.5rem 0 1rem;
            padding-left: 1rem;
            border-left: 4px solid var(--accent);
            line-height: 1.4;
        }

        .article-body h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 1.8rem 0 0.8rem;
        }

        .article-body p {
            margin-bottom: 1.5rem;
        }

        .article-body a {
            color: var(--accent);
            border-bottom: 1px solid rgba(56, 189, 248, 0.4);
            padding-bottom: 1px;
        }

        .article-body a:hover {
            color: #7DD3FC;
            border-color: rgba(125, 211, 252, 0.6);
        }

        .article-body img {
            border-radius: 1.25rem;
            margin: 2rem auto;
        }

        .article-body ul,
        .article-body ol {
            margin: 0 0 1.5rem 0;
            padding-left: 1.5rem;
        }

        .article-body ul li {
            position: relative;
            padding: 0.25rem 0;
        }

        .article-body ul li::before {
            content: '';
            position: absolute;
            left: -1.1rem;
            top: 0.9rem;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--accent);
            opacity: 0.7;
        }

        .article-body ol li {
            padding: 0.25rem 0;
            list-style: decimal;
        }

        .article-body blockquote {
            border-left: 3px solid var(--accent);
            background: rgba(56, 189, 248, 0.06);
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 1rem 1rem 0;
            color: #cbd5e1;
            font-style: normal;
        }

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

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.925rem;
            border-radius: 0.85rem;
            overflow: hidden;
        }

        .article-body table th {
            background: rgba(56, 189, 248, 0.1);
            color: var(--text-primary);
            font-weight: 600;
            padding: 0.75rem 1rem;
            text-align: left;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .article-body table td {
            padding: 0.75rem 1rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            color: var(--text-secondary);
        }

        /* ===== 玻璃卡片 ===== */
        .glass-card {
            background: var(--bg-glass);
            border: 1px solid var(--border-glass);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-radius: var(--radius-card);
            transition: var(--transition);
        }

        .glass-card:hover {
            border-color: rgba(56, 189, 248, 0.5);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }

        /* ===== 文章元信息 ===== */
        .meta-badge {
            display: inline-flex;
            align-items: center;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.3rem 0.8rem;
            border-radius: 999px;
            background: linear-gradient(to right, rgba(56, 189, 248, 0.15), rgba(34, 211, 238, 0.15));
            color: var(--accent-cyan);
            border: 1px solid rgba(56, 189, 248, 0.2);
        }

        .meta-line {
            display: flex;
            flex-wrap: wrap;
            gap: 1.25rem;
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .meta-line span {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }

        /* ===== 相关推荐 ===== */
        .rel-card {
            background: var(--bg-glass);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }

        .rel-card:hover {
            border-color: rgba(56, 189, 248, 0.5);
            transform: translateY(-5px);
            box-shadow: var(--shadow-card);
        }

        .rel-card img {
            aspect-ratio: 16/10;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

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

        .rel-card-body {
            padding: 1.25rem;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .rel-card-body h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 0.5rem;
            line-height: 1.4;
        }

        .rel-card-body p {
            font-size: 0.875rem;
            color: var(--text-muted);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }

        .rel-card-body .rel-link {
            margin-top: 0.9rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--accent);
            display: inline-flex;
            align-items: center;
            gap: 0.25rem;
            transition: var(--transition);
        }

        .rel-card-body .rel-link:hover {
            color: #7DD3FC;
        }

        .rel-card-body .rel-link .arrow {
            transition: transform 0.3s ease;
        }

        .rel-card-body .rel-link:hover .arrow {
            transform: translateX(4px);
        }

        /* ===== 区块 ===== */
        .section-title {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            margin-bottom: 0.75rem;
        }

        .section-subtitle {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 1.5rem;
        }

        .section-title-wrap {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            margin-bottom: 1.75rem;
        }

        .section-title-wrap::before {
            content: '';
            width: 4px;
            height: 1.5rem;
            background: linear-gradient(to bottom, var(--accent), var(--accent-cyan));
            border-radius: 4px;
        }

        /* ===== CTA 区 ===== */
        .cta-card {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-radius: 2rem;
            padding: 3rem 2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-card::before {
            content: '';
            position: absolute;
            top: -80px;
            left: -60px;
            width: 240px;
            height: 240px;
            background: var(--accent-cyan);
            opacity: 0.08;
            border-radius: 50%;
            filter: blur(70px);
            pointer-events: none;
        }

        .cta-card::after {
            content: '';
            position: absolute;
            bottom: -60px;
            right: -40px;
            width: 200px;
            height: 200px;
            background: var(--accent);
            opacity: 0.07;
            border-radius: 50%;
            filter: blur(60px);
            pointer-events: none;
        }

        .copy-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: 999px;
            padding: 0.5rem 1rem;
            font-size: 0.85rem;
            color: var(--text-secondary);
            transition: var(--transition);
        }

        .copy-btn:hover {
            background: rgba(255, 255, 255, 0.14);
            color: #ffffff;
        }

        .copy-btn.copied {
            background: rgba(52, 211, 153, 0.15);
            border-color: rgba(52, 211, 153, 0.3);
            color: var(--success);
        }

        /* ===== 移动端菜单 ===== */
        .mobile-menu {
            position: fixed;
            inset: 0;
            z-index: 60;
            background: rgba(6, 10, 19, 0.98);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            display: flex;
            flex-direction: column;
            padding: 5rem 2rem 2rem;
            transition: opacity 0.3s ease, visibility 0.3s ease;
            opacity: 0;
            visibility: hidden;
        }

        .mobile-menu.open {
            opacity: 1;
            visibility: visible;
        }

        .mobile-menu a {
            font-size: 1.2rem;
            color: var(--text-primary);
            padding: 0.9rem 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            font-weight: 500;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .mobile-menu a:hover {
            color: var(--accent);
        }

        .mobile-menu a.btn-primary {
            color: #0B1220;
            border-bottom: none;
            justify-content: center;
            margin-top: 1.5rem;
            padding: 0.9rem 1.5rem;
        }

        .mobile-menu-close {
            position: absolute;
            top: 1.25rem;
            right: 1.25rem;
            color: var(--text-secondary);
        }

        .mobile-menu-close:hover {
            color: #ffffff;
        }

        /* ===== 空态 ===== */
        .empty-state {
            padding: 3rem 1rem;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 1rem;
            border: 1px dashed rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-large);
            background: rgba(255, 255, 255, 0.02);
        }

        .empty-state .empty-icon {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(56, 189, 248, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* ===== 页脚 ===== */
        .footer-link {
            color: var(--text-secondary);
            font-size: 0.875rem;
            transition: var(--transition);
        }

        .footer-link:hover {
            color: var(--accent);
        }

        .status-dot {
            width: 10px;
            height: 10px;
            background: var(--success);
            border-radius: 50%;
            display: inline-block;
            box-shadow: 0 0 8px rgba(52, 211, 153, 0.6);
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.5;
            }
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1023px) {
            .breadcrumb .current {
                max-width: 240px;
            }
        }

        @media (max-width: 767px) {
            .section-title {
                font-size: 1.4rem;
            }
            .article-body h2 {
                font-size: 1.25rem;
            }
            .article-body {
                font-size: 0.95rem;
                line-height: 1.9;
            }
            .cta-card {
                padding: 2rem 1.25rem;
                border-radius: 1.5rem;
            }
            .meta-line {
                gap: 0.8rem;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 0.85rem;
            }
            .breadcrumb .current {
                max-width: 160px;
            }
        }

/* roulang page: category1 */
:root {
    --night: #060A13;
    --night-secondary: #0B1320;
    --night-deep: #04070D;
    --accent: #38BDF8;
    --accent-deep: #0EA5E9;
    --accent-cyan: #22D3EE;
    --text-primary: #F1F5F9;
    --text-body: #94A3B8;
    --text-muted: #64748B;
    --border-subtle: rgba(255, 255, 255, 0.08);
    --card-bg: rgba(255, 255, 255, 0.04);
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.35);
    --shadow-card: 0 8px 30px rgba(14, 165, 233, 0.12);
    --transition: 0.3s ease;
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
    background-color: var(--night);
    color: var(--text-body);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }

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

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

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

  a:focus-visible,
  button:focus-visible,
  [tabindex]:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
  }

  section[id] {
    scroll-margin-top: 4.5rem;
  }

  .container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
  }

  @media (min-width: 768px) {
    .container {
      padding: 0 1.5rem;
    }
  }

  /* ===== 导航 ===== */
  .nav-desktop {
    grid-template-columns: 1fr auto 1fr;
    height: 100%;
    align-items: center;
    gap: 1rem;
  }

  .nav-link {
    position: relative;
    color: #94A3B8;
    font-size: 0.925rem;
    font-weight: 500;
    padding: 0.5rem 0.2rem;
    transition: color var(--transition);
    white-space: nowrap;
  }

  .nav-link:hover {
    color: #ffffff;
  }

  .nav-link.active {
    color: #ffffff;
  }

  .nav-link.active::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    background: linear-gradient(90deg, #38BDF8, #22D3EE);
    border-radius: 2px;
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.6);
  }

  .badge {
    display: inline-flex;
    align-items: center;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: #0B1220;
    background: linear-gradient(135deg, #38BDF8, #22D3EE);
    border-radius: 999px;
    padding: 0.15rem 0.5rem;
    line-height: 1.3;
    white-space: nowrap;
  }

  .mobile-nav-link {
    display: block;
    padding: 0.9rem 0.5rem;
    color: #94A3B8;
    font-size: 1rem;
    font-weight: 500;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: all var(--transition);
    border-radius: 8px;
  }

  .mobile-nav-link:hover,
  .mobile-nav-link.active {
    color: #ffffff;
    padding-left: 0.75rem;
    background: rgba(255, 255, 255, 0.03);
  }

  /* ===== 按钮 ===== */
  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #38BDF8, #22D3EE);
    color: #0B1220;
    font-weight: 700;
    border-radius: 999px;
    padding: 0.85rem 1.75rem;
    font-size: 0.95rem;
    line-height: 1.4;
    border: none;
    box-shadow: 0 0 20px rgba(56, 189, 248, 0.35);
    transition: all var(--transition);
    white-space: nowrap;
  }

  .btn-primary:hover {
    background: linear-gradient(135deg, #5AC8FA, #3EDEB5);
    box-shadow: 0 0 28px rgba(56, 189, 248, 0.55);
    transform: translateY(-1px);
  }

  .btn-primary:active {
    transform: scale(0.96);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.3);
  }

  .btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    font-weight: 600;
    border-radius: 999px;
    padding: 0.85rem 1.75rem;
    font-size: 0.95rem;
    line-height: 1.4;
    transition: all var(--transition);
    white-space: nowrap;
  }

  .btn-ghost:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(56, 189, 248, 0.4);
    color: #ffffff;
  }

  .btn-ghost:active {
    transform: scale(0.97);
  }

  .copy-domain-btn.copied {
    color: #34D399 !important;
    border-color: rgba(52, 211, 153, 0.5) !important;
    background-color: rgba(52, 211, 153, 0.08) !important;
  }

  /* ===== 板块 ===== */
  .section {
    padding: 4rem 0;
  }

  @media (min-width: 768px) {
    .section {
      padding: 6rem 0;
    }
  }

  .section-head {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    letter-spacing: -0.01em;
    position: relative;
    padding-left: 1rem;
  }

  .section-head::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.2em;
    bottom: 0.2em;
    width: 4px;
    border-radius: 4px;
    background: linear-gradient(180deg, #38BDF8, #22D3EE);
  }

  @media (min-width: 768px) {
    .section-head {
      font-size: 1.875rem;
    }
  }

  .section-sub {
    color: var(--text-body);
    font-size: 1rem;
    line-height: 1.8;
  }

  /* ===== 卡片 ===== */
  .glass-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 1rem;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1.5rem;
    transition: all var(--transition);
  }

  .glass-card:hover {
    border-color: rgba(56, 189, 248, 0.5);
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(14, 165, 233, 0.12);
  }

  .feature-tag {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(34, 211, 238, 0.08));
    border: 1px solid rgba(56, 189, 248, 0.3);
    color: #22D3EE;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 999px;
    padding: 0.25rem 0.75rem;
    line-height: 1.4;
  }

  .cover-img {
    border-radius: 0.75rem;
    object-fit: cover;
  }

  /* ===== Banner ===== */
  .page-banner {
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    background: linear-gradient(180deg, #0F1B2E, #060A13);
  }

  .page-banner::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(rgba(56, 189, 248, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(56, 189, 248, 0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: 2;
    pointer-events: none;
  }

  .stat-item {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 1rem;
    padding: 1rem 0.75rem;
    text-align: center;
    backdrop-filter: blur(12px);
    transition: border-color var(--transition);
  }

  .stat-item:hover {
    border-color: rgba(56, 189, 248, 0.35);
  }

  .stat-num {
    display: block;
    color: #38BDF8;
    font-size: 1.5rem;
    font-weight: 800;
    line-height: 1.2;
    font-variant-numeric: tabular-nums;
  }

  .stat-label {
    display: block;
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 0.25rem;
  }

  /* ===== 图文区块 ===== */
  .check-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(52, 211, 153, 0.15);
    color: #34D399;
    font-size: 0.75rem;
    font-weight: 800;
    flex-shrink: 0;
    margin-top: 0.15rem;
  }

  .flow-steps {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem 0.75rem;
    margin-top: 1.25rem;
  }

  .flow-step {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 0.5rem 0.9rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: border-color var(--transition);
  }

  .flow-step:hover {
    border-color: rgba(56, 189, 248, 0.4);
  }

  .flow-step span {
    color: var(--accent);
    margin-right: 0.35rem;
    font-size: 0.8rem;
    font-weight: 700;
  }

  .flow-arrow {
    color: var(--accent);
    font-size: 1rem;
    font-weight: 700;
  }

  /* ===== 词条列表 ===== */
  .guide-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    padding: 1.4rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transition: padding-left var(--transition);
  }

  .guide-item:hover {
    padding-left: 0.4rem;
  }

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

  .guide-item-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.15), rgba(34, 211, 238, 0.1));
    border: 1px solid rgba(56, 189, 248, 0.3);
    font-weight: 800;
    font-size: 0.9rem;
    color: #38BDF8;
    flex-shrink: 0;
  }

  /* ===== FAQ ===== */
  .faq-item {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 1rem;
    backdrop-filter: blur(20px);
    overflow: hidden;
    transition: border-color var(--transition);
  }

  .faq-item:hover {
    border-color: rgba(56, 189, 248, 0.3);
  }

  .faq-item summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    min-height: 44px;
    list-style: none;
    transition: color var(--transition);
  }

  .faq-item summary:hover {
    color: #ffffff;
  }

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

  .faq-item summary::after {
    content: '+';
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 1.25rem;
    line-height: 1;
    color: #38BDF8;
    transition: transform var(--transition);
    flex-shrink: 0;
  }

  .faq-item[open] summary::after {
    transform: rotate(45deg);
  }

  .faq-item .faq-answer {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-body);
    font-size: 0.95rem;
    line-height: 1.8;
  }

  /* ===== CTA ===== */
  .cta-glow-1,
  .cta-glow-2 {
    position: absolute;
    width: 340px;
    height: 340px;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.1;
    pointer-events: none;
  }

  .cta-glow-1 {
    background: #0EA5E9;
    top: -120px;
    left: 8%;
  }

  .cta-glow-2 {
    background: #22D3EE;
    bottom: -120px;
    right: 8%;
  }

  /* ===== 链接 ===== */
  .text-link {
    color: #38BDF8;
    transition: color var(--transition);
  }

  .text-link:hover {
    color: #7DD3FC;
  }