/* roulang page: index */
:root {
      --primary: #00FF88;
      --primary-hover: #00dd77;
      --secondary: #6C5CE7;
      --bg: #0B0E14;
      --surface: #141923;
      --surface-elevated: #1C2333;
      --text: #FFFFFF;
      --text-muted: #A0AEC0;
      --text-dim: #718096;
      --border: rgba(255, 255, 255, 0.08);
      --border-accent: rgba(0, 255, 136, 0.3);
      --radius: 8px;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --transition: all 0.25s ease;
      --glow: 0 0 20px rgba(0, 255, 136, 0.25);
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg);
      color: var(--text);
    }
    body {
      font-family: var(--font-stack);
      line-height: 1.6;
      background-color: var(--bg);
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    ul, ol {
      list-style: none;
    }
    button, input, select, textarea {
      font-family: inherit;
      font-size: inherit;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }
    .section-dark {
      background-color: var(--bg);
    }
    .section-surface {
      background-color: var(--surface);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-header.center {
      text-align: center;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      border-radius: 4px;
      font-size: 0.8125rem;
      font-weight: 600;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      background: rgba(0, 255, 136, 0.1);
      color: var(--primary);
      border: 1px solid var(--border-accent);
      margin-bottom: 14px;
    }
    .badge-dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background-color: var(--primary);
      box-shadow: 0 0 8px var(--primary);
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text);
      margin-bottom: 16px;
      letter-spacing: -0.02em;
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 24px;
      font-size: 0.9375rem;
      font-weight: 600;
      border-radius: var(--radius);
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      min-height: 46px;
      gap: 8px;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #05080c;
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: var(--glow);
      transform: translateY(-1px);
    }
    .btn-ghost {
      background: transparent;
      color: var(--text);
      border-color: rgba(255, 255, 255, 0.2);
    }
    .btn-ghost:hover {
      border-color: var(--primary);
      color: var(--primary);
      box-shadow: 0 0 15px rgba(0, 255, 136, 0.2);
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(11, 14, 20, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    .topbar {
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 0.75rem;
      color: var(--text-dim);
      padding: 6px 0;
    }
    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .topbar-meta {
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .topbar-status {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--primary);
    }
    .main-nav {
      padding: 14px 0;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.01em;
      color: var(--text);
    }
    .brand-symbol {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #05080c;
      font-weight: 900;
      font-size: 1rem;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-link {
      font-size: 0.875rem;
      color: var(--text-muted);
      font-weight: 500;
      position: relative;
      padding: 4px 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
    }
    .hero-dual-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-left h1 {
      font-size: 2.6rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.03em;
    }
    .hero-left h1 span {
      background: linear-gradient(90deg, #FFFFFF, var(--primary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.75;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 32px;
    }
    .hero-fast-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    .fast-entry-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 20px;
      transition: var(--transition);
      display: block;
    }
    .fast-entry-card:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
      box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4);
    }
    .entry-badge {
      font-size: 0.6875rem;
      color: var(--secondary);
      font-weight: 700;
      text-transform: uppercase;
      margin-bottom: 6px;
    }
    .entry-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 6px;
    }
    .entry-desc {
      font-size: 0.8125rem;
      color: var(--text-dim);
      line-height: 1.5;
    }
    .category-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .category-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
      overflow: hidden;
      transition: var(--transition);
    }
    .category-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 3px;
      height: 100%;
      background: var(--primary);
      opacity: 0;
      transition: var(--transition);
    }
    .category-card:hover {
      border-color: rgba(255, 255, 255, 0.16);
      transform: translateY(-4px);
    }
    .category-card:hover::before {
      opacity: 1;
    }
    .category-card h3 {
      font-size: 1.125rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text);
    }
    .category-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .category-card .card-metric {
      font-size: 0.75rem;
      color: var(--primary);
      font-family: monospace;
    }
    .curated-showcase {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }
    .curated-visual {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border);
      position: relative;
    }
    .curated-visual img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .curated-details h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text);
    }
    .curated-details p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.75;
      margin-bottom: 24px;
    }
    .curated-specs {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-bottom: 28px;
    }
    .spec-item {
      background: var(--surface-elevated);
      padding: 14px;
      border-radius: 6px;
      border: 1px solid var(--border);
    }
    .spec-num {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--primary);
      display: block;
      margin-bottom: 4px;
    }
    .spec-label {
      font-size: 0.8125rem;
      color: var(--text-dim);
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .news-card:hover {
      border-color: rgba(255, 255, 255, 0.18);
      transform: translateY(-4px);
    }
    .news-thumb {
      height: 180px;
      width: 100%;
      object-fit: cover;
      border-bottom: 1px solid var(--border);
    }
    .news-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 0.75rem;
      color: var(--text-dim);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 1.0625rem;
      font-weight: 700;
      margin-bottom: 12px;
      line-height: 1.4;
      color: var(--text);
    }
    .news-summary {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      flex-grow: 1;
    }
    .news-link {
      font-size: 0.8125rem;
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .rank-board {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 32px;
    }
    .rank-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .rank-table th {
      font-size: 0.8125rem;
      color: var(--text-dim);
      padding: 12px 16px;
      border-bottom: 1px solid var(--border);
      text-transform: uppercase;
    }
    .rank-table td {
      padding: 16px;
      border-bottom: 1px solid var(--border);
      font-size: 0.875rem;
      color: var(--text-muted);
    }
    .rank-table tr:hover td {
      background: rgba(255, 255, 255, 0.02);
      color: var(--text);
    }
    .rank-index {
      font-weight: 800;
      color: var(--primary);
    }
    .rank-status {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.75rem;
      color: var(--primary);
      padding: 2px 8px;
      border-radius: 4px;
      background: rgba(0, 255, 136, 0.08);
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .case-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 32px;
      transition: var(--transition);
    }
    .case-card:hover {
      border-color: var(--border-accent);
    }
    .case-meta {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 16px;
    }
    .case-tag {
      font-size: 0.75rem;
      color: var(--secondary);
      font-weight: 600;
    }
    .case-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 14px;
      color: var(--text);
    }
    .case-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .case-metrics-bar {
      display: flex;
      gap: 24px;
      border-top: 1px solid var(--border);
      padding-top: 16px;
    }
    .case-m-item span {
      display: block;
    }
    .case-m-val {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--primary);
    }
    .case-m-lbl {
      font-size: 0.75rem;
      color: var(--text-dim);
    }
    .partner-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 16px;
    }
    .partner-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 20px 14px;
      text-align: center;
      font-size: 0.875rem;
      color: var(--text-muted);
      font-weight: 500;
      transition: var(--transition);
    }
    .partner-card:hover {
      border-color: rgba(255, 255, 255, 0.2);
      color: var(--text);
    }
    .guarantee-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .guarantee-item {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
    }
    .guarantee-item h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 8px;
    }
    .guarantee-item p {
      font-size: 0.8125rem;
      color: var(--text-dim);
      line-height: 1.6;
    }
    .cta-box {
      background: linear-gradient(135deg, var(--surface-elevated), #0e141f);
      border: 1px solid var(--border-accent);
      border-radius: var(--radius);
      padding: 48px;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }
    .cta-info h3 {
      font-size: 1.875rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 14px;
      color: var(--text);
    }
    .cta-info p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .cta-form {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .cta-input, .cta-select {
      width: 100%;
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 6px;
      padding: 12px 16px;
      color: var(--text);
      outline: none;
      transition: var(--transition);
    }
    .cta-input:focus, .cta-select:focus {
      border-color: var(--primary);
    }
    .site-footer {
      background: #07090d;
      border-top: 1px solid var(--border);
      padding: 60px 0 30px;
      font-size: 0.875rem;
      color: var(--text-dim);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--text);
      margin-bottom: 12px;
    }
    .footer-brand-desc {
      font-size: 0.8125rem;
      line-height: 1.6;
      color: var(--text-dim);
      margin-bottom: 16px;
    }
    .footer-heading {
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--text);
      text-transform: uppercase;
      margin-bottom: 16px;
      letter-spacing: 0.05em;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid var(--border);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.75rem;
    }
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 20px 24px;
    }
    .faq-item summary {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item summary::after {
      content: '+';
      font-size: 1.25rem;
      color: var(--primary);
      transition: var(--transition);
    }
    .faq-item[open] summary::after {
      content: '−';
    }
    .faq-item p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-top: 14px;
      padding-top: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }
    .stats-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 28px 20px;
      text-align: center;
    }
    .stat-val {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
      font-family: monospace;
    }
    .stat-desc {
      font-size: 0.8125rem;
      color: var(--text-dim);
    }
    @media (max-width: 1024px) {
      .hero-dual-grid {
        grid-template-columns: 1fr;
      }
      .curated-showcase {
        grid-template-columns: 1fr;
      }
      .cta-box {
        grid-template-columns: 1fr;
      }
      .partner-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .category-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .guarantee-strip, .stats-strip {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .section-wrap {
        padding: 48px 0;
      }
      .hero-left h1 {
        font-size: 1.875rem;
      }
      .hero-fast-grid {
        grid-template-columns: 1fr;
      }
      .news-grid, .case-grid {
        grid-template-columns: 1fr;
      }
      .topbar {
        display: none;
      }
      .nav-links {
        display: none;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .guarantee-strip, .stats-strip {
        grid-template-columns: 1fr;
      }
      .partner-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .category-grid {
        grid-template-columns: 1fr;
      }
      .cta-box {
        padding: 24px;
      }
    }