/* roulang page: index */
:root {
      --bg-primary: #0A0E17;
      --bg-card: rgba(26, 31, 46, 0.7);
      --bg-card-solid: #1A1F2E;
      --accent: #FF6B2C;
      --accent-hover: #FF8A55;
      --text-primary: #FFFFFF;
      --text-secondary: #8A94A6;
      --text-muted: #6B7280;
      --border: #2A3040;
      --border-light: rgba(255, 107, 44, 0.2);
      --positive: #00E5A0;
      --negative: #FF3B5C;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-glow: 0 0 24px rgba(255, 107, 44, 0.5);
      --shadow-card: 0 8px 32px rgba(255, 107, 44, 0.15);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
      --max-width: 1200px;
      --section-gap: 100px;
      --card-padding: 28px;
      --transition-fast: 0.2s ease;
      --transition-smooth: 0.3s ease;
    }

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

    body {
      background-color: var(--bg-primary);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航系统 */
    .nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 56px;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--text-primary);
      text-decoration: none;
      letter-spacing: -0.3px;
    }
    .logo-dot {
      width: 10px;
      height: 10px;
      background: var(--accent);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 10px var(--accent);
    }
    .channel-row {
      display: flex;
      justify-content: center;
      gap: 28px;
      padding: 8px 0;
      border-top: 1px solid rgba(255,255,255,0.04);
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: none;
      -ms-overflow-style: none;
    }
    .channel-row::-webkit-scrollbar {
      display: none;
    }
    .channel-link {
      color: var(--text-secondary);
      font-size: 13px;
      font-weight: 500;
      text-decoration: none;
      padding-bottom: 6px;
      border-bottom: 2px solid transparent;
      transition: color var(--transition-fast), border-color var(--transition-fast);
      position: relative;
    }
    .channel-link:hover,
    .channel-link.active {
      color: #fff;
      border-bottom-color: var(--accent);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 10px;
      flex-direction: column;
      gap: 5px;
      z-index: 110;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      transition: var(--transition-smooth);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(10, 14, 23, 0.98);
      backdrop-filter: blur(30px);
      z-index: 105;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
    }
    .mobile-menu a {
      color: #fff;
      font-size: 20px;
      text-decoration: none;
      font-weight: 500;
    }
    .mobile-menu.active {
      display: flex;
    }

    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      font-size: 24px;
      font-weight: 600;
      letter-spacing: -0.3px;
      margin-bottom: 40px;
      text-align: center;
      color: var(--text-primary);
    }
    .bg-grid {
      background-image: linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }

    /* Hero */
    #hero {
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 80% 20%, rgba(255,107,44,0.12) 0%, transparent 50%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-content {
      flex: 6;
    }
    .hero-visual {
      flex: 4;
      display: flex;
      justify-content: center;
    }
    .hero h1 {
      font-size: 32px;
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      margin-bottom: 16px;
    }
    .hero .subtitle {
      font-size: 16px;
      color: var(--text-secondary);
      max-width: 450px;
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn {
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
      transition: all var(--transition-smooth);
      border: 1.5px solid transparent;
    }
    .btn-primary {
      background: var(--accent);
      color: #fff;
      border-color: var(--accent);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: var(--shadow-glow);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border-color: var(--accent);
      color: var(--accent);
    }
    .btn-outline:hover {
      background: rgba(255,107,44,0.1);
    }
    .live-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px;
      text-align: center;
      box-shadow: 0 8px 20px rgba(0,0,0,0.4);
      width: 100%;
    }
    .score {
      font-family: var(--font-mono);
      font-size: 42px;
      font-weight: 700;
      color: var(--accent);
      text-shadow: 0 0 12px rgba(255,107,44,0.7);
    }
    .team {
      font-size: 14px;
      color: var(--text-secondary);
      margin: 8px 0;
    }
    .scroll-hint {
      text-align: center;
      margin-top: 50px;
      animation: bounce 2s infinite;
      color: var(--text-secondary);
    }
    @keyframes bounce {
      0%,100%{transform:translateY(0);}
      50%{transform:translateY(6px);}
    }

    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: var(--card-padding);
      transition: all var(--transition-smooth);
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      text-align: left;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card);
      border-color: var(--accent);
    }
    .card-icon {
      margin-bottom: 20px;
      color: var(--accent);
    }
    .service-card h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .service-card p {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 16px;
    }
    .text-link {
      color: var(--accent);
      font-size: 14px;
      text-decoration: none;
    }

    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .metric-item {
      background: rgba(26,31,46,0.6);
      backdrop-filter: blur(8px);
      border: 1px solid #2A3040;
      border-radius: var(--radius-card);
      padding: 24px;
      text-align: center;
    }
    .metric-value {
      font-family: var(--font-mono);
      font-size: 40px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .trend-up { color: var(--positive); }
    .trend-down { color: var(--negative); }
    .metric-label {
      font-size: 12px;
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 对比 */
    .compare-wrapper {
      display: flex;
      align-items: center;
      gap: 32px;
      justify-content: center;
    }
    .vs-badge {
      background: var(--accent);
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #000;
      flex-shrink: 0;
    }
    .compare-col {
      flex: 1;
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border);
      border-radius: var(--radius-card);
      padding: 24px;
    }
    .progress-item {
      margin: 18px 0;
    }
    .progress-label {
      display: flex;
      justify-content: space-between;
      font-size: 14px;
      margin-bottom: 6px;
    }
    .progress-bar {
      height: 8px;
      background: #2A3040;
      border-radius: 4px;
      overflow: hidden;
    }
    .progress-fill {
      height: 100%;
      background: var(--accent);
      border-radius: 4px;
      box-shadow: 0 0 8px var(--accent);
    }

    /* FAQ */
    .faq-list {
      max-width: 720px;
      margin: 0 auto;
    }
    .faq-item {
      background: #1A1F2E;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 16px 20px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 500;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #141820;
      padding: 0 20px;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      padding: 16px 20px;
      max-height: 200px;
    }

    /* 表单 */
    .contact-form {
      max-width: 520px;
      margin: 0 auto;
    }
    .form-group {
      margin-bottom: 20px;
    }
    input, select, textarea {
      width: 100%;
      background: #1A1F2E;
      border: 1px solid #2A3040;
      border-radius: var(--radius-input);
      padding: 12px 16px;
      color: #fff;
      font-size: 15px;
      outline: none;
      transition: var(--transition-fast);
    }
    input:focus, select:focus, textarea:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(255,107,44,0.2);
    }
    .btn-glow {
      background: var(--accent);
      color: #fff;
      width: 100%;
      padding: 16px;
      font-weight: 700;
      border: none;
      animation: breathing 2s infinite;
    }
    @keyframes breathing {
      0%{box-shadow: 0 0 12px var(--accent);}
      50%{box-shadow: 0 0 28px var(--accent);}
      100%{box-shadow: 0 0 12px var(--accent);}
    }

    footer {
      background: #0A0E17;
      border-top: 1px solid #2A3040;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    .copyright {
      margin-top: 40px;
      color: #6B7280;
      font-size: 12px;
      text-align: center;
    }

    @media (max-width: 992px) {
      .hero-grid { flex-direction: column; }
      .cards-grid { grid-template-columns: repeat(2,1fr); }
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .channel-row { display: none; }
      .hamburger { display: flex; }
      .cards-grid, .metrics-grid { grid-template-columns: 1fr; }
      .compare-wrapper { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
      h1 { font-size: 28px; }
    }