/* roulang page: index */
:root {
      --primary-deep: #0B1A3A;
      --accent-gold: #F0A500;
      --bg-dark: #0D1117;
      --card-bg: rgba(22, 27, 34, 0.7);
      --card-border: rgba(240, 165, 0, 0.15);
      --text-light: #E0E4E9;
      --text-muted: #B0B8C1;
      --radius-card: 16px;
      --radius-btn: 30px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --transition-fast: 0.3s ease;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --glass-blur: blur(12px);
    }

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

    body {
      background-color: var(--bg-dark);
      color: var(--text-light);
      font-family: var(--font-sans);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

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

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }

    /* 发光按钮 */
    .btn-glow {
      background: var(--accent-gold);
      color: var(--primary-deep);
      font-weight: 700;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
      transition: all var(--transition-fast);
      box-shadow: 0 0 12px rgba(240, 165, 0, 0.4);
      letter-spacing: 0.5px;
    }

    .btn-glow:hover {
      box-shadow: 0 0 18px #F0A500, 0 0 36px rgba(240, 165, 0, 0.55);
      transform: translateY(-1px);
      color: var(--primary-deep);
    }

    .btn-outline-gold {
      background: transparent;
      border: 1px solid var(--accent-gold);
      color: var(--accent-gold);
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      display: inline-block;
      text-align: center;
      transition: all var(--transition-fast);
      background: rgba(240, 165, 0, 0.05);
    }

    .btn-outline-gold:hover {
      background: rgba(240, 165, 0, 0.2);
      color: #FFF;
      border-color: #FFB81C;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 70px;
      background: rgba(13, 17, 23, 0.8);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      z-index: 100;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(240, 165, 0, 0.15);
      transition: background var(--transition-fast);
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent-gold);
      letter-spacing: 1px;
      white-space: nowrap;
    }

    .nav-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      align-items: center;
    }

    .nav-chip {
      background: rgba(255, 255, 255, 0.08);
      color: var(--text-muted);
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 15px;
      font-weight: 500;
      transition: all 0.25s;
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .nav-chip:hover,
    .nav-chip.active {
      background: var(--accent-gold);
      color: var(--primary-deep);
      border-color: var(--accent-gold);
      font-weight: 600;
    }

    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--accent-gold);
      font-size: 28px;
      cursor: pointer;
    }

    /* Hero */
    .hero-section {
      padding: 140px 0 80px;
      background: linear-gradient(135deg, #0B1A3A 0%, #0D1117 70%);
      position: relative;
      overflow: hidden;
    }

    .hero-section::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.25;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .hero-title {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 20px;
      font-weight: 400;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 550px;
    }

    .metric-board {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .metric-item {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 20px 24px;
      text-align: center;
      flex: 1;
      min-width: 140px;
    }

    .metric-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.2;
    }

    .metric-label {
      color: var(--text-muted);
      font-size: 15px;
      margin-top: 8px;
    }

    /* 板块标题 */
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
    }

    .section-spacing {
      padding: 90px 0;
    }

    /* 交错图文 */
    .advantage-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
      flex-wrap: wrap;
    }

    .advantage-img {
      flex: 1 1 300px;
      border-radius: 24px;
      overflow: hidden;
    }

    .advantage-text {
      flex: 1 1 300px;
    }

    .advantage-text h3 {
      font-size: 24px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }

    /* 服务矩阵标签 */
    .service-tabs {
      display: flex;
      gap: 12px;
      margin-bottom: 32px;
      flex-wrap: wrap;
    }

    .tab-chip {
      background: rgba(255,255,255,0.06);
      color: var(--text-muted);
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 600;
      cursor: pointer;
      transition: 0.2s;
      border: 1px solid transparent;
    }

    .tab-chip.active {
      background: var(--accent-gold);
      color: #0B1A3A;
      border-color: var(--accent-gold);
    }

    .service-panel {
      display: none;
      animation: fadeIn 0.3s;
    }

    .service-panel.active {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      align-items: center;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* 对比卡片 */
    .compare-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border-radius: var(--radius-card);
      padding: 28px;
      border: 1px solid var(--card-border);
    }

    .vs-divider {
      font-size: 28px;
      font-weight: 800;
      color: var(--accent-gold);
      margin: 0 12px;
      align-self: center;
    }

    /* FAQ */
    .accordion-title {
      font-size: 18px;
      font-weight: 600;
      background: transparent;
      border: none;
      color: white;
      padding: 16px 0;
      text-align: left;
      width: 100%;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      cursor: pointer;
    }

    .accordion-content {
      padding: 12px 0 20px;
      color: var(--text-muted);
    }

    /* 表单 */
    .input-glow {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(240,165,0,0.3);
      border-radius: 8px;
      color: white;
      padding: 14px;
      width: 100%;
      transition: 0.2s;
    }

    .input-glow:focus {
      border-color: var(--accent-gold);
      box-shadow: 0 0 10px rgba(240,165,0,0.5);
      outline: none;
    }

    footer {
      background: #0A0F18;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(240,165,0,0.2);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 32px;
      }
      .nav-tags {
        display: none;
        flex-direction: column;
        background: #0D1117;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        padding: 20px;
      }
      .nav-tags.open {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .metric-board {
        flex-direction: column;
      }
      .compare-row {
        flex-direction: column;
      }
      .vs-divider {
        margin: 16px 0;
      }
    }