/* roulang page: index */
:root {
      --deep-blue: #0A1128;
      --card-bg: #141F3D;
      --cyan: #00F0FF;
      --purple: #B829F0;
      --green: #00E676;
      --white: #FFFFFF;
      --text-light: #B0C4DE;
      --text-muted: #6A7B9B;
      --glass-bg: rgba(20, 31, 61, 0.6);
      --glass-border: rgba(0, 240, 255, 0.15);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-pill: 50px;
      --radius-sm: 12px;
      --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.4);
      --shadow-purple: 0 0 20px rgba(184, 41, 240, 0.5);
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--deep-blue);
      color: var(--text-light);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 17, 40, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.12);
      padding: 16px 0;
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo {
      font-size: 28px;
      font-weight: 700;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, var(--cyan) 0%, #8fd9ff 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-decoration: none;
    }
    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text-light);
      text-decoration: none;
      font-weight: 500;
      font-size: 16px;
      transition: var(--transition);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.3s ease;
    }
    .nav-links a:hover {
      color: var(--white);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 28px;
      cursor: pointer;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-repeat: no-repeat;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.18) 0%, transparent 50%);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 60px;
      align-items: center;
      width: 100%;
    }
    .dashboard-panel {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .metric-card {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      display: flex;
      align-items: center;
      gap: 16px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    }
    .metric-icon {
      font-size: 32px;
      color: var(--cyan);
    }
    .metric-value {
      font-size: 36px;
      font-weight: 700;
      color: var(--cyan);
      letter-spacing: -0.5px;
      font-feature-settings: "tnum";
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      text-transform: uppercase;
      letter-spacing: 0.8px;
    }
    .hero-content h1 {
      font-size: clamp(40px, 5vw, 64px);
      font-weight: 700;
      color: var(--white);
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-content h1 span {
      background: linear-gradient(to right, var(--cyan), #b7f0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-light);
      margin-bottom: 40px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cyan);
      border: none;
      color: #0A1128;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: 0 6px 18px rgba(0,240,255,0.35);
      text-decoration: none;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #3df7ff;
      box-shadow: 0 10px 28px rgba(0,240,255,0.6);
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
    }
    .btn-ghost:hover {
      background: rgba(0,240,255,0.08);
      box-shadow: 0 0 18px rgba(0,240,255,0.3);
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 42px;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 18px;
      margin-bottom: 56px;
    }
    /* 指标看板区 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }
    .stat-card {
      background: rgba(20,31,61,0.7);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      text-align: center;
      transition: var(--transition);
    }
    .stat-card:hover {
      border-color: var(--cyan);
      box-shadow: 0 8px 30px rgba(0,240,255,0.15);
    }
    .stat-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--cyan);
    }
    /* 服务矩阵 1+N */
    .service-matrix {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr;
      gap: 32px;
      align-items: start;
    }
    .featured-card {
      background: var(--glass-bg);
      backdrop-filter: blur(14px);
      border: 1px solid transparent;
      border-image: linear-gradient(135deg, var(--purple), var(--cyan)) 1;
      border-radius: var(--radius-lg);
      padding: 40px;
    }
    .mini-chart {
      height: 80px;
      background: linear-gradient(90deg, var(--cyan), var(--purple));
      border-radius: 40px;
      opacity: 0.7;
      margin: 24px 0;
    }
    .service-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .service-item {
      background: rgba(20,31,61,0.5);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: var(--radius-md);
      padding: 20px;
      display: flex;
      gap: 16px;
      transition: var(--transition);
    }
    .service-item:hover {
      background: rgba(20,31,61,0.8);
      transform: translateX(-6px);
      border-color: var(--cyan);
    }
    /* 对比区 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2px;
      background: rgba(0,240,255,0.2);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .compare-before, .compare-after {
      padding: 48px 32px;
      background: #0A1128;
    }
    .compare-after {
      background: #0F1A33;
      border-left: 2px solid var(--cyan);
    }
    .bar-chart {
      display: flex;
      align-items: flex-end;
      gap: 12px;
      height: 120px;
    }
    .bar {
      width: 24px;
      background: var(--cyan);
      border-radius: 6px 6px 0 0;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: rgba(20,31,61,0.5);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-md);
      padding: 24px;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      color: var(--white);
      display: flex;
      justify-content: space-between;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(180deg, #0A1128 0%, #0D1635 100%);
      text-align: center;
    }
    .footer {
      background: #050A18;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(0,240,255,0.3);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .hero .container {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .service-matrix {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10,17,40,0.9);
        backdrop-filter: blur(20px);
        justify-content: space-around;
        padding: 12px 0;
        z-index: 60;
        border-top: 1px solid rgba(0,240,255,0.2);
      }
      .mobile-bottom-nav a {
        color: var(--text-light);
        font-size: 20px;
      }
      .faq-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }