/* roulang page: index */
/* ----- 设计变量 :root ----- */
    :root {
      --deep-bg: #0A0E1A;
      --dark-surface: #0F1629;
      --electric-blue: #00C2FF;
      --neon-purple: #A855F7;
      --cyan-accent: #00F0B5;
      --amber-warning: #F59E0B;
      --white: #FFFFFF;
      --body-text: #B0C4DE;
      --muted-text: #7B8CA8;
      --glass-bg: rgba(15, 25, 50, 0.65);
      --glass-border: rgba(0, 194, 255, 0.25);
      --glass-highlight: rgba(0, 194, 255, 0.18);
      --card-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
      --glow-blue: 0 0 20px rgba(0, 194, 255, 0.55);
      --glow-purple: 0 0 22px rgba(168, 85, 247, 0.45);
      --radius-card: 22px;
      --radius-btn: 14px;
      --radius-input: 10px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, -apple-system, sans-serif;
      --font-mono: 'DIN Alternate', 'Roboto Mono', 'Courier New', monospace;
      --transition-smooth: all 0.28s cubic-bezier(0.2, 0.9, 0.4, 1);
    }

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

    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 20% 10%, #10182f 0%, var(--deep-bg) 85%);
      background-color: var(--deep-bg);
      color: var(--body-text);
      line-height: 1.7;
      font-size: 1.05rem;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 背景纹理网格线条 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: linear-gradient(rgba(0, 194, 255, 0.04) 1px, transparent 1px),
                        linear-gradient(90deg, rgba(0, 194, 255, 0.04) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: -2;
    }

    /* 玻璃拟态通用卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(18px) saturate(140%);
      -webkit-backdrop-filter: blur(18px) saturate(140%);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      border-color: var(--electric-blue);
      box-shadow: 0 16px 40px rgba(0, 194, 255, 0.38);
      transform: translateY(-5px);
    }

    h2 {
      font-size: 2.3rem;
      font-weight: 700;
      letter-spacing: 0.02em;
      color: var(--white);
      margin-bottom: 1.2rem;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      display: block;
      width: 70px;
      height: 4px;
      background: linear-gradient(90deg, var(--electric-blue), var(--neon-purple));
      margin-top: 0.4rem;
      border-radius: 4px;
    }
    h3 {
      color: var(--white);
    }

    /* 按钮体系 */
    .btn-primary {
      background: linear-gradient(135deg, #00C2FF, #A855F7);
      color: white;
      font-weight: 600;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 18px rgba(0,194,255,0.35);
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 32px rgba(0,194,255,0.8);
      transform: scale(1.04);
      background: linear-gradient(135deg, #38d0ff, #b877ff);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--electric-blue);
      color: var(--electric-blue);
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      transition: var(--transition-smooth);
      cursor: pointer;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,194,255,0.1);
      box-shadow: 0 0 18px rgba(0,194,255,0.4);
    }

    .btn-submit {
      background: linear-gradient(135deg, #00F0B5, #00C2FF);
      color: #0A0E1A;
      font-weight: 700;
      border: none;
      box-shadow: 0 6px 18px rgba(0,240,181,0.35);
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(10, 14, 26, 0.8);
      backdrop-filter: blur(25px);
      -webkit-backdrop-filter: blur(25px);
      border-bottom: 1px solid rgba(0,194,255,0.25);
      z-index: 999;
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      background: linear-gradient(135deg, #00C2FF, #A855F7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 0.03em;
      text-decoration: none;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      color: #B0C4DE;
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      font-size: 1rem;
    }
    .nav-links a:hover {
      color: #00C2FF;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 2rem;
      cursor: pointer;
    }

    /* Hero 看板 */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      min-height: 85vh;
      padding-top: 90px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      font-size: 3.4rem;
      font-weight: 700;
      background: linear-gradient(to right, #00C2FF, #b280ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }
    .dashboard-card {
      flex: 1;
      background: rgba(15, 26, 50, 0.7);
      backdrop-filter: blur(20px);
      border-radius: 28px;
      padding: 26px;
      border: 1px solid rgba(0,194,255,0.3);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-blend-mode: overlay;
    }
    .metric {
      font-family: var(--font-mono);
    }
    .metric-number {
      font-size: 2.55rem;
      font-weight: 700;
      color: #00F0B5;
    }

    /* 网格卡片公用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    /* 对比区 */
    .compare-row {
      display: flex;
      gap: 30px;
      align-items: center;
    }
    .vs-badge {
      background: rgba(0,194,255,0.2);
      border-radius: 50%;
      width: 60px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: #00C2FF;
    }

    /* FAQ 双列 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: rgba(15,25,50,0.55);
      border-radius: 14px;
      padding: 18px 22px;
    }

    footer {
      background: #060B17;
      padding: 50px 0 25px;
    }

    @media (max-width: 768px) {
      .hero-grid, .compare-row, .grid-3, .service-grid, .faq-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
    }