/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --accent-cyan: #00F0FF;
      --alert-red: #FF3D71;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-border: rgba(0, 240, 255, 0.3);
      --text-primary: #EAF0FF;
      --text-secondary: #8E9BB5;
      --text-muted: #4A5568;
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.4);
      --font-sans: 'Inter', 'SF Pro Text', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --transition: all 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--primary-deep);
    }

    body {
      font-family: var(--font-sans);
      background: var(--primary-deep);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航栏 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.15);
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.5px;
      color: var(--text-primary);
      white-space: nowrap;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--accent-cyan);
      filter: drop-shadow(0 0 8px rgba(0,240,255,0.6));
    }
    .logo span {
      background: linear-gradient(135deg, #fff 0%, #b0f0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.2s ease;
    }
    .nav-links a:hover {
      color: #fff;
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--accent-cyan);
      color: #0A0E27;
      font-weight: 700;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      box-shadow: var(--shadow-glow);
      letter-spacing: 0.3px;
      font-size: 0.9rem;
    }
    .btn-primary:hover {
      background: #66f7ff;
      box-shadow: 0 0 28px rgba(0,240,255,0.7);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
    }
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      border-color: #fff;
      color: #fff;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--accent-cyan);
      font-size: 1.8rem;
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 40px 0;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(0,240,255,0.08) 0%, rgba(10,14,39,0.85) 90%);
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-left h1 {
      font-weight: 800;
      font-size: clamp(2.5rem, 5vw, 4rem);
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 24px;
      background: linear-gradient(to right, #fff, #a0ecff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-left p {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 90%;
    }
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .hero-right {
      display: flex;
      justify-content: center;
    }
    .glass-dashboard {
      background: rgba(10, 20, 40, 0.5);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(0,240,255,0.25);
      border-radius: 24px;
      padding: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      width: 100%;
      max-width: 500px;
    }
    .dashboard-mock {
      background: rgba(0,240,255,0.05);
      border-radius: 12px;
      padding: 16px;
    }
    .data-row {
      display: flex;
      justify-content: space-between;
      margin: 16px 0;
      font-family: var(--font-mono);
    }
    .data-value {
      color: var(--accent-cyan);
      font-weight: 700;
    }

    /* Section通用 */
    section {
      padding: 80px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-header h2 {
      font-weight: 700;
      font-size: clamp(2rem, 4vw, 3rem);
      color: #fff;
      margin-bottom: 16px;
    }
    .section-header p {
      color: var(--text-secondary);
      font-size: 1.1rem;
    }

    /* 非对称网格亮点 */
    .highlights-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 24px;
    }
    .highlight-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      transition: var(--transition);
    }
    .highlight-card:hover {
      backdrop-filter: blur(25px);
      border-color: var(--glass-hover-border);
      transform: translateY(-5px);
    }
    .highlight-card i {
      font-size: 2.2rem;
      color: var(--accent-cyan);
      margin-bottom: 20px;
    }
    .card-stat {
      font-family: var(--font-mono);
      font-size: 2rem;
      color: var(--alert-red);
      font-weight: 700;
    }

    /* 案例瀑布流 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 20px;
    }
    .case-card {
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(16px);
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.05);
      transition: 0.3s;
    }
    .case-card:hover {
      border-color: var(--accent-cyan);
      transform: scale(1.02);
    }
    .case-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .case-info {
      padding: 20px;
    }

    /* 方案对比 */
    .plans-row {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .plan-card {
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      padding: 32px;
      flex: 1 1 280px;
      max-width: 320px;
    }
    .plan-card.recommended {
      border: 2px solid var(--accent-cyan);
      box-shadow: 0 0 30px rgba(0,240,255,0.3);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #0A0E27 0%, #111b3d 100%);
      text-align: center;
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero .container {
        grid-template-columns: 1fr;
      }
      .highlights-grid {
        grid-template-columns: 1fr 1fr;
      }
      .case-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .highlights-grid, .case-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .plans-row {
        flex-direction: column;
        align-items: center;
      }
    }