/* roulang page: index */
:root {
      --deep-blue: #0A1128;
      --cyan: #00F0FF;
      --orange: #FF6B35;
      --dark-card: #1A1F2E;
      --mid-gray: #8A94A6;
      --light-gray: #F0F2F5;
      --glass-bg: rgba(26, 31, 46, 0.7);
      --glass-border: rgba(0, 240, 255, 0.15);
      --cyan-glow: 0 0 20px rgba(0, 240, 255, 0.5);
      --cyan-glow-hover: 0 0 30px rgba(0, 240, 255, 0.8);
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4);
      --border-radius-lg: 16px;
      --border-radius-md: 12px;
      --border-radius-sm: 8px;
      --font-sans: 'Inter', 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'DIN Alternate', 'Inter', monospace;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--deep-blue);
      color: #E0E4EC;
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
      background-image: radial-gradient(circle at 30% 20%, rgba(0,240,255,0.03) 0%, transparent 50%);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3 {
      font-weight: 700;
      line-height: 1.3;
    }
    h2 {
      font-size: 40px;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
      color: white;
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
      color: white;
    }
    a {
      color: var(--cyan);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: white;
      text-shadow: 0 0 8px rgba(0,240,255,0.6);
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      font-weight: 600;
      transition: var(--transition);
      border: none;
      background: transparent;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 17, 40, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,240,255,0.1);
      transition: background 0.3s;
    }
    .nav {
      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;
      color: white;
      letter-spacing: -0.5px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--cyan);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2"><path d="M22 12h-4l-3 9L9 3l-3 9H2"/></svg>') center/contain no-repeat;
      background: var(--cyan);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--mid-gray);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--cyan);
    }
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 20px;
      left: 20px;
      right: 20px;
      background: rgba(10,17,40,0.9);
      backdrop-filter: blur(24px);
      border-radius: 40px;
      padding: 12px 20px;
      justify-content: space-around;
      border: 1px solid rgba(0,240,255,0.2);
      z-index: 55;
    }
    .mobile-nav a {
      color: var(--mid-gray);
      font-size: 0.8rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
    }
    .mobile-nav .cta-mobile {
      background: var(--cyan);
      color: #0A1128;
      padding: 8px 18px;
      border-radius: 30px;
      font-weight: 700;
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-title {
      font-size: 56px;
      font-weight: 900;
      letter-spacing: -1px;
      line-height: 1.1;
      margin-bottom: 24px;
      color: white;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--mid-gray);
      margin-bottom: 40px;
      max-width: 450px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cyan);
      color: #0A1128;
      padding: 16px 36px;
      border-radius: 40px;
      font-weight: 700;
      box-shadow: var(--cyan-glow);
    }
    .btn-primary:hover {
      box-shadow: var(--cyan-glow-hover);
      background: #33f5ff;
    }
    .btn-ghost {
      border: 1px solid var(--cyan);
      color: var(--cyan);
      padding: 16px 36px;
      border-radius: 40px;
      font-weight: 600;
    }
    .btn-ghost:hover {
      background: rgba(0,240,255,0.1);
    }
    .data-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      padding: 28px;
      transform: perspective(800px) rotateY(-3deg);
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .live-badge {
      color: var(--orange);
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .stat-row {
      display: flex;
      justify-content: space-between;
      color: var(--mid-gray);
    }
    .stat-highlight {
      font-family: var(--font-mono);
      font-size: 2rem;
      color: var(--cyan);
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-header {
      margin-bottom: 60px;
      text-align: center;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 28px;
    }
    .feature-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius-lg);
      padding: 32px;
      transition: all 0.3s;
    }
    .feature-card:hover {
      border-color: var(--cyan);
      transform: translateY(-4px);
      box-shadow: 0 12px 40px rgba(0,0,0,0.5);
    }
    .tech-tag {
      background: var(--orange);
      color: white;
      font-size: 0.7rem;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 16px;
    }
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
    }
    .scenario-card {
      background: #1A1F2E;
      border-radius: 20px;
      overflow: hidden;
      transition: 0.3s;
    }
    .scenario-card:hover {
      transform: translateY(-6px);
    }
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
    }
    .case-card {
      min-width: 280px;
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      border-radius: 20px;
      padding: 24px;
      border: 1px solid rgba(0,240,255,0.2);
    }
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .price-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border-radius: 24px;
      padding: 40px 28px;
      border: 1px solid rgba(255,255,255,0.08);
    }
    .price-card.featured {
      border: 2px solid var(--cyan);
      position: relative;
    }
    .popular-badge {
      position: absolute;
      top: -14px;
      right: 30px;
      background: var(--orange);
      padding: 6px 20px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 0.8rem;
    }
    .faq-item {
      background: rgba(26,31,46,0.6);
      border-radius: 16px;
      margin-bottom: 12px;
      border: 1px solid transparent;
      transition: 0.2s;
    }
    .faq-item.active {
      border-color: var(--cyan);
    }
    .contact-form input, .contact-form textarea {
      background: rgba(10,17,40,0.8);
      border: 1px solid rgba(0,240,255,0.2);
      border-radius: 12px;
      padding: 16px;
      width: 100%;
      color: white;
      margin-bottom: 16px;
    }
    .contact-form input:focus {
      border-color: var(--cyan);
      box-shadow: 0 0 10px rgba(0,240,255,0.3);
    }
    footer {
      padding: 40px 0;
      border-top: 1px solid rgba(255,255,255,0.05);
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .scenario-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-nav { display: flex; }
      .hero-title { font-size: 36px; }
      h2 { font-size: 30px; }
      .grid-4, .pricing-grid, .scenario-grid { grid-template-columns: 1fr; }
      section { padding: 70px 0; }
    }