/* roulang page: index */
:root {
      --primary-bg: #0A0E27;
      --secondary-bg: #1A1F3A;
      --card-bg: rgba(26, 31, 58, 0.7);
      --border-color: rgba(0, 240, 255, 0.12);
      --accent-cyan: #00F0FF;
      --accent-magenta: #FF2D78;
      --text-primary: #E0E6FF;
      --text-secondary: #8A8FB0;
      --text-dark: #0A0E27;
      --button-gradient: linear-gradient(135deg, #FF2D78 0%, #FF6B9D 100%);
      --glow-cyan: 0 4px 20px rgba(0, 240, 255, 0.3);
      --glow-magenta: 0 4px 20px rgba(255, 45, 120, 0.4);
      --border-radius-lg: 16px;
      --border-radius-md: 12px;
      --border-radius-sm: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-mono: "Inter", "SF Pro Display", sans-serif;
      --section-gap: 120px;
      --container-max: 1280px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--primary-bg);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.1);
      transition: background 0.3s ease;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--accent-cyan);
      letter-spacing: -0.01em;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 28px;
      color: var(--accent-magenta);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 8px 0;
      transition: color 0.3s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s ease;
    }
    .nav-link:hover {
      color: var(--accent-cyan);
    }
    .nav-link:hover::after {
      width: 100%;
    }

    .btn-primary-sm {
      background: var(--button-gradient);
      color: #fff;
      padding: 10px 24px;
      border-radius: 50px;
      font-weight: 700;
      box-shadow: var(--glow-magenta);
      transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      font-size: 14px;
    }
    .btn-primary-sm:hover {
      box-shadow: 0 6px 25px rgba(255,45,120,0.6);
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--accent-cyan);
      transition: 0.3s;
    }

    /* Hero */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 50%, #1A1F3A 0%, #0A0E27 70%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 800 600"><defs><radialGradient id="g1" cx="20%" cy="80%" r="40%"><stop offset="0%" stop-color="rgba(0,240,255,0.15)"/><stop offset="100%" stop-color="transparent"/></radialGradient></defs><circle cx="200" cy="500" r="300" fill="url(/%23g1)"/></svg>') center/cover no-repeat;
      opacity: 0.8;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero h1 {
      font-size: clamp(36px, 6vw, 56px);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.15;
      margin-bottom: 24px;
      background: linear-gradient(to right, #fff, #E0E6FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 600px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--button-gradient);
      color: #fff;
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 700;
      box-shadow: var(--glow-magenta);
      transition: all 0.3s ease;
    }
    .btn-primary:hover {
      box-shadow: 0 8px 30px rgba(255,45,120,0.7);
      transform: translateY(-3px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 20px rgba(0,240,255,0.3);
    }

    /* 通用板块 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.01em;
    }
    .section-sub {
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 16px;
    }

    /* 核心优势网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .feature-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius-lg);
      padding: 32px;
      transition: all 0.3s ease;
    }
    .feature-card:hover {
      box-shadow: 0 8px 30px rgba(0,240,255,0.15);
      border-color: rgba(0,240,255,0.3);
    }
    .feature-icon {
      font-size: 32px;
      color: var(--accent-cyan);
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }
    .feature-card p {
      color: var(--text-secondary);
    }

    /* 功能分组切换 */
    .function-tabs {
      display: flex;
      gap: 40px;
    }
    .tab-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      min-width: 200px;
    }
    .tab-item {
      padding: 12px 16px;
      border-radius: var(--border-radius-sm);
      font-weight: 500;
      color: var(--text-secondary);
      cursor: pointer;
      transition: 0.2s;
      border-left: 3px solid transparent;
    }
    .tab-item.active {
      background: rgba(0,240,255,0.05);
      color: var(--accent-cyan);
      border-left-color: var(--accent-cyan);
    }
    .tab-content {
      flex: 1;
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius-lg);
      padding: 32px;
    }

    /* 场景卡片 */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .scene-card {
      background: #1A1F3A;
      border-radius: var(--border-radius-lg);
      overflow: hidden;
      transition: 0.3s;
    }
    .scene-card:hover {
      box-shadow: 0 8px 24px rgba(0,240,255,0.2);
    }
    .scene-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .scene-info {
      padding: 20px;
    }

    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius-lg);
      padding: 32px;
      text-align: center;
    }
    .case-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent-magenta);
    }

    /* 价格卡片 */
    .price-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: center;
    }
    .price-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--border-radius-lg);
      padding: 32px;
      text-align: center;
    }
    .price-card.featured {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 25px rgba(0,240,255,0.25);
      transform: scale(1.03);
    }
    .price-amount {
      font-size: 48px;
      font-weight: 800;
      color: #fff;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid rgba(0,240,255,0.08);
    }
    .faq-question {
      background: #1A1F3A;
      padding: 18px 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 20px 20px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0A0E27 0%, #1A2F5A 100%);
      text-align: center;
      padding: 80px 24px;
    }

    /* 页脚 */
    .footer {
      background: #060A1A;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-menu {
        display: none;
      }
      .features-grid, .case-grid, .price-grid {
        grid-template-columns: 1fr;
      }
      .scene-grid {
        grid-template-columns: 1fr;
      }
      .function-tabs {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }