/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --purple-electric: #6C5CE7;
      --cyan-neon: #00D2FF;
      --accent-red: #FF6B6B;
      --card-bg: rgba(19, 24, 64, 0.6);
      --card-hover: #1A1F52;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8D1;
      --text-muted: #7B83A6;
      --border-glow: rgba(108, 92, 231, 0.25);
      --border-hover: rgba(0, 210, 255, 0.4);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 12px 40px rgba(108, 92, 231, 0.3);
      --transition: 0.3s ease;
      --max-width: 1280px;
      --nav-height: 72px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
      background-color: var(--primary-deep);
      color: var(--text-secondary);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    h1, h2, h3 {
      color: var(--text-primary);
      font-weight: 700;
    }

    h1 {
      font-size: 44px;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-size: 32px;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 20px;
      font-weight: 600;
    }

    p {
      max-width: 680px;
      color: var(--text-secondary);
    }

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

    a:hover {
      color: var(--cyan-neon);
    }

    img {
      max-width: 100%;
      display: block;
      border-radius: var(--radius-lg);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      transition: all var(--transition);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(rgba(108, 92, 231, 0.3), transparent);
      background-position: bottom;
      background-size: 100% 1px;
      background-repeat: no-repeat;
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }

    .logo i {
      color: var(--cyan-neon);
      font-size: 24px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan-neon);
      transition: width var(--transition);
      box-shadow: 0 0 8px var(--cyan-neon);
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--purple-electric), var(--cyan-neon));
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-md);
      box-shadow: 0 0 24px rgba(108, 92, 231, 0.5);
      font-weight: 600;
    }

    .btn-primary:hover {
      box-shadow: 0 0 40px rgba(0, 210, 255, 0.6);
      transform: scale(1.03);
      color: white;
    }

    .btn-outline {
      border: 1px solid var(--purple-electric);
      color: var(--text-primary);
      padding: 10px 24px;
      border-radius: var(--radius-md);
      background: rgba(108, 92, 231, 0.1);
    }

    .btn-outline:hover {
      background: rgba(108, 92, 231, 0.3);
      border-color: var(--cyan-neon);
      color: white;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
    }

    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--text-primary);
      transition: var(--transition);
    }

    /* 板块间距 */
    .section {
      padding: 100px 0;
    }

    @media (max-width: 768px) {
      .section {
        padding: 60px 0;
      }
      h1 {
        font-size: 36px;
      }
      h2 {
        font-size: 28px;
      }
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 50%, rgba(108, 92, 231, 0.08), transparent 70%);
      position: relative;
      overflow: hidden;
    }

    .stars {
      position: absolute;
      width: 100%;
      height: 100%;
      background: radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,0.4), transparent),
                  radial-gradient(1px 1px at 80% 70%, rgba(0,210,255,0.5), transparent),
                  radial-gradient(2px 2px at 40% 80%, rgba(108,92,231,0.6), transparent);
      background-size: 300px 300px;
      opacity: 0.6;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      position: relative;
      z-index: 2;
    }

    .hero-left {
      flex: 1;
    }

    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }

    .hero-dashboard {
      background: rgba(19, 24, 64, 0.7);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 20px;
      box-shadow: var(--shadow-glow);
    }

    .hero-metrics {
      display: flex;
      gap: 32px;
      margin: 32px 0;
    }

    .metric-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--cyan-neon);
      line-height: 1.1;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    .cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* 核心优势 错位排版 */
    .advantages-grid {
      display: flex;
      flex-direction: column;
      gap: 48px;
    }

    .adv-item {
      display: flex;
      align-items: center;
      gap: 40px;
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }

    .adv-item:hover {
      box-shadow: var(--shadow-glow);
      border-color: var(--border-hover);
      transform: translateY(-4px);
    }

    .adv-item:nth-child(1) { width: 60%; }
    .adv-item:nth-child(2) { width: 60%; align-self: flex-end; }
    .adv-item:nth-child(3) { width: 70%; align-self: center; }

    .adv-icon {
      font-size: 36px;
      background: linear-gradient(135deg, var(--purple-electric), var(--cyan-neon));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 功能矩阵 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }

    .feature-img {
      flex: 1;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-glow);
      overflow: hidden;
    }

    .feature-text {
      flex: 1;
    }

    .feature-list {
      list-style: none;
      margin-top: 16px;
    }

    .feature-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .feature-list li::before {
      content: "●";
      color: var(--cyan-neon);
      font-size: 12px;
    }

    /* 场景卡片 */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .scene-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: var(--transition);
    }

    .scene-card:hover {
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }

    .scene-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .scene-content {
      padding: 24px;
    }

    .tag {
      background: rgba(108, 92, 231, 0.3);
      color: var(--cyan-neon);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      display: inline-block;
      margin-top: 8px;
    }

    /* 案例网格 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 32px;
    }

    .case-highlight {
      font-size: 36px;
      font-weight: 800;
      color: var(--cyan-neon);
    }

    /* 价格 */
    .pricing-grid {
      display: flex;
      justify-content: center;
      gap: 24px;
      flex-wrap: wrap;
    }

    .price-card {
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-lg);
      padding: 40px;
      flex: 1;
      min-width: 260px;
      max-width: 320px;
      transition: var(--transition);
      position: relative;
    }

    .price-card.recommended {
      border-color: var(--purple-electric);
      box-shadow: 0 0 30px rgba(108, 92, 231, 0.5);
      transform: scale(1.05);
    }

    .badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--purple-electric);
      color: white;
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 14px;
    }

    .price-amount {
      font-size: 48px;
      font-weight: 800;
      color: var(--text-primary);
    }

    /* FAQ */
    .faq-item {
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      background: var(--card-bg);
      backdrop-filter: blur(16px);
      transition: var(--transition);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-primary);
    }

    .faq-answer {
      padding: 0 24px 20px;
      display: none;
      color: var(--text-secondary);
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    .faq-item.open {
      border-color: var(--border-hover);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1F52 50%, #0A0E27 100%);
      text-align: center;
      padding: 80px 24px;
      border-radius: var(--radius-lg);
      margin: 100px 0;
    }

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

    .footer-bottom {
      border-top: 1px solid rgba(108, 92, 231, 0.2);
      margin-top: 40px;
      padding-top: 24px;
      color: var(--text-muted);
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .feature-row {
        flex-direction: column;
      }
      .advantages-grid .adv-item {
        width: 100% !important;
      }
      .scene-grid {
        grid-template-columns: 1fr;
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .pricing-grid {
        flex-direction: column;
        align-items: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }