/* roulang page: index */
:root {
      --primary-purple: #7C3AED;
      --primary-cyan: #06D6A0;
      --accent-orange: #FF6B35;
      --dark-bg: #0F0A1A;
      --dark-surface: rgba(20, 12, 30, 0.8);
      --card-bg: rgba(255, 255, 255, 0.03);
      --white: #F8F9FA;
      --gray-light: #CED4DA;
      --gray-mid: #6C757D;
      --gray-dark: #212529;
      --border-light: rgba(255, 255, 255, 0.08);
      --border-cyan: rgba(6, 214, 160, 0.4);
      --shadow-purple: 0 4px 24px rgba(124, 58, 237, 0.15);
      --shadow-purple-hover: 0 8px 32px rgba(124, 58, 237, 0.35);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 20% 10%, #1a0f2e, #0a0512 90%);
      color: var(--gray-light);
      line-height: 1.5;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    .grid-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(15, 10, 26, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 50;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, #06D6A0 0%, #7C3AED 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }

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

    .nav-links a {
      color: var(--gray-light);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--primary-cyan);
    }

    .nav-links a.active {
      color: var(--primary-cyan);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-cyan);
      box-shadow: 0 0 12px var(--primary-cyan);
    }

    .nav-cta {
      background: var(--primary-purple);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.9rem;
      transition: all 0.25s;
      border: none;
      cursor: pointer;
    }

    .nav-cta:hover {
      background: #8b5cf6;
      box-shadow: 0 0 16px rgba(124, 58, 237, 0.6);
      color: white;
    }

    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(10, 5, 18, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        z-index: 40;
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
    }

    h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    @media (max-width: 640px) {
      h2 {
        font-size: 1.9rem;
      }
      section {
        padding: 60px 0;
      }
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      background: radial-gradient(ellipse at 30% 40%, #1c0e36 0%, #07030f 80%);
      overflow: hidden;
      padding-top: 72px;
    }

    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 500px;
      z-index: 2;
    }

    .hero h1 {
      font-size: 3rem;
      font-weight: 800;
      background: linear-gradient(to right, #06D6A0, #b284ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: #adb5bd;
      margin-bottom: 28px;
    }

    .badge-group {
      display: flex;
      gap: 16px;
      margin-bottom: 32px;
      flex-wrap: wrap;
    }

    .badge {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 40px;
      padding: 8px 20px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: white;
    }

    .badge strong {
      color: var(--primary-cyan);
      font-size: 1.2rem;
      margin-right: 4px;
    }

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

    .btn-primary {
      background: linear-gradient(135deg, #06D6A0, #0B9E7A);
      color: #0a0512;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      border: none;
      transition: all 0.25s;
      font-size: 1rem;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      box-shadow: 0 0 24px rgba(6,214,160,0.7);
      transform: translateY(-2px);
      color: #0a0512;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-cyan);
      color: var(--primary-cyan);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: 0.2s;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: rgba(6,214,160,0.12);
      color: white;
    }

    .hero-image {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
      position: relative;
    }

    .hero-image img {
      max-width: 100%;
      border-radius: 24px;
      box-shadow: 0 0 40px rgba(124,58,237,0.5);
      filter: drop-shadow(0 0 20px #7C3AED);
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.2rem;
      }
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .badge-group {
        justify-content: center;
      }
      .btn-group {
        justify-content: center;
      }
    }

    /* 卡片通用 */
    .card {
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px;
      transition: all 0.3s;
    }

    .card:hover {
      border-color: var(--border-cyan);
      box-shadow: var(--shadow-purple-hover);
    }

    .icon-lg {
      font-size: 2.8rem;
      color: var(--primary-cyan);
      margin-bottom: 20px;
    }

    /* 功能分组图文 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }

    .feature-row.reverse {
      flex-direction: row-reverse;
    }

    .feature-text {
      flex: 1;
    }

    .feature-img {
      flex: 1;
    }

    .feature-img img {
      border-radius: var(--radius-lg);
      box-shadow: 0 0 30px rgba(124,58,237,0.3);
    }

    @media (max-width: 768px) {
      .feature-row, .feature-row.reverse {
        flex-direction: column;
      }
    }

    /* 案例横向滚动 */
    .case-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }

    .case-card {
      min-width: 280px;
      background: rgba(20,12,30,0.7);
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-light);
    }

    .case-badge {
      background: var(--accent-orange);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-top: 12px;
    }

    /* 价格卡 */
    .pricing-grid {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 32px;
    }

    .price-card {
      background: rgba(255,255,255,0.02);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      flex: 1 1 260px;
      max-width: 320px;
      transition: 0.2s;
    }

    .price-card.featured {
      border: 2px solid var(--primary-cyan);
      box-shadow: 0 0 28px rgba(6,214,160,0.25);
    }

    .price {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary-cyan);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 24px;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 16px 0;
    }

    .faq-question {
      font-weight: 700;
      color: white;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      color: #adb5bd;
      margin-top: 8px;
      display: none;
    }

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

    /* 最终CTA */
    .cta-section {
      background: linear-gradient(135deg, #7C3AED, #06D6A0);
      padding: 80px 20px;
      text-align: center;
      border-radius: 0;
    }

    .cta-section h2 {
      color: white;
    }

    .footer {
      background: #0a0512;
      padding: 48px 20px 24px;
      border-top: 1px solid rgba(255,255,255,0.05);
    }

    .footer a:hover {
      color: var(--primary-cyan);
    }