/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --accent-cyan: #00F0B5;
      --bg-deep: #0A0E17;
      --bg-card: rgba(20, 25, 40, 0.65);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.7);
      --border-purple: rgba(123, 47, 247, 0.25);
      --border-cyan: rgba(0, 240, 181, 0.2);
      --glass-blur: blur(18px);
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-glow: 0 0 24px rgba(123, 47, 247, 0.6);
      --shadow-cyan: 0 0 40px rgba(0, 240, 181, 0.8);
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .english, .data-number {
      font-family: 'Inter', 'SF Pro Display', sans-serif;
    }
    
    a {
      color: var(--accent-cyan);
      text-decoration: none;
      transition: color 0.25s ease;
    }
    
    a:hover {
      color: var(--primary-purple);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 16px;
    }
    
    /* 玻璃拟态卡片基础 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-purple);
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.25s;
    }
    
    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 8px 32px rgba(123, 47, 247, 0.25);
      border-color: var(--accent-cyan);
    }
    
    /* 导航栏 */
    #main-nav {
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-purple);
      padding: 0.8rem 0;
      position: sticky;
      top: 0;
      z-index: 100;
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 16px;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--accent-cyan);
      letter-spacing: 0.5px;
    }
    
    .logo i {
      font-size: 1.8rem;
      color: var(--primary-purple);
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-wrap: wrap;
    }
    
    .nav-chip {
      background: transparent;
      color: var(--text-secondary);
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 500;
      transition: all 0.2s ease;
      border: 1px solid transparent;
    }
    
    .nav-chip:hover {
      color: var(--text-primary);
      background: rgba(123, 47, 247, 0.2);
    }
    
    .nav-chip.active {
      background: var(--primary-purple);
      color: white;
      border-color: var(--primary-purple);
      box-shadow: 0 0 12px rgba(123, 47, 247, 0.5);
    }
    
    .btn-ghost {
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      background: transparent;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
    }
    
    .btn-ghost:hover {
      background: rgba(0, 240, 181, 0.15);
      color: var(--accent-cyan);
      box-shadow: 0 0 20px rgba(0, 240, 181, 0.4);
    }
    
    .btn-primary {
      background: var(--primary-purple);
      color: white;
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: var(--shadow-glow);
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }
    
    .btn-primary:hover {
      background: var(--accent-cyan);
      color: #0A0E17;
      box-shadow: var(--shadow-cyan);
    }
    
    /* 汉堡菜单定制 */
    .menu-icon {
      background: transparent;
      color: white;
    }
    
    .off-canvas {
      background: #0A0E17;
    }
    
    /* Hero 区域 */
    #hero {
      padding: 80px 0;
      background-image: radial-gradient(circle at 30% 40%, rgba(123,47,247,0.15) 0%, transparent 50%);
      position: relative;
      overflow: hidden;
    }
    
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    
    .hero-text {
      flex: 1 1 55%;
    }
    
    .hero-image {
      flex: 1 1 45%;
      position: relative;
    }
    
    .hero-image img {
      border-radius: 24px;
      border: 1px solid var(--border-purple);
      width: 100%;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }
    
    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(123,47,247,0.3), rgba(0,240,181,0.2));
      border-radius: 24px;
      mix-blend-mode: overlay;
      pointer-events: none;
    }
    
    h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1.2rem;
    }
    
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
    }
    
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 2.5rem;
      text-align: center;
      position: relative;
    }
    
    .section-title::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background: var(--accent-cyan);
      margin: 12px auto 0;
      border-radius: 2px;
    }
    
    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .adv-card {
      text-align: center;
      padding: 2rem 1.5rem;
    }
    
    .icon-circle {
      width: 56px;
      height: 56px;
      background: rgba(123,47,247,0.25);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1.2rem;
      transition: background 0.3s;
    }
    
    .adv-card:hover .icon-circle {
      background: var(--accent-cyan);
    }
    
    .adv-card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 0.8rem;
    }
    
    .adv-desc {
      color: var(--text-secondary);
      font-size: 14px;
    }
    
    .accent-line {
      width: 40px;
      height: 2px;
      background: var(--accent-cyan);
      margin: 1rem auto 0;
    }
    
    /* 数据瀑布 */
    #data {
      background: #0F1520;
    }
    
    .data-grid {
      display: flex;
      gap: 40px;
      align-items: center;
    }
    
    .data-left {
      flex: 1;
    }
    
    .big-number {
      font-size: 64px;
      font-weight: 700;
      color: var(--accent-cyan);
      line-height: 1;
    }
    
    .progress-bars {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    
    .progress-item label {
      display: flex;
      justify-content: space-between;
      margin-bottom: 6px;
      font-weight: 500;
    }
    
    .progress-bg {
      background: #2A2F3A;
      height: 8px;
      border-radius: 4px;
      overflow: hidden;
    }
    
    .progress-fill {
      height: 100%;
      background: linear-gradient(90deg, var(--primary-purple), var(--accent-cyan));
      border-radius: 4px;
      box-shadow: 0 0 10px rgba(123,47,247,0.5);
      width: 0%;
    }
    
    /* 对比表 */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: start;
    }
    
    .plan-card {
      padding: 2rem;
      position: relative;
      background: var(--bg-card);
      backdrop-filter: var(--glass-blur);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-purple);
    }
    
    .plan-pro {
      border: 2px solid var(--accent-cyan);
      box-shadow: 0 0 28px rgba(0,240,181,0.3);
    }
    
    .badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--primary-purple);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
    }
    
    .plan-features {
      list-style: none;
      margin: 1.5rem 0;
    }
    
    .plan-features li {
      margin-bottom: 0.8rem;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    
    /* FAQ */
    .accordion {
      background: transparent;
    }
    
    .accordion-item {
      background: var(--bg-card);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-purple);
      border-radius: 12px;
      margin-bottom: 12px;
    }
    
    .accordion-title {
      font-size: 1.1rem;
      font-weight: 600;
      padding: 1.2rem 1.5rem;
      color: white;
      background: transparent;
      border: none;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    
    .accordion-title::before {
      content: "\f0e7";
      font-family: 'Font Awesome 6 Free';
      font-weight: 900;
      color: var(--accent-cyan);
    }
    
    .accordion-content {
      background: rgba(123,47,247,0.08);
      color: rgba(255,255,255,0.8);
      padding: 0 1.5rem 1.2rem;
      border: none;
    }
    
    /* CTA 尾屏 */
    #contact {
      background: #070A10;
      text-align: center;
    }
    
    .subscribe-form {
      display: flex;
      max-width: 500px;
      margin: 2rem auto;
      gap: 10px;
    }
    
    .subscribe-form input {
      flex: 1;
      background: #1A1F2B;
      border: 1px solid var(--border-purple);
      border-radius: 50px;
      padding: 14px 20px;
      color: white;
      font-size: 16px;
    }
    
    .social-icons {
      display: flex;
      justify-content: center;
      gap: 24px;
      margin-top: 2rem;
      font-size: 1.6rem;
    }
    
    /* 页脚 */
    footer {
      background: #0A0E17;
      padding: 3rem 0 1.5rem;
      border-top: 1px solid var(--border-purple);
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      margin-bottom: 2rem;
    }
    
    .footer-bottom {
      text-align: center;
      color: var(--text-secondary);
      font-size: 0.9rem;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 640px) {
      h1 {
        font-size: 32px;
      }
      .section-title {
        font-size: 28px;
      }
      .advantages-grid,
      .comparison-grid,
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .data-grid {
        flex-direction: column;
      }
      .subscribe-form {
        flex-direction: column;
      }
      .btn-group {
        flex-direction: column;
        width: 100%;
      }
      .btn-group .btn-primary,
      .btn-group .btn-ghost {
        width: 100%;
        text-align: center;
      }
    }