/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --secondary: #00F0FF;
      --bg-dark: #0A0E17;
      --bg-card: #111827;
      --text-light: #B0B8C1;
      --text-white: #FFFFFF;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --radius-lg: 16px;
      --radius-btn: 12px;
      --shadow-glow: 0 0 20px rgba(123, 47, 247, 0.6);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-dark);
      color: var(--text-light);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      font-size: 16px;
    }

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

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

    button, input {
      font-family: inherit;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      box-shadow: 0 12px 40px rgba(123, 47, 247, 0.25);
      border-color: rgba(0, 240, 255, 0.2);
      transform: translateY(-2px);
    }

    /* 发光按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      box-shadow: var(--shadow-glow);
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: #8B4FFF;
      box-shadow: 0 0 30px rgba(123, 47, 247, 0.9);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--secondary);
      color: var(--secondary);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      color: white;
      border-color: white;
    }

    /* 导航样式 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 14, 23, 0.8);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .nav-brand {
      font-weight: 800;
      font-size: 1.8rem;
      background: linear-gradient(135deg, #7B2FF7 0%, #00F0FF 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }

    .nav-link {
      color: #B0B8C1;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
    }

    .nav-link:hover {
      color: var(--secondary);
    }

    .nav-link.active {
      color: var(--secondary);
      border-bottom: 2px solid var(--secondary);
      padding-bottom: 4px;
    }

    /* 移动端频道滚动 */
    .channel-scroll {
      overflow-x: auto;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }

    .channel-scroll::-webkit-scrollbar {
      display: none;
    }

    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }

    .faq-question {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      font-weight: 600;
      font-size: 18px;
      color: white;
      transition: color 0.2s;
    }

    .faq-question:hover {
      color: var(--secondary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: #B0B8C1;
      font-size: 16px;
      line-height: 1.7;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    .faq-icon {
      color: var(--secondary);
      font-size: 20px;
      transition: transform 0.2s;
    }

    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* 数字动画 */
    .stat-number {
      font-weight: 700;
      font-size: 40px;
      background: linear-gradient(135deg, #7B2FF7, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    @media (max-width: 640px) {
      .stat-number {
        font-size: 32px;
      }
      h1 {
        font-size: 32px !important;
      }
      h2 {
        font-size: 26px !important;
      }
    }

    /* 背景图区域 */
    .hero-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .hero-bg::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(10, 14, 23, 0.7);
      backdrop-filter: blur(2px);
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .section-padding {
      padding: 100px 0;
    }

    @media (max-width: 640px) {
      .section-padding {
        padding: 60px 0;
      }
    }