/* roulang page: index */
:root {
      --primary: #8B3FCF;
      --primary-dark: #7B2FBE;
      --accent: #00F0B5;
      --bg-deep: #0A0A0F;
      --bg-card: #13131A;
      --border-color: #1A1A24;
      --text-main: #FFFFFF;
      --text-body: #B0B0C0;
      --text-muted: #6B6B80;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 24px rgba(123, 47, 190, 0.15);
      --shadow-glow: 0 0 20px rgba(123, 47, 190, 0.6);
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 导航双行样式 */
    .nav-top-row {
      background: rgba(10, 10, 15, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-bottom-row {
      background: var(--bg-deep);
      border-bottom: 1px solid rgba(26, 26, 36, 0.8);
    }
    .channel-tab {
      border-radius: 20px;
      padding: 0.5rem 1.25rem;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-body);
      transition: var(--transition);
      white-space: nowrap;
    }
    .channel-tab:hover {
      background: rgba(139, 63, 207, 0.2);
      color: white;
    }
    .channel-tab.active {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 12px rgba(123, 47, 190, 0.4);
    }
    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, #7B2FBE, #5A1F9E);
      color: white;
      border-radius: 8px;
      padding: 0.75rem 2rem;
      font-weight: 600;
      border: none;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(123, 47, 190, 0.3);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #8B3FCF, #6A28B0);
      box-shadow: var(--shadow-glow);
      transform: translateY(-1px);
    }
    .btn-outline-accent {
      background: transparent;
      border: 1.5px solid var(--accent);
      color: var(--accent);
      border-radius: 8px;
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline-accent:hover {
      background: var(--accent);
      color: #0A0A0F;
      box-shadow: 0 0 18px rgba(0, 240, 181, 0.5);
    }
    .btn-cta {
      background: var(--accent);
      color: #0A0A0F;
      font-weight: 700;
      border-radius: 8px;
      padding: 0.9rem 2.5rem;
      border: none;
      transition: var(--transition);
      font-size: 1.1rem;
      box-shadow: 0 4px 16px rgba(0, 240, 181, 0.25);
    }
    .btn-cta:hover {
      background: #00e6a6;
      box-shadow: 0 0 28px rgba(0, 240, 181, 0.7);
      transform: scale(1.02);
    }
    /* 卡片样式 */
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .card:hover {
      border-color: var(--accent);
      box-shadow: 0 8px 30px rgba(0, 240, 181, 0.15);
      transform: translateY(-4px);
    }
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-color);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      background: transparent;
      border: none;
      color: white;
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1.5rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      color: var(--text-body);
      line-height: 1.7;
    }
    .faq-item.open .faq-answer {
      max-height: 300px;
      padding-bottom: 1.5rem;
      border-left: 2px solid var(--accent);
      padding-left: 1.2rem;
    }
    .faq-icon {
      font-size: 1.4rem;
      transition: transform 0.3s;
      color: var(--accent);
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    /* 横向滚动隐藏条 */
    .scroll-hide {
      scrollbar-width: none;
      -ms-overflow-style: none;
    }
    .scroll-hide::-webkit-scrollbar {
      display: none;
    }
    /* 玻璃标签 */
    .glass-tag {
      background: rgba(19, 19, 26, 0.7);
      backdrop-filter: blur(8px);
      border-radius: 30px;
      padding: 0.3rem 1rem;
      font-size: 0.85rem;
      color: white;
      border: 1px solid rgba(255,255,255,0.1);
    }
    /* hero overlay */
    .hero-overlay {
      background: linear-gradient(90deg, rgba(10,10,15,0.9) 0%, rgba(10,10,15,0.5) 60%, rgba(10,10,15,0.2) 100%);
    }
    @media (max-width: 768px) {
      .hero-overlay {
        background: rgba(10,10,15,0.75);
      }
    }
    .accent-line {
      width: 60px;
      height: 4px;
      background: var(--accent);
      border-radius: 2px;
    }