/* roulang page: index */
:root {
      --primary-purple: #7B2FF7;
      --primary-cyan: #00F0FF;
      --deep-black: #0A0E1A;
      --card-bg: #F2F4F8;
      --accent-orange: #FF5E13;
      --text-main: #1F2937;
      --text-muted: #6B7280;
      --white: #FFFFFF;
      --gradient-main: linear-gradient(135deg, #7B2FF7 0%, #00F0FF 100%);
      --shadow-card: 0 12px 30px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 20px 35px rgba(0, 0, 0, 0.1);
      --radius-xl: 20px;
      --radius-full: 50px;
      --transition-smooth: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 吸顶导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
    }
    .header-scrolled {
      background: rgba(10, 14, 26, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 10px 25px -10px rgba(0,0,0,0.3);
    }
    .brand-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 52px;
      padding: 0 1.5rem;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.4rem;
      letter-spacing: 0.5px;
      background: var(--gradient-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: inline-block;
    }
    .search-entry {
      display: flex;
      align-items: center;
      gap: 1.5rem;
      color: #ccc;
      font-size: 0.9rem;
      cursor: default;
    }
    .channel-nav {
      display: flex;
      align-items: center;
      gap: 2rem;
      padding: 0 1.5rem;
      height: 44px;
      font-size: 0.95rem;
      font-weight: 500;
      color: #d1d5db;
    }
    .channel-nav a {
      color: #d1d5db;
      text-decoration: none;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }
    .channel-nav a:hover {
      color: #00F0FF;
    }
    .channel-nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: #00F0FF;
      transition: width 0.25s;
    }
    .channel-nav a:hover::after {
      width: 100%;
    }

    /* 移动端汉堡菜单 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 1.6rem;
      cursor: pointer;
    }
    .mobile-nav {
      display: none;
      flex-direction: column;
      background: rgba(10,14,26,0.96);
      backdrop-filter: blur(20px);
      padding: 1rem 1.5rem;
      gap: 1rem;
    }
    .mobile-nav a {
      color: #e5e7eb;
      text-decoration: none;
      font-weight: 500;
    }

    /* 通用板块 */
    .section {
      padding-top: 80px;
      padding-bottom: 80px;
    }
    @media (max-width: 768px) {
      .section {
        padding-top: 60px;
        padding-bottom: 60px;
      }
    }

    .btn-primary {
      background: var(--gradient-main);
      border: none;
      color: white;
      font-weight: 600;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-full);
      cursor: pointer;
      transition: 0.25s ease;
      display: inline-block;
      text-decoration: none;
      box-shadow: 0 8px 18px rgba(123,47,247,0.3);
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      transform: scale(1.03);
      box-shadow: 0 12px 24px rgba(0,240,255,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid #00F0FF;
      color: #00F0FF;
      font-weight: 600;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-full);
      cursor: pointer;
      transition: 0.25s;
      text-decoration: none;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.12);
      border-color: #7B2FF7;
      color: white;
    }

    .badge-data {
      background: rgba(0,240,255,0.12);
      color: #00F0FF;
      font-weight: 700;
      padding: 0.3rem 1rem;
      border-radius: 30px;
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
    }

    .card-hover {
      transition: transform 0.3s, box-shadow 0.3s;
      border-radius: var(--radius-xl);
      background: var(--card-bg);
      box-shadow: var(--shadow-card);
    }
    .card-hover:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .faq-panel {
      border: 1px solid #e5e7eb;
      border-radius: 16px;
      background: white;
      transition: border 0.2s;
    }
    .faq-panel[open] {
      border-color: #00F0FF;
    }