/* roulang page: index */
:root {
      --deep-space: #0B0E1A;
      --dark-panel: #131829;
      --energy-orange: #FF6B2B;
      --trail-cyan: #00E5CC;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-border: rgba(255, 255, 255, 0.2);
      --glass-hover-bg: rgba(255, 255, 255, 0.06);
      --text-primary: rgba(255, 255, 255, 0.92);
      --text-secondary: rgba(255, 255, 255, 0.65);
      --text-muted: rgba(255, 255, 255, 0.4);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-btn: 10px;
      --shadow-glow: 0 0 20px rgba(0, 229, 204, 0.1);
      --shadow-orange: 0 0 15px rgba(255, 107, 43, 0.4);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', '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 30% 10%, #1a1f2f 0%, var(--deep-space) 70%);
      background-attachment: fixed;
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      position: relative;
    }

    /* 背景网格纹理 (模拟蚂蚁路径/赛场线) */
    body::before {
      content: "";
      position: fixed;
      inset: 0;
      background-image: 
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }

    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
      position: relative;
      z-index: 2;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: inset 0 1px 0 rgba(255,255,255,0.05);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: var(--glass-hover-border);
      background: var(--glass-hover-bg);
      box-shadow: var(--shadow-glow), inset 0 1px 0 rgba(255,255,255,0.08);
      transform: translateY(-4px);
    }
    .glass-card-sm {
      border-radius: var(--radius-md);
    }

    /* 按钮体系 */
    .btn-primary {
      background: var(--energy-orange);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      box-shadow: var(--shadow-orange);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 25px rgba(255, 107, 43, 0.6);
      transform: scale(1.03);
      filter: brightness(1.1);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--trail-cyan);
      color: var(--trail-cyan);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }
    .btn-secondary:hover {
      background: rgba(0, 229, 204, 0.1);
      border-color: rgba(0, 229, 204, 0.8);
      transform: scale(1.02);
    }
    .btn-lg {
      padding: 16px 40px;
      font-size: 1.15rem;
    }

    /* 导航 */
    .navbar {
      backdrop-filter: blur(25px);
      -webkit-backdrop-filter: blur(25px);
      background: rgba(11, 14, 26, 0.8);
      border-bottom: 1px solid rgba(255,255,255,0.05);
      position: sticky;
      top: 0;
      z-index: 50;
      height: 64px;
      display: flex;
      align-items: center;
    }
    .nav-tab {
      color: rgba(255,255,255,0.6);
      font-weight: 500;
      padding: 8px 16px;
      border-radius: 40px;
      transition: all 0.2s;
      text-decoration: none;
      font-size: 0.95rem;
    }
    .nav-tab:hover {
      color: white;
      background: rgba(255,255,255,0.05);
    }
    .nav-tab.active {
      color: white;
      border-bottom: 2px solid var(--trail-cyan);
      background: transparent;
      border-radius: 0;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }

    /* 图标/装饰 */
    .icon-placeholder {
      width: 64px;
      height: 64px;
      background: rgba(0, 229, 204, 0.08);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--trail-cyan);
      font-size: 28px;
      margin-bottom: 20px;
    }

    .data-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--trail-cyan);
      line-height: 1.1;
    }

    /* FAQ */
    .faq-item {
      background: rgba(255,255,255,0.02);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: 10px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: rgba(255,255,255,0.02);
      color: var(--text-secondary);
      padding: 0 24px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }
    .faq-icon {
      color: var(--energy-orange);
      font-weight: bold;
      font-size: 1.3rem;
    }

    /* 响应式 */
    @media (max-width: 1023px) {
      .desktop-nav-tabs {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(11, 14, 26, 0.9);
        backdrop-filter: blur(20px);
        border-top: 1px solid rgba(255,255,255,0.08);
        justify-content: space-around;
        padding: 10px 16px;
        z-index: 55;
        height: 64px;
      }
      .mobile-nav-item {
        color: rgba(255,255,255,0.5);
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 0.7rem;
        text-decoration: none;
      }
      .mobile-nav-item i {
        font-size: 1.4rem;
        margin-bottom: 4px;
      }
      .mobile-nav-item.active {
        color: var(--trail-cyan);
      }
      body {
        padding-bottom: 80px;
      }
    }
    @media (max-width: 767px) {
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
      h1 {
        font-size: 2.5rem !important;
      }
      h2 {
        font-size: 2rem !important;
      }
    }