/* roulang page: index */
/* 自定义CSS变量与全局重置 */
    :root {
      --primary: #FF6B35;
      --primary-dark: #E0552A;
      --secondary: #1A1A1A;
      --bg: #F5F3EF;
      --card-white: #FFFFFF;
      --text-dark: #2D2D2D;
      --text-muted: #6B6B6B;
      --success: #2E8B57;
      --gradient-brand: linear-gradient(135deg, #FF6B35 0%, #E0552A 100%);
      --gradient-dark: linear-gradient(135deg, #1A1A1A 0%, #2D2D2D 100%);
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 12px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "PingFang SC", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input {
      font-family: inherit;
    }

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

    /* 导航系统 - 移动优先胶囊导航 */
    .nav-blur {
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }

    .nav-capsule {
      transition: all 0.3s ease;
      border-radius: 40px;
      padding: 0.6rem 1.25rem;
      font-weight: 500;
      color: var(--secondary);
      background: transparent;
    }

    .nav-capsule:hover {
      background: var(--gradient-brand);
      color: white;
    }

    .active-indicator {
      background: var(--gradient-brand);
      color: white;
    }

    /* 移动端底部导航与遮罩 */
    .mobile-bottom-nav {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid rgba(0,0,0,0.05);
    }

    .fullscreen-overlay {
      background: var(--gradient-dark);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--gradient-brand);
      color: white;
      border-radius: var(--radius-md);
      padding: 0.875rem 2rem;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      transform: scale(1.05);
      box-shadow: 0 10px 25px rgba(255,107,53,0.4);
    }
    .btn-primary:active {
      transform: scale(0.98);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-md);
      padding: 0.875rem 2rem;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-block;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: var(--gradient-brand);
      color: white;
      border-color: transparent;
      transform: scale(1.05);
    }

    .btn-submit {
      background: #FF6B35;
      color: white;
      border-radius: var(--radius-md);
      padding: 0.875rem 2rem;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-submit:hover {
      filter: brightness(1.1);
    }

    /* 卡片与动效 */
    .card-hover {
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      border-radius: var(--radius-xl);
      background: var(--card-white);
      box-shadow: var(--shadow-card);
    }
    .card-hover:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }

    .data-badge {
      background: rgba(255,255,255,0.2);
      backdrop-filter: blur(4px);
      -webkit-backdrop-filter: blur(4px);
      border-radius: 16px;
      padding: 0.8rem 1.2rem;
    }

    .gradient-text {
      background: var(--gradient-brand);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      color: var(--secondary);
      margin-bottom: 0.75rem;
      text-align: center;
    }
    .title-underline {
      width: 60px;
      height: 6px;
      background: var(--gradient-brand);
      margin: 0 auto 3rem auto;
      border-radius: 3px;
    }

    .faq-item {
      background: var(--card-white);
      border-radius: var(--radius-lg);
      padding: 1.2rem 1.8rem;
      margin-bottom: 1rem;
      cursor: pointer;
      transition: background 0.2s;
    }
    .faq-item.active {
      background: #f0efeb;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }

    /* 数据徽章计数动画 */
    .count-up {
      font-family: var(--font-number);
      font-weight: 700;
      font-style: italic;
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 1.75rem;
      }
      .container {
        padding-left: 1rem;
        padding-right: 1rem;
      }
    }