/* roulang page: index */
/* 自定义设计变量与全局重置，完全覆盖默认视觉 */
    :root {
      --primary: #E94E1B;
      --primary-soft: rgba(233, 78, 27, 0.1);
      --accent-gold: #F5A623;
      --dark-deep: #1A1A2E;
      --text-body: #4A4A5A;
      --text-muted: #8C8C9A;
      --bg-page: #F9F9FB;
      --card-bg: #FFFFFF;
      --border-light: rgba(26, 26, 46, 0.06);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-tag: 20px;
      --shadow-hover: 0 12px 28px rgba(233, 78, 27, 0.12);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      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;
      transition: color 0.2s ease;
    }

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

    /* 导航系统 - 白底平台导航，sticky */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: border-color 0.3s, box-shadow 0.3s;
    }
    .navbar.scrolled {
      border-bottom-color: rgba(0,0,0,0.04);
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo-text {
      font-size: 1.75rem;
      font-weight: 700;
      color: var(--dark-deep);
      letter-spacing: -0.5px;
    }
    .logo-text span {
      color: var(--primary);
    }
    .logo-domain {
      font-size: 0.7rem;
      color: var(--text-muted);
      display: block;
      line-height: 1;
      margin-top: 2px;
      font-weight: 400;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 0.25rem 0;
      transition: color 0.2s;
    }
    .nav-link:hover,
    .nav-link.active {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }

    .btn-outline-primary {
      border: 1px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 0.55rem 1.5rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
      display: inline-block;
      cursor: pointer;
    }
    .btn-outline-primary:hover {
      background: var(--primary-soft);
      transform: scale(1.02);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--accent-gold));
      color: white;
      border: none;
      padding: 0.65rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 8px 18px rgba(233,78,27,0.25);
      transition: all 0.25s;
      display: inline-block;
      cursor: pointer;
      border: 1px solid transparent;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
      box-shadow: 0 12px 24px rgba(233,78,27,0.35);
    }

    /* 移动端菜单按钮 */
    .menu-toggle {
      display: none;
      font-size: 1.8rem;
      color: var(--dark-deep);
      background: none;
      border: none;
      cursor: pointer;
    }

    /* 区块间距 */
    section {
      padding: 5rem 0;
    }

    /* 卡片通用 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      transition: all 0.3s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }

    /* 数据徽章 */
    .badge-stat {
      background: rgba(245,166,35,0.08);
      border-radius: var(--radius-card);
      padding: 1rem 1.8rem;
      text-align: center;
    }
    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-gold);
      line-height: 1.2;
    }

    /* Hero 背景装饰 */
    .hero-bg-img {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      border-radius: 24px;
      overflow: hidden;
    }
    .hero-bg-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,26,46,0.8) 0%, rgba(233,78,27,0.3) 100%);
    }

    /* 对比表高亮右侧 */
    .compare-highlight {
      background: rgba(233,78,27,0.03);
      border-left: 4px solid var(--primary);
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      padding: 1.25rem 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--dark-deep);
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.2s;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.25rem;
    }
    .faq-item.active .faq-question {
      color: var(--primary);
    }

    /* 页脚深色背景 */
    .footer-dark {
      background: var(--dark-deep);
      color: #CCCCD6;
    }

    @media (max-width: 1023px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 2rem;
        box-shadow: 0 20px 30px rgba(0,0,0,0.05);
        gap: 1.5rem;
      }
      .nav-links.open {
        display: flex;
      }
    }

    @media (max-width: 767px) {
      section {
        padding: 3.5rem 0;
      }
      h1 {
        font-size: 2rem !important;
        line-height: 1.3 !important;
      }
      h2 {
        font-size: 1.8rem !important;
      }
    }