/* roulang page: index */
:root {
      --primary-deep-green: #0B2B1F;
      --accent-orange: #E85D04;
      --accent-orange-hover: #C44800;
      --warm-bg: #F4F0E6;
      --white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-gray: #5C5C5C;
      --border-light: #D9D4CC;
      --card-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
      --card-hover-shadow: 0 16px 36px rgba(0, 0, 0, 0.08);
      --radius-card: 16px;
      --radius-btn: 10px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "Segoe UI", "Helvetica Neue", sans-serif;
      --transition-smooth: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      background: var(--white);
      height: 72px;
      border-bottom: 1px solid var(--border-light);
      z-index: 50;
      display: flex;
      align-items: center;
      backdrop-filter: blur(8px);
      background: rgba(255,255,255,0.92);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 1.7rem;
      color: var(--primary-deep-green);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.3px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--accent-orange);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background: var(--accent-orange);
      transition: transform 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--accent-orange);
    }
    .nav-links a:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.5rem;
      font-weight: 600;
      font-size: 0.95rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
      box-shadow: 0 4px 10px rgba(232,93,4,0.2);
    }
    .btn-primary:hover {
      background: var(--accent-orange-hover);
      box-shadow: 0 8px 18px rgba(232,93,4,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep-green);
      color: var(--primary-deep-green);
      border-radius: var(--radius-btn);
      padding: 0.55rem 1.5rem;
      font-weight: 600;
      font-size: 0.95rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition-smooth);
    }
    .btn-outline:hover {
      background: rgba(11,43,31,0.06);
      border-color: var(--accent-orange);
      color: var(--accent-orange);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep-green);
    }
    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 2rem;
      gap: 2rem;
      box-shadow: 0 20px 30px rgba(0,0,0,0.1);
      z-index: 40;
    }
    .mobile-menu.active {
      display: flex;
    }
    /* 区块间距 */
    section {
      padding: 5rem 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 3.5rem 0;
      }
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .navbar { height: 68px; }
    }
    /* 卡片通用 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition-smooth);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
    }
    /* 高亮数字 */
    .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.1;
      color: var(--accent-orange);
    }
    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: 14px;
      padding: 1.2rem 1.6rem;
      margin-bottom: 1rem;
      border: 1px solid var(--border-light);
      transition: var(--transition-smooth);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      color: var(--text-dark);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-gray);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 1rem;
    }
    .faq-item.active {
      background: #f0f7f2;
      border-color: var(--primary-deep-green);
    }
    /* 对比卡片 */
    .compare-card {
      border-radius: 20px;
      padding: 2rem;
      background: white;
    }
    .compare-card.pro {
      background: #eef7f1;
      border: 2px solid var(--primary-deep-green);
    }
    .highlight-badge {
      background: var(--accent-orange);
      color: white;
      font-size: 0.8rem;
      padding: 0.25rem 1rem;
      border-radius: 20px;
    }