/* roulang page: index */
:root {
      --primary: #0A3D2E;
      --primary-hover: #073528;
      --accent: #E8B830;
      --accent-foreground: #1C1C1C;
      --bg: #F7F5F0;
      --surface: #FFFFFF;
      --dark: #0F2922;
      --text: #1C1C1C;
      --text-secondary: #5A5A5A;
      --border: #E0DDD5;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-sm: 0 2px 12px rgba(10, 61, 46, 0.06);
      --shadow-md: 0 8px 24px rgba(10, 61, 46, 0.12);
      --font-serif: "Noto Serif SC", "Source Han Serif SC", serif;
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-number: "Inter", "Roboto", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.75;
      color: var(--text);
      background-color: var(--bg);
      -webkit-font-smoothing: antialiased;
      padding-bottom: env(safe-area-inset-bottom, 0px);
    }

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

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

    button, .btn, [role="button"] {
      cursor: pointer;
      font-family: inherit;
      min-height: 44px;
      min-width: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 200ms ease;
      border: none;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航桌面 */
    .desktop-nav {
      display: none;
    }

    .mobile-bottom-tab {
      display: flex;
    }

    @media (min-width: 1024px) {
      .desktop-nav {
        display: flex;
        position: sticky;
        top: 0;
        z-index: 40;
        background: rgba(255, 255, 255, 0.92);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border);
        box-shadow: 0 1px 6px rgba(0,0,0,0.02);
        align-items: center;
        justify-content: space-between;
        padding: 0 32px;
        height: 72px;
      }
      .mobile-bottom-tab {
        display: none;
      }
    }

    .nav-link {
      position: relative;
      font-weight: 500;
      color: var(--text);
      padding: 8px 4px;
      transition: color 200ms;
    }
    .nav-link::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 250ms ease;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      font-weight: 600;
      padding: 12px 28px;
      box-shadow: 0 2px 8px rgba(10,61,46,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      font-weight: 600;
      padding: 12px 28px;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }

    .btn-accent {
      background: var(--accent);
      color: var(--accent-foreground);
      border-radius: var(--radius-btn);
      font-weight: 700;
      padding: 14px 36px;
      font-size: 18px;
      box-shadow: 0 4px 12px rgba(232,184,48,0.3);
      transition: all 200ms ease;
    }
    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(232,184,48,0.4);
    }

    .card {
      background: var(--surface);
      border-radius: var(--radius-card);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: all 250ms;
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .section-space {
      padding-top: 100px;
      padding-bottom: 100px;
    }
    @media (max-width: 1023px) {
      .section-space {
        padding-top: 64px;
        padding-bottom: 64px;
      }
    }
    @media (max-width: 767px) {
      .section-space {
        padding-top: 48px;
        padding-bottom: 48px;
      }
    }

    h1, h2, h3 {
      font-family: var(--font-serif);
      font-weight: 700;
    }
    h1 { font-size: 40px; line-height: 1.2; }
    h2 { font-size: 32px; line-height: 1.3; }
    h3 { font-size: 20px; line-height: 1.4; font-weight: 600; }

    @media (max-width: 767px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      h3 { font-size: 18px; }
    }

    .text-accent { color: var(--accent); }
    .bg-primary-light { background-color: #E8F0ED; }

    .faq-item {
      border-bottom: 1px solid var(--border);
    }
    .faq-question {
      font-weight: 600;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s;
      color: var(--text-secondary);
      padding-left: 16px;
      border-left: 4px solid transparent;
    }
    .faq-item.open .faq-answer {
      max-height: 300px;
      padding-top: 8px;
      padding-bottom: 20px;
      border-left-color: var(--primary);
    }
    .faq-icon {
      font-size: 24px;
      color: var(--accent);
      transition: transform 0.25s;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      text-align: center;
    }
    .highlight-col {
      background-color: #E8F0ED;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }

    @media (max-width: 767px) {
      .comparison-scroll {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 8px;
      }
    }