/* roulang page: index */
:root {
      --primary-deepgreen: #0B2B1F;
      --accent-orange: #F5A623;
      --bg-warm: #F9FAF7;
      --text-dark: #1A1A1A;
      --text-muted: #5A5A5A;
      --white: #FFFFFF;
      --border-light: rgba(0,0,0,0.06);
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-sm: 8px;
      --radius-btn: 6px;
      --radius-img: 12px;
      --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --max-width: 1280px;
      --section-gap: 5rem;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all 0.2s ease;
      cursor: pointer;
      border: none;
      font-size: 1rem;
      padding: 0.75rem 2rem;
      letter-spacing: 0.02em;
    }

    .btn-primary {
      background: var(--accent-orange);
      color: var(--primary-deepgreen);
      box-shadow: 0 4px 10px rgba(245,166,35,0.25);
    }

    .btn-primary:hover {
      background: #E09515;
      transform: scale(1.02);
      box-shadow: 0 8px 18px rgba(245,166,35,0.35);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deepgreen);
      color: var(--primary-deepgreen);
    }

    .btn-outline:hover {
      background: rgba(11,43,31,0.05);
      border-color: #0B2B1F;
    }

    /* 导航 PC */
    .nav-desktop {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(11, 43, 31, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
      letter-spacing: -0.3px;
    }

    .logo span {
      color: var(--accent-orange);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
    }

    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--accent-orange);
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: var(--white);
      box-shadow: 0 -2px 12px rgba(0,0,0,0.06);
      justify-content: space-around;
      padding: 10px 8px;
      z-index: 55;
      border-top: 1px solid var(--border-light);
    }

    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: var(--text-muted);
      transition: color 0.2s;
      gap: 2px;
      font-weight: 500;
    }

    .mobile-nav-item i {
      font-size: 1.3rem;
    }

    .mobile-nav-item.active {
      color: var(--accent-orange);
      font-weight: 700;
    }

    /* Hero */
    .hero {
      padding: 3rem 0 4rem;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary-deepgreen);
      margin-bottom: 1.25rem;
    }

    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-muted);
      margin-bottom: 2rem;
    }

    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .hero-image img {
      border-radius: var(--radius-img);
      box-shadow: 0 20px 35px rgba(0,0,0,0.15), inset 0 0 0 2px rgba(255,255,255,0.6);
      width: 100%;
      aspect-ratio: 4/3;
      object-fit: cover;
    }

    /* 板块通用 */
    .section {
      margin: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 600;
      color: var(--primary-deepgreen);
      margin-bottom: 2.5rem;
      text-align: center;
    }

    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }

    .feature-card {
      background: var(--white);
      padding: 2rem 1.5rem;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: all 0.25s;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .feature-icon {
      font-size: 2.5rem;
      color: var(--accent-orange);
      margin-bottom: 1.2rem;
    }

    .feature-card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }

    /* 瀑布流卡片 */
    .masonry-grid {
      columns: 2;
      column-gap: 1.5rem;
    }

    .service-card {
      break-inside: avoid;
      background: var(--white);
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      margin-bottom: 1.5rem;
      transition: 0.2s;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .service-img {
      height: 180px;
      object-fit: cover;
      transition: transform 0.3s;
    }

    .service-card:hover .service-img {
      transform: scale(1.03);
    }

    .service-body {
      padding: 1.25rem;
    }

    .tag {
      background: var(--accent-orange);
      color: #0B2B1F;
      font-weight: 600;
      font-size: 0.75rem;
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 0.5rem;
    }

    /* 对比表 */
    .compare-panel {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      background: var(--white);
      border-radius: var(--radius-sm);
      padding: 2rem;
      box-shadow: var(--shadow-card);
    }

    .compare-col {
      padding: 1rem;
    }

    .compare-col.highlight {
      border: 2px solid var(--accent-orange);
      border-radius: var(--radius-sm);
      background: #FFF9F0;
    }

    .compare-item {
      display: flex;
      align-items: center;
      gap: 0.8rem;
      margin: 1rem 0;
    }

    .green-check { color: #0B2B1F; font-weight: bold; }
    .red-cross { color: #C0392B; }

    /* 数据横条 */
    .stats-bar {
      background: var(--primary-deepgreen);
      color: white;
      border-radius: var(--radius-sm);
      padding: 2rem;
      display: flex;
      justify-content: space-around;
      text-align: center;
    }

    .stat-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-orange);
    }

    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-sm);
      margin-bottom: 0.8rem;
      box-shadow: var(--shadow-card);
    }

    .faq-question {
      padding: 1.2rem 1.5rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: #F4F7F2;
    }

    .faq-answer {
      padding: 0 1.5rem 1.2rem;
      display: none;
      color: var(--text-muted);
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA 横幅 */
    .cta-band {
      background: var(--accent-orange);
      border-radius: var(--radius-sm);
      padding: 3rem;
      text-align: center;
      color: #0B2B1F;
    }

    .footer {
      background: var(--primary-deepgreen);
      color: rgba(255,255,255,0.9);
      padding: 3rem 0 1.5rem;
      margin-top: 3rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 2rem;
    }

    @media (max-width: 768px) {
      .container { padding: 0 16px; }
      .nav-desktop { display: none; }
      .mobile-nav { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .features-grid { grid-template-columns: 1fr; }
      .masonry-grid { columns: 1; }
      .compare-panel { grid-template-columns: 1fr; }
      .stats-bar { flex-direction: column; gap: 1.5rem; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-content h1 { font-size: 2.2rem; }
      body { padding-bottom: 70px; }
    }