/* roulang page: index */
:root {
      --deep-green: #0B5E3C;
      --electric-cyan: #00C9A7;
      --bg-warm: #F7F9F8;
      --card-white: #FFFFFF;
      --dark-moss: #0A2520;
      --amber-accent: #F59E0B;
      --text-primary: #0A2520;
      --text-secondary: #3A4F48;
      --text-muted: #5F736A;
      --shadow-sm: 0 2px 8px rgba(10,37,32,0.06);
      --shadow-lg: 0 12px 28px rgba(11,94,60,0.12);
      --radius-card: 20px;
      --radius-mid: 12px;
      --radius-pill: 40px;
      --radius-badge: 8px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }
    @media (max-width: 768px) {
      .container-custom {
        padding: 0 1.5rem;
      }
    }
    /* 导航 */
    .nav-blur {
      backdrop-filter: blur(8px);
      background-color: rgba(255,255,255,0.85);
      transition: all 0.3s ease;
    }
    .nav-scrolled {
      background-color: rgba(255,255,255,0.98);
      box-shadow: 0 4px 16px rgba(0,0,0,0.04);
    }
    .nav-link {
      color: var(--text-secondary);
      font-weight: 500;
      position: relative;
      padding: 0.25rem 0;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--deep-green);
    }
    .nav-link.active {
      color: var(--deep-green);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--electric-cyan);
      border-radius: 2px;
    }
    .hamburger-line {
      background-color: var(--electric-cyan);
      height: 2px;
      width: 24px;
      margin: 5px 0;
      transition: 0.3s;
    }
    /* 按钮 */
    .btn-primary {
      background-color: var(--deep-green);
      color: white;
      border-radius: var(--radius-pill);
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(11,94,60,0.25);
    }
    .btn-primary:hover {
      background-color: #0D7048;
      box-shadow: 0 6px 14px rgba(11,94,60,0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--electric-cyan);
      color: var(--electric-cyan);
      border-radius: var(--radius-pill);
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }
    .btn-outline:hover {
      background-color: rgba(0,201,167,0.08);
      border-color: #00b392;
      color: #00b392;
    }
    .btn-cta {
      background-color: var(--amber-accent);
      color: var(--dark-moss);
      border-radius: var(--radius-pill);
      padding: 0.8rem 2.2rem;
      font-weight: 700;
      transition: all 0.25s;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(245,158,11,0.3);
    }
    .btn-cta:hover {
      background-color: #FBBF24;
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(245,158,11,0.4);
    }
    /* 数据徽章 */
    .badge-metric {
      background-color: rgba(11,94,60,0.1);
      color: var(--deep-green);
      border-radius: var(--radius-badge);
      padding: 0.3rem 0.9rem;
      font-weight: 600;
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .number-highlight {
      color: var(--amber-accent);
      font-weight: 800;
    }
    /* 卡片效果 */
    .card-service {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.2,0.9,0.4,1);
      border: 1px solid rgba(0,0,0,0.02);
    }
    .card-service:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }
    .icon-circle {
      background-color: rgba(0,201,167,0.12);
      border-radius: 12px;
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--electric-cyan);
      font-size: 1.5rem;
    }
    /* 对比面板 */
    .compare-bad {
      background-color: #f2f5f4;
      border-left: 4px solid #cbd5d1;
    }
    .compare-good {
      background-color: #f0faf5;
      border-left: 4px solid var(--deep-green);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(10,37,32,0.08);
    }
    .faq-question {
      cursor: pointer;
      padding: 1.2rem 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-primary);
      transition: background 0.2s;
    }
    .faq-question:hover {
      background-color: rgba(11,94,60,0.03);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      background-color: rgba(11,94,60,0.02);
      border-radius: 0 0 12px 12px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 1rem 1.5rem;
      margin-bottom: 0.5rem;
    }
    .faq-icon {
      color: var(--electric-cyan);
      font-size: 1.3rem;
      transition: transform 0.3s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 表单 */
    .input-field {
      background: white;
      border-radius: var(--radius-mid);
      padding: 0.9rem 1.2rem;
      border: 1px solid #dce5e1;
      width: 100%;
      transition: border 0.2s;
      color: var(--text-primary);
    }
    .input-field:focus {
      outline: none;
      border-color: var(--electric-cyan);
      box-shadow: 0 0 0 3px rgba(0,201,167,0.15);
    }
    /* 动画预留 */
    @keyframes countUp {
      0% { opacity: 0; transform: translateY(10px); }
      100% { opacity: 1; transform: translateY(0); }
    }
    .animate-count {
      animation: countUp 0.6s ease-out forwards;
    }