/* roulang page: index */
:root {
      --primary: #0F6E3F;
      --primary-dark: #0a5530;
      --secondary: #1A1A2E;
      --accent: #F5A623;
      --accent-light: #f7c56c;
      --bg: #F7F9FC;
      --white: #FFFFFF;
      --text: #1A1A2E;
      --text-secondary: #4A4A5A;
      --text-muted: #8C8C9A;
      --border-light: #e9edf2;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-glow: 0 8px 28px rgba(15,110,63,0.3);
      --radius-sm: 12px;
      --radius-md: 20px;
      --radius-lg: 24px;
      --radius-btn: 30px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--text);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      outline: none;
      transition: var(--transition);
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航 */
    .nav-bar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      height: 72px;
      display: flex;
      align-items: center;
      transition: box-shadow 0.3s;
    }
    .nav-bar.scrolled {
      box-shadow: 0 4px 18px rgba(0,0,0,0.06);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.5px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary), #1e8b50);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-size: 0.95rem;
      color: var(--text-secondary);
      font-weight: 500;
      position: relative;
      padding: 6px 0;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a.active {
      color: var(--primary);
      border-bottom: 2px solid var(--primary);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), #1a7a48);
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-size: 0.9rem;
      box-shadow: 0 4px 10px rgba(15,110,63,0.25);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .btn-primary:hover {
      box-shadow: var(--shadow-glow);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      background: transparent;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-size: 0.9rem;
    }
    .btn-outline:hover {
      background: rgba(15,110,63,0.08);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 2px;
      transition: 0.2s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      align-items: center;
      gap: 24px;
      padding: 32px;
      box-shadow: 0 12px 24px rgba(0,0,0,0.05);
      opacity: 0;
      transform: translateY(-10px);
      transition: 0.25s;
      z-index: 45;
    }
    .mobile-menu.open {
      display: flex;
      opacity: 1;
      transform: translateY(0);
    }
    .mobile-menu a {
      font-size: 1.3rem;
      font-weight: 600;
      color: var(--text);
    }
    /* Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(180deg, #f0f6f3 0%, var(--bg) 100%);
      padding: 48px 0;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 45%;
    }
    .hero-image {
      flex: 1 1 45%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      min-height: 380px;
      box-shadow: var(--shadow-md);
      position: relative;
    }
    .hero-badge-group {
      display: flex;
      gap: 16px;
      margin-top: 32px;
      flex-wrap: wrap;
    }
    .badge-card {
      background: white;
      border-radius: 16px;
      padding: 12px 20px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 600;
    }
    .badge-card span {
      color: var(--primary);
      font-size: 1.8rem;
      font-weight: 700;
    }
    h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--secondary);
    }
    .subtitle {
      font-size: 1.25rem;
      color: var(--text-secondary);
      margin: 20px 0 28px;
    }
    /* sections */
    section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--secondary);
    }
    .section-desc {
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .pain-card {
      background: #f4f8f6;
      border-radius: 16px;
      padding: 24px;
    }
    .solution-card {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .icon-circle {
      width: 52px;
      height: 52px;
      background: rgba(15,110,63,0.1);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
    }
    .data-badge {
      background: linear-gradient(135deg, var(--primary), #1e7a48);
      color: white;
      border-radius: 24px;
      padding: 28px 16px;
      text-align: center;
    }
    .data-badge .number {
      font-size: 2.8rem;
      font-weight: 700;
      font-family: 'Inter', sans-serif;
    }
    .testimonial-card {
      background: white;
      border-radius: 16px;
      padding: 24px;
      border-left: 5px solid var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .faq-item {
      border: 1px solid var(--border-light);
      border-radius: 14px;
      margin-bottom: 14px;
      background: white;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: none;
      width: 100%;
      text-align: left;
      color: var(--text);
    }
    .faq-answer {
      padding: 0 24px 24px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question {
      color: var(--primary);
    }
    .cta-section {
      background: linear-gradient(135deg, #0a3d25, #0F6E3F);
      color: white;
      border-radius: 32px;
      padding: 64px 32px;
      text-align: center;
    }
    .footer {
      background: var(--secondary);
      color: #cfd3db;
      padding: 60px 0 30px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    @media (max-width: 1024px) {
      .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
      h1 { font-size: 2.2rem; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid { flex-direction: column; }
      .hero-image { min-height: 280px; width: 100%; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      section { padding: 64px 0; }
      .cta-section { padding: 40px 20px; }
    }