/* roulang page: index */
:root {
      --primary: #0A4B3A;
      --primary-light: #E8F5E9;
      --accent: #FF6F00;
      --accent-hover: #E65100;
      --text-main: #1A1A1A;
      --text-sub: #5A5A5A;
      --bg-light: #F7F9F8;
      --white: #FFFFFF;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.06);
      --card-shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --border-radius: 12px;
      --btn-radius: 8px;
      --transition: all 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --max-width: 1200px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .btn {
      display: inline-block;
      padding: 14px 32px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      text-align: center;
      transition: var(--transition);
      cursor: pointer;
      border: none;
      font-size: 1rem;
    }
    .btn-primary {
      background-color: var(--accent);
      color: white;
      box-shadow: 0 4px 12px rgba(255,111,0,0.25);
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(255,111,0,0.35);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-secondary:hover {
      background-color: var(--primary-light);
      border-color: var(--primary);
    }
    .btn-white {
      background: white;
      color: var(--primary);
      border: 2px solid white;
    }
    .btn-white:hover {
      background: transparent;
      color: white;
      border-color: white;
    }
    .section {
      padding: 90px 0;
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 1.125rem;
      color: var(--text-sub);
      max-width: 700px;
      margin: 0 auto 48px auto;
    }
    .card {
      background: var(--white);
      border-radius: var(--border-radius);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      overflow: hidden;
    }
    .card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      padding: 16px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 2rem;
      color: var(--accent);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: var(--transition);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
    }
    /* 手机菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      padding: 24px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      gap: 16px;
    }
    .mobile-menu a {
      font-size: 1.2rem;
      font-weight: 500;
      padding: 8px 0;
      border-bottom: 1px solid #eee;
    }
    /* Hero */
    .hero {
      min-height: 90vh;
      background: linear-gradient(rgba(10,75,58,0.82), rgba(10,75,58,0.9)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    .hero-content {
      max-width: 720px;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.15;
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 1.25rem;
      opacity: 0.92;
      margin-bottom: 32px;
    }
    .hero-badge {
      display: inline-block;
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(4px);
      padding: 8px 20px;
      border-radius: 30px;
      font-size: 0.95rem;
      margin-bottom: 24px;
    }
    /* 价值卡片 */
    .value-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
    }
    .value-card {
      text-align: center;
      padding: 32px 20px;
    }
    .value-icon {
      font-size: 2.5rem;
      color: var(--accent);
      margin-bottom: 20px;
    }
    /* 功能分组 */
    .module-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .module-row.reverse {
      flex-direction: row-reverse;
    }
    .module-text {
      flex: 1;
    }
    .module-image {
      flex: 1;
      background: var(--primary-light);
      border-radius: var(--border-radius);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    .module-image img {
      width: 100%;
      height: auto;
      aspect-ratio: 16/9;
      object-fit: cover;
    }
    /* 场景 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }
    .scenario-card {
      position: relative;
      border-radius: var(--border-radius);
      overflow: hidden;
      height: 280px;
    }
    .scenario-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .scenario-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(10,75,58,0.8));
      color: white;
      padding: 24px;
      font-weight: 600;
      font-size: 1.4rem;
    }
    /* 案例 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .case-card {
      min-width: 280px;
      background: var(--primary-light);
      border-radius: var(--border-radius);
      padding: 24px;
    }
    .case-logo {
      width: 60px;
      height: 60px;
      background: #ccc;
      border-radius: 50%;
      margin-bottom: 16px;
    }
    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .pricing-card {
      text-align: center;
      padding: 40px 24px;
    }
    .pricing-card.featured {
      border: 2px solid var(--accent);
      transform: scale(1.03);
      position: relative;
    }
    .popular-tag {
      background: var(--accent);
      color: white;
      font-size: 0.8rem;
      padding: 4px 14px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #ddd;
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.125rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-sub);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA */
    .cta-banner {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    /* 页脚 */
    .footer {
      background: #0A3B2E;
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
    }
    @media (max-width: 1024px) {
      .value-grid { grid-template-columns: repeat(2,1fr); }
      .pricing-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .mobile-menu.active { display: flex; }
      .hero h1 { font-size: 2.4rem; }
      .module-row, .module-row.reverse { flex-direction: column; }
      .scenario-grid { grid-template-columns: 1fr; }
      .value-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .section { padding: 60px 0; }
    }