/* roulang page: index */
:root {
      --primary: #1A3C34;
      --primary-dark: #0F2923;
      --accent: #D4A84B;
      --bg-page: #FAFBF8;
      --bg-card: #FFFFFF;
      --bg-soft: #F0F2EC;
      --bg-faq: #F5F6F1;
      --text-main: #1E2D28;
      --text-secondary: #5A6A64;
      --text-muted: #7A8A84;
      --border-light: #E8ECE4;
      --shadow-card: 0 2px 12px rgba(26,60,52,0.04);
      --shadow-hover: 0 8px 28px rgba(26,60,52,0.10);
      --radius-md: 12px;
      --radius-btn: 8px;
      --radius-pill: 40px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, -apple-system, sans-serif;
      --transition-smooth: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-page);
      color: var(--text-main);
      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;
      transition: color 0.2s;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(250, 251, 248, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      transition: var(--transition-smooth);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 0;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .nav-center {
      display: flex;
      align-items: center;
      gap: 32px;
      margin-left: 48px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 4px 0;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      bottom: 0;
      left: 0;
      background: var(--accent);
      transition: width 0.2s ease;
    }
    .nav-link:hover {
      color: var(--accent);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .nav-right {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-box {
      display: flex;
      align-items: center;
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-pill);
      padding: 8px 16px;
      gap: 8px;
      color: var(--text-muted);
      font-size: 14px;
      cursor: default;
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
    }
    .search-box i {
      font-size: 14px;
      opacity: 0.7;
    }
    .search-placeholder {
      color: #9AAA9F;
      user-select: none;
    }
    .btn-login {
      background: transparent;
      border: 1px solid var(--border-light);
      color: var(--primary);
      padding: 8px 16px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      font-size: 14px;
      transition: var(--transition-smooth);
      white-space: nowrap;
    }
    .btn-login:hover {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      transition: var(--transition-smooth);
      cursor: pointer;
      white-space: nowrap;
      box-shadow: 0 2px 8px rgba(212,168,75,0.3);
    }
    .btn-primary:hover {
      background: #c99b3a;
      box-shadow: 0 4px 14px rgba(212,168,75,0.4);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      transition: var(--transition-smooth);
      cursor: pointer;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
      cursor: pointer;
    }
    /* 汉堡全屏菜单 */
    .mobile-overlay {
      display: none;
      position: fixed;
      inset: 0;
      background: rgba(15,30,26,0.97);
      z-index: 2000;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
    }
    .mobile-overlay.active {
      display: flex;
    }
    .close-menu {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      font-size: 32px;
      color: white;
      cursor: pointer;
    }
    .mobile-nav-link {
      font-size: 22px;
      color: white;
      font-weight: 500;
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: white;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 45%;
    }
    .hero-right img {
      border-radius: 16px;
      box-shadow: 0 12px 30px rgba(0,0,0,0.08);
    }
    h1 {
      font-size: 38px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      line-height: 1.6;
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    /* 通用区块 */
    section {
      padding: 90px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 56px;
    }
    h2 {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .section-sub {
      font-size: 17px;
      color: var(--text-secondary);
      max-width: 640px;
      margin: 0 auto;
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px 20px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      cursor: pointer;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: #F0F2EC;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent);
      font-size: 22px;
      transition: 0.2s;
    }
    .service-card:hover .icon-circle {
      background: var(--accent);
      color: white;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-desc {
      font-size: 15px;
      color: var(--text-secondary);
      line-height: 1.7;
    }
    /* 优势数据 */
    .stats-bg {
      background: #F0F2EC;
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
    }
    .stat-item {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
    }
    .stat-label {
      font-size: 15px;
      color: var(--accent);
      font-weight: 500;
    }
    .stat-divider {
      width: 1px;
      height: 40px;
      background: #d9ddd1;
    }
    /* 案例卡片 */
    .cases-grid {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .case-row {
      display: flex;
      align-items: center;
      gap: 40px;
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .case-row:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      flex: 1 1 45%;
      overflow: hidden;
    }
    .case-img img {
      border-radius: 8px;
      transition: transform 0.3s ease;
      width: 100%;
      height: auto;
    }
    .case-row:hover .case-img img {
      transform: scale(1.03);
    }
    .case-content {
      flex: 1 1 55%;
      padding: 24px;
    }
    .badge {
      display: inline-block;
      background: var(--accent);
      color: white;
      font-size: 13px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 12px;
    }
    .case-title {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .case-result {
      color: var(--text-secondary);
      font-size: 16px;
    }
    /* 解决方案交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-text {
      flex: 1;
    }
    .solution-img {
      flex: 1;
    }
    .solution-img img {
      border-radius: 12px;
    }
    .feature-list {
      list-style: none;
      margin-top: 16px;
    }
    .feature-list li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 16px;
      margin-bottom: 10px;
      color: var(--text-secondary);
    }
    .feature-list li::before {
      content: "✓";
      color: var(--accent);
      font-weight: bold;
    }
    /* FAQ */
    .faq-section {
      background: #F5F6F1;
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
      font-weight: 500;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text-main);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #5A6A64;
      font-size: 15px;
      line-height: 1.7;
      padding-right: 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .faq-icon {
      font-size: 20px;
      font-weight: 300;
      color: var(--accent);
    }
    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1A3C34 0%, #0F2923 100%);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .cta-title {
      font-size: 34px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .cta-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      font-weight: 600;
    }
    /* 页脚 */
    .footer {
      background: #0F1E1A;
      color: #B0BDB8;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
    }
    .footer h4 {
      color: white;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .footer a {
      color: #B0BDB8;
      display: block;
      margin-bottom: 8px;
    }
    .footer a:hover {
      color: var(--accent);
    }
    .copyright {
      border-top: 1px solid #2A3A35;
      margin-top: 40px;
      padding-top: 20px;
      font-size: 13px;
      text-align: center;
    }
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-center, .nav-right .search-box, .nav-right .btn-login {
        display: none;
      }
      .mobile-menu-btn { display: block; }
      .hero-grid { flex-direction: column; }
      h1 { font-size: 32px; }
      .services-grid { grid-template-columns: 1fr; }
      .stats-grid { flex-direction: column; gap: 24px; align-items: center; }
      .stat-divider { display: none; }
      .case-row { flex-direction: column; }
      .solution-row, .solution-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }