/* roulang page: index */
:root {
      --primary: #0D4B45;
      --primary-light: rgba(13,75,69,0.08);
      --secondary: #C49A6C;
      --bg-warm: #F7F5F2;
      --bg-light: #F0EDE8;
      --text-heading: #1E2A2F;
      --text-body: #3A4549;
      --text-soft: #6B7579;
      --accent: #E07B39;
      --accent-hover: #C96A2E;
      --white: #FFFFFF;
      --card-shadow: 0 2px 12px rgba(13,75,69,0.06);
      --card-shadow-hover: 0 8px 24px rgba(13,75,69,0.12);
      --border-light: rgba(13,75,69,0.08);
      --radius-card: 12px;
      --radius-btn: 30px;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      background: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      padding-top: 72px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      text-decoration: underline;
      text-underline-offset: 4px;
      text-decoration-thickness: 2px;
    }
    h1, h2, h3 {
      color: var(--text-heading);
      font-weight: 600;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      white-space: nowrap;
    }
    .logo span {
      color: var(--secondary);
    }
    .desktop-nav {
      display: flex;
      gap: 32px;
    }
    .desktop-nav a {
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 0;
      border-bottom: 3px solid transparent;
      transition: var(--transition);
      font-size: 16px;
    }
    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--primary);
      border-bottom-color: var(--secondary);
      text-decoration: none;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary);
      cursor: pointer;
    }
    .mobile-menu-overlay {
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(8px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 99;
      transform: translateX(100%);
      transition: transform 0.3s ease;
    }
    .mobile-menu-overlay.open {
      transform: translateX(0);
    }
    .mobile-menu-overlay a {
      font-size: 22px;
      font-weight: 500;
      color: var(--text-heading);
    }
    /* 底部移动Tab */
    .mobile-bottom-tab {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: var(--white);
      border-top: 1px solid #e0dcd6;
      z-index: 110;
      justify-content: space-around;
      align-items: center;
      padding: 0 8px;
    }
    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-soft);
      font-size: 12px;
      transition: var(--transition);
    }
    .tab-item i {
      font-size: 20px;
      margin-bottom: 2px;
    }
    .tab-item.active {
      color: var(--primary);
    }
    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 600;
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .section-sub {
      color: var(--text-soft);
      font-size: 18px;
      margin-bottom: 48px;
    }
    .bg-light-section {
      background: var(--bg-light);
    }
    /* 按钮 */
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      text-align: center;
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      font-size: 16px;
      letter-spacing: 0.3px;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      box-shadow: 0 4px 10px rgba(224,123,57,0.25);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(224,123,57,0.35);
      text-decoration: none;
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(13,75,69,0.05);
      text-decoration: none;
    }
    .btn-white {
      background: white;
      color: var(--primary);
      font-weight: 600;
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #F7F5F2 0%, rgba(13,75,69,0.03) 100%);
      padding: 60px 0 80px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text {
      flex: 1;
    }
    .hero-text h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-text p {
      font-size: 20px;
      color: var(--text-body);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 360px;
      border-radius: 24px;
      box-shadow: var(--card-shadow);
      background-blend-mode: overlay;
      background-color: rgba(13,75,69,0.05);
    }
    /* 痛点 */
    .pain-item {
      display: flex;
      gap: 24px;
      margin-bottom: 32px;
      background: var(--white);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
    }
    .pain-icon {
      font-size: 36px;
      color: var(--secondary);
    }
    /* 方案卡片 */
    .solutions-grid {
      display: grid;
      grid-template-columns: 1.35fr 1fr 1fr;
      gap: 28px;
    }
    .solution-card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      overflow: hidden;
      border: 1px solid var(--border-light);
    }
    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-shadow-hover);
    }
    .card-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      border-radius: 12px 12px 0 0;
    }
    .card-content {
      padding: 24px 28px;
    }
    /* 数据 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
    }
    .stat-item {
      text-align: center;
      border: 1px solid var(--secondary);
      border-radius: 16px;
      padding: 24px 32px;
      min-width: 150px;
    }
    .stat-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
    }
    /* 证言 */
    .testimonial-card {
      background: #F2F7F6;
      border-left: 4px solid var(--primary);
      padding: 28px;
      border-radius: 0 var(--radius-card) var(--radius-card) 0;
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid #E8E5E0;
    }
    .accordion-header {
      font-size: 18px;
      font-weight: 500;
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #FAF9F7;
      padding: 0 16px;
    }
    .accordion-content.open {
      max-height: 200px;
      padding: 16px;
    }
    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
      text-align: center;
    }
    .footer {
      background: #1E2A2F;
      color: #B0B8BC;
      padding: 48px 0 24px;
    }
    .footer a {
      color: #B0B8BC;
    }
    .footer a:hover {
      color: var(--secondary);
    }
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .solutions-grid {
        grid-template-columns: 1fr 1fr;
      }
      .desktop-nav {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .mobile-bottom-tab {
        display: flex;
      }
      body {
        padding-bottom: 60px;
      }
    }
    @media (max-width: 640px) {
      .solutions-grid {
        grid-template-columns: 1fr;
      }
      .hero-text h1 {
        font-size: 36px;
      }
    }