/* roulang page: index */
:root {
      --primary: #1A5C6B;
      --primary-hover: #144D5A;
      --accent: #C89F6E;
      --accent-hover: #D4AB7A;
      --bg-page: #FAFAF8;
      --bg-section: #F2F0EB;
      --bg-card: #FFFFFF;
      --text-heading: #1A2A2F;
      --text-body: #3E4D52;
      --text-muted: #7A8A90;
      --border-light: #E8E5DF;
      --shadow-sm: 0 2px 12px rgba(26,92,107,0.06);
      --shadow-hover: 0 8px 24px rgba(26,92,107,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-body: "Inter", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-body);
      background-color: var(--bg-page);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, h5 {
      font-family: var(--font-heading);
      color: var(--text-heading);
      line-height: 1.3;
      margin-top: 0;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: color var(--transition);
    }
    a:hover {
      color: var(--primary-hover);
      text-decoration: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 16px;
      padding-right: 16px;
    }
    button, .button {
      font-family: var(--font-body);
      border-radius: var(--radius-btn);
      transition: all 0.2s ease;
      cursor: pointer;
      display: inline-block;
      font-weight: 600;
      border: none;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border: 2px solid var(--primary);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      border-color: var(--primary-hover);
      color: white;
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      padding: 14px 32px;
      border: 2px solid var(--primary);
    }
    .btn-outline:hover {
      background: rgba(26,92,107,0.05);
      color: var(--primary);
    }
    .btn-accent {
      background: var(--accent);
      color: #1A2A2F;
      padding: 16px 36px;
      font-weight: 700;
      border-radius: 8px;
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      color: #1A2A2F;
    }
    .section-spacing {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section-spacing {
        padding: 60px 0;
      }
    }
    .text-center {
      text-align: center;
    }
    .bg-section {
      background-color: var(--bg-section);
    }
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    /* 顶部信息条 */
    .top-bar-strip {
      background: #1A2A2F;
      color: var(--accent);
      font-size: 13px;
      height: 40px;
      line-height: 40px;
      display: flex;
      align-items: center;
      font-family: var(--font-body);
    }
    .top-bar-strip .container {
      display: flex;
      justify-content: space-between;
    }
    .phone-placeholder {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    /* 主导航 */
    .main-nav {
      background: white;
      height: 64px;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      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);
      font-family: var(--font-heading);
      letter-spacing: 1px;
    }
    .nav-links a {
      color: var(--text-body);
      margin-left: 32px;
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      font-size: 26px;
      color: var(--primary);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.05);
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        margin: 12px 0;
        font-size: 18px;
      }
      .hamburger {
        display: block;
      }
    }
    /* Hero */
    #hero {
      background: linear-gradient(180deg, #FAFAF8 0%, #F2F0EB 100%);
      min-height: 500px;
      display: flex;
      align-items: center;
      padding: 60px 0;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-text h1 {
      font-size: 48px;
      font-weight: 700;
      margin-bottom: 20px;
      color: var(--text-heading);
    }
    .hero-text p {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-image img {
      border-radius: 16px;
      box-shadow: 0 20px 35px rgba(26,92,107,0.1);
      width: 100%;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        gap: 40px;
      }
      .hero-text h1 {
        font-size: 36px;
      }
    }
    /* 功能区块 3x2 特殊布局 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-large {
      grid-column: span 2;
      grid-row: span 1;
      display: flex;
      flex-direction: column;
      justify-content: center;
      background: var(--bg-card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 48px;
      transition: var(--transition);
    }
    .feature-large:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .feature-small {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 28px 24px;
      transition: var(--transition);
    }
    .feature-small:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-placeholder {
      width: 32px;
      height: 32px;
      margin-bottom: 16px;
      background: #f0f3f2;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 20px;
    }
    .feature-title {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
      .feature-large {
        grid-column: span 1;
      }
    }
    /* 使用场景 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 60px;
    }
    .scenario-img {
      width: 50%;
      border-radius: 16px;
      overflow: hidden;
    }
    .scenario-text {
      width: 50%;
    }
    .tag {
      background: rgba(200,159,110,0.15);
      color: var(--accent);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .scenario-row {
        flex-direction: column;
      }
      .scenario-img, .scenario-text {
        width: 100%;
      }
    }
    /* 案例网格 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 24px;
    }
    .case-card-large {
      grid-column: span 2;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .case-content {
      padding: 20px;
    }
    .case-metric {
      font-size: 28px;
      font-weight: 700;
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .case-card-large {
        grid-column: span 1;
      }
    }
    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }
    .price-card {
      background: white;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      padding: 32px 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .price-card.popular {
      border: 2px solid var(--accent);
      padding: 48px 24px;
      box-shadow: 0 12px 28px rgba(26,92,107,0.1);
    }
    .badge {
      background: var(--accent);
      color: white;
      position: absolute;
      top: 12px;
      right: 12px;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
    }
    .price-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--text-heading);
    }
    .check-list {
      list-style: none;
      margin: 20px 0;
      padding: 0;
    }
    .check-list li {
      padding: 8px 0;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      padding: 20px 0;
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }
    .accordion-item.active .accordion-content {
      max-height: 300px;
      padding-bottom: 20px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary);
      color: white;
      padding: 80px 0;
      text-align: center;
    }
    .cta-banner h2 {
      color: white;
      font-size: 36px;
    }
    /* 页脚 */
    .footer {
      background: #1A2A2F;
      color: var(--text-muted);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer h4 {
      color: var(--accent);
      font-size: 16px;
      margin-bottom: 16px;
    }
    .footer a {
      color: var(--text-muted);
    }
    .footer a:hover {
      color: var(--accent);
    }
    .copyright {
      border-top: 1px solid rgba(122,138,144,0.2);
      margin-top: 40px;
      padding-top: 20px;
      font-size: 12px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 520px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }