/* roulang page: index */
:root {
      --primary-deep: #1B5E20;
      --secondary-vivid: #4CAF50;
      --accent-amber: #C88A3D;
      --bg-warm: #FAFBF7;
      --text-main: #1F2937;
      --text-secondary: #6B7280;
      --text-weak: #9CA3AF;
      --card-bg: #FFFFFF;
      --border-light: #E8EDE4;
      --shadow-sm: 0 4px 12px rgba(27, 94, 32, 0.06);
      --shadow-hover: 0 8px 24px rgba(27, 94, 32, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', 'PingFang SC', sans-serif;
      --spacing-section: 80px;
      --max-width: 1200px;
      --nav-height: 72px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    img {
      max-width: 100%;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.25s ease;
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: white;
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary-deep);
      gap: 8px;
    }

    .logo-dot {
      width: 12px;
      height: 12px;
      background-color: var(--secondary-vivid);
      border-radius: 50%;
      display: inline-block;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-weight: 600;
      color: var(--text-secondary);
      padding: 8px 0;
      position: relative;
      font-size: 0.95rem;
      letter-spacing: 0.3px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-deep);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--secondary-vivid);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary-deep);
      color: white;
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 140px;
      height: 48px;
      letter-spacing: 0.5px;
      box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .btn-primary:hover {
      background: var(--secondary-vivid);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      min-width: 140px;
      height: 48px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-outline:hover {
      background: rgba(76, 175, 80, 0.08);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary-deep);
      transition: 0.3s;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        height: 100vh;
        background: white;
        flex-direction: column;
        padding: 100px 40px 40px;
        gap: 28px;
        box-shadow: -4px 0 20px rgba(0,0,0,0.08);
        transition: right 0.3s ease;
        align-items: flex-start;
      }
      .nav-links.active {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
      .nav-links .btn-primary {
        width: 100%;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(105deg, #FAFBF7 0%, #E8F5E9 100%);
      padding: calc(var(--nav-height) + 60px) 0 80px;
      display: flex;
      align-items: center;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content h1 {
      font-family: var(--font-title);
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary-deep);
      margin-bottom: 20px;
    }

    .hero-content p {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 90%;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .hero-image img {
      border-radius: 16px;
      box-shadow: 0 10px 25px rgba(0,0,0,0.08);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 通用 section */
    section {
      padding: var(--spacing-section) 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }

    .section-title h2 {
      font-family: var(--font-title);
      font-size: 32px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-title p {
      color: var(--text-secondary);
      max-width: 640px;
      margin: 0 auto;
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .feature-card {
      background: var(--card-bg);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all 0.25s ease;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      color: var(--secondary-vivid);
      margin: 0 auto 20px;
    }

    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* 服务项目 */
    .service-item {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-bottom: 64px;
      align-items: center;
    }

    .service-item.reverse {
      direction: rtl;
    }

    .service-item.reverse .service-text {
      direction: ltr;
    }

    .service-text {
      position: relative;
    }

    .service-number {
      font-family: var(--font-number);
      font-size: 64px;
      font-weight: 700;
      color: rgba(76, 175, 80, 0.15);
      position: absolute;
      top: -24px;
      left: -8px;
      line-height: 1;
    }

    .service-text h3 {
      font-size: 24px;
      margin-bottom: 16px;
      position: relative;
      z-index: 1;
    }

    .service-text p {
      color: var(--text-secondary);
      margin-bottom: 24px;
    }

    .text-link {
      color: var(--primary-deep);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: gap 0.2s;
    }

    .text-link:hover {
      gap: 12px;
    }

    .service-image img {
      border-radius: var(--radius-card);
      width: 100%;
      height: 280px;
      object-fit: cover;
    }

    /* 数据滚动 */
    .stats-scroll {
      display: flex;
      gap: 40px;
      overflow-x: auto;
      padding: 20px 0;
      justify-content: center;
      flex-wrap: nowrap;
      text-align: center;
    }

    .stat-item {
      flex: 0 0 auto;
      min-width: 160px;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-amber);
      line-height: 1.2;
    }

    .stat-label {
      color: var(--text-secondary);
      margin-top: 8px;
      border-top: 1px solid var(--border-light);
      padding-top: 8px;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      aspect-ratio: 16/9;
      overflow: hidden;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s;
    }

    .case-card:hover .case-img img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

    .case-tags {
      display: flex;
      gap: 8px;
      margin: 12px 0;
    }

    .tag {
      background: #F0F7F0;
      color: var(--primary-deep);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* 流程 */
    .timeline {
      display: flex;
      justify-content: space-between;
      position: relative;
    }

    .timeline::before {
      content: '';
      position: absolute;
      top: 20px;
      left: 5%;
      width: 90%;
      height: 1px;
      background: #D1D5DB;
      z-index: 0;
    }

    .timeline-step {
      text-align: center;
      flex: 1;
      position: relative;
      z-index: 1;
    }

    .step-circle {
      width: 40px;
      height: 40px;
      background: var(--secondary-vivid);
      border-radius: 50%;
      margin: 0 auto 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
    }

    /* FAQ */
    .faq-list {
      max-width: 720px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }

    .faq-question {
      display: flex;
      align-items: center;
      gap: 16px;
      cursor: pointer;
      font-weight: 600;
      font-size: 1.1rem;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding-left: 40px;
      color: var(--text-secondary);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA */
    .cta-section {
      background-color: var(--primary-deep);
      position: relative;
      overflow: hidden;
    }

    .cta-section::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: radial-gradient(circle, rgba(255,255,255,0.05) 1px, transparent 1px);
      background-size: 24px 24px;
    }

    .cta-content {
      position: relative;
      z-index: 1;
      text-align: center;
      color: white;
    }

    .cta-form {
      display: flex;
      gap: 16px;
      margin-top: 32px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .cta-form input {
      padding: 14px 16px;
      border-radius: var(--radius-btn);
      border: none;
      background: white;
      min-width: 200px;
    }

    .btn-amber {
      background: var(--accent-amber);
      color: white;
      border: none;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
    }

    /* 页脚 */
    .footer {
      background: #1F2937;
      color: #E5E7EB;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .service-item {
        grid-template-columns: 1fr;
      }
      .features-grid, .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .features-grid, .cases-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 32px;
      }
      .timeline {
        flex-direction: column;
        gap: 24px;
      }
      .timeline::before {
        display: none;
      }
      .cta-form {
        flex-direction: column;
        align-items: center;
      }
    }