/* roulang page: index */
:root {
      --primary: #0E8C5A;
      --primary-dark: #0B7048;
      --secondary: #3FA2F7;
      --accent: #F57C2E;
      --bg-light: #F9FBF8;
      --bg-green: #F0F8F4;
      --dark-bg: #0C2E22;
      --footer-bg: #1A2E24;
      --text-main: #1A2E24;
      --text-secondary: #5A6E64;
      --text-weak: #8FA098;
      --white: #ffffff;
      --border-light: #D0DDD6;
      --shadow-sm: 0 4px 20px rgba(14,140,90,0.06);
      --shadow-md: 0 8px 30px rgba(14,140,90,0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-tag: 30px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Outfit", "Inter", sans-serif;
    }
    * {
      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;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
      letter-spacing: -0.5px;
      font-weight: 700;
    }
    h2 {
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }
    p {
      color: var(--text-secondary);
      margin-bottom: 16px;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.3s ease;
      border: 2px solid transparent;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      border-color: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(14,140,90,0.2);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background: #E8F5EF;
      transform: translateY(-2px);
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border-color: var(--accent);
      font-weight: 700;
    }
    .btn-accent:hover {
      filter: brightness(1.1);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(245,124,46,0.3);
    }
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      h1 {
        font-size: 36px;
      }
      h2 {
        font-size: 28px;
      }
      h3 {
        font-size: 20px;
      }
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      z-index: 100;
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      height: 72px;
      display: flex;
      align-items: center;
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 1px;
    }
    .logo svg {
      width: 32px;
      height: 32px;
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-menu a {
      font-weight: 600;
      font-size: 16px;
      color: var(--text-main);
      padding: 8px 0;
      border-bottom: 3px solid transparent;
      transition: all 0.2s;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      display: block;
      width: 26px;
      height: 2px;
      background: var(--text-main);
      border-radius: 4px;
      transition: 0.2s;
    }
    .mobile-nav {
      display: none;
    }
    @media (max-width: 1024px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-nav.active {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--dark-bg);
        padding: 32px 24px;
        gap: 20px;
        z-index: 99;
      }
      .mobile-nav a {
        color: white;
        font-size: 20px;
        font-weight: 600;
        padding: 12px 16px;
        border-radius: 12px;
        background: rgba(255,255,255,0.05);
      }
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: radial-gradient(circle at 80% 20%, rgba(63,162,247,0.08) 0%, transparent 60%);
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-content {
      flex: 1;
    }
    .hero-content h1 {
      margin-bottom: 20px;
      color: var(--text-main);
    }
    .hero-content .subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-md);
      position: relative;
    }
    .hero-image img {
      width: 100%;
      height: 400px;
      object-fit: cover;
      display: block;
    }
    .hero-image::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(14,140,90,0.04);
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-image img {
        height: 280px;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* 通用板块标题 */
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      color: var(--text-main);
    }
    .section-title p {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto;
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      text-align: center;
      border: 1px solid rgba(14,140,90,0.05);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .service-icon {
      font-size: 48px;
      margin-bottom: 20px;
      color: var(--primary);
    }
    .service-card h3 {
      margin-bottom: 12px;
    }
    .service-card p {
      font-size: 15px;
      color: var(--text-weak);
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 优势数据 */
    .advantages {
      background: linear-gradient(180deg, #F0F8F4 0%, #F9FBF8 100%);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-item .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }
    .stat-label {
      font-size: 16px;
      color: var(--text-secondary);
      margin-top: 8px;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.3s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .case-img {
      position: relative;
      height: 240px;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-img::after {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(14,140,90,0.05);
    }
    .case-tag {
      position: absolute;
      top: 16px;
      left: 16px;
      background: rgba(63,162,247,0.15);
      color: var(--secondary);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      backdrop-filter: blur(4px);
    }
    .case-content {
      padding: 24px;
    }
    .case-content h3 {
      margin-bottom: 8px;
    }
    .case-content p {
      font-size: 15px;
      color: var(--text-weak);
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 40px;
      text-align: center;
    }
    .step {
      flex: 1;
    }
    .step-icon {
      width: 72px;
      height: 72px;
      background: var(--bg-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: var(--primary);
      font-size: 32px;
    }
    .step h4 {
      font-weight: 700;
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .process-steps {
        flex-direction: column;
        gap: 32px;
      }
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 16px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      overflow: hidden;
      border-left: 4px solid var(--primary);
      transition: 0.2s;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #F7FAF8;
      padding: 0 24px;
    }
    .faq-answer p {
      padding: 16px 0;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }
    /* CTA */
    .cta-section {
      background: var(--dark-bg);
      color: white;
      text-align: center;
    }
    .cta-section h2 {
      color: white;
      margin-bottom: 20px;
    }
    .cta-section .subtitle {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    /* 页脚 */
    .footer {
      background: var(--footer-bg);
      color: #B7C9C0;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 20px;
      font-size: 18px;
    }
    .footer a {
      color: #B7C9C0;
      display: block;
      margin-bottom: 12px;
      transition: color 0.2s;
    }
    .footer a:hover {
      color: white;
    }
    .copyright {
      text-align: center;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .text-accent {
      color: var(--accent);
    }