/* roulang page: index */
:root {
      --green: #2E7D32;
      --green-light: #4CAF50;
      --green-bg: #F1F8E9;
      --orange: #F57C00;
      --orange-dark: #E65100;
      --brown: #4E342E;
      --brown-light: #8D6E63;
      --warm-bg: #FAF7F2;
      --white: #FFFFFF;
      --sky-blue: #0288D1;
      --text-main: #2D2D2D;
      --text-soft: #5D5D5D;
      --text-light: #BCAAA4;
      --border-light: #E0D8CE;
      --shadow-card: 0 8px 24px rgba(46, 125, 50, 0.06);
      --shadow-hover: 0 16px 36px rgba(46, 125, 50, 0.12);
      --radius-md: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
      --container: 1200px;
      --nav-height: 72px;
    }

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

    body {
      font-family: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--warm-bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.3px;
      line-height: 1.3;
    }

    h1 {
      font-size: clamp(2.5rem, 5vw, 3.5rem);
      color: var(--brown);
    }

    h2 {
      font-size: clamp(2rem, 4vw, 2.6rem);
      margin-bottom: 1rem;
      color: var(--brown);
    }

    h3 {
      font-size: 1.3rem;
    }

    p {
      color: var(--text-soft);
      max-width: 720px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    .section {
      padding: 80px 0;
    }

    .section-label {
      display: inline-block;
      background: var(--green-bg);
      color: var(--green);
      font-weight: 600;
      font-size: 0.9rem;
      padding: 6px 16px;
      border-radius: 20px;
      margin-bottom: 16px;
      letter-spacing: 0.5px;
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(10px);
      z-index: 100;
      height: var(--nav-height);
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(46, 125, 50, 0.08);
      transition: box-shadow 0.3s;
    }

    .header.scrolled {
      box-shadow: 0 8px 24px rgba(46, 125, 50, 0.08);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--green);
      letter-spacing: -0.3px;
    }

    .logo i {
      font-size: 2rem;
      color: var(--orange);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 500;
    }

    .nav-links a {
      color: var(--brown);
      font-size: 1rem;
      position: relative;
      padding: 6px 0;
    }

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

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

    .btn-primary {
      background: var(--orange);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: background 0.2s, transform 0.1s;
      display: inline-block;
      text-align: center;
      border: none;
    }

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

    .btn-outline {
      background: transparent;
      border: 2px solid var(--green);
      color: var(--green);
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
    }

    .btn-outline:hover {
      background: var(--green);
      color: white;
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--brown);
    }

    /* Hero */
    .hero {
      padding: calc(var(--nav-height) + 60px) 0 80px;
      background: radial-gradient(circle at 20% 30%, rgba(46,125,50,0.04) 0%, transparent 50%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-text h1 {
      margin-bottom: 1.5rem;
    }

    .hero-text .subtitle {
      font-size: 1.2rem;
      color: var(--brown-light);
      margin-bottom: 2rem;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-image {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 24px 48px rgba(46,125,50,0.15);
      background: var(--green-bg);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    .decor-ring {
      position: absolute;
      width: 120px;
      height: 120px;
      border: 2px dashed rgba(245,124,0,0.3);
      border-radius: 50%;
      top: -30px;
      right: -30px;
      z-index: 1;
    }

    /* 优势卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .feature-card {
      background: var(--white);
      padding: 32px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: all 0.3s ease;
      border: 1px solid transparent;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(46,125,50,0.2);
    }

    .feature-icon {
      font-size: 2.8rem;
      color: var(--green);
      margin-bottom: 20px;
    }

    /* 服务卡片 错落网格 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 28px;
      margin-top: 40px;
    }

    .service-card {
      background: white;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
      display: flex;
      flex-direction: column;
    }

    .service-card.large {
      grid-row: span 2;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    .service-body {
      padding: 24px;
    }

    .service-body h3 {
      color: var(--brown);
      margin-bottom: 10px;
    }

    .tag {
      background: var(--green-bg);
      color: var(--green);
      font-size: 0.8rem;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-top: 12px;
    }

    /* 数据统计 */
    .stats-band {
      background: var(--green-bg);
      padding: 60px 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 30px;
    }

    .stat-number {
      font-family: 'Rubik', sans-serif;
      font-size: 3rem;
      font-weight: 700;
      color: var(--green);
    }

    /* 案例水平滚动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding: 20px 0 30px;
      scroll-snap-type: x mandatory;
    }

    .case-card {
      flex: 0 0 340px;
      background: white;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      scroll-snap-align: start;
      transition: 0.2s;
    }

    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      height: 200px;
      background-size: cover;
      border-radius: 12px 12px 0 0;
    }

    .case-info {
      padding: 20px;
    }

    /* 流程 */
    .process-flow {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      margin-top: 40px;
    }

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

    .step-circle {
      width: 60px;
      height: 60px;
      background: var(--green);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.5rem;
      margin: 0 auto 16px;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--brown);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-soft);
      padding-right: 30px;
    }

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

    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, #2E7D32 0%, #F57C00 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
      position: relative;
      overflow: hidden;
    }

    .cta-band h2 {
      color: white;
    }

    .btn-white {
      background: white;
      color: var(--orange);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
    }

    /* 页脚 */
    .footer {
      background: var(--brown);
      color: var(--text-light);
      padding: 60px 0 30px;
    }

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

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

    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-links { 
        position: fixed; top: var(--nav-height); left: 0; background: white; width: 100%; 
        flex-direction: column; padding: 30px; gap: 24px; display: none; 
      }
      .nav-links.open { display: flex; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr; }
    }