/* roulang page: index */
:root {
      --primary-green: #0F9B4E;
      --deep-charcoal: #1E1E1E;
      --warm-stone: #F5F3EF;
      --electric-white: #FAFAFA;
      --body-text: #2C2C2C;
      --secondary-text: #6B6B6B;
      --border-light: #E8E6E1;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 24px rgba(0,0,0,0.08);
      --transition: 0.25s ease;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
      --section-gap-desktop: 120px;
      --section-gap-tablet: 80px;
      --section-gap-mobile: 60px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      color: var(--body-text);
      background-color: #fff;
      margin: 0;
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      margin-top: 0;
      color: var(--deep-charcoal);
    }

    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-size: 36px;
      margin-bottom: 24px;
      position: relative;
      display: inline-block;
    }

    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 48px;
      height: 4px;
      background-color: var(--primary-green);
      border-radius: 2px;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    a {
      color: var(--primary-green);
      transition: color var(--transition);
    }

    a:hover {
      color: #0B7A3D;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航胶囊 */
    .capsule-nav {
      position: fixed;
      top: 24px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 95%;
      background: rgba(30,30,30,0.88);
      backdrop-filter: blur(12px);
      border-radius: 40px;
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 1000;
      box-shadow: 0 8px 20px rgba(0,0,0,0.15);
      transition: background 0.3s ease;
    }

    .capsule-nav.scrolled {
      background: rgba(30,30,30,0.92);
      backdrop-filter: blur(16px);
    }

    .nav-logo {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 20px;
      color: var(--primary-green);
      letter-spacing: 1px;
      margin-right: 32px;
      white-space: nowrap;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }

    .nav-links a {
      color: white;
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      transition: color var(--transition);
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--primary-green);
    }

    .nav-cta {
      background: var(--primary-green);
      color: white !important;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      letter-spacing: 0.5px;
      transition: background var(--transition), transform var(--transition);
    }

    .nav-cta:hover {
      background: #0B7A3D;
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 24px;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(135deg, rgba(15,155,78,0.08) 0%, rgba(30,30,30,0.03) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: relative;
    }

    .hero-content {
      max-width: 800px;
      padding: 0 20px;
    }

    .hero h1 {
      color: var(--deep-charcoal);
      margin-bottom: 24px;
      font-size: 52px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--secondary-text);
      margin-bottom: 40px;
      line-height: 1.6;
    }

    .btn-group {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-block;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 8px;
      text-decoration: none;
      letter-spacing: 1px;
      transition: all var(--transition);
      font-size: 16px;
    }

    .btn-primary {
      background: var(--primary-green);
      color: white;
      border: 2px solid var(--primary-green);
    }

    .btn-primary:hover {
      background: #0B7A3D;
      border-color: #0B7A3D;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(15,155,78,0.3);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary-green);
      border: 2px solid var(--primary-green);
    }

    .btn-outline:hover {
      background: rgba(15,155,78,0.05);
      transform: translateY(-2px);
    }

    /* 板块通用 */
    section {
      padding: var(--section-gap-desktop) 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }

    .section-header h2 {
      margin-bottom: 16px;
    }

    .bg-stone {
      background-color: var(--warm-stone);
    }

    /* 核心优势 不对称栅格 */
    .advantage-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 32px;
      align-items: start;
    }

    .advantage-main {
      background: white;
      border-radius: 12px;
      padding: 40px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .advantage-side {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .advantage-card {
      background: white;
      border-radius: 12px;
      padding: 28px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-light);
      transition: all var(--transition);
    }

    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(15,155,78,0.3);
    }

    .icon-green {
      color: var(--primary-green);
      font-size: 32px;
      margin-bottom: 16px;
    }

    .big-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary-green);
      line-height: 1.2;
    }

    /* 服务矩阵 左右交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .service-row.reverse {
      flex-direction: row-reverse;
    }

    .service-img {
      flex: 1;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: transform 0.3s ease;
    }

    .service-img:hover {
      transform: scale(1.02);
    }

    .service-text {
      flex: 1;
    }

    .service-text ul {
      list-style: none;
      padding-left: 0;
    }

    .service-text li {
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .service-text li i {
      color: var(--primary-green);
      font-size: 8px;
    }

    /* 实力数据 */
    .stats-container {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      background: white;
      padding: 48px 20px;
      border-top: 4px solid var(--primary-green);
      box-shadow: var(--card-shadow);
      border-radius: 12px;
    }

    .stat-item .count {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary-green);
    }

    /* 案例网格 */
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .case-card {
      background: white;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: all var(--transition);
      position: relative;
    }

    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
    }

    .case-img {
      height: 240px;
      background-size: cover;
      background-position: center;
      position: relative;
    }

    .case-overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: rgba(0,0,0,0.4);
      display: flex;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: opacity 0.3s;
      color: white;
      font-weight: 600;
    }

    .case-card:hover .case-overlay {
      opacity: 1;
    }

    .case-info {
      padding: 24px;
    }

    .tag {
      background: rgba(15,155,78,0.1);
      color: var(--primary-green);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 12px;
    }

    .accordion-title {
      font-size: 18px;
      font-weight: 600;
      padding: 18px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color var(--transition);
    }

    .accordion-title:hover {
      color: var(--primary-green);
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--secondary-text);
      padding-left: 8px;
      border-left: 3px solid transparent;
    }

    .accordion-item.active .accordion-content {
      max-height: 300px;
      padding-bottom: 18px;
      border-left-color: var(--primary-green);
    }

    /* 联系CTA */
    .contact-section {
      background: var(--deep-charcoal);
      color: white;
    }

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

    .contact-form input, .contact-form textarea {
      background: transparent;
      border: 1.5px solid #444;
      color: white;
      border-radius: 8px;
      padding: 14px;
      margin-bottom: 20px;
      width: 100%;
    }

    .contact-form input:focus, .contact-form textarea:focus {
      border-color: var(--primary-green);
      outline: none;
      box-shadow: 0 0 0 2px rgba(15,155,78,0.3);
    }

    .contact-info i {
      color: var(--primary-green);
      width: 24px;
      margin-right: 12px;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-charcoal);
      color: #aaa;
      padding: 40px 0 20px;
    }

    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 30px;
    }

    .social-icons i {
      font-size: 20px;
      margin-right: 20px;
      color: #aaa;
      transition: color var(--transition);
      cursor: pointer;
    }

    .social-icons i:hover {
      color: var(--primary-green);
    }

    @media (max-width: 1024px) {
      h1 { font-size: 40px; }
      .advantage-grid { grid-template-columns: 1fr; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .case-grid { grid-template-columns: 1fr; }
      .contact-grid { grid-template-columns: 1fr; }
      section { padding: var(--section-gap-tablet) 0; }
    }

    @media (max-width: 768px) {
      .capsule-nav { padding: 8px 20px; }
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 80px;
        left: 20px;
        right: 20px;
        background: rgba(30,30,30,0.96);
        backdrop-filter: blur(20px);
        border-radius: 24px;
        padding: 30px;
        flex-direction: column;
        gap: 20px;
        z-index: 999;
      }
      .mobile-menu.active { display: flex; }
      h1 { font-size: 36px; }
      .hero { min-height: 500px; }
      .btn-group { flex-direction: column; align-items: center; }
      section { padding: var(--section-gap-mobile) 0; }
      .stats-container { gap: 24px; }
    }