/* roulang page: index */
:root {
      --primary-deep: #0B5E42;
      --primary-soft: rgba(11, 94, 66, 0.1);
      --accent-orange: #F57C00;
      --accent-orange-hover: #E06900;
      --bg-warm: #F9F9F6;
      --bg-light-green: #EDF2EF;
      --text-dark: #1F2937;
      --text-mid: #374151;
      --text-soft: #6B7280;
      --text-light: #D1D5DB;
      --white: #FFFFFF;
      --border-light: #E5E7EB;
      --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.06);
      --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --max-width: 1200px;
      --nav-height: 64px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-family);
      background-color: var(--white);
      color: var(--text-mid);
      line-height: 1.6;
      font-size: 16px;
      overflow-x: hidden;
    }

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease, background-color 0.2s ease;
    }

    h1, h2, h3, h4 {
      color: var(--text-dark);
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 40px;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 30px;
      font-weight: 600;
    }

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

    h4 {
      font-size: 18px;
      font-weight: 600;
    }

    .section {
      padding: 80px 0;
    }

    .section-bg-light {
      background-color: var(--bg-light-green);
    }

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

    /* 按钮系统 */
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      text-align: center;
      font-size: 16px;
      padding: 12px 28px;
      line-height: 1.2;
    }

    .btn-primary {
      background-color: var(--accent-orange);
      color: white;
      box-shadow: 0 4px 10px rgba(245, 124, 0, 0.2);
    }

    .btn-primary:hover {
      background-color: var(--accent-orange-hover);
      box-shadow: 0 6px 14px rgba(245, 124, 0, 0.3);
      transform: translateY(-1px);
    }

    .btn-secondary {
      background: transparent;
      color: var(--primary-deep);
      border: 1px solid var(--primary-deep);
    }

    .btn-secondary:hover {
      background-color: var(--primary-soft);
    }

    .btn-large {
      padding: 16px 40px;
      font-size: 18px;
      border-radius: 12px;
    }

    .btn-text {
      background: transparent;
      color: var(--primary-deep);
      font-weight: 600;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: border-color 0.2s;
    }

    .btn-text:hover {
      border-bottom-color: var(--primary-deep);
    }

    .btn-text i {
      margin-left: 6px;
      font-size: 14px;
      transition: transform 0.2s;
    }

    .btn-text:hover i {
      transform: translateX(4px);
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      height: var(--nav-height);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo i {
      font-size: 26px;
      color: var(--accent-orange);
    }

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

    .nav-links a {
      font-weight: 500;
      color: var(--text-mid);
      font-size: 15px;
      position: relative;
      padding: 8px 0;
    }

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

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

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

    .nav-cta {
      margin-left: 20px;
    }

    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--text-dark);
      cursor: pointer;
    }

    .mobile-menu {
      display: none;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #EDF2EF 0%, #F9F9F6 100%);
      padding: 60px 0 80px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-content {
      flex: 1;
    }

    .hero-content h1 {
      color: var(--primary-deep);
      margin-bottom: 16px;
    }

    .hero-content .subtitle {
      font-size: 20px;
      color: var(--text-soft);
      margin-bottom: 24px;
      font-weight: 400;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      gap: 20px;
      margin-top: 32px;
      flex-wrap: wrap;
    }

    .hero-image {
      flex: 1;
      text-align: right;
    }

    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 30px rgba(0, 0, 0, 0.08);
      width: 100%;
      max-height: 420px;
      object-fit: cover;
    }

    /* 卡片系统 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

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

    .card-body {
      padding: 24px;
    }

    .icon-circle {
      width: 56px;
      height: 56px;
      background: var(--primary-soft);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      color: var(--primary-deep);
      font-size: 24px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    /* 服务体系卡片 */
    .service-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: var(--radius-card) var(--radius-card) 0 0;
    }

    .service-list {
      list-style: none;
      margin-top: 12px;
    }

    .service-list li {
      display: flex;
      align-items: flex-start;
      gap: 8px;
      margin-bottom: 8px;
      font-size: 15px;
      color: var(--text-mid);
    }

    .service-list li i {
      color: var(--primary-deep);
      font-size: 14px;
      margin-top: 4px;
    }

    /* 场景区块 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }

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

    .scenario-img {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
    }

    .scenario-img img {
      border-radius: 20px;
      width: 100%;
      height: 280px;
      object-fit: cover;
    }

    .scenario-text {
      flex: 1;
    }

    .badge {
      background-color: var(--primary-soft);
      color: var(--primary-deep);
      border-radius: var(--radius-pill);
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 数据见证 */
    .testimonial-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
    }

    .testimonial-card {
      min-width: 240px;
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-card);
      text-align: center;
    }

    .big-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary-deep);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

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

    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 18px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
      font-weight: 600;
      color: var(--text-dark);
      cursor: pointer;
      text-align: left;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.25s;
      color: var(--text-soft);
      font-size: 16px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }

    .faq-icon {
      transition: transform 0.3s;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-block {
      background: var(--primary-deep);
      color: white;
      padding: 80px 0;
      text-align: center;
      border-radius: 0;
    }

    .cta-block h2 {
      color: white;
    }

    /* Footer */
    .footer {
      background: #1F2937;
      color: var(--text-light);
      padding: 60px 0 0;
    }

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

    .footer h4 {
      color: white;
      margin-bottom: 16px;
    }

    .footer a {
      color: #D1D5DB;
      display: block;
      margin-bottom: 10px;
    }

    .footer a:hover {
      color: var(--accent-orange);
    }

    .copyright {
      background: #111827;
      padding: 16px 0;
      margin-top: 40px;
      font-size: 13px;
      text-align: center;
    }

    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 30px;
      }
      h2 {
        font-size: 24px;
      }
      .section {
        padding: 60px 0;
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: white;
        box-shadow: -4px 0 20px rgba(0,0,0,0.1);
        padding: 24px;
        transition: right 0.3s ease;
        z-index: 200;
      }
      .mobile-menu.open {
        right: 0;
      }
      .mobile-menu a {
        padding: 14px 0;
        font-size: 18px;
        border-bottom: 1px solid #f0f0f0;
      }
      .close-menu {
        align-self: flex-end;
        font-size: 28px;
        background: none;
        border: none;
      }
      .hero-grid {
        flex-direction: column;
      }
      .hero-image {
        order: -1;
        text-align: center;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .scenario-row, .scenario-row.reverse {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }