/* roulang page: index */
:root {
      --brand-primary: #1B4D3E;
      --brand-accent: #D4A843;
      --bg-white: #FFFFFF;
      --bg-light: #F4F7F6;
      --text-dark: #0B1E1A;
      --text-body: #4A5B56;
      --text-muted: #6B7D78;
      --border-light: #E8EDEB;
      --border-input: #D1D8D5;
      --danger: #C0392B;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 8px;
      --shadow-nav: 0 1px 8px rgba(0,0,0,0.04);
      --max-width: 1200px;
      --space-section: 100px;
    }

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

    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      color: var(--text-body);
      background: var(--bg-white);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid transparent;
      transition: box-shadow 0.2s ease, border-color 0.2s ease;
      z-index: 100;
      display: flex;
      align-items: center;
    }

    .site-header.scrolled {
      box-shadow: var(--shadow-nav);
      border-bottom-color: var(--border-light);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: -0.02em;
    }

    .logo i {
      font-size: 28px;
      color: var(--brand-primary);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

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

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--text-dark);
      cursor: pointer;
      padding: 8px;
    }

    /* 移动端导航 */
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: calc(100vh - 72px);
        background: #fff;
        flex-direction: column;
        padding: 40px 24px;
        gap: 24px;
        font-size: 18px;
        align-items: flex-start;
        overflow-y: auto;
        z-index: 99;
        box-shadow: 0 4px 12px rgba(0,0,0,0.05);
      }

      .nav-links.active {
        display: flex;
      }

      .hamburger {
        display: block;
      }
    }

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

    @media (max-width: 640px) {
      section {
        padding: 60px 0;
      }
    }

    .section-title {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.25;
      color: var(--text-dark);
      margin-bottom: 24px;
      letter-spacing: -0.02em;
    }

    @media (max-width: 640px) {
      .section-title {
        font-size: 28px;
      }
    }

    /* 按钮 */
    .btn {
      display: inline-block;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      text-align: center;
      transition: background 0.2s, color 0.2s, border-color 0.2s;
      cursor: pointer;
      border: 2px solid transparent;
    }

    .btn-primary {
      background: var(--brand-primary);
      color: #fff;
      border-color: var(--brand-primary);
    }

    .btn-primary:hover {
      background: #153F32;
      border-color: #153F32;
      color: #fff;
    }

    .btn-outline {
      background: transparent;
      color: var(--brand-primary);
      border-color: var(--brand-primary);
    }

    .btn-outline:hover {
      background: var(--brand-primary);
      color: #fff;
    }

    /* 卡片 */
    .card {
      background: #fff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      transition: transform 0.25s ease, border-color 0.25s ease;
      overflow: hidden;
    }

    .card:hover {
      border-color: var(--brand-primary);
      transform: translateY(-4px);
    }

    /* Hero */
    .hero {
      padding: 160px 0 120px;
      background-color: #fff;
      position: relative;
      overflow: hidden;
    }

    .hero .bg-layer {
      position: absolute;
      right: -10%;
      top: 10%;
      width: 55%;
      height: 90%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.06;
      pointer-events: none;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }

    .hero h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.15;
      color: var(--text-dark);
      letter-spacing: -0.02em;
      margin-bottom: 24px;
    }

    .hero p {
      font-size: 20px;
      line-height: 1.6;
      color: var(--text-body);
      max-width: 640px;
      margin-bottom: 32px;
    }

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

    @media (max-width: 640px) {
      .hero h1 {
        font-size: 36px;
      }
      .hero p {
        font-size: 18px;
      }
      .hero {
        padding: 120px 0 80px;
      }
    }

    /* 服务卡片差异化 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .service-card {
      position: relative;
      padding: 32px 24px;
    }

    .service-card.first::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: var(--brand-primary);
      border-radius: 12px 12px 0 0;
    }

    .service-icon {
      font-size: 48px;
      color: var(--brand-primary);
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 12px;
    }

    .service-card p {
      font-size: 16px;
      color: var(--text-muted);
    }

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

    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 优势数据 左数据右文字 */
    .advantages-wrapper {
      display: flex;
      gap: 60px;
      align-items: center;
      background: var(--bg-light);
      padding: 80px 0;
      margin: 0 -24px;
      padding-left: 24px;
      padding-right: 24px;
    }

    .adv-data {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 32px;
    }

    .adv-item .number {
      font-size: 48px;
      font-weight: 700;
      color: var(--brand-primary);
      line-height: 1.1;
    }

    .adv-item .label {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
    }

    .adv-text {
      flex: 1;
      font-size: 16px;
      color: var(--text-body);
      line-height: 1.7;
    }

    @media (max-width: 768px) {
      .advantages-wrapper {
        flex-direction: column;
      }
    }

    /* 案例卡片 2列大卡 */
    .cases-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .case-card .card-img {
      height: 260px;
      overflow: hidden;
    }

    .case-card .card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

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

    .case-card .card-body {
      padding: 24px;
    }

    .case-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .case-card p {
      font-size: 15px;
      color: var(--text-muted);
    }

    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 解决方案 左右交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

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

    .solution-img {
      flex: 1;
    }

    .solution-img img {
      border-radius: var(--radius-img);
    }

    .solution-text {
      flex: 1;
    }

    .solution-text h3 {
      font-size: 28px;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 16px;
    }

    .solution-text p {
      margin-bottom: 16px;
      color: var(--text-body);
    }

    .solution-text ul {
      list-style: none;
    }

    .solution-text li {
      padding-left: 20px;
      position: relative;
      margin-bottom: 8px;
      color: var(--text-body);
    }

    .solution-text li::before {
      content: '';
      position: absolute;
      left: 0;
      top: 12px;
      width: 8px;
      height: 8px;
      background: var(--brand-primary);
      border-radius: 50%;
    }

    @media (max-width: 768px) {
      .solution-row, .solution-row.reverse {
        flex-direction: column;
      }
    }

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

    .accordion-title {
      font-size: 18px;
      font-weight: 600;
      color: var(--text-dark);
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }

    .accordion-title i {
      transition: transform 0.3s ease;
    }

    .accordion-item.active .accordion-title i {
      transform: rotate(180deg);
    }

    .accordion-content {
      font-size: 16px;
      color: var(--text-body);
      line-height: 1.7;
      padding-bottom: 20px;
      display: none;
    }

    .accordion-item.active .accordion-content {
      display: block;
    }

    /* 联系 CTA */
    .cta-section {
      background: linear-gradient(135deg, #153F32, #1B4D3E);
      padding: 100px 0;
      text-align: center;
    }

    .cta-section h2 {
      color: #fff;
      margin-bottom: 16px;
    }

    .cta-section p {
      color: rgba(255,255,255,0.85);
      font-size: 18px;
      margin-bottom: 32px;
    }

    .cta-form {
      display: flex;
      gap: 12px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .cta-form input {
      background: #fff;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-btn);
      padding: 14px 16px;
      font-size: 16px;
      min-width: 280px;
      transition: border 0.2s, box-shadow 0.2s;
    }

    .cta-form input:focus {
      outline: none;
      border-color: var(--brand-primary);
      box-shadow: 0 0 0 3px rgba(27,77,62,0.2);
    }

    /* 页脚 */
    .site-footer {
      background: #0B1E1A;
      padding: 60px 0 0;
      color: #9BA8A4;
    }

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

    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 12px;
    }

    .footer-desc {
      font-size: 14px;
      line-height: 1.6;
    }

    .footer-col h4 {
      color: #fff;
      font-size: 16px;
      margin-bottom: 16px;
    }

    .footer-col a {
      display: block;
      font-size: 14px;
      margin-bottom: 8px;
      color: #9BA8A4;
    }

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

    .social-icons i {
      font-size: 20px;
      margin-right: 16px;
      color: #9BA8A4;
      transition: color 0.2s;
    }

    .social-icons i:hover {
      color: var(--brand-accent);
    }

    .copyright {
      text-align: center;
      padding: 24px 0;
      border-top: 1px solid rgba(255,255,255,0.08);
      font-size: 14px;
      color: #7A8B86;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 480px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 滚动入场动画 */
    .fade-up {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }