/* roulang page: index */
:root {
      --primary: #1E3E3B;
      --primary-soft: #2A4F4B;
      --accent: #C79A63;
      --accent-hover: #B07D4A;
      --accent-light: rgba(199, 154, 99, 0.12);
      --bg-warm: #F7F5F2;
      --white: #FFFFFF;
      --text-dark: #1E2B2A;
      --text-body: #333333;
      --text-muted: #5F6C6A;
      --text-light: #B0B8B6;
      --border-light: #E6E3DE;
      --shadow-card: 0 8px 28px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 16px 36px rgba(0, 0, 0, 0.08);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 8px;
      --font-heading: 'Inter', 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --transition-smooth: 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
      --container-max: 1280px;
      --section-gap: 100px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--white);
      color: var(--text-body);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
      color: var(--text-dark);
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: clamp(2.8rem, 6vw, 3.8rem);
      line-height: 1.2;
      font-weight: 700;
    }

    h2 {
      font-size: clamp(2rem, 4vw, 2.5rem);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }

    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 48px;
      height: 3px;
      background: var(--accent);
      border-radius: 4px;
    }

    h3 {
      font-size: 1.35rem;
      font-weight: 600;
      margin-bottom: 12px;
    }

    p {
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      box-shadow: 0 6px 18px rgba(199, 154, 99, 0.3);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
      box-shadow: 0 10px 24px rgba(176, 125, 74, 0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-size: 1rem;
    }

    .btn-outline:hover {
      background: var(--accent-light);
      transform: translateY(-2px);
    }

    /* 导航 */
    .desktop-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(30, 62, 59, 0.92);
      backdrop-filter: blur(12px);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 100;
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
      transition: background 0.3s;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
      font-family: var(--font-heading);
    }
    .logo span {
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      gap: 32px;
    }

    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
      font-size: 1rem;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent);
    }

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

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

    /* 移动端底部 Tab */
    .mobile-tab-bar {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: white;
      border-top: 1px solid #E6E3DE;
      justify-content: space-around;
      align-items: center;
      z-index: 100;
      box-shadow: 0 -4px 12px rgba(0,0,0,0.04);
      padding: 0 8px;
    }

    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: #8A9795;
      font-size: 0.7rem;
      font-weight: 500;
      transition: color 0.2s;
      gap: 4px;
    }

    .tab-item i {
      font-size: 1.4rem;
    }

    .tab-item.active {
      color: var(--accent);
      font-weight: 600;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, rgba(30,62,59,0.88) 0%, rgba(20,40,37,0.7) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      max-width: 720px;
      margin-top: 40px;
    }

    .hero h1 {
      color: white;
      margin-bottom: 20px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.3);
    }

    .hero .subtitle {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.9);
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .geo-decor {
      position: absolute;
      right: -20px;
      bottom: 40px;
      width: 320px;
      height: 320px;
      border: 2px dashed rgba(199,154,99,0.25);
      border-radius: 50%;
      opacity: 0.5;
    }

    /* 服务板块 交错布局 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 48px;
    }

    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
      display: flex;
      flex-direction: column;
      border: 1px solid var(--border-light);
    }

    .service-card.large {
      grid-column: span 2;
      flex-direction: row;
      gap: 32px;
      align-items: center;
    }

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

    .icon-box {
      width: 64px;
      height: 64px;
      background: var(--accent-light);
      border-radius: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 2rem;
      margin-bottom: 24px;
      transition: 0.2s;
    }

    .service-card:hover .icon-box {
      background: var(--accent);
      color: white;
    }

    .service-card.large .icon-box {
      margin-bottom: 0;
    }

    /* 优势数据带 */
    .advantages-band {
      background: var(--primary);
      padding: 70px 0;
      color: white;
    }

    .stats {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 32px;
    }

    .stat-number {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }

    /* 案例网格 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      margin-top: 48px;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }

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

    .case-img {
      height: 240px;
      background-size: cover;
      background-position: center;
      transition: transform 0.4s;
    }

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

    .case-info {
      padding: 24px;
    }

    .tag {
      background: var(--accent-light);
      color: var(--accent);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      margin-top: 56px;
      position: relative;
    }

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

    .step-circle {
      width: 64px;
      height: 64px;
      background: white;
      border: 2px solid var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-size: 1.8rem;
      color: var(--accent);
      background: var(--accent-light);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 24px 0;
    }

    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-muted);
    }

    .faq-item.open .faq-answer {
      max-height: 160px;
      margin-top: 16px;
    }

    /* CTA */
    .cta-band {
      background: var(--primary);
      padding: 90px 24px;
      text-align: center;
    }

    /* 页脚 */
    .footer {
      background: #1A1A1A;
      color: #B0B8B6;
      padding: 60px 0 30px;
    }

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

    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: 1fr 1fr;
      }
      .service-card.large {
        grid-column: span 2;
      }
      .cases-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-tab-bar {
        display: flex;
      }
      .container {
        padding: 0 20px;
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .service-card.large {
        grid-column: span 1;
        flex-direction: column;
      }
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .process-steps {
        flex-direction: column;
        gap: 32px;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero {
        min-height: 90vh;
        text-align: center;
      }
      .hero-buttons {
        justify-content: center;
      }
    }