/* roulang page: index */
/* :root 设计变量 */
    :root {
      --primary: #E9405C;
      --primary-dark: #C72A48;
      --secondary: #1A1D2E;
      --accent: #00E5A0;
      --bg-light: #F8F9FC;
      --card-bg: #FFFFFF;
      --text-primary: #1A1D2E;
      --text-body: #4A4E5C;
      --text-muted: #8A8D9C;
      --border-light: #E8EAF0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-card: 0 2px 16px rgba(26,29,46,0.06);
      --shadow-hover: 0 8px 32px rgba(233,64,92,0.12);
      --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-en: "Inter", "SF Pro Display", system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-cn);
      color: var(--text-body);
      background-color: #fff;
      line-height: 1.75;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .button {
      cursor: pointer;
      font-family: var(--font-cn);
    }

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

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

    /* 导航栏 */
    .site-header {
      background: #fff;
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 100;
      height: 64px;
      display: flex;
      align-items: center;
      padding: 0 20px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo-area {
      display: flex;
      align-items: baseline;
      gap: 6px;
      font-weight: 800;
      font-size: 1.6rem;
      color: var(--secondary);
      letter-spacing: -0.5px;
    }

    .logo-area small {
      font-size: 0.8rem;
      font-weight: 400;
      color: var(--text-muted);
      letter-spacing: 0;
    }

    .chip-nav {
      display: flex;
      gap: 10px;
      list-style: none;
      margin: 0;
    }

    .chip-nav a {
      display: inline-block;
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-body);
      transition: all 0.2s ease;
      background: transparent;
    }

    .chip-nav a.active,
    .chip-nav a:hover {
      background: var(--primary);
      color: #fff;
    }

    .chip-nav a:not(.active):hover {
      background: #F0F1F5;
      color: var(--secondary);
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      border: none;
      transition: all 0.25s ease;
      display: inline-block;
      font-size: 0.9rem;
      box-shadow: 0 4px 10px rgba(233,64,92,0.25);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(233,64,92,0.3);
      color: #fff;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-block;
      font-size: 0.9rem;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: #fff;
      transform: translateY(-2px);
    }

    .btn-white-outline {
      border: 2px solid #fff;
      color: #fff;
      background: transparent;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.25s ease;
    }

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

    /* 移动端汉堡菜单 */
    @media (max-width: 1024px) {
      .desktop-nav {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
    }

    @media (min-width: 1025px) {
      .mobile-toggle, .mobile-menu {
        display: none;
      }
    }

    /* Hero */
    .hero {
      background: var(--bg-light);
      position: relative;
      overflow: hidden;
      padding: 80px 0;
    }

    .hero::before {
      content: "";
      position: absolute;
      left: -80px;
      top: -40px;
      width: 350px;
      height: 350px;
      background: rgba(233,64,92,0.08);
      transform: skew(-12deg);
      border-radius: 40px;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 50px;
      position: relative;
      z-index: 2;
    }

    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--secondary);
      margin-bottom: 20px;
      line-height: 1.2;
    }

    .hero-text p {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 28px;
    }

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

    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-hover);
      max-width: 520px;
    }

    /* Section 通用 */
    .section {
      padding: 80px 0;
    }

    .section h2 {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 32px;
      text-align: center;
      color: var(--secondary);
      letter-spacing: -0.02em;
    }

    .card-grid {
      display: grid;
      gap: 24px;
    }

    .grid-3 {
      grid-template-columns: repeat(3, 1fr);
    }
    .grid-4 {
      grid-template-columns: repeat(4, 1fr);
    }
    .grid-2 {
      grid-template-columns: repeat(2, 1fr);
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      text-align: center;
    }

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

    .service-card i {
      font-size: 2.5rem;
      color: var(--primary);
      margin-bottom: 18px;
    }

    .service-card h3 {
      font-size: 1.25rem;
      margin-bottom: 12px;
    }

    .stat-item {
      text-align: center;
      padding: 20px;
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      font-family: var(--font-en);
    }

    .stat-divider {
      width: 40px;
      height: 1px;
      background: var(--border-light);
      margin: 12px auto;
    }

    .stat-label {
      color: var(--text-body);
      font-weight: 500;
    }

    .case-card {
      background: #fff;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.2s;
    }

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

    .case-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
    }

    .case-tag {
      background: var(--accent);
      color: #1A1D2E;
      font-weight: 600;
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin: 16px 16px 8px;
    }

    .case-card h3 {
      margin: 0 16px 8px;
      font-size: 1.2rem;
    }

    .case-card p {
      margin: 0 16px 16px;
      color: var(--text-muted);
    }

    .steps {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

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

    .step-icon {
      width: 56px;
      height: 56px;
      background: #F0F1F5;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--secondary);
    }

    .step.active .step-icon {
      background: var(--primary);
      color: #fff;
    }

    .accordion-title {
      font-weight: 600;
      font-size: 1rem;
      border-radius: 8px !important;
      background: #fff;
      border: 1px solid var(--border-light);
      transition: 0.2s;
    }

    .accordion-title:hover {
      background: #f9f9fc;
    }

    .accordion-item.is-active .accordion-title {
      color: var(--primary);
      border-color: var(--primary);
    }

    .accordion-content {
      background: #FAFAFC;
      padding: 16px;
      border-radius: 0 0 8px 8px;
    }

    .cta-banner {
      background: linear-gradient(135deg, #E9405C 0%, #C72A48 100%);
      padding: 70px 20px;
      text-align: center;
      color: #fff;
    }

    .footer {
      background: var(--secondary);
      color: var(--text-muted);
      padding: 50px 0 20px;
    }

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

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
    }

    .copyright {
      border-top: 1px solid #2d3142;
      margin-top: 30px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
    }

    @media (max-width: 1024px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 640px) {
      h1 {
        font-size: 2.2rem !important;
      }
      .grid-3, .grid-4, .grid-2 {
        grid-template-columns: 1fr;
      }
      .steps {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }