/* roulang page: index */
:root {
      --primary-deep: #0A1128;
      --accent-cyan: #00F0FF;
      --dark-cobalt: #1A2B4C;
      --passion-pink: #FF3366;
      --bg-light: #F8FAFC;
      --text-body: #1E293B;
      --text-muted: #64748B;
      --border-light: #E2E8F0;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(10, 17, 40, 0.06);
      --shadow-hover: 0 12px 30px rgba(10, 17, 40, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-default: all 0.3s ease;
    }

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

    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航样式 */
    .main-header {
      background-color: var(--white);
      border-bottom: 1px solid var(--border-light);
      position: sticky;
      top: 0;
      z-index: 50;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--primary-deep);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      color: var(--accent-cyan);
      width: 32px;
      height: 32px;
    }

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

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

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

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

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--accent-cyan);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-btn {
      width: 40px;
      height: 40px;
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-muted);
      background: var(--bg-light);
      transition: var(--transition-default);
    }

    .search-btn:hover {
      background: #e9eef3;
      color: var(--primary-deep);
    }

    .btn-primary {
      background-color: var(--accent-cyan);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      transition: var(--transition-default);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
      border: 1px solid transparent;
    }

    .btn-primary:hover {
      background-color: #00e0ef;
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.6);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      transition: var(--transition-default);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.08);
      border-color: #00e0ef;
      color: #00e0ef;
    }

    /* 移动端导航 */
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--primary-deep);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--primary-deep);
      padding: 24px;
      flex-direction: column;
      gap: 20px;
      z-index: 40;
    }

    .mobile-menu a {
      color: white;
      font-size: 18px;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      padding-bottom: 12px;
    }

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

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-left {
      flex: 0 0 55%;
    }

    .hero-right {
      flex: 0 0 45%;
      position: relative;
    }

    .hero-right img {
      border-radius: 24px;
      box-shadow: 0 25px 50px rgba(10, 17, 40, 0.15);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .hero-right::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(0,240,255,0.1) 0%, rgba(10,17,40,0.2) 100%);
      border-radius: 24px;
      pointer-events: none;
    }

    h1 {
      font-size: 48px;
      line-height: 1.1;
      font-weight: 800;
      color: var(--primary-deep);
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
    }

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

    /* 通用板块 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }

    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition-default);
      padding: 32px;
      height: 100%;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .icon-circle {
      width: 48px;
      height: 48px;
      color: var(--accent-cyan);
      margin-bottom: 24px;
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .stats-row {
      display: flex;
      gap: 60px;
      align-items: center;
    }

    .big-number {
      font-size: 64px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--accent-cyan), #0ea5e9);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      border-radius: 8px;
      transition: transform 0.3s;
    }

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

    .tag {
      background: var(--passion-pink);
      color: white;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 12px;
      font-weight: 600;
      display: inline-block;
    }

    .steps-container {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }

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

    .step-number {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--dark-cobalt);
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px;
      font-size: 20px;
    }

    .step-item.active .step-number {
      background: var(--accent-cyan);
      color: var(--primary-deep);
    }

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

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--primary-deep);
    }

    .faq-answer {
      color: var(--text-muted);
      margin-top: 12px;
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    .cta-banner {
      background: var(--primary-deep);
      position: relative;
      overflow: hidden;
      padding: 80px 24px;
      text-align: center;
    }

    .cta-banner::before {
      content: '';
      position: absolute;
      top: -30%;
      left: -10%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, var(--accent-cyan) 0%, rgba(255,51,102,0.2) 70%);
      filter: blur(80px);
      opacity: 0.25;
    }

    .footer {
      background: var(--primary-deep);
      color: #CBD5E1;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        flex: 0 0 100%;
      }
      .service-grid, .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      .section-title { font-size: 26px; }
      .nav-links, .header-actions .btn-primary {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .service-grid, .case-grid {
        grid-template-columns: 1fr;
      }
      .stats-row {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .steps-container {
        flex-direction: column;
        gap: 32px;
      }
      .section {
        padding: 60px 0;
      }
    }