/* roulang page: index */
/* 全局设计变量与基础重置 */
    :root {
      --bg-deep: #0B0A1A;
      --bg-section: #131129;
      --bg-card: rgba(26, 23, 53, 0.8);
      --border-card: rgba(168, 85, 247, 0.15);
      --border-hover: rgba(168, 85, 247, 0.6);
      --primary-purple: #A855F7;
      --primary-purple-hover: #9333EA;
      --accent-cyan: #22D3EE;
      --text-body: #E2E0F0;
      --text-heading: #FFFFFF;
      --text-muted: #9CA3AF;
      --radius-card: 16px;
      --radius-btn: 50px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-hover: 0 16px 40px rgba(168,85,247,0.2);
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'Inter', -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      background: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      letter-spacing: 0.01em;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      color: var(--text-heading);
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-top: 0;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    section {
      padding: 120px 0;
    }
    @media (max-width: 1024px) {
      section {
        padding: 80px 0;
      }
    }
    /* 固定导航栏 - 暗色霓虹风格 */
    .ng-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 10, 26, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid transparent;
      background-image: linear-gradient(rgba(11,10,26,0.85), rgba(11,10,26,0.85)), linear-gradient(90deg, #A855F7, #22D3EE);
      background-origin: border-box;
      background-clip: padding-box, border-box;
      z-index: 100;
      display: flex;
      align-items: center;
      padding: 0 20px;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--accent-cyan);
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
      margin: 0;
    }
    .nav-links a {
      color: var(--text-body);
      font-weight: 500;
      padding: 8px 0;
      position: relative;
      font-size: 0.95rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary-purple);
      box-shadow: 0 0 8px var(--primary-purple);
      transition: width 0.25s;
    }
    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--primary-purple);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: var(--transition);
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: var(--primary-purple-hover);
      box-shadow: 0 0 20px rgba(168,85,247,0.5);
      color: white;
    }
    /* 移动端汉堡菜单 */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 2px;
      background: var(--accent-cyan);
      transition: var(--transition);
    }
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(11,10,26,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        gap: 1.5rem;
        border-bottom: 1px solid var(--primary-purple);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .nav-cta.desktop {
        display: none;
      }
    }
    @media (min-width: 1025px) {
      .hamburger {
        display: none;
      }
    }
    /* 按钮全局 */
    .btn-primary {
      background: var(--primary-purple);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      display: inline-block;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-purple-hover);
      box-shadow: 0 0 20px rgba(168,85,247,0.5);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      display: inline-block;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: rgba(34,211,238,0.1);
      color: var(--accent-cyan);
    }
    /* Hero区域 */
    #hero {
      height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1A1735, #0B0A1A 70%);
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 500px;
    }
    .hero-left h1 {
      font-size: 3.8rem;
      font-weight: 800;
      margin-bottom: 1.2rem;
      line-height: 1.2;
      color: white;
    }
    .hero-left .subtitle {
      font-size: 1.25rem;
      color: var(--text-body);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .hero-right {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
      position: relative;
    }
    .hero-visual {
      width: 100%;
      max-width: 450px;
      aspect-ratio: 1/1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      opacity: 0.9;
      box-shadow: 0 0 40px rgba(168,85,247,0.25);
      mask-image: radial-gradient(circle, rgba(0,0,0,1) 60%, rgba(0,0,0,0) 100%);
    }
    @media (max-width: 768px) {
      .hero-left h1 {
        font-size: 2.5rem;
      }
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-right {
        margin-top: 2rem;
      }
    }
    /* 服务卡片 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 2.5rem;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-card);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      transition: var(--transition);
      box-shadow: var(--shadow-card);
      backdrop-filter: blur(8px);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      border-color: var(--border-hover);
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--accent-cyan);
      margin-bottom: 1.2rem;
    }
    .service-card h3 {
      font-size: 1.4rem;
      margin-bottom: 0.8rem;
    }
    @media (max-width: 1024px) {
      .card-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .card-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 优势数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
      margin-top: 2rem;
    }
    .stat-item {
      background: rgba(26,23,53,0.5);
      border-radius: var(--radius-card);
      padding: 2rem 1rem;
      border: 1px solid var(--border-card);
      transition: var(--transition);
    }
    .stat-number {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--accent-cyan);
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
      margin-top: 2rem;
    }
    .case-card {
      display: flex;
      background: var(--bg-card);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid var(--border-card);
      transition: var(--transition);
    }
    .case-img {
      width: 45%;
      background-size: cover;
      background-position: center;
      min-height: 200px;
    }
    .case-content {
      padding: 1.5rem;
      width: 55%;
    }
    .tag {
      background: var(--primary-purple);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      display: inline-block;
      margin-bottom: 0.8rem;
    }
    @media (max-width: 768px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
      .case-card {
        flex-direction: column;
      }
      .case-img {
        width: 100%;
        height: 180px;
      }
      .case-content {
        width: 100%;
      }
    }
    /* 解决方案图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
      flex-wrap: wrap;
    }
    .solution-img {
      flex: 1 1 45%;
      background: #1A1735;
      border-radius: var(--radius-card);
      height: 260px;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--border-card);
    }
    .solution-text {
      flex: 1 1 45%;
    }
    .step-num {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent-cyan);
    }
    /* FAQ手风琴定制 */
    .accordion {
      background: transparent;
      border: none;
    }
    .accordion-item {
      background: #1A1735;
      border-radius: 12px;
      margin-bottom: 1rem;
      border: 1px solid var(--border-card);
    }
    .accordion-title {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--accent-cyan);
      padding: 1.2rem 1.5rem;
      background: transparent;
      border: none;
    }
    .accordion-content {
      background: #221F45;
      color: var(--text-body);
      padding: 1rem 1.5rem 1.5rem;
      border-top: 1px solid var(--border-card);
    }
    /* CTA横幅 */
    .cta-banner {
      background: #0B0A1A;
      background-image: radial-gradient(circle at 50% 50%, #2D1B4E, #0B0A1A);
      padding: 100px 20px;
      text-align: center;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
      padding: 60px 0 40px;
    }
    .footer-col h4 {
      color: var(--accent-cyan);
      margin-bottom: 1.2rem;
    }
    .footer-links a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 0.6rem;
    }
    .copyright {
      border-top: 1px solid rgba(168,85,247,0.2);
      padding: 20px 0;
      text-align: center;
      color: var(--text-muted);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }