/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --deep-space-light: #1A1F3A;
      --gold-orange: #F5A623;
      --electric-cyan: #00F0FF;
      --white-soft: rgba(255,255,255,0.92);
      --white-muted: rgba(255,255,255,0.7);
      --white-dim: rgba(255,255,255,0.4);
      --card-bg: rgba(255,255,255,0.04);
      --border-glow: rgba(245,166,35,0.2);
      --border-cyan: rgba(0,240,255,0.25);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-cyan: 0 8px 32px rgba(0,240,255,0.12);
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      background-color: var(--deep-space);
      color: #fff;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .button {
      cursor: pointer;
      font-family: inherit;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
    }
    h1, h2, h3, h4, h5 {
      margin: 0;
      font-weight: 700;
      line-height: 1.3;
    }
    h2 {
      font-size: 2.25rem;
      margin-bottom: 2rem;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background: var(--electric-cyan);
      border-radius: 2px;
    }
    /* 导航 */
    .top-bar {
      background: rgba(10,14,39,0.92);
      backdrop-filter: blur(12px);
      padding: 0.5rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
      position: fixed;
      width: 100%;
      z-index: 99;
      top: 0;
    }
    .top-bar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: #fff;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .logo i {
      color: var(--electric-cyan);
      font-size: 2rem;
    }
    .logo span {
      background: linear-gradient(135deg, #fff 0%, #ddd 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: rgba(255,255,255,0.8);
      font-weight: 500;
      position: relative;
      padding: 0.5rem 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--gold-orange);
    }
    .mega-trigger {
      position: relative;
    }
    .mega-panel {
      position: absolute;
      top: 60px;
      right: 0;
      background: rgba(10,14,39,0.96);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-cyan);
      border-radius: var(--radius-md);
      padding: 1.5rem;
      display: none;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
      width: 580px;
      z-index: 100;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }
    .mega-trigger:hover .mega-panel {
      display: grid;
    }
    .mega-item {
      background: rgba(255,255,255,0.03);
      padding: 1rem;
      border-radius: var(--radius-sm);
      transition: background 0.2s;
    }
    .mega-item:hover {
      background: rgba(0,240,255,0.08);
    }
    .mega-item i {
      color: var(--electric-cyan);
      font-size: 1.5rem;
      margin-bottom: 0.5rem;
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: #fff;
      cursor: pointer;
    }
    [data-responsive-toggle] {
      display: none;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        background: #0A0E27;
        position: absolute;
        top: 65px;
        left: 0;
        width: 100%;
        padding: 1rem;
        gap: 1rem;
        border-bottom: 1px solid var(--border-cyan);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .mega-panel {
        position: static;
        width: 100%;
        grid-template-columns: 1fr;
      }
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      margin-top: 70px;
      border-bottom: 1px solid rgba(0,240,255,0.2);
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, transparent 10%, #0A0E27 95%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      background: linear-gradient(to right, #F5A623, #00F0FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
    }
    .hero p {
      font-size: 1.25rem;
      color: rgba(255,255,255,0.7);
      margin: 1.5rem 0 2rem;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--gold-orange);
      color: #0A0E27;
      padding: 0.9rem 2.2rem;
      font-weight: 700;
    }
    .btn-primary:hover {
      background: var(--electric-cyan);
      color: #0A0E27;
      box-shadow: 0 0 18px var(--electric-cyan);
    }
    .btn-outline {
      border: 1.5px solid rgba(255,255,255,0.6);
      background: transparent;
      color: #fff;
      padding: 0.9rem 2.2rem;
    }
    .btn-outline:hover {
      border-color: #fff;
      background: rgba(255,255,255,0.08);
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.4rem;
      }
    }
    section {
      padding: 5rem 0;
    }
    /* 服务卡片 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.8rem;
    }
    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      padding: 2rem 1.5rem;
      transition: all var(--transition);
    }
    .service-card:hover {
      border-color: var(--electric-cyan);
      background: rgba(0,240,255,0.05);
      box-shadow: var(--shadow-cyan);
    }
    .service-card i {
      font-size: 2.5rem;
      color: var(--electric-cyan);
      margin-bottom: 1.2rem;
    }
    .service-card h3 {
      font-size: 1.4rem;
      margin-bottom: 0.8rem;
    }
    .service-card p {
      color: var(--white-muted);
      font-size: 0.95rem;
    }
    .service-link {
      color: var(--gold-orange);
      margin-top: 1rem;
      display: inline-block;
    }
    @media (max-width: 1024px) {
      .service-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .service-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据带 */
    .stats-strip {
      background: #0A0E27;
      background-image: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.05) 0%, transparent 30%);
      padding: 3rem 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 2rem;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--electric-cyan);
    }
    .stat-label {
      color: var(--gold-orange);
      font-weight: 600;
      margin-top: 0.5rem;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 案例 */
    .case-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .case-row.reverse {
      flex-direction: row-reverse;
    }
    .case-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-glow);
    }
    .case-text {
      flex: 1;
    }
    .case-text h3 {
      font-size: 1.8rem;
      color: #fff;
    }
    .tags {
      display: flex;
      gap: 0.8rem;
      margin: 1rem 0;
    }
    .tag {
      background: rgba(0,240,255,0.15);
      color: var(--electric-cyan);
      padding: 0.2rem 1rem;
      border-radius: 20px;
      font-size: 0.8rem;
    }
    @media (max-width: 768px) {
      .case-row, .case-row.reverse {
        flex-direction: column;
      }
    }
    /* 流程 */
    .steps {
      position: relative;
      padding-left: 30px;
      border-left: 2px solid var(--electric-cyan);
    }
    .step {
      margin-bottom: 2.5rem;
      position: relative;
    }
    .step-num {
      background: var(--gold-orange);
      color: #0A0E27;
      width: 36px;
      height: 36px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      position: absolute;
      left: -49px;
      background: var(--gold-orange);
    }
    /* FAQ */
    .faq-section {
      background: #F8F9FC;
      color: #1A1F3A;
    }
    .faq-section h2 {
      color: #1A1F3A;
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem 2rem;
    }
    .accordion-item {
      border-bottom: 1px solid #ddd;
      padding: 1rem 0;
    }
    .accordion-title {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .accordion-content {
      display: none;
      padding-top: 0.8rem;
      color: #333;
    }
    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }
    /* CTA */
    .cta-banner {
      background: #0A0E27;
      text-align: center;
      padding: 4rem 1rem;
      position: relative;
    }
    .cta-banner h2 {
      color: #fff;
      font-size: 2.2rem;
    }
    .btn-large {
      background: var(--gold-orange);
      color: #000;
      padding: 1rem 3rem;
      font-size: 1.3rem;
      margin-top: 1.5rem;
    }
    .btn-large:hover {
      background: var(--electric-cyan);
      box-shadow: 0 0 25px var(--electric-cyan);
    }
    footer {
      background: #0A0E27;
      padding: 3rem 0 1.5rem;
      border-top: 1px solid rgba(255,255,255,0.1);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    .footer-links a {
      display: block;
      color: rgba(255,255,255,0.65);
      margin-bottom: 0.5rem;
    }
    .footer-links a:hover {
      color: var(--gold-orange);
    }
    .copyright {
      text-align: center;
      margin-top: 2rem;
      color: rgba(255,255,255,0.5);
    }
    input[type="email"] {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(255,255,255,0.2);
      padding: 0.7rem;
      border-radius: var(--radius-sm);
    }