/* roulang page: index */
:root {
      --deep-space: #1A0F3C;
      --electric-purple: #6C3CE1;
      --star-gold: #F5A623;
      --bg-light: #F9F7FE;
      --text-primary: #1E1E2A;
      --text-secondary: #4A4A60;
      --white: #FFFFFF;
      --card-shadow: 0 4px 20px rgba(108, 60, 225, 0.08);
      --card-shadow-hover: 0 8px 30px rgba(108, 60, 225, 0.15);
      --border-light: #E8E4F0;
      --glass-bg: rgba(13, 11, 30, 0.92);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: all 0.3s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background-color: var(--white);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      font-weight: 600;
      letter-spacing: -0.3px;
    }

    h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 36px;
      line-height: 1.3;
    }

    h3 {
      font-size: 22px;
      line-height: 1.4;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--glass-bg);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

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

    .logo {
      font-size: 24px;
      font-weight: 700;
      background: linear-gradient(135deg, #6C3CE1 0%, #F5A623 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      background: none;
      -webkit-text-fill-color: var(--star-gold);
      font-size: 26px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      color: white;
      font-size: 14px;
      font-weight: 500;
      position: relative;
      padding: 4px 0;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--star-gold);
      transition: width 0.3s ease;
    }

    .nav-link:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: linear-gradient(135deg, #6C3CE1 0%, #8B5CF6 100%);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-size: 14px;
      box-shadow: 0 4px 12px rgba(108,60,225,0.3);
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(108,60,225,0.4);
    }

    .btn-outline-light {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline-light:hover {
      background: rgba(255,255,255,0.15);
      border-color: var(--star-gold);
      color: var(--star-gold);
    }

    .btn-gold {
      background: var(--star-gold);
      color: var(--deep-space);
      padding: 14px 32px;
      font-weight: 700;
      border-radius: var(--radius-btn);
      box-shadow: 0 4px 15px rgba(245,166,35,0.4);
    }
    .btn-gold:hover {
      filter: brightness(1.1);
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(245,166,35,0.5);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--deep-space);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
      }
      .nav-menu.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      background: linear-gradient(135deg, #0D0B1E 0%, #1A0F3C 50%, #2D1B69 100%);
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }
    .hero::before {
      content: "";
      position: absolute;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(108,60,225,0.3) 0%, transparent 70%);
      top: -100px;
      right: -100px;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
    }
    .hero h1 {
      color: white;
      margin-bottom: 20px;
    }
    .hero .highlight {
      color: var(--star-gold);
    }
    .hero p {
      font-size: 18px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    section {
      padding: 100px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      color: var(--deep-space);
      margin-bottom: 12px;
    }
    .section-title p {
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      text-align: left;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .service-icon {
      font-size: 40px;
      color: var(--electric-purple);
      margin-bottom: 20px;
    }
    .service-card h3 {
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 16px;
    }
    .text-link {
      color: var(--electric-purple);
      font-weight: 600;
      font-size: 14px;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 24px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--star-gold);
      line-height: 1.1;
    }
    .stat-label {
      color: var(--text-secondary);
      margin-top: 8px;
    }

    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    .case-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
    }
    .case-info {
      padding: 20px;
    }
    .case-tag {
      background: rgba(108,60,225,0.1);
      color: var(--electric-purple);
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }

    .timeline {
      display: flex;
      flex-direction: column;
      gap: 32px;
      position: relative;
    }
    .timeline::before {
      content: '';
      position: absolute;
      left: 24px;
      top: 0;
      bottom: 0;
      width: 2px;
      background: linear-gradient(to bottom, var(--electric-purple), transparent);
    }
    .step {
      display: flex;
      gap: 32px;
      align-items: flex-start;
    }
    .step-num {
      width: 48px;
      height: 48px;
      background: var(--electric-purple);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      z-index: 2;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      padding-top: 0;
    }
    .faq-answer.open {
      max-height: 200px;
      padding-top: 12px;
    }

    .cta-band {
      background: var(--electric-purple);
      text-align: center;
      padding: 80px 0;
      color: white;
    }
    .footer {
      background: var(--deep-space);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a:hover {
      color: var(--star-gold);
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,0.1);
      font-size: 13px;
    }

    @media (max-width: 1024px) {
      .grid-3, .case-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      h1 { font-size: 40px; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 28px; }
      .grid-3, .case-grid, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      section { padding: 60px 0; }
    }