/* roulang page: index */
:root {
      --primary-deep: #0B0E14;
      --primary-light: #1A1F2E;
      --accent-purple: #6C3CFA;
      --accent-purple-hover: #7D52FB;
      --accent-green: #00E5A0;
      --accent-gold: #FFB82E;
      --bg-light: #F5F6FA;
      --card-white: #FFFFFF;
      --faq-bg: #F0F1FE;
      --text-main: #1E2330;
      --text-secondary: #5A6170;
      --text-muted: #8E94A0;
      --border-light: #E9EBF0;
      --shadow-sm: 0 2px 12px rgba(11, 14, 20, 0.06);
      --shadow-hover: 0 8px 24px rgba(108, 60, 250, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
      --font-mono: 'DIN Alternate', 'Roboto Mono', 'Menlo', monospace;
      --transition: 0.3s ease;
    }

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

    body {
      font-family: var(--font-title);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

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

    h1, h2, h3 {
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 48px;
    }

    h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
    }

    .section {
      padding: 80px 0;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      transition: box-shadow 0.3s, border-color 0.3s;
    }

    .site-header.scrolled {
      box-shadow: 0 1px 8px rgba(0,0,0,0.06);
      border-bottom-color: var(--border-light);
    }

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

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(135deg, #6C3CFA 0%, #4A2BB3 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .logo-icon {
      font-size: 28px;
      background: none;
      -webkit-text-fill-color: #6C3CFA;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-link {
      font-weight: 500;
      color: var(--text-secondary);
      transition: color 0.2s;
      font-size: 15px;
    }

    .nav-link:hover {
      color: var(--accent-purple);
    }

    .btn-primary {
      background: var(--accent-purple);
      color: white;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(108,60,250,0.25);
    }

    .btn-primary:hover {
      background: var(--accent-purple-hover);
      box-shadow: 0 4px 16px rgba(108,60,250,0.4);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-purple);
      color: var(--accent-purple);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
    }

    .btn-outline:hover {
      background: #F0ECFE;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary-deep);
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0B0E14 0%, #1A1F2E 100%);
      color: white;
      padding: 120px 0 80px;
      position: relative;
      overflow: hidden;
    }

    .hero-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
    }

    .hero-left {
      flex: 1;
    }

    .hero-left h1 {
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
    }

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

    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
      position: relative;
    }

    .hero-image {
      width: 100%;
      max-width: 500px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(108,60,250,0.3);
    }

    .star-particle {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      pointer-events: none;
    }

    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: -40px;
      position: relative;
      z-index: 10;
    }

    .stat-card {
      background: var(--card-white);
      padding: 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 40px;
      font-weight: 700;
      color: var(--primary-deep);
    }

    .stat-label {
      color: var(--text-muted);
      font-size: 14px;
      margin-top: 4px;
    }

    .stat-growth {
      color: var(--accent-green);
      font-weight: 600;
      font-size: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
    }

    /* 服务矩阵 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .service-card {
      background: var(--card-white);
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 20px;
      align-items: flex-start;
      transition: var(--transition);
    }

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

    .service-icon {
      width: 56px;
      height: 56px;
      background: linear-gradient(135deg, #6C3CFA, #4A2BB3);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 24px;
      flex-shrink: 0;
    }

    /* 对比区域 */
    .compare-wrapper {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-top: 40px;
    }

    .compare-left {
      flex: 1;
    }

    .compare-table {
      flex: 1;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .table-row {
      display: flex;
      border-bottom: 1px solid var(--border-light);
    }

    .table-cell {
      flex: 1;
      padding: 16px 20px;
      font-size: 14px;
    }

    .highlight-green {
      background: rgba(0,229,160,0.08);
      font-weight: 600;
      color: #00A87A;
    }

    /* 案例墙 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .testimonial-card {
      background: #FAFBFC;
      border-radius: var(--radius-card);
      padding: 24px;
      border-left: 4px solid var(--accent-purple);
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }

    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ddd;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 28px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: white;
    }

    .faq-answer {
      padding: 0 28px 20px;
      color: var(--text-secondary);
      background: var(--faq-bg);
      display: none;
    }

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

    /* CTA */
    .cta-section {
      background: var(--primary-deep);
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    .footer {
      background: #1A1F2E;
      color: #B0B8C5;
      padding: 60px 0 30px;
    }

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

    @media (max-width: 992px) {
      .service-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .compare-wrapper { flex-direction: column; }
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .hero-container { flex-direction: column; }
      .testimonial-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }