/* ===== CSS Variables ===== */
    :root {
      --primary: #2563eb;
      --primary-dark: #1d4ed8;
      --primary-light: #dbeafe;
      --primary-50: #eff6ff;
      --secondary: #0ea5e9;
      --accent: #f59e0b;
      --accent-light: #fef3c7;
      --text: #0f172a;
      --text-secondary: #475569;
      --text-light: #94a3b8;
      --bg: #ffffff;
      --bg-light: #f8fafc;
      --bg-gray: #f1f5f9;
      --border: #e2e8f0;
      --radius: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
      --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
      --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
      --max-w: 1200px;
      --transition: 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text);
      background: var(--bg);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    a:hover {
      color: var(--primary-dark);
    }

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

    ul,
    ol {
      list-style: none;
    }

    .container {
      max-width: var(--max-w);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ===== Header ===== */
    .site-header {
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      position: sticky;
      top: 0;
      z-index: 100;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: var(--max-w);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 10px;
      letter-spacing: -0.5px;
    }

    .logo svg {
      width: 32px;
      height: 32px;
    }

    .logo span {
      color: var(--text);
    }

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

    .nav-links a {
      color: var(--text-secondary);
      font-size: 15px;
      font-weight: 500;
      position: relative;
      transition: color var(--transition);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      right: 0;
      height: 2.5px;
      background: var(--primary);
      border-radius: 2px;
    }

    .nav-cta {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff !important;
      padding: 10px 24px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
      transition: all var(--transition);
    }

    .nav-cta:hover {
      transform: translateY(-1px);
      box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4);
      color: #fff !important;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text);
    }

    /* ===== Hero ===== */
    .hero {
      padding: 80px 0 60px;
      background: linear-gradient(165deg, #eff6ff 0%, #dbeafe 40%, #e0f2fe 70%, #f0f9ff 100%);
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: -50%;
      right: -20%;
      width: 800px;
      height: 800px;
      background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
      border-radius: 50%;
    }

    .hero::after {
      content: '';
      position: absolute;
      bottom: -30%;
      left: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(14, 165, 233, 0.06) 0%, transparent 70%);
      border-radius: 50%;
    }

    .hero .container {
      position: relative;
      z-index: 1;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 20px;
      color: var(--text);
      letter-spacing: -1px;
    }

    .hero h1 em {
      font-style: normal;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero .subtitle {
      font-size: 20px;
      color: var(--text-secondary);
      max-width: 600px;
      margin-bottom: 12px;
      font-weight: 400;
    }

    .hero .tagline {
      font-size: 16px;
      color: var(--text-light);
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 14px 32px;
      border-radius: 10px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      border: none;
      transition: all var(--transition);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #fff;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
      color: #fff;
    }

    .btn-outline {
      background: #fff;
      color: var(--primary);
      border: 2px solid var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary-50);
      border-color: var(--primary-dark);
    }

    /* Stats Bar */
    .stats-bar {
      display: flex;
      gap: 0;
      background: #fff;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-lg);
      overflow: hidden;
      max-width: 800px;
    }

    .stat-item {
      flex: 1;
      text-align: center;
      padding: 24px 16px;
      border-right: 1px solid var(--border);
      transition: background var(--transition);
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-item:hover {
      background: var(--primary-50);
    }

    .stat-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-light);
      margin-top: 4px;
    }

    /* ===== Section ===== */
    .section {
      padding: 80px 0;
    }

    .section-alt {
      background: var(--bg-light);
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      text-align: center;
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-title em {
      font-style: normal;
      color: var(--primary);
    }

    .section-desc {
      text-align: center;
      color: var(--text-secondary);
      font-size: 17px;
      max-width: 640px;
      margin: 0 auto 48px;
      line-height: 1.7;
    }

    /* ===== Feature Cards ===== */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .feature-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      transition: all var(--transition);
      position: relative;
      overflow: hidden;
    }

    .feature-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      opacity: 0;
      transition: opacity var(--transition);
    }

    .feature-card:hover {
      box-shadow: var(--shadow-xl);
      transform: translateY(-4px);
      border-color: var(--primary-light);
    }

    .feature-card:hover::before {
      opacity: 1;
    }

    .feature-icon {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, var(--primary-light), #e0f2fe);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
    }

    .feature-icon svg {
      width: 26px;
      height: 26px;
      color: var(--primary);
    }

    .feature-card h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text);
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.6;
      margin-bottom: 14px;
    }

    .feature-link {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
    }

    .feature-link:hover {
      gap: 8px;
      color: var(--primary-dark);
    }

    .feature-link svg {
      width: 16px;
      height: 16px;
      transition: transform var(--transition);
    }

    .feature-card:hover .feature-link svg {
      transform: translateX(2px);
    }

    /* ===== Solution Cards ===== */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .solution-card {
      background: #fff;
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }

    .solution-card:hover {
      box-shadow: var(--shadow-xl);
      transform: translateY(-4px);
      border-color: var(--primary-light);
    }

    .solution-icon {
      width: 56px;
      height: 56px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 28px;
    }

    .solution-card h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .solution-card p {
      font-size: 15px;
      color: var(--text-secondary);
      line-height: 1.6;
      margin-bottom: 16px;
      flex: 1;
    }

    .solution-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 15px;
      font-weight: 600;
      color: var(--primary);
    }

    .solution-link:hover {
      gap: 10px;
      color: var(--primary-dark);
    }

    /* ===== Why Section ===== */
    .why-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .why-item {
      text-align: center;
      padding: 24px;
    }

    .why-icon {
      width: 72px;
      height: 72px;
      border-radius: 20px;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 32px;
      background: linear-gradient(135deg, var(--primary-50), #e0f2fe);
    }

    .why-item h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .why-item p {
      font-size: 15px;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    /* ===== CTA Section ===== */
    .cta-section {
      padding: 80px 0;
      background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 40%, #2563eb 100%);
      position: relative;
      overflow: hidden;
    }

    .cta-section::before {
      content: '';
      position: absolute;
      top: -40%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(14, 165, 233, 0.2) 0%, transparent 70%);
      border-radius: 50%;
    }

    .cta-section .container {
      position: relative;
      z-index: 1;
      text-align: center;
    }

    .cta-section h2 {
      font-size: 36px;
      font-weight: 800;
      color: #fff;
      margin-bottom: 16px;
    }

    .cta-section p {
      font-size: 18px;
      color: rgba(255, 255, 255, 0.85);
      margin-bottom: 32px;
      max-width: 500px;
      margin-left: auto;
      margin-right: auto;
    }

    .cta-section .btn {
      background: #fff;
      color: var(--primary);
      padding: 16px 40px;
      font-size: 18px;
      border-radius: 12px;
      box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
    }

    .cta-section .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    }

    /* ===== Footer ===== */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 28px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #fff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .footer-col p {
      font-size: 14px;
      line-height: 1.8;
    }

    .footer-col a {
      display: block;
      color: #94a3b8;
      font-size: 14px;
      padding: 5px 0;
      transition: color var(--transition);
    }

    .footer-col a:hover {
      color: #fff;
      padding-left: 4px;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* ===== Responsive ===== */
    @media (max-width: 1024px) {
      .feature-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .solution-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        gap: 16px;
      }

      .nav-links.show {
        display: flex;
      }

      .mobile-toggle {
        display: block;
      }

      .hero {
        padding: 48px 0 40px;
      }

      .hero h1 {
        font-size: 32px;
      }

      .hero .subtitle {
        font-size: 17px;
      }

      .stats-bar {
        flex-wrap: wrap;
      }

      .stat-item {
        flex: 1 1 50%;
        border-bottom: 1px solid var(--border);
      }

      .section-title {
        font-size: 26px;
      }

      .feature-grid,
      .solution-grid,
      .why-grid {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .cta-section h2 {
        font-size: 28px;
      }
    }

    @media (max-width: 480px) {
      .hero h1 {
        font-size: 26px;
      }

      .hero-actions {
        flex-direction: column;
      }

      .btn {
        width: 100%;
        justify-content: center;
      }

      .stats-bar {
        flex-direction: column;
      }

      .stat-item {
        border-right: none;
        border-bottom: 1px solid var(--border);
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    /* Feature Detail Overrides */
    .feature-hero {
      padding: 60px 0 50px;
      background: linear-gradient(165deg, #eff6ff 0%, #dbeafe 40%, #e0f2fe 70%, #f0f9ff 100%);
      position: relative;
      overflow: hidden;
    }

    .feature-hero::before {
      content: '';
      position: absolute;
      top: -50%;
      right: -20%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
      border-radius: 50%;
    }

    .feature-hero .container {
      position: relative;
      z-index: 1;
    }

    .feature-hero h1 {
      font-size: 40px;
      font-weight: 900;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .feature-hero h1 em {
      font-style: normal;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .feature-hero p {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 650px;
      margin-bottom: 24px;
    }

    .breadcrumb {
      padding: 16px 0;
      font-size: 14px;
      color: var(--text-light);
    }

    .breadcrumb a {
      color: var(--text-light);
    }

    .breadcrumb a:hover {
      color: var(--primary);
    }

    .breadcrumb span {
      margin: 0 8px;
    }

    .faq-list {
      max-width: 760px;
      margin: 0 auto;
    }

    .faq-item {
      border: 1px solid var(--border);
      border-radius: var(--radius);
      margin-bottom: 12px;
      overflow: hidden;
      transition: box-shadow var(--transition);
    }

    .faq-item:hover {
      box-shadow: var(--shadow-md);
    }

    .faq-q {
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: var(--bg-light);
      font-size: 16px;
    }

    .faq-q::after {
      content: '+';
      font-size: 22px;
      color: var(--primary);
      transition: transform var(--transition);
      font-weight: 300;
    }

    .faq-item.open .faq-q::after {
      transform: rotate(45deg);
    }

    .faq-a {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: all 0.3s ease;
      color: var(--text-secondary);
      font-size: 15px;
      line-height: 1.7;
    }

    .faq-item.open .faq-a {
      padding: 18px 24px;
      max-height: 300px;
    }

    .cta-banner {
      background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 40%, #2563eb 100%);
      color: #fff;
      text-align: center;
      padding: 56px 32px;
      border-radius: var(--radius-lg);
      margin: 40px 0;
      position: relative;
      overflow: hidden;
    }

    .cta-banner::before {
      content: '';
      position: absolute;
      top: -40%;
      right: -10%;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(14, 165, 233, 0.2) 0%, transparent 70%);
      border-radius: 50%;
    }

    .cta-banner h2 {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 12px;
      position: relative;
      z-index: 1;
    }

    .cta-banner p {
      opacity: 0.9;
      margin-bottom: 24px;
      font-size: 17px;
      position: relative;
      z-index: 1;
    }

    .cta-banner .btn {
      background: #fff;
      color: var(--primary);
      position: relative;
      z-index: 1;
    }

    .cta-banner .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
    }