/* ===== 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-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);
      }