:root {
     --primary-color: #2563eb;
     --secondary-color: #1e40af;
     --accent-color: #3b82f6;
     --dark-color: #1e293b;
     --light-gray: #f8fafc;
     --medium-gray: #64748b;
     --white: #ffffff;
     --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
     --shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
 }

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

 body {
     font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
     color: var(--dark-color);
     line-height: 1.6;
     background-color: var(--light-gray);
 }

 .container {
     max-width: 1200px;
     margin: 0 auto;
     padding: 0 20px;
 }

 /* Header */
 header {
     background: var(--white);
     box-shadow: var(--shadow);
     position: sticky;
     top: 0;
     z-index: 100;
 }

 nav {
     display: flex;
     justify-content: space-between;
     align-items: center;
     padding: 1rem 20px;
 }

 .logo {
     font-size: 1.8rem;
     font-weight: bold;
     background: var(--gradient);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
     text-decoration: none;
 }

 .nav-links {
     display: flex;
     list-style: none;
     gap: 2rem;
 }

 .nav-links a {
     color: var(--dark-color);
     text-decoration: none;
     font-weight: 500;
     transition: color 0.3s;
 }

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

 .cta-header {
     background: var(--primary-color);
     color: var(--white);
     padding: 0.7rem 1.5rem;
     border-radius: 8px;
     text-decoration: none;
     font-weight: 600;
     transition: all 0.3s;
 }

 .cta-header:hover {
     background: var(--secondary-color);
     transform: translateY(-2px);
 }

 .menu-toggle {
     display: none;
     flex-direction: column;
     gap: 5px;
     cursor: pointer;
 }

 .menu-toggle span {
     width: 25px;
     height: 3px;
     background: var(--dark-color);
     border-radius: 2px;
 }

 /* Clients Section */
 .clients-section {
     padding: 4rem 0;
 }

 .section-header {
     text-align: center;
     margin-bottom: 3rem;
 }

 .section-header h1 {
     font-size: 2.5rem;
     margin-bottom: 1rem;
     background: var(--gradient);
     -webkit-background-clip: text;
     -webkit-text-fill-color: transparent;
 }

 .section-header p {
     color: var(--medium-gray);
     font-size: 1.1rem;
 }

 /* Filters */
 .filters {
     background: var(--white);
     padding: 2rem;
     border-radius: 12px;
     box-shadow: var(--shadow);
     margin-bottom: 3rem;
 }

 .filters-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
     gap: 1.5rem;
 }

 .filter-group {
     display: flex;
     flex-direction: column;
     gap: 0.5rem;
 }

 .filter-group label {
     font-weight: 600;
     color: var(--dark-color);
     font-size: 0.9rem;
 }

 .filter-group select {
     padding: 0.8rem;
     border: 2px solid #e2e8f0;
     border-radius: 8px;
     font-size: 1rem;
     color: var(--dark-color);
     background: var(--white);
     cursor: pointer;
     transition: all 0.3s;
 }

 .filter-group select:focus {
     outline: none;
     border-color: var(--primary-color);
 }

 .filter-actions {
     display: flex;
     gap: 1rem;
     margin-top: 1rem;
 }

 .btn-filter {
     padding: 0.8rem 2rem;
     border: none;
     border-radius: 8px;
     font-weight: 600;
     cursor: pointer;
     transition: all 0.3s;
     font-size: 1rem;
 }

 .btn-primary {
     background: var(--primary-color);
     color: var(--white);
 }

 .btn-primary:hover {
     background: var(--secondary-color);
     transform: translateY(-2px);
 }

 .btn-secondary {
     background: transparent;
     color: var(--medium-gray);
     border: 2px solid #e2e8f0;
 }

 .btn-secondary:hover {
     border-color: var(--primary-color);
     color: var(--primary-color);
 }

 /* Accordion */
 .clients-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
     gap: 1.5rem;
 }

 .client-card {
     background: var(--white);
     border-radius: 12px;
     overflow: hidden;
     box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
     transition: all 0.3s;
     cursor: pointer;
 }

 .client-card:hover {
     transform: translateY(-5px);
     box-shadow: var(--shadow);
 }

 .client-header {
     padding: 1.5rem;
     background: var(--gradient);
     color: var(--white);
     display: flex;
     justify-content: space-between;
     align-items: center;
 }

 .client-header h3 {
     font-size: 1.3rem;
 }

 .client-industry {
     font-size: 0.8rem;
     background: rgba(255, 255, 255, 0.2);
     padding: 0.3rem 0.8rem;
     border-radius: 20px;
 }

 .client-body {
     max-height: 0;
     overflow: hidden;
     transition: max-height 0.4s ease;
 }

 .client-body.active {
     max-height: 500px;
 }

 .client-content {
     padding: 1.5rem;
 }

 .client-description {
     color: var(--medium-gray);
     margin-bottom: 1rem;
     line-height: 1.8;
 }

 .client-meta {
     display: flex;
     gap: 1rem;
     margin-bottom: 1rem;
     flex-wrap: wrap;
 }

 .meta-item {
     display: flex;
     align-items: center;
     gap: 0.5rem;
     font-size: 0.9rem;
     color: var(--medium-gray);
 }

 .client-link {
     display: inline-block;
     background: var(--primary-color);
     color: var(--white);
     padding: 0.7rem 1.5rem;
     border-radius: 8px;
     text-decoration: none;
     font-weight: 600;
     transition: all 0.3s;
 }

 .client-link:hover {
     background: var(--secondary-color);
     transform: translateX(5px);
 }

 .no-results {
     text-align: center;
     padding: 3rem;
     color: var(--medium-gray);
     font-size: 1.2rem;
     display: none;
 }

 /* CTA Section */
 .cta-section {
     background: var(--gradient);
     color: var(--white);
     padding: 4rem 0;
     text-align: center;
     margin-top: 4rem;
 }

 .cta-section h2 {
     font-size: 2.5rem;
     margin-bottom: 1rem;
 }

 .cta-section p {
     font-size: 1.2rem;
     margin-bottom: 2rem;
     opacity: 0.9;
 }

 .cta-section .btn-primary {
     background: var(--white);
     color: var(--primary-color);
     padding: 1.2rem 3rem;
     text-decoration: none;
     display: inline-block;
     border-radius: 8px;
     font-weight: 700;
     transition: all 0.3s;
 }

 .cta-section .btn-primary:hover {
     transform: translateY(-3px);
     box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
 }

 /* Footer */
 footer {
     background: var(--dark-color);
     color: var(--white);
     padding: 3rem 0 1rem;
 }

 .footer-content {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
     gap: 2rem;
     margin-bottom: 2rem;
 }

 .footer-section h3 {
     margin-bottom: 1rem;
     color: var(--white);
 }

 .footer-section p {
     color: #94a3b8;
     margin-bottom: 0.5rem;
 }

 .footer-section a {
     display: block;
     color: #94a3b8;
     text-decoration: none;
     margin-bottom: 0.5rem;
     transition: color 0.3s;
 }

 .footer-section a:hover {
     color: var(--accent-color);
 }

 .footer-bottom {
     border-top: 1px solid #334155;
     padding-top: 1.5rem;
     text-align: center;
     color: #94a3b8;
 }

 @media (max-width: 768px) {
     .nav-links {
         display: none;
     }

     .menu-toggle {
         display: flex;
     }

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

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

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

     .section-header h1 {
         font-size: 2rem;
     }
 }