:root {
     --primary-color: #0066cc;
     --secondary-color: #00a86b;
     --dark-bg: #1a1a2e;
     --light-bg: #f8f9fa;
 }

 body {
     font-family: 'Montserrat', sans-serif;
     font-weight: 600;
     color: #333;
 }




 .categories-section {
     padding: 60px 0;
 }

 .section-title {
     font-size: 2rem;
     font-weight: 600;
     color: var(--primary-color);
     margin-bottom: 2rem;
     position: relative;
     padding-bottom: 15px;
 }

 .section-title::after {
     content: '';
     position: absolute;
     bottom: 0;
     left: 0;
     width: 60px;
     height: 4px;
     background: var(--secondary-color);
 }

 .category-card {
     display: block;
     background: white;
     padding: 30px;
     margin-bottom: 20px;
     border-radius: 10px;
     box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
     text-decoration: none;
     transition: transform 0.3s ease, box-shadow 0.3s ease;
 }

 .category-card:hover {
     transform: translateY(-5px);
     box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
 }

 .category-text {
     margin: 0;
     font-size: 1.1rem;
     font-weight: 600;
     color: #333;
     text-align: center;
 }

 @media (max-width: 768px) {
     .section-title {
         font-size: 1.5rem;
     }

     .categories-section {
         padding: 40px 0;
     }
 }

 .hero-section {
     background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
     color: white;
     padding: 80px 0;
 }

 .hero-section h1 {
     font-size: 3rem;
     font-weight: 700;
     margin-bottom: 1rem;
 }

 .hero-section .lead {
     font-size: 1.25rem;
     line-height: 1.8;
     opacity: 0.95;
 }

 .section-title {
     font-size: 2rem;
     font-weight: 600;
     color: var(--primary-color);
     margin-bottom: 2rem;
     position: relative;
     padding-bottom: 15px;
 }

 .section-title::after {
     content: '';
     position: absolute;
     bottom: 0;
     left: 0;
     width: 60px;
     height: 4px;
     background: var(--secondary-color);
 }

 .spec-card {
     background: white;
     border-radius: 10px;
     padding: 25px;
     margin-bottom: 20px;
     box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
     transition: transform 0.3s ease, box-shadow 0.3s ease;
 }

 .spec-card:hover {
     transform: translateY(-5px);
     box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
 }

 .spec-label {
     font-weight: 600;
     color: var(--primary-color);
     font-size: 0.95rem;
     margin-bottom: 5px;
 }

 .spec-value {
     font-size: 1.1rem;
     color: #333;
 }

 .applications-section,
 .advantages-section {
     background: var(--light-bg);
     padding: 60px 0;
 }

 .specifications-section {
     padding: 60px 0;
 }

 .list-item {
     background: white;
     padding: 20px;
     margin-bottom: 15px;
     border-radius: 8px;
     border-left: 4px solid var(--secondary-color);
     box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
     transition: all 0.3s ease;
 }

 .list-item:hover {
     border-left-width: 6px;
     box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
 }

 .list-item-text {
     margin: 0;
     font-size: 1.05rem;
     color: #333;
 }



 .energy-section {
     padding: 3rem 1rem;
 }

 .energy-container {
     max-width: 1140px;
     margin: auto;
 }

 .energy-row {
     align-items: center;
 }

 .energy-image-wrapper {
     text-align: center;
 }

 .energy-image {
     width: 100%;
     height: 500px;
     border-radius: 10px;
     object-fit: cover;
 }

 .energy-text-wrapper {
     display: flex;
     align-items: center;
     height: 100%;
 }

 .energy-text {
     font-size: 1.125rem;
     line-height: 1.8;
     text-align: justify;
     text-justify: inter-word;
     margin: 0;
     width: 100%;
     /* ensures text spans full width */
 }

 /* modal form */
 .event-card {
     transition: transform 0.3s ease, box-shadow 0.3s ease;
     cursor: pointer;
 }

 .event-card:hover {
     transform: translateY(-5px);
     box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15) !important;
 }

 .btn-send {
     background-color: #b30015;
     color: white;
     border: none;
     padding: 10px 20px;
     border-radius: 5px;
     font-weight: 500;
 }

 .btn-send:hover {
     background-color: #860110;
 }

 .form-select {
     color: #6c757d;
 }

 .form-select:focus {
     border-color: #0056b3;
     box-shadow: 0 0 0 0.25rem rgba(0, 86, 179, 0.25);
 }

 .form-select option:first-child {
     color: #6c757d;
 }

 .form-select option:not(:first-child) {
     color: #212529;
 }

 /* Responsive adjustments */
 @media (max-width: 768px) {
     .energy-section {
         padding: 2rem 1rem;
     }

     .energy-text {
         text-align: justify;
         line-height: 1.6;
         width: 100%;
     }

     .energy-text-wrapper {
         justify-content: center;
     }
 }



 @media (max-width: 768px) {
     .hero-section h1 {
         font-size: 2rem;
     }

     .hero-section .lead {
         font-size: 1rem;
     }

     .section-title {
         font-size: 1.5rem;
     }

     .hero-section {
         padding: 50px 0;
     }

     .specifications-section,
     .applications-section,
     .advantages-section {
         padding: 40px 0;
     }
 }