:root {
            --csi-primary: #0056a6;
            --csi-secondary: #ff6b35;
            --csi-dark: #1a2b4d;
            --csi-light: #f8f9fa;
            --csi-gray: #6c757d;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--csi-dark);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--csi-primary) !important;
        }
        .nav-link {
            font-weight: 600;
            padding: 0.5rem 1rem !important;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--csi-secondary) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--csi-primary) 0%, #1a2b4d 100%);
            color: white;
            padding: 6rem 0;
            position: relative;
            overflow: hidden;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
        }
        .hero-section .lead {
            font-size: 1.3rem;
            opacity: 0.9;
        }
        .btn-csi-primary {
            background-color: var(--csi-secondary);
            border-color: var(--csi-secondary);
            color: white;
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 50px;
            transition: all 0.3s;
        }
        .btn-csi-primary:hover {
            background-color: #e05a2c;
            border-color: #e05a2c;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .btn-csi-outline {
            border: 2px solid white;
            color: white;
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 50px;
            transition: all 0.3s;
        }
        .btn-csi-outline:hover {
            background-color: white;
            color: var(--csi-primary);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--csi-secondary);
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .card-title {
            color: var(--csi-primary);
            font-weight: 700;
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: rgba(0, 86, 166, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            color: var(--csi-primary);
            font-size: 1.8rem;
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--csi-primary);
            margin-bottom: 1rem;
        }
        .stats-section {
            background-color: var(--csi-light);
            padding: 5rem 0;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--csi-primary);
            line-height: 1;
        }
        .flink {
            display: inline-block;
            padding: 0.5rem 1rem;
            margin: 0.25rem;
            background: var(--csi-light);
            border-radius: 8px;
            color: var(--csi-dark);
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background: var(--csi-primary);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--csi-dark);
            color: rgba(255,255,255,0.8);
        }
        footer a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .footer-bottom {
            background-color: rgba(0,0,0,0.2);
            padding: 1.5rem 0;
            font-size: 0.9rem;
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            margin-right: 0.5rem;
            transition: all 0.3s;
        }
        .social-icons a:hover {
            background: var(--csi-secondary);
            transform: translateY(-3px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--csi-secondary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--csi-primary);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section .lead {
                font-size: 1.1rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }
        .event-card .badge {
            position: absolute;
            top: 15px;
            right: 15px;
            z-index: 2;
        }
        .member-card {
            text-align: center;
            padding: 2rem 1rem;
        }
        .member-img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 1.5rem;
            border: 5px solid #f1f1f1;
        }
        .partner-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: all 0.3s;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .partner-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .partner-logo img {
            max-height: 50px;
            max-width: 150px;
        }
        .form-control:focus {
            border-color: var(--csi-primary);
            box-shadow: 0 0 0 0.25rem rgba(0, 86, 166, 0.25);
        }