:root {
            --primary-color: #1a237e;
            --accent-color: #ffd700;
            --text-dark: #333;
            --text-light: #666;
            --bg-light: #f8f9fa;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Open Sans', sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            overflow-x: hidden;
        }
        
        h1, h2, h3, h4, h5, h6 {
            font-family: 'Poppins', sans-serif;
            font-weight: 600;
        }
        
        .navbar {
            background: rgba(26, 35, 126, 0.95) !important;
            backdrop-filter: blur(10px);
            transition: all 0.3s ease;
            padding: 10px 0;
        }
        
        .navbar-brand {
            font-family: 'Poppins', sans-serif;
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--accent-color) !important;
        }
        
        .navbar-nav .nav-link {
            color: white !important;
            font-weight: 500;
            margin: 0 10px;
            transition: color 0.3s ease;
            padding: 8px 15px !important;
        }
        
        .navbar-nav .nav-link:hover {
            color: var(--accent-color) !important;
        }
        
        .navbar-toggler {
            border: none;
            padding: 0.25rem 0.5rem;
        }
        
        .navbar-toggler:focus {
            box-shadow: none;
        }
        
        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }
        
        .hero-section {
            height: 100vh;
            min-height: 600px;
            background: linear-gradient(135deg, rgba(26, 35, 126, 0.9), rgba(26, 35, 126, 0.7)),
                        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800"><defs><linearGradient id="bg" x1="0%" y1="0%" x2="100%" y2="100%"><stop offset="0%" style="stop-color:%23667eea;stop-opacity:1" /><stop offset="100%" style="stop-color:%23764ba2;stop-opacity:1" /></linearGradient></defs><rect width="1200" height="800" fill="url(%23bg)"/><g fill="rgba(255,255,255,0.1)"><circle cx="300" cy="200" r="50"/><circle cx="800" cy="400" r="80"/><circle cx="1000" cy="150" r="40"/><circle cx="150" cy="600" r="60"/><polygon points="600,100 650,200 550,200"/><polygon points="900,600 950,700 850,700"/></g></svg>');
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: white;
            position: relative;
            padding: 20px;
        }
        
        .hero-content {
            max-width: 100%;
            padding: 0 15px;
        }
        
        .hero-content h1 {
            font-size: 4rem;
            font-weight: 700;
            margin-bottom: 1rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
            line-height: 1.2;
        }
        
        .hero-content p {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.5;
        }
        
        .btn-primary {
            background: var(--accent-color);
            border: none;
            color: var(--primary-color);
            font-weight: 600;
            padding: 12px 30px;
            border-radius: 50px;
            transition: all 0.3s ease;
            margin: 10px;
            font-size: 1rem;
            min-width: 140px;
        }
        
        .btn-primary:hover {
            background: #e6c200;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(255, 215, 0, 0.4);
        }
        
        .btn-outline-light {
            border: 2px solid white;
            color: white;
            font-weight: 600;
            padding: 12px 30px;
            border-radius: 50px;
            transition: all 0.3s ease;
            margin: 10px;
            font-size: 1rem;
            min-width: 140px;
        }
        
        .btn-outline-light:hover {
            background: white;
            color: var(--primary-color);
            transform: translateY(-2px);
        }
        
        .section-padding {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
            padding: 0 15px;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
            line-height: 1.2;
        }
        
        .section-title p {
            font-size: 1.1rem;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }
        
        .card {
            border: none;
            border-radius: 15px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
            overflow: hidden;
            margin-bottom: 20px;
        }
        
        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
        }
        
        .timeline {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        .timeline::after {
            content: '';
            position: absolute;
            width: 4px;
            background: var(--accent-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -2px;
        }
        
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            background: inherit;
            width: 50%;
        }
        
        .timeline-item::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            background: var(--accent-color);
            border-radius: 50%;
            top: 15px;
            right: -10px;
            z-index: 1;
        }
        
        .timeline-item:nth-child(even) {
            left: 50%;
        }
        
        .timeline-item:nth-child(even)::after {
            left: -10px;
        }
        
        .timeline-content {
            padding: 20px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .speaker-card {
            text-align: center;
            margin-bottom: 30px;
            padding: 0 15px;
        }
        
        .speaker-img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            margin: 0 auto 20px;
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 3rem;
            color: white;
        }
        
        .sponsor-logo {
            width: 120px;
            height: 80px;
            background: #f8f9fa;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 15px auto;
            font-size: 1.5rem;
            color: var(--text-light);
            transition: all 0.3s ease;
        }
        
        .sponsor-logo:hover {
            background: var(--primary-color);
            color: white;
        }
        
        .countdown-timer {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 30px;
            padding: 0 15px;
        }
        
        .countdown-item {
            text-align: center;
            background: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            min-width: 100px;
            flex: 1;
            min-width: 80px;
        }
        
        .countdown-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            display: block;
        }
        
        .countdown-label {
            font-size: 0.9rem;
            color: var(--text-light);
            text-transform: uppercase;
            font-weight: 600;
        }
        
        .footer {
            background: var(--primary-color);
            color: white;
            padding: 50px 0 20px;
        }
        
        .footer h5 {
            color: var(--accent-color);
            margin-bottom: 20px;
        }
        
        .footer a {
            color: white;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        
        .footer a:hover {
            color: var(--accent-color);
        }
        
        .social-links {
            display: flex;
            gap: 15px;
            justify-content: center;
            margin-top: 30px;
            flex-wrap: wrap;
        }
        
        .social-links a {
            width: 40px;
            height: 40px;
            background: var(--accent-color);
            color: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            transition: all 0.3s ease;
        }
        
        .social-links a:hover {
            background: white;
            transform: translateY(-2px);
        }
        
        .modal-content {
            border-radius: 15px;
            border: none;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }
        
        .modal-header {
            background: var(--primary-color);
            color: white;
            border-radius: 15px 15px 0 0;
            padding: 20px 25px;
        }
        
        .modal-body {
            padding: 25px;
        }
        
        .modal-footer {
            padding: 20px 25px;
            border-top: 1px solid #e9ecef;
        }
        
        .form-label {
            font-weight: 600;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        
        .form-control {
            border-radius: 10px;
            border: 2px solid #e9ecef;
            padding: 12px 15px;
            transition: border-color 0.3s ease;
            font-size: 14px;
        }
        
        .form-control:focus {
            border-color: var(--accent-color);
            box-shadow: 0 0 0 0.2rem rgba(255, 215, 0, 0.25);
        }
        
        .form-check-input:checked {
            background-color: var(--accent-color);
            border-color: var(--accent-color);
        }
        
        .form-check-input:focus {
            box-shadow: 0 0 0 0.2rem rgba(255, 215, 0, 0.25);
        }
        
        .btn-close-white {
            filter: invert(1) grayscale(100%) brightness(200%);
        }
        
        /* Success modal styling */
        .modal-content.bg-success {
            background: linear-gradient(135deg, #28a745, #20c997);
        }
        
        .text-success {
            color: #28a745 !important;
        }
        
        .animate-fadeIn {
            animation: fadeIn 0.5s ease-in;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        /* Mobile Responsive Styles */
        @media (max-width: 1200px) {
            .hero-content h1 {
                font-size: 3.5rem;
            }
            
            .section-title h2 {
                font-size: 2.2rem;
            }
        }
        
        @media (max-width: 992px) {
            .hero-content h1 {
                font-size: 3rem;
            }
            
            .hero-content p {
                font-size: 1.2rem;
            }
            
            .section-padding {
                padding: 60px 0;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
            
            .countdown-item {
                min-width: 70px;
                padding: 15px 10px;
            }
            
            .countdown-number {
                font-size: 2rem;
            }
        }
        
        @media (max-width: 768px) {
            .navbar-brand {
                font-size: 1.5rem;
            }
            
            .hero-section {
                min-height: 500px;
                padding: 15px;
            }
            
            .hero-content h1 {
                font-size: 2.5rem;
                margin-bottom: 0.8rem;
            }
            
            .hero-content p {
                font-size: 1.1rem;
                margin-bottom: 1.5rem;
            }
            
            .btn-primary,
            .btn-outline-light {
                padding: 10px 25px;
                font-size: 0.9rem;
                min-width: 120px;
                margin: 5px;
            }
            
            .section-padding {
                padding: 50px 0;
            }
            
            .section-title {
                margin-bottom: 40px;
            }
            
            .section-title h2 {
                font-size: 1.8rem;
                margin-bottom: 10px;
            }
            
            .section-title p {
                font-size: 1rem;
            }
            
            .timeline::after {
                left: 31px;
            }
            
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            
            .timeline-item::after {
                left: 22px;
            }
            
            .timeline-item:nth-child(even) {
                left: 0;
            }
            
            .speaker-img {
                width: 120px;
                height: 120px;
                font-size: 2.5rem;
            }
            
            .sponsor-logo {
                width: 100px;
                height: 70px;
                font-size: 1.2rem;
            }
            
            .countdown-timer {
                gap: 10px;
            }
            
            .countdown-item {
                min-width: 60px;
                padding: 12px 8px;
            }
            
            .countdown-number {
                font-size: 1.8rem;
            }
            
            .countdown-label {
                font-size: 0.8rem;
            }
            
            .footer {
                padding: 40px 0 20px;
            }
            
            .social-links {
                gap: 10px;
            }
            
            .social-links a {
                width: 35px;
                height: 35px;
                font-size: 1rem;
            }
            
            /* Modal responsive improvements */
            .modal-dialog {
                margin: 10px;
                max-width: calc(100% - 20px);
            }
            
            .modal-body {
                padding: 20px;
            }
            
            .modal-header {
                padding: 15px 20px;
            }
            
            .modal-footer {
                padding: 15px 20px;
            }
            
            .form-control {
                padding: 10px 12px;
                font-size: 16px; /* Prevents zoom on iOS */
            }
        }
        
        @media (max-width: 576px) {
            .navbar {
                padding: 8px 0;
            }
            
            .navbar-brand {
                font-size: 1.3rem;
            }
            
            .hero-section {
                min-height: 450px;
                padding: 10px;
            }
            
            .hero-content h1 {
                font-size: 2rem;
                margin-bottom: 0.6rem;
            }
            
            .hero-content p {
                font-size: 1rem;
                margin-bottom: 1.2rem;
            }
            
            .btn-primary,
            .btn-outline-light {
                padding: 8px 20px;
                font-size: 0.85rem;
                min-width: 100px;
                margin: 3px;
                display: block;
                width: 100%;
                max-width: 200px;
                margin-left: auto;
                margin-right: auto;
            }
            
            .section-padding {
                padding: 40px 0;
            }
            
            .section-title h2 {
                font-size: 1.6rem;
            }
            
            .section-title p {
                font-size: 0.9rem;
            }
            
            .speaker-img {
                width: 100px;
                height: 100px;
                font-size: 2rem;
            }
            
            .sponsor-logo {
                width: 80px;
                height: 60px;
                font-size: 1rem;
            }
            
            .countdown-timer {
                gap: 8px;
            }
            
            .countdown-item {
                min-width: 50px;
                padding: 10px 6px;
            }
            
            .countdown-number {
                font-size: 1.5rem;
            }
            
            .countdown-label {
                font-size: 0.7rem;
            }
            
            .footer {
                padding: 30px 0 15px;
            }
            
            .social-links a {
                width: 30px;
                height: 30px;
                font-size: 0.9rem;
            }
            
            .form-control {
                padding: 10px 12px;
                font-size: 0.9rem;
            }
        }
        
        @media (max-width: 375px) {
            .hero-content h1 {
                font-size: 1.8rem;
            }
            
            .hero-content p {
                font-size: 0.9rem;
            }
            
            .section-title h2 {
                font-size: 1.4rem;
            }
            
            .countdown-item {
                min-width: 45px;
                padding: 8px 4px;
            }
            
            .countdown-number {
                font-size: 1.3rem;
            }
            
            .countdown-label {
                font-size: 0.6rem;
            }
        }