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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1e90ff 0%, #000080 100%);
    min-height: 100vh;
    padding: 20px;
}

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

header {
    text-align: center;
    color: white;
    margin-bottom: 50px;
    animation: slideDown 0.6s ease-out;
}

header h1 {
    font-size: 3em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

header p {
    font-size: 1.1em;
    opacity: 0.9;
}

.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.video-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeInUp 0.6s ease-out;
}

.video-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.video-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
    cursor: pointer;
    display: block;
    background-color: #f0f0f0;
    transition: opacity 0.3s ease;
}

.video-thumbnail:hover {
    opacity: 0.8;
}

.video-card h3 {
    padding: 15px 15px 5px;
    color: #333;
    font-size: 1.3em;
}

.video-card p {
    padding: 0 15px 15px;
    color: #666;
    font-size: 0.9em;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    animation: fadeIn 0.3s ease;
}

.modal-content {
    position: relative;
    width: 90%;
    max-width: 1000px;
    height: 90vh;
    margin: 5vh auto;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.5);
}

#fullscreenVideo {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.close {
    position: absolute;
    right: 20px;
    top: 15px;
    color: white;
    font-size: 35px;
    font-weight: bold;
    cursor: pointer;
    z-index: 1001;
    transition: color 0.3s ease;
}

.close:hover {
    color: #ff6b6b;
}

/* Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }

    .videos-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .modal-content {
        width: 95%;
        height: 95vh;
        margin: 2.5vh auto;
    }

    .close {
        font-size: 28px;
        right: 10px;
        top: 10px;
    }
}