:root {
    --primary-color: #6366f1;
    --secondary-color: #a78bfa;
    --accent-color: #fbbf24;
    --success-color: #34d399;
    --info-color: #60a5fa;
    --warning-color: #fb923c;
    --danger-color: #f87171;
    --light-bg: #f8fafc;
    --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
}

main {
    flex: 1;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%) !important;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.navbar-nav .nav-link:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white !important;
}

.card {
    border: none;
    border-radius: 1rem;
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
    overflow: hidden;
    background: white;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.15);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    font-weight: 600;
    border: none;
    padding: 1rem 1.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border: none;
    border-radius: 0.5rem;
    padding: 0.6rem 1.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
    background: linear-gradient(135deg, #5558dd 0%, #9571f6 100%);
}

.btn-success {
    background: linear-gradient(135deg, #34d399 0%, #10b981 100%);
    border: none;
    border-radius: 0.5rem;
    padding: 0.6rem 1.5rem;
    font-weight: 600;
}

.btn-secondary {
    background: linear-gradient(135deg, #94a3b8 0%, #64748b 100%);
    border: none;
    border-radius: 0.5rem;
    padding: 0.6rem 1.5rem;
    font-weight: 600;
}

.badge {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-weight: 600;
}

.badge.bg-success {
    background: linear-gradient(135deg, #34d399 0%, #10b981 100%) !important;
}

.badge.bg-info {
    background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%) !important;
}

.badge.bg-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%) !important;
}

.progress {
    height: 1.5rem;
    border-radius: 0.5rem;
    background-color: #e2e8f0;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-container {
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.video-container video {
    max-height: 70vh;
    width: 100%;
}

.video-list {
    max-height: 600px;
    overflow-y: auto;
}

.video-list::-webkit-scrollbar {
    width: 8px;
}

.video-list::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.video-list::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.video-item {
    cursor: pointer;
    transition: all 0.3s ease;
    border-left: 4px solid transparent;
}

.video-item:hover {
    background: linear-gradient(90deg, rgba(99, 102, 241, 0.1) 0%, rgba(167, 139, 250, 0.1) 100%);
    border-left-color: var(--primary-color);
}

.video-item.active {
    background: linear-gradient(90deg, rgba(99, 102, 241, 0.2) 0%, rgba(167, 139, 250, 0.2) 100%);
    border-left-color: var(--primary-color);
}

.video-item.completed {
    background: linear-gradient(90deg, rgba(52, 211, 153, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
    border-left-color: var(--success-color);
}

.video-item.completed:hover {
    background: linear-gradient(90deg, rgba(52, 211, 153, 0.15) 0%, rgba(16, 185, 129, 0.15) 100%);
}

.video-item.active.completed {
    background: linear-gradient(90deg, rgba(52, 211, 153, 0.25) 0%, rgba(16, 185, 129, 0.25) 100%);
    border-left-color: var(--success-color);
}

.completed-badge {
    color: var(--success-color);
    font-size: 1.2rem;
}

.video-progress-indicator {
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.video-progress-bar {
    height: 3px;
    background: #e2e8f0;
    border-radius: 2px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.video-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.video-progress-fill.completed {
    background: linear-gradient(90deg, var(--success-color) 0%, #10b981 100%);
}

.alert {
    border: none;
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.alert-success {
    background: linear-gradient(135deg, rgba(52, 211, 153, 0.2) 0%, rgba(16, 185, 129, 0.2) 100%);
    border-left: 4px solid var(--success-color);
}

.alert-info {
    background: linear-gradient(135deg, rgba(96, 165, 250, 0.2) 0%, rgba(59, 130, 246, 0.2) 100%);
    border-left: 4px solid var(--info-color);
}

.form-control, .form-select {
    border: 2px solid #e2e8f0;
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(99, 102, 241, 0.25);
}

footer {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: white;
    padding: 2rem 0;
}

.container {
    max-width: 1200px;
}

h1, h2, h3, h4, h5 {
    color: #1e293b;
    font-weight: 700;
}

.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 3rem 0;
    margin-bottom: 2rem;
    border-radius: 0 0 2rem 2rem;
}

@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.2rem;
    }

    .card {
        margin-bottom: 1rem;
    }
}

@media print {
    nav, footer, .btn {
        display: none !important;
    }

    .certificate {
        page-break-inside: avoid;
    }
}