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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #333;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.page-header {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px 20px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.page-header h1 {
    font-size: 48px;
    color: #667eea;
    margin-bottom: 10px;
}

.page-header p {
    font-size: 20px;
    color: #666;
}

/* Progress Section */
.progress-section {
    background: white;
    padding: 40px 20px;
    margin: 30px 20px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.progress-section h2 {
    font-size: 32px;
    color: #333;
    margin-bottom: 20px;
}

.progress-bar-container {
    width: 100%;
    height: 30px;
    background: #e0e0e0;
    border-radius: 15px;
    overflow: hidden;
    margin: 20px 0;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    width: 0%;
    transition: width 0.5s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.progress-text {
    font-size: 18px;
    color: #666;
    margin: 15px 0;
}

.reset-btn {
    background: #6c757d;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
}

.reset-btn:hover {
    background: #5a6268;
    transform: translateY(-2px);
}

/* Labs Section */
.labs-section {
    padding: 40px 20px 80px;
}

.labs-section h2 {
    font-size: 36px;
    color: white;
    text-align: center;
    margin-bottom: 15px;
}

.section-description {
    text-align: center;
    color: rgba(255, 255, 255, 0.9);
    font-size: 18px;
    margin-bottom: 40px;
}

/* Labs Grid */
.labs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

/* Lab Card */
.lab-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.lab-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.lab-card:hover::before {
    transform: scaleX(1);
}

.lab-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.lab-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 32px;
    color: white;
}

.lab-title {
    font-size: 24px;
    color: #333;
    margin-bottom: 12px;
}

.lab-description {
    font-size: 15px;
    color: #666;
    line-height: 1.6;
    margin-bottom: 20px;
    min-height: 48px;
}

.lab-meta {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.difficulty-badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
}

.difficulty-badge.beginner {
    background: #d4edda;
    color: #155724;
}

.difficulty-badge.intermediate {
    background: #fff3cd;
    color: #856404;
}

.difficulty-badge.advanced {
    background: #f8d7da;
    color: #721c24;
}

.completed-badge {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    background: #28a745;
    color: white;
}

.start-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.start-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.start-btn i {
    font-size: 14px;
}

/* Footer */
.page-footer {
    background: rgba(0, 0, 0, 0.2);
    color: white;
    padding: 30px 20px;
    text-align: center;
    backdrop-filter: blur(10px);
}

.page-footer p {
    margin: 5px 0;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .page-header h1 {
        font-size: 36px;
    }

    .page-header p {
        font-size: 16px;
    }

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

    .labs-section h2 {
        font-size: 28px;
    }

    .progress-section {
        margin: 20px 10px;
    }
}

@media (max-width: 480px) {
    .page-header {
        padding: 30px 15px;
    }

    .page-header h1 {
        font-size: 28px;
    }

    .lab-title {
        font-size: 20px;
    }

    .lab-card {
        padding: 20px;
    }
}

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.lab-card {
    animation: fadeIn 0.5s ease;
}