* {
    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%);
    min-height: 100vh;
    color: #333;
}

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

header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 20px 0;
    margin-bottom: 30px;
    border-radius: 15px;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.logo {
    font-size: 28px;
    font-weight: bold;
    color: #667eea;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 20px;
    list-style: none;
}

/* Status badges for feature cards */
.feature-card {
    position: relative;
}

.status-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: bold;
    z-index: 10;
}

.status-badge.completed {
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
    box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.status-badge.pending {
    background: linear-gradient(135deg, #FF9800, #F57C00);
    color: white;
    box-shadow: 0 2px 8px rgba(255, 152, 0, 0.3);
}

.feature-card.completed {
    border: 2px solid #4CAF50;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(76, 175, 80, 0.2), 0 0 0 1px rgba(76, 175, 80, 0.1);
}

.feature-card.completed::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.03), rgba(69, 160, 73, 0.03));
    border-radius: inherit;
    pointer-events: none;
    z-index: 1;
}

.feature-card.completed h3,
.feature-card.completed p,
.feature-card.completed .btn {
    position: relative;
    z-index: 2;
}

.feature-card.completed h3 {
    color: #2E7D32;
}

.feature-card.completed p {
    color: #424242;
}

/* Ensure completed cards appear first */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.card-grid .feature-card.completed {
    order: -1;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 10px 15px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.nav-links a:hover {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
}

.page-title {
    text-align: center;
    color: white;
    font-size: 2.5rem;
    margin-bottom: 30px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.18);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(31, 38, 135, 0.5);
}

.feature-card h3 {
    color: #667eea;
    font-size: 1.4rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 15px;
}

.btn {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 12px 25px;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.btn-success {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
}

.btn-warning {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.btn-danger {
    background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
}

/* صفحة التجارب */
.demo-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
}

.demo-section h2 {
    color: #667eea;
    font-size: 1.8rem;
    margin-bottom: 20px;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

.result-display {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 15px;
    margin: 15px 0;
    font-family: 'Courier New', monospace;
    min-height: 100px;
    white-space: pre-wrap;
}

.status {
    padding: 10px 15px;
    border-radius: 8px;
    margin: 10px 0;
    font-weight: 500;
}

.status.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.status.info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #333;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Footer */
footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 30px 0;
    margin-top: 50px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
}

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

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #764ba2;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 20px;
    }
    
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 15px;
    }
}

/* إضافات خاصة للتجارب */
.video-container {
    position: relative;
    width: 100%;
    max-width: 640px;
    margin: 20px 0;
}

.video-container video {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.canvas-container {
    border: 2px solid #667eea;
    border-radius: 8px;
    margin: 20px 0;
    overflow: hidden;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background: #e9ecef;
    border-radius: 10px;
    overflow: hidden;
    margin: 10px 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transition: width 0.3s ease;
    border-radius: 10px;
}

.badge {
    display: inline-block;
    padding: 4px 8px;
    background: #667eea;
    color: white;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    margin: 2px;
}

.flex-container {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    align-items: center;
}

.flex-item {
    flex: 1;
    min-width: 200px;
}

.highlight {
    background: #fff3cd;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ffeaa7;
    margin: 10px 0;
}

.code-block {
    background: #2d3748;
    color: #e2e8f0;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    margin: 15px 0;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}