* {
    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 {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 2.5rem;
    color: #ffd700;
}

.logo h1 {
    font-size: 3rem;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
    margin-bottom: 30px;
}

.input-section, .results-section {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.input-section h2 {
    color: #667eea;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.ingredient-input {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.ingredient-input input {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.ingredient-input input:focus {
    outline: none;
    border-color: #667eea;
}

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
}

.btn-success {
    background: #28a745;
    color: white;
}

.btn-success:hover {
    background: #218838;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

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

.ingredient-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
    min-height: 50px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 8px;
}

.ingredient-tag {
    background: #667eea;
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    animation: slideIn 0.3s ease;
}

.ingredient-tag .remove {
    cursor: pointer;
    font-weight: bold;
    opacity: 0.7;
}

.ingredient-tag .remove:hover {
    opacity: 1;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.action-buttons {
    display: flex;
    gap: 15px;
}

/* Demo Section Styles */
.demo-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 12px;
    padding: 20px;
    margin: 20px 0;
    border: 2px solid #e0e0e0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.demo-section h3 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.demo-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 15px;
}

.demo-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 16px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    text-align: left;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
}

.demo-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    background: linear-gradient(135deg, #5a6fd8 0%, #6a4c93 100%);
}

.demo-btn:active {
    transform: translateY(0);
}

.demo-btn i {
    font-size: 16px;
    opacity: 0.9;
}

.demo-hint {
    color: #666;
    font-size: 14px;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    font-style: italic;
}

.demo-hint i {
    color: #667eea;
}

/* Responsive demo buttons */
@media (max-width: 768px) {
    .demo-buttons {
        grid-template-columns: 1fr;
    }
    
    .demo-btn {
        justify-content: center;
        text-align: center;
    }
}

.tabs {
    display: flex;
    border-bottom: 2px solid #e0e0e0;
    margin-bottom: 20px;
}

.tab-btn {
    background: none;
    border: none;
    padding: 15px 25px;
    cursor: pointer;
    font-size: 16px;
    color: #666;
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn.active {
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab-btn:hover {
    color: #667eea;
}

.tab-content {
    min-height: 400px;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.algorithm-info {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    border-left: 4px solid #667eea;
}

.algorithm-info h3 {
    color: #667eea;
    margin-bottom: 5px;
}

.algorithm-info p {
    color: #666;
    font-size: 14px;
}

.recipe-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.recipe-card {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.recipe-card:hover {
    border-color: #667eea;
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.2);
}

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

.recipe-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 10px;
}

.recipe-score {
    background: #28a745;
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 15px;
}

.recipe-ingredients {
    margin-bottom: 15px;
}

.recipe-ingredients h4 {
    color: #667eea;
    margin-bottom: 8px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.ingredient-item {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 5px;
    font-size: 14px;
}

.ingredient-item.available {
    color: #28a745;
}

.ingredient-item.missing {
    color: #dc3545;
}

.ingredient-item i {
    font-size: 12px;
}

.gap-list, .substitution-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.gap-item, .substitution-item {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 15px;
    border-left: 4px solid #667eea;
}

.gap-item h4, .substitution-item h4 {
    color: #333;
    margin-bottom: 8px;
}

.gap-item p, .substitution-item p {
    color: #666;
    font-size: 14px;
}

.footer {
    text-align: center;
    color: white;
    opacity: 0.8;
    font-size: 14px;
}

.loading {
    text-align: center;
    padding: 40px;
    color: #666;
}

.loading i {
    font-size: 2rem;
    animation: spin 1s linear infinite;
    color: #667eea;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.no-results {
    text-align: center;
    padding: 40px;
    color: #666;
}

.no-results i {
    font-size: 3rem;
    color: #ccc;
    margin-bottom: 15px;
}

@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .logo h1 {
        font-size: 2rem;
    }
    
    .recipe-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
}