/* CSS Variables */
:root {
    --primary-color: #4CAF50;
    --primary-dark: #388E3C;
    --primary-light: #C8E6C9;
    --secondary-color: #FF9800;
    --secondary-dark: #F57C00;
    --accent-color: #2196F3;
    --text-primary: #212121;
    --text-secondary: #757575;
    --background: #FAFAFA;
    --surface: #FFFFFF;
    --border-color: #E0E0E0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
    --radius: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 30px 0;
    text-align: center;
    box-shadow: var(--shadow);
}

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

.logo-img {
    width: 50px;
    height: 50px;
    border-radius: 10px;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
}

.tagline {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 30px 0;
}

/* Configuration Panel */
.config-panel {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.config-panel h2 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    color: var(--primary-dark);
    border-bottom: 2px solid var(--primary-light);
    padding-bottom: 10px;
}

.config-section {
    margin-bottom: 30px;
}

.config-section h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

/* Checkbox Group */
.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 10px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 10px 15px;
    background: var(--background);
    border-radius: var(--radius);
    transition: var(--transition);
    border: 2px solid transparent;
}

.checkbox-label:hover {
    background: var(--primary-light);
}

.checkbox-label input {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    margin-right: 10px;
    position: relative;
    transition: var(--transition);
}

.checkbox-label input:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    color: white;
    font-size: 14px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Calorie Input */
.calorie-input-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

#calorie-slider {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
}

#calorie-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

#calorie-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.calorie-display {
    display: flex;
    align-items: center;
    gap: 10px;
}

#calorie-input {
    width: 100px;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
}

#calorie-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.calorie-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
}

.preset-btn {
    padding: 8px 16px;
    background: var(--background);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.preset-btn:hover {
    border-color: var(--primary-color);
    background: var(--primary-light);
}

/* Preference Group */
.preference-group {
    margin-bottom: 20px;
}

.preference-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.preference-group select {
    width: 100%;
    max-width: 300px;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    background: white;
    cursor: pointer;
}

.preference-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.cuisine-group {
    margin-top: 10px;
}

/* Generate Button */
.generate-btn {
    width: 100%;
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

/* Sections */
.meal-plan-section,
.recipe-section,
.shopping-section {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.hidden {
    display: none !important;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.section-header h2 {
    font-size: 1.5rem;
    color: var(--primary-dark);
}

.plan-actions,
.shopping-actions {
    display: flex;
    gap: 10px;
}

.action-btn {
    padding: 10px 20px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.action-btn:hover {
    background: #1976D2;
}

.close-btn {
    width: 40px;
    height: 40px;
    background: var(--background);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    background: var(--border-color);
}

/* Plan Summary */
.plan-summary {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    padding: 15px;
    background: var(--primary-light);
    border-radius: var(--radius);
    margin-bottom: 25px;
}

.summary-item {
    display: flex;
    gap: 8px;
}

.summary-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.summary-value {
    font-weight: 600;
    color: var(--primary-dark);
}

/* Meal Plan Container */
.meal-plan-container {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.day-card {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.day-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.day-header h3 {
    font-size: 1.2rem;
}

.day-calories {
    background: rgba(255, 255, 255, 0.2);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
}

.meals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 15px;
    padding: 20px;
}

.meal-card {
    background: var(--background);
    border-radius: var(--radius);
    padding: 15px;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.meal-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.meal-type {
    font-size: 0.85rem;
    color: var(--secondary-color);
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.meal-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.meal-info {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.meal-info span {
    background: var(--surface);
    padding: 4px 10px;
    border-radius: 15px;
}

/* Recipe Container */
.recipe-container {
    max-height: 70vh;
    overflow-y: auto;
}

.recipe-detail {
    padding: 10px;
}

.recipe-header {
    margin-bottom: 25px;
}

.recipe-header h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.recipe-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.recipe-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.recipe-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 15px;
}

.recipe-tag {
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
}

.recipe-section-title {
    font-size: 1.2rem;
    color: var(--primary-dark);
    margin: 25px 0 15px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-light);
}

.ingredients-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
}

.ingredients-list li {
    padding: 10px 15px;
    background: var(--background);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: 10px;
}

.ingredients-list li::before {
    content: '•';
    color: var(--primary-color);
    font-weight: bold;
}

.instructions-list {
    list-style: none;
    counter-reset: step;
}

.instructions-list li {
    padding: 15px;
    background: var(--background);
    border-radius: var(--radius);
    margin-bottom: 10px;
    position: relative;
    padding-left: 50px;
}

.instructions-list li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 15px;
    width: 25px;
    height: 25px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.85rem;
}

.nutrition-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
}

.nutrition-item {
    text-align: center;
    padding: 15px;
    background: var(--background);
    border-radius: var(--radius);
}

.nutrition-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nutrition-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* Shopping List */
.shopping-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.filter-btn {
    padding: 8px 16px;
    background: var(--background);
    border: 2px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--primary-color);
}

.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.shopping-list-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.shopping-category {
    margin-bottom: 20px;
}

.category-header {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-dark);
    padding: 10px 0;
    border-bottom: 2px solid var(--primary-light);
    margin-bottom: 10px;
}

.shopping-item {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    background: var(--background);
    border-radius: var(--radius);
    transition: var(--transition);
    cursor: pointer;
}

.shopping-item:hover {
    background: var(--primary-light);
}

.shopping-item.checked {
    opacity: 0.6;
}

.shopping-item.checked .item-name {
    text-decoration: line-through;
}

.item-checkbox {
    width: 22px;
    height: 22px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    margin-right: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.shopping-item.checked .item-checkbox {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.item-name {
    flex: 1;
    font-weight: 500;
}

.item-quantity {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 20px 0;
    text-align: center;
    margin-top: auto;
}

.footer a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.footer a:hover {
    color: var(--secondary-dark);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 20px 0;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .logo {
        flex-direction: column;
        gap: 10px;
    }

    .tagline {
        font-size: 0.95rem;
    }

    .config-panel {
        padding: 20px;
    }

    .checkbox-group {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    }

    .calorie-presets {
        flex-direction: column;
    }

    .preset-btn {
        width: 100%;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .plan-actions,
    .shopping-actions {
        width: 100%;
        justify-content: flex-start;
    }

    .action-btn {
        flex: 1;
    }

    .meals-grid {
        grid-template-columns: 1fr;
    }

    .plan-summary {
        flex-direction: column;
        gap: 10px;
    }

    .day-header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }

    .ingredients-list {
        grid-template-columns: 1fr;
    }

    .nutrition-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .recipe-meta {
        flex-direction: column;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .checkbox-group {
        grid-template-columns: 1fr;
    }

    .checkbox-label {
        padding: 12px;
    }

    .generate-btn {
        padding: 14px 24px;
        font-size: 1rem;
    }

    .meal-plan-section,
    .recipe-section,
    .shopping-section {
        padding: 20px;
    }

    .shopping-filters {
        justify-content: center;
    }

    .filter-btn {
        font-size: 0.8rem;
        padding: 6px 12px;
    }
}

/* Print Styles */
@media print {
    .header,
    .config-panel,
    .plan-actions,
    .shopping-actions,
    .shopping-filters,
    .footer {
        display: none !important;
    }

    .meal-plan-section,
    .shopping-section {
        box-shadow: none;
        padding: 0;
    }

    .day-card {
        break-inside: avoid;
        page-break-inside: avoid;
    }

    .meal-card {
        border: 1px solid #ccc;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.meal-plan-section:not(.hidden),
.recipe-section:not(.hidden),
.shopping-section:not(.hidden) {
    animation: fadeIn 0.3s ease;
}

.day-card {
    animation: fadeIn 0.3s ease;
    animation-fill-mode: both;
}

.day-card:nth-child(1) { animation-delay: 0.05s; }
.day-card:nth-child(2) { animation-delay: 0.1s; }
.day-card:nth-child(3) { animation-delay: 0.15s; }
.day-card:nth-child(4) { animation-delay: 0.2s; }
.day-card:nth-child(5) { animation-delay: 0.25s; }
.day-card:nth-child(6) { animation-delay: 0.3s; }
.day-card:nth-child(7) { animation-delay: 0.35s; }