/* CSS Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #4CAF50;
    --primary-dark: #388E3C;
    --primary-light: #C8E6C9;
    --secondary-color: #607D8B;
    --secondary-dark: #455A64;
    --accent-color: #FF9800;
    --danger-color: #f44336;
    --background-color: #f5f7fa;
    --card-background: #ffffff;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

html {
    font-size: 16px;
}

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

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 2rem 1rem;
    text-align: center;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo {
    width: 48px;
    height: 48px;
    border-radius: 8px;
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
}

.tagline {
    font-size: 1rem;
    opacity: 0.9;
    margin-top: 0.5rem;
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Card Styles */
.card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-hover);
}

.card h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-light);
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--secondary-dark);
}

.btn-success {
    background-color: var(--primary-color);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background-color: var(--primary-dark);
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background-color: #d32f2f;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    background-color: var(--secondary-color);
    color: white;
    font-size: 1.2rem;
}

.btn-icon:hover {
    background-color: var(--secondary-dark);
}

.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

/* Input Styles */
input[type="text"],
input[type="number"],
input[type="date"] {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    transition: var(--transition);
    background-color: white;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="date"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

/* Search Section */
.search-container {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.search-container input {
    flex: 1;
}

.search-results {
    max-height: 300px;
    overflow-y: auto;
    border-radius: 8px;
}

.search-result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.5rem;
    transition: var(--transition);
    cursor: pointer;
}

.search-result-item:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-color);
}

.food-info {
    flex: 1;
}

.food-name {
    font-weight: 600;
    color: var(--text-primary);
}

.food-details {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.quantity-input {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quantity-input input {
    width: 80px;
    text-align: center;
}

.quantity-input span {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Meal Section */
.meal-list {
    min-height: 100px;
    margin-bottom: 1rem;
}

.meal-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background-color: var(--background-color);
    border-radius: 8px;
    margin-bottom: 0.5rem;
}

.meal-item-info {
    flex: 1;
}

.meal-item-name {
    font-weight: 500;
}

.meal-item-details {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.meal-item-calories {
    font-weight: 600;
    color: var(--primary-color);
    margin-right: 1rem;
}

.meal-item-actions {
    display: flex;
    gap: 0.5rem;
}

.meal-summary {
    background-color: var(--primary-light);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.calories-value {
    color: var(--primary-dark);
    font-size: 1.25rem;
}

.summary-details {
    display: flex;
    justify-content: space-around;
    gap: 1rem;
}

.macro {
    text-align: center;
}

.macro-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.macro-value {
    font-weight: 600;
    color: var(--text-primary);
}

.meal-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.meal-actions input {
    flex: 1;
    min-width: 150px;
}

/* Daily Summary Section */
.date-selector {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.date-selector input {
    width: auto;
    text-align: center;
}

.daily-totals {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.total-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
}

.total-label {
    display: block;
    font-size: 0.85rem;
    opacity: 0.9;
    margin-bottom: 0.25rem;
}

.total-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
}

.total-unit {
    font-size: 0.85rem;
    opacity: 0.9;
}

.saved-meals {
    margin-top: 1rem;
}

.saved-meal-card {
    background-color: var(--background-color);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 0.75rem;
}

.saved-meal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.saved-meal-name {
    font-weight: 600;
    color: var(--text-primary);
}

.saved-meal-time {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.saved-meal-calories {
    font-weight: 600;
    color: var(--primary-color);
}

.saved-meal-items {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.saved-meal-actions {
    margin-top: 0.75rem;
    display: flex;
    gap: 0.5rem;
}

/* Empty State */
.empty-message {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
    font-style: italic;
}

/* Footer */
.footer {
    background-color: var(--text-primary);
    color: white;
    text-align: center;
    padding: 1.5rem 1rem;
    margin-top: auto;
}

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

.footer a:hover {
    color: #FFB74D;
    text-decoration: underline;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-dark);
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--text-primary);
    color: white;
    padding: 1rem 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow-hover);
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

.toast.success {
    background-color: var(--primary-color);
}

.toast.error {
    background-color: var(--danger-color);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 1.5rem 1rem;
    }

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

    .logo {
        width: 40px;
        height: 40px;
    }

    .main-content {
        padding: 1rem;
        gap: 1rem;
    }

    .card {
        padding: 1rem;
    }

    .search-container {
        flex-direction: column;
    }

    .search-container .btn {
        width: 100%;
    }

    .meal-actions {
        flex-direction: column;
    }

    .meal-actions .btn {
        width: 100%;
    }

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

    .total-value {
        font-size: 1.5rem;
    }

    .quantity-input {
        flex-direction: column;
        align-items: flex-end;
    }

    .quantity-input input {
        width: 70px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.25rem;
    }

    .tagline {
        font-size: 0.9rem;
    }

    .search-result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .quantity-input {
        width: 100%;
        flex-direction: row;
        justify-content: flex-end;
    }

    .meal-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .meal-item-calories {
        margin-right: 0;
    }

    .meal-item-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .summary-details {
        flex-direction: row;
        gap: 0.5rem;
    }

    .date-selector {
        flex-wrap: wrap;
    }
}

/* Print Styles */
@media print {
    .header {
        background: none;
        color: var(--text-primary);
    }

    .btn, .search-section {
        display: none;
    }

    .card {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
}