/**
 * Mobile-first responsive CSS for Meal Prep Manager
 * Optimized for iOS and mobile devices with desktop support
 */

/* CSS Variables for consistent theming */
:root {
    --primary-color: #007AFF;
    --primary-hover: #0056CC;
    --secondary-color: #34C759;
    --danger-color: #FF3B30;
    --warning-color: #FF9500;
    --background-color: #F2F2F7;
    --surface-color: #FFFFFF;
    --text-primary: #000000;
    --text-secondary: #6D6D70;
    --text-tertiary: #C7C7CC;
    --border-color: #C6C6C8;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
    --border-radius: 10px;
    --border-radius-lg: 16px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--background-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Loading screen */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--surface-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--text-tertiary);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

/* Screen management */
.screen {
    min-height: 100vh;
}

/* Login screen */
#login-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.login-container {
    width: 100%;
    max-width: 400px;
    background: var(--surface-color);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.login-container h1 {
    margin-bottom: var(--spacing-xl);
    color: var(--primary-color);
    font-size: 1.8rem;
    font-weight: 600;
}

.login-container h1 i {
    margin-right: var(--spacing-sm);
}

#login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Form elements */
input, select, textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 16px; /* Prevents zoom on iOS */
    background-color: var(--surface-color);
    transition: border-color 0.2s ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

/* Buttons */
button {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius);
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    min-height: 44px; /* iOS touch target */
}

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

.primary-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.secondary-btn {
    background-color: var(--text-tertiary);
    color: var(--text-primary);
}

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

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

.danger-btn:hover {
    background-color: #D70015;
}

/* Main app layout */
#main-app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    background-color: var(--surface-color);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.logout-btn {
    padding: var(--spacing-sm);
    background-color: transparent;
    color: var(--text-secondary);
    border-radius: 50%;
    min-height: 40px;
    width: 40px;
}

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

/* Navigation tabs */
.nav-tabs {
    display: flex;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 73px; /* Height of header */
    z-index: 99;
}

.nav-tab {
    flex: 1;
    padding: var(--spacing-md);
    background-color: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.nav-tab:hover {
    background-color: var(--background-color);
}

.nav-tab i {
    font-size: 1.2rem;
}

.nav-tab span {
    font-size: 0.9rem;
}

/* Tab content */
.tab-content {
    display: none;
    flex: 1;
    padding: var(--spacing-lg);
}

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

.tab-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.tab-header h2 {
    font-size: 1.3rem;
    font-weight: 600;
}

/* Search and filter */
.search-container {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.search-input {
    flex: 1;
}

.filter-select {
    min-width: 150px;
}

/* Items grid */
.items-grid {
    display: grid;
    gap: var(--spacing-md);
    grid-template-columns: 1fr;
}

/* Item cards */
.item-card {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.recipe-card {
    cursor: pointer;
}

.item-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.item-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    flex: 1;
    margin-right: var(--spacing-sm);
}

.category-badge, .servings-badge {
    background-color: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    white-space: nowrap;
}

.servings-badge {
    background-color: var(--secondary-color);
}

.item-details {
    margin-bottom: var(--spacing-md);
}

.item-details p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

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

.unit-cost {
    color: var(--text-tertiary);
}

.recipe-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.stat {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.stat i {
    color: var(--text-tertiary);
}

.recipe-cost {
    margin-bottom: var(--spacing-md);
}

.total-cost {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.cost-per-serving {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--secondary-color);
}

.item-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

.edit-btn, .delete-btn {
    padding: var(--spacing-sm);
    border-radius: 50%;
    min-height: 36px;
    width: 36px;
    background-color: transparent;
}

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

.edit-btn:hover {
    background-color: rgba(0, 122, 255, 0.1);
}

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

.delete-btn:hover {
    background-color: rgba(255, 59, 48, 0.1);
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-tertiary);
}

.empty-state h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-lg);
}

.modal-content {
    background-color: var(--surface-color);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-content.large {
    max-width: 700px;
}

.modal-content.small {
    max-width: 400px;
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.close-btn {
    padding: var(--spacing-sm);
    background-color: transparent;
    color: var(--text-secondary);
    border-radius: 50%;
    min-height: 36px;
    width: 36px;
}

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

.modal-body {
    padding: var(--spacing-lg);
}

/* Forms */
form {
    padding: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Ingredients section */
.ingredients-section {
    margin-bottom: var(--spacing-lg);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.section-header h4 {
    font-size: 1.1rem;
    font-weight: 600;
}

.ingredient-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr auto;
    gap: var(--spacing-sm);
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.ingredient-select, .ingredient-quantity, .ingredient-unit {
    min-height: 44px;
}

.remove-ingredient-btn {
    padding: var(--spacing-sm);
    background-color: var(--danger-color);
    color: white;
    border-radius: 50%;
    min-height: 36px;
    width: 36px;
}

.remove-ingredient-btn:hover {
    background-color: #D70015;
}

/* Recipe detail */
.recipe-detail {
    padding: var(--spacing-lg);
}

.recipe-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--background-color);
    border-radius: var(--border-radius);
}

.meta-item {
    font-size: 0.9rem;
}

.cost-highlight {
    color: var(--secondary-color);
    font-weight: 600;
}

.recipe-section {
    margin-bottom: var(--spacing-lg);
}

.recipe-section h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.ingredients-table {
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.ingredient-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-md);
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.ingredient-row:last-child {
    border-bottom: none;
}

.total-row {
    background-color: var(--surface-color);
    font-weight: 600;
}

.ingredient-name {
    font-weight: 500;
}

.ingredient-quantity {
    color: var(--text-secondary);
    text-align: center;
}

.ingredient-cost {
    color: var(--secondary-color);
    font-weight: 600;
    text-align: right;
}

.instructions {
    line-height: 1.6;
    color: var(--text-primary);
}

/* Error messages */
.error-message {
    color: var(--danger-color);
    font-size: 0.9rem;
    margin-top: var(--spacing-sm);
    text-align: center;
}

/* Toast notifications */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    max-width: 300px;
}

.toast.show {
    transform: translateX(0);
}

.toast-success {
    border-left: 4px solid var(--secondary-color);
}

.toast-error {
    border-left: 4px solid var(--danger-color);
}

.toast-info {
    border-left: 4px solid var(--primary-color);
}

.toast i {
    font-size: 1.1rem;
}

.toast-success i {
    color: var(--secondary-color);
}

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

.toast-info i {
    color: var(--primary-color);
}

/* Responsive design for larger screens */
@media (min-width: 768px) {
    .nav-tab {
        flex-direction: row;
        gap: var(--spacing-sm);
    }
    
    .nav-tab span {
        font-size: 1rem;
    }
    
    .items-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
    
    .search-container {
        max-width: 500px;
    }
    
    .form-row {
        grid-template-columns: 1fr 1fr 1fr;
    }
    
    .ingredient-row {
        grid-template-columns: 3fr 1fr 1fr auto;
    }
}

@media (min-width: 1024px) {
    .tab-content {
        padding: var(--spacing-xl);
    }
    
    .items-grid {
        grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    }
    
    .recipe-meta {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* iOS Safari specific fixes */
@supports (-webkit-touch-callout: none) {
    input, select, textarea {
        -webkit-appearance: none;
        appearance: none;
        border-radius: var(--border-radius);
    }
    
    select {
        background-image: url("data:image/svg+xml;charset=UTF-8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236D6D70' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6,9 12,15 18,9'></polyline></svg>");
        background-repeat: no-repeat;
        background-position: right 12px center;
        background-size: 16px;
        padding-right: 40px;
    }
}