/* ========================================
   FoodCheck - Estilos Modernos
   Replica optimizada y moderna de la app
   ======================================== */

/* Variables CSS - Sistema de diseño */
:root {
    /* Colores principales */
    --color-primary: #10b981;
    --color-primary-dark: #059669;
    --color-primary-light: #34d399;
    --color-secondary: #6366f1;
    --color-accent: #f59e0b;

    /* Colores semánticos */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    /* Colores de macronutrientes */
    --color-protein: #ef4444;
    --color-carbs: #f59e0b;
    --color-fats: #8b5cf6;

    /* Colores neutros */
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;

    /* Sombras */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Radios */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;

    /* Espaciado */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;

    /* Tipografía */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
}

/* Reset y estilos base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Contenedor principal de la app */
.app-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Header
   ======================================== */
.app-header {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-primary);
}

.logo-icon {
    font-size: 2.5rem;
}

.logo-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    font-weight: 500;
}

/* ========================================
   Secciones
   ======================================== */
.section {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    transition: box-shadow var(--transition-normal);
}

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

.section h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.section h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.section h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.section-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

/* ========================================
   Sección de Perfil
   ======================================== */
.perfil-section {
    background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
    margin-bottom: var(--spacing-md);
}

.section-header h2 {
    margin-bottom: 0;
}

.btn-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    color: var(--color-text-secondary);
    transition: transform var(--transition-normal), color var(--transition-normal);
}

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

.btn-toggle[aria-expanded="true"] .toggle-icon {
    transform: rotate(180deg);
}

.toggle-icon {
    display: inline-block;
    transition: transform var(--transition-normal);
    font-size: var(--font-size-sm);
}

.section-content {
    overflow: hidden;
    transition: max-height var(--transition-slow), opacity var(--transition-slow);
}

.section-content.collapsed {
    max-height: 0;
    opacity: 0;
}

.section-content:not(.collapsed) {
    max-height: 500px;
    opacity: 1;
}

.conditions-container h3 {
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}

.conditions-hint {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
}

.conditions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.condition-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: var(--spacing-md);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
    transition: all var(--transition-normal);
}

.condition-checkbox:hover {
    border-color: var(--color-primary-light);
}

.condition-checkbox input[type="checkbox"] {
    display: none;
}

.checkbox-custom {
    width: 24px;
    height: 24px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-normal);
    flex-shrink: 0;
}

.condition-checkbox input[type="checkbox"]:checked + .checkbox-custom {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.condition-checkbox input[type="checkbox"]:checked + .checkbox-custom::after {
    content: '✓';
    color: white;
    font-weight: bold;
    font-size: var(--font-size-sm);
}

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

.privacy-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

/* ========================================
   Sección de Análisis
   ======================================== */
.analysis-section {
    background: var(--color-surface);
}

.upload-container {
    text-align: center;
}

.upload-area {
    border: 3px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    cursor: pointer;
    transition: all var(--transition-normal);
    background: var(--color-bg);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--color-primary);
    background: #ecfdf5;
}

.upload-area.dragover {
    transform: scale(1.02);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.upload-text {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.upload-hint {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.upload-formats {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.btn-upload {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.btn-upload:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-icon {
    font-size: 1.2em;
}

/* Preview */
.preview-container {
    margin-top: var(--spacing-lg);
    position: relative;
}

.preview-wrapper {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

#image-preview {
    width: 100%;
    max-height: 400px;
    object-fit: contain;
    display: block;
}

.btn-close-preview {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: rgba(0, 0, 0, 0.6);
    color: white;
    border: none;
    cursor: pointer;
    font-size: var(--font-size-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    z-index: 10;
}

.btn-close-preview:hover {
    background: var(--color-error);
    transform: scale(1.1);
}

.preview-info {
    text-align: center;
    padding: var(--spacing-sm);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ========================================
   Detección de Alimentos
   ======================================== */
.detection-result {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--color-border);
}

.detection-header h3 {
    color: var(--color-primary-dark);
}

.detection-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.foods-list {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    min-height: 100px;
    margin-bottom: var(--spacing-lg);
}

.food-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.food-item:hover {
    border-color: var(--color-primary-light);
}

.food-info {
    flex: 1;
}

.food-name {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.food-details {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.food-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-icon-action {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    font-size: var(--font-size-base);
}

.btn-icon-action:hover {
    background: var(--color-bg);
    border-color: var(--color-primary);
}

.btn-icon-action.delete:hover {
    background: #fef2f2;
    border-color: var(--color-error);
    color: var(--color-error);
}

.empty-state {
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--spacing-xl);
    font-style: italic;
}

/* Selector de aceite */
.oil-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

.oil-selector label {
    font-weight: 500;
    color: var(--color-text);
}

.oil-input-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.oil-input-group input {
    width: 70px;
    padding: var(--spacing-sm);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    text-align: center;
    transition: border-color var(--transition-fast);
}

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

.oil-unit {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* Botones de acción */
.btn-add-food,
.btn-save-meal {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    width: 100%;
    margin-bottom: var(--spacing-md);
}

.btn-add-food {
    background: var(--color-surface);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-add-food:hover {
    background: #ecfdf5;
}

.btn-save-meal {
    background: var(--color-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-save-meal:hover {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-lg);
}

.save-hint {
    text-align: center;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* ========================================
   Resumen Nutricional
   ======================================== */
.nutrition-section {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
}

.nutrition-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.nutrition-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
}

.nutrition-card:hover {
    transform: translateY(-4px);
}

.nutrition-card.protein {
    border-top: 4px solid var(--color-protein);
}

.nutrition-card.carbs {
    border-top: 4px solid var(--color-carbs);
}

.nutrition-card.fats {
    border-top: 4px solid var(--color-fats);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.card-icon {
    font-size: 1.5rem;
}

.card-header h3 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
}

.card-value {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.card-value .value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text);
}

.nutrition-card.protein .card-value .value {
    color: var(--color-protein);
}

.nutrition-card.carbs .card-value .value {
    color: var(--color-carbs);
}

.nutrition-card.fats .card-value .value {
    color: var(--color-fats);
}

.card-value .unit {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.card-bar {
    height: 6px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.nutrition-card.protein .bar-fill {
    background: linear-gradient(90deg, var(--color-protein), #fca5a5);
}

.nutrition-card.carbs .bar-fill {
    background: linear-gradient(90deg, var(--color-carbs), #fcd34d);
}

.nutrition-card.fats .bar-fill {
    background: linear-gradient(90deg, var(--color-fats), #a78bfa);
}

/* Detalles nutricionales */
.nutrition-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.detail-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.detail-item:last-child {
    border-bottom: none;
}

.detail-label {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

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

/* ========================================
   Asistente Dietista
   ======================================== */
.assistant-section {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
}

.assistant-content {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.assistant-placeholder {
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--spacing-lg);
}

.assistant-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.suggestion-item {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.suggestion-item.positive {
    background: #ecfdf5;
    border-left: 4px solid var(--color-success);
}

.suggestion-item.negative {
    background: #fef2f2;
    border-left: 4px solid var(--color-error);
}

.suggestion-item.warning {
    background: #fffbeb;
    border-left: 4px solid var(--color-warning);
}

.suggestion-item.info {
    background: #eff6ff;
    border-left: 4px solid var(--color-info);
}

.suggestion-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

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

.disclaimer {
    background: rgba(0, 0, 0, 0.05);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.disclaimer p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    text-align: center;
    font-style: italic;
}

/* ========================================
   Registro Diario
   ======================================== */
.register-section {
    background: var(--color-surface);
}

.daily-summary {
    margin-bottom: var(--spacing-lg);
}

.btn-reset-day {
    display: block;
    margin: 0 auto var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-reset-day:hover {
    background: #fef2f2;
    color: var(--color-error);
    border-color: var(--color-error);
}

.daily-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.daily-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    border: 2px solid var(--color-border);
}

.daily-card .card-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.daily-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text);
}

.daily-unit {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.register-placeholder {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-muted);
}

.register-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.meals-list {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--color-border);
}

.meal-entry {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.meal-info {
    flex: 1;
}

.meal-name {
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.meal-macros {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.meal-time {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

/* ========================================
   Footer
   ======================================== */
.app-footer {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    margin-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.footer-text {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

.privacy-text {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}

/* ========================================
   Modal
   ======================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    z-index: 1000;
    backdrop-filter: blur(4px);
    animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

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

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

.modal-header h3 {
    margin-bottom: 0;
}

.btn-close-modal {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--color-bg);
    border: none;
    cursor: pointer;
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.btn-close-modal:hover {
    background: #fef2f2;
    color: var(--color-error);
}

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

.modal-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

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

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

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast);
}

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

.btn-search-food {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md);
    background: var(--color-surface);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-bottom: var(--spacing-lg);
}

.btn-search-food:hover {
    background: #ecfdf5;
}

.search-results {
    margin-bottom: var(--spacing-lg);
}

.search-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.results-list {
    max-height: 200px;
    overflow-y: auto;
}

.result-item {
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.result-item:hover {
    border-color: var(--color-primary);
    background: #ecfdf5;
}

.result-item.selected {
    border-color: var(--color-primary);
    background: #ecfdf5;
}

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

.result-brand {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

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

.modal-footer {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.btn-cancel,
.btn-save {
    flex: 1;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-cancel {
    background: var(--color-surface);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

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

.btn-save {
    background: var(--color-primary);
    color: white;
    border: none;
}

.btn-save:hover {
    background: var(--color-primary-dark);
}

/* ========================================
   Loading Overlay
   ======================================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    z-index: 2000;
    backdrop-filter: blur(8px);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    color: var(--color-text-secondary);
    font-size: var(--font-size-lg);
    font-weight: 500;
}

/* ========================================
   Toast Notifications
   ======================================== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--color-surface);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 280px;
    max-width: 400px;
    animation: slideInRight var(--transition-normal);
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

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

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

.toast-icon {
    font-size: 1.25rem;
}

.toast-message {
    flex: 1;
    color: var(--color-text);
    font-size: var(--font-size-sm);
}

/* ========================================
   Utilidades
   ======================================== */
.hidden {
    display: none !important;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-sm);
    }

    .logo {
        font-size: var(--font-size-2xl);
    }

    .logo-icon {
        font-size: 2rem;
    }

    .upload-area {
        padding: var(--spacing-xl);
    }

    .upload-icon {
        font-size: 3rem;
    }

    .nutrition-cards {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .nutrition-card {
        display: grid;
        grid-template-columns: 1fr auto;
        grid-template-rows: auto auto;
        gap: var(--spacing-md);
        text-align: left;
    }

    .card-header {
        justify-content: flex-start;
    }

    .card-value {
        justify-content: flex-start;
    }

    .card-bar {
        grid-column: 1 / -1;
    }

    .daily-cards {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

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

    .nutrition-details {
        grid-template-columns: 1fr;
    }

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

    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
        bottom: var(--spacing-md);
    }

    .toast {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .section {
        padding: var(--spacing-md);
    }

    .section h2 {
        font-size: var(--font-size-lg);
    }

    .food-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

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

    .modal {
        margin: var(--spacing-sm);
        max-height: calc(100vh - 2rem);
    }
}

/* ========================================
   Animaciones de entrada
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeInUp var(--transition-slow) backwards;
}

.section:nth-child(2) { animation-delay: 100ms; }
.section:nth-child(3) { animation-delay: 200ms; }
.section:nth-child(4) { animation-delay: 300ms; }
.section:nth-child(5) { animation-delay: 400ms; }
.section:nth-child(6) { animation-delay: 500ms; }

/* Estilos para scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* Selection */
::selection {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
}