/* CSS Variables para temas Claro y Oscuro */
:root {
    /* Tema Claro (Por defecto) */
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    
    /* Semáforo - Claro */
    --status-safe-bg: #dcfce7;
    --status-safe-text: #166534;
    --status-safe-border: #bbf7d0;
    
    --status-warning-bg: #fef9c3;
    --status-warning-text: #854d0e;
    --status-warning-border: #fef08a;
    
    --status-danger-bg: #fee2e2;
    --status-danger-text: #991b1b;
    --status-danger-border: #fecaca;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
}

[data-theme="dark"] {
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    
    /* Semáforo - Oscuro */
    --status-safe-bg: rgba(22, 101, 52, 0.3);
    --status-safe-text: #4ade80;
    --status-safe-border: rgba(74, 222, 128, 0.2);
    
    --status-warning-bg: rgba(133, 77, 14, 0.3);
    --status-warning-text: #facc15;
    --status-warning-border: rgba(250, 204, 21, 0.2);
    
    --status-danger-bg: rgba(153, 27, 27, 0.3);
    --status-danger-text: #f87171;
    --status-danger-border: rgba(248, 113, 113, 0.2);
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    max-width: 600px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    padding: 1.5rem 1.25rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background-color: var(--bg-main);
    z-index: 10;
    backdrop-filter: blur(8px);
    background-color: color-mix(in srgb, var(--bg-main) 85%, transparent);
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

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

.icon-button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, color 0.2s;
}

.icon-button:hover {
    background-color: var(--bg-card);
    color: var(--text-primary);
}

/* Main Content */
.main-content {
    padding: 0 1.25rem 2rem;
    flex: 1;
}

/* Search */
.search-container {
    margin-bottom: 1rem;
}

.search-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 1rem;
    color: var(--text-secondary);
}

#search-input {
    width: 100%;
    padding: 1rem 3rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    box-shadow: var(--shadow-sm);
    transition: border-color 0.2s, box-shadow 0.2s;
}

#search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary-color) 20%, transparent);
}

.clear-button {
    position: absolute;
    right: 1rem;
    background: var(--border-color);
    border: none;
    border-radius: var(--radius-full);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    cursor: pointer;
}

.hidden {
    display: none !important;
}

/* Filters */
.filters {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 1rem;
    scrollbar-width: none; /* Firefox */
}
.filters::-webkit-scrollbar {
    display: none; /* Chrome */
}

.filter-chip {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s;
}

.filter-chip.active {
    background-color: var(--text-primary);
    color: var(--bg-main);
    border-color: var(--text-primary);
}

/* Results Grid */
.results-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.food-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s;
    animation: fadeIn 0.3s ease-out;
}

.food-card:active {
    transform: scale(0.98);
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.food-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.food-category {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid;
}

.status-safe {
    background-color: var(--status-safe-bg);
    color: var(--status-safe-text);
    border-color: var(--status-safe-border);
}

.status-warning {
    background-color: var(--status-warning-bg);
    color: var(--status-warning-text);
    border-color: var(--status-warning-border);
}

.status-danger {
    background-color: var(--status-danger-bg);
    color: var(--status-danger-text);
    border-color: var(--status-danger-border);
}

.card-details {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
}

.detail-item {
    display: flex;
    flex-direction: column;
}

.detail-label {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.detail-value {
    font-weight: 500;
    color: var(--text-primary);
}

.card-notes {
    font-size: 0.875rem;
    color: var(--text-secondary);
    background-color: var(--bg-main);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    border-left: 3px solid var(--border-color);
}

.status-safe .card-notes { border-left-color: var(--status-safe-text); }
.status-warning .card-notes { border-left-color: var(--status-warning-text); }
.status-danger .card-notes { border-left-color: var(--status-danger-text); }

/* Empty State / Loading */
.empty-state, .loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1rem;
    text-align: center;
    color: var(--text-secondary);
}

.empty-state svg {
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

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

/* Install Prompt */
.install-prompt {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -4px 6px -1px rgb(0 0 0 / 0.1);
    z-index: 50;
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.install-prompt.show {
    transform: translateY(0);
}

.install-content {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.install-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

.btn-primary, .btn-text {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    border: none;
}

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

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

/* Login Overlay */
.login-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-main);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
}

.login-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-md);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
}

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

.login-btn {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    margin-top: 1rem;
}

.login-error {
    color: var(--status-danger-text);
    background-color: var(--status-danger-bg);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    text-align: center;
}

/* Floating Action Buttons */
.fab-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    z-index: 40;
}

.fab {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    transition: transform 0.2s;
    color: white;
}

.fab:hover {
    transform: scale(1.05);
}

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

.fab-secondary {
    background-color: #8b5cf6;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    opacity: 1;
    transition: opacity 0.2s;
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.form-row {
    display: flex;
    gap: 1rem;
}

.form-row .form-group {
    flex: 1;
}

select {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
}

textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
}

.modal-actions {
    margin-top: 2rem;
    display: flex;
    justify-content: flex-end;
}

/* Scanner */
.scan-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.manual-barcode {
    text-align: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.manual-barcode p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.scan-result-card {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-top: 1rem;
}

.btn-delete {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    opacity: 0.6;
}

.btn-delete:hover {
    color: var(--status-danger-text);
    background-color: var(--status-danger-bg);
    opacity: 1;
}

.web-search-persistent {
    padding: 0.5rem 0 2rem;
    animation: fadeIn 0.4s ease-out;
}