/* ===========================
   CSS Reset & Base Styles
   =========================== */

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

:root {
    /* Colors */
    --primary-color: #4A90E2;
    --primary-dark: #357ABD;
    --secondary-color: #6C757D;
    --success-color: #28A745;
    --warning-color: #FFC107;
    --danger-color: #DC3545;
    --light-gray: #F8F9FA;
    --medium-gray: #E9ECEF;
    --dark-gray: #495057;
    --text-color: #212529;

    /* Status Colors */
    --status-safe: #28A745;
    --status-caution: #FFC107;
    --status-avoid: #DC3545;
    --status-unclear: #6C757D;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-base: 16px;
    --line-height: 1.6;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--text-color);
    background-color: var(--light-gray);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===========================
   Layout
   =========================== */

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: var(--spacing-md);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.app-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

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

#main-content {
    flex: 1;
    padding: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
}

.app-footer {
    padding: var(--spacing-md);
    text-align: center;
    background: white;
    border-top: 1px solid var(--medium-gray);
}

.disclaimer {
    font-size: 0.75rem;
    color: var(--secondary-color);
}

/* ===========================
   Screen Management
   =========================== */

.screen {
    animation: fadeIn 0.3s ease-in;
}

.screen.hidden {
    display: none;
}

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

/* ===========================
   Setup Screen
   =========================== */

#setup-screen h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

#setup-screen > p {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-lg);
}

.allergen-selection {
    margin-bottom: var(--spacing-lg);
}

.allergen-selection h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.allergen-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.allergen-checkbox {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: white;
    border: 2px solid var(--medium-gray);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
}

.allergen-checkbox:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.allergen-checkbox input[type="checkbox"] {
    margin-top: 2px;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.allergen-checkbox input[type="checkbox"]:checked {
    accent-color: var(--primary-color);
}

.allergen-info {
    flex: 1;
}

.allergen-info strong {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
}

.allergen-description {
    font-size: 0.9rem;
    color: var(--dark-gray);
}

/* ===========================
   Scan Screen
   =========================== */

.selected-allergens-display {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.selected-allergens-display h3 {
    font-size: 0.9rem;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

.allergen-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.allergen-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--primary-color);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
}

.scan-area {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.scan-area h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
}

.scan-area > p {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-sm);
}

.scan-tip {
    background: #E3F2FD;
    border-left: 4px solid var(--primary-color);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--dark-gray);
}

.scan-tip strong {
    color: var(--primary-color);
}

/* Camera & Image Preview */
.camera-container,
.image-preview-container {
    margin-bottom: var(--spacing-md);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--dark-gray);
}

.camera-container video,
.image-preview-container img {
    width: 100%;
    height: auto;
    display: block;
}

/* ===========================
   Buttons
   =========================== */

.button-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: var(--shadow-md);
}

.btn-primary:active {
    transform: scale(0.98);
}

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

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

.btn-text {
    background: transparent;
    color: var(--primary-color);
    padding: var(--spacing-xs);
    text-decoration: underline;
    font-size: 0.9rem;
}

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

.btn-large {
    font-size: 1.1rem;
    padding: var(--spacing-md) var(--spacing-xl);
    min-height: 56px;
}

.btn svg {
    width: 24px;
    height: 24px;
}

/* ===========================
   Results Screen
   =========================== */

.status-card {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.status-safe {
    background: linear-gradient(135deg, #d4edda, #c3e6cb);
    border: 2px solid var(--status-safe);
}

.status-caution {
    background: linear-gradient(135deg, #fff3cd, #ffeaa7);
    border: 2px solid var(--status-caution);
}

.status-avoid {
    background: linear-gradient(135deg, #f8d7da, #f5c6cb);
    border: 2px solid var(--status-avoid);
}

.status-unclear {
    background: linear-gradient(135deg, #e2e3e5, #d6d8db);
    border: 2px solid var(--status-unclear);
}

.status-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.status-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
}

.status-message {
    font-size: 1.1rem;
    color: var(--dark-gray);
}

.image-quality-note {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.7);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

/* Flagged Ingredients */
.flagged-list {
    margin-bottom: var(--spacing-lg);
}

.flagged-list h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
}

.flagged-item {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    border-left: 4px solid;
    box-shadow: var(--shadow-sm);
}

.confidence-confirmed {
    border-left-color: var(--danger-color);
}

.confidence-likely {
    border-left-color: var(--warning-color);
}

.confidence-possible {
    border-left-color: #FDD835;
}

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

.ingredient-name {
    font-size: 1.05rem;
    color: var(--text-color);
}

.confidence-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    background: var(--light-gray);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.flagged-details {
    font-size: 0.9rem;
}

.allergen-category {
    color: var(--dark-gray);
    margin-bottom: var(--spacing-xs);
}

.explanation {
    color: var(--secondary-color);
}

.no-flags {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.no-flags h3 {
    color: var(--success-color);
    margin-bottom: var(--spacing-sm);
}

/* All Ingredients */
.ingredients-section {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.ingredients-section h3 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.ingredient-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.ingredient-chip {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--light-gray);
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.ingredient-chip.flagged {
    background: #FEE;
    border-color: var(--danger-color);
    font-weight: 600;
}

.no-ingredients {
    color: var(--secondary-color);
    font-style: italic;
}

/* ===========================
   Extracted Text Section
   =========================== */

.extracted-text-section {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary-color);
}

.extracted-text-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.extracted-text-header h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
}

.confidence-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.confidence-badge.high {
    background-color: #d4edda;
    color: #155724;
}

.confidence-badge.medium {
    background-color: #fff3cd;
    color: #856404;
}

.confidence-badge.low {
    background-color: #f8d7da;
    color: #721c24;
}

.confidence-badge.user-edited {
    background-color: #d1ecf1;
    color: #0c5460;
}

.extracted-text-content {
    background: var(--light-gray);
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.extracted-text-content p {
    margin: 0 0 var(--spacing-md) 0;
    line-height: 1.6;
    font-size: 0.9rem;
    color: var(--text-color);
    word-wrap: break-word;
    white-space: pre-wrap;
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.85rem;
    min-height: auto;
}

/* When extracted text section is empty or hidden */
.extracted-text-section.hidden {
    display: none;
}

/* ===========================
   Loading Overlay
   =========================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.loading-overlay.hidden {
    display: none;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

#loading-text {
    color: white;
    margin-top: var(--spacing-md);
    font-size: 1.1rem;
}

/* ===========================
   Crop Overlay
   =========================== */

.crop-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.95);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
}

.crop-overlay.hidden {
    display: none;
}

.crop-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-sm);
    max-height: 100vh;
    overflow: hidden;
}

.crop-header {
    color: white;
    text-align: center;
    padding: var(--spacing-md) 0;
}

.crop-header h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.crop-header p {
    font-size: 0.95rem;
    opacity: 0.9;
    font-weight: 400;
}

.crop-canvas-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
}

#crop-canvas {
    max-width: 100%;
    max-height: 100%;
    display: block;
    position: relative;
}

.crop-box {
    position: absolute;
    border: 3px solid #4A90E2;
    background: rgba(74, 144, 226, 0.15);
    box-shadow:
        0 0 0 9999px rgba(0, 0, 0, 0.6),
        0 0 20px rgba(74, 144, 226, 0.4),
        inset 0 0 0 1px rgba(255, 255, 255, 0.3);
    cursor: move;
    touch-action: none;
    z-index: 100;
    min-width: 50px;
    min-height: 50px;
    transition: box-shadow 0.2s ease;
}

.crop-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border: 1px dashed rgba(255, 255, 255, 0.5);
    pointer-events: none;
}

.crop-handle {
    position: absolute;
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, #4A90E2, #357ABD);
    border: 3px solid white;
    border-radius: 50%;
    touch-action: none;
    z-index: 101;
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.3),
        0 0 0 4px rgba(74, 144, 226, 0.2);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.crop-handle:active {
    transform: scale(1.1);
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.4),
        0 0 0 6px rgba(74, 144, 226, 0.3);
}

.crop-handle-nw {
    top: -22px;
    left: -22px;
    cursor: nw-resize;
}

.crop-handle-ne {
    top: -22px;
    right: -22px;
    cursor: ne-resize;
}

.crop-handle-sw {
    bottom: -22px;
    left: -22px;
    cursor: sw-resize;
}

.crop-handle-se {
    bottom: -22px;
    right: -22px;
    cursor: se-resize;
}

.crop-controls {
    padding: var(--spacing-md) 0;
    display: flex;
    gap: var(--spacing-sm);
}

.crop-controls .btn {
    flex: 1;
}

/* ===========================
   Utility Classes
   =========================== */

.hidden {
    display: none !important;
}

/* ===========================
   Responsive Design
   =========================== */

@media (min-width: 768px) {
    .app-header h1 {
        font-size: 2rem;
    }

    #main-content {
        padding: var(--spacing-lg);
    }

    .button-group {
        flex-direction: row;
    }

    .btn-large {
        flex: 1;
    }

    .scan-area h2 {
        font-size: 1.75rem;
    }

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

@media (min-width: 1024px) {
    #main-content {
        padding: var(--spacing-xl);
    }
}

/* ===========================
   Print Styles
   =========================== */

@media print {
    .app-header,
    .app-footer,
    .button-group,
    .btn {
        display: none;
    }

    #results-screen {
        page-break-inside: avoid;
    }
}

/* ===========================
   PWA iOS Specific
   =========================== */

@supports (-webkit-touch-callout: none) {
    body {
        /* Account for iOS safe areas */
        padding-top: env(safe-area-inset-top);
        padding-bottom: env(safe-area-inset-bottom);
    }
}