/* Mobile-First CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2196F3;
    --primary-dark: #1976D2;
    --secondary-color: #FF9800;
    --success-color: #4CAF50;
    --danger-color: #F44336;
    --warning-color: #FF9800;
    --background-color: #FAFAFA;
    --surface-color: #FFFFFF;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #E0E0E0;
    --shadow: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-heavy: 0 8px 24px rgba(0,0,0,0.15);
    --border-radius: 8px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    --min-touch-target: 44px;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Layout Utilities */
.hidden {
    display: none !important;
}

.page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    padding: var(--spacing-md);
    flex: 1;
    max-width: 100%;
}

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

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

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

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

.header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    flex: 1;
    text-align: center;
}

.header-actions {
    display: flex;
    gap: 8px;
}

#debug-btn {
    opacity: 0.7;
    transition: all 0.3s ease;
}

#debug-btn:hover {
    opacity: 1;
}

#debug-btn.active {
    background-color: #2196F3;
    color: white;
    opacity: 1;
}

/* Buttons - Base styles applied to all button types */
.icon-btn {
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1.2rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--min-touch-target);
    min-width: var(--min-touch-target);
    gap: var(--spacing-xs);
    background: transparent;
    color: var(--text-primary);
    padding: var(--spacing-sm);
}

.icon-btn:hover, .icon-btn:focus {
    background: rgba(0,0,0,0.05);
    outline: none;
}

.primary-btn {
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--min-touch-target);
    min-width: var(--min-touch-target);
    gap: var(--spacing-xs);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    width: 100%;
}

.primary-btn:hover, .primary-btn:focus {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
    outline: none;
}

.secondary-btn {
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--min-touch-target);
    min-width: var(--min-touch-target);
    gap: var(--spacing-xs);
    background: var(--surface-color);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: var(--spacing-md) var(--spacing-lg);
    width: 100%;
}

.secondary-btn:hover, .secondary-btn:focus {
    background: var(--primary-color);
    color: white;
    outline: none;
}

.danger-btn {
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--min-touch-target);
    min-width: var(--min-touch-target);
    gap: var(--spacing-xs);
    background: var(--danger-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
}

.danger-btn:hover, .danger-btn:focus {
    background: #d32f2f;
    outline: none;
}

.danger-btn-small {
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--min-touch-target);
    min-width: var(--min-touch-target);
    gap: var(--spacing-xs);
    background: transparent;
    color: var(--danger-color);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--danger-color);
}

.danger-btn-small:hover, .danger-btn-small:focus {
    background: var(--danger-color);
    color: white;
    outline: none;
}

.add-btn {
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--min-touch-target);
    min-width: var(--min-touch-target);
    gap: var(--spacing-xs);
    background: var(--success-color);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    white-space: nowrap;
}

.add-btn:hover, .add-btn:focus {
    background: #388e3c;
    outline: none;
}

.delete-btn {
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1.2rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--min-touch-target);
    min-width: var(--min-touch-target);
    gap: var(--spacing-xs);
    background: transparent;
    color: var(--danger-color);
    padding: var(--spacing-sm);
}

.delete-btn:hover, .delete-btn:focus {
    background: rgba(244, 67, 54, 0.1);
    outline: none;
}

.snackbar-action {
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--min-touch-target);
    min-width: var(--min-touch-target);
    gap: var(--spacing-xs);
    background: transparent;
    color: var(--warning-color);
    padding: var(--spacing-sm) var(--spacing-md);
}

.snackbar-action:hover, .snackbar-action:focus {
    background: rgba(255,255,255,0.1);
    outline: none;
}

/* Stats Card */
.stats-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.stats-card span {
    font-weight: 600;
    color: var(--text-secondary);
}

/* Actions Section */
.actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

/* Scan List */
.scan-list-container {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

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

.list-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.scan-list {
    max-height: 60vh;
    overflow-y: auto;
}

.scan-item {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

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

.scan-barcode {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
    flex: 1;
    word-break: break-all;
}

.scan-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: var(--spacing-xs);
}

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

.scan-source {
    font-size: 0.75rem;
    padding: 2px 6px;
    border-radius: 12px;
    background: var(--border-color);
    color: var(--text-secondary);
}

.scan-source.camera {
    background: var(--success-color);
    color: white;
}

.scan-source.manual {
    background: var(--warning-color);
    color: white;
}

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

/* Camera Section */
.camera-section {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.camera-container {
    background: #000;
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
    aspect-ratio: 4/3;
    width: 100%;
    cursor: crosshair; /* Indicate tap-to-focus capability */
}

#camera-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #000;
}

.camera-error {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.8);
    color: white;
    gap: var(--spacing-md);
}

/* Enhanced camera targeting and focus styles */
.barcode-targeting-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 10;
}

.barcode-target-frame {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 280px;
    height: 120px;
    margin-left: -140px;
    margin-top: -60px;
    border: 2px solid #00ff00;
    border-radius: 8px;
    background: rgba(0, 255, 0, 0.05);
    animation: scannerPulse 2s ease-in-out infinite;
    box-shadow: 
        0 0 0 1px rgba(0,0,0,0.5),
        inset 0 0 20px rgba(0, 255, 0, 0.1);
}

.corner-indicator {
    position: absolute;
    width: 20px;
    height: 20px;
    border: 3px solid #00ff00;
    animation: cornerBlink 1.5s ease-in-out infinite;
}

.scan-line {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        #00ff00 20%, 
        #ffffff 50%, 
        #00ff00 80%, 
        transparent 100%);
    animation: scanLineSweep 1.5s ease-in-out infinite;
    box-shadow: 0 0 4px rgba(0, 255, 0, 0.6);
}

.barcode-instruction {
    position: absolute;
    bottom: -40px;
    left: 50%;
    transform: translateX(-50%);
    color: #00ff00;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    text-shadow: 0 0 4px rgba(0,0,0,0.8);
    background: rgba(0,0,0,0.7);
    padding: 6px 12px;
    border-radius: 4px;
    border: 1px solid rgba(0, 255, 0, 0.3);
    white-space: nowrap;
}

.focus-indicator {
    position: absolute;
    width: 80px;
    height: 80px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    pointer-events: none;
    opacity: 0;
    transition: all 0.2s ease;
    z-index: 20;
    box-shadow: 
        0 0 0 1px rgba(0,0,0,0.5),
        0 0 10px rgba(255, 255, 255, 0.3);
    animation: focusPulse 0.6s ease-out;
}

/* Animations for targeting system */
@keyframes scannerPulse {
    0%, 100% { 
        border-color: #00ff00; 
        box-shadow: 
            0 0 0 1px rgba(0,0,0,0.5),
            inset 0 0 20px rgba(0, 255, 0, 0.1);
    }
    50% { 
        border-color: #88ff88; 
        box-shadow: 
            0 0 0 1px rgba(0,0,0,0.5),
            inset 0 0 20px rgba(0, 255, 0, 0.3),
            0 0 15px rgba(0, 255, 0, 0.4);
    }
}

@keyframes scanLineSweep {
    0% { 
        transform: translateY(0); 
        opacity: 1; 
    }
    50% { 
        opacity: 1; 
    }
    100% { 
        transform: translateY(116px); 
        opacity: 0; 
    }
}

@keyframes cornerBlink {
    0%, 70%, 100% { 
        opacity: 1; 
    }
    35% { 
        opacity: 0.3; 
    }
}

@keyframes focusPulse {
    0% { 
        transform: scale(1.4); 
        opacity: 0; 
        border-color: #ffffff;
    }
    50% { 
        transform: scale(1.1); 
        opacity: 1; 
        border-color: #00ff00;
    }
    100% { 
        transform: scale(0.9); 
        opacity: 1; 
        border-color: #00ff00;
    }
}

/* Enhanced flashlight button with better visibility */
#flashlight-btn {
    background: rgba(0,0,0,0.7);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.3);
    backdrop-filter: blur(4px);
    transition: all 0.3s ease;
}

#flashlight-btn:hover {
    background: rgba(0,0,0,0.9);
    border-color: rgba(255,255,255,0.6);
    transform: scale(1.05);
}

#flashlight-btn.active {
    background: rgba(255,193,7,0.8);
    color: #000;
    border-color: rgba(255,193,7,0.8);
    text-shadow: none;
}

/* Responsive targeting overlay */
@media (max-width: 480px) {
    .barcode-target-frame {
        width: 240px;
        height: 100px;
        margin-left: -120px;
        margin-top: -50px;
    }
    
    .barcode-instruction {
        font-size: 12px;
        padding: 4px 8px;
        bottom: -35px;
    }
}

/* Scan Feedback */
.scan-feedback {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0,0,0,0.9);
    color: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    z-index: 10;
    animation: feedbackPulse 0.5s ease-out;
}

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

.feedback-code {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 600;
}

@keyframes feedbackPulse {
    0% { 
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.8);
    }
    50% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.1);
    }
    100% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1);
    }
}

/* Manual Entry */
.manual-entry {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
}

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

.input-group {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.input-group input {
    flex: 1;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-family: var(--font-mono);
}

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

.manual-options {
    display: flex;
    gap: var(--spacing-md);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: 0.9rem;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

/* Recent Scans */
.recent-scans {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.recent-scans h3 {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    font-size: 1.1rem;
}

.recent-list {
    max-height: 300px;
    overflow-y: auto;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
}

.modal-content {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    width: 100%;
    max-width: 400px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-heavy);
}

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

.modal-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
}

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

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

.modal-footer .secondary-btn,
.modal-footer .primary-btn,
.modal-footer .danger-btn {
    flex: 1;
}

/* Form Groups */
.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-group input {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
}

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

/* Snackbar */
.snackbar {
    position: fixed;
    bottom: var(--spacing-md);
    left: var(--spacing-md);
    right: var(--spacing-md);
    background: #323232;
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1001;
    animation: snackbarSlide 0.3s ease-out;
}

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

/* Save Indicator */
.save-indicator {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--success-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    z-index: 1001;
    animation: saveIndicator 2s ease-out forwards;
}

@keyframes saveIndicator {
    0% {
        opacity: 0;
        transform: translateX(100%);
    }
    15%, 85% {
        opacity: 1;
        transform: translateX(0);
    }
    100% {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* Responsive Design */
@media (min-width: 768px) {
    .container {
        max-width: 600px;
        margin: 0 auto;
        padding: var(--spacing-lg);
    }
    
    .actions {
        flex-direction: row;
        gap: var(--spacing-md);
    }
    
    .actions .primary-btn,
    .actions .secondary-btn {
        width: auto;
        flex: 1;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #121212;
        --surface-color: #1E1E1E;
        --text-primary: #FFFFFF;
        --text-secondary: #AAAAAA;
        --border-color: #333333;
        --shadow: 0 2px 8px rgba(0,0,0,0.3);
        --shadow-heavy: 0 8px 24px rgba(0,0,0,0.4);
    }
    
    .icon-btn:hover, .icon-btn:focus {
        background: rgba(255,255,255,0.1);
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

button:focus,
input:focus {
    outline: none;
}

/* High Contrast Support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
}

/* Print Styles */
@media print {
    .header,
    .actions,
    .camera-section,
    .manual-entry,
    .modal,
    .snackbar,
    .save-indicator {
        display: none !important;
    }
    
    .scan-list {
        max-height: none;
    }
}