/**
 * Styles for NATO Phonetic Alphabet Converter
 * Includes responsive layout, dark mode, and accessibility features
 */

:root {
    /* Light mode colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e0e0e0;
    --text-primary: #212121;
    --text-secondary: #757575;
    --border-color: #bdbdbd;
    --accent-color: #1976d2;
    --accent-hover: #1565c0;
    --success-color: #4caf50;
    --error-color: #f44336;
    --flagged-bg: #d32f2f;
    --flagged-text: #ffffff;
    --qr-dark: #000000;
    --qr-light: #ffffff;
    --shadow: rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Touch targets */
    --min-touch-size: 44px;
    
    /* Transitions */
    --transition-speed: 0.3s;
}

/* Dark mode colors */
[data-theme="dark"] {
    --bg-primary: #1e1e1e;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3d3d3d;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --border-color: #505050;
    --accent-color: #64b5f6;
    --accent-hover: #90caf9;
    --success-color: #81c784;
    --error-color: #e57373;
    --flagged-bg: #c62828;
    --flagged-text: #ffffff;
    --qr-dark: #ffffff;
    --qr-light: #1e1e1e;
    --shadow: rgba(0, 0, 0, 0.3);
}

/* Auto dark mode detection */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-primary: #1e1e1e;
        --bg-secondary: #2d2d2d;
        --bg-tertiary: #3d3d3d;
        --text-primary: #e0e0e0;
        --text-secondary: #b0b0b0;
        --border-color: #505050;
        --accent-color: #64b5f6;
        --accent-hover: #90caf9;
        --success-color: #81c784;
        --error-color: #e57373;
        --flagged-bg: #c62828;
        --flagged-text: #ffffff;
        --qr-dark: #ffffff;
        --qr-light: #1e1e1e;
        --shadow: rgba(0, 0, 0, 0.3);
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

h1 {
    font-size: 2rem;
    color: var(--text-primary);
}

h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

/* Dark mode toggle */
.icon-button {
    min-width: var(--min-touch-size);
    min-height: var(--min-touch-size);
    padding: var(--spacing-xs);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.5rem;
    transition: background-color var(--transition-speed);
}

.icon-button:hover {
    background: var(--bg-tertiary);
}

.icon-button:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

[data-theme="light"] .icon-moon,
[data-theme="dark"] .icon-sun {
    display: none;
}

[data-theme="light"] .icon-sun,
[data-theme="dark"] .icon-moon {
    display: inline;
}

/* Sections */
section {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: 0 2px 8px var(--shadow);
}

/* Converter Grid - Responsive */
.converter-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

@media (max-width: 768px) {
    .converter-grid {
        grid-template-columns: 1fr;
    }
}

/* Input/Output Panels */
.input-panel,
.output-panel {
    display: flex;
    flex-direction: column;
}

.input-panel label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--spacing-sm);
}

.char-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

textarea {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 1rem;
    resize: vertical;
    min-height: 200px;
    transition: border-color var(--transition-speed);
}

textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

.output-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.output-header h2 {
    margin: 0;
    flex: 1;
}

.output-display {
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-height: 200px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 1rem;
    word-wrap: break-word;
    line-height: 1.8;
}

/* Flagged characters */
.flagged-char {
    background-color: var(--flagged-bg);
    color: var(--flagged-text);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: bold;
    cursor: help;
}

.unrecognized-info {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--error-color);
    color: white;
    border-radius: 6px;
    font-size: 0.875rem;
    display: none;
}

.unrecognized-info.show {
    display: block;
}

/* Buttons */
.btn {
    min-width: var(--min-touch-size);
    min-height: var(--min-touch-size);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-speed);
    text-align: center;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--border-color);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

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

/* Copy confirmation */
.copy-confirm {
    color: var(--success-color);
    font-weight: 500;
    opacity: 0;
    transition: opacity var(--transition-speed);
}

.copy-confirm.show {
    opacity: 1;
}

/* QR Code Section */
.qr-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.qr-mode-selector {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
}

.qr-mode-selector legend {
    padding: 0 var(--spacing-sm);
    font-weight: 500;
}

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

.radio-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    min-height: var(--min-touch-size);
}

.radio-group input[type="radio"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.qr-display {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 150px;
}

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

.qr-canvas {
    display: inline-block;
    padding: var(--spacing-md);
    background: white;
    border-radius: 8px;
}

.qr-description {
    margin-top: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.qr-message,
.qr-error {
    color: var(--text-secondary);
    font-style: italic;
}

.qr-error {
    color: var(--error-color);
}

/* Batch File Section */
.batch-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.file-upload-wrapper {
    flex: 1;
    min-width: 250px;
}

.file-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-speed);
    min-height: var(--min-touch-size);
}

.file-label:hover {
    border-color: var(--accent-color);
    background: var(--bg-tertiary);
}

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

#fileInput {
    display: none;
}

/* Progress Bar */
.progress-bar {
    position: relative;
    width: 100%;
    height: 40px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.progress-bar.hidden {
    display: none;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-hover));
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: 500;
    color: var(--text-primary);
    mix-blend-mode: difference;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: var(--spacing-md);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: 12px;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 40px var(--shadow);
}

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

.modal-header h2 {
    margin: 0;
}

.modal-close {
    min-width: var(--min-touch-size);
    min-height: var(--min-touch-size);
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color var(--transition-speed);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

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

/* Preview Table */
.preview-table-wrapper {
    overflow-x: auto;
}

.preview-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.preview-table th,
.preview-table td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.preview-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    position: sticky;
    top: 0;
}

.preview-table tr:hover {
    background: var(--bg-secondary);
}

.original-cell {
    font-family: 'Consolas', 'Monaco', monospace;
    color: var(--text-secondary);
}

.phonetic-cell {
    font-family: 'Consolas', 'Monaco', monospace;
    font-weight: 500;
}

.preview-note {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-left: 4px solid var(--accent-color);
    border-radius: 4px;
    font-size: 0.875rem;
}

/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

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

/* Focus visible for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Screen reader only class */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}