/*
 * ASTA-inspired Design System
 * Minimalist, monospace, grid-based layout
 * Scan Chinese - scanchinese.com
 */

:root {
    --char-width: 1ch;
    --base-spacing: calc(var(--char-width) * 2);
    --grid-columns: 12;

    /* Light mode colors (default) */
    --bg-color: #ffffff;
    --bg-secondary: #f9f9f9;
    --text-color: #000000;
    --text-secondary: #666666;
    --accent-color: #333333;
    --border-color: #cccccc;
    --border-strong: #000000;
    --success-color: #28a745;
    --error-color: #dc3545;
    --info-color: #17a2b8;
    --overlay-bg: rgba(0, 0, 0, 0.5);
    --code-bg: rgba(0, 0, 0, 0.05);
    --comparison-selected: rgba(0, 0, 0, 0.05);
    --canvas-bg: #ffffff;

    /* Status message backgrounds (light mode) */
    --success-bg: #d4edda;
    --success-text: #155724;
    --error-bg: #f8d7da;
    --error-text: #721c24;
    --info-bg: #d1ecf1;
    --info-text: #0c5460;
}

/* Dark mode colors */
[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --text-color: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent-color: #cccccc;
    --border-color: #444444;
    --border-strong: #666666;
    --success-color: #4ade80;
    --error-color: #f87171;
    --info-color: #38bdf8;
    --overlay-bg: rgba(0, 0, 0, 0.8);
    --code-bg: rgba(255, 255, 255, 0.05);
    --comparison-selected: rgba(255, 255, 255, 0.05);
    --canvas-bg: #2a2a2a;

    /* Status message backgrounds (dark mode) */
    --success-bg: #1e3a28;
    --success-text: #4ade80;
    --error-bg: #3a1e23;
    --error-text: #f87171;
    --info-bg: #1e2a3a;
    --info-text: #38bdf8;
}

/* Auto mode - follows system preference */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-color: #1a1a1a;
        --bg-secondary: #2a2a2a;
        --text-color: #e0e0e0;
        --text-secondary: #a0a0a0;
        --accent-color: #cccccc;
        --border-color: #444444;
        --border-strong: #666666;
        --success-color: #4ade80;
        --error-color: #f87171;
        --info-color: #38bdf8;
        --overlay-bg: rgba(0, 0, 0, 0.8);
        --code-bg: rgba(255, 255, 255, 0.05);
        --comparison-selected: rgba(255, 255, 255, 0.05);
        --canvas-bg: #2a2a2a;

        /* Status message backgrounds (dark mode) */
        --success-bg: #1e3a28;
        --success-text: #4ade80;
        --error-bg: #3a1e23;
        --error-text: #f87171;
        --info-bg: #1e2a3a;
        --info-text: #38bdf8;
    }
}

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

body {
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: var(--base-spacing);
    max-width: 1200px;
    margin: 0 auto;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    margin-bottom: var(--base-spacing);
    letter-spacing: -0.02em;
}

h1 {
    font-size: 2em;
    border-bottom: 2px solid var(--border-strong);
    padding-bottom: calc(var(--base-spacing) / 2);
    margin-bottom: calc(var(--base-spacing) * 2);
}

h2 {
    font-size: 1.5em;
    margin-top: calc(var(--base-spacing) * 2);
}

h3 {
    font-size: 1.2em;
}

p {
    margin-bottom: var(--base-spacing);
}

/* Grid System */
.container {
    width: 100%;
    padding: 0 var(--base-spacing);
}

.grid {
    display: grid;
    grid-template-columns: repeat(var(--grid-columns), 1fr);
    gap: var(--base-spacing);
    margin-bottom: var(--base-spacing);
}

.col-12 { grid-column: span 12; }
.col-6 { grid-column: span 6; }
.col-4 { grid-column: span 4; }
.col-3 { grid-column: span 3; }

/* Buttons */
button, .btn {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    padding: calc(var(--base-spacing) / 2) var(--base-spacing);
    background-color: var(--text-color);
    color: var(--bg-color);
    border: 2px solid var(--border-strong);
    cursor: pointer;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
    margin-right: calc(var(--base-spacing) / 2);
    margin-bottom: calc(var(--base-spacing) / 2);
}

button:hover, .btn:hover {
    background-color: var(--bg-color);
    color: var(--text-color);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

button.secondary {
    background-color: var(--bg-color);
    color: var(--text-color);
}

button.secondary:hover {
    background-color: var(--text-color);
    color: var(--bg-color);
}

/* Input Fields */
input, select, textarea {
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    padding: calc(var(--base-spacing) / 2);
    border: 2px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    width: 100%;
    margin-bottom: var(--base-spacing);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--text-color);
}

/* Cards/Panels */
.card {
    border: 2px solid var(--border-strong);
    padding: var(--base-spacing);
    margin-bottom: var(--base-spacing);
    background-color: var(--bg-color);
}

.card-title {
    font-weight: 700;
    margin-bottom: var(--base-spacing);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: calc(var(--base-spacing) / 2);
}

/* Video/Camera */
#video-container {
    position: relative;
    width: 100%;
    border: 2px solid var(--border-strong);
    margin-bottom: var(--base-spacing);
    background-color: #000;
    aspect-ratio: 4 / 3;
    max-height: 60vh;
    overflow: hidden;
}

#video, #canvas {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

#canvas {
    display: none;
}

/* Results Display */
.result-section {
    border: 2px solid var(--border-color);
    padding: var(--base-spacing);
    margin-bottom: var(--base-spacing);
    min-height: 100px;
}

.result-section.active {
    border-color: var(--text-color);
}

.result-label {
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.8em;
    letter-spacing: 0.1em;
    margin-bottom: calc(var(--base-spacing) / 2);
    color: var(--accent-color);
}

.result-content {
    font-size: 1.2em;
    line-height: 1.8;
    word-break: break-word;
}

/* Chinese text styling */
.chinese-text {
    font-size: 2em;
    line-height: 1.6;
    font-weight: 500;
}

.pinyin-text {
    font-size: 1.2em;
    color: var(--text-secondary);
}

.english-text {
    font-size: 1em;
}

/* Toggle Switch */
.toggle-container {
    display: flex;
    align-items: center;
    gap: var(--base-spacing);
    margin-bottom: var(--base-spacing);
}

.toggle-label {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.8em;
    letter-spacing: 0.1em;
}

/* Loading State */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '...';
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

/* Status Messages */
.status {
    padding: var(--base-spacing);
    margin-bottom: var(--base-spacing);
    border: 2px solid var(--border-color);
    font-weight: 600;
    border-radius: 4px;
    font-size: 0.9em;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

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

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

/* Audio Controls */
.audio-controls {
    display: flex;
    gap: var(--base-spacing);
    margin-top: var(--base-spacing);
}

/* Comparison Mode */
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--base-spacing);
}

.comparison-item {
    border: 2px solid var(--border-color);
    padding: var(--base-spacing);
}

.comparison-item.selected {
    border-color: var(--border-strong);
    background-color: var(--comparison-selected);
}

/* Responsive Design */
@media (max-width: 768px) {
    .grid {
        grid-template-columns: 1fr;
    }

    .col-12, .col-6, .col-4, .col-3 {
        grid-column: span 1;
    }

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

    body {
        font-size: 12px;
    }
}

/* Pre/Code blocks */
pre, code {
    font-family: 'JetBrains Mono', monospace;
    background-color: var(--code-bg);
    padding: var(--base-spacing);
    border: 1px solid var(--border-color);
    overflow-x: auto;
}

/* Hide elements */
.hidden {
    display: none !important;
}

/* Utility classes */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--base-spacing); }
.mt-2 { margin-top: calc(var(--base-spacing) * 2); }
.mb-1 { margin-bottom: var(--base-spacing); }
.mb-2 { margin-bottom: calc(var(--base-spacing) * 2); }

/* Tab Navigation - Connected Tab Design */
.tab-container {
    display: flex;
    margin-bottom: 0;
}

.tab-btn {
    flex: 1;
    padding: 1rem 0.5rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    border-bottom: none;
    font-weight: 700;
    font-size: 0.9em;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    margin: 0;
    text-transform: uppercase;
}

/* Remove double borders between tabs */
.tab-btn:not(:first-child) {
    border-left: none;
}

.tab-btn:hover:not(.active) {
    background: var(--bg-color);
    color: var(--text-color);
}

.tab-btn.active {
    background: var(--bg-color);
    color: var(--text-color);
    border-bottom: 2px solid var(--bg-color);
    margin-bottom: -2px;
    z-index: 2;
}

/* Tab Content Area - Bordered container */
.tab-content-area {
    border: 2px solid var(--border-color);
    border-top: none;
    padding: 1.5rem;
    background: var(--bg-color);
}

.tab-content {
    animation: fadeIn 0.3s ease;
}

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

/* Drawing Canvas */
#drawing-canvas {
    display: block;
    margin: 0 auto;
}

/* Recognition Results */
#recognition-results {
    margin-top: 1rem;
}

#recognition-candidates button {
    min-width: 60px;
}