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

:root {
    --bg: #0d0d0d;
    --bg-secondary: #161616;
    --bg-tertiary: #1c1c1c;
    --border: #2a2a2a;
    --text: #e5e5e5;
    --text-muted: #737373;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #22c55e;
    --error: #ef4444;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 48px 24px;
}

header {
    margin-bottom: 48px;
}

h1 {
    font-size: 28px;
    font-weight: 600;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 14px;
}

.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 16px;
}

.card-title {
    font-size: 13px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.help-icon {
    display: inline-block;
    width: 16px;
    height: 16px;
    line-height: 16px;
    text-align: center;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 50%;
    cursor: help;
    margin-left: 4px;
    vertical-align: middle;
    transition: all 0.15s ease;
}

.help-icon:hover {
    color: var(--text);
    background: var(--border);
    border-color: #3a3a3a;
    transform: scale(1.1);
}

.btn-group {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn:hover {
    background: var(--border);
    border-color: #3a3a3a;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

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

.btn-record {
    background: var(--bg-tertiary);
}

.btn-record.recording {
    background: var(--error);
    border-color: var(--error);
    color: #fff;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

@media (max-width: 600px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.stat {
    background: var(--bg-tertiary);
    border-radius: 6px;
    padding: 12px;
}

.stat-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.stat-value {
    font-size: 18px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

canvas {
    width: 100%;
    height: 160px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
}

.canvas-legend {
    display: flex;
    gap: 16px;
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-muted);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.legend-dot.original {
    background: var(--accent);
}

.legend-dot.decoded {
    background: var(--success);
}

.log {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 16px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: 12px;
    line-height: 1.6;
    max-height: 200px;
    overflow-y: auto;
    white-space: pre-wrap;
    color: var(--text-muted);
}

.log .info {
    color: var(--text);
}

.log .success {
    color: var(--success);
}

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

.hidden {
    display: none !important;
}

.metadata-content {
    font-size: 13px;
}

.metadata-content .meta-row {
    display: flex;
    gap: 8px;
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
}

.metadata-content .meta-row:last-child {
    border-bottom: none;
}

.metadata-content .meta-label {
    color: var(--text-muted);
    width: 120px;
    flex-shrink: 0;
}

.metadata-content .meta-value {
    color: var(--text);
}

.metadata-content .cover-art {
    max-width: 120px;
    max-height: 120px;
    border-radius: 4px;
    margin-top: 8px;
}

.metadata-content .sections-list,
.metadata-content .lyrics-preview {
    font-size: 12px;
    color: var(--text-muted);
    background: var(--bg);
    border-radius: 4px;
    padding: 8px;
    margin-top: 4px;
    max-height: 100px;
    overflow-y: auto;
}

.file-input {
    display: none;
}

.metadata-editor {
    margin-top: 0;
}

.metadata-editor.hidden {
    display: none;
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

@media (max-width: 500px) {
    .input-grid {
        grid-template-columns: 1fr;
    }
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.input-group label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.input-group input,
.input-group textarea {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 8px 10px;
    font-size: 13px;
    color: var(--text);
    font-family: inherit;
    transition: border-color 0.15s;
}

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

.input-group input::placeholder,
.input-group textarea::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

.input-group textarea {
    resize: vertical;
    min-height: 60px;
}

.drop-zone {
    border: 2px dashed var(--border);
    border-radius: 6px;
    padding: 32px;
    text-align: center;
    cursor: pointer;
    transition: all 0.15s ease;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.05);
}

.drop-zone p {
    color: var(--text-muted);
    font-size: 14px;
}

.drop-zone span {
    color: var(--accent);
}

.divider {
    height: 1px;
    background: var(--border);
    margin: 24px 0;
}

footer {
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 13px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

footer a {
    color: var(--text);
    text-decoration: none;
}

footer a:hover {
    color: var(--accent);
}

.icon {
    width: 16px;
    height: 16px;
    stroke: currentColor;
    stroke-width: 2;
    fill: none;
}

.encoding-mode {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.mode-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 12px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s;
}

.mode-btn:hover {
    border-color: #3a3a3a;
}

.mode-btn.active {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
}

.mode-btn .mode-name {
    font-size: 14px;
    font-weight: 500;
}

.mode-btn .mode-desc {
    font-size: 11px;
    color: var(--text-muted);
}

.quality-slider {
    margin-top: 12px;
}

.quality-slider label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    display: block;
    margin-bottom: 8px;
}

.quality-slider input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--bg);
    border-radius: 3px;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
}

.quality-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

.quality-labels {
    display: flex;
    justify-content: space-between;
    font-size: 10px;
    color: var(--text-muted);
    margin-top: 4px;
}

.quality-value {
    text-align: center;
    font-size: 13px;
    color: var(--text);
    margin-top: 8px;
}

/* Streaming Demo */
.streaming-info {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.streaming-status {
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 12px;
    font-weight: 500;
}

.status-idle {
    background: var(--bg-tertiary);
    color: var(--text-muted);
}

.status-connecting {
    background: rgba(59, 130, 246, 0.2);
    color: var(--accent);
}

.status-receiving {
    background: rgba(234, 179, 8, 0.2);
    color: #eab308;
}

.status-ready {
    background: rgba(34, 197, 94, 0.2);
    color: var(--success);
}

.status-playing {
    background: rgba(59, 130, 246, 0.3);
    color: var(--accent);
    animation: pulse 1.5s ease-in-out infinite;
}

.status-buffering {
    background: rgba(234, 179, 8, 0.2);
    color: #eab308;
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.status-error {
    background: rgba(239, 68, 68, 0.2);
    color: var(--error);
}

.streaming-progress {
    font-size: 12px;
    color: var(--text-muted);
}

.badge {
    font-size: 10px;
    padding: 2px 6px;
    border-radius: 4px;
    background: var(--accent);
    color: white;
    font-weight: 600;
    margin-left: 8px;
    vertical-align: middle;
}