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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #1c2333;
    --bg-elevated: #21262d;
    --border: #30363d;
    --border-hover: #484f58;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #484f58;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --accent-glow: rgba(88, 166, 255, 0.15);
    --green: #3fb950;
    --orange: #d29922;
    --red: #f85149;
    --wave-original: #58a6ff;
    --wave-corrected: #3fb950;
    --radius: 8px;
    --radius-sm: 4px;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

html, body {
    height: 100%;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 14px;
    line-height: 1.5;
    overflow: hidden;
}

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

#header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    height: 52px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--accent);
}

.logo h1 {
    font-size: 18px;
    font-weight: 600;
    letter-spacing: -0.3px;
}

.status-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    transition: all 0.2s;
}

.status-badge.ready {
    color: var(--green);
    border-color: var(--green);
}

.status-badge.busy {
    color: var(--orange);
    border-color: var(--orange);
}

.status-badge.done {
    color: var(--accent);
    border-color: var(--accent);
}

#main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

#sidebar {
    width: 280px;
    flex-shrink: 0;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    overflow-y: auto;
}

.panel {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
}

.panel h2 {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 24px 16px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--accent);
    background: var(--accent-glow);
    color: var(--accent);
}

.drop-icon {
    margin-bottom: 8px;
    opacity: 0.6;
}

.drop-zone.dragover .drop-icon {
    opacity: 1;
}

.drop-zone p {
    font-size: 13px;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    width: 100%;
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-elevated);
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    margin-top: 10px;
}

.btn:hover {
    border-color: var(--border-hover);
    background: var(--bg-tertiary);
}

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

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

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

.recording-btn {
    color: var(--red);
    border-color: var(--red);
    background: transparent;
}

.recording-btn:hover {
    background: rgba(248, 81, 73, 0.1);
}

.recording-btn.active {
    background: var(--red);
    color: #fff;
}

.record-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: currentColor;
}

.recording-btn.active .record-dot {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.download-btn {
    background: var(--green);
    border-color: var(--green);
    color: #fff;
}

.download-btn:hover {
    opacity: 0.9;
}

.secondary-btn {
    margin-top: 6px;
    font-size: 12px;
    padding: 6px 12px;
    background: transparent;
    border-color: var(--border);
}

.control-group {
    margin-bottom: 14px;
}

.control-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.value {
    font-family: var(--font-mono);
    color: var(--text-primary);
    font-size: 12px;
}

.slider {
    width: 100%;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-elevated);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-tertiary);
    cursor: pointer;
    transition: 0.1s;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-tertiary);
    cursor: pointer;
}

#content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    min-width: 0;
}

#waveformContainer {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 200px;
}

.wave-label {
    position: absolute;
    top: 12px;
    left: 16px;
    z-index: 2;
    display: flex;
    gap: 16px;
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.3px;
}

.label-original {
    color: var(--wave-original);
}

.label-corrected {
    color: var(--wave-corrected);
}

#waveform {
    flex: 1;
    width: 100%;
    display: block;
    cursor: crosshair;
}

#timeDisplay {
    display: flex;
    justify-content: space-between;
    padding: 8px 16px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
}

#transport {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 4px;
}

.transport-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

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

.transport-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

#progressBar {
    flex: 1;
    height: 4px;
    background: var(--bg-elevated);
    border-radius: 2px;
    cursor: pointer;
    position: relative;
}

#progressFill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.05s linear;
}

#infoBar {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    font-size: 12px;
    color: var(--text-muted);
}

#overlay {
    position: fixed;
    inset: 0;
    background: rgba(13, 17, 23, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    backdrop-filter: blur(4px);
}

#overlay[hidden] {
    display: none !important;
}

#overlayContent {
    text-align: center;
    color: var(--text-primary);
}

#overlayContent p {
    margin-top: 16px;
    font-size: 16px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
}

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

@media (max-width: 768px) {
    #main {
        flex-direction: column;
    }
    #sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border);
        flex-direction: row;
        flex-wrap: wrap;
        padding: 12px;
    }
    .panel {
        flex: 1;
        min-width: 200px;
    }
    #content {
        padding: 12px;
    }
    #transport {
        flex-wrap: wrap;
    }
}