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

:root {
    --bg: #121212;
    --surface: #1e1e1e;
    --surface-hover: #2a2a2a;
    --border: #333;
    --text: #e0e0e0;
    --text-muted: #888;
    --primary: #34495e;
    --primary-hover: #4a6a8a;
    --accent: #4fc3f7;
    --danger: #e74c3c;
    --success: #2ecc71;
    --warning: #f39c12;
    --radius: 8px;
}

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

header {
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

header .subtitle {
    color: var(--text-muted);
    font-weight: 400;
    margin-left: 0.5rem;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Upload Zone */
.drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--accent);
    background: rgba(79, 195, 247, 0.05);
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.drop-zone p {
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.browse-link {
    color: var(--accent);
    cursor: pointer;
    text-decoration: underline;
}

.drop-hint {
    font-size: 0.85rem;
}

.file-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.file-info #file-name {
    font-size: 0.9rem;
    color: var(--text);
}

.btn-icon {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.25rem;
    line-height: 1;
}

.btn-icon:hover {
    color: var(--danger);
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 0.85rem;
    background: var(--primary);
    color: var(--text);
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

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

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

.btn-secondary {
    width: 100%;
    padding: 0.75rem;
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    border-radius: var(--radius);
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: rgba(79, 195, 247, 0.1);
}

/* Progress */
.progress-bar-container {
    width: 100%;
    height: 6px;
    background: var(--surface);
    border-radius: 3px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    border-radius: 3px;
    transition: width 0.3s;
}

.progress-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: 0.5rem;
}

/* Player */
#player-section {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 1rem;
    border: 1px solid var(--border);
}

.spectrogram-img {
    width: 100%;
    border-radius: var(--radius);
}

.waveform {
    width: 100%;
    height: 64px;
}

.player-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.player-controls .btn-icon {
    flex-shrink: 0;
}

.player-controls .btn-icon svg {
    width: 24px;
    height: 24px;
}

.time-display {
    font-size: 0.85rem;
    color: var(--text-muted);
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

/* Results */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.result-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
    transition: border-color 0.3s;
}

.result-card h3 {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.confidence-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 0.25rem;
    font-variant-numeric: tabular-nums;
}

.detected-status {
    font-size: 0.8rem;
    font-weight: 500;
}

.result-card.detected {
    border-color: var(--danger);
}

.result-card.detected .detected-status {
    color: var(--danger);
}

.result-card:not(.detected) .detected-status {
    color: var(--text-muted);
}

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

/* Header: status banner + view tabs */
.header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.view-tabs {
    display: flex;
    gap: 0.5rem;
}

.tab {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.4rem 1rem;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.tab:hover {
    color: var(--text);
}

.tab.active {
    background: var(--primary);
    color: var(--text);
    border-color: var(--primary-hover);
}

.status-banner {
    margin-top: 0.75rem;
    padding: 0.5rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.status-banner.success {
    color: var(--success);
    border-color: var(--success);
}

.status-banner.error {
    color: var(--danger);
    border-color: var(--danger);
}

.status-banner.recording {
    color: var(--warning);
    border-color: var(--warning);
}

/* Views */
.view {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    align-items: start;
}

.main-left {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
}

.panel h2 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Recording */
.record-timer {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    color: var(--text);
    font-variant-numeric: tabular-nums;
    margin-bottom: 0.75rem;
}

.btn-record {
    width: 100%;
    padding: 0.85rem;
    background: var(--success);
    color: #ffffff;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-record:hover {
    filter: brightness(1.1);
}

.btn-record.recording {
    background: var(--danger);
}

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

/* Graph toggle */
.graph-toggle {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.toggle {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.toggle:hover {
    color: var(--text);
}

.toggle.active {
    background: var(--primary);
    color: var(--text);
    border-color: var(--primary-hover);
}

/* Spectrogram + playhead overlay */
.spectrogram-wrap {
    position: relative;
    margin-bottom: 0.75rem;
}

.spectrogram-img {
    width: 100%;
    border-radius: var(--radius);
    display: block;
}

.playhead {
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    background: var(--danger);
    pointer-events: none;
}

/* Player controls */
.player-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.player-controls .btn-icon {
    flex-shrink: 0;
}

.player-controls .btn-icon svg {
    width: 24px;
    height: 24px;
}

.btn-seek {
    flex-shrink: 0;
    width: auto;
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    white-space: nowrap;
}

.btn-small {
    width: auto;
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    display: inline-block;
    text-align: center;
}

.seek-slider {
    flex: 1;
    min-width: 60px;
    accent-color: var(--accent);
    cursor: pointer;
}

.time-display {
    font-size: 0.85rem;
    color: var(--text-muted);
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

/* Result chunk counts */
.chunk-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
}

.result-card.detected .chunk-count {
    color: var(--danger);
}

/* Report actions */
.report-actions {
    display: flex;
    gap: 0.75rem;
}

/* PDF passage viewer */
.pdf-toolbar h2 {
    margin-bottom: 0.5rem;
}

.pdf-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.pdf-zoom-label,
.pdf-page-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
    min-width: 3rem;
    text-align: center;
}

.pdf-container {
    max-height: 480px;
    overflow-y: auto;
    background: #0d0d0d;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.5rem;
    display: flex;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.pdf-container canvas {
    max-width: 100%;
    height: auto;
    background: #ffffff;
}

.pdf-upload {
    margin-top: 0.75rem;
    text-align: center;
}

/* Responsive */
@media (max-width: 600px) {
    main {
        padding: 1rem;
    }

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

    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .drop-zone {
        padding: 2rem 1rem;
    }

    .header-row {
        flex-direction: column;
        align-items: flex-start;
    }
}