:root {
    --bg: #111111;
    --panel: #1c1c1c;
    --panel-2: #242424;
    --text: #f2f2f2;
    --muted: #b8b8b8;
    --accent: #f59e0b;
    --accent-2: #fffb00;
    --border: #383838;
    --button: #2d2d2d;
    --button-hover: #3a3a3a;
    --shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
}

body {
    min-height: 100vh;
}

.app {
    width: min(1000px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 1rem 0 2rem;
}

.app-header {
    margin-bottom: 1rem;
}

.app-header h1 {
    margin: 0 0 0.2rem;
    font-size: clamp(1.8rem, 4vw, 3rem);
    line-height: 1.1;
}

.tagline {
    margin: 0;
    color: var(--muted);
    font-size: 0.98rem;
}

.panel {
    background: linear-gradient(180deg, var(--panel), var(--panel-2));
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow);
}

.file-row,
.button-row,
.time-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
}

#playPauseBtn {
    width: 5rem;
}

.file-label {
    display: inline-block;
    padding: 0.7rem 1rem;
    border-radius: 999px;
    background: var(--button);
    border: 1px solid var(--border);
    cursor: pointer;
    font-weight: 700;
}

#audioFile {
    display: none;
}

.file-name {
    color: var(--muted);
    word-break: break-word;
}

.waveform-panel {
    padding-bottom: 0.75rem;
}

#waveform {
    width: 100%;
    min-height: 220px;
    border-radius: 14px;
    overflow: hidden;
    background: #121212;
    border: 1px solid #2f2f2f;
}

.time-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: 0.75rem;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.time-row>span {
    flex: 0 0 auto;
}

.time-meter {
    flex: 1 1 auto;
    min-width: 160px;
}

.time-meter .meter-wrap {
    margin-top: 0;
}

.time-meter .meter-label {
    margin-bottom: 0.25rem;
    font-size: 0.8rem;
    text-align: center;
}

.time-meter .meter {
    width: 100%;
    height: 14px;
}

.controls-panel .button-row {
    margin-bottom: 1rem;
}

button {
    appearance: none;
    border: 1px solid var(--border);
    background: var(--button);
    color: var(--text);
    padding: 0.8rem 1rem;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 700;
    transition: background 0.15s ease, transform 0.15s ease;
}

button:hover:not(:disabled) {
    background: var(--button-hover);
    transform: translateY(-1px);
}

button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.control-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.control {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 0.85rem;
}

.control label {
    display: block;
    margin-bottom: 0.7rem;
    font-weight: 700;
}

.control input[type="range"] {
    width: 100%;
}

.value-readout {
    margin-top: 0.55rem;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.hint {
    margin-top: 1rem;
    color: var(--muted);
    font-size: 0.95rem;
}

.spacebarClue {
    color: var(--muted);
    font-size: 0.95rem;
}

.meter-wrap {
    margin-top: 0.8rem;
}

.meter-label {
    margin-bottom: 0.35rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.meter {
    width: 100%;
    height: 14px;
    border-radius: 999px;
    overflow: hidden;
    background: #111;
    border: 1px solid var(--border);
}

.meter-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #39ff14 0%, #ffcc00 70%, #ff3b30 100%);
    transition: width 0.04s linear;
}

/* wavesurfer shadow parts */
#waveform ::part(region) {
    background: rgba(119, 255, 0, 0.392);
    border-left: 2px solid rgba(255, 255, 255, 0.75);
    border-right: 2px solid rgba(255, 255, 255, 0.75);
}

#waveform ::part(cursor) {
    border-left: 2px solid var(--accent-2);
}

@media (max-width: 720px) {
    .control-grid {
        grid-template-columns: 1fr;
    }

    .app {
        width: min(1000px, calc(100% - 1rem));
    }

    #waveform {
        min-height: 180px;
    }
}