:root {
  --bg: #0f1115; --card: #171a21; --line: #262b36; --text: #e6e8ee; --muted: #8b93a7;
  --accent: #ffb454; --accent2: #5ad1ff; --beat: rgba(255,180,84,.55); --down: #ffb454;
  --wave-a: #5ad1ff; --wave-b: #7dffa7; --play: #ff5d8f;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 14px/1.45 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; }
header { padding: 28px 24px 8px; max-width: 1200px; margin: 0 auto; }
h1 { margin: 0; font-size: 28px; letter-spacing: -.02em; }
h1 span { color: var(--accent); }
.tagline { color: var(--muted); margin: 4px 0 8px; }
.health { color: var(--muted); font-size: 12px; display: flex; gap: 12px; flex-wrap: wrap; }
.health b { color: var(--text); font-weight: 500; }
.health .bad { color: #ff7a7a; }
main { max-width: 1200px; margin: 0 auto; padding: 8px 24px 60px; display: flex; flex-direction: column; gap: 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
.drop { display: block; border: 2px dashed var(--line); border-radius: 10px; padding: 34px; text-align: center; cursor: pointer; color: var(--muted); transition: border-color .15s, background .15s; }
.drop:hover, .drop.over { border-color: var(--accent); background: rgba(255,180,84,.05); color: var(--text); }
.drop input { display: none; }
.drop strong { color: var(--text); }
.row { display: flex; gap: 16px; align-items: center; margin-top: 10px; }
.small { font-size: 12px; color: var(--muted); }
label { display: inline-flex; gap: 8px; align-items: center; }
select, input[type=number] { background: #0f1115; color: var(--text); border: 1px solid var(--line); border-radius: 6px; padding: 6px 8px; font: inherit; }
input[type=number] { width: 96px; }
button, .button { background: #22283a; color: var(--text); border: 1px solid var(--line); border-radius: 6px; padding: 7px 12px; font: inherit; cursor: pointer; text-decoration: none; }
button:hover, .button:hover { border-color: var(--accent2); }
button:disabled { opacity: .4; cursor: default; }
button.primary, .button { background: var(--accent); color: #1b1300; border-color: transparent; font-weight: 600; }
button.ghost { background: transparent; }
button.big { font-size: 18px; padding: 6px 16px; }
button.toggle.on { background: var(--accent2); color: #001a26; border-color: transparent; font-weight: 600; }
.status { color: var(--muted); display: flex; gap: 12px; align-items: center; }
/* display matters: a bare <span> is inline, and width/height do not apply to inline
   boxes, so without this the spinner is invisible anywhere its parent is not a flex
   container. flex:none stops it being squashed where the parent is one. */
.spinner { display: inline-block; vertical-align: -2px; flex: none; width: 14px; height: 14px; border: 2px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; }
.spinner.on-accent { border-color: rgba(0,0,0,.25); border-top-color: #1b1300; }
@keyframes spin { to { transform: rotate(360deg); } }

/* indeterminate bar across the top of the window whenever a job is in flight - visible
   even when the control that started it has been scrolled off screen */
#busy { position: fixed; top: 0; left: 0; right: 0; height: 3px; overflow: hidden; z-index: 50; pointer-events: none; }
#busy[hidden] { display: none; }
#busy::before { content: ""; display: block; height: 100%; width: 40%; border-radius: 3px; background: linear-gradient(90deg, transparent, var(--accent), transparent); animation: sweep 1.1s ease-in-out infinite; }
@keyframes sweep { from { transform: translateX(-100%); } to { transform: translateX(350%); } }

button.busy { opacity: 1; cursor: progress; }
button.busy:disabled { opacity: .85; }
.hint.working { color: var(--accent); }

@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2.4s; }
  #busy::before { animation: none; width: 100%; opacity: .55; }
}
/* ID3 text comes from the uploaded file, so it is escaped before it reaches innerHTML */
.trackinfo { margin-bottom: 12px; }
.trackinfo .t { font-size: 19px; font-weight: 600; letter-spacing: -.01em; }
.trackinfo .a { color: var(--text); margin-top: 1px; }
.trackinfo .tech { color: var(--muted); font-size: 12px; margin-top: 3px; font-variant-numeric: tabular-nums; }
.trackinfo .untagged { font-style: italic; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; margin-bottom: 12px; }
.stat { background: #0f1115; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; }
.stat .k { color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: .06em; }
.stat .v { font-size: 20px; font-weight: 600; margin-top: 2px; }
.stat .v small { font-size: 12px; color: var(--muted); font-weight: 400; }
.panel-title { font-weight: 600; margin-bottom: 8px; }
.hint { color: var(--muted); font-weight: 400; font-size: 12px; margin-left: 8px; }
canvas.wave { width: 100%; height: 180px; display: block; border-radius: 6px; background: #0b0d11; cursor: crosshair; }
canvas.tempo { width: 100%; height: 120px; display: block; border-radius: 6px; background: #0b0d11; cursor: pointer; }
.overview { height: 26px; margin-top: 6px; border-radius: 4px; background: #0b0d11; position: relative; overflow: hidden; }
.overview canvas { width: 100%; height: 100%; display: block; }
.overview .win { position: absolute; top: 0; bottom: 0; border: 1px solid var(--accent2); background: rgba(90,209,255,.12); pointer-events: none; }
.controls { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.transport { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; position: sticky; bottom: 12px; box-shadow: 0 8px 30px rgba(0,0,0,.5); }
.ab { display: flex; gap: 4px; }
.check { color: var(--muted); }
.time { font-variant-numeric: tabular-nums; font-size: 16px; margin-left: auto; }

.charts { display: grid; grid-template-columns: minmax(0, 3fr) minmax(220px, 1fr); gap: 14px; }
@media (max-width: 800px) { .charts { grid-template-columns: 1fr; } }
.warn[hidden] { display: none; }
.warn { display: flex; gap: 10px; align-items: flex-start; background: rgba(255,180,84,.09); border: 1px solid rgba(255,180,84,.45); border-radius: 8px; padding: 10px 12px; margin-bottom: 12px; }
.warn .icon { font-size: 18px; line-height: 1.2; }
.warn b { color: var(--accent); }
.warn a { color: var(--accent2); cursor: pointer; text-decoration: underline; margin-left: 6px; }
.stat.flag { border-color: rgba(255,180,84,.6); }
.stat.flag .v { color: var(--accent); }