:root {
  --bg: #fafafa; --surface: #ffffff; --text: #1c1c1c; --mute: #6a6f78;
  --border: rgba(0,0,0,0.12); --accent: #2f6fb3; --src: #2f6fb3; --tgt: #e08a16;
  --chip: rgba(0,0,0,0.05); --radius: 8px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161616; --surface: #1f1f1f; --text: #e8e8e8; --mute: #9aa0aa;
    --border: rgba(255,255,255,0.13); --accent: #5aa0e6; --src: #5aa0e6; --tgt: #f0a93a;
    --chip: rgba(255,255,255,0.07);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.5; -webkit-font-smoothing: antialiased;
}
.app { max-width: 1040px; margin: 0 auto; padding: 28px 22px 48px; }
.head { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
h1 { font-size: 24px; font-weight: 600; margin: 0; letter-spacing: 0; }
.sub { color: var(--mute); margin: 4px 0 0; max-width: 620px; font-size: 14px; }
.switch { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--mute); white-space: nowrap; cursor: pointer; }

.toolbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  margin: 18px 0 14px; padding: 10px 0; border-block: 1px solid var(--border);
}
.tool-group { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.select-wrap { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; color: var(--mute); }
select {
  font: inherit; font-size: 13px; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 6px; padding: 5px 26px 5px 9px;
}
.actions button, .mini-action {
  font: inherit; font-size: 12.5px; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 6px; padding: 5px 9px; cursor: pointer;
}
.actions button:hover, .mini-action:hover, select:hover { border-color: var(--accent); }
.actions button:disabled, .mini-action:disabled { cursor: wait; opacity: 0.62; }

.tabs { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 18px; }
.tab {
  font: inherit; font-size: 13px; padding: 6px 13px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  cursor: pointer; transition: all .12s;
}
.tab:hover { border-color: var(--accent); }
.tab.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.tab:focus-visible,
.play:focus-visible,
.actions button:focus-visible,
.mini-action:focus-visible,
select:focus-visible,
.switch input:focus-visible,
#prog:focus-visible,
.ctrl input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.method { margin-bottom: 14px; }
.method h2 { font-size: 16px; font-weight: 600; margin: 0 0 4px; }
.blurb { margin: 0; color: var(--mute); font-size: 14px; max-width: 760px; }
.facts { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.chip { font-size: 12px; padding: 3px 10px; border-radius: 999px; background: var(--chip); color: var(--text); }
.method-info {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px 14px;
  margin-top: 13px; font-size: 12.5px;
}
.info-item { min-width: 0; }
.info-k { display: block; color: var(--mute); font-size: 11px; text-transform: uppercase; letter-spacing: .05em; }
.info-v { color: var(--text); }
.info-v a { color: var(--accent); text-decoration: none; }
.info-v a:hover { text-decoration: underline; }

.metrics {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px;
  margin: 0 0 14px; min-height: 52px;
}
.metric {
  padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface);
}
.metric-k { display: block; color: var(--mute); font-size: 11px; }
.metric-v { display: block; margin-top: 1px; font-family: ui-monospace, monospace; font-size: 13px; color: var(--text); }

.dataset-panel { margin: 0 0 14px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.dataset-panel summary {
  cursor: pointer; padding: 9px 0; color: var(--mute); font-size: 13px; user-select: none;
}
.experiment-top {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 0 0 12px;
}
.data-status { color: var(--mute); font-size: 12px; min-height: 18px; }
.dataset-controls { display: grid; grid-template-columns: repeat(3, minmax(220px, 1fr)); gap: 14px 18px; padding: 0 0 12px; }
.dataset-controls .ctrl {
  display: grid; grid-template-columns: minmax(104px, max-content) minmax(96px, 1fr) minmax(46px, max-content);
  gap: 10px; min-width: 0;
}
.dataset-controls .ctrl input { width: 100%; min-width: 0; }
.dataset-controls .ctrl-val { min-width: 46px; text-align: right; }
.custom-data-panel {
  border-top: 1px solid var(--border); padding-top: 2px;
}
.custom-data-panel summary { padding: 8px 0; }
.csv-hint { margin: 0 0 8px; color: var(--mute); font-size: 12px; }
.csv-hint code { color: var(--text); font-family: ui-monospace, monospace; }
textarea {
  width: 100%; min-height: 100px; resize: vertical; display: block;
  color: var(--text); background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; padding: 9px 10px; font: 12px/1.45 ui-monospace, monospace;
}
.custom-actions { display: flex; gap: 8px; flex-wrap: wrap; padding: 8px 0 12px; }

.stepper { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 4px 0 16px; }
.stepper li {
  display: flex; align-items: center; gap: 7px; font-size: 12.5px; color: var(--mute);
  padding: 5px 11px 5px 8px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--surface); transition: all .15s;
}
.stepper li .num {
  width: 18px; height: 18px; border-radius: 50%; display: grid; place-items: center;
  font-size: 11px; background: var(--chip); color: var(--mute); flex: none;
}
.stepper li.active { color: #fff; background: var(--accent); border-color: var(--accent); }
.stepper li.active .num { background: rgba(255,255,255,0.25); color: #fff; }
.stepper li.done { color: var(--text); }
.stepper li.done .num { background: var(--accent); color: #fff; }

.stage {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 8px; margin-bottom: 14px;
}
#cv { width: 100%; display: block; border-radius: 6px; }
.stage:fullscreen {
  width: 100vw; height: 100vh; padding: 16px; border: 0; border-radius: 0;
  background: var(--bg); display: grid; place-items: center;
}
.stage:fullscreen #cv { max-width: 100%; max-height: 100%; }

.bar { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
.play {
  flex: none; width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer; display: grid; place-items: center;
}
.play:hover { border-color: var(--accent); }
.play svg { fill: currentColor; }
#prog { flex: 1; accent-color: var(--accent); height: 4px; }
.readout { font-variant-numeric: tabular-nums; font-size: 13px; color: var(--mute); min-width: 150px; text-align: right; font-family: ui-monospace, monospace; }

.capline { display: flex; align-items: baseline; gap: 12px; min-height: 24px; }
.step { font-size: 12px; color: var(--mute); min-width: 56px; font-variant-numeric: tabular-nums; }
.caption { font-size: 15px; }

.ctrls { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 12px; }
.ctrl { display: inline-flex; align-items: center; gap: 10px; font-size: 13px; color: var(--mute); }
.ctrl-lab { white-space: nowrap; }
.ctrl input { accent-color: var(--accent); width: 160px; }
.ctrl-val { font-family: ui-monospace, monospace; color: var(--text); min-width: 30px; }

.foot { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; margin-top: 22px; font-size: 13px; color: var(--mute); border-top: 1px solid var(--border); padding-top: 14px; }
.foot .muted { font-size: 12px; }
.sw { display: inline-block; width: 11px; height: 11px; border-radius: 3px; vertical-align: -1px; }
.sw.src { background: var(--src); } .sw.tgt { background: var(--tgt); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 920px) {
  .dataset-controls { grid-template-columns: repeat(2, minmax(220px, 1fr)); }
}

@media (max-width: 700px) {
  .app { padding: 22px 14px 36px; }
  .head { gap: 12px; }
  .sub { font-size: 13.5px; }
  .toolbar { align-items: flex-start; margin: 14px 0 12px; }
  .tool-group { width: 100%; }
  .actions { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 6px; }
  .actions button { padding-inline: 4px; }
  .tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
    margin: 16px 0 14px;
    -webkit-overflow-scrolling: touch;
  }
  .tab { flex: 0 0 auto; }
  .blurb { font-size: 13.5px; }
  .chip { max-width: 100%; }
  .method-info { grid-template-columns: 1fr; gap: 7px; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dataset-controls { grid-template-columns: 1fr; gap: 12px; }
  .dataset-controls .ctrl { grid-template-columns: minmax(104px, max-content) minmax(90px, 1fr) minmax(46px, max-content); }
  .experiment-top { align-items: stretch; }
  .experiment-top .select-wrap { width: 100%; justify-content: space-between; }
  .experiment-top select { flex: 1; min-width: 0; }
  .data-status { flex-basis: 100%; }
  .stage { padding: 6px; margin-bottom: 12px; }
  .bar { gap: 10px; }
  .readout { min-width: 82px; font-size: 12px; }
  .capline { align-items: flex-start; flex-wrap: wrap; gap: 4px 10px; }
  .caption { flex: 1 1 230px; font-size: 14px; }
  .ctrls { gap: 10px; }
  .ctrl {
    width: 100%;
    justify-content: space-between;
    gap: 12px;
  }
  .ctrl input {
    flex: 1 1 auto;
    min-width: 120px;
    width: auto;
  }
  .foot { gap: 10px 14px; }
}