:root {
  --bg: #0d1117;
  --panel: #161b22;
  --panel-2: #1c2230;
  --border: #2b313b;
  --ink: #e6edf3;
  --dim: #9aa4b2;
  --faint: #6b7280;
  --teal: #2dd4bf;
  --amber: #f59e0b;
  --violet: #a78bfa;
  --rose: #fb7185;
  --green: #34d399;
  --blue: #60a5fa;
  --mono: "SF Mono", ui-monospace, "Cascadia Code", Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
}

a { color: var(--teal); }

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

/* ---------------------------------------------------------------- header */

header {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--panel);
  flex-wrap: wrap;
}
header h1 { font-size: 15px; margin: 0; font-weight: 600; letter-spacing: .3px; }
header .tag {
  font-size: 11px;
  color: var(--faint);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
  font-family: var(--mono);
}
header .sub { color: var(--dim); font-size: 12px; }
.toolbar { margin-left: auto; display: flex; gap: 10px; align-items: center; }

.btn {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--ink);
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  font-family: inherit;
}
.btn:hover:not(:disabled) { border-color: var(--teal); }
.btn.primary { background: var(--teal); color: #04211d; border-color: var(--teal); font-weight: 600; }
.btn:disabled { opacity: .4; cursor: not-allowed; }

.modeswitch { display: flex; border: 1px solid var(--border); border-radius: 20px; overflow: hidden; }
.modeswitch button {
  background: transparent;
  border: none;
  color: var(--dim);
  padding: 5px 14px;
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
}
.modeswitch button.on { background: var(--teal); color: #04211d; font-weight: 600; }

/* ------------------------------------------------------------ setup form */

.setup { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 20px; padding: 24px; overflow: auto; }
@media (max-width: 980px) { .setup { grid-template-columns: 1fr; } }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; }
.card-head { padding: 14px 18px; border-bottom: 1px solid var(--border); }
.card-head h2 { margin: 0; font-size: 14px; padding: 0; position: static; text-transform: none; letter-spacing: 0; color: var(--ink); }
.card-body { padding: 18px; }

.drop {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 48px 24px;
  text-align: center;
  color: var(--faint);
  transition: .2s;
}
.drop.hot { border-color: var(--teal); color: var(--teal); background: rgba(45, 212, 191, .06); }
.drop .lead { font-size: 16px; margin-bottom: 8px; color: var(--ink); }
.drop .formats { font-size: 12px; margin-top: 10px; line-height: 1.7; }
.drop .actions { display: flex; gap: 10px; justify-content: center; margin-top: 18px; flex-wrap: wrap; }

.filelist { margin-top: 16px; display: grid; gap: 6px; max-height: 240px; overflow: auto; }
.filerow {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 12px;
}
.filerow .nm { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; flex: 1; }
.filerow .sz { color: var(--faint); font-family: var(--mono); }
.filerow button { background: none; border: none; color: var(--faint); cursor: pointer; font-size: 15px; }
.filerow button:hover { color: var(--rose); }

.field { margin-bottom: 14px; }
.field label { display: block; color: var(--dim); font-size: 12px; margin-bottom: 5px; }
.field input, .field select, .field textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 10px;
  background: #0a0e14;
  color: var(--ink);
  font-family: inherit;
  font-size: 13px;
}
.field textarea { min-height: 64px; resize: vertical; font-family: var(--mono); font-size: 12px; }
.field .hint { color: var(--faint); font-size: 11px; margin-top: 5px; line-height: 1.5; }
.field .hint.warn { color: var(--amber); }
.field .hint.ok { color: var(--green); }

.switch { display: flex; gap: 9px; align-items: center; margin: 4px 0 14px; }
.switch input { width: auto; accent-color: var(--teal); }
.switch label { margin: 0; color: var(--ink); font-size: 13px; cursor: pointer; }

.keywrap { position: relative; }
.keywrap input { padding-right: 66px; }
.keywrap .reveal { position: absolute; right: 4px; top: 4px; padding: 4px 9px; font-size: 11px; }

.vlmbox { border: 1px solid var(--border); border-radius: 10px; padding: 14px; margin-bottom: 14px; background: var(--panel-2); }
.formerror { color: var(--rose); font-size: 12px; margin-top: 10px; white-space: pre-wrap; }

/* -------------------------------------------------------------- job bar */

.jobbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 20px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.jobbar .label { font-size: 11px; font-family: var(--mono); color: var(--dim); white-space: nowrap; }
.docs { display: flex; gap: 6px; flex: 1; min-width: 0; }
.docchip {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  color: var(--dim);
  cursor: pointer;
  white-space: nowrap;
  font-family: inherit;
}
.docchip.on { border-color: var(--teal); color: var(--ink); }
.docchip:hover { border-color: var(--teal); }
.dot { width: 8px; height: 8px; border-radius: 8px; background: var(--green); }
.jobbar .warn { font-size: 11px; color: var(--amber); font-family: var(--mono); white-space: nowrap; }
.jobbar .get {
  font-size: 12px;
  border: 1px solid var(--teal);
  color: var(--teal);
  padding: 5px 12px;
  border-radius: 6px;
  text-decoration: none;
  white-space: nowrap;
}
.jobbar .get:hover { background: var(--teal); color: #04211d; }

/* ---------------------------------------------------------- stage spine */

.spine {
  display: flex;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  overflow-x: auto;
}
.stage {
  flex: 1;
  min-width: 156px;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  margin-right: 8px;
  position: relative;
  transition: .2s;
  background: var(--panel-2);
}
.stage:last-child { margin-right: 0; }
.stage .num { font-family: var(--mono); font-size: 11px; color: var(--faint); }
.stage .name { font-weight: 600; font-size: 13px; margin: 2px 0 6px; text-transform: capitalize; }
.stage .st { font-size: 11px; font-family: var(--mono); color: var(--dim); }
.stage .ms { position: absolute; top: 10px; right: 12px; font-size: 10px; font-family: var(--mono); color: var(--faint); }
.stage.pending { opacity: .5; }
.stage.running { border-color: var(--amber); box-shadow: 0 0 0 1px var(--amber) inset; }
.stage.running .st { color: var(--amber); }
.stage.done { border-color: var(--green); }
.stage.done .st { color: var(--green); }
.stage.error { border-color: var(--rose); }
.stage.error .st { color: var(--rose); }
.stage .detail {
  margin-top: 6px;
  font-size: 10.5px;
  font-family: var(--mono);
  color: var(--dim);
  line-height: 1.5;
  max-height: 74px;
  overflow: auto;
  white-space: pre-wrap;
}
.stage .bar { position: absolute; left: 0; bottom: 0; height: 2px; background: var(--amber); width: 0; transition: width .3s; }
.stage.running .bar { width: 60%; }
.stage.done .bar { width: 100%; background: var(--green); }

.jobstatus { padding: 10px 20px; border-bottom: 1px solid var(--border); background: var(--panel); }
.jobstatus .row { display: flex; align-items: center; gap: 12px; font-size: 12px; }
.jobstatus .track { flex: 1; height: 6px; background: #0a0e14; border: 1px solid var(--border); border-radius: 99px; overflow: hidden; }
.jobstatus .fill { height: 100%; background: linear-gradient(90deg, var(--blue), var(--teal)); transition: width .35s; }
.jobstatus .err { color: var(--rose); margin-top: 8px; font-family: var(--mono); font-size: 12px; white-space: pre-wrap; }

/* ------------------------------------------------------------- workbench */

.main { flex: 1; display: grid; grid-template-columns: 340px 1fr 380px; overflow: hidden; }
.col { overflow: auto; border-right: 1px solid var(--border); }
.col:last-child { border-right: none; }
.col h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .6px;
  color: var(--faint);
  margin: 0;
  padding: 12px 14px 8px;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 2;
}

.chunk { padding: 9px 14px; border-bottom: 1px solid var(--border); cursor: pointer; }
.chunk:hover { background: var(--panel-2); }
.chunk.sel { background: var(--panel-2); box-shadow: inset 3px 0 0 var(--teal); }
.chunk .row { display: flex; align-items: center; gap: 8px; }
.chunk .cid { font-family: var(--mono); font-size: 10px; color: var(--faint); margin-left: auto; }
.chunk .prev { font-size: 12px; color: var(--dim); margin-top: 4px; line-height: 1.45; max-height: 34px; overflow: hidden; }
.chunk .meta { font-size: 10px; font-family: var(--mono); color: var(--faint); margin-top: 4px; }

.pill {
  font-size: 9.5px;
  font-family: var(--mono);
  padding: 1px 6px;
  border-radius: 10px;
  text-transform: uppercase;
  letter-spacing: .4px;
  white-space: nowrap;
}

.filt { padding: 8px 14px; display: flex; gap: 6px; flex-wrap: wrap; }
.filt .f {
  font-size: 10px;
  font-family: var(--mono);
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  color: var(--dim);
}
.filt .f.on { border-color: var(--teal); color: var(--teal); }

.viewer { padding: 0 0 40px; }
.pagewrap { position: relative; margin: 14px auto; box-shadow: 0 2px 16px rgba(0, 0, 0, .5); width: fit-content; }
.pagewrap img { display: block; max-width: 100%; }
.ov { position: absolute; border: 1.5px solid transparent; border-radius: 2px; cursor: pointer; transition: .12s; }
.ov:hover { background: rgba(45, 212, 191, .10); }
.ov.hi { border-color: var(--teal); background: rgba(45, 212, 191, .18); box-shadow: 0 0 0 1px var(--teal); }
.pageno { color: var(--faint); font-family: var(--mono); font-size: 11px; text-align: center; padding: 4px; }
.empty { color: var(--faint); text-align: center; padding: 60px 20px; font-size: 13px; line-height: 1.7; }

.insp { padding: 14px; }
.insp .k { font-size: 10px; text-transform: uppercase; letter-spacing: .5px; color: var(--faint); margin-top: 14px; }
.insp .v { font-family: var(--mono); font-size: 12px; color: var(--ink); word-break: break-word; margin-top: 3px; line-height: 1.5; }
.insp .txt {
  font-size: 13px;
  line-height: 1.6;
  color: var(--dim);
  margin-top: 4px;
  background: var(--panel-2);
  padding: 10px;
  border-radius: 6px;
  max-height: 230px;
  overflow: auto;
  white-space: pre-wrap;
}
.trace { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 5px; }
.trace .e {
  font-family: var(--mono);
  font-size: 10px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 4px;
  cursor: pointer;
}
.trace .e:hover { border-color: var(--teal); }

.dl { padding: 14px; }
.dl .item { display: flex; align-items: center; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--border); }
.dl .item .nm { font-family: var(--mono); font-size: 12px; }
.dl .item .ds { font-size: 11px; color: var(--faint); flex: 1; }
.dl a.get {
  margin-left: auto;
  font-size: 11px;
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 5px;
  text-decoration: none;
  color: var(--teal);
}
.dl a.get:hover { border-color: var(--teal); }

.tabs { display: flex; gap: 4px; padding: 8px 14px 0; }
.tab {
  font-size: 11px;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  color: var(--dim);
}
.tab.on { background: var(--panel-2); color: var(--ink); }
.snippet {
  font-family: var(--mono);
  font-size: 10.5px;
  background: #0a0e14;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px;
  color: var(--dim);
  white-space: pre;
  overflow: auto;
  line-height: 1.5;
  margin: 10px 14px;
}

/* -------------------------------------------------------------- graph */

#sigma { width: 100%; height: 620px; background: #0a0e14; border: 1px solid var(--border); border-radius: 8px; }
.legend { display: flex; flex-wrap: wrap; gap: 8px; padding: 6px 0; align-items: center; }
.legend .lg { font-size: 10px; font-family: var(--mono); cursor: pointer; }
.legend .lg.off { opacity: .35; text-decoration: line-through; }
.legend .swatch { display: inline-block; width: 8px; height: 8px; border-radius: 8px; margin-right: 4px; }
.nodecard { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 12px; margin-top: 8px; }
.gbtn {
  font-size: 11px;
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 5px;
  background: var(--panel-2);
  color: var(--teal);
  cursor: pointer;
  text-decoration: none;
}
.gbtn:hover { border-color: var(--teal); }

.spanmap { padding: 10px 14px; line-height: 2.1; }
.span { display: inline-block; height: 14px; vertical-align: middle; margin-right: 3px; border-radius: 3px; cursor: pointer; transition: .1s; }
.span:hover { filter: brightness(1.35); }
.span.sel { outline: 2px solid var(--teal); outline-offset: 1px; }
.tip {
  position: fixed;
  z-index: 50;
  background: #0a0e14;
  border: 1px solid var(--teal);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 11px;
  font-family: var(--mono);
  color: var(--ink);
  max-width: 320px;
  pointer-events: none;
  box-shadow: 0 4px 20px rgba(0, 0, 0, .6);
}
.caption { font-size: 11px; color: var(--faint); padding: 4px 14px; font-family: var(--mono); }

/* --------------------------------------------------------- explain mode */

.explain { max-width: 1000px; margin: 0 auto; padding: 24px; }
.step {
  display: flex;
  gap: 18px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 16px;
  background: var(--panel-2);
  align-items: flex-start;
}
.step .icon { width: 44px; height: 44px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 22px; flex-shrink: 0; }
.step h3 { margin: 0 0 4px; font-size: 16px; }
.step p { margin: 0; color: var(--dim); font-size: 14px; line-height: 1.6; }
.step .nums { margin-top: 8px; font-family: var(--mono); font-size: 12px; color: var(--teal); }
.banner { text-align: center; padding: 24px 20px 8px; }
.banner h2 { font-size: 22px; margin: 0 0 6px; }
.banner p { color: var(--dim); margin: 0; font-size: 14px; }
.arrow { text-align: center; color: var(--faint); font-size: 18px; margin: -8px 0; }
.quicklinks { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin: 18px 0 8px; }
.quicklinks a {
  text-decoration: none;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  color: var(--ink);
  font-size: 13px;
}
.quicklinks a:hover { border-color: var(--teal); }
.quicklinks a .cap { display: block; font-size: 11px; color: var(--faint); margin-top: 2px; }

/* ----------------------------------------------------------- learn mode */

.scrolly { display: grid; grid-template-columns: minmax(360px, 1fr) 1fr; gap: 40px; max-width: 1300px; margin: 0 auto; padding: 0 30px 40vh; }
@media (max-width: 980px) { .scrolly { grid-template-columns: 1fr; } .scrolly-sticky { display: none; } }
.scrolly-steps { display: flex; flex-direction: column; gap: 52vh; padding: 30vh 0; }
.scrolly-step {
  opacity: .35;
  transition: opacity .4s, transform .4s;
  transform: translateY(8px);
  border-left: 3px solid var(--border);
  padding-left: 20px;
}
.scrolly-step.on { opacity: 1; transform: none; border-left-color: var(--teal); }
.scrolly-step .icon { width: 44px; height: 44px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 10px; }
.scrolly-step h3 { margin: 0 0 6px; font-size: 19px; }
.scrolly-step p { margin: 0; color: var(--dim); font-size: 15px; line-height: 1.65; }
.scrolly-step .nums { margin-top: 10px; font-family: var(--mono); font-size: 12px; color: var(--teal); }
.scrolly-sticky { position: sticky; top: 0; height: 100vh; display: flex; align-items: center; justify-content: center; }
.anim-wrap { width: 100%; max-width: 460px; }
.anim-svg { width: 100%; aspect-ratio: 1; background: #0a0e14; border: 1px solid var(--border); border-radius: 14px; }
.anim-cap { text-align: center; color: var(--dim); font-size: 13px; margin-top: 14px; min-height: 36px; transition: .3s; }

.sandbox { margin-top: 16px; padding: 16px; border: 1px solid var(--border); border-radius: 12px; background: var(--panel-2); }
.sandbox input[type=range] { accent-color: var(--teal); }
.sandbox-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 14px 0; }
.sandbox-grid .sv { font-family: var(--mono); font-size: 20px; color: var(--teal); font-weight: 600; }
.sandbox-grid .sl { font-size: 11px; color: var(--faint); margin-top: 2px; }
.sandbox-bar { display: flex; gap: 2px; align-items: flex-end; height: 32px; margin-top: 6px; }