:root {
  --bg: #0d1014;
  --panel: #151a21;
  --panel-2: #1b2129;
  --line: #2a323d;
  --text: #e6e9ee;
  --muted: #8b95a3;
  --accent: #3ddc84;
  --accent-ink: #062b16;
  --warn: #ffb547;
  --bad: #ff5d6c;
  --good: #3ddc84;
  --pcb: #0f3d2a;
  --pcb-edge: #1c5c40;
  --copper: #c9a24a;
  --led-on: #4fc3ff;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.5 var(--sans); }
a { color: var(--accent); }
code, .mono { font-family: var(--mono); font-size: 0.92em; }

header.top {
  display: flex; align-items: center; gap: 16px; padding: 12px 20px;
  border-bottom: 1px solid var(--line); background: #0b0e12; position: sticky; top: 0; z-index: 5;
}
header.top .brand { font-weight: 700; letter-spacing: 0.02em; }
header.top .brand span { color: var(--accent); }
header.top .crumb { color: var(--muted); }
header.top .spacer { flex: 1; }
header.top .team { color: var(--muted); font-size: 13px; }
header.top a.back { font-size: 13px; text-decoration: none; border: 1px solid var(--line); padding: 4px 10px; border-radius: 6px; color: var(--text); }

main.grid {
  display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(320px, 1fr);
  gap: 16px; padding: 16px 20px 40px; max-width: 1500px; margin: 0 auto;
}
@media (max-width: 980px) { main.grid { grid-template-columns: 1fr; padding: 12px 16px 32px; } }

.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
.card + .card { margin-top: 16px; }
.card h2 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 10px; font-weight: 600; }
.card h1 { font-size: 22px; margin: 0 0 4px; }
.tag { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 99px; background: var(--panel-2); border: 1px solid var(--line); color: var(--muted); margin-right: 6px; }
.tag.pts { color: var(--warn); }
.tag.solved { color: var(--accent-ink); background: var(--accent); border-color: var(--accent); }

.bench { padding: 0; overflow: hidden; }
.bench .stage { position: relative; min-height: 420px; background: radial-gradient(ellipse at 50% 30%, #1a222c 0%, #0f1318 70%); }
.bench .viewing { display: flex; gap: 8px; align-items: center; padding: 10px 14px; border-bottom: 1px solid var(--line); font-size: 13px; color: var(--muted); }
.bench .viewing .src { color: var(--text); font-weight: 600; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; }
.seg button { background: transparent; border: 0; color: var(--muted); padding: 4px 10px; font: inherit; font-size: 12px; cursor: pointer; }
.seg button.on { background: var(--panel-2); color: var(--text); }
.seg button:disabled { opacity: 0.4; cursor: default; }

.transport { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-top: 1px solid var(--line); background: var(--panel); }
.transport button.play { width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--line); background: var(--panel-2); color: var(--text); cursor: pointer; font-size: 14px; }
.transport .time { font-family: var(--mono); font-size: 13px; color: var(--muted); min-width: 120px; text-align: right; }
.transport select { background: var(--panel-2); color: var(--text); border: 1px solid var(--line); border-radius: 6px; padding: 3px 6px; font: inherit; font-size: 12px; }
.scrub { flex: 1; position: relative; height: 26px; }
.scrub input { width: 100%; height: 26px; margin: 0; accent-color: var(--accent); }
.scrub .marks { position: absolute; inset: 0 8px; pointer-events: none; }
.scrub .marks i { position: absolute; top: 2px; width: 2px; height: 6px; background: var(--warn); border-radius: 1px; }
.eventline { padding: 6px 14px 10px; font-size: 13px; color: var(--warn); min-height: 30px; background: var(--panel); }

.drop { border: 1.5px dashed var(--line); border-radius: 10px; padding: 18px; text-align: center; color: var(--muted); cursor: pointer; transition: border-color 0.15s, background 0.15s; }
.drop.over, .drop:hover { border-color: var(--accent); background: rgba(61, 220, 132, 0.05); }
.drop strong { color: var(--text); }
.btn { background: var(--accent); color: var(--accent-ink); border: 0; font-weight: 700; padding: 9px 16px; border-radius: 8px; cursor: pointer; font: inherit; font-weight: 700; }
.btn:disabled { opacity: 0.45; cursor: default; }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); font-weight: 500; }
.row { display: flex; gap: 10px; align-items: center; margin-top: 10px; flex-wrap: wrap; }
.status { font-size: 13px; color: var(--muted); }
.status.err { color: var(--bad); }

ol.steps { margin: 6px 0 0; padding-left: 20px; color: var(--muted); font-size: 14px; }
ol.steps li { margin: 3px 0; }
ol.steps code { color: var(--text); }

ul.checks { list-style: none; margin: 0; padding: 0; }
ul.checks li { display: grid; grid-template-columns: 22px 1fr; gap: 6px; padding: 7px 0; border-bottom: 1px solid var(--line); }
ul.checks li:last-child { border-bottom: 0; }
ul.checks .ic { font-weight: 800; }
ul.checks .ok .ic { color: var(--good); }
ul.checks .no .ic { color: var(--bad); }
ul.checks .nm { font-weight: 600; font-size: 14px; }
ul.checks .dt { grid-column: 2; color: var(--muted); font-size: 13px; font-family: var(--mono); word-break: break-word; }
.empty { color: var(--muted); font-size: 14px; }

.flag { border-color: var(--accent); background: linear-gradient(180deg, rgba(61, 220, 132, 0.10), transparent); }
.flag .value { font-family: var(--mono); font-size: 15px; background: #0a0d10; border: 1px solid var(--line); border-radius: 8px; padding: 10px; word-break: break-all; user-select: all; }

pre.console { margin: 0; max-height: 260px; overflow: auto; background: #07090b; border: 1px solid var(--line); border-radius: 8px; padding: 10px; font: 12.5px/1.45 var(--mono); color: #b9f6ca; white-space: pre-wrap; }

/* readouts shared by the renderers */
.bench .stage { display: flex; flex-direction: column; }
.readouts { order: -1; display: grid; grid-template-columns: repeat(auto-fit, minmax(165px, 1fr)); gap: 8px; padding: 12px 14px 0; }
.readout { background: rgba(13, 16, 20, 0.85); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; }
.readout .k { font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.readout .v { font-family: var(--mono); font-size: 15px; }
.readout .v.big { font-size: 22px; }
canvas.plot { display: block; width: 100%; height: 150px; }
.legend { display: flex; gap: 14px; font-size: 12px; color: var(--muted); padding: 0 14px 8px; }
.legend i { display: inline-block; width: 10px; height: 3px; vertical-align: middle; margin-right: 5px; border-radius: 2px; }

table.list { width: 100%; border-collapse: collapse; font-size: 13px; font-family: var(--mono); }
table.list th { text-align: left; color: var(--muted); font-weight: 500; font-family: var(--sans); font-size: 12px; border-bottom: 1px solid var(--line); padding: 4px 6px; }
table.list td { padding: 3px 6px; border-bottom: 1px solid #20262f; }
table.list tr.new td { background: rgba(79, 195, 255, 0.10); }

.bench .viewing { flex-wrap: wrap; }
@media (max-width: 980px) {
  main.grid > aside { order: -1; }
}
@media (max-width: 640px) {
  header.top { gap: 10px; padding: 10px 16px; }
  header.top .crumb, header.top .team, header.top a.back:first-of-type { display: none; }
}