:root {
  --bg: #0c0f0c;
  --panel: #101610;
  --panel-2: #0d130d;
  --line: #24371f;
  --line-2: #16210f;
  --green: #33ff33;
  --green-dim: #1f9e1f;
  --text: #cfe9c6;
  --muted: #6d8a63;
  --amber: #ffd23f;
  --blue: #3d8bff;
  --teal: #00d894;
  --red: #ff5f56;
  --purple: #b06bff;
  --shadow: 4px 4px 0 #000;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  padding: 26px 20px 40px;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(51, 255, 51, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(51, 255, 51, 0.035) 1px, transparent 1px);
  background-size: 32px 32px, 32px 32px;
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas,
    "PingFang SC", "Microsoft YaHei", monospace;
  font-size: 13px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1180px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }

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

.hdr {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 18px;
  padding: 16px 18px;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  flex-wrap: wrap;
}
.hdr-left { display: flex; align-items: center; gap: 14px; }
.logo { display: flex; align-items: center; }
.logo svg {
  width: 34px; height: 34px; display: block;
  filter: drop-shadow(0 0 10px rgba(51, 255, 51, 0.55));
  image-rendering: pixelated;
}
h1 {
  margin: 0; font-size: 22px; letter-spacing: 3px; color: #eaffdf;
  text-shadow: 2px 2px 0 #000;
}
.cursor { color: var(--green); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.sub { margin: 2px 0 0; color: var(--muted); font-size: 11.5px; letter-spacing: 0.3px; }

.badges { display: flex; gap: 6px; flex-wrap: wrap; }
.badge {
  font-size: 11px; padding: 3px 8px; color: var(--muted);
  border: 1px solid var(--line); background: var(--panel-2);
}
.badge.ok { color: var(--teal); border-color: #135c46; }
.badge.best { color: var(--green); border-color: #1f6b1f; }

/* ---------- panels ---------- */

.panel {
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 14px 16px;
}

.row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.row + .row { margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--line-2); }
.label { color: var(--muted); font-size: 12px; letter-spacing: 0.5px; white-space: nowrap; }
.label b { color: var(--green); font-weight: 600; }

.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  font: inherit; font-size: 12px; cursor: pointer;
  padding: 5px 10px; color: var(--text);
  background: var(--panel-2); border: 2px solid var(--line);
  transition: none;
}
.chip:hover { border-color: var(--green-dim); color: #eaffdf; }
.chip.active {
  background: var(--green); border-color: var(--green); color: #051005; font-weight: 700;
  box-shadow: 3px 3px 0 #000;
}

.btn {
  font: inherit; font-size: 12px; cursor: pointer;
  padding: 6px 12px; color: var(--text);
  background: var(--panel-2); border: 2px solid var(--line); box-shadow: 3px 3px 0 #000;
}
.btn:hover { border-color: var(--green-dim); }
.btn:active { transform: translate(3px, 3px); box-shadow: none; }
.btn.primary { color: #051005; background: var(--green); border-color: var(--green); font-weight: 700; }

.switch { font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 6px; cursor: pointer; }
.switch input { accent-color: var(--green); width: 14px; height: 14px; }
.switch.on { color: var(--amber); }

input[type="range"] {
  -webkit-appearance: none; appearance: none; height: 4px; cursor: pointer;
  background: var(--line); border: none; flex: 1 1 110px; min-width: 90px; max-width: 260px;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 12px; height: 16px; background: var(--green);
  border: 2px solid #051005; box-shadow: 2px 2px 0 #000; cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 10px; height: 14px; border-radius: 0; background: var(--green);
  border: 2px solid #051005;
}

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

.stage { padding: 12px 14px 10px; }
.stage-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; flex-wrap: wrap; }
.phase-badge {
  font-size: 11px; padding: 2px 9px; letter-spacing: 1px; text-transform: uppercase;
  border: 1px solid var(--green-dim); color: var(--green); background: #0a150a;
  white-space: nowrap;
}
.phase-badge[data-phase="merge"] { color: var(--blue); border-color: #1f4680; background: #0a1020; }
.phase-badge[data-phase="extend"] { color: var(--amber); border-color: #6b5410; background: #171204; }
.phase-badge[data-phase="pivot"] { color: var(--red); border-color: #6b201c; background: #170706; }
.phase-badge[data-phase="heap"] { color: var(--purple); border-color: #4a2a6b; background: #100816; }
.phase-badge[data-phase="done"] { color: #051005; background: var(--green); border-color: var(--green); font-weight: 700; }
.desc { color: var(--text); font-size: 12px; flex: 1; min-width: 200px; }
.verify { font-size: 11px; color: var(--teal); white-space: nowrap; }
.verify.bad { color: var(--red); }

canvas { display: block; width: 100%; height: 400px; background: var(--panel-2); border: 1px solid var(--line-2); }

.seek { margin: 10px 0 8px; display: flex; align-items: center; gap: 10px; }
.seek input {
  max-width: none; width: 100%; height: 8px;
  background: #16210f; border: 1px solid var(--line);
}
.seek input::-webkit-slider-thumb { width: 12px; height: 16px; }
.seek-label { font-size: 10.5px; color: var(--muted); white-space: nowrap; min-width: 92px; text-align: right; }

.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 11px; color: var(--muted); }
.legend span { display: flex; align-items: center; gap: 5px; }
.legend i { width: 9px; height: 9px; display: inline-block; }

/* ---------- run stack ---------- */

.panel-head {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: 11px; letter-spacing: 1.5px; color: var(--muted); margin-bottom: 8px;
  text-transform: uppercase;
}
.stackbar {
  position: relative; height: 46px; background: var(--panel-2);
  border: 1px solid var(--line-2);
}
.run-block {
  position: absolute; top: 6px; height: 22px; border: 1px solid rgba(0, 0, 0, 0.6);
  overflow: hidden; display: flex; align-items: center; justify-content: center;
  font-size: 10px; color: #051005; font-weight: 700;
  transition: left 90ms linear, width 90ms linear;
}
.run-block::after {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 2px;
  background: rgba(255, 255, 255, 0.35);
}
.stack-empty { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: 11px; }
.stack-axis { position: absolute; left: 0; right: 0; bottom: 4px; height: 1px; background: var(--line); }

/* ---------- stats + log ---------- */

.split { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 18px; }
.log-wrap { display: flex; flex-direction: column; min-width: 0; }
.log-wrap .panel-head { margin-bottom: 6px; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; align-content: start; }
.stat {
  border: 1px solid var(--line-2); background: var(--panel-2); padding: 7px 9px;
  display: flex; flex-direction: column; gap: 1px;
}
.stat span { font-size: 10.5px; color: var(--muted); letter-spacing: 0.5px; }
.stat b { font-size: 17px; color: var(--green); font-weight: 600; text-shadow: 0 0 10px rgba(51, 255, 51, 0.3); }

.log {
  border: 1px solid var(--line-2); background: var(--panel-2); padding: 8px 10px;
  height: 128px; overflow: hidden; display: flex; flex-direction: column; justify-content: flex-end; gap: 2px;
  font-size: 11.5px;
}
.log-line { color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.log-line b { color: var(--green); font-weight: 600; }
.log-line:last-child { color: var(--text); }
.log-line:last-child b { color: var(--amber); }

/* ---------- notes ---------- */

.notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.note { border: 2px solid var(--line); background: var(--panel); box-shadow: var(--shadow); padding: 12px 14px; }
.note h3 { margin: 0 0 6px; font-size: 12.5px; color: var(--green); letter-spacing: 1px; }
.note p { margin: 0; font-size: 11.5px; color: #a9c7a0; line-height: 1.75; }
.note b { color: var(--amber); font-weight: 600; }
.note code { color: var(--teal); background: #0a140a; padding: 0 3px; }

/* ---------- bench ---------- */

.bench table { width: 100%; border-collapse: collapse; font-size: 11.5px; }
.bench th, .bench td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line-2); }
.bench th { color: var(--muted); font-weight: 400; font-size: 10.5px; letter-spacing: 1px; }
.bench td:nth-child(2) { color: var(--green); }
.bench td:nth-child(3) { color: var(--muted); }
.bench .muted { margin: 8px 0 0; }
.muted { color: var(--muted); }

.foot {
  display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap;
  font-size: 11px; color: var(--muted); padding: 2px 4px 0;
}

@media (max-width: 720px) {
  .split, .notes { grid-template-columns: 1fr; }
  canvas { height: 300px; }
  .hdr { flex-direction: column; }
}