:root {
  --paper: #f7f5ef;
  --ink: #192632;
  --muted: #62727e;
  --line: #d6d8d2;
  --blue: #63b8ed;
  --card: #11212d;
  --card-ink: #eaf3f5;
  --card-muted: #a9c1c8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: ui-rounded, "Avenir Next", system-ui, sans-serif;
  line-height: 1.5;
}

a { color: #78c7f4; }
button, a { font: inherit; }

.shell { max-width: 1320px; margin: 0 auto; padding: 28px 32px 22px; }

.masthead { display: flex; align-items: flex-start; justify-content: space-between; gap: 38px; margin-bottom: 20px; }
.masthead h1 { margin: 0; font-size: clamp(2rem, 4vw, 3.7rem); line-height: 1; letter-spacing: -.055em; }
.masthead-meta { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; max-width: 570px; }
.masthead-meta p { margin: 0; color: var(--muted); font-size: .88rem; text-align: right; }
.repo-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 13px;
  font-size: 0.78rem;
  font-weight: 700;
  color: #176ca9;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.15s ease;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}
.repo-link:hover {
  background: #f0f7fb;
  border-color: #176ca9;
  color: #0e4c77;
  text-decoration: none;
}
.github-icon { flex-shrink: 0; }
.eyebrow { margin: 0 0 8px; color: #176ca9; font-size: .72rem; font-weight: 800; letter-spacing: .14em; }

.stage-switch { display: grid; grid-template-columns: repeat(6, 1fr); height: 42px; margin-bottom: 10px; border-bottom: 1px solid var(--line); }
.stage-switch button { border: 0; border-bottom: 3px solid transparent; color: var(--muted); background: transparent; cursor: pointer; text-align: left; font-size: .82rem; font-weight: 750; }
.stage-switch button[aria-current="page"] { border-bottom-color: #176ca9; color: var(--ink); background: #eef0eb; }
.stage-switch b { margin-right: 7px; color: #176ca9; font-size: .7rem; }

.map-card { padding: 16px 16px 11px; color: var(--card-ink); background: var(--card); box-shadow: 0 15px 32px rgba(21, 40, 51, .17); }
.map-toolbar { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 16px; height: 34px; margin-bottom: 10px; overflow: hidden; color: var(--card-muted); font-size: .79rem; }
.map-toolbar strong { color: var(--card-ink); font-size: .86rem; white-space: nowrap; }
.map-actions { display: grid; grid-template-columns: minmax(0, 1fr) 88px; align-items: center; gap: 10px; min-width: 0; }
.map-actions button { padding: 4px 9px; border: 1px solid #496675; border-radius: 2px; color: var(--card-ink); background: transparent; cursor: pointer; font-size: .74rem; white-space: nowrap; }
.map-actions button:hover { border-color: var(--blue); color: var(--blue); }
.map-actions button:disabled { visibility: hidden; }
#cell-readout { min-width: 0; overflow: hidden; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; text-align: right; text-overflow: ellipsis; white-space: nowrap; }

canvas { display: block; width: 100%; aspect-ratio: 1.445 / 1; background: #102630; cursor: crosshair; }

.legend { display: flex; flex-wrap: wrap; gap: 15px; margin: 11px 0 7px; color: var(--card-muted); font-size: .73rem; }
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.legend-chip { width: 11px; height: 11px; display: inline-block; border-radius: 1px; }
.legend-gray { background: #bec9cb; }
.legend-disturbed { background: #e7d3ae; }
.legend-blue { background: var(--blue); }
.legend-black { background: #05090b; border: 1px solid #f2f6f5; }
.legend-origin { background: transparent; border: 2px solid #ff5b61; }
.legend-entry { background: transparent; border: 2px solid #58d5df; }
.legend-ant { background: #f2ba52; border-radius: 50%; }
.legend-highway { background: #70efa7; box-shadow: 0 0 0 1px rgba(112, 239, 167, .35); }
.scatter-straight { background: #63b8ed; }
.scatter-right { background: #f2b84b; }
.scatter-reverse { background: #ef746f; }
.scatter-left { background: #b798f5; }
.history-hit { background: transparent; border: 2px solid #ffb454; }
.history-direct { background: #e89b55; }
.history-stable { background: #63b8ed; }
.reverse-base { background: #b798f5; }
.reverse-highway { background: #ef746f; }
.overview-1 { background: #31586b; }
.overview-2 { background: #63b8ed; }
.overview-3 { background: #70cfa7; }
.overview-4 { background: #e89b55; }
.overview-5 { background: #b798f5; }

.map-caption { display: flex; align-items: center; justify-content: space-between; gap: 16px; color: var(--card-muted); font-size: .73rem; }
.map-links { display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; }
.map-links a { color: #78c7f4; text-decoration: none; }
.map-links a:hover { text-decoration: underline; color: #a4dcfa; }
.link-divider { color: #496675; }

.stage-guide {
  margin-top: 14px;
  margin-bottom: 22px;
  padding: 26px 28px 30px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 4px;
  box-shadow: 0 4px 20px rgba(17, 33, 45, 0.05);
}

.guide-header {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 20px;
}

.guide-title-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.guide-badge {
  display: inline-block;
  padding: 3px 8px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #ffffff;
  background: #176ca9;
  border-radius: 3px;
}

.guide-heading {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 750;
  color: var(--ink);
  letter-spacing: -0.025em;
}

.guide-lean-sig {
  background: #0e1e28;
  border-radius: 3px;
  padding: 8px 14px;
  overflow-x: auto;
  border-left: 3px solid #78c7f4;
}

.guide-lean-sig code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.81rem;
  color: #79d4fd;
  white-space: pre-wrap;
  word-break: break-all;
}

.guide-body {
  margin-top: 4px;
}

.guide-prose {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #334450;
}

.guide-prose p {
  margin: 0 0 10px;
}

.guide-prose p:last-child {
  margin-bottom: 0;
}

.guide-prose ul {
  margin: 8px 0 12px 20px;
  padding: 0;
}

.guide-prose li {
  margin-bottom: 6px;
}

.guide-prose strong {
  color: var(--ink);
  font-weight: 700;
}

.guide-prose code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82em;
  background: #eef2f5;
  padding: 2px 5px;
  border-radius: 3px;
  color: #176ca9;
}

@media (max-width: 760px) {
  .shell { padding: 20px 14px; }
  .masthead { display: block; }
  .masthead-meta { align-items: flex-start; margin-top: 14px; }
  .masthead-meta p { text-align: left; margin-bottom: 8px; }
  .stage-switch { height: 58px; }
  .stage-switch button { padding: 3px; font-size: .68rem; line-height: 1.2; }
  .stage-switch b { display: block; margin: 0 0 2px; }
  .map-toolbar { grid-template-columns: 1fr; align-content: start; gap: 2px; height: 58px; }
  .map-actions { width: 100%; }
  #cell-readout { text-align: left; }
  .map-caption { align-items: flex-start; flex-direction: column; gap: 5px; }
  .stage-guide { padding: 18px 16px 20px; }
  .guide-title-row { flex-direction: column; align-items: flex-start; gap: 6px; }
  .guide-heading { font-size: 1.18rem; }
}