:root {
  color-scheme: light;
  --paper: #f8f7f3;
  --white: #fffefa;
  --ink: #1a2241;
  --muted: #535a72;
  --line: #dedfe6;
  --primary: #293883;
  --accent: #5867d4;
  --graph: #eaeefa;
  --formula: #eef0f9;
  --good: #176046;
  --bad: #92382e;
  --radius: 18px;
  font: 15px/1.5 "DM Sans", system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
body { margin: 0; }
button, select { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: default; opacity: .42; }
button:focus-visible, a:focus-visible, select:focus-visible {
  outline: 3px solid #5867d4;
  outline-offset: 3px;
}
a { color: inherit; }
[hidden] { display: none !important; }
.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  background: var(--white);
  padding: 8px 14px;
  z-index: 3;
}
.skip-link:focus { top: 8px; }

.masthead {
  min-height: 68px;
  padding: 12px max(4vw, calc((100vw - 1240px) / 2));
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  text-decoration: none;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -.45px;
  white-space: nowrap;
}
.brand-icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--primary);
  color: white;
  font: 26px/1 system-ui, sans-serif;
}
.masthead nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 3vw, 34px);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
}
.masthead nav a { text-decoration: none; }
.masthead nav a:hover, .text-button:hover:enabled { text-decoration: underline; }
.text-button {
  border: 0;
  background: transparent;
  color: var(--primary);
  font-weight: 700;
  padding: 8px 2px;
  white-space: nowrap;
}
.text-button span { margin-left: 4px; }

main { max-width: 1312px; padding: 38px 36px 22px; margin: auto; }
.intro { display: flex; gap: 20px; justify-content: space-between; align-items: end; margin-bottom: 26px; }
h1 {
  margin: 0 0 5px;
  font: 400 clamp(45px, 5.9vw, 76px)/.96 "Instrument Serif", Georgia, serif;
  letter-spacing: -.025em;
}
.intro p { color: var(--muted); margin: 9px 0 0; }
.progress {
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 600;
}
.progress::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: #588772; }

.workspace { display: grid; grid-template-columns: minmax(0, 1fr) 304px; align-items: start; gap: 18px; }
.board-card, .relation-card, .edges-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.board-card { overflow: hidden; }
.board-header, .board-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
}
h2 { margin: 0; font-size: 17px; font-weight: 700; letter-spacing: -.025em; }
.board-header h2 { font-size: 20px; }
.level-picker, .edit-controls { display: flex; align-items: center; gap: 7px; }
.level-select-wrap, .icon-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  height: 36px;
}
.level-select-wrap {
  position: relative;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 9px;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}
.level-select-wrap::after {
  content: "";
  width: 5px;
  height: 5px;
  border-right: 1.5px solid;
  border-bottom: 1.5px solid;
  transform: translateY(-2px) rotate(45deg);
}
.level-select-wrap:focus-within { outline: 3px solid var(--accent); outline-offset: 3px; }
.level-select-wrap select { position: absolute; inset: 0; width: 100%; opacity: 0; cursor: pointer; }
.board-rule { display: none; }
.icon-button { width: 36px; padding: 0; font-size: 18px; }
.icon-button:hover:enabled, .secondary:hover:enabled { background: var(--formula); }
.board-footer { min-height: 59px; font-size: 13px; }
.board-footer p { margin: 0; color: var(--muted); }
.edit-controls { gap: 16px; }

.board {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  height: clamp(445px, 53vh, 530px);
  background: radial-gradient(circle, #bfc7e0 1px, transparent 1.25px) center / 20px 20px, var(--graph);
  border-block: 1px solid #dce0ee;
}
.edge-layer, .world-layer { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.edge-layer { overflow: visible; }
.edge { fill: none; stroke: #414eab; stroke-width: 2.4; stroke-linecap: round; }
.edge.dim { opacity: .35; }
.edge.emphasized { stroke-width: 3.4; }
.edge.preview { stroke: #626db6; stroke-dasharray: 4 5; }
.world {
  position: absolute;
  transform: translate(-50%, -50%);
  width: clamp(132px, 13vw, 161px);
  min-height: 91px;
  padding: 9px 7px;
  background: #fff;
  border: 1px solid #aeb8d6;
  border-radius: 12px;
  box-shadow: 0 3px 0 #5364a426, 0 8px 16px #26337410;
  pointer-events: auto;
  touch-action: none;
  user-select: none;
  cursor: crosshair;
  text-align: center;
}
.world:hover, .world.selected, .world.destination {
  border-color: var(--accent);
  background: #f8f8ff;
}
.world.selected { box-shadow: 0 0 0 3px #6876da55, 0 5px 12px #26337420; }
.world.destination { box-shadow: 0 0 0 3px #6876da36; }
.world-name { display: block; font: 21px/1.02 Georgia, serif; color: var(--primary); }
.world-name sub { font-size: .62em; }
.valuation {
  display: block;
  margin-top: 4px;
  font: 16px/1.15 Georgia, "Times New Roman", serif;
  color: #4a536e;
}
.formulas {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 3px;
  margin-top: 7px;
}
.formula {
  display: inline-block;
  padding: 2px 4px;
  border-radius: 4px;
  background: var(--formula);
  color: var(--ink);
  font: 17px/1.16 Georgia, "Times New Roman", serif;
  white-space: nowrap;
}
.formula.passed { background: #e2f4eb; color: var(--good); }
.formula.failed { background: #ffe6df; color: var(--bad); box-shadow: inset 0 -2px #c76455; }

.sidebar { display: grid; gap: 14px; min-width: 0; }
.relation-card, .edges-card { padding: 18px; }
.rule-heading { display: flex; gap: 9px; align-items: center; }
.rule-icon {
  display: grid;
  place-items: center;
  flex: 0 0 32px;
  height: 32px;
  border-radius: 8px;
  background: #e9ebfa;
  color: var(--primary);
  font: 20px/1 system-ui, sans-serif;
}
.relation-card > p, .empty-edges { margin: 8px 0 15px; color: var(--muted); font-size: 14px; }
.arrow-stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin: 16px 0; }
.arrow-stats div { display: grid; justify-items: center; padding: 9px 4px; border-radius: 9px; background: #f1f1f7; }
.arrow-stats strong { font-size: 23px; line-height: 1.2; font-weight: 700; font-variant-numeric: tabular-nums; }
.arrow-stats span { margin-top: 4px; font-size: 12px; color: var(--muted); }
.action-buttons { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.primary, .secondary {
  display: inline-flex;
  gap: 9px;
  justify-content: center;
  align-items: center;
  min-height: 42px;
  padding: 8px 12px;
  border: 1px solid var(--primary);
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
}
.primary:hover:enabled { background: #37499f; }
.secondary { background: var(--white); color: var(--primary); border-color: var(--line); }
.relation-card .feedback { margin: 12px 0 0; padding: 10px 11px; border-radius: 8px; background: #edf0fb; color: var(--primary); font-size: 14px; }
.relation-card .feedback.bad { background: #fff0eb; color: var(--bad); }
.relation-card .feedback.good { background: #e7f4ed; color: var(--good); }
.advance { width: 100%; margin-top: 9px; }

.empty-edges { margin-bottom: 0; }
.edge-list { display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 10px 0 0; list-style: none; }
.edge-list:empty { margin: 0; }
.edge-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 7px;
  background: var(--formula);
  border: 1px solid transparent;
  border-radius: 6px;
  font: 14px/1.2 Georgia, serif;
}
.edge-chip span { font: 13px/1 system-ui, sans-serif; color: #505982; }
.edge-chip:hover { border-color: #8d99d8; }
footer { display: flex; justify-content: space-between; gap: 10px; margin-top: 16px; font-size: 12px; color: var(--muted); }

dialog {
  width: min(550px, calc(100% - 28px));
  max-height: calc(100% - 28px);
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
}
dialog::backdrop { background: #161e3b91; }
.dialog-header { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.dialog-header h2 { font: 38px/1 "Instrument Serif", Georgia, serif; }
dialog p, .guide-key { color: var(--muted); }
.guide-key { padding: 10px 14px; border-radius: 10px; background: var(--formula); }
.guide-key div { display: grid; grid-template-columns: 42px 1fr; gap: 8px; padding: 5px 0; }
.guide-key dt { color: var(--ink); font: 21px/1.2 Georgia, serif; }
.guide-key dd { margin: 0; }
.no-script { max-width: 70ch; margin: 0 auto; padding: 14px; }

@media (max-width: 960px) {
  main { padding-inline: 20px; }
  .workspace { grid-template-columns: minmax(0, 1fr) 260px; gap: 12px; }
  .world { width: 126px; }
}
@media (max-width: 790px) {
  .workspace { grid-template-columns: minmax(0, 1fr); }
  .board-rule { display: block; margin: 0; padding: 0 20px 11px; color: var(--muted); font-size: 13px; }
  .sidebar { grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); align-items: start; }
}
@media (max-width: 540px) {
  .masthead { min-height: 58px; padding-inline: 12px; }
  .brand { font-size: 17px; gap: 7px; }
  .brand-icon { width: 30px; height: 30px; font-size: 22px; }
  main { padding: 22px 10px 18px; }
  .intro { display: block; margin: 0 3px 15px; }
  h1 { font-size: clamp(38px, 10.7vw, 53px); }
  .intro p { font-size: 13px; }
  .intro .progress { margin-top: 6px; }
  .board-header, .board-footer { padding: 9px 10px; }
  .board-header h2 { font-size: 16px; }
  .board-rule { padding: 0 10px 8px; font-size: 12px; }
  .board-footer { min-height: 53px; font-size: 12px; }
  .edit-controls { gap: 9px; }
  .level-picker { gap: 4px; }
  .icon-button { width: 31px; }
  .board { height: 398px; }
  .board[data-world-count="5"] { height: 438px; }
  .world { width: 106px; min-height: 77px; padding: 6px 3px; }
  .world-name { font-size: 19px; }
  .valuation { font-size: 15px; margin-top: 3px; }
  .formulas { margin-top: 5px; gap: 2px; }
  .formula { font-size: 16px; padding-inline: 3px; }
  .sidebar { grid-template-columns: 1fr; gap: 10px; }
  .relation-card, .edges-card { padding: 14px; }
  footer { flex-wrap: wrap; }
}
@media (max-width: 350px) {
  .world { width: 98px; }
  .masthead nav { gap: 9px; }
}