/* Shared palette. Okabe-Ito blue/vermillion stay distinct for common color-vision
   differences; each also has its own line style and glyph so color is never the only cue. */
:root {
  --ink: #1d232a;
  --muted: #56606b;
  --paper: #fbfaf7;
  --card: #ffffff;
  --rule: #d9dde2;
  --accent: #23406b;
  --parent: #0072b2;
  --minor: #d55e00;
  --mixed: #6b6f76;
  --warn-bg: #fff6e0;
  --warn-rule: #c98a00;
  --max: 52rem;
}

* { box-sizing: border-box; }
html { font-size: clamp(16px, 0.9rem + 0.35vw, 21px); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
code { font-size: 0.92em; }

.masthead, main, footer { max-width: var(--max); margin: 0 auto; padding: 0 1.1rem; }
.masthead { padding-top: 2rem; }
.kicker { color: var(--muted); font-size: 0.85rem; margin: 0; text-transform: uppercase; letter-spacing: 0.04em; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: 0.4rem 0 0.6rem; }
h2 { font-size: 1.45rem; line-height: 1.25; margin: 2.4rem 0 0.6rem; padding-top: 0.6rem; border-top: 2px solid var(--rule); }
h3 { font-size: 1.15rem; margin: 1.8rem 0 0.4rem; }
h4 { font-size: 1rem; margin: 1.4rem 0 0.3rem; }
.lede { font-size: 1.08rem; margin: 0 0 1rem; }

.disclaimer {
  border: 2px solid var(--warn-rule);
  background: var(--warn-bg);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  margin: 1rem 0;
}
.views { margin: 1rem 0 0.5rem; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 0.55rem 1rem;
  border-radius: 6px;
  font-weight: 600;
}
.btn:hover, .btn:focus-visible { background: #16304f; }

.short-answer { background: var(--card); border: 1px solid var(--rule); border-radius: 10px; padding: 0.4rem 1.2rem 1rem; margin-top: 1.5rem; }
.short-answer h2 { border-top: 0; margin-top: 0.8rem; }
.key-points li { margin: 0.45rem 0; }

.summary { font-size: 1.04rem; }
.depth-0 > .summary { background: #eef2f7; border-left: 4px solid var(--accent); padding: 0.6rem 0.9rem; border-radius: 0 6px 6px 0; }
.points li { margin: 0.3rem 0; }
.hint { color: var(--muted); font-size: 0.92rem; }

.node.depth-1, .node.depth-2 { margin-left: 0; }
.node.depth-2 { border-left: 2px solid var(--rule); padding-left: 0.9rem; }

/* "Which way it cuts" badges */
.cuts-line { margin: 0.2rem 0 0.5rem; font-size: 0.88rem; color: var(--muted); }
.cuts {
  display: inline-flex; align-items: center; gap: 0.4em;
  font-size: 0.82rem; font-weight: 600;
  padding: 0.1em 0.6em 0.1em 0.15em; border-radius: 999px;
  border: 2px solid currentColor; background: #fff;
}
.cuts-glyph {
  display: inline-grid; place-items: center;
  width: 1.45em; height: 1.45em; border-radius: 50%;
  color: #fff; font-weight: 700; font-size: 0.85em; flex: none;
}
.cuts-parent { color: var(--parent); border-style: solid; }
.cuts-minor { color: var(--minor); border-style: dashed; }
.cuts-mixed { color: var(--mixed); border-style: dotted; }
.cuts-parent .cuts-glyph { background: var(--parent); }
.cuts-minor .cuts-glyph { background: var(--minor); }
.cuts-mixed .cuts-glyph { background: var(--mixed); }
.cuts-why { margin-left: 0.4em; }
.legend { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.6rem 0 1rem; }

.flags {
  background: var(--warn-bg); border-left: 4px solid var(--warn-rule);
  padding: 0.5rem 0.9rem; border-radius: 0 6px 6px 0; margin: 0.8rem 0; font-size: 0.94rem;
}
.flags ul { margin: 0.3rem 0 0; padding-left: 1.2rem; }

details.sources { margin: 0.6rem 0 1rem; font-size: 0.92rem; }
details.sources summary { cursor: pointer; font-weight: 600; color: var(--muted); }
details.sources ul { margin: 0.4rem 0; padding-left: 1.2rem; }
.src { margin: 0.2rem 0; }
.src-note { color: var(--muted); }
.src-tag { display: inline-block; font-size: 0.75rem; background: #eceae4; color: #4a4a4a; border-radius: 4px; padding: 0 0.4em; }

.toc { background: var(--card); border: 1px solid var(--rule); border-radius: 10px; padding: 0 1.2rem 0.6rem; margin-top: 2rem; }
.toc h2 { border-top: 0; margin-top: 0.8rem; font-size: 1.15rem; }

/* Flowchart */
.flow { list-style: none; padding: 0; margin: 0; }
.flow-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0.4rem 1.2rem; align-items: start; }
.flow-main-col { display: flex; flex-direction: column; align-items: stretch; }
.flow-step, .flow-branch {
  display: flex; gap: 0.6rem; align-items: flex-start;
  text-decoration: none; color: var(--ink);
  background: var(--card); border: 2px solid currentColor; border-radius: 10px;
  padding: 0.6rem 0.8rem; font-size: 0.93rem; line-height: 1.4;
}
.flow-step > span:last-child, .flow-branch > span:last-child { color: var(--ink); }
.flow-step.cuts-parent { border-style: solid; }
.flow-step.cuts-minor, .flow-branch.cuts-minor { border-style: dashed; }
.flow-step.cuts-mixed, .flow-branch.cuts-mixed { border-style: dotted; }
.flow-step:hover, .flow-branch:hover, .flow-step:focus-visible, .flow-branch:focus-visible { background: #f2f5f9; }
.flow-num {
  flex: none; display: inline-grid; place-items: center; width: 1.7em; height: 1.7em;
  border-radius: 50%; background: var(--accent); color: #fff; font-weight: 700; font-size: 0.9em;
}
.flow-branches { display: flex; flex-direction: column; gap: 0.4rem; }
.flow-branch { font-size: 0.88rem; background: #fcfcfc; }
.flow-branch .cuts-glyph { margin-top: 0.1em; }
.flow-arrow { text-align: center; font-size: 1.4rem; color: var(--muted); line-height: 1.2; padding: 0.15rem 0; }
@media (max-width: 640px) {
  .flow-row { grid-template-columns: 1fr; }
  .flow-branches { margin: 0 0 0.3rem 1.4rem; }
  .flow-branches:empty { display: none; }
}

.src-index { columns: 2 18rem; font-size: 0.9rem; }
.src-index li { break-inside: avoid; margin: 0.15rem 0; }
.flag-index li { margin: 0.35rem 0; }

footer { color: var(--muted); font-size: 0.85rem; border-top: 1px solid var(--rule); margin-top: 3rem; padding-bottom: 2rem; }

@media print {
  .views, .btn { display: none; }
  details.sources { display: block; }
  a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 0.75em; word-break: break-all; }
}