/* Seminar 27. One stylesheet, no external fonts, no framework.
   The look: a printed seminar handout. Serif text, ruled tables, felt-green accent. */

:root {
  --paper: #f4efe3;
  --paper-2: #ebe4d3;
  --ink: #1d1b16;
  --muted: #5a5548;
  --rule: #cbc1a8;
  --felt: #1b5a43;
  --felt-soft: #dfeadf;
  --on-felt: #ffffff;
  --warn: #9a2a1f;
  --warn-soft: #f6e3dc;
  --computed: #1b5a43;
  --published: #23466f;
  --solver: #7a4d00;
  --card: #fffdf6;
  --card-edge: #b9b09a;
  --serif: Charter, "Bitstream Charter", "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #12161a;
    --paper-2: #1a2026;
    --ink: #e8e2d3;
    --muted: #a8a191;
    --rule: #3a424a;
    --felt: #7fd0aa;
    --felt-soft: #18302a;
    --on-felt: #0d1512;
    --warn: #f0917f;
    --warn-soft: #33201c;
    --computed: #7fd0aa;
    --published: #9dc3ee;
    --solver: #e3b866;
    --card: #f3eee0;
    --card-edge: #8d8676;
  }
}
:root[data-theme="dark"] {
  --paper: #12161a;
  --paper-2: #1a2026;
  --ink: #e8e2d3;
  --muted: #a8a191;
  --rule: #3a424a;
  --felt: #7fd0aa;
  --felt-soft: #18302a;
  --on-felt: #0d1512;
  --warn: #f0917f;
  --warn-soft: #33201c;
  --computed: #7fd0aa;
  --published: #9dc3ee;
  --solver: #e3b866;
  --card: #f3eee0;
  --card-edge: #8d8676;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1.0625rem/1.6 var(--serif);
  overflow-wrap: break-word;
}
a { color: var(--felt); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--felt); outline-offset: 2px; }

.wrap { max-width: 46rem; margin: 0 auto; padding: 0 1rem; }

/* ---------- masthead ---------- */
.mast { border-bottom: 3px double var(--ink); }
.mast .wrap { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.25rem 1.25rem; padding-top: 0.9rem; padding-bottom: 0.6rem; }
.brand { font: 700 1.35rem/1 var(--serif); letter-spacing: 0.01em; color: var(--ink); text-decoration: none; white-space: nowrap; }
.brand b { color: var(--felt); font-weight: 700; }
.brand small { display: block; font: 600 0.62rem/1.4 var(--sans); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin-top: 0.3rem; }
.mast nav { display: flex; flex-wrap: wrap; gap: 0.1rem 0.9rem; font: 600 0.78rem/2 var(--sans); letter-spacing: 0.06em; text-transform: uppercase; flex: 1 1 16rem; }
.mast nav a { color: var(--ink); text-decoration: none; border-bottom: 2px solid transparent; }
.mast nav a:hover, .mast nav a[aria-current="page"] { border-bottom-color: var(--felt); }
.theme {
  font: 600 0.7rem/1 var(--sans); letter-spacing: 0.08em; text-transform: uppercase;
  background: none; color: var(--ink); border: 1px solid var(--ink); border-radius: 2px; padding: 0.4rem 0.55rem; cursor: pointer;
}
.theme:hover { background: var(--ink); color: var(--paper); }

/* ---------- headings ---------- */
main { padding: 1.6rem 0 3rem; }
.kicker { font: 700 0.72rem/1.4 var(--sans); letter-spacing: 0.16em; text-transform: uppercase; color: var(--felt); margin: 0 0 0.4rem; }
h1 { font: 700 2.3rem/1.1 var(--serif); margin: 0 0 0.6rem; letter-spacing: -0.01em; }
.lede { font-size: 1.2rem; line-height: 1.5; color: var(--ink); margin: 0 0 1.4rem; }
h2 { font: 700 1.45rem/1.2 var(--serif); margin: 2.6rem 0 0.7rem; padding-top: 0.7rem; border-top: 1px solid var(--ink); }
h2 .n { font: 700 0.72rem/1 var(--sans); letter-spacing: 0.12em; color: var(--muted); display: block; margin-bottom: 0.4rem; text-transform: uppercase; }
h3 { font: 700 1.08rem/1.3 var(--serif); margin: 1.6rem 0 0.4rem; }
p, ul, ol, dl { margin: 0 0 1rem; }
ul, ol { padding-left: 1.3rem; }
li { margin-bottom: 0.35rem; }
small, .small { font-size: 0.86rem; }
.muted { color: var(--muted); }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }
sup.cite { font: 600 0.66rem/1 var(--sans); letter-spacing: 0.02em; }
sup.cite a { text-decoration: none; padding: 0 0.1em; }
sup.cite a:hover { text-decoration: underline; }

/* ---------- facts strip at the top of a game page ---------- */
.facts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0; overflow: hidden; border: 1px solid var(--ink); margin: 0 0 1.5rem; }
.facts div { padding: 0.55rem 0.7rem; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); margin: 0 -1px -1px 0; }
.facts dt { font: 700 0.64rem/1.3 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.facts dd { margin: 0.15rem 0 0; font-size: 0.98rem; line-height: 1.3; }

/* ---------- playing cards (always light, four-colour deck) ---------- */
.hand { display: inline-flex; flex-wrap: wrap; gap: 3px; vertical-align: middle; margin: 2px 0; }
.k {
  display: inline-block; min-width: 1.75em; padding: 0.12em 0.22em; text-align: center;
  font: 700 0.95rem/1.35 var(--sans); background: var(--card); color: #1d1b16;
  border: 1px solid var(--card-edge); border-radius: 4px; white-space: nowrap;
}
.k.h { color: #b3261e; }
.k.d { color: #1c4fa3; }
.k.c { color: #17683a; }
.k.x { background: transparent; color: var(--muted); border-style: dashed; }
.vs { font: 700 0.7rem/1 var(--sans); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin: 0 0.4rem; }

/* ---------- tables ---------- */
.tw { overflow-x: auto; margin: 0 0 1.2rem; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; line-height: 1.35; }
caption { caption-side: top; text-align: left; font: 700 0.72rem/1.4 var(--sans); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); padding: 0 0 0.4rem; }
th, td { text-align: left; padding: 0.42rem 0.6rem 0.42rem 0; vertical-align: top; border-bottom: 1px solid var(--rule); }
thead th { font: 700 0.7rem/1.3 var(--sans); letter-spacing: 0.08em; text-transform: uppercase; border-bottom: 2px solid var(--ink); vertical-align: bottom; }
tbody tr:last-child > * { border-bottom: 2px solid var(--ink); }
td.num, th.num { text-align: right; font-family: var(--mono); font-size: 0.88rem; font-variant-numeric: tabular-nums; white-space: nowrap; padding-right: 0.9rem; }
tbody th { font-weight: 700; }

/* ---------- the three kinds of claim ---------- */
.ev { border-left: 4px solid var(--rule); padding: 0.15rem 0 0.15rem 0.9rem; margin: 0 0 1.2rem; }
.ev > :last-child { margin-bottom: 0; }
.ev.c { border-left-color: var(--computed); }
.ev.p { border-left-color: var(--published); border-left-style: double; border-left-width: 6px; }
.ev.s { border-left-color: var(--solver); border-left-style: dashed; }
.tag {
  display: inline-block; font: 700 0.62rem/1 var(--sans); letter-spacing: 0.12em; text-transform: uppercase;
  padding: 0.28rem 0.42rem; border: 1px solid currentColor; border-radius: 2px; margin: 0 0.4rem 0.35rem 0; vertical-align: middle; line-height: 1.35;
}
.tag.c { color: var(--computed); }
.tag.p { color: var(--published); }
.tag.s { color: var(--solver); border-style: dashed; }
.ev > .tag { display: table; margin-bottom: 0.45rem; }

.dispute { background: var(--warn-soft); border: 1px solid var(--warn); padding: 0.7rem 0.9rem; margin: 0 0 1.2rem; }
.dispute > :last-child { margin-bottom: 0; }
.dispute h3, .dispute .lab { font: 700 0.7rem/1.3 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; color: var(--warn); margin: 0 0 0.35rem; }
.note { background: var(--paper-2); border: 1px solid var(--rule); padding: 0.7rem 0.9rem; margin: 0 0 1.2rem; }
.note > :last-child { margin-bottom: 0; }
.pending { border: 2px dashed var(--solver); padding: 0.9rem 1rem; margin: 0 0 1.2rem; }
.pending .lab { font: 700 0.7rem/1.3 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; color: var(--solver); margin: 0 0 0.35rem; }
.pending > :last-child { margin-bottom: 0; }

/* ---------- worked examples ---------- */
.ex { list-style: none; padding: 0; margin: 0 0 1.2rem; border-top: 1px solid var(--rule); }
.ex li { padding: 0.55rem 0; margin: 0; border-bottom: 1px solid var(--rule); }
.ex .why { display: block; font-size: 0.93rem; color: var(--muted); margin-top: 0.15rem; }
.win { font: 700 0.66rem/1 var(--sans); letter-spacing: 0.1em; text-transform: uppercase; color: var(--felt); margin-left: 0.3rem; }

/* ---------- syllabus (home) ---------- */
.syl { list-style: none; padding: 0; margin: 0 0 1.5rem; border-top: 2px solid var(--ink); }
.syl li { display: grid; grid-template-columns: 2.4rem 1fr; gap: 0 0.6rem; padding: 0.6rem 0; margin: 0; border-bottom: 1px solid var(--rule); }
.syl .no { font: 700 0.8rem/1.9 var(--mono); color: var(--muted); }
.syl a { font-weight: 700; font-size: 1.08rem; }
.syl span.d { display: block; font-size: 0.93rem; color: var(--muted); }
.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); gap: 0 1.5rem; }

/* ---------- cheat sheet ---------- */
.sheet { border: 2px solid var(--ink); padding: 1rem 1.1rem 0.6rem; margin: 2.6rem 0 1.5rem; background: var(--paper); }
.sheet h2 { border: 0; padding: 0; margin: 0 0 0.2rem; font-size: 1.3rem; }
.sheet .sub { font: 700 0.66rem/1.4 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin: 0 0 0.8rem; }
.sheet h3 { font: 700 0.7rem/1.3 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; color: var(--felt); margin: 0.9rem 0 0.3rem; border-top: 1px solid var(--rule); padding-top: 0.5rem; }
.sheet ul { margin-bottom: 0.5rem; }
.sheet li { margin-bottom: 0.15rem; }
.sheet { overflow-x: auto; }
.sheet table { font-size: 0.9rem; }
@media (max-width: 30rem) {
  .sheet { padding: 0.8rem 0.7rem 0.5rem; }
  .sheet table { font-size: 0.8rem; }
  .sheet td.num, .sheet th.num { font-size: 0.74rem; padding-right: 0.35rem; }
  .sheet th, .sheet td { padding-right: 0.35rem; }
}
.sheet .foot { font-size: 0.78rem; color: var(--muted); border-top: 1px solid var(--rule); padding-top: 0.4rem; margin-top: 0.8rem; }
.btn {
  font: 700 0.74rem/1 var(--sans); letter-spacing: 0.08em; text-transform: uppercase; cursor: pointer;
  background: var(--felt); color: var(--on-felt); border: 1px solid var(--felt); border-radius: 2px; padding: 0.6rem 0.8rem;
}
.btn:hover { filter: brightness(1.12); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--paper); filter: none; }
.btn[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ---------- trainer and calculator ---------- */
.panel { border: 1px solid var(--ink); padding: 1rem; margin: 0 0 1.4rem; background: var(--paper-2); }
.modes, .answers { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0 0 1rem; }
.duel { display: grid; grid-template-columns: 1fr; gap: 0.7rem; margin: 0 0 1rem; }
.duel .side { border: 1px solid var(--rule); background: var(--paper); padding: 0.6rem 0.7rem; }
.duel .side .lab { font: 700 0.66rem/1.3 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin: 0 0 0.3rem; }
.duel .k { font-size: 1.25rem; min-width: 2em; padding: 0.3em 0.25em; }
.duel .read { font-size: 0.9rem; color: var(--muted); margin: 0.35rem 0 0; min-height: 1.3em; }
.q { font-weight: 700; margin: 0 0 0.4rem; }
.verdict { font-weight: 700; margin: 0 0 0.6rem; min-height: 1.6em; }
.verdict.good { color: var(--felt); }
.verdict.bad { color: var(--warn); }
.score { font: 600 0.8rem/1.4 var(--mono); color: var(--muted); }
label { font: 700 0.7rem/1.4 var(--sans); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); display: block; margin: 0 0 0.2rem; }
input[type="text"], input[type="number"], select {
  font: 1rem/1.3 var(--mono); width: 100%; max-width: 100%; padding: 0.45rem 0.5rem; background: var(--paper); color: var(--ink);
  border: 1px solid var(--ink); border-radius: 2px;
}
.fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); gap: 0.7rem 0.9rem; margin: 0 0 1rem; }
.out { font: 1rem/1.5 var(--serif); }
.out .big { font: 700 1.5rem/1.2 var(--mono); }
.err { color: var(--warn); font-weight: 700; }

/* ---------- glossary and sources ---------- */
dl.gloss dt { font-weight: 700; margin-top: 0.9rem; }
dl.gloss dd { margin: 0.1rem 0 0; }
ol.src { padding-left: 0; list-style: none; }
ol.src li { padding: 0.6rem 0; border-bottom: 1px solid var(--rule); margin: 0; }
ol.src .id { font: 700 0.7rem/1 var(--mono); color: var(--felt); margin-right: 0.4rem; }
ol.src .u { display: block; font: 0.78rem/1.4 var(--mono); word-break: break-all; }
ol.src .use { display: block; font-size: 0.9rem; color: var(--muted); }
:target { scroll-margin-top: 1rem; }
ol.src li:target { background: var(--felt-soft); outline: 2px solid var(--felt); outline-offset: 4px; }

/* ---------- footer ---------- */
footer { border-top: 3px double var(--ink); padding: 1.2rem 0 2.5rem; font-size: 0.86rem; color: var(--muted); }
footer p { margin: 0 0 0.5rem; }
footer a { color: var(--muted); }

@media (min-width: 40rem) {
  h1 { font-size: 2.9rem; }
  .facts { grid-template-columns: repeat(3, 1fr); }
  .duel { grid-template-columns: 1fr 1fr; }
  .syl li { grid-template-columns: 3rem 1fr; }
}

/* ---------- print ---------- */
@media print {
  :root, :root[data-theme="dark"], :root:not([data-theme="light"]) {
    --paper: #fff; --paper-2: #fff; --ink: #000; --muted: #333; --rule: #999; --felt: #0b3d2c; --felt-soft: #fff; --on-felt: #fff;
    --warn: #7a1a10; --warn-soft: #fff; --computed: #0b3d2c; --published: #14304f; --solver: #5a3800; --card: #fff; --card-edge: #555;
  }
  body { font-size: 10.5pt; line-height: 1.4; background: #fff; }
  .mast nav, .theme, .noprint, footer .links { display: none !important; }
  .mast { border-bottom-width: 1px; border-bottom-style: solid; }
  .wrap { max-width: none; padding: 0; }
  main { padding: 0.5rem 0 0; }
  a { color: inherit; text-decoration: none; }
  h2 { break-after: avoid; margin-top: 1.4rem; }
  tr, .ev, .dispute, .ex li { break-inside: avoid; }
  .sheet { break-before: page; break-inside: avoid; margin: 0; border-width: 1.5pt; }
  .sheet table { font-size: 9pt; }
  .tw { overflow: visible; }
  body.sheet-only .mast, body.sheet-only footer, body.sheet-only main > :not(.sheet) { display: none !important; }
  body.sheet-only .sheet { break-before: auto; }
  @page { margin: 14mm; }
}

/* ---------- phone-width tables: tighter, so fewer of them need to scroll ---------- */
@media (max-width: 30rem) {
  table { font-size: 0.86rem; }
  th, td { padding-right: 0.4rem; }
  td.num, th.num { font-size: 0.78rem; padding-right: 0.4rem; }
  thead th { font-size: 0.62rem; letter-spacing: 0.03em; }
  h1 { font-size: 2rem; }
}
thead th.num { font-family: var(--sans); font-size: 0.7rem; }
@media (max-width: 30rem) { thead th.num { font-size: 0.62rem; } }