/* Gannon Academy — design system.
   Fingerprint: "the drawing office". Jamie's track (data-track="j") is a drawing sheet: framed, zoned,
   with a title block. Oliver's track (data-track="o") is an exercise book: a cover label, a margin rule,
   calm spacing. One set of tokens, two textures. Read style-guide.md before editing.
   Fonts (Google Fonts, linked in each page <head>): Anybody (display), Atkinson Hyperlegible Next (body),
   Atkinson Hyperlegible Mono (labels, numbers, speaker names). */

/* ---------- Tokens ---------- */
:root {
  color-scheme: light dark;
  /* surfaces: cool drawing film, never cream */
  --sheet: #F1F3EF;
  --sheet-2: #E6EAE5;
  --sheet-3: #D7DDD7;
  --card: #FAFBF9;
  /* ink: graphite, never pure black */
  --ink: #1B201E;
  --ink-2: #434B47;
  --ink-3: #5E6762;
  --rule: rgba(27, 32, 30, .16);
  --rule-strong: rgba(27, 32, 30, .62);
  /* structure: machine-tool green, used for bands and the footer only */
  --machine: #2E4A3F;
  --machine-2: #3D5E51;
  --on-machine: #E9EFEB;
  /* track accents: one chromatic note per page */
  --blue: #1D4F91;        /* engineer's blue (marking-out) — Jamie */
  --blue-wash: #DCE5F1;
  --red: #A63D40;         /* exercise-book margin — Oliver */
  --red-wash: #F3E2E1;
  --feint: rgba(29, 79, 145, .14); /* feint ruled lines in Oliver's book */
  /* states (quiz, callouts) — always paired with a word and a glyph */
  --ok: #2B6A47;
  --ok-wash: #DDEBE2;
  --bad: #94400F;
  --bad-wash: #F4E4D8;
  /* defaults to Jamie's accent; [data-track] switches it */
  --accent: var(--blue);
  --accent-wash: var(--blue-wash);

  --display: "Anybody", "Arial Narrow", system-ui, sans-serif;
  --body: "Atkinson Hyperlegible Next", "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Atkinson Hyperlegible Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --col: 41rem;           /* reading measure */
  --margin: 17rem;        /* right margin column on a sheet */
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --r: 2px;               /* drawings have square corners */
  --r-book: 6px;          /* the exercise-book label is the only rounded thing */
  --line: 1.5px;          /* the sheet's thick line */
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --sheet: #151918; --sheet-2: #1D2321; --sheet-3: #27302D; --card: #1A1F1D;
    --ink: #E3E8E4; --ink-2: #B7C0BB; --ink-3: #9AA49F;
    --rule: rgba(227, 232, 228, .14); --rule-strong: rgba(227, 232, 228, .55);
    --machine: #22372F; --machine-2: #2E4A3F; --on-machine: #E3E8E4;
    --blue: #8DB2E8; --blue-wash: #1C2A3D;
    --red: #E59A97; --red-wash: #3A2322;
    --feint: rgba(141, 178, 232, .12);
    --ok: #8FCBA6; --ok-wash: #1C3026;
    --bad: #F0A77A; --bad-wash: #3A271B;
  }
}
:root[data-theme="dark"] {
  --sheet: #151918; --sheet-2: #1D2321; --sheet-3: #27302D; --card: #1A1F1D;
  --ink: #E3E8E4; --ink-2: #B7C0BB; --ink-3: #9AA49F;
  --rule: rgba(227, 232, 228, .14); --rule-strong: rgba(227, 232, 228, .55);
  --machine: #22372F; --machine-2: #2E4A3F; --on-machine: #E3E8E4;
  --blue: #8DB2E8; --blue-wash: #1C2A3D;
  --red: #E59A97; --red-wash: #3A2322;
  --feint: rgba(141, 178, 232, .12);
  --ok: #8FCBA6; --ok-wash: #1C3026;
  --bad: #F0A77A; --bad-wash: #3A271B;
}

[data-track="j"] { --accent: var(--blue); --accent-wash: var(--blue-wash); }
[data-track="o"] { --accent: var(--red); --accent-wash: var(--red-wash); }

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--sheet);
  color: var(--ink);
  font: 400 1.0625rem/1.65 var(--body);
  overflow-x: clip;
}
[data-track="o"] body, body[data-track="o"] { font-size: 1.125rem; line-height: 1.75; }
img, svg, video { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
::selection { background: var(--accent-wash); color: var(--ink); }
p, ul, ol, dl, figure { margin: 1rem 0 0; }
ul, ol { padding-left: 1.3rem; }
li + li { margin-top: .35rem; }
code, kbd, .mono {
  font-family: var(--mono);
  font-size: .92em;
}
code { background: var(--sheet-2); padding: .05em .3em; border-radius: var(--r); overflow-wrap: anywhere; }
pre { overflow-x: auto; max-width: 100%; background: var(--sheet-2); padding: 1rem; border: 1px solid var(--rule); }
.skip { position: absolute; left: -9999px; top: 0; }
.skip:focus { left: 1rem; top: 1rem; z-index: 20; background: var(--card); color: var(--ink); padding: .6rem .9rem; border: var(--line) solid var(--ink); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- Type ---------- */
h1, h2, h3, h4 {
  font-family: var(--display);
  font-stretch: condensed;
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -.005em;
  margin: 0;
  color: var(--ink);
  text-wrap: balance;
}
h1 { font-size: clamp(2.1rem, 5.4vw, 3.5rem); }
h2 { font-size: clamp(1.55rem, 3.2vw, 2.1rem); margin-top: 3rem; }
h3 { font-size: 1.3rem; margin-top: 2rem; }
h4 { font-size: 1.05rem; margin-top: 1.5rem; }
.label {
  font: 600 .7rem/1.2 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.lede { font-size: 1.22rem; line-height: 1.55; color: var(--ink-2); max-width: 36rem; margin-top: 1.1rem; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

/* ---------- Masthead ---------- */
.mast {
  display: flex; align-items: center; gap: 1rem 1.75rem; flex-wrap: wrap;
  padding: .75rem var(--gutter);
  border-bottom: var(--line) solid var(--ink);
  background: var(--sheet);
}
.wordmark {
  display: inline-flex; align-items: center; gap: .6rem;
  color: var(--ink); text-decoration: none;
  font: 800 1.2rem/1 var(--display); font-stretch: condensed; text-transform: uppercase; letter-spacing: .04em;
  white-space: nowrap;
}
.wordmark svg { width: 38px; height: 20px; flex: none; }
.wordmark:hover { color: var(--ink); }
.mast nav { margin-left: auto; display: flex; gap: .25rem 1.25rem; flex-wrap: wrap; font: 500 .95rem/1 var(--body); }
.mast nav a { color: var(--ink-2); text-decoration: none; padding: .4rem 0; border-bottom: 2px solid transparent; }
.mast nav a:hover, .mast nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }
.mast nav a.nav-j:hover, .mast nav a.nav-j[aria-current="page"] { border-bottom-color: var(--blue); }
.mast nav a.nav-o:hover, .mast nav a.nav-o[aria-current="page"] { border-bottom-color: var(--red); }
.mast .signin { font-family: var(--mono); font-size: .85rem; }
@media (max-width: 600px) {
  .mast nav { margin-left: 0; width: 100%; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font: 600 1rem/1 var(--body);
  padding: .8rem 1.15rem;
  border: var(--line) solid var(--ink);
  border-radius: var(--r);
  background: var(--ink); color: var(--sheet);
  text-decoration: none; cursor: pointer;
  transition: transform .08s ease;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: var(--sheet); }
.btn:active { transform: translateY(1px); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--accent-wash); color: var(--ink); border-color: var(--accent); }
.btn[disabled], .btn[aria-disabled="true"] { opacity: .55; cursor: not-allowed; }

/* ---------- The sheet (Jamie's track: drawing sheet) ---------- */
.sheet {
  position: relative;
  max-width: calc(var(--col) + var(--margin) + 7rem);
  margin: 1.5rem auto 3rem;
  padding: 2.25rem clamp(1rem, 4vw, 3rem) 3rem;
  background: var(--sheet);
}
[data-track="j"] .sheet {
  border: var(--line) solid var(--ink);
  outline: 1px solid var(--rule-strong);
  outline-offset: 6px;
  margin-inline: max(1.25rem, calc((100% - (var(--col) + var(--margin) + 7rem)) / 2));
}
/* zone references along the top border, like the border of a drawing */
.zones {
  position: absolute; top: -1px; left: 0; right: 0; height: 14px;
  display: flex; pointer-events: none;
  border-bottom: 1px solid var(--rule);
}
.zones span {
  flex: 1; text-align: center;
  font: 600 .62rem/14px var(--mono); color: var(--ink-3);
  border-left: 1px solid var(--rule);
}
.zones span:first-child { border-left: 0; }
[data-track="o"] .zones { display: none; }

/* body of the sheet: reading column + margin column */
.sheet-grid {
  display: grid;
  grid-template-columns: minmax(0, var(--col)) minmax(0, var(--margin));
  gap: 3.5rem;
  justify-content: space-between;
  margin-top: 2.5rem;
}
.lesson > section:first-child > h2:first-child { margin-top: 0; }
.margin-col { position: relative; }
.margin-col .sticky { position: sticky; top: 1.25rem; }
@media (max-width: 960px) {
  .sheet-grid { grid-template-columns: minmax(0, 1fr); gap: 2rem; }
  .margin-col { order: -1; }
  .margin-col .sticky { position: static; }
}
@media (max-width: 600px) {
  [data-track="j"] .sheet { margin: 1rem .75rem 2rem; outline-offset: 3px; padding-top: 1.75rem; }
  .zones span:nth-child(n+5) { display: none; }
}

/* ---------- Oliver's track: the exercise book ---------- */
[data-track="o"] .sheet {
  max-width: calc(var(--col) + var(--margin) + 9rem);
  padding-left: clamp(1.75rem, 7vw, 5.5rem);
}
[data-track="o"] .sheet::before { /* the margin rule */
  content: ""; position: absolute; top: 0; bottom: 0;
  left: clamp(.9rem, 4.5vw, 3.75rem);
  border-left: 2px solid var(--red);
  opacity: .55;
}

/* ---------- Title block (the lesson header) ---------- */
.titleblock {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 1.1fr) minmax(0, 1.1fr) minmax(0, .9fr);
  border: var(--line) solid var(--ink);
  background: var(--card);
}
.tb-cell {
  padding: .55rem .75rem .65rem;
  border-left: 1px solid var(--ink);
  border-top: 1px solid var(--ink);
  min-width: 0;
}
.tb-cell .label { display: block; margin-bottom: .2rem; }
.tb-value { font: 600 .98rem/1.3 var(--mono); color: var(--ink); overflow-wrap: anywhere; }
.tb-title { grid-column: 1 / 2; grid-row: 1 / 3; border-left: 0; border-top: 0; padding: .9rem 1.1rem 1.1rem; }
.tb-title h1 { margin-top: .35rem; font-size: clamp(1.9rem, 4.6vw, 3rem); }
.tb-title .tb-track { color: var(--accent); }
.tb-no { grid-column: 2 / 5; border-top: 0; background: var(--machine); color: var(--on-machine); border-left-color: var(--ink); }
.tb-no .label { color: var(--on-machine); opacity: .8; }
.tb-no .tb-value { font-size: clamp(1.3rem, 2.6vw, 1.75rem); color: var(--on-machine); letter-spacing: .02em; }
.tb-foot { grid-column: 1 / -1; border-left: 0; display: flex; flex-wrap: wrap; gap: .4rem 1.5rem; }
.tb-foot .label { display: inline; margin: 0; }
@media (max-width: 720px) {
  .titleblock { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .tb-title { grid-column: 1 / -1; grid-row: auto; }
  .tb-no { grid-column: 1 / -1; border-left: 0; border-top: 1px solid var(--ink); }
  .tb-no + .tb-cell { border-left: 0; }
  .tb-cell { padding: .5rem .6rem .55rem; }
  .tb-value { font-size: .9rem; }
}

/* Oliver: the title block becomes an exercise-book cover label */
[data-track="o"] .titleblock {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  border: 2px solid var(--ink);
  border-radius: var(--r-book);
  box-shadow: inset 0 0 0 4px var(--card), inset 0 0 0 5px var(--rule-strong);
  padding: .9rem 1.25rem 1.1rem;
  max-width: 44rem;
}
[data-track="o"] .tb-cell { border: 0; padding: .4rem 0; display: flex; align-items: baseline; gap: .6rem; }
[data-track="o"] .tb-cell .label { flex: none; margin: 0; }
[data-track="o"] .tb-cell .tb-value { flex: 1; border-bottom: 1px dotted var(--rule-strong); padding-bottom: .1rem; font-family: var(--body); font-weight: 600; }
[data-track="o"] .tb-title { grid-column: 1 / -1; grid-row: auto; display: block; padding: 0 0 .6rem; }
[data-track="o"] .tb-no { grid-column: 1 / -1; background: none; color: var(--ink); order: -1; padding-top: 0; }
[data-track="o"] .tb-no .label, [data-track="o"] .tb-no .tb-value { color: var(--ink); }
[data-track="o"] .tb-no .tb-value { font-size: 1rem; font-family: var(--mono); }
[data-track="o"] .tb-foot { display: flex; }
[data-track="o"] .tb-foot .tb-value { border: 0; }
@media (max-width: 600px) {
  [data-track="o"] .titleblock { grid-template-columns: minmax(0, 1fr); padding: .8rem 1rem 1rem; }
}

/* ---------- Learning outcomes: item balloons ---------- */
.balloon {
  display: inline-grid; place-items: center;
  width: 1.85rem; height: 1.85rem; flex: none;
  border: var(--line) solid var(--ink); border-radius: 50%;
  font: 600 .82rem/1 var(--mono); color: var(--ink); background: var(--card);
}
.outcomes { margin-top: 2rem; }
.outcomes > h2 { margin-top: 0; font-size: 1.25rem; }
.outcomes ol { list-style: none; padding: 0; margin: .9rem 0 0; counter-reset: out; display: grid; gap: .6rem; }
.outcomes li { counter-increment: out; display: grid; grid-template-columns: 2.6rem minmax(0, 1fr); align-items: start; margin: 0; }
.outcomes li::before {
  content: counter(out);
  display: grid; place-items: center; width: 1.85rem; height: 1.85rem;
  border: var(--line) solid var(--accent); border-radius: 50%;
  font: 600 .82rem/1 var(--mono); color: var(--accent);
  position: relative; top: .05rem;
}
.outcomes li > *:first-child { margin-top: 0; }

/* ---------- Lesson sections ---------- */
.lesson { min-width: 0; }
.part { scroll-margin-top: 1rem; }
.part > h2 { display: flex; align-items: baseline; gap: .7rem; }
.part-no {
  font: 600 .85rem/1 var(--mono); color: var(--accent);
  border: 1px solid var(--accent); padding: .3rem .4rem; border-radius: var(--r);
  position: relative; top: -.25rem; flex: none;
}
.remember {
  margin-top: 1.75rem; padding: .9rem 0 .9rem 1.1rem;
  border-left: 4px solid var(--accent);
  font: 600 1.15rem/1.45 var(--body);
}
.remember::before { content: "Remember"; display: block; font: 600 .7rem/1.2 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin-bottom: .3rem; }

/* contents list in the margin column */
.contents { font-size: .95rem; }
.contents ol { list-style: none; padding: 0; margin: .6rem 0 0; border-top: 1px solid var(--rule); }
.contents li { margin: 0; border-bottom: 1px solid var(--rule); }
.contents a { display: flex; gap: .6rem; padding: .45rem 0; color: var(--ink-2); text-decoration: none; }
.contents a:hover { color: var(--ink); }
.contents a span:first-child { font-family: var(--mono); color: var(--accent); min-width: 1.5rem; }

/* ---------- Diagram slot ---------- */
.diagram {
  margin: 2rem 0 0;
  border: 1px solid var(--rule-strong);
  background: var(--card);
  padding: 1rem;
}
.diagram svg { width: 100%; height: auto; overflow: visible; }
.diagram figcaption {
  display: flex; gap: .75rem; align-items: baseline;
  margin-top: .8rem; padding-top: .6rem; border-top: 1px solid var(--rule);
  font-size: .92rem; color: var(--ink-2);
}
.diagram figcaption .label { flex: none; color: var(--accent); }
/* SVG classes — drawing line conventions, coloured from tokens so dark mode works */
.dg-line   { fill: none; stroke: var(--ink); stroke-width: 2; stroke-linejoin: round; }
.dg-thin   { fill: none; stroke: var(--ink-2); stroke-width: 1; }
.dg-hidden { fill: none; stroke: var(--ink-2); stroke-width: 1.25; stroke-dasharray: 6 4; }
.dg-centre { fill: none; stroke: var(--ink-3); stroke-width: 1; stroke-dasharray: 18 4 3 4; }
.dg-accent { fill: none; stroke: var(--accent); stroke-width: 2.25; }
.dg-fill   { fill: var(--sheet-2); stroke: var(--ink); stroke-width: 2; }
.dg-hatch  { fill: url(#hatch); stroke: var(--ink); stroke-width: 2; }
.dg-text   { fill: var(--ink); font: 600 15px var(--mono); }
.dg-small  { fill: var(--ink-2); font: 400 13px var(--mono); }
.dg-balloon circle { fill: var(--card); stroke: var(--ink); stroke-width: 1.5; }
.dg-balloon text { fill: var(--ink); font: 600 13px var(--mono); text-anchor: middle; dominant-baseline: central; }
.dg-leader { fill: none; stroke: var(--ink); stroke-width: 1; }
.dg-arrow  { fill: var(--ink); }

/* ---------- Worked example chat (written transcript, never live) ---------- */
.chat {
  margin: 2rem 0 0;
  border: var(--line) solid var(--ink);
  background: var(--card);
}
.chat-head {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: .3rem 1rem;
  padding: .55rem .9rem;
  background: var(--sheet-2);
  border-bottom: 1px solid var(--ink);
}
.chat-head .label { color: var(--ink-2); }
.chat-head .chat-title { font: 700 1.05rem/1.25 var(--display); font-stretch: condensed; color: var(--ink); text-transform: none; letter-spacing: 0; }
.chat-log { list-style: none; margin: 0; padding: 0; }
.turn {
  display: grid; grid-template-columns: 7.5rem minmax(0, 1fr);
  margin: 0; border-top: 1px solid var(--rule);
}
.turn:first-child { border-top: 0; }
.turn .who {
  padding: .8rem .9rem;
  font: 600 .72rem/1.35 var(--mono); letter-spacing: .1em; text-transform: uppercase;
  color: var(--ink-3);
  border-right: 1px solid var(--rule);
}
.turn .said { padding: .75rem 1rem .85rem; min-width: 0; overflow-wrap: anywhere; }
.turn .said > :first-child { margin-top: 0; }
.turn.you .who { color: var(--accent); }
.turn.you .said { font-weight: 500; }
.turn.ai .said { background: var(--sheet); }
.turn.note { grid-template-columns: 7.5rem minmax(0, 1fr); background: var(--accent-wash); }
.turn.note .who { color: var(--accent); }
.turn.note .said { font-size: .95rem; font-style: italic; color: var(--ink-2); }
.chat-foot { padding: .55rem .9rem; border-top: 1px solid var(--ink); font-size: .85rem; color: var(--ink-3); }
@media (max-width: 600px) {
  .turn, .turn.note { grid-template-columns: minmax(0, 1fr); }
  .turn .who { border-right: 0; padding: .65rem .9rem 0; }
  .turn .said { padding-top: .3rem; }
}

/* ---------- Callouts: a feature-control-frame head + body ---------- */
.callout {
  position: relative;
  margin: 2rem 0 0;
  border: var(--line) solid var(--ink);
  background: var(--card);
}
.callout > :not(.fcf) { margin-left: 1.1rem; margin-right: 1.1rem; }
.callout > :last-child { margin-bottom: 1rem; }
.fcf { /* the segmented head, like a feature control frame */
  display: flex; flex-wrap: wrap; margin: 0;
  border-bottom: 1px solid var(--ink);
  font: 600 .74rem/1.2 var(--mono); letter-spacing: .1em; text-transform: uppercase;
}
.fcf > span { padding: .5rem .75rem; border-right: 1px solid var(--ink); display: inline-flex; align-items: center; }
.fcf > span:last-child { border-right: 0; }
.fcf::before { /* symbol cell */
  content: ""; width: 2.4rem; min-height: 2rem; flex: none;
  border-right: 1px solid var(--ink);
  background-color: currentColor;
  -webkit-mask: var(--icon) center / 16px 16px no-repeat; mask: var(--icon) center / 16px 16px no-repeat;
}

/* data rule: customer drawings are customer IP. Hatched band = a section cut: do not cross. */
.callout.data-rule { padding-left: 14px; }
.callout.data-rule::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 14px;
  border-right: 1px solid var(--ink);
  background: repeating-linear-gradient(45deg, var(--ink) 0 1.5px, transparent 1.5px 6px);
}
.callout.data-rule .fcf { color: var(--ink); background: var(--sheet-2); }
.callout.data-rule .fcf::before { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='6.3' fill='none' stroke='black' stroke-width='1.6'/%3E%3Cpath d='M3.6 12.4 12.4 3.6' stroke='black' stroke-width='1.6'/%3E%3C/svg%3E"); }

/* check: verify on the machine / check the answer */
.callout.check { border-color: var(--ok); }
.callout.check .fcf { color: var(--ok); border-bottom-color: var(--ok); background: var(--ok-wash); }
.callout.check .fcf > span, .callout.check .fcf::before { border-color: var(--ok); }
.callout.check .fcf::before { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Crect x='1.5' y='1.5' width='13' height='13' fill='none' stroke='black' stroke-width='1.4'/%3E%3Cpath d='M4.2 8.3 7 11 11.9 5' fill='none' stroke='black' stroke-width='1.8'/%3E%3C/svg%3E"); }

/* jcq: exam rules (Oliver's track) */
.callout.jcq { border-color: var(--red); }
.callout.jcq .fcf { color: var(--red); border-bottom-color: var(--red); background: var(--red-wash); }
.callout.jcq .fcf > span, .callout.jcq .fcf::before { border-color: var(--red); }
.callout.jcq .fcf::before { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 1.5h7l3 3v10H3z' fill='none' stroke='black' stroke-width='1.4'/%3E%3Cpath d='M5.5 7h5M5.5 9.5h5M5.5 12h3' stroke='black' stroke-width='1.3'/%3E%3C/svg%3E"); }

.callout .src { font-size: .82rem; color: var(--ink-3); }

/* ---------- Key terms ---------- */
.terms {
  border: var(--line) solid var(--ink);
  background: var(--card);
  font-size: .95rem;
}
.terms > h2, .terms > h3 {
  margin: 0; padding: .55rem .9rem;
  font: 600 .74rem/1.2 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink);
  border-bottom: 1px solid var(--ink); background: var(--sheet-2);
}
.terms dl { margin: 0; }
.terms dt { padding: .65rem .9rem 0; font-weight: 700; color: var(--accent); }
.terms dd { margin: 0; padding: .15rem .9rem .65rem; border-bottom: 1px solid var(--rule); color: var(--ink-2); }
.terms dd:last-child { border-bottom: 0; }
.margin-col .terms + .contents, .margin-col .contents + .terms { margin-top: 1.5rem; }

/* ---------- Quiz (rendered by assets/js/quiz.js from a JSON block) ---------- */
.quiz {
  margin-top: 3.5rem;
  border-top: var(--line) solid var(--ink);
  padding-top: 1.25rem;
}
.quiz > h2 { margin-top: 0; }
.quiz-meta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 1rem; margin-top: .4rem; }
.quiz-progress { font: 600 .8rem/1.2 var(--mono); color: var(--ink-3); }
.q {
  margin-top: 1.5rem;
  border: 1px solid var(--rule-strong);
  background: var(--card);
}
.q-stem {
  margin: 0; padding: .85rem 1rem;
  display: grid; grid-template-columns: 2.6rem minmax(0, 1fr); gap: .25rem;
  font-weight: 600; border-bottom: 1px solid var(--rule);
}
.q-no { font: 600 .82rem/1.9 var(--mono); color: var(--accent); }
.q-opts { display: grid; gap: 0; }
.q-opt {
  display: grid; grid-template-columns: 2.6rem minmax(0, 1fr) auto; align-items: center; gap: .25rem;
  width: 100%; text-align: left;
  padding: .7rem 1rem;
  font: 400 1rem/1.45 var(--body); color: var(--ink);
  background: transparent; border: 0; border-top: 1px solid var(--rule);
  cursor: pointer;
}
.q-opt:first-child { border-top: 0; }
.q-opt:hover { background: var(--accent-wash); }
.q-opt:focus-visible { outline-offset: -3px; }
.q-key {
  display: grid; place-items: center; width: 1.7rem; height: 1.7rem;
  border: 1px solid var(--ink-2); border-radius: 50%;
  font: 600 .78rem/1 var(--mono); color: var(--ink-2);
}
.q-mark { font: 600 .74rem/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.q.answered .q-opt { cursor: default; }
.q.answered .q-opt:hover { background: transparent; }
.q-opt.is-right { background: var(--ok-wash) !important; }
.q-opt.is-right .q-key { background: var(--ok); border-color: var(--ok); color: var(--card); }
.q-opt.is-right .q-mark { color: var(--ok); }
.q-opt.is-wrong { background: var(--bad-wash) !important; }
.q-opt.is-wrong .q-key { background: var(--bad); border-color: var(--bad); color: var(--card); }
.q-opt.is-wrong .q-mark { color: var(--bad); }
.q-opt.is-wrong > span:nth-child(2) { text-decoration: line-through; text-decoration-thickness: 1px; }
.q-why { margin: 0; padding: .8rem 1rem .9rem; border-top: 1px solid var(--rule); font-size: .97rem; color: var(--ink-2); }
.q-why[hidden] { display: none; }
.q-why b { color: var(--ink); }
.quiz-result {
  margin-top: 1.5rem; padding: 1rem 1.1rem;
  border: var(--line) solid var(--ink); background: var(--sheet-2);
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .75rem 1.5rem;
}
.quiz-result[hidden] { display: none; }
.quiz-score { font: 700 1.6rem/1 var(--display); font-stretch: condensed; }
.quiz-score small { display: block; margin-top: .35rem; font: 400 .95rem/1.4 var(--body); color: var(--ink-2); }
.quiz-error { color: var(--bad); }

/* ---------- Prev / next ---------- */
.pager {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  margin-top: 3.5rem; border: var(--line) solid var(--ink);
}
.pager a {
  display: block; padding: .9rem 1.1rem; text-decoration: none; color: var(--ink); min-width: 0;
}
.pager a + a, .pager span + a { border-left: 1px solid var(--ink); text-align: right; }
.pager a:hover { background: var(--accent-wash); }
.pager .label { display: block; margin-bottom: .25rem; }
.pager strong { font: 700 1.1rem/1.25 var(--display); font-stretch: condensed; }
.pager .next { grid-column: 2; }
@media (max-width: 520px) {
  .pager { grid-template-columns: minmax(0, 1fr); }
  .pager .next { grid-column: 1; }
  .pager a + a, .pager span + a { border-left: 0; border-top: 1px solid var(--ink); text-align: left; }
}

/* ---------- Home ---------- */
.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  max-width: 76rem; margin: 0 auto;
  padding: clamp(2rem, 6vw, 4.5rem) var(--gutter) 2.5rem;
  align-items: start;
}
.home-hero h1 { font-size: clamp(2.3rem, 5.6vw, 3.9rem); }
.home-hero .label { color: var(--ink-2); }
@media (max-width: 880px) { .home-hero { grid-template-columns: minmax(0, 1fr); } }

/* the drawing register: the course list as a ruled register, not cards */
.register { border: var(--line) solid var(--ink); background: var(--card); }
.register-head {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  padding: .55rem .9rem; border-bottom: var(--line) solid var(--ink); background: var(--machine); color: var(--on-machine);
}
.register-head .label { color: var(--on-machine); }
.register table { width: 100%; border-collapse: collapse; font-size: .95rem; }
.register caption { text-align: left; padding: .6rem .9rem .5rem; font: 600 .74rem/1.2 var(--mono); letter-spacing: .12em; text-transform: uppercase; border-bottom: 1px solid var(--ink); }
.register caption.j { color: var(--blue); }
.register caption.o { color: var(--red); border-top: var(--line) solid var(--ink); }
.register th, .register td { text-align: left; padding: .5rem .9rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
.register thead th { font: 600 .66rem/1.2 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.register td:first-child { font-family: var(--mono); font-weight: 600; white-space: nowrap; width: 1%; }
.register td.status { font: 600 .74rem/1.6 var(--mono); color: var(--ink-3); white-space: nowrap; width: 1%; }
.register td.status.issued { color: var(--ok); }
.register tr:last-child td { border-bottom: 0; }
@media (max-width: 480px) {
  .register th:last-child, .register td.status { display: none; }
  .register th, .register td { padding: .5rem .6rem; }
}

.tracks {
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  max-width: 76rem; margin: 0 auto; padding: 1.5rem var(--gutter) 3rem;
  align-items: start;
}
.track { position: relative; padding: 1.5rem 1.4rem 1.6rem; background: var(--card); }
.track h2 { margin-top: .35rem; }
.track ul { margin-top: .9rem; }
.track .btn { margin-top: 1.4rem; }
.track-j { border: var(--line) solid var(--ink); outline: 1px solid var(--rule-strong); outline-offset: 5px; }
.track-j .label { color: var(--blue); }
.track-o {
  border: 2px solid var(--ink); border-radius: var(--r-book);
  box-shadow: inset 0 0 0 4px var(--card), inset 0 0 0 5px var(--rule-strong);
  padding-left: 2.4rem;
  background: var(--card) repeating-linear-gradient(to bottom, transparent 0 calc(1.75em - 1px), var(--feint) calc(1.75em - 1px) 1.75em);
  margin-top: 2.5rem;
}
.track-o::before { content: ""; position: absolute; top: 5px; bottom: 5px; left: 1.4rem; border-left: 2px solid var(--red); opacity: .55; }
.track-o .label { color: var(--red); }
@media (max-width: 880px) {
  .tracks { grid-template-columns: minmax(0, 1fr); }
  .track-o { margin-top: 0; }
}

.how { max-width: 76rem; margin: 0 auto; padding: 0 var(--gutter) 3.5rem; }
.how-list { list-style: none; padding: 0; margin: 1rem 0 0; border-top: 1px solid var(--ink); display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); column-gap: 1.5rem; }
@media (max-width: 900px) { .how-list { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 520px) { .how-list { grid-template-columns: minmax(0, 1fr); } }
.how-list li { margin: 0; padding: 1rem 1.25rem 1.2rem 0; border-bottom: 1px solid var(--rule); }
.how-list li strong { display: block; font: 700 1.1rem/1.25 var(--display); font-stretch: condensed; }
.how-list li p { margin-top: .35rem; color: var(--ink-2); font-size: .97rem; }

/* ---------- Forms (sign-in) ---------- */
.form-panel { max-width: 32rem; margin: clamp(1.5rem, 6vw, 4rem) auto; padding: 0 var(--gutter); flex: 1 0 auto; width: 100%; }
.form-sheet { border: var(--line) solid var(--ink); outline: 1px solid var(--rule-strong); outline-offset: 5px; background: var(--card); }
.form-sheet .register-head { border-bottom: var(--line) solid var(--ink); }
.form-body { padding: 1.25rem clamp(1rem, 4vw, 1.75rem) 1.75rem; }
body:has(.form-panel) { min-height: 100dvh; display: flex; flex-direction: column; }
.field { display: grid; gap: .4rem; margin-top: 1.25rem; }
.field label { font-weight: 600; }
.field input {
  font: 400 1.05rem/1.4 var(--body); color: var(--ink);
  padding: .75rem .85rem; border: var(--line) solid var(--ink); border-radius: var(--r);
  background: var(--card); width: 100%;
}
.field input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.field .hint { font-size: .9rem; color: var(--ink-3); margin: 0; }
.field .error { font-size: .9rem; color: var(--bad); margin: 0; }
.field .error:empty { display: none; }
.form-status { margin-top: 1rem; padding: .75rem .9rem; border: 1px solid var(--rule-strong); background: var(--sheet-2); }
.form-status[hidden] { display: none; }
.or { display: flex; align-items: center; gap: .75rem; margin: 1.5rem 0; color: var(--ink-3); font: 600 .72rem/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.or::before, .or::after { content: ""; flex: 1; border-top: 1px solid var(--rule); }

/* ---------- Forms, continued (select, status states, account, pricing) ---------- */
.field select {
  font: 400 1.05rem/1.4 var(--body); color: var(--ink);
  padding: .75rem .85rem; border: var(--line) solid var(--ink); border-radius: var(--r);
  background: var(--card); width: 100%;
}
.field select:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.field .trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-status[data-state="ok"] { border-color: var(--ok); background: var(--ok-wash); }
.form-status[data-state="bad"] { border-color: var(--bad); background: var(--bad-wash); }
.form-status strong { font-family: var(--mono); font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; margin-right: .4rem; }
.form-panel.wide { max-width: 44rem; }
.form-body h2 { font-size: 1.35rem; margin-top: 2rem; }
.form-body h2:first-of-type { margin-top: 1.5rem; }
.form-body .small { font-size: .92rem; color: var(--ink-3); }
.pk-table { width: 100%; border-collapse: collapse; margin-top: .75rem; font-size: .95rem; }
.pk-table th, .pk-table td { text-align: left; padding: .5rem .5rem .5rem 0; border-bottom: 1px solid var(--rule); vertical-align: middle; }
.pk-table thead th { font: 600 .66rem/1.2 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.pk-table td.act { text-align: right; padding-right: 0; }
.btn.small { padding: .45rem .7rem; font-size: .9rem; }
.btn.danger { background: transparent; color: var(--bad); border-color: var(--bad); }
.btn.danger:hover { background: var(--bad); color: var(--sheet); border-color: var(--bad); }
.enrol { border: var(--line) solid var(--accent); background: var(--accent-wash); padding: .9rem 1rem 1rem; margin-top: 1.25rem; }
.enrol[hidden] { display: none; }
.enrol p { margin: 0 0 .75rem; }
.enrol .row { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; }
.danger-zone { margin-top: 2.25rem; border-top: var(--line) solid var(--bad); padding-top: .25rem; }
.danger-zone summary { cursor: pointer; font-weight: 600; color: var(--bad); padding: .6rem 0; }

/* pricing: the schedule is a ruled table, not cards */
.pricing { max-width: 56rem; margin: 0 auto; padding: clamp(2rem, 6vw, 4rem) var(--gutter) 3rem; }
.price-sheet { margin-top: 2rem; border: var(--line) solid var(--ink); background: var(--card); }
.price-sheet table { width: 100%; border-collapse: collapse; }
.price-sheet th, .price-sheet td { text-align: left; padding: .8rem .95rem; border-bottom: 1px solid var(--rule); vertical-align: baseline; }
.price-sheet thead th { font: 600 .66rem/1.2 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.price-sheet tbody th { font: 700 1.25rem/1.2 var(--display); font-stretch: condensed; }
.price-sheet td.amount { font: 700 1.9rem/1 var(--display); font-stretch: condensed; white-space: nowrap; }
.price-sheet td.amount span { font: 600 .8rem/1 var(--mono); color: var(--ink-3); letter-spacing: .06em; }
.price-sheet tr:last-child th, .price-sheet tr:last-child td { border-bottom: 0; }
.price-note { margin: 0; padding: .65rem .95rem; border-top: var(--line) solid var(--ink); background: var(--sheet-2); font-size: .92rem; }
@media (max-width: 560px) { .price-sheet th, .price-sheet td { padding: .65rem .6rem; } .price-sheet td.amount { font-size: 1.5rem; } }
.pricing .interest { margin-top: 3rem; }

/* ---------- Footer ---------- */
.foot {
  background: var(--machine); color: var(--on-machine);
  padding: 1.75rem var(--gutter) 2rem;
  font-size: .9rem;
}
.foot-inner { max-width: 76rem; margin: 0 auto; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem 2rem; }
.foot a { color: var(--on-machine); }
.foot p { margin: 0; max-width: 40rem; }
.foot .label { color: var(--on-machine); opacity: .75; }

/* ---------- Motion: functional only ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

/* ---------- Print: lessons print as clean sheets ---------- */
@media print {
  .mast nav, .pager, .quiz, .skip { display: none !important; }
  body { background: #fff; color: #000; }
  .sheet { margin: 0; outline: 0; }
}