main { padding-top: var(--header-height); }

.page-hero { position: relative; overflow: hidden; padding: 112px 0 90px; border-bottom: 1px solid var(--border); }
.page-hero::after {
  content: "";
  position: absolute;
  top: -220px;
  right: -110px;
  width: 480px;
  height: 480px;
  border: 1px solid var(--border);
  border-radius: 50%;
  box-shadow: 0 0 0 48px color-mix(in srgb, var(--peach) 12%, transparent), 0 0 0 100px color-mix(in srgb, var(--lemon) 25%, transparent);
  pointer-events: none;
}
.page-hero .section-kicker { margin-bottom: 24px; }
.page-hero h1 { max-width: 15ch; margin: 0 0 28px; font-size: clamp(40px, 6.4vw, 76px); }
.page-hero-lede { max-width: 58ch; margin: 0; font-size: 17px; line-height: 1.65; color: var(--ink-muted); }
.page-hero-meta { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 36px; font: var(--text-ui)/1.5 var(--mono); text-transform: uppercase; letter-spacing: 0.07em; color: var(--ink-muted); }
.page-hero-meta span::before { content: "↗"; margin-right: 7px; color: var(--accent); }

.page-content { padding: 95px 0 150px; }

.eyebrow-chip { display: inline-flex; align-items: center; gap: 9px; padding: 9px 11px; border: 1px solid var(--border); font: var(--text-micro)/1.3 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; }
.eyebrow-chip::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

.split-layout { display: grid; grid-template-columns: 220px 1fr; gap: 75px; }

.side-index { position: sticky; top: calc(var(--header-height) + 34px); align-self: start; }
.side-index p { margin: 0 0 22px; color: var(--accent); font: var(--text-ui)/1 var(--mono); text-transform: uppercase; letter-spacing: 0.1em; }
.side-index a { display: block; padding: 10px 0; border-bottom: 1px solid var(--border); font: var(--text-ui)/1.5 var(--mono); color: var(--ink-muted); transition: color 0.25s ease; }
.side-index a:hover, .side-index a.is-current { color: var(--accent); opacity: 1; }

.content-column { min-width: 0; }
.content-column h2 { margin: 0 0 22px; font-size: clamp(30px, 3.4vw, 46px); }
.content-column > p { max-width: 68ch; font-size: 15px; line-height: 1.75; color: var(--ink-muted); }

.doc-block { padding: 40px 0; border-bottom: 1px solid var(--border); }
.doc-block:first-child { padding-top: 0; }
.doc-block:last-child { border-bottom: 0; }
.doc-block h3 { margin: 0 0 12px; font-size: 22px; letter-spacing: -0.02em; }
.doc-block h3 span { margin-right: 12px; color: var(--accent); font: var(--text-ui)/1 var(--mono); letter-spacing: 0.04em; }
.doc-block p { max-width: 68ch; font-size: 15px; line-height: 1.75; color: var(--ink-muted); }

/* Inline code in prose picks up the mono face but nothing else: the snippets in
   .code-card are already mono and must not be scaled by this. */
.content-column code { font-family: var(--mono); font-size: 0.93em; }

/* The peach shadow is a hard 9px offset rather than a blur, so it occupies
   real layout-adjacent space: following content has to clear it or the shadow
   strikes through the first line. Sibling margins collapse, so two stacked
   cards still get one 34px gap rather than the sum. */
.code-card { overflow: hidden; margin: 25px 0 34px; border-radius: 5px; background: var(--code-bg); color: var(--code-fg); box-shadow: 9px 9px 0 var(--peach); }
/* Last in a block, the shadow would otherwise hang into the section break. */
.doc-block > .code-card:last-child { margin-bottom: 25px; }
.code-card-bar { min-height: 44px; display: flex; align-items: center; gap: 9px; padding: 9px 15px; border-bottom: 1px solid var(--code-line); font: var(--text-ui)/1 var(--mono); opacity: 0.82; }
.code-card-bar i { width: 6px; height: 6px; display: block; border-radius: 50%; background: var(--peach); }
.code-card pre { margin: 0; padding: 22px 25px 26px; overflow: auto; font: 12px/1.9 var(--mono); }
.code-card .accent { color: var(--peach); }
/* In-page annotations for a snippet: which line the checker accepts, and which
   one it refuses. Shares the failure tint already used by the REPL output. */
.code-card .muted { color: color-mix(in srgb, var(--code-fg) 60%, transparent); }
.code-card .bad { color: #ff9d8a; }

/* The reference tables carry verdicts rather than prose, so they read as spec
   sheets: the term on the left, what is legal on the right. */
.spec-list { margin: 26px 0 0; border-top: 1px solid var(--border-strong); }
.spec-line { display: flex; align-items: baseline; justify-content: space-between; gap: 22px; padding: 11px 2px; border-bottom: 1px solid var(--border); font: var(--text-ui-lg)/1.45 var(--mono); }
.spec-line dt { color: var(--ink-muted); }
.spec-line dd { margin: 0; text-align: right; }
.spec-line code { font: inherit; color: var(--accent); }
.spec-line .no { color: color-mix(in srgb, var(--ink-faint) 65%, transparent); }

.info-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 11px; margin-top: 26px; }
.info-tile { min-height: 150px; padding: 21px; border: 1px solid var(--border); background: var(--surface); }
.info-tile strong { display: block; margin-bottom: 11px; font-size: 16px; letter-spacing: -0.04em; }
.info-tile p { margin: 0; font-size: 13px; line-height: 1.7; color: var(--ink-muted); }

.tracker-head { display: flex; align-items: end; justify-content: space-between; margin-bottom: 45px; }
.tracker-head p { max-width: 38ch; margin: 0; font-size: 14px; line-height: 1.7; color: var(--ink-muted); }

.case-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 13px; margin-top: 55px; }
.case-card { min-height: 330px; padding: 28px; display: flex; flex-direction: column; border: 1px solid var(--border); background: var(--surface); transition: transform 0.35s var(--ease), background 0.25s ease; }
.case-card:hover { transform: translateY(-6px); background: var(--surface-solid); }
.case-card--feature { grid-row: span 2; background: var(--lemon); color: var(--on-accent); }
.case-card--feature:hover { background: var(--lemon); }
.case-card--peach { border-color: transparent; background: var(--peach); color: var(--on-accent); }
.case-card--peach:hover { background: var(--peach); }
.case-type { display: flex; justify-content: space-between; font: var(--text-ui)/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-muted); }
.case-card h2 { max-width: 20ch; margin: 55px 0 16px; font-size: 30px; }
.case-card h3 { margin: 46px 0 13px; font-size: 21px; line-height: 1.1; letter-spacing: -0.02em; }
.case-card p { max-width: 46ch; font-size: 14px; line-height: 1.7; color: var(--ink-muted); }
.case-link { width: max-content; margin-top: auto; padding-bottom: 5px; border-bottom: 1px solid var(--border-strong); font: var(--text-ui)/1.4 var(--mono); }
.case-link:hover { color: var(--accent); }
.case-metric { display: flex; align-items: end; justify-content: space-between; margin-top: auto; padding-top: 19px; border-top: 1px solid var(--border); }
.case-metric strong { font: 34px var(--mono); letter-spacing: -0.04em; }
.case-metric span { font: var(--text-micro)/1.4 var(--mono); color: var(--on-accent-muted); }

/* The accent-coloured case cards carry their own text tint, since --ink-muted
   is built for the paper background and would vanish on lemon or peach. */
.case-card--feature p, .case-card--feature .case-type,
.case-card--peach p, .case-card--peach .case-type { color: var(--on-accent-muted); }

.use-case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; margin-top: 13px; }
/* The cards need their own surface: border-only cards read as holes in the
   page once the paper goes dark. */
.use-card {
  min-height: 205px;
  padding: 24px;
  border: 1px solid var(--border);
  background: var(--surface);
  transition: transform 0.35s var(--ease), background 0.25s ease, border-color 0.25s ease;
}
.use-card:hover { transform: translateY(-5px); background: var(--surface-solid); border-color: var(--border-strong); }
.use-icon { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); }
.use-icon svg { width: 18px; height: 18px; }
.use-card h3 { margin: 28px 0 10px; font-size: 17px; letter-spacing: -0.04em; }
.use-card p { margin: 0; font-size: 13px; line-height: 1.7; color: var(--ink-muted); }

.progress-card { display: grid; grid-template-columns: 120px 1fr 120px; align-items: center; gap: 25px; margin-bottom: 52px; padding: 20px 24px; border: 1px solid var(--border); background: var(--lemon); color: var(--on-accent); }
.progress-card strong { font: 30px var(--mono); letter-spacing: -0.04em; }
.progress-card span { font: var(--text-micro)/1 var(--mono); text-transform: uppercase; color: var(--on-accent-muted); }
.progress-track { height: 4px; background: color-mix(in srgb, var(--on-accent) 16%, transparent); }
.progress-track i { display: block; width: 42%; height: 100%; background: var(--accent); }

.roadmap-filter { display: flex; gap: 7px; margin-bottom: 30px; }
.roadmap-filter button { padding: 9px 12px; border: 1px solid var(--border); background: transparent; color: var(--ink); font: var(--text-ui)/1 var(--mono); }
.roadmap-filter button:hover, .roadmap-filter button.is-selected { background: var(--ink); color: var(--paper); }

.roadmap-list { position: relative; padding-left: 75px; }
.roadmap-list::before { content: ""; position: absolute; top: 7px; bottom: 35px; left: 16px; border-left: 1px dashed var(--border-strong); }
.roadmap-item { position: relative; display: grid; grid-template-columns: 125px 1fr; gap: 38px; padding-bottom: 56px; }
.roadmap-marker { position: absolute; top: 0; left: -75px; width: 34px; height: 34px; display: grid; place-items: center; border: 1px solid var(--border-strong); border-radius: 50%; background: var(--paper); font: var(--text-ui)/1 var(--mono); }
.roadmap-item.is-done .roadmap-marker { background: var(--ink); color: var(--paper); }
.roadmap-date { padding-top: 10px; color: var(--accent); font: var(--text-ui)/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; }
.roadmap-item h3 { margin: 4px 0 11px; font-size: 26px; letter-spacing: -0.025em; }
.roadmap-item p { max-width: 60ch; margin: 0; font-size: 14px; line-height: 1.7; color: var(--ink-muted); }
.roadmap-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 18px; }
.roadmap-tags span { padding: 7px 9px; border: 1px solid var(--border); font: var(--text-micro)/1.3 var(--mono); color: var(--ink-muted); }

.playground-wrap { padding: 76px 0 140px; }
.playground-toolbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.playground-tabs { display: flex; gap: 4px; }
.playground-tabs button { padding: 10px 13px; border: 1px solid var(--border); background: transparent; color: var(--ink); font: var(--text-ui)/1 var(--mono); }
.playground-tabs button.is-active { background: var(--ink); color: var(--paper); }
.run-button { padding: 12px 16px; border: 0; background: var(--peach); color: var(--on-accent); font: var(--text-ui)/1 var(--mono); transition: transform 0.25s ease, opacity 0.25s ease; }
.run-button:hover { transform: translateY(-2px); }
.run-button:disabled { opacity: 0.55; transform: none; cursor: progress; }

.playground-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }
.editor-panel, .output-panel { position: relative; min-height: 500px; border: 1px solid var(--border); background: var(--surface); }
.editor-bar, .output-bar { min-height: 46px; display: flex; align-items: center; justify-content: space-between; padding: 9px 15px; border-bottom: 1px solid var(--border); font: var(--text-ui)/1 var(--mono); }
.editor-bar span { color: var(--ink-muted); }
.output-bar span { color: color-mix(in srgb, var(--code-fg) 80%, transparent); }
/* The editor stacks two layers that must agree exactly: a painted <pre> behind
   and the real textarea in front. Both share the same box, font, line-height,
   padding, and tab-size, so every glyph lands on the same pixel. The textarea's
   own text is transparent, so only the overlay's colours are seen while the
   caret, selection, undo, and IME all stay native. */
.editor-surface { position: relative; }

.editor-highlight,
.editor-panel textarea {
  margin: 0;
  padding: 25px;
  border: 0;
  font: 13px/1.85 var(--mono);
  letter-spacing: normal;
  tab-size: 2;
  white-space: pre-wrap;
  overflow-wrap: break-word;
  word-break: normal;
}

.editor-highlight {
  position: absolute;
  inset: 0;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  color: var(--ink);
}

.editor-highlight code { font: inherit; }

/* The textarea's own text is only hidden once the highlighter has actually
   mounted. If the script never runs — a blocked module, a syntax error, JS off
   — the code must still be readable, so the transparent colour is gated on
   `.is-highlighted` rather than applied unconditionally. */
.editor-panel textarea {
  position: relative;
  display: block;
  width: 100%;
  height: 457px;
  background: transparent;
  color: var(--ink);
  caret-color: var(--ink);
  resize: none;
  overflow: auto;
}

.editor-surface.is-highlighted .editor-panel textarea,
.editor-panel textarea.is-highlighted { color: transparent; }

.editor-panel textarea::selection { background: color-mix(in srgb, var(--accent) 28%, transparent); }
/* The editor is a screenful of code, so a full-perimeter ring shouts louder
   than the content it is supposed to be helping. A rail on the leading edge
   marks focus just as unambiguously without boxing in the whole surface. */
.editor-panel textarea:focus-visible {
  outline: none;
  box-shadow: inset 3px 0 0 var(--focus-ring);
}

.editor-panel:has(textarea:focus-visible) { border-color: var(--focus-ring); }

/* Token colours are drawn from the same ink and accent hues as the rest of the
   system, so the code reads as part of the page rather than a pasted-in theme. */
.tok-keyword { color: var(--accent); font-weight: 500; }
.tok-builtin { color: var(--accent); }
.tok-type { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.tok-number { color: var(--accent); }
.tok-string { color: var(--code-string); }
.tok-comment { color: var(--ink-muted); font-style: italic; }
.tok-decorator { color: var(--code-string); }
.tok-operator, .tok-punctuation { color: var(--ink-muted); }
.tok-name { color: var(--ink); }
.tok-plain { color: var(--ink); }

/* A floating surface reads better as a shadow alone. A hairline border stacked
   under a soft shadow just reads as haze, so the edge is declared once. */
.suggestions {
  position: absolute;
  z-index: 6;
  min-width: 190px;
  max-width: 280px;
  padding: 5px;
  border: 0;
  border-radius: 8px;
  background: var(--surface-solid);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.16), 0 10px 20px -10px rgba(0, 0, 0, 0.24);
}

.suggestion-list { margin: 0; padding: 0; list-style: none; }

.suggestion {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 7px 9px;
  border-radius: 4px;
  cursor: pointer;
}

.suggestion[aria-selected="true"] { background: var(--lemon); color: var(--on-accent); }
.suggestion__label { font: var(--text-ui)/1.3 var(--mono); }
.suggestion__detail { font: var(--text-micro)/1.3 var(--mono); opacity: 0.72; }

.example-list { margin: 0; padding: 18px; list-style: none; }
.example-list li + li { margin-top: 8px; }
.example-item { display: block; width: 100%; padding: 13px 15px; border: 1px solid var(--border); background: var(--paper); text-align: left; transition: border-color 0.25s ease, transform 0.25s var(--ease); }
.example-item:hover { border-color: var(--accent); transform: translateX(3px); }
.example-item strong { display: block; font: 12px var(--mono); }
.example-item span { display: block; margin-top: 5px; font: var(--text-micro)/1.3 var(--mono); color: var(--ink-muted); }
.example-hint { margin: 0 0 14px; padding: 0 3px; font: var(--text-micro)/1.5 var(--mono); color: var(--ink-muted); }

.output-panel { background: var(--code-bg); color: var(--code-fg); }
.output-bar { border-color: var(--code-line); }
.output-bar i { display: inline-block; width: 7px; height: 7px; margin-right: 8px; border-radius: 50%; background: var(--peach); }
.output-content { padding: 25px; overflow-wrap: anywhere; font: 12px/1.95 var(--mono); }
.output-content .prompt { color: var(--peach); }
.output-content .success { color: var(--peach); }
.output-content .muted { color: color-mix(in srgb, var(--code-fg) 80%, transparent); }
.output-content .failure { color: #ff9d8a; }
.output-content .value { color: var(--code-fg); font-weight: 500; }

.playground-note { margin: 18px 0 0; font: var(--text-ui)/1.7 var(--mono); color: var(--ink-muted); }
.playground-note span { color: var(--accent); }

@media (max-width: 800px) {
  .page-hero { padding: 90px 0 70px; }
  .split-layout { grid-template-columns: 1fr; gap: 35px; }
  .side-index { position: static; display: flex; gap: 10px; overflow-x: auto; }
  .side-index p { display: none; }
  .side-index a { padding: 9px 10px; border: 1px solid var(--border); white-space: nowrap; }
  .info-grid, .use-case-grid, .case-grid { grid-template-columns: 1fr; }
  .case-card--feature { grid-row: auto; }
  .tracker-head { display: block; }
  .tracker-head p { margin-top: 20px; }
  .progress-card { grid-template-columns: 1fr 1fr; }
  .progress-track { grid-column: span 2; order: 3; }
  .roadmap-list { padding-left: 46px; }
  .roadmap-list::before { left: 2px; }
  .roadmap-marker { left: -60px; }
  .roadmap-item { grid-template-columns: 1fr; gap: 9px; }
  .playground-grid { grid-template-columns: 1fr; }
  .playground-toolbar { flex-direction: column; align-items: flex-start; gap: 15px; }
  .editor-panel, .output-panel { min-height: 420px; }
  .editor-panel textarea { height: 377px; }
}