/* TB website styles. One file, no build step.
   Brand: cherry (#b3123e) with a marigold cursor, on white by day and on
   aubergine-black by night. Code always sits in an aubergine "editor"
   window, in both themes. */

/* ================================================================ tokens */
:root {
  --bg: #ffffff;
  --bg-soft: #f7f3f5;
  --bg-sunk: #efe9ec;
  --ink: #1d1620;
  --ink-soft: #594e5e;
  --ink-faint: #6e6372;
  --line: #e6dfe3;
  --line-strong: #d4cad0;
  --accent: #b3123e;
  --accent-hover: #93102f;
  --accent-ink: #ffffff;
  --accent-soft: #fbe8ee;
  --accent-text: #a8113a;
  --marigold: #f2a93b;
  --marigold-text: #7a4800;
  --note-bg: #fff4e0;
  --note-line: #eab35a;
  --warn-bg: #fdecef;
  --warn-line: #d9667e;
  --focus: #1d5fd6;
  --error: #b0102f;

  /* the editor window: identical in both themes */
  --code-bg: #1f1724;
  --code-bar: #2a2030;
  --code-out: #261c2b;
  --code-line: #3a2e40;
  --code-ink: #f3eaf0;
  --code-muted: #a796ab;
  --code-key: #ff7a9b;
  --code-str: #ffc66d;
  --code-num: #8fd3ff;
  --code-fn: #c7b3ff;
  --code-com: #9b8aa0;
  --code-err: #ff9cad;

  --shadow-window: 0 1px 0 rgb(255 255 255 / 0.04) inset, 0 24px 48px -24px rgb(31 23 36 / 0.45), 0 2px 6px rgb(31 23 36 / 0.12);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI Variable Text", "Segoe UI", system-ui, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI Variable Display", "Segoe UI", system-ui, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-code: ui-monospace, "Cascadia Code", "Cascadia Mono", "SF Mono", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.1875rem;
  --step-2: clamp(1.35rem, 1.2rem + 0.6vw, 1.6rem);
  --step-3: clamp(1.75rem, 1.4rem + 1.5vw, 2.4rem);
  --step-4: clamp(2.2rem, 1.6rem + 2.6vw, 3.4rem);
  --step-hero: clamp(5rem, 3rem + 10vw, 10.5rem);

  --r-lg: 14px;
  --r: 10px;
  --r-sm: 6px;
  --gutter: clamp(1rem, 0.5rem + 2.2vw, 2rem);
  --wide: 76rem;
  --measure: 68ch;
  --header-h: 4rem;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #151017;
    --bg-soft: #1c161f;
    --bg-sunk: #120d14;
    --ink: #f4eef2;
    --ink-soft: #c2b5c4;
    --ink-faint: #a99cab;
    --line: #322836;
    --line-strong: #44384a;
    --accent: #ff6f8e;
    --accent-hover: #ff8ca5;
    --accent-ink: #1d1620;
    --accent-soft: #3a1b26;
    --accent-text: #ff8ca5;
    --marigold: #f4b450;
    --marigold-text: #f6c372;
    --note-bg: #2e2416;
    --note-line: #a77a2c;
    --warn-bg: #351a23;
    --warn-line: #c4566f;
    --focus: #8cb8ff;
    --error: #ff9cad;
    --code-bg: #1d1522;
    --code-bar: #271e2d;
    --code-out: #221a27;
    --shadow-window: 0 0 0 1px #2f2534, 0 24px 48px -24px rgb(0 0 0 / 0.7);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #151017;
  --bg-soft: #1c161f;
  --bg-sunk: #120d14;
  --ink: #f4eef2;
  --ink-soft: #c2b5c4;
  --ink-faint: #a99cab;
  --line: #322836;
  --line-strong: #44384a;
  --accent: #ff6f8e;
  --accent-hover: #ff8ca5;
  --accent-ink: #1d1620;
  --accent-soft: #3a1b26;
  --accent-text: #ff8ca5;
  --marigold: #f4b450;
  --marigold-text: #f6c372;
  --note-bg: #2e2416;
  --note-line: #a77a2c;
  --warn-bg: #351a23;
  --warn-line: #c4566f;
  --focus: #8cb8ff;
  --error: #ff9cad;
  --code-bg: #1d1522;
  --code-bar: #271e2d;
  --code-out: #221a27;
  --shadow-window: 0 0 0 1px #2f2534, 0 24px 48px -24px rgb(0 0 0 / 0.7);
  color-scheme: dark;
}

/* ================================================================== base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: calc(var(--header-h) + 1rem); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}
main { flex: 1; display: block; }
img, svg { max-width: 100%; height: auto; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 750;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 2.25em 0 0.55em;
  text-wrap: balance;
}
h1 { font-size: var(--step-4); letter-spacing: -0.03em; margin-top: 0; }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-2); }
h4 { font-size: var(--step-1); }
p, ul, ol, dl { margin: 0 0 1em; }
li + li { margin-top: 0.3em; }
strong { font-weight: 650; }
hr { border: 0; border-top: 1px solid var(--line); margin: 3rem 0; }

a { color: var(--accent-text); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--accent-hover); text-decoration-thickness: 2px; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 4px; }

code, kbd, samp, pre { font-family: var(--font-code); }
:not(pre) > code {
  font-size: 0.875em;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 0.08em 0.36em;
  border-radius: 5px;
}
kbd, .kbd {
  display: inline-block;
  font-family: var(--font-code);
  font-size: 0.8em;
  line-height: 1.3;
  padding: 0.12em 0.45em;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--bg);
  color: var(--ink);
  white-space: nowrap;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; margin: -1px; padding: 0; border: 0;
}

/* ================================================================= shell */
.skip-link {
  position: absolute;
  left: 1rem; top: -4rem;
  z-index: 100;
  background: var(--ink);
  color: var(--bg);
  padding: 0.6rem 1rem;
  border-radius: var(--r-sm);
  font-weight: 600;
  text-decoration: none;
}
.skip-link:focus { top: 0.75rem; color: var(--bg); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.03em;
}
.brand:hover { color: var(--ink); }
.brand-mark { width: 2rem; height: 2rem; flex: none; display: block; }
.version-badge {
  font-family: var(--font-code);
  font-size: 0.75rem;
  line-height: 1;
  padding: 0.3rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
}
a.version-badge:hover { color: var(--ink); border-color: var(--accent); }
.site-nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin-left: auto;
}
.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 550;
  font-size: 0.95rem;
  padding: 0.45rem 0.7rem;
  border-radius: var(--r-sm);
}
.site-nav a:hover { color: var(--ink); background: var(--bg-soft); }
.site-nav a[aria-current="page"] { color: var(--ink); background: var(--bg-soft); box-shadow: inset 0 -2px 0 var(--accent); border-radius: var(--r-sm) var(--r-sm) 0 0; }
.site-nav a.nav-cta {
  background: var(--accent);
  color: var(--accent-ink);
  margin-left: 0.4rem;
  padding: 0.45rem 0.9rem;
}
.site-nav a.nav-cta:hover { background: var(--accent-hover); color: var(--accent-ink); }
.site-nav a.nav-cta[aria-current="page"] { box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--accent); border-radius: var(--r-sm); }

.icon-button {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  width: 2.4rem; height: 2.4rem;
  border-radius: var(--r-sm);
  display: inline-grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
  flex: none;
}
.icon-button:hover { background: var(--bg-soft); }
.icon-button svg { width: 1.15rem; height: 1.15rem; }
.theme-toggle { appearance: none; border: 1px solid var(--line); background: transparent; color: var(--ink); width: 2.4rem; height: 2.4rem; border-radius: var(--r-sm); display: inline-grid; place-items: center; cursor: pointer; padding: 0; flex: none; }
.theme-toggle:hover { background: var(--bg-soft); }
.theme-toggle svg { width: 1.1rem; height: 1.1rem; }
.nav-toggle { display: none; }

@media (max-width: 52rem) {
  .header-inner { gap: 0.5rem; }
  .js .nav-toggle { display: inline-grid; margin-left: auto; }
  .js .site-nav {
    display: none;
    order: 10;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0.1rem;
    padding: 0.25rem 0 0.9rem;
    margin: 0;
  }
  .js .site-header.nav-open .site-nav { display: flex; }
  .js .site-nav a { padding: 0.7rem 0.75rem; font-size: 1rem; }
  .js .site-nav a[aria-current="page"] { box-shadow: inset 3px 0 0 var(--accent); border-radius: var(--r-sm); }
  .js .site-nav a.nav-cta { margin: 0.4rem 0 0; text-align: center; }
  .site-nav { flex-wrap: wrap; width: 100%; order: 10; margin: 0; padding-bottom: 0.5rem; }
}

/* footer */
.site-footer {
  margin-top: 6rem;
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.footer-inner {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 3rem var(--gutter) 2rem;
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 10rem), 1fr));
}
.footer-brand { grid-column: 1 / -1; display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem 1rem; }
@media (min-width: 52rem) {
  .footer-inner { grid-template-columns: 1.6fr repeat(3, 1fr); }
  .footer-brand { grid-column: auto; flex-direction: column; align-items: flex-start; }
}
.footer-brand p { margin: 0; max-width: 30ch; }
.site-footer h2 {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0;
  margin: 0 0 0.75rem;
  color: var(--ink);
  font-family: var(--font-sans);
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li + li { margin-top: 0.45rem; }
.site-footer a { color: var(--ink-soft); text-decoration: none; }
.site-footer a:hover { color: var(--accent-text); text-decoration: underline; }
.footer-bottom {
  max-width: var(--wide);
  margin: 0 auto;
  padding: 1.25rem var(--gutter) 2rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  font-size: 0.875rem;
}
.footer-bottom p { margin: 0; }
.footer-heart { color: var(--accent-text); }

/* ================================================================ layout */
.container { width: 100%; max-width: var(--wide); margin: 0 auto; padding: 0 var(--gutter); }
.prose { max-width: var(--measure); }
.lead { font-size: var(--step-1); line-height: 1.6; color: var(--ink-soft); max-width: 62ch; }
.page-head { padding: clamp(2rem, 1rem + 3vw, 3.5rem) 0 1.25rem; }
.page-head h1 { margin: 0 0 0.6rem; }
.page-head .lead { margin: 0; }
.page-meta { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; margin: 1rem 0 0; color: var(--ink-soft); font-size: 0.95rem; }
.page-meta a { font-weight: 600; }
.section { margin-top: clamp(4rem, 3rem + 4vw, 7rem); }
.section-head { max-width: 46rem; margin-bottom: 2rem; }
.section-head h2 { margin: 0 0 0.5rem; }
.section-head p { margin: 0; color: var(--ink-soft); font-size: var(--step-1); }

.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
}
.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 1.35rem 1.4rem;
  min-width: 0;
}
.card > :first-child { margin-top: 0; }
.card > :last-child { margin-bottom: 0; }
.card h2, .card h3 { margin-top: 0; font-size: var(--step-1); }

/* ================================================================ buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0.6rem 1.15rem;
  border-radius: var(--r);
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--ink);
  font: inherit;
  font-weight: 650;
  font-size: 0.98rem;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}
.button:hover { background: var(--bg-soft); color: var(--ink); text-decoration: none; }
.button:active { transform: translateY(1px); }
.button[disabled], .button[aria-disabled="true"] { opacity: 0.6; cursor: progress; }
.button-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.button-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--accent-ink); }
.button-big { min-height: 3.25rem; padding: 0.8rem 1.4rem; font-size: 1.05rem; }
.button svg { width: 1.1em; height: 1.1em; flex: none; }
.button-row { display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center; }
@media (max-width: 30rem) { .button-row .button-big { width: 100%; } }

/* ======================================================= notes & warnings */
.note, .warning {
  border-radius: var(--r);
  padding: 0.9rem 1.1rem;
  margin: 1.25rem 0;
  border: 1px solid;
  border-left-width: 4px;
  max-width: var(--measure);
}
.note { background: var(--note-bg); border-color: var(--note-line); }
.warning { background: var(--warn-bg); border-color: var(--warn-line); }
.note > :last-child, .warning > :last-child { margin-bottom: 0; }

/* ================================================================= steps */
.steps { list-style: none; counter-reset: step; padding: 0; margin: 1.5rem 0; max-width: var(--measure); }
.steps.steps-wide { max-width: 64rem; }
.steps > li { counter-increment: step; position: relative; padding: 0 0 1.75rem 3.1rem; margin: 0; }
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: -0.05rem;
  width: 2rem; height: 2rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-code);
  font-weight: 700;
  font-size: 0.95rem;
  background: var(--accent);
  color: var(--accent-ink);
}
.steps > li::after { content: ""; position: absolute; left: 0.95rem; top: 2.3rem; bottom: 0.4rem; border-left: 2px solid var(--line); }
.steps > li:last-child { padding-bottom: 0; }
.steps > li:last-child::after { display: none; }
.steps > li > :first-child { margin-top: 0; }
.steps > li > :last-child { margin-bottom: 0; }
.steps h3, .steps h4 { margin: 0.1rem 0 0.4rem; font-size: var(--step-1); }

/* =================================================================== toc */
.toc { border: 1px solid var(--line); border-radius: var(--r-lg); padding: 1rem 1.25rem; margin: 1.5rem 0; background: var(--bg-soft); }
.toc h2 { font-size: 1rem; font-family: var(--font-sans); margin: 0 0 0.5rem; letter-spacing: 0; }
.toc ol, .toc ul { margin: 0; padding-left: 1.2rem; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }

/* ============================================================ TB code */
pre.tb-code {
  position: relative;
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--r);
  padding: 1rem 1.15rem;
  margin: 1.25rem 0;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.6;
  tab-size: 2;
  max-width: 100%;
}
pre.tb-code code { font-size: inherit; background: none; border: 0; padding: 0; color: inherit; }
pre.tb-code[data-runnable], pre.tb-code[data-example] { margin-bottom: 0; border-bottom-left-radius: 0; border-bottom-right-radius: 0; }
.tok-com { color: var(--code-com); font-style: italic; }
.tok-str { color: var(--code-str); }
.tok-key { color: var(--code-key); font-weight: 600; }
.tok-num { color: var(--code-num); }
.tok-fn  { color: var(--code-fn); }
.tok-op  { color: var(--code-muted); }

/* runner bar + output under a runnable block */
.runner { margin: 0 0 1.5rem; }
.runner-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  background: var(--code-bar);
  border-top: 1px solid var(--code-line);
  border-radius: 0 0 var(--r) var(--r);
  padding: 0.5rem 0.65rem;
}
.runner-bar .button { min-height: 2.25rem; padding: 0.35rem 0.85rem; font-size: 0.9rem; }
.button-run { background: var(--marigold); border-color: var(--marigold); color: #1d1620; }
.button-run:hover { background: #f7bd61; border-color: #f7bd61; color: #1d1620; }
.runner-bar .button-ghost { background: transparent; border-color: #57475d; color: var(--code-ink); }
.runner-bar .button-ghost:hover { background: rgb(255 255 255 / 0.08); color: var(--code-ink); }
.runner-status { color: var(--code-muted); font-size: 0.85rem; }
.runner.has-output .runner-bar { border-radius: 0; }
.runner .output {
  margin: 0;
  border-radius: 0 0 var(--r) var(--r);
  background: var(--code-out);
  color: var(--code-ink);
  border: 0;
  border-top: 1px solid var(--code-line);
}
.runner .output .out-error { color: var(--code-err); }
.runner .output .out-ask, .runner .output .out-done { color: var(--code-muted); }
.runner .output .out-answer { color: var(--code-str); }

/* program output */
.output {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 0.9rem 1.15rem;
  margin: 1rem 0;
  font-family: var(--font-code);
  font-size: 0.875rem;
  line-height: 1.6;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--ink);
  min-height: 2.5rem;
}
.output:empty::before { content: attr(data-empty); color: var(--ink-faint); font-family: var(--font-sans); }
.output .out-error { display: block; color: var(--error); font-weight: 600; white-space: pre-wrap; }
.output .out-ask { color: var(--ink-soft); }
.output .out-answer { color: var(--accent-text); font-weight: 600; }
.output .out-done { display: block; margin-top: 0.3rem; color: var(--ink-faint); font-family: var(--font-sans); font-size: 0.85rem; }

/* shell commands (not TB code) */
pre.cmd {
  background: var(--bg-sunk);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 0.65rem 0.9rem;
  margin: 0.75rem 0 1rem;
  overflow-x: auto;
  font-size: 0.875rem;
  max-width: 100%;
}
pre.cmd code { background: none; border: 0; padding: 0; font-size: inherit; }
pre.cmd code::before { content: "> "; color: var(--ink-faint); user-select: none; }

/* ======================================================== editor window */
.window {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-window);
  overflow: hidden;
  min-width: 0;
}
.window-bar {
  display: flex;
  align-items: stretch;
  gap: 0;
  background: var(--code-bar);
  border-bottom: 1px solid var(--code-line);
  min-height: 2.6rem;
  overflow-x: auto;
  scrollbar-width: none;
}
.window-dots { display: flex; gap: 0.4rem; align-items: center; padding: 0 0.9rem; flex: none; }
.window-dots i { display: block; width: 0.7rem; height: 0.7rem; border-radius: 50%; background: #4b3d51; }
.window-tabs { display: flex; align-items: stretch; }
.window-tab {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--code-muted);
  font-family: var(--font-code);
  font-size: 0.8rem;
  padding: 0 0.95rem;
  cursor: pointer;
  border-right: 1px solid var(--code-line);
  white-space: nowrap;
}
.window-tab:hover { color: var(--code-ink); }
.window-tab[aria-selected="true"] { background: var(--code-bg); color: var(--code-ink); box-shadow: inset 0 2px 0 var(--marigold); }
.window-tab:focus-visible { outline-offset: -3px; }
.window pre.tb-code { margin: 0; border-radius: 0; background: transparent; padding: 1.1rem 1.25rem; font-size: 0.9rem; }
.window-panel[hidden] { display: none; }
.window-out {
  border-top: 1px solid var(--code-line);
  background: var(--code-out);
}
.window-out-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.45rem 0.6rem 0.45rem 1.25rem;
  font-family: var(--font-code);
  font-size: 0.75rem;
  color: var(--code-muted);
  border-bottom: 1px solid var(--code-line);
}
.window-out-head .button { min-height: 2.1rem; padding: 0.3rem 0.85rem; font-size: 0.85rem; font-family: var(--font-sans); }
.window-out pre {
  margin: 0;
  padding: 0.9rem 1.25rem 1.1rem;
  font-size: 0.85rem;
  line-height: 1.6;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  color: var(--code-ink);
  min-height: 5.5rem;
}
.window-out .out-error { color: var(--code-err); }
.window-out .prompt { color: var(--code-muted); user-select: none; }

/* ================================================================== home */
.hero {
  display: grid;
  gap: 2.5rem 3.5rem;
  align-items: center;
  padding: clamp(2.5rem, 1rem + 6vw, 6rem) 0 clamp(2rem, 1rem + 3vw, 3rem);
}
@media (min-width: 64rem) { .hero { grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); } }
.hero > * { min-width: 0; }
.hero-title {
  font-family: var(--font-display);
  font-size: var(--step-hero);
  font-weight: 850;
  line-height: 0.85;
  letter-spacing: -0.06em;
  margin: 0 0 1.5rem;
  color: var(--ink);
  display: inline-flex;
  align-items: flex-end;
}
.hero-title .cursor {
  display: inline-block;
  width: 0.14em;
  height: 0.12em;
  margin-left: 0.06em;
  margin-bottom: 0.05em;
  background: var(--marigold);
  border-radius: 2px;
}
.js .hero-title .cursor { animation: blink 1.15s steps(1) 6; }
@keyframes blink { 50% { opacity: 0; } }
.hero-tagline {
  font-family: var(--font-display);
  font-size: var(--step-3);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
  max-width: 20ch;
}
.hero-sub { font-size: var(--step-1); color: var(--ink-soft); max-width: 40ch; margin: 0 0 2rem; }
.hero-meta { margin: 1.25rem 0 0; font-size: 0.9rem; color: var(--ink-faint); }
.hero-meta a { color: var(--ink-soft); }

/* feature grid: one ruled block, not floating cards */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 19rem), 1fr));
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--line);
  gap: 1px;
}
.feature { background: var(--bg); padding: 1.6rem 1.5rem 1.5rem; display: flex; flex-direction: column; min-width: 0; }
.feature h3 { font-size: var(--step-1); margin: 0 0 0.4rem; letter-spacing: -0.01em; }
.feature p { color: var(--ink-soft); margin: 0 0 1.1rem; }
.feature .specimen { margin-top: auto; }
.specimen {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--r);
  font-family: var(--font-code);
  font-size: 0.8rem;
  line-height: 1.55;
  overflow: hidden;
}
.specimen pre { margin: 0; padding: 0.8rem 0.95rem; white-space: pre; overflow-x: auto; background: transparent; }
.specimen pre.tb-code { border-radius: 0; font-size: 0.8rem; padding: 0.8rem 0.95rem; }
.specimen .specimen-out { border-top: 1px solid var(--code-line); background: var(--code-out); white-space: pre-wrap; overflow-wrap: anywhere; }
.specimen .out-error { color: var(--code-err); }
.platforms { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.5rem; margin-top: auto; }
.platforms li { margin: 0; padding: 0.55rem 0.7rem; border: 1px solid var(--line); border-radius: var(--r-sm); font-size: 0.9rem; font-weight: 600; display: flex; flex-direction: column; }
.platforms small { font-weight: 400; color: var(--ink-faint); font-family: var(--font-code); font-size: 0.75rem; }

/* tour */
.tour { display: grid; gap: 1.5rem; grid-template-columns: minmax(0, 1fr); }
.tour > * { min-width: 0; }
@media (min-width: 56rem) { .tour { grid-template-columns: 16rem minmax(0, 1fr); align-items: start; } }
.tour-tabs { display: flex; flex-direction: column; gap: 0.25rem; }
@media (max-width: 55.99rem) {
  .tour-tabs { flex-direction: row; overflow-x: auto; padding-bottom: 0.25rem; scrollbar-width: thin; }
}
.tour-tab {
  appearance: none;
  text-align: left;
  font: inherit;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink-soft);
  padding: 0.7rem 0.9rem;
  border-radius: var(--r);
  cursor: pointer;
  flex: none;
}
.tour-tab strong { display: block; color: var(--ink); font-weight: 650; }
.tour-tab span { display: block; font-size: 0.875rem; }
@media (max-width: 55.99rem) { .tour-tab span { display: none; } }
.tour-tab:hover { background: var(--bg-soft); }
.tour-tab[aria-selected="true"] { background: var(--bg-soft); border-color: var(--line); box-shadow: inset 3px 0 0 var(--accent); }
.tour-panel[hidden] { display: none; }
.tour-panel > p { color: var(--ink-soft); margin: 0 0 0.75rem; max-width: 60ch; }
.tour-panel pre.tb-code { margin-top: 0; }

/* install strip */
.install { display: grid; gap: 2rem 3rem; align-items: start; }
@media (min-width: 56rem) { .install { grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); } }
.install > * { min-width: 0; }
.terminal { background: var(--code-bg); color: var(--code-ink); border-radius: var(--r-lg); overflow: hidden; box-shadow: var(--shadow-window); }
.terminal pre { margin: 0; padding: 1.1rem 1.25rem; font-size: 0.875rem; line-height: 1.7; white-space: pre-wrap; overflow-wrap: anywhere; }
.terminal .p { color: var(--marigold); user-select: none; }
.terminal .c { color: var(--code-com); }

/* why TB / letter */
.why { display: grid; gap: 2rem 4rem; }
@media (min-width: 56rem) { .why { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); } }
.why > * { min-width: 0; }
.letter {
  border-left: 3px solid var(--accent);
  padding: 0.25rem 0 0.25rem clamp(1.25rem, 0.8rem + 1.5vw, 2rem);
  max-width: 40rem;
}
.letter p {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  font-size: 1.15rem;
  line-height: 1.75;
}
.letter .salutation { font-style: italic; }
.letter .signature { font-style: italic; font-size: 1.3rem; margin: 1.25rem 0 0; color: var(--accent-text); }

/* closing call to action */
.cta-band {
  margin-top: clamp(4rem, 3rem + 4vw, 7rem);
  padding: clamp(2rem, 1.5rem + 3vw, 3.5rem);
  border-radius: var(--r-lg);
  background: var(--code-bg);
  color: var(--code-ink);
  display: grid;
  gap: 1.25rem 2rem;
  align-items: center;
}
@media (min-width: 48rem) { .cta-band { grid-template-columns: 1fr auto; } }
.cta-band h2 { margin: 0 0 0.35rem; color: #fff; }
.cta-band p { margin: 0; color: var(--code-muted); }
.cta-band .button:not(.button-primary) { background: transparent; color: var(--code-ink); border-color: #57475d; }
.cta-band .button:not(.button-primary):hover { background: rgb(255 255 255 / 0.08); }
.cta-band .button-primary { background: #ff6f8e; border-color: #ff6f8e; color: #1d1620; }
.cta-band .button-primary:hover { background: #ff8ca5; border-color: #ff8ca5; }

/* ================================================================== docs */
.docs {
  display: grid;
  gap: 0 2.5rem;
  padding-top: 1.5rem;
}
@media (min-width: 60rem) { .docs { grid-template-columns: 15rem minmax(0, 1fr); } }
@media (min-width: 80rem) { .docs { grid-template-columns: 15rem minmax(0, 1fr) 12rem; } }
.docs > * { min-width: 0; }
.docs-sidebar { font-size: 0.93rem; }
@media (min-width: 60rem) {
  .docs-sidebar-inner { position: sticky; top: calc(var(--header-h) + 1.25rem); max-height: calc(100vh - var(--header-h) - 2.5rem); overflow-y: auto; padding: 0.5rem 0.25rem 2rem 0; }
  .docs-nav-toggle { display: none; }
}
@media (max-width: 59.99rem) {
  .docs-sidebar { border: 1px solid var(--line); border-radius: var(--r); margin-bottom: 1.5rem; background: var(--bg-soft); }
  .docs-nav-toggle {
    appearance: none; width: 100%; display: flex; justify-content: space-between; align-items: center;
    font: inherit; font-weight: 650; color: var(--ink); background: transparent; border: 0;
    padding: 0.8rem 1rem; cursor: pointer; min-height: 2.75rem;
  }
  .docs-nav-toggle svg { width: 1rem; height: 1rem; transition: transform 0.15s; }
  .docs-nav-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }
  .js .docs-sidebar-inner { display: none; }
  .js .docs-sidebar.open .docs-sidebar-inner { display: block; }
  .docs-sidebar-inner { padding: 0 1rem 1rem; }
  .no-js-hide { display: none; }
}
.docs-sidebar h2 {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0;
  margin: 1.25rem 0 0.35rem;
}
.docs-sidebar h2:first-child { margin-top: 0.25rem; }
.docs-sidebar ul { list-style: none; padding: 0; margin: 0; }
.docs-sidebar li { margin: 0; }
.docs-sidebar a {
  display: block;
  padding: 0.3rem 0.65rem;
  color: var(--ink-soft);
  text-decoration: none;
  border-left: 2px solid var(--line);
  line-height: 1.4;
}
.docs-sidebar a:hover { color: var(--ink); border-left-color: var(--line-strong); }
.docs-sidebar a.is-active { color: var(--accent-text); border-left-color: var(--accent); font-weight: 600; }
.docs-main { max-width: 46rem; }
.docs-main > section { scroll-margin-top: calc(var(--header-h) + 1rem); }
.docs-main > section > h2 { padding-top: 0.5rem; }
.docs-main h1 { margin-top: 0.5rem; }
.chapter-num { font-family: var(--font-code); color: var(--accent-text); font-weight: 600; margin-right: 0.35em; font-size: 0.8em; }
.on-this-page { display: none; font-size: 0.875rem; }
@media (min-width: 80rem) {
  .on-this-page { display: block; }
  .on-this-page-inner { position: sticky; top: calc(var(--header-h) + 1.25rem); }
}
.on-this-page h2 { font-family: var(--font-sans); font-size: 0.8rem; letter-spacing: 0; margin: 0.25rem 0 0.5rem; }
.on-this-page ul { list-style: none; padding: 0; margin: 0; }
.on-this-page li { margin: 0; }
.on-this-page a { display: block; padding: 0.2rem 0; color: var(--ink-soft); text-decoration: none; line-height: 1.4; }
.on-this-page a:hover { color: var(--ink); }
.on-this-page a.is-active { color: var(--accent-text); font-weight: 600; }
.on-this-page .sub a { padding-left: 0.75rem; }

/* reference signature cards */
.sig-list { display: grid; gap: 1rem; margin: 1.5rem 0; }
.sig {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}
.sig-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.25rem 1rem;
  padding: 0.8rem 1.1rem;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
}
.sig-head h3 { margin: 0; font-family: var(--font-code); font-size: 1rem; font-weight: 700; letter-spacing: 0; }
.sig-head h3 .sig-name { color: var(--accent-text); }
.sig-head h3 .sig-args { color: var(--ink-soft); font-weight: 500; }
.sig-returns { font-family: var(--font-code); font-size: 0.8rem; color: var(--ink-faint); }
.sig-body { padding: 0.9rem 1.1rem 1.1rem; }
.sig-body > :last-child { margin-bottom: 0; }
.sig-body p { margin-bottom: 0.75rem; }
.sig-body pre.tb-code { margin-top: 0.5rem; }
.sig-body .runner { margin-bottom: 0; }
.kw-table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.kw-table th, .kw-table td { text-align: left; padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.kw-table th { font-size: 0.85rem; color: var(--ink-soft); font-weight: 650; }
.kw-table td:first-child { white-space: nowrap; }

/* tables */
.table-wrap { overflow-x: auto; max-width: 100%; margin: 1.25rem 0; border: 1px solid var(--line); border-radius: var(--r); }
.table-wrap:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.table-wrap table { margin: 0; }
.table-wrap tr:last-child td { border-bottom: 0; }
.hash-table { width: 100%; border-collapse: collapse; font-size: 0.93rem; }
.hash-table th, .hash-table td { text-align: left; padding: 0.65rem 0.85rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.hash-table th { font-size: 0.85rem; color: var(--ink-soft); font-weight: 650; background: var(--bg-soft); }
.hash-table code { white-space: nowrap; }

/* ============================================================== examples */
.gallery {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr));
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}
.gallery > li { margin: 0; }
.ex-card {
  height: 100%;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--bg);
}
.ex-card:hover { border-color: var(--line-strong); }
.ex-card pre {
  margin: 0;
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 0.85rem 1rem;
  font-size: 0.78rem;
  line-height: 1.55;
  height: 8.6rem;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(#000 60%, transparent);
  mask-image: linear-gradient(#000 60%, transparent);
}
.ex-card-body { padding: 1rem 1.1rem 1.1rem; display: flex; flex-direction: column; gap: 0.5rem; flex: 1; }
.ex-card h3 { margin: 0; font-size: 1.1rem; }
.ex-card h3 a { color: var(--ink); text-decoration: none; }
.ex-card h3 a:hover { color: var(--accent-text); text-decoration: underline; }
.ex-card p { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }
.ex-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; list-style: none; padding: 0; margin: auto 0 0; }
.ex-tags li { margin: 0; font-family: var(--font-code); font-size: 0.72rem; padding: 0.15rem 0.5rem; border-radius: 999px; background: var(--bg-soft); color: var(--ink-soft); border: 1px solid var(--line); }
.ex-tags li.tag-ask { background: var(--accent-soft); color: var(--accent-text); border-color: transparent; }
.ex-card-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; padding-top: 0.5rem; }
.ex-card-actions .button { min-height: 2.3rem; padding: 0.35rem 0.8rem; font-size: 0.88rem; }

.example { margin-top: 3.5rem; scroll-margin-top: calc(var(--header-h) + 1rem); }
.example-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 0.75rem 1.5rem; margin-bottom: 0.75rem; }
.example-head h2 { margin: 0 0 0.25rem; font-size: var(--step-2); }
.example-head p { margin: 0; color: var(--ink-soft); max-width: 60ch; }
.example-head .button-row .button { min-height: 2.4rem; padding: 0.4rem 0.9rem; font-size: 0.9rem; }
.example pre.tb-code { max-height: 34rem; overflow: auto; }

/* ============================================================== download */
.release {
  display: grid;
  gap: 1.5rem 2.5rem;
  padding: clamp(1.25rem, 1rem + 1.5vw, 2rem);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--bg-soft);
  margin: 0.5rem 0 1rem;
  align-items: center;
}
@media (min-width: 56rem) { .release { grid-template-columns: minmax(0, 1fr) auto; } }
.release h2 { margin: 0 0 0.35rem; font-size: var(--step-2); }
.release p { margin: 0; }
.dl-meta { color: var(--ink-soft); font-size: 0.95rem; }
.release .button-big { white-space: normal; text-align: left; }
.release .button code { background: none; border: 0; color: inherit; padding: 0; font-size: 0.92em; }
.dl-hero { display: grid; gap: 1rem; }

.os-tabs { display: flex; flex-wrap: wrap; gap: 0.35rem; margin: 1rem 0 0; border-bottom: 1px solid var(--line); }
.os-tabs [role="tab"] {
  appearance: none;
  font: inherit;
  font-weight: 650;
  padding: 0.6rem 1rem;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
}
.os-tabs [role="tab"]:hover { color: var(--ink); }
.os-tabs [role="tab"][aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); }
.os-panel { padding-top: 1.25rem; }
.os-panel[hidden] { display: none; }

.step-card { display: grid; gap: 1rem 1.75rem; align-items: start; }
@media (min-width: 52rem) { .step-card { grid-template-columns: minmax(0, 1fr) minmax(0, 22rem); } }
.step-card > * { min-width: 0; }

details.more { border: 1px solid var(--line); border-radius: var(--r); padding: 0.65rem 1rem; margin: 1rem 0; max-width: var(--measure); }
details.more summary { cursor: pointer; font-weight: 650; }
details.more[open] summary { margin-bottom: 0.5rem; }

/* mock dialogs (drawings of what you'll see; always light, like the real OS) */
.mock {
  font-family: "Segoe UI", system-ui, sans-serif;
  font-size: 0.85rem;
  line-height: 1.45;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #c9c2cc;
  box-shadow: 0 8px 24px -12px rgb(0 0 0 / 0.35);
  background: #ffffff;
  color: #1b1b1b;
  user-select: none;
}
.mock-title { display: flex; align-items: center; gap: 0.4rem; padding: 0.45rem 0.7rem; background: #f1eef2; border-bottom: 1px solid #ddd6df; font-size: 0.78rem; color: #444; }
.mock-dots { display: inline-flex; gap: 0.3rem; }
.mock-dots i { width: 0.6rem; height: 0.6rem; border-radius: 50%; background: #d3cbd6; display: block; }
.mock-dots i:nth-child(1) { background: #ec6a5e; }
.mock-dots i:nth-child(2) { background: #f4bf4f; }
.mock-dots i:nth-child(3) { background: #61c554; }
.mock-body { padding: 0.9rem 1rem 1rem; }
.mock-body p { margin: 0 0 0.55rem; }
.mock-body .mock-head { font-size: 1.05rem; font-weight: 600; margin-bottom: 0.45rem; }
.mock-smartscreen { background: #0a5aa8; color: #fff; border-color: #0a4c8f; }
.mock-smartscreen .mock-body { padding: 1.1rem 1.1rem 0.9rem; }
.mock-smartscreen .mock-head { font-size: 1.3rem; font-weight: 300; }
.mock-smartscreen .mock-link { color: #fff; text-decoration: underline; }
.mock-buttons { display: flex; gap: 0.45rem; justify-content: flex-end; flex-wrap: wrap; margin-top: 0.75rem; }
.mock-btn { display: inline-block; padding: 0.3rem 0.9rem; border: 1px solid #8f8f8f; background: #f4f4f4; color: #1b1b1b; border-radius: 4px; font-size: 0.8rem; }
.mock-smartscreen .mock-btn { background: transparent; color: #fff; border-color: #fff; }
.mock-btn.is-target, .mock-link.is-target, .mock-menu .is-target { outline: 3px solid #ffb02e; outline-offset: 2px; border-radius: 4px; }
.mock-mac .mock-btn.default { background: #2f7bf6; color: #fff; border-color: #2f7bf6; }
.mock-bar { display: flex; align-items: center; gap: 0.6rem; padding: 0.6rem 0.75rem; background: #fbfbfb; }
.mock-file { width: 1.8rem; height: 2.2rem; border-radius: 3px; background: #e8e2ec; border: 1px solid #c9bfd0; flex: none; display: grid; place-items: center; font-size: 0.6rem; font-weight: 700; color: #6a5570; }
.mock-menu { display: inline-block; margin: 0.5rem 0 0 2.5rem; min-width: 10rem; border: 1px solid #cfcfcf; background: #fff; border-radius: 6px; padding: 0.25rem; box-shadow: 0 6px 16px -8px rgb(0 0 0 / 0.4); }
.mock-menu span { display: block; padding: 0.25rem 0.6rem; border-radius: 4px; }
.mock-terminal { background: #1e1e1e; color: #e6e6e6; font-family: var(--font-code); font-size: 0.78rem; padding: 0.8rem 0.9rem; white-space: pre-wrap; overflow-wrap: anywhere; }
.mock-terminal .p { color: #7fd17f; }
.mock-folder { display: flex; flex-wrap: wrap; gap: 1.2rem; align-items: flex-end; padding: 1.1rem 1rem 1.25rem; background: #fff; position: relative; }
.mock-folder figure { margin: 0; text-align: center; font-size: 0.75rem; width: 6.5rem; overflow-wrap: normal; word-break: keep-all; }
.mock-folder .icon { width: 2.6rem; height: 3rem; margin: 0 auto 0.3rem; border-radius: 4px; display: grid; place-items: center; font-weight: 700; font-size: 0.7rem; }
.mock-folder .icon-exe { background: #b3123e; color: #fff; border-radius: 8px; height: 2.6rem; font-size: 0.95rem; }
.mock-folder .icon-tb { background: #fff; border: 1px solid #b8b0bc; color: #b3123e; }
.mock-folder svg.drag-arrow { position: absolute; left: 3.5rem; top: 0.2rem; width: 6rem; height: 3rem; }
.mock-folder-drag { padding-top: 2.6rem; }
.mock-warn-text { color: #8a5a00; }

/* ============================================================ playground */
.pg-page { padding-top: 1rem; }
.pg-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 0.5rem 2rem; margin-bottom: 1rem; }
.pg-head h1 { font-size: var(--step-3); margin: 0; }
.pg-head p { margin: 0; color: var(--ink-soft); }
.ide {
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--code-bg);
  color: var(--code-ink);
  box-shadow: var(--shadow-window);
  display: flex;
  flex-direction: column;
}
.ide-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.6rem;
  padding: 0.55rem 0.65rem;
  background: var(--code-bar);
  border-bottom: 1px solid var(--code-line);
}
.ide-bar label { font-size: 0.85rem; color: var(--code-muted); padding-left: 0.3rem; }
.ide-bar select {
  font: inherit;
  font-family: var(--font-code);
  font-size: 0.85rem;
  padding: 0.4rem 2rem 0.4rem 0.7rem;
  border-radius: var(--r-sm);
  border: 1px solid #57475d;
  background: var(--code-bg);
  color: var(--code-ink);
  min-height: 2.4rem;
  max-width: 100%;
}
.ide-bar .button { min-height: 2.4rem; padding: 0.4rem 0.9rem; font-size: 0.9rem; }
.ide-bar .button-ghost { background: transparent; border-color: #57475d; color: var(--code-ink); }
.ide-bar .button-ghost:hover { background: rgb(255 255 255 / 0.08); color: var(--code-ink); }
.ide-bar .spacer { flex: 1; }
.ide-hint { font-size: 0.8rem; color: var(--code-muted); }
.ide-hint kbd { background: transparent; color: var(--code-ink); border-color: #57475d; }
.ide-body { display: grid; min-height: 0; }
@media (min-width: 64rem) {
  .ide-body { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); height: calc(100vh - var(--header-h) - 12rem); min-height: 30rem; }
}
.ide-body > * { min-width: 0; min-height: 0; }
.editor { display: flex; position: relative; min-height: 22rem; height: 100%; overflow: hidden; }
.editor:focus-within { box-shadow: inset 0 0 0 2px var(--focus); }
.editor-gutter {
  flex: none;
  padding: 1rem 0.6rem 1rem 0.9rem;
  text-align: right;
  color: var(--code-muted);
  font-family: var(--font-code);
  font-size: 0.875rem;
  line-height: 1.6;
  user-select: none;
  overflow: hidden;
  border-right: 1px solid var(--code-line);
  min-width: 3rem;
}
.editor-gutter span { display: block; }
.editor-gutter span.is-error { color: #fff; background: #c02a55; border-radius: 4px; margin-right: -0.3rem; padding-right: 0.3rem; }
.editor-area { position: relative; flex: 1; min-width: 0; }
.editor-area textarea, .editor-area .editor-highlight {
  position: absolute;
  inset: 0;
  margin: 0;
  border: 0;
  padding: 1rem;
  font-family: var(--font-code);
  font-size: 0.875rem;
  line-height: 1.6;
  tab-size: 2;
  white-space: pre;
  overflow: auto;
  letter-spacing: 0;
  word-spacing: 0;
}
.editor-area .editor-highlight { color: var(--code-ink); pointer-events: none; overflow: hidden; background: transparent; }
.editor-area textarea {
  resize: none;
  outline: none;
  background: transparent;
  color: transparent;
  caret-color: var(--marigold);
  -webkit-text-fill-color: transparent;
}
.editor-area.no-highlight textarea { color: var(--code-ink); -webkit-text-fill-color: var(--code-ink); }
.editor-area.no-highlight .editor-highlight { display: none; }
.editor-area textarea::selection { background: rgb(255 122 155 / 0.35); -webkit-text-fill-color: transparent; }
.console { display: flex; flex-direction: column; background: var(--code-out); border-top: 1px solid var(--code-line); min-height: 16rem; }
@media (min-width: 64rem) { .console { border-top: 0; border-left: 1px solid var(--code-line); } }
.console-head { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; padding: 0.4rem 0.6rem 0.4rem 1rem; border-bottom: 1px solid var(--code-line); }
.console-head h2 { margin: 0; font-family: var(--font-code); font-size: 0.8rem; font-weight: 600; color: var(--code-muted); letter-spacing: 0; }
.console-head .button { min-height: 2.1rem; padding: 0.25rem 0.75rem; font-size: 0.85rem; background: transparent; border-color: #57475d; color: var(--code-ink); }
.console-head .button:hover { background: rgb(255 255 255 / 0.08); color: var(--code-ink); }
.console .output {
  flex: 1;
  margin: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--code-ink);
  overflow: auto;
  min-height: 12rem;
  padding: 1rem;
}
.console .output:empty::before { color: var(--code-muted); }
.console .output .out-error { color: var(--code-err); }
.console .output .out-ask, .console .output .out-done { color: var(--code-muted); }
.console .output .out-answer { color: var(--code-str); }
.console-status { display: flex; align-items: center; gap: 0.6rem; padding: 0.5rem 1rem; color: var(--code-muted); font-size: 0.85rem; border-top: 1px solid var(--code-line); min-height: 2.4rem; }
.console-status:empty { display: none; }
.spinner { width: 0.95rem; height: 0.95rem; border-radius: 50%; border: 2px solid #57475d; border-top-color: var(--marigold); animation: spin 0.8s linear infinite; flex: none; }
@keyframes spin { to { transform: rotate(360deg); } }
.pg-about { color: var(--ink-soft); margin: 1rem 0 0; min-height: 1.6em; max-width: 70ch; }
.pg-edited { margin: 0.5rem 0 0; padding: 0.45rem 0.85rem; font-size: 0.93rem; }
.pg-help { color: var(--ink-faint); font-size: 0.875rem; margin: 0.5rem 0 0; }
.share-out { display: flex; gap: 0.5rem; align-items: center; margin-top: 0.75rem; max-width: 46rem; }
.share-out[hidden] { display: none; }
.share-out input { flex: 1; min-width: 0; font: inherit; font-family: var(--font-code); font-size: 0.85rem; padding: 0.5rem 0.7rem; border-radius: var(--r-sm); border: 1px solid var(--line-strong); background: var(--bg); color: var(--ink); }

/* ======================================================== reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition: none !important; }
  .js .hero-title .cursor { animation: none; }
}

@media print {
  .site-header, .site-footer, .runner-bar, .theme-toggle, .docs-sidebar, .on-this-page { display: none; }
  pre.tb-code, .window, .specimen { background: #fff !important; color: #000 !important; border: 1px solid #ccc; }
}

.docs-sidebar code { background: none; border: 0; padding: 0; font-size: 0.9em; }

/* ======================================================= 2.0 additions */
.tok-method { color: #8ff0c8; }
.tok-punc { color: var(--code-muted); }
.tok-interp { color: var(--code-key); }
.flush { margin-top: 0; }
.ex-note { font-size: 0.875rem; color: var(--ink-faint); margin: 0 0 0.4rem; }

/* hero output: text or a screenshot */
.hero-out { min-height: 5.5rem; }
.hero-out pre { margin: 0; padding: 0.9rem 1.25rem 1.1rem; font-size: 0.85rem; line-height: 1.6; white-space: pre-wrap; overflow-wrap: anywhere; color: var(--code-ink); }
.hero-out .out-error { color: var(--code-err); }
.hero-out .prompt { color: var(--code-muted); user-select: none; }
.hero-shot { margin: 0; padding: 1rem 1.25rem 1.1rem; display: grid; gap: 0.6rem; justify-items: center; }
.hero-shot img { display: block; max-height: 17rem; width: auto; border-radius: 8px; box-shadow: 0 10px 30px -12px rgb(0 0 0 / 0.6); }
.hero-shot figcaption { font-size: 0.8rem; color: var(--code-muted); }

/* what you can build */
.builds { display: grid; gap: clamp(2.5rem, 2rem + 2vw, 4rem); }
.build { display: grid; gap: 1.25rem 3rem; align-items: start; }
@media (min-width: 60rem) { .build { grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); } }
.build > * { min-width: 0; }
.build h3 { margin: 0 0 0.5rem; font-size: var(--step-2); }
.build-text p { color: var(--ink-soft); }
.build-apps a { font-weight: 600; }
.build-code pre.tb-code { margin-top: 0; }
.build-shot { margin: 1rem 0 0; }
.build-shot img { display: block; width: 100%; height: auto; border-radius: var(--r-lg); box-shadow: var(--shadow-window); }

/* library cards */
.lib-grid { list-style: none; padding: 0; margin: 1.25rem 0; display: grid; gap: 0.75rem; grid-template-columns: repeat(auto-fill, minmax(min(100%, 15rem), 1fr)); }
.lib-grid li { margin: 0; }
.lib-card { display: flex; flex-direction: column; gap: 0.35rem; height: 100%; padding: 0.9rem 1rem; border: 1px solid var(--line); border-radius: var(--r); text-decoration: none; color: var(--ink); background: var(--bg); }
.lib-card:hover { border-color: var(--accent); color: var(--ink); }
.lib-card-name code { background: none; border: 0; padding: 0; font-size: 1rem; font-weight: 700; color: var(--accent-text); }
.lib-card-doc { font-size: 0.9rem; color: var(--ink-soft); line-height: 1.45; }
.lib-card-meta { margin-top: auto; display: flex; flex-wrap: wrap; gap: 0.35rem 0.75rem; font-size: 0.78rem; color: var(--ink-faint); }
.lib-tag.tag-desktop { color: var(--accent-text); }
.breadcrumb { font-size: 0.9rem; color: var(--ink-faint); margin: 0.5rem 0 0.25rem; }
.breadcrumb a { color: var(--ink-soft); }
.lib-title code { background: none; border: 0; padding: 0; font-size: 1em; color: var(--ink); }

/* apps gallery */
.apps-intro { margin-top: clamp(4rem, 3rem + 4vw, 6rem); }
.apps-group { margin-top: 2.5rem; }
.apps-group-title { font-size: var(--step-2); margin: 0 0 0.25rem; }
.apps-group > p { color: var(--ink-soft); margin: 0 0 1.25rem; }
.app { display: grid; gap: 1rem 2rem; padding: 1.5rem 0; border-top: 1px solid var(--line); scroll-margin-top: calc(var(--header-h) + 1rem); }
@media (min-width: 56rem) { .app { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } .app-source { grid-column: 1 / -1; } }
.app > * { min-width: 0; }
.app h4 { margin: 0 0 0.5rem; font-size: var(--step-1); display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.25rem 0.75rem; }
.app-folder { font-size: 0.8rem; font-weight: 400; color: var(--ink-faint); }
.app-info p { color: var(--ink-soft); }
.app-run, .app-files { font-size: 0.9rem; margin: 0.6rem 0 0; }
.app-files a { margin-right: 0.5rem; font-family: var(--font-code); font-size: 0.85rem; }
.app .ex-tags { margin: 0.75rem 0 0; }
.ex-tags a { color: inherit; text-decoration: none; }
.ex-tags a:hover { text-decoration: underline; }
.ex-tags code { background: none; border: 0; padding: 0; font-size: inherit; }
.app-shot { margin: 0; }
.app-shot img { display: block; max-width: 100%; max-height: 24rem; width: auto; height: auto; border-radius: var(--r); box-shadow: var(--shadow-window); }
.app-sample { background: var(--code-bg); color: var(--code-ink); border-radius: var(--r); overflow: hidden; }
.app-sample figcaption { font-family: var(--font-code); font-size: 0.75rem; color: var(--code-muted); padding: 0.5rem 1rem; border-bottom: 1px solid var(--code-line); }
.app-sample pre { margin: 0; padding: 0.8rem 1rem; font-size: 0.78rem; line-height: 1.55; overflow: auto; max-height: 20rem; }
.app-source summary { cursor: pointer; font-weight: 650; padding: 0.5rem 0; }
.app-source pre.tb-code { max-height: 36rem; overflow: auto; margin-top: 0.5rem; }

/* guides */
.guide-list { list-style: none; padding: 0; margin: 1.25rem 0; display: grid; gap: 0.75rem; }
.guide-list li { margin: 0; }
.guide-card { display: grid; gap: 0.25rem; padding: 1rem 1.15rem; border: 1px solid var(--line); border-radius: var(--r); text-decoration: none; color: var(--ink); }
.guide-card:hover { border-color: var(--accent); color: var(--ink); }
.guide-card strong { font-size: 1.05rem; color: var(--accent-text); }
.guide-card span { color: var(--ink-soft); font-size: 0.95rem; }
.guide-card small { color: var(--ink-faint); }
.guide-shot { margin: 1.25rem 0; }
.guide-shot img { display: block; max-width: 100%; height: auto; border-radius: var(--r); box-shadow: var(--shadow-window); }
.guide-shot figcaption { font-size: 0.875rem; color: var(--ink-faint); margin-top: 0.5rem; }
@media (min-width: 48rem) { .features.features-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.window pre.tb-code { font-size: 0.84rem; }
.mock-more { margin-left: auto; }
.mock-menu-wrap { padding: 0 0.75rem 0.75rem; text-align: right; }
.mock-menu-wrap .mock-menu { text-align: left; }
.mock-tight { margin: 0; }
.mock-check { display: inline-grid; place-items: center; width: 1rem; height: 1rem; border: 1px solid #2f7bf6; background: #2f7bf6; color: #fff; font-size: 0.7rem; border-radius: 3px; margin-right: 0.35rem; }