:root {
  --bubblegum: #ff4fa3;
  --grape: #8b5cf6;
  --mint: #4fe3c1;
  --butter: #ffc94a;
  --tangerine: #ff8a2a;
  --night: #1d0b3a;

  --bg: #fff3f9;
  --surface: #ffe3f1;
  --ink: var(--night);
  --muted: #5b4780;
  --line: #f3c6de;
  --link: #6d3ce0;
  --code-bg: var(--night);
  --code-ink: #efe6ff;
  --code-kw: #ff8ccb;
  --code-type: #ffc94a;
  --code-str: #9ff5dc;
  --code-dim: #8f7bb8;
  --code-error: #ff8ccb;
  --out-bg: #2a1352;
  --out-line: #3d2170;
  --note: var(--mint);
  --tip: var(--butter);
  --shadow: var(--night);

  --display: "Unbounded", system-ui, sans-serif;
  --body: "Bricolage Grotesque", system-ui, sans-serif;
  --mono: "Martian Mono", ui-monospace, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14072b;
    --surface: #22104a;
    --ink: #fbf1ff;
    --muted: #c3b2e6;
    --line: #36205f;
    --link: #ffc94a;
    --code-bg: #0c0320;
    --out-bg: #1b0b3a;
    --out-line: #2c1556;
    --shadow: var(--grape);
  }
}

:root[data-theme="dark"] {
  --bg: #14072b;
  --surface: #22104a;
  --ink: #fbf1ff;
  --muted: #c3b2e6;
  --line: #36205f;
  --link: #ffc94a;
  --code-bg: #0c0320;
  --out-bg: #1b0b3a;
  --out-line: #2c1556;
  --shadow: var(--grape);
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-padding-top: 7rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.7;
}

a { color: var(--link); text-underline-offset: 0.2em; text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--bubblegum);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ── bar ─────────────────────────────────────────────── */

.bar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  border-bottom: 3px solid var(--ink);
}
.bar-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  max-width: 84rem;
  margin: 0 auto;
  padding: 0.7rem 1rem;
}
@media (min-width: 48rem) { .bar-inner { padding: 0.7rem 2rem; } }

.wordmark {
  color: var(--ink);
  text-decoration: none;
  font-family: var(--display);
  font-weight: 900;
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: -0.05em;
  text-shadow: 0.05em 0.05em 0 var(--bubblegum);
}
.bar .links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-left: auto;
  font-size: 0.9375rem;
  font-weight: 600;
}
.bar .links a { color: var(--ink); text-decoration: none; }
.bar .links a:hover, .bar .links a[aria-current="page"] { text-decoration: underline; }
.bar .links a.polar-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: #0d3557;
  color: #f2f6f9;
  font-size: 0.8125rem;
  white-space: nowrap;
}
.bar .links a.polar-badge:hover { background: #2c6e96; text-decoration: none; }
@media (max-width: 36rem) {
  .bar-inner { gap: 0.9rem; }
  .bar .links { gap: 1rem; }
  .bar .links a:first-child, .bar .links a.polar-badge { display: none; }
}

.construction {
  margin: 0;
  padding: 0.4rem 1rem;
  background: var(--butter);
  color: var(--night);
  border-top: 3px solid var(--night);
  font-size: 0.875rem;
  font-weight: 600;
  text-align: center;
}
.construction a { color: var(--night); }
.construction .dot {
  display: inline-block;
  width: 0.65em;
  height: 0.65em;
  margin-right: 0.45rem;
  border: 2px solid var(--night);
  border-radius: 50%;
  background: var(--tangerine);
  vertical-align: -0.02em;
}

.menu {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.9rem;
  border: 2px solid var(--ink);
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
}
@media (min-width: 64rem) { .menu { display: none; } }

/* ── layout ──────────────────────────────────────────── */

.layout {
  max-width: 84rem;
  margin: 0 auto;
  padding: 0 1rem;
}
@media (min-width: 48rem) { .layout { padding: 0 2rem; } }
@media (min-width: 64rem) {
  .layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 16rem;
    gap: 4rem;
  }
}

.sidebar {
  display: none;
  font-size: 0.9375rem;
  line-height: 1.45;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.sidebar.open {
  display: block;
  position: fixed;
  inset: 6.2rem 0 0 0;
  z-index: 15;
  overflow-y: auto;
  padding: 1.5rem 1rem 3rem;
  background: var(--bg);
}
@media (min-width: 64rem) {
  .sidebar, .sidebar.open {
    display: block;
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    inset: auto;
    top: 6.5rem;
    align-self: start;
    max-height: calc(100vh - 6.5rem);
    overflow-y: auto;
    padding: 2.5rem 0 3rem;
    background: none;
  }
}
.sidebar h2 {
  margin: 1.75rem 0 0.6rem;
  font-family: var(--display);
  font-size: 0.875rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.sidebar h2:first-child { margin-top: 0; }
.sidebar ol { list-style: none; margin: 0; padding: 0; }
.sidebar a {
  display: block;
  margin: 0.1rem 0;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
}
.sidebar a:hover { color: var(--ink); background: var(--surface); }
.sidebar a[aria-current="page"] {
  color: var(--night);
  background: var(--butter);
  font-weight: 700;
}

main { min-width: 0; padding-bottom: 5rem; }
@media (min-width: 64rem) { main { grid-column: 1; grid-row: 1; } }

/* ── article ─────────────────────────────────────────── */

article { max-width: 46rem; padding-top: 2.5rem; }

article h1 {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.1rem, 5vw, 3.1rem);
  line-height: 1.02;
  font-weight: 900;
  letter-spacing: -0.05em;
}
article .lead {
  margin: 1.25rem 0 0;
  font-size: 1.25rem;
  line-height: 1.55;
  font-weight: 500;
  color: var(--ink);
}
article h2 {
  margin: 3rem 0 0;
  font-family: var(--display);
  font-size: clamp(1.35rem, 2.6vw, 1.7rem);
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.035em;
}
article h3 {
  margin: 2.25rem 0 0;
  font-size: 1.25rem;
  line-height: 1.3;
  font-weight: 750;
}
article h2 a.anchor, article h3 a.anchor {
  margin-left: 0.4rem;
  color: var(--bubblegum);
  text-decoration: none;
  opacity: 0;
}
article h2:hover a.anchor, article h3:hover a.anchor, a.anchor:focus { opacity: 1; }
article p { margin: 1rem 0 0; }
article ul, article ol { margin: 1rem 0 0; padding-left: 1.4rem; }
article li { margin: 0.4rem 0; }
article li::marker { color: var(--bubblegum); }
article strong { font-weight: 700; }

pre, code { font-family: var(--mono); }
code { font-size: 0.85em; font-variation-settings: "wdth" 87.5; }

.code {
  margin: 1.4rem 0 0;
  padding: 1.15rem 1.3rem;
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: 18px;
  font-size: 0.8125rem;
  line-height: 1.7;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  tab-size: 2;
}
.code code { font-size: inherit; color: inherit; }
.code .kw { color: var(--code-kw); }
.code .ty { color: var(--code-type); }
.code .st { color: var(--code-str); }
.code .cm, .code .pr { color: var(--code-dim); }
.code .er { color: var(--code-error); font-weight: 600; }

.code:has(+ .out) { border-radius: 18px 18px 0 0; box-shadow: none; }
.code + .out {
  margin-top: 0;
  border-top: 0;
  border-radius: 0 0 18px 18px;
  background: var(--out-bg);
  white-space: pre;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--out-line) transparent;
}

.callout {
  margin: 1.5rem 0 0;
  padding: 0.95rem 1.15rem;
  background: var(--surface);
  border: 2px solid var(--ink);
  border-left: 8px solid var(--note);
  border-radius: 14px;
}
.callout.tip { border-left-color: var(--tip); }
.callout.wip { border-left-color: var(--tangerine); }
.callout p { margin: 0; }
.callout p + p { margin-top: 0.6rem; }
.callout .label { font-weight: 800; }

.table-wrap { margin: 1.25rem 0 0; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.9375rem; line-height: 1.5; }
th, td {
  text-align: left;
  vertical-align: top;
  padding: 0.6rem 1rem 0.6rem 0;
  border-bottom: 2px dashed var(--line);
}
th { font-weight: 750; border-bottom: 3px solid var(--ink); }

.edit {
  max-width: 46rem;
  margin-top: 3rem;
  font-size: 0.9375rem;
}

.pager {
  display: grid;
  gap: 1rem;
  max-width: 46rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 3px solid var(--ink);
}
@media (min-width: 40rem) { .pager { grid-template-columns: 1fr 1fr; } }
.pager a {
  display: block;
  padding: 0.9rem 1.2rem;
  border: 3px solid var(--ink);
  border-radius: 18px;
  color: var(--ink);
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.pager a:hover { transform: translate(-2px, -2px); box-shadow: 5px 5px 0 var(--bubblegum); }
.pager .dir { display: block; font-size: 0.8125rem; color: var(--muted); }
.pager .title { display: block; font-family: var(--display); font-weight: 800; font-size: 1rem; letter-spacing: -0.03em; }
.pager .next { text-align: right; grid-column: 2; }
@media (max-width: 39.99rem) { .pager .next { grid-column: auto; } }