/* goldnode — shared theme for nicks.net, tensref.org, tenskit.org, packages.goldnode.org
   Token names follow tensref.org so this can be dropped back into it. */

/* ---------- Light (default) ---------- */
:root,
:root[data-theme="light"] {
  --bg: #f4f1ea;
  --bg-raised: #fffdf9;
  --bg-side: #ebe6dc;
  --bg-head: #f8f5ef;
  --ink: #1c1a16;
  --ink-soft: #5c564b;
  --faint: #8c8475;
  --line: #e2dbcf;
  --line-strong: #c9bfae;
  --ok: #1d6a42;   --ok-bg: #e2f1e7;
  --warn: #855610; --warn-bg: #f7eed3;
  --bad: #8e2432;  --bad-bg: #f8e3e6;
  --info: #1d4f7a; --info-bg: #e2edf6;
  --code: #1f1d19;
  --code-ink: #f1ece2;
  --code-soft: #a39b8b;
  --code-line: #ffffff17;
  --inline-code: #ece5d8;
  --scrim: rgba(28, 26, 22, .3);
  --shadow: 0 1px 0 rgba(28, 26, 22, .04), 0 1px 3px rgba(28, 26, 22, .04);
  --shadow-lift: 0 6px 24px -10px rgba(28, 26, 22, .25);
  --gold: #8a6212;
  color-scheme: light;

  --sans: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --serif: "Source Serif 4", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Code", Menlo, monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --measure: 68ch;
}

/* ---------- Dark: shared semantic colours ---------- */
:root[data-theme="dark"] {
  --ok: #8dcea8;   --ok-bg: #18301f;
  --warn: #e6c278; --warn-bg: #352a12;
  --bad: #f2a3ab;  --bad-bg: #3a1c22;
  --info: #9fc6e6; --info-bg: #182a3a;
  --code-ink: #ece8e0;
  --code-line: #ffffff12;
  --scrim: rgba(0, 0, 0, .55);
  --shadow: 0 1px 0 rgba(0, 0, 0, .3);
  --shadow-lift: 0 10px 30px -12px rgba(0, 0, 0, .7);
  --gold: #e2b04a;
  color-scheme: dark;
}

/* Graphite — near-neutral, a hint of warmth (default dark) */
:root[data-theme="dark"],
:root[data-theme="dark"][data-dark="graphite"] {
  --bg: #141517;
  --bg-raised: #1c1d20;
  --bg-side: #18191b;
  --bg-head: #222327;
  --ink: #edebe7;
  --ink-soft: #b3b0aa;
  --faint: #7c7a76;
  --line: #2c2d31;
  --line-strong: #46474c;
  --code: #0e0f10;
  --code-soft: #8a8883;
  --inline-code: #2a2b2f;
}

/* Warm — tensref's current dark, lightly tuned */
:root[data-theme="dark"][data-dark="warm"] {
  --bg: #161310;
  --bg-raised: #221e19;
  --bg-side: #1b1714;
  --bg-head: #2a251f;
  --ink: #f3eee5;
  --ink-soft: #c3b8a8;
  --faint: #857a6d;
  --line: #362f28;
  --line-strong: #574a3e;
  --code: #0f0d0b;
  --code-soft: #958a7b;
  --inline-code: #362f28;
}

/* Ink — cool slate */
:root[data-theme="dark"][data-dark="ink"] {
  --bg: #0f141a;
  --bg-raised: #161d25;
  --bg-side: #121820;
  --bg-head: #1c2530;
  --ink: #e7edf4;
  --ink-soft: #a7b4c3;
  --faint: #6d7a8a;
  --line: #24303d;
  --line-strong: #3b4a5b;
  --code: #0a0e13;
  --code-soft: #7f8ea0;
  --inline-code: #24303d;
}

/* ---------- Per-site accents ---------- */
:root { --accent: var(--gold); }
[data-site="nicks"]    { --accent: #8a6212; }
[data-site="tensref"]  { --accent: #8d3b2a; }
[data-site="tenskit"]  { --accent: #0b6b68; }
[data-site="packages"] { --accent: #95520e; }
[data-theme="dark"][data-site="nicks"]    { --accent: #e2b04a; }
[data-theme="dark"][data-site="tensref"]  { --accent: #ec937c; }
[data-theme="dark"][data-site="tenskit"]  { --accent: #4fc8bd; }
[data-theme="dark"][data-site="packages"] { --accent: #f0a456; }
:root {
  --accent-soft: color-mix(in srgb, var(--accent) 12%, var(--bg-raised));
  --accent-line: color-mix(in srgb, var(--accent) 35%, var(--line));
  --selection: color-mix(in srgb, var(--accent) 28%, var(--bg));
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 var(--sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--selection); }
img, svg { max-width: 100%; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 .5em; text-wrap: balance; }
h1, h2 { font-family: var(--serif); font-weight: 600; letter-spacing: -.012em; }
h3, h4 { font-weight: 600; }
p { margin: 0 0 1em; }
code, kbd, pre, samp { font-family: var(--mono); font-size: .9em; }
:not(pre) > code {
  background: var(--inline-code); padding: .1em .35em; border-radius: 5px; font-size: .86em;
  overflow-wrap: anywhere;
}
hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }
.skip { position: absolute; left: -999px; top: 0; }
.skip:focus { left: 12px; top: 12px; z-index: 100; background: var(--bg-raised); padding: .5rem .8rem; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- Typography helpers ---------- */
.kicker {
  font: 600 .74rem/1 var(--sans); text-transform: uppercase; letter-spacing: .12em;
  color: var(--accent); margin: 0 0 .8rem;
}
.lede { font-size: 1.15rem; color: var(--ink-soft); max-width: 60ch; }
.muted { color: var(--ink-soft); }
.mono { font-family: var(--mono); }
.prose { max-width: var(--measure); }
.prose h2 { font-size: 1.6rem; margin-top: 2.2rem; }
.prose h3 { font-size: 1.12rem; margin-top: 1.8rem; }
.prose li { margin: .25rem 0; }
.prose table { margin: 1rem 0 1.4rem; }

/* ---------- Theme switcher (System / Light / Dark) ---------- */
.theme-switch {
  display: inline-flex; border: 1px solid var(--line-strong); border-radius: 999px;
  background: var(--bg-raised); padding: 2px; gap: 2px;
}
.theme-switch button {
  appearance: none; border: 0; background: transparent; color: var(--ink-soft);
  font: 500 .76rem/1 var(--sans); padding: .38rem .7rem; border-radius: 999px; cursor: pointer;
  display: inline-flex; align-items: center; gap: .35rem;
}
.theme-switch button svg { width: 14px; height: 14px; }
.theme-switch button:hover { color: var(--ink); }
.theme-switch button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.theme-switch.compact button span { display: none; }
.theme-switch.compact button { padding: .38rem .5rem; }

/* ---------- Brand mark ---------- */
.gn-mark { display: inline-flex; align-items: center; gap: .55rem; color: inherit; text-decoration: none; }
.gn-mark svg { width: 24px; height: 24px; color: var(--accent); flex: none; }
.gn-mark b { font: 600 1.05rem/1 var(--serif); letter-spacing: -.01em; }
.gn-mark small { color: var(--ink-soft); font-size: .74rem; letter-spacing: .02em; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem; padding: .62rem 1rem;
  border-radius: 10px; border: 1px solid var(--line-strong); background: var(--bg-raised);
  color: var(--ink); font: 500 .94rem/1 var(--sans); text-decoration: none; cursor: pointer;
}
.btn:hover { border-color: var(--ink-soft); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.btn.primary:hover { filter: brightness(1.08); }
.btn svg { width: 16px; height: 16px; }

/* ---------- Cards ---------- */
.card {
  display: flex; flex-direction: column; gap: .4rem;
  background: var(--bg-raised); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1rem 1.1rem 1.1rem; color: inherit; text-decoration: none; box-shadow: var(--shadow);
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
a.card:hover { border-color: var(--accent-line); box-shadow: var(--shadow-lift); transform: translateY(-1px); text-decoration: none; }
.card h3 { margin: 0; font-size: 1.05rem; }
.card p { margin: 0; color: var(--ink-soft); font-size: .93rem; }
.card .meta { margin-top: auto; padding-top: .4rem; font-size: .8rem; color: var(--faint); display: flex; flex-wrap: wrap; gap: .3rem .8rem; }
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr)); }

/* ---------- Pills / tags (text always carries meaning) ---------- */
.pill {
  display: inline-flex; align-items: center; gap: .3rem; font: 500 .74rem/1 var(--sans);
  padding: .28rem .55rem; border-radius: 999px; border: 1px solid var(--line); color: var(--ink-soft);
  background: var(--bg-raised); white-space: nowrap;
}
.pill svg { width: 12px; height: 12px; }
.pill.ok   { color: var(--ok);   background: var(--ok-bg);   border-color: transparent; }
.pill.warn { color: var(--warn); background: var(--warn-bg); border-color: transparent; }
.pill.bad  { color: var(--bad);  background: var(--bad-bg);  border-color: transparent; }
.pill.info { color: var(--info); background: var(--info-bg); border-color: transparent; }
.pill.accent { color: var(--accent); background: var(--accent-soft); border-color: var(--accent-line); }
.tags { display: flex; flex-wrap: wrap; gap: .4rem; padding: 0; margin: 0; list-style: none; }

/* ---------- Terminal / code blocks ---------- */
.term, pre.code {
  background: var(--code); color: var(--code-ink); border-radius: var(--radius-sm);
  margin: 0 0 1.1rem; position: relative; border: 1px solid var(--code-line);
}
.term .bar {
  display: flex; align-items: center; justify-content: space-between; gap: .5rem;
  padding: .4rem .5rem .4rem .9rem; border-bottom: 1px solid var(--code-line);
  font: 500 .74rem/1 var(--sans); color: var(--code-soft);
}
.term .bar .dots { display: inline-flex; gap: 6px; margin-right: .5rem; }
.term .bar .dots i { width: 9px; height: 9px; border-radius: 50%; background: #ffffff22; display: block; }
.term pre, pre.code {
  margin: 0; padding: .9rem 1rem 1rem; overflow-x: auto;
  font: .84rem/1.6 var(--mono); white-space: pre; tab-size: 8;
}
pre.code { padding: 1rem 1.1rem; }
.term .prompt { color: var(--code-soft); user-select: none; }
.term .cmt, pre.code .cmt { color: var(--code-soft); }
.term .hl { color: color-mix(in srgb, var(--accent) 55%, #fff); }
.copy {
  appearance: none; border: 1px solid #ffffff26; background: #ffffff10; color: var(--code-ink);
  font: 500 .72rem/1 var(--sans); padding: .38rem .6rem; border-radius: 6px; cursor: pointer;
}
.copy:hover { background: #ffffff20; }

/* ---------- Tabs ---------- */
.tabs { display: flex; flex-wrap: wrap; gap: .35rem; margin: 0 0 .9rem; }
.tab {
  appearance: none; border: 1px solid var(--line); background: var(--bg-raised); color: var(--ink-soft);
  font: 500 .86rem/1 var(--sans); padding: .55rem .85rem; border-radius: 999px; cursor: pointer;
}
.tab:hover { color: var(--ink); border-color: var(--line-strong); }
.tab[aria-selected="true"] { background: var(--accent-soft); border-color: var(--accent-line); color: var(--accent); }
[role="tabpanel"][hidden] { display: none; }

/* ---------- Tables ---------- */
.tablewrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--bg-raised); margin: 0 0 1.2rem; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: .6rem .85rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font: 600 .72rem/1.3 var(--sans); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-soft); background: var(--bg-head); }
tr:last-child td { border-bottom: 0; }
.prose table { border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--bg-raised); display: block; overflow-x: auto; }

/* ---------- Callouts ---------- */
.note {
  border: 1px solid var(--line); border-left: 3px solid var(--accent); background: var(--bg-raised);
  border-radius: var(--radius-sm); padding: .8rem 1rem; color: var(--ink-soft); font-size: .93rem; margin: 0 0 1.2rem;
}
.note strong { color: var(--ink); }

/* ---------- Family footer ---------- */
.family {
  border-top: 1px solid var(--line); margin-top: 4rem; padding: 1.6rem 0 2.4rem;
  font-size: .86rem; color: var(--ink-soft);
}
.family .in { display: flex; flex-wrap: wrap; gap: 1rem 2rem; align-items: center; justify-content: space-between; }
.family nav { display: flex; flex-wrap: wrap; gap: .3rem 1.2rem; }
.family a { color: var(--ink-soft); text-decoration: none; }
.family a:hover { color: var(--accent); }
.family a[aria-current] { color: var(--ink); font-weight: 600; }
.family .gn-mark svg { color: var(--gold); width: 18px; height: 18px; }

/* ---------- Concept badge (experiment chrome, not part of the designs) ---------- */
.concept-badge {
  position: fixed; right: 12px; bottom: 12px; z-index: 90;
  display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; justify-content: flex-end;
  font: 500 .72rem/1 var(--sans); color: #eee; background: #111c; backdrop-filter: blur(6px);
  padding: .35rem .4rem .35rem .7rem; border-radius: 999px; box-shadow: 0 4px 18px #0004;
  max-width: calc(100vw - 24px);
}
.concept-badge a { color: #fff; }
.concept-badge select {
  font: inherit; background: #ffffff1a; color: #fff; border: 1px solid #ffffff33; border-radius: 999px;
  padding: .25rem .4rem;
}
.concept-badge select option { color: #000; }
.concept-badge button { all: unset; cursor: pointer; padding: 0 .3rem; opacity: .7; }
.concept-badge.min > :not(button) { display: none; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }

/* Grid children default to min-width:auto; long <pre> lines would widen the page. */
.layout > *, .step > *, .sheet > *, .two > *, .intro > *, .pair > *, .split > *, .hero > * { min-width: 0; }