/* starbase theme — clean, explorable knowledge-base styling. */
:root {
  --bg: #0e1116;
  --bg-elev: #161b22;
  --bg-elev2: #1c2430;
  --border: #273140;
  --text: #d7dde6;
  --text-dim: #93a1b3;
  --text-faint: #65728a;
  --accent: #5b9cff;
  --accent-soft: rgba(91, 156, 255, 0.14);
  --accent-2: #8b7cff;
  --good: #59d499;
  --warn: #ffcc66;
  --danger: #ff6b81;
  --radius: 10px;
  --maxw: 760px;
  --sidebar: 290px;
  --rail: 220px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", "Source Serif Pro", Georgia, serif;
}
/* Daylight — clean light theme */
html[data-theme="light"] {
  --bg: #fbfcfe; --bg-elev: #ffffff; --bg-elev2: #f1f4f9; --border: #e2e8f2;
  --text: #1c2532; --text-dim: #51607a; --text-faint: #8492aa;
  --accent: #2b6ce6; --accent-soft: rgba(43, 108, 230, 0.10); --accent-2: #7c5cff;
  --good: #1ca672; --warn: #c9930a; --danger: #e0455f;
}
/* Nord — cool arctic palette */
html[data-theme="nord"] {
  --bg: #2e3440; --bg-elev: #353d4c; --bg-elev2: #3b4252; --border: #434c5e;
  --text: #e5e9f0; --text-dim: #c2cad9; --text-faint: #7e899c;
  --accent: #88c0d0; --accent-soft: rgba(136, 192, 208, 0.16); --accent-2: #b48ead;
  --good: #a3be8c; --warn: #ebcb8b; --danger: #bf616a;
}
/* Solarized — warm light palette */
html[data-theme="solarized"] {
  --bg: #fdf6e3; --bg-elev: #f7f0dc; --bg-elev2: #eee8d5; --border: #e3ddc9;
  --text: #586e75; --text-dim: #657b83; --text-faint: #93a1a1;
  --accent: #268bd2; --accent-soft: rgba(38, 139, 210, 0.12); --accent-2: #6c71c4;
  --good: #859900; --warn: #b58900; --danger: #dc322f;
}
/* Grape — vivid dark purple */
html[data-theme="grape"] {
  --bg: #1e1b2e; --bg-elev: #282440; --bg-elev2: #322c4d; --border: #3b3357;
  --text: #ece8fa; --text-dim: #b8aedd; --text-faint: #8076a6;
  --accent: #bd93f9; --accent-soft: rgba(189, 147, 249, 0.16); --accent-2: #ff79c6;
  --good: #54e08a; --warn: #f1d86c; --danger: #ff5d6c;
}
/* Forest — deep green */
html[data-theme="forest"] {
  --bg: #0f1a14; --bg-elev: #16241c; --bg-elev2: #1d2f24; --border: #284a37;
  --text: #d8e8db; --text-dim: #9bb6a4; --text-faint: #6b8676;
  --accent: #57c98a; --accent-soft: rgba(87, 201, 138, 0.16); --accent-2: #9bd17c;
  --good: #7fe0a0; --warn: #e3c46b; --danger: #e0726b;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 1.5rem; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: var(--sans); font-size: 16px; line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- shell layout ---- */
.sg-shell { display: grid; grid-template-columns: var(--sidebar) 1fr; min-height: 100vh; }
.sg-sidebar {
  position: sticky; top: 0; align-self: start; height: 100vh;
  background: var(--bg-elev); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; min-height: 0;
}
.sg-sidebar-head { flex: none; padding: 1.3rem 1rem 0.9rem; display: flex; flex-direction: column;
  gap: 0.8rem; border-bottom: 1px solid var(--border); }
.sg-sidebar-foot { flex: none; padding: 0.7rem 1rem; border-top: 1px solid var(--border); }
.sg-brand { font-weight: 700; font-size: 1.15rem; letter-spacing: -0.02em; color: var(--text); }
.sg-brand:hover { text-decoration: none; color: var(--accent); }
.sg-filter {
  width: 100%; padding: 0.5rem 0.7rem; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--bg); color: var(--text); font-size: 0.85rem;
}
.sg-filter:focus { outline: none; border-color: var(--accent); }

.sg-theme { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem;
  font-size: 0.78rem; color: var(--text-faint); }
.sg-theme-select { flex: 1; max-width: 60%; padding: 0.32rem 0.5rem; border-radius: 7px;
  border: 1px solid var(--border); background: var(--bg); color: var(--text); font-size: 0.8rem; cursor: pointer; }
.sg-theme-select:focus { outline: none; border-color: var(--accent); }

.sg-nav { flex: 1 1 auto; min-height: 0; overflow-y: auto; padding: 0.6rem 1rem 2rem; font-size: 0.9rem; }
.sg-nav ul { list-style: none; margin: 0; padding: 0; }
.sg-nav details ul { margin-left: 0.3rem; border-left: 1px solid var(--border); padding-left: 0.55rem; }
.sg-nav li { margin: 0.05rem 0; }
.sg-nav a { color: var(--text-dim); display: block; padding: 0.2rem 0.45rem; border-radius: 6px; }
.sg-nav a:hover { background: var(--bg-elev2); color: var(--text); text-decoration: none; }
.sg-nav a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.sg-nav li.sg-hidden { display: none; }

/* collapsible section groups */
.sg-nav details > summary { list-style: none; cursor: pointer; display: flex; align-items: center;
  gap: 0.3rem; padding: 0.42rem 0.4rem 0.22rem; color: var(--text-faint);
  text-transform: uppercase; font-size: 0.7rem; letter-spacing: 0.07em; font-weight: 700; }
.sg-nav details > summary::-webkit-details-marker { display: none; }
.sg-nav details > summary::before { content: "▸"; font-size: 0.7em; transition: transform 0.15s;
  color: var(--text-faint); flex: none; }
.sg-nav details[open] > summary::before { transform: rotate(90deg); }
.sg-nav details > summary a, .sg-nav details > summary span { color: inherit; padding: 0; flex: 1; }
.sg-nav details > summary a:hover { background: none; color: var(--accent); }
.sg-nav .sg-nav-section.sg-active > details > summary { color: var(--text-dim); }
.sg-nav-divider { height: 0; border-top: 1px solid var(--border); margin: 0.7rem 0.2rem; list-style: none; }

/* global search dropdown */
.sg-search { position: relative; }
.sg-search-results { position: absolute; top: calc(100% + 4px); left: 0; right: 0; z-index: 40;
  max-height: 60vh; overflow-y: auto; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: 0 10px 30px rgba(0,0,0,0.35); padding: 0.3rem; }
.sg-search-hit { display: flex; flex-direction: column; gap: 0.05rem; padding: 0.4rem 0.55rem;
  border-radius: 7px; color: var(--text); }
.sg-search-hit:hover { background: var(--accent-soft); text-decoration: none; }
.sg-search-t { font-weight: 600; font-size: 0.88rem; }
.sg-search-s { font-size: 0.72rem; color: var(--text-faint); }
.sg-search-empty { padding: 0.6rem; color: var(--text-faint); font-size: 0.85rem; }

/* ---- main column ---- */
.sg-main-wrap { display: grid; grid-template-columns: minmax(0, 1fr) var(--rail); gap: 2rem;
  max-width: calc(var(--maxw) + var(--rail) + 6rem); margin: 0 auto; padding: 2.2rem 2.4rem; width: 100%; }
.sg-main { min-width: 0; }
.sg-breadcrumbs { font-size: 0.82rem; color: var(--text-faint); margin-bottom: 1rem; }
.sg-breadcrumbs a { color: var(--text-faint); }
.sg-breadcrumbs .sep { margin: 0 0.4rem; opacity: 0.5; }

.sg-article-head h1 { font-size: 2.3rem; line-height: 1.12; letter-spacing: -0.025em;
  margin: 0 0 0.5rem; font-weight: 750; }
.sg-meta { display: flex; flex-wrap: wrap; gap: 0.5rem 0.8rem; align-items: center;
  color: var(--text-faint); font-size: 0.82rem; margin-bottom: 0.8rem; }
.sg-tag { background: var(--bg-elev2); padding: 0.1rem 0.5rem; border-radius: 999px;
  color: var(--text-dim); font-size: 0.76rem; }
.sg-tag:hover { text-decoration: none; color: var(--accent); }
.sg-label { outline: 1px dashed var(--text-faint); outline-offset: -1px; }
.sg-summary { font-size: 1.1rem; color: var(--text-dim); margin: 0 0 1.5rem;
  font-family: var(--serif); font-style: italic; }

/* ---- content typography ---- */
.sg-content { font-size: 1.02rem; }
.sg-content h2 { font-size: 1.5rem; margin: 2.4rem 0 0.8rem; letter-spacing: -0.02em;
  padding-bottom: 0.3rem; border-bottom: 1px solid var(--border); scroll-margin-top: 1.5rem; }
.sg-content h3 { font-size: 1.2rem; margin: 1.8rem 0 0.6rem; scroll-margin-top: 1.5rem; }
.sg-content h4 { font-size: 1.02rem; color: var(--text-dim); margin: 1.4rem 0 0.5rem; }
.sg-content p { margin: 0.85rem 0; }
.sg-content ul, .sg-content ol { padding-left: 1.4rem; }
.sg-content li { margin: 0.3rem 0; }
.sg-content img { max-width: 100%; border-radius: var(--radius); }
.sg-content blockquote { margin: 1.2rem 0; padding: 0.4rem 1.1rem; border-left: 3px solid var(--accent);
  background: var(--bg-elev); color: var(--text-dim); border-radius: 0 var(--radius) var(--radius) 0; }
.sg-content hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }
.sg-content a.sg-deadlink { color: var(--danger); border-bottom: 1px dashed var(--danger); cursor: help; }

code { font-family: var(--mono); font-size: 0.88em; background: var(--bg-elev2);
  padding: 0.12em 0.38em; border-radius: 5px; }
pre { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1rem 1.1rem; overflow-x: auto; line-height: 1.5; }
pre code { background: none; padding: 0; font-size: 0.85rem; }

table { border-collapse: collapse; width: 100%; margin: 1.2rem 0; font-size: 0.92rem; }
th, td { border: 1px solid var(--border); padding: 0.5rem 0.7rem; text-align: left; }
th { background: var(--bg-elev); }

/* ---- TOC ---- */
.sg-toc-rail { position: relative; }
.sg-toc-sticky { position: sticky; top: 1.5rem; font-size: 0.84rem; }
.sg-toc-label { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.7rem;
  color: var(--text-faint); font-weight: 700; margin: 0 0 0.5rem; }
.sg-toc { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border); }
.sg-toc li a { display: block; padding: 0.18rem 0 0.18rem 0.8rem; color: var(--text-faint);
  border-left: 2px solid transparent; margin-left: -1px; }
.sg-toc li a:hover { color: var(--text); text-decoration: none; }
.sg-toc li a.sg-toc-active { color: var(--accent); border-left-color: var(--accent); }
.sg-toc-h3 a { padding-left: 1.6rem; font-size: 0.95em; }
.sg-toc-inline { display: none; }

/* ---- explore footer ---- */
.sg-explore { margin-top: 3.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border);
  display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.sg-explore h2 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--text-faint); margin: 0 0 0.7rem; }
.sg-explore ul { list-style: none; margin: 0; padding: 0; }
.sg-related li { margin-bottom: 0.55rem; }
.sg-related a { font-weight: 600; }
.sg-rel-sum { display: block; color: var(--text-faint); font-size: 0.82rem; font-weight: 400; }
.sg-backlinks li { margin-bottom: 0.3rem; font-size: 0.92rem; }

/* ---- shortcodes / widgets ---- */
.sg-figure { margin: 1.6rem 0; }
.sg-figure figcaption { color: var(--text-faint); font-size: 0.85rem; text-align: center; margin-top: 0.5rem; }
.sg-fig-title { font-weight: 600; color: var(--text-dim); text-align: center; margin-bottom: 0.4rem; }
.sg-widget { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1rem; }
.sg-canvas { display: block; width: 100%; border-radius: 6px; }
.sg-sim-stage { position: relative; }
.sg-sim-controls { position: absolute; top: 0.5rem; right: 0.5rem; display: flex; gap: 0.3rem; }
.sg-btn { background: var(--bg-elev2); color: var(--text); border: 1px solid var(--border);
  border-radius: 6px; width: 2rem; height: 2rem; cursor: pointer; font-size: 0.9rem; }
.sg-btn:hover { border-color: var(--accent); color: var(--accent); }

.sg-note { margin: 1.4rem 0; padding: 0.8rem 1.1rem; border-radius: var(--radius);
  border: 1px solid var(--border); border-left: 4px solid var(--text-faint); background: var(--bg-elev); }
.sg-note-title { font-weight: 700; margin: 0 0 0.3rem; }
.sg-note-body > :first-child { margin-top: 0; }
.sg-note-body > :last-child { margin-bottom: 0; }
.sg-note-note { border-left-color: var(--accent); }
.sg-note-tip { border-left-color: var(--good); }
.sg-note-warning { border-left-color: var(--warn); }
.sg-note-danger { border-left-color: var(--danger); }
.sg-note-key, .sg-note-insight { border-left-color: var(--accent-2); }

.sg-columns { display: grid; grid-template-columns: repeat(var(--sg-cols, 2), 1fr); gap: 1.5rem; }
.sg-columns > * { min-width: 0; }

.sg-eq { display: flex; align-items: center; gap: 1rem; margin: 1.4rem 0; justify-content: center; }
.sg-eq-num { color: var(--text-faint); }
.sg-math-display { overflow-x: auto; }

/* evidence-backed claims */
.sg-claim { margin: 1.2rem 0; padding: 0.7rem 1rem; border-left: 3px solid var(--accent-2);
  background: var(--bg-elev); border-radius: 0 var(--radius) var(--radius) 0; }
.sg-claim-text > :first-child { margin-top: 0; }
.sg-claim-text > :last-child { margin-bottom: 0; }
.sg-claim-badge { display: inline-block; vertical-align: middle; margin-left: 0.4rem;
  font-size: 0.62rem; text-transform: uppercase; letter-spacing: 0.06em; font-weight: 700;
  padding: 0.08rem 0.4rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.sg-claim-badge::before { content: "✓ "; }
.sg-claim-unsupported { background: rgba(255, 204, 102, 0.16); color: var(--warn); }
.sg-claim-unsupported::before { content: "? "; }
.sg-evidence { margin-top: 0.6rem; font-size: 0.9rem; }
.sg-evidence > summary { cursor: pointer; color: var(--text-faint); font-size: 0.78rem;
  text-transform: uppercase; letter-spacing: 0.06em; font-weight: 700; }
.sg-evidence > summary:hover { color: var(--accent); }
.sg-ev-meta { color: var(--text-faint); font-size: 0.82rem; margin: 0.5rem 0; }
.sg-ev-meta code { font-size: 0.8rem; }
.sg-ev-result { font-size: 1.1rem; margin: 0.4rem 0; }
.sg-ev-table { width: auto; min-width: 40%; margin: 0.5rem 0; font-size: 0.84rem; }
.sg-ev-table th { background: var(--bg-elev2); }
.sg-ev-code { margin: 0.5rem 0 0; }
.sg-claim-verified { color: var(--ok, #4caf82); border-color: var(--ok, #4caf82); }

/* injected evidence values ({{< val >}}) — computed at build time, not typed */
.sg-content .sg-val { border-bottom: 1px dotted var(--accent-2); cursor: help; }
.sg-content .sg-val-err { color: var(--danger); border-bottom: 1px dashed var(--danger); }
.sg-data { margin: 0.6rem 0; }

.sg-quiz { margin: 1.6rem 0; }
.sg-quiz-q { font-weight: 600; margin: 0 0 0.7rem; }
.sg-quiz-options { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.4rem; }
.sg-quiz-opt { width: 100%; text-align: left; padding: 0.55rem 0.8rem; cursor: pointer;
  background: var(--bg-elev2); border: 1px solid var(--border); border-radius: 8px; color: var(--text);
  font: inherit; transition: background 0.15s; }
.sg-quiz-opt:hover { border-color: var(--accent); }
.sg-quiz-opt.sg-correct { border-color: var(--good); background: rgba(89, 212, 153, 0.14); }
.sg-quiz-opt.sg-wrong { border-color: var(--danger); background: rgba(255, 107, 129, 0.12); }
.sg-quiz-explain { margin-top: 0.7rem; padding: 0.6rem 0.9rem; background: var(--bg-elev);
  border-radius: 8px; color: var(--text-dim); font-size: 0.92rem; }

/* ---- index / landing ---- */
.sg-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 1rem;
  list-style: none; padding: 0; margin: 1.5rem 0; }
.sg-card { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.1rem 1.2rem; transition: transform 0.12s, border-color 0.12s; }
.sg-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.sg-card h3 { margin: 0 0 0.35rem; font-size: 1.05rem; }
.sg-card p { margin: 0; color: var(--text-faint); font-size: 0.88rem; }
.sg-card a { color: var(--text); }
.sg-card a:hover { text-decoration: none; }

/* ---- mobile ---- */
.sg-menu-toggle { display: none; position: fixed; top: 0.7rem; left: 0.7rem; z-index: 30;
  background: var(--bg-elev); border: 1px solid var(--border); color: var(--text);
  width: 2.4rem; height: 2.4rem; border-radius: 8px; font-size: 1.1rem; cursor: pointer; }
@media (max-width: 1100px) {
  .sg-main-wrap { grid-template-columns: minmax(0,1fr); }
  .sg-toc-rail { display: none; }
  .sg-toc-inline { display: block; margin: 1rem 0 1.5rem; background: var(--bg-elev);
    border: 1px solid var(--border); border-radius: var(--radius); padding: 0.6rem 1rem; }
  .sg-toc-inline summary { cursor: pointer; font-weight: 600; }
  .sg-explore { grid-template-columns: 1fr; }
}
@media (max-width: 800px) {
  .sg-menu-toggle { display: block; }
  .sg-shell { grid-template-columns: 1fr; }
  .sg-sidebar { position: fixed; z-index: 20; width: var(--sidebar); transform: translateX(-100%);
    transition: transform 0.2s; }
  body.sg-nav-open .sg-sidebar { transform: translateX(0); }
  .sg-main-wrap { padding: 3.5rem 1.2rem 2rem; }
  .sg-columns { grid-template-columns: 1fr; }
}