:root {
  --bg: #f6f3ee;
  --panel: #fffdf8;
  --panel-2: #efeae2;
  --ink: #1b1d22;
  --ink-2: #3a3f48;
  --muted: #6b6f78;
  --line: #d9d3c7;
  --line-2: #c8c1b2;
  --accent: #11266b;
  --accent-ink: #07153f;
  --warn: #8a4a1a;
  --ok: #2a5d3a;
  --code-bg: #f1ecdf;
  --sidebar-w: 300px;
  --toc-w: 220px;
  --maxw: 820px;
  --radius: 4px;
  --density: 1;
}
[data-theme="dark"] {
  --bg: #1f1e1d;
  --panel: #262524;
  --panel-2: #2f2e2c;
  --ink: #f5f4ee;
  --ink-2: #d8d5cb;
  --muted: #a8a59c;
  --line: #3a3936;
  --line-2: #4a4945;
  --accent: #d4a27f;
  --accent-ink: #e6bf9e;
  --warn: #d8a371;
  --ok: #a3c79a;
  --code-bg: #2c2b29;
}
[data-theme="dark"] a { color: var(--accent); }
[data-theme="dark"] a:hover { color: var(--accent-ink); }
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); font-family: 'Inter Tight', system-ui, sans-serif; font-size: 15px; line-height: 1.6; -webkit-font-smoothing: antialiased; }

/* Scrollbars — match theme, transparent track */
* { scrollbar-width: thin; scrollbar-color: var(--line-2) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb { background-color: var(--line-2); border-radius: 10px; border: 2px solid transparent; background-clip: content-box; }
*::-webkit-scrollbar-thumb:hover { background-color: var(--muted); }
*::-webkit-scrollbar-corner { background: transparent; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, .mono { font-family: 'IBM Plex Mono', monospace; font-size: 0.88em; }
code:not(pre code) { background: var(--code-bg); padding: 1px 6px; border-radius: 3px; color: var(--ink); }
pre { background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; overflow-x: auto; font-size: 13px; line-height: 1.55; }
pre code { background: none; padding: 0; }

/* Layout */
.app { display: grid; grid-template-columns: var(--sidebar-w) 1fr; min-height: 100vh; }
@media (max-width: 960px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: sticky; top: 0; z-index: 20; width: 100% !important; height: auto !important; max-height: 100vh; border-right: 0 !important; border-bottom: 1px solid var(--line); }
  .sidebar .search, .sidebar .nav { display: none; }
  .sidebar.is-open { max-height: 100vh; overflow-y: auto; }
  .sidebar.is-open .search, .sidebar.is-open .nav { display: block; }
  .sidebar.is-open .nav { flex: 0 1 auto; max-height: calc(100vh - 200px); }

  /* Compact header: title left, controls top-right */
  .brand { padding: 12px 16px; display: flex; align-items: center; gap: 10px; }
  .brand__text { flex: 1 1 auto; min-width: 0; }
  .brand__title { font-size: 16px; line-height: 1.2; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .brand__meta { display: none; }
  .brand__controls { display: flex; align-items: center; gap: 6px; flex: 0 0 auto; }
  .brand__controls .theme-toggle, .brand__controls .nav-toggle { margin-top: 0; padding: 6px 8px; }
  .brand__controls .theme-toggle__label, .brand__controls .nav-toggle__label { display: none; }
}

/* Sidebar */
.sidebar { position: sticky; top: 0; height: 100vh; width: var(--sidebar-w); border-right: 1px solid var(--line); background: var(--panel); display: flex; flex-direction: column; }
.brand { padding: 24px 24px 18px; border-bottom: 1px solid var(--line); }
.brand__controls { display: contents; }
.brand__eyebrow { font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; font-weight: 500; }
.brand__title { font-family: 'Fraunces', serif; font-weight: 600; font-size: 22px; line-height: 1.15; letter-spacing: -0.01em; color: var(--ink); }
.brand__version { margin-top: 6px; font-size: 12px; color: var(--muted); font-family: 'IBM Plex Mono', monospace; }
.brand__meta { margin-top: 6px; font-size: 12px; color: var(--muted); font-family: 'IBM Plex Mono', monospace; }
.theme-toggle { margin-top: 16px; display: inline-flex; align-items: center; gap: 8px; background: var(--bg); border: 1px solid var(--line); color: var(--ink-2); font: inherit; font-size: 12px; padding: 7px 11px 7px 9px; border-radius: 999px; cursor: pointer; transition: border-color .15s, color .15s, background .15s; }
.theme-toggle:hover { border-color: var(--line-2); color: var(--ink); }
.theme-toggle__icon { width: 14px; height: 14px; border-radius: 50%; background: radial-gradient(circle at 65% 35%, var(--ink) 0 50%, transparent 51%), var(--bg); border: 1.5px solid var(--ink-2); position: relative; }
[data-theme="dark"] .theme-toggle__icon { background: radial-gradient(circle at 35% 35%, transparent 0 45%, var(--ink) 46%); border-color: var(--ink-2); }
.theme-toggle__label { font-family: 'IBM Plex Mono', monospace; letter-spacing: 0.02em; }

/* Mobile nav toggle (hamburger) */
.nav-toggle { display: none; margin-top: 10px; align-items: center; gap: 8px; background: var(--bg); border: 1px solid var(--line); color: var(--ink-2); font: inherit; font-size: 12px; padding: 7px 11px 7px 9px; border-radius: 999px; cursor: pointer; transition: border-color .15s, color .15s, background .15s; }
.nav-toggle:hover { border-color: var(--line-2); color: var(--ink); }
.nav-toggle__bars { width: 14px; height: 10px; position: relative; display: inline-block; }
.nav-toggle__bars::before, .nav-toggle__bars::after { content: ''; position: absolute; left: 0; right: 0; height: 1.5px; background: var(--ink-2); transition: transform .2s, top .2s, bottom .2s, box-shadow .2s; }
.nav-toggle__bars::before { top: 1px; box-shadow: 0 4px 0 var(--ink-2); }
.nav-toggle__bars::after { bottom: 1px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); box-shadow: none; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { bottom: 4px; transform: rotate(-45deg); }
.nav-toggle__label { font-family: 'IBM Plex Mono', monospace; letter-spacing: 0.02em; }
@media (max-width: 960px) { .nav-toggle { display: inline-flex; } }
.search { padding: 14px 18px; border-bottom: 1px solid var(--line); }
.search input { width: 100%; background: var(--bg); border: 1px solid var(--line); color: var(--ink); font: inherit; font-size: 13px; padding: 8px 10px; border-radius: var(--radius); outline: none; }
.search input:focus { border-color: var(--accent); }
.nav { flex: 1; overflow-y: auto; padding: 10px 10px 40px; }
.nav__group { margin: 6px 0 14px; }
.nav__group-title { font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); padding: 10px 12px 6px; font-weight: 600; }
.nav a { display: block; padding: 5px 12px; color: var(--ink-2); font-size: 13.5px; border-radius: 3px; border-left: 2px solid transparent; line-height: 1.35; }
.nav a:hover { background: var(--panel-2); text-decoration: none; color: var(--ink); }
.nav a.is-active { color: var(--accent); border-left-color: var(--accent); background: var(--panel-2); }
.nav a.is-sub { padding-left: 24px; font-size: 12.5px; color: var(--muted); }
.nav a.is-hidden { display: none; }

/* Content */
.content { padding: calc(48px * var(--density)) 48px 120px; max-width: calc(var(--maxw) + 96px); width: 100%; }
.content section { scroll-margin-top: 24px; padding-top: calc(28px * var(--density)); padding-bottom: calc(20px * var(--density)); }
html { scroll-behavior: smooth; }
.content section + section { border-top: 1px solid var(--line); margin-top: calc(24px * var(--density)); }

h1, h2, h3, h4 { font-family: 'Fraunces', serif; font-weight: 600; letter-spacing: -0.01em; color: var(--ink); margin: 0 0 12px; line-height: 1.15; }
h1 { font-size: 40px; margin-bottom: 6px; }
h2 { font-size: 28px; margin-top: 10px; margin-bottom: 14px; }
h3 { font-size: 19px; font-family: 'Inter Tight', sans-serif; font-weight: 600; margin: 22px 0 8px; letter-spacing: -0.005em; }
h4 { font-size: 14px; font-family: 'Inter Tight', sans-serif; font-weight: 600; margin: 14px 0 6px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
p { margin: 8px 0 12px; color: var(--ink-2); }
ul, ol { padding-left: 20px; color: var(--ink-2); }
li { margin: 3px 0; }
.lede { font-size: 17px; line-height: 1.55; color: var(--ink-2); max-width: 64ch; margin: 8px 0 20px; }

.eyebrow { font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); font-weight: 600; margin-bottom: 10px; }

/* Callouts */
.callout { border: 1px solid var(--line); background: var(--panel); padding: 14px 16px; margin: 14px 0; font-size: 13.5px; color: var(--ink-2); display: grid; grid-template-columns: 88px 1fr; gap: 14px; align-items: start; }
.callout__tag { font-family: 'IBM Plex Mono', monospace; font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); padding-top: 2px; }
.callout--warn { border-color: var(--warn); }
.callout--warn .callout__tag { color: var(--warn); }
.callout--ok { border-color: var(--ok); }
.callout--ok .callout__tag { color: var(--ok); }

/* Badges / chips */
.chip { display: inline-flex; align-items: center; gap: 5px; font-family: 'IBM Plex Mono', monospace; font-size: 11px; padding: 3px 8px; border: 1px solid var(--line-2); border-radius: 100px; color: var(--ink-2); background: var(--panel); }
.chip--accent { border-color: var(--accent); color: var(--accent); }
.chip--muted { color: var(--muted); }

/* Key-value grid */
.kv { display: grid; grid-template-columns: 180px 1fr; gap: 6px 18px; border-top: 1px solid var(--line); padding-top: 10px; margin-top: 8px; font-size: 13.5px; }
.kv dt { color: var(--muted); font-family: 'IBM Plex Mono', monospace; font-size: 12px; padding-top: 2px; }
.kv dd { margin: 0; color: var(--ink-2); }
.kv dt, .kv dd { padding-bottom: 10px; border-bottom: 1px dashed var(--line); }

/* Feature grid */
.grid { display: grid; gap: 12px; }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 760px) { .grid--3, .grid--2 { grid-template-columns: 1fr; } }
.card { border: 1px solid var(--line); background: var(--panel); padding: 14px 16px; }
.card__kicker { font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); font-weight: 600; margin-bottom: 6px; }
.card h4 { margin: 0 0 6px; text-transform: none; letter-spacing: 0; font-size: 15px; color: var(--ink); }
.card p { margin: 0; font-size: 13.5px; }

/* URL map */
.urlmap { border: 1px solid var(--line); background: var(--panel); margin: 16px 0; }
.urlmap__row { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 16px; padding: 10px 14px; border-top: 1px solid var(--line); align-items: baseline; font-size: 13px; }
.urlmap__row:first-child { border-top: 0; background: var(--panel-2); font-family: 'IBM Plex Mono', monospace; font-size: 11px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
.urlmap__url { font-family: 'IBM Plex Mono', monospace; color: var(--ink); }
.urlmap__ctrl { font-family: 'IBM Plex Mono', monospace; color: var(--muted); font-size: 12px; }
.urlmap__desc { color: var(--ink-2); }

/* Page anatomy diagram */
.anatomy { border: 1px solid var(--line); background: var(--panel); margin: 16px 0; padding: 12px; }
.anatomy__grid { display: grid; grid-template-columns: 52px 1fr 1fr; gap: 0; }
.anatomy__row { display: contents; }
.anatomy__num, .anatomy__block, .anatomy__note { border-top: 1px solid var(--line); padding: 10px 12px; font-size: 13px; }
.anatomy__row:first-child .anatomy__num, .anatomy__row:first-child .anatomy__block, .anatomy__row:first-child .anatomy__note { border-top: 0; }
.anatomy__num { font-family: 'IBM Plex Mono', monospace; color: var(--muted); font-size: 12px; text-align: right; padding-right: 14px; }
.anatomy__block { color: var(--ink); font-weight: 500; }
.anatomy__note { color: var(--muted); font-size: 12.5px; }
.anatomy__block-tag { font-family: 'IBM Plex Mono', monospace; font-size: 11px; color: var(--accent); display: block; margin-top: 2px; }

/* Entity relationship */
.erd { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 16px 0; }
@media (max-width: 900px) { .erd { grid-template-columns: repeat(2, 1fr); } }
.ent { border: 1px solid var(--line); background: var(--panel); padding: 10px 12px; }
.ent h4 { margin: 0 0 6px; font-size: 13px; text-transform: none; letter-spacing: 0; color: var(--ink); font-family: 'IBM Plex Mono', monospace; border-bottom: 1px solid var(--line); padding-bottom: 5px; }
.ent ul { list-style: none; padding: 0; margin: 4px 0 0; }
.ent li { font-family: 'IBM Plex Mono', monospace; font-size: 11.5px; color: var(--ink-2); padding: 2px 0; }
.ent li .dim { color: var(--muted); }
.ent-rel { font-size: 12px; color: var(--muted); text-align: center; margin: 6px 0 0; font-family: 'IBM Plex Mono', monospace; }

/* Lifecycle */
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin: 16px 0; align-items: stretch; }
@media (max-width: 900px) { .flow { grid-template-columns: 1fr; } }
.flow__step { border: 1px solid var(--line); background: var(--panel); padding: 10px 12px; position: relative; font-size: 12.5px; }
.flow__step .n { font-family: 'IBM Plex Mono', monospace; font-size: 11px; color: var(--muted); display: block; margin-bottom: 3px; }
.flow__step .t { color: var(--ink); font-weight: 500; font-size: 13px; margin-bottom: 3px; display: block; }
.flow__step .d { color: var(--muted); font-size: 12px; }

/* Not-doing list */
.nope { margin: 12px 0; border-left: 2px solid var(--line-2); padding-left: 14px; }
.nope li { color: var(--muted); margin: 5px 0; }
.nope li::marker { color: var(--line-2); }

/* TOC right rail — collapsed on small */
.rightrail { position: sticky; top: 20px; align-self: start; padding: 24px 0 40px 28px; border-left: 1px solid var(--line); font-size: 12.5px; }
.rightrail h5 { font-family: 'IBM Plex Mono', monospace; font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin: 0 0 10px; font-weight: 600; }
.rightrail a { display: block; color: var(--muted); padding: 3px 0; line-height: 1.3; }
.rightrail a.is-active { color: var(--accent); }
.rightrail a:hover { color: var(--ink); text-decoration: none; }

.contentwrap { display: grid; grid-template-columns: 1fr var(--toc-w); gap: 0; }
@media (max-width: 1200px) { .contentwrap { grid-template-columns: 1fr; } .rightrail { display: none; } }

/* Section marker */
.secnum { font-family: 'IBM Plex Mono', monospace; color: var(--muted); font-size: 12px; letter-spacing: 0.1em; margin-right: 10px; }

/* Footer */
.endmark { margin-top: 50px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; font-family: 'IBM Plex Mono', monospace; }