:root {
  --ground:      #F4F6F8;
  --surface:     #FFFFFF;
  --surface-alt: #EDF0F4;
  --ink:         #161A20;
  --ink-soft:    #39414D;
  --muted:       #59626F;
  --rule:        #DCE1E8;
  --rule-strong: #C3CBD5;
  --accent:      #A8681B;
  --accent-ink:  #6F4310;
  --accent-wash: #F6ECDD;
  --flag-wash:   #FBF3E4;
  --term-bg:     #191D24;
  --term-ink:    #D6DBE2;
  --term-muted:  #7C8797;
  --term-accent: #DFA455;

  --mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --measure: 68ch;
  --step-0: 1rem;
  --step-1: 1.1875rem;
  --step-2: 1.4375rem;
  --step-3: 1.875rem;
  --step-4: 2.625rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ground:      #0F1216;
    --surface:     #161A20;
    --surface-alt: #1C222A;
    --ink:         #E4E8ED;
    --ink-soft:    #C2CAD4;
    --muted:       #98A2AF;
    --rule:        #252B33;
    --rule-strong: #333B45;
    --accent:      #DFA455;
    --accent-ink:  #EFC084;
    --accent-wash: #241C10;
    --flag-wash:   #211A0F;
  }
}

:root[data-theme="dark"] {
  --ground:      #0F1216;
  --surface:     #161A20;
  --surface-alt: #1C222A;
  --ink:         #E4E8ED;
  --ink-soft:    #C2CAD4;
  --muted:       #98A2AF;
  --rule:        #252B33;
  --rule-strong: #333B45;
  --accent:      #DFA455;
  --accent-ink:  #EFC084;
  --accent-wash: #241C10;
  --flag-wash:   #211A0F;
}

:root[data-theme="light"] {
  --ground:      #F4F6F8;
  --surface:     #FFFFFF;
  --surface-alt: #EDF0F4;
  --ink:         #161A20;
  --ink-soft:    #39414D;
  --muted:       #59626F;
  --rule:        #DCE1E8;
  --rule-strong: #C3CBD5;
  --accent:      #A8681B;
  --accent-ink:  #6F4310;
  --accent-wash: #F6ECDD;
  --flag-wash:   #FBF3E4;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--step-0);
  line-height: 1.65;
  font-synthesis-weight: none;
}

a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }

.skip { position: absolute; left: -9999px; top: 0; background: var(--surface); color: var(--ink); padding: .6rem 1rem; z-index: 20; border: 1px solid var(--rule-strong); }
.skip:focus { left: 1rem; top: 1rem; }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 clamp(1.1rem, 4vw, 2.5rem); }

/* ---------- site nav ---------- */

.sitenav { border-bottom: 1px solid var(--rule); background: var(--surface); position: sticky; top: 0; z-index: 10; }
.sitenav-inner { display: flex; align-items: center; gap: 1.5rem; padding: .7rem 0; }
.sitenav .brand { font-family: var(--mono); font-weight: 600; letter-spacing: -0.02em; font-size: 1rem; color: var(--ink); text-decoration: none; }
.sitenav .brand .dot { color: var(--accent); }
.sitenav .navlinks { display: flex; gap: 1.25rem; margin-left: auto; font-family: var(--mono); font-size: .8125rem; }
.sitenav .navlinks a { color: var(--muted); text-decoration: none; padding: .2rem 0; border-bottom: 1px solid transparent; }
.sitenav .navlinks a:hover { color: var(--ink); border-bottom-color: var(--accent); }
.sitenav .navlinks a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }

/* ---------- masthead ---------- */

.masthead { border-bottom: 1px solid var(--rule); background: var(--surface); }
.masthead-inner { padding: clamp(2.4rem, 6vw, 4rem) 0 clamp(2rem, 4vw, 3rem); display: grid; gap: 1.75rem; }

.wordmark { font-family: var(--mono); font-size: var(--step-4); font-weight: 600; letter-spacing: -0.035em; margin: 0; line-height: 1.05; }
.wordmark .dot { color: var(--accent); }

.tagline { margin: 0; max-width: var(--measure); font-size: var(--step-2); line-height: 1.45; color: var(--ink-soft); text-wrap: balance; }

.factbar { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; font-family: var(--mono); font-size: .8125rem; color: var(--muted); padding-top: .25rem; }
.factbar b { color: var(--ink-soft); font-weight: 600; }

.install { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem; font-family: var(--mono); font-size: .9375rem; background: var(--surface-alt); border: 1px solid var(--rule); border-radius: 3px; padding: .7rem 1rem; max-width: 34rem; }
.install .sigil { color: var(--accent); user-select: none; }

.pagehead { border-bottom: 1px solid var(--rule); background: var(--surface); }
.pagehead-inner { padding: clamp(2rem, 5vw, 3.25rem) 0 clamp(1.5rem, 3vw, 2.25rem); display: grid; gap: .9rem; }
.pagehead h1 { font-family: var(--mono); font-size: var(--step-3); font-weight: 600; letter-spacing: -0.025em; margin: 0; line-height: 1.15; }
.pagehead p { margin: 0; max-width: var(--measure); color: var(--ink-soft); font-size: var(--step-1); line-height: 1.5; }

/* ---------- terminal ---------- */

.terminal { background: var(--term-bg); border: 1px solid #262C35; border-radius: 4px; overflow: hidden; box-shadow: 0 1px 2px rgba(10,14,20,.14), 0 12px 32px -18px rgba(10,14,20,.5); }
.terminal-bar { display: flex; align-items: center; gap: .55rem; padding: .55rem .9rem; border-bottom: 1px solid #262C35; font-family: var(--mono); font-size: .75rem; color: var(--term-muted); letter-spacing: .04em; }
.terminal-bar .lamp { width: 9px; height: 9px; border-radius: 50%; background: #333B45; }
.terminal-bar .label { margin-left: auto; }
.terminal-bar .livelink { color: var(--term-accent); text-decoration: none; }
.terminal-bar .livelink:hover { text-decoration: underline; }
.terminal-bar .livelink + .label { margin-left: 0; }
/* The hero pairs the source pane with the session it produces — the same
   split the playground page uses, so the two pages rhyme. */
.hero-split { display: grid; gap: 1rem; grid-template-columns: 1fr; align-items: start; }
@media (min-width: 900px) { .hero-split { grid-template-columns: 1fr 1fr; } }
.terminal-body { overflow-x: auto; padding: 1.1rem 1.2rem 1.3rem; }
.terminal-body pre { margin: 0; font-family: var(--mono); font-size: .875rem; line-height: 1.6; color: var(--term-ink); white-space: pre; }
.terminal .p { color: var(--term-accent); }
.terminal .i { color: #FFFFFF; }
.terminal .o { color: var(--term-muted); }
/* the source pane is a single-theme dark surface, like the session */
.terminal.source .k { color: var(--term-accent); }
.terminal.source .c { color: var(--term-muted); }
.terminal.source .s { color: #A9BE7F; }
.caret { display: inline-block; width: .55em; height: 1.05em; background: var(--term-accent); vertical-align: -0.2em; animation: blink 1.15s steps(1) infinite; }
@keyframes blink { 0%, 55% { opacity: 1; } 56%, 100% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .caret { animation: none; } }

/* ---------- layout ---------- */

.columns { display: grid; grid-template-columns: 1fr; gap: 2.5rem; padding: clamp(2.2rem, 5vw, 3.5rem) 0 4rem; }
@media (min-width: 1000px) { .columns { grid-template-columns: 16rem minmax(0, 1fr); gap: 3.5rem; } }

.toc { display: none; }
@media (min-width: 1000px) { .toc { display: block; position: sticky; top: 4.2rem; align-self: start; max-height: calc(100vh - 6rem); overflow-y: auto; } }
.toc h2 { font-family: var(--mono); font-size: .6875rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin: 0 0 .85rem; font-weight: 600; }
.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: .1rem; }
.toc a { display: block; padding: .26rem 0 .26rem .8rem; border-left: 2px solid var(--rule); color: var(--muted); text-decoration: none; font-size: .8438rem; line-height: 1.4; }
.toc a:hover { color: var(--ink); border-left-color: var(--accent); }
.toc .sub a { padding-left: 1.6rem; font-size: .8125rem; }

main { min-width: 0; }

/* ---------- sections ---------- */

.section { padding-top: 2.75rem; scroll-margin-top: 4.5rem; }
.section + .section { margin-top: 2.75rem; border-top: 1px solid var(--rule); }
.section:first-child { padding-top: 0; }

.eyebrow { font-family: var(--mono); font-size: .6875rem; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); font-weight: 600; margin: 0 0 .5rem; }
.section h2 { font-family: var(--mono); font-weight: 600; letter-spacing: -0.02em; font-size: var(--step-3); line-height: 1.2; margin: 0 0 .9rem; text-wrap: balance; }
.section h3 { font-family: var(--mono); font-weight: 600; letter-spacing: -0.01em; font-size: var(--step-1); line-height: 1.3; margin: 2.2rem 0 .7rem; scroll-margin-top: 4.5rem; }
.section h4 { font-family: var(--mono); font-weight: 600; font-size: 1rem; line-height: 1.35; margin: 1.8rem 0 .6rem; color: var(--ink-soft); scroll-margin-top: 4.5rem; }
.section p, .section li { max-width: var(--measure); color: var(--ink-soft); }
.section p { margin: 0 0 1rem; }
.section ul { margin: 0 0 1.15rem; padding-left: 1.15rem; display: grid; gap: .4rem; }
.section strong { color: var(--ink); }

code { font-family: var(--mono); font-size: .9em; background: var(--surface-alt); border: 1px solid var(--rule); border-radius: 3px; padding: .08em .34em; }
a code { color: inherit; }

pre.code { margin: 0 0 1.25rem; background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 1rem 1.1rem; overflow-x: auto; font-family: var(--mono); font-size: .8438rem; line-height: 1.62; color: var(--ink); }
pre.code code { background: none; border: 0; padding: 0; font-size: inherit; }
pre.code .c { color: var(--muted); }
pre.code .k { color: var(--accent-ink); }
pre.code .s { color: var(--accent); }

.out { margin: 0 0 1.25rem; background: var(--term-bg); border: 1px solid #262C35; border-radius: 4px; padding: .95rem 1.1rem; overflow-x: auto; font-family: var(--mono); font-size: .8438rem; line-height: 1.6; color: var(--term-ink); }
.out .p { color: var(--term-accent); }
.out .i { color: #FFFFFF; }
.outlabel { font-family: var(--mono); font-size: .6875rem; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin: 0 0 .4rem; }

.filename { font-family: var(--mono); font-size: .75rem; letter-spacing: .04em; color: var(--muted); margin: 0 0 .4rem; }

.callout { border: 1px solid var(--rule-strong); border-left: 3px solid var(--accent); background: var(--accent-wash); border-radius: 3px; padding: .95rem 1.1rem; margin: 0 0 1.35rem; max-width: var(--measure); }
.callout p { margin: 0; color: var(--ink-soft); font-size: .9375rem; }
.callout p + p { margin-top: .55rem; }
.callout .tag { display: block; font-family: var(--mono); font-size: .6875rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); font-weight: 600; margin-bottom: .35rem; }

.note { border: 1px solid var(--rule); border-left: 3px solid var(--rule-strong); background: var(--surface); border-radius: 3px; padding: .85rem 1.1rem; margin: 0 0 1.35rem; max-width: var(--measure); }
.note p { margin: 0; color: var(--muted); font-size: .9063rem; }

.maplist { display: grid; gap: 0; margin: 0 0 1.35rem; border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; background: var(--surface); }
.maprow { display: grid; grid-template-columns: 1fr auto 1fr; gap: .9rem; align-items: center; padding: .6rem .9rem; border-bottom: 1px solid var(--rule); font-family: var(--mono); font-size: .8438rem; }
.maprow:last-child { border-bottom: 0; }
.maprow .arrow { color: var(--accent); }
.maprow .to { color: var(--ink); }
.maprow .from { color: var(--muted); }

.notelist { margin: 0 0 1.35rem; border-top: 1px solid var(--rule); }
.noterow { display: grid; grid-template-columns: 1fr; gap: .25rem 1.2rem; padding: .8rem 0; border-bottom: 1px solid var(--rule); font-size: .875rem; }
@media (min-width: 640px) { .noterow { grid-template-columns: 11rem minmax(0, 1fr); } }
.noterow .term { font-family: var(--mono); font-weight: 600; color: var(--ink); }
.noterow .desc { color: var(--ink-soft); }

.memberlist { margin: 0 0 1.35rem; border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; background: var(--surface); }
.member { padding: .8rem .95rem; border-bottom: 1px solid var(--rule); }
.member:last-child { border-bottom: 0; }
.member h5 { margin: 0 0 .35rem; font-family: var(--mono); font-size: .875rem; font-weight: 600; color: var(--ink); }
.member ul { margin: 0; padding-left: 1.1rem; display: grid; gap: .25rem; }
.member li { font-size: .875rem; color: var(--ink-soft); }

.cardgrid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); margin: 0 0 1.5rem; }
.card { background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 1rem 1.1rem; }
.card h3 { font-family: var(--mono); font-size: .9375rem; font-weight: 600; margin: 0 0 .4rem; letter-spacing: -0.01em; }
.card p { margin: 0; font-size: .875rem; color: var(--muted); max-width: none; }
.cardgrid.design { grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr)); margin-top: 1.5rem; }
.cardgrid.design .card p { color: var(--ink-soft); line-height: 1.6; }

.bignav { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); margin: 1.5rem 0 0; }
.bignav a { display: block; background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 1.1rem 1.2rem; text-decoration: none; }
.bignav a:hover { border-color: var(--accent); }
.bignav .label { font-family: var(--mono); font-size: .6875rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); font-weight: 600; display: block; margin-bottom: .3rem; }
.bignav .title { font-family: var(--mono); font-size: 1.0625rem; font-weight: 600; color: var(--ink); display: block; margin-bottom: .3rem; letter-spacing: -0.015em; }
.bignav .blurb { font-size: .875rem; color: var(--muted); display: block; }

/* ---------- footer ---------- */

.footer { border-top: 1px solid var(--rule); background: var(--surface); }
.footer-inner { padding: 2.25rem 0 3rem; display: grid; gap: .6rem; }
.footer p { margin: 0; font-size: .875rem; color: var(--muted); max-width: var(--measure); }
.footer .links { display: flex; flex-wrap: wrap; gap: 1.25rem; font-family: var(--mono); font-size: .8125rem; margin-bottom: .35rem; }