/* ------------------------------------------------------------------
   Design tokens — light palette on :root, dark overrides below.
   Cool-biased neutrals, graph-green accent, amber for highlights.
------------------------------------------------------------------ */
:root {
  --bg: #f5f7f8;
  --bg-elev: #ffffff;
  --bg-sunk: #eceff2;
  --ink: #16212b;
  --ink-2: #44525f;
  --ink-3: #74828f;
  --line: #d6dce2;
  --line-strong: #b9c2cb;
  --accent: #1f6f63;
  --accent-ink: #ffffff;
  --accent-soft: #dcefe9;
  --amber: #b86e12;
  --amber-soft: #f7e9d2;
  --danger: #a93a3a;
  --shadow: 0 1px 2px rgba(22, 33, 43, .06), 0 8px 24px rgba(22, 33, 43, .06);
  --radius: 6px;
  --font-display: "Newsreader", Georgia, "Times New Roman", serif;
  --font-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --max: 1120px;
  --measure: 66ch;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #11181f; --bg-elev: #18222b; --bg-sunk: #0c1217;
    --ink: #e8edf1; --ink-2: #b7c2cc; --ink-3: #8795a2;
    --line: #2a3640; --line-strong: #3b4955;
    --accent: #5fc2ae; --accent-ink: #0c1a17; --accent-soft: #173530;
    --amber: #e6a650; --amber-soft: #3a2a12; --danger: #e07b7b;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #11181f; --bg-elev: #18222b; --bg-sunk: #0c1217;
  --ink: #e8edf1; --ink-2: #b7c2cc; --ink-3: #8795a2;
  --line: #2a3640; --line-strong: #3b4955;
  --accent: #5fc2ae; --accent-ink: #0c1a17; --accent-soft: #173530;
  --amber: #e6a650; --amber-soft: #3a2a12; --danger: #e07b7b;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
  color-scheme: dark;
}

/* ------------------------------------------------------------------ base */
* { box-sizing: border-box; }
html { height: 100%; }
body {
  margin: 0; min-height: 100%;
  background: var(--bg); color: var(--ink);
  font-family: var(--font-body); font-size: 16px; line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }
img, svg { max-width: 100%; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 500; line-height: 1.15; margin: 0 0 .4em; text-wrap: balance; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; max-width: var(--measure); }
small, .muted { color: var(--ink-3); }
code, .mono { font-family: var(--font-mono); font-size: .9em; }
.eyebrow { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); margin-bottom: .6rem; }
.skip { position: absolute; left: -999px; top: 0; background: var(--amber); color: #111; padding: .5rem 1rem; z-index: 100; }
.skip:focus { left: 1rem; top: 1rem; }
.wrap { max-width: var(--max); margin: 0 auto; padding-inline: 20px; }
.hidden-visually { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ------------------------------------------------------------------ header */
.site-header { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; gap: 1.25rem; min-height: 60px; }
.brand { display: flex; align-items: center; gap: .6rem; color: var(--ink); font-family: var(--font-display); font-size: 1.15rem; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 26px; height: 26px; }
.nav { display: flex; gap: .2rem; margin-left: auto; flex-wrap: wrap; }
.nav a { color: var(--ink-2); padding: .4rem .6rem; border-radius: var(--radius); font-size: .95rem; }
.nav a:hover { background: var(--bg-sunk); text-decoration: none; color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); background: var(--accent-soft); }
.icon-btn { border: 1px solid var(--line); background: var(--bg-elev); color: var(--ink-2); width: 36px; height: 36px; border-radius: var(--radius); display: inline-grid; place-items: center; cursor: pointer; }
.icon-btn:hover { color: var(--ink); border-color: var(--line-strong); }
.nav-toggle { display: none; }
@media (max-width: 760px) {
  .nav-toggle { display: inline-grid; margin-left: auto; }
  .nav { display: none; width: 100%; flex-direction: column; padding-bottom: .6rem; }
  .nav.open { display: flex; }
  .site-header .wrap { flex-wrap: wrap; }
  .theme-btn { margin-left: 0; }
}

/* ------------------------------------------------------------------ hero */
.hero { padding-block: clamp(2.5rem, 7vw, 5rem) 2rem; display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 2.5rem; align-items: center; }
.hero p.lead { font-size: 1.2rem; color: var(--ink-2); }
.hero-figure img { display: block; width: 100%; height: auto; }
.hero-figure { border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-elev); box-shadow: var(--shadow); overflow: hidden; }
.hero-figure figcaption { font-size: .8rem; color: var(--ink-3); padding: .5rem .8rem; border-top: 1px solid var(--line); font-family: var(--font-mono); }
@media (max-width: 820px) { .hero { grid-template-columns: 1fr; } }
.btn { display: inline-flex; align-items: center; gap: .4rem; padding: .55rem .95rem; border-radius: var(--radius); border: 1px solid var(--line-strong); background: var(--bg-elev); color: var(--ink); font-size: .95rem; cursor: pointer; font-family: inherit; }
.btn:hover { text-decoration: none; border-color: var(--ink-3); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.05); }
.btn-row { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.2rem; }

/* ------------------------------------------------------------------ sections & cards */
.section { padding-block: 2.5rem; border-top: 1px solid var(--line); }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-bottom: 1.2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.tile { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.2rem; display: flex; flex-direction: column; gap: .4rem; }
.tile h3 { margin: 0; }
.tile .num { font-family: var(--font-mono); font-size: 1.9rem; line-height: 1; font-variant-numeric: tabular-nums; color: var(--accent); }
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .8rem; margin-block: 1rem 2rem; }
.stat { border-left: 3px solid var(--accent); padding: .2rem 0 .2rem .9rem; }
.stat .num { font-family: var(--font-mono); font-size: 1.6rem; font-variant-numeric: tabular-nums; }
.stat .lbl { font-size: .85rem; color: var(--ink-3); }

/* ------------------------------------------------------------------ ledger / tables */
.ledger { width: 100%; border-collapse: collapse; font-size: .93rem; }
.ledger th, .ledger td { text-align: left; padding: .6rem .6rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.ledger th { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; }
.ledger td.date { font-family: var(--font-mono); white-space: nowrap; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.table-scroll { overflow-x: auto; }
.pill { display: inline-block; font-family: var(--font-mono); font-size: .7rem; letter-spacing: .06em; padding: .15rem .5rem; border-radius: 999px; border: 1px solid var(--line-strong); color: var(--ink-2); white-space: nowrap; }
.pill.ok { background: var(--accent-soft); border-color: transparent; color: var(--accent); }
.pill.soon { background: var(--amber-soft); border-color: transparent; color: var(--amber); }
.exid { font-family: var(--font-mono); font-size: .78rem; color: var(--ink-3); }
.note { background: var(--bg-sunk); border-left: 3px solid var(--amber); padding: .8rem 1rem; border-radius: 0 var(--radius) var(--radius) 0; font-size: .93rem; }
.note p:last-child { margin-bottom: 0; }

/* ------------------------------------------------------------------ gallery */
.toolbar { position: sticky; top: calc(60px + env(safe-area-inset-top, 0px)); z-index: 10; background: var(--bg); padding-block: .8rem; border-bottom: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; }
.toolbar label { font-size: .8rem; color: var(--ink-3); display: flex; flex-direction: column; gap: .2rem; }
.toolbar select, .toolbar input[type="search"] { font: inherit; font-size: .9rem; padding: .4rem .55rem; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--bg-elev); color: var(--ink); min-width: 140px; }
.toolbar input[type="search"] { min-width: 200px; }
.seg { display: inline-flex; border: 1px solid var(--line-strong); border-radius: var(--radius); overflow: hidden; }
.seg button { border: 0; background: var(--bg-elev); color: var(--ink-2); padding: .4rem .7rem; cursor: pointer; font: inherit; font-size: .85rem; }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.toolbar .spacer { flex: 1; }
.count { font-family: var(--font-mono); font-size: .8rem; color: var(--ink-3); }

.gallery-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 2rem; padding-block: 1.5rem; }
@media (max-width: 900px) { .gallery-layout { grid-template-columns: 1fr; } .toc { display: none; } }
.toc { position: sticky; top: calc(130px + env(safe-area-inset-top, 0px)); align-self: start; max-height: calc(100vh - 150px); overflow: auto; font-size: .88rem; }
.toc h4 { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: .5rem; }
.toc ol { list-style: none; padding: 0; margin: 0; }
.toc li a { display: block; padding: .2rem .4rem; color: var(--ink-2); border-left: 2px solid transparent; }
.toc li a:hover { border-left-color: var(--accent); color: var(--ink); text-decoration: none; }

.cards { display: grid; gap: 1.2rem; }
.card { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); display: grid; grid-template-columns: 300px minmax(0, 1fr); overflow: hidden; scroll-margin-top: 140px; }
.card.compact { grid-template-columns: 150px minmax(0, 1fr); }
.card figure { margin: 0; background: var(--bg-sunk); border-right: 1px solid var(--line); display: grid; place-items: start center; padding: 1rem .8rem; }
.card figure svg, .card figure img { width: 100%; height: auto; }
.card .body { padding: 1rem 1.2rem; display: flex; flex-direction: column; gap: .6rem; min-width: 0; }
.card-head { display: flex; align-items: baseline; gap: .6rem; flex-wrap: wrap; }
.card-head h3 { margin: 0; font-size: 1.3rem; }
.card-head .by { color: var(--ink-3); font-size: .9rem; }
.card-head .params { font-family: var(--font-mono); font-size: .8rem; color: var(--accent); }
.links { display: flex; flex-wrap: wrap; gap: .3rem .9rem; font-size: .85rem; }
.summary { margin: 0; max-width: none; }
.facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .35rem 1rem; margin: 0; font-size: .85rem; }
.facts div { display: flex; flex-direction: column; border-top: 1px solid var(--line); padding-top: .3rem; }
.facts dt { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.facts dd { margin: 0; }
.keydetail { font-size: .9rem; border-left: 3px solid var(--amber); padding-left: .7rem; color: var(--ink-2); }
.concepts { display: flex; flex-wrap: wrap; gap: .3rem; }
.concepts span { font-family: var(--font-mono); font-size: .72rem; padding: .15rem .45rem; background: var(--bg-sunk); border-radius: 4px; color: var(--ink-2); }
.card details summary { cursor: pointer; font-size: .88rem; color: var(--accent); }
.card details p { font-size: .9rem; max-width: none; }
.card .actions { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: auto; }
.card .actions button { font: inherit; font-size: .78rem; padding: .3rem .6rem; border: 1px solid var(--line-strong); background: var(--bg-elev); color: var(--ink-2); border-radius: var(--radius); cursor: pointer; }
.card .actions button:hover { border-color: var(--accent); color: var(--accent); }
.card.compact .facts, .card.compact .keydetail, .card.compact details, .card.compact .concepts, .card.compact .links { display: none; }
.card.compact .body { padding: .7rem .9rem; }
.card.compact .card-head h3 { font-size: 1.05rem; }
.sample-flag { font-family: var(--font-mono); font-size: .68rem; color: var(--amber); letter-spacing: .08em; text-transform: uppercase; }
@media (max-width: 640px) { .card, .card.compact { grid-template-columns: 1fr; } .card figure { border-right: 0; border-bottom: 1px solid var(--line); } }

/* compare */
.compare { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.2rem; margin-block: 1rem; }
.compare-controls { display: flex; flex-wrap: wrap; gap: .6rem; align-items: end; }
.compare table { width: 100%; border-collapse: collapse; font-size: .88rem; margin-top: .8rem; }
.compare th, .compare td { text-align: left; padding: .45rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.compare th { font-family: var(--font-mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; }
.compare tr.diff td { background: var(--amber-soft); }
.empty { color: var(--ink-3); font-size: .9rem; padding: 1rem 0; }

/* ------------------------------------------------------------------ prose pages */
.prose { max-width: var(--measure); }
.prose ul { padding-left: 1.2rem; }
.two-col { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); gap: 2.5rem; padding-block: 2rem; }
@media (max-width: 820px) { .two-col { grid-template-columns: 1fr; } }
.aside-box { background: var(--bg-elev); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.2rem; font-size: .92rem; }
.aside-box h4 { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: .5rem; }
.avatar { width: 100%; max-width: 260px; aspect-ratio: 1; border-radius: var(--radius); border: 1px solid var(--line); background: var(--bg-sunk); display: grid; place-items: center; color: var(--ink-3); font-family: var(--font-mono); font-size: .8rem; }
.timeline { list-style: none; padding: 0; margin: 0; border-left: 2px solid var(--line); }
.timeline li { padding: .2rem 0 1rem 1.2rem; position: relative; }
.timeline li::before { content: ""; position: absolute; left: -7px; top: .55rem; width: 12px; height: 12px; border-radius: 50%; background: var(--bg); border: 2px solid var(--accent); }
.timeline .when { font-family: var(--font-mono); font-size: .78rem; color: var(--ink-3); }
.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li { display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 1rem; padding: .8rem 0; border-bottom: 1px solid var(--line); }
.post-list .when { font-family: var(--font-mono); font-size: .8rem; color: var(--ink-3); padding-top: .2rem; }
@media (max-width: 520px) { .post-list li { grid-template-columns: 1fr; gap: .2rem; } }

/* ------------------------------------------------------------------ footer */
.site-footer { border-top: 1px solid var(--line); margin-top: 3rem; padding-block: 2rem 3rem; font-size: .88rem; color: var(--ink-3); }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 1rem 2rem; justify-content: space-between; }
.site-footer a { color: var(--ink-2); }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }