/* Design tokens shared with the Rust stack guides (tensor4all-meta/site/stack/assets/style.css). */
:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --surface-2: #f2f0ea;
  --text: #1d2126;
  --muted: #5b636d;
  --line: #dcd8cf;
  --accent: #1f5fa8;
  --accent-soft: #e4eefa;
  --warm: #a3521a;
  --warm-soft: #fbeadb;
  --ok: #2d7a46;
  --ok-soft: #e1f2e6;
  --warn: #8a6a00;
  --warn-soft: #fbf1cc;
  --code-bg: #f3f1ec;
  --new: #d1242f;
  --shadow: 0 1px 2px rgba(20, 24, 30, 0.06), 0 4px 16px rgba(20, 24, 30, 0.05);
  --radius: 10px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Hiragino Sans", "Noto Sans CJK JP", "PingFang SC", sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171b; --surface: #1b1f24; --surface-2: #22272e; --text: #e6e8eb; --muted: #9aa3ad;
    --line: #333a43; --accent: #79b0ee; --accent-soft: #1d2c3e; --warm: #f0a46b; --warm-soft: #3a2719;
    --ok: #7cc893; --ok-soft: #1c3124; --warn: #e5c25a; --warn-soft: #362d10; --code-bg: #1f242a; --new: #f85149;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14171b; --surface: #1b1f24; --surface-2: #22272e; --text: #e6e8eb; --muted: #9aa3ad;
  --line: #333a43; --accent: #79b0ee; --accent-soft: #1d2c3e; --warm: #f0a46b; --warm-soft: #3a2719;
  --ok: #7cc893; --ok-soft: #1c3124; --warn: #e5c25a; --warn-soft: #362d10; --code-bg: #1f242a; --new: #f85149;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3); color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 var(--sans); }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; height: auto; }

/* top bar */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar .inner { max-width: 1080px; margin: 0 auto; padding: 10px 16px; display: flex; gap: 22px; align-items: center; flex-wrap: wrap; }
.topbar .brand { font-weight: 700; color: var(--text); text-decoration: none; letter-spacing: -0.01em; font-size: 17px; }
.topbar nav { display: flex; gap: 16px; flex-wrap: wrap; font-size: 15px; }
.topbar nav a, .topbar .gh { color: var(--muted); text-decoration: none; }
.topbar nav a[aria-current="page"] { color: var(--text); font-weight: 600; }
.topbar nav a:hover, .topbar .gh:hover { color: var(--text); }
.topbar .gh { margin-left: auto; font-size: 15px; }
@media (max-width: 640px) {
  .topbar { position: static; }
  .topbar .inner { gap: 6px 16px; }
  .topbar nav { gap: 4px 14px; }
  .topbar .gh { margin-left: 0; }
}

/* page frame */
.layout { max-width: 1080px; margin: 0 auto; padding: 0 16px 64px; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
main { min-width: 0; }

h1 { font-size: clamp(30px, 5vw, 44px); line-height: 1.12; letter-spacing: -0.02em; margin: 0 0 14px; }
h2 { font-size: 26px; line-height: 1.25; letter-spacing: -0.01em; margin: 48px 0 12px; scroll-margin-top: 70px; }
h3 { font-size: 19px; margin: 28px 0 8px; scroll-margin-top: 70px; }
p, ul, ol { max-width: 46em; }
li { margin: 4px 0; }
code { font-family: var(--mono); font-size: 0.88em; background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
pre, .highlight pre {
  background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px; overflow-x: auto; font-size: 14px; line-height: 1.55; max-width: 100%;
}
pre code { background: none; padding: 0; font-size: inherit; }
blockquote { margin: 18px 0; padding: 10px 16px; border-left: 3px solid var(--line); color: var(--muted); max-width: 46em; }
blockquote p { margin: 0; }
hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }

/* markdown pages */
.prose { padding-top: 40px; }
.prose > h1:first-child { margin-top: 0; }
.prose table { border-collapse: collapse; width: 100%; font-size: 15px; display: block; overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.prose th, .prose td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { background: var(--surface-2); font-weight: 600; font-size: 14px; }
.prose tr:last-child td { border-bottom: none; }
#markdown-toc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px 12px 36px; font-size: 15px; }
#markdown-toc ul { padding-left: 20px; }

/* home */
.hero { padding: 64px 0 24px; }
.eyebrow { font-size: 13px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--warm); font-weight: 600; margin: 0 0 10px; }
.hero h1 { max-width: 18em; }
.lead { font-size: 19px; color: var(--muted); max-width: 42em; margin: 0 0 22px; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 0 0 8px; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 8px; font-weight: 600; text-decoration: none;
  border: 1px solid var(--accent); color: var(--accent); background: var(--surface);
}
.btn.primary { background: var(--accent); color: var(--bg); }
.btn:hover { text-decoration: none; filter: brightness(1.06); }
.stats { display: flex; gap: 28px; flex-wrap: wrap; margin: 26px 0 0; padding: 0; list-style: none; max-width: none; color: var(--muted); font-size: 15px; }
.stats li { margin: 0; }
.stats strong { display: block; color: var(--text); font-size: 22px; letter-spacing: -0.01em; }

.section { padding: 8px 0 8px; }
.section > h2 { margin-top: 56px; }
.section-lead { color: var(--muted); margin-top: 0; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin: 20px 0; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px 22px; display: flex; flex-direction: column; min-width: 0;
}
.card h3 { margin: 0 0 6px; }
.card p { margin: 0 0 12px; color: var(--muted); font-size: 15px; }
.card ul { padding-left: 18px; margin: 0 0 12px; font-size: 15px; }
.card .go { margin-top: auto; font-weight: 600; text-decoration: none; }
.card.feature { border-color: color-mix(in srgb, var(--warm) 45%, var(--line)); }
.tag { display: inline-block; font-size: 12px; font-weight: 600; padding: 2px 8px; border-radius: 999px; margin-bottom: 10px; width: fit-content; }
.tag.user { background: var(--accent-soft); color: var(--accent); }
.tag.backend { background: var(--warm-soft); color: var(--warm); }
.tag.ok { background: var(--ok-soft); color: var(--ok); }

.split { display: grid; grid-template-columns: minmax(0, 1fr); gap: 24px; align-items: start; }
@media (min-width: 900px) { .split { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); } }

.figure { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; margin: 0; }
.figure figcaption { font-size: 14px; color: var(--muted); margin-top: 8px; }
.map-scroll { overflow-x: auto; }
.map-scroll svg { display: block; width: 100%; height: auto; min-width: 560px; }

.pill { display: inline-block; font-size: 12px; font-weight: 600; padding: 1px 8px; border-radius: 999px; white-space: nowrap; }
.pill.ok { background: var(--ok-soft); color: var(--ok); }
.pill.wip { background: var(--warn-soft); color: var(--warn); }
.pill.dev { background: var(--accent-soft); color: var(--accent); }
.pill.talk { background: var(--warm-soft); color: var(--warm); }

.note { border-left: 3px solid var(--accent); background: var(--accent-soft); padding: 12px 16px; border-radius: 0 var(--radius) var(--radius) 0; margin: 18px 0; max-width: 46em; }
.note p { margin: 0; }
.note p + p { margin-top: 8px; }

/* matrix rooms */
.rooms { list-style: none; padding: 0; margin: 12px 0; display: grid; gap: 8px; max-width: 46em; }
.rooms li { display: grid; grid-template-columns: 9.5em minmax(0, 1fr); gap: 12px; margin: 0; align-items: baseline; }
.rooms code { justify-self: start; }
.rooms span { color: var(--muted); font-size: 15px; }
@media (max-width: 520px) { .rooms li { grid-template-columns: minmax(0, 1fr); gap: 0; } }

/* meetings */
.meetings { list-style: none; padding: 0; margin: 12px 0; max-width: 52em; }
.meeting { display: grid; grid-template-columns: 8.5em minmax(0, 1fr); gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); margin: 0; }
.meeting:last-child { border-bottom: none; }
.meeting time { color: var(--muted); font-variant-numeric: tabular-nums; font-size: 15px; }
.meeting .pill { margin-right: 6px; }
.meeting .mtime, .meeting .mnote, .meeting .mlinks { display: block; font-size: 14px; color: var(--muted); }
.meeting .mtime { color: var(--text); font-weight: 600; }
.meeting.upcoming { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow); }
@media (max-width: 520px) { .meeting { grid-template-columns: minmax(0, 1fr); gap: 2px; } }
details.past summary { cursor: pointer; color: var(--accent); font-weight: 600; margin: 12px 0; }

.paper { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 20px; max-width: 52em; }
.paper .ptitle { font-weight: 600; display: block; margin-bottom: 4px; }
.paper .pauth { color: var(--muted); font-size: 15px; display: block; }

/* footer */
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; margin-top: 48px; }
footer .inner { max-width: 1080px; margin: 0 auto; padding: 24px 16px 40px; }
.foot-cols { display: flex; gap: 24px; justify-content: space-between; flex-wrap: wrap; }
.foot-cols > div { max-width: 32em; }
.foot-cols strong { color: var(--text); }

/* stack map (drawn by tensor4all-meta/site/stack/assets/stack-map.js) */
.sm-band { fill: var(--surface-2); stroke: var(--line); }
.sm-band.user { fill: var(--accent-soft); }
.sm-band.backend { fill: var(--warm-soft); }
.sm-label { fill: var(--text); font: 700 14px var(--sans); }
.sm-sub { fill: var(--muted); font: 12px var(--sans); }
.sm-box { fill: var(--surface); stroke: var(--line); }
.sm-link:hover .sm-box { stroke: var(--accent); stroke-width: 2; }
.sm-title { fill: var(--text); font: 600 13.5px var(--sans); }
.sm-desc { fill: var(--muted); font: 11.5px var(--sans); }
.sm-arrow { stroke: var(--muted); stroke-width: 1.4; fill: none; }
.sm-head { fill: var(--muted); }
.sm-side { fill: var(--ok-soft); stroke: var(--ok); stroke-dasharray: 4 3; }
.sm-sidetitle { fill: var(--ok); font: 700 14px var(--sans); }
.sm-dim { opacity: 0.38; }

/* "New" badge */
.new {
  display: inline-block; vertical-align: middle; margin-left: 4px;
  font: 700 10px/1 var(--sans); letter-spacing: 0.06em; text-transform: uppercase;
  color: #fff; background: var(--new); padding: 3px 6px 2px; border-radius: 999px;
  position: relative; top: -1px;
}
h2 .new { font-size: 12px; padding: 4px 8px 3px; margin-left: 8px; top: -3px; }

/* software page */
.chooser { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; margin: 24px 0 8px; }
.choice {
  display: flex; flex-direction: column; gap: 6px; text-decoration: none; color: var(--text);
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow);
}
.choice:hover { border-color: var(--accent); }
.choice .q { font-weight: 600; line-height: 1.35; }
.choice .a { color: var(--accent); font-size: 14px; }
.choice .a::before { content: "\2192\00a0"; }
.lib { display: grid; grid-template-columns: minmax(0, 1fr); gap: 8px 28px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px 22px; margin: 12px 0 8px; }
.lib p { margin: 0 0 10px; }
.lib p:last-child { margin-bottom: 0; }
.facts { list-style: none; padding: 0; margin: 0; font-size: 15px; }
.facts li { margin: 0 0 6px; }
@media (min-width: 820px) { .lib { grid-template-columns: minmax(0, 1fr) 13em; } .facts { border-left: 1px solid var(--line); padding-left: 20px; } }
.card .pill { margin-top: auto; width: fit-content; }
.small { font-size: 14px; color: var(--muted); }
.prose > .eyebrow + h1 { margin-top: 0; }