:root {
  --fg: #1a1a1a;
  --fg-muted: #5c6370;
  --fg-subtle: #8b919b;
  --bg: #ffffff;
  --bg-soft: #f7f8fa;
  --border: #e3e6ea;
  --border-strong: #c9cdd4;
  --accent: #2b5f8a;
  --accent-soft: #eaf1f7;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --maxw: 860px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  color: var(--fg);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- header / nav ---------- */
header.site {
  border-bottom: 1px solid var(--border);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}
header.site .wrap {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--fg);
  font-weight: 650;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  flex-shrink: 0;
}
.brand img { height: 30px; width: auto; }

nav.site { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
nav.site a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 6px 10px;
  border-radius: 5px;
  white-space: nowrap;
}
nav.site a:hover { color: var(--fg); background: var(--bg-soft); }
nav.site a.active { color: var(--fg); font-weight: 600; }

/* ---------- hero (home) ---------- */
.hero { text-align: center; padding: 64px 0 40px; }
.hero img { height: 128px; width: auto; margin-bottom: 20px; }
.hero h1 {
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.hero .tagline { color: var(--fg-muted); font-size: 1.12rem; max-width: 620px; margin: 0 auto; }
.hero .badges { margin-top: 20px; display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.badge {
  font-size: 0.8rem;
  font-family: var(--mono);
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid #d3e2ee;
  border-radius: 20px;
  padding: 3px 12px;
}

/* ---------- page header (subpages) ---------- */
.pagehead { padding: 44px 0 8px; }
.pagehead h1 { font-size: 1.85rem; font-weight: 700; letter-spacing: -0.02em; }
.pagehead p.lede { color: var(--fg-muted); font-size: 1.05rem; margin-top: 8px; }

/* ---------- content ---------- */
main { padding-bottom: 72px; }
section { padding: 28px 0; }
section + section { border-top: 1px solid var(--border); }

h2 {
  font-size: 1.3rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}
h3 {
  font-size: 1.02rem;
  font-weight: 650;
  margin: 22px 0 8px;
}
p { margin-bottom: 14px; }
p:last-child { margin-bottom: 0; }

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

ul, ol { margin: 0 0 14px 22px; }
li { margin-bottom: 6px; }

strong { font-weight: 650; }

code {
  font-family: var(--mono);
  font-size: 0.87em;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
}

pre {
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 1.55;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 14px 16px;
  overflow-x: auto;
  margin-bottom: 14px;
}
pre code { background: none; border: none; padding: 0; font-size: inherit; }
pre .c { color: var(--fg-subtle); }
pre .k { color: #8250a8; }
pre .s { color: #1a7f5a; }

blockquote {
  border-left: 3px solid var(--border-strong);
  padding-left: 16px;
  color: var(--fg-muted);
  margin-bottom: 14px;
}

/* ---------- tables ---------- */
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; margin-bottom: 14px; }
th {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 2px solid var(--border-strong);
  font-weight: 650;
  white-space: nowrap;
}
td { padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
td code { white-space: nowrap; }
tr:last-child td { border-bottom: none; }

/* ---------- cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 12px;
}
.cards a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  color: var(--fg);
  transition: border-color .15s, box-shadow .15s;
}
.cards a:hover {
  border-color: var(--border-strong);
  box-shadow: 0 1px 6px rgba(20,30,50,.06);
  text-decoration: none;
}
.cards .t { font-weight: 650; display: block; margin-bottom: 3px; font-size: 0.97rem; }
.cards .d { color: var(--fg-muted); font-size: 0.87rem; line-height: 1.45; }

/* ---------- steps ---------- */
.step { margin-bottom: 26px; }
.step-n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--fg);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 650;
  margin-right: 8px;
  vertical-align: 2px;
}

/* ---------- callout ---------- */
.note {
  background: var(--accent-soft);
  border: 1px solid #d3e2ee;
  border-radius: 7px;
  padding: 13px 16px;
  font-size: 0.93rem;
  margin-bottom: 14px;
}
.note strong { color: var(--accent); }

/* ---------- talks ---------- */
.talk {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}
.talk:last-child { border-bottom: none; }
.talk img { width: 168px; border-radius: 6px; border: 1px solid var(--border); flex-shrink: 0; }
.talk .meta { flex: 1; min-width: 0; }
.talk .title { font-weight: 650; display: block; margin-bottom: 4px; }
.talk .who { color: var(--fg-muted); font-size: 0.89rem; }

/* ---------- status ---------- */
.status {
  display: inline-block;
  font-size: 0.74rem;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: .04em;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.status.shipped { background: #e4f2ea; color: #1a6b45; }
.status.progress { background: #fdf1dc; color: #8a5a12; }
.status.planned { background: var(--bg-soft); color: var(--fg-muted); border: 1px solid var(--border); }

/* ---------- footer ---------- */
footer.site {
  border-top: 1px solid var(--border);
  padding: 24px 0 40px;
  font-size: 0.87rem;
  color: var(--fg-subtle);
}
footer.site .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer.site a { color: var(--fg-muted); }

/* ---------- responsive ---------- */
@media (max-width: 700px) {
  header.site .wrap { height: auto; padding-top: 12px; padding-bottom: 12px; flex-wrap: wrap; }
  nav.site { margin-left: 0; width: 100%; }
  .hero { padding: 40px 0 28px; }
  .hero h1 { font-size: 1.7rem; }
  .hero img { height: 100px; }
  .talk { flex-direction: column; }
  .talk img { width: 100%; max-width: 320px; }
  table { font-size: 0.86rem; }
  th, td { padding: 7px 8px; }
}

/* ---------- dark ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6e9ee;
    --fg-muted: #a2aab6;
    --fg-subtle: #7a828e;
    --bg: #13161a;
    --bg-soft: #1b1f25;
    --border: #2a2f37;
    --border-strong: #3d434d;
    --accent: #7db3dd;
    --accent-soft: #17242e;
  }
  header.site { background: var(--bg); }
  .badge { border-color: #244055; }
  .note { border-color: #244055; }
  .cards a:hover { box-shadow: 0 1px 6px rgba(0,0,0,.4); }
  .step-n { background: #e6e9ee; color: #13161a; }
  .status.shipped { background: #16301f; color: #6cc38f; }
  .status.progress { background: #322612; color: #d8a03f; }
  pre .k { color: #c792ea; }
  pre .s { color: #6cc38f; }
  .talk img { filter: brightness(.92); }
}