/* Yen Wang: site styles. One file, no build step. Fonts are self-hosted (SIL OFL).
   Look: monochrome, near-black by default, square edges, hairline grids, one cold accent. */

@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/IBMPlexSans-Regular.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/IBMPlexSans-Medium.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 600; font-display: swap; src: url("../fonts/IBMPlexSans-SemiBold.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/IBMPlexMono-Regular.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/IBMPlexMono-Medium.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 600; font-display: swap; src: url("../fonts/IBMPlexMono-SemiBold.woff2") format("woff2"); }

/* Dark is the default. Light is opt-in through the toggle. */
:root {
  color-scheme: dark;
  --bg: #08090b;
  --bg-raised: #0f1114;
  --bg-hover: #15181c;
  --ink: #f2f3f5;
  --ink-soft: #a7abb3;
  --ink-faint: #6c717b;
  --rule: #23262c;
  --rule-strong: #3a3f47;
  --accent: #4c90f0;          /* Blueprint blue, used sparingly */
  --accent-ink: #8abbff;
  --code-bg: #0f1114;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --measure: 44rem;
  --wide: 72rem;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #ffffff;
  --bg-raised: #f6f7f9;
  --bg-hover: #eef0f3;
  --ink: #0b0c0e;
  --ink-soft: #4a4f57;
  --ink-faint: #7a7f88;
  --rule: #e3e5e9;
  --rule-strong: #c5c9d0;
  --accent: #2d72d2;
  --accent-ink: #215db0;
  --code-bg: #f6f7f9;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.65 var(--sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration-color: var(--rule-strong); text-underline-offset: 4px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent-ink); text-decoration-color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
img { max-width: 100%; height: auto; }
::selection { background: var(--accent); color: #fff; }

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

/* ---------- header ---------- */
.site-head {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 24px 0; border-bottom: 1px solid var(--rule);
}
.brand {
  font: 600 14px/1 var(--sans); letter-spacing: .32em; text-transform: uppercase; white-space: nowrap;
  text-decoration: none; color: var(--ink);
}
.brand:hover { color: var(--ink); }
.nav { display: flex; gap: 28px; align-items: center; font: 500 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; }
.nav a { text-decoration: none; color: var(--ink-soft); padding: 6px 0; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.nav a[aria-current="page"] { box-shadow: 0 1px 0 var(--ink); }
.theme-btn {
  background: none; border: 1px solid var(--rule-strong); color: var(--ink-soft);
  border-radius: 0; padding: 6px 9px; font: 500 11px/1 var(--mono); letter-spacing: .12em;
  text-transform: uppercase; cursor: pointer;
}
.theme-btn:hover { color: var(--ink); border-color: var(--ink); }

/* ---------- small type helpers ---------- */
.kicker {
  font: 500 12px/1 var(--mono); letter-spacing: .16em; text-transform: uppercase;
  color: var(--ink-faint); margin: 0 0 22px;
}
.kicker a { text-decoration: none; }
.kicker .addr { color: var(--accent-ink); margin-right: 12px; }
.mono { font-family: var(--mono); }
.muted { color: var(--ink-faint); }

/* ---------- hero ---------- */
.hero { padding: 112px 0 64px; }
.hero h1 {
  font: 500 clamp(38px, 6.4vw, 76px)/1.02 var(--sans); letter-spacing: -.035em;
  margin: 0 0 28px; max-width: 18ch; color: var(--ink-faint);
}
.hero h1 em { font-style: normal; color: var(--ink); }
.hero p.lede { font-size: 19px; line-height: 1.6; color: var(--ink-soft); max-width: 40rem; margin: 0 0 32px; }
.hero .open {
  font: 500 12.5px/1.5 var(--mono); letter-spacing: .04em; color: var(--ink);
  display: inline-flex; gap: 12px; align-items: center; margin: 0;
}
.hero .open::before { content: ""; width: 7px; height: 7px; background: var(--accent); flex: none; }
.hero .building { font-size: 15px; line-height: 1.6; color: var(--ink-soft); max-width: 40rem; margin: 14px 0 0; padding-left: 19px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.btn {
  display: inline-block; padding: 13px 20px; border-radius: 0; text-decoration: none;
  font: 500 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase;
  border: 1px solid var(--rule-strong); color: var(--ink); background: transparent;
  transition: border-color .15s, background .15s, color .15s;
}
.btn.primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn:hover { border-color: var(--ink); color: var(--ink); }
.btn.primary:hover { background: transparent; color: var(--ink); }

/* ---------- proof strip ---------- */
.proof {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); margin: 0 0 112px;
}
.proof a { display: block; padding: 32px 28px 32px 0; text-decoration: none; }
.proof a + a { padding-left: 28px; border-left: 1px solid var(--rule); }
.proof .num { font: 500 clamp(30px, 3.6vw, 44px)/1 var(--sans); color: var(--ink); letter-spacing: -.03em; }
.proof .lbl { font-size: 14.5px; color: var(--ink-soft); margin-top: 14px; line-height: 1.5; max-width: 22rem; }
.proof a:hover .num { color: var(--accent-ink); }

/* ---------- section headings on lists ---------- */
.block { margin: 0 0 112px; }
.block-head {
  display: flex; justify-content: space-between; align-items: baseline;
  padding-bottom: 18px; margin-bottom: 0; border-bottom: 1px solid var(--rule);
}
.block-head h2 { font: 500 12px/1 var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--ink-faint); margin: 0; }
.block-head a { font: 500 12px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-soft); text-decoration: none; }
.block-head a:hover { color: var(--ink); }

/* ---------- work cards: a hairline grid, not floating cards ---------- */
.cards {
  display: grid; grid-template-columns: repeat(2, 1fr);
  border-left: 1px solid var(--rule); border-top: 1px solid var(--rule);
}
.block .cards { border-top: 0; }
.card {
  display: flex; flex-direction: column; gap: 14px; text-decoration: none;
  border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
  padding: 32px 30px; min-height: 280px; transition: background .15s;
}
.card:hover { background: var(--bg-hover); color: inherit; }
.card .cat { font: 500 11.5px/1 var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--accent-ink); }
.card h3 { font: 500 24px/1.2 var(--sans); letter-spacing: -.015em; margin: 4px 0 0; }
.card p { margin: 0; color: var(--ink-soft); font-size: 15.5px; line-height: 1.6; }
.card .result {
  margin-top: auto; padding-top: 16px; border-top: 1px solid var(--rule);
  font: 400 12.5px/1.6 var(--mono); color: var(--ink-soft);
}
.card .result b { color: var(--ink); font-weight: 600; }
.card:hover h3::after { content: " \2192"; color: var(--accent-ink); }
.badge {
  display: inline-block; font: 600 10px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase;
  padding: 4px 6px; border: 1px solid var(--accent); color: var(--accent-ink); vertical-align: middle;
}

/* ---------- post list ---------- */
.posts { list-style: none; margin: 0; padding: 0; }
.page-head + .tagrow + .posts, .tagrow + .posts { border-top: 1px solid var(--rule); }
.posts li {
  display: grid; grid-template-columns: 8.5rem 1fr auto; gap: 24px; align-items: baseline;
  padding: 20px 0; border-bottom: 1px solid var(--rule);
}
.posts time { font: 500 12px/1.4 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-faint); }
.posts .t { font-weight: 500; text-decoration: none; font-size: 18px; line-height: 1.4; letter-spacing: -.005em; }
.posts .t:hover { color: var(--accent-ink); }
.posts .desc { display: block; color: var(--ink-soft); font-size: 14.5px; margin-top: 6px; line-height: 1.55; }
.posts .where { font: 500 11.5px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-faint); white-space: nowrap; }
.posts .where.ext::after { content: " \2197"; }

.tagrow { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 32px; }
.tag {
  font: 500 11.5px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; text-decoration: none;
  padding: 8px 10px; border-radius: 0; border: 1px solid var(--rule); color: var(--ink-soft);
}
.tag:hover, .tag.on { border-color: var(--ink); color: var(--ink); }

/* ---------- page header ---------- */
.page-head { padding: 88px 0 40px; }
.page-head h1 { font: 500 clamp(34px, 5vw, 56px)/1.05 var(--sans); letter-spacing: -.03em; margin: 0 0 20px; max-width: 22ch; }
.page-head .summary { font-size: 19px; color: var(--ink-soft); margin: 0; max-width: 42rem; line-height: 1.6; }
.meta {
  display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--rule);
  font: 400 12.5px/1.5 var(--mono); color: var(--ink-soft);
}
.meta b { color: var(--ink-faint); font-weight: 500; letter-spacing: .14em; text-transform: uppercase; font-size: 11px; margin-right: 8px; }

.results {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
  margin: 0 0 48px;
}
.results > div { padding: 28px 24px 28px 0; }
.results > div + div { border-left: 1px solid var(--rule); padding-left: 24px; }
.results .num { font: 500 28px/1.1 var(--sans); letter-spacing: -.02em; color: var(--ink); }
.results .lbl { font-size: 14px; color: var(--ink-soft); margin-top: 10px; line-height: 1.5; }

.links { display: flex; flex-wrap: wrap; gap: 12px; margin: 0 0 56px; }

/* ---------- prose ---------- */
.prose { max-width: var(--measure); overflow-wrap: break-word; }
.prose :not(pre) > code { overflow-wrap: anywhere; }
.prose h2 { font: 500 28px/1.2 var(--sans); margin: 64px 0 16px; letter-spacing: -.02em; }
.prose h3 { font: 500 20px/1.3 var(--sans); margin: 40px 0 12px; }
.prose p, .prose ul, .prose ol { margin: 0 0 20px; color: var(--ink); }
.prose li { margin: 6px 0; }
.prose blockquote {
  margin: 28px 0; padding: 2px 0 2px 20px; border-left: 2px solid var(--accent); color: var(--ink-soft);
}
.prose code {
  font: 400 .86em/1 var(--mono); background: var(--bg-raised); color: var(--ink);
  padding: 2px 5px; border: 1px solid var(--rule);
}
.prose pre {
  background: var(--code-bg); border: 1px solid var(--rule); border-radius: 0; padding: 18px 20px;
  overflow-x: auto; font: 400 13.5px/1.65 var(--mono); margin: 0 0 24px;
}
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; color: inherit; }
.prose table { width: 100%; border-collapse: collapse; margin: 0 0 28px; font-size: 15px; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: 11px 14px 11px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.prose td code { white-space: nowrap; }
.prose th { font: 500 11px/1.3 var(--mono); text-transform: uppercase; letter-spacing: .14em; color: var(--ink-faint); border-bottom-color: var(--rule-strong); }
.prose img { display: block; margin: 28px 0 8px; border: 1px solid var(--rule); }
.prose p.caption { font: 400 12.5px/1.5 var(--mono); color: var(--ink-faint); margin: 0 0 28px; }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 48px 0; }

.note {
  border: 1px solid var(--rule); border-left: 2px solid var(--accent);
  padding: 16px 20px; background: var(--bg-raised); font-size: 15px; color: var(--ink-soft); margin: 0 0 32px;
}

.pager { display: flex; justify-content: space-between; gap: 24px; margin: 80px 0 0; padding-top: 24px; border-top: 1px solid var(--rule); font: 500 12.5px/1.5 var(--mono); }
.pager a { text-decoration: none; color: var(--ink-soft); }
.pager a:hover { color: var(--ink); }

/* ---------- about ---------- */
.timeline { list-style: none; padding: 0; margin: 0 0 32px; border-top: 1px solid var(--rule); }
.timeline li { display: grid; grid-template-columns: 12rem 1fr; gap: 24px; padding: 18px 0; border-bottom: 1px solid var(--rule); }
.timeline .when { font: 500 12px/1.7 var(--mono); letter-spacing: .04em; color: var(--ink-faint); }
.timeline .what b { font-weight: 500; }
.timeline .what span { display: block; color: var(--ink-soft); font-size: 15px; margin-top: 2px; }

/* ---------- footer ---------- */
.site-foot {
  margin-top: 128px; padding: 32px 0 48px; border-top: 1px solid var(--rule);
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px;
  font: 500 11.5px/1.6 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-faint);
}
.site-foot nav { display: flex; flex-wrap: wrap; gap: 24px; }
.site-foot a { text-decoration: none; color: var(--ink-soft); }
.site-foot a:hover { color: var(--ink); }

/* ---------- small screens ---------- */
@media (max-width: 760px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .site-head { padding: 18px 0; }
  .brand { letter-spacing: .24em; font-size: 13px; }
  .nav { gap: 16px; font-size: 11px; letter-spacing: .1em; }
  .hero { padding: 64px 0 40px; }
  .page-head { padding: 56px 0 28px; }
  .proof { grid-template-columns: 1fr; margin-bottom: 72px; }
  .proof a, .proof a + a { padding: 24px 0; border-left: 0; }
  .proof a + a { border-top: 1px solid var(--rule); }
  .block { margin-bottom: 72px; }
  .cards { grid-template-columns: 1fr; }
  .card { min-height: 0; padding: 26px 20px; }
  .posts li { grid-template-columns: 1fr; gap: 6px; }
  .results > div, .results > div + div { padding: 20px 0; border-left: 0; }
  .results > div + div { border-top: 1px solid var(--rule); }
  .timeline li { grid-template-columns: 1fr; gap: 2px; }
}
@media (max-width: 480px) {
  .brand { letter-spacing: .18em; }
  .nav { gap: 12px; letter-spacing: .06em; }
  .nav a.rss { display: none; }
  .theme-btn { padding: 6px 7px; letter-spacing: .06em; }
}
@media (max-width: 360px) {
  .site-head { flex-wrap: wrap; row-gap: 14px; }
}