/* Layout: a lab-notebook index of dated posts; one reading column, quiet chrome, mono labels for dates and numbers.
   Color: cool paper, ink, one steel-blue accent, one pale highlight for key figures. Type: Bricolage (display), Source Serif (reading), JetBrains Mono (labels). */
:root {
  --bg: #f2f4f7;
  --surface: #ffffff;
  --ink: #141b26;
  --muted: #5b6675;
  --rule: #d5dbe3;
  --accent: #0a6c8f;
  --accent-ink: #ffffff;
  --mark: #ffeab8;
  --font-display: "Bricolage Grotesque", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f141b; --surface: #161d27; --ink: #e6ebf2; --muted: #9aa6b5; --rule: #283241;
    --accent: #5cc3e4; --accent-ink: #0f141b; --mark: #3b3320; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f141b; --surface: #161d27; --ink: #e6ebf2; --muted: #9aa6b5; --rule: #283241;
  --accent: #5cc3e4; --accent-ink: #0f141b; --mark: #3b3320; color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  background: var(--bg); color: var(--ink); margin: 0;
  font-family: var(--font-body); font-size: 18px; line-height: 1.65;
  padding-block: 0 72px;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.wrap { width: 100%; max-width: 720px; margin: 0 auto; }
header.site { padding: 36px 0 20px; border-bottom: 1px solid var(--rule); display: flex; gap: 12px 24px; flex-wrap: wrap; align-items: baseline; justify-content: space-between; }
.brand { font-family: var(--font-display); font-weight: 700; font-size: 20px; letter-spacing: -0.01em; color: var(--ink); text-decoration: none; }
.tag { font-family: var(--font-mono); font-size: 12px; color: var(--muted); letter-spacing: 0.04em; text-transform: uppercase; }
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

/* index */
.intro { padding: 40px 0 8px; }
.intro h1 { font-family: var(--font-display); font-weight: 700; font-size: clamp(32px, 6vw, 46px); line-height: 1.08; letter-spacing: -0.02em; margin: 0 0 14px; text-wrap: balance; }
.intro p { margin: 0; color: var(--muted); max-width: 56ch; }
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin: 22px 0 6px; }
.btn { font-family: var(--font-mono); font-size: 13px; background: var(--surface); color: var(--ink); border: 1px solid var(--rule); border-radius: 6px; padding: 8px 12px; cursor: pointer; line-height: 1.2; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); color: var(--accent-ink); }
.posts { list-style: none; margin: 18px 0 0; padding: 0; display: grid; gap: 0; }
.posts li { border-top: 1px solid var(--rule); }
.posts li:last-child { border-bottom: 1px solid var(--rule); }
.posts a.row { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 4px 24px; padding: 22px 0; text-decoration: none; color: inherit; }
.posts a.row:hover h2 { color: var(--accent); }
.kicker { font-family: var(--font-mono); font-size: 12.5px; color: var(--muted); letter-spacing: 0.03em; padding-top: 6px; }
.posts h2 { font-family: var(--font-display); font-weight: 700; font-size: 22px; line-height: 1.2; letter-spacing: -0.01em; margin: 0 0 6px; text-wrap: balance; }
.posts p { margin: 0; color: var(--muted); font-size: 16px; line-height: 1.5; }
.posts .rt { display: block; margin-top: 8px; font-family: var(--font-mono); font-size: 12px; color: var(--muted); }
@media (max-width: 560px) { .posts a.row { grid-template-columns: minmax(0, 1fr); } .kicker { padding-top: 0; } }

/* post */
.back { display: inline-block; margin: 28px 0 0; font-family: var(--font-mono); font-size: 13px; text-decoration: none; }
article.post { padding-top: 16px; }
article.post .kicker { padding: 0; margin-bottom: 10px; }
article.post h1 { font-family: var(--font-display); font-weight: 700; font-size: clamp(30px, 5.5vw, 42px); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 18px; text-wrap: balance; }
.lede { font-size: 20px; line-height: 1.5; color: var(--muted); margin: 0 0 18px; }
.meta { display: flex; gap: 10px 14px; flex-wrap: wrap; align-items: center; margin: 0 0 28px; padding-bottom: 22px; border-bottom: 1px solid var(--rule); font-family: var(--font-mono); font-size: 12.5px; color: var(--muted); }
.body h2 { font-family: var(--font-display); font-weight: 700; font-size: 25px; line-height: 1.2; letter-spacing: -0.01em; margin: 40px 0 10px; text-wrap: balance; }
.body h3 { font-family: var(--font-display); font-weight: 700; font-size: 19px; margin: 28px 0 6px; }
.body p { margin: 0 0 18px; }
.body ul, .body ol { margin: 0 0 20px; padding-left: 1.3em; display: grid; gap: 8px; }
.body li::marker { color: var(--accent); }
.body strong { font-weight: 600; }
.body code { font-family: var(--font-mono); font-size: 0.82em; background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 1px 5px; overflow-wrap: anywhere; }
.body blockquote { margin: 22px 0; padding: 14px 18px; background: var(--mark); border-radius: 6px; font-style: italic; }
.body blockquote p { margin: 0; }
.tablewrap { overflow-x: auto; margin: 0 0 24px; border: 1px solid var(--rule); border-radius: 8px; background: var(--surface); }
.body table { border-collapse: collapse; width: 100%; min-width: 560px; font-size: 15px; line-height: 1.45; }
.body th, .body td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--rule); vertical-align: top; }
.body th { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); font-weight: 500; }
.body tr:last-child td { border-bottom: 0; }
.toc { margin: 0 0 30px; padding: 16px 18px; background: var(--surface); border: 1px solid var(--rule); border-radius: 8px; }
.toc h3 { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.05em; text-transform: uppercase; color: var(--muted); font-weight: 500; margin: 0 0 8px; }
.toc ol { margin: 0; padding-left: 1.3em; display: grid; gap: 4px; font-size: 16px; line-height: 1.4; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }
figure.media { margin: 28px 0; text-align: center; }
figure.media img, figure.media video { display: block; margin: 0 auto; max-width: 100%; height: auto; max-height: min(78vh, 760px); border-radius: 8px; border: 1px solid var(--rule); background: var(--surface); }
figure.media figcaption { font-family: var(--font-mono); font-size: 12.5px; color: var(--muted); margin-top: 10px; text-align: left; line-height: 1.5; }
.nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 56px; }
.nav a { display: block; padding: 14px 16px; background: var(--surface); border: 1px solid var(--rule); border-radius: 8px; text-decoration: none; color: var(--ink); min-width: 0; }
.nav a:hover { border-color: var(--accent); }
.nav small { display: block; font-family: var(--font-mono); font-size: 11.5px; color: var(--muted); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.04em; }
.nav a span { font-family: var(--font-display); font-weight: 700; font-size: 16px; line-height: 1.25; }
.nav .next { text-align: right; grid-column: 2; }
.nav .prev { grid-column: 1; }
#fallback { margin: 0 0 24px; }
#fallback textarea { width: 100%; height: 220px; font-family: var(--font-mono); font-size: 12.5px; background: var(--surface); color: var(--ink); border: 1px solid var(--rule); border-radius: 6px; padding: 10px; }
#fallback p { font-family: var(--font-mono); font-size: 12.5px; color: var(--muted); margin: 0 0 8px; }
.toast { font-family: var(--font-mono); font-size: 12.5px; color: var(--accent); }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }

/* ---- static site additions ---- */
.skip { position: absolute; left: -999px; top: 0; background: var(--accent); color: var(--accent-ink); padding: 8px 12px; z-index: 9; }
.skip:focus { left: 8px; top: 8px; }
header.site nav { display: flex; gap: 6px 20px; flex-wrap: wrap; font-family: var(--font-mono); font-size: 13px; }
header.site nav a { color: var(--muted); text-decoration: none; }
header.site nav a:hover, header.site nav a[aria-current="page"] { color: var(--accent); }
.intro p + p { margin-top: 14px; }
.sec { font-family: var(--font-display); font-weight: 700; font-size: 22px; letter-spacing: -0.01em; margin: 44px 0 6px; }
.links { display: flex; gap: 8px 18px; flex-wrap: wrap; margin: 20px 0 0; font-family: var(--font-mono); font-size: 13px; }
.more { margin: 18px 0 0; font-family: var(--font-mono); font-size: 13px; }
footer.site { margin-top: 72px; padding-top: 20px; border-top: 1px solid var(--rule); color: var(--muted); font-family: var(--font-mono); font-size: 12.5px; display: flex; gap: 8px 20px; flex-wrap: wrap; justify-content: space-between; }
footer.site a { color: var(--muted); }
.posts h2, .posts h3 { font-family: var(--font-display); font-weight: 700; font-size: 22px; line-height: 1.2; letter-spacing: -0.01em; margin: 0 0 6px; text-wrap: balance; }
.posts a.row:hover h2, .posts a.row:hover h3 { color: var(--accent); }
figure.media video.loop { background: var(--surface); }
.prose-narrow { max-width: 62ch; }
@media print { header.site nav, .nav, footer.site { display: none; } }