/* Sai — portfolio. Three colors: paper, ink, amber. */

:root {
  --paper: #fcfcfa;
  --ink: #1c1c1a;
  --gray: #6e6e68;
  --accent: #b45309;
  --link: #1d4ed8;
  --line: #e4e4de;
  --panel: #f4f4ef;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.9rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ---------- column ---------- */

.page {
  max-width: 740px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- header / nav ---------- */

.site-header {
  border-bottom: 1px solid var(--line);
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
}

.site-nav a {
  display: inline-block;
  padding: 14px 1px 12px;
  color: var(--gray);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px; /* sit on the header rule */
  transition: color 0.15s;
}

.site-nav a:hover { color: var(--ink); }

.site-nav a.active {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* ---------- content ---------- */

main { padding: 88px 0 72px; }

h1 {
  font-size: 2.1rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1rem;
  font-weight: 700;
  margin: 48px 0 16px;
  text-transform: lowercase;
}

p + p { margin-top: 14px; }

a { color: var(--ink); transition: color 0.15s; }
a:hover { color: var(--accent); }

.aka {
  color: var(--gray);
  font-size: 0.82rem;
  margin-top: 6px;
}

.bio { margin-top: 22px; max-width: 58ch; }

.bracket-links { margin-top: 22px; color: var(--gray); }
.bracket-links a { text-decoration: none; border-bottom: 1px solid var(--line); }
.bracket-links a:hover { border-bottom-color: var(--accent); }

/* ---------- pull quote ---------- */

blockquote.pull {
  margin: 28px 0;
  padding-left: 18px;
  border-left: 2px solid var(--accent);
  font-style: italic;
  color: var(--ink);
}

blockquote.pull .attr {
  display: block;
  margin-top: 8px;
  font-style: normal;
  font-size: 0.82rem;
  color: var(--gray);
}

/* ---------- code / equation panel ---------- */

pre.panel {
  margin: 28px 0;
  padding: 18px 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  font-size: 0.82rem;
  line-height: 1.7;
  overflow-x: auto;
}

pre.panel .cm { color: var(--gray); }   /* comment */
pre.panel .kw { color: var(--accent); } /* keyword-ish */

/* ---------- open source list ---------- */

.os-list {
  list-style: disc;
  margin-top: 4px;
  line-height: 1.9;
}

.os-list li {
  margin: 10px 0 10px 22px;
}

.os-list li::marker { color: var(--gray); }

.os-list a {
  color: var(--link);
  font-weight: 500;
  text-decoration: none;
}

.os-list a:hover { text-decoration: underline; }

.os-foot { margin-top: 26px; }

.os-foot a {
  color: var(--gray);
  font-size: 0.8rem;
  text-decoration: none;
}

.os-foot a:hover { color: var(--ink); text-decoration: underline; }

/* ---------- writing list ---------- */

.writing-list {
  list-style: none;
  margin-top: 8px;
}

.writing-list li {
  display: flex;
  gap: 20px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.writing-list time {
  flex: 0 0 88px;
  color: var(--gray);
  font-size: 0.82rem;
  padding-top: 1px;
}

.writing-list a { text-decoration: none; }
.writing-list a:hover { text-decoration: underline; }

/* ---------- about: plain lists ---------- */

.plain { margin-top: 4px; }
.plain li { margin: 6px 0 6px 18px; }

.note { color: var(--gray); font-size: 0.82rem; }

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--line);
  padding: 20px 0 32px;
  color: var(--gray);
  font-size: 0.78rem;
}

/* ---------- small screens ---------- */

@media (max-width: 560px) {
  main { padding-top: 64px; }
  .writing-list li { flex-direction: column; gap: 2px; }
}