/* ansonchu.com — engineering notebook
   No build step, no external fonts, no JS required. */

:root {
  --paper:  #FCFCFA;
  --ink:    #1A1B1E;
  --muted:  #6B6E76;
  --faint:  #E4E3DE;
  --accent: #1F4FC4;
  --accent-soft: #eaeef9;

  --serif: Charter, "Bitstream Charter", "Iowan Old Style", "Palatino Linotype",
           Georgia, "Times New Roman", serif;
  --mono:  ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas,
           "Liberation Mono", monospace;

  --measure: 40rem;      /* ~640px reading column */
  --gap: 1.6rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:  #121316;
    --ink:    #E7E7E3;
    --muted:  #969AA2;
    --faint:  #2A2C31;
    --accent: #86A8FF;
    --accent-soft: #1b2130;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.62;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 4.5rem 1.4rem 6rem;
}

/* ---- masthead ---- */
.masthead { margin-bottom: 3.2rem; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.9rem;
}

h1.name {
  font-size: clamp(2.3rem, 7vw, 3.1rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 600;
  margin: 0 0 0.6rem;
}

.role {
  font-family: var(--mono);
  font-size: 0.86rem;
  color: var(--muted);
  margin: 0 0 1.6rem;
  letter-spacing: 0.01em;
}

.bio { margin: 0 0 1.7rem; }
.bio p { margin: 0 0 1rem; }

/* ---- link row ---- */
.links {
  font-family: var(--mono);
  font-size: 0.82rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0;
  align-items: center;
  padding: 0;
  list-style: none;
  margin: 0;
}
.links li { display: inline-flex; align-items: center; }
.links li:not(:last-child)::after {
  content: "·";
  color: var(--faint);
  margin: 0 0.7rem;
}

/* ---- section ---- */
.section { margin-top: 3.4rem; }

.section-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--faint);
}

/* ---- writing index: changelog style ---- */
.index { list-style: none; margin: 0; padding: 0; }
.index li { margin: 0 0 0.55rem; }

.entry {
  display: grid;
  grid-template-columns: 6.2rem 1fr;
  gap: 0.6rem 1rem;
  align-items: baseline;
  text-decoration: none;
  color: inherit;
  padding: 0.25rem 0;
}
.entry:hover .entry-title { color: var(--accent); }
.entry:hover .entry-title::after { opacity: 1; transform: translateX(0); }

.entry-date {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--muted);
  letter-spacing: 0.01em;
  white-space: nowrap;
  padding-top: 0.15rem;
}
.entry-title {
  font-size: 1.02rem;
  transition: color 0.15s ease;
}
.entry-title::after {
  content: " →";
  opacity: 0;
  transform: translateX(-3px);
  display: inline-block;
  transition: opacity 0.15s ease, transform 0.15s ease;
  color: var(--accent);
}
.entry-note {
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

/* theme grouping within the index */
.theme-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 1.9rem 0 0.7rem;
}
.theme-label:first-child { margin-top: 0; }

/* ---- generic links ---- */
a { color: var(--accent); text-decoration: none; }
a:not(.entry):not(.backlink) {
  border-bottom: 1px solid var(--accent-soft);
}
a:hover { border-bottom-color: var(--accent); }

/* ---- article / post ---- */
.backlink {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  display: inline-block;
  margin-bottom: 3rem;
}
.backlink:hover { color: var(--accent); }

article h1 {
  font-size: clamp(1.9rem, 5.5vw, 2.5rem);
  line-height: 1.08;
  letter-spacing: -0.018em;
  font-weight: 600;
  margin: 0 0 0.7rem;
}
.post-meta {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--muted);
  margin: 0 0 2.6rem;
  letter-spacing: 0.02em;
}

article h2 {
  font-size: 1.4rem;
  letter-spacing: -0.01em;
  margin: 2.8rem 0 0.8rem;
  line-height: 1.2;
}
article h3 {
  font-size: 1.13rem;
  margin: 2rem 0 0.6rem;
}
article p { margin: 0 0 1.25rem; }
article ul, article ol { margin: 0 0 1.25rem; padding-left: 1.3rem; }
article li { margin: 0 0 0.4rem; }

blockquote {
  margin: 1.6rem 0;
  padding: 0.2rem 0 0.2rem 1.3rem;
  border-left: 2px solid var(--faint);
  color: var(--muted);
  font-style: italic;
}

/* code */
code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--accent-soft);
  padding: 0.12em 0.35em;
  border-radius: 3px;
}
pre {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.5;
  background: var(--accent-soft);
  padding: 1rem 1.1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 0 0 1.5rem;
}
pre code { background: none; padding: 0; font-size: inherit; }

hr {
  border: none;
  border-top: 1px solid var(--faint);
  margin: 3rem 0;
}

figure { margin: 2rem 0; }
figure img { max-width: 100%; height: auto; display: block; border-radius: 4px; }
figcaption {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--muted);
  margin-top: 0.6rem;
}

/* footnotes */
.footnotes {
  margin-top: 3.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--faint);
  font-size: 0.86rem;
  color: var(--muted);
}
.footnotes ol { padding-left: 1.2rem; }

/* site footer */
.site-footer {
  margin-top: 5rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--faint);
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--muted);
}

/* focus visibility */
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

@media (max-width: 480px) {
  body { font-size: 18px; }
  .wrap { padding: 3rem 1.2rem 4rem; }
  .entry { grid-template-columns: 5rem 1fr; gap: 0.4rem 0.7rem; }
}