/* Matthew Collaro, personal site
   Single stylesheet, no external requests, light + dark. */

:root {
  --bg: #ffffff;
  --surface: #f6f7f9;
  --text: #16191d;
  --muted: #5a626d;
  --line: #e2e5ea;
  --accent: #12604a;
  --accent-soft: #e7f2ee;
  --max: 44rem;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #171a20;
    --text: #e7e9ec;
    --muted: #9aa3ae;
    --line: #262b33;
    --accent: #5ec9a5;
    --accent-soft: #14241f;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 10;
  background: var(--accent);
  color: var(--bg);
  padding: 0.5rem 0.9rem;
  border-radius: 6px;
}

/* Header ---------------------------------------------------------------- */

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 5;
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
  padding-block: 0.9rem;
}

.brand {
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
}

.site-header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
}

.site-header nav a:hover,
.site-header nav a[aria-current="page"] {
  color: var(--accent);
}

/* Content --------------------------------------------------------------- */

main { padding-block: 2.75rem 3.5rem; }

.page-head { margin-bottom: 1.75rem; }

h1 {
  font-size: clamp(1.85rem, 4.5vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 0 0 0.35rem;
}

h2 {
  font-size: 1.4rem;
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin: 2.5rem 0 0.75rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--line);
}

h3 {
  font-size: 1.12rem;
  margin: 1.9rem 0 0.5rem;
}

h4 {
  font-size: 1rem;
  margin: 1.5rem 0 0.4rem;
  color: var(--muted);
}

p { margin: 0 0 1.05rem; }

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }

.byline {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
}

ul, ol { padding-left: 1.3rem; margin: 0 0 1.05rem; }
li { margin-bottom: 0.45rem; }

blockquote {
  margin: 1.4rem 0;
  padding: 0.15rem 0 0.15rem 1.1rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

strong { font-weight: 650; }

/* Footer ---------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
  padding-block: 1.75rem 2.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.site-footer p { margin: 0 0 0.35rem; }
.site-footer .fine { font-size: 0.82rem; opacity: 0.75; margin-top: 0.6rem; }

/* Print ----------------------------------------------------------------- */

@media print {
  .site-header, .site-footer, .skip { display: none; }
  body { font-size: 11pt; color: #000; background: #fff; }
  a { color: #000; text-decoration: none; }
  h2 { border-top: none; }
}