/* NumericalOS - a plain, dense, readable technical site. */

:root {
  color-scheme: light dark;
  --bg: #fbfbfa;
  --fg: #1a1a19;
  --dim: #5f5f5b;
  --rule: #d8d8d2;
  --accent: #0b6b5f;
  --code-bg: #f2f2ee;
  --warn-bg: #fdf6e3;
  --warn-rule: #b8912f;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14150f;
    --fg: #e8e8e0;
    --dim: #9a9a90;
    --rule: #33342b;
    --accent: #6fd3bf;
    --code-bg: #1c1d16;
    --warn-bg: #241f0f;
    --warn-rule: #8a6d1f;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-text-size-adjust: 100%;
}

header {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  align-items: baseline;
  padding: 1.1rem 1.5rem;
  border-bottom: 1px solid var(--rule);
}

.brand {
  font-weight: 650;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--fg);
}

nav { display: flex; flex-wrap: wrap; gap: 1.1rem; }
nav a { color: var(--dim); text-decoration: none; font-size: 0.92rem; }
nav a:hover, nav a.on { color: var(--accent); }

main {
  max-width: 46rem;
  margin: 0 auto;
  padding: 2.2rem 1.5rem 4rem;
}

h1 { font-size: 1.85rem; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 0.6rem; }
h2 { font-size: 1.22rem; margin: 2.4rem 0 0.7rem; letter-spacing: -0.01em; }
h3 { font-size: 1.02rem; margin: 1.8rem 0 0.5rem; }

p, li { max-width: 42rem; }
a { color: var(--accent); }

.lead { font-size: 1.06rem; color: var(--dim); }

code, pre, .mono, .cmd, .code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

code { background: var(--code-bg); padding: 0.1em 0.35em; border-radius: 3px; font-size: 0.88em; }

pre {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  font-size: 0.84rem;
  line-height: 1.55;
}
pre code { background: none; padding: 0; font-size: inherit; }

.cmd { background: var(--code-bg); }

table { border-collapse: collapse; width: 100%; margin: 1rem 0; font-size: 0.9rem; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 0.45rem 0.7rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-weight: 600; color: var(--dim); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; }
td.num { text-align: right; font-family: ui-monospace, monospace; color: var(--dim); white-space: nowrap; }

.files td:first-child, .mono { font-family: ui-monospace, monospace; font-size: 0.86rem; }
.skills td:first-child { white-space: nowrap; font-family: ui-monospace, monospace; font-size: 0.84rem; }

.status {
  background: var(--warn-bg);
  border-left: 3px solid var(--warn-rule);
  padding: 0.85rem 1.1rem;
  margin: 1.6rem 0;
  border-radius: 0 4px 4px 0;
}
.status strong { display: block; margin-bottom: 0.2rem; }

.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); margin: 1.4rem 0; }
.card { border: 1px solid var(--rule); border-radius: 6px; padding: 1rem 1.1rem; }
.card h3 { margin-top: 0; }
.card p { font-size: 0.9rem; color: var(--dim); margin-bottom: 0; }

footer {
  border-top: 1px solid var(--rule);
  padding: 1.6rem 1.5rem 3rem;
  color: var(--dim);
  font-size: 0.86rem;
}
footer p { max-width: none; margin: 0.3rem 0; }
footer a { color: var(--dim); }

figure { margin: 1.5rem 0; }
figure pre { font-size: 0.78rem; }
figcaption { color: var(--dim); font-size: 0.85rem; margin-top: 0.5rem; }