/* Charlie Whitaker – personal site
   Minimal, single-column, content-first. Accent: #2052BB */

:root {
  --bg: #ffffff;
  --fg: #1b1d21;
  --muted: #646a75;
  --accent: #2052bb;
  --accent-soft: rgba(32, 82, 187, 0.10);
  --rule: #e3e5e9;
  --code-bg: #f4f5f7;
  --demo-bg: #fafbfc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #e7e8ea;
    --muted: #9ba1ac;
    --accent: #7fa3f5;
    --accent-soft: rgba(127, 163, 245, 0.16);
    --rule: #2a2d34;
    --code-bg: #1d2026;
    --demo-bg: #181b20;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  text-rendering: optimizeLegibility;
}

.wrap {
  max-width: 660px;
  margin: 0 auto;
  padding: 0 20px 72px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--accent); color: #fff; padding: 8px 12px; z-index: 10;
}
.skip:focus { left: 8px; top: 8px; }

/* ---------- header ---------- */
.site-header { padding: 36px 0 20px; }

.site-title {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.site-title:hover { text-decoration: none; color: var(--accent); }

.nav, .social {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  margin-top: 10px;
}
.nav a { font-weight: 600; color: var(--fg); }
.nav a:hover { color: var(--accent); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--accent); }

.social { margin-top: 4px; font-size: 0.92rem; }
.social a { color: var(--muted); }
.social a:hover { color: var(--accent); }

hr.rule { border: 0; border-top: 1px solid var(--rule); margin: 18px 0 8px; }

/* ---------- typography ---------- */
h1 {
  font-size: 2.15rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 28px 0 10px;
}
h2 {
  font-size: 1.5rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 2.4rem 0 0.6rem;
}
h3 { font-size: 1.1rem; margin: 1.6rem 0 0.3rem; }

p { margin: 0 0 1.05rem; }
ul { padding-left: 1.2rem; margin: 0.3rem 0 1.1rem; }
li { margin: 0.25rem 0; }

.lede { font-size: 1.12rem; }
.meta { color: var(--muted); font-size: 0.92rem; margin: 0 0 1.4rem; }
.note {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 10px 14px;
  margin: 1.4rem 0;
  border-radius: 0 6px 6px 0;
}
.note p:last-child { margin-bottom: 0; }

strong.hl { color: var(--accent); }

code {
  font: 0.88em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
pre {
  background: var(--code-bg);
  padding: 14px 16px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
  margin: 1.2rem 0;
}
pre code { background: none; padding: 0; font-size: inherit; }

/* ---------- project list ---------- */
.post { padding: 0 0 6px; }
.post h2 { margin: 2rem 0 0.15rem; font-size: 1.55rem; }
.post h2 a { color: var(--fg); }
.post h2 a:hover { color: var(--accent); text-decoration: none; }
.post .tags { color: var(--muted); font-size: 0.9rem; margin: 0 0 0.45rem; }

/* ---------- CV entries ---------- */
.entry { margin: 1.1rem 0 1.4rem; }
.entry .row {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2px 16px;
}
.entry .what { font-weight: 700; }
.entry .when { color: var(--muted); font-size: 0.92rem; white-space: nowrap; }
.entry .where { color: var(--muted); font-size: 0.95rem; }
.entry ul { margin-top: 0.4rem; }

/* ---------- buttons ---------- */
.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  padding: 10px 20px;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  font-family: inherit;
}
.button:hover { text-decoration: none; filter: brightness(1.08); }
.button.ghost {
  background: transparent; color: var(--accent);
  border: 1px solid var(--accent); padding: 6px 14px; font-size: 0.9rem;
}

.price {
  font-size: 2rem; font-weight: 700; letter-spacing: -0.02em; margin: 0.2rem 0;
}
.price span { font-size: 1rem; font-weight: 500; color: var(--muted); }

/* ---------- interactive demo ---------- */
figure.demo {
  margin: 1.6rem 0;
  padding: 12px;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--demo-bg);
}
figure.demo svg { display: block; width: 100%; height: auto; }

.edge { fill: none; stroke: var(--muted); stroke-width: 1.6; opacity: 0.75; }
.node circle { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 2; }
.node .letter { font: 700 15px system-ui, sans-serif; fill: var(--fg); text-anchor: middle; }
.node .val { font: 11px ui-monospace, Menlo, Consolas, monospace; fill: var(--muted); text-anchor: middle; }
#arrow-head { fill: var(--muted); }

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 22px;
  margin-top: 8px;
  font-size: 0.92rem;
}
.controls label { display: block; font-weight: 600; }
.controls output { color: var(--accent); font-weight: 700; margin-left: 6px; }
.controls input[type="range"] { width: 100%; accent-color: var(--accent); margin-top: 4px; }
.demo-actions { display: flex; gap: 10px; align-items: center; margin-top: 10px; flex-wrap: wrap; }
.readout { color: var(--muted); font-size: 0.9rem; margin: 10px 0 0; }

@media (max-width: 520px) {
  body { font-size: 16.5px; }
  h1 { font-size: 1.8rem; }
  .controls { grid-template-columns: 1fr; }
  .entry .when { white-space: normal; }
}

/* ---------- footer ---------- */
.site-footer {
  margin-top: 3.5rem;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.88rem;
}

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

@media print {
  .nav, .social, .skip, .button { display: none; }
  body { font-size: 12pt; }
}