:root {
  color-scheme: dark;
  --bg: #0a0a0a;
  --bg-raise: #111111;
  --fg: #ededed;
  --muted: #8f8f8f;
  --faint: #7d7d7d;
  --border: #242424;
  --accent: #54d795;
  --accent-ink: #06140d;
  --logo-bg: #54d795;
  --logo-ink: #06140d;
  --radius: 10px;
  --nav-bg: rgba(10,10,10,.75);
  --border-hover: #3a3a3a;
  --primary-hover: #d4d4d4;
  --hero-glow: rgba(255,255,255,.07);
  --shadow: rgba(0,0,0,.5);
  --terminal-dot: #2e2e2e;
  --accent-border: rgba(84,215,149,.3);
  --accent-soft: rgba(84,215,149,.08);
  --focus: #54d795;
  --error: #f87171;
}

@media (prefers-color-scheme: light) {
:root {
  color-scheme: light;
  --bg: #fafafa;
  --bg-raise: #ffffff;
  --fg: #202020;
  --muted: #595959;
  --faint: #666666;
  --border: #dedede;
  --accent: #147a49;
  --accent-ink: #ffffff;
  --nav-bg: rgba(250,250,250,.85);
  --border-hover: #aaaaaa;
  --primary-hover: #404040;
  --hero-glow: rgba(20,122,73,.08);
  --shadow: rgba(0,0,0,.1);
  --terminal-dot: #cccccc;
  --accent-border: rgba(20,122,73,.3);
  --accent-soft: rgba(20,122,73,.08);
  --focus: #147a49;
  --error: #b42318;
}
}

/* Shared foundations; page-specific layout stays with each page. */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
code, .mono { font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace; }
@media (max-width: 380px) {
  :root .nav-links { gap: 8px; }
  :root .nav-links .btn { padding: 8px; }
}

/* Shared landing and article components. */
body {
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 24px; }
.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--accent-ink);
  padding: 10px 16px; border-radius: 0 0 8px 0;
  font-size: 14px; font-weight: 600;
}
.skip:focus { left: 0; }
nav {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(12px);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -.01em; }
.logo-mark {
  width: 26px; height: 26px; border-radius: 8px;
  background: var(--accent);
  display: grid; place-items: center;
}
.logo-mark span {
  width: 10px; height: 10px; border-radius: 3px;
  border: 2px solid var(--accent-ink);
}
nav .logo-mark {
  background: var(--logo-bg);
}
nav .logo-mark span {
  border-color: var(--logo-ink);
}
.nav-links { display: flex; align-items: center; gap: 24px; font-size: 14px; color: var(--muted); }
.nav-links a:hover { color: var(--fg); }
@media (max-width: 470px) {
  .nav-links { gap: 12px; }
  .nav-links .hide-sm { display: none; }
}
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  border-radius: 8px; padding: 9px 18px;
  font-size: 14px; font-weight: 500; cursor: pointer;
  border: 1px solid var(--border); background: transparent; color: var(--fg);
  transition: background .15s, border-color .15s;
}
.btn:hover { border-color: var(--border-hover); background: var(--bg-raise); }
.btn-primary { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.hero::before {
  content: ""; position: absolute; inset: -40% 0 auto 0; height: 600px;
  background: radial-gradient(ellipse 60% 55% at 50% 0%, var(--hero-glow), transparent 70%);
  pointer-events: none;
}
.kicker {
  font-size: 13px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--faint); margin-bottom: 12px;
}
h2 { font-size: clamp(1.6rem, 3vw, 2.1rem); letter-spacing: -.02em; margin-bottom: 14px; }
.card {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; background: var(--bg-raise);
  transition: border-color .15s;
}
.card:hover { border-color: var(--border-hover); }
.card p { font-size: 14px; color: var(--muted); }
footer { border-top: 1px solid var(--border); padding: 36px 0; }
.footer-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 16px;
  font-size: 13px; color: var(--faint);
}
.footer-links a:hover { color: var(--muted); }