/* Rootless Computing — minimal hand-rolled stylesheet, no build step. */

:root {
  --bg: #0d0f12;
  --bg-elev: #14171c;
  --fg: #e8e8e6;
  --fg-dim: #a0a39b;
  --rule: #232830;
  --accent: #d6b85a;
  --link: #b9d6ff;
  --link-hover: #ffffff;
  --code-bg: #1a1e25;
  --max: 720px;
  --max-wide: 960px;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

:root[data-theme="light"] {
  --bg: #fbfaf6;
  --bg-elev: #ffffff;
  --fg: #1a1c20;
  --fg-dim: #545962;
  --rule: #e3e0d6;
  --accent: #8a6b14;
  --link: #1a4ea0;
  --link-hover: #000000;
  --code-bg: #f2efe6;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bg: #fbfaf6;
    --bg-elev: #ffffff;
    --fg: #1a1c20;
    --fg-dim: #545962;
    --rule: #e3e0d6;
    --accent: #8a6b14;
    --link: #1a4ea0;
    --link-hover: #000000;
    --code-bg: #f2efe6;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover, a:focus { color: var(--link-hover); }

p { margin: 0 0 1.1em; }

strong { color: var(--fg); }

em { color: var(--fg-dim); font-style: italic; }

code, pre {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

code {
  background: var(--code-bg);
  padding: 1px 6px;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  padding: 14px 16px;
  border-radius: 6px;
  overflow-x: auto;
  border: 1px solid var(--rule);
}
pre code { background: transparent; padding: 0; }

blockquote {
  border-left: 3px solid var(--accent);
  margin: 1.2em 0;
  padding: 0.2em 1em;
  color: var(--fg-dim);
}

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2.5em 0;
}

/* Skip link */
.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #000;
  padding: 6px 12px;
  z-index: 100;
}
.skip:focus { left: 12px; top: 12px; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(140%) blur(6px);
}
.site-header .wrap {
  max-width: var(--max-wide);
  display: flex;
  align-items: center;
  gap: 18px;
  padding-top: 14px;
  padding-bottom: 14px;
  flex-wrap: wrap;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--fg);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand .mark {
  color: var(--accent);
  font-size: 1.2em;
  line-height: 1;
}
.brand-text { font-size: 0.98em; }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 18px;
  margin-left: auto;
  font-size: 0.92em;
}
.site-nav a {
  color: var(--fg-dim);
  text-decoration: none;
}
.site-nav a:hover, .site-nav a:focus {
  color: var(--fg);
  text-decoration: underline;
  text-underline-offset: 4px;
}

#theme-toggle {
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--fg-dim);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
  font-size: 1.05em;
  line-height: 1;
}
#theme-toggle:hover { color: var(--fg); border-color: var(--fg-dim); }

/* Hero */
.hero {
  padding: 64px 0 36px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 36px;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78em;
  color: var(--accent);
  margin: 0 0 14px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3rem);
  line-height: 1.1;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
.lede {
  font-size: 1.12em;
  color: var(--fg);
  max-width: 60ch;
}
.meta {
  color: var(--fg-dim);
  font-size: 0.92em;
}
.cta { margin-top: 22px; display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 6px;
  background: var(--accent);
  color: #0d0f12;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95em;
  border: 1px solid var(--accent);
}
.btn:hover { color: #0d0f12; filter: brightness(1.08); }
.btn.ghost {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--rule);
}
.btn.ghost:hover { border-color: var(--fg); color: var(--fg); }

/* Article */
article h2 {
  font-size: 1.7rem;
  margin: 1.6em 0 0.5em;
  letter-spacing: -0.01em;
}
article h3 {
  font-size: 1.2rem;
  margin: 1.8em 0 0.4em;
  color: var(--fg);
}
article h2, article h3 { scroll-margin-top: 80px; }

.principles {
  list-style: none;
  padding: 0;
  margin: 1em 0 2em;
  counter-reset: principle;
}
.principles > li {
  counter-increment: principle;
  position: relative;
  margin: 0 0 1.4em;
  padding: 14px 16px 14px 56px;
  border-left: 2px solid var(--rule);
  background: var(--bg-elev);
  border-radius: 0 6px 6px 0;
  scroll-margin-top: 80px;
}
.principles > li::before {
  content: counter(principle);
  position: absolute;
  left: 14px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--accent);
  font-weight: 700;
  width: 28px;
  text-align: right;
}
.principles > li strong {
  display: block;
  font-size: 1.05em;
  margin-bottom: 6px;
}
.principles > li p { margin: 0; color: var(--fg-dim); }

/* Anchor links on hover */
.anchor-link {
  opacity: 0;
  margin-left: 8px;
  font-size: 0.7em;
  color: var(--fg-dim);
  text-decoration: none;
  transition: opacity 0.15s;
}
h2:hover .anchor-link, h3:hover .anchor-link, li:hover > .anchor-link { opacity: 1; }

/* Badge block */
.badge-block {
  margin: 3em 0;
  padding: 18px 20px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--bg-elev);
}
.badge-block h3 { margin-top: 0; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: 4em;
  padding: 28px 0;
  color: var(--fg-dim);
  font-size: 0.88em;
}
.site-footer .wrap { max-width: var(--max-wide); }
.site-footer p { margin: 0 0 6px; }
.site-footer .mark { color: var(--accent); }

/* Tables */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0 1.5em;
  font-size: 0.95em;
}
th, td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
th {
  color: var(--fg);
  font-weight: 600;
  background: var(--bg-elev);
}

/* Print */
@media print {
  :root { --bg: #fff; --fg: #111; --fg-dim: #444; --rule: #ccc; --bg-elev: #fff; --code-bg: #f4f4f4; --accent: #444; }
  .site-header, .site-footer, #theme-toggle, .cta, .skip { display: none; }
  body { font-size: 11pt; }
  .hero { border: none; padding: 0 0 1em; margin-bottom: 1em; }
  a { color: inherit; text-decoration: none; }
  .principles > li { background: none; border-left: none; padding-left: 0; }
  .principles > li::before { position: static; display: inline-block; margin-right: 8px; }
  pre, code { background: #f4f4f4; }
}

/* Small screens */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .site-header .wrap { gap: 10px; }
  .site-nav { width: 100%; order: 3; gap: 10px 14px; font-size: 0.88em; }
  #theme-toggle { margin-left: auto; }
  .hero { padding: 36px 0 24px; }
  .principles > li { padding-left: 48px; }
}