:root {
  --bg: #fafaf7;
  --surface: #f0f1ea;
  --text: #0d0f0a;
  --muted: #5c6152;
  --border: #e1e3d8;
  /* Lime is too light for text on white: use it for fills and underlines */
  --accent: #b8f02a;
  --on-accent: #0d0f0a;
  /* Violet from the logo (the bulb) for decorative lines; green for link text */
  --line: #7a5cff;
  /* Syntax highlighting, from the logo's palette */
  --code-keyword: #3f2aa8;
  --code-type: #3f6b00;
  --code-literal: #9a4a0b;
  --code-comment: #6b6f60;
  --accent-text: #3f6b00;

  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --measure: 42rem;
  --gutter: clamp(1rem, 4vw, 2rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0c08;
    --surface: #16180f;
    --text: #f2f5e8;
    --muted: #9ba08c;
    --border: #272a1d;
    --accent: #c6ff3a;
    --on-accent: #0b0c08;
    --line: #9a84ff;
    --code-keyword: #b8a9ff;
    --code-type: #c6ff3a;
    --code-literal: #ffb37a;
    --code-comment: #8f947f;
    --accent-text: #d4ff66;
  }
}

*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 1.0625rem/1.65 var(--font-sans);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: var(--accent-text);
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.2em;
}
a:hover { color: var(--text); }

::selection { background: var(--accent); color: var(--on-accent); }


img { max-width: 100%; height: auto; }

/* Header */

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  max-width: 64rem;
  width: 100%;
  margin: 0 auto;
  padding: 1.25rem var(--gutter);
  border-bottom: 2px solid var(--line);
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text);
  text-decoration: none;
}
.site-header__brand { --logo-height: clamp(3.5rem, 9vw, 4.5rem); }
.site-header__logo {
  display: block;
  height: var(--logo-height);
  width: auto;
}
.site-header__tagline {
  /* The bulb sticks up above the word, so the word's middle sits ~10.6% of the
     logo's height below the image's middle: line the tagline up with the word */
  position: relative;
  top: calc(var(--logo-height) * 0.106);
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.3;
  max-width: 9rem;
}

.site-nav { display: flex; gap: 1.5rem; }
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 0.25rem;
  border-bottom: 3px solid transparent;
}
.site-nav a:hover { color: var(--text); }
.site-nav a[aria-current="page"] {
  color: var(--text);
  border-bottom-color: var(--line);
}

/* Layout */

.layout {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 15rem;
  gap: 3rem;
  max-width: 64rem;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem var(--gutter) 3rem;
}
.layout--wide { grid-template-columns: minmax(0, 1fr); }

@media (max-width: 48rem) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 2.5rem; }
}

.main { max-width: var(--measure); }

/* Sidebar profile */

.profile {
  text-align: center;
  padding: 1.5rem;
  background: var(--surface);
  border-radius: 12px;
}
.profile__picture {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
}
.profile__name { font-size: 1.125rem; margin: 0.75rem 0 0; }
.profile__title { color: var(--muted); margin: 0 0 1rem; font-size: 0.9375rem; }
.profile__links {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9375rem;
  line-height: 2;
  overflow-wrap: anywhere;
}

/* Page and post headers */

.page-header { margin-bottom: 2rem; }
.page-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.2;
  margin: 0;
}
.tagline { color: var(--muted); font-style: italic; margin: 0.25rem 0 0; }

.meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.875rem;
  margin: 0 0 0.5rem;
}
.tag {
  padding: 0 0.5rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8125rem;
}

/* Long-form content */

.prose > :first-child { margin-top: 0; }
.prose h2 { font-size: 1.5rem; line-height: 1.3; margin: 2.5rem 0 0.75rem; }
.prose h3 { font-size: 1.2rem; margin: 2rem 0 0.5rem; }
.prose li { margin: 0.4rem 0; }
.prose li > p { margin: 0; }
.prose a { overflow-wrap: anywhere; }
.prose img { display: block; border-radius: 8px; border: 1px solid var(--border); }
.prose blockquote {
  margin: 1.5rem 0;
  padding-left: 1rem;
  border-left: 3px solid var(--line);
  color: var(--muted);
}
.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--surface);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
.prose pre {
  background: var(--surface);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  line-height: 1.5;
}
.prose pre code { background: none; padding: 0; }

/* Rouge token classes (Jekyll's highlighter) */
.highlight .k, .highlight .kd, .highlight .kr, .highlight .kn,
.highlight .kp, .highlight .kc, .highlight .ow { color: var(--code-keyword); }
.highlight .kt, .highlight .nc, .highlight .nn, .highlight .no { color: var(--code-type); }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sc, .highlight .sd,
.highlight .se, .highlight .ss, .highlight .sr,
.highlight .m, .highlight .mi, .highlight .mf, .highlight .mh, .highlight .il { color: var(--code-literal); }
.highlight .c, .highlight .c1, .highlight .cm, .highlight .cs, .highlight .cp { color: var(--code-comment); font-style: italic; }
.highlight .nf, .highlight .fm { font-weight: 600; }
.highlight .err { color: inherit; background: none; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }

.home h2,
.home h3 { font-weight: 800; letter-spacing: -0.03em; }
.home h2:first-child {
  font-size: clamp(2.25rem, 6vw, 3.25rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: 1.25rem;
}

.button {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 2px solid var(--line);
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.button:hover,
.button:focus-visible {
  background: var(--line);
  color: #fff;
}
.button:focus-visible { outline: 3px solid var(--text); outline-offset: 3px; }

/* Post lists */

.post-list { list-style: none; margin: 0; padding: 0; }
.post-list__item { padding: 0 0 2.5rem; margin: 0 0 2.5rem; border-bottom: 1px solid var(--line); }
.post-list__item:last-child { border-bottom: 0; }
.post-list__item time { color: var(--muted); font-size: 0.875rem; }
.post-list__item h2 { font-size: 1.375rem; line-height: 1.3; margin: 0.125rem 0 0; }
.post-list__item h2 a { color: var(--text); text-decoration: none; }
.post-list__item h2 a:hover { color: var(--accent-text); }
.post-list__excerpt { margin-top: 1rem; }
.post-list__more { display: inline-block; margin-top: 0.5rem; font-weight: 600; }

.archive-year { font-size: 1.25rem; margin: 2rem 0 0.5rem; }
.archive-list { list-style: none; margin: 0; padding: 0; }
.archive-list li { display: flex; gap: 1rem; padding: 0.35rem 0; }
.archive-list time { color: var(--muted); font-variant-numeric: tabular-nums; flex: 0 0 4rem; }

/* Previous / next */

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}
.post-nav a { text-decoration: none; color: var(--text); }
.post-nav a:hover { color: var(--accent-text); }
.post-nav span { display: block; color: var(--muted); font-size: 0.875rem; }
.post-nav__next { grid-column: 2; text-align: right; }

/* Footer */

.site-footer {
  max-width: 64rem;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem var(--gutter) 2rem;
  border-top: 2px solid var(--line);   /* matches the header line */
  color: var(--muted);
  font-size: 0.875rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
}
.site-footer p { margin: 0; }
.site-footer a { color: var(--muted); }
.nowrap { white-space: nowrap; }

/* Halftone corner on the profile card: a dot pattern used as a mask, so it takes the theme's violet */

.profile { position: relative; overflow: hidden; }
.profile > * { position: relative; }
.profile::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 7rem;
  height: 7rem;
  background: var(--line);
  opacity: 0.45;
  -webkit-mask: url("../images/halftone-corner.svg") center / contain no-repeat;
  mask: url("../images/halftone-corner.svg") center / contain no-repeat;
  pointer-events: none;
}

.video {
  aspect-ratio: 16 / 9;
  margin: 1.5rem 0;
}

.video iframe {
  width: 100%;
  height: 100%;
  border: 0;
}