/* termin.dev — main stylesheet * * Research-paper aesthetic. Typography-first. Light mode defaults; dark mode * via [data-theme="dark"] on . No animations, no gradients, no flash. * * WCAG AA contrast verified on all text/background pairs. */ /* ── Theme tokens ─────────────────────────────────────────────────────── */ :root { /* Light mode */ --bg: #fdfdfc; --fg: #14131a; --fg-muted: #55525e; --fg-subtle: #7a7683; --border: #e4e1dc; --border-strong: #c8c4bd; --accent: #2a5486; --accent-hover: #1a3a5f; --code-bg: #f4f2ed; --code-fg: #14131a; --callout-bg: #f8f5f0; --selection: #d7e4f2; } html[data-theme="dark"] { --bg: #14131a; --fg: #e7e4dc; --fg-muted: #a29c8f; --fg-subtle: #7a7683; --border: #2a2832; --border-strong: #403c47; --accent: #8fb1dc; --accent-hover: #b5cdee; --code-bg: #1d1c25; --code-fg: #e7e4dc; --callout-bg: #1a1922; --selection: #2a4066; } /* ── Base typography ──────────────────────────────────────────────────── */ *, *::before, *::after { box-sizing: border-box; } html { font-size: 17px; -webkit-text-size-adjust: 100%; text-rendering: optimizeLegibility; } body { margin: 0; background: var(--bg); color: var(--fg); font-family: "Iowan Old Style", "Charter", "Georgia", "Times New Roman", serif; line-height: 1.65; font-feature-settings: "kern", "liga", "onum"; } ::selection { background: var(--selection); } h1, h2, h3, h4, h5, h6 { font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif; line-height: 1.25; letter-spacing: -0.01em; color: var(--fg); margin-top: 2.5rem; margin-bottom: 1rem; font-weight: 600; } h1 { font-size: 2.1rem; margin-top: 0; letter-spacing: -0.02em; } h2 { font-size: 1.55rem; } h3 { font-size: 1.2rem; } h4 { font-size: 1rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--fg-muted); } p, ul, ol, blockquote { margin-top: 0; margin-bottom: 1.2rem; } ul, ol { padding-left: 1.4rem; } li { margin-bottom: 0.35rem; } a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 0.06em; text-underline-offset: 0.15em; transition: color 0.08s ease; } a:hover, a:focus-visible { color: var(--accent-hover); } a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; } hr { border: none; border-top: 1px solid var(--border); margin: 2.5rem 0; } /* ── Code ─────────────────────────────────────────────────────────────── */ code, pre, kbd, samp { font-family: "SF Mono", "Menlo", "Monaco", "Cascadia Mono", "Consolas", monospace; font-size: 0.9em; } :not(pre) > code { background: var(--code-bg); color: var(--code-fg); padding: 0.12em 0.35em; border-radius: 3px; font-size: 0.88em; } pre { background: var(--code-bg); color: var(--code-fg); padding: 1rem 1.2rem; border-radius: 4px; overflow-x: auto; line-height: 1.55; border: 1px solid var(--border); margin-bottom: 1.5rem; } pre code { background: transparent; padding: 0; font-size: 0.92em; } /* ── Layout ───────────────────────────────────────────────────────────── */ .container { max-width: 44rem; margin: 0 auto; padding: 0 1.25rem; } main.container { padding-top: 2.5rem; padding-bottom: 4rem; min-height: calc(100vh - 9rem); } .skip-link { position: absolute; left: -9999px; top: auto; width: 1px; height: 1px; overflow: hidden; } .skip-link:focus { position: static; width: auto; height: auto; padding: 0.5rem 1rem; background: var(--accent); color: #fff; } /* ── Header ───────────────────────────────────────────────────────────── */ .site-header { border-bottom: 1px solid var(--border); padding: 1rem 0; background: var(--bg); } .header-inner { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; } .wordmark { font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif; font-weight: 700; font-size: 1.1rem; color: var(--fg); text-decoration: none; letter-spacing: -0.01em; } .wordmark:hover { color: var(--accent); } .site-nav { flex: 1; } .site-nav ul { display: flex; gap: 1.25rem; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; } .site-nav a { font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif; font-size: 0.9rem; color: var(--fg-muted); text-decoration: none; } .site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--fg); } .site-nav a[aria-current="page"] { text-decoration: underline; text-decoration-thickness: 0.08em; text-underline-offset: 0.3em; } .theme-toggle { font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif; font-size: 0.85rem; background: transparent; border: 1px solid var(--border-strong); color: var(--fg-muted); padding: 0.35rem 0.75rem; border-radius: 3px; cursor: pointer; } .theme-toggle:hover { color: var(--fg); border-color: var(--fg-muted); } .theme-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; } /* ── Footer ───────────────────────────────────────────────────────────── */ .site-footer { border-top: 1px solid var(--border); padding: 1.75rem 0; margin-top: 4rem; color: var(--fg-muted); font-size: 0.9rem; } .footer-inner { display: flex; flex-direction: column; gap: 1rem; } .footer-nav ul { display: flex; gap: 1rem; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; } .footer-nav a { font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif; color: var(--fg-muted); text-decoration: none; } .footer-nav a:hover { color: var(--fg); text-decoration: underline; } .maintainer { margin: 0; font-size: 0.85rem; color: var(--fg-subtle); font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif; } /* ── Heading anchors ──────────────────────────────────────────────────── */ /* markdown-it-anchor adds an invisible-by-default anchor link before each heading. Surface it on hover for "copy link to section" behavior. */ .heading-anchor { color: var(--fg-subtle); text-decoration: none; margin-right: 0.4rem; opacity: 0; transition: opacity 0.1s ease; font-weight: 400; } h2:hover .heading-anchor, h3:hover .heading-anchor, h4:hover .heading-anchor, .heading-anchor:focus { opacity: 1; } /* Scroll offset for hash-jump: account for sticky header. */ h2[id], h3[id], h4[id] { scroll-margin-top: 5rem; } /* ── Table of contents (opt-in via `toc: true` in frontmatter) ─────────── */ .page-with-toc { display: grid; grid-template-columns: 1fr minmax(0, 44rem) 1fr; gap: 2rem; max-width: 80rem; margin: 0 auto; padding: 0 1.25rem; } .page-with-toc > main { grid-column: 2; padding-top: 2.5rem; padding-bottom: 4rem; min-width: 0; /* allows 
 to overflow-x without breaking grid */
}

.toc-sidebar {
  grid-column: 1;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 0.85rem;
  padding-top: 2.5rem;
}

.toc-desktop {
  position: sticky;
  top: 5rem;
  max-height: calc(100vh - 7rem);
  overflow-y: auto;
  padding-right: 1rem;
}

.toc-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-subtle);
  margin: 0 0 0.75rem;
  font-weight: 600;
}

.toc-mobile-toggle { display: none; }

.toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.toc > ul > li > ul { padding-left: 0.9rem; }
.toc li { margin: 0.1rem 0; }
.toc a {
  display: block;
  color: var(--fg-muted);
  text-decoration: none;
  padding: 0.2rem 0.4rem;
  border-left: 2px solid transparent;
  line-height: 1.3;
}
.toc a:hover {
  color: var(--fg);
  background: var(--code-bg);
}
.toc a.toc-active {
  color: var(--fg);
  border-left-color: var(--accent);
  font-weight: 600;
  background: var(--code-bg);
}

/* ── Responsive ───────────────────────────────────────────────────────── */

@media (max-width: 64rem) {
  /* Tablet: drop the TOC sidebar and use the mobile collapsed form. */
  .page-with-toc {
    display: block;
    max-width: 44rem;
  }
  .page-with-toc > main { padding: 2.5rem 0 4rem; }
  .toc-sidebar { padding-top: 1.5rem; }
  .toc-desktop { display: none; }
  .toc-mobile-toggle {
    display: block;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.5rem 0.75rem;
    margin-bottom: 1.5rem;
    background: var(--bg);
  }
  .toc-mobile-toggle > summary {
    cursor: pointer;
    color: var(--fg-muted);
    font-size: 0.85rem;
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    list-style: none;
  }
  .toc-mobile-toggle > summary::-webkit-details-marker { display: none; }
  .toc-mobile-toggle > summary::before {
    content: "▸ ";
    display: inline-block;
    transition: transform 0.1s ease;
  }
  .toc-mobile-toggle[open] > summary::before {
    transform: rotate(90deg);
  }
  .toc-mobile-toggle .toc { margin-top: 0.75rem; }
}

@media (max-width: 42rem) {
  html { font-size: 16px; }
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.35rem; }
  .header-inner { gap: 0.75rem; }
  .site-nav ul { gap: 0.85rem; }
  .theme-toggle { order: 99; }
}

/* ── Print ────────────────────────────────────────────────────────────── */

@media print {
  html { font-size: 11pt; }
  body { background: #fff; color: #000; }
  .site-nav, .theme-toggle, .skip-link, .toc-sidebar { display: none; }
  .page-with-toc { display: block; max-width: none; }
  a { color: inherit; text-decoration: underline; }
  a::after { content: " (" attr(href) ")"; font-size: 0.8em; color: #444; }
  pre, code { background: #f4f2ed; }
}