/* ==========================================================================
   dipshitos.css — DipshitOS documentation theme
   "Modern OS documentation crossed with an old technical manual."

   Dark-first · phosphor-green accent · restrained test-lab / Apple-hardware
   cues · no remote webfonts · no JavaScript requirement · responsive.

   Slots this stylesheet targets are emitted by the Boris theme contract:
   site-nav, breadcrumb, page-toc, page-children, page-metadata, admonition,
   details. See docs/contracts/templating-and-themes.md in the Boris repo.
   ========================================================================== */

:root {
  /* Surfaces — anchored to the kernel's own terminal palette (0x101418). */
  --bg: #0d1117;
  --bg-elevated: #12171d;
  --bg-header: #0a0d11;
  --surface: #161b22;
  --surface-hover: #1c222b;
  --border: #2a313c;
  --border-strong: #3a4350;

  /* Text */
  --text: #d8dee6;
  --text-bright: #f0f3f6;
  --text-muted: #8b98a6;
  --text-faint: #5c6875;

  /* Accents — diagnostic phosphor green + Driving Award amber + lab red/blue. */
  --green: #57e08a;
  --green-dim: #2c7a4a;
  --green-ink: #0b1f13;
  --amber: #e0a93e;
  --amber-dim: #7a5a1e;
  --blue: #5aa7f0;
  --blue-dim: #1f4a70;
  --red: #f26d62;
  --red-dim: #7a2f2a;

  /* Typography — local system fonts only. */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", "Courier New", monospace;

  --maxw: 76rem;
  --radius: 4px;
}

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

html {
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  text-rendering: optimizeLegibility;
}

/* ------------------------------------------------------------------ links */
a {
  color: var(--green);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--green);
  color: var(--green-ink);
  font-weight: 600;
}

.skip-link:focus {
  left: 0;
  text-decoration: none;
}

/* ----------------------------------------------------------------- header */
.site-header {
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.4rem 1.25rem 0;
}

.brand__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green);
}

.brand__name {
  margin: 0.15rem 0 0;
  font-family: var(--font-mono);
  font-size: 2.1rem;
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand__name a {
  color: var(--text-bright);
}

.brand__name a:hover {
  text-decoration: none;
  color: var(--green);
}

.brand__tagline {
  margin: 0.35rem 0 0;
  max-width: 46rem;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.primary-nav {
  margin-top: 1rem;
  overflow-x: auto;
}

.primary-nav ul {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.25rem;
  margin: 0;
  padding: 0 0 0.75rem;
  list-style: none;
}

.primary-nav a {
  display: block;
  padding: 0.45rem 0.7rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 0.9rem;
  white-space: nowrap;
}

.primary-nav a:hover {
  color: var(--text-bright);
  border-color: var(--border-strong);
  text-decoration: none;
}

/* ----------------------------------------------------------------- layout */
.layout {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 17rem;
  gap: 2rem;
  align-items: start;
}

.content {
  min-width: 0;
}

.article > :first-child {
  margin-top: 0.4rem;
}

/* ------------------------------------------------------------ typography */
h1, h2, h3, h4 {
  color: var(--text-bright);
  line-height: 1.25;
  font-weight: 650;
}

h1 {
  font-size: 1.9rem;
  margin: 0.3rem 0 1rem;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.35rem;
  margin: 2.2rem 0 0.7rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: 1.08rem;
  margin: 1.6rem 0 0.5rem;
}

h4 {
  font-size: 0.98rem;
  margin: 1.2rem 0 0.4rem;
}

p {
  margin: 0.7rem 0;
}

strong {
  color: var(--text-bright);
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* -------------------------------------------------------------- code */
code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.12em 0.35em;
  color: var(--green);
}

pre {
  background: var(--bg-header);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
}

pre code {
  background: none;
  border: 0;
  padding: 0;
  color: var(--text);
}

/* ------------------------------------------------------------- tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.92rem;
  display: block;
  overflow-x: auto;
}

thead {
  border-bottom: 2px solid var(--border-strong);
}

th, td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  color: var(--text-bright);
  font-weight: 650;
}

tbody tr:hover {
  background: var(--surface);
}

/* -------------------------------------------------------------- images */
img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

figure {
  margin: 1.4rem 0;
}

figure img {
  display: block;
}

figcaption {
  margin-top: 0.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* -------------------------------------------------------- admonitions */
.admonition {
  margin: 1.2rem 0;
  border: 1px solid var(--border-strong);
  border-left: 4px solid var(--text-muted);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  padding: 0.15rem 0.9rem 0.4rem;
}

.admonition__title {
  margin: 0.55rem 0 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.admonition__body > :first-child {
  margin-top: 0.35rem;
}

.admonition__body > :last-child {
  margin-bottom: 0.6rem;
}

.admonition--note {
  border-left-color: var(--text-muted);
}

.admonition--tip {
  border-left-color: var(--green);
}

.admonition--tip .admonition__title {
  color: var(--green);
}

.admonition--info {
  border-left-color: var(--blue);
}

.admonition--info .admonition__title {
  color: var(--blue);
}

.admonition--warning {
  border-left-color: var(--amber);
}

.admonition--warning .admonition__title {
  color: var(--amber);
}

.admonition--danger {
  border-left-color: var(--red);
}

.admonition--danger .admonition__title {
  color: var(--red);
}

/* ------------------------------------------------------------ details */
.details {
  margin: 1.1rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
}

.details summary {
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  color: var(--text-bright);
  font-weight: 600;
}

.details summary:hover {
  background: var(--surface-hover);
}

.details__body {
  padding: 0.1rem 0.9rem 0.6rem;
  border-top: 1px solid var(--border);
}

/* ------------------------------------------------------- breadcrumb */
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.3rem;
  color: var(--text-faint);
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--green);
}

/* ---------------------------------------------------------- children */
.children {
  margin-top: 1.5rem;
}

.page-children {
  border-top: 1px solid var(--border);
  padding-top: 0.75rem;
}

.page-children ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-children li {
  margin: 0.3rem 0;
}

/* --------------------------------------------------------- metadata */
.page-metadata {
  margin: 1.4rem 0 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.page-metadata > div {
  margin: 0.2rem 0;
}

.page-metadata dt {
  display: inline;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.7rem;
  color: var(--text-faint);
}

.page-metadata dd {
  display: inline;
  margin: 0 0 0 0.6rem;
}

/* ----------------------------------------------------------- sidebar */
.sidebar {
  position: sticky;
  top: 1rem;
  font-size: 0.88rem;
}

.sidebar__block {
  margin-bottom: 1.6rem;
  padding: 0.9rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.sidebar__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
}

/* site-nav (Boris forest) */
.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav > ul > li {
  margin: 0.35rem 0;
}

.site-nav__trunk > a {
  color: var(--text-bright);
  font-weight: 600;
}

.site-nav__satellite {
  margin: 0.15rem 0 0.15rem 0.8rem;
}

.site-nav__satellite a {
  color: var(--text-muted);
}

.site-nav a:hover {
  color: var(--green);
}

.site-nav .is-current > a {
  color: var(--green);
}

.site-nav .is-ancestor > a {
  color: var(--text);
}

.site-nav ul ul {
  margin: 0.1rem 0 0.3rem 0.9rem;
  border-left: 1px solid var(--border);
  padding-left: 0.6rem;
}

/* page-toc */
.page-toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-toc li {
  margin: 0.25rem 0;
}

.page-toc a {
  color: var(--text-muted);
}

.page-toc a:hover {
  color: var(--green);
}

.page-toc__l2 {
  padding-left: 0.8rem;
}

.page-toc__l3 {
  padding-left: 1.6rem;
  font-size: 0.84rem;
}

/* ------------------------------------------------------------ footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-header);
}

.site-footer {
  padding: 1.6rem 1.25rem 2rem;
}

.site-footer > * {
  max-width: var(--maxw);
  margin-left: auto;
  margin-right: auto;
}

.site-footer__line {
  margin: 0;
  color: var(--text);
  font-size: 0.9rem;
}

.site-footer__meta {
  margin: 0.4rem 0 0;
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* --------------------------------------------------------- responsive */
@media (max-width: 62rem) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    position: static;
    order: 2;
  }
}

@media (max-width: 40rem) {
  .brand__name {
    font-size: 1.7rem;
  }

  h1 {
    font-size: 1.6rem;
  }

  .layout {
    padding: 1.1rem 1rem 2.5rem;
  }

  table {
    font-size: 0.84rem;
  }
}

/* Respect users who prefer reduced motion. */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}