@import url('https://rsms.me/inter/inter.css');
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  --font-sans: "InterVariable", "Inter", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --zinc-50: #fafafa;
  --zinc-100: #f4f4f5;
  --zinc-200: #e4e4e7;
  --zinc-300: #d4d4d8;
  --zinc-400: #a1a1aa;
  --zinc-500: #71717a;
  --zinc-600: #52525b;
  --zinc-700: #3f3f46;
  --zinc-800: #27272a;
  --zinc-900: #18181b;
  --zinc-950: #09090b;

  --orange-400: #fb923c;
  --orange-600: #ea580c;

  --bg: #ffffff;
  --bg-well: var(--zinc-100);
  --ink: var(--zinc-900);
  --ink-muted: var(--zinc-600);
  --ink-faint: var(--zinc-500);
  --accent: var(--orange-600);
  --border: rgb(9 9 11 / 8%);
  --border-strong: rgb(9 9 11 / 14%);
  --focus-ring: #2563eb;
  --search-backdrop: rgb(9 9 11 / 40%);
}

/* Default: follow the OS preference. The [data-theme] rule below lets
   assets/theme-toggle.js override that choice explicitly; :not([data-theme="light"])
   keeps an explicit light override winning even when the OS prefers dark. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: var(--zinc-950);
    --bg-well: var(--zinc-900);
    --ink: var(--zinc-100);
    --ink-muted: var(--zinc-400);
    --ink-faint: var(--zinc-500);
    --accent: var(--orange-400);
    --border: rgb(255 255 255 / 10%);
    --border-strong: rgb(255 255 255 / 16%);
    --search-backdrop: rgb(0 0 0 / 60%);
  }
}

:root[data-theme="dark"] {
  --bg: var(--zinc-950);
  --bg-well: var(--zinc-900);
  --ink: var(--zinc-100);
  --ink-muted: var(--zinc-400);
  --ink-faint: var(--zinc-500);
  --accent: var(--orange-400);
  --border: rgb(255 255 255 / 10%);
  --border-strong: rgb(255 255 255 / 16%);
  --search-backdrop: rgb(0 0 0 / 60%);
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 90rem;
  margin: 0 auto;
  padding: var(--space-4) var(--space-4);
  display: grid;
  grid-template-columns: auto 1fr auto;
  column-gap: var(--space-4);
  align-items: center;
}

.wordmark {
  grid-column: 1;
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
}

.wordmark span {
  color: var(--accent);
}

/* Mirrors the sidebar/toc widths below (see .sidebar, .toc) so the search
   box's center lines up with the prose column, not the full topbar width. */
.topbar-search {
  grid-column: 2;
  justify-self: center;
  width: 100%;
  max-width: 20rem;
}

.search-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background: var(--bg-well);
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--ink-faint);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  text-align: left;
  cursor: pointer;
}

.search-trigger:hover {
  color: var(--ink-muted);
}

.search-trigger-icon {
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
}

.search-trigger-text {
  flex: 1;
}

.search-trigger-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
}

.search-dialog-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--search-backdrop);
  padding: 10vh var(--space-4) var(--space-8);
  overflow-y: auto;
}

.search-dialog-backdrop.is-open {
  display: block;
}

.search-dialog {
  max-width: 34rem;
  margin: 0 auto;
  background: var(--bg);
  border-radius: var(--radius-lg);
  box-shadow: 0 1rem 3rem rgb(9 9 11 / 20%);
  overflow: hidden;
}

.search-dialog-form {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border-bottom: 1px solid var(--border);
}

.search-dialog-icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
  color: var(--ink-faint);
}

.search-dialog-input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: none;
  background: none;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
}

.search-dialog-input::placeholder {
  color: var(--ink-faint);
}

.search-dialog-results {
  max-height: 22rem;
  overflow-y: auto;
  padding: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.search-result {
  display: flex;
  flex-direction: column;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  text-decoration: none;
}

.search-result[aria-selected="true"] {
  background: var(--bg-well);
}

.search-result-path {
  font-size: 0.75rem;
  color: var(--ink-faint);
}

.search-result-title {
  font-size: 0.9375rem;
  color: var(--ink);
}

.search-result-title mark {
  background: none;
  color: var(--accent);
}

.search-dialog-empty {
  margin: 0;
  padding: var(--space-8) var(--space-4);
  text-align: center;
  font-size: 0.875rem;
  color: var(--ink-faint);
}

.search-dialog-footer {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--ink-faint);
}

body.search-open {
  overflow: hidden;
}

.topbar-links {
  grid-column: 3;
  justify-self: end;
  display: none;
  align-items: center;
  gap: var(--space-6);
}

.topbar-link {
  display: flex;
  align-items: center;
  color: var(--ink-muted);
  text-decoration: none;
}

.topbar-link:hover {
  color: var(--ink);
}

.link-icon {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

/* Toggled by assets/theme-toggle.js, which sets data-theme on <html> and
   mirrors the override into localStorage. Shows the icon for the theme a
   click would switch *to* — moon while light, sun while dark. */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  background: none;
  padding: 0;
  color: var(--ink-muted);
  cursor: pointer;
}

.theme-toggle:hover {
  color: var(--ink);
}

.theme-toggle svg {
  width: 1.25rem;
  height: 1.25rem;
}

.theme-toggle .icon-sun {
  display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

:root[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun {
    display: block;
  }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon {
    display: none;
  }
}

.menu-btn {
  grid-column: 3;
  justify-self: end;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  color: var(--ink);
  cursor: pointer;
}

.menu-btn svg {
  width: 1.5rem;
  height: 1.5rem;
}

.menu-btn .icon-close {
  display: none;
}

.nav-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

@media (min-width: 64rem) {
  .topbar-inner {
    padding: var(--space-4) var(--space-8);
    /* 17rem matches .sidebar's width exactly, so the search column below
       lines up with .content instead of the full-width topbar. */
    grid-template-columns: 17rem 1fr auto;
    column-gap: 0;
  }
  .topbar-links {
    display: flex;
  }
  .menu-btn {
    display: none;
  }
}

/* ---------- Shell (sidebar / content / toc) ---------- */

.shell {
  max-width: 90rem;
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
}

.scrim {
  display: none;
}

.sidebar {
  display: none;
  flex-shrink: 0;
  width: 17rem;
  padding: var(--space-8) var(--space-6);
  position: sticky;
  top: 3.75rem;
  max-height: calc(100dvh - 3.75rem);
  overflow-y: auto;
}

.sidebar-heading {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
}

.chapter-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.chapter-list a {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-left: 2px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  color: var(--ink-muted);
  text-decoration: none;
}

.chapter-list a:hover {
  background: var(--bg-well);
  color: var(--ink);
}

.chapter-list a[aria-current="page"] {
  border-left-color: var(--accent);
  color: var(--ink);
}

.content {
  flex: 1;
  min-width: 0;
  padding: var(--space-10) var(--space-4) var(--space-20);
}

.content-inner {
  max-width: 72ch;
  margin: 0 auto;
}

.toc {
  display: none;
  flex-shrink: 0;
  width: 15rem;
  padding: var(--space-10) var(--space-6);
  position: sticky;
  top: 3.75rem;
  max-height: calc(100dvh - 3.75rem);
  overflow-y: auto;
}

.toc-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
}

.toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  border-left: 1px solid var(--border);
}

.toc a {
  display: block;
  padding: var(--space-1) 0 var(--space-1) var(--space-4);
  margin-left: -1px;
  border-left: 1px solid transparent;
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--ink-faint);
  text-decoration: none;
}

.toc a:hover {
  color: var(--ink);
  border-left-color: var(--border-strong);
}

/* Set by assets/toc-scrollspy.js as the user scrolls past each heading. */
.toc a[aria-current="location"] {
  color: var(--ink);
  border-left-color: var(--accent);
}

@media (min-width: 64rem) {
  .sidebar {
    display: block;
  }
  .content {
    padding: var(--space-12) var(--space-10) var(--space-20);
  }
}

@media (min-width: 80rem) {
  .toc {
    display: block;
  }
  /* 15rem matches .toc's width, completing the mirror of the shell's
     three columns so the search box centers on .content-inner. */
  .topbar-inner {
    grid-template-columns: 17rem 1fr 15rem;
  }
}

/* Mobile nav drawer, via checkbox toggle (no JS) */
@media (max-width: 63.9375rem) {
  #nav-toggle:checked ~ .topbar .icon-open {
    display: none;
  }
  #nav-toggle:checked ~ .topbar .icon-close {
    display: block;
  }
  #nav-toggle:checked ~ .shell .scrim {
    display: block;
    position: fixed;
    inset: 0;
    top: 3.75rem;
    z-index: 20;
    background: rgb(9 9 11 / 40%);
  }
  #nav-toggle:checked ~ .shell .sidebar {
    display: block;
    position: fixed;
    top: 3.75rem;
    left: 0;
    bottom: 0;
    z-index: 21;
    background: var(--bg);
    border-right: 1px solid var(--border);
    width: 17.5rem;
    max-width: 82vw;
  }
}

/* ---------- Prose ---------- */

.prose {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ink-muted);
}

.prose > * + * {
  margin-top: var(--space-5);
}

.page-title {
  font-size: 2.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 var(--space-8);
  text-wrap: balance;
}

.prose h2 {
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-top: var(--space-12);
  margin-bottom: 0;
  text-wrap: balance;
  scroll-margin-top: 5rem;
}

.prose h2 + * {
  margin-top: var(--space-4);
}

.prose h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--ink);
  margin-top: var(--space-8);
  margin-bottom: 0;
  scroll-margin-top: 5rem;
}

.prose h3 + * {
  margin-top: var(--space-3);
}

.prose p {
  text-wrap: pretty;
}

.prose a {
  color: var(--accent);
  text-decoration-line: underline;
  text-decoration-color: rgb(234 88 12 / 35%);
  text-underline-offset: 2px;
}

.prose a:hover {
  text-decoration-color: currentColor;
}

.prose strong {
  font-weight: 600;
  color: var(--ink);
}

.prose ul,
.prose ol {
  padding-left: 1.25em;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.prose li {
  padding-left: 0.25em;
}

.prose li::marker {
  color: var(--ink-faint);
}

.prose li > p {
  margin: 0;
}

.prose li > ul,
.prose li > ol {
  margin-top: var(--space-2);
}

.prose :not(pre) > code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-well);
  border-radius: 4px;
  padding: 0.15em 0.4em;
  color: var(--ink);
}

.code-block {
  position: relative;
  /* Fixed, not var(--bg-well): the Torchlight theme is always github-dark
     (see docs/bin/build-docs.php), so the block must stay dark even when
     the surrounding site is in light mode. */
  background: #24292e;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.code-block .code-lang {
  position: absolute;
  top: var(--space-3);
  right: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}

.prose pre {
  margin: 0;
  padding: var(--space-5) var(--space-5);
  overflow-x: auto;
}

.prose pre code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--ink);
  background: none;
  padding: 0;
  border-radius: 0;
}

/* Plain (non-highlighted) blocks have no per-token Torchlight color, so
   they inherit this — fixed light gray, not var(--ink), to stay readable
   against .code-block's fixed dark background regardless of site theme. */
.code-block pre code {
  color: #e1e4e8;
}

.table-wrap {
  overflow-x: auto;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.prose th {
  text-align: left;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  padding: var(--space-2) var(--space-4) var(--space-2) 0;
  border-bottom: 1px solid var(--border-strong);
}

.prose td {
  padding: var(--space-3) var(--space-4) var(--space-3) 0;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.prose td code,
.prose th code {
  white-space: nowrap;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-8) 0;
}

/* ---------- Pager ---------- */

.pager {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: var(--space-16);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
}

.pager-link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  text-decoration: none;
  max-width: 48%;
}

.pager-link.next {
  align-items: flex-end;
  text-align: right;
  margin-left: auto;
}

.pager-direction {
  font-size: 0.75rem;
  color: var(--ink-faint);
}

.pager-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink);
}

.pager-link:hover .pager-title {
  color: var(--accent);
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 90rem;
  margin: 0 auto;
  padding: var(--space-8) var(--space-4);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-6);
  font-size: 0.875rem;
  color: var(--ink-faint);
}

.footer-inner a {
  display: flex;
  align-items: center;
  color: var(--ink-muted);
  text-decoration: none;
}

.footer-inner a:hover {
  color: var(--ink);
}

.footer-spacer {
  margin-left: auto;
}

@media (min-width: 64rem) {
  .footer-inner {
    padding: var(--space-8) var(--space-8);
  }
}