/* actor.sh docs — stone palette, mono body, serif headings */

:root {
  /* light (Tailwind stone) */
  --bg:           #f5f5f4; /* stone-100 */
  --surface:      #fafaf9; /* stone-50  */
  --sidebar-bg:   #e7e5e4; /* stone-200 */
  --header-bg:    #f5f5f4;
  --border:       #d6d3d1; /* stone-300 */
  --border-soft:  #e7e5e4; /* stone-200 */
  --fg:           #1c1917; /* stone-900 */
  --fg-strong:    #1c1917;
  --fg-body:      #292524; /* stone-800 */
  --fg-muted:     #44403c; /* stone-700 */
  --fg-soft:      #57534e; /* stone-600 */
  --fg-faint:     #78716c; /* stone-500 */
  --fg-fainter:   #a8a29e; /* stone-400 */
  --inline-bg:    #e7e5e4;
  --inline-fg:    #44403c;
  --code-bg:      #22272e; /* github-dark-dimmed bg */
  --code-fg:      #adbac7; /* github-dark-dimmed fg */
  --code-comment: #768390;
  --code-string:  #96d0ff;
  --code-keyword: #f47067;
  --code-number:  #6cb6ff;
  --code-fn:      #dcbdfb;
  --link:         #0369a1; /* sky-700 */
  --link-hover:   #0c4a6e; /* sky-900 */
  --link-italic:  #0369a1;
  --selection:    rgba(3, 105, 161, 0.18);

  --font-serif: "Newsreader", Georgia, "Times New Roman", serif;
  --font-mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --header-h:    57px;
  --sidebar-w:   16rem;     /* 256px */
  --toc-w:       14rem;     /* 224px */
  --toc-gutter:  2.5rem;    /* gap between content and TOC */
  --content-max: 42rem;     /* ~672px */
  --gutter:      1.5rem;
  --gutter-lg:   3rem;
  --rhythm:      1.5rem;

  color-scheme: light;
}

html[data-theme="dark"] {
  --bg:           #1c1917; /* stone-900 */
  --surface:      #292524; /* stone-800 */
  --sidebar-bg:   #292524;
  --header-bg:    #1c1917;
  --border:       #3f3a36;
  --border-soft:  #2c2925;
  --fg:           #ffffff;
  --fg-strong:    #ffffff;
  --fg-body:      #d6d3d1; /* stone-300 */
  --fg-muted:     #d6d3d1;
  --fg-soft:      #a8a29e; /* stone-400 */
  --fg-faint:     #78716c; /* stone-500 */
  --fg-fainter:   #57534e; /* stone-600 */
  --inline-bg:    #292524;
  --inline-fg:    #d6d3d1;
  --link:         #38bdf8; /* sky-400 */
  --link-hover:   #7dd3fc; /* sky-300 */
  --link-italic:  #7dd3fc;
  --selection:    rgba(56, 189, 248, 0.22);

  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--fg-body);
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "kern", "liga", "calt";
}

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

/* ----- topbar ----- */

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-h);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 var(--gutter);
  z-index: 50;
  font-family: var(--font-mono);
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--fg);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

/* Brand mark — ASCII art rendered in monospace.
   The logo is 15 cols × 9 rows. JetBrains Mono has a 0.6em char width,
   so 15 × 0.6em = 9.0em wide and 9 rows × 1em line-height = 9.0em tall
   → naturally square at line-height: 1. No vertical squish, no distortion. */
.topbar-brand .brand-mark {
  font-family: var(--font-mono);
  font-size: 3.5px;
  line-height: 1;
  letter-spacing: 0;
  white-space: pre;
  margin: 0;
  padding: 0;
  background: transparent;
  color: currentColor;
  flex-shrink: 0;
}

.topbar-brand .sep {
  color: var(--fg-fainter);
  font-weight: 400;
  letter-spacing: 0;
}

.topbar-brand .product {
  color: var(--fg);
}

.topbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: 0;
  color: var(--fg-soft);
  cursor: pointer;
  padding: 0;
  border-radius: 2px;
  transition: color 80ms ease;
}
.icon-btn:hover { color: var(--fg); }
.icon-btn:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
}
.icon-btn svg { width: 16px; height: 16px; display: block; }

/* sun icon visible in light, moon in dark */
html[data-theme="dark"] .icon-sun { display: none; }
html:not([data-theme="dark"]) .icon-moon { display: none; }

/* nav-toggle: only visible below the sidebar breakpoint */
.nav-toggle { display: none; margin-right: 0.5rem; margin-left: -0.5rem; }
@media (max-width: 767.98px) {
  .nav-toggle { display: inline-flex; }
}

/* backdrop for the mobile sidebar drawer */
.nav-backdrop {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  background: color-mix(in srgb, var(--fg-strong) 35%, transparent);
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease;
  z-index: 30;
}
html[data-nav-open="true"] .nav-backdrop {
  opacity: 1;
  pointer-events: auto;
}
@media (min-width: 768px) {
  .nav-backdrop { display: none; }
}

/* ----- layout ----- */

.sidebar {
  position: fixed;
  inset: var(--header-h) auto 0 0;
  width: var(--sidebar-w);
  background: var(--sidebar-bg);
  overflow-y: auto;
  padding: 1.5rem 0;
  z-index: 10;
}

.main {
  margin-left: var(--sidebar-w);
  padding-top: var(--header-h);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.article {
  padding: 3rem var(--gutter-lg) 4rem;
  max-width: calc(var(--content-max) + var(--gutter-lg) * 2);
  width: 100%;
  margin: 0 auto;     /* center column 2 within the remaining space */
  flex: 1;
}

.article-inner {
  max-width: var(--content-max);
}

/* Three-column layout at >=1280px: reserve right-side TOC slot. */
@media (min-width: 1280px) {
  .main { margin-right: calc(var(--toc-w) + var(--toc-gutter)); }
}

/* ----- sidebar nav ----- */

/* Horizontal padding lives on .nav so all children share the same indentation;
   the section-title border-bottom then aligns with the link column instead of
   spanning the full sidebar width. Active items use negative margins to extend
   their background back out to the sidebar edges. */
.nav {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 0 1.5rem;
}

.nav-section {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.33;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--fg-muted);
  padding: 0 0 0.75rem;
  margin: 0 0 0.75rem;
  border-bottom: 1px solid var(--border);
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: nav-counter;
}

.nav-item {
  counter-increment: nav-counter;
}

.nav-item a {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  padding: 0.5rem 0;
  color: var(--fg-soft);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  transition: color 80ms ease, background-color 80ms ease;
}

.nav-item a::before {
  content: counter(nav-counter, decimal-leading-zero);
  width: 1.5rem;
  font-size: 10px;
  color: var(--fg-soft);
  letter-spacing: 0.05em;
  flex-shrink: 0;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.nav-item a:hover {
  color: var(--fg-body);
}

.nav-item.active a {
  color: var(--fg-body);
  background: var(--bg);
  margin: 0 -1.5rem;
  padding: 0.5rem 1.5rem;
}

/* ----- right-side TOC ----- */

.toc {
  display: none;          /* hidden by default; shown at >=1280px */
  position: fixed;
  top: calc(var(--header-h) + 2.5rem);
  right: 2rem;
  width: var(--toc-w);
  max-height: calc(100vh - var(--header-h) - 4rem);
  overflow-y: auto;
  z-index: 5;
}
@media (min-width: 1280px) { .toc { display: block; } }

.toc-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--fg-faint);
  padding: 0 0 0.65rem;
  margin: 0 0 0.65rem;
  border-bottom: 1px solid var(--border);
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.toc-item a {
  display: block;
  padding: 0.3rem 0.85rem;
  margin-left: -2px;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.45;
  color: var(--fg-soft);
  text-decoration: none;
  transition: color 80ms ease, border-color 80ms ease;
}

.toc-item a:hover {
  color: var(--fg);
}

.toc-item a[aria-current="true"] {
  color: var(--fg-strong);
  border-left-color: var(--link);
  font-weight: 500;
}

/* ----- article ----- */

.eyebrow {
  display: inline-block;
  background: color-mix(in srgb, var(--link) 14%, transparent);
  color: var(--link);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 2px;
  margin-bottom: 1.5rem;
}

.page-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 48px;
  line-height: 1;
  letter-spacing: -0.025em;
  color: var(--fg-strong);
  margin: 0 0 1.25rem;
}

.page-lede {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 22px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--link-italic);
  margin: 0 0 2.25rem;
  font-weight: 400;
}

.prose {
  color: var(--fg-muted);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1.5;
}

/* Reset block margins on direct prose children — sibling rules below are the sole source of vertical rhythm. */
.prose > * { margin: 0; }
.prose > * + * { margin-top: 1.25rem; }              /* 20px default */
.prose > * + h2 { margin-top: 3rem; }                /* 48px before h2 */
.prose > h1 + h2,
.prose > .lede + h2,
.prose > .page-lede + h2,
.prose > :first-child:where(h2) { margin-top: 1.5rem; } /* 24px when h2 follows title/lede */
.prose > * + h3 { margin-top: 2rem; }                /* 32px before h3 */
.prose > h2 + * { margin-top: 1rem; }                /* 16px after h2 (matches ref ul mt=16) */
.prose > h3 + * { margin-top: 0.75rem; }             /* 12px after h3 */
.prose > * + ul, .prose > * + ol { margin-top: 1rem; }
.prose > * + pre, .prose > * + .highlight { margin-top: 1.5rem; }
.prose > h3 + pre, .prose > h3 + .highlight { margin-top: 0.75rem; }
.prose > pre + *, .prose > .highlight + * { margin-top: 1.25rem; }

/* h2 in body = small mono caps with hairline divider, like majorcontext.
   Spacing comes from sibling rules above; here we only style + add the divider. */
.prose h2 {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-muted);
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.prose h3 { scroll-margin-top: calc(var(--header-h) + 1rem); }

.prose h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  line-height: 1.55;
  letter-spacing: -0.025em;
  color: var(--fg-strong);
}

.prose h4 {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-muted);
}

.prose p { color: var(--fg-muted); }

.prose strong { color: var(--fg-strong); font-weight: 600; }
.prose em { font-style: italic; }

.prose a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--link) 35%, transparent);
  transition: color 80ms ease, border-color 80ms ease;
}
.prose a:hover {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}

/* lists */
.prose ul, .prose ol {
  padding-left: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.prose ul ul, .prose ol ol, .prose ul ol, .prose ol ul { margin-top: 0.5rem; }
.prose li { color: var(--fg-muted); }
.prose li > * + * { margin-top: 0.75rem; }
.prose li::marker { color: var(--fg-fainter); }

.prose blockquote {
  margin: 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 2px solid var(--border);
  color: var(--fg-soft);
}

.prose hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

.prose img, .prose video {
  max-width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border);
}

/* ----- code ----- */

.prose code, .prose pre, .prose kbd {
  font-family: var(--font-mono);
}

/* inline code: small stone pill */
.prose :not(pre) > code {
  background: var(--inline-bg);
  color: var(--inline-fg);
  padding: 2px 6px;
  border-radius: 2px;
  font-size: 0.875em;
  font-weight: 400;
}

/* code block: dark, regardless of theme */
.prose pre, .prose .highlight pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 1.25rem 1.5rem;
  border-radius: 4px;
  overflow-x: auto;
  line-height: 1.7;
  font-size: 14px;
  border: 0;
  margin: 0;
}

.prose pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
  font-weight: 400;
}

.prose .highlight { margin: 0; }

/* hugo chroma — github-dark-dimmed-ish */
.prose .chroma { background: transparent; color: var(--code-fg); }
.prose .chroma .c, .prose .chroma .c1, .prose .chroma .cm, .prose .chroma .cs { color: var(--code-comment); font-style: italic; }
.prose .chroma .k, .prose .chroma .kc, .prose .chroma .kd, .prose .chroma .kn, .prose .chroma .kp, .prose .chroma .kr, .prose .chroma .kt { color: var(--code-keyword); }
.prose .chroma .s, .prose .chroma .s1, .prose .chroma .s2, .prose .chroma .sb, .prose .chroma .sc, .prose .chroma .sh, .prose .chroma .sx { color: var(--code-string); }
.prose .chroma .m, .prose .chroma .mi, .prose .chroma .mf, .prose .chroma .mh, .prose .chroma .mo { color: var(--code-number); }
.prose .chroma .nf, .prose .chroma .fm { color: var(--code-fn); }
.prose .chroma .nb, .prose .chroma .bp { color: var(--code-fn); }
.prose .chroma .o, .prose .chroma .ow { color: var(--code-keyword); }
.prose .chroma .nv, .prose .chroma .vc, .prose .chroma .vg, .prose .chroma .vi { color: var(--code-fg); }

/* ----- tables ----- */

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.prose th, .prose td {
  text-align: left;
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid var(--border);
}
.prose th {
  font-weight: 600;
  color: var(--fg-strong);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom-color: var(--border);
}

/* ----- pager ----- */

.pager {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.pager a {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  text-decoration: none;
  color: var(--fg-soft);
  border: 0;
  padding: 0.5rem 0;
}
.pager a:hover .pager-title { color: var(--link); }
.pager-prev { text-align: left; align-items: flex-start; }
.pager-next { text-align: right; align-items: flex-end; grid-column: 2; }
.pager-label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--fg-fainter);
}
.pager-title {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--fg-strong);
  letter-spacing: -0.01em;
}

/* ----- list (category index) ----- */

.page-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}
.page-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.page-list a {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--fg-strong);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.page-list a:hover { color: var(--link); }
.page-list-desc { color: var(--fg-soft); font-size: 14px; }

/* ----- footer ----- */

.footer {
  margin-top: auto;
  padding: 2rem var(--gutter-lg);
  border-top: 1px solid var(--border-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-faint);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  display: flex;
  gap: 0.75rem;
  align-items: center;
}
.footer a {
  color: var(--fg-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
}
.footer a:hover { color: var(--fg); border-bottom-color: var(--fg-soft); }
.footer .sep { color: var(--fg-fainter); }

/* ----- responsive ----- */

@media (max-width: 1100px) {
  :root { --gutter-lg: 2rem; }
}

/* Below 768px: sidebar slides off-screen, opens via hamburger drawer. */
@media (max-width: 767.98px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 200ms ease;
    border-right: 1px solid var(--border);
    z-index: 40;
  }
  html[data-nav-open="true"] .sidebar {
    transform: translateX(0);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
  }
  .main { margin-left: 0; padding-top: var(--header-h); }
  .article { padding: 2.5rem var(--gutter) 3rem; }
  .page-title { font-size: 40px; }
  .page-lede { font-size: 20px; }
  html[data-nav-open="true"] body { overflow: hidden; }
}

@media (max-width: 480px) {
  body { font-size: 14px; }
  .article { padding: 2rem var(--gutter) 2.5rem; }
  .page-title { font-size: 32px; }
  .topbar { padding: 0 var(--gutter); }
}