/* ------------------------------------------------------------------------- *
 * PSON5 docs-site — design system matching the landing.
 * Dark editorial: Fraunces display serif, Inter for UI, JetBrains Mono for
 * code; a single phosphor-green accent and the observed/inferred/simulated
 * colour grammar from landing.css.
 * ------------------------------------------------------------------------- */

:root {
  /* Surfaces */
  --bg-0: #09090b;
  --bg-1: #0e0f12;
  --bg-2: #141518;
  --bg-3: #1b1c21;

  /* Ink */
  --ink-0: #f5f4ef;
  --ink-1: #b8b6ae;
  --ink-2: #7d7b73;
  --ink-3: #52514c;

  /* Hairlines */
  --line-soft: rgba(245, 244, 239, 0.06);
  --line: rgba(245, 244, 239, 0.09);
  --line-strong: rgba(245, 244, 239, 0.16);

  /* Accent + layer palette */
  --accent: #b6ff5c;
  --accent-dim: #7cc038;
  --accent-glow: rgba(182, 255, 92, 0.22);
  --accent-wash: rgba(182, 255, 92, 0.08);
  --observed: #f5c76a;
  --inferred: #b6ff5c;
  --simulated: #8ec7ff;

  /* Type */
  --font-display: "Fraunces", "New York", "Iowan Old Style", ui-serif, Georgia, serif;
  --font-ui: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  /* Radii */
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 20px;

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);

  color-scheme: dark;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--bg-0);
  color: var(--ink-0);
  font-family: var(--font-ui);
  font-size: 15.5px;
  line-height: 1.6;
  font-feature-settings: "ss01", "cv11";
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(circle at 1px 1px, rgba(245, 244, 239, 0.045) 1px, transparent 0);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, black 0%, black 80%, transparent 100%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 40% 30% at 0% 0%, rgba(182, 255, 92, 0.06), transparent 60%),
    radial-gradient(ellipse 50% 30% at 100% 100%, rgba(142, 199, 255, 0.04), transparent 60%);
}

a {
  color: inherit;
  text-decoration: none;
}

::selection {
  background: var(--accent);
  color: var(--bg-0);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 12px;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--bg-0);
  border-radius: var(--r-sm);
  font-weight: 600;
  z-index: 1000;
}

.skip-link:focus-visible {
  left: 16px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0 0 8px;
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--ink-3);
}

.eyebrow--accent {
  color: var(--accent);
}

.eyebrow--accent::before {
  background: var(--accent);
}

.italic-mark {
  font-style: italic;
  font-variation-settings: "opsz" 144, "SOFT" 100;
}

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

.docs-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  border-right: 1px solid var(--line-soft);
  padding: 24px 20px;
  overflow-y: auto;
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  gap: 20px;
  background: var(--bg-1);
}

.sidebar::-webkit-scrollbar {
  width: 6px;
}

.sidebar::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 999px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 4px 0;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  position: relative;
  display: inline-block;
  box-shadow: 0 0 22px var(--accent-glow);
}

.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  height: 2px;
  background: var(--bg-0);
}

.brand-mark::before {
  top: 12px;
}

.brand-mark::after {
  top: 20px;
  background: var(--bg-0);
  opacity: 0.55;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand-copy strong {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--ink-0);
}

.brand-copy small {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-2);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: 4px;
}

.search {
  display: grid;
  gap: 6px;
}

.search span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-2);
}

.search input {
  font: inherit;
  font-size: 0.88rem;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--bg-0);
  color: var(--ink-0);
  outline: none;
  transition: border-color 160ms var(--ease-out), box-shadow 160ms var(--ease-out);
}

.search input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-wash);
}

.search input::placeholder {
  color: var(--ink-3);
}

.sidebar-nav {
  display: grid;
  gap: 18px;
  align-content: start;
  overflow-y: auto;
}

.nav-group {
  display: grid;
  gap: 2px;
}

.nav-group-title {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-2);
  padding: 4px 8px;
  margin-bottom: 4px;
}

.nav-link {
  display: block;
  padding: 7px 10px;
  border-radius: var(--r-sm);
  color: var(--ink-1);
  font-size: 0.88rem;
  transition: background 140ms var(--ease-out), color 140ms var(--ease-out);
  position: relative;
}

.nav-link:hover {
  background: var(--bg-2);
  color: var(--ink-0);
}

.nav-link.active {
  background: var(--bg-2);
  color: var(--accent);
}

.nav-link.active::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.sidebar-footer {
  display: flex;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-2);
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.sidebar-footer a {
  color: var(--ink-2);
  transition: color 140ms var(--ease-out);
}

.sidebar-footer a:hover {
  color: var(--ink-0);
}

/* ------------------------------------------------------------------------- *
 * Main / topbar / pager
 * ------------------------------------------------------------------------- */

.main {
  padding: 0 48px 64px;
  min-width: 0;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 20px 0;
  margin-bottom: 24px;
  position: sticky;
  top: 0;
  z-index: 10;
  background: linear-gradient(180deg, rgba(9, 9, 11, 0.95), rgba(9, 9, 11, 0.8));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}

.topbar__breadcrumb {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.topbar__breadcrumb .eyebrow {
  margin: 0;
}

.topbar h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--ink-0);
}

.topbar__actions {
  display: flex;
  gap: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 200ms var(--ease-out), background 200ms var(--ease-out),
    border-color 200ms var(--ease-out);
  font-family: inherit;
}

.btn--sm {
  padding: 7px 14px;
  font-size: 0.82rem;
}

.btn--primary {
  background: var(--accent);
  color: var(--bg-0);
  font-weight: 600;
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 30px var(--accent-glow);
}

.btn--ghost {
  background: transparent;
  color: var(--ink-0);
  border-color: var(--line-strong);
}

.btn--ghost:hover {
  border-color: var(--ink-0);
  background: var(--bg-1);
}

.content-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 56px;
  align-items: start;
  padding-top: 8px;
}

.content {
  max-width: 72ch;
  min-width: 0;
}

.content > .eyebrow {
  margin: 0 0 18px;
}

.content > p:first-of-type {
  font-size: 1.08rem;
  color: var(--ink-1);
  line-height: 1.6;
  margin: 0 0 32px;
  max-width: 58ch;
}

.content h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.7rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 48px 0 16px;
  scroll-margin-top: 96px;
}

.content h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  margin: 32px 0 12px;
  scroll-margin-top: 96px;
}

.content h4 {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 28px 0 12px;
}

.content p {
  margin: 0 0 16px;
  color: var(--ink-1);
  line-height: 1.65;
}

.content p strong {
  color: var(--ink-0);
  font-weight: 600;
}

.content a:not(.btn) {
  color: var(--accent);
  transition: color 140ms var(--ease-out);
  border-bottom: 1px solid rgba(182, 255, 92, 0.2);
}

.content a:not(.btn):hover {
  color: var(--ink-0);
  border-bottom-color: var(--ink-0);
}

.content ul,
.content ol {
  padding-left: 22px;
  margin: 0 0 20px;
  color: var(--ink-1);
}

.content li {
  margin: 4px 0;
  line-height: 1.65;
}

.content li strong {
  color: var(--ink-0);
  font-weight: 600;
}

.content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-2);
  color: var(--accent);
  border: 1px solid var(--line-soft);
}

.content pre {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.65;
  background: var(--bg-1);
  color: var(--ink-0);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 20px 0 24px;
}

.content pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.content blockquote {
  margin: 20px 0;
  padding: 14px 18px;
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: var(--bg-1);
  color: var(--ink-1);
  font-style: italic;
}

.content hr {
  border: none;
  border-top: 1px solid var(--line-soft);
  margin: 40px 0;
}

.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.88rem;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.content th,
.content td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
}

.content th {
  background: var(--bg-1);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.content tr:last-child td {
  border-bottom: none;
}

/* Custom docs primitives (used by site-data content strings) */

.callout {
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--accent);
  border-radius: var(--r-md);
  background: var(--bg-1);
  color: var(--ink-1);
  margin: 0 0 28px;
  font-size: 0.96rem;
  line-height: 1.6;
}

.callout strong {
  color: var(--ink-0);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin: 16px 0 28px;
}

.card {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-1);
  transition: border-color 140ms var(--ease-out);
}

.card:hover {
  border-color: var(--line-strong);
}

.card strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--ink-0);
  margin-bottom: 6px;
}

.card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--ink-1);
  line-height: 1.5;
}

.pill-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 8px 0 16px;
}

.pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-1);
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-1);
}

.pill--observed { color: var(--observed); border-color: rgba(245, 199, 106, 0.35); }
.pill--inferred { color: var(--inferred); border-color: rgba(182, 255, 92, 0.35); }
.pill--simulated { color: var(--simulated); border-color: rgba(142, 199, 255, 0.35); }

/* ------------------------------------------------------------------------- *
 * TOC
 * ------------------------------------------------------------------------- */

.toc {
  position: sticky;
  top: 88px;
  padding-left: 24px;
  border-left: 1px solid var(--line-soft);
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.toc__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0 0 12px;
}

.toc nav {
  display: grid;
  gap: 4px;
}

.toc a {
  display: block;
  font-size: 0.82rem;
  color: var(--ink-2);
  padding: 4px 0;
  border-left: 2px solid transparent;
  padding-left: 10px;
  margin-left: -12px;
  transition: color 140ms var(--ease-out), border-color 140ms var(--ease-out);
}

.toc a:hover {
  color: var(--ink-0);
  border-left-color: var(--accent);
}

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

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 72px;
  padding-top: 28px;
  border-top: 1px solid var(--line-soft);
}

.pager a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--bg-1);
  transition: border-color 140ms var(--ease-out), transform 140ms var(--ease-out);
}

.pager a:hover {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.pager a small {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--ink-2);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.pager a strong {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--ink-0);
}

.pager a:nth-child(2) {
  text-align: right;
}

.pager span {
  display: block;
}

/* ------------------------------------------------------------------------- *
 * Responsive
 * ------------------------------------------------------------------------- */

@media (max-width: 1200px) {
  .content-wrap {
    grid-template-columns: 1fr;
  }

  .toc {
    display: none;
  }
}

@media (max-width: 900px) {
  .docs-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--line-soft);
  }

  .main {
    padding: 0 24px 48px;
  }
}

@media (max-width: 560px) {
  .main {
    padding: 0 16px 32px;
  }

  .pager {
    grid-template-columns: 1fr;
  }

  .pager a:nth-child(2) {
    text-align: left;
  }
}