/* Kontour design tokens — console accent: cobalt #5a90c8 */
:root {
  color-scheme: light;
  --bg: #f5f4ef;
  --bg-elevated: #ffffff;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-solid: #ffffff;
  --surface-muted: #ecebe4;
  --text: #202124;
  --text-strong: #101114;
  --muted: #5b626b;
  --line: rgba(36, 40, 46, 0.14);
  --line-strong: rgba(36, 40, 46, 0.26);
  --accent: #3a78b8;
  --accent-strong: #2a5d94;
  --accent-soft: #dde9f5;
  --warn: #8a5a00;
  --code-bg: #16202d;
  --code-text: #eef3f8;
  --shadow: 0 18px 50px -30px rgba(0, 0, 0, 0.25);
  --rail-width: 284px;
  --content-width: 1120px;
  --display-font: "Fraunces", Georgia, serif;
  --body-font: "Hanken Grotesk", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono-font: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0a0e13;
  --bg-elevated: #111824;
  --surface: rgba(17, 24, 36, 0.88);
  --surface-solid: #111824;
  --surface-muted: #16202d;
  --text: #eef3f8;
  --text-strong: #ffffff;
  --muted: #aebccb;
  --line: rgba(150, 180, 210, 0.14);
  --line-strong: rgba(150, 180, 210, 0.26);
  --accent: #5a90c8;
  --accent-strong: #7eb0de;
  --accent-soft: #142340;
  --warn: #f3b14b;
  --code-bg: #060a0f;
  --code-text: #eef3f8;
  --shadow: 0 26px 60px -42px rgba(0, 0, 0, 0.95);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--line) 22%, transparent) 1px, transparent 1px) 0 0 / 44px 44px,
    linear-gradient(color-mix(in srgb, var(--line) 18%, transparent) 1px, transparent 1px) 0 0 / 44px 44px,
    linear-gradient(135deg, color-mix(in srgb, var(--accent-soft) 32%, transparent) 0%, transparent 34%, transparent 100%),
    var(--bg);
  font-family: var(--body-font);
  font-size: 18px;
  line-height: 1.66;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent-strong);
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

.site-shell {
  display: grid;
  grid-template-columns: var(--rail-width) minmax(0, 1fr);
  min-height: 100vh;
}

.site-rail {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 30px 24px;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface-solid) 90%, transparent);
  backdrop-filter: blur(18px);
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.brand,
.mobile-brand {
  color: var(--text-strong);
  text-decoration: none;
}

.brand {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
}

.brand-mark {
  display: block;
  width: 18px;
  height: 18px;
  border-radius: 5px;
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  box-shadow: 0 0 16px color-mix(in srgb, var(--accent) 55%, transparent);
}

.brand-name strong,
.mobile-brand strong {
  color: var(--accent);
  font-weight: 600;
}

.brand-name,
.brand-kicker {
  display: block;
}

.brand-name {
  font-family: var(--body-font);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.2;
}

.brand-kicker {
  margin-top: 3px;
  color: var(--muted);
  font-family: var(--mono-font);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0;
  text-transform: uppercase;
}

.doc-nav {
  display: grid;
  gap: 3px;
  overflow-y: auto;
}

.doc-nav-section {
  display: block;
  margin: 12px 0 2px 10px;
  color: var(--muted);
  font-family: var(--mono-font);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.doc-nav a {
  display: block;
  min-height: 38px;
  padding: 7px 10px;
  border-left: 2px solid transparent;
  color: var(--muted);
  font-family: var(--mono-font);
  font-size: 13px;
  line-height: 1.45;
  text-decoration: none;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.doc-nav a:hover {
  border-left-color: var(--accent);
  background: var(--accent-soft);
  color: var(--text-strong);
  transform: translateX(2px);
}

.theme-toggle {
  margin-top: auto;
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  padding: 10px 12px;
  font-family: var(--mono-font);
  font-size: 12px;
  cursor: pointer;
  transition: border-color 160ms ease, transform 160ms ease, background 160ms ease;
}

.theme-toggle:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.theme-toggle__track {
  position: relative;
  flex: 0 0 auto;
  width: 42px;
  height: 22px;
  border: 1px solid var(--line-strong);
  background: var(--surface-muted);
}

.theme-toggle__thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 14px;
  height: 14px;
  background: var(--accent);
  transition: transform 180ms ease;
}

:root[data-theme="dark"] .theme-toggle__thumb {
  transform: translateX(20px);
}

.doc-main {
  min-width: 0;
  padding: 32px clamp(18px, 5vw, 64px) 80px;
}

.doc-topbar {
  display: none;
}

.doc-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: clamp(28px, 5vw, 58px);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.doc-content > :first-child {
  margin-top: 0;
}

.doc-content h1,
.doc-content h2,
.doc-content h3 {
  color: var(--text-strong);
  font-family: var(--display-font);
  font-weight: 650;
  line-height: 1.06;
}

.doc-content h1 {
  max-width: 760px;
  margin: 0 0 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
  font-size: clamp(42px, 7vw, 76px);
}

.doc-content h2 {
  margin: 48px 0 14px;
  font-size: clamp(28px, 4vw, 42px);
}

.doc-content h3 {
  margin: 34px 0 10px;
  font-size: 25px;
}

.doc-content p,
.doc-content li {
  max-width: 76ch;
}

.doc-content p {
  margin: 0 0 18px;
}

.doc-content ul,
.doc-content ol {
  margin: 0 0 24px;
  padding-left: 1.15em;
}

.doc-content li + li {
  margin-top: 6px;
}

.doc-content hr {
  margin: 42px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.doc-content blockquote {
  margin: 28px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
}

.doc-content code {
  padding: 0.11em 0.32em;
  border: 1px solid color-mix(in srgb, var(--line) 70%, transparent);
  background: var(--surface-muted);
  color: var(--text-strong);
  font-family: var(--mono-font);
  font-size: 0.82em;
}

.doc-content pre {
  margin: 24px 0;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid color-mix(in srgb, var(--line-strong) 55%, transparent);
  background: var(--code-bg);
  color: var(--code-text);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.doc-content pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  font-size: 13px;
  line-height: 1.6;
}

.doc-content table {
  display: block;
  width: 100%;
  margin: 28px 0;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 15px;
}

.doc-content th,
.doc-content td {
  min-width: 160px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  vertical-align: top;
}

.doc-content th {
  background: var(--surface-muted);
  color: var(--text-strong);
  font-family: var(--mono-font);
  font-size: 12px;
  font-weight: 600;
  text-align: left;
  text-transform: uppercase;
}

.doc-content tr:nth-child(even) td {
  background: color-mix(in srgb, var(--surface-muted) 38%, transparent);
}

.mermaid {
  position: relative;
  width: 100%;
  margin: 28px 0;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface-solid) 82%, var(--accent-soft));
}

.mermaid::before {
  content: "Diagram";
  display: inline-block;
  margin: 0 0 10px;
  color: var(--muted);
  font-family: var(--mono-font);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
}

.mermaid svg {
  display: block;
  max-width: none;
  min-width: min(760px, 92vw);
  height: auto;
}

.mermaid--error {
  color: var(--code-text);
  background: var(--code-bg);
  font-family: var(--mono-font);
  font-size: 13px;
  line-height: 1.6;
  white-space: pre;
}

.home-lede {
  max-width: 780px;
  margin: -4px 0 30px;
  color: var(--muted);
  font-size: 22px;
  line-height: 1.45;
}

.doc-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0 36px;
}

.doc-card {
  min-height: 156px;
  padding: 18px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface-solid) 78%, transparent);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.doc-card:hover {
  border-color: var(--accent);
  box-shadow: 8px 8px 0 var(--accent-soft);
  transform: translate(-2px, -2px);
}

.doc-card strong {
  display: block;
  margin-bottom: 8px;
  color: var(--text-strong);
  font-family: var(--mono-font);
  font-size: 13px;
  text-transform: uppercase;
}

.doc-card span {
  display: block;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.45;
}

.doc-nav-external {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: 0;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.16s ease, opacity 0.16s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-backdrop {
  display: none;
}

.site-footer {
  max-width: var(--content-width);
  margin: 48px auto 0;
  padding: 20px 18px 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 860px) {
  body {
    font-size: 17px;
  }

  body.nav-open {
    overflow: hidden;
  }

  .site-shell {
    display: block;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-rail {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 30;
    width: min(82vw, 320px);
    padding: 18px 16px max(24px, env(safe-area-inset-bottom));
    background: var(--surface-solid);
    border-right: 1px solid var(--line);
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    transform: translateX(-105%);
    transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1);
  }

  .site-rail.open {
    transform: translateX(0);
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 25;
    background: rgba(0, 0, 0, 0.5);
  }

  .nav-backdrop[hidden] {
    display: none;
  }

  .doc-main {
    padding: 0 14px 44px;
  }

  .doc-topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: 62px;
    margin: 0 -14px 14px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--line);
    background: color-mix(in srgb, var(--surface-solid) 90%, transparent);
    backdrop-filter: blur(16px);
  }

  .mobile-brand {
    font-family: var(--body-font);
    font-size: 18px;
    font-weight: 600;
  }

  .theme-toggle--compact {
    width: auto;
    margin: 0;
  }

  .doc-content {
    padding: 24px 18px 36px;
  }

  .doc-content h1 {
    font-size: clamp(38px, 14vw, 54px);
  }

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

  .mermaid {
    padding: 12px;
  }

  .mermaid::before {
    content: "Diagram - scroll sideways";
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}