/* Ouroboros landing site.
 *
 * Two themes. The whole light palette is defined on bare :root; the dark one
 * only redefines the same names, twice — once for the reader whose system is
 * dark and has not chosen, once for the reader who pressed the button. A colour
 * that exists only inside a media query disappears for one of those two, which
 * is the usual way a page ends up unreadable for half its readers.
 */

:root {
  --paper: #fbfaf8;
  --card: #ffffff;
  --ink: #14181f;
  --ink-soft: #4a5261;
  --ink-faint: #767f8f;
  --rule: #e2e0dc;
  --rule-soft: #eeecE8;
  --accent: #b3400a;
  --accent-soft: #fdf1ea;
  --code-bg: #f5f3ef;
  --code-ink: #24303f;
  --shadow: 0 1px 2px rgba(20, 24, 31, .06), 0 8px 24px rgba(20, 24, 31, .05);
  --measure: 40rem;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #14171c;
    --card: #1b1f26;
    --ink: #e7eaf0;
    --ink-soft: #a8b1c0;
    --ink-faint: #7d8798;
    --rule: #2b313b;
    --rule-soft: #232932;
    --accent: #ff8b52;
    --accent-soft: #2a1d16;
    --code-bg: #191d24;
    --code-ink: #d6dde8;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --paper: #14171c;
  --card: #1b1f26;
  --ink: #e7eaf0;
  --ink-soft: #a8b1c0;
  --ink-faint: #7d8798;
  --rule: #2b313b;
  --rule-soft: #232932;
  --accent: #ff8b52;
  --accent-soft: #2a1d16;
  --code-bg: #191d24;
  --code-ink: #d6dde8;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3);
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.65 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }

.skip {
  position: absolute; left: -9999px; top: 0; background: var(--card);
  padding: .6rem 1rem; z-index: 10;
}
.skip:focus { left: 0; }

/* ---------------------------------------------------------------- header -- */

.top {
  display: flex; align-items: center; gap: .85rem; flex-wrap: wrap;
  padding: .7rem clamp(1rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--rule);
  background: var(--card);
  position: sticky; top: 0; z-index: 5;
}
.brand {
  display: inline-flex; align-items: center; gap: .5rem;
  font-weight: 700; letter-spacing: -.01em; color: var(--ink); text-decoration: none;
}
.brand .mark { color: var(--accent); }
.tagline {
  color: var(--ink-faint); font-size: .84rem; border-left: 1px solid var(--rule);
  padding-left: .85rem;
}
.tabs { display: flex; gap: .25rem; margin-left: auto; flex-wrap: wrap; }
.tabs a {
  color: var(--ink-soft); text-decoration: none; font-size: .9rem;
  padding: .3rem .7rem; border-radius: 999px;
}
.tabs a:hover { background: var(--rule-soft); color: var(--ink); }
.tabs a.here { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.version, .gh {
  font-size: .8rem; color: var(--ink-soft); text-decoration: none;
  border: 1px solid var(--rule); border-radius: 999px; padding: .18rem .6rem;
}
.version:hover, .gh:hover { border-color: var(--accent); color: var(--accent); }
.theme {
  border: 1px solid var(--rule); background: transparent; color: var(--ink-soft);
  border-radius: 999px; width: 2rem; height: 2rem; cursor: pointer; font-size: .95rem;
}
.theme:hover { border-color: var(--accent); color: var(--accent); }

@media (max-width: 780px) {
  .tagline { display: none; }
  .tabs { margin-left: 0; order: 3; width: 100%; }
}

/* ----------------------------------------------------------------- shell -- */

.shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 15rem;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  max-width: 68rem;
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 3rem) clamp(1rem, 4vw, 2.5rem) 4rem;
}
.content { min-width: 0; max-width: var(--measure); }
@media (max-width: 1000px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .toc { display: none; }
}

.toc { position: sticky; top: 4.5rem; align-self: start; font-size: .86rem; }
.toc-title {
  text-transform: uppercase; letter-spacing: .08em; font-size: .7rem;
  color: var(--ink-faint); margin-bottom: .5rem;
}
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--rule); }
.toc li a {
  display: block; padding: .22rem 0 .22rem .8rem; color: var(--ink-soft);
  text-decoration: none; border-left: 2px solid transparent; margin-left: -1px;
}
.toc li a:hover { color: var(--accent); border-left-color: var(--accent); }

/* ------------------------------------------------------------ typography -- */

h1, h2, h3, h4 { line-height: 1.22; letter-spacing: -.015em; }
h1 { font-size: clamp(1.9rem, 4.5vw, 2.6rem); margin: 0 0 1rem; }
h2 {
  font-size: 1.5rem; margin: 3rem 0 .9rem; padding-top: 1.4rem;
  border-top: 1px solid var(--rule);
}
h3 { font-size: 1.13rem; margin: 2rem 0 .6rem; }
h4 { font-size: 1rem; margin: 1.5rem 0 .5rem; color: var(--ink-soft); }
p { margin: 0 0 1rem; }
ul, ol { margin: 0 0 1.1rem; padding-left: 1.3rem; }
li { margin: .3rem 0; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }
strong { font-weight: 660; }

blockquote {
  margin: 1.4rem 0; padding: .9rem 1.1rem;
  background: var(--accent-soft); border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
}
blockquote p:last-child { margin: 0; }

/* ------------------------------------------------------------------ hero -- */

.hero { margin: 0 0 2.5rem; }
.hero h1 { max-width: 22ch; }
.hero .lede { font-size: 1.16rem; color: var(--ink-soft); max-width: 46ch; }
.hero .lede strong { color: var(--ink); }

.cards { display: grid; gap: .9rem; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); margin: 1.6rem 0 2rem; }
.cards > p {
  margin: 0; background: var(--card); border: 1px solid var(--rule);
  border-radius: 10px; padding: .9rem 1rem; font-size: .92rem; color: var(--ink-soft);
  box-shadow: var(--shadow);
}
.cards > p strong { display: block; color: var(--ink); margin-bottom: .15rem; }

.note {
  margin: 1.6rem 0; padding: 1rem 1.15rem; border: 1px solid var(--rule);
  border-radius: 10px; background: var(--card); box-shadow: var(--shadow);
}
.note > :last-child { margin-bottom: 0; }
.note h3 { margin-top: 0; }

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

.code { margin: 1.2rem 0; }
.code-title {
  font: 600 .74rem/1 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: .04em; text-transform: uppercase; color: var(--ink-faint);
  padding: 0 0 .4rem;
}
pre {
  margin: 0; padding: .9rem 1rem; overflow-x: auto;
  background: var(--code-bg); color: var(--code-ink);
  border: 1px solid var(--rule); border-radius: 10px;
}
pre code {
  font: .82rem/1.55 ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  white-space: pre;
}
code {
  font: .88em/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  background: var(--code-bg); border: 1px solid var(--rule-soft);
  border-radius: 4px; padding: .05em .32em;
}
pre code { background: none; border: 0; padding: 0; }

/* Trace records are one long line each, and the interesting half of the
 * comparison between languages — the `a` field — sits past the right edge of
 * the column. Sideways scrolling hides it: the reader has to know it is there
 * to go looking. So JSON wraps, and only JSON; indented code would lose its
 * shape and gains nothing, because its lines are short already. */
pre.lang-json code { white-space: pre-wrap; overflow-wrap: anywhere; }
a code { color: inherit; }

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

.tw { overflow-x: auto; margin: 1.3rem 0; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td {
  text-align: left; vertical-align: top; padding: .55rem .7rem;
  border-bottom: 1px solid var(--rule);
}
thead th {
  font-size: .74rem; text-transform: uppercase; letter-spacing: .05em;
  color: var(--ink-faint); border-bottom: 1px solid var(--rule);
}
tbody tr:hover { background: var(--rule-soft); }

/* -------------------------------------------------------------- diagrams -- */

.diagram {
  margin: 1.6rem 0; padding: 1.1rem; border: 1px solid var(--rule);
  border-radius: 12px; background: var(--card); box-shadow: var(--shadow);
}
.diagram img { display: block; width: 100%; height: auto; max-width: 100%; }
.diagram img.dark { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .diagram img.light { display: none; }
  :root:not([data-theme="light"]) .diagram img.dark { display: block; }
}
:root[data-theme="dark"] .diagram img.light { display: none; }
:root[data-theme="dark"] .diagram img.dark { display: block; }

.diagram figcaption {
  margin-top: .8rem; font-size: .88rem; color: var(--ink-soft);
}
.diagram details { margin-top: .7rem; }
.diagram summary {
  cursor: pointer; font-size: .8rem; color: var(--ink-faint);
}
.diagram summary:hover { color: var(--accent); }
.diagram details .code { margin-bottom: 0; }

/* --------------------------------------------------- documentation pages -- */
/* The documentation folds the real call and the real answer of each MCP tool
 * away behind a `<details>` of its own — seventeen of them on one page, which
 * is unreadable unfolded and unfindable if it does not look foldable. */

.content > details {
  margin: 1.2rem 0; padding: .7rem .95rem;
  border: 1px solid var(--rule); border-radius: 10px; background: var(--card);
}
.content > details[open] { padding-bottom: .3rem; }
.content > details > summary {
  cursor: pointer; font-size: .88rem; color: var(--ink-soft); font-weight: 600;
}
.content > details > summary:hover { color: var(--accent); }
.content > details > :last-child { margin-bottom: 0; }

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

.bottom {
  border-top: 1px solid var(--rule); background: var(--card);
  padding: 1.5rem clamp(1rem, 4vw, 2.5rem);
  font-size: .82rem; color: var(--ink-soft);
}
.bottom p { max-width: 62rem; margin: 0 auto .5rem; }
.bottom .origin { color: var(--ink-faint); }

/* ------------------------------------------------------------- breakout -- */
/* Diagrams, wide tables and code want more room than a comfortable line of
 * prose does, so on a wide screen they step out of the text column by a fixed
 * amount. The step is small enough that the column below still fits the grid
 * track — a breakout that overflows its track lands on top of the contents
 * list, which is worse than a narrow diagram. */
@media (min-width: 1100px) {
  .diagram, .content > .tw, .content > .code { margin-inline: -2.5rem; }
}