/* -----------------------------------------------------------------
   Support Copilot — an unofficial Mastra demo.
   Palette + type deliberately not the cream/terracotta or dark/neon
   defaults: warm charcoal (not black), two semantic diff colors
   (ochre/amber for regression, green for grounded), a separate dusty
   blue for interactive elements. Editorial serif for headlines,
   humanist sans for UI text, monospace only where content is
   genuinely code/data (prompts, tool calls, scores).
------------------------------------------------------------------*/

:root {
  --bg: #1b1815;
  --surface: #232019;
  --surface-2: #2a251d;
  --ink: #ede7da;
  --ink-muted: #a79e8c;
  --ink-faint: #7c7362;
  --line: #3a342a;
  --line-strong: #4c4535;

  --bad: #c9793a;
  --bad-soft: rgba(201, 121, 58, 0.14);
  --bad-ink: #f1c398;

  --good: #4f9d6e;
  --good-soft: rgba(79, 157, 110, 0.14);
  --good-ink: #a9d9bb;

  --link: #7fb0d6;
  --link-soft: rgba(127, 176, 214, 0.14);

  --radius: 4px;

  --font-display: "Instrument Serif", Georgia, serif;
  --font-body: "Work Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
}

:root[data-theme="light"] {
  --bg: #f1ece2;
  --surface: #ffffff;
  --surface-2: #fbf6ec;
  --ink: #241f17;
  --ink-muted: #6b6255;
  --ink-faint: #8b8272;
  --line: #ddd5c4;
  --line-strong: #c9bfa9;

  --bad: #a5542a;
  --bad-soft: rgba(165, 84, 42, 0.1);
  --bad-ink: #7a3c1c;

  --good: #2f7a50;
  --good-soft: rgba(47, 122, 80, 0.1);
  --good-ink: #245c3d;

  --link: #2e6789;
  --link-soft: rgba(46, 103, 137, 0.1);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f1ece2;
    --surface: #ffffff;
    --surface-2: #fbf6ec;
    --ink: #241f17;
    --ink-muted: #6b6255;
    --ink-faint: #8b8272;
    --line: #ddd5c4;
    --line-strong: #c9bfa9;

    --bad: #a5542a;
    --bad-soft: rgba(165, 84, 42, 0.1);
    --bad-ink: #7a3c1c;

    --good: #2f7a50;
    --good-soft: rgba(47, 122, 80, 0.1);
    --good-ink: #245c3d;

    --link: #2e6789;
    --link-soft: rgba(46, 103, 137, 0.1);
  }
}

* { box-sizing: border-box; }

html { color-scheme: dark light; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

.skip-link a {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--surface);
  color: var(--ink);
  padding: 10px 16px;
  z-index: 100;
}
.skip-link a:focus {
  left: 12px;
  top: 12px;
}

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

:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
}

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

code {
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0.05em 0.35em;
  font-size: 0.88em;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(1.9rem, 4.4vw, 2.85rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.15rem; font-weight: 600; font-family: var(--font-body); }

p { margin: 0 0 1em; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

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

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 20px;
  padding-top: 16px;
  padding-bottom: 16px;
}

.brand { display: flex; flex-direction: column; }
.brand-name { font-weight: 600; font-size: 1rem; }
.brand-sub { font-size: 0.78rem; color: var(--ink-faint); }

.site-nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-nav a {
  font-size: 0.88rem;
  color: var(--ink-muted);
  text-decoration: none;
}
.site-nav a:hover { color: var(--ink); }

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

.hero {
  padding: 48px 0 40px;
}

.disclaimer {
  font-size: 0.82rem;
  color: var(--ink-faint);
  margin-bottom: 18px;
}

.hero h1 {
  max-width: 15ch;
  margin-bottom: 18px;
}

.dek {
  max-width: 62ch;
  color: var(--ink-muted);
  font-size: 1.05rem;
}

.diff-panel {
  margin-top: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}

.diff-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
}

.diff-file {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-muted);
}

.diff-legend { display: flex; gap: 8px; }
.tag {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 3px;
  border: 1px solid var(--line);
}
.tag-removed { color: var(--bad-ink); border-color: var(--bad); background: var(--bad-soft); }
.tag-added { color: var(--good-ink); border-color: var(--good); background: var(--good-soft); }

.diff-body {
  margin: 0;
  padding: 14px 16px;
  font-size: 0.86rem;
  line-height: 1.65;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.diff-line { display: block; padding: 1px 6px; border-radius: 2px; }
.diff-line.removed { background: var(--bad-soft); color: var(--bad-ink); }
.diff-line.added { background: var(--good-soft); color: var(--good-ink); }
.diff-line.context { color: var(--ink-muted); }
.diff-marker { display: inline-block; width: 1.4em; color: var(--ink-faint); user-select: none; }

/* ---------- sections ---------- */

.section { padding: 52px 0; border-top: 1px solid var(--line); }
.section-alt { background: var(--surface); }

.section-lede {
  max-width: 68ch;
  color: var(--ink-muted);
}

/* ---------- eval status + summary ---------- */

.status-banner {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  background: var(--surface);
  font-size: 0.92rem;
  margin: 18px 0;
}
.status-banner.pending { border-color: var(--bad); background: var(--bad-soft); }
.status-banner.complete { border-color: var(--good); background: var(--good-soft); }
.status-banner code { background: none; border: none; padding: 0; }

.scorer-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin: 20px 0 28px;
}

.scorer-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  background: var(--surface);
}
.scorer-card h4 {
  margin: 0 0 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-muted);
  text-transform: none;
}
.scorer-row { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 0.86rem; padding: 2px 0; }
.scorer-delta { font-size: 0.78rem; margin-top: 6px; }
.scorer-delta.is-bad { color: var(--bad); }
.scorer-delta.is-good { color: var(--good); }

/* ---------- eval items ---------- */

.eval-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 14px;
  background: var(--surface);
}
.eval-item.is-regressed { border-color: var(--bad); }

.eval-item-head {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: inherit;
  font: inherit;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  cursor: pointer;
}

.eval-item-question { font-weight: 500; }
.eval-item-flags { display: flex; gap: 8px; align-items: center; flex-shrink: 0; }

.flag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 3px;
  border: 1px solid var(--line);
  color: var(--ink-muted);
  white-space: nowrap;
}
.flag.is-regressed { border-color: var(--bad); color: var(--bad-ink); background: var(--bad-soft); }
.flag.is-trick { border-color: var(--link); color: var(--link); background: var(--link-soft); }
.flag.is-pending { color: var(--ink-faint); }

.eval-item-body {
  padding: 0 16px 16px;
  display: none;
}
.eval-item.is-open .eval-item-body { display: block; }

.version-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 8px;
}
@media (max-width: 640px) {
  .version-compare { grid-template-columns: 1fr; }
}

.version-col {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: var(--surface-2);
}
.version-col h5 { margin: 0 0 8px; font-size: 0.8rem; color: var(--ink-muted); font-weight: 600; }
.version-answer { font-size: 0.92rem; margin-bottom: 10px; }
.version-scores { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.score-chip { font-family: var(--font-mono); font-size: 0.74rem; padding: 2px 7px; border-radius: 3px; border: 1px solid var(--line); }
.score-chip.ok { border-color: var(--good); color: var(--good-ink); background: var(--good-soft); }
.score-chip.low { border-color: var(--bad); color: var(--bad-ink); background: var(--bad-soft); }
.version-docs { font-size: 0.78rem; color: var(--ink-muted); }
.version-docs a { color: var(--link); }
.version-reason { font-size: 0.8rem; color: var(--ink-faint); margin-top: 6px; }

/* ---------- chat ---------- */

.chat-widget {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  margin-top: 20px;
}

.chat-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
}

.version-toggle { display: flex; border: 1px solid var(--line); border-radius: 3px; overflow: hidden; }
.version-btn {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 6px 10px;
  background: transparent;
  color: var(--ink-muted);
  border: none;
  cursor: pointer;
}
.version-btn + .version-btn { border-left: 1px solid var(--line); }
.version-btn.is-active { background: var(--link-soft); color: var(--link); }

.suggested-prompts { display: flex; gap: 6px; flex-wrap: wrap; }
.suggested-prompt {
  font-size: 0.76rem;
  padding: 5px 9px;
  border-radius: 3px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-muted);
  cursor: pointer;
}
.suggested-prompt:hover { color: var(--ink); border-color: var(--line-strong); }

.chat-transcript {
  padding: 16px;
  min-height: 90px;
  max-height: 420px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.chat-placeholder { color: var(--ink-faint); font-size: 0.9rem; margin: 0; }

.chat-msg { max-width: 90%; }
.chat-msg.user { align-self: flex-end; text-align: right; }
.chat-msg-bubble {
  display: inline-block;
  padding: 9px 13px;
  border-radius: 8px;
  font-size: 0.92rem;
  text-align: left;
}
.chat-msg.user .chat-msg-bubble { background: var(--link-soft); border: 1px solid var(--line); }
.chat-msg.agent .chat-msg-bubble { background: var(--surface-2); border: 1px solid var(--line); }
.chat-msg.error .chat-msg-bubble { background: var(--bad-soft); border: 1px solid var(--bad); color: var(--bad-ink); }
.chat-msg-meta { font-size: 0.72rem; color: var(--ink-faint); margin-top: 4px; font-family: var(--font-mono); }

.chat-form {
  display: flex;
  gap: 10px;
  padding: 14px 16px;
  border-top: 1px solid var(--line);
}
.chat-form textarea {
  flex: 1;
  resize: vertical;
  font-family: var(--font-body);
  font-size: 0.92rem;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--bg);
  color: var(--ink);
}
.chat-form button {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 8px 16px;
  border-radius: 3px;
  border: 1px solid var(--link);
  background: var(--link-soft);
  color: var(--link);
  cursor: pointer;
  align-self: flex-end;
}
.chat-form button:disabled { opacity: 0.5; cursor: default; }
.chat-form button:hover:not(:disabled) { background: var(--link); color: var(--bg); }

.chat-meta { padding: 0 16px 14px; margin: 0; font-size: 0.76rem; color: var(--ink-faint); }

/* ---------- pipeline (how it works) ---------- */

.pipeline {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  counter-reset: step;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.pipeline li {
  counter-increment: step;
  position: relative;
  padding-left: 44px;
}
.pipeline li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-muted);
}
.pipeline h3 { margin-bottom: 4px; }
.pipeline p { color: var(--ink-muted); max-width: 65ch; }

/* ---------- limits ---------- */

.limits { padding-left: 1.2em; max-width: 72ch; }
.limits li { margin-bottom: 10px; color: var(--ink-muted); }
.limits strong { color: var(--ink); }

/* ---------- real vs precomputed ---------- */

.real-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  margin-top: 20px;
}
.real-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--surface);
}
.real-card p { color: var(--ink-muted); font-size: 0.92rem; margin: 0; }

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

.site-footer {
  border-top: 1px solid var(--line);
  padding: 24px 0 40px;
}
.site-footer p {
  margin: 0;
  font-size: 0.8rem;
  color: var(--ink-faint);
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}