/* kcp-agent gh-pages site — visual language matched to the KCP spec site:
   Inter + JetBrains Mono, blue accent, light page, dark terminal panes. */

:root {
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --ink: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --term-bg: #0b1220;
  --term-ink: #dbe4f3;
  --term-dim: #7d8db0;
  --green: #34d399;
  --red: #f87171;
  --yellow: #fbbf24;
  --cyan: #67e8f9;
  --radius: 10px;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --sans: "Inter", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: var(--mono); font-size: 0.92em; }
h2 { font-size: 1.9rem; font-weight: 800; letter-spacing: -0.02em; margin: 0 0 0.4rem; }
h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: 1100px; margin: 0 auto; padding: 0.7rem 1.2rem;
  display: flex; align-items: center; justify-content: space-between;
}
.nav__brand { display: flex; align-items: center; gap: 0.15rem; color: var(--ink); font-weight: 700; }
.nav__brand:hover { text-decoration: none; }
.nav__dot--on { color: var(--blue); }
.nav__dot--off { color: #cbd5e1; }
.nav__name { margin-left: 0.45rem; font-family: var(--mono); }
.nav__links { display: flex; gap: 1.1rem; font-size: 0.92rem; font-weight: 500; flex-wrap: wrap; }
.nav__links a { color: var(--muted); }
.nav__links a:hover { color: var(--blue); }

/* ---------- hero ---------- */
.hero { max-width: 900px; margin: 0 auto; padding: 4.5rem 1.2rem 3rem; text-align: center; }
.hero__eyebrow {
  font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--blue); margin-bottom: 0.8rem;
}
.hero__title {
  font-size: clamp(2.2rem, 6vw, 3.8rem); font-weight: 800;
  letter-spacing: -0.03em; line-height: 1.08; margin: 0 0 1.1rem;
}
.hero__sub { font-size: 1.15rem; color: var(--muted); max-width: 44rem; margin: 0 auto 1.8rem; }
.hero__cta { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; margin-bottom: 2rem; }
.btn {
  display: inline-block; padding: 0.65rem 1.3rem; border-radius: var(--radius);
  font-weight: 600; font-size: 0.98rem;
}
.btn--primary { background: var(--blue); color: #fff; }
.btn--primary:hover { background: var(--blue-dark); text-decoration: none; }
.btn--code { background: var(--bg-alt); border: 1px solid var(--line); color: var(--ink); font-family: var(--mono); font-size: 0.88rem; }
.hero__proof {
  font-size: 0.95rem; color: var(--muted); max-width: 46rem; margin: 0 auto;
  border: 1px dashed var(--line); border-radius: var(--radius); padding: 0.9rem 1.1rem;
  background: var(--bg-alt);
}

/* ---------- sections ---------- */
.section { max-width: 1100px; margin: 0 auto; padding: 3.5rem 1.2rem; }
.section--alt { max-width: none; background: var(--bg-alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section--alt > * { max-width: 1100px; margin-left: auto; margin-right: auto; }
.section--alt h2, .section--alt .section__lead { padding-left: 0; }
.section__lead { color: var(--muted); max-width: 52rem; margin-top: 0; }

/* ---------- arena ---------- */
.tabs { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 1.6rem 0 1.2rem; }
.tab {
  font-family: var(--mono); font-size: 0.85rem; font-weight: 500;
  padding: 0.45rem 0.95rem; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line); background: var(--bg); color: var(--muted);
}
.tab:hover { border-color: var(--blue); color: var(--blue); }
.tab[aria-selected="true"] { background: var(--blue); border-color: var(--blue); color: #fff; }

.match__intro { color: var(--muted); max-width: 52rem; margin-bottom: 1rem; }
.match__controls {
  display: flex; gap: 1.4rem; align-items: center; flex-wrap: wrap;
  padding: 0.8rem 1rem; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg-alt); margin-bottom: 1rem; font-size: 0.92rem;
}
.match__controls label { display: flex; align-items: center; gap: 0.55rem; font-weight: 500; }
.match__controls .value { font-family: var(--mono); color: var(--blue); font-weight: 600; min-width: 6.5ch; }
.match__controls input[type="range"] { accent-color: var(--blue); width: 200px; }
.match__controls input[type="checkbox"] { accent-color: var(--blue); width: 1.05rem; height: 1.05rem; }
.match__controls textarea {
  font-family: var(--mono); font-size: 0.85rem; width: 100%; min-height: 5.2rem;
  border: 1px solid var(--line); border-radius: 8px; padding: 0.6rem 0.8rem; resize: vertical;
}
.match__controls .seg { display: flex; gap: 0.4rem; }
.seg button {
  font-family: var(--mono); font-size: 0.85rem; padding: 0.35rem 0.8rem;
  border-radius: 8px; border: 1px solid var(--line); background: var(--bg); cursor: pointer; color: var(--muted);
}
.seg button[aria-pressed="true"] { background: var(--blue); border-color: var(--blue); color: #fff; }

.match__panes { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; align-items: start; }
@media (max-width: 900px) { .match__panes { grid-template-columns: 1fr; } }

.pane { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); }
.pane--kcp { border-color: #bfdbfe; box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.12); }
.pane__head {
  display: flex; align-items: center; gap: 0.5rem; padding: 0.55rem 0.9rem;
  font-family: var(--mono); font-size: 0.85rem; font-weight: 600;
  background: var(--bg-alt); border-bottom: 1px solid var(--line);
}
.pane__mark { color: var(--blue); }
.pane__mark--foe { color: #94a3b8; }
.pane__badge {
  margin-left: auto; font-size: 0.68rem; font-weight: 600; letter-spacing: 0.04em;
  text-transform: uppercase; padding: 0.15rem 0.55rem; border-radius: 999px;
}
.pane__badge--real { background: #dbeafe; color: var(--blue-dark); }
.pane__badge--sim { background: #f1f5f9; color: var(--muted); }
.pane__body {
  background: var(--term-bg); color: var(--term-ink);
  font-family: var(--mono); font-size: 0.82rem; line-height: 1.55;
  padding: 0.9rem 1rem; min-height: 280px; white-space: pre-wrap; word-break: break-word;
}

/* plan rendering inside panes */
.u-green { color: var(--green); }
.u-red { color: var(--red); }
.u-yellow { color: var(--yellow); }
.u-cyan { color: var(--cyan); }
.u-dim { color: var(--term-dim); }
.u-bold { font-weight: 600; color: #fff; }
.u-strike { text-decoration: line-through; }
.pane__body details { margin-top: 0.8rem; }
.pane__body summary { cursor: pointer; color: var(--term-dim); }
.pane__body details pre { margin: 0.5rem 0 0; white-space: pre-wrap; color: var(--term-dim); }

.budgetbar { height: 6px; background: #1e293b; border-radius: 3px; margin: 0.35rem 0 0.8rem; overflow: hidden; }
.budgetbar__fill { height: 100%; background: var(--cyan); border-radius: 3px; }
.budgetbar__fill--over { background: var(--red); }

.match__verdict {
  margin-top: 1rem; padding: 0.8rem 1.1rem; border-left: 3px solid var(--blue);
  background: var(--bg-alt); border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--ink); font-size: 0.95rem;
}
.arena__footnote { font-size: 0.85rem; color: var(--muted); margin-top: 1.4rem; }

/* ---------- playground ---------- */
.playground { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; align-items: start; }
@media (max-width: 900px) { .playground { grid-template-columns: 1fr; } }
.playground textarea {
  font-family: var(--mono); font-size: 0.8rem; line-height: 1.55; width: 100%;
  min-height: 500px; resize: vertical; padding: 0.85rem 1rem;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--term-bg); color: var(--term-ink);
}
.playground .pane__body { min-height: 500px; }
.playground input[type="text"], .playground input[type="number"], .playground input[type="date"] {
  font-family: var(--mono); font-size: 0.85rem; border: 1px solid var(--line);
  border-radius: 8px; padding: 0.35rem 0.6rem; background: var(--bg); color: var(--ink);
}
.playground input[type="text"] { flex: 1; min-width: 11rem; }
.playground input[type="number"] { width: 5.5rem; }
.playground__toolbar { gap: 0.5rem; }
.seg-btn {
  font-family: var(--mono); font-size: 0.85rem; padding: 0.35rem 0.8rem;
  border-radius: 8px; border: 1px solid var(--line); background: var(--bg); cursor: pointer; color: var(--muted);
}
.seg-btn:hover { border-color: var(--blue); color: var(--blue); }

/* ---------- receipts / conformance ---------- */
.conformance { overflow-x: auto; margin-top: 1.4rem; }
.conformance table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.conformance th, .conformance td {
  text-align: left; vertical-align: top; padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--line);
}
.conformance th {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.05em;
  text-transform: uppercase; color: var(--muted); border-bottom: 2px solid var(--line);
}
.conformance td:nth-child(2) { font-family: var(--mono); white-space: nowrap; color: var(--blue-dark); }
.conformance td:nth-child(3) code { white-space: nowrap; }
.conformance .proof { display: block; color: var(--muted); }
.conformance .proof + .proof { margin-top: 0.2rem; }
.conformance .proof q { font-style: italic; }

/* ---------- pillars ---------- */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; margin-top: 1.6rem; }
@media (max-width: 900px) { .pillars { grid-template-columns: 1fr; } }
.pillar {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.2rem 1.3rem;
}
.pillar h3 { color: var(--blue-dark); }
.pillar p { margin: 0; font-size: 0.93rem; color: var(--muted); }

/* ---------- captures / install ---------- */
.capture {
  background: var(--term-bg); color: var(--term-ink); border-radius: var(--radius);
  padding: 1rem 1.2rem; overflow-x: auto; font-size: 0.84rem; line-height: 1.6;
}
.capture code { font-family: var(--mono); }
.capture__note { font-size: 0.85rem; color: var(--muted); }
.install p { color: var(--muted); font-size: 0.95rem; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 1.4rem 1.2rem; font-size: 0.88rem; color: var(--muted); }
.footer__inner { max-width: 1100px; margin: 0 auto; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.6rem; }