:root {
  --bg: #fbfcfd;
  --bg-alt: #f1f5f9;
  --ink: #15202b;
  --ink-soft: #475569;
  --ink-faint: #94a3b8;
  --line: #e2e8f0;
  --accent: #0891b2;
  --accent-soft: #cffafe;
  --card: #ffffff;
  --term-bg: #0e1116;
  --term-ink: #d7dde4;
  --radius: 14px;
  --maxw: 980px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: var(--mono); font-size: 0.875em; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1rem, 4vw, 2rem);
  background: rgba(251, 252, 253, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 0.55rem; font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-badge {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 0.8rem;
  color: #fff;
  background: var(--accent);
  padding: 0.18rem 0.45rem;
  border-radius: 7px;
  letter-spacing: 0.02em;
}
.brand-name { color: var(--ink); letter-spacing: 0.04em; }
.site-nav { display: flex; gap: clamp(0.6rem, 2.5vw, 1.6rem); font-size: 0.92rem; }
.site-nav a { color: var(--ink-soft); font-weight: 500; }
.site-nav a:hover { color: var(--accent); text-decoration: none; }
.nav-paper {
  color: var(--accent) !important;
  font-weight: 600;
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--accent);
  border-radius: 8px;
}
.nav-paper:hover { background: var(--accent); color: #fff !important; text-decoration: none; }
@media (max-width: 620px) { .site-nav { display: none; } }

/* ---------- hero ---------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 5.5rem) clamp(1rem, 4vw, 2rem) 2rem;
  text-align: center;
}
.eyebrow {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.74rem;
  color: var(--accent);
  margin: 0 0 1rem;
}
.hero h1 {
  font-size: clamp(2rem, 5.4vw, 3.3rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 1.2rem;
  font-weight: 700;
}
.accent { color: var(--accent); }
.lede {
  max-width: 660px;
  margin: 0 auto 1.8rem;
  font-size: clamp(1rem, 2.2vw, 1.18rem);
  color: var(--ink-soft);
}
.hero-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.08s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn.primary { background: var(--accent); color: #fff; box-shadow: 0 6px 18px -6px rgba(8, 145, 178, 0.6); }
.btn.primary:hover { background: #0aa3c7; }
.btn.ghost { color: var(--ink); border: 1px solid var(--line); background: #fff; }
.btn.ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- terminal ---------- */
.terminal {
  max-width: 660px;
  margin: 2.6rem auto 0;
  text-align: left;
  background: var(--term-bg);
  border-radius: var(--radius);
  box-shadow: 0 24px 60px -28px rgba(15, 23, 42, 0.55);
  overflow: hidden;
  border: 1px solid #1f2933;
}
.terminal-bar { display: flex; gap: 0.45rem; padding: 0.7rem 0.9rem; background: #161b22; }
.terminal-bar span { width: 11px; height: 11px; border-radius: 50%; background: #30363d; }
.terminal-bar span:first-child { background: #ff5f57; }
.terminal-bar span:nth-child(2) { background: #febc2e; }
.terminal-bar span:nth-child(3) { background: #28c840; }
.terminal-body {
  margin: 0;
  padding: 1.1rem 1.3rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--term-ink);
  overflow-x: auto;
}
.terminal-body.plain {
  background: var(--term-bg);
  border-radius: var(--radius);
  border: 1px solid #1f2933;
}
.c-dim { color: #7d8794; }
.c-cmd { color: #7ee0f7; }
.c-badge { color: #22d3ee; font-weight: 600; }
.c-ok { color: #4ade80; }
.c-frame { color: #5b6673; }
.c-strong { color: #e6edf3; font-weight: 600; }
.c-num { color: #38bdf8; }
.c-bar { color: #22d3ee; }

/* ---------- bands ---------- */
.band {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 4.5rem) clamp(1rem, 4vw, 2rem);
}
.band.alt {
  max-width: none;
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.band.alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.band h2 {
  font-size: clamp(1.5rem, 3.4vw, 2.05rem);
  letter-spacing: -0.01em;
  margin: 0 0 0.6rem;
}
.section-lede { color: var(--ink-soft); max-width: 680px; margin: 0 0 2rem; font-size: 1.05rem; }

/* ---------- cards ---------- */
.cards { display: grid; gap: 1.1rem; }
.cards.three { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 720px) { .cards.three { grid-template-columns: 1fr; } }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem;
  transition: border-color 0.2s ease, transform 0.1s ease, box-shadow 0.2s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 14px 30px -20px rgba(8, 145, 178, 0.5); }
.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px; height: 38px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.1rem;
  margin-bottom: 0.8rem;
}
.card h3 { margin: 0 0 0.4rem; font-size: 1.15rem; }
.card p { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }
.card.cmd { padding-top: 1.2rem; }
.cmd-name {
  display: inline-block;
  font-family: var(--mono);
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.3rem 0.6rem;
  border-radius: 8px;
  margin-bottom: 0.8rem;
  font-size: 0.9rem;
}

/* ---------- diagram ---------- */
.diagram {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
  overflow-x: auto;
}
.diagram svg { width: 100%; height: auto; min-width: 640px; display: block; }
.node rect { fill: #fff; stroke: var(--line); stroke-width: 1.6; }
.node.spec rect { fill: #ecfeff; stroke: var(--accent); }
.node.step rect { fill: #fff; stroke: #cbd5e1; }
.n-title { font-family: var(--mono); font-weight: 600; font-size: 19px; fill: var(--ink); }
.n-cmd { font-family: var(--mono); font-weight: 600; font-size: 18px; fill: var(--accent); }
.n-line { font-family: var(--mono); font-size: 12px; fill: var(--ink-soft); }
.n-sub { font-size: 13px; fill: var(--ink-soft); }
.agent rect { fill: #0e1116; stroke: #0e1116; }
.agent text { fill: #cbd5e1; font-family: var(--mono); font-size: 14px; font-weight: 500; }
.loop-label { fill: var(--ink-faint); font-size: 12px; font-style: italic; }

.diagram-caption { color: var(--ink-soft); font-size: 0.95rem; margin-top: 1.2rem; }
.mono { font-family: var(--mono); color: var(--ink); font-size: 0.9em; }
.tag {
  font-family: var(--mono);
  font-size: 0.82em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.05rem 0.4rem;
  border-radius: 6px;
}

/* ---------- layout grid ---------- */
.layout-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 1.5rem; align-items: start; }
@media (max-width: 760px) { .layout-grid { grid-template-columns: 1fr; } }
.tree {
  margin: 0;
  background: var(--term-bg);
  color: var(--term-ink);
  border-radius: var(--radius);
  padding: 1.2rem 1.3rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.75;
  overflow-x: auto;
  border: 1px solid #1f2933;
}
.t-dir { color: #7ee0f7; font-weight: 600; }
.t-file { color: #e6edf3; }
.t-line { color: #5b6673; }
.t-cmt { color: #7d8794; }
.layout-notes h3 { margin: 0.2rem 0 0.7rem; font-size: 1.1rem; }
.layout-notes ul { margin: 0; padding-left: 1.1rem; color: var(--ink-soft); }
.layout-notes li { margin-bottom: 0.5rem; }
.layout-notes .note { color: var(--ink-faint); font-size: 0.9rem; margin-top: 1rem; }

/* ---------- pills ---------- */
.agent-pills { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 1.8rem; }
.pill {
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--ink-soft);
}
.pill.alt { background: var(--accent); color: #fff; border-color: var(--accent); font-family: var(--mono); }

/* ---------- footer ---------- */
.site-footer {
  text-align: center;
  padding: 2.5rem 1rem 3rem;
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
}
.site-footer .brand { justify-content: center; margin-bottom: 0.6rem; }
.site-footer p { margin: 0; color: var(--ink-faint); font-size: 0.9rem; }