/* multi-agents.css — shared styles for content pages on multi-agents.site
   Pages: index.html, about.html, compare.html, guides.html, projects.html
   Five vibrant palettes are wired in ./theme.css (added after this file).
   Multi-color accents: --accent (primary), --accent-2, --accent-3, --accent-4
   cycle through accents on h2 numbers, ladder rungs, cards, notes, etc. */

/* === Aurora (default 五彩斑斓) — vibrant deep-night multi-color === */
:root {
  --bg: #0e0a26;
  --bg-card: #1a1138;
  --ink: #fef9c3;
  --ink-soft: #c7b8e8;
  --ink-mute: #8a7ca8;
  --accent: #f472b6;
  --accent-2: #c084fc;
  --accent-3: #60a5fa;
  --accent-4: #fbbf24;
  --accent-soft: rgba(244, 114, 182, 0.18);
  --accent-faint: rgba(244, 114, 182, 0.07);
  --rule: #2a1f4d;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  transition: background-color 0.25s ease, color 0.25s ease;
}

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: color 0.15s ease, border-color 0.15s ease; }
a:hover { color: var(--accent-2); border-bottom-color: var(--accent-soft); }

/* layout */
.page { max-width: 920px; margin: 0 auto; padding: 32px 24px 80px; }

/* header / nav */
header.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 24px; border-bottom: 1px solid var(--rule); margin-bottom: 40px;
  flex-wrap: wrap; gap: 12px;
}
.brand { color: var(--ink); border-bottom: 0; font-weight: 600; letter-spacing: -0.01em; font-size: 1.05rem; display: inline-flex; align-items: center; }
.brand:hover { color: var(--accent); }
.brand .symbol {
  background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3), var(--accent-4));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-right: 6px;
  font-weight: 700;
}
.symbol { font-size: 1.05em; }

.topbar-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
nav.tiny { font-size: 0.875rem; display: flex; gap: 18px; flex-wrap: wrap; }
nav.tiny a { color: var(--ink-soft); border-bottom: 0; }
nav.tiny a:hover { color: var(--accent); }
nav.tiny a.current { color: var(--accent); }

/* typography */
.eyebrow {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 12px;
}
h1 {
  font-size: clamp(2rem, 5vw, 2.85rem);
  font-weight: 700; letter-spacing: -0.02em; line-height: 1.1;
  margin: 0 0 16px;
}
h1 .accent {
  background: linear-gradient(90deg, var(--accent), var(--accent-2) 40%, var(--accent-3) 75%, var(--accent-4));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
h2 {
  font-size: 1.35rem; font-weight: 600; letter-spacing: -0.01em;
  margin: 56px 0 14px;
}
h2 .num {
  font-family: ui-monospace, monospace; font-size: 0.85rem;
  margin-right: 10px; vertical-align: middle;
  display: inline-block;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--accent-faint);
  color: var(--accent);
  border: 1px solid var(--accent-soft);
}
/* Cycle the section-number chip through all four accents */
h2:nth-of-type(5n+1) .num { color: var(--accent);   border-color: rgba(var(--accent-rgb),   0.35); background: rgba(var(--accent-rgb),   0.10); }
h2:nth-of-type(5n+2) .num { color: var(--accent-2); border-color: rgba(var(--accent-2-rgb), 0.35); background: rgba(var(--accent-2-rgb), 0.10); }
h2:nth-of-type(5n+3) .num { color: var(--accent-3); border-color: rgba(var(--accent-3-rgb), 0.35); background: rgba(var(--accent-3-rgb), 0.10); }
h2:nth-of-type(5n+4) .num { color: var(--accent-4); border-color: rgba(var(--accent-4-rgb), 0.40); background: rgba(var(--accent-4-rgb), 0.12); }
h2:nth-of-type(5n+5) .num { color: var(--accent);   border-color: rgba(var(--accent-rgb),   0.35); background: rgba(var(--accent-rgb),   0.10); }

h3 { font-size: 1rem; font-weight: 600; margin: 0 0 6px; }
p { margin: 0 0 14px; color: var(--ink); }
.lede { font-size: 1.15rem; color: var(--ink-soft); max-width: 62ch; }

/* code */
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85em;
  background: var(--accent-faint);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--accent);
  border: 1px solid var(--accent-soft);
}

/* cards */
.cards {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin: 24px 0 8px;
}
.card {
  background: var(--bg-card); border: 1px solid var(--rule);
  border-radius: 12px; padding: 20px;
  transition: border-color 0.15s ease, transform 0.15s ease;
  position: relative;
}
.card:hover { border-color: var(--accent-soft); transform: translateY(-1px); }
.card h3 { margin: 0 0 6px; font-size: 1rem; font-weight: 600; }
.card .pill {
  display: inline-block; font-family: ui-monospace, monospace; font-size: 0.7rem;
  padding: 3px 10px; border-radius: 999px; margin-bottom: 10px;
  font-weight: 600; letter-spacing: 0.04em;
}
/* Cycle pill colors through the four accents */
.cards .card:nth-child(4n+1) .pill { color: var(--accent);   background: rgba(var(--accent-rgb),   0.14); border: 1px solid rgba(var(--accent-rgb),   0.32); }
.cards .card:nth-child(4n+2) .pill { color: var(--accent-2); background: rgba(var(--accent-2-rgb), 0.14); border: 1px solid rgba(var(--accent-2-rgb), 0.32); }
.cards .card:nth-child(4n+3) .pill { color: var(--accent-3); background: rgba(var(--accent-3-rgb), 0.14); border: 1px solid rgba(var(--accent-3-rgb), 0.32); }
.cards .card:nth-child(4n+4) .pill { color: var(--accent-4); background: rgba(var(--accent-4-rgb), 0.16); border: 1px solid rgba(var(--accent-4-rgb), 0.36); }

.card p { font-size: 0.9rem; color: var(--ink-soft); margin: 0 0 12px; }
.card a.more {
  display: inline-block; font-size: 0.875rem; color: var(--accent);
  border-bottom: 1px solid var(--accent-soft); padding-bottom: 1px;
  font-weight: 500;
}

/* notes */
.notes { display: grid; gap: 18px; margin: 16px 0 0; }
.note { padding: 4px 0 4px 16px; border-left: 3px solid var(--accent); }
.note h3 { margin: 0 0 4px; font-size: 1rem; font-weight: 600; }
.note p { font-size: 0.92rem; color: var(--ink-soft); margin: 0; }
/* Cycle note left borders through the four accents */
.notes .note:nth-child(4n+1) { border-left-color: var(--accent); }
.notes .note:nth-child(4n+2) { border-left-color: var(--accent-2); }
.notes .note:nth-child(4n+3) { border-left-color: var(--accent-3); }
.notes .note:nth-child(4n+4) { border-left-color: var(--accent-4); }

/* glossary */
.glossary { margin: 20px 0 8px; }
.glossary dl { margin: 0; display: grid; grid-template-columns: 180px 1fr; gap: 12px 24px; }
.glossary dt {
  font-family: ui-monospace, monospace; font-size: 0.85rem;
  color: var(--accent); font-weight: 600; padding-top: 2px;
}
/* Cycle glossary term colors */
.glossary dt:nth-child(8n+1) { color: var(--accent); }
.glossary dt:nth-child(8n+3) { color: var(--accent-2); }
.glossary dt:nth-child(8n+5) { color: var(--accent-3); }
.glossary dt:nth-child(8n+7) { color: var(--accent-4); }
.glossary dd { margin: 0; color: var(--ink-soft); font-size: 0.92rem; }
@media (max-width: 640px) {
  .glossary dl { grid-template-columns: 1fr; gap: 4px 0; }
  .glossary dt { padding-top: 12px; }
}

/* table */
table.patterns {
  width: 100%; border-collapse: collapse; margin: 16px 0 8px;
  background: var(--bg-card); border: 1px solid var(--rule);
  border-radius: 8px; overflow: hidden; font-size: 0.9rem;
}
table.patterns th, table.patterns td {
  text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
table.patterns th {
  font-family: ui-monospace, monospace; font-size: 0.72rem;
  color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em;
  background: var(--accent-faint);
}
table.patterns tr:last-child td { border-bottom: 0; }
table.patterns td:first-child {
  font-family: ui-monospace, monospace; color: var(--accent); font-weight: 700;
  white-space: nowrap;
}
table.patterns tbody tr:nth-child(odd) td:first-child { color: var(--accent); }
table.patterns tbody tr:nth-child(3n+1) td:first-child { color: var(--accent); }
table.patterns tbody tr:nth-child(3n+2) td:first-child { color: var(--accent-2); }
table.patterns tbody tr:nth-child(3n+3) td:first-child { color: var(--accent-3); }
table.patterns td:nth-child(2) { color: var(--ink-soft); }

/* FAQ */
.faq { margin: 16px 0 8px; }
.faq details {
  background: var(--bg-card); border: 1px solid var(--rule);
  border-radius: 6px; padding: 14px 18px; margin-bottom: 10px;
}
.faq summary {
  cursor: pointer; font-weight: 600; color: var(--ink);
  list-style: none; display: flex; justify-content: space-between; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; color: var(--accent); font-family: ui-monospace, monospace;
  font-weight: 400; transition: transform 0.15s ease;
}
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 12px 0 0; color: var(--ink-soft); font-size: 0.93rem; }

/* ladder */
.ladder {
  display: grid; gap: 0; margin: 20px 0 8px;
  border: 1px solid var(--rule); border-radius: 8px; overflow: hidden;
}
.ladder .rung { display: grid; grid-template-columns: 64px 1fr; gap: 0; padding: 0; }
.ladder .rung + .rung { border-top: 1px solid var(--rule); }
.ladder .lvl {
  padding: 18px 12px;
  font-family: ui-monospace, monospace; font-size: 0.72rem;
  text-align: center; letter-spacing: 0.08em;
  border-right: 1px solid var(--rule);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
}
/* Cycle ladder rungs through the four accents */
.ladder .rung:nth-child(4n+1) .lvl { color: var(--accent);   background: rgba(var(--accent-rgb),   0.10); }
.ladder .rung:nth-child(4n+2) .lvl { color: var(--accent-2); background: rgba(var(--accent-2-rgb), 0.10); }
.ladder .rung:nth-child(4n+3) .lvl { color: var(--accent-3); background: rgba(var(--accent-3-rgb), 0.10); }
.ladder .rung:nth-child(4n+4) .lvl { color: var(--accent-4); background: rgba(var(--accent-4-rgb), 0.12); }

.ladder .body { padding: 18px 18px; }
.ladder .body h3 { margin: 0 0 4px; font-size: 0.98rem; }
.ladder .body p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }

/* hero CTA */
.hero-cta { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.hero-cta .primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #ffffff; border-bottom: 0; font-weight: 700;
  border-radius: 6px; font-size: 1rem;
  transition: filter 0.15s ease, transform 0.15s ease;
  text-shadow: 0 1px 2px rgba(0,0,0,0.18);
}
.hero-cta .primary:hover { filter: brightness(1.12); transform: translateY(-1px); }
.hero-cta .primary::after { content: "→"; font-weight: 400; }
.hero-cta .secondary {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 12px 18px; background: transparent; color: var(--ink-soft);
  border-bottom: 0; font-weight: 500; border-radius: 6px;
  border: 1px solid var(--rule); font-size: 0.95rem;
}
.hero-cta .secondary:hover { color: var(--ink); border-color: var(--accent-soft); }
.hero-cta .path {
  font-family: ui-monospace, monospace; font-size: 0.78rem;
  color: var(--ink-mute); margin-left: auto;
}

/* pages-grid: a 4-card grid linking to about/compare/guides/projects */
.pages-grid {
  display: grid; gap: 16px; margin: 20px 0 8px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.pages-grid .page-card {
  background: var(--bg-card); border: 1px solid var(--rule);
  border-radius: 12px; padding: 18px; transition: border-color 0.15s ease, transform 0.15s ease;
}
.pages-grid .page-card:hover { border-color: var(--accent-soft); transform: translateY(-1px); }
.pages-grid .page-card .tag {
  font-family: ui-monospace, monospace; font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase; margin-bottom: 6px;
  font-weight: 700;
}
.pages-grid .page-card:nth-child(4n+1) .tag { color: var(--accent); }
.pages-grid .page-card:nth-child(4n+2) .tag { color: var(--accent-2); }
.pages-grid .page-card:nth-child(4n+3) .tag { color: var(--accent-3); }
.pages-grid .page-card:nth-child(4n+4) .tag { color: var(--accent-4); }
.pages-grid .page-card h3 { margin: 0 0 4px; font-size: 1rem; }
.pages-grid .page-card p { font-size: 0.88rem; color: var(--ink-soft); margin: 0; }

/* CTA strip */
.cta {
  margin-top: 56px; padding: 28px; text-align: center;
  background: linear-gradient(135deg, var(--accent-soft), var(--accent-faint));
  border: 1px solid var(--accent-soft);
  border-radius: 14px;
}
.cta p { margin: 0 0 14px; color: var(--ink-soft); font-size: 0.95rem; }
.cta a {
  display: inline-block; padding: 12px 24px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #ffffff; border-bottom: 0; font-weight: 700;
  border-radius: 6px; font-size: 0.95rem;
  text-shadow: 0 1px 2px rgba(0,0,0,0.18);
  transition: filter 0.15s ease, transform 0.15s ease;
}
.cta a:hover { filter: brightness(1.12); transform: translateY(-1px); }

/* footer */
footer {
  margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--rule);
  font-size: 0.85rem; color: var(--ink-mute);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}
footer a { color: var(--ink-soft); border-bottom: 0; }
footer a:hover { color: var(--accent); }
footer .accent {
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 700;
}

@media (max-width: 600px) {
  .ladder .rung { grid-template-columns: 1fr; }
  .ladder .lvl { border-right: 0; border-bottom: 1px solid var(--rule); padding: 10px; }
  header.topbar { flex-direction: column; align-items: flex-start; gap: 12px; }
  .topbar-actions { width: 100%; justify-content: space-between; }
}

/* page-specific helpers */
.toc {
  background: var(--bg-card); border: 1px solid var(--rule);
  border-radius: 12px; padding: 18px 22px; margin: 16px 0 8px;
}
.toc h3 {
  font-family: ui-monospace, monospace; font-size: 0.7rem;
  color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase;
  margin: 0 0 10px;
}
.toc ul { list-style: none; padding: 0; margin: 0; }
.toc li { font-size: 0.9rem; color: var(--ink-soft); margin-bottom: 6px; }
.toc li:last-child { margin-bottom: 0; }
.toc li::before { content: "→"; color: var(--accent); margin-right: 8px; }
.toc a { color: var(--ink-soft); border-bottom: 0; }
.toc a:hover { color: var(--accent); }

.tag-row { display: flex; gap: 6px; flex-wrap: wrap; margin: 8px 0 16px; }
.tag-row .tag {
  font-family: ui-monospace, monospace; font-size: 0.7rem;
  padding: 3px 10px; border-radius: 999px;
  font-weight: 600;
}
.tag-row .tag:nth-child(4n+1) { color: var(--accent);   background: rgba(var(--accent-rgb),   0.12); border: 1px solid rgba(var(--accent-rgb),   0.32); }
.tag-row .tag:nth-child(4n+2) { color: var(--accent-2); background: rgba(var(--accent-2-rgb), 0.12); border: 1px solid rgba(var(--accent-2-rgb), 0.32); }
.tag-row .tag:nth-child(4n+3) { color: var(--accent-3); background: rgba(var(--accent-3-rgb), 0.12); border: 1px solid rgba(var(--accent-3-rgb), 0.32); }
.tag-row .tag:nth-child(4n+4) { color: var(--accent-4); background: rgba(var(--accent-4-rgb), 0.14); border: 1px solid rgba(var(--accent-4-rgb), 0.36); }

.kv {
  display: grid; grid-template-columns: 160px 1fr;
  gap: 8px 24px; margin: 16px 0; font-size: 0.92rem;
}
.kv dt {
  font-family: ui-monospace, monospace; color: var(--accent);
  font-weight: 600; font-size: 0.85rem;
}
.kv dt:nth-child(8n+1) { color: var(--accent); }
.kv dt:nth-child(8n+3) { color: var(--accent-2); }
.kv dt:nth-child(8n+5) { color: var(--accent-3); }
.kv dt:nth-child(8n+7) { color: var(--accent-4); }
.kv dd { margin: 0; color: var(--ink-soft); }
@media (max-width: 600px) { .kv { grid-template-columns: 1fr; gap: 2px 0; } .kv dt { padding-top: 10px; } }

/* === Theme picker (inline variant for topbar pages) ===
   The .theme-picker markup itself ships in theme.css; this block just
   ensures the inline (non-fixed) variant sits nicely inside .topbar-actions. */
.topbar-actions .theme-picker { margin-left: 4px; }