:root {
  --bg: #f7f4ec;
  --bg-card: #fffdf6;
  --fg: #1f2a44;
  --fg-dim: #5b6478;
  --accent: #b6411f;
  --accent-2: #ffd166;
  --accent-3: #4a6da7;
  --rule: #e2dccb;
  --code-bg: #f0ead8;
  --code-fg: #5a2a14;
  --table-head: #efe6cf;
  --table-zebra: #faf6e8;
  --link: #b6411f;
  --shadow: 0 2px 6px rgba(60, 40, 20, .07);
  --realm-mortal: #8ba888;
  --realm-immortal: #c9a849;
  --realm-god: #7a6cb3;
  --realm-truegod: #b54050;
  --realm-dao: #2a2a3a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14151a;
    --bg-card: #1c1e25;
    --fg: #e8e6df;
    --fg-dim: #9aa0ad;
    --accent: #ffb27a;
    --accent-2: #ffd166;
    --accent-3: #8aa6e0;
    --rule: #2a2d36;
    --code-bg: #2a2d36;
    --code-fg: #ffd9a3;
    --table-head: #232732;
    --table-zebra: #1f222a;
    --link: #ffb27a;
    --shadow: 0 2px 6px rgba(0, 0, 0, .35);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", "Segoe UI", Roboto, sans-serif;
  line-height: 1.75;
  font-size: 16px;
}
nav.topbar {
  background: linear-gradient(135deg, #1f2a44 0%, #2a3a5e 100%);
  border-bottom: 3px solid var(--accent-2);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
}
nav.topbar .brand {
  color: #fffdf6;
  font-family: "Noto Serif TC", "PingFang TC", "Songti TC", serif;
  font-weight: 600;
  font-size: 16px;
  letter-spacing: .04em;
}
nav.topbar .brand .seal {
  display: inline-block;
  background: var(--accent-2);
  color: #1f2a44;
  padding: 2px 6px;
  border-radius: 4px;
  margin-right: 8px;
  font-size: 13px;
}
nav.topbar a {
  color: #d8d4c0;
  text-decoration: none;
  font-size: 14px;
  padding: 6px 10px;
  border-radius: 6px;
  transition: background .15s ease, color .15s ease;
}
nav.topbar a:hover { color: var(--accent-2); background: rgba(255,255,255,.05); }
nav.topbar a.active { color: var(--accent-2); background: rgba(255,255,255,.08); }
nav.topbar .spacer { flex: 1; }
nav.topbar .meta { color: #8893a8; font-size: 12px; }
.layout { display: grid; grid-template-columns: 280px 1fr; gap: 32px; max-width: 1280px; margin: 0 auto; padding: 24px; }
aside.toc {
  position: sticky;
  top: 76px;
  align-self: start;
  max-height: calc(100vh - 96px);
  overflow-y: auto;
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 20px 22px;
  box-shadow: var(--shadow);
}
aside.toc h3 {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
aside.toc ol { list-style: none; padding: 0; margin: 0; counter-reset: toc; }
aside.toc li { counter-increment: toc; margin: 4px 0; }
aside.toc li a {
  display: block;
  color: var(--fg);
  text-decoration: none;
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 14px;
  line-height: 1.45;
}
aside.toc li a:hover { background: var(--code-bg); color: var(--link); }
aside.toc li a::before { content: counter(toc) ". "; color: var(--fg-dim); margin-right: 4px; }
main {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 36px 42px;
  box-shadow: var(--shadow);
  min-width: 0;
}
header.banner {
  background: linear-gradient(135deg, #1f2a44 0%, #2a3a5e 60%, #b6411f 100%);
  color: #fffdf6;
  padding: 28px 32px;
  border-radius: 12px 12px 0 0;
  margin: -36px -42px 24px;
  border-bottom: 4px solid var(--accent-2);
}
header.banner .eyebrow {
  font-size: 12px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 6px;
}
header.banner h1 { margin: 0; font-size: 26px; font-weight: 700; letter-spacing: .02em; }
header.banner p { margin: 8px 0 0; opacity: .85; font-size: 14px; }
h1, h2, h3 { font-family: "Noto Serif TC", "PingFang TC", "Songti TC", serif; font-weight: 600; }
main > h1 { font-size: 28px; margin: 0 0 8px; }
h2 {
  margin: 40px 0 12px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 22px;
  color: var(--accent);
  position: relative;
}
h2:first-of-type { border-top: 0; padding-top: 0; }
h2 .anchor {
  margin-left: 8px;
  color: var(--fg-dim);
  text-decoration: none;
  opacity: 0;
  font-size: .8em;
  transition: opacity .15s ease;
}
h2:hover .anchor { opacity: 1; }
h3 { font-size: 18px; margin: 24px 0 8px; color: var(--accent); }
h4 { font-size: 15px; margin: 18px 0 6px; color: var(--accent-3); }
p { margin: 12px 0; }
p.meta { color: var(--fg-dim); font-size: 13px; }
a { color: var(--link); }
code {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: .9em;
  font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
}
pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 14px 16px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.6;
}
pre code { background: transparent; padding: 0; }
ul, ol { padding-left: 28px; }
li { margin: 4px 0; }
table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
  font-size: 14px;
  background: var(--bg-card);
}
thead { background: var(--table-head); }
th, td {
  border: 1px solid var(--rule);
  padding: 8px 12px;
  text-align: left;
  vertical-align: top;
}
th { font-weight: 600; color: var(--accent); }
tbody tr:nth-child(even) { background: var(--table-zebra); }
td:last-child:empty::after { content: "—"; color: var(--fg-dim); }
table code { font-size: 12px; padding: 1px 5px; }
strong { color: var(--fg); }
blockquote {
  border-left: 4px solid var(--accent-2);
  background: var(--code-bg);
  padding: 12px 18px;
  margin: 16px 0;
  color: var(--fg);
  border-radius: 0 8px 8px 0;
}
hr { border: 0; border-top: 1px solid var(--rule); margin: 32px 0; }
footer.foot {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  color: var(--fg-dim);
  font-size: 13px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
}

/* Architecture-specific helpers */
.callout {
  background: linear-gradient(135deg, #fff6e0 0%, #ffeec3 100%);
  border-left: 5px solid var(--accent-2);
  padding: 18px 22px;
  border-radius: 8px;
  margin: 18px 0;
  color: #5a3a14;
  font-size: 15px;
}
@media (prefers-color-scheme: dark) {
  .callout { background: linear-gradient(135deg, #3a2e14 0%, #4a3a18 100%); color: #ffd9a3; }
}
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin: 20px 0;
}
.kpi {
  background: var(--code-bg);
  border-radius: 10px;
  padding: 16px 18px;
  border: 1px solid var(--rule);
}
.kpi .num { font-size: 26px; font-weight: 700; color: var(--accent); font-family: "Noto Serif TC", serif; }
.kpi .label { color: var(--fg-dim); font-size: 13px; margin-top: 4px; }
.realm-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin: 20px 0;
}
.realm {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 14px 12px;
  text-align: center;
  position: relative;
}
.realm .name {
  font-family: "Noto Serif TC", serif;
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}
.realm .mul { font-size: 13px; color: var(--fg-dim); }
.realm .cond { font-size: 12px; color: var(--fg-dim); margin-top: 6px; }
.realm.mortal { border-top: 4px solid var(--realm-mortal); }
.realm.immortal { border-top: 4px solid var(--realm-immortal); }
.realm.god { border-top: 4px solid var(--realm-god); }
.realm.truegod { border-top: 4px solid var(--realm-truegod); }
.realm.dao { border-top: 4px solid var(--realm-dao); }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  margin: 20px 0;
}
.feat-card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
}
.feat-card .tag {
  display: inline-block;
  font-size: 11px;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--accent-2);
  color: #1f2a44;
  font-weight: 600;
  letter-spacing: .04em;
  margin-bottom: 8px;
}
.feat-card h4 { margin: 0 0 6px; font-size: 14px; color: var(--accent); font-family: inherit; }
.feat-card p { margin: 0; font-size: 13px; color: var(--fg-dim); line-height: 1.6; }
.tier-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin: 16px 0;
}
.tier-flow .tier {
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 13px;
  font-family: "JetBrains Mono", monospace;
}
.tier-flow .arr { color: var(--fg-dim); font-size: 16px; }
.mermaid { background: var(--bg-card); border-radius: 10px; padding: 10px; margin: 20px 0; }
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 20px 0;
}
.compare-grid > div {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 16px 18px;
}
.compare-grid h4 { margin-top: 0; }
.compare-grid.bad h4 { color: #b54050; }
.compare-grid.good h4 { color: #2a8a4e; }

/* Tab navigation for features.html */
.tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  border-bottom: 2px solid var(--rule);
  margin: 0 0 24px;
  padding-bottom: 0;
}
.tabs button {
  appearance: none;
  background: transparent;
  border: 0;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--fg-dim);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  font-family: inherit;
  font-weight: 500;
}
.tabs button:hover { color: var(--fg); }
.tabs button.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; padding: 16px; gap: 16px; }
  aside.toc { position: static; max-height: none; }
  main { padding: 24px; }
  header.banner { margin: -24px -24px 18px; padding: 22px 24px; }
  header.banner h1 { font-size: 21px; }
  h2 { font-size: 19px; }
  table { font-size: 13px; }
  th, td { padding: 6px 8px; }
  .realm-row { grid-template-columns: repeat(2, 1fr); }
  nav.topbar { padding: 10px 14px; gap: 8px; }
  nav.topbar .meta { display: none; }
}
@media print {
  body { background: white; color: black; }
  aside.toc, header.banner, nav.topbar { display: none; }
  .layout { display: block; padding: 0; max-width: none; }
  main { box-shadow: none; border: 0; padding: 0; }
  h2, h3 { color: black; page-break-after: avoid; }
  a { color: black; text-decoration: none; }
  table { font-size: 11px; }
  pre, code { background: #f5f5f5; color: black; }
}