:root {
  color-scheme: dark;
  --bg: #071018;
  --panel: #0c1822;
  --panel-2: #10222e;
  --line: #223743;
  --text: #e8f1f5;
  --muted: #a6bac4;
  --green: #65e0b7;
  --blue: #7ab8ff;
  --amber: #ffc978;
  --danger: #ff8f94;
  --sidebar: 19rem;
  font-family: "Segoe UI", "Noto Sans SC", "Microsoft YaHei UI", system-ui, sans-serif;
  font-size: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
}
a { color: var(--blue); text-underline-offset: .2em; }
a:hover { color: #add3ff; }
.skip-link {
  position: fixed;
  top: .75rem;
  left: .75rem;
  z-index: 20;
  padding: .65rem 1rem;
  transform: translateY(-180%);
  background: var(--green);
  color: #04110d;
  border-radius: .5rem;
}
.skip-link:focus { transform: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar);
  z-index: 10;
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1rem;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  background: #08141d;
}
.brand {
  display: flex;
  gap: .75rem;
  align-items: center;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
  font-size: 1.05rem;
}
.brand-mark {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  border: 1px solid #65e0b766;
  border-radius: .65rem;
  color: var(--green);
  background: #65e0b70d;
  font-family: Consolas, monospace;
}
.nav-search input {
  width: 100%;
  margin: 1.25rem 0 .75rem;
  padding: .7rem .8rem;
  border: 1px solid var(--line);
  border-radius: .55rem;
  background: #061019;
  color: var(--text);
  font: inherit;
}
.nav-search input:focus { outline: 2px solid var(--green); outline-offset: 2px; }
.nav-heading {
  margin: 1rem .55rem .4rem;
  color: #718d99;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.nav-link {
  display: block;
  padding: .48rem .6rem;
  border-left: 2px solid transparent;
  color: var(--muted);
  text-decoration: none;
  font-size: .88rem;
  line-height: 1.35;
}
.nav-link:hover, .nav-link.active {
  border-left-color: var(--green);
  color: var(--text);
  background: #65e0b70a;
}
.sidebar-note {
  display: grid;
  gap: .15rem;
  margin-top: auto;
  padding: .8rem;
  border: 1px solid #65e0b733;
  border-radius: .65rem;
  color: var(--muted);
  font-size: .78rem;
}
.sidebar-note strong { color: var(--green); }
.page { margin-left: var(--sidebar); min-width: 0; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  min-height: 3.5rem;
  padding: .65rem 2rem;
  border-bottom: 1px solid var(--line);
  background: #071018e8;
  backdrop-filter: blur(16px);
  color: var(--muted);
  font-size: .82rem;
}
.verified-dot {
  display: inline-block;
  width: .55rem;
  height: .55rem;
  margin-right: .45rem;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 .2rem #65e0b71c;
}
.menu-button {
  display: none;
  border: 1px solid var(--line);
  border-radius: .45rem;
  background: var(--panel);
  color: var(--text);
  padding: .45rem .7rem;
}
.content, .home {
  width: min(100%, 78rem);
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 5rem);
}
.content { width: min(100%, 66rem); }
.prose h1 {
  margin: 0 0 1.5rem;
  color: #f4fbff;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.15;
  letter-spacing: -.035em;
}
.prose h2 {
  margin: 3rem 0 1rem;
  padding-top: .35rem;
  border-top: 1px solid var(--line);
  color: #f3f8fa;
  font-size: 1.5rem;
  line-height: 1.3;
}
.prose h3 { margin-top: 2rem; color: var(--green); }
.prose p, .prose li { color: #c7d5dc; }
.prose strong { color: #f5fbfd; }
.prose blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--amber);
  background: #ffc9780d;
  color: #e9d2ad;
}
.prose code {
  padding: .13em .38em;
  border: 1px solid #29414e;
  border-radius: .35rem;
  background: #061019;
  color: #99efd2;
  font-family: Consolas, "Cascadia Code", monospace;
  font-size: .9em;
}
.code-block {
  position: relative;
  margin: 1.35rem 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: .75rem;
  background: #030a0f;
}
.code-label {
  padding: .45rem .8rem;
  border-bottom: 1px solid #172a35;
  color: #718d99;
  font: .72rem Consolas, monospace;
  text-transform: uppercase;
}
.code-block pre {
  margin: 0;
  padding: 1.15rem;
  overflow: auto;
  line-height: 1.55;
  tab-size: 2;
}
.code-block pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: #d8e8ee;
}
.copy-button {
  position: absolute;
  top: .33rem;
  right: .45rem;
  padding: .25rem .55rem;
  border: 1px solid #2a4553;
  border-radius: .35rem;
  background: #0d1b24;
  color: var(--muted);
  cursor: pointer;
  font-size: .72rem;
}
.copy-button:hover, .copy-button:focus { color: var(--text); border-color: var(--green); }
.table-wrap {
  margin: 1.4rem 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: .7rem;
}
table { width: 100%; border-collapse: collapse; min-width: 34rem; }
th, td { padding: .72rem .8rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--text); background: #11222d; }
td { color: #c4d2d9; }
tr:last-child td { border-bottom: 0; }
.state-panel {
  position: relative;
  margin-bottom: 4rem;
  padding: clamp(1.5rem, 4vw, 2.7rem);
  overflow: hidden;
  border: 1px solid #65e0b73d;
  border-radius: 1.25rem;
  background: linear-gradient(135deg, #102631 0%, #0a1721 62%);
}
.state-panel::after {
  content: "";
  position: absolute;
  width: 18rem;
  height: 18rem;
  right: -7rem;
  top: -8rem;
  border-radius: 50%;
  background: #65e0b710;
  filter: blur(2px);
}
.section-kicker {
  color: var(--green);
  font: .75rem Consolas, monospace;
  letter-spacing: .14em;
}
.state-panel h2 { margin: .6rem 0; font-size: clamp(1.6rem, 3vw, 2.45rem); line-height: 1.2; }
.state-panel > p { color: var(--muted); }
.state-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: .65rem;
  margin-top: 1.5rem;
}
.state-item {
  display: flex;
  gap: .75rem;
  justify-content: space-between;
  align-items: center;
  padding: .8rem .9rem;
  border: 1px solid #ffffff12;
  border-radius: .6rem;
  background: #02090e4d;
}
.state-item div { display: grid; }
.state-item span { color: #7f99a5; font-size: .76rem; }
.state-item strong { color: var(--text); font-size: .9rem; }
.state-item em { color: var(--green); font-size: .72rem; font-style: normal; white-space: nowrap; }
.route-callout {
  position: relative;
  z-index: 1;
  display: grid;
  gap: .2rem;
  margin-top: 1rem;
  padding: .9rem 1rem;
  border-left: 3px solid var(--amber);
  background: #ffc9780a;
}
.route-callout strong { color: var(--amber); }
.route-callout span { color: #d1c1a7; }
.chapter-pager {
  display: flex;
  justify-content: space-between;
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}
.chapter-pager a {
  padding: .65rem .9rem;
  border: 1px solid var(--line);
  border-radius: .55rem;
  text-decoration: none;
}
.page-footer {
  margin-top: 4rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
  color: #718995;
  font-size: .82rem;
}
@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-105%);
    transition: transform .2s ease;
    box-shadow: 1rem 0 3rem #0009;
  }
  .sidebar.open { transform: translateX(0); }
  .page { margin-left: 0; }
  .menu-button { display: inline-block; }
  .topbar { padding-inline: 1rem; }
  .topbar-mode { display: none; }
}
@media (max-width: 650px) {
  .content, .home { padding: 1.4rem 1rem 3rem; }
  .state-grid { grid-template-columns: 1fr; }
  .prose h1 { font-size: 2.1rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}