:root {
  --bg: #090909;
  --bg-2: #101010;
  --ink: #f4f1ea;
  --muted: #a7a39a;
  --faint: #6f6c66;
  --line: #242424;
  --line-strong: #3a3428;
  --gold: #c6a15a;
  --gold-dim: rgba(198, 161, 90, 0.16);
  --sidebar: #050505;
  --card: #111111;
  --danger: #e8e4dc;
  --shadow: 0 0 0 1px var(--line);
  --serif: "Iowan Old Style", Palatino, "Palatino Linotype", Georgia, serif;
  --sans: "Segoe UI", system-ui, sans-serif;
  --mono: "Cascadia Mono", "Segoe UI Mono", ui-monospace, monospace;
  --side: 272px;
  --measure: 720px;
}

html[data-theme="light"] {
  --bg: #f7f5f1;
  --bg-2: #fffdf9;
  --ink: #141414;
  --muted: #5e5a54;
  --faint: #8a857c;
  --line: #e6e1d8;
  --line-strong: #d9c9a4;
  --gold: #8d6b2f;
  --gold-dim: rgba(141, 107, 47, 0.1);
  --sidebar: #111111;
  --card: #ffffff;
  --danger: #1a1a1a;
  --shadow: 0 0 0 1px var(--line);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
}
a { color: inherit; }
button, input { font: inherit; color: inherit; }

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--side);
  background: var(--sidebar);
  color: #f4f1ea;
  border-right: 1px solid #2a2418;
  display: flex;
  flex-direction: column;
  z-index: 20;
}
.brand {
  padding: 28px 22px 18px;
  border-bottom: 1px solid #241f16;
}
.brand .mark {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--gold);
  margin: 0 0 8px;
}
.brand strong {
  display: block;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 22px;
  letter-spacing: -0.02em;
}
.brand span {
  display: block;
  margin-top: 4px;
  color: #9a958b;
  font-size: 13px;
}
.search {
  margin: 16px 16px 8px;
  position: relative;
}
.search input {
  width: 100%;
  background: #141414;
  border: 1px solid #2c2c2c;
  border-radius: 999px;
  padding: 9px 14px 9px 34px;
  outline: none;
}
.search input:focus { border-color: var(--gold); }
.search .lens {
  position: absolute;
  left: 13px;
  top: 10px;
  color: var(--gold);
  font-size: 13px;
}
.nav {
  overflow: auto;
  padding: 8px 10px 16px;
  flex: 1;
}
.nav a {
  display: flex;
  gap: 10px;
  align-items: baseline;
  text-decoration: none;
  color: #c8c4bb;
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 14px;
}
.nav a:hover { background: #161616; color: #fff; }
.nav a.active { color: #fff; background: var(--gold-dim); }
.nav a i {
  font-style: normal;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--gold);
  width: 22px;
  flex: none;
}
.nav-label {
  margin: 18px 12px 4px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: #8d7340;
}
.chapter { scroll-margin-top: 28px; }
.rule {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 8px 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}
.rule b { font-weight: 600; }
.rule .n {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--gold);
  padding-top: 3px;
}
.pen {
  display: block;
  margin-top: 4px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--gold);
}
.side-foot {
  padding: 14px 18px 18px;
  border-top: 1px solid #241f16;
}
.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #9a958b;
  margin-bottom: 8px;
}
.bar {
  height: 2px;
  background: #2a2a2a;
}
.bar span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--gold);
}
.side-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.side-actions button {
  flex: 1;
  background: transparent;
  border: 1px solid #333;
  color: #d9d4ca;
  border-radius: 999px;
  padding: 7px 8px;
  cursor: pointer;
  font-size: 12px;
}
.side-actions button:hover { border-color: var(--gold); color: #fff; }

.layout {
  margin-left: var(--side);
  min-height: 100vh;
}
.page {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 56px 28px 96px;
}
.hero {
  padding-bottom: 28px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 14px;
}
h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin: 0 0 16px;
}
.lede {
  color: var(--muted);
  font-size: 18px;
  max-width: 38em;
  margin: 0;
}
.chapter {
  display: none;
  padding: 8px 0 8px;
  border-bottom: none;
}
.chapter.on { display: block; }
.hero { display: none; }
.hero.on { display: block; }
.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 28px;
}
.pager a {
  text-decoration: none;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 14px;
}
.pager a:hover { border-color: var(--gold); }
.pager a[hidden] { display: none; }
.chapter h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 34px;
  letter-spacing: -0.03em;
  margin: 0 0 8px;
  display: flex;
  gap: 14px;
  align-items: baseline;
}
.chapter h2 em {
  font-style: normal;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--gold);
  letter-spacing: 0.14em;
}
h3 {
  font-size: 15px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 600;
  margin: 28px 0 10px;
}
p { margin: 0 0 12px; }
ul, ol { margin: 0 0 14px; padding-left: 1.15em; }
li { margin: 5px 0; }
li::marker { color: var(--gold); }
.muted { color: var(--muted); }
.note, .call {
  border-left: 2px solid var(--gold);
  background: var(--gold-dim);
  padding: 12px 16px;
  margin: 16px 0;
}
.call strong { font-weight: 650; }
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 14px 0 8px;
}
.card, .unit, .q, .place {
  background: var(--card);
  box-shadow: var(--shadow);
  border-radius: 12px;
  padding: 14px 16px;
}
.unit h4, .place h4, .q h4 {
  margin: 0 0 6px;
  font-size: 16px;
}
.unit p, .place p, .q p { margin: 0; color: var(--muted); font-size: 14.5px; }
.tag {
  display: inline-block;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  margin: 8px 0 16px;
}
th, td {
  text-align: left;
  padding: 9px 8px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
  font-weight: 600;
}
td.num {
  font-family: var(--mono);
  color: var(--gold);
  width: 42px;
}
.scroll { overflow-x: auto; }
.done {
  display: flex;
  gap: 10px;
  align-items: center;
  margin: 22px 0 8px;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  user-select: none;
}
.done input { accent-color: var(--gold); width: 16px; height: 16px; }
.steps { padding-left: 0; list-style: none; counter-reset: step; }
.steps > li {
  counter-increment: step;
  position: relative;
  padding: 0 0 14px 42px;
  margin: 0;
}
.steps > li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--gold);
}
.reveal, .menu-btn {
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 7px 14px;
  cursor: pointer;
}
.reveal:hover, .menu-btn:hover { border-color: var(--gold); }
.answer { margin-top: 10px; color: var(--ink); }
.q + .q { margin-top: 10px; }
.menu-btn {
  display: none;
  position: fixed;
  top: 14px;
  right: 14px;
  z-index: 30;
  background: var(--sidebar);
  color: #f4f1ea;
}
.empty {
  display: none;
  color: var(--muted);
  padding: 28px 0;
}
.footer {
  margin-top: 36px;
  color: var(--faint);
  font-size: 13px;
}
.footer a { color: var(--gold); }

@media (max-width: 860px) {
  .sidebar {
    transform: translateX(-105%);
    transition: transform 0.2s ease;
  }
  .sidebar.open { transform: none; }
  .layout { margin-left: 0; }
  .page { padding: 72px 18px 72px; }
  .grid { grid-template-columns: 1fr; }
  .menu-btn { display: block; }
  h1 { font-size: 40px; }
}

@media print {
  .sidebar, .menu-btn, .done, .side-foot, .search { display: none !important; }
  .layout { margin: 0; }
  body { background: white; color: black; }
  .chapter { break-inside: avoid; }
}