:root {
  --sand: #f6f2ec;
  --card: #fffdf9;
  --ink: #23201b;
  --muted: #6f6a5e;
  --line: #e7e0d3;
  --accent: #7c5a2e;
  --accent-soft: #f0e7d8;
  --ok: #2e7d4f;
  --warn-bg: #fdf1e3;
  --warn-line: #ecd9b8;
  --note-bg: #eef3f6;
  --note-line: #d5e2e8;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--sand);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}
.page {
  max-width: 1040px;
  margin: 0 auto;
  background: var(--card);
  min-height: 100vh;
  padding: 0 20px 48px;
}
.file-nav {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
  margin-bottom: 24px;
  position: sticky;
  top: 0;
  background: var(--card);
  z-index: 5;
}
.file-nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 15px;
}
.file-nav a.active { color: var(--ink); font-weight: 600; background: var(--accent-soft); }
h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 34px;
  font-weight: 600;
  margin: 8px 0 4px;
}
h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 22px;
  font-weight: 600;
  margin: 4px 0 8px;
}
.fact-line { color: var(--accent); font-weight: 600; font-size: 15px; margin: 0 0 8px; }
.intro { color: var(--muted); margin: 0 0 24px; }
.group { border-top: 1px solid var(--line); padding: 20px 0; }
.group-label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 6px;
}
.hero-img { width: 100%; border-radius: 14px; display: block; }
.caption { color: var(--muted); font-size: 13px; margin: 6px 0 0; }
ol.numbered, ul.bullets { margin: 8px 0; padding-left: 22px; }
ol.numbered li, ul.bullets li { margin: 6px 0; }
.rows { display: flex; flex-direction: column; gap: 10px; margin: 8px 0; }
.row {
  display: flex; justify-content: space-between; gap: 12px;
  border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px;
}
.row .name { font-weight: 600; }
.row .detail { color: var(--muted); font-size: 14px; }
.row .value { font-weight: 600; white-space: nowrap; }
.callout {
  border-radius: 12px; padding: 14px 16px; margin: 14px 0; font-size: 15px;
}
.callout .callout-title { font-weight: 700; margin-bottom: 4px; }
.callout.warning { background: var(--warn-bg); border: 1px solid var(--warn-line); }
.callout.note { background: var(--note-bg); border: 1px solid var(--note-line); }
.file-button {
  display: inline-block;
  border-radius: 999px;
  padding: 10px 18px;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid var(--accent);
  margin: 4px 8px 4px 0;
  background: #fff;
  color: var(--accent);
}
.file-button.primary { background: var(--accent); color: #fff; }
.file-button.ghost { border-color: transparent; color: var(--accent); }
.file-button.compact { padding: 6px 14px; font-size: 14px; }
.file-button:disabled { opacity: 0.45; cursor: default; }
a.file-button { text-decoration: none; }
.day-grid { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.day-chip {
  width: 40px; height: 40px; border-radius: 999px;
  border: 1px solid var(--line); background: #fff; color: var(--muted);
  cursor: pointer; font-size: 14px;
}
.day-chip.is-open { border-color: var(--accent); color: var(--accent); font-weight: 700; }
.day-chip.is-done { background: var(--ok); border-color: var(--ok); color: #fff; }
.day-chip:disabled { opacity: 0.5; cursor: default; }
.quiz-q { margin: 14px 0; }
.quiz-choices { display: flex; flex-wrap: wrap; gap: 4px; }
.facts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 8px 0; }
.fact {
  border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px;
}
.fact .k { font-size: 13px; color: var(--muted); }
.fact .v { font-weight: 700; }
.key-sentence { font-size: 19px; font-family: Georgia, serif; margin: 10px 0; }
.slider-row { margin: 10px 0; }
.slider-row input[type="range"] { width: 100%; }
.choice-row { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.choice-row button {
  border: 1px solid var(--line); background: #fff; border-radius: 999px;
  padding: 7px 14px; cursor: pointer; font-size: 14px;
}
.choice-row button.selected { border-color: var(--accent); background: var(--accent-soft); font-weight: 600; }
svg.chart { width: 100%; height: auto; display: block; margin: 10px 0; }
.closing {
  border-top: 1px solid var(--line);
  color: var(--muted); font-size: 13px;
  padding: 16px 0 0;
}
@media (min-width: 768px) {
  .page { padding: 0 40px 64px; }
  h1 { font-size: 42px; }
}