:root {
  --paper: #f7f4ee;
  --ink: #1e2433;
  --gold: #c99a3e;
  --muted: #5b6275;
  --line: #e3ded3;
  --serif: "Songti SC", "STSong", "SimSun", "PMingLiU", "Noto Serif SC", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --page: 1120px;
  --mast: 108px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
}

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 12px;
}

.skip:focus { top: 8px; }

.mast {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--paper);
  border-bottom: 1px solid var(--gold);
}

.mast-inner,
main {
  width: min(var(--page), calc(100% - 32px));
  margin: 0 auto;
}

.mast-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  min-height: 64px;
  padding: 12px 0;
}

.eyebrow, .mast-name { margin: 0; }

.mast-name {
  font-family: var(--serif);
  font-size: 22px;
  letter-spacing: 0.04em;
}

.mast-nav { margin-left: auto; display: flex; flex-wrap: wrap; gap: 8px 14px; }

.mast-nav a, .text-link {
  color: var(--ink);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.standing {
  margin: 18px 0 8px;
  padding: 12px 14px;
  background: #fff;
  border-left: 3px solid var(--gold);
}

.status { color: var(--muted); }

.chooser {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 8px;
  margin: 12px 0 18px;
}

.civ-btn {
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.civ-btn[aria-pressed="true"] { border-color: var(--gold); box-shadow: inset 3px 0 0 var(--gold); }

.civ-btn:disabled { opacity: 0.62; cursor: default; }

.civ-btn small, .meta, .branch-name { color: var(--muted); }

.branch-name {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0;
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.03em;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(32px, 5vw, 48px);
  color: var(--ink);
  border-bottom: 2px solid var(--gold);
  display: inline-block;
}

h1:focus { outline: 2px solid var(--ink); outline-offset: 4px; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 480px);
  gap: 28px;
  align-items: start;
  margin-bottom: 8px;
}

.turns { margin: 8px 0 0; padding-left: 1.2em; }

.turns li { margin: 2px 0; }

.cover {
  display: block;
  width: 100%;
  max-height: 320px;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  margin: 0;
  background: #fff;
}

.modes { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }

.modes button, .open-diagram {
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.modes button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }

.frame {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
}

.timeline { list-style: none; margin: 0 0 18px; padding: 0 0 0 18px; border-left: 1px solid var(--gold); }

.timeline li { position: relative; margin: 0 0 18px; }

.timeline li::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 6px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--gold);
  background: var(--paper);
}

.when {
  margin: 0;
  color: #9a6b1c;
  font-size: 13px;
  font-weight: 600;
}

.chapter-name {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
}

.event-label { margin: 8px 0 0; font-weight: 600; }

.book-title { margin: 18px 0 8px; font-size: 20px; }

.consequence { margin: 2px 0 6px; color: var(--muted); font-size: 15px; }

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  margin-left: 8px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.thumbs { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0; }

.thumbs img { width: 120px; height: 80px; object-fit: cover; background: #fff; }

.source { margin: 4px 0; font-size: 12px; color: var(--muted); }

.source summary { min-height: 44px; padding: 8px 0; cursor: pointer; }

.read-map {
  max-width: 760px;
  margin: 8px auto 28px;
  padding-left: 8px;
}

.read-lane {
  list-style: none;
  counter-reset: read;
  margin: 0 0 22px;
  padding: 0 0 0 28px;
  border-left: 1px solid var(--gold);
}

.read-lane li {
  position: relative;
  margin: 0 0 14px;
  padding: 12px 14px 14px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  overflow-wrap: anywhere;
}

.read-lane li::before {
  content: counter(read);
  counter-increment: read;
  position: absolute;
  left: -28px;
  top: 16px;
  transform: translateX(-50%);
  width: 22px;
  height: 22px;
  border: 1px solid var(--gold);
  border-radius: 50%;
  background: var(--paper);
  color: var(--ink);
  font-size: 12px;
  line-height: 20px;
  text-align: center;
}

.read-name {
  margin: 0;
  color: var(--ink);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
}

.read-time {
  margin-top: 6px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  white-space: normal;
}

.read-summary { font-size: 15px; line-height: 1.6; }

.advanced-diagram { margin: 8px 0 24px; }

.advanced-diagram > summary {
  min-height: 44px;
  padding: 8px 0;
  cursor: pointer;
  font-weight: 600;
}

.node-index { margin: 0 0 18px; }

.node-index > summary {
  display: flex;
  align-items: center;
  min-height: 44px;
  cursor: pointer;
  font-weight: 600;
}

.node-card {
  margin: 0 0 12px;
  padding: 10px 12px;
  background: #fff;
  border-left: 3px solid var(--gold);
}

.node-card h3 { margin: 0; font-size: 18px; }

.node-card:focus { outline: 2px solid var(--ink); outline-offset: 2px; }

.retry {
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.facts,
.facts li {
  min-width: 0;
  overflow-wrap: anywhere;
}

.facts { padding-left: 1.1em; }

@media (max-width: 800px) {
  .hero { grid-template-columns: 1fr; }
  .cover { max-width: 480px; }
}

@media (max-width: 720px) {
  .mast-nav { margin-left: 0; }
}

@media (max-width: 600px) {
  .chooser {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }

  .civ-btn {
    min-height: 40px;
    height: auto;
    padding: 6px 8px;
    font-size: 13px;
    line-height: 1.3;
    text-align: center;
    white-space: normal;
  }

  .civ-btn[aria-pressed="true"] {
    background: var(--gold);
    color: var(--ink);
    box-shadow: none;
  }
}