:root {
  --page-bg: #071327;
  --panel-bg: #0f2235;
  --text: #f6edcf;
  --muted: #d6c28f;
  --link: #ffd56b;
  --border: #876f36;
  --accent: #d9ae4c;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  color: var(--text);
  background: radial-gradient(circle at top, #173451 0, var(--page-bg) 55%);
  line-height: 1.65;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
.header {
  border-bottom: 1px solid var(--border);
  background: rgba(7,19,32,.96);
  padding: 18px 22px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.header h1 { margin: 0; font-size: 1.65rem; letter-spacing: .04em; }
.header .sub { color: var(--muted); font-size: .95rem; margin-top: 4px; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 28px 20px 60px; }
.card {
  border: 1px solid var(--border);
  background: rgba(15,34,53,.92);
  box-shadow: 0 10px 30px rgba(0,0,0,.28);
  padding: 26px;
  border-radius: 10px;
}
.book-grid {
  columns: 2 300px;
  column-gap: 40px;
}
.book-grid li { break-inside: avoid; margin: .25rem 0 .4rem; }
h1.book-title {
  color: #fff7dc;
  text-align: center;
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.15;
  margin: 8px 0 24px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 18px;
}
h2 {
  color: var(--accent);
  text-align: center;
  font-size: 1.65rem;
  margin: 2.2rem 0 1rem;
}
p { font-size: 1.11rem; margin: 0 0 1rem; }
.navbar {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 18px 0 28px;
  color: var(--muted);
}
.navbar a, .button {
  border: 1px solid var(--border);
  background: rgba(0,0,0,.18);
  padding: 7px 11px;
  border-radius: 7px;
}
.footer {
  max-width: 1040px;
  margin: 28px auto;
  padding: 0 20px 30px;
  color: var(--muted);
  text-align: center;
  font-size: .9rem;
}
.two-col-layout { display: grid; grid-template-columns: 290px 1fr; min-height: 100vh; }
.sidebar {
  background: rgba(7,19,32,.98);
  border-right: 1px solid var(--border);
  padding: 18px;
  overflow-y: auto;
  max-height: 100vh;
  position: sticky;
  top: 0;
}
.sidebar h2 { text-align: left; font-size: 1.15rem; margin-top: 0; }
.sidebar ol { padding-left: 1.2rem; }
.sidebar li { margin: .35rem 0; line-height: 1.3; }
.content-frame { width: 100%; min-height: 100vh; border: 0; background: var(--page-bg); }
@media (max-width: 800px) {
  .two-col-layout { display: block; }
  .sidebar { position: relative; max-height: none; border-right: 0; border-bottom: 1px solid var(--border); }
  p { font-size: 1.03rem; }
  .card { padding: 18px; }
}
@media print {
  body { background: #fff; color: #000; }
  .header, .navbar, .footer { display: none; }
  .card { border: 0; box-shadow: none; padding: 0; }
  a { color: #000; }
}