:root {
    --paper: #f5f3ed;
    --ink: #20231f;
    --muted: #687067;
    --line: #d9d8cf;
    --surface: #fffefa;
    --forest: #234d3c;
    --coral: #c85c3f;
    --gold: #b8872f;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.85;
}
a { color: var(--forest); }
.site-nav {
    position: sticky;
    top: 0;
    z-index: 10;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 254, 250, .96);
}
.nav-inner {
    max-width: 1080px;
    min-height: 52px;
    margin: 0 auto;
    padding: 8px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--muted);
    font-size: 14px;
}
.nav-inner a { color: var(--forest); text-decoration: none; }
.hero {
    border-bottom: 1px solid var(--line);
    background: var(--surface);
}
.hero-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 64px 20px 56px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(230px, 320px);
    gap: 56px;
    align-items: end;
}
.eyebrow {
    margin: 0 0 12px;
    color: var(--coral);
    font-size: 13px;
    font-weight: 700;
}
h1 {
    max-width: 780px;
    margin: 0;
    font-family: Georgia, "Songti SC", "STSong", serif;
    font-size: 48px;
    line-height: 1.18;
    font-weight: 700;
}
.lede {
    max-width: 760px;
    margin: 20px 0 0;
    color: #4c514b;
    font-size: 19px;
}
.book-facts {
    margin: 0;
    padding: 18px 0 0;
    border-top: 3px solid var(--forest);
    display: grid;
    gap: 10px;
}
.book-facts div { display: grid; grid-template-columns: 72px 1fr; gap: 12px; }
.book-facts dt { color: var(--muted); font-size: 13px; }
.book-facts dd { margin: 0; font-weight: 600; }
.layout {
    max-width: 1080px;
    margin: 0 auto;
    padding: 44px 20px 72px;
    display: grid;
    grid-template-columns: 190px minmax(0, 720px);
    gap: 56px;
}
.toc { align-self: start; position: sticky; top: 82px; }
.toc strong { display: block; margin-bottom: 10px; font-size: 13px; color: var(--muted); }
.toc a { display: block; padding: 5px 0; text-decoration: none; font-size: 14px; }
.article section { margin-bottom: 38px; }
h2 {
    margin: 0 0 14px;
    font-family: Georgia, "Songti SC", "STSong", serif;
    font-size: 28px;
    line-height: 1.35;
}
h3 { margin: 24px 0 7px; font-size: 18px; }
p { margin: 0 0 14px; }
ul { margin: 0; padding-left: 22px; }
li { margin-bottom: 8px; }
.summary {
    padding: 22px 24px;
    border-left: 4px solid var(--coral);
    background: var(--surface);
}
.summary p:last-child { margin-bottom: 0; }
.quote {
    margin: 24px 0;
    padding: 0 0 0 22px;
    border-left: 2px solid var(--gold);
    color: #4c514b;
    font-family: Georgia, "Songti SC", "STSong", serif;
    font-size: 20px;
}
.related {
    padding-top: 28px;
    border-top: 1px solid var(--line);
}
.related-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.related-links a { font-size: 14px; }
.catalog {
    max-width: 1080px;
    margin: 0 auto;
    padding: 54px 20px 72px;
}
.catalog-intro { max-width: 760px; color: var(--muted); font-size: 17px; }
.book-grid {
    margin-top: 36px;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}
.book-card {
    min-height: 245px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--line);
    border-top: 4px solid var(--forest);
    background: var(--surface);
    color: inherit;
    text-decoration: none;
}
.book-card:nth-child(3n+2) { border-top-color: var(--coral); }
.book-card:nth-child(3n) { border-top-color: var(--gold); }
.book-card:hover { transform: translateY(-2px); border-color: #a8aaa2; }
.book-card .kind { color: var(--muted); font-size: 12px; }
.book-card h2 { margin: 14px 0 8px; font-size: 25px; }
.book-card p { color: #555b54; font-size: 14px; line-height: 1.7; }
.book-card .author { margin-top: auto; color: var(--forest); font-size: 13px; font-weight: 700; }
footer {
    border-top: 1px solid var(--line);
    padding: 24px 20px 36px;
    text-align: center;
    color: var(--muted);
    font-size: 13px;
}
footer a { text-decoration: none; }

@media (max-width: 760px) {
    .hero-inner { grid-template-columns: 1fr; gap: 30px; padding-top: 44px; }
    h1 { font-size: 38px; }
    .layout { grid-template-columns: 1fr; gap: 20px; padding-top: 32px; }
    .toc { position: static; display: flex; flex-wrap: wrap; gap: 2px 16px; }
    .toc strong { width: 100%; }
    .book-grid { grid-template-columns: 1fr; }
    .book-card { min-height: 0; }
}