:root {
  color-scheme: light;
  --paper: #f8f5ee;
  --sheet: #fffdf8;
  --ink: #26323a;
  --quiet: #57656c;
  --line: #ddd8cc;
  --accent: #194a50;
  --serif: "Songti SC", SimSun, "Noto Serif CJK SC", serif;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 1rem/1.7 system-ui, "Microsoft YaHei", sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
header { background: var(--sheet); border-bottom: 1px solid var(--line); }
header nav, main { width: min(100% - 2rem, 62rem); margin-inline: auto; }
header nav { min-height: 3.5rem; display: flex; align-items: center; justify-content: space-between; gap: .8rem; }
header nav a { display: inline-flex; align-items: center; min-height: 44px; }
.nav-actions { display: flex; align-items: center; gap: clamp(.55rem, 2vw, 1rem); font-size: .87rem; }
.workspace-link { padding-inline: .65rem; border: 1px solid var(--line); border-radius: .35rem; }
.workspace-link:hover { background: var(--paper); }
.brand { color: var(--ink); font: 700 1.45rem/1.2 Georgia, serif; }
main { padding-block: clamp(1.3rem, 5vw, 3.6rem); overflow-wrap: anywhere; }
h1, h2 { margin: .3em 0 .45em; font-family: var(--serif); line-height: 1.28; }
h1 { font-size: clamp(1.9rem, 6vw, 3.4rem); }
h2 { font-size: clamp(1.25rem, 4vw, 1.75rem); }
.eyebrow { margin: 0; color: var(--quiet); font-size: .82rem; font-weight: 700; letter-spacing: .1em; }
.shelf-intro { margin-bottom: 1.5rem; }
.shelf-intro > p:last-child { margin-block: .35rem; color: var(--quiet); }
.shelf { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 24rem), 1fr)); gap: 1rem; }
.book-card, .front, .contents, .chapter { border: 1px solid var(--line); border-radius: .85rem; background: var(--sheet); }
.book-card { display: grid; grid-template-columns: minmax(0, 7rem) minmax(0, 1fr); align-items: center; gap: 1rem; padding: 1rem; }
.front { display: grid; grid-template-columns: minmax(0, 13rem) minmax(0, 1fr); align-items: center; gap: clamp(1rem, 5vw, 3rem); padding: clamp(1rem, 4vw, 2.75rem); }
.cover { display: block; width: 100%; height: auto; aspect-ratio: 2 / 3; border-radius: .35rem; object-fit: contain; background: #1f3045; }
.title-cover { display: grid; place-content: center; gap: .35rem; padding: .45rem; text-align: center; color: #f3eadb; }
.title-cover strong { font: 700 clamp(.9rem, 2.6vw, 1.35rem)/1.55 var(--serif); }
.title-cover span { font: 600 .57rem/1.4 system-ui, sans-serif; letter-spacing: .09em; }
.intro { max-width: 42em; color: var(--quiet); }
.button { display: inline-flex; align-items: center; min-height: 44px; padding: .4rem .8rem; border-radius: .35rem; background: var(--accent); color: #fff; font-size: .9rem; }
.button:hover { text-decoration: underline; }
.button.secondary { border: 1px solid var(--line); background: var(--sheet); color: var(--accent); }
.contents { margin-top: 1rem; padding: clamp(1rem, 4vw, 2rem); }
.contents ol { list-style: none; margin: 0; padding: 0; }
.contents li + li { border-top: 1px solid var(--line); }
.contents a { display: flex; align-items: center; min-height: 44px; gap: .8rem; }
.contents a:hover { text-decoration: underline; }
.contents li span { min-width: 2ch; color: var(--quiet); font-variant-numeric: tabular-nums; }
.chapter { max-width: 45rem; margin-inline: auto; padding: clamp(1rem, 5vw, 3.5rem); }
.chapter .back { display: inline-flex; min-height: 44px; align-items: center; margin-bottom: .65rem; }
.chapter h1 { padding-bottom: 1rem; border-bottom: 1px solid var(--line); }
.prose { font: clamp(1.08rem, 2.5vw, 1.2rem)/1.95 var(--serif); }
.prose p { margin-block: 0 .85em; }
:lang(zh-CN) .prose p { text-indent: 2em; }
.page-turn { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.8rem; padding-top: 1rem; border-top: 1px solid var(--line); }

@media (max-width: 600px) {
  header nav, main { width: min(100% - 1.1rem, 36rem); }
  .book-card { grid-template-columns: minmax(0, 5.6rem) minmax(0, 1fr); }
  .front { grid-template-columns: minmax(0, 1fr); text-align: center; }
  .front .cover { width: min(100%, 11rem); margin-inline: auto; }
}