:root {
  --bg: #FAF8F3;
  --surface: #FFFFFF;
  --text: #23211C;
  --muted: #6E675C;
  --border: #E6E0D3;
  --brand: #A8863F;
  --shadow: 0 1px 2px rgba(35, 33, 28, .05), 0 6px 18px rgba(35, 33, 28, .05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1A1917;
    --brand: #C8A45C;
    --surface: #242320;
    --text: #EDEAE3;
    --muted: #9C958A;
    --border: #3A3833;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 20px 60px;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.site-header {
  max-width: 1040px;
  margin: 0 auto;
  padding: 72px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.brand-mark {
  display: block;
  width: 58px;
  height: 58px;
  margin: 0 auto 20px;
  color: var(--brand);
}

.brand-mark-sm {
  width: 34px;
  height: 34px;
  margin: 0 auto 14px;
}

.site-header h1 {
  margin: 0;
  font-size: 30px;
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.2;
}

/* 主标题整条改为矢量图：「易」转成路径（跨平台一致圆润），「」为圆角括号 */
.title-glyph {
  height: 1.2em;
  width: auto;
  vertical-align: -0.14em;
  display: inline-block;
}

.site-sub {
  margin: 6px 0 0;
  font-size: 17px;
  letter-spacing: .06em;
}

.tagline {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 14px;
}

main { max-width: 1040px; margin: 0 auto; }

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  align-items: stretch;
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 0 12px;
}

.card {
  display: flex;
  flex-direction: column;
  padding: 22px 22px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  transition: transform .18s ease, border-color .18s ease, border-width .18s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--card-accent, var(--border));
  border-width: 2px;
}

.card.feature { padding: 32px 28px 28px; }

.card-icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 11px;
  background: var(--card-tint, transparent);
  color: var(--card-accent, var(--text));
  margin-bottom: 18px;
}

.card-icon svg { width: 22px; height: 22px; }

.card h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.short-name { display: none; }

.card.feature h3 { font-size: 20px; }

.card .sub {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--card-accent, var(--muted));
}

.card .desc {
  margin: 14px 0 0;
  font-size: 14px;
  color: var(--muted);
  flex: 1;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.tags li {
  font-size: 12px;
  line-height: 1.6;
  padding: 2px 9px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
}

.card .go {
  margin: 20px 0 0;
  font-size: 14px;
  color: var(--card-accent, var(--text));
}

.about {
  margin-top: 40px;
  padding-top: 36px;
  border-top: 1px solid var(--border);
  max-width: 1040px;
  margin-left: auto;
  margin-right: auto;
}

.about > * { max-width: 720px; }

.about h2 {
  margin: 0 0 14px;
  font-size: 16px;
  font-weight: 600;
}

.about p { margin: 0 0 12px; color: var(--muted); }

.about .contact { margin-top: 18px; font-size: 14px; }

.books-link { margin: 10px 0 0; font-size: 14px; }
.books-link a { color: #A8751C; text-decoration: none; }
.books-link a:hover { text-decoration: underline; }

footer {
  max-width: 1040px;
  margin: 56px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

footer p { margin: 0 0 6px; }
footer .copy { opacity: .75; }

.back-link {
  margin: 12px 0 0;
  font-size: 13px;
}

.back-link a, footer a { color: var(--muted); }
.back-link a:hover, footer a:hover { color: var(--text); }

.books-head { padding: 36px 0 0; }

.books-head h2 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
}

.books-intro {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 14px;
}

.books-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.books-toolbar input[type="search"] {
  flex: 1 1 200px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
}

.books-toolbar input[type="search"]:focus {
  outline: none;
  border-color: #A8751C;
}

.chk {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
}

.count {
  margin-left: auto;
  font-size: 13px;
  color: var(--muted);
}

.year-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 32px;
}

.year-nav a {
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
}

.year-nav a:hover { border-color: #A8751C; color: var(--text); }

.book-year { scroll-margin-top: 16px; margin-bottom: 30px; }

.book-year h3 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 600;
}

.book-year h3 span { font-size: 12px; font-weight: 400; color: var(--muted); }

.books { list-style: none; margin: 0; padding: 0; }

.book {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding: 5px 0 5px 12px;
  border-left: 2px solid transparent;
  font-size: 14px;
}

.book.note { border-left-color: #B8862F; }

.bt { color: var(--text); }
.br { font-size: 13px; color: var(--muted); }

.bstate {
  padding: 1px 7px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 11px;
  color: var(--muted);
}

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

@media (max-width: 860px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    max-width: 420px;
    margin: 0 auto;
    padding: 32px 0 8px;
  }
  .card {
    padding: 16px 12px;
    align-items: center;
    text-align: center;
  }
  .card-icon { width: 34px; height: 34px; margin-bottom: 8px; }
  .card-icon svg { width: 18px; height: 18px; }
  .card h3 { font-size: 16px; }
  .card .sub, .card .desc, .tags, .card .go { display: none; }
  .full-name { display: none; }
  .short-name { display: inline; font-size: 15px; }
  .site-header { padding: 48px 0 32px; }
}