/* 道德经 · 王弼本白话译注 */
:root {
  --paper: #f4efe4;
  --card: #fbf8f1;
  --ink: #2b2620;
  --ink-soft: #4a433a;
  --muted: #7a7064;
  --rule: #dcd2c0;
  --accent: #9b2c22;
  --accent-soft: #f1ddd4;
  --accent-fill: #9b2c22;
  --mark: #e9dcb9;
  --fs: 18px;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Source Han Serif", "Songti SC", "STSong", "SimSun", serif;
  --kai: "Kaiti SC", "STKaiti", "KaiTi", "Noto Serif SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #161412; --card: #1f1c19; --ink: #e9e2d5; --ink-soft: #cfc6b6; --muted: #9d9384;
    --rule: #39332c; --accent: #e07a62; --accent-soft: #3a231d; --accent-fill: #8f3426; --mark: #4a3f26;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #161412; --card: #1f1c19; --ink: #e9e2d5; --ink-soft: #cfc6b6; --muted: #9d9384;
  --rule: #39332c; --accent: #e07a62; --accent-soft: #3a231d; --accent-fill: #8f3426; --mark: #4a3f26;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--serif); font-size: var(--fs); line-height: 1.85;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }

/* 顶栏 */
.bar {
  position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule); font-family: var(--sans); font-size: 14px;
}
.bar .wrap { display: flex; align-items: center; gap: 8px; height: 48px; }
.bar .home { color: var(--ink); font-weight: 600; white-space: nowrap; }
.bar .crumb { color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bar .sp { flex: 1; }
.btn {
  font: inherit; font-size: 13px; color: var(--ink-soft); background: transparent;
  border: 1px solid var(--rule); border-radius: 6px; padding: 4px 9px; cursor: pointer; line-height: 1.4; white-space: nowrap;
}
.btn:hover { border-color: var(--muted); }
.btn.on { background: var(--accent-fill); border-color: var(--accent-fill); color: #fff; }

/* 章节页 */
.head { padding: 40px 0 8px; }
.kicker { font-family: var(--sans); font-size: 13px; letter-spacing: .15em; color: var(--muted); }
.head h1 { margin: 6px 0 0; font-size: 2em; font-weight: 700; letter-spacing: .06em; }
.head h1 small { font-size: .55em; color: var(--muted); font-weight: 400; margin-left: .6em; letter-spacing: .1em; }
.yuanwen {
  margin: 28px 0 8px; padding: 24px 0 24px 22px; border-left: 3px solid var(--accent);
  font-family: var(--kai); font-size: 1.35em; line-height: 2.05; letter-spacing: .04em;
}
.yuanwen p { margin: 0; }
section { margin: 40px 0; }
h2 {
  font-family: var(--sans); font-size: 14px; font-weight: 600; letter-spacing: .2em; color: var(--accent);
  margin: 0 0 14px; display: flex; align-items: center; gap: 10px;
}
h2::after { content: ""; flex: 1; height: 1px; background: var(--rule); }
.tr p { margin: 0 0 .9em; text-indent: 2em; }
dl.notes { margin: 0; display: grid; grid-template-columns: max-content 1fr; gap: 10px 18px; }
dl.notes dt { font-weight: 700; color: var(--ink); }
dl.notes dd { margin: 0; color: var(--ink-soft); }
@media (max-width: 560px) {
  dl.notes { grid-template-columns: 1fr; gap: 2px; }
  dl.notes dd { margin-bottom: 10px; }
}
.cards { display: grid; gap: 14px; }
.card { background: var(--card); border: 1px solid var(--rule); border-radius: 10px; padding: 16px 18px; }
.card h3 { margin: 0 0 6px; font-family: var(--sans); font-size: 15px; font-weight: 600; }
.card h3 span { font-weight: 400; color: var(--muted); font-size: 13px; margin-left: 6px; }
.card p { margin: 0; color: var(--ink-soft); }
details { margin-top: 10px; }
details summary { cursor: pointer; font-family: var(--sans); font-size: 13px; color: var(--muted); }
details .raw { margin-top: 8px; font-family: var(--kai); font-size: .95em; line-height: 1.95; color: var(--ink-soft); }
.empty { color: var(--muted); font-style: italic; }
.var, .fix { background: var(--accent-soft); border-radius: 10px; padding: 14px 18px; color: var(--ink-soft); }
.fix ul { margin: 6px 0 0; padding-left: 1.2em; }
.fix li { margin: 4px 0; }
.fix del { color: var(--muted); }
.fix ins { text-decoration: none; font-weight: 700; color: var(--ink); }
.debate { display: grid; gap: 12px; }
.debate div { border-left: 2px solid var(--rule); padding-left: 14px; }
.debate b { display: block; font-family: var(--sans); font-size: 14px; }
.debate p { margin: 2px 0 0; color: var(--ink-soft); }
ol.qs { margin: 0; padding-left: 1.4em; }
ol.qs li { margin: 6px 0; }
textarea {
  width: 100%; min-height: 140px; resize: vertical; margin-top: 12px;
  font: inherit; font-size: .92em; line-height: 1.7; color: var(--ink);
  background: var(--card); border: 1px solid var(--rule); border-radius: 10px; padding: 12px 14px;
}
textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.noteinfo { font-family: var(--sans); font-size: 12px; color: var(--muted); margin-top: 6px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-family: var(--sans); font-size: 13px; border: 1px solid var(--rule); border-radius: 99px; padding: 2px 12px; color: var(--ink-soft); }
.chip:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 48px 0 24px; font-family: var(--sans); }
.pager a { border: 1px solid var(--rule); border-radius: 10px; padding: 12px 14px; color: var(--ink); background: var(--card); }
.pager a:hover { border-color: var(--accent); text-decoration: none; }
.pager small { display: block; color: var(--muted); font-size: 12px; }
.pager .next { text-align: right; grid-column: 2; }
.donebar { display: flex; justify-content: center; margin: 32px 0 0; }
.donebar .btn { font-size: 15px; padding: 8px 20px; }
footer { border-top: 1px solid var(--rule); margin-top: 48px; padding: 20px 0 40px; font-family: var(--sans); font-size: 12px; color: var(--muted); }

/* 首页 */
.hero { padding: 48px 0 12px; }
.hero h1 { font-size: 2.4em; margin: 0; letter-spacing: .12em; }
.hero p { color: var(--ink-soft); margin: 8px 0 0; }
.prog { margin: 24px 0 8px; font-family: var(--sans); font-size: 14px; color: var(--muted); }
.prog .track { height: 6px; background: var(--rule); border-radius: 99px; margin-top: 8px; overflow: hidden; }
.prog .fill { height: 100%; width: 0; background: var(--accent); border-radius: 99px; transition: width .4s; }
.today { display: block; margin: 20px 0; padding: 18px 20px; border-radius: 12px; background: var(--accent-fill); color: #fff; }
.today:hover { text-decoration: none; filter: brightness(1.05); }
.today small { display: block; opacity: .85; font-family: var(--sans); font-size: 13px; letter-spacing: .1em; }
.today b { font-size: 1.3em; }
.search {
  width: 100%; font: inherit; font-size: 16px; padding: 10px 14px; border-radius: 10px;
  border: 1px solid var(--rule); background: var(--card); color: var(--ink); margin: 8px 0 4px;
}
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px; }
.cell { display: block; background: var(--card); border: 1px solid var(--rule); border-radius: 10px; padding: 10px 12px; color: var(--ink); position: relative; }
.cell:hover { border-color: var(--accent); text-decoration: none; }
.cell .no { font-family: var(--sans); font-size: 12px; color: var(--muted); }
.cell .th { display: block; font-weight: 700; }
.cell .fl { display: block; font-size: 13px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-family: var(--kai); }
.cell.read::after { content: "已读"; position: absolute; top: 8px; right: 10px; font-family: var(--sans); font-size: 11px; color: var(--accent); }
.cell.hasnote .no::after { content: " · 有笔记"; color: var(--accent); }
.cell[hidden] { display: none; }
.links { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0; font-family: var(--sans); font-size: 14px; }

/* 字词索引 */
.word { scroll-margin-top: 64px; }
.word h3 { margin: 0 0 4px; font-size: 1.4em; }
.word h3 small { font-family: var(--sans); font-size: 13px; color: var(--muted); font-weight: 400; margin-left: 8px; }
.word ul { margin: 6px 0 0; padding: 0; list-style: none; }
.word li { padding: 4px 0; border-bottom: 1px dashed var(--rule); font-size: .92em; }
.word li a { font-family: var(--sans); font-size: 13px; margin-right: 10px; white-space: nowrap; }
mark { background: var(--mark); color: inherit; padding: 0 1px; border-radius: 2px; }
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 32px; }

/* 说明页 */
.prose p, .prose li { color: var(--ink-soft); }
table.fixes { width: 100%; border-collapse: collapse; font-size: .9em; }
table.fixes th, table.fixes td { border-bottom: 1px solid var(--rule); padding: 8px 6px; text-align: left; vertical-align: top; }
table.fixes th { font-family: var(--sans); font-size: 13px; color: var(--muted); font-weight: 600; }
.tablewrap { overflow-x: auto; }