/* 大思考精读库 — 书斋设计系统 */
:root {
  --paper: #F7F6F2;
  --paper-deep: #EFEEE7;
  --ink: #21313A;
  --ink-soft: #5C6B74;
  --ink-faint: #8A949B;
  --hairline: #E1DED3;
  --indigo: #3A6285;
  --indigo-deep: #2C4E6B;
  --seal: #B23B2E;
  --cat-philosophy: #3E5F7E;
  --cat-science: #37775F;
  --cat-mind: #7A5B84;
  --cat-business: #A5762B;
  --cat-history: #9C4F3D;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

* { 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: 17px;
  line-height: 1.9;
}
a { color: var(--indigo); text-decoration: none; }
a:hover { color: var(--indigo-deep); text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--seal); outline-offset: 2px; border-radius: 2px; }
::selection { background: #E8D8C8; }

/* ---------- 页首 ---------- */
.site-header {
  max-width: 1120px;
  margin: 0 auto;
  padding: 26px 28px 0;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 13px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.seal {
  width: 44px; height: 44px;
  background: var(--seal);
  color: #F7F6F2;
  font-weight: 700;
  font-size: 24px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 3px;
  box-shadow: inset 0 0 0 2px rgba(247,246,242,.35), inset 0 0 0 4px var(--seal);
  flex: none;
}
.brand-name { font-size: 19px; font-weight: 700; letter-spacing: .04em; line-height: 1.3; }
.brand-sub { font-family: var(--sans); font-size: 12px; color: var(--ink-faint); letter-spacing: .02em; }
.site-nav {
  margin-left: auto;
  display: flex; align-items: center; gap: 4px;
  font-family: var(--sans); font-size: 14px; flex-wrap: wrap;
}
.site-nav a { color: var(--ink-soft); padding: 6px 9px; border-radius: 4px; }
.site-nav a:hover { color: var(--ink); background: var(--paper-deep); text-decoration: none; }
.site-nav .nav-search { color: var(--seal); }

/* ---------- 首页 ---------- */
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }
.narrow { max-width: 780px; }

.hero { padding: 84px 0 64px; }
.hero h1 {
  font-size: clamp(40px, 6.4vw, 68px);
  font-weight: 900;
  letter-spacing: .02em;
  line-height: 1.22;
  margin: 0 0 22px;
}
.hero .hero-line {
  font-size: 20px;
  color: var(--ink-soft);
  max-width: 36em;
  margin: 0 0 10px;
}
.hero .hero-stats {
  font-family: var(--sans); font-size: 14px; color: var(--ink-faint);
  margin-top: 26px;
}
.hero-rule {
  width: 56px; height: 4px; background: var(--seal);
  margin-top: 34px; border-radius: 1px;
}

.dir-head {
  display: flex; align-items: baseline; gap: 16px;
  margin-bottom: 6px;
}
.dir-head h2 { font-size: 22px; font-weight: 700; margin: 0; letter-spacing: .03em; }
.dir-head .muted { font-family: var(--sans); font-size: 13px; color: var(--ink-faint); }

.dir { border-top: 1px solid var(--hairline); }
.dir-row {
  border-bottom: 1px solid var(--hairline);
  padding: 30px 0 34px;
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 12px 48px;
}
.dir-cat { display: flex; flex-direction: column; gap: 8px; }
.dir-cat-name { display: flex; align-items: baseline; gap: 12px; }
.dir-cat-name .dot {
  width: 10px; height: 10px; border-radius: 2px; flex: none;
  transform: translateY(-1px);
}
.dir-cat-name a { font-size: 27px; font-weight: 900; color: var(--ink); letter-spacing: .04em; }
.dir-cat-name a:hover { color: var(--indigo-deep); text-decoration: none; }
.dir-cat-en { font-family: var(--sans); font-size: 12.5px; color: var(--ink-faint); letter-spacing: .05em; }
.dir-cat-count { font-family: var(--sans); font-size: 13px; color: var(--ink-soft); }
.dir-cat-count b { color: var(--ink); font-size: 15px; }
.dir-right { display: flex; flex-direction: column; gap: 14px; padding-top: 4px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: var(--sans); font-size: 13px;
  color: var(--ink-soft);
  border: 1px solid var(--hairline);
  background: #FCFBF8;
  border-radius: 999px;
  padding: 3px 12px;
}
.chip:hover { color: var(--ink); border-color: var(--ink-faint); text-decoration: none; }
.dir-latest { font-size: 15.5px; color: var(--ink-soft); line-height: 1.7; }
.dir-latest a { color: var(--ink); font-weight: 600; }
.dir-latest a:hover { color: var(--indigo-deep); }
.dir-latest .lbl { font-family: var(--sans); font-size: 12px; color: var(--ink-faint); margin-right: 10px; }

.list-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin: 72px 0 8px;
}
.list-head h2 { font-size: 22px; font-weight: 700; margin: 0; letter-spacing: .03em; }
.rows { border-top: 1px solid var(--hairline); }
.row {
  display: grid;
  grid-template-columns: 108px 1fr auto;
  gap: 20px;
  align-items: baseline;
  padding: 13px 0;
  border-bottom: 1px solid var(--hairline);
}
.row .date { font-family: var(--sans); font-size: 13.5px; color: var(--ink-faint); font-variant-numeric: tabular-nums; }
.row .title { font-size: 16.5px; font-weight: 600; color: var(--ink); line-height: 1.65; }
.row .title a { color: inherit; }
.row .title a:hover { color: var(--indigo-deep); }
.row .cat-tag { font-family: var(--sans); font-size: 12px; color: var(--ink-faint); white-space: nowrap; }
.row .cat-tag i { font-style: normal; display: inline-block; width: 7px; height: 7px; border-radius: 2px; margin-right: 7px; }

/* ---------- 面包屑 ---------- */
.crumbs {
  font-family: var(--sans); font-size: 13px;
  color: var(--ink-faint);
  padding: 30px 0 0;
}
.crumbs a { color: var(--ink-soft); }
.crumbs a:hover { color: var(--ink); }
.crumbs span.sep { margin: 0 8px; color: var(--hairline); }

/* ---------- 分类 / 子类页 ---------- */
.page-head { padding: 44px 0 34px; }
.page-head h1 { font-size: clamp(30px, 4.4vw, 44px); font-weight: 900; margin: 0 0 14px; letter-spacing: .03em; }
.page-head .desc { font-size: 17px; color: var(--ink-soft); max-width: 34em; margin: 0 0 8px; }
.page-head .count { font-family: var(--sans); font-size: 13.5px; color: var(--ink-faint); }

.subcat-sec { border-top: 1px solid var(--hairline); padding: 30px 0 34px; }
.subcat-sec:last-child { border-bottom: 1px solid var(--hairline); }
.subcat-line { display: flex; align-items: baseline; gap: 14px; margin-bottom: 14px; }
.subcat-line h2 { font-size: 21px; font-weight: 700; margin: 0; }
.subcat-line h2 a { color: var(--ink); }
.subcat-line h2 a:hover { color: var(--indigo-deep); text-decoration: none; }
.subcat-line .muted { font-family: var(--sans); font-size: 13px; color: var(--ink-faint); }
.subcat-line .all { margin-left: auto; font-family: var(--sans); font-size: 13.5px; }

/* 子类页年份 */
.year-sec { margin: 34px 0 8px; }
.year-sec h2 {
  font-size: 15px; font-weight: 700; color: var(--ink-soft);
  font-family: var(--sans); letter-spacing: .06em;
  margin: 0 0 4px;
}

/* ---------- 文章页 ---------- */
.article-shell {
  max-width: 1120px; margin: 0 auto;
  padding: 0 28px;
  display: grid;
  grid-template-columns: 76px minmax(0, 760px);
  justify-content: center;
  gap: 56px;
}
.spine {
  position: sticky; top: 40px;
  height: fit-content;
  padding-top: 96px;
  display: flex; flex-direction: column; align-items: center; gap: 14px;
  font-family: var(--sans);
}
.spine .spine-color { width: 3px; height: 84px; border-radius: 2px; }
.spine .spine-text {
  writing-mode: vertical-rl;
  font-size: 14px; letter-spacing: .34em;
  color: var(--ink-soft);
}
.spine .spine-count { writing-mode: vertical-rl; font-size: 11px; color: var(--ink-faint); letter-spacing: .2em; }

.article { padding: 64px 0 40px; }
.article > header { margin-bottom: 34px; }
.article h1 {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 900;
  line-height: 1.42;
  letter-spacing: .015em;
  margin: 0 0 20px;
}
.meta {
  font-family: var(--sans); font-size: 13.5px;
  color: var(--ink-faint);
  line-height: 2;
}
.meta a { color: var(--ink-soft); border-bottom: 1px solid var(--hairline); }
.meta a:hover { color: var(--indigo-deep); border-color: var(--ink-faint); text-decoration: none; }
.meta .meta-k { color: var(--ink-faint); }
.meta .meta-v { color: var(--ink-soft); }

.lede, .article-body blockquote {
  margin: 30px 0;
  padding: 2px 0 2px 22px;
  border-left: 3px solid var(--hairline);
}
.lede { color: var(--ink); font-size: 17.5px; }
.lede p { margin: 10px 0; }
.lede p.quote, .article-body blockquote p.quote {
  border-left: 3px solid var(--seal);
  margin: 14px 0 6px;
  padding-left: 20px;
  font-weight: 600;
}

.article-body { font-size: 17px; }
.article-body h2 {
  font-size: 24px; font-weight: 800; letter-spacing: .02em;
  margin: 2.4em 0 .8em; line-height: 1.5;
}
.article-body h3 { font-size: 19px; font-weight: 700; margin: 2em 0 .6em; }
.article-body p { margin: 1.1em 0; }
.article-body ul, .article-body ol { padding-left: 1.5em; margin: 1em 0; }
.article-body li { margin: .45em 0; }
.article-body li::marker { color: var(--ink-faint); }
.article-body strong { font-weight: 700; }
.article-body hr { border: none; border-top: 1px solid var(--hairline); margin: 3em auto; width: 100%; }
.article-body img { max-width: 100%; }
.article-body code {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: .86em; background: var(--paper-deep);
  padding: 2px 6px; border-radius: 4px;
}
.article-body pre { background: var(--paper-deep); padding: 18px 20px; border-radius: 6px; overflow-x: auto; }
.article-body pre code { background: none; padding: 0; }
.article-body table { border-collapse: collapse; width: 100%; margin: 1.6em 0; font-size: 15.5px; }
.article-body th, .article-body td { border: 1px solid var(--hairline); padding: 9px 13px; text-align: left; }
.article-body th { background: var(--paper-deep); font-weight: 700; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 40px 0 0; }
.tags .chip { cursor: default; }

.article-foot {
  margin-top: 56px;
  border-top: 1px solid var(--hairline);
  padding-top: 26px;
}
.origin-line { font-family: var(--sans); font-size: 14px; color: var(--ink-soft); margin-bottom: 34px; }
.origin-line a { color: var(--indigo); }
.pn { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.pn a { display: block; color: inherit; }
.pn a:hover { text-decoration: none; }
.pn .pn-k { font-family: var(--sans); font-size: 12px; color: var(--ink-faint); display: block; margin-bottom: 6px; }
.pn .pn-t { font-size: 16px; font-weight: 600; color: var(--ink); line-height: 1.6; }
.pn a:hover .pn-t { color: var(--indigo-deep); }
.pn .next { text-align: right; }

/* ---------- 搜索页 ---------- */
.search-head { padding: 60px 0 30px; }
.search-head h1 { font-size: 32px; font-weight: 900; margin: 0 0 24px; }
#search-input {
  width: 100%;
  font-family: var(--serif); font-size: 18px;
  color: var(--ink);
  background: #FCFBF8;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  padding: 14px 18px;
}
#search-input:focus { outline: none; border-color: var(--seal); box-shadow: 0 0 0 3px rgba(178,59,46,.12); }
#search-status { font-family: var(--sans); font-size: 13.5px; color: var(--ink-faint); margin: 18px 0 0; min-height: 1em; }
#search-results { margin-top: 10px; }
.sr-item { border-bottom: 1px solid var(--hairline); padding: 18px 0; }
.sr-item .sr-meta { font-family: var(--sans); font-size: 12.5px; color: var(--ink-faint); margin-bottom: 4px; }
.sr-item .sr-title { font-size: 17px; font-weight: 700; }
.sr-item .sr-title mark { background: #F3E3C9; color: inherit; padding: 0 1px; }
.sr-item .sr-snip { font-size: 14.5px; color: var(--ink-soft); margin-top: 5px; line-height: 1.8; }
.sr-item .sr-snip mark { background: #F3E3C9; color: inherit; padding: 0 1px; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--hairline);
  margin-top: 90px;
  padding: 34px 28px 46px;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-faint);
  text-align: center;
  line-height: 2;
}
.site-footer a { color: var(--ink-soft); }

/* ---------- 404 ---------- */
.lost { text-align: center; padding: 120px 0 60px; }
.lost .seal { margin: 0 auto 30px; }
.lost h1 { font-size: 34px; font-weight: 900; margin: 0 0 14px; }
.lost p { color: var(--ink-soft); }

/* ---------- 动效（仅一处） ---------- */
@media (prefers-reduced-motion: no-preference) {
  .hero, .page-head, .article > header { animation: rise .55s ease both; }
  @keyframes rise {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: none; }
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .dir-row { grid-template-columns: 1fr; gap: 16px; }
}
@media (max-width: 760px) {
  body { font-size: 16.5px; }
  .site-header, .wrap, .article-shell { padding-left: 20px; padding-right: 20px; }
  .spine { display: none; }
  .article-shell { grid-template-columns: minmax(0, 1fr); }
  .article { padding-top: 34px; }
  .hero { padding: 54px 0 44px; }
  .row { grid-template-columns: 84px 1fr; }
  .row .cat-tag { display: none; }
  .pn { grid-template-columns: 1fr; gap: 22px; }
  .pn .next { text-align: left; }
  .site-nav { margin-left: 0; }
}