/* Wenjun base — editorial / paper design language */
:root {
  --paper: #f4efe4;
  --paper-2: #faf7f0;
  --ink: #1e1a16;
  --ink-2: #5d554c;
  --ink-3: #8b827a;
  --rule: #d8cfbf;
  --rule-strong: #b9ad98;
  --seal: #a8321f;
  --seal-soft: #f1ddd6;
  --indigo: #2c3a55;
  --font-serif: "Noto Serif SC","Songti SC","STSong","Source Han Serif SC","SimSun","Iowan Old Style","Palatino Linotype",Georgia,serif;
  --font-sans: -apple-system,"PingFang SC","Helvetica Neue","Microsoft YaHei",sans-serif;
  --font-mono: "SF Mono",Menlo,Consolas,monospace;
  --measure: 68ch;
  --lh-body: 1.9;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: var(--lh-body);
}
img { max-width: 100%; }
h1, h2, h3, h4 { font-weight: 600; letter-spacing: 0.02em; line-height: 1.4; margin: 0 0 0.5em; }
p { margin: 0 0 1em; }
a { color: var(--indigo); text-decoration: none; }
a:hover { color: var(--seal); }
a:focus-visible, button:focus-visible, input:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--seal);
  outline-offset: 2px;
}

/* ---------- utilities ---------- */
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.measure { max-width: var(--measure); }
.label {
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.mono { font-family: var(--font-mono); font-size: 0.85em; }
.muted { color: var(--ink-3); }
.rule { border: 0; border-top: 1px solid var(--rule); margin: 24px 0; }
.rule-double {
  border: 0;
  border-top: 2px solid var(--seal);
  margin: 24px 0;
  position: relative;
  height: 6px;
}
.rule-double::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 4px;
  border-top: 1px solid var(--seal);
}
.sheet {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 32px;
}
.stamp {
  display: inline-block;
  border: 1.5px solid var(--seal);
  border-radius: 2px;
  color: var(--seal);
  letter-spacing: 0.12em;
  padding: 2px 8px;
  font-size: 13px;
  transform: rotate(-3deg);
  opacity: 0.9;
}
.btn {
  font-family: var(--font-serif);
  font-size: 15px;
  background: transparent;
  border: 1px solid var(--ink);
  border-radius: 2px;
  color: var(--ink);
  padding: 8px 20px;
  cursor: pointer;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn-seal { border-color: var(--seal); color: var(--seal); }
.btn-seal:hover { background: var(--seal); color: var(--paper); }
.input {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule-strong);
  border-radius: 0;
  padding: 10px 2px;
  width: 100%;
}
.input::placeholder { color: var(--ink-3); }
.input:focus { outline: none; border-bottom-color: var(--seal); }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.stack-2 > * + * { margin-top: 8px; }
.stack-3 > * + * { margin-top: 12px; }
.stack-4 > * + * { margin-top: 16px; }
.cluster { display: inline-flex; flex-wrap: wrap; gap: 8px; align-items: center; }

/* ---------- masthead / footer ---------- */
.masthead { border-top: 1px solid var(--rule-strong); border-bottom: 1px solid var(--rule); }
.masthead-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 0;
}
.brand { display: flex; align-items: flex-start; gap: 14px; color: var(--ink); }
.brand:hover { color: var(--ink); }
.brand-text { display: flex; flex-direction: column; }
/* 43px seal, dropped 2px, meets the ink of 28px 问津 and the 12px subtitle. */
.brand-seal { display: block; width: 43px; height: 43px; flex: none; margin-top: 2px; }
.brand-name { display: block; font-size: 28px; font-weight: 600; letter-spacing: 0.02em; line-height: 1; }
.brand-sub { display: block; margin-top: 6px; line-height: 1; }
.nav { display: flex; gap: 28px; font-size: 15px; }
.nav a { color: var(--ink-2); padding-bottom: 3px; }
.nav a:hover { color: var(--seal); }
.nav a.is-active { color: var(--seal); border-bottom: 1px solid var(--seal); }

.site-footer { border-top: 1px solid var(--rule); margin-top: 64px; padding: 24px 0 40px; }
.site-footer p { margin: 0; }
.site-footer p + p { margin-top: 8px; }
.footer-credit { text-transform: none; }

/* ---------- shared components ---------- */
.ask-form { display: flex; gap: 16px; align-items: flex-end; }
.ask-form .input { flex: 1; }

.index-row {
  display: grid;
  grid-template-columns: 104px 1fr auto;
  gap: 20px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}
.index-row .date { color: var(--ink-2); white-space: nowrap; }
.index-row .title { font-size: 17px; }
.index-row .meta { margin-top: 2px; font-size: 13px; color: var(--ink-3); }

.cite a {
  color: var(--seal);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 0 2px;
}
.cite a:hover { background: var(--seal-soft); color: var(--seal); }

.markdown-body p { text-align: justify; text-justify: inter-ideograph; line-break: strict; }
.markdown-body h2, .markdown-body h3 { margin-top: 1.6em; }
.markdown-body a { text-decoration: underline; text-underline-offset: 3px; }
.markdown-body blockquote {
  margin: 1em 0; padding: 4px 0 4px 16px;
  border-left: 2px solid var(--seal); color: var(--ink-2);
}
.markdown-body table { border-collapse: collapse; margin: 1em 0; width: 100%; }
.markdown-body th, .markdown-body td { border: 1px solid var(--rule); padding: 6px 12px; font-size: 15px; }
.markdown-body code { font-family: var(--font-mono); font-size: 0.85em; background: var(--seal-soft); padding: 0 4px; }
.markdown-body pre { border: 1px solid var(--rule); padding: 16px; overflow-x: auto; }
.markdown-body pre code { background: none; padding: 0; }