.knowledge-page {
  overflow: auto;
  background-color: var(--paper);
  background-image: var(--paper-grain);
}

.knowledge-page a {
  color: inherit;
  text-decoration: none;
}

.knowledge-page a:focus-visible {
  outline: 2px solid var(--seal);
  outline-offset: 4px;
  border-radius: 4px;
}

.knowledge-skip {
  position: absolute;
  top: -80px;
  left: 24px;
  z-index: 10;
  padding: 12px 18px;
  border: 1px solid var(--seal);
  border-radius: 8px;
  background: var(--surface-1);
  color: var(--ink);
}

.knowledge-skip:focus { top: 16px; }

.knowledge-header,
.knowledge-shell,
.knowledge-footer {
  width: min(1000px, calc(100% - 48px));
  margin-inline: auto;
}

.knowledge-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-block: 18px;
  border-bottom: 1px solid var(--line);
}

.knowledge-brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
}

.knowledge-brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  border-radius: 6px 12px 6px 12px;
  background: var(--seal);
  color: var(--seal-ink);
  font: var(--fs-2xl)/1 var(--serif);
}

.knowledge-brand-mark::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid currentColor;
  border-radius: 3px 8px 3px 8px;
  opacity: .35;
}

.knowledge-brand-name {
  color: var(--ink);
  font: 600 var(--fs-xl)/1.2 var(--serif);
  letter-spacing: 4px;
}

.knowledge-brand-name > span {
  display: block;
  margin-top: 5px;
  color: var(--ink-soft);
  font: var(--fs-xs)/1.4 var(--sans);
  letter-spacing: 1px;
}

.knowledge-back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  gap: 8px;
  min-height: 44px;
  padding: 10px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: var(--fs-md);
  background: var(--surface-1);
  transition: border-color .16s, color .16s;
}

.knowledge-back:hover { border-color: var(--seal); color: var(--seal); }

.knowledge-hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 52px;
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.knowledge-hero-copy { min-width: 0; max-width: 720px; }

.knowledge-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  color: var(--seal);
  font: var(--fs-md)/1.5 var(--serif);
  letter-spacing: 4px;
}

.knowledge-kicker::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--seal);
}

.knowledge-hero h1 {
  color: var(--ink);
  font: 500 clamp(28px, 3vw, 36px)/1.25 var(--serif);
  letter-spacing: 6px;
}

.knowledge-lead {
  max-width: 660px;
  margin-top: 16px;
  color: var(--ink-soft);
  font-size: var(--fs-base);
  line-height: 1.8;
}

.knowledge-hero-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  gap: 6px;
  width: 72px;
  padding: 16px 10px;
  margin-right: 36px;
  border: 1px solid var(--line);
  outline: 1px solid var(--line);
  outline-offset: -6px;
  border-radius: 6px 18px 6px 18px;
  color: var(--gold-ink);
  font: var(--fs-3xl)/1.15 var(--serif);
}

.knowledge-layout {
  display: grid;
  grid-template-columns: 168px minmax(0, 720px);
  justify-content: space-between;
  align-items: start;
  gap: 32px;
  padding-block: 28px 40px;
}

.knowledge-toc {
  position: sticky;
  top: 28px;
  min-width: 0;
}

.knowledge-toc-title {
  margin-bottom: 18px;
  color: var(--ink-soft);
  font-size: var(--fs-sm);
  letter-spacing: 2px;
}

.knowledge-toc ol { display: grid; gap: 6px; list-style: none; }

.knowledge-toc a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  min-height: 44px;
  padding: 11px 10px;
  border-left: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: var(--fs-base);
  line-height: 1.5;
  transition: color .16s, background-color .16s, border-color .16s;
}

.knowledge-toc a > span { color: var(--ink-soft); font: var(--fs-xs)/1.9 var(--mono); }
.knowledge-toc a:hover { background: var(--seal-softer); border-color: var(--seal); color: var(--seal); }
.knowledge-article { min-width: 0; max-width: 760px; }

.knowledge-section {
  scroll-margin-top: 28px;
  padding-top: 26px;
  margin-top: 28px;
  border-top: 1px solid var(--line);
}

.knowledge-section:first-child { padding-top: 0; margin-top: 0; border-top: 0; }

.knowledge-section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
}

.knowledge-section-head > span { flex: 0 0 auto; color: var(--seal); font: var(--fs-sm)/1.5 var(--mono); }
.knowledge-section h2 { color: var(--ink); font: 600 var(--fs-xl)/1.5 var(--serif); letter-spacing: 1px; }
.knowledge-section p { color: var(--ink-soft); font-size: var(--fs-base); line-height: 1.8; }
.knowledge-section > p + p { margin-top: 16px; }
.knowledge-section strong { color: var(--ink); font-weight: 600; }

.knowledge-question {
  margin: 18px 0 8px;
  color: var(--ink);
  font-size: var(--fs-base);
  font-weight: 600;
  line-height: 1.8;
}

.knowledge-section-head + .knowledge-question { margin-top: 0; }

.knowledge-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }

.knowledge-card {
  --card-accent: var(--seal);
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-1);
}

.knowledge-card[data-system="ziwei"] { --card-accent: var(--gold-ink); }
.knowledge-card[data-system="liuyao"] { --card-accent: var(--jade); }
.knowledge-card[data-system="qimen"] { --card-accent: var(--water); }

.knowledge-card-head { display: flex; align-items: center; gap: 13px; margin-bottom: 16px; }

.knowledge-card-head > span {
  display: grid;
  place-items: center;
  flex: 0 0 30px;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line);
  border-radius: 4px 8px 4px 8px;
  color: var(--card-accent);
  font: var(--fs-lg)/1 var(--serif);
}

.knowledge-card h3 { color: var(--ink); font: 600 var(--fs-xl)/1.4 var(--serif); letter-spacing: 1px; }
.knowledge-card p { font-size: var(--fs-base); line-height: 1.9; }

.knowledge-disclaimer {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  margin-top: 28px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--seal);
  border-radius: 4px 14px 14px 4px;
  background: var(--seal-softer);
}

.knowledge-disclaimer-mark { flex: 0 0 auto; color: var(--seal); font: var(--fs-3xl)/1.2 var(--serif); }
.knowledge-disclaimer p { color: var(--ink-soft); font-size: var(--fs-base); line-height: 1.9; }
.knowledge-disclaimer strong { color: var(--seal); font-weight: 600; }

.knowledge-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 24px;
  padding-block: 22px 36px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: var(--fs-sm);
}

.knowledge-footer a { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; }
.knowledge-footer a:hover { color: var(--seal); }

@media (max-width: 900px) {
  .knowledge-layout { grid-template-columns: 1fr; gap: 24px; }
  .knowledge-toc { position: static; padding: 18px; border: 1px solid var(--line); border-radius: 12px; }
  .knowledge-toc-title { margin-bottom: 10px; }
  .knowledge-toc ol { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 4px 12px; }
  .knowledge-toc a { border-left: 0; border-radius: 6px; padding-inline: 0; }
  .knowledge-article { width: 100%; margin-inline: auto; }
  .knowledge-hero-mark { margin-right: 8px; }
}

@media (max-width: 600px) {
  .knowledge-header, .knowledge-shell, .knowledge-footer { width: calc(100% - 40px); }
  .knowledge-header { gap: 12px; padding-block: 12px; }
  .knowledge-brand { gap: 10px; }
  .knowledge-brand-mark { flex-basis: 38px; width: 38px; height: 38px; font-size: var(--fs-2xl); }
  .knowledge-brand-name { font-size: var(--fs-xl); letter-spacing: 3px; }
  .knowledge-brand-name > span { font-size: var(--fs-2xs); letter-spacing: 0; }
  .knowledge-back { gap: 6px; padding-inline: 12px; font-size: var(--fs-sm); }
  .knowledge-hero { padding-block: 22px; }
  .knowledge-hero-mark { display: none; }
  .knowledge-kicker { margin-bottom: 14px; font-size: var(--fs-sm); }
  .knowledge-hero h1 { font-size: var(--fs-3xl); letter-spacing: 4px; }
  .knowledge-lead { margin-top: 12px; font-size: var(--fs-base); line-height: 1.9; }
  .knowledge-layout { padding-block: 20px 28px; gap: 24px; }
  .knowledge-toc { padding: 14px 16px; }
  .knowledge-toc ol { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2px 8px; }
  .knowledge-toc a { gap: 10px; font-size: var(--fs-md); }
  .knowledge-section { margin-top: 24px; padding-top: 22px; }
  .knowledge-section-head { gap: 10px; margin-bottom: 18px; }
  .knowledge-section h2 { font-size: var(--fs-xl); letter-spacing: .5px; }
  .knowledge-section-head > span { font-size: var(--fs-xs); }
  .knowledge-cards { grid-template-columns: 1fr; gap: 12px; }
  .knowledge-card { padding: 14px; border-radius: 10px; }
  .knowledge-card-head { margin-bottom: 12px; }
  .knowledge-card h3 { font-size: var(--fs-xl); }
  .knowledge-disclaimer { gap: 12px; padding: 20px 16px; margin-top: 30px; }
  .knowledge-disclaimer-mark { font-size: var(--fs-2xl); }
  .knowledge-footer { padding-block: 16px 24px; }
}

@media (prefers-reduced-motion: reduce) {
  .knowledge-page *, .knowledge-page *::before, .knowledge-page *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

@media (min-width: 901px) and (pointer: fine) {
  .knowledge-toc a { min-height: 36px; padding-block: 7px; font-size: var(--fs-md); }
  .knowledge-back { min-height: 36px; padding-block: 7px; }
}

.knowledge-footer-links { display: inline-flex; gap: 18px; }