:root {
  --knowledge-accent: #0f766e;
  --knowledge-warm: #c26a3d;
  --knowledge-soft: #edf5f1;
}

.knowledge-hub-hero { padding-block: clamp(28px, 4vw, 54px); }
.knowledge-hero-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(320px, .75fr); gap: clamp(32px, 7vw, 110px); align-items: end; }
.knowledge-hero-grid h1 { max-width: 850px; margin: 9px 0 14px; font-size: clamp(36px, 4.6vw, 64px); letter-spacing: -.055em; }
.knowledge-hero-grid > div > p { max-width: 720px; margin: 0; color: var(--muted); font-size: clamp(17px, 1.4vw, 21px); line-height: 1.75; }
.knowledge-hero-grid .btn { margin-top: 24px; }
.knowledge-hero-grid dl { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; border: 1px solid var(--line); border-radius: 18px; overflow: hidden; background: color-mix(in srgb, var(--panel) 88%, transparent); }
.knowledge-hero-grid dl div { min-width: 0; padding: 24px 18px; border-right: 1px solid var(--line); }
.knowledge-hero-grid dl div:last-child { border-right: 0; }
.knowledge-hero-grid dt { font-size: clamp(24px, 2.3vw, 38px); font-weight: 900; }
.knowledge-hero-grid dd { margin: 7px 0 0; color: var(--muted); font-size: 13px; }
.knowledge-hero-actions { display: grid; gap: 9px; }
.knowledge-hero-actions a { display: grid; gap: 3px; padding: 16px 18px; border: 1px solid var(--line); border-radius: 15px; background: color-mix(in srgb, var(--panel) 90%, transparent); color: inherit; text-decoration: none; transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease; }
.knowledge-hero-actions a:is(:hover, :focus-visible) { transform: translateY(-2px); border-color: color-mix(in srgb, var(--knowledge-accent) 52%, var(--line)); box-shadow: 0 12px 28px rgba(19, 52, 47, .09); }
.knowledge-hero-actions strong { font-size: 15px; }
.knowledge-hero-actions span { color: var(--muted); font-size: 12px; }

.idiom-library { display: grid; gap: 42px; }
.idiom-browser { display: grid; gap: 20px; padding: clamp(20px, 3vw, 34px); border: 1px solid var(--line); border-radius: 22px; background: var(--panel); box-shadow: var(--shadow-soft); }
.idiom-browser > label { font-size: 14px; font-weight: 850; }
.idiom-search-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 14px; }
.idiom-search-row input { min-width: 0; min-height: 54px; padding: 0 17px; border: 1px solid var(--line); border-radius: 12px; background: var(--background); color: var(--text); font: inherit; }
.idiom-search-row span { color: var(--muted); font-weight: 800; }
.idiom-filter-group { display: grid; grid-template-columns: 92px minmax(0, 1fr); gap: 14px; align-items: start; }
.idiom-filter-group > strong { padding-top: 8px; font-size: 13px; }
.idiom-filter-list { display: flex; flex-wrap: wrap; gap: 8px; }
.idiom-filter-list button { min-height: 36px; padding: 7px 13px; border: 1px solid var(--line); border-radius: 999px; background: var(--background); color: var(--text); font: inherit; font-size: 13px; font-weight: 750; cursor: pointer; }
.idiom-filter-list button:is(:hover, :focus-visible, .is-active) { border-color: var(--knowledge-accent); background: var(--knowledge-accent); color: #fff; }
.idiom-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.idiom-card { min-width: 0; }
.idiom-card > a { position: relative; display: flex; min-height: 260px; flex-direction: column; padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); color: inherit; text-decoration: none; overflow: hidden; transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.idiom-card > a::after { content: ""; position: absolute; right: -36px; bottom: -44px; width: 126px; height: 126px; border-radius: 50%; background: color-mix(in srgb, var(--knowledge-accent) 12%, transparent); }
.idiom-card > a:is(:hover, :focus-visible) { transform: translateY(-4px); border-color: color-mix(in srgb, var(--knowledge-accent) 48%, var(--line)); box-shadow: 0 18px 38px rgba(19, 52, 47, .12); }
.idiom-card-source { align-self: flex-start; padding: 5px 9px; border-radius: 999px; background: var(--knowledge-soft); color: var(--knowledge-accent); font-size: 12px; font-weight: 850; }
.idiom-card-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 7px; }
.idiom-type-pill { display: inline-flex; padding: 5px 9px; border-radius: 999px; background: var(--knowledge-accent); color: #fff; font-size: 12px; font-weight: 850; }
.idiom-card h2 { margin: 20px 0 4px; font-size: clamp(24px, 2vw, 32px); letter-spacing: -.04em; }
.idiom-card .idiom-pinyin { margin: 0 0 16px; color: var(--knowledge-warm); font-size: 13px; font-weight: 750; }
.idiom-card > a > p:not(.idiom-pinyin) { margin: 0 0 22px; color: var(--muted); line-height: 1.7; }
.idiom-card .text-link { position: relative; z-index: 1; margin-top: auto; font-weight: 850; }
.knowledge-source-links { display: grid; grid-template-columns: minmax(260px, .6fr) minmax(0, 1.4fr); gap: 50px; align-items: start; }
.knowledge-source-links > div:last-child { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.knowledge-source-links a { display: flex; justify-content: space-between; gap: 10px; padding: 15px 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); color: inherit; text-decoration: none; }
.knowledge-source-links a span { color: var(--muted); font-size: 12px; }

.idiom-detail-hero { padding-block: clamp(26px, 3.6vw, 48px); }
.idiom-title-block { max-width: 940px; padding-top: 28px; }
.idiom-source-pill { display: inline-flex; padding: 7px 11px; border-radius: 999px; background: var(--knowledge-soft); color: var(--knowledge-accent); font-size: 13px; font-weight: 850; }
.idiom-title-block h1 { margin: 16px 0 2px; font-size: clamp(44px, 5.8vw, 76px); letter-spacing: -.07em; }
.idiom-title-block .idiom-pinyin { margin: 0 0 22px; color: var(--knowledge-warm); font-size: clamp(17px, 1.6vw, 23px); }
.idiom-lead { max-width: 820px; color: var(--muted); font-size: clamp(19px, 1.8vw, 25px); line-height: 1.7; }
.idiom-title-block .btn { margin-top: 12px; }
.idiom-detail-layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 24px; align-items: start; }
.idiom-detail-main { display: grid; gap: 18px; }
.idiom-detail-main .content-panel, .idiom-detail-aside .content-panel { margin: 0; padding: clamp(24px, 3vw, 38px); }
.idiom-detail-main h2, .idiom-detail-aside h2 { margin-top: 6px; }
.idiom-context-panel blockquote { margin: 22px 0; padding: 22px 24px; border: 0; border-left: 4px solid var(--knowledge-warm); border-radius: 0 14px 14px 0; background: color-mix(in srgb, var(--knowledge-warm) 8%, var(--background)); font-family: var(--reading-font, serif); font-size: 18px; line-height: 2; }
.idiom-context-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; }
.idiom-usage-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.idiom-usage-grid .is-warning { border-color: color-mix(in srgb, var(--knowledge-warm) 35%, var(--line)); }
.idiom-example { padding: 20px 22px; border-radius: 14px; background: var(--knowledge-soft); font-size: 18px; line-height: 1.8; }
.term-pair-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.term-pair-grid > div { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; padding: 18px; border: 1px solid var(--line); border-radius: 14px; }
.term-pair-grid span { width: 100%; color: var(--muted); font-size: 12px; }
.term-pair-grid strong { padding: 6px 10px; border-radius: 999px; background: var(--background); }
.related-idiom-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.related-idiom-list a { display: grid; gap: 5px; padding: 16px; border: 1px solid var(--line); border-radius: 13px; color: inherit; text-decoration: none; }
.related-idiom-list a:hover { border-color: var(--knowledge-accent); }
.related-idiom-list span { color: var(--muted); font-size: 13px; line-height: 1.6; }
.idiom-detail-aside { position: sticky; top: 94px; display: grid; gap: 18px; }
.idiom-facts { display: grid; gap: 0; margin: 0; }
.idiom-facts div { padding: 13px 0; border-bottom: 1px solid var(--line); }
.idiom-facts div:last-child { border-bottom: 0; }
.idiom-facts dt { color: var(--muted); font-size: 12px; }
.idiom-facts dd { margin: 5px 0 0; font-weight: 800; }
.idiom-related-books { display: grid; gap: 12px; }
.idiom-related-books a { display: grid; grid-template-columns: 54px minmax(0, 1fr); gap: 11px; align-items: center; color: inherit; text-decoration: none; }
.idiom-related-books img { width: 54px; aspect-ratio: 3 / 4; border-radius: 7px; object-fit: cover; }
.idiom-related-books span { display: grid; gap: 4px; min-width: 0; }
.idiom-related-books strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.idiom-related-books small { color: var(--muted); }

.english-hub-hero { background: linear-gradient(135deg, color-mix(in srgb, var(--knowledge-soft) 82%, var(--background)), var(--background)); }
.english-anchor-nav { display: flex; flex-wrap: wrap; gap: 8px; padding-block: 18px; }
.english-anchor-nav a { padding: 8px 13px; border: 1px solid var(--line); border-radius: 999px; color: inherit; font-size: 13px; font-weight: 800; text-decoration: none; }
.english-anchor-nav a:is(:hover, :focus-visible) { border-color: var(--knowledge-accent); color: var(--knowledge-accent); }
.english-curated-grid, .english-catalog-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: clamp(14px, 1.6vw, 24px); }
.english-book-card { display: flex; min-width: 0; flex-direction: column; }
.english-book-cover { display: block; border-radius: 12px; overflow: hidden; background: var(--surface-muted); box-shadow: 0 8px 24px rgba(21, 35, 32, .1); }
.english-book-cover img { display: block; width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover; transition: transform .25s ease; }
.english-book-card:hover .english-book-cover img { transform: scale(1.025); }
.english-book-card > div { display: flex; flex: 1; flex-direction: column; padding-top: 12px; }
.english-book-type { align-self: flex-start; padding: 4px 8px; border-radius: 999px; background: var(--knowledge-soft); color: var(--knowledge-accent); font-size: 11px; font-weight: 800; }
.english-book-card h3 { min-height: 2.65em; margin: 8px 0 5px; display: -webkit-box; overflow: hidden; -webkit-line-clamp: 2; -webkit-box-orient: vertical; font-size: 17px; line-height: 1.3; }
.english-book-card h3 a { color: inherit; text-decoration: none; }
.english-book-card > div > p { min-height: 2.7em; margin: 0 0 10px; color: var(--muted); font-size: 12px; line-height: 1.45; }
.english-book-card .english-chinese-title { min-height: 0; margin: -1px 0 5px; color: var(--knowledge-accent); font-weight: 800; }
.english-book-facts { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 12px; }
.english-book-facts span { padding: 4px 7px; border-radius: 999px; background: var(--surface-muted); color: var(--muted); font-size: 10px; font-weight: 750; }
.english-book-card .btn { width: 100%; margin-top: auto; }
.english-catalog-controls { display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 12px; margin-bottom: 28px; padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
.english-catalog-controls label { display: grid; gap: 7px; }
.english-catalog-controls label span { font-size: 12px; font-weight: 800; }
.english-catalog-controls :is(input, select) { width: 100%; min-width: 0; min-height: 44px; padding: 0 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--background); color: var(--text); font: inherit; }
.english-load-more { display: block; margin: 30px auto 0; }
.chinese-hub-hero { background: linear-gradient(135deg, color-mix(in srgb, #f3e8d2 44%, var(--background)), var(--background)); }
.chinese-catalog-controls { grid-template-columns: minmax(0, 2fr) minmax(220px, .8fr); }
.knowledge-library-entry-grid { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; }

@media (max-width: 1180px) {
  .idiom-grid { grid-template-columns: repeat(3, 1fr); }
  .english-curated-grid, .english-catalog-grid { grid-template-columns: repeat(4, 1fr); }
  .knowledge-source-links > div:last-child { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 820px) {
  .knowledge-hero-grid, .knowledge-source-links, .idiom-detail-layout { grid-template-columns: 1fr; }
  .knowledge-hero-grid dl { max-width: 560px; }
  .idiom-grid { grid-template-columns: repeat(2, 1fr); }
  .idiom-detail-aside { position: static; grid-template-columns: repeat(2, 1fr); }
  .idiom-detail-aside .content-panel:last-child { grid-column: 1 / -1; }
  .english-curated-grid, .english-catalog-grid { grid-template-columns: repeat(3, 1fr); }
  .english-catalog-controls { grid-template-columns: repeat(2, 1fr); }
  .knowledge-library-entry-grid { grid-template-columns: 1fr !important; }
}

@media (max-width: 560px) {
  .knowledge-hero-grid dl { grid-template-columns: 1fr 1fr 1fr; }
  .knowledge-hero-actions { grid-template-columns: 1fr; }
  .knowledge-hero-grid dl div { padding: 16px 10px; }
  .knowledge-hero-grid dd { font-size: 10px; }
  .idiom-filter-group { grid-template-columns: 1fr; gap: 7px; }
  .idiom-filter-group > strong { padding-top: 0; }
  .idiom-grid { grid-template-columns: 1fr; }
  .idiom-card > a { min-height: 220px; }
  .idiom-usage-grid, .term-pair-grid, .related-idiom-list, .idiom-detail-aside { grid-template-columns: 1fr; }
  .idiom-detail-aside .content-panel:last-child { grid-column: auto; }
  .knowledge-source-links > div:last-child { grid-template-columns: 1fr; }
  .english-curated-grid, .english-catalog-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 9px; }
  .english-book-card h3 { min-height: 2.7em; font-size: 13px; }
  .english-book-card > div > p { min-height: 2.7em; font-size: 10px; }
  .english-book-facts span { padding: 3px 5px; font-size: 9px; }
  .english-book-facts span:nth-child(3) { display: none; }
  .english-book-card .btn { min-height: 38px; padding-inline: 5px; font-size: 11px; }
  .english-catalog-controls { grid-template-columns: 1fr 1fr; padding: 14px; }
  .english-catalog-controls label:first-child { grid-column: 1 / -1; }
  .chinese-catalog-controls { grid-template-columns: 1fr; }
  .chinese-catalog-controls label:first-child { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
  .idiom-card > a, .english-book-cover img { transition: none; }
}