:root{
  --seo-ink:#10213c;
  --seo-muted:#61708a;
  --seo-line:#dce5f0;
  --seo-bg:#f4f7fb;
  --seo-card:#fff;
  --seo-primary:#1557d5;
  --seo-primary-dark:#0d3f9f;
  --seo-soft:#edf4ff;
  --seo-success:#087a55;
  --seo-radius:20px;
  --seo-shadow:0 18px 50px rgba(21,45,82,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body.seo-public-page{margin:0;background:var(--seo-bg);color:var(--seo-ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;overflow-wrap:anywhere}
body.seo-public-page img{max-width:100%;height:auto}
body.seo-public-page a{color:inherit}
.seo-skip-link{position:fixed;left:12px;top:-100px;z-index:9999;padding:10px 14px;background:#fff;border-radius:10px;box-shadow:var(--seo-shadow)}
.seo-skip-link:focus{top:12px}
.seo-site-header{position:sticky;top:0;z-index:100;background:rgba(12,28,54,.96);color:#fff;backdrop-filter:blur(14px);box-shadow:0 1px 0 rgba(255,255,255,.08)}
.seo-site-header-inner{width:min(1120px,100%);margin:auto;min-height:68px;padding:10px 18px;display:flex;align-items:center;gap:18px}
.seo-brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;min-width:max-content;font-weight:900}
.seo-brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:#ef4d4d;font-size:23px}
.seo-brand-copy{display:flex;flex-direction:column;line-height:1.1}.seo-brand-copy small{margin-top:4px;font-size:11px;color:#b9c5d9;font-weight:600}
.seo-header-search{display:flex;flex:1;max-width:660px;margin-left:auto;background:#fff;border-radius:14px;overflow:hidden;box-shadow:0 0 0 1px rgba(255,255,255,.15)}
.seo-header-search input{min-width:0;flex:1;border:0;outline:0;padding:12px 14px;font:inherit;font-size:16px;color:var(--seo-ink)}
.seo-header-search button{min-width:48px;border:0;background:var(--seo-primary);color:#fff;font-size:18px;font-weight:900;cursor:pointer}
.seo-shell{width:min(1120px,100%);margin:0 auto;padding:22px 18px 64px}
.seo-breadcrumbs{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:0 0 18px;color:var(--seo-muted);font-size:14px}
.seo-breadcrumbs a{color:var(--seo-primary);text-decoration:none}.seo-breadcrumbs a:hover{text-decoration:underline}
.seo-hero-card,.seo-entry-card,.seo-panel{background:var(--seo-card);border:1px solid var(--seo-line);border-radius:var(--seo-radius);box-shadow:var(--seo-shadow)}
.seo-hero-card{padding:28px;margin-bottom:20px;background:linear-gradient(135deg,#fff 0%,#f4f8ff 100%)}
.seo-kicker{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:var(--seo-soft);color:var(--seo-primary-dark);font-size:12px;font-weight:900;letter-spacing:.06em;text-transform:uppercase}
.seo-hero-card h1{max-width:850px;margin:14px 0 10px;font-size:clamp(30px,5vw,52px);line-height:1.08;letter-spacing:-.035em}
.seo-hero-card p{max-width:820px;margin:0;color:var(--seo-muted);font-size:17px;line-height:1.7}
.seo-search-large{display:flex;gap:10px;margin-top:22px;max-width:820px}
.seo-search-large input{flex:1;min-width:0;border:1px solid #bac9dc;border-radius:14px;padding:14px 16px;font:inherit;font-size:16px;outline:none;background:#fff}
.seo-search-large input:focus{border-color:var(--seo-primary);box-shadow:0 0 0 4px rgba(21,87,213,.12)}
.seo-search-large button,.seo-button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;border:0;border-radius:14px;padding:12px 18px;background:var(--seo-primary);color:#fff;text-decoration:none;font-weight:900;cursor:pointer}
.seo-button:hover,.seo-header-search button:hover,.seo-search-large button:hover{background:var(--seo-primary-dark)}
.seo-button.secondary{background:var(--seo-soft);color:var(--seo-primary-dark)}
.seo-section-title{display:flex;align-items:end;justify-content:space-between;gap:16px;margin:28px 0 14px}.seo-section-title h2{margin:0;font-size:clamp(22px,3vw,30px)}.seo-section-title p{margin:0;color:var(--seo-muted)}
.seo-entry-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.seo-word-link{display:block;min-width:0;padding:18px;background:#fff;border:1px solid var(--seo-line);border-radius:18px;text-decoration:none;transition:transform .16s ease,border-color .16s ease,box-shadow .16s ease}
.seo-word-link:hover{transform:translateY(-2px);border-color:#9db8e7;box-shadow:0 12px 32px rgba(21,45,82,.1)}
.seo-word-head{display:flex;align-items:baseline;gap:10px}.seo-word-head strong{font-size:30px;line-height:1.15}.seo-word-head span{min-width:0;color:var(--seo-primary);font-weight:800;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.seo-word-link p{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin:10px 0 0;color:#40516d;line-height:1.55}
.seo-word-meta{display:flex;gap:7px;flex-wrap:wrap;margin-top:12px}.seo-chip{display:inline-flex;padding:5px 8px;border-radius:999px;background:#f0f4f9;color:#53647e;font-size:12px;font-weight:800}
.seo-pagination{display:flex;align-items:center;justify-content:center;gap:7px;flex-wrap:wrap;margin:28px 0}.seo-pagination a,.seo-pagination span{display:grid;place-items:center;min-width:42px;min-height:42px;padding:8px 11px;border:1px solid var(--seo-line);border-radius:12px;background:#fff;text-decoration:none;font-weight:800}.seo-pagination .current{background:var(--seo-primary);border-color:var(--seo-primary);color:#fff}.seo-pagination .disabled{opacity:.45}
.seo-empty{padding:34px;text-align:center;background:#fff;border:1px dashed #b8c7da;border-radius:18px;color:var(--seo-muted)}
.seo-entry-card{padding:30px}
.seo-entry-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.seo-entry-hanzi{margin:0;font-size:clamp(58px,10vw,92px);line-height:1;font-weight:950;letter-spacing:-.055em}.seo-entry-traditional{margin-left:10px;color:#8090a8;font-size:20px}.seo-entry-pinyin{margin:12px 0 0;color:var(--seo-primary);font-size:clamp(22px,4vw,30px);font-weight:800}.seo-entry-question{margin:18px 0 0;font-size:clamp(26px,4vw,38px);line-height:1.2;letter-spacing:-.025em}
.seo-badges{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.seo-badge{padding:7px 10px;border-radius:999px;background:var(--seo-soft);color:var(--seo-primary-dark);font-size:13px;font-weight:850}.seo-badge.verified{background:#e9fbf4;color:var(--seo-success)}.seo-badge.warning{background:#fff3e1;color:#9a5700}
.seo-definition{margin:22px 0 0;padding:22px;border-left:5px solid var(--seo-primary);border-radius:0 16px 16px 0;background:#f6f9fe}.seo-definition h2{margin:0 0 10px;font-size:16px;color:var(--seo-muted)}.seo-definition p{margin:0;font-size:clamp(21px,3.6vw,29px);line-height:1.55;font-weight:750}.seo-definition ol{margin:0;padding-left:1.35em}.seo-definition li{margin:.45em 0;font-size:clamp(18px,3vw,24px);line-height:1.55;font-weight:720}.seo-definition li::marker{color:var(--seo-primary);font-weight:900}
.seo-detail-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(260px,.42fr);gap:18px;margin-top:18px}.seo-detail-main,.seo-detail-side{display:grid;align-content:start;gap:16px}
.seo-panel{padding:20px;box-shadow:none}.seo-panel h2{margin:0 0 12px;font-size:19px}.seo-panel p{margin:0;color:#354762;line-height:1.7}.seo-example-zh{font-size:25px!important;font-weight:850;color:var(--seo-ink)!important}.seo-example-pinyin{margin-top:5px!important;color:var(--seo-primary)!important}.seo-example-vi{margin-top:9px!important}
.seo-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}.seo-actions button{font:inherit}
.seo-source{font-size:13px;color:var(--seo-muted);line-height:1.6}.seo-source a{color:var(--seo-primary)}
.seo-related{margin-top:28px}
.seo-footer{border-top:1px solid var(--seo-line);background:#fff}.seo-footer-inner{width:min(1120px,100%);margin:auto;padding:28px 18px;display:flex;align-items:center;justify-content:space-between;gap:20px;color:var(--seo-muted)}.seo-footer-nav{display:flex;flex-wrap:wrap;gap:14px}.seo-footer a{color:var(--seo-primary);text-decoration:none;font-weight:750}
.seo-route-landing{padding:24px;margin-bottom:22px;background:linear-gradient(135deg,#fff,#f3f7ff);border:1px solid var(--seo-line);border-radius:22px;box-shadow:var(--seo-shadow)}.seo-route-landing h1{margin:10px 0;font-size:clamp(28px,4.5vw,48px);line-height:1.1}.seo-route-landing>p{max-width:820px;color:var(--seo-muted);font-size:17px;line-height:1.7}.seo-route-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:20px}.seo-route-links a{display:flex;flex-direction:column;gap:5px;padding:15px;border:1px solid var(--seo-line);border-radius:15px;background:#fff;text-decoration:none}.seo-route-links strong{color:var(--seo-primary-dark)}.seo-route-links span{color:var(--seo-muted);font-size:13px;line-height:1.45}
@media(max-width:900px){
  .seo-site-header-inner{min-height:62px;padding:9px 14px;gap:10px}.seo-brand-copy small{display:none}.seo-header-search{max-width:none}.seo-shell{padding:16px 14px calc(48px + env(safe-area-inset-bottom))}.seo-entry-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.seo-detail-grid{grid-template-columns:1fr}.seo-route-links{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:620px){
  .seo-site-header{position:relative}.seo-site-header-inner{align-items:stretch;flex-wrap:wrap}.seo-brand{height:42px}.seo-header-search{order:2;flex-basis:100%;height:48px}.seo-header-search input{font-size:16px}.seo-shell{padding-left:12px;padding-right:12px}.seo-breadcrumbs{font-size:13px}.seo-hero-card,.seo-entry-card{padding:19px;border-radius:18px}.seo-hero-card h1{font-size:32px}.seo-hero-card p{font-size:15px}.seo-search-large{flex-direction:column}.seo-search-large button{width:100%}.seo-entry-grid{grid-template-columns:1fr;gap:10px}.seo-word-link{padding:15px}.seo-word-head strong{font-size:28px}.seo-section-title{align-items:flex-start;flex-direction:column}.seo-entry-heading{display:block}.seo-entry-hanzi{font-size:64px}.seo-entry-question{font-size:27px}.seo-definition{padding:17px}.seo-definition p{font-size:21px}.seo-actions>*{width:100%}.seo-route-links{grid-template-columns:1fr}.seo-footer-inner{align-items:flex-start;flex-direction:column}.seo-pagination a,.seo-pagination span{min-width:40px;min-height:40px}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation-duration:.01ms!important;transition-duration:.01ms!important}}

/* V4.3.0 — Mobile-first dictionary discovery and interaction refinements */
html{scroll-padding-top:76px}
body.seo-public-page{overscroll-behavior-y:contain;-webkit-tap-highlight-color:transparent}
.seo-topic-nav{display:flex;gap:8px;align-items:center;overflow-x:auto;padding:2px 1px 10px;scrollbar-width:thin;scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch}
.seo-topic-nav a{display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;min-height:44px;padding:9px 14px;border:1px solid var(--seo-line);border-radius:999px;background:#fff;color:var(--seo-primary-dark);font-size:14px;font-weight:850;text-decoration:none;scroll-snap-align:start}
.seo-topic-nav a:hover,.seo-topic-nav a:focus-visible{border-color:#8caee6;background:var(--seo-soft)}
.seo-topic-nav a.active,.seo-topic-nav a[aria-current="page"]{border-color:var(--seo-primary);background:var(--seo-primary);color:#fff}
.seo-topic-nav-spaced{margin:18px 0 4px}
.seo-entry-grid,.seo-related,.seo-detail-grid,.seo-route-links,.seo-pagination{content-visibility:auto;contain-intrinsic-size:auto 520px}
.seo-word-link,.seo-panel{contain:layout paint style}
.seo-header-search input,.seo-search-large input{touch-action:manipulation}
.seo-button,.seo-actions button,.seo-header-search button,.seo-search-large button,.seo-pagination a,.seo-topic-nav a{touch-action:manipulation}
.seo-share-status{min-height:20px;margin-top:8px;color:var(--seo-muted);font-size:13px}
.seo-entry-card :target{scroll-margin-top:86px}
@media(hover:none){.seo-word-link:hover{transform:none;box-shadow:none}.seo-button:hover,.seo-header-search button:hover,.seo-search-large button:hover{background:var(--seo-primary)}}
@media(max-width:620px){
  .seo-site-header{position:sticky;top:0}
  .seo-site-header-inner{min-height:56px;padding:7px max(10px,env(safe-area-inset-right)) 7px max(10px,env(safe-area-inset-left));align-items:center;flex-wrap:nowrap}
  .seo-brand{height:40px;min-width:auto;flex:0 0 auto}.seo-brand-mark{width:36px;height:36px;border-radius:11px}.seo-brand-copy{display:none}
  .seo-header-search{order:initial;flex-basis:auto;height:44px;min-width:0;border-radius:12px}.seo-header-search input{padding:10px 12px}.seo-header-search button{min-width:44px}
  .seo-shell{padding-top:12px;padding-bottom:calc(42px + env(safe-area-inset-bottom))}
  .seo-topic-nav{margin-left:-12px;margin-right:-12px;padding-left:12px;padding-right:12px}
  .seo-topic-nav a{min-height:44px;padding-inline:13px}
  .seo-entry-grid,.seo-related,.seo-detail-grid,.seo-route-links{contain-intrinsic-size:auto 720px}
  .seo-word-link{content-visibility:auto;contain-intrinsic-size:auto 150px}
  .seo-actions{display:grid;grid-template-columns:1fr}.seo-actions>*{width:100%;min-height:48px}
  .seo-footer-inner{padding-bottom:calc(28px + env(safe-area-inset-bottom))}
}

/* V4.4.0 — large-dictionary discovery, snippet clarity and crawl hubs */
.seo-directory-nav{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0;padding:14px;border:1px solid #dbe5f2;border-radius:18px;background:#fff}
.seo-directory-nav a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 15px;border-radius:999px;background:#eef4fb;color:#173d70;font-weight:800;text-decoration:none}
.seo-directory-nav a:hover,.seo-directory-nav a:focus-visible{background:#dfeafa;outline:none}
.seo-alpha-nav{display:grid;grid-template-columns:repeat(13,minmax(34px,1fr));gap:7px;margin:14px 0 22px}
.seo-alpha-nav a{display:flex;align-items:center;justify-content:center;min-height:38px;border:1px solid #d7e2f0;border-radius:10px;background:#fff;color:#24496f;text-decoration:none;font-weight:800}
.seo-alpha-nav a.active,.seo-alpha-nav a:hover{background:#173f73;color:#fff;border-color:#173f73}
.seo-page-landmarks{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;margin:12px 0 28px;color:#60748d;font-size:.9rem}
.seo-page-landmarks a{padding:7px 10px;border-radius:9px;background:#edf3fa;color:#174376;text-decoration:none;font-weight:700}
.seo-entry-answer{margin:0 0 18px;padding:16px 18px;border-left:5px solid #1971c2;border-radius:12px;background:#f0f7ff;color:#172b46;font-size:1.08rem;line-height:1.75}
.seo-entry-answer dfn{font-style:normal;font-weight:900;color:#c92a2a}
.seo-entry-answer span{color:#325f8f}
.seo-entry-context{margin-top:18px}
.seo-updated-note{font-size:.88rem;color:#718198;margin-bottom:0}
.seo-entry-sequence{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:18px 0}
.seo-entry-sequence>a{display:grid;gap:3px;padding:14px 16px;border:1px solid #dbe5f2;border-radius:16px;background:#fff;color:#173d70;text-decoration:none}
.seo-entry-sequence>a:last-child{text-align:right}
.seo-entry-sequence span{font-size:.82rem;color:#718198}.seo-entry-sequence strong{font-size:1.3rem}.seo-entry-sequence small{color:#466684}
.seo-directory-section{margin:26px 0}
.seo-letter-directory{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:12px}
.seo-letter-directory a,.seo-hsk-directory a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-height:88px;border:1px solid #dce6f2;border-radius:16px;background:#fff;color:#153f71;text-decoration:none;box-shadow:0 8px 22px rgba(16,45,80,.05)}
.seo-letter-directory strong{font-size:1.55rem}.seo-letter-directory span,.seo-hsk-directory span{color:#718198;font-size:.86rem}
.seo-directory-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.seo-directory-card{display:flex;align-items:center;gap:13px;padding:17px;border:1px solid #dce6f2;border-radius:17px;background:#fff;color:#163d69;text-decoration:none}
.seo-directory-icon{display:flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:14px;background:#eaf2fc;font-size:1.35rem}
.seo-directory-card span:last-child{display:grid;gap:3px}.seo-directory-card small{color:#718198}
.seo-hsk-directory{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:12px}
.seo-stat-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.seo-stat-row span{padding:10px 13px;border-radius:12px;background:rgba(255,255,255,.82);border:1px solid #dce6f2;color:#49627d}.seo-stat-row b{color:#153f71}
.seo-about-card{padding:30px;border:1px solid #dbe5f2;border-radius:24px;background:#fff;box-shadow:0 18px 50px rgba(20,47,80,.07)}
.seo-about-card h1{font-size:clamp(2rem,4vw,3.3rem);line-height:1.1;margin:8px 0 14px}.seo-about-card h2{margin-top:30px;color:#132f54}.seo-about-card p{line-height:1.8;color:#405873}.seo-lead{font-size:1.1rem}
.seo-source-list{display:grid;gap:14px}.seo-source-list article{padding:18px;border:1px solid #dbe5f2;border-radius:16px;background:#f8fbff}.seo-source-list h3{margin:0 0 8px;color:#173f73}
@media (max-width:900px){.seo-alpha-nav{grid-template-columns:repeat(9,minmax(34px,1fr))}.seo-letter-directory{grid-template-columns:repeat(4,minmax(0,1fr))}.seo-directory-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.seo-hsk-directory{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:620px){.seo-directory-nav{display:grid;grid-template-columns:1fr 1fr}.seo-directory-nav a{font-size:.88rem;padding:9px}.seo-alpha-nav{grid-template-columns:repeat(6,minmax(34px,1fr))}.seo-letter-directory{grid-template-columns:repeat(3,minmax(0,1fr))}.seo-directory-grid{grid-template-columns:1fr}.seo-entry-sequence{grid-template-columns:1fr}.seo-entry-sequence>a:last-child{text-align:left}.seo-about-card{padding:20px}.seo-stat-row{display:grid;grid-template-columns:1fr}.seo-hsk-directory{grid-template-columns:repeat(2,minmax(0,1fr))}}