:root{--bg: #fffdf8;--bg-2: #fff6e9;--surface: #ffffff;--border: #f1e4d3;--text: #2b2a33;--muted: #6b6878;--red: #e0453a;--red-2: #c3352b;--red-soft: #fdeceb;--gold: #f5b400;--gold-soft: #fff3c7;--green: #1f9d6a;--green-soft: #e3f6ee;--blue: #2f6fed;--blue-soft: #e8efff;--purple: #7b5be6;--purple-soft: #efeaff;--radius: 16px;--shadow: 0 6px 24px rgba(80, 50, 20, .08);--font: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", Arial, sans-serif;--hanzi: "Noto Sans SC", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", "SimHei", sans-serif;--l1: #1f9d6a;--l2: #2f6fed;--l3: #7b5be6;--l4: #e07a1f;--l5: #e0453a;--l6: #6b2d5c}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.6}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3,h4{line-height:1.25;margin:0 0 .5em;font-weight:800;letter-spacing:-.01em}h1{font-size:clamp(1.7rem,3.5vw,2.5rem)}h2{font-size:1.45rem}h3{font-size:1.1rem}p{margin:0 0 1em}.hz{font-family:var(--hanzi)}.container{max-width:1100px;margin:0 auto;padding:0 20px}.narrow{max-width:820px}.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20}.site-header .container{display:flex;align-items:center;gap:18px;min-height:64px;padding-top:8px;padding-bottom:8px}.logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:1.25rem;color:var(--text)}.logo:hover{text-decoration:none}.logo .mark{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--red),var(--gold));color:#fff;display:grid;place-items:center;font-family:var(--hanzi);font-weight:700;font-size:1.1rem}.nav{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap;min-width:0}.nav a{padding:7px 12px;border-radius:999px;color:var(--muted);font-weight:600;font-size:.95rem}.nav a:hover,.nav a[aria-current=page]{background:var(--red-soft);color:var(--red);text-decoration:none}.search-mini{display:flex;align-items:center;gap:8px}.search-mini input{border:1px solid var(--border);border-radius:999px;padding:8px 14px;font:inherit;width:200px;background:var(--bg-2)}@media (max-width: 760px){.search-mini{display:none}.nav a{padding:6px 9px;font-size:.88rem}}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:999px;border:2px solid transparent;cursor:pointer;font:inherit;font-weight:700}.btn:hover{text-decoration:none;filter:brightness(.97)}.btn.primary{background:var(--red);color:#fff}.btn.secondary{background:var(--gold-soft);color:#8a5a00}.btn.outline{background:#fff;border-color:var(--border);color:var(--text)}.btn.sm{padding:6px 12px;font-size:.9rem}.btn:disabled{opacity:.5;cursor:not-allowed}.badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:999px;font-size:.78rem;font-weight:700;background:var(--bg-2);color:var(--muted)}.badge.lvl-1{background:var(--green-soft);color:var(--l1)}.badge.lvl-2{background:var(--blue-soft);color:var(--l2)}.badge.lvl-3{background:var(--purple-soft);color:var(--l3)}.badge.lvl-4{background:#fff0e0;color:var(--l4)}.badge.lvl-5{background:var(--red-soft);color:var(--l5)}.badge.lvl-6{background:#f6e6f1;color:var(--l6)}.badge.pos{background:var(--gold-soft);color:#8a5a00}.hero{padding:56px 0 36px;text-align:center;background:radial-gradient(1200px 400px at 50% -100px,#ffe9c9 0%,transparent 70%)}.hero p.lead{color:var(--muted);font-size:1.15rem;max-width:720px;margin:0 auto 22px}.hero .search-big{max-width:620px;margin:0 auto;display:flex;gap:8px}.hero .search-big input{flex:1;font:inherit;font-size:1.05rem;padding:14px 18px;border-radius:999px;border:2px solid var(--border);background:#fff;box-shadow:var(--shadow)}.hero .search-big 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a{margin-left:auto;font-weight:600;font-size:.95rem}.word-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px}.word-row{display:flex;align-items:center;gap:12px;padding:10px 14px;background:var(--surface);border:1px solid var(--border);border-radius:12px;color:var(--text)}.word-row:hover{text-decoration:none;border-color:var(--red);background:#fffaf5}.word-row .hz{font-size:1.5rem;font-weight:700;min-width:2.2em}.word-row .py{color:var(--red);font-weight:600;font-size:.9rem}.word-row .vi{color:var(--muted);font-size:.9rem;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.word-row .meta{display:flex;flex-direction:column;min-width:0}.word-hero{background:var(--surface);border:1px solid var(--border);border-radius:24px;padding:28px;box-shadow:var(--shadow);display:grid;grid-template-columns:auto 1fr;gap:28px;align-items:center}@media (max-width: 640px){.word-hero{grid-template-columns:1fr;text-align:center}}.word-hero .hanzi{font-family:var(--hanzi);font-size:clamp(3.5rem,9vw,6rem);font-weight:700;line-height:1;color:var(--text)}.word-hero .pinyin{font-size:1.6rem;color:var(--red);font-weight:700}.word-hero .hanviet{color:var(--muted);font-style:italic}.word-hero .vi{font-size:1.35rem;font-weight:700;margin:8px 0}.word-hero .tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.speak{border:2px solid var(--border);background:#fff;border-radius:999px;padding:6px 12px;cursor:pointer;font:inherit;font-weight:700;color:var(--red);display:inline-flex;align-items:center;gap:6px}.speak:hover{border-color:var(--red)}.examples{display:grid;gap:12px}.example{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:14px 18px}.example .zh{font-family:var(--hanzi);font-size:1.35rem;font-weight:600}.example .py{color:var(--red);font-size:.95rem}.example .vi{color:var(--muted)}.note-box{background:var(--gold-soft);border-left:5px solid var(--gold);border-radius:10px;padding:12px 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0}.affil{display:flex;gap:12px;align-items:center;padding:10px;border-radius:12px;border:1px solid var(--border);background:#fff;color:var(--text)}.affil:hover{border-color:var(--gold);text-decoration:none}.affil .icon{width:44px;height:44px;border-radius:10px;background:var(--gold-soft);display:grid;place-items:center;font-size:1.4rem}.affil small{color:var(--muted);display:block}.deck{max-width:560px;margin:0 auto}.flash{perspective:1200px;height:300px;cursor:pointer}.flash .inner{position:relative;width:100%;height:100%;transition:transform .5s;transform-style:preserve-3d}.flash.flipped .inner{transform:rotateY(180deg)}.flash .face{position:absolute;inset:0;backface-visibility:hidden;background:var(--surface);border:2px solid var(--border);border-radius:24px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:20px;box-shadow:var(--shadow);text-align:center}.flash .back{transform:rotateY(180deg);background:var(--gold-soft)}.flash .hanzi{font-family:var(--hanzi);font-size:4rem;font-weight:700}.flash .pinyin{color:var(--red);font-size:1.4rem;font-weight:700}.flash .vi{font-size:1.3rem;font-weight:700}.flash .ex{color:var(--muted);font-size:.95rem}.deck-controls{display:flex;gap:10px;justify-content:center;margin-top:16px;flex-wrap:wrap}.deck-stats{display:flex;justify-content:center;gap:18px;color:var(--muted);margin-top:12px;font-size:.95rem}.quiz-opt{display:block;width:100%;text-align:left;font:inherit;padding:12px 16px;border-radius:12px;border:2px solid var(--border);background:#fff;margin-top:8px;cursor:pointer;font-size:1.05rem}.quiz-opt:hover{border-color:var(--red)}.quiz-opt.right{border-color:var(--green);background:var(--green-soft)}.quiz-opt.wrong{border-color:var(--red);background:var(--red-soft)}.tabs{display:flex;gap:6px;justify-content:center;margin-bottom:18px}.tabs button{font:inherit;font-weight:700;padding:8px 16px;border-radius:999px;border:2px solid var(--border);background:#fff;cursor:pointer}.tabs button.active{background:var(--red);color:#fff;border-color:var(--red)}.results{display:grid;gap:8px;margin-top:16px}.prose{max-width:760px}.prose h2{margin-top:1.6em}.prose img{max-width:100%;border-radius:12px}.prose table{border-collapse:collapse;width:100%;font-size:.95rem}.prose th,.prose td{border:1px solid var(--border);padding:8px 10px;text-align:left}.prose th{background:var(--bg-2)}.prose blockquote{border-left:4px solid var(--gold);margin:0;padding:4px 16px;color:var(--muted);background:var(--gold-soft);border-radius:0 10px 10px 0}.prose li{margin-bottom:6px}.toc{background:var(--bg-2);border-radius:12px;padding:12px 18px;font-size:.95rem}.article-meta{color:var(--muted);font-size:.9rem}.site-footer{border-top:1px solid var(--border);background:var(--surface);padding:32px 0;margin-top:48px;color:var(--muted);font-size:.92rem}.site-footer .container{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}@media (max-width: 700px){.site-footer .container{grid-template-columns:1fr}}.site-footer h4{margin-bottom:8px;color:var(--text)}.site-footer a{color:var(--muted);display:block;padding:2px 0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}.pill-list{display:flex;flex-wrap:wrap;gap:8px}.pill-list a{background:var(--surface);border:1px solid var(--border);border-radius:999px;padding:6px 12px;color:var(--text);font-size:.92rem}.pill-list a:hover{border-color:var(--red);text-decoration:none}.kpi{display:flex;gap:22px;justify-content:center;flex-wrap:wrap;margin-top:18px;color:var(--muted);font-size:.95rem}.kpi b{color:var(--text);font-size:1.3rem;display:block}.badge.b30{background:#e6f7ef;color:#0f7a52;border:1px solid #b6e7d1}.badge small{font-weight:600}.cross-table td.hi{background:var(--gold-soft);font-weight:700}.cross-table td{text-align:center}.cross-table th:first-child,.cross-table td:first-child{text-align:left;font-weight:700}.ff-head{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.ff-hz{font-size:2.4rem;font-weight:700;line-height:1}.ff-head .py{color:var(--red);font-weight:700;font-size:1.05rem}.ff-hv{color:var(--muted);font-size:.92rem;margin-top:2px}.ff-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}@media (max-width: 560px){.ff-grid{grid-template-columns:1fr}}.ff-wrong,.ff-right{padding:10px 12px;border-radius:10px;font-weight:600}.ff-wrong{background:#fdeceb;color:#a3231a}.ff-right{background:#e3f6ee;color:#0f7a52}.ff-wrong small,.ff-right small{display:block;font-weight:700;opacity:.8;font-size:.8rem;text-transform:uppercase;letter-spacing:.03em;margin-bottom:3px}@media (max-width: 900px){.site-header .container{flex-wrap:wrap;gap:10px;padding-top:10px;padding-bottom:6px}.logo{font-size:1.15rem}.nav{order:3;width:100%;margin-left:0;flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding-bottom:4px;-webkit-mask-image:linear-gradient(to right,#000 calc(100% - 24px),transparent 100%);mask-image:linear-gradient(to right,#000 calc(100% - 24px),transparent 100%)}.nav::-webkit-scrollbar{display:none}.nav a{white-space:nowrap;padding:8px 12px;font-size:.9rem}.nav a:last-child{margin-right:20px}}@media (hover: none) and (pointer: coarse){.nav a,.pill-list a,.site-footer a{min-height:40px;display:inline-flex;align-items:center}.crumbs a{padding:4px 0;display:inline-block}.badge{min-height:26px}.word-row{min-height:52px}}.prose table{display:block;overflow-x:auto;white-space:nowrap;max-width:100%}.prose table td,.prose table th{white-space:normal;min-width:90px}@media (max-width: 560px){.word-hero{padding:20px}.kpi{gap:14px;font-size:.9rem}.section{padding:24px 0}h1{font-size:1.5rem}}.cl-box{background:var(--blue-soft);border-left:5px solid var(--blue);border-radius:10px;padding:12px 16px;margin-top:12px}.cl-item{display:inline-flex;align-items:baseline;gap:4px;background:#fff;border:1px solid var(--border);border-radius:8px;padding:3px 10px;margin-left:8px;color:var(--text)}.cl-item:hover{border-color:var(--blue);text-decoration:none}.cl-item .hz{font-size:1.3rem;font-weight:700}.cl-item small{color:var(--muted)}.cl-eg{margin-top:8px;font-size:.93rem;color:var(--muted)}.cl-eg .hz{font-size:1.15rem;color:var(--text);font-weight:600}.cl-wrong{text-decoration:line-through;color:var(--err)!important;font-weight:400!important}.decomp{display:flex;align-items:center;gap:10px;flex-wrap:wrap;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:16px 18px}.decomp-main{font-size:2.6rem;font-weight:700}.decomp-eq,.decomp-plus{color:var(--muted);font-size:1.4rem}.decomp-part{display:flex;flex-direction:column;align-items:center;padding:8px 14px;background:var(--bg-2);border:1px solid var(--border);border-radius:10px;color:var(--text)}.decomp-part:hover{border-color:var(--red);text-decoration:none}.decomp-part .hz{font-size:2rem;font-weight:700;line-height:1.1}.decomp-part small{color:var(--muted);font-size:.8rem}