:root{--paper:#EAF2F1;--sheet:#F8FCFB;--ink:#12292A;--muted:#58706F;--line:#CCDEDC;--aqua:#17757A;--aqua-soft:#D5ECEA;--rust:#B0502B;--gold:#8E7124;
--display:"Noto Serif Display","Noto Serif",Georgia,serif;--body:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--paper:#0E1819;--sheet:#152223;--ink:#E0EEEC;--muted:#97B0AE;--line:#27403F;--aqua:#6FC3C6;--aqua-soft:#1C3433;--rust:#E58C62;--gold:#D2B463;color-scheme:dark}}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.65 var(--body)}
.wrap{max-width:1100px;margin:0 auto;padding-inline:18px}
a{color:var(--aqua)}h1,h2,h3{font-family:var(--display);font-weight:600;line-height:1.2;text-wrap:balance;margin:0}
.label{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.label a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;color:inherit}button:focus-visible,input:focus-visible,a:focus-visible,select:focus-visible{outline:2px solid var(--aqua);outline-offset:2px}
header.top{background:var(--sheet);border-bottom:1px solid var(--line);padding:12px 0}
.brand{display:inline-block;font-family:var(--display);font-size:22px;color:var(--ink);text-decoration:none;margin:4px 0 2px}.brand span{color:var(--aqua);font-style:italic}
.nav{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:13.5px}.nav a{text-decoration:none;padding:2px 0}.nav a:hover{text-decoration:underline}
.mast{margin-top:16px;padding:34px 30px;min-height:270px;border-radius:20px;color:#fff;display:flex;flex-wrap:wrap;gap:18px;align-items:flex-end;justify-content:space-between;background:linear-gradient(90deg,rgba(4,20,14,.88) 0%,rgba(4,20,14,.62) 40%,rgba(4,20,14,.08) 78%),url("/thuy-sinh/wiki/banner.webp") center/cover no-repeat,#0c3a3e;overflow:hidden}
.mast h1{font-size:clamp(30px,6vw,52px);color:#fff}.mast h1 span{color:#BDF1EC;font-style:italic}.mast p{margin:8px 0 0;max-width:52ch;color:rgba(255,255,255,.9)}.mast .label{color:rgba(255,255,255,.8)}
.counts{display:flex;gap:18px;font-size:12px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);border-radius:14px;padding:10px 16px}.counts b{display:block;font-family:var(--display);font-size:26px}
.unlock-bar{margin:14px 0;padding:12px 16px;border:1px solid var(--line);background:var(--aqua-soft);border-radius:14px;display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;font-size:14px}
.unlock-bar p{margin:0}.unlock-bar.done{background:var(--sheet)}
.btn-unlock{background:var(--aqua);color:#fff;border:0;border-radius:999px;padding:9px 18px;font-weight:600}.btn-unlock:hover{filter:brightness(1.08)}
.finder{margin:14px 0}#q{width:100%;padding:13px 16px;font:inherit;border:1px solid var(--line);border-radius:14px;background:var(--sheet);color:var(--ink)}
.tabs{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0}.tabs button{border:1px solid var(--line);background:var(--sheet);border-radius:999px;padding:6px 12px;font-size:13px}
.tabs button[aria-pressed="true"]{background:var(--aqua);color:#fff;border-color:var(--aqua)}.tabs small{opacity:.7}
.result-note{font-size:13px;color:var(--muted);margin:6px 0}
.grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}@media(max-width:760px){.grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}}
.card{display:grid;gap:5px;text-decoration:none;color:inherit;background:var(--sheet);border:1px solid var(--line);border-radius:14px;padding:8px;transition:border-color .15s,transform .15s;align-content:start}
.card:hover{border-color:var(--aqua);transform:translateY(-2px)}.card img,.card .ph{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;border-radius:9px;background:var(--aqua-soft);display:grid;place-items:center;font-size:34px}
.card h3{font-size:15.5px;line-height:1.25}.card .s{font-family:var(--display);font-style:italic;font-size:12px;color:var(--muted);overflow-wrap:anywhere}.card .x{font-size:11.5px;color:var(--muted)}
.more{text-align:center;margin:14px 0}.more button{border:1px solid var(--aqua);background:var(--sheet);color:var(--aqua);border-radius:999px;padding:9px 22px;font-weight:600}
.toc-wrap{margin:30px 0}.toc-wrap h2{margin-bottom:8px}.toc{border-top:1px solid var(--line);padding:8px 0}.toc summary{cursor:pointer;font-family:var(--display);font-size:18px;padding:6px 0}
.toc-cols{columns:4 200px;column-gap:22px}.toc-cols a{display:block;font-size:13.5px;line-height:1.75;color:var(--ink);text-decoration:none}.toc-cols a:hover{color:var(--aqua);text-decoration:underline}
.article{padding-top:14px;padding-bottom:30px;max-width:900px}.crumb{font-size:13px;color:var(--muted);margin:8px 0 14px}.crumb a{color:var(--muted)}
.hero{display:grid;grid-template-columns:minmax(0,320px) 1fr;gap:20px;align-items:start;margin-bottom:16px}@media(max-width:700px){.hero{grid-template-columns:1fr}.mast{min-height:220px;padding:24px 18px}}
.hero-img img{width:100%;height:auto;aspect-ratio:4/3;border-radius:14px;border:1px solid var(--line);display:block;background:var(--aqua-soft)}.hero-img{margin:0}.hero-img.noimg{aspect-ratio:4/3;border-radius:14px;background:var(--aqua-soft);display:grid;place-items:center;font-size:60px}
.credit{font-size:10.5px;color:var(--muted);margin-top:3px}
h1{font-size:clamp(26px,4.5vw,38px)}.sci{font-family:var(--display);font-style:italic;color:var(--muted);font-size:17px;margin-top:4px}.aka{font-size:14px;color:var(--muted);margin-top:4px}
.tags{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0}.tags span{font-size:12px;background:var(--aqua-soft);border-radius:999px;padding:3px 10px}
.buy{margin-top:8px}.buy-main{display:inline-block;background:var(--aqua);color:#fff;text-decoration:none;border-radius:999px;padding:8px 16px;font-weight:600;font-size:14px}
.shop-links{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.shop-links:empty{display:none}.shop-links a{font-size:12.5px;border:1px solid var(--aqua);border-radius:999px;padding:3px 10px;text-decoration:none;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:14px 0}
.facts>div{background:var(--sheet);padding:9px 12px}.facts dt{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}.facts dd{margin:2px 0 0;font-size:14px}.facts small{color:var(--muted)}
.sec{margin:20px 0}.sec h2{font-size:21px;margin-bottom:8px}.sec p{margin:0}.lead{font-size:17px;color:var(--ink)}.note{margin-top:10px;font-size:14px;color:var(--muted)}
.legal{margin:16px 0;padding:12px 14px;border-left:4px solid var(--rust);background:var(--sheet);border-radius:8px;font-size:14px}
.chips{display:flex;flex-wrap:wrap;gap:6px}.chips a{font-size:13px;padding:4px 11px;border:1px solid var(--line);border-radius:999px;background:var(--sheet);text-decoration:none}.chips a:hover{border-color:var(--aqua)}
.mute{color:var(--muted);font-size:13px;margin-top:10px}
.lock-card{display:none;text-align:center;padding:18px;border:1px dashed var(--aqua);border-radius:14px;background:var(--aqua-soft);margin-top:12px}
.bk-locked .lock-card{display:block}.lock-ico{font-size:28px}.lock-card h3{font-size:18px;margin:4px 0}.lock-card p{margin:4px 0 10px;font-size:14px}
.bk-locked .paywall{max-height:120px;overflow:hidden;filter:blur(5px);user-select:none;pointer-events:none}
.lead-bd{position:fixed;inset:0;z-index:60;background:rgba(8,20,22,.55);display:grid;place-items:center;padding:16px}.lead-bd[hidden]{display:none}
.lead{position:relative;background:var(--sheet);border-radius:18px;padding:22px;max-width:440px;width:100%;display:grid;gap:10px;max-height:92vh;overflow:auto}
.lead .x{position:absolute;top:10px;right:12px;border:0;background:none;font-size:20px}.lead h2{font-size:22px}.lead .perks{margin:0;padding-left:18px;font-size:14px}
.lead label{display:grid;gap:4px;font-size:14px}.lead input[type=text]{padding:10px 12px;border:1px solid var(--line);border-radius:10px;font:inherit;background:var(--paper);color:var(--ink)}
.lead .consent{display:flex;gap:8px;font-size:12.5px;color:var(--muted)}.lead .hp{position:absolute;left:-9999px}.lead .err{color:var(--rust);font-size:13px;min-height:1em}.req{color:var(--rust)}
.foot{border-top:1px solid var(--line);margin-top:30px;padding:18px 0 30px;font-size:13px;color:var(--muted)}.foot a{color:var(--muted)}
.wiki-switch{display:flex;gap:8px;margin:12px 0 4px}.wiki-switch a{flex:1 1 0;text-align:center;text-decoration:none;padding:10px 14px;border-radius:14px;border:1px solid var(--line);background:var(--sheet);color:var(--ink);font-weight:600;font-size:14.5px;transition:border-color .15s,transform .15s}
.wiki-switch a:hover{border-color:var(--aqua);transform:translateY(-1px)}.wiki-switch a.on{background:var(--aqua);color:#fff;border-color:var(--aqua)}
@media(max-width:480px){.wiki-switch a{font-size:13px;padding:9px 8px}}
.mast{position:relative}.mast .bn-credit{position:absolute;right:12px;bottom:6px;font-size:10px;color:rgba(255,255,255,.7)}.mast .bn-credit a{color:inherit}
.pager{display:flex;flex-wrap:wrap;justify-content:center;gap:6px;margin:18px 0}.pager button{min-width:38px;height:38px;border:1px solid var(--line);background:var(--sheet);border-radius:10px;font-weight:600;color:var(--ink)}
.pager button[aria-current="page"]{background:var(--aqua);color:#fff;border-color:var(--aqua)}.pager button:hover{border-color:var(--aqua)}.pager .gap{align-self:center;color:var(--muted)}