.mk h3{margin:14px 0 6px}.mk-sub{color:var(--muted);margin:4px 0 8px}.mk-note{color:var(--muted);font-size:.92em;margin-top:12px}.mk-n{font-weight:400;color:var(--muted);font-size:.6em}
.mk-chain{list-style:none;padding:0;margin:8px 0;display:flex;flex-wrap:wrap;gap:8px;align-items:stretch;counter-reset:mk}
.mk-chain li{counter-increment:mk;position:relative;background:var(--soft2);border:1px solid var(--line);border-radius:12px;padding:8px 12px 8px 34px;min-width:min(100%,180px);flex:1 1 180px}
.mk-chain li::before{content:counter(mk);position:absolute;left:10px;top:8px;width:18px;height:18px;border-radius:50%;background:var(--accent2);color:#fff;font-size:.75em;display:grid;place-items:center}
.mk-lops{display:grid;gap:10px}.mk-lop-h{font-weight:700;margin:6px 0}.mk-arrow{font-weight:400;color:var(--muted)}.mk-nav{display:flex;flex-direction:column;gap:2px;margin-top:6px;color:var(--muted);font-size:.8em}.mk-book{opacity:.85}
.mk-chain li b{display:block;font-size:.85em;color:var(--muted)}.mk-chain li span{display:block}
.mk-chips{display:flex;flex-wrap:wrap;gap:8px}.mk-chip{display:inline-block;padding:6px 12px;border-radius:999px;background:var(--soft);border:1px solid var(--line);color:var(--ink);text-decoration:none}.mk-chip:hover{border-color:var(--accent)}.mk-chip.off{opacity:.65}
.mk-cta{margin-top:16px}

:root{--bg:#fffaf3;--card:#fff;--ink:#2b2a33;--muted:#6b6878;--line:#efe6d8;--accent:#ff7a45;--accent2:#2bb5a0;--soft:#fff1e6;--soft2:#e7f7f4;--good:#1f9d55;--bad:#d64545;--r:18px}
@media (prefers-color-scheme:dark){:root{--bg:#17161c;--card:#211f28;--ink:#f1eef7;--muted:#a9a4b8;--line:#332f3d;--soft:#3a2a22;--soft2:#1d3532}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 "Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:inherit}
.wrap{max-width:860px;margin:0 auto;padding:0 18px}
header.top{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
header.top .wrap{display:flex;align-items:center;gap:12px;height:58px}
.logo{font-weight:800;text-decoration:none;font-size:19px;letter-spacing:-.3px}.logo span{color:var(--accent)}
.crumbs{font-size:14px;color:var(--muted);margin:18px 0 4px}.crumbs a{color:var(--muted)}
h1{font-size:clamp(26px,5.5vw,40px);line-height:1.2;letter-spacing:-.5px;margin:10px 0 8px}
h2{font-size:clamp(20px,4vw,26px);margin:34px 0 12px}
h3{font-size:18px;margin:0 0 6px}
.lead{font-size:clamp(17px,2.6vw,20px);color:var(--muted);margin:0 0 18px}
.hero{padding:34px 0 10px}
.hero .badge{display:inline-block;background:var(--soft2);color:var(--accent2);font-weight:700;font-size:13px;padding:4px 12px;border-radius:99px}
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(min(100%,240px),1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px 18px 16px;text-decoration:none;display:block;transition:transform .15s,box-shadow .15s}
a.card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.06)}
.card .em{font-size:30px;line-height:1}.card .kind{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.6px;color:var(--accent2)}
.card p{margin:6px 0 0;color:var(--muted);font-size:15px}
.card.off{opacity:.55}
.pill{display:inline-block;font-size:13px;background:var(--soft);padding:3px 10px;border-radius:99px;margin-right:6px}
.box{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px 20px;margin:14px 0}
.box.idea{background:var(--soft);border-color:transparent;font-size:clamp(18px,2.8vw,21px);font-weight:600}
.groups{display:grid;gap:10px;grid-template-columns:repeat(auto-fill,minmax(min(100%,200px),1fr))}
.group{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 14px}.group b{display:block}.group small{color:var(--muted)}
.real{background:var(--soft2);border-radius:14px;padding:12px 16px;margin-top:10px;font-size:15.5px}
.real:before{content:"🌏 Liên hệ thực tế";display:block;font-weight:700;font-size:13px;color:var(--accent2);margin-bottom:2px}
ul.clean{list-style:none;padding:0;margin:0}ul.clean li{padding:8px 0;border-bottom:1px dashed var(--line)}ul.clean li:last-child{border:0}
.quiz .q{margin:0 0 18px}.quiz .q p{font-weight:600;margin:0 0 8px}
.quiz button{display:block;width:100%;text-align:left;font:inherit;font-size:16px;background:var(--card);color:var(--ink);border:2px solid var(--line);border-radius:12px;padding:10px 14px;margin:6px 0;cursor:pointer}
.quiz button:hover{border-color:var(--accent)}
.quiz button.ok{border-color:var(--good);background:color-mix(in srgb,var(--good) 12%,var(--card))}
.quiz button.no{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 10%,var(--card))}
.quiz .why{display:none;font-size:15px;color:var(--muted);margin-top:6px}.quiz .q.done .why{display:block}
.score{font-weight:700;color:var(--accent)}
.parents{border:2px solid var(--accent);background:var(--card)}
.parents h2{margin-top:0}
.ref{font-size:14px;color:var(--muted)}
.ad{margin:24px 0;min-height:90px;border:1px dashed var(--line);border-radius:12px}
footer{margin:50px 0 30px;padding-top:18px;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}
.next{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}.next a{flex:1 1 220px}

.lvlbadge{font:700 12px Inter,sans-serif;padding:3px 8px;border-radius:6px}
.level-h{display:flex;align-items:baseline;gap:10px}.level-h small{color:var(--muted);font-size:14px;font-weight:400}
details.parents-fold{margin-top:14px}details.parents-fold summary{cursor:pointer;font-weight:700}
/* THCS: hiện đại, tím chàm */
body.lvl-cs{--bg:#f4f6ff;--card:#fff;--ink:#141a33;--muted:#5d6488;--line:#e1e5fb;--accent:#4f46e5;--accent2:#0ea5e9;--soft:#eef0ff;--soft2:#eef9ff;--r:14px;font-family:Inter,system-ui,sans-serif;font-size:16px}
.lvl-cs h1{letter-spacing:-1px}.lvl-cs .lvlbadge{background:#141a33;color:#c7f36b}
.lvl-cs .box.idea{background:var(--card);border-left:4px solid var(--accent);border-radius:0 12px 12px 0}
.lvl-cs .pill{background:transparent;border:1.5px solid #c7cdf5;color:var(--accent);font-weight:600;border-radius:8px}
.lvl-cs .card .em{display:none}.lvl-cs .card{border-radius:14px}.lvl-cs a.card:hover{border-color:var(--accent)}
.lvl-cs .quiz button{border-width:1.5px;border-radius:10px;background:#fafbff}
.lvl-cs .parents{border:1px solid var(--line)}
@media (prefers-color-scheme:dark){body.lvl-cs{--bg:#12142a;--card:#1b1e3a;--ink:#eef0ff;--muted:#a6abd0;--line:#2c3060;--soft:#22264a;--soft2:#17304a}}
/* THPT: học thuật, serif */
body.lvl-pt{--bg:#fbfaf7;--card:#fff;--ink:#1d1d1f;--muted:#6b6a66;--line:#e3e1da;--accent:#9a3412;--accent2:#9a3412;--soft:#f3efe6;--soft2:#f3efe6;--r:2px;font-family:Inter,system-ui,sans-serif;font-size:16px}
.lvl-pt h1,.lvl-pt h2{font-family:Lora,Georgia,serif}.lvl-pt h2{border-bottom:1px solid var(--line);padding-bottom:6px}
.lvl-pt header.top{border-bottom:1px solid var(--ink)}.lvl-pt .logo{font-family:Lora,serif}.lvl-pt .lvlbadge{border:1px solid var(--ink)}
.lvl-pt .box.idea{background:var(--card);border:1px solid var(--ink);font-weight:500}
.lvl-pt .pill{background:transparent;border-radius:0;font:500 12px "JetBrains Mono",monospace;text-transform:uppercase;color:var(--muted);padding:0;margin-right:12px}
.lvl-pt .card .em{display:none}.lvl-pt .card,.lvl-pt .box,.lvl-pt .quiz button{border-radius:2px}
.lvl-pt .real{border-left:3px solid var(--accent);border-radius:0}
.lvl-pt .parents{border:1px solid var(--line)}
@media (prefers-color-scheme:dark){body.lvl-pt{--bg:#18171a;--card:#212024;--ink:#efece6;--muted:#a8a49c;--line:#34323a;--soft:#2a2620;--soft2:#2a2620}}

/* HOME_V2 — premium, dễ tiếp cận */
body.lvl-home{--bg:#fbfaf8;--card:#fff;--ink:#14131a;--muted:#5f5d6b;--line:#ebe8e2;--accent:#5b4bff;--accent2:#00b38f;--soft:#f1efff;font-family:Inter,"Be Vietnam Pro",system-ui,sans-serif}
.lvl-home .wrap{max-width:1120px}
.lvl-home .logo span{color:var(--accent)}
.h-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--accent);background:var(--soft);padding:6px 12px;border-radius:99px}
.h-eyebrow i{width:7px;height:7px;border-radius:50%;background:var(--accent2);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent2) 25%,transparent)}
.h-hero{display:grid;grid-template-columns:1.15fr 1fr;gap:48px;align-items:center;padding:64px 0 40px}
@media(max-width:860px){.h-hero{grid-template-columns:1fr;gap:32px;padding-top:36px}}
.h-hero h1{font-size:clamp(36px,6vw,64px);line-height:1.05;letter-spacing:-2px;margin:18px 0}
.h-hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--accent),#b04bff 60%,var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.h-lead{font-size:clamp(17px,2vw,19px);color:var(--muted);max-width:560px;margin:0 0 26px}
.h-cta{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;text-decoration:none;font-weight:700;font-size:16px;padding:14px 22px;border-radius:12px;transition:transform .15s}
.btn:hover{transform:translateY(-2px)}
.btn.pri{background:var(--ink);color:#fff;box-shadow:0 10px 30px -10px rgba(20,19,26,.5)}
.btn.ghost{border:1.5px solid var(--line);background:var(--card)}
.h-trust{display:flex;gap:22px;flex-wrap:wrap;margin-top:26px;font-size:14px;color:var(--muted)}.h-trust b{color:var(--ink);font-size:18px;margin-right:4px}
.h-demo{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:18px;box-shadow:0 30px 80px -30px rgba(91,75,255,.35),0 2px 0 rgba(0,0,0,.02);position:relative}
.h-demo:before{content:"";position:absolute;inset:-40px -20px auto auto;width:200px;height:200px;background:radial-gradient(circle,color-mix(in srgb,var(--accent) 30%,transparent),transparent 70%);z-index:-1}
.chat-top{display:flex;align-items:center;gap:8px;font-weight:700;font-size:14px;padding-bottom:12px;border-bottom:1px solid var(--line);margin-bottom:14px}
.chat-top .dot{width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2))}
.chat-top .tag{margin-left:auto;font-size:11px;font-weight:700;color:var(--muted);border:1px solid var(--line);padding:2px 8px;border-radius:99px}
.msg{max-width:88%;padding:11px 14px;border-radius:16px;margin:8px 0;font-size:15px;line-height:1.55}
.msg.me{margin-left:auto;background:var(--ink);color:#fff;border-bottom-right-radius:4px}
.msg.ai{background:var(--soft);border-bottom-left-radius:4px}.msg .src{font-size:12px;color:var(--accent);font-weight:600;margin-top:6px}
.msg-link{display:inline-block;font-size:14px;font-weight:700;color:var(--accent);text-decoration:none;margin:2px 0 10px}
.chat-in{display:flex;justify-content:space-between;align-items:center;border:1.5px solid var(--line);border-radius:14px;padding:12px 14px;color:var(--muted);font-size:14px}
.chat-in span{background:var(--accent);color:#fff;width:28px;height:28px;border-radius:9px;display:grid;place-items:center}
.h-sec{padding:44px 0}.h-head{margin-bottom:22px}.h-head h2{font-size:clamp(26px,4vw,38px);letter-spacing:-1px;margin:14px 0 0;line-height:1.15}
.feat{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr))}
.f{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:22px;position:relative}
.f-ico{width:46px;height:46px;border-radius:14px;background:var(--soft);display:grid;place-items:center;font-size:22px;margin-bottom:14px}
.f h3{font-size:17px;margin:0 0 6px}.f p{margin:0;color:var(--muted);font-size:15px}
.st{display:inline-block;margin-top:14px;font-size:12px;font-weight:700;padding:3px 10px;border-radius:99px}
.st.soon{background:#fff4e0;color:#a15c00}.st.on{background:#dcf7ee;color:#007a5e}
.lvs{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr))}
.lv{border-radius:22px;padding:24px;border:1px solid var(--line);background:var(--card)}
.lv-th{background:linear-gradient(160deg,#fff4ea,#fff)}.lv-cs{background:linear-gradient(160deg,#eef0ff,#fff)}.lv-pt{background:linear-gradient(160deg,#f6f1e7,#fff)}
.lv-ico{font-size:30px}.lv-t{font-size:22px;font-weight:800;margin:10px 0 4px}.lv-t small{font-size:14px;font-weight:500;color:var(--muted)}
.lv p{color:var(--muted);margin:0 0 16px;font-size:15px}
.lv-links{display:flex;gap:8px;flex-wrap:wrap}.lv-links a{background:var(--ink);color:#fff;text-decoration:none;font-weight:700;font-size:14px;padding:8px 14px;border-radius:10px}
.lv-links .soon{font-size:14px;color:var(--muted);border:1px dashed var(--line);padding:7px 12px;border-radius:10px}
.steps3{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr))}
.steps3 div{border-top:2px solid var(--ink);padding-top:14px}.steps3 b{font-size:13px;color:var(--accent)}.steps3 h3{margin:6px 0 4px;font-size:20px}.steps3 p{margin:0;color:var(--muted)}
.h-band{margin:30px 0 10px;background:var(--ink);color:#fff;border-radius:28px;padding:44px 32px;text-align:center}
.h-band h2{font-size:clamp(24px,4vw,36px);margin:0 0 8px;letter-spacing:-1px}.h-band p{color:#c9c7d6;margin:0 0 22px}.h-band .btn.pri{background:#fff;color:var(--ink)}
@media (prefers-color-scheme:dark){body.lvl-home{--bg:#0f0e14;--card:#18171f;--ink:#f3f2f8;--muted:#a3a1b3;--line:#2a2833;--soft:#211e3a}
.lvl-home .btn.pri{background:#fff;color:#14131a}.msg.me{background:#2e2b45}.lv-th,.lv-cs,.lv-pt{background:var(--card)}.lv-links a{background:#fff;color:#14131a}.h-band{background:#211e3a}}

/* SKETCH_PATCH — tiểu học: sách tranh vẽ tay */
body.lvl-th .prog{display:flex;gap:6px;margin:4px 0 14px}body.lvl-th .prog i{flex:1;height:10px;border-radius:9px;background:#e9dcc0;border:1.5px solid var(--ink)}body.lvl-th .prog i.d{background:var(--sun)}
body.lvl-th .nextq{display:block;margin:12px 0;min-height:48px;padding:8px 18px;font:800 17px Nunito;border:2.5px solid var(--ink);background:var(--sun);color:var(--ink);border-radius:255px 18px 225px 18px/18px 225px 18px 255px;box-shadow:3px 4px 0 var(--ink);cursor:pointer}
body.lvl-th .nextq[hidden],body.lvl-th .q[hidden]{display:none}
body.lvl-th .sticker{font-size:64px;text-align:center;animation:pop .6s}@keyframes pop{0%{transform:scale(0) rotate(-30deg)}80%{transform:scale(1.2)}}
body.lvl-th .th-hero{display:grid;gap:16px;align-items:center;margin:14px 0 22px}
body.lvl-th .th-hero h1{font-size:clamp(30px,7vw,48px)}body.lvl-th .th-hero h1 span{color:var(--orange)}
body.lvl-th .th-hero .pic{padding:8px;transform:rotate(-1deg);border:2.5px solid var(--ink);border-radius:255px 18px 225px 18px/18px 225px 18px 255px;background:#fffdf7;box-shadow:4px 5px 0 #3b2f2a22}
body.lvl-th .th-hero img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;border-radius:10px}
body.lvl-th .note{font-size:15px;color:var(--muted)}
body.lvl-th .grades5{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(min(100%,140px),1fr));margin:10px 0 22px}
body.lvl-th .g5{display:block;text-align:center;padding:16px 10px;border:2.5px solid var(--ink);border-radius:255px 18px 225px 18px/18px 225px 18px 255px;box-shadow:4px 5px 0 #3b2f2a22;color:var(--ink);text-decoration:none;transition:transform .15s}
body.lvl-th a.g5:hover{transform:rotate(-1.5deg) scale(1.03)}body.lvl-th .g5.off{opacity:.55}
body.lvl-th .g5 small{display:block;color:var(--muted)}body.lvl-th .g5 b{display:block;font:800 52px/1 "Baloo 2"}
body.lvl-th .g5 .tag{display:inline-block;margin-top:6px;font-size:13px;font-weight:800;padding:2px 10px;border-radius:99px;background:var(--mint2);border:1.5px solid var(--ink)}body.lvl-th .g5.off .tag{background:#eee4d0}
body.lvl-th .c1{background:var(--berry2)}body.lvl-th .c2{background:var(--sky2)}body.lvl-th .c3{background:var(--mint2)}body.lvl-th .c4{background:var(--orange2)}body.lvl-th .c5{background:#efe2ff}
@media(min-width:860px){body.lvl-th .th-hero{grid-template-columns:1fr 1.1fr}}
body.lvl-th{--paper:#fbf4e4;--paper2:#f4e8cc;--ink:#3b2f2a;--muted:#7a6a5c;--orange:#ef8a4c;--orange2:#fde1c8;--mint2:#dff3e8;--sky2:#dcefff;--berry2:#fde0e6;--sun:#f5c34b;
 font-family:Nunito,system-ui,sans-serif;color:var(--ink);background:var(--paper) radial-gradient(circle at 20% 10%,#fff8 0 2px,transparent 3px) 0 0/28px 28px}
body.lvl-th h1,body.lvl-th h2,body.lvl-th h3{font-family:"Baloo 2",cursive;line-height:1.2;color:var(--ink)}
body.lvl-th .top{background:var(--paper);border-bottom:2px dashed #3b2f2a33;box-shadow:none}
body.lvl-th .logo{font:800 22px "Baloo 2";color:var(--ink)}body.lvl-th .logo span{color:var(--orange)}
body.lvl-th .crumbs{color:var(--muted)}body.lvl-th .crumbs a{text-decoration:underline}
body.lvl-th .card,body.lvl-th .box{border:2.5px solid var(--ink);border-radius:255px 18px 225px 18px/18px 225px 18px 255px;background:#fffdf7;box-shadow:4px 5px 0 #3b2f2a22}
body.lvl-th .card:nth-child(even),body.lvl-th .box:nth-of-type(even){border-radius:18px 225px 18px 255px/255px 18px 225px 18px}
body.lvl-th .card{transition:transform .15s}body.lvl-th .card:hover{transform:rotate(-1.2deg) scale(1.02);box-shadow:5px 7px 0 #3b2f2a33}
body.lvl-th .card:nth-child(5n+1){background:var(--berry2)}body.lvl-th .card:nth-child(5n+2){background:var(--sky2)}body.lvl-th .card:nth-child(5n+3){background:var(--mint2)}body.lvl-th .card:nth-child(5n+4){background:var(--orange2)}body.lvl-th .card:nth-child(5n){background:#efe2ff}
body.lvl-th .card .em{font-size:34px;width:56px;height:56px;display:grid;place-items:center;background:#fffdf7;border:2px solid var(--ink);border-radius:50%}
body.lvl-th .card .kind,body.lvl-th .kind{color:var(--muted);letter-spacing:.04em}
body.lvl-th .box.idea{background:var(--orange2)}body.lvl-th .box.parents{background:var(--mint2)}body.lvl-th .box.quiz{background:#fffdf7}
body.lvl-th .group{background:#fff;border:2px dashed #3b2f2a55;border-radius:16px}
body.lvl-th .q button,body.lvl-th .quiz button{font-family:Nunito;font-weight:700;border:2.5px solid var(--ink);border-radius:18px 225px 18px 255px/255px 18px 225px 18px;background:#fff;min-height:52px}
body.lvl-th .why{background:var(--sky2);border-radius:14px}
body.lvl-th .pill,body.lvl-th .reset,body.lvl-th .next a{border:2.5px solid var(--ink);background:var(--sun);color:var(--ink);border-radius:255px 18px 225px 18px/18px 225px 18px 255px;box-shadow:3px 4px 0 var(--ink);font-weight:800}
body.lvl-th footer{border-top:2px dashed #3b2f2a33;color:var(--muted)}
body.lvl-th .grade-hero{display:grid;gap:16px;align-items:center;margin:10px 0 18px}
body.lvl-th .grade-hero .pic{padding:8px;transform:rotate(-1deg);border:2.5px solid var(--ink);border-radius:255px 18px 225px 18px/18px 225px 18px 255px;background:#fffdf7;box-shadow:4px 5px 0 #3b2f2a22}
body.lvl-th .grade-hero img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;border-radius:10px}
@media(min-width:860px){body.lvl-th .grade-hero{grid-template-columns:1fr 1.1fr}}
.search{position:relative;margin:12px 0 18px}.search input{width:100%;font-size:1.05em;padding:12px 14px;border-radius:12px;border:2px solid var(--line);background:#fff}#qres{display:grid;gap:6px;margin-top:8px}.qr{display:grid;grid-template-columns:auto 1fr;gap:2px 10px;align-items:center;padding:8px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;text-decoration:none;color:inherit}.qr small{grid-column:2;color:var(--muted)}.qk{font-size:.75em;padding:2px 8px;border-radius:99px;background:var(--soft2);grid-row:span 2}.qk.bai{background:#ffe7c7}.qnone{color:var(--muted)}.lesson-list{list-style:none;padding:0;display:grid;gap:6px;grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr))}.lesson-list a{display:block;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;text-decoration:none;color:inherit}.lesson-list b{color:var(--accent2,#c2410c);margin-right:4px}.tgroup{margin:10px 0}.tgroup summary{font-weight:800;font-size:1.1em;cursor:pointer;padding:6px 0}.subj-grid .subj h3{font-size:1.3em}.card.off,.box.off{opacity:.65}.yt{position:relative;aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#000;cursor:pointer}.yt img{width:100%;height:100%;object-fit:cover;display:block}.yt button{position:absolute;inset:0;margin:auto;width:72px;height:52px;border:0;border-radius:14px;background:#e11;color:#fff;font-size:24px;cursor:pointer}.yt iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.tag-v{font-size:.85em}