[hidden]{display:none!important}
:root{
  --bg:#f6f7fb; --card:#fff; --text:#141826; --muted:#5d6478; --line:#e3e6ee;
  --brand:#4f46e5; --brand-2:#7c3aed; --brand-soft:#eef0ff; --ok:#059669; --bad:#dc2626; --warn:#d97706;
  --radius:14px; --shadow:0 1px 2px rgba(20,24,38,.06),0 4px 16px rgba(20,24,38,.06);
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#0f1220; --card:#181c2e; --text:#eef0f7; --muted:#a3a9bf; --line:#2a2f47; --brand-soft:#252a4a; --shadow:none; }
}
*{box-sizing:border-box}
html,body{margin:0}
body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--brand);text-decoration:none} a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.2;margin:.2em 0 .5em} h1{font-size:1.9rem} h2{font-size:1.35rem} h3{font-size:1.1rem}
.container{max-width:1080px;width:100%;margin:0 auto;padding:24px 16px;flex:1}
.topbar{display:flex;align-items:center;gap:16px;padding:10px 16px;background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:8px;white-space:nowrap;font-weight:800;color:var(--text);font-size:1.1rem}
.brand:hover{text-decoration:none}
.logo{display:inline-flex;align-items:center;justify-content:center;flex:none;white-space:nowrap;place-items:center;width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-size:.85rem;letter-spacing:-1px}
.logo b{color:#fde68a}
.mainnav{display:flex;gap:14px;flex:1;flex-wrap:wrap} .mainnav a{color:var(--muted);font-weight:500}
.userbox{display:flex;gap:8px;align-items:center}
.footer{text-align:center;color:var(--muted);font-size:.85rem;padding:24px 16px;border-top:1px solid var(--line)}
.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--card);color:var(--text);padding:8px 14px;border-radius:10px;font:inherit;font-weight:600;cursor:pointer}
.btn:hover{text-decoration:none;border-color:var(--brand)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.primary:hover{filter:brightness(1.08)}
.btn.danger{color:var(--bad)} .btn.sm{padding:4px 10px;font-size:.85rem} .btn:disabled{opacity:.5;cursor:not-allowed}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap} .between{justify-content:space-between}
.stack>*+*{margin-top:12px}
.muted{color:var(--muted)} .small{font-size:.85rem}
.pill{display:inline-block;padding:2px 10px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-size:.78rem;font-weight:600}
input,textarea,select{width:100%;font:inherit;padding:9px 12px;border:1px solid var(--line);border-radius:10px;background:var(--card);color:var(--text)}
textarea{min-height:90px;resize:vertical}
label{font-weight:600;font-size:.9rem;display:block;margin-bottom:4px}
.field{margin-bottom:12px}
.hero{padding:48px 24px;border-radius:20px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;margin-bottom:28px}
.hero h1{font-size:2.3rem} .hero p{font-size:1.1rem;opacity:.92;max-width:640px}
.hero .btn{background:#fff;color:var(--brand);border-color:#fff}
.feature h3{margin-top:4px}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:12px 0 20px;overflow-x:auto}
.tabs a{padding:10px 14px;color:var(--muted);font-weight:600;border-bottom:2px solid transparent;white-space:nowrap}
.tabs a.active{color:var(--text);border-color:var(--brand)} .tabs a:hover{text-decoration:none;color:var(--text)}
.cover{height:90px;border-radius:12px;margin-bottom:12px}
.post{cursor:pointer} .post h3{margin:6px 0}
.avatar{width:34px;height:34px;border-radius:50%;display:inline-grid;place-items:center;background:var(--brand-soft);color:var(--brand);font-weight:700;font-size:.85rem;flex:none;position:relative}
.avatar .lvl{position:absolute;right:-4px;bottom:-4px;background:var(--brand);color:#fff;border-radius:50%;width:16px;height:16px;font-size:.62rem;display:grid;place-items:center}
.list>*{border-bottom:1px solid var(--line);padding:10px 0} .list>*:last-child{border-bottom:0}
/* flashcards */
.flash{perspective:1200px;height:300px;cursor:pointer;margin:12px 0}
.flash-inner{position:relative;width:100%;height:100%;transition:transform .45s;transform-style:preserve-3d}
.flash.flipped .flash-inner{transform:rotateY(180deg)}
.flash-face{position:absolute;inset:0;backface-visibility:hidden;display:grid;place-items:center;padding:24px;text-align:center;font-size:1.5rem;font-weight:600;background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:auto}
.flash-back{transform:rotateY(180deg)}
.choice{display:block;width:100%;text-align:left;margin:8px 0;padding:12px 14px}
.choice.correct{border-color:var(--ok);background:rgba(5,150,105,.1)} .choice.wrong{border-color:var(--bad);background:rgba(220,38,38,.08)}
.progress{height:8px;background:var(--line);border-radius:99px;overflow:hidden} .progress>div{height:100%;background:var(--brand);transition:width .3s}
.match-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.tile{min-height:90px;display:grid;place-items:center;text-align:center;padding:10px;border:1px solid var(--line);border-radius:12px;background:var(--card);cursor:pointer;font-weight:500}
.tile.sel{border-color:var(--brand);background:var(--brand-soft)} .tile.gone{visibility:hidden} .tile.bad{border-color:var(--bad)}
.cardrow{display:grid;grid-template-columns:1fr 1fr auto;gap:8px;margin-bottom:8px}
.lesson-link{display:flex;justify-content:space-between;padding:10px 12px;border-radius:10px;color:var(--text)}
.lesson-link.active,.lesson-link:hover{background:var(--brand-soft);text-decoration:none}
.two-col{display:grid;grid-template-columns:280px 1fr;gap:20px}
.video{position:relative;padding-top:56.25%;border-radius:12px;overflow:hidden;background:#000;margin-bottom:12px}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--text);color:var(--bg);padding:10px 18px;border-radius:10px;z-index:50;max-width:90vw}
.empty{text-align:center;padding:32px;color:var(--muted)}
.big{font-size:2.4rem;font-weight:800}
@media (max-width:720px){ .two-col{grid-template-columns:1fr} .cardrow{grid-template-columns:1fr} .hero h1{font-size:1.7rem} .mainnav{order:3;width:100%} }
/* v2: profiles, notifications, messages, switcher */
.switcher select{width:auto;max-width:220px;padding:6px 10px;font-size:.88rem;font-weight:600;background:var(--brand-soft);border-color:transparent;color:var(--text)}
.iconbtn{position:relative;display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;font-size:1.15rem;text-decoration:none}
.iconbtn:hover{background:var(--brand-soft);text-decoration:none}
.badge{position:absolute;top:-4px;right:-6px;background:#ef4444;color:#fff;border-radius:999px;font-size:.66rem;font-weight:700;padding:1px 6px;line-height:1.5;min-width:18px;text-align:center}
.badge.static{position:static}
.avatar img{width:100%;height:100%;border-radius:50%;object-fit:cover}
.avatar.big{width:64px;height:64px;font-size:1.4rem}
.avatar.xl{width:180px;height:180px;font-size:3.5rem;margin:0 auto}
.avatar.xl .lvl{display:none}
a.who{color:inherit;font-weight:600} a.who:hover{color:var(--brand)}
.profile-layout{display:grid;grid-template-columns:1fr 290px;gap:28px;align-items:start}
.profile-layout h2{margin:12px 0 4px;font-size:1.1rem}
.profile-card{text-align:left;position:sticky;top:76px}
.profile-card hr{border:0;border-top:1px solid var(--line);margin:4px 0;width:100%}
.stats{display:grid;grid-template-columns:repeat(3,1fr);text-align:center}
.stats>*{display:flex;flex-direction:column;color:inherit;border-right:1px solid var(--line)} .stats>*:last-child{border-right:0}
.stats b{font-size:1.15rem} .stats span{font-size:.75rem;color:var(--muted)} .stats a:hover{text-decoration:none;color:var(--brand)}
.heat-wrap{overflow-x:auto;padding-bottom:4px}
.heat-months{display:grid;margin-left:34px;font-size:.72rem;color:var(--muted);height:16px}
.heat-body{display:flex;gap:6px}
.heat-days{display:grid;grid-template-rows:repeat(7,11px);gap:3px;font-size:.66rem;color:var(--muted);width:28px;line-height:11px}
.heat{display:grid;grid-auto-flow:column;grid-template-rows:repeat(7,11px);grid-auto-columns:11px;gap:3px}
.heat i,.hk{display:inline-block;width:11px;height:11px;border-radius:2px;background:var(--line)}
.l1{background:#9be9c8!important}.l2{background:#4fcf9a!important}.l3{background:#1fa971!important}.l4{background:#0b7a4f!important}
.mem-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px}
.mem{color:inherit;gap:10px;align-items:center} .mem:hover{text-decoration:none} .mem:hover b{color:var(--brand)}
.mem-ic{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;color:#fff;font-weight:800;flex:none}
.notif{padding:12px 8px!important;border-radius:10px} .notif.unread{background:var(--brand-soft)}
.chat{grid-template-columns:280px 1fr}
.chat-pane{display:flex;flex-direction:column;gap:10px;min-height:460px}
.chat-log{flex:1;overflow-y:auto;max-height:55vh;display:flex;flex-direction:column;gap:8px;padding:6px 2px}
.msg{max-width:75%;align-self:flex-start;background:var(--brand-soft);padding:8px 12px;border-radius:14px 14px 14px 4px}
.msg.mine{align-self:flex-end;background:var(--brand);color:#fff;border-radius:14px 14px 4px 14px} .msg.mine a{color:#fff}
.msg span{display:block;font-size:.68rem;opacity:.7;margin-top:2px}
.ellipsis{display:inline-block;max-width:150px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;vertical-align:bottom}
@media (max-width:820px){ .profile-layout{grid-template-columns:1fr} .profile-card{position:static;order:-1} .chat{grid-template-columns:1fr} }
/* v3: header search, create menu, dashboard, library, footer, plus, modal */
.topbar{gap:12px}
.hsearch{flex:1;min-width:180px;max-width:560px;display:flex;align-items:center;gap:8px;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:0 12px}
.hsearch input{border:0;background:transparent;padding:9px 0}
.hsearch input:focus{outline:none}
.mainnav{flex:0 0 auto;align-items:center;gap:10px}
.pillbtn{background:var(--brand-soft);color:var(--text)!important;padding:7px 14px;border-radius:999px;font-weight:600;font-size:.88rem;white-space:nowrap}
.pillbtn:hover{text-decoration:none;filter:brightness(.97)}
.plus-circle{width:38px;height:38px;border-radius:50%;border:0;background:var(--brand);color:#fff;font-size:1.3rem;cursor:pointer;display:grid;place-items:center}
.btn.yellow{background:#ffcd1f;border-color:#ffcd1f;color:#111;border-radius:999px}
.btn.ghost{background:#2e3354;border-color:#2e3354;color:#fff;border-radius:999px}
.dropdown{position:relative}
.menu{position:absolute;right:0;top:calc(100% + 8px);background:var(--card);border:1px solid var(--line);border-radius:14px;box-shadow:0 10px 30px rgba(0,0,0,.12);padding:8px;min-width:230px;z-index:30}
.menu a{display:flex;gap:10px;align-items:center;padding:9px 12px;border-radius:8px;color:var(--text);font-weight:500}
.menu a:hover{background:var(--brand-soft);text-decoration:none}
.dash{display:grid;grid-template-columns:220px 1fr;gap:28px}
.sidebar{position:sticky;top:76px;align-self:start;display:flex;flex-direction:column;gap:2px}
.side-link{display:flex;align-items:center;gap:12px;padding:9px 12px;border-radius:10px;color:var(--text);font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.side-link:hover{background:var(--brand-soft);text-decoration:none}
.side-link.active{background:var(--brand-soft);color:var(--brand);font-weight:700}
.side-link>span:first-child{width:22px;text-align:center;flex:none}
.side-dot{width:22px;height:22px;border-radius:6px;color:#fff;font-size:.75rem;font-weight:800;display:grid;place-items:center}
.side-h{border-top:1px solid var(--line);margin:12px 0 4px;padding:14px 12px 4px;font-size:.85rem;color:var(--muted);font-weight:600}
.dash-main{min-width:0}
.quick{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:20px}
.qa{position:relative}
.qa-btn{width:100%;display:flex;align-items:center;justify-content:center;gap:8px;padding:22px 12px;border-radius:14px;background:#e9f3fb;border:0;font:inherit;font-weight:700;color:var(--text);cursor:pointer;text-decoration:none!important}
.qa-btn:hover{filter:brightness(.97)}
@media (prefers-color-scheme: dark){ .qa-btn{background:#1f2a40} }
.qa .menu{left:0;right:auto}
.promo{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:stretch;margin-bottom:8px}
.promo h2{font-size:1.3rem;margin-top:6px}
.btn.wide{width:100%;justify-content:center;border-radius:999px;padding:11px}
.promo>div:first-child{display:flex;flex-direction:column;justify-content:space-between}
.promo-art{border-radius:12px;background:linear-gradient(135deg,#c9ecff,#e8f6ff);display:grid;place-items:center;font-size:4rem;min-height:170px}
.player-art{border-radius:14px;background:linear-gradient(135deg,#4f46e5 55%,#0f766e);padding:22px;display:flex;flex-direction:column;justify-content:center;gap:10px;min-height:170px}
.pa-bar{height:8px;border-radius:9px;background:rgba(255,255,255,.35);width:75%} .pa-bar.short{width:40%}
.player-art .progress{background:rgba(255,255,255,.25)} .player-art .progress>div{background:#c7d2fe}
.pa-btn{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;color:#fff;font-size:1.2rem;border:0;background:transparent;cursor:pointer}
.pa-btn.play{background:#fff;color:var(--brand);width:48px;height:48px}
.hscroll{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(220px,260px);gap:14px;overflow-x:auto;padding-bottom:6px;scroll-snap-type:x mandatory}
.set-card{color:inherit;text-decoration:none!important;scroll-snap-align:start;display:flex;flex-direction:column;gap:6px;min-height:150px}
.set-ic{width:44px;height:44px;border-radius:10px;background:var(--bg);display:grid;place-items:center;font-size:1.3rem}
.or{text-align:center;color:var(--muted);margin:12px 0;font-size:.85rem}
.footer{text-align:left;padding:32px 16px 20px;background:var(--card)}
.foot-grid{max-width:1080px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}
.foot-grid h4{margin:0 0 8px;font-size:.9rem}
.foot-grid a:not(.brand){display:block;color:var(--muted);padding:3px 0;font-size:.9rem}
.foot-bottom{max-width:1080px;margin:24px auto 0;border-top:1px solid var(--line);padding-top:16px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.foot-bottom a{color:var(--muted);font-weight:500}
.ask-btn{background:#1b1e2e;color:#fff!important;padding:10px 20px;border-radius:999px;font-weight:700}
.ask-btn:hover{text-decoration:none;filter:brightness(1.2)}
.lang select{width:auto;border:0;background:transparent;font-weight:600;color:var(--muted)}
.prose{max-width:760px} .prose h3{margin-top:22px}
.faq summary{cursor:pointer} .faq{margin-bottom:10px}
.gtable{width:100%;border-collapse:collapse} .gtable td,.gtable th{border-bottom:1px solid var(--line);padding:8px;text-align:left;vertical-align:top}
.print-only{display:none}
@media print{ .topbar,.footer,.noprint,.toast{display:none!important} .print-only{display:block} .card{box-shadow:none;break-inside:avoid} details{display:none} body{background:#fff;color:#000} }
.listen{text-align:center} .listen-art{font-size:3rem} .big-btn{font-size:1.3rem;padding:10px 22px}
.modal-bg{position:fixed;inset:0;background:rgba(10,12,30,.45);display:grid;place-items:center;z-index:60;padding:16px}
.modal{background:var(--card);border-radius:18px;padding:22px;max-width:400px;width:100%;position:relative;max-height:90vh;overflow:auto}
.modal h3{font-weight:600;margin-right:24px}
.modal-x{position:absolute;right:12px;top:10px;border:0;background:transparent;font-size:1.1rem;cursor:pointer;color:var(--muted)}
.onb-opt{display:block;width:100%;margin:8px 0;padding:12px;border-radius:10px;border:0;background:var(--brand-soft);color:var(--brand);font:inherit;font-weight:500;cursor:pointer}
.onb-opt:hover{filter:brightness(.96)}
.plus-hero{background:radial-gradient(circle at 20% 20%,#2a1f78,#130f3d 70%);color:#fff;border-radius:22px;padding:44px 24px;text-align:center}
.plus-hero h1{font-size:2.2rem} .plus-hero p{opacity:.9}
.plus-logo{font-size:2.1rem;font-weight:800;letter-spacing:-.5px} .plus-logo b{color:#ffcd1f} .plus-logo span{display:block;font-size:1.1rem;font-weight:400}
.plus-price span{font-size:.9rem;opacity:.8}
.timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;text-align:left;margin-top:18px}
.tl-top{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.tl-ic{width:44px;height:44px;border-radius:50%;background:#2e3354;display:grid;place-items:center;font-weight:800;flex:none} .tl-ic.on{background:#ffcd1f;color:#111}
.tl-line{flex:1;height:3px;background:#4b5175;border-radius:3px}
.tl p{opacity:.8;font-size:.9rem;margin:4px 0 0}
.plus-benefits{background:#0d0a2c;color:#fff;border-radius:22px;padding:32px 24px;margin-top:20px}
.plus-benefits h2{text-align:center} .plus-benefits li{margin:8px 0} .plus-benefits li::marker{color:#ffcd1f}
.two-col-eq{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media (max-width:900px){ .dash{grid-template-columns:1fr} .sidebar{position:static;flex-direction:row;overflow-x:auto;gap:4px} .side-h{display:none} .pillbtn{display:none} }
@media (max-width:720px){ .quick,.promo,.timeline,.two-col-eq,.foot-grid{grid-template-columns:1fr} .hsearch{order:4;max-width:none;width:100%} }
/* v4: Scribd-style footer + install badge */
.footer{background:#faf8f5;color:#1a1a1a}
@media (prefers-color-scheme: dark){ .footer{background:#12152a;color:var(--text)} }
.foot-grid{max-width:1200px;grid-template-columns:repeat(5,1fr) 1.2fr}
.foot-grid h4{font-size:1rem;margin-bottom:14px}
.foot-grid a:not(.brand){color:inherit;padding:6px 0;font-size:.92rem}
.app-badge{display:flex;align-items:center;gap:10px;background:#000;color:#fff;border:0;border-radius:8px;padding:8px 16px;cursor:pointer;font:inherit;text-align:left}
.app-badge span:first-child{font-size:1.6rem}
.app-badge small{display:block;font-size:.65rem;opacity:.85}
.app-badge span:last-child{font-weight:700;font-size:1rem;line-height:1.15}
.foot-bottom{max-width:1200px}
.foot-bottom a,.foot-rights a{color:inherit}
.foot-rights{max-width:1200px;margin:14px auto 0} .foot-rights a{text-decoration:underline}
.lang select{color:inherit;font-weight:700;padding:2px}
.ask-btn.floating{position:fixed;right:20px;bottom:20px;z-index:25;box-shadow:0 6px 20px rgba(0,0,0,.2)}
@media (max-width:900px){ .foot-grid{grid-template-columns:repeat(2,1fr)} }
@media print{ .ask-btn.floating{display:none} }
/* v4: animated promo banners */
.banners{position:relative;border-radius:24px;overflow:hidden;margin:0 0 26px;min-height:370px;box-shadow:0 18px 50px -20px rgba(79,70,229,.55)}
.b-track{position:relative;min-height:370px}
.banner{position:absolute;inset:0;display:grid;grid-template-columns:1.4fr 1fr;align-items:center;padding:36px 48px 64px;color:#fff;opacity:0;transform:scale(1.03);transition:opacity .8s ease,transform .8s ease;pointer-events:none;background-size:220% 220%;animation:gshift 12s ease infinite;overflow:hidden}
.banner.active{opacity:1;transform:none;pointer-events:auto;z-index:1}
.b1{background-image:linear-gradient(120deg,#4f46e5,#7c3aed,#db2777,#4f46e5)}
.b2{background-image:linear-gradient(120deg,#f97316,#ec4899,#8b5cf6,#f97316)}
.b3{background-image:linear-gradient(120deg,#0ea5e9,#14b8a6,#6366f1,#0ea5e9)}
.b4{background-image:linear-gradient(120deg,#7c3aed,#2563eb,#06b6d4,#7c3aed)}
.b5{background-image:linear-gradient(120deg,#059669,#0891b2,#7c3aed,#059669)}
.b6{background-image:linear-gradient(120deg,#e11d48,#f59e0b,#db2777,#e11d48)}
@keyframes gshift{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
.blob{position:absolute;border-radius:50%;filter:blur(40px);opacity:.45;mix-blend-mode:screen;animation:drift 14s ease-in-out infinite}
.blob.a{width:320px;height:320px;background:#fde68a;top:-120px;right:8%}
.blob.b{width:260px;height:260px;background:#a5f3fc;bottom:-120px;left:30%;animation-delay:-5s}
.blob.c{width:200px;height:200px;background:#f9a8d4;top:30%;right:-60px;animation-delay:-9s}
@keyframes drift{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(30px,-20px) scale(1.1)}66%{transform:translate(-25px,15px) scale(.95)}}
.b-copy{position:relative;z-index:2;max-width:560px}
.b-tag{display:inline-block;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.35);backdrop-filter:blur(6px);padding:5px 12px;border-radius:999px;font-weight:700;font-size:.82rem;letter-spacing:.3px}
.banner h2{font-size:clamp(1.6rem,3vw,2.3rem);line-height:1.1;margin:14px 0 10px;font-weight:800;letter-spacing:-.6px;text-shadow:0 2px 18px rgba(0,0,0,.18)}
.banner p{font-size:1.05rem;opacity:.95;margin:0 0 20px;line-height:1.55}
.b-cta{display:inline-block;background:#fff;color:#1e1b4b;font-weight:800;padding:12px 22px;border-radius:999px;box-shadow:0 10px 24px -8px rgba(0,0,0,.35);transition:transform .2s}
.b-cta:hover{text-decoration:none;transform:translateY(-2px)}
.banner.active .b-tag,.banner.active h2,.banner.active p,.banner.active .b-cta{animation:rise .7s ease both}
.banner.active h2{animation-delay:.08s}.banner.active p{animation-delay:.16s}.banner.active .b-cta{animation-delay:.24s}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.b-art{position:relative;height:220px;z-index:2}
.float{position:absolute;display:grid;place-items:center;width:96px;height:96px;font-size:3rem;border-radius:26px;background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.4);backdrop-filter:blur(8px);box-shadow:0 14px 30px -12px rgba(0,0,0,.35);animation:bob 5s ease-in-out infinite}
.float.f0{top:10px;left:18%}.float.f1{top:90px;right:6%;width:118px;height:118px;font-size:3.6rem;animation-delay:-1.6s}.float.f2{bottom:0;left:40%;animation-delay:-3.2s}
@keyframes bob{0%,100%{transform:translateY(0) rotate(-3deg)}50%{transform:translateY(-14px) rotate(3deg)}}
.b-nav{position:absolute;top:50%;transform:translateY(-50%);z-index:3;width:40px;height:40px;border-radius:50%;border:0;background:rgba(255,255,255,.25);color:#fff;font-size:1.6rem;cursor:pointer;backdrop-filter:blur(6px)}
.b-nav:hover{background:rgba(255,255,255,.4)} .b-nav.prev{left:12px} .b-nav.next{right:12px}
.b-dots{position:absolute;bottom:18px;left:48px;z-index:3;display:flex;gap:8px}
.b-dots button{width:9px;height:9px;border-radius:9px;border:0;background:rgba(255,255,255,.5);cursor:pointer;transition:width .3s,background .3s;padding:0}
.b-dots button.on{width:28px;background:#fff}
.b-progress{position:absolute;left:0;right:0;bottom:0;height:3px;background:rgba(255,255,255,.2);z-index:3}.b-progress i{display:block;height:100%;width:0;background:#fff}
@media (max-width:760px){ .banner{grid-template-columns:1fr;padding:28px 22px 56px} .b-art{display:none} .banner h2{font-size:1.7rem} .banners,.b-track{min-height:430px} .b-dots{left:22px} .b-nav{display:none} }
@media (prefers-reduced-motion: reduce){ .banner,.blob,.float,.banner.active *{animation:none!important;transition:none!important} }
/* share + invite + streak */
.share-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:14px}
.share-grid a{display:block;text-align:center;padding:10px;border-radius:10px;background:var(--c);color:#fff;font-weight:700}
.share-grid a:hover{text-decoration:none;filter:brightness(1.08)}
.dash-cards{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:18px}
.invite{display:flex;align-items:center;justify-content:space-between;gap:12px;background:linear-gradient(120deg,#fff7ed,#fdf2f8);border-color:#fbcfe8}
@media (prefers-color-scheme: dark){ .invite{background:linear-gradient(120deg,#3b1d2e,#2a1f45);border-color:#5b2a4a} }
.streak{display:flex;gap:14px;align-items:center}
.flame{font-size:2.6rem;filter:grayscale(1);opacity:.5} .flame.lit{filter:none;opacity:1;animation:flick 1.6s ease-in-out infinite}
@keyframes flick{0%,100%{transform:scale(1) rotate(-2deg)}50%{transform:scale(1.08) rotate(2deg)}}
.week{display:flex;gap:6px}.week span{display:flex;flex-direction:column;align-items:center;font-size:.72rem;color:var(--muted);gap:2px}
.week i{width:26px;height:26px;border-radius:50%;background:var(--line);display:grid;place-items:center;font-style:normal;color:#fff;font-weight:800}
.week span.on i{background:linear-gradient(135deg,#f97316,#ef4444)} .week span.today i{outline:2px solid var(--brand);outline-offset:2px}
@media (max-width:760px){ .dash-cards{grid-template-columns:1fr} }
/* live game */
.live-hero,.live-stage{background:radial-gradient(circle at 15% 10%,#6d28d9,#1e1b4b 65%);color:#fff;border-radius:24px;padding:36px 24px;text-align:center;min-height:420px}
.live-hero h1,.live-stage h1{font-size:2.2rem}
.pin{font-size:3.4rem;font-weight:800;letter-spacing:6px;background:#fff;color:#1e1b4b;border-radius:16px;padding:4px 20px;display:inline-block;margin-top:6px}
.lobby{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:18px}
.pchip{background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.3);padding:8px 16px;border-radius:999px;font-weight:700;animation:rise .4s ease both}
.pchip.big{font-size:1.3rem;display:inline-block;margin-bottom:16px}
.clock{display:inline-grid;place-items:center;width:56px;height:56px;border-radius:50%;background:#fff;color:#1e1b4b;font-weight:800;font-size:1.4rem}
.lq{font-size:2rem;margin:26px auto;max-width:900px;line-height:1.25} .small-lq{font-size:1.3rem}
.lopts{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:1000px;margin:0 auto}
.lopt{display:flex;gap:12px;align-items:center;text-align:left;padding:20px;border-radius:14px;font-size:1.15rem;font-weight:700;color:#fff;border:0;font-family:inherit;min-height:84px}
button.lopt{cursor:pointer} button.lopt:active{transform:scale(.97)}
.lopt b{font-size:1.4rem}
.o0{background:#e11d48}.o1{background:#2563eb}.o2{background:#d97706}.o3{background:#059669}
.bars{display:flex;gap:16px;justify-content:center;align-items:flex-end;height:170px;margin:20px 0}
.barcol{display:flex;flex-direction:column;align-items:center;gap:4px}
.bar{width:70px;border-radius:10px 10px 0 0;display:grid;place-items:start center;padding-top:6px;font-weight:800;opacity:.55}.bar.win{opacity:1;box-shadow:0 0 0 3px #fff}
.lboard{max-width:520px;margin:12px auto;padding:0;list-style:none;counter-reset:r}
.lboard li{display:flex;justify-content:space-between;background:rgba(255,255,255,.12);padding:10px 16px;border-radius:12px;margin:6px 0;font-weight:700;counter-increment:r}
.lboard li span::before{content:counter(r) ".  ";opacity:.7} .lboard li.me{background:#ffcd1f;color:#111}
.podium{display:flex;justify-content:center;align-items:flex-end;gap:12px;margin:24px 0}
.pod{text-align:center;width:150px}.pname{font-weight:800;margin-bottom:6px;animation:rise .6s ease both}
.pstep{background:rgba(255,255,255,.18);border-radius:14px 14px 0 0;padding:14px;font-size:1.4rem;font-weight:800}
.p0 .pstep{height:170px;background:linear-gradient(#fbbf24,#d97706)}.p1 .pstep{height:130px;background:linear-gradient(#e5e7eb,#9ca3af);color:#111}.p2 .pstep{height:100px;background:linear-gradient(#fdba74,#c2410c)}
.live-stage.join.right{background:radial-gradient(circle,#059669,#064e3b)} .live-stage.join.wrong{background:radial-gradient(circle,#e11d48,#4c0519)}
.bigin{font-size:1.3rem;text-align:center;padding:14px;font-weight:700}
@media (max-width:640px){ .lopts{grid-template-columns:1fr} .lq{font-size:1.4rem} .pin{font-size:2.4rem} }
.cardrow4{grid-template-columns:1fr 1.4fr auto auto}
@media (max-width:720px){ .cardrow4{grid-template-columns:1fr auto auto} .cardrow4 .d{grid-column:1/-1;order:5} }
.res:hover h3{color:var(--brand)}
/* v6: AI tutor */
.tutor{display:grid;grid-template-columns:270px 1fr;gap:18px;align-items:start}
.tutor-side{position:sticky;top:76px}
.tutor-av{width:64px;height:64px;border-radius:20px;display:grid;place-items:center;font-size:2rem;background:linear-gradient(135deg,#6366f1,#ec4899);box-shadow:0 10px 24px -10px #6366f1}
.tmode{display:block;width:100%;text-align:left;margin:6px 0;padding:9px 12px;border-radius:10px;border:1px solid var(--line);background:var(--card);color:var(--text);font:inherit;cursor:pointer}
.tmode.on{background:var(--brand-soft);border-color:var(--brand);color:var(--brand);font-weight:700}
.tutor-main{display:flex;flex-direction:column;min-height:72vh;padding:0;overflow:hidden}
.tutor-log{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:14px;max-height:62vh}
.tutor-hello{text-align:center;margin:auto;padding:30px}
.tmsg{display:flex;gap:10px;align-items:flex-start}.tmsg.user{justify-content:flex-end}
.tav{width:32px;height:32px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,#6366f1,#ec4899);flex:none}
.tbub{max-width:78%;padding:12px 15px;border-radius:16px;line-height:1.55}
.tmsg.assistant .tbub{background:var(--bg);border:1px solid var(--line);border-top-left-radius:4px}
.tmsg.user .tbub{background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;border-top-right-radius:4px}
.tbub ul,.tbub ol{margin:6px 0;padding-left:20px}.tbub pre{background:#0f172a;color:#e2e8f0;padding:10px;border-radius:8px;overflow:auto}.tbub code{background:rgba(99,102,241,.12);padding:1px 5px;border-radius:5px}
.typing{display:flex;gap:4px}.typing i{width:8px;height:8px;border-radius:50%;background:var(--muted);animation:tdot 1s infinite}.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
@keyframes tdot{0%,100%{opacity:.3;transform:translateY(0)}50%{opacity:1;transform:translateY(-4px)}}
.tchips{display:flex;flex-wrap:wrap;gap:8px;padding:0 20px 10px}
.tchip{border:1px solid var(--line);background:var(--card);border-radius:999px;padding:7px 14px;cursor:pointer;font:inherit;font-size:.88rem;color:var(--text)}.tchip:hover{border-color:var(--brand);color:var(--brand)}
.tutor-input{display:flex;gap:8px;align-items:flex-end;padding:12px 16px;border-top:1px solid var(--line);background:var(--card)}
.tutor-input textarea{min-height:44px;resize:none;border-radius:12px}
.tutor-note{margin:0 20px 10px;padding:10px 14px;border-radius:10px;background:#fef3c7;color:#92400e;font-size:.9rem}
@media (max-width:860px){ .tutor{grid-template-columns:1fr} .tutor-side{position:static} .tbub{max-width:90%} }