@font-face{font-family:"Hind Siliguri";font-weight:400;font-display:swap;src:url(../vendor/fonts/hind-siliguri-bengali-400.woff2) format("woff2");unicode-range:U+0951-0952, U+0964-0965, U+0980-09FE, U+1CD0, U+1CD2, U+1CD5-1CD6, U+1CD8, U+1CE1, U+1CEA, U+1CED, U+1CF2, U+1CF5-1CF7, U+200C-200D, U+20B9, U+25CC, U+A8F1, U+11DF0-11DF1}
@font-face{font-family:"Hind Siliguri";font-weight:400;font-display:swap;src:url(../vendor/fonts/hind-siliguri-latin-400.woff2) format("woff2");unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD}
@font-face{font-family:"Hind Siliguri";font-weight:500;font-display:swap;src:url(../vendor/fonts/hind-siliguri-bengali-500.woff2) format("woff2");unicode-range:U+0951-0952, U+0964-0965, U+0980-09FE, U+1CD0, U+1CD2, U+1CD5-1CD6, U+1CD8, U+1CE1, U+1CEA, U+1CED, U+1CF2, U+1CF5-1CF7, U+200C-200D, U+20B9, U+25CC, U+A8F1, U+11DF0-11DF1}
@font-face{font-family:"Hind Siliguri";font-weight:500;font-display:swap;src:url(../vendor/fonts/hind-siliguri-latin-500.woff2) format("woff2");unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD}
@font-face{font-family:"Hind Siliguri";font-weight:600;font-display:swap;src:url(../vendor/fonts/hind-siliguri-bengali-600.woff2) format("woff2");unicode-range:U+0951-0952, U+0964-0965, U+0980-09FE, U+1CD0, U+1CD2, U+1CD5-1CD6, U+1CD8, U+1CE1, U+1CEA, U+1CED, U+1CF2, U+1CF5-1CF7, U+200C-200D, U+20B9, U+25CC, U+A8F1, U+11DF0-11DF1}
@font-face{font-family:"Hind Siliguri";font-weight:600;font-display:swap;src:url(../vendor/fonts/hind-siliguri-latin-600.woff2) format("woff2");unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD}
@font-face{font-family:"Hind Siliguri";font-weight:700;font-display:swap;src:url(../vendor/fonts/hind-siliguri-bengali-700.woff2) format("woff2");unicode-range:U+0951-0952, U+0964-0965, U+0980-09FE, U+1CD0, U+1CD2, U+1CD5-1CD6, U+1CD8, U+1CE1, U+1CEA, U+1CED, U+1CF2, U+1CF5-1CF7, U+200C-200D, U+20B9, U+25CC, U+A8F1, U+11DF0-11DF1}
@font-face{font-family:"Hind Siliguri";font-weight:700;font-display:swap;src:url(../vendor/fonts/hind-siliguri-latin-700.woff2) format("woff2");unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD}
@font-face{font-family:"Plus Jakarta Sans";font-weight:600 800;font-display:swap;src:url(../vendor/fonts/plus-jakarta-sans-latin-600.woff2) format("woff2");unicode-range:U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD}
:root{--bg:#0b0a1a;--bg2:#161427;--glass:rgba(22,20,39,.66);--glassS:rgba(19,17,36,.9);--glass2:rgba(196,181,253,.06);--line:rgba(196,181,253,.14);--line2:rgba(196,181,253,.28);
--text:#f5f3ff;--muted:#a8a3c9;--soft:#d9d4f5;--violet:#6c51e8;--violet2:#a855f7;--pink:#ec4899;--lav:#c4b5fd;--lav2:#cfc4ff;--accent:#a855f7;--accent2:#c4b5fd;--ok:#10b981;--warn:#f59e0b;--bad:#fb7185;
--grad:linear-gradient(100deg,#6c51e8,#a855f7 60%,#ec4899);--gradT:linear-gradient(100deg,#e9e3ff 0%,#c4b5fd 40%,#f0abfc 75%,#ffb8e0);--glow:0 0 60px -12px rgba(108,81,232,.55);--shadow:0 24px 60px -24px rgba(0,0,0,.7);
--font:"Hind Siliguri","Plus Jakarta Sans",system-ui,sans-serif;--display:"Plus Jakarta Sans","Hind Siliguri",system-ui,sans-serif;
--top:64px;--modes:52px;--panelW:360px;--sab:env(safe-area-inset-bottom,0px);--sat:env(safe-area-inset-top,0px);--peek:70px}
@media(min-width:1280px){html.rail{--panelW:392px}}
@media(max-height:540px){html.rail{--top:54px;--modes:46px;--panelW:300px}}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%;background:var(--bg);color:var(--text);font-family:var(--font);overflow:hidden;overscroll-behavior:none;-webkit-font-smoothing:antialiased}
body{height:100dvh;background:radial-gradient(55% 45% at 50% 45%,rgba(91,52,220,.30),transparent 70%),radial-gradient(35% 30% at 88% 6%,rgba(236,72,153,.12),transparent 70%),radial-gradient(40% 35% at 5% 100%,rgba(108,81,232,.16),transparent 70%),var(--bg)}
html.rail body[data-mode=landing]{background:radial-gradient(42% 55% at 70% 50%,rgba(91,52,220,.34),transparent 70%),radial-gradient(30% 30% at 92% 8%,rgba(236,72,153,.12),transparent 70%),radial-gradient(35% 40% at 0% 100%,rgba(108,81,232,.14),transparent 70%),var(--bg)}
body:before{content:"";position:fixed;inset:0;background-image:radial-gradient(rgba(196,181,253,.13) 1px,transparent 1.2px);background-size:30px 30px;-webkit-mask-image:radial-gradient(ellipse 70% 60% at 50% 50%,#000 10%,transparent 75%);mask-image:radial-gradient(ellipse 70% 60% at 50% 50%,#000 10%,transparent 75%);pointer-events:none}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none;padding:0}
.hidden{display:none!important}
svg.i{flex:none;display:block}
.spacer{flex:1}
:focus-visible{outline:2px solid var(--lav);outline-offset:2px}
/* canvas */
#view{position:fixed;inset:0;touch-action:none;transition:right .35s cubic-bezier(.2,.8,.2,1)}
#view canvas{display:block}
html.rail body.panelOn #view{right:var(--panelW)}
#view.hov{cursor:pointer}
/* header */
.top{position:fixed;top:var(--sat);left:0;right:0;height:var(--top);display:flex;align-items:center;gap:8px;padding:0 12px;z-index:30;pointer-events:none}
.top>*{pointer-events:auto}
.brand{display:flex;align-items:center;gap:10px;padding:5px 14px 5px 5px;border-radius:15px;background:var(--glass);border:1px solid var(--line);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);text-align:left;transition:border-color .2s}
.brand:hover{border-color:var(--line2)}
.brand img{width:34px;height:34px;border-radius:10px;display:block;box-shadow:0 4px 16px -4px rgba(138,66,250,.7)}
.brand .nm{display:block;font-family:var(--display);font-weight:800;font-size:14.5px;line-height:1.15;letter-spacing:-.01em}
.brand small{display:block;font-size:11px;color:var(--muted);line-height:1.2;font-family:var(--display);font-weight:600}
.pm{font-family:var(--display);font-weight:800;letter-spacing:-.03em;color:var(--text)}
.brand small .pm{background:var(--gradT);-webkit-background-clip:text;background-clip:text;color:transparent}
.ic{height:40px;min-width:40px;border-radius:13px;background:var(--glass);border:1px solid var(--line);display:inline-flex;align-items:center;justify-content:center;gap:6px;color:var(--soft);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);transition:border-color .2s,color .2s,background .2s}
.ic:hover{border-color:var(--line2);color:#fff;background:rgba(108,81,232,.18)}
.ic.wide{padding:0 12px;font-size:13px;font-weight:600;font-family:var(--display)}
/* modes bar */
.modes{position:fixed;top:calc(var(--top) + var(--sat));left:0;right:0;height:var(--modes);display:flex;align-items:center;gap:8px;padding:0 12px;z-index:29;pointer-events:none}
.modes>*{pointer-events:auto}
.seg{display:flex;gap:2px;background:var(--glass);border:1px solid var(--line);border-radius:14px;padding:4px;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}
.seg button{display:inline-flex;align-items:center;gap:7px;padding:7px 13px;border-radius:10px;font-size:13.5px;font-weight:600;color:var(--muted);white-space:nowrap;transition:color .2s,background .2s}
.seg button:hover{color:var(--text)}
.seg button.on{background:var(--grad);color:#fff;box-shadow:0 6px 20px -6px rgba(168,85,247,.75)}
.xrBtn{display:inline-flex;align-items:center;gap:7px;padding:9px 14px;border-radius:13px;font-size:13.5px;font-weight:700;font-family:var(--display);white-space:nowrap;border:1px solid var(--line);background:var(--glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}
.xrBtn.on{border-color:var(--lav);color:#fff;background:rgba(168,85,247,.28)}
.xrBtn.ar{background:var(--grad);border-color:transparent;color:#fff;box-shadow:var(--glow)}
body:not([data-mode=explore]):not([data-mode=quiz]):not([data-mode=lesson]) .modes{display:none}
@media(max-width:420px){.seg button{padding:7px 9px;gap:5px;font-size:13px}.xrBtn{padding:9px 11px}.top{padding:0 10px}.modes{padding:0 10px}}
@media(max-width:350px){.seg button svg{display:none}}
/* landing */
#landing{position:fixed;inset:0;z-index:28;display:flex;flex-direction:column;justify-content:space-between;gap:14px;padding:calc(var(--top) + var(--sat) + 8px) 16px calc(14px + var(--sab));pointer-events:none;overflow:auto;scrollbar-width:none;background:linear-gradient(180deg,rgba(11,10,26,.72) 0%,rgba(11,10,26,0) 30%,rgba(11,10,26,0) 46%,rgba(11,10,26,.92) 70%)}
#landing::-webkit-scrollbar{display:none}
#landing>*{pointer-events:auto}
.hero,.lower{display:flex;flex-direction:column;gap:12px}
.eyebrow{display:inline-flex;align-self:flex-start;align-items:center;gap:8px;padding:6px 12px 6px 10px;border-radius:999px;border:1px solid var(--line2);background:rgba(108,81,232,.14);font-size:12px;font-weight:600;color:var(--lav2);backdrop-filter:blur(8px)}
.eyebrow i{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 0 rgba(16,185,129,.6);animation:ping 2s infinite}
@keyframes ping{0%{box-shadow:0 0 0 0 rgba(16,185,129,.55)}70%,100%{box-shadow:0 0 0 7px rgba(16,185,129,0)}}
h1{font-family:var(--display);font-weight:800;font-size:clamp(30px,min(5.4vw,7.4vh),60px);margin:0;line-height:1.18;max-width:640px}
h1:lang(en){letter-spacing:-.025em;line-height:1.08}
h1 .g{display:inline-block;background:var(--gradT);-webkit-background-clip:text;background-clip:text;color:transparent;padding-bottom:.08em}
.lead{color:var(--muted);max-width:520px;line-height:1.7;font-size:15.5px;margin:0}
.ctas{display:grid;gap:10px;grid-template-columns:1fr 1fr;max-width:560px}
.cta{display:flex;align-items:center;gap:12px;padding:12px;border-radius:18px;background:var(--glass);border:1px solid var(--line);text-align:left;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);transition:transform .15s,border-color .2s,background .2s;min-width:0}
.cta:hover{border-color:var(--line2);background:rgba(108,81,232,.16)}
.cta:active{transform:scale(.98)}
.cta .em{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;flex:none;background:rgba(108,81,232,.2);color:var(--lav2);border:1px solid var(--line)}
.cta .tx{min-width:0;flex:1}
.cta b{display:block;font-size:15px;font-weight:700;line-height:1.3}
.cta .tx span{display:block;font-size:12px;color:var(--muted);line-height:1.4;margin-top:1px}
.cta.hot{grid-column:1/-1;padding:14px 16px 14px 14px;background:var(--grad);border-color:transparent;color:#fff;box-shadow:var(--glow),0 14px 34px -14px rgba(168,85,247,.7)}
.cta.hot:hover{filter:brightness(1.08)}
.cta.hot .em{width:46px;height:46px;background:rgba(255,255,255,.18);color:#fff;border-color:rgba(255,255,255,.25)}
.cta.hot b{font-size:17px}.cta.hot .tx span{color:rgba(255,255,255,.85)}
.cta .go{flex:none;opacity:.9;transition:transform .2s}.cta:hover .go{transform:translateX(3px)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;max-width:560px}
.stat{padding:10px 10px 9px;border-radius:14px;background:var(--glass2);border:1px solid var(--line);backdrop-filter:blur(8px)}
.stat b{display:block;font-family:var(--display);font-weight:800;font-size:20px;line-height:1.1;background:var(--gradT);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat b svg{color:var(--lav)}
.stat span{display:block;font-size:11.5px;color:var(--muted);line-height:1.35;margin-top:3px}
.mods{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;max-width:640px}
.mods::-webkit-scrollbar{display:none}
.chip{flex:none;padding:6px 12px;border-radius:999px;border:1px solid var(--line);font-size:12px;color:var(--muted);background:rgba(11,10,26,.55)}
.chip.live{color:var(--text);border-color:rgba(16,185,129,.6);background:rgba(16,185,129,.1)}
.chip.live:before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--ok);margin-right:7px;vertical-align:1px}
.partners{display:flex;align-items:center;flex-wrap:wrap;gap:6px 10px;font-size:12.5px;color:var(--soft);font-weight:500}
.partners .lbl{color:var(--muted);font-size:11.5px}
.partners img{width:22px;height:22px;border-radius:7px;display:block}
.partners .pmw{display:inline-flex;align-items:center;gap:7px}
.partners .pmw .pm{font-size:15px}
.partners .x{color:var(--muted);opacity:.6}
.foot{font-size:11px;color:var(--muted);margin:0;line-height:1.6;max-width:600px;opacity:.85}
html:not(.rail) .stats{display:none}
@media(min-height:860px){html:not(.rail) .stats{display:grid}}
@media(max-height:740px){html:not(.rail) #landing .foot,html:not(.rail) #landing .mods{display:none}html:not(.rail) .lead{font-size:14.5px;line-height:1.6}}
@media(max-height:720px){html:not(.rail) .cta .tx span{display:none}html:not(.rail) .lead{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}}
html.rail #landing{justify-content:center;gap:22px;padding:calc(var(--top) + var(--sat) + 16px) 24px 28px clamp(20px,5.5vw,84px);background:linear-gradient(90deg,rgba(11,10,26,.8) 0%,rgba(11,10,26,.45) 38%,rgba(11,10,26,0) 58%)}
html.rail .hero,html.rail .lower{max-width:min(580px,48vw)}
html.rail .hero{gap:16px}html.rail .lower{gap:14px}
@media(max-height:540px){html.rail #landing{justify-content:flex-start;gap:12px;padding-top:calc(var(--top) + 6px)}html.rail .stats,html.rail #landing .mods,html.rail #landing .foot{display:none}html.rail .lead{font-size:13.5px;line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}html.rail .cta .tx span{display:none}html.rail .cta{padding:9px}html.rail .cta .em{width:34px;height:34px}html.rail .cta.hot .em{width:38px;height:38px}html.rail .hero{gap:10px}}
/* panel: bottom sheet (portrait phone, tablet portrait) or right rail (desktop, landscape phone) */
.panel{position:fixed;z-index:25;background:var(--glassS);backdrop-filter:blur(22px) saturate(140%);-webkit-backdrop-filter:blur(22px) saturate(140%);border:1px solid var(--line);display:flex;flex-direction:column;box-shadow:var(--shadow)}
body:not([data-mode=explore]) .panel{display:none}
.peek{display:flex;align-items:center;gap:10px;padding:16px 14px 8px;height:var(--peek);cursor:pointer}
.peek .nm{flex:1;min-width:0}
.peek b{display:block;font-size:15.5px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.peek small{display:block;color:var(--lav2);font-size:11.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.handle{position:absolute;top:7px;left:50%;width:42px;height:4px;border-radius:2px;background:rgba(196,181,253,.35);transform:translateX(-50%)}
.chev{transition:transform .25s;color:var(--muted);display:grid;place-items:center;width:32px;height:32px;border-radius:10px;background:var(--glass2)}
.panel.open .chev{transform:rotate(180deg)}
.tabs{display:flex;gap:4px;margin:4px 12px 0;padding:4px;background:rgba(196,181,253,.06);border:1px solid var(--line);border-radius:13px}
.tabs button{flex:1;padding:8px 0;border-radius:9px;font-size:13px;font-weight:600;color:var(--muted);transition:background .2s,color .2s}
.tabs button.on{background:rgba(108,81,232,.28);color:#fff;box-shadow:inset 0 0 0 1px rgba(196,181,253,.3)}
.tab{display:none;overflow:auto;padding:12px 14px calc(14px + var(--sab));flex:1;scrollbar-width:thin;scrollbar-color:rgba(196,181,253,.25) transparent}
.tab.on{display:block}
html:not(.rail) .panel{left:0;right:0;bottom:0;border-radius:24px 24px 0 0;border-bottom:0;height:min(64dvh,580px);transform:translateY(calc(100% - var(--peek) - var(--sab)));transition:transform .32s cubic-bezier(.2,.8,.2,1)}
html:not(.rail) .panel.open{transform:none}
@media(min-width:600px){html:not(.rail) .panel{left:50%;right:auto;width:min(620px,100%);margin-left:max(-310px,-50%)}}
html.rail .panel{top:calc(var(--top) + var(--modes) + var(--sat) + 6px);right:12px;bottom:12px;width:calc(var(--panelW) - 24px);border-radius:22px}
html.rail .peek,html.rail .handle{display:none}
html.rail .tabs{margin-top:12px}
/* parts list */
.lay{display:flex;align-items:center;gap:10px;padding:10px 4px 6px;font-size:12px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;cursor:pointer}
.lay:lang(bn){text-transform:none;letter-spacing:0;font-size:13px}
.lay input{accent-color:var(--violet2);width:16px;height:16px;margin:0}
.sw{width:10px;height:10px;border-radius:3px;flex:none}
.parts{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin:0 0 6px}
.parts button{display:flex;align-items:center;gap:8px;text-align:left;font-size:12.5px;color:var(--soft);padding:9px 10px;border-radius:12px;background:var(--glass2);border:1px solid var(--line);line-height:1.3;transition:border-color .2s,background .2s;min-width:0}
.parts button:hover{border-color:var(--line2);background:rgba(108,81,232,.12)}
.parts button span{min-width:0;overflow:hidden;text-overflow:ellipsis}
.parts .dot{width:10px;height:10px;border-radius:50%;flex:none;box-shadow:0 0 0 3px rgba(255,255,255,.06),0 0 10px -2px currentColor}
.parts button.sel{color:#fff;background:linear-gradient(#251d47,#251d47) padding-box,var(--grad) border-box;border-color:transparent}
/* info */
.nmBig{font-family:var(--display);font-size:22px;font-weight:700;line-height:1.35}
.nmSub{color:var(--lav2);font-size:13px;margin-top:2px;font-weight:500}
.desc{font-size:14.5px;line-height:1.75;color:var(--soft);margin:10px 0 12px}
/* tools */
.row{display:flex;flex-wrap:wrap;gap:8px}
.btn{padding:9px 13px;border-radius:12px;background:var(--glass2);border:1px solid var(--line);font-size:13px;font-weight:500;display:inline-flex;align-items:center;gap:7px;line-height:1.2;transition:border-color .2s,background .2s,color .2s}
.btn svg.i{width:16px;height:16px}
.btn:hover{border-color:var(--line2);background:rgba(108,81,232,.14)}
.btn.primary{background:var(--grad);border-color:transparent;color:#fff;box-shadow:0 8px 22px -10px rgba(168,85,247,.8);font-weight:600}
.btn.on{background:rgba(108,81,232,.26);border-color:rgba(168,85,247,.75);color:#fff}
.btn.sm{padding:7px 10px;font-size:12px}
.lab{font-size:12px;color:var(--muted);margin:16px 0 4px;display:flex;justify-content:space-between;font-weight:500}
.lab b{color:var(--text);font-family:var(--display)}
input[type=range]{width:100%;accent-color:var(--violet2);margin:4px 0}
#ecg{width:100%;height:64px;border-radius:12px;background:#0d0b1f;border:1px solid var(--line);display:block}
.hint{font-size:11.5px;color:var(--muted);line-height:1.6;margin:6px 0 0}
/* caption */
.caption{position:absolute;left:50%;transform:translateX(-50%);bottom:18px;max-width:680px;width:calc(100% - 28px);text-align:center;background:rgba(15,13,32,.82);border:1px solid var(--line);border-radius:14px;padding:10px 16px;font-size:15px;line-height:1.6;z-index:6;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
html:not(.rail) .caption{bottom:calc(var(--peek) + var(--sab) + 12px);font-size:14px}
/* lesson / quiz cards */
.card{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(12px + var(--sab));width:min(680px,calc(100% - 20px));background:var(--glassS);backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px);border:1px solid var(--line);border-radius:22px;padding:14px 16px 12px;z-index:26;box-shadow:var(--shadow),var(--glow)}
.card .kicker{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--lav2);margin-bottom:8px;font-weight:600}
.prog{height:4px;border-radius:2px;background:rgba(196,181,253,.14);overflow:hidden;margin-bottom:10px}
.prog i{display:block;height:100%;background:var(--grad);width:0;transition:width .4s}
.card h2{margin:0 0 6px;font-family:var(--display);font-size:19px;line-height:1.35;font-weight:700}
.card p{margin:0;font-size:14.5px;line-height:1.7;color:var(--soft);max-height:34dvh;overflow:auto}
.ctl{display:flex;gap:8px;margin-top:12px;align-items:center}
.ctl .spacer{flex:1}
#lsPlay{min-width:54px;justify-content:center}
.score{font-weight:700;color:var(--ok)}
.fb{margin-top:8px;font-size:14px;font-weight:700;min-height:20px}
.fb.ok{color:var(--ok)}.fb.bad{color:var(--bad)}
html.rail body[data-mode=lesson] .card,html.rail body[data-mode=quiz] .card{left:auto;right:16px;transform:none;bottom:16px;width:min(420px,40vw)}
@media(max-height:540px){html.rail body[data-mode=lesson] .card,html.rail body[data-mode=quiz] .card{width:min(360px,46vw);padding:10px 12px;top:calc(var(--top) + var(--modes) + 6px);bottom:10px;overflow:auto}.card h2{font-size:16px}.card p{font-size:13px;max-height:none}}
/* AR overlay */
#arUI{position:fixed;inset:0;z-index:40;display:flex;flex-direction:column;justify-content:space-between;pointer-events:none;padding:12px;padding-bottom:calc(12px + var(--sab))}
#arUI .bar{pointer-events:auto}
.arTop{padding:10px 14px;border-radius:16px;background:var(--glassS);border:1px solid var(--line);font-size:14px;text-align:center;backdrop-filter:blur(12px);line-height:1.5}
.arTop b{color:var(--lav2)}
.arBot{padding:12px;border-radius:20px;background:var(--glassS);border:1px solid var(--line);display:grid;gap:10px;backdrop-filter:blur(12px)}
.arName{text-align:center;font-weight:700;font-size:16px;min-height:22px}
.arName small{display:block;font-weight:400;color:var(--lav2);font-size:12px}
.arRow{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.arRow.arMain .btn{flex:1 1 0;min-width:0;justify-content:center;padding:10px 6px;font-size:13px;flex-direction:column;gap:3px;border-radius:14px}
.arRow.arMain .btn.on{background:var(--grad);border-color:transparent;color:#fff}
#arUI:not(.placed) .arMain{display:none}
.arRow:not(.arMain){gap:6px}.arRow:not(.arMain) .btn{padding:8px 10px;font-size:13px;min-height:38px}
.arTop small{display:block;color:var(--soft);font-size:12px;margin-top:2px}
#camFeed{position:fixed;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
body.camOn #view{background:linear-gradient(180deg,rgba(11,10,26,.35),rgba(11,10,26,0) 30%,rgba(11,10,26,0) 70%,rgba(11,10,26,.4))}
/* modals */
.modal{position:fixed;inset:0;z-index:60;background:rgba(6,5,16,.78);display:grid;place-items:center;padding:16px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.box{width:min(520px,100%);background:linear-gradient(180deg,#1a1633,#121025);border:1px solid var(--line2);border-radius:24px;padding:22px;max-height:92dvh;overflow:auto;box-shadow:var(--shadow),var(--glow)}
.box h2{margin:0 0 6px;font-family:var(--display);font-size:21px;font-weight:800}
.box p{color:var(--soft);line-height:1.7;font-size:14px;margin:6px 0}
.qr{background:#fff;padding:12px;border-radius:16px;width:fit-content;margin:14px auto 6px;box-shadow:0 0 0 6px rgba(168,85,247,.25)}
.qr svg{display:block;width:230px;height:230px}
.url{font-size:12px;color:var(--lav2);text-align:center;word-break:break-all}
.help{display:grid;gap:10px;margin-top:12px}
.help div{background:var(--glass2);border:1px solid var(--line);border-radius:16px;padding:12px 14px}
.help b{display:flex;align-items:center;gap:8px;margin-bottom:4px}
.help b svg{color:var(--lav)}
.help span{font-size:13.5px;color:var(--soft);line-height:1.65}
.box .by{display:flex;align-items:center;gap:8px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}
.box .by img{width:20px;height:20px;border-radius:6px}
.big{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:16px;border-radius:16px;background:var(--grad);color:#fff;font-weight:700;font-size:18px;margin-top:14px;box-shadow:var(--glow)}
.toast{position:fixed;left:50%;top:calc(var(--top) + var(--sat) + 8px);transform:translateX(-50%);background:#1b1835;border:1px solid var(--line2);padding:10px 16px;border-radius:12px;font-size:13px;z-index:70;max-width:calc(100% - 32px);text-align:center;box-shadow:var(--shadow)}
.drop{position:fixed;inset:0;border:3px dashed var(--lav);background:rgba(108,81,232,.12);display:grid;place-items:center;font-size:20px;z-index:45;pointer-events:none}
html:not(.rail) .brand small{display:none}
@media(max-width:380px){html:not(.rail) .brand .nm{font-size:13.5px}}
/* splash */
#splash{position:fixed;inset:0;z-index:90;background:radial-gradient(45% 38% at 50% 46%,rgba(91,52,220,.4),transparent 70%),var(--bg);display:grid;place-items:center;transition:opacity .6s}
#splash.out{opacity:0;pointer-events:none}
#splash .sp{text-align:center}
#splash img{width:84px;height:84px;border-radius:24px;display:block;margin:0 auto;animation:pulse 1.1s ease-in-out infinite;box-shadow:0 0 70px -6px rgba(168,85,247,.75)}
#splash h3{font-family:var(--display);font-weight:800;font-size:22px;margin:20px 0 2px;letter-spacing:-.01em}
#splash p{color:var(--muted);font-size:12.5px;margin:0;font-family:var(--display);font-weight:600}
#splash .bar{width:200px;height:4px;border-radius:4px;background:rgba(196,181,253,.15);margin:20px auto 8px;overflow:hidden}
#splash .bar i{display:block;height:100%;width:6%;background:var(--grad);transition:width .25s;border-radius:4px}
#splash small{display:block;color:var(--muted);font-size:11.5px;opacity:.8}
@keyframes pulse{0%,100%{transform:scale(1)}14%{transform:scale(1.1)}28%{transform:scale(1)}42%{transform:scale(1.06)}}
body[data-mode=landing] #landing .hero>*,body[data-mode=landing] #landing .lower>*{animation:up .7s cubic-bezier(.2,.8,.2,1) both}
#landing .eyebrow{animation-delay:.05s}#landing h1{animation-delay:.12s}#landing .lead{animation-delay:.2s}#landing .ctas{animation-delay:.28s}#landing .stats{animation-delay:.34s}#landing .mods{animation-delay:.4s}#landing .partners{animation-delay:.46s}#landing .foot{animation-delay:.52s}
@keyframes up{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.dots{display:flex;gap:6px;margin:0 0 10px}
.dots i{width:9px;height:9px;border-radius:50%;background:rgba(196,181,253,.2);cursor:pointer;transition:background .2s,width .2s}
.dots i.done{background:rgba(168,85,247,.55)}.dots i.on{width:22px;border-radius:5px;background:var(--grad);box-shadow:0 0 10px rgba(168,85,247,.7)}
#lessonCard .prog{display:none}
#confetti{position:fixed;inset:0;z-index:27;pointer-events:none}
.credit{position:fixed;left:14px;bottom:calc(8px + var(--sab));font-size:10.5px;color:var(--muted);opacity:.7;z-index:5;pointer-events:none;max-width:50vw}
html:not(.rail) .credit,body[data-mode=landing] .credit{display:none}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ---------- Anatoo additions: system bar, search, tiers, info sections ---------- */
.sysbar{position:fixed;left:0;right:0;top:calc(var(--sat) + var(--top) + var(--modes) + 2px);z-index:6;display:flex;gap:8px;padding:4px 14px;overflow-x:auto;scrollbar-width:none;pointer-events:none}
.sysbar::-webkit-scrollbar{display:none}
.sysbar>*{pointer-events:auto}
body[data-mode=landing] .sysbar,body[data-xr] .sysbar{display:none}
html.rail .sysbar{right:calc(var(--panelW) + 12px)}
.chipBtn{flex:0 0 auto;padding:7px 13px;border-radius:999px;border:1px solid var(--line2);background:var(--glassS);color:var(--soft);font:inherit;font-size:13px;font-weight:600;cursor:pointer;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
.chipBtn.on{background:var(--grad);border-color:transparent;color:#fff;box-shadow:var(--glow)}
.chip.live{cursor:pointer}
.searchRow{position:relative;margin:2px 0 12px;display:flex;align-items:center}
.searchRow>.i{position:absolute;left:13px;color:var(--muted);pointer-events:none}
#search{width:100%;padding:11px 44px 11px 38px;border-radius:14px;border:1px solid var(--line2);background:var(--glass2);color:var(--text);font:inherit;font-size:15px;outline:none;-webkit-appearance:none;appearance:none}
#search:focus{border-color:var(--violet2);box-shadow:0 0 0 3px rgba(168,85,247,.18)}
#search::-webkit-search-cancel-button{display:none}
#searchClear{position:absolute;right:6px}
#searchOut .parts button small{display:block;font-size:11px;color:var(--muted);font-weight:400;margin-top:1px}
.lay small{color:var(--muted);margin-left:6px;font-weight:500;font-size:11px}
body[data-beat="0"] .beatOnly{display:none!important}
body[data-tier=kid] .proOnly{display:none}
body[data-tier=kid] .parts button{font-size:15px;padding:10px 12px}
body[data-tier=kid] .desc{font-size:16px;line-height:1.6}
.infoSec{margin-top:12px}
.infoSec h4{margin:0 0 3px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--lav2);font-family:var(--display)}
.review{display:flex;align-items:center;gap:6px;font-size:11px;color:var(--warn);margin:12px 0 0;opacity:.9}
body.loading #view{opacity:.55;transition:opacity .3s}
#tierBtn span{font-weight:700}