:root{--tabh:0px;--navy:#023173;--navy2:#0b3f8c;--navy-d:#01224f;--gold:#FBC005;--gold-d:#d9a400;--ink:#14213d;--mut:#5b6478;--line:#e3e7ef;--bg:#f6f8fc;--ok:#13804b;--okb:#e7f6ee;--bad:#c62828;--badb:#fdecec;--r:14px;--sh:0 1px 2px rgba(2,49,115,.06),0 6px 20px rgba(2,49,115,.07)}
@font-face{font-family:"Montserrat";src:url("/a/fonts/montserrat-var.woff2") format("woff2");font-weight:100 900;font-display:swap}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:Montserrat,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--card);line-height:1.5;font-size:16px}
a{color:var(--hd)}img{max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px;border-radius:6px}
.skip{position:absolute;left:-999px;top:0;background:var(--gold);color:var(--hd);padding:8px 12px;z-index:99}.skip:focus{left:8px}
header.top{position:sticky;top:0;z-index:30;background:var(--navy);border-bottom:3px solid var(--gold)}
.top .in{max-width:1180px;margin:0 auto;display:flex;align-items:center;gap:14px;padding:8px 16px;min-height:60px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:#fff}.brand .wm{display:flex;flex-direction:column;gap:3px;width:132px}.brand .wm img,.brand .wm svg{display:block;width:132px;height:auto}
.brand img.em{width:44px;height:36px;object-fit:contain}
.brand .tag{font-size:11px;font-weight:700;color:var(--hd);background:var(--gold);border-radius:999px;padding:2px 8px;letter-spacing:.06em}
nav.main{margin-left:auto;display:flex;gap:4px}
nav.main a{text-decoration:none;color:#fff;font-weight:600;font-size:14px;padding:8px 12px;border-radius:10px}
nav.main a[aria-current=page]{background:var(--gold);color:var(--hd)}
nav.main a:hover{background:rgba(255,255,255,.12)}nav.main a[aria-current=page]:hover{background:var(--gold)}
.tabbar{display:none}
main{max-width:1180px;margin:0 auto;padding:18px 16px 96px;min-height:70vh}
.view{animation:vin .28s ease backwards}@keyframes vin{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
h1,h2,h3{line-height:1.2;color:var(--hd);margin:0 0 .5em}h1{font-size:clamp(26px,5vw,40px);font-weight:800}h2{font-size:clamp(20px,3.4vw,26px);font-weight:800}h3{font-size:17px;font-weight:700}
p{margin:0 0 .8em}.mut{color:var(--mut)}.small{font-size:13px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:12px 18px;font-weight:700;font-size:15px;cursor:pointer;text-decoration:none;background:var(--navy);color:#fff;transition:transform .12s ease,background .2s,box-shadow .2s;min-height:46px}
.btn:hover{background:var(--navy2)}.btn:active{transform:scale(.97)}
.btn.gold{background:var(--gold);color:var(--hd)}.btn.gold:hover{background:#ffcd2e}
.btn.ghost{background:var(--card);color:var(--hd);box-shadow:inset 0 0 0 2px var(--navy)}.btn.ghost:hover{background:var(--soft)}
.btn.link{background:none;color:var(--hd);padding:8px;min-height:0;text-decoration:underline}
.btn.sm{padding:8px 12px;min-height:36px;font-size:13px;border-radius:10px}
.btn[disabled]{opacity:.55;cursor:not-allowed}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.grid{display:grid;gap:14px}.g2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.g3{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}.g4{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px;box-shadow:var(--sh)}
.card.navy{background:var(--navy);color:#fff;border-color:var(--hd)}.card.navy h2,.card.navy h3{color:#fff}
.hero{position:relative;overflow:hidden;border-radius:20px;background:linear-gradient(135deg,var(--navy) 0%,#04429a 60%,#0a56c2 100%);color:#fff;padding:28px 20px;margin-bottom:18px}
.hero h1{color:#fff}.hero p{color:#dbe6ff;max-width:560px}
.hero .gl{position:absolute;right:-60px;top:-60px;width:260px;height:260px;border-radius:50%;background:radial-gradient(circle,rgba(251,192,5,.45),rgba(251,192,5,0) 65%);animation:float 9s ease-in-out infinite}
.hero .gl2{position:absolute;left:-80px;bottom:-110px;width:280px;height:280px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.18),rgba(255,255,255,0) 65%);animation:float 11s ease-in-out infinite reverse}
@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(-18px,14px)}}
.hero .sym{position:absolute;right:16px;bottom:10px;font-weight:800;font-size:13px;color:rgba(255,255,255,.22);letter-spacing:.08em}
.stat{font-size:28px;font-weight:800;color:var(--hd);line-height:1}.stat+div{font-size:13px;color:var(--mut);margin-top:4px}
.pill{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:700;border-radius:999px;padding:3px 10px;background:var(--soft);color:var(--hd)}
.pill.gold{background:var(--goldsoft);color:#7a5b00}.pill.ok{background:var(--okb);color:var(--ok)}.pill.bad{background:var(--badb);color:var(--bad)}
label{font-weight:600;font-size:14px;display:block;margin:0 0 6px}
input[type=text],input[type=email],input[type=tel],input[type=password],input[type=number],select,textarea{width:100%;border:1.5px solid var(--fline);border-radius:12px;padding:11px 12px;background:var(--card);min-height:46px}
input:focus,select:focus,textarea:focus{border-color:var(--hd);outline:none;box-shadow:0 0 0 3px rgba(251,192,5,.45)}
.field{margin-bottom:14px}.hint{font-size:12px;color:var(--mut);margin-top:4px}
.err{background:var(--badb);color:var(--bad);border-radius:10px;padding:10px 12px;font-size:14px;margin:8px 0}
.okmsg{background:var(--okb);color:var(--ok);border-radius:10px;padding:10px 12px;font-size:14px;margin:8px 0}
.seg{display:flex;background:var(--soft);border-radius:12px;padding:4px;gap:4px;flex-wrap:wrap}
.seg button{flex:1;border:0;background:none;border-radius:9px;padding:10px 12px;font-weight:700;font-size:14px;cursor:pointer;color:var(--hd);min-width:90px}
.seg button[aria-pressed=true]{background:var(--navy);color:#fff;box-shadow:var(--sh)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1.5px solid var(--fline);background:var(--card);border-radius:999px;padding:8px 14px;font-weight:600;font-size:14px;cursor:pointer;transition:all .15s}
.chip[aria-pressed=true]{background:var(--navy);border-color:var(--hd);color:#fff}.chip[disabled]{opacity:.5;cursor:not-allowed}
.chip .n{font-weight:500;opacity:.7;font-size:12px;margin-left:4px}
.tbl{width:100%;border-collapse:collapse;font-size:14px}.tbl th,.tbl td{text-align:left;padding:9px 8px;border-bottom:1px solid var(--line);vertical-align:top}.tbl th{font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--mut)}
.scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
/* exam */
.exam{display:grid;grid-template-columns:1fr 300px;gap:16px;align-items:start}
.ebar{position:sticky;top:63px;z-index:20;background:var(--card);border-bottom:1px solid var(--line);margin:-18px -16px 14px;padding:10px 16px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.timer{font-variant-numeric:tabular-nums;font-weight:800;font-size:18px;color:var(--hd);background:var(--goldsoft);border-radius:10px;padding:6px 12px;min-width:92px;text-align:center}
.timer.low{background:var(--badb);color:var(--bad);animation:pulse 1s ease-in-out infinite}@keyframes pulse{50%{transform:scale(1.05)}}
.stabs{display:flex;gap:6px;overflow-x:auto;flex:1}.stabs button{border:0;background:var(--soft);color:var(--hd);border-radius:10px;padding:8px 12px;font-weight:700;font-size:13px;white-space:nowrap;cursor:pointer}.stabs button[aria-pressed=true]{background:var(--navy);color:#fff}
.qcard{padding:18px}
.refs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.ref{font-size:12px;font-weight:700;border-radius:8px;padding:4px 9px;background:var(--navy);color:#fff}.ref.y{background:var(--gold);color:var(--hd)}.ref.n{background:var(--soft);color:var(--hd)}.ref.t{background:var(--card);color:var(--hd);box-shadow:inset 0 0 0 1.5px var(--navy)}
.qno{font-size:13px;font-weight:700;color:var(--mut);margin-bottom:6px}
.qtext{font-size:17px;line-height:1.6;margin-bottom:14px;overflow-x:auto}.qtext p{margin:0 0 .6em}.qtext table{border-collapse:collapse;margin:6px 0}.qtext td,.qtext th{border:1px solid var(--fline);padding:4px 8px}
.passage{background:var(--mist);border-left:4px solid var(--gold);border-radius:8px;padding:12px 14px;margin-bottom:12px;font-size:15px;max-height:300px;overflow:auto}
.passage summary{font-weight:700;color:var(--hd);cursor:pointer}
.qimg{display:block;margin:8px 0 14px;max-height:340px;border-radius:8px;border:1px solid var(--line);background:var(--card)}
.opts{display:grid;gap:10px}
.opt{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;border:1.5px solid var(--fline);background:var(--card);border-radius:12px;padding:12px 14px;cursor:pointer;font-size:16px;transition:border-color .15s,background .15s,transform .1s}
.opt:hover{border-color:var(--hd)}.opt:active{transform:scale(.99)}
.opt .L{flex:none;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-weight:800;background:var(--soft);color:var(--hd);font-size:14px}
.opt[aria-pressed=true]{border-color:var(--hd);background:var(--soft2)}.opt[aria-pressed=true] .L{background:var(--navy);color:#fff}
.opt.right{border-color:var(--ok);background:var(--okb)}.opt.right .L{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--badb)}.opt.wrong .L{background:var(--bad);color:#fff}
.opt .tx{flex:1;min-width:0;overflow-x:auto}.opt .tx p{margin:0}
.enav{display:flex;gap:8px;margin-top:16px;flex-wrap:wrap}.enav .sp{flex:1}
.flagbtn[aria-pressed=true]{background:var(--gold);color:var(--hd);box-shadow:none}
.pal{position:sticky;top:130px}
.palg{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px;max-height:50vh;overflow:auto;padding:2px}
.palg button{height:38px;border-radius:9px;border:1.5px solid var(--fline);background:var(--card);font-weight:700;font-size:13px;cursor:pointer;position:relative}
.palg button.ans{background:var(--navy);color:#fff;border-color:var(--hd)}.palg button.cur{outline:3px solid var(--gold);outline-offset:1px}
.palg button.fl::after{content:"";position:absolute;top:3px;right:3px;width:8px;height:8px;border-radius:50%;background:var(--gold)}
.palg button.r{background:var(--ok);border-color:var(--ok);color:#fff}.palg button.w{background:var(--bad);border-color:var(--bad);color:#fff}
.legend{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--mut);margin-top:10px}.legend i{display:inline-block;width:12px;height:12px;border-radius:3px;vertical-align:-2px;margin-right:4px;border:1.5px solid var(--fline)}
.kbd{font-size:12px;color:var(--mut);margin-top:10px}.kbd b{display:inline-block;min-width:20px;text-align:center;border:1px solid var(--fline);border-bottom-width:2px;border-radius:5px;padding:0 4px;margin:0 2px;color:var(--ink);background:var(--card)}
.paltoggle{display:none}
/* tutor */
.tutor{margin-top:16px;border:1.5px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--card)}
.tutor .th{background:linear-gradient(90deg,var(--navy),#0a4aa6);color:#fff;padding:10px 14px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.tutor .th b{font-size:15px}.tutor .th .sp{flex:1}
.verdict{font-weight:800;font-size:16px;padding:12px 14px}.verdict.ok{background:var(--okb);color:var(--ok)}.verdict.bad{background:var(--badb);color:var(--bad)}
.tb{padding:12px 14px}
.steps{list-style:none;margin:0 0 10px;padding:0;counter-reset:s}
.steps li{counter-increment:s;position:relative;padding:10px 12px 10px 44px;border-radius:10px;margin-bottom:8px;background:var(--mist);animation:vin .3s ease both;transition:background .3s,box-shadow .3s}
.steps li::before{content:counter(s);position:absolute;left:10px;top:9px;width:24px;height:24px;border-radius:50%;background:var(--gold);color:var(--hd);font-weight:800;font-size:13px;display:grid;place-items:center}
.steps li.speak{background:var(--goldsoft);box-shadow:inset 3px 0 0 var(--gold)}
.concept{font-weight:600;margin-bottom:10px}
.take{background:var(--goldsoft);border-radius:10px;padding:10px 12px;margin:10px 0;font-size:15px}.take b{color:var(--hd)}
.whys{margin:8px 0;padding:0;list-style:none}.whys li{padding:6px 0;border-bottom:1px dashed var(--line);font-size:15px}.whys li b{color:var(--hd)}
.chat{border-top:1px solid var(--line);padding:12px 14px;background:var(--mist)}
.msgs{display:flex;flex-direction:column;gap:8px;margin-bottom:10px;max-height:340px;overflow:auto}
.msg{max-width:88%;padding:9px 12px;border-radius:14px;font-size:15px;animation:vin .25s ease both}
.msg.u{align-self:flex-end;background:var(--navy);color:#fff;border-bottom-right-radius:4px}
.msg.t{align-self:flex-start;background:var(--card);border:1px solid var(--line);border-bottom-left-radius:4px}
.msg .src{font-size:11px;color:var(--mut);margin-top:6px}
.ask{display:flex;gap:8px}.ask input{flex:1}
.mic{width:46px;flex:none;padding:0}.mic.on{background:var(--bad);animation:pulse 1s infinite}
.qchips{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:8px}.qchips button{font-size:13px;padding:6px 10px;border-radius:999px;border:1.5px solid var(--fline);background:var(--card);cursor:pointer;font-weight:600}
.voice{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.voice .bar{flex:1;min-width:80px;height:5px;background:rgba(255,255,255,.3);border-radius:3px;overflow:hidden}.voice .bar i{display:block;height:100%;width:0;background:var(--gold);transition:width .2s linear}
.vt{display:inline-flex;background:rgba(255,255,255,.18);border-radius:999px;padding:2px}.vt button{border:0;background:none;color:#fff;font-weight:700;font-size:12px;padding:5px 10px;border-radius:999px;cursor:pointer}.vt button[aria-pressed=true]{background:var(--gold);color:var(--hd)}
/* results */
.ring{width:150px;height:150px}.ring circle{fill:none;stroke-width:12}.ring .bg{stroke:var(--soft)}.ring .fg{stroke:var(--gold);stroke-linecap:round;transform:rotate(-90deg);transform-origin:50% 50%;transition:stroke-dashoffset 1.1s cubic-bezier(.2,.8,.2,1)}
.ring text{font-weight:800;fill:var(--navy)}
.bars .b{margin-bottom:10px}.bars .b .t{display:flex;justify-content:space-between;font-size:14px;font-weight:600}.bars .track{height:10px;border-radius:6px;background:var(--soft);overflow:hidden;margin-top:4px}.bars .track i{display:block;height:100%;background:var(--navy);border-radius:6px;transform-origin:left;animation:grow .9s cubic-bezier(.2,.8,.2,1) both}
.bars .track i.weak{background:var(--bad)}.bars .track i.mid{background:var(--gold)}
@keyframes grow{from{transform:scaleX(0)}}
.rv{margin-bottom:12px}.rv .yours{font-size:14px;margin:6px 0}
.filt{display:flex;gap:6px;flex-wrap:wrap;margin:10px 0}
details.ex>summary{cursor:pointer;font-weight:700;color:var(--hd);padding:6px 0}
.empty{text-align:center;padding:30px 10px;color:var(--mut)}
.spin{display:inline-block;width:22px;height:22px;border:3px solid var(--line);border-top-color:var(--hd);border-radius:50%;animation:sp 0.8s linear infinite;vertical-align:middle}@keyframes sp{to{transform:rotate(360deg)}}
.loading{padding:40px;text-align:center}
.toast{position:fixed;left:50%;bottom:86px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 16px;border-radius:12px;font-size:14px;z-index:90;animation:vin .25s ease both;max-width:90vw}
.modal{position:fixed;inset:0;background:rgba(1,20,50,.5);display:grid;place-items:center;z-index:80;padding:16px;animation:fade .2s ease both}@keyframes fade{from{opacity:0}}
.modal .card{max-width:440px;width:100%;animation:vin .25s ease both}
.codes{font-family:ui-monospace,Menlo,Consolas,monospace;font-weight:700;letter-spacing:.04em}
.adm-tabs{display:flex;gap:6px;overflow-x:auto;margin-bottom:14px;padding-bottom:4px}.adm-tabs a{white-space:nowrap;text-decoration:none;font-weight:700;font-size:14px;padding:8px 12px;border-radius:10px;background:var(--soft);color:var(--hd)}.adm-tabs a[aria-current=page]{background:var(--navy);color:#fff}
.bq{border:1px solid var(--line);border-radius:12px;padding:12px;margin-bottom:10px}.bq.hid{opacity:.55}
footer.f{border-top:1px solid var(--line);padding:18px 16px 90px;text-align:center;font-size:13px;color:var(--mut)}
.chart{width:100%;height:auto}.chart .ln{fill:none;stroke:var(--navy);stroke-width:2.5}.chart .dot{fill:var(--gold);stroke:var(--navy);stroke-width:2}.chart .ax{stroke:var(--line)}.chart text{font-size:10px;fill:var(--mut)}
@media (max-width:900px){.exam{grid-template-columns:minmax(0,1fr)}.paltoggle{display:none}
.pal{position:fixed;left:0;right:0;bottom:var(--tabh);top:auto;z-index:45;margin:0;padding:0 14px 12px;border-radius:18px 18px 0 0;box-shadow:0 -8px 30px rgba(2,49,115,.22);transform:translateY(calc(100% - 52px));transition:transform .28s cubic-bezier(.2,.8,.2,1);max-height:64vh;display:flex;flex-direction:column;overflow:hidden;will-change:transform}
.pal.open{transform:none}.pal .palt{display:none}.pal .palh{display:flex}
.pal .palg{max-height:calc(64vh - 150px)}
body.inexam main{padding-bottom:calc(var(--tabh) + 84px)}
body.palopen::after{content:"";position:fixed;inset:0;background:rgba(1,20,50,.35);z-index:44}}
@media (max-width:760px){nav.main{display:none}.tabbar{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:50;background:var(--card);border-top:1px solid var(--line);padding:4px 4px calc(4px + env(safe-area-inset-bottom))}
.tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;text-decoration:none;color:var(--mut);font-size:11px;font-weight:700;padding:6px 2px;border-radius:10px}
.tabbar a svg{width:22px;height:22px}.tabbar a[aria-current=page]{color:var(--hd);background:var(--soft)}
.brand .wm,.brand .wm img,.brand .wm svg{width:112px}.brand img.em{width:38px;height:31px}.top .in{min-height:54px}.ebar{top:57px}
.qtext{font-size:16px}.opt{font-size:15px}.hero{padding:22px 16px}main{padding-top:14px}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}
@media print{header.top,.tabbar,footer.f{display:none}}
.codes{white-space:nowrap}
.opt .tx .katex,.qtext .katex{font-size:1.16em}
@media (max-width:760px){.stabs{flex-basis:100%;order:-1}.ebar .timer{margin-right:auto}}
footer.f .fc{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 18px;margin:0 0 10px}footer.f .fc a{display:inline-flex;align-items:center;gap:7px;font-weight:700;color:var(--hd);text-decoration:none;padding:8px 12px;border-radius:999px;background:var(--soft)}footer.f .fc a.fcall{background:var(--navy);color:#fff}footer.f .fc a.fcall svg{color:var(--gold)}footer.f .fc a.fwa{background:var(--wasoft);color:#127a3a}
.btn .ic16{width:16px;height:16px;flex:none}
/* W47 phase 1: palette handle, readable fields, mic icon */
.palh{display:none;align-items:center;gap:10px;width:calc(100% + 28px);margin:0 -14px 10px;height:52px;padding:0 16px;border:0;background:transparent;font-weight:800;font-size:15px;color:var(--hd);cursor:pointer;border-radius:18px 18px 0 0;flex:none}
.palh::before{content:"";position:absolute;left:50%;top:6px;width:38px;height:4px;margin-left:-19px;border-radius:4px;background:var(--fline)}
.palh b{font-weight:600;font-size:12.5px;color:var(--mut);margin-left:auto}
.palh .chev{width:20px;height:20px;transition:transform .25s}.pal.open .palh .chev{transform:rotate(180deg)}
input,select,textarea{color:var(--ink);background-color:var(--field)}
input::placeholder,textarea::placeholder{color:var(--mut);opacity:1}
::selection{background:var(--gold);color:var(--hd)}
input::selection,textarea::selection{background:var(--gold);color:var(--hd)}
option,optgroup{color:var(--ink);background:var(--card)}
.tutor .th .tsl{margin:0;color:#fff;font-size:13px;font-weight:700}
.tutor .th select.tsel{width:auto;max-width:min(260px,100%);min-height:40px;padding:6px 36px 6px 12px;border:2px solid var(--gold);border-radius:12px;background:var(--card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23023173' stroke-width='2.5' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat right 10px center/18px;color:var(--hd);font-weight:700;font-size:14px;-webkit-appearance:none;appearance:none}
.mic{position:relative;width:48px;min-width:48px;height:46px;padding:0;background:var(--navy);color:#fff;border-radius:50%;overflow:visible}
.mic .ic-mic{width:22px;height:22px}
.mic .ring{position:absolute;inset:-4px;border-radius:50%;border:3px solid var(--gold);opacity:0;pointer-events:none}
.mic.on{background:var(--bad);animation:none}
.mic.on .ring{animation:micring 1.2s ease-out infinite}
@keyframes micring{0%{transform:scale(.85);opacity:.9}100%{transform:scale(1.35);opacity:0}}
.ask{align-items:center}
@media (max-width:760px){:root{--tabh:calc(62px + env(safe-area-inset-bottom))}}
.ask input{min-width:0;flex:1 1 auto;width:auto}.ask .btn{flex:none}.exam>div{min-width:0}
body.inexam footer.f{padding-bottom:calc(var(--tabh) + 70px)}
/* Phase 2: access model */
.accw{margin-left:auto}.accw+nav.main{margin-left:8px}
.accchip{display:inline-flex;align-items:center;gap:6px;background:rgba(251,192,5,.16);color:#FBC005;border:1px solid rgba(251,192,5,.55);border-radius:999px;padding:5px 10px;font-size:12.5px;font-weight:700;text-decoration:none;white-space:nowrap}
.accchip svg{width:15px;height:15px}.accchip.off{color:#ffb4b4;border-color:rgba(255,120,120,.6);background:rgba(198,40,40,.18)}
.vform{margin-top:16px;max-width:460px}.vform label{display:block;color:#fff;font-weight:700;font-size:14px;margin-bottom:6px}
.vform input{flex:1;min-width:160px;background:var(--card);color:var(--ink);border:2px solid var(--gold);border-radius:12px;padding:11px 12px;letter-spacing:.06em;text-transform:uppercase}
.vform .err{margin-top:8px}
.btn.onnavy{background:transparent;color:#fff;box-shadow:inset 0 0 0 2px #fff}.btn.onnavy:hover{background:rgba(255,255,255,.12)}
.orline{display:flex;align-items:center;gap:10px;color:var(--mut);font-size:13px;margin:16px 0}.orline:before,.orline:after{content:"";flex:1;height:1px;background:var(--line)}
pre.rpt{white-space:pre-wrap;font:inherit;font-size:13px;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px;max-height:40vh;overflow:auto}
.sq .opt[aria-disabled=true]{cursor:default}.sq .sx{margin-top:10px}
@media (max-width:560px){.accchip span{max-width:90px;overflow:hidden;text-overflow:ellipsis}.top .in{gap:8px}}
.tbl td.row{display:table-cell;white-space:normal}.tbl td.row>*{margin:2px 4px 2px 0}
/* ===== W49 Phase 4: futuristic layer, consistent with the Classes site (W46): glass, 3D, motion, themes ===== */
:root{--navy:#023173;--navy2:#0b3f8c;--deep:#01143a;--gold:#FBC005;--gold2:#E0A800;--ink:#0A1A3A;--mut:#46536d;--hd:#023173;--bg:#fff;--card:#fff;--field:#fff;--fline:rgba(2,49,115,.22);--soft:#eef2fa;--soft2:#eef3ff;--mist:#F4F7FC;--goldsoft:#fff4cc;--wasoft:#e8f8ee;--line:rgba(2,49,115,.12);--glass:rgba(255,255,255,.74);--glass2:rgba(255,255,255,.46);--gline:rgba(255,255,255,.8);--hdr:rgba(255,255,255,.84);--ease:cubic-bezier(.2,.8,.2,1);--r:18px;--sh:0 18px 50px -24px rgba(2,49,115,.45)}
html{color-scheme:light}
html[data-theme=dark]{color-scheme:dark;--hd:#e3ecff;--bg:#040b1f;--card:#0b1834;--field:#0d1d40;--fline:rgba(150,185,255,.3);--soft:#10224a;--soft2:#14295a;--mist:#071230;--goldsoft:rgba(251,192,5,.16);--wasoft:rgba(31,175,85,.18);--ink:#e6edfb;--mut:#a9b7d6;--line:rgba(150,185,255,.16);--glass:rgba(14,32,72,.62);--glass2:rgba(10,24,56,.4);--gline:rgba(150,185,255,.22);--hdr:rgba(4,11,31,.8);--ok:#4ade80;--okb:rgba(19,128,75,.24);--bad:#ff8a8a;--badb:rgba(198,40,40,.24);--sh:0 22px 54px -26px rgba(0,0,0,.85)}
body{background:var(--bg);color:var(--ink);transition:background-color .4s var(--ease),color .4s var(--ease)}
body::before{content:"";position:fixed;inset:-20vh -20vw;z-index:-1;pointer-events:none;background:radial-gradient(40vw 40vw at 12% 18%,rgba(11,74,168,.10),transparent 70%),radial-gradient(36vw 36vw at 88% 62%,rgba(251,192,5,.10),transparent 70%),radial-gradient(30vw 30vw at 40% 100%,rgba(2,49,115,.08),transparent 70%)}
html[data-theme=dark] body::before{background:radial-gradient(44vw 44vw at 12% 18%,rgba(40,100,220,.22),transparent 70%),radial-gradient(36vw 36vw at 88% 62%,rgba(251,192,5,.10),transparent 70%),radial-gradient(34vw 34vw at 40% 100%,rgba(30,80,190,.18),transparent 70%)}
:where(html[data-theme=dark]) a{color:#9cc2ff}
h1,h2,h3{color:var(--hd);letter-spacing:-.02em}h1{font-size:clamp(28px,5.6vw,48px)}
/* header: light glass with the navy lockup (white on dark), like the Classes site */
header.top{background:var(--hdr);border-bottom:1px solid var(--line);-webkit-backdrop-filter:saturate(1.6) blur(14px);backdrop-filter:saturate(1.6) blur(14px)}
header.top::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:linear-gradient(90deg,transparent,var(--gold) 20%,var(--gold) 80%,transparent);opacity:.85}
.brand{color:var(--hd)}.brand .wm-d{display:none}html[data-theme=dark] .brand .wm-l{display:none}html[data-theme=dark] .brand .wm-d{display:block}
.brand .wsub text{fill:#C99700}html[data-theme=dark] .brand .wsub text{fill:#FBC005}
.brand .tag{background:var(--navy);color:var(--gold)}html[data-theme=dark] .brand .tag{background:var(--gold);color:#023173}
nav.main a{color:var(--ink);border-radius:999px;transition:background .2s,color .2s,transform .2s var(--ease)}
nav.main a:hover{background:var(--soft)}nav.main a[aria-current=page],nav.main a[aria-current=page]:hover{background:var(--navy);color:#fff}
html[data-theme=dark] nav.main a[aria-current=page]{background:var(--gold);color:#023173}
.accchip{background:var(--goldsoft);color:#7a5b00;border-color:rgba(224,168,0,.55)}html[data-theme=dark] .accchip{color:var(--gold)}
.accchip.off{color:var(--bad);background:var(--badb);border-color:rgba(198,40,40,.4)}
.tgl{width:40px;height:40px;border-radius:50%;border:1.5px solid var(--line);background:var(--glass);color:var(--hd);display:grid;place-items:center;cursor:pointer;flex-shrink:0;transition:transform .5s var(--ease);padding:0;margin-left:6px}
.tgl:active{transform:scale(.9) rotate(-30deg)}.tgl svg{width:20px;height:20px}.tgl .mo{display:none}html[data-theme=dark] .tgl .su{display:none}html[data-theme=dark] .tgl .mo{display:block}
/* page transitions: fade + lift, but opacity only on the exam screen so the fixed question sheet never gets trapped */
.view{animation:vin .5s var(--ease) backwards}@keyframes vin{from{opacity:0;transform:translate3d(0,14px,0)}to{opacity:1;transform:none}}
body.inexam .view{animation:fadeonly .35s ease backwards}@keyframes fadeonly{from{opacity:0}to{opacity:1}}
/* glass cards + 3D tilt + reveal */
.card{background:linear-gradient(150deg,var(--glass),var(--glass2));border:1px solid var(--gline);border-radius:var(--r);box-shadow:0 1px 0 rgba(255,255,255,.4) inset,var(--sh)}
html[data-theme=dark] .card{box-shadow:0 1px 0 rgba(255,255,255,.06) inset,var(--sh)}
@supports ((-webkit-backdrop-filter:blur(1px)) or (backdrop-filter:blur(1px))){html:not(.lite) .card:not(.pal){-webkit-backdrop-filter:blur(12px) saturate(1.3);backdrop-filter:blur(12px) saturate(1.3)}}
.card.qcard,.modal .card,.card.solid{background:var(--card)}
.tilt{transform:perspective(900px) rotateX(var(--rx,0deg)) rotateY(var(--ry,0deg)) translateZ(0);transition:transform .45s var(--ease),box-shadow .3s var(--ease);transform-style:preserve-3d;position:relative}
.tilt.on{transition:transform .08s linear}
.tilt::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;opacity:0;transition:opacity .3s;background:radial-gradient(260px circle at var(--mx,50%) var(--my,50%),rgba(255,255,255,.35),transparent 60%)}
html[data-theme=dark] .tilt::after{background:radial-gradient(260px circle at var(--mx,50%) var(--my,50%),rgba(150,190,255,.16),transparent 60%)}
.tilt.on::after{opacity:1}.tilt .z{transform:translateZ(26px)}
.rv0{opacity:0;transform:translate3d(0,22px,0);transition:opacity .7s var(--ease),transform .7s var(--ease)}.rv0.in{opacity:1;transform:none}
.rv0.tilt.in{transform:perspective(900px) rotateX(var(--rx,0deg)) rotateY(var(--ry,0deg))}
/* buttons: gradient, shine, press */
.btn{border-radius:999px;position:relative;overflow:hidden;isolation:isolate;transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .2s}
.btn::after{content:"";position:absolute;top:0;bottom:0;left:-60%;width:40%;z-index:-1;background:linear-gradient(100deg,transparent,rgba(255,255,255,.45),transparent);transform:skewX(-18deg);opacity:0;transition:transform .7s var(--ease),opacity .3s}
.btn:hover::after{opacity:1;transform:translateX(420%) skewX(-18deg)}.btn:hover{transform:translateY(-2px)}.btn:active{transform:scale(.95)}
.btn.gold{background:linear-gradient(135deg,#FFD23F,#FBC005 45%,#E0A800);color:#023173;box-shadow:0 10px 24px -10px rgba(224,168,0,.9)}
.btn.ghost{background:var(--card);color:var(--hd);box-shadow:inset 0 0 0 1.5px rgba(2,49,115,.35)}html[data-theme=dark] .btn.ghost{box-shadow:inset 0 0 0 1.5px rgba(150,185,255,.4)}
html[data-theme=dark] .btn:not(.gold):not(.ghost):not(.link):not(.onnavy){background:linear-gradient(135deg,#1a4fb0,#0b3f8c)}
.btn.sm{border-radius:999px}.btn.link{color:var(--hd)}.btn.link::after{display:none}
.btn.gold.pulse{animation:glow 2.6s ease-in-out infinite}@keyframes glow{0%,100%{box-shadow:0 10px 24px -10px rgba(224,168,0,.9)}50%{box-shadow:0 10px 34px -6px rgba(251,192,5,.95)}}
/* hero: deep navy, formula canvas, a 3D CBT screen and book stack */
.hero{border-radius:26px;background:radial-gradient(90% 70% at 85% 0%,#0b3d8f 0%,var(--navy) 45%,var(--deep) 100%);padding:30px 20px 34px;isolation:isolate;box-shadow:0 30px 70px -40px rgba(1,20,58,.9)}
.hero .hin{position:relative;z-index:2;display:grid;gap:22px}
@media(min-width:900px){.hero{padding:52px 44px}.hero .hin{grid-template-columns:1.05fr .95fr;align-items:center}}
.hero .htx>*{opacity:0;transform:translate3d(0,18px,0);animation:rise .8s var(--ease) forwards}
.hero .htx>*:nth-child(2){animation-delay:.08s}.hero .htx>*:nth-child(3){animation-delay:.16s}.hero .htx>*:nth-child(4){animation-delay:.24s}.hero .htx>*:nth-child(5){animation-delay:.32s}
@keyframes rise{to{opacity:1;transform:none}}
.hero h1{color:#fff;text-shadow:0 2px 18px rgba(1,12,38,.55)}.hero h1 .gold{background:linear-gradient(90deg,#FBC005,#FFE07A 50%,#FBC005);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{color:rgba(255,255,255,.84)}.hero .gl,.hero .gl2{z-index:0}
.fx4{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;opacity:0;transition:opacity .7s ease;contain:strict;z-index:1}.fx4.on{opacity:1}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:12px;font-weight:800;letter-spacing:.2em;text-transform:uppercase;color:var(--gold2);margin-bottom:10px}.eyebrow::before{content:"";width:24px;height:2px;background:currentColor;border-radius:2px}.hero .eyebrow{color:var(--gold)}
.h3d{position:relative;perspective:1100px;min-height:300px;display:grid;place-items:center}
.dev{position:relative;width:min(330px,82vw);transform-style:preserve-3d;transform:rotateX(calc(14deg + var(--py,0deg))) rotateY(calc(-22deg + var(--px,0deg))) rotateZ(2deg);animation:hover3d 7s ease-in-out infinite;transition:transform .5s var(--ease)}
@keyframes hover3d{0%,100%{translate:0 0}50%{translate:0 -10px}}
.dev .scr{border-radius:22px;padding:16px;background:linear-gradient(160deg,rgba(255,255,255,.18),rgba(255,255,255,.05));border:1px solid rgba(255,255,255,.28);box-shadow:0 40px 60px -30px rgba(0,0,0,.7),inset 0 1px 0 rgba(255,255,255,.35);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);color:#fff}
.dev .top3{display:flex;align-items:center;gap:10px;margin-bottom:12px;transform:translateZ(30px)}
.dev .mring{width:46px;height:46px}.dev .mring circle{fill:none;stroke-width:5}.dev .mring .b{stroke:rgba(255,255,255,.18)}.dev .mring .f{stroke:var(--gold);stroke-linecap:round;stroke-dasharray:126;stroke-dashoffset:30;transform:rotate(-90deg);transform-origin:50% 50%;animation:ringrun 8s linear infinite}
@keyframes ringrun{from{stroke-dashoffset:0}to{stroke-dashoffset:126}}
.dev .tt{font-weight:800;font-size:13px;line-height:1.2}.dev .tt small{display:block;font-weight:600;color:rgba(255,255,255,.7);font-size:11px}
.dev .ql{height:8px;border-radius:5px;background:rgba(255,255,255,.28);margin:7px 0;transform:translateZ(18px)}.dev .ql.s{width:62%}
.dev .op{display:flex;align-items:center;gap:8px;margin-top:8px;padding:8px 10px;border-radius:12px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.16);font-size:12px;font-weight:700;transform:translateZ(22px)}
.dev .op i{width:20px;height:20px;border-radius:50%;display:grid;place-items:center;font-style:normal;font-size:11px;background:rgba(255,255,255,.2)}
.dev .op.pick{background:rgba(251,192,5,.22);border-color:rgba(251,192,5,.8);animation:pickglow 3.2s ease-in-out infinite}.dev .op.pick i{background:var(--gold);color:#023173}
@keyframes pickglow{0%,40%{box-shadow:0 0 0 0 rgba(251,192,5,0)}55%{box-shadow:0 0 0 6px rgba(251,192,5,.25)}100%{box-shadow:0 0 0 0 rgba(251,192,5,0)}}
.dev .bub{position:absolute;right:-18px;bottom:-26px;max-width:210px;padding:10px 12px;border-radius:16px 16px 4px 16px;background:#fff;color:#0A1A3A;font-size:12px;font-weight:600;box-shadow:0 20px 40px -18px rgba(0,0,0,.6);transform:translateZ(60px);display:flex;gap:8px;align-items:flex-start}
.dev .bub svg{width:28px;height:28px;flex:none}
.dev .bk3{position:absolute;width:74px;aspect-ratio:200/283;border-radius:6px;overflow:hidden;box-shadow:0 18px 30px -14px rgba(0,0,0,.7)}
.dev .bk3 img{width:100%;height:100%;object-fit:cover}.dev .bk3.a{left:-46px;top:-30px;transform:translateZ(70px) rotate(-10deg)}.dev .bk3.b{right:-40px;top:40px;transform:translateZ(-40px) rotate(8deg)}
@media(max-width:899px){.h3d{min-height:250px;margin-top:6px}.dev{width:min(290px,78vw)}.dev .bk3{width:58px}.dev .bk3.a{left:-24px}.dev .bk3.b{right:-18px}}
/* stats with counters */
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:-6px 0 18px;position:relative;z-index:3}
@media(min-width:800px){.stats{grid-template-columns:repeat(4,1fr)}}
.stats .st{border-radius:18px;padding:16px;background:linear-gradient(150deg,var(--glass),var(--glass2));border:1px solid var(--gline);box-shadow:var(--sh)}
.stats .st b{display:block;font-size:clamp(24px,5vw,34px);font-weight:800;color:var(--hd);line-height:1;letter-spacing:-.03em}.stats .st span{display:block;margin-top:6px;font-size:12.5px;font-weight:600;color:var(--mut)}
.stat{color:var(--hd)}
.xcard .ic,.fcard .ic{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,var(--navy),#0b4aa8);color:var(--gold);box-shadow:0 10px 22px -10px rgba(2,49,115,.8);margin-bottom:8px}
.xcard .ic svg,.fcard .ic svg{width:24px;height:24px}
/* books strip (current v4 covers only) */
.bks{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}@media(min-width:700px){.bks{grid-template-columns:repeat(6,1fr)}}
.bk{display:flex;flex-direction:column;gap:4px;text-decoration:none;color:var(--hd);min-width:0;perspective:600px}
.bk-c{display:block;border-radius:6px 10px 10px 6px;overflow:hidden;aspect-ratio:200/283;background:var(--mist);box-shadow:-4px 0 0 rgba(0,0,0,.18) inset,0 14px 26px -14px rgba(2,49,115,.6);transform:rotateY(-14deg);transform-origin:left center;transition:transform .45s var(--ease),box-shadow .35s}
.bk img{width:100%;height:100%;object-fit:cover;display:block}.bk:hover .bk-c,.bk:focus-visible .bk-c{transform:rotateY(0) translateY(-6px);box-shadow:0 22px 34px -16px rgba(2,49,115,.7)}
.bk b{font-size:12.5px;line-height:1.2}.bk small{font-size:10px;font-weight:700;color:var(--gold2)}
/* forms */
input[type=text],input[type=email],input[type=tel],input[type=password],input[type=number],select,textarea{background:var(--field);color:var(--ink);border-color:var(--fline)}
input,select,textarea{background-color:var(--field)}option,optgroup{background:var(--field);color:var(--ink)}
input::placeholder,textarea::placeholder{color:var(--mut);opacity:.8}
label{color:var(--hd)}.hint,.mut,.small.mut{color:var(--mut)}
.seg{background:var(--soft)}.seg button{color:var(--hd)}.seg button[aria-pressed=true]{background:var(--navy);color:#fff}
html[data-theme=dark] .seg button[aria-pressed=true],html[data-theme=dark] .chip[aria-pressed=true],html[data-theme=dark] .stabs button[aria-pressed=true],html[data-theme=dark] .adm-tabs a[aria-current=page]{background:var(--gold);color:#023173;border-color:var(--gold)}
.chip{color:var(--ink)}.chip:hover{transform:translateY(-1px)}
.pill{background:var(--soft);color:var(--hd)}.pill.gold{background:var(--goldsoft);color:#7a5b00}html[data-theme=dark] .pill.gold{color:var(--gold)}
.ref{background:var(--navy)}.ref.y{color:#023173}.ref.n{color:var(--hd)}.ref.t{color:var(--hd)}html[data-theme=dark] .ref{background:#1a3d82}html[data-theme=dark] .ref.y{background:var(--gold)}html[data-theme=dark] .ref.n,html[data-theme=dark] .ref.t{background:var(--soft)}
.btn.gold,.ref.y,.flagbtn[aria-pressed=true],.steps li::before,.vt button[aria-pressed=true],.skip{color:#023173}
/* exam: glass bar, ring timer, animated options */
.ebar{background:var(--hdr);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.tring{position:relative;display:inline-grid;place-items:center;width:62px;height:62px;flex:none}
.tring svg{position:absolute;inset:0;width:100%;height:100%;transform:rotate(-90deg)}.tring circle{fill:none;stroke-width:5}.tring .bg{stroke:var(--soft)}.tring .fg{stroke:var(--gold);stroke-linecap:round;transition:stroke-dashoffset 1s linear,stroke .3s}
.tring .timer{background:none;padding:0;min-width:0;font-size:13px;font-weight:800;color:var(--hd);animation:none}
.tring.low .fg{stroke:var(--bad)}.tring.low .timer{color:var(--bad)}.tring.low{animation:tick 1s ease-in-out infinite}@keyframes tick{50%{scale:1.06}}
.tring.long{width:74px;height:74px}.tring.long .timer{font-size:12px}
.opt{background:var(--card);border-color:var(--fline);transition:border-color .2s,background .2s,transform .25s var(--ease),box-shadow .25s var(--ease)}
.opt:hover{transform:translateY(-2px);box-shadow:0 12px 24px -16px rgba(2,49,115,.5)}
.opt[aria-pressed=true]{background:var(--soft2);border-color:var(--navy);animation:pick .35s var(--ease)}html[data-theme=dark] .opt[aria-pressed=true]{border-color:var(--gold)}
@keyframes pick{40%{transform:scale(1.02)}}
.opt.right{animation:okglow .9s var(--ease)}@keyframes okglow{0%{box-shadow:0 0 0 0 rgba(19,128,75,.5)}100%{box-shadow:0 0 0 12px rgba(19,128,75,0)}}
.opt.wrong{animation:shake .45s ease}@keyframes shake{20%,60%{transform:translateX(-5px)}40%,80%{transform:translateX(5px)}}
.opt .L{background:var(--soft);color:var(--hd)}html[data-theme=dark] .opt[aria-pressed=true] .L{background:var(--gold);color:#023173}
.palg button{background:var(--card);color:var(--ink);transition:transform .2s var(--ease)}.palg button:active{transform:scale(.9)}
html[data-theme=dark] .palg button.ans{background:#1a4fb0;border-color:#1a4fb0}
.pal{background:var(--card)}html[data-theme=dark] .pal{border-color:var(--line)}
.qimg{background:#fff}
.passage{background:var(--mist)}.qtext td,.qtext th{border-color:var(--fline)}
/* tutor: avatar, typing dots, message motion */
.tutor{background:var(--card);border-color:var(--line);box-shadow:var(--sh)}
.tutor .th{background:linear-gradient(110deg,var(--deep),var(--navy) 55%,#0a4aa6)}
.tav{width:34px;height:34px;border-radius:50%;flex:none;background:radial-gradient(circle at 30% 30%,#ffe07a,#FBC005 60%,#d9a400);display:grid;place-items:center;box-shadow:0 0 0 2px rgba(255,255,255,.35),0 6px 14px -6px rgba(0,0,0,.6);overflow:hidden}
.tav svg{width:30px;height:30px}
.chat{background:var(--mist)}
.msg{animation:msgin .35s var(--ease) both}@keyframes msgin{from{opacity:0;transform:translate3d(0,10px,0) scale(.98)}to{opacity:1;transform:none}}
.msg.t{background:var(--card);color:var(--ink)}.msg.u{background:linear-gradient(135deg,var(--navy),#0b4aa8)}
.msg .say{border:0;background:none;color:var(--mut);cursor:pointer;padding:2px 4px;margin-left:4px;vertical-align:middle;border-radius:6px}.msg .say:hover{color:var(--hd)}.msg .say svg{width:16px;height:16px;display:block}.msg .say.on{color:var(--gold2)}
.dots{display:inline-flex;gap:4px;padding:4px 2px}.dots i{width:7px;height:7px;border-radius:50%;background:var(--mut);animation:dot 1.2s infinite ease-in-out}.dots i:nth-child(2){animation-delay:.15s}.dots i:nth-child(3){animation-delay:.3s}
@keyframes dot{0%,80%,100%{transform:translateY(0);opacity:.4}40%{transform:translateY(-5px);opacity:1}}
.qchips button{background:var(--card);color:var(--hd);transition:transform .2s var(--ease),background .2s}.qchips button:hover{transform:translateY(-1px);background:var(--soft)}
.steps li{background:var(--mist)}.steps li.speak{background:var(--goldsoft)}.take{background:var(--goldsoft)}
.vpick{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap}.vpick .seg{display:inline-flex;padding:3px}.vpick .seg button{min-width:0;padding:6px 12px;font-size:13px}
/* results: rings, confetti-light */
.ring .bg{stroke:var(--soft)}.ring text{fill:var(--hd)}.ring text+text{fill:var(--mut)!important}
.conf{position:fixed;inset:0;pointer-events:none;z-index:85;overflow:hidden}.conf i{position:absolute;top:-12px;width:8px;height:14px;border-radius:2px;animation:fall var(--d,2.6s) cubic-bezier(.3,.6,.6,1) forwards;animation-delay:var(--dl,0s)}
@keyframes fall{to{transform:translate3d(var(--x,0),105vh,0) rotate(var(--r,540deg));opacity:.2}}
.score400{font-size:clamp(34px,7vw,52px);font-weight:800;color:var(--hd);line-height:1;letter-spacing:-.03em}.score400 small{font-size:.45em;color:var(--mut);font-weight:700}
/* tables, tabs, misc */
.tbl th{color:var(--mut)}.adm-tabs a{background:var(--soft);color:var(--hd);border-radius:999px}.adm-tabs a[aria-current=page]{background:var(--navy);color:#fff}
.stabs button{background:var(--soft);color:var(--hd);border-radius:999px}.stabs button[aria-pressed=true]{background:var(--navy);color:#fff}
.modal{background:rgba(1,12,38,.55);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}
.toast{background:var(--navy);box-shadow:var(--sh);border-radius:999px}html[data-theme=dark] .toast{background:#1a3d82}
.spin{border-color:var(--line);border-top-color:var(--gold2)}
footer.f{background:var(--deep);color:rgba(255,255,255,.75);border-top:0;margin-top:30px}footer.f a{color:#fff}
footer.f .fc a{background:rgba(255,255,255,.08);color:#fff}footer.f .fc a.fcall{background:var(--gold);color:#023173}footer.f .fc a.fcall svg{color:#023173}footer.f .fc a.fwa{background:#1FAF55;color:#fff}
html[data-theme=dark] footer.f{background:#020818}
@media (max-width:760px){.tabbar{background:var(--hdr);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-top:1px solid var(--line)}.tabbar a{transition:transform .25s var(--ease)}.tabbar a:active{transform:scale(.9)}.tabbar a[aria-current=page]{color:var(--hd);background:var(--soft)}}
.lesson{border-radius:22px}
@media (prefers-reduced-motion:reduce){.tilt,.dev{transform:none!important}.hero .htx>*{opacity:1;transform:none}.btn::after{display:none}.rv0{opacity:1;transform:none}}
html.lite .dev{animation:none}
/* ---------- W51 Phase 4 polish ---------- */
.brand .wm img.wm-d{display:none}html[data-theme=dark] .brand .wm img.wm-l{display:none}html[data-theme=dark] .brand .wm img.wm-d{display:block}
.pas{background:#01143a;color:rgba(255,255,255,.8);font-size:12px;font-weight:600;display:flex;justify-content:center;align-items:center;gap:14px;flex-wrap:wrap;padding:5px 12px;line-height:1.35;position:relative;z-index:31}
.pas a{color:#fff;text-decoration:none}.pas a b{color:var(--gold);font-weight:700}.pas a:hover{text-decoration:underline}.pas .pbk{color:#023173;background:var(--gold);border-radius:999px;padding:1px 10px;font-weight:700}.pas .pbk:hover{text-decoration:none;background:#ffcd2e}
@media (max-width:520px){.pas .ms{display:none}.pas{gap:10px;font-size:11.5px;flex-wrap:nowrap;white-space:nowrap}}
nav.main a.nbk{background:var(--gold);color:#023173;font-weight:700}nav.main a.nbk:hover{background:#ffcd2e}
@media (max-width:430px){.top .in:has(.accw:not([hidden])) .brand .tag{display:none}}
footer.f .fl{display:block;margin-top:6px}footer.f .fl a{font-weight:700}
html.thx,html.thx *,html.thx *::before,html.thx *::after{transition:background-color .4s ease,color .4s ease,border-color .4s ease,fill .4s ease!important}
.qnor{display:flex;align-items:center;gap:8px;justify-content:space-between}
.say{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:700;color:var(--hd);min-height:30px}.say svg{width:18px;height:18px;flex:none}.say.on{color:var(--gold2)}.say.on svg{animation:sayp 1s ease-in-out infinite}
@keyframes sayp{50%{transform:scale(1.18)}}
.sayq{background:var(--soft);border-radius:999px;padding:4px 10px}.sayx{background:var(--goldsoft);border-radius:999px;padding:5px 12px;margin:8px 0}
.msg .say{float:right;margin:2px -4px 0 6px}.msg .mt{display:inline}
.tintro{display:flex;gap:14px;align-items:center;margin-bottom:8px}.tintro h1{margin:0}
.tav.big{width:68px;height:68px;flex:none;display:inline-block;animation:bob 3.2s ease-in-out infinite;filter:drop-shadow(0 8px 18px rgba(2,49,115,.25))}.tav.big svg{width:100%;height:100%}
@keyframes bob{50%{transform:translateY(-5px) rotate(-2deg)}}
.vrow{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:10px 14px;margin:10px 0 12px}
.vrow .auto{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:600}.vrow .auto input{width:18px;height:18px;min-height:0;accent-color:var(--gold2)}
.prefs{display:flex;flex-direction:column;gap:10px}
@media (max-width:520px){.tintro .tav.big{width:52px;height:52px}}
@media (prefers-reduced-motion:reduce){.tav.big,.say.on svg{animation:none}}
/* ---------- W51: the main site's CBT demo on the CBT home (same look and behaviour as prestige-academic cbt.html) ---------- */
.quiz2{padding:22px;border-radius:24px;position:relative;overflow:hidden}
.quiz2 .qtop{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px}
.quiz2 .subj{display:inline-flex;align-items:center;gap:8px;font-weight:800;font-size:.86rem;background:rgba(251,192,5,.14);color:var(--gold);border:1px solid rgba(251,192,5,.35);padding:6px 12px;border-radius:999px}
.quiz2 .subj i{width:8px;height:8px;border-radius:50%;background:var(--gold);box-shadow:0 0 10px var(--gold)}
.quiz2 .meta{font-size:.76rem;color:rgba(255,255,255,.62);font-weight:600;margin:0 0 10px}
.quiz2 .timer{position:relative;width:46px;height:46px;flex:none}
.quiz2 .timer svg{width:46px;height:46px;transform:rotate(-90deg)}
.quiz2 .timer circle{fill:none;stroke-width:4}
.quiz2 .timer .bg{stroke:rgba(255,255,255,.12)}
.quiz2 .timer .fg{stroke:var(--gold);stroke-linecap:round;stroke-dasharray:125.7;stroke-dashoffset:0;transition:stroke-dashoffset 1s linear}
.quiz2 .timer b{position:absolute;inset:0;display:grid;place-items:center;font-size:.72rem}
.quiz2 .q{font-size:clamp(1.02rem,1.6vw,1.2rem);font-weight:700;line-height:1.45;margin:0 0 16px;min-height:3em}
.quiz2 .opts{display:grid;gap:10px}
.quiz2 .opt{display:flex;align-items:center;gap:12px;width:100%;text-align:left;font:inherit;font-weight:600;font-size:.95rem;color:#fff;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.16);border-radius:14px;padding:11px 14px;cursor:pointer;transition:background .25s,border-color .25s,transform .25s}
.quiz2 .opt i{flex:none;width:30px;height:30px;border-radius:9px;display:grid;place-items:center;font-style:normal;font-weight:800;background:rgba(255,255,255,.1)}
.quiz2 .opt:hover:not([disabled]){background:rgba(255,255,255,.12);transform:translateX(3px)}
.quiz2 .opt.right{background:rgba(34,197,94,.18);border-color:#22c55e}
.quiz2 .opt.right i{background:#22c55e;color:#04210f}
.quiz2 .opt.wrong{background:rgba(239,68,68,.16);border-color:#ef4444;animation:shake .4s}
.quiz2 .opt.wrong i{background:#ef4444}
.quiz2 .opt[disabled]{cursor:default}
@keyframes shake{25%{transform:translateX(-5px)}50%{transform:translateX(5px)}75%{transform:translateX(-3px)}}
.quiz2 .tutor{margin-top:16px;border-top:1px solid rgba(255,255,255,.12);padding-top:14px;display:none}
.quiz2.done .tutor{display:block}
.quiz2 .verdict{font-weight:800;margin:0 0 8px}
.quiz2 .verdict.ok{color:#4ade80}
.quiz2 .verdict.no{color:#fca5a5}
.quiz2 .st-h{display:flex;align-items:center;gap:8px;font-size:.78rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);margin:12px 0 6px}
.quiz2 .st-h svg{width:16px;height:16px}
.quiz2 ol{margin:0;padding-left:1.2em;display:grid;gap:6px;font-size:.92rem;color:rgba(255,255,255,.88)}
.quiz2 ol li{opacity:0;transform:translateY(8px);transition:opacity .45s,transform .45s}
.quiz2 ol li.in{opacity:1;transform:none}
.quiz2 .why,.quiz2 .take{font-size:.9rem;color:rgba(255,255,255,.85);background:rgba(255,255,255,.05);border-left:3px solid var(--gold);padding:9px 12px;border-radius:0 10px 10px 0;margin:10px 0 0}
.quiz2 .why{border-left-color:#ef4444}
.quiz2 .qfoot{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:16px;flex-wrap:wrap}
.quiz2 .score{font-size:.8rem;font-weight:700;color:rgba(255,255,255,.7)}
.quiz2 .next{--h:44px;font-size:.9rem}
.quiz2 .src{font-size:.72rem;color:rgba(255,255,255,.5);margin:10px 0 0}
.quiz2.swap .qbody{animation:qin .5s cubic-bezier(.2,.8,.2,1)}
@keyframes qin{from{opacity:0;transform:translateY(14px) scale(.98)}to{opacity:1;transform:none}}
.quiz2{color:#fff;background:linear-gradient(150deg,#03205a,#010C26)}
@media (prefers-reduced-motion:reduce){.quiz2 ol li{opacity:1;transform:none}.quiz2.swap .qbody{animation:none}}
[data-quiz2].mathwait .q,[data-quiz2].mathwait .opts{visibility:hidden}
[data-quiz2] .katex{font-size:1.06em}
[data-quiz2] .katex-display{margin:.5em 0;overflow-x:auto;overflow-y:hidden;padding:.15em 0}
[data-quiz2] .q .katex,[data-quiz2] .opt .katex{white-space:nowrap;font-size:1.18em}
a,button,.btn,.opt,.chip2{-webkit-tap-highlight-color:transparent;touch-action:manipulation}
.quiz2 .opt{transition:background-color .15s,border-color .15s,transform .12s}
.quiz2 .opt:active:not([disabled]){transform:scale(.985)}
.quiz2.swap .qbody{animation:qin .32s cubic-bezier(.2,.8,.2,1)}
.quiz2 .meta{display:flex;align-items:center;justify-content:space-between;gap:10px}
.quiz2 .qcount{flex:none;font-weight:800;font-size:.8rem;color:var(--navy);background:var(--gold);border-radius:999px;padding:3px 10px}
.quiz2 .qcount small{font-weight:700;opacity:.75}
.quiz2 .st-h{justify-content:space-between}
.quiz2 .st-h>span{display:inline-flex;align-items:center;gap:8px}
.quiz2 .listen{display:inline-flex;align-items:center;gap:6px;font:inherit;font-size:.78rem;font-weight:800;letter-spacing:.04em;text-transform:none;color:var(--navy);background:var(--gold);border:0;border-radius:999px;padding:7px 13px;cursor:pointer}
.quiz2 .listen svg{width:16px;height:16px}
.quiz2 .listen.on{background:#fff}
.quiz2 ol.steps li{opacity:0;transform:translateY(6px);transition:opacity .28s ease,transform .28s ease,background-color .2s}
.quiz2 ol.steps li.in{opacity:1;transform:none}
.quiz2 .talk{background:rgba(251,192,5,.16);border-radius:8px;box-shadow:0 0 0 4px rgba(251,192,5,.16)}
.quiz2 .chips2{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 0}
.quiz2 .chip2{font:inherit;font-size:.82rem;font-weight:700;color:#fff;background:rgba(255,255,255,.08);border:1px solid rgba(251,192,5,.55);border-radius:999px;padding:8px 13px;cursor:pointer;transition:background-color .15s,transform .12s}
.quiz2 .chip2:hover:not([disabled]){background:rgba(251,192,5,.18)}
.quiz2 .chip2:active:not([disabled]){transform:scale(.96)}
.quiz2 .chip2[disabled]{opacity:.45;cursor:default}
.quiz2 .chat{display:grid;gap:8px;margin-top:10px}
.quiz2 .chat .ask{justify-self:end;max-width:85%;margin:0;background:var(--gold);color:var(--navy);font-weight:700;font-size:.86rem;padding:8px 12px;border-radius:14px 14px 4px 14px}
.quiz2 .chat .reply{max-width:92%;font-size:.9rem;color:rgba(255,255,255,.92);background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);padding:10px 12px;border-radius:14px 14px 14px 4px}
.quiz2 .chat .reply small{display:block;margin-top:6px;font-size:.7rem;color:rgba(255,255,255,.5)}
.quiz2 .chat .ask,.quiz2 .chat .reply{opacity:0;transform:translateY(6px);transition:opacity .25s ease,transform .25s ease}
.quiz2 .chat .in{opacity:1;transform:none}
.quiz2.fin .tutor{display:block;border-top:0;padding-top:0;margin-top:4px}
.quiz2 .finbox{text-align:center;padding:6px 4px 2px}
.quiz2 .finbox h3{font-size:1.25rem;margin:10px 0 6px}
.quiz2 .finbox p{color:rgba(255,255,255,.85);font-size:.93rem;margin:0 auto;max-width:34em}
.quiz2 .finbox .btn-row{justify-content:center;margin-top:16px;display:flex;flex-wrap:wrap;gap:10px}
.quiz2 .ringscore{position:relative;width:96px;height:96px;margin:0 auto}
.quiz2 .ringscore svg{width:96px;height:96px;transform:rotate(-90deg)}
.quiz2 .ringscore circle{fill:none;stroke-width:4}
.quiz2 .ringscore .bg{stroke:rgba(255,255,255,.12)}
.quiz2 .ringscore .fg{stroke:var(--gold);stroke-linecap:round;stroke-dasharray:125.7;transition:stroke-dashoffset .8s ease}
.quiz2 .ringscore b{position:absolute;inset:0;display:grid;place-items:center;font-size:1.5rem}
.quiz2 .ringscore b small{font-size:.8rem;opacity:.7}
.quiz2 .dots{display:flex;justify-content:center;flex-wrap:wrap;gap:5px;margin:12px 0 0}
.quiz2 .dots i{width:10px;height:10px;border-radius:50%;background:#ef4444}
.quiz2 .dots i.y{background:#22c55e}
.rm .quiz2 ol.steps li,.rm .quiz2 .chat .ask,.rm .quiz2 .chat .reply{opacity:1;transform:none;transition:none}
.quiz2.fin .timer{visibility:hidden}
.quiz2 .ringscore b{display:flex;align-items:baseline;justify-content:center;gap:2px}
.quiz2 .vctl{display:inline-flex;align-items:center;gap:8px;text-transform:none;letter-spacing:0}
.quiz2 .vsel{display:inline-flex;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:999px;padding:2px}
.quiz2 .vsel button{font:inherit;font-size:.72rem;font-weight:700;color:rgba(255,255,255,.75);background:transparent;border:0;border-radius:999px;padding:5px 10px;cursor:pointer}
.quiz2 .vsel button[aria-pressed="true"]{background:#fff;color:var(--navy)}
.quiz2 .vprog{height:3px;border-radius:3px;background:rgba(255,255,255,.1);overflow:hidden;margin:0 0 8px}
.quiz2 .vprog i{display:block;height:100%;background:var(--gold);transform:scaleX(0);transform-origin:0 50%;transition:transform .25s linear}
@media (max-width:420px){.quiz2 .st-h{flex-wrap:wrap;gap:8px}}
.refs{display:flex;flex-wrap:wrap;gap:6px;align-items:center;min-width:0}
.rb{display:inline-flex;align-items:center;min-height:24px;padding:4px 10px;border-radius:999px;font-size:.68rem;font-weight:800;letter-spacing:.03em;line-height:1.25;white-space:nowrap}
.rb.rx{background:#FBC005;color:#023173}
.rb.ry{background:rgba(251,192,5,.12);color:#FBC005;box-shadow:inset 0 0 0 1px rgba(251,192,5,.6)}
.rb.rn{background:#fff;color:#023173}
.rb.rt{display:inline-block;border-radius:12px;background:rgba(255,255,255,.07);color:#E3ECFF;box-shadow:inset 0 0 0 1px rgba(255,255,255,.22);white-space:normal;font-weight:700;max-width:100%}
.rb.rt i{font-style:normal;color:#FBC005;margin-right:4px;font-weight:800}
.swap .refs .rb{animation:rbIn .35s var(--ease) both}
.swap .refs .rb:nth-child(2){animation-delay:.04s}
.swap .refs .rb:nth-child(3){animation-delay:.08s}
.swap .refs .rb:nth-child(4){animation-delay:.12s}
@media (prefers-reduced-motion:reduce){.swap .refs .rb{animation:none}}
@keyframes shake{25%{transform:translateX(-5px)}50%{transform:translateX(5px)}75%{transform:translateX(-3px)}}
@keyframes qin{from{opacity:0;transform:translateY(14px) scale(.98)}to{opacity:1;transform:none}}
@keyframes rbIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.quiz2{color:#fff;background:linear-gradient(150deg,#03205a,#010C26);border:1px solid rgba(255,255,255,.14);box-shadow:0 24px 60px rgba(1,12,38,.45),inset 0 1px 0 rgba(255,255,255,.08)}
.quiz2 .btn-gold{background:var(--gold);color:#023173;border:0}.quiz2 .btn-gold:hover{background:#ffcd2e}
.quiz2 .btn-ghost2{background:transparent;color:#fff;box-shadow:inset 0 0 0 2px rgba(255,255,255,.4)}.quiz2 .btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.quiz2 a{color:var(--gold)}.quiz2 .btn{color:#023173}.quiz2 .btn-ghost2{color:#fff}
.quiz2 select{background:#0d1d40;color:#fff;border-color:rgba(255,255,255,.25)}
.demo2{position:relative;overflow:hidden;margin:26px calc(50% - 50vw) 0;padding:44px 16px;background:radial-gradient(120% 90% at 85% 0%,#0b3f8c 0%,#03205a 45%,#010C26 100%);color:#fff;isolation:isolate}
.demo2 canvas.fx4{position:absolute;inset:0;width:100%;height:100%;z-index:-1;opacity:.55;pointer-events:none}
.demo2 .d2in{max-width:1180px;margin:0 auto;display:grid;gap:26px;grid-template-columns:minmax(0,1fr)}
@media (min-width:900px){.demo2 .d2in{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);align-items:center}.demo2{padding:64px 24px}}
.demo2 h2{color:#fff;font-size:clamp(26px,4.4vw,40px);letter-spacing:-.02em}.demo2 h2 .gold{color:var(--gold)}.demo2 p{color:rgba(255,255,255,.82);margin:0 0 14px;max-width:560px}
.demo2 .eyebrow{color:var(--gold)}
.demo2 .d2pts{display:flex;flex-wrap:wrap;gap:8px}.demo2 .d2pts span{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:700;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);border-radius:999px;padding:6px 12px}.demo2 .d2pts svg{width:16px;height:16px;color:var(--gold)}
@media (prefers-reduced-motion:reduce){.quiz2 .opt.wrong{animation:none}.quiz2.swap .qbody{animation:none}}
/* ---------- W51 Phase 3: tutor chat chips, countdown ring, results reveal, /400, tutor review, Learn ---------- */
.msg.tchips{background:none;border:0;padding:0;max-width:100%;display:flex;flex-wrap:wrap;gap:6px;align-self:flex-start}
.msg.tchips button{font:inherit;font-size:13px;font-weight:700;color:var(--hd);background:var(--soft);border:1px solid var(--gold);border-radius:999px;padding:6px 12px;cursor:pointer;transition:transform .15s var(--ease),background .2s}
.msg.tchips button:hover{background:var(--goldsoft)}.msg.tchips button:active{transform:scale(.95)}.msg.tchips .optchip{min-width:44px;font-size:15px}
.msg.t.in{animation:msgin .35s var(--ease) backwards}@keyframes msgin{from{opacity:0;transform:translate3d(0,8px,0) scale(.98)}}
.msg .src a{color:var(--hd);font-weight:700}
.cdr{position:relative;display:inline-flex;align-items:center;gap:8px;margin-right:auto}
.cdr svg{width:40px;height:40px;transform:rotate(-90deg);flex:none}.cdr circle{fill:none;stroke-width:4}.cdr .b{stroke:var(--soft)}.cdr .f{stroke:var(--gold);stroke-linecap:round;transition:stroke-dashoffset 1s linear,stroke .3s}
.cdr .timer{margin:0;font-size:16px!important;font-weight:800;color:var(--hd)}
.cdr.low .f{stroke:var(--bad)}.cdr.low .timer{color:var(--bad)!important}.cdr.crit svg{animation:cdpulse 1s ease-in-out infinite}
@keyframes cdpulse{50%{transform:rotate(-90deg) scale(1.12)}}
.go321{position:fixed;inset:0;z-index:95;display:grid;place-items:center;background:rgba(1,12,38,.72);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);pointer-events:none}
.go321 b{font-size:clamp(80px,22vw,160px);font-weight:800;color:var(--gold);text-shadow:0 0 40px rgba(251,192,5,.6);animation:g321 .65s var(--ease) backwards}.go321 b.g{color:#fff}
@keyframes g321{from{opacity:0;transform:scale(1.8)}}
.rvl{animation:rvl .6s var(--ease) backwards}.rvl:nth-of-type(2){animation-delay:.12s}.rvl:nth-of-type(3){animation-delay:.24s}
@keyframes rvl{from{opacity:0;transform:translate3d(0,18px,0)}}
.u400{margin-top:14px;display:grid;gap:16px;background:linear-gradient(135deg,#03205a,#010C26);color:#fff;border:1px solid rgba(251,192,5,.35);position:relative;overflow:hidden}
.u400::after{content:"";position:absolute;inset:-40% -20% auto auto;width:60%;height:140%;background:radial-gradient(closest-side,rgba(251,192,5,.25),transparent);pointer-events:none}
.u400 .eyebrow{color:var(--gold)}.u400 .score400{color:#fff;font-size:clamp(48px,11vw,84px)}.u400 .score400 small{color:rgba(255,255,255,.7)}.u400 .mut{color:rgba(255,255,255,.7)!important}
@media (min-width:760px){.u400{grid-template-columns:auto 1fr;align-items:center}}
.mrs{display:flex;flex-wrap:wrap;gap:14px;justify-content:flex-start}
.mr{display:grid;justify-items:center;gap:2px;width:88px;text-align:center;position:relative}
.mring2{width:64px;height:64px;transform:rotate(-90deg)}.mring2 circle{fill:none;stroke-width:6}.mring2 .bg{stroke:rgba(127,140,170,.25)}.mring2 .fg{stroke:#22c55e;stroke-linecap:round;transition:stroke-dashoffset 1.4s var(--ease)}.mring2 .fg.mid{stroke:var(--gold)}.mring2 .fg.weak{stroke:#ef4444}
.mr b{position:absolute;top:20px;left:0;right:0;font-size:12px;font-weight:800}.mr b i{font-style:normal}.mr b small{display:block;font-size:10px;opacity:.75}.mr span{font-size:11.5px;font-weight:700;line-height:1.2}
.u400 .mr b,.u400 .mr span{color:#fff}
.swr{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap;padding:8px 0;border-bottom:1px solid var(--line);font-size:14px}.okc{color:var(--ok)}.badc{color:var(--bad)}
.tview .tvh{display:flex;gap:12px;align-items:center;margin-bottom:10px}.tview .tvh .tav{width:46px;height:46px;flex:none}.tview .tvh .tav svg{width:100%;height:100%}
.trv{border:1px solid var(--line);border-radius:14px;padding:10px 12px;margin-top:8px;background:var(--card)}.trv summary{cursor:pointer;font-weight:600;font-size:14px;list-style:none}.trv summary::-webkit-details-marker{display:none}.trv[open]{box-shadow:var(--sh)}.trv.bad{border-left:4px solid var(--bad)}.trv.ok{border-left:4px solid var(--ok)}
.howkey{background:var(--soft);border-radius:12px;padding:8px 12px;margin:8px 0}.howkey summary{font-weight:700;cursor:pointer}
/* Learn */
.lhead{display:flex;gap:14px;align-items:center;margin-bottom:10px}.lstage.mini{width:84px;height:100px;flex:none}
.tsel2{min-height:40px;padding:6px 10px;width:auto;max-width:260px}
.ltc{display:grid;gap:4px;text-align:left;cursor:pointer;font:inherit;color:var(--ink);position:relative;padding-left:58px;min-height:78px;transition:transform .25s var(--ease),box-shadow .25s}
.ltc .ln{position:absolute;left:14px;top:14px;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--gold),#ffdf6b);color:#023173;font-weight:800;display:grid;place-items:center;font-size:13px}
.ltc b{color:var(--hd);font-size:15px}.ltc:hover{box-shadow:0 10px 30px rgba(2,49,115,.18)}
.lesson2{margin-top:18px;padding:0;overflow:hidden}
.lbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:12px 16px;border-bottom:1px solid var(--line)}.lbar .sp{flex:1}
.lprog{height:5px;background:var(--soft)}.lprog i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--gold),#ffdf6b);transition:width .5s var(--ease)}
.lgrid{display:grid;grid-template-columns:minmax(0,1fr);gap:0}
@media (min-width:860px){.lgrid{grid-template-columns:260px minmax(0,1fr)}}
.lstage{position:relative;display:grid;place-items:center;padding:18px 10px 8px;background:radial-gradient(90% 80% at 50% 30%,rgba(251,192,5,.18),transparent 70%),linear-gradient(180deg,#03205a,#010C26);min-height:210px;overflow:hidden}
.lstage.mini{padding:0;min-height:0;border-radius:18px}
.lstage::before{content:"E = mc² ∑ π H₂O √x ∫ ΔH F = ma";position:absolute;inset:auto -20% 10% -20%;color:rgba(251,192,5,.14);font-weight:800;font-size:22px;white-space:nowrap;animation:fdrift 18s linear infinite}
.lstage.mini::before{display:none}
@keyframes fdrift{from{transform:translateX(-10%)}to{transform:translateX(10%)}}
.tchar{width:150px;height:178px;position:relative;z-index:1}.lstage.mini .tchar{width:84px;height:100px}
.tchar .head{transform-origin:80px 120px;animation:hbob 3.4s ease-in-out infinite}.tchar .body{animation:bbreath 3.4s ease-in-out infinite;transform-origin:80px 186px}
.tchar .eyes{transform-origin:80px 80px;animation:blink 4.2s infinite}.tchar .mouth{transform-origin:80px 102px}.tchar .shd{fill:rgba(0,0,0,.3)}
.tchar .arm{transform-origin:122px 150px}.tchar .cap{transform-origin:80px 40px;animation:hbob 3.4s ease-in-out infinite}
.lstage.talking .mouth{animation:talk .22s ease-in-out infinite alternate}
.lstage.wave .arm{animation:wave .9s var(--ease)}
.lstage.happy .tchar{animation:hop .5s var(--ease) 2}.lstage.think .head{animation:tilt 1.2s var(--ease)}
@keyframes hbob{50%{transform:translateY(-3px) rotate(-1.5deg)}}@keyframes bbreath{50%{transform:scaleY(1.015)}}
@keyframes blink{0%,46%,50%,100%{transform:scaleY(1)}48%{transform:scaleY(.1)}}
@keyframes talk{from{transform:scaleY(.6)}to{transform:scaleY(2.6)}}
@keyframes wave{30%{transform:rotate(-14deg)}60%{transform:rotate(8deg)}}
@keyframes hop{50%{transform:translateY(-12px)}}@keyframes tilt{40%{transform:rotate(-8deg)}}
.lstage .bubble{position:relative;z-index:2;margin-top:8px;background:#fff;color:#023173;font-weight:700;font-size:13px;border-radius:14px;padding:8px 12px;max-width:230px;text-align:center;box-shadow:0 8px 20px rgba(0,0,0,.25)}
.lstage .bubble:empty{display:none}.lstage .bubble.pop{animation:bpop .35s var(--ease) backwards}@keyframes bpop{from{opacity:0;transform:scale(.85) translateY(6px)}}
.lslide{padding:18px 18px 8px;min-height:240px}.lslide.in{animation:slin .45s var(--ease) backwards}@keyframes slin{from{opacity:0;transform:translate3d(24px,0,0)}}
.lslide .lead2{font-size:17px;line-height:1.6}.lslide .ptext{font-size:16px;line-height:1.65}.lslide h2,.lslide h3{margin-top:4px}
.lslide .katex{animation:kglow 2.4s ease-in-out 1}@keyframes kglow{30%{text-shadow:0 0 14px rgba(251,192,5,.8)}}
.lsteps li{animation:stepin .45s var(--ease) backwards}@keyframes stepin{from{opacity:0;transform:translate3d(-10px,0,0)}}
.lnav{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:12px 16px;border-top:1px solid var(--line)}.lnav .sp{flex:1}.lnav .btn.on{background:#fff;color:#023173}
.ldone{text-align:center;padding:20px 0}
@media (max-width:859px){.lstage{min-height:0;grid-template-columns:auto 1fr;gap:10px;justify-items:start;padding:12px 14px}.lstage .tchar{width:96px;height:114px}.lstage .bubble{margin:0;max-width:none;text-align:left}}
@media (prefers-reduced-motion:reduce){.tchar *,.tchar,.lstage::before,.lslide.in,.lsteps li,.rvl,.msg.t.in,.go321 b,.cdr.crit svg{animation:none!important}}
html.lite .tchar *,html.lite .lstage::before{animation:none!important}
/* W54 chips */@media(max-width:700px){.qchips{flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;padding-bottom:2px}.qchips::-webkit-scrollbar{display:none}.qchips button{flex:0 0 auto;white-space:nowrap;max-width:78vw;overflow:hidden;text-overflow:ellipsis}}
/* W56 Phase 0: resume banner, bold countdown ring, save status */
.resumeb{display:flex;align-items:center;gap:12px;padding:14px 16px;margin:0 0 14px;border:1.5px solid var(--gold);background:linear-gradient(135deg,rgba(251,192,5,.14),rgba(2,49,115,.08))}
.resumeb>div:nth-child(2){flex:1;min-width:0}.resumeb b{color:var(--hd)}.rbi{font-size:24px;line-height:1}
.svs{white-space:nowrap;font-size:11px!important;opacity:.8}@media (max-width:420px){.svs{display:none}}
.cdr svg{width:48px;height:48px;filter:drop-shadow(0 0 6px rgba(251,192,5,.45))}.cdr circle{stroke-width:6}.cdr .b{stroke:rgba(251,192,5,.22)}
.cdr .f{stroke-width:6.5}.cdr.low svg{filter:drop-shadow(0 0 6px rgba(220,60,60,.55))}.cdr .timer{font-size:17px!important;font-variant-numeric:tabular-nums}
[data-theme=light] .cdr .b{stroke:rgba(2,49,115,.16)}
/* W56 Phase 0: always-visible "not answered" panel under the question card */
.skp{margin-top:14px;padding:14px 14px 12px}
.skh{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:8px}.skh b{color:var(--hd);font-size:15px}.skh .sp{flex:1}
.skn{display:inline-grid;place-items:center;min-width:24px;height:22px;padding:0 6px;border-radius:11px;background:var(--gold);color:#023173;font-size:12px;font-weight:800;margin-left:4px}
#sbk{white-space:nowrap}
.skr{padding:8px 0;border-top:1px solid rgba(127,140,170,.18)}
.skl{display:flex;align-items:center;gap:7px;font-weight:700;font-size:13px;color:var(--hd);margin-bottom:6px}.skl i{width:10px;height:10px;border-radius:50%;background:var(--sc);box-shadow:0 0 8px var(--sc)}.skl span{font-weight:600;opacity:.7;font-size:12px}
.skg{display:flex;flex-wrap:wrap;gap:6px}
.skg button{min-width:38px;height:34px;padding:0 8px;border-radius:9px;border:1.5px solid var(--sc);background:transparent;color:var(--hd);font:700 13px/1 Montserrat,system-ui,sans-serif;cursor:pointer;transition:transform .15s,background .15s}
.skg button:hover{background:color-mix(in srgb,var(--sc) 18%,transparent)}.skg button:active{transform:scale(.94)}
.skg button.fl{box-shadow:inset 0 0 0 2px var(--gold);position:relative}.skg button.fl::after{content:"";position:absolute;top:-4px;right:-4px;width:9px;height:9px;border-radius:50%;background:var(--gold)}
.skg button.ans{opacity:.75;border-style:dashed}
.skg button.cur{background:var(--sc);color:#023173}
.skg .more{border-style:dotted;font-size:12px}.skd{font-size:12px;color:var(--ok);font-weight:700}
.skleg{display:flex;gap:14px;flex-wrap:wrap;margin-top:8px;font-size:11px;opacity:.8}.skleg span{display:inline-flex;align-items:center;gap:5px}.skleg i{width:12px;height:12px;border-radius:4px;border:1.5px solid var(--hd)}.skleg i.f{border-color:var(--gold);box-shadow:inset 0 0 0 2px var(--gold)}.skleg i.c{background:var(--gold);border-color:var(--gold)}
.stabs button .sdot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--sc);margin-right:6px;vertical-align:1px}
@media (max-width:400px){#sbk{width:100%;margin-top:4px}.skg button{min-width:36px;height:34px}}
.skw{max-height:min(42vh,300px);overflow-y:auto;overscroll-behavior:contain;padding-right:4px;scrollbar-width:thin}
.skp *{animation:none!important}
.resumebar{display:flex;align-items:center;gap:10px;margin:0 0 14px;padding:11px 14px;border-radius:14px;background:linear-gradient(90deg,#FBC005,#ffd84d);color:#023173!important;text-decoration:none;font-size:14px;box-shadow:0 6px 22px rgba(251,192,5,.3)}
.resumebar b{color:#023173}.resumebar span:nth-child(2){flex:1;min-width:0}.rbg{font-weight:800;white-space:nowrap}.rbd{width:10px;height:10px;border-radius:50%;background:#023173;box-shadow:0 0 0 0 rgba(2,49,115,.5);animation:rbp 1.6s infinite}
@keyframes rbp{70%{box-shadow:0 0 0 8px rgba(2,49,115,0)}}@media (prefers-reduced-motion:reduce){.rbd{animation:none}}
.skny{margin:8px 0 0}
/* W56 Phase A: one speaker control everywhere: Listen + Female/Male + progress; never a robot voice */
.vx{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap;vertical-align:middle}
.vx .vxp{display:inline-flex;align-items:center;gap:6px;border:1.5px solid var(--gold);background:rgba(251,192,5,.12);color:var(--hd);border-radius:999px;padding:6px 12px;font:700 13px/1 Montserrat,system-ui,sans-serif;cursor:pointer;transition:background .2s,box-shadow .2s}
.vx .vxp svg{width:16px;height:16px}.vx.on .vxp{background:var(--gold);color:#023173;box-shadow:0 0 0 4px rgba(251,192,5,.22)}.vx.paused .vxp{background:rgba(251,192,5,.3)}
.vx .vxv{display:inline-flex;border:1px solid rgba(127,140,170,.35);border-radius:999px;overflow:hidden}
.vx .vxv button{border:0;background:transparent;color:var(--hd);font:700 12px/1 Montserrat,system-ui,sans-serif;padding:6px 10px;cursor:pointer;opacity:.7}
.vx .vxv button[aria-pressed=true]{background:var(--navy,#023173);color:#fff;opacity:1}[data-theme=dark] .vx .vxv button[aria-pressed=true]{background:#FBC005;color:#023173}
.vx .vxbar{flex:1;min-width:50px;max-width:140px;height:4px;border-radius:2px;background:rgba(127,140,170,.25);overflow:hidden}.vx .vxbar i{display:block;height:100%;width:0;background:var(--gold);transition:width .3s}
.vx .vxs{flex-basis:100%;font-size:12px;opacity:.85}.vx .vxs:empty{display:none}
.vx.vxm{gap:6px}.vx.vxm .vxp{padding:5px 8px}.vx.vxm .vxv button{padding:5px 8px;font-size:11px}
.vx.vxm .vxs{flex-basis:auto}
.vx.noau .vxp{opacity:.6}
.qnor .vx{margin-left:auto}
@media (prefers-reduced-motion:reduce){.vx .vxp,.vx .vxbar i{transition:none}}
/* W57: a speaker appears only once its words are known to have recorded audio */
.vx[data-blocks]:not(.vxok),#vc[data-blocks]:not(.vxok){display:none!important}
.vx.vxok{animation:vxin .35s ease both}@keyframes vxin{from{opacity:0;transform:translateY(2px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.vx.vxok{animation:none}}
[hidden]{display:none!important}
/* W57 partner co-branding */
#cobh{display:inline-flex;align-items:center;min-width:0;margin-left:2px}
.cob{display:inline-flex;align-items:center;gap:6px;min-width:0;font:700 13px/1.15 Montserrat,system-ui,sans-serif;color:var(--hd)}
.cob .x{color:var(--gold);font-weight:800;font-size:16px}
.cob img{border-radius:8px;object-fit:contain;background:#fff;flex:none}
.cob .cn{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:150px}
.cob.big{font-size:17px}.cob.big .cn{max-width:none;white-space:normal}
@media (max-width:420px){#cobh .cob .cn{max-width:74px;font-size:11px}#cobh .cob img{width:22px;height:22px}.cobr .brand .wsub{display:none}}
.plogo{width:36px;height:36px;border-radius:8px;object-fit:contain;background:#fff;vertical-align:middle;margin-right:6px}
.pdisc{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.phead{margin:4px 0 6px}.pbrand{display:inline-flex;align-items:center;gap:10px;flex-wrap:wrap;font:800 22px/1.2 Montserrat,system-ui,sans-serif;color:var(--hd)}
.rcob{display:flex;align-items:center;gap:8px;margin:-4px 0 10px;font-weight:700}.rcob .cob .cn{max-width:none}
/* ---------- W57 Phase B: corrections, elimination, try this, report (animations only outside the exam) ---------- */
.corr{display:grid;gap:10px;padding:4px 0}
.cvh{font-weight:700;padding:10px 12px;border-radius:12px;border:1px solid var(--line);background:linear-gradient(90deg,rgba(251,192,5,.14),transparent)}
.cvh.ok{background:linear-gradient(90deg,rgba(52,211,153,.18),transparent);border-color:rgba(52,211,153,.4)}.cvh.bad{background:linear-gradient(90deg,rgba(239,68,68,.16),transparent);border-color:rgba(239,68,68,.35)}
.cwhy{padding:8px 12px;border-left:3px solid #ef4444;background:rgba(239,68,68,.07);border-radius:0 10px 10px 0}.cwhy.ok{border-color:#34d399;background:rgba(52,211,153,.08)}
.corr .concept,.corr .take,.corr .tip,.corr .ccheck{padding:9px 12px;border-radius:12px;border:1px solid var(--line)}
.corr .concept b,.corr .take b,.corr .tip b,.corr .ccheck b{display:block;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--gold);margin-bottom:2px}
.corr .tip{background:linear-gradient(135deg,rgba(2,49,115,.10),rgba(251,192,5,.10));border-color:rgba(251,192,5,.45)}
.ch{margin:4px 0 0;font-size:14px}
.csteps{margin:0;padding-left:0;list-style:none;counter-reset:cs;display:grid;gap:8px}
.csteps li{counter-increment:cs;position:relative;padding:10px 12px 10px 44px;border-radius:12px;background:rgba(127,140,170,.08);border:1px solid var(--line);overflow-x:auto}
.csteps li::before{content:counter(cs);position:absolute;left:10px;top:9px;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;font:800 12px/1 Montserrat,system-ui,sans-serif;background:var(--gold);color:#023173;box-shadow:0 0 0 4px rgba(251,192,5,.18)}
details[open] .csteps li,.tys:not([hidden]) .csteps li{animation:cstep .5s cubic-bezier(.2,.8,.2,1) both;animation-delay:calc(var(--d,0) * .22s)}
@keyframes cstep{from{opacity:0;transform:translateY(8px);filter:blur(3px)}to{opacity:1;transform:none;filter:none}}
.corr .katex{animation:kglow 1.6s ease-out both}@keyframes kglow{from{text-shadow:0 0 12px rgba(251,192,5,.9)}to{text-shadow:none}}
.elim{border:1px solid rgba(79,195,247,.35);border-radius:14px;padding:10px;background:radial-gradient(120% 120% at 0 0,rgba(79,195,247,.10),transparent 60%)}
.elh{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;margin-bottom:8px}.elh .btn{margin-left:auto}
.elo{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.elo li{display:flex;gap:10px;align-items:flex-start;padding:8px 10px;border-radius:10px;border:1px solid var(--line);position:relative;transition:opacity .5s,background .5s,border-color .5s}
.elo li .L{flex:none;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-weight:800;border:2px solid currentColor;font-size:12px}
.elo li .ob{min-width:0;flex:1}.elo li .ot{position:relative;display:inline}
.elo li .ew{max-height:0;overflow:hidden;opacity:0;font-size:13px;transition:max-height .5s,opacity .5s,margin .5s}
.elo li.show .ew{max-height:240px;opacity:1;margin-top:4px}
.elo li.x{opacity:.62;background:rgba(239,68,68,.06)}
.elo li.x .ot{background:linear-gradient(#ef4444,#ef4444) no-repeat 0 55%/0 2px;animation:strike .55s ease-out forwards}
@keyframes strike{to{background-size:100% 2px}}
.elo li.x .L{color:#ef4444}.elo li.x .L::after{content:"";display:inline-block;-webkit-mask:url("data:image/svg+xml,") center/contain no-repeat;mask:url("data:image/svg+xml,") center/contain no-repeat;background:currentColor;width:22px;height:22px;position:absolute;left:12px;top:6px;color:#ef4444;animation:pop .35s ease-out both}
.elo li.win{border-color:#34d399;background:rgba(52,211,153,.12);box-shadow:0 0 0 3px rgba(52,211,153,.18),0 0 24px rgba(52,211,153,.25);animation:winp .7s ease-out}
.elo li.win .L{color:#34d399;background:rgba(52,211,153,.15)}
@keyframes pop{from{transform:scale(.2);opacity:0}to{transform:none;opacity:1}}@keyframes winp{0%{transform:scale(.98)}50%{transform:scale(1.015)}100%{transform:none}}
.tryq{border:1px dashed rgba(251,192,5,.6);border-radius:14px;padding:10px 12px;display:grid;gap:8px;background:rgba(251,192,5,.05)}
.tyh{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.tyo{display:grid;gap:6px}.tyo button{display:flex;gap:10px;align-items:flex-start;text-align:left;padding:9px 10px;border-radius:10px;border:1px solid var(--line);background:transparent;color:inherit;font:inherit;cursor:pointer}
.tyo button .L{font-weight:800;color:var(--gold)}.tyo button.right{border-color:#34d399;background:rgba(52,211,153,.12)}.tyo button.wrong{border-color:#ef4444;background:rgba(239,68,68,.10)}
.tys{display:grid;gap:8px}.tyv{font-weight:600}
.trv.skp>summary .pill{background:rgba(251,192,5,.2)}
/* report */
.rpt{margin-top:16px;display:grid;gap:12px;border:1px solid rgba(251,192,5,.45);background:linear-gradient(160deg,rgba(2,49,115,.16),transparent 55%)}
.rph{display:flex;align-items:center;gap:10px}.rph .plogo{margin-left:auto}
.rpg{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.rpg>div{display:grid;gap:2px;padding:10px;border-radius:12px;border:1px solid var(--line);min-width:0}.rpg b{overflow-wrap:anywhere}.rpg .big{font-size:24px;color:var(--gold)}.rpg .big small{font-size:13px;opacity:.8}
@media (max-width:520px){.rpg{grid-template-columns:1fr 1fr}.rpg>div:last-child{grid-column:1/-1}}
.rps{display:grid;gap:6px}.rpb{display:grid;grid-template-columns:minmax(90px,1fr) 2fr auto;gap:8px;align-items:center;font-size:14px}
.rpb i{height:8px;border-radius:5px;background:rgba(127,140,170,.25);position:relative;overflow:hidden}.rpb i::after{content:"";position:absolute;inset:0;width:var(--p);background:linear-gradient(90deg,#FBC005,#ffdc5e);border-radius:5px;animation:rpfill 1.2s cubic-bezier(.2,.8,.2,1) both}
@keyframes rpfill{from{width:0}}
.rp2 ul{margin:4px 0 0;padding-left:18px}.rpt h4{margin:0}.rpa p{margin:0 0 6px}.rpl{margin:0;padding-left:20px;display:grid;gap:4px}
@media (prefers-reduced-motion:reduce){details[open] .csteps li,.tys .csteps li,.corr .katex,.elo li.x .ot,.elo li.win,.elo li.x .L::after,.rpb i::after{animation:none!important}.elo li.x .ot{background-size:100% 2px}}
.lite details[open] .csteps li,.lite .rpb i::after{animation:none!important}
/* W57 Learn: book lessons */
.blz{display:grid;gap:14px;margin-top:14px}
.blh{display:flex;gap:14px;align-items:center;position:sticky;top:calc(var(--hdr,56px) + 4px);z-index:5;backdrop-filter:blur(8px)}
.blh h2{margin:2px 0 6px;font-size:clamp(1.15rem,3.6vw,1.6rem);line-height:1.2}
.blht{flex:1;min-width:0}
.blpb{height:6px;border-radius:9px;background:color-mix(in srgb,var(--navy,#023173) 12%,transparent);overflow:hidden;margin-bottom:8px}
.blpb i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--gold,#FBC005),#ffd84d);transition:width .5s ease}
.blo .lead{font-size:1.05rem;line-height:1.6}
.blob{list-style:none;padding:0;margin:6px 0 0;display:grid;gap:6px}.blob li{padding-left:26px;position:relative}.blob li:before{content:"";display:inline-block;-webkit-mask:url("data:image/svg+xml,") center/contain no-repeat;mask:url("data:image/svg+xml,") center/contain no-repeat;background:currentColor;width:16px;height:16px;position:absolute;left:3px;top:.3em;color:var(--gold,#FBC005)}
.bls{scroll-margin-top:150px;transition:box-shadow .3s,outline-color .3s;outline:2px solid transparent}
.bls.speaking{outline-color:var(--gold,#FBC005);box-shadow:0 0 0 6px color-mix(in srgb,var(--gold,#FBC005) 18%,transparent)}
.blsh{display:flex;gap:10px;align-items:center;margin-bottom:6px}.blsh h3{margin:0;font-size:1.12rem}
.bln{flex:none;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-weight:800;background:var(--navy,#023173);color:#fff}
.bls p,.blo p{line-height:1.65;margin:.5em 0}
.bd,.bf,.bc,.bw{border-radius:14px;padding:12px 14px;margin:12px 0}
.bd{background:color-mix(in srgb,var(--gold,#FBC005) 12%,transparent);border-left:4px solid var(--gold,#FBC005)}
.bdk{display:inline-block;font-size:.72rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--navy2,#1D4E9E);margin-bottom:2px}
html.dark .bdk,[data-theme=dark] .bdk{color:#9db8ff}
.bdt{display:block;margin-bottom:2px}
.bf{background:color-mix(in srgb,var(--navy,#023173) 7%,transparent);border:1px solid color-mix(in srgb,var(--navy,#023173) 20%,transparent);text-align:center}
.bft{font-weight:700;font-size:.92rem;margin-bottom:4px}.bfm{overflow-x:auto;padding:4px 0}.bfw,.bfn{text-align:left;margin-top:6px;opacity:.9}
.bc{border:1px solid}.bc-warning{background:rgba(180,35,24,.07);border-color:rgba(180,35,24,.35)}.bc-exam{background:rgba(14,124,134,.08);border-color:rgba(14,124,134,.4)}.bc-note{background:rgba(29,78,158,.06);border-color:rgba(29,78,158,.3)}
.bc>b{display:block;margin-bottom:2px}
.bw{background:var(--card2,rgba(2,49,115,.04));border:1px dashed color-mix(in srgb,var(--navy,#023173) 35%,transparent)}
.bwp{font-weight:500}.bws{margin:8px 0 0;padding-left:22px;display:grid;gap:6px}.bws li{line-height:1.6}
.bwa{margin-top:8px;padding:8px 10px;border-radius:10px;background:rgba(26,127,55,.1);border:1px solid rgba(26,127,55,.35)}
.bwb{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.bin{animation:binn .45s ease both}@keyframes binn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.bfig{margin:14px 0;position:relative;text-align:center}
.bfs{background:#fff;border-radius:14px;padding:8px;border:1px solid rgba(2,49,115,.12);min-height:80px;display:grid;place-items:center}
.bfs svg{width:100%;height:auto;max-height:440px}
.bfig figcaption{font-size:.88rem;margin-top:6px;line-height:1.5;text-align:left;opacity:.92}
.bfr{position:absolute;top:8px;right:8px;width:34px;height:34px;border-radius:50%;border:1px solid rgba(2,49,115,.2);background:#fff;color:#023173;font-size:1rem;cursor:pointer}
.bfig.fanim svg g[id^="axes"]>g{animation:figin .55s ease both;animation-delay:var(--d,0ms)}
.bfig.fanim svg g[id^="axes"]>g[id^="line2d"] path,.bfig.fanim svg g[id^="axes"]>g[id^="patch"] path{stroke-dasharray:1;stroke-dashoffset:1;animation:figdraw .9s ease forwards;animation-delay:var(--d,0ms)}
@keyframes figin{from{opacity:0}to{opacity:1}}@keyframes figdraw{to{stroke-dashoffset:0}}
.btw{overflow-x:auto;margin:10px 0}.btab{border-collapse:collapse;width:100%;font-size:.92rem}.btab th,.btab td{border:1px solid color-mix(in srgb,var(--navy,#023173) 18%,transparent);padding:7px 9px;text-align:left;vertical-align:top}.btab th{background:color-mix(in srgb,var(--navy,#023173) 8%,transparent)}
.byt{border:2px solid color-mix(in srgb,var(--gold,#FBC005) 60%,transparent)}
.byti{display:flex;gap:8px;margin-top:8px}.byti .inp{flex:1;min-width:0}
[data-mic].on{background:var(--gold,#FBC005);color:#023173;animation:pulse 1s infinite}
.byta{margin-top:8px;padding:8px 10px;border-radius:10px;background:color-mix(in srgb,var(--navy,#023173) 7%,transparent)}
.bytr .ok,.blqr .ok{color:#1A7F37;font-weight:700}.bytr .bad,.blqr .bad{color:#B42318;font-weight:700}
html.dark .bytr .ok,html.dark .blqr .ok{color:#4ade80}html.dark .bytr .bad,html.dark .blqr .bad{color:#f87171}
.blk ul,.blx ul{padding-left:20px;display:grid;gap:6px;line-height:1.6}
.blqq{padding:12px 0;border-top:1px solid color-mix(in srgb,var(--navy,#023173) 12%,transparent)}.blqq:first-of-type{border-top:0}
.blqq .opt.right{border-color:#1A7F37;background:rgba(26,127,55,.12)}.blqq .opt.wrong{border-color:#B42318;background:rgba(180,35,24,.1)}
.blt{position:relative}.bltp{display:block;height:4px;border-radius:4px;background:rgba(2,49,115,.12);overflow:hidden;margin-top:6px}.bltp i{display:block;height:100%;background:var(--gold,#FBC005)}
.bltd{position:absolute;top:10px;right:12px;font-size:.75rem;font-weight:800;color:#1A7F37}
@media (prefers-reduced-motion:reduce){.bin,.bfig.fanim svg g,.bfig.fanim svg path{animation:none!important;stroke-dasharray:none!important}}
html.lite .bin,html.lite .bfig.fanim svg g,html.lite .bfig.fanim svg path{animation:none!important;stroke-dasharray:none!important}
@media (max-width:600px){.blh{top:calc(var(--hdr,52px) + 2px);padding:10px 12px;gap:10px}.blh .lstage.mini{width:44px;height:44px}.blh h2{font-size:1.08rem}}
.blz{grid-template-columns:minmax(0,1fr)}.blz>*{min-width:0;max-width:100%}
.blz .katex-display{overflow-x:auto;overflow-y:hidden;padding:2px 0;max-width:100%}
.blz .bfm,.blz .bp,.blz .bd,.blz .bc,.blz .bw,.blz .byt,.blz .blo{overflow-wrap:anywhere;min-width:0}
.blz .katex{overflow-wrap:normal}
.bfs{display:block;overflow:hidden}.bfs svg{display:block;margin:0 auto}
.blh .vx{flex-wrap:wrap;max-width:100%}
.blht .eyebrow{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#lls{min-width:0;max-width:100%}
@media (max-width:600px){.blz .katex-display{font-size:.9em}}
.exd{margin:10px 0}.exd summary{cursor:pointer;list-style:none;display:flex;flex-direction:column;gap:2px}.exd summary::-webkit-details-marker{display:none}.exd summary:after{content:"Show";font-size:.8rem;font-weight:700;color:var(--navy2,#1D4E9E)}.exd[open] summary:after{content:"Hide"}
.exl{margin:10px 0 0;padding-left:20px;display:grid;gap:10px}.exl li{line-height:1.5}.exw{display:block;color:#B42318;font-weight:600}.exf{display:block;color:#1A7F37}html.dark .exw{color:#f87171}html.dark .exf{color:#4ade80}
.rpex .exd{box-shadow:none;border:1px solid color-mix(in srgb,var(--gold,#FBC005) 55%,transparent)}
/* W57 icons (Lucide stroke set) */
.ic{width:1.15em;height:1.15em;display:inline-block;vertical-align:-.2em;flex:none;stroke-width:2}
h2 .ic,h3 .ic,h4 .ic{width:1.05em;height:1.05em;vertical-align:-.15em;margin-right:.15em}
.ic-gold{color:var(--gold,#FBC005)}html:not(.dark) .card h3 .ic-gold,html:not(.dark) .card h4 .ic-gold,html:not(.dark) summary .ic-gold{color:#C99700}
.ic-ok{color:#1A7F37}html.dark .ic-ok{color:#4ade80}.ic-x{color:inherit}
.exw .ic{color:#B42318}.exf .ic{color:#1A7F37}html.dark .exw .ic{color:#f87171}html.dark .exf .ic{color:#4ade80}
.rbi .ic{width:26px;height:26px;color:var(--gold,#FBC005)}
.bfr .ic{width:18px;height:18px;vertical-align:middle}
[data-mic] .ic{width:18px;height:18px;vertical-align:middle}
.ic.draw path,.ic.draw circle,.ic.draw line,.ic.draw polyline{stroke-dasharray:1;stroke-dashoffset:1;animation:icdraw .6s ease forwards}
.ic.draw path{animation-delay:.25s}
@keyframes icdraw{to{stroke-dashoffset:0}}
.ic.pop{animation:icpop .6s cubic-bezier(.3,1.6,.5,1) both;transform-origin:50% 60%}
@keyframes icpop{0%{transform:scale(.3) rotate(-20deg);opacity:0}60%{transform:scale(1.15) rotate(6deg);opacity:1}100%{transform:none}}
@media (prefers-reduced-motion:reduce){.ic.draw path,.ic.draw circle,.ic.draw line,.ic.draw polyline{animation:none;stroke-dasharray:none;stroke-dashoffset:0}.ic.pop{animation:none}}
html.lite .ic.draw path,html.lite .ic.draw circle,html.lite .ic.draw line,html.lite .ic.draw polyline{animation:none;stroke-dasharray:none;stroke-dashoffset:0}html.lite .ic.pop{animation:none}
.exam .ic,.exam .ic *{animation:none!important;stroke-dasharray:none!important}
.pas .ic{width:.9em;height:.9em;vertical-align:-.08em;margin-left:2px;opacity:.85}
.ic-no{color:#B42318}html.dark .ic-no{color:#f87171}.ic.mk{width:1em;height:1em;vertical-align:-.12em;stroke-width:2.5}
/* W59 tutor character: narration lip-sync dock, gestures, reactions; exam techniques */
.lstage.talking .mouth{animation:none}
.tchar .arm{transform-origin:126px 188px}
.lstage.point .arm,.tdock.point .arm{animation:tpoint 1.2s var(--ease)}
@keyframes tpoint{35%{transform:rotate(-16deg) translateY(-6px)}70%{transform:rotate(-10deg) translateY(-4px)}}
.lstage.nod .head,.tmini.happy .head,.tdock.happy .head{animation:tnod .9s var(--ease) 2}
@keyframes tnod{30%{transform:translateY(3px) rotate(2deg)}60%{transform:translateY(-1px)}}
.tmini.think .head{animation:tilt 1.2s var(--ease) 1}
.tdock{position:fixed;z-index:30;left:12px;right:12px;bottom:calc(var(--tabh,0px) + 10px);display:flex;align-items:center;gap:10px;max-width:520px;margin:0 auto;padding:8px 12px 8px 8px;border-radius:18px;background:linear-gradient(180deg,#03205a,#010C26);color:#fff;box-shadow:0 14px 34px -12px rgba(1,12,38,.75),0 0 0 1px rgba(251,192,5,.28);animation:tdin .35s var(--ease) backwards}
.tdock[hidden]{display:none}
@keyframes tdin{from{opacity:0;transform:translateY(16px)}}
.tdock .tdf{flex:none;width:58px;height:66px;border-radius:14px;background:radial-gradient(80% 80% at 50% 30%,rgba(251,192,5,.22),transparent 70%);display:grid;place-items:end center;overflow:hidden}
.tdock .tchar{width:58px;height:69px}
.tdock .tdt{min-width:0;flex:1;font-size:13px;line-height:1.35}.tdock .tdn{color:var(--gold)}.tdock .mut{color:rgba(255,255,255,.65)}
.tdock .tdc{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;margin-top:2px;color:#fff}
.tdock .tdc.in{animation:tcin .35s ease backwards}@keyframes tcin{from{opacity:0;transform:translateY(4px)}}
.tdock.talking .tdf{box-shadow:0 0 0 2px rgba(251,192,5,.55)}
@media (min-width:860px){.tdock{left:auto;right:20px;bottom:20px;width:400px}}
.tre{display:flex;align-items:center;gap:8px}
.tmini{flex:none;width:34px;height:40px;border-radius:10px;background:linear-gradient(180deg,#03205a,#010C26);display:grid;place-items:end center;overflow:hidden}
.tmini .tchar{width:34px;height:40px}
.tlink{display:flex;align-items:center;gap:12px;margin:10px 0;text-decoration:none;color:inherit}.tlink>span:nth-child(2){flex:1;display:flex;flex-direction:column}
.tlink .tli{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,var(--navy),#0b4aa8);color:var(--gold)}
.tq h3,.tqs h3{margin-top:0}.tql{margin:0;padding-left:18px;display:grid;gap:8px}.tql li{line-height:1.55}
.tq,.tqs{margin-bottom:12px}
@media (prefers-reduced-motion:reduce){.tdock,.tdock .tdc.in,.tmini *,.tdock *{animation:none!important}}
html.lite .tdock *,html.lite .tmini *{animation:none!important}
.elo li.x .L{font-size:0;position:relative}.elo li.x .L::after{left:50%;top:50%;width:15px;height:15px;margin:-7.5px 0 0 -7.5px}
.blz{padding-bottom:96px}
/* W60: justified reading text in the Smart Tutor, corrections and lessons (clean edges; last lines, lists, formulas and short labels stay left) */
.msg.t .mt{display:block}
.msg.t .mt p{margin:0 0 6px}
.msg.t .mt p,.corr p,.corr .cwhy,.corr .concept,.corr .take,.corr .tip,.corr .ccheck,.tutor .concept,.tutor .take,.tutor .whys,.bls p,.bld p,.blk p,.blx p,.blo p,.bwp p,.blh .lead,.rpt p,.rpex,.ldone p,.tintro+p{text-align:justify;text-justify:inter-word;-webkit-hyphens:auto;hyphens:auto;text-align-last:left;overflow-wrap:break-word;word-spacing:normal}
.msg.t li,.corr li,.bls li,.bld li,.blk li,.csteps li,.bws li,.exl li,.msg.t .src,.tfig figcaption,.katex-display,.btab td,.btab th,.msg.u{text-align:left;-webkit-hyphens:manual;hyphens:manual}
.katex-display{text-align:center!important}
.msg.t .mt p:has(> .katex-display:only-child){text-align:center}
.tutor .th .tnew{margin-left:8px;display:inline-flex;align-items:center;gap:5px;font:inherit;font-size:12.5px;font-weight:700;color:var(--hd);background:var(--soft);border:1px solid var(--line);border-radius:999px;padding:5px 11px;cursor:pointer;transition:background .2s,border-color .2s,transform .15s var(--ease)}
.tutor .th .tnew:hover{border-color:var(--gold);background:var(--goldsoft)}.tutor .th .tnew:active{transform:scale(.96)}
.tutor .th .tnew svg{width:15px;height:15px}
@media (max-width:420px){.tutor .th .tnew{padding:6px 10px;font-size:12px}}
.tfigs{display:grid;gap:10px;margin:8px 0 4px}
.tfig{margin:0;background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px 8px 6px;color:#0f1b33}
.tfig .bfs{min-height:90px;display:flex;align-items:center;justify-content:center}.tfig .bfs svg{width:100%;height:auto;max-height:300px}
.tfig figcaption{font-size:.84rem;color:#24324d;opacity:1}.tfig figcaption b{color:#023173}
.tfig .bfr{position:absolute;top:6px;right:6px}
.tlsn{margin:4px 0 2px;display:inline-flex;gap:6px;align-items:center}
/* W60: branded slips preview */
.slipv{margin:10px 0 12px;display:flex;justify-content:center;min-height:120px;align-items:center}
.slipv .slipimg{width:100%;max-width:520px;height:auto;border-radius:14px;box-shadow:0 10px 30px rgba(2,49,115,.25)}
.sliplist{display:flex;flex-wrap:wrap;gap:6px;max-height:30vh;overflow:auto;margin-bottom:8px}
.msg.t .mt p.sl{text-align:left;-webkit-hyphens:manual;hyphens:manual}