:root{
  --ink:#1c2a4a; --muted:#5a6b8c; --bg1:#eef7ff; --bg2:#f8f0ff; --card:#ffffff;
  --teal:#14b8a6; --blue:#3b82f6; --violet:#8b5cf6; --pink:#ec4899; --soft:#eef3ff; --edge:#dbe5fa;
  --good:#0f9d6b; --bad:#d6336c; --radius:18px;
  --grad:linear-gradient(120deg,#14b8a6,#3b82f6 40%,#8b5cf6 75%,#ec4899);
  --k1:#5b21b6; --k1b:#ede9fe; --k2:#0f766e; --k2b:#ccfbf1; --k3:#be185d; --k3b:#fce7f3; --k4:#7a5200; --k4b:#fdf1c4;
}
*{box-sizing:border-box}
html{color-scheme:light;scroll-behavior:smooth;background:#f3f2ff}
body{margin:0;color:var(--ink);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans","Noto Sans Arabic","Noto Nastaliq Urdu","Noto Sans Devanagari",Arial,sans-serif;
  background:linear-gradient(160deg,var(--bg1),var(--bg2)) fixed;min-height:100vh;padding-bottom:84px}
main{max-width:1240px;margin:0 auto;padding:0 16px 40px}
.ic{width:1.15em;height:1.15em;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}

/* top menu */
.top{position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:14px;padding:10px 16px;background:rgba(255,255,255,.88);backdrop-filter:blur(12px);box-shadow:0 4px 20px rgba(59,130,246,.10)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;font-size:19px;margin-inline-end:auto}
.logo{width:36px;height:36px}
.nav-top{display:flex;gap:6px;flex-wrap:nowrap;overflow-x:auto}
.nav-top a{display:inline-flex;align-items:center;gap:7px;text-decoration:none;color:#35457a;font-weight:600;padding:8px 14px;border-radius:999px;white-space:nowrap}
.nav-top a:hover{background:var(--soft)}
.nav-top a.on{background:var(--grad);color:#fff}
.net{font-size:14px;color:var(--muted)}
.net.off{color:#8a3b86;background:#f6e8ff;padding:4px 12px;border-radius:999px}
@media(max-width:640px){.nav-top a span{display:none}.nav-top a{padding:9px 12px}.brand span{display:none}}

h1{font-size:clamp(28px,5vw,46px);line-height:1.15;margin:8px 0 12px;font-weight:800}
h2{font-size:20px;margin:0 0 8px;display:flex;align-items:center;gap:8px}
h3{font-size:17px;margin:0}
.sub{margin:30px 0 12px;font-size:22px}
.hero{padding:34px 0 8px}
.eyebrow{display:inline-block;margin:0 0 8px;padding:5px 14px;border-radius:999px;background:#fff;color:#4c3fb0;font-weight:700;font-size:14px;box-shadow:0 2px 10px rgba(139,92,246,.15)}
.lead{font-size:18px;color:var(--muted);max-width:760px;margin:0 0 24px}
.twocol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;align-items:start}
@media(max-width:860px){.twocol{grid-template-columns:1fr}}
.card{background:var(--card);border-radius:var(--radius);padding:22px;box-shadow:0 10px 30px rgba(59,130,246,.10);margin-bottom:18px}
.form{display:grid;gap:8px}
label{font-weight:600}
label.small{font-size:13px;color:var(--muted);font-weight:700}
.sr{position:absolute;left:-9999px}
input,textarea,select{font:inherit;color:var(--ink);padding:12px 14px;border-radius:12px;border:1.5px solid #cfdcf5;background:#fbfdff;width:100%}
select{width:auto;padding:8px 10px;cursor:pointer}
input:focus,textarea:focus,select:focus,button:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid #8b5cf666;outline-offset:2px}
input[type=file]{padding:10px;background:#fff}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:inherit;font-weight:700;color:#fff;background:var(--grad);border:0;border-radius:999px;padding:12px 24px;cursor:pointer;margin-top:6px;justify-self:start;transition:transform .12s,filter .12s}
.btn:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn.ghost{background:#fff;color:#4c3fb0;box-shadow:inset 0 0 0 2px #cdbdf7}
.btn.sm{padding:8px 16px;font-size:14px;margin-top:0}
.btn.big{padding:15px 34px;font-size:18px}
.btn[disabled]{opacity:.55;cursor:default;transform:none}
.icon-btn{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:50%;border:0;background:var(--soft);color:#4c3fb0;cursor:pointer;flex:none}
.icon-btn:hover{background:#e0e8ff}
.help{color:var(--muted);font-size:14px;margin:2px 0}
.center{text-align:center;justify-content:center}
.error{color:var(--bad);font-weight:600}
.status{color:#4c3fb0;font-weight:600;min-height:1.4em}
.mono{font-family:ui-monospace,Consolas,monospace;background:var(--soft);padding:10px 12px;border-radius:12px;font-size:14px;overflow-wrap:anywhere}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.row.end{justify-content:flex-end}
.bar{height:10px;border-radius:999px;background:#e5ecff;overflow:hidden;margin:10px 0}
.bar i{display:block;height:100%;width:0;background:var(--grad);transition:width .3s}
#uploadForm .bar{margin:6px 0}

/* feature tiles (also used as the overview grid) */
.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px;margin-bottom:18px}
.tile{display:flex;flex-direction:column;align-items:flex-start;gap:6px;text-align:start;font:inherit;color:var(--ink);background:#fff;border:0;border-radius:var(--radius);padding:18px;box-shadow:0 8px 24px rgba(59,130,246,.10)}
button.tile{cursor:pointer;transition:transform .15s,box-shadow .15s}
button.tile:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(139,92,246,.20)}
.tile-ic{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;color:#fff;background:linear-gradient(135deg,#14b8a6,#3b82f6)}
.tile-ic .ic{width:24px;height:24px}
.tile b{font-size:17px}
.tile-d{color:var(--muted);font-size:14px;line-height:1.45;flex:1}
.tile-go{display:inline-flex;align-items:center;gap:6px;font-weight:700;color:#4c3fb0;font-size:14px;margin-top:4px}
.t-flashcards .tile-ic,.t-listen .tile-ic{background:linear-gradient(135deg,#3b82f6,#8b5cf6)}
.t-quiz .tile-ic{background:linear-gradient(135deg,#8b5cf6,#ec4899)}
.t-lesson .tile-ic{background:linear-gradient(135deg,#14b8a6,#8b5cf6)}
.t-podcast .tile-ic{background:linear-gradient(135deg,#ec4899,#8b5cf6)}
.t-transcript .tile-ic{background:linear-gradient(135deg,#3b82f6,#14b8a6)}
.t-word .tile-ic{background:linear-gradient(135deg,#3b82f6,#6366f1)}
.feat .tile{box-shadow:0 6px 18px rgba(59,130,246,.08)}

.tip{max-width:760px}
.tip .btn{margin-top:10px}
.library{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.lib{display:grid;gap:4px;background:#fff;border-radius:16px;padding:16px;text-decoration:none;color:var(--ink);box-shadow:0 6px 18px rgba(139,92,246,.10);transition:transform .15s}
.lib:hover{transform:translateY(-2px)}
.lib-ic{width:36px;height:36px;border-radius:12px;background:var(--grad);color:#fff;display:grid;place-items:center;margin-bottom:4px}
.lib b{display:block}
.lib-sub{font-size:14px;color:var(--muted)}
.library .empty{color:var(--muted)}

/* lesson header */
.lhero{display:flex;flex-wrap:wrap;gap:18px;justify-content:space-between;align-items:flex-end;margin:18px 0 20px;padding:24px;border-radius:24px;background:linear-gradient(120deg,rgba(20,184,166,.14),rgba(59,130,246,.14) 40%,rgba(139,92,246,.16) 75%,rgba(236,72,153,.14));box-shadow:0 10px 30px rgba(59,130,246,.10)}
.lhero-main{flex:1 1 420px;min-width:0}
.lhero h1{font-size:clamp(26px,4vw,40px);margin:10px 0 6px;overflow-wrap:anywhere}
.orig{margin:0 0 4px;color:var(--muted);font-size:15px}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{display:inline-flex;align-items:center;gap:6px;background:#fff;color:#35457a;font-weight:700;font-size:13px;padding:4px 12px;border-radius:999px;box-shadow:0 2px 8px rgba(59,130,246,.12);border:0;font-family:inherit}
.chip:empty{display:none}
.chip.solid{background:var(--grad);color:#fff}
.lesson-tools{display:grid;gap:6px;min-width:240px}
.lesson-tools .btn{margin-top:4px;justify-self:stretch}

.stage{display:grid;grid-template-columns:minmax(0,300px) minmax(0,1fr);gap:22px;align-items:start}
@media(max-width:960px){.stage{grid-template-columns:1fr}}
.side{position:sticky;top:76px;display:grid;gap:14px}
@media(max-width:960px){.side{position:static}}
.video{border-radius:var(--radius);overflow:hidden;aspect-ratio:16/9;background:var(--grad);display:grid;place-items:center;color:#fff;text-align:center;padding:0;box-shadow:0 10px 30px rgba(59,130,246,.18)}
.video.plain{padding:14px;align-content:center;gap:6px}
.video.plain .ic{width:34px;height:34px}
.video.plain p{margin:0;font-weight:700}
.video.plain .help{color:#fff;opacity:.9;font-weight:500}
.video iframe{width:100%;height:100%;border:0}
.menu{display:grid;gap:4px;background:#fff;border-radius:var(--radius);padding:8px;box-shadow:0 10px 30px rgba(59,130,246,.10)}
@media(max-width:960px){
  .menu{display:flex;overflow-x:auto;position:sticky;top:60px;z-index:20;padding:6px;border-radius:999px;gap:4px;scrollbar-width:none}
  .menu::-webkit-scrollbar{display:none}
}
.tab{display:flex;align-items:center;gap:10px;font:inherit;font-weight:600;border:0;border-radius:12px;padding:11px 14px;background:transparent;color:#35457a;cursor:pointer;text-align:start;white-space:nowrap}
.tab:hover{background:var(--soft)}
.tab[aria-selected="true"]{background:var(--grad);color:#fff}
@media(max-width:960px){.tab{border-radius:999px;padding:9px 14px}}

.panel{min-height:380px;padding:24px;scroll-margin-top:76px}
.panel.flat{padding:20px}
.phead{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:flex-start;margin-bottom:14px}
.phead h2{font-size:24px;margin:0}
.phead.small{margin:26px 0 10px}
.phead.small h2{font-size:20px}
.pactions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.loading{display:flex;align-items:center;gap:12px;color:var(--muted);padding:12px 0}
.spin{width:22px;height:22px;border-radius:50%;border:3px solid #dbe5fa;border-top-color:var(--violet);animation:sp .8s linear infinite;flex:none}
@keyframes sp{to{transform:rotate(360deg)}}
.failbox{padding:6px 0}

/* colored keywords */
.kw{font-weight:800;border-radius:6px;padding:0 3px;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.k1{color:var(--k1);background:var(--k1b)}
.k2{color:var(--k2);background:var(--k2b)}
.k3{color:var(--k3);background:var(--k3b)}
.k4{color:var(--k4);background:var(--k4b)}
.legend{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 16px}
.legend .kw{font-size:13px;padding:2px 10px;border-radius:999px;font-weight:700}

/* grid of section cards (notes, summary, lesson plan) */
.grid{display:grid;gap:16px;margin-top:6px}
.grid.cols{grid-template-columns:repeat(auto-fill,minmax(290px,1fr))}
.sumwrap .grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.scard{background:#fbfcff;border-radius:16px;padding:16px 18px;box-shadow:inset 0 0 0 1.5px var(--edge);transition:box-shadow .2s,background .2s}
.scard.wide{grid-column:1/-1}
.scard header{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.scard header h3{flex:1;font-size:17px;line-height:1.3}
.num{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--grad);color:#fff;font-weight:800;font-size:15px;flex:none}
.num.ico .ic{width:18px;height:18px}
.s1 .num{background:linear-gradient(135deg,#3b82f6,#8b5cf6)}
.s2 .num{background:linear-gradient(135deg,#8b5cf6,#ec4899)}
.s3 .num{background:linear-gradient(135deg,#14b8a6,#8b5cf6)}
.cbody p{margin:6px 0}
.cbody ul{margin:0;padding-inline-start:20px}
.cbody li{margin:6px 0;line-height:1.55}
.cbody li::marker{color:var(--violet)}
.lead-card{background:linear-gradient(120deg,#f1fbff,#f7f1ff);box-shadow:inset 0 0 0 1.5px #d6e4ff;margin-bottom:16px}
.lead-card .cbody{font-size:18px;line-height:1.7}
.reading{background:#f3ecff !important;box-shadow:0 0 0 3px #b9a2f7 !important}
.terms{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.term{background:#fbfcff;border-radius:14px;padding:12px 14px;box-shadow:inset 0 0 0 1.5px var(--edge)}
.term dt{font-weight:800;margin:0 0 4px}
.term dd{margin:0;color:#3a4a70;font-size:15px}
.timeline{list-style:none;margin:6px 0 0;padding:0;display:grid;gap:10px}
.timeline li{display:flex;align-items:center;gap:12px;background:#fff;border-radius:14px;padding:10px 12px;box-shadow:inset 0 0 0 1.5px var(--edge)}
.timeline .step{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--grad);color:#fff;font-weight:800;flex:none}
.timeline .stext{flex:1}
.pill{display:inline-flex;align-items:center;gap:6px;background:var(--k2b);color:var(--k2);font-weight:700;font-size:13px;padding:3px 12px;border-radius:999px;white-space:nowrap}

/* flashcards */
.fcwrap{max-width:640px;margin:0 auto}
.fcwrap .row{margin:10px 0}
.prog{margin-bottom:10px}
.flipcard{display:block;width:100%;perspective:1100px;background:none;border:0;padding:0;cursor:pointer;height:280px;font:inherit;color:#fff}
.flipcard .inner{display:block;position:relative;width:100%;height:100%;transition:transform .55s;transform-style:preserve-3d}
.flipcard.on .inner{transform:rotateY(180deg)}
.face{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:26px;border-radius:22px;backface-visibility:hidden;-webkit-backface-visibility:hidden;text-align:center;box-shadow:0 14px 34px rgba(59,130,246,.25)}
.face small{font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:12px;opacity:.85}
.face .ft{font-size:clamp(18px,2.6vw,24px);font-weight:700;line-height:1.4}
.face.front{background:linear-gradient(135deg,#14b8a6,#3b82f6 60%,#8b5cf6)}
.face.back{background:linear-gradient(135deg,#8b5cf6,#ec4899);transform:rotateY(180deg)}
.done{text-align:center;padding:30px 10px}
.done-ic{display:inline-grid;place-items:center;width:70px;height:70px;border-radius:50%;background:var(--grad);color:#fff;margin-bottom:10px}
.done-ic .ic{width:34px;height:34px}

/* quiz */
.quiz{max-width:760px;margin:0 auto}
.qtop{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.qcard{position:relative;display:flex;gap:12px;align-items:flex-start;justify-content:space-between;background:linear-gradient(120deg,#f1fbff,#f7f1ff);border-radius:18px;padding:20px;margin:6px 0 14px;box-shadow:inset 0 0 0 1.5px #d6e4ff}
.qtext{font-size:clamp(19px,2.6vw,24px);line-height:1.4;font-weight:800}
.opts{display:grid;gap:10px}
.opt{display:flex;align-items:center;gap:14px;width:100%;text-align:start;font:inherit;font-size:17px;border:2px solid var(--edge);background:#fff;border-radius:16px;padding:14px 16px;cursor:pointer;color:var(--ink);transition:border-color .15s,background .15s,transform .1s}
.opt:hover:not([disabled]){border-color:#b9a2f7;background:#faf7ff;transform:translateY(-1px)}
.letter{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--soft);color:#4c3fb0;font-weight:800;flex:none}
.otext{flex:1}
.opt[disabled]{cursor:default}
.opt.right{background:#e3f8ee;border-color:var(--good)}
.opt.right .letter{background:var(--good);color:#fff}
.opt.wrong{background:#fde7ef;border-color:var(--bad)}
.opt.wrong .letter{background:var(--bad);color:#fff}
.why{border-radius:14px;padding:12px 16px;margin:14px 0}
.why b{display:flex;align-items:center;gap:8px}
.why p{margin:4px 0 0}
.why.ok{background:#e3f8ee;color:#0b6b49}
.why.no{background:#fde7ef;color:#9b1c4b}
.result{text-align:center;padding:10px 0 6px}
.ring{--p:0;width:150px;height:150px;border-radius:50%;margin:6px auto 12px;display:grid;place-items:center;background:conic-gradient(#14b8a6 calc(var(--p)*1%),#e5ecff 0)}
.ring span{display:grid;place-items:center;width:114px;height:114px;border-radius:50%;background:#fff;font-size:30px;font-weight:800}
.review{display:grid;gap:8px}
.rv{display:flex;gap:12px;align-items:flex-start;border-radius:14px;padding:10px 14px}
.rv.ok{background:#effaf5}
.rv.no{background:#fff1f6}
.rv-ic{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;color:#fff;flex:none}
.rv.ok .rv-ic{background:var(--good)}
.rv.no .rv-ic{background:var(--bad)}
.rv p{margin:2px 0 0}

/* podcast */
.pod-hero{display:flex;gap:20px;align-items:center;flex-wrap:wrap;background:linear-gradient(120deg,#f1fbff,#f7f1ff);border-radius:20px;padding:20px;margin-bottom:18px;box-shadow:inset 0 0 0 1.5px #d6e4ff}
.pod-info{flex:1 1 300px;min-width:0}
.pod-info h2{margin-bottom:2px}
.hosts{display:flex}
.avatar{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;color:#fff;font-weight:800;flex:none;background:linear-gradient(135deg,#14b8a6,#3b82f6)}
.avatar.B{background:linear-gradient(135deg,#8b5cf6,#ec4899)}
.avatar.big{width:68px;height:68px;font-size:28px;box-shadow:0 0 0 4px #fff}
.hosts .avatar.B{margin-inline-start:-14px}
.pod-hero .row{margin:8px 0}
.pod-hero .btn{margin:0}
.chat{display:grid;gap:12px}
.turn{display:flex;gap:10px;align-items:flex-end;cursor:pointer;max-width:88%;border-radius:20px;padding:4px}
.turn.B{flex-direction:row-reverse;margin-inline-start:auto}
.bubble{background:#f1f6ff;border-radius:18px 18px 18px 6px;padding:10px 16px}
.turn.B .bubble{background:#f5efff;border-radius:18px 18px 6px 18px}
.bubble b{font-size:13px;color:#4c3fb0}
.bubble p{margin:2px 0 0}
.prate{padding:8px 10px}

/* transcript as a document */
.tbar{position:relative;margin-bottom:12px}
.tbar .sicon{position:absolute;inset-inline-start:14px;top:50%;transform:translateY(-50%);color:var(--muted);display:grid}
.tbar input{padding-inline-start:42px;border-radius:999px}
.seg{display:inline-flex;background:var(--soft);border-radius:999px;padding:4px}
.segb{font:inherit;font-weight:700;font-size:14px;border:0;background:transparent;color:#35457a;padding:7px 16px;border-radius:999px;cursor:pointer}
.segb[aria-selected="true"]{background:#fff;color:#4c3fb0;box-shadow:0 2px 8px rgba(59,130,246,.18)}
.kwchips{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 16px}
.kwchips .chip{cursor:pointer;box-shadow:none}
.paper{background:#fff;border-radius:6px;padding:34px clamp(18px,5vw,56px);box-shadow:0 8px 30px rgba(30,40,100,.14);max-width:860px;margin:0 auto;font-family:Georgia,"Noto Serif","Noto Naskh Arabic","Noto Nastaliq Urdu",serif;font-size:17px;line-height:1.85}
.paper h3{font-size:26px;line-height:1.3;margin:0 0 4px;font-family:system-ui,"Segoe UI",sans-serif;font-weight:800}
.paper h4{font-family:system-ui,"Segoe UI",sans-serif;color:#4c3fb0;font-size:18px;margin:26px 0 8px}
.paper>.help{font-family:system-ui,"Segoe UI",sans-serif;margin-bottom:18px}
.tl{display:grid;grid-template-columns:62px minmax(0,1fr);gap:12px;margin:2px 0;padding:3px 6px;border-radius:8px}
.tl time{color:#4c3fb0;font-weight:700;font-variant-numeric:tabular-nums;font-family:system-ui,sans-serif;font-size:14px;padding-top:4px;direction:ltr}
.doc .bar[hidden]{display:none}

/* read aloud bar */
.rbar{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:50;display:flex;align-items:center;gap:8px;max-width:calc(100% - 24px);width:760px;background:#1c2a4a;color:#fff;border-radius:999px;padding:8px 10px;box-shadow:0 14px 40px rgba(20,20,60,.4)}
.rbar[hidden]{display:none}
.rb{display:grid;place-items:center;width:38px;height:38px;border-radius:50%;border:0;background:rgba(255,255,255,.14);color:#fff;cursor:pointer;flex:none}
.rb:hover{background:rgba(255,255,255,.26)}
.rb.main{background:var(--grad);width:44px;height:44px}
.rtext{flex:1;min-width:0;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding:0 6px}
.rbar select{background:rgba(255,255,255,.14);color:#fff;border:0;padding:7px 8px;font-size:14px;max-width:150px}
.rbar select option{color:#1c2a4a}
@media(max-width:640px){.rtext{display:none}.rbar{justify-content:center}}

dialog{border:0;border-radius:22px;padding:24px;max-width:520px;width:calc(100% - 32px);box-shadow:0 30px 80px rgba(60,40,140,.35);color:var(--ink)}
dialog::backdrop{background:rgba(40,30,90,.45)}
.checks{display:grid;gap:6px;margin:12px 0}
.checks label{display:flex;gap:10px;align-items:center;font-weight:500}
.checks input{width:auto}
.paste textarea{min-height:160px}
.paste{display:grid;gap:10px}
[dir="rtl"]{text-align:right}
@media print{.top,.side,.rbar,.pactions{display:none}}
@media(prefers-reduced-motion:reduce){*{transition:none !important;animation:none !important;scroll-behavior:auto !important}}

.lchips{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0}
.lchip{font:inherit;font-size:13px;font-weight:600;border:0;border-radius:999px;padding:4px 11px;background:var(--soft);color:#35457a;cursor:pointer}
.lchip:hover{background:var(--grad);color:#fff}
.lesson-tools{min-width:260px;max-width:340px}
.askfab{position:fixed;right:16px;bottom:84px;z-index:45;display:inline-flex;align-items:center;gap:8px;border:0;border-radius:999px;padding:13px 20px;font:inherit;font-weight:800;color:#fff;background:var(--grad);box-shadow:0 12px 30px rgba(80,60,200,.4);cursor:pointer}
.askfab[hidden]{display:none}
.askbox{position:fixed;right:16px;bottom:140px;z-index:60;width:min(380px,calc(100% - 32px));max-height:70vh;display:flex;flex-direction:column;gap:8px;background:#fff;border-radius:20px;padding:14px;box-shadow:0 20px 60px rgba(40,30,120,.35)}
.askbox[hidden]{display:none}
.askbox header{display:flex;justify-content:space-between;align-items:center}
.asklog{overflow-y:auto;display:grid;gap:8px;max-height:36vh;min-height:60px}
.msg{padding:8px 12px;border-radius:14px;position:relative}
.msg p{margin:0}
.msg.q{background:var(--grad);color:#fff;justify-self:end;max-width:90%}
.msg.a{background:#f1f6ff;max-width:95%}
.msg.a .icon-btn{margin-top:4px;width:30px;height:30px}
.msg .btn{margin:6px 0 0}
.askform{display:flex;gap:8px;align-items:center}
.askform input{padding:10px 12px}
.askopt{display:flex;gap:8px;align-items:center}
.askopt input{width:auto}
.icon-btn.mic.on{background:var(--pink);color:#fff;animation:pulse 1s infinite}
@keyframes pulse{50%{box-shadow:0 0 0 8px rgba(236,72,153,.25)}}
.rbar{width:820px}