/* Bubbles. Three columns on a Chromebook (menu, orb + chat, study panel); stacks on small screens. */
:root{
  --bg:#F4EBFF; --bg2:#E7D7FB; --card:rgba(255,255,255,.82); --card-solid:#FFFFFF; --line:rgba(139,92,246,.26);
  --fg:#2E1065; --muted:#6B5B95; --accent:#7E22CE; --accent2:#C084FC;
  --pink:#F472B6; --blue:#60A5FA; --green:#4ADE80; --yellow:#FCD96B;
  --ok:#DCFCE7; --okfg:#14532D; --bad:#FFE4EC; --badfg:#9F1239;
  --shadow:0 12px 30px -8px rgba(91,33,182,.28),0 2px 6px rgba(91,33,182,.12);
  --display:'Titan One','Fredoka',system-ui,sans-serif; --body:'Fredoka',system-ui,-apple-system,'Segoe UI',sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#1B0F33; --bg2:#2A1650; --card:rgba(43,24,80,.8); --card-solid:#2B1850; --line:rgba(196,160,255,.28);
  --fg:#F3EBFF; --muted:#B7A5DB; --accent:#C084FC; --accent2:#A855F7;
  --ok:#12351f; --okfg:#BBF7D0; --bad:#4a1630; --badfg:#FBCFE8;
  --shadow:0 12px 30px -8px rgba(0,0,0,.6),0 2px 6px rgba(0,0,0,.3); color-scheme:dark}}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{height:100%}
body{margin:0;font-family:var(--body);color:var(--fg);background:radial-gradient(ellipse at 50% 30%,var(--bg) 0%,var(--bg2) 100%);overflow:hidden}
#bg{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none}
#app{position:relative;z-index:1;height:100%;display:grid;grid-template-columns:244px minmax(0,1fr) 352px;gap:0}
button{font-family:inherit;color:inherit}
button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
.card{background:var(--card);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}
.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;font-weight:600;color:var(--accent)}
.tag{font-size:11px;font-weight:600;border-radius:999px;padding:2px 9px;background:color-mix(in srgb,var(--accent2) 22%,transparent);color:var(--accent)}
.tag.ok{background:var(--ok);color:var(--okfg)}

/* menu */
#side{padding:22px 16px 18px;display:flex;flex-direction:column;gap:9px;overflow-y:auto;min-height:0}
.brand{display:flex;align-items:center;gap:10px;padding:0 6px 10px;font-family:var(--display);font-size:28px;letter-spacing:.03em}
.brand-dot{width:36px;height:36px;border-radius:50%;background:radial-gradient(circle at 32% 28%,#fff 0%,#D8B4FE 40%,#9333EA 100%);box-shadow:0 6px 14px -4px rgba(91,33,182,.5);flex:0 0 36px}
.nav{display:flex;align-items:center;gap:12px;border:1px solid var(--line);background:var(--card);border-radius:16px;padding:10px 14px;font-size:16px;font-weight:600;text-align:left;cursor:pointer;box-shadow:0 6px 14px -8px rgba(91,33,182,.4)}
.nav svg{width:21px;height:21px;fill:none;stroke:var(--accent);stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;flex:0 0 21px}
.nav.on{border-color:transparent;color:#2E1065;background:linear-gradient(180deg,#FFE4F2,#F6A5D0)}
.nav[data-view="quiz"].on{background:linear-gradient(180deg,#E3EEFF,#8EBDFB)}
.nav[data-view="cards"].on{background:linear-gradient(180deg,#E4FBEA,#7DE0A4)}
.nav[data-view="pdfs"].on,.nav[data-view="progress"].on,.nav[data-view="settings"].on{background:linear-gradient(180deg,#FFF1B8,#FCD96B)}
.nav.on svg{stroke:#2E1065}
.grow{flex:1}
.music{padding:13px;display:flex;flex-direction:column;gap:10px}
.music-head{display:flex;justify-content:space-between;align-items:center}
.music-now{display:flex;gap:10px;align-items:center}
.art{width:44px;height:44px;border-radius:13px;flex:0 0 44px;background:radial-gradient(circle at 30% 25%,#FBCFE8,#A78BFA 55%,#60A5FA);box-shadow:0 6px 12px -4px rgba(91,33,182,.5);background-size:cover;background-position:center}
.mu-t{min-width:0}.mu-t b{display:block;font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mu-t small{color:var(--muted);font-size:12px}
.mu-bar{height:5px;border-radius:99px;background:color-mix(in srgb,var(--accent2) 22%,transparent);overflow:hidden}.mu-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--pink),var(--accent2),var(--blue))}
.mu-ctl{display:flex;justify-content:center;align-items:center;gap:16px}
.mu-ctl button{border:0;background:none;cursor:pointer;color:var(--accent);padding:4px;display:grid;place-items:center}
.mu-ctl svg{width:20px;height:20px}
.mu-ctl .big{width:40px;height:40px;border-radius:50%;background:linear-gradient(180deg,#C084FC,#7E22CE);color:#fff;box-shadow:0 8px 16px -4px rgba(109,40,217,.6)}
.mu-form{display:flex;gap:6px}.mu-form input{flex:1;min-width:0;border-radius:999px;border:1px solid var(--line);background:var(--card-solid);color:var(--fg);padding:7px 12px;font:inherit;font-size:13px}
.mu-form button{border-radius:999px;border:0;padding:7px 13px;font-weight:600;font-size:13px;cursor:pointer;background:linear-gradient(180deg,#C084FC,#7E22CE);color:#fff}

/* center */
#center{display:flex;flex-direction:column;align-items:center;padding:20px 20px 16px;min-width:0;min-height:0}
.top{align-self:stretch;display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.hi{font-size:20px;font-weight:600}
.chip{background:linear-gradient(180deg,#FFF1B8,#FCD96B);color:#2E1065;border-radius:999px;padding:6px 16px;font-size:14px;font-weight:600;box-shadow:0 6px 14px -8px rgba(91,33,182,.5)}
.stage{display:flex;flex-direction:column;align-items:center;margin-top:6px;flex:0 0 auto}
.orbwrap{position:relative;width:min(300px,34vh);aspect-ratio:1}
.ring{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.orb{position:absolute;inset:19%;border-radius:50%;display:grid;place-items:center;border:0;cursor:pointer;padding:0;
  background:radial-gradient(circle at 34% 26%,rgba(255,255,255,.95) 0%,rgba(233,213,255,.9) 12%,#B77CF5 45%,#6D28D9 80%,#4C1D95 100%);
  box-shadow:inset -14px -18px 36px rgba(59,7,100,.45),inset 10px 12px 26px rgba(255,255,255,.35),0 28px 40px -12px rgba(76,29,149,.55),
    0 0 calc(30px + var(--lo,0)*110px) calc(var(--lo,0)*30px) rgba(192,132,252,calc(.25 + var(--lo,0)*.75));
  filter:brightness(calc(1 + var(--lo,0)*.55)) saturate(calc(1 + var(--lo,0)*.5));
  transform:scale(calc(1 + var(--lo,0)*.08));will-change:transform,filter}
.orb::before{content:"";position:absolute;inset:0;border-radius:50%;background:conic-gradient(from 200deg,rgba(244,114,182,.45),rgba(96,165,250,.45),rgba(74,222,128,.35),rgba(244,114,182,.45));mix-blend-mode:screen;-webkit-mask:radial-gradient(circle,transparent 58%,#000 80%);mask:radial-gradient(circle,transparent 58%,#000 80%)}
.orb::after{content:"";position:absolute;left:14%;top:10%;width:34%;height:17%;border-radius:50%;background:linear-gradient(180deg,rgba(255,255,255,.85),rgba(255,255,255,.1));transform:rotate(-26deg)}
.orb span{font-family:var(--display);font-size:clamp(14px,1.9vh + 4px,24px);letter-spacing:.08em;color:#fff;text-shadow:0 2px 10px rgba(59,7,100,.55);margin-top:12%;position:relative;z-index:1}
.wave{display:flex;gap:5px;align-items:center;justify-content:center;height:30px}
.wave i{display:block;width:7px;height:6px;border-radius:99px;background:var(--accent2)}
.wave i:nth-child(3n+1){background:var(--pink)}.wave i:nth-child(3n+2){background:var(--blue)}.wave i:nth-child(3n){background:var(--green)}
.state{font-size:12px;letter-spacing:.2em;font-weight:600;color:var(--accent);text-transform:uppercase;min-height:16px;margin-top:2px}
.chat{flex:1;min-height:0;align-self:stretch;max-width:900px;width:100%;margin:6px auto 0;overflow-y:auto;display:flex;flex-direction:column;gap:10px;padding:4px 2px 8px;scroll-behavior:smooth}
.m{max-width:90%;padding:10px 16px;border-radius:20px;font-size:16px;line-height:1.45;overflow-wrap:anywhere}
.m.me{align-self:flex-end;background:linear-gradient(180deg,#D7A9FF,#A855F7);color:#fff;border-bottom-right-radius:6px;box-shadow:0 8px 16px -8px rgba(109,40,217,.7)}
.m.bot{align-self:flex-start;background:var(--card-solid);border:1px solid var(--line);border-bottom-left-radius:6px;box-shadow:var(--shadow)}
.m.bot .listen{display:inline-flex;margin-top:6px;border:0;background:none;color:var(--accent);font-size:12px;font-weight:600;cursor:pointer;padding:0}
.m.bot ul{margin:6px 0;padding-left:20px}
.dots{display:inline-flex;gap:5px}.dots i{width:8px;height:8px;border-radius:50%;background:var(--accent2);animation:dd 1s infinite ease-in-out}.dots i:nth-child(2){animation-delay:.15s;background:var(--pink)}.dots i:nth-child(3){animation-delay:.3s;background:var(--blue)}
@keyframes dd{0%,80%,100%{transform:translateY(0);opacity:.5}40%{transform:translateY(-6px);opacity:1}}
.composer{align-self:stretch;max-width:900px;width:100%;margin:0 auto;display:flex;align-items:center;gap:8px;background:var(--card-solid);border:1px solid var(--line);border-radius:999px;padding:6px 6px 6px 20px;box-shadow:var(--shadow)}
.composer input[type=text]{flex:1;min-width:0;border:0;background:none;font:inherit;font-size:16px;color:var(--fg);padding:8px 0}
.composer input:focus-visible{outline:none}
.composer:focus-within{outline:3px solid var(--blue);outline-offset:2px}
.round{width:42px;height:42px;border-radius:50%;border:1px solid var(--line);background:linear-gradient(180deg,#E3EEFF,#8EBDFB);display:grid;place-items:center;cursor:pointer;flex:0 0 42px;padding:0}
.round.hot{background:linear-gradient(180deg,#FFE4F2,#F6A5D0)}
.round.rec{background:linear-gradient(180deg,#F9A8D4,#EC4899);animation:rec 1.2s infinite}
@keyframes rec{50%{box-shadow:0 0 0 8px rgba(236,72,153,.25)}}
.round svg{width:20px;height:20px;fill:none;stroke:#2E1065;stroke-width:2.3;stroke-linecap:round;stroke-linejoin:round}

/* panel */
#right{display:flex;flex-direction:column;min-height:0;padding:16px 22px 18px 6px;gap:8px}
#right .stage{margin-top:0}
#right .orbwrap{width:min(200px,25vh)}
#right .wave{height:22px}
#panel{padding:0 2px 0 0;display:flex;flex-direction:column;gap:14px;overflow-y:auto;min-height:0;flex:1}
.pc{padding:18px}
.pc h2{margin:0 0 8px;font-size:13px;letter-spacing:.14em;text-transform:uppercase;font-weight:600;color:var(--accent)}
.pc h3{margin:0 0 6px;font-size:18px;font-weight:600;line-height:1.3}
.pc p{margin:0 0 10px;font-size:15px;line-height:1.45}
.muted{color:var(--muted)}
.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.btn{border:1px solid var(--line);background:var(--card-solid);border-radius:999px;padding:9px 16px;font-weight:600;font-size:14px;cursor:pointer}
.btn.pri{background:linear-gradient(180deg,#C084FC,#7E22CE);color:#fff;border:0;box-shadow:0 8px 16px -6px rgba(109,40,217,.6)}
.btn.pink{background:linear-gradient(180deg,#FFE4F2,#F6A5D0);border:0}
.btn.green{background:linear-gradient(180deg,#E4FBEA,#7DE0A4);border:0}
.btn.blue{background:linear-gradient(180deg,#E3EEFF,#8EBDFB);border:0}
.btn[disabled]{opacity:.55;cursor:default}
.field{display:flex;flex-direction:column;gap:5px;font-size:13px;color:var(--muted);margin-bottom:10px}
.field input,.field select,.field textarea{font:inherit;font-size:15px;color:var(--fg);background:var(--card-solid);border:1px solid var(--line);border-radius:12px;padding:9px 12px;width:100%}
.opts{display:flex;flex-direction:column;gap:8px;margin:10px 0}
.opt{text-align:left;border:1.5px solid var(--line);background:var(--card-solid);border-radius:14px;padding:10px 14px;font-size:15px;font-weight:500;cursor:pointer;line-height:1.35}
.opt:hover:not([disabled]){border-color:var(--accent)}
.opt.right{background:var(--ok);border-color:#4ADE80;color:var(--okfg);font-weight:600}
.opt.wrong{background:var(--bad);border-color:#F472B6;color:var(--badfg)}
.opt[disabled]{cursor:default}
.expl{background:var(--ok);color:var(--okfg);border-radius:14px;padding:10px 13px;font-size:14px;line-height:1.45;margin-top:8px}
.expl.no{background:var(--bad);color:var(--badfg)}
.prog{height:12px;border-radius:99px;background:color-mix(in srgb,var(--accent2) 22%,transparent);overflow:hidden;border:1px solid var(--line)}
.prog i{display:block;height:100%;background:linear-gradient(90deg,#F472B6,#A855F7,#60A5FA,#4ADE80)}
.stat{display:flex;justify-content:space-between;font-size:16px;font-weight:600;padding:3px 0}
.fc{min-height:170px;display:grid;place-items:center;text-align:center;padding:20px;border-radius:18px;border:1.5px solid var(--line);background:var(--card-solid);cursor:pointer;font-size:19px;font-weight:500;line-height:1.35;margin:10px 0;user-select:none}
.fc.back{background:linear-gradient(180deg,#E4FBEA,#CFF7DB);color:#14532D}
.list{display:flex;flex-direction:column;gap:8px}
.item{display:flex;justify-content:space-between;align-items:center;gap:8px;border:1px solid var(--line);border-radius:14px;padding:9px 12px;background:var(--card-solid)}
.item b{font-weight:600;font-size:14px;overflow-wrap:anywhere}.item small{display:block;color:var(--muted);font-size:12px}
.dz{border:2px dashed var(--line);border-radius:16px;padding:16px;text-align:center;font-size:14px;color:var(--muted);cursor:pointer}
.dz.over{border-color:var(--accent);background:color-mix(in srgb,var(--accent2) 14%,transparent)}
.seg{display:flex;gap:6px;flex-wrap:wrap}
.seg button{border:1px solid var(--line);background:var(--card-solid);border-radius:999px;padding:7px 14px;font-weight:600;font-size:14px;cursor:pointer}
.seg button.on{background:linear-gradient(180deg,#C084FC,#7E22CE);color:#fff;border:0}

/* music tile (kept visible while a song plays, as the player rules ask) */
#ytile{position:fixed;right:14px;bottom:14px;z-index:20;width:232px;background:var(--card-solid);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:hidden}
.ytile-bar{display:flex;justify-content:space-between;align-items:center;padding:6px 10px;font-size:12px;font-weight:600;color:var(--accent)}
.ytile-bar button{border:0;background:none;font-size:12px;font-weight:600;cursor:pointer;color:var(--muted)}
#yplayer,#yplayer iframe{width:232px;height:210px;display:block}
#toast{position:fixed;left:50%;bottom:18px;transform:translate(-50%,30px);opacity:0;pointer-events:none;background:#2E1065;color:#fff;border-radius:999px;padding:10px 18px;font-size:14px;font-weight:500;z-index:30;transition:.25s;max-width:90vw;text-align:center}
#toast.on{opacity:1;transform:translate(-50%,0)}

@media (max-width:1100px){
  body{overflow:auto}
  #app{display:flex;flex-direction:column;height:auto;min-height:100%}
  #side{flex-direction:row;flex-wrap:wrap;padding:12px;overflow:visible}
  .brand{width:100%}.grow{display:none}.music{width:100%}
  #center{min-height:78vh}.orbwrap{width:min(280px,70vw)}
  .chat{min-height:180px}
  #panel{padding:0 14px 90px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;scroll-behavior:auto!important}}

#gate{position:fixed;inset:0;z-index:40;display:grid;place-items:center;background:rgba(46,16,101,.45);backdrop-filter:blur(6px);padding:16px}
.gate-card{width:min(380px,100%);background:var(--card-solid)}

button.brand-btn{background:none;border:0;cursor:pointer;text-align:left;width:100%;border-radius:16px;transition:background .2s}
button.brand-btn:hover{background:rgba(255,255,255,.45)}
button.brand-btn:active .brand-dot{transform:rotate(180deg) scale(.92)}
.brand-dot{transition:transform .35s}
.tools{display:flex;gap:8px;margin-left:auto}
.tool{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--card-solid);border-radius:999px;padding:6px 14px;font-size:14px;font-weight:600;cursor:pointer;color:var(--accent);box-shadow:var(--shadow)}
.tool svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.tool.on{background:linear-gradient(180deg,#E9D5FF,#C084FC);color:#2E1065}
.tool:not(.on) .vw{display:none}
@media (max-width:1100px){#right{padding:0 14px 90px}#right .orbwrap{width:min(220px,60vw)}#panel{overflow:visible}}