/* ============ BOYS DO YOUR SHIT — HUD theme ============ */
@font-face{font-family:"BDYS Display";src:url(../assets/fonts/Orbitron.woff2) format("woff2");font-weight:400 900;font-display:swap}
@font-face{font-family:"BDYS Text";src:url(../assets/fonts/Exo2.woff2) format("woff2");font-weight:100 900;font-display:swap}
:root{
  --bg:#050b14; --bg2:#0a1724; --panel:#0b1b2bf0; --panel2:#0f2436; --ink:#e8f7ff; --muted:#a9c7da; --dim:#6f8ea3;
  --cyan:#2ee6ff; --cyan-d:#0aa9c9; --orange:#ff8a2a; --amber:#ffd23f; --lime:#b6ff3b; --pink:#ff4fd8; --red:#ff5470; --green:#36e27a; --violet:#b388ff;
  --line:#2ee6ff55; --cut:12px; --radius:4px;
  --spring:cubic-bezier(.34,1.56,.64,1);
  --display:"BDYS Display","Orbitron","Eurostile","Arial Black",sans-serif;
  --text:"BDYS Text","Exo 2","Segoe UI",system-ui,sans-serif;
  /* legacy color names used by pages */
  --blue:var(--cyan); --yellow:var(--amber); --purple:var(--violet); --teal:var(--cyan);
}
*{box-sizing:border-box}
html{font-size:18px;background:var(--bg)}
body{margin:0;color:var(--ink);font-family:var(--text);font-weight:500;line-height:1.45;min-height:100vh;position:relative;overflow-x:hidden;
  background:radial-gradient(ellipse 80% 60% at 50% -10%,#0f3a5a 0%,transparent 60%),radial-gradient(ellipse 50% 40% at 100% 100%,#2a1406 0%,transparent 70%),var(--bg)}
body::before{content:"";position:fixed;inset:-80px;z-index:-1;pointer-events:none;
  background-image:linear-gradient(#2ee6ff12 1px,transparent 1px),linear-gradient(90deg,#2ee6ff12 1px,transparent 1px);background-size:44px 44px;
  mask-image:radial-gradient(ellipse at 50% 30%,#000 30%,transparent 80%);-webkit-mask-image:radial-gradient(ellipse at 50% 30%,#000 30%,transparent 80%);
  animation:grid 16s linear infinite}
body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:90;background:repeating-linear-gradient(0deg,#ffffff07 0 1px,transparent 1px 3px);mix-blend-mode:overlay}
@keyframes grid{to{transform:translate(44px,44px)}}
a{color:var(--cyan)}
::selection{background:var(--cyan);color:#001018}
.skip{position:absolute;left:-999px;top:0;background:var(--amber);color:#000;padding:.5rem 1rem;z-index:200}
.skip:focus{left:1rem}
:focus-visible{outline:3px solid var(--amber);outline-offset:3px}
h1,h2,h3,.display{font-family:var(--display);letter-spacing:.04em;text-transform:uppercase}
h1{font-size:1.9rem;margin:.4rem 0 .6rem;font-weight:900;background:linear-gradient(180deg,#fff 0%,#cfe9f7 45%,#6f93ac 52%,#eaf7ff 60%,#9bb9cc 100%);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 10px #2ee6ff55)}
h2{font-size:1.25rem;margin:1.4rem 0 .5rem;color:var(--cyan);font-weight:800}
h3{font-size:1rem;color:var(--muted);font-weight:700}
.lead{font-size:1.1rem;color:var(--muted);margin-top:0}
.lead::before{content:"// ";color:var(--cyan)}
main{max-width:1140px;margin:0 auto;padding:1.2rem;position:relative}
/* ---------- header ---------- */
header.top{position:sticky;top:0;z-index:80;display:flex;align-items:center;gap:.8rem;flex-wrap:nowrap;padding:.4rem 1rem;
  background:linear-gradient(180deg,#071522f5,#050d17ee);border-bottom:1px solid var(--line);box-shadow:0 0 24px #2ee6ff22;backdrop-filter:blur(6px)}
header.top::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:linear-gradient(90deg,transparent,var(--cyan),transparent);animation:scan 4s ease-in-out infinite;opacity:.8}
@keyframes scan{0%,100%{transform:scaleX(.2) translateX(-150%)}50%{transform:scaleX(.4) translateX(150%)}}
header.top .logo{display:flex;align-items:center;transition:transform .3s var(--spring)}
header.top .logo:hover{transform:scale(1.04)}
header.top .logo img{height:64px;width:auto;display:block}
header.top nav{display:flex;flex-wrap:wrap;gap:.1rem;margin-left:auto;justify-content:flex-end}
header.top nav a{color:var(--muted);text-decoration:none;padding:.5rem .6rem;font-family:var(--display);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;font-weight:700;
  min-height:44px;display:inline-flex;align-items:center;position:relative;transition:color .2s,transform .25s var(--spring)}
header.top nav a::after{content:"";position:absolute;left:.75rem;right:.75rem;bottom:6px;height:2px;background:var(--cyan);transform:scaleX(0);transition:transform .25s var(--spring);box-shadow:0 0 8px var(--cyan)}
header.top nav a:hover{color:#fff;transform:translateY(-1px)}
header.top nav a:hover::after,header.top nav a[aria-current="page"]::after{transform:scaleX(1)}
header.top nav a[aria-current="page"]{color:var(--cyan)}
.hud-right{display:flex;align-items:center;gap:.5rem;flex-shrink:0}
html,body{overflow-x:clip}
@media (max-width:1400px){.hud-right .guest-tag{display:none}}
.chip{display:inline-flex;align-items:center;gap:.45rem;min-height:44px;padding:.3rem .9rem .3rem .5rem;color:var(--ink);text-decoration:none;font-weight:800;
  background:linear-gradient(180deg,#13324a,#0a1a29);border:1px solid var(--line);clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);transition:transform .25s var(--spring),filter .2s}
.chip:hover{transform:scale(1.05);filter:brightness(1.25)}
.chip .av{font-size:1.4rem}
#sync-dot{width:9px;height:9px;border-radius:50%;background:var(--green);box-shadow:0 0 8px var(--green);display:inline-block}
#sync-dot[data-state="offline"]{background:var(--amber);box-shadow:0 0 8px var(--amber)}
.guest-tag{font-family:var(--display);font-size:.6rem;letter-spacing:.15em;color:var(--amber);border:1px solid #ffd23f66;padding:.2rem .4rem}
.icon-btn{min-width:48px!important;padding:.4rem!important;font-size:1.3rem!important}
/* ---------- panels ---------- */
.card,fieldset{background:linear-gradient(180deg,#0e2335f2,#081624f2);border:1px solid var(--line);padding:1.2rem;position:relative;
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
  box-shadow:inset 0 0 0 1px #2ee6ff22,inset 0 0 40px #2ee6ff10}
.card::before{content:"";position:absolute;top:0;left:var(--cut);width:70px;height:3px;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
fieldset{margin:0 0 1rem}
legend{font-family:var(--display);font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan);font-weight:800;padding:.2rem .5rem;float:left;width:100%;margin-bottom:.5rem}
legend+*{clear:both}
/* ---------- buttons ---------- */
button,.btn{font:inherit;font-family:var(--display);font-weight:800;font-size:.82rem;letter-spacing:.08em;text-transform:uppercase;
  border:0;padding:.75rem 1.2rem;min-height:52px;min-width:52px;cursor:pointer;color:#02121b;text-decoration:none;
  display:inline-flex;align-items:center;justify-content:center;gap:.45rem;position:relative;
  background:linear-gradient(180deg,#9ff6ff 0%,#2ee6ff 45%,#0bb6d6 55%,#33d9f5 100%);
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  box-shadow:inset 0 1px 0 #ffffffaa,inset 0 -3px 0 #00000033;
  transition:transform .28s var(--spring),filter .2s}
button:hover:not(:disabled),.btn:hover{transform:translateY(-2px) scale(1.04);filter:brightness(1.15) drop-shadow(0 0 0 transparent)}
button:active:not(:disabled),.btn:active{transform:scale(.93,.88);transition-duration:.08s}
button:focus-visible,.btn:focus-visible{outline:none;box-shadow:inset 0 0 0 3px var(--amber),inset 0 0 18px #ffd23f88;filter:brightness(1.2)}
button:disabled{opacity:.45;cursor:not-allowed}
button.secondary,.btn.secondary,button[aria-pressed="false"]{color:var(--ink);background:linear-gradient(180deg,#183850,#0b1c2c);box-shadow:inset 0 0 0 1px #2ee6ff66,inset 0 1px 0 #ffffff22}
button.secondary:focus-visible,.btn.secondary:focus-visible,button[aria-pressed="false"]:focus-visible{box-shadow:inset 0 0 0 3px var(--amber)}
button[aria-pressed="true"]{color:#02121b;background:linear-gradient(180deg,#fff2b8,#ffd23f 50%,#f5b400 56%,#ffd75a);box-shadow:inset 0 0 0 2px #fff6,0 0 0 transparent}
button.green,.btn.green{background:linear-gradient(180deg,#b9ffd3,#36e27a 50%,#1fbf5e 56%,#4ee98c)}
button.red,.btn.red{background:linear-gradient(180deg,#ffc2cc,#ff5470 50%,#e23a57 56%,#ff6b84)}
button.orange,.btn.orange{background:linear-gradient(180deg,#ffd6b0,#ff8a2a 50%,#ec6d0c 56%,#ff9d48)}
button.purple,.btn.purple{background:linear-gradient(180deg,#e6d8ff,#b388ff 50%,#9466f0 56%,#bf9bff)}
.squish{animation:squish .45s var(--spring)}
@keyframes squish{0%{transform:scale(1)}30%{transform:scale(1.12,.86)}55%{transform:scale(.94,1.08)}75%{transform:scale(1.03,.97)}100%{transform:scale(1)}}
.shake{animation:shake .45s ease}
@keyframes shake{20%{transform:translateX(-10px)}40%{transform:translateX(9px)}60%{transform:translateX(-6px)}80%{transform:translateX(4px)}}
.row{display:flex;flex-wrap:wrap;gap:.6rem;align-items:center}
.spacer{flex:1}
/* ---------- home tiles ---------- */
.grid-home{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.1rem;margin-top:.8rem;perspective:900px}
.big-btn{--rx:0deg;--ry:0deg;--mx:50%;--my:50%;--acc:var(--cyan);display:flex;flex-direction:column;align-items:flex-start;gap:.35rem;padding:1.3rem 1.4rem;text-decoration:none;color:var(--ink);min-height:160px;position:relative;
  background:radial-gradient(circle at var(--mx) var(--my),color-mix(in srgb,var(--acc) 22%,transparent),transparent 55%),linear-gradient(160deg,#123049,#091726 70%);
  border:1px solid color-mix(in srgb,var(--acc) 45%,transparent);
  clip-path:polygon(18px 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%,0 18px);
  transform:rotateX(var(--rx)) rotateY(var(--ry));transform-style:preserve-3d;transition:transform .35s var(--spring),filter .2s;
  box-shadow:inset 0 0 30px color-mix(in srgb,var(--acc) 12%,transparent)}
.big-btn::before{content:"";position:absolute;left:18px;top:0;height:3px;width:40%;background:var(--acc);box-shadow:0 0 12px var(--acc);transition:width .4s var(--spring)}
.big-btn::after{content:"▶";position:absolute;right:16px;bottom:12px;color:var(--acc);font-size:.8rem;opacity:.6;transition:transform .3s var(--spring),opacity .2s}
.big-btn:hover{filter:brightness(1.18)}
.big-btn:hover::before{width:75%}
.big-btn:hover::after{transform:translateX(5px);opacity:1}
.big-btn:focus-visible{outline:none;box-shadow:inset 0 0 0 3px var(--amber)}
.big-btn .emoji{font-size:2.4rem;line-height:1;filter:drop-shadow(0 0 8px color-mix(in srgb,var(--acc) 60%,transparent));transform:translateZ(30px);transition:transform .35s var(--spring)}
.big-btn:hover .emoji{transform:translateZ(40px) scale(1.15) rotate(-6deg)}
.big-btn strong{font-family:var(--display);font-size:1.05rem;letter-spacing:.06em;text-transform:uppercase;transform:translateZ(20px)}
.big-btn span.desc{color:var(--muted);font-weight:600}
.big-btn .tag{font-family:var(--display);font-size:.58rem;letter-spacing:.14em;color:var(--acc);text-transform:uppercase}
.c-blue,.c-teal{--acc:var(--cyan)} .c-green{--acc:var(--green)} .c-yellow{--acc:var(--amber)} .c-purple{--acc:var(--violet)} .c-orange{--acc:var(--orange)} .c-pink{--acc:var(--pink)} .c-red{--acc:var(--red)} .c-lime{--acc:var(--lime)}
.section-title{display:flex;align-items:center;gap:.6rem;font-size:1.15rem;margin:1.8rem 0 .2rem;color:var(--ink)}
.section-title::after{content:"";flex:1;height:1px;background:linear-gradient(90deg,var(--line),transparent)}
.section-title small{font-family:var(--text);font-size:.75rem;color:var(--dim);letter-spacing:.1em}
/* ---------- map ---------- */
svg.usmap{width:100%;height:auto;display:block;touch-action:manipulation;filter:drop-shadow(0 0 12px #2ee6ff33)}
svg.usmap path.st{fill:#123552;stroke:#2ee6ffaa;stroke-width:1;cursor:pointer;transition:fill .15s;-webkit-tap-highlight-color:transparent}
svg.usmap path.st:hover{fill:#1f6b93}
svg.usmap path.st:focus{outline:none;fill:#ffd23f;stroke:#fff;stroke-width:2}
svg.usmap path.st.visited{fill:#0f6157}
svg.usmap path.st.selected{fill:#ff8a2a;stroke:#fff;stroke-width:2}
svg.usmap path.st.right{fill:#36e27a}
svg.usmap path.st.wrong{fill:#ff5470}
svg.usmap path.st.reveal{fill:#36e27a;animation:pulse .6s ease-in-out 3}
@keyframes pulse{50%{fill:#ffd23f}}
.small-states{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.6rem;align-items:center;color:var(--muted)}
.small-states button{min-width:60px;padding:.4rem .6rem;font-size:.75rem;min-height:44px}
.small-states button.right{background:var(--green);color:#000} .small-states button.wrong{background:var(--red);color:#000}
.small-states button.selected{background:var(--orange);color:#000}
.info{min-height:120px}
.info .state-name{font-family:var(--display);font-size:1.6rem;font-weight:900;margin:0;color:#fff;text-shadow:0 0 14px #2ee6ff88}
.info .capital{font-size:1.3rem;color:var(--ink)}
.info .capital strong{color:var(--amber)}
.layout-2{display:grid;grid-template-columns:2.2fr 1fr;gap:1rem;align-items:start}
@media (max-width:820px){.layout-2{grid-template-columns:1fr}}
/* ---------- flashcards ---------- */
.flash{perspective:1200px;width:min(560px,100%);height:300px;margin:1rem auto;cursor:pointer;background:none!important;border:0;padding:0;box-shadow:none!important;display:block;color:inherit;clip-path:none;text-transform:none;letter-spacing:0}
.flash:hover:not(:disabled){transform:translateY(-4px) scale(1.02)}
.flash .inner{display:block;position:relative;width:100%;height:100%;transition:transform .6s var(--spring);transform-style:preserve-3d}
.flash.flipped .inner{transform:rotateY(180deg)}
.flash .face{position:absolute;inset:0;backface-visibility:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1rem;
  font-family:var(--display);font-size:2.1rem;font-weight:900;text-align:center;color:#fff;
  clip-path:polygon(24px 0,100% 0,100% calc(100% - 24px),calc(100% - 24px) 100%,0 100%,0 24px)}
.flash .front{background:radial-gradient(circle at 30% 20%,#1d5b80,#0a1a2a 70%);box-shadow:inset 0 0 0 2px var(--cyan),inset 0 0 60px #2ee6ff33;text-shadow:0 0 16px #2ee6ff}
.flash .back{background:radial-gradient(circle at 70% 20%,#6a3a10,#1a0f06 70%);box-shadow:inset 0 0 0 2px var(--orange),inset 0 0 60px #ff8a2a44;transform:rotateY(180deg);text-shadow:0 0 16px #ff8a2a}
.flash:focus-visible{outline:none}.flash:focus-visible .face{box-shadow:inset 0 0 0 4px var(--amber)}
.flash .hint{font-family:var(--text);font-size:.95rem;font-weight:700;color:var(--muted);margin-top:.6rem;text-shadow:none}
.flash .known-badge{position:absolute;top:14px;right:20px;font-family:var(--display);font-size:.7rem;background:var(--green);color:#000;padding:.25rem .6rem;text-shadow:none}
/* ---------- quiz ---------- */
.q-prompt{font-family:var(--display);font-size:1.6rem;font-weight:900;text-align:center;margin:.6rem 0 1rem;color:#fff;text-shadow:0 0 14px #2ee6ff66}
#play .q-prompt{position:sticky;top:80px;background:#081624ee;z-index:2;padding:.5rem}
.choices{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.8rem}
.choices button{font-size:1.05rem;min-height:72px;text-transform:none;letter-spacing:.03em;color:var(--ink);background:linear-gradient(180deg,#183850,#0b1c2c);box-shadow:inset 0 0 0 1px #2ee6ff66}
.choices button.right{background:var(--green);color:#000} .choices button.wrong{background:var(--red);color:#000}
.choices button:disabled{opacity:1;cursor:default}
.choices button:disabled:not(.right):not(.wrong){color:var(--dim)}
.feedback{font-family:var(--display);font-size:1.05rem;font-weight:800;min-height:2.2em;text-align:center;margin:.6rem 0;letter-spacing:.03em}
.feedback.good{color:var(--green);text-shadow:0 0 12px #36e27a88} .feedback.bad{color:#ff8ea0;text-shadow:0 0 12px #ff547088}
input[type=text],input[type=number],input[type=email],input[type=password],select{font:inherit;font-size:1.25rem;padding:.6rem .9rem;min-height:56px;width:min(420px,100%);
  color:#fff;background:#04101b;border:1px solid #2ee6ff88;box-shadow:inset 0 0 18px #2ee6ff22;border-radius:0;transition:box-shadow .2s,border-color .2s}
input[type=text]{text-align:center}
input:focus-visible,select:focus-visible{outline:none;border-color:var(--amber);box-shadow:0 0 0 2px var(--amber),inset 0 0 18px #ffd23f33}
input::placeholder{color:#5f7d92}
.scorebar{display:flex;gap:.7rem;flex-wrap:wrap;justify-content:center;font-weight:800}
.pill{font-family:var(--display);font-size:.78rem;letter-spacing:.06em;color:var(--ink);background:#06121e;border:1px solid var(--line);padding:.45rem .9rem;
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);display:inline-block}
.tabs{display:flex;flex-wrap:wrap;gap:.5rem;margin:.2rem 0 .4rem}
.checks{display:flex;flex-wrap:wrap;gap:.45rem}
.checks label{display:inline-flex;align-items:center;justify-content:center;min-width:56px;min-height:52px;font-family:var(--display);font-weight:900;font-size:1rem;cursor:pointer;user-select:none;
  color:var(--muted);background:#0b1c2c;box-shadow:inset 0 0 0 1px #2ee6ff55;clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);transition:transform .25s var(--spring)}
.checks label:hover{transform:scale(1.08)}
.checks input{position:absolute;opacity:0;width:1px;height:1px}
.checks label:has(input:checked){background:linear-gradient(180deg,#e6d8ff,#b388ff 50%,#9466f0 56%,#bf9bff);color:#12002b}
.checks label:has(input:focus-visible){box-shadow:inset 0 0 0 3px var(--amber)}
/* ---------- math ---------- */
.math-q{font-family:var(--display);font-size:3.6rem;font-weight:900;text-align:center;margin:.4rem 0;letter-spacing:.04em;color:#fff;text-shadow:0 0 22px #2ee6ffaa}
.math-q.pop{animation:pop .35s var(--spring)}
@keyframes pop{0%{transform:scale(.7);opacity:.2}100%{transform:scale(1);opacity:1}}
.keypad{display:grid;grid-template-columns:repeat(3,84px);gap:.5rem;justify-content:center;margin-top:.8rem}
.keypad button{font-size:1.5rem;min-height:66px;color:var(--ink);background:linear-gradient(180deg,#183850,#0b1c2c);box-shadow:inset 0 0 0 1px #2ee6ff66}
.keypad button.green{background:linear-gradient(180deg,#b9ffd3,#36e27a 50%,#1fbf5e 56%,#4ee98c);color:#000}
#streak.on-fire{color:#000;background:linear-gradient(180deg,#ffe27a,#ff8a2a);border-color:#ffd23f;box-shadow:0 0 18px #ff8a2a;animation:fire .5s ease-in-out infinite alternate}
#streak.on-fire.inferno{background:linear-gradient(180deg,#fff,#ff4fd8 40%,#ff8a2a);animation-duration:.25s}
@keyframes fire{from{filter:brightness(1) drop-shadow(0 0 4px #ff8a2a)}to{filter:brightness(1.3) drop-shadow(0 -6px 10px #ffd23f)}}
#timer-pill.low{color:#000;background:var(--red);animation:fire .4s infinite alternate}
table.tt{border-collapse:separate;border-spacing:3px;margin:0 auto;font-family:var(--display);font-weight:800}
table.tt th,table.tt td{width:50px;height:44px;text-align:center;font-size:.85rem}
table.tt th{background:#123552;color:var(--cyan)}
table.tt td{background:#081a29;color:var(--ink);cursor:pointer;box-shadow:inset 0 0 0 1px #2ee6ff22;transition:transform .2s var(--spring)}
table.tt td:hover,table.tt td:focus{background:#1f6b93;outline:none;transform:scale(1.12);position:relative;z-index:1}
table.tt td.hl,table.tt th.hl{background:#3a2a07;color:var(--amber)}
table.tt td.sq{color:var(--violet)}
table.tt td.sel{background:var(--orange)!important;color:#000;transform:scale(1.15)}
.tt-scroll{overflow-x:auto;padding:.3rem}
.heat{display:grid;grid-template-columns:repeat(var(--n,13),minmax(22px,1fr));gap:3px;font-size:.7rem;font-weight:800;max-width:600px;font-family:var(--display)}
.heat div{aspect-ratio:1;display:flex;align-items:center;justify-content:center;background:#0f2234;color:var(--dim)}
.heat .h{background:#123552;color:var(--cyan)}
.heat .weak{background:#ff5470;color:#000} .heat .learning{background:#ffd23f;color:#000} .heat .mastered{background:#36e27a;color:#000}
.legend{display:flex;gap:.8rem;flex-wrap:wrap;font-weight:700;margin:.5rem 0;color:var(--muted)}
.legend i{display:inline-block;width:16px;height:16px;vertical-align:middle;margin-right:.3rem}
table.data{border-collapse:collapse;width:100%;background:#081624}
table.data th,table.data td{padding:.55rem .7rem;border-bottom:1px solid #2ee6ff22;text-align:left}
table.data th{font-family:var(--display);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--cyan);background:#0d2234}
.hidden{display:none!important}
.center{text-align:center}
.big-number{font-family:var(--display);font-size:3rem;font-weight:900;color:var(--amber);text-shadow:0 0 20px #ffd23f88}
/* ---------- particles & confetti ---------- */
.burst{position:fixed;width:0;height:0;pointer-events:none;z-index:120}
.burst i{position:absolute;width:7px;height:7px;border-radius:50%;left:-3px;top:-3px;box-shadow:0 0 8px currentColor;animation:burst .7s cubic-bezier(.1,.8,.3,1) forwards}
.burst i.sq{border-radius:0;width:9px;height:3px}
@keyframes burst{to{transform:translate(var(--dx),var(--dy)) rotate(200deg);opacity:0}}
.confetti{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:120}
.confetti i{position:absolute;top:-20px;width:10px;height:16px;animation:fall 2.2s linear forwards;box-shadow:0 0 6px currentColor}
@keyframes fall{to{transform:translateY(110vh) rotate(720deg)}}
/* ---------- mascot ---------- */
.mascot{position:fixed;right:14px;bottom:14px;z-index:110;display:flex;align-items:flex-end;gap:.4rem;pointer-events:none}
.mascot .bot{pointer-events:auto;width:84px;height:84px;padding:0;min-height:0;background:none!important;box-shadow:none!important;clip-path:none;animation:bob 3s ease-in-out infinite}
.mascot .bot svg{width:100%;height:100%;filter:drop-shadow(0 0 10px #2ee6ff77)}
.mascot .bubble{font-family:var(--display);font-size:.78rem;letter-spacing:.05em;color:#02121b;background:var(--cyan);padding:.55rem .8rem;max-width:230px;opacity:0;transform:translateY(10px) scale(.8);transform-origin:right bottom;
  transition:opacity .2s,transform .35s var(--spring);clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px)}
.mascot.show .bubble{opacity:1;transform:none}
.mascot .flames{opacity:0;transition:opacity .2s}
.mascot.mood-fire .flames,.mascot.mood-levelup .flames{opacity:1;animation:flick .2s infinite alternate}
.mascot.mood-happy .bot,.mascot.mood-levelup .bot{animation:hop .5s var(--spring) 2}
.mascot.mood-sad .bot{animation:shake .45s}
.mascot.mood-sad .eye{fill:#ff5470;height:6px;y:58px}
.mascot.mood-sad .bubble{background:#ff8ea0}
.mascot.mood-fire .bubble,.mascot.mood-levelup .bubble{background:var(--amber)}
.mascot.mood-happy .eye,.mascot.mood-levelup .eye{fill:var(--lime)}
.mascot .ant{animation:blink 1.2s steps(2) infinite}
@keyframes bob{50%{transform:translateY(-6px)}}
@keyframes hop{40%{transform:translateY(-22px) rotate(-6deg)}}
@keyframes flick{to{transform:translateY(-3px) scaleY(1.15)}}
@keyframes blink{50%{opacity:.25}}
/* ---------- intro ---------- */
.intro{position:fixed;inset:0;z-index:150;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1.2rem;cursor:pointer;
  background:radial-gradient(ellipse at 50% 45%,#0e3350 0%,#03070d 70%);animation:introOut .6s 3.3s forwards}
.intro img{width:min(880px,92vw);animation:introIn 1.1s var(--spring)}
.intro .boot{font-family:var(--display);font-size:.75rem;letter-spacing:.3em;color:var(--cyan)}
.intro .boot::after{content:"";display:block;height:2px;margin-top:.5rem;background:var(--cyan);box-shadow:0 0 10px var(--cyan);animation:load 2.6s ease-out forwards;transform-origin:left;transform:scaleX(0)}
.intro .skipit{font-size:.7rem;color:var(--dim);font-family:var(--display);letter-spacing:.2em}
@keyframes introIn{from{transform:scale(1.6);opacity:0;filter:blur(12px)}to{transform:none;opacity:1;filter:none}}
@keyframes introOut{to{opacity:0;visibility:hidden;transform:scale(1.04)}}
@keyframes load{to{transform:scaleX(1)}}
.intro.gone{display:none}
/* ---------- page transitions ---------- */
main{animation:enter .5s var(--spring) both}
@keyframes enter{from{opacity:0;transform:translateY(18px) scale(.985);filter:blur(4px)}to{opacity:1;transform:none;filter:none}}
html.leaving main{animation:leave .23s ease-in forwards}
html.leaving body::after{background:linear-gradient(180deg,transparent 0%,#2ee6ff33 50%,transparent 100%);background-size:100% 30%;animation:wipe .23s linear}
@keyframes leave{to{opacity:0;transform:translateY(-10px) scale(.98);filter:blur(3px)}}
@keyframes wipe{from{background-position:0 -100%}to{background-position:0 200%}}
/* ---------- auth & profiles ---------- */
.auth{max-width:520px;margin:1rem auto}
.field{display:flex;flex-direction:column;gap:.3rem;margin-bottom:.9rem}
.field label{font-family:var(--display);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--cyan)}
.field input,.field select{width:100%;text-align:left}
.field .help{color:var(--dim);font-size:.85rem}
.error{color:#ff8ea0;font-weight:700;min-height:1.4em}
.ok-msg{color:var(--green);font-weight:700}
.profiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:1rem;margin:1rem 0}
.profile-tile{flex-direction:column;min-height:190px;text-transform:none;letter-spacing:.02em;color:var(--ink)!important;background:linear-gradient(160deg,#123049,#091726 70%)!important;box-shadow:inset 0 0 0 1px #2ee6ff66!important}
.profile-tile .av{font-size:3.4rem;filter:drop-shadow(0 0 10px #2ee6ff88);transition:transform .35s var(--spring)}
.profile-tile:hover .av{transform:scale(1.2) rotate(-8deg)}
.profile-tile .nm{font-size:1.05rem}
.profile-tile .gr{font-family:var(--text);color:var(--muted);font-size:.85rem}
.profile-tile.active{box-shadow:inset 0 0 0 3px var(--amber)!important}
.avatar-pick{display:flex;flex-wrap:wrap;gap:.4rem}
.avatar-pick label{font-size:1.8rem;width:58px;height:58px;display:flex;align-items:center;justify-content:center;cursor:pointer;background:#0b1c2c;box-shadow:inset 0 0 0 1px #2ee6ff44;transition:transform .25s var(--spring)}
.avatar-pick label:hover{transform:scale(1.12)}
.avatar-pick input{position:absolute;opacity:0;width:1px;height:1px}
.avatar-pick label:has(input:checked){background:#3a2a07;box-shadow:inset 0 0 0 3px var(--amber)}
.avatar-pick label:has(input:focus-visible){outline:3px solid var(--amber)}
.pin-dots{display:flex;gap:.6rem;justify-content:center;margin:.6rem 0}
.pin-dots i{width:18px;height:18px;border:2px solid var(--cyan);transform:rotate(45deg)}
.pin-dots i.on{background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
dialog{background:#071522;color:var(--ink);border:1px solid var(--cyan);padding:1.4rem;max-width:460px;width:92vw;box-shadow:0 0 40px #2ee6ff44}
dialog::backdrop{background:#000a;backdrop-filter:blur(3px)}
footer{text-align:center;color:var(--dim);padding:2rem 1rem 7rem;font-size:.72rem;font-family:var(--display);letter-spacing:.15em}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
@media (max-width:1240px){header.top{flex-wrap:wrap} header.top .hud-right{margin-left:auto} header.top nav{margin-left:0;order:3;width:100%;justify-content:flex-start}}
@media (max-width:900px){header.top .logo img{height:52px}}
@media (max-width:600px){html{font-size:16px}.math-q{font-size:2.7rem}.flash{height:240px}.flash .face{font-size:1.6rem}.mascot .bot{width:64px;height:64px}}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .intro{display:none} .big-btn{transform:none!important}
}

/* ---------- memory hints ---------- */
.hint-btn{min-height:40px;font-size:.75rem;margin:.2rem auto}
.hint-text{max-width:640px;margin:.5rem auto;padding:.7rem 1rem;background:#1b1530;border-left:4px solid var(--violet);color:#efe6ff;font-weight:600;font-size:1.05rem;text-align:left}

/* ---------- Daily Mission ---------- */
.mission-head{display:flex;flex-wrap:wrap;gap:.6rem;align-items:center;margin-bottom:1rem}
.mission-bar{flex:1;min-width:200px;height:14px;background:#0f2234;clip-path:polygon(6px 0,100% 0,calc(100% - 6px) 100%,0 100%);overflow:hidden}
.mission-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan),var(--lime));box-shadow:0 0 12px var(--cyan);transition:width .4s var(--spring)}
.mission-kind{font-family:var(--display);font-size:.7rem;letter-spacing:.18em;color:var(--lime);text-transform:uppercase}
.box-row{display:flex;gap:4px;align-items:flex-end;height:70px;margin:.4rem 0}
.box-row div{flex:1;background:linear-gradient(180deg,var(--cyan),#0a5d73);min-height:3px;position:relative}
.box-row div span{position:absolute;bottom:-1.3rem;left:0;right:0;text-align:center;font-size:.65rem;color:var(--dim);font-family:var(--display)}
.deck-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}

/* ---------- Beat Arcade (rhythm games) ---------- */
.arcade-games{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin:1rem 0}
.game-pick{text-align:left;display:flex;flex-direction:column;gap:.3rem;min-height:140px;align-items:flex-start;justify-content:flex-start;padding:1rem 1.1rem}
.game-pick .emoji{font-size:2rem}
.game-pick[aria-pressed="true"]{box-shadow:inset 0 0 0 2px var(--amber),0 0 24px #ffd23f55}
.opt-row{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;margin:.5rem 0}
.opt-row > b{font-family:var(--display);font-size:.72rem;letter-spacing:.14em;color:var(--cyan);min-width:110px;text-transform:uppercase}
.rg-wrap{position:relative;user-select:none;-webkit-user-select:none;touch-action:none}
.rg-top{display:flex;justify-content:space-between;align-items:center;gap:.6rem;flex-wrap:wrap;margin-bottom:.5rem}
.rg-q{font-family:var(--display);font-size:clamp(1.6rem,4.5vw,2.8rem);font-weight:900;text-align:center;color:#fff;text-shadow:0 0 18px #2ee6ffaa;min-height:1.3em;margin:.2rem 0}
.rg-q small{display:block;font-size:.4em;letter-spacing:.25em;color:var(--lime);text-shadow:none}
.rg-seq{font-family:var(--display);text-align:center;color:var(--muted);letter-spacing:.12em;min-height:1.4em}
.rg-seq b{color:var(--lime)}
#rg-canvas{display:block;width:100%;height:min(56vh,520px);background:linear-gradient(180deg,#02060c,#071624 70%,#0b2136);clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));cursor:pointer}
.rg-hud{display:flex;gap:.5rem;flex-wrap:wrap}
.rg-hud .pill b{color:#fff}
.star-meter{width:140px;height:14px;background:#1a1030;box-shadow:inset 0 0 0 1px #ff4fd899;position:relative;clip-path:polygon(5px 0,100% 0,calc(100% - 5px) 100%,0 100%)}
.star-meter i{position:absolute;inset:0 auto 0 0;width:0;background:linear-gradient(90deg,var(--violet),var(--pink));box-shadow:0 0 12px var(--pink)}
.star-meter.ready i{animation:pulse 0.6s ease-in-out infinite alternate}
@keyframes pulse{to{filter:brightness(1.6)}}
.rg-wrap.star #rg-canvas{box-shadow:0 0 0 2px var(--pink),0 0 40px #ff4fd855}
.results-grade{font-family:var(--display);font-size:5rem;font-weight:900;line-height:1;background:linear-gradient(180deg,#fff,#ffd23f 55%,#ff8a2a);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 18px #ffd23f88)}
.results-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:.6rem;margin:1rem 0}
.results-grid div{background:#0f2234;padding:.6rem;text-align:center;clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px)}
.results-grid b{display:block;font-family:var(--display);font-size:1.5rem;color:#fff}
.results-grid span{font-size:.75rem;color:var(--muted);letter-spacing:.1em;text-transform:uppercase}
input[type=range]{accent-color:var(--cyan);width:220px}
@media (prefers-reduced-motion: reduce){ .star-meter.ready i{animation:none} }