/* Arcade overlay. Uses the site's theme variables so it follows light/dark with the
   rest of the page, and is laid out phone-first — most learners play on a phone. */

#arcadeOverlay{
  position:fixed;inset:0;z-index:2000;display:flex;align-items:center;justify-content:center;
  padding:16px;background:rgba(4,10,26,.78);backdrop-filter:blur(6px);
  animation:arcIn .18s ease
}
@keyframes arcIn{from{opacity:0}to{opacity:1}}

.arc-shell{
  width:100%;max-width:660px;max-height:94vh;display:flex;flex-direction:column;
  background:var(--bg-1,#0d1630);color:#fff;border:1px solid rgba(255,255,255,.12);
  border-radius:20px;overflow:hidden;box-shadow:0 26px 70px rgba(0,0,0,.5)
}
.arc-shell.good{animation:arcGood .32s ease}
.arc-shell.bad{animation:arcBad .32s ease}
@keyframes arcGood{0%{box-shadow:0 0 0 0 rgba(16,185,129,.55)}100%{box-shadow:0 0 0 18px rgba(16,185,129,0)}}
@keyframes arcBad{0%,100%{transform:translateX(0)}25%{transform:translateX(-7px)}75%{transform:translateX(7px)}}

.arc-head{display:flex;align-items:center;justify-content:space-between;padding:15px 18px;border-bottom:1px solid rgba(255,255,255,.1)}
.arc-title{font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:1.02rem;display:flex;align-items:center;gap:9px}
.arc-x{background:rgba(255,255,255,.08);color:#fff;width:32px;height:32px;border-radius:50%;font-size:.9rem;flex-shrink:0}
.arc-x:hover{background:rgba(255,255,255,.18)}

.arc-hud{display:flex;gap:10px;padding:12px 18px 10px}
.arc-stat{flex:1;text-align:center;background:rgba(255,255,255,.06);border-radius:11px;padding:8px 4px}
.arc-stat b{display:block;font-family:'Space Grotesk',sans-serif;font-size:1.18rem;line-height:1.15}
.arc-stat span{font-size:.62rem;text-transform:uppercase;letter-spacing:.06em;opacity:.55}

.arc-bar{height:3px;background:rgba(255,255,255,.1);margin:0 18px}
.arc-bar i{display:block;height:100%;width:100%;background:var(--green,#10b981);transition:width 1s linear}

.arc-body{flex:1;overflow-y:auto;padding:18px;display:flex;flex-direction:column;justify-content:center;min-height:270px}
.arc-foot{padding:11px 18px;border-top:1px solid rgba(255,255,255,.1);font-size:.76rem;opacity:.65;min-height:38px;text-align:center}
.arc-note{color:#fcd34d;opacity:1}

.arc-q{text-align:center}
.arc-kicker{font-size:.7rem;text-transform:uppercase;letter-spacing:.09em;opacity:.55;margin-bottom:8px}
.arc-prompt{font-family:'Space Grotesk',sans-serif;font-size:1.7rem;font-weight:700;line-height:1.25;margin-bottom:6px;word-break:break-word}
.arc-prompt.small{font-size:1.04rem;font-weight:600;line-height:1.45}
.arc-subprompt{font-size:.84rem;opacity:.7;margin-bottom:6px}

.arc-opts{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:16px}
.arc-opt{
  display:flex;align-items:center;gap:9px;text-align:left;padding:13px 14px;border-radius:12px;
  background:rgba(255,255,255,.07);border:1.5px solid rgba(255,255,255,.12);color:#fff;
  font-size:.9rem;font-weight:600;line-height:1.35;transition:.14s
}
.arc-opt:hover:not(:disabled){border-color:var(--green,#10b981);background:rgba(16,185,129,.14)}
.arc-opt:disabled{cursor:default}
.arc-opt.right{background:rgba(16,185,129,.28);border-color:#10b981}
.arc-opt.wrong{background:rgba(239,68,68,.25);border-color:#ef4444}
.arc-key{flex-shrink:0;width:21px;height:21px;border-radius:6px;background:rgba(255,255,255,.14);font-size:.7rem;display:flex;align-items:center;justify-content:center;opacity:.8}

.arc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin-top:16px}
.arc-cell{
  aspect-ratio:1;border-radius:12px;background:rgba(255,255,255,.07);
  border:1.5px solid rgba(255,255,255,.12);color:#fff;
  font-family:'Space Grotesk',sans-serif;font-size:1.25rem;font-weight:700;transition:.14s
}
.arc-cell:hover:not(:disabled){border-color:var(--green,#10b981);background:rgba(16,185,129,.16)}
.arc-cell.right{background:rgba(16,185,129,.3);border-color:#10b981}
.arc-cell.wrong{background:rgba(239,68,68,.28);border-color:#ef4444}

.arc-matrix{display:grid;gap:7px;margin:16px auto 0;max-width:330px}
.arc-mcell{aspect-ratio:1;border-radius:9px;background:rgba(255,255,255,.07);border:1.5px solid rgba(255,255,255,.1);transition:.13s}
.arc-mcell.lit{background:var(--green,#10b981);border-color:#34d399;box-shadow:0 0 14px rgba(16,185,129,.5)}
.arc-mcell.wrong{background:rgba(239,68,68,.55);border-color:#ef4444}

.arc-chain{margin:4px auto 14px;max-width:420px;text-align:left}
.arc-step{display:flex;align-items:flex-start;gap:9px;background:rgba(255,255,255,.06);border-radius:10px;padding:9px 12px;font-size:.86rem;line-height:1.4}
.arc-step span{flex-shrink:0;width:19px;height:19px;border-radius:50%;background:var(--green,#10b981);color:#04221a;font-size:.68rem;font-weight:700;display:flex;align-items:center;justify-content:center;margin-top:1px}
.arc-arrow{text-align:center;font-size:.85rem;opacity:.4;line-height:1.6}

/* Subject Rush picker */
.arc-subjects{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:14px}
.arc-subject{padding:13px 12px;border-radius:12px;background:rgba(255,255,255,.07);
  border:1.5px solid rgba(255,255,255,.12);color:#fff;font-size:.88rem;font-weight:600;transition:.14s}
.arc-subject:hover{border-color:var(--green,#10b981);background:rgba(16,185,129,.16)}

/* Map Master uses word-length cells, not square ones */
.arc-grid.wide{grid-template-columns:repeat(3,1fr)}
.arc-cell.text{aspect-ratio:auto;padding:14px 8px;font-size:.84rem;font-weight:600;line-height:1.3}

/* Time Machine — ordering list */
.arc-order{display:flex;flex-direction:column;gap:9px;margin-top:14px}
.arc-opt.block{width:100%}
.arc-seq{flex-shrink:0;width:21px;height:21px;border-radius:50%;background:rgba(255,255,255,.14);
  font-size:.7rem;display:flex;align-items:center;justify-content:center;opacity:.9}
.arc-opt.right .arc-seq{background:#10b981;color:#04221a;font-weight:700;opacity:1}

.arc-loading{text-align:center;opacity:.7;font-size:.9rem;padding:32px 10px;line-height:1.6}

.arc-end{text-align:center}
.arc-final{font-family:'Space Grotesk',sans-serif;font-size:3.6rem;font-weight:700;color:var(--green,#10b981);line-height:1}
.arc-sub{font-size:.84rem;opacity:.7;margin-top:6px}
.arc-reward{margin-top:16px;font-size:.88rem;background:rgba(255,255,255,.06);border-radius:12px;padding:12px 14px;line-height:1.65}
.arc-best{color:#fcd34d;font-weight:700}
.arc-endbtns{display:flex;gap:9px;justify-content:center;flex-wrap:wrap;margin-top:18px}
.arc-board{width:100%;margin-top:16px;border-collapse:collapse;font-size:.84rem}
.arc-board th{text-align:left;opacity:.5;font-size:.68rem;text-transform:uppercase;letter-spacing:.06em;padding:6px 9px}
.arc-board td{padding:7px 9px;border-top:1px solid rgba(255,255,255,.08)}
.arc-board td:last-child{text-align:right;font-weight:700}

@media(max-width:560px){
  #arcadeOverlay{padding:0}
  .arc-shell{max-height:100vh;height:100%;border-radius:0;border:none}
  .arc-prompt{font-size:1.4rem}
  .arc-opts{grid-template-columns:1fr}
  .arc-subjects{grid-template-columns:1fr 1fr}
  .arc-grid.wide{grid-template-columns:repeat(2,1fr)}
  .arc-final{font-size:3rem}
}