:root {
  --bg: #0f172a;         /* slate-900 */
  --fg: #e5e7eb;         /* slate-200 */
  --tile: #4338ca;       /* indigo-700 */
  --tile-hover: #4f46e5; /* indigo-600 */
  --correct: #059669;    /* emerald-600 */
  --panel: #1e293b;      /* slate-800 */
  --panel-2: #334155;    /* slate-700 */
  --panel-3: #475569;    /* slate-600 */
  --rose: #fb7185;       /* rose-400 */
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  min-height: 100%;
}

.wrap { max-width: 1100px; margin: 0 auto; padding: 24px 16px 48px; }

header { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
h1 { margin: 0; font-size: clamp(22px, 2vw + 12px, 34px); letter-spacing: .5px; }
.stats { opacity: .9; font-weight: 600; }

.grid {
  display: grid;
  grid-template-columns: repeat(10, minmax(60px, 1fr));
  gap: 10px;
  margin-top: 20px;
}

.tile {
  background: var(--tile);
  border: 1px solid rgba(0,0,0,.2);
  border-radius: 14px;
  min-height: 60px;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: clamp(16px, 2vw + 6px, 24px);
  cursor: pointer;
  user-select: none;
  transition: transform .12s ease, background .12s ease, box-shadow .12s ease;
  box-shadow: 0 4px 10px rgba(0,0,0,.12);
  text-shadow: 0 1px 0 rgba(0,0,0,.35);
}
.tile:hover { background: var(--tile-hover); transform: translateY(-1px); }
.tile.correct { background: var(--correct); border-color: rgba(0,0,0,.25); cursor: default; }

/* Modal */
#modal {
  position: fixed;
  inset: 0;
  display: none;               
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(2px);
  z-index: 9999;
  padding: 20px;
}
#modalContent {
  width: min(94vw, 640px);
  background: var(--panel);
  border: 1px solid #0b1220;
  border-radius: 16px;
  padding: 18px 18px 20px;
  box-shadow: 0 20px 40px rgba(0,0,0,.35);
}
.modalTop { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.modalTop h2 { margin: 0; font-size: 18px; }
.xbtn {
  background: transparent;
  border: none;
  color: #cbd5e1;
  font-size: 20px;
  cursor: pointer;
  padding: 4px 6px;
}

.question { margin: 12px 0 14px; font-size: 16px; line-height: 1.5; }
.choices { display: grid; grid-template-columns: 1fr; gap: 8px; margin-top: 6px; }
.choice {
  background: var(--panel-2);
  border: 1px solid var(--panel-3);
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  transition: background .12s ease, border-color .12s ease, transform .04s ease;
  font-weight: 600;
}
.choice:hover { background: var(--panel-3); }

.feedback { margin-top: 10px; font-weight: 700; }
.feedback.ok { color: #86efac; }  
.feedback.bad { color: var(--rose); }

@media (max-width: 800px) {
  .grid { grid-template-columns: repeat(5, minmax(60px, 1fr)); }
}