:root {
  --bg: #0f1220;
  --card: #161a2e;
  --muted: #8a93b2;
  --text: #e6e9f5;
  --accent: #8ef0ff;
  --accent-2: #b084ff;
  --danger: #ff5d8f;
  --success: #7cf7b4;
  --warning: #ffd369;
  --grid: rgba(255,255,255,0.06);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 800px at 70% -10%, #1e2240, transparent), radial-gradient(1200px 800px at -10% 120%, #221e40, transparent), var(--bg);
}

.mono { font-family: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace; }

#app { max-width: 1100px; margin: 0 auto; padding: 24px; }

.app-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.brand { display: flex; align-items: center; gap: 14px; }
.logo { width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center; background: linear-gradient(135deg, var(--accent-2), #2b88ff); color: #0b0f1a; font-weight: 800; font-size: 22px; box-shadow: 0 10px 30px rgba(176,132,255,0.3); }
.title h1 { margin: 0; font-size: 24px; letter-spacing: 0.4px; }
.subtitle { margin: 2px 0 0; color: var(--muted); font-size: 13px; }

.game-meta { display: flex; align-items: center; gap: 8px; }
.badge { background: #1f2342; color: var(--muted); padding: 6px 10px; border-radius: 999px; border: 1px solid #2a2f57; font-size: 12px; }
.badge.accent { color: var(--accent); border-color: #4066ff; }
.timer { width: 56px; text-align: center; font-weight: 700; color: #0b0f1a; background: linear-gradient(135deg, var(--warning), #ffbd59); border: none; box-shadow: 0 10px 30px rgba(255, 211, 105, 0.25); }
@keyframes pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.1); } }
.hidden { display: none !important; }

.content { display: grid; grid-template-columns: 1fr; gap: 18px; }
.card { background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.06); border-radius: 16px; padding: 18px; box-shadow: 0 6px 30px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.06); backdrop-filter: blur(8px); }

.form-row { display: grid; grid-template-columns: 200px 1fr 60px; align-items: center; gap: 10px; margin: 10px 0; }
label { color: var(--muted); font-size: 14px; }
input[type="number"], input[type="text"] { width: 100%; padding: 10px 12px; border-radius: 12px; border: 1px solid #2a2f57; background: #0d1021; color: var(--text); }
input[type="range"] { width: 100%; }
.range-value { color: var(--accent); font-weight: 700; }

.players-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; margin: 10px 0 4px; }
.player-card { background: #11142a; border: 1px solid #262b4a; border-radius: 12px; padding: 10px; display: grid; gap: 4px; }
.player-card .row { display: flex; align-items: center; gap: 8px; }
.color-dot { width: 16px; height: 16px; border-radius: 999px; border: 2px solid rgba(255,255,255,0.6); }

.topics { margin-top: 8px; border: 1px dashed #2a2f57; border-radius: 12px; padding: 10px; }
.topics legend { color: var(--muted); }
.topics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 8px; margin-top: 8px; }
.hint { color: var(--muted); font-size: 12px; margin-top: 8px; }

.actions { margin-top: 12px; display: flex; gap: 8px; }
.btn { border: 1px solid #2a2f57; color: var(--text); background: #0d1021; padding: 10px 14px; border-radius: 12px; cursor: pointer; }
.btn.primary { background: linear-gradient(135deg, #6e98ff, #8e79ff); border: none; color: white; box-shadow: 0 10px 30px rgba(110,152,255,0.25); }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.track-container { display: grid; gap: 12px; }
.lane { display: grid; grid-template-columns: 180px 1fr; gap: 8px; align-items: center; }
.lane .name { display: flex; align-items: center; gap: 8px; }
.lane .name .car { 
  width: 36px; 
  height: 24px; 
  border-radius: 8px; 
  display: grid; 
  place-items: center; 
  color: #0b0f1a; 
  font-weight: 800; 
  font-size: 16px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.2);
  border: 2px solid rgba(255,255,255,0.3);
  position: relative;
  overflow: hidden;
}

.lane .name .car::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  right: 2px;
  height: 6px;
  background: rgba(255,255,255,0.3);
  border-radius: 3px;
}

.setup-car {
  width: 24px; 
  height: 16px; 
  border-radius: 6px; 
  display: grid; 
  place-items: center; 
  color: #0b0f1a; 
  font-weight: 800; 
  font-size: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.3);
  position: relative;
  overflow: hidden;
}

.setup-car::before {
  content: '';
  position: absolute;
  top: 1px;
  left: 1px;
  right: 1px;
  height: 4px;
  background: rgba(255,255,255,0.3);
  border-radius: 2px;
}
.progress { display: grid; grid-template-columns: repeat(10, 1fr); gap: 6px; }
.cell { height: 24px; border-radius: 6px; background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.08); position: relative; overflow: hidden; }
.cell.filled::after { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, var(--accent), #2b88ff); opacity: 0.8; }

.arena-header { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.status-row { display: flex; gap: 8px; flex-wrap: wrap; }
.equation { font-family: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace; font-size: 18px; line-height: 2; padding: 16px; background: #0d1021; border: 1px solid #2a2f57; border-radius: 12px; min-height: 72px; overflow-x: auto; overflow-wrap: anywhere; }
.equation .blank { display: inline-block; min-width: 24px; padding: 0 6px; border-bottom: 3px solid #3a3f6d; margin: 0 2px; cursor: pointer; }
.equation .blank.revealed { border-bottom-color: #2b8855; color: var(--success); }
.equation .blank.locked { cursor: not-allowed; opacity: 0.6; }
.equation .blank-input { display: inline-flex; align-items: center; gap: 8px; vertical-align: middle; }
.equation .blank-input .preview { min-width: 44px; color: var(--muted); }

.instructions { color: var(--muted); margin: 8px 0; }
.controls { display: flex; flex-wrap: wrap; gap: 8px; }

.input-inline { width: 120px; padding: 8px 10px; border-radius: 10px; border: 1px solid #2a2f57; background: #0d1021; color: var(--text); }
.blank-input.error .input-inline { border-color: var(--danger); box-shadow: 0 0 0 2px rgba(255,93,143,0.2); }

.toast { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); background: #12152a; border: 1px solid #2a2f57; padding: 10px 12px; border-radius: 12px; color: var(--text); box-shadow: 0 10px 30px rgba(0,0,0,0.4); }

/* Winner banner */
.winner-banner {
  width: 100%;
  text-align: center;
  font-size: 28px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #ffffff;
  background: linear-gradient(135deg, #6e98ff, #8e79ff);
  padding: 18px;
  border-radius: 14px;
  box-shadow: 0 12px 36px rgba(110,152,255,0.35);
}

.explain {
  margin-top: 10px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 10px 12px;
  color: var(--text);
}
.explain .title { font-weight: 700; margin-bottom: 6px; }
.explain .why { color: var(--muted); font-size: 13px; }
.explain .countdown { color: var(--accent); font-weight: 700; margin-top: 6px; }

.app-footer { margin-top: 16px; color: var(--muted); font-size: 12px; display: flex; align-items: center; justify-content: center; opacity: 0.9; }

@media (min-width: 900px) {
  .content { grid-template-columns: 1.1fr 1fr; }
}


/* Floating language toggle */
.lang-toggle {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 1000;
  border: 1px solid #2a2f57;
  color: var(--text);
  background: linear-gradient(135deg, #6e98ff, #8e79ff);
  padding: 10px 12px;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 10px 30px rgba(110,152,255,0.25);
  font-weight: 700;
}