* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: #0a0a1a;
  overflow: hidden;
  font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  color: #fff;
  user-select: none;
  -webkit-user-select: none;
}

#game-container {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

#gameCanvas {
  display: block;
  width: 100%;
  height: 100%;
  background: #0a0a2e;
}

/* Overlays */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5, 5, 20, 0.85);
  backdrop-filter: blur(6px);
  z-index: 10;
  animation: fadeIn 0.3s ease;
}

.overlay.hidden { display: none; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.overlay-box {
  text-align: center;
  padding: 40px 50px;
  background: rgba(15, 15, 40, 0.9);
  border: 2px solid rgba(80, 160, 255, 0.3);
  border-radius: 20px;
  box-shadow: 0 0 40px rgba(40, 100, 255, 0.15);
  max-width: 440px;
  width: 90%;
}

.overlay-box.wide { max-width: 520px; }

.title-glow {
  font-size: 2.4em;
  font-weight: 900;
  letter-spacing: 2px;
  background: linear-gradient(135deg, #00d4ff, #7b2fff, #ff2d95);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  margin-bottom: 12px;
  filter: drop-shadow(0 0 12px rgba(80, 120, 255, 0.4));
}

.gameover-title {
  font-size: 2em;
  background: linear-gradient(135deg, #ff4444, #ff8800);
  -webkit-background-clip: text;
  background-clip: text;
}

.subtitle {
  font-size: 1em;
  color: #8899bb;
  margin-bottom: 20px;
}

.controls-hint {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
  font-size: 0.82em;
  color: #667799;
}

.controls-hint span {
  background: rgba(255,255,255,0.05);
  padding: 4px 10px;
  border-radius: 8px;
}

/* Buttons */
.btn {
  display: block;
  width: 100%;
  padding: 14px 0;
  margin: 8px 0;
  font-size: 1.1em;
  font-weight: 700;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  letter-spacing: 1px;
}

.btn:active { transform: scale(0.97); }

.btn-play {
  background: linear-gradient(135deg, #00c6ff, #0072ff);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 114, 255, 0.3);
}
.btn-play:hover { box-shadow: 0 4px 28px rgba(0, 114, 255, 0.5); }

.btn-records {
  background: rgba(255, 255, 255, 0.07);
  color: #8899bb;
  border: 1px solid rgba(255,255,255,0.1);
}
.btn-records:hover { background: rgba(255,255,255,0.12); color: #aabbdd; }
.btn-records.small { font-size: 0.85em; padding: 10px 0; }

.btn-submit {
  background: linear-gradient(135deg, #00e676, #00c853);
  color: #0a1a0a;
  box-shadow: 0 4px 20px rgba(0, 200, 83, 0.3);
}

.btn-retry {
  background: linear-gradient(135deg, #ff6d00, #ff3d00);
  color: #fff;
  box-shadow: 0 4px 20px rgba(255, 61, 0, 0.3);
}

.btn-back {
  background: rgba(255,255,255,0.07);
  color: #8899bb;
  border: 1px solid rgba(255,255,255,0.1);
}
.btn-back:hover { background: rgba(255,255,255,0.12); }

.btn-row { display: flex; gap: 8px; }
.btn-row .btn { flex: 1; }

/* Score */
.score-label { font-size: 0.85em; color: #667799; margin-top: 8px; }
.final-score {
  font-size: 3.2em;
  font-weight: 900;
  background: linear-gradient(135deg, #ffd700, #ff8800);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 4px 0 16px;
}

.rank-info {
  font-size: 0.9em;
  color: #00e676;
  margin-bottom: 8px;
  animation: popIn 0.3s ease;
}
.rank-info.hidden { display: none; }

@keyframes popIn {
  0% { transform: scale(0.5); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.name-input {
  width: 100%;
  padding: 12px 16px;
  font-size: 1em;
  background: rgba(255,255,255,0.08);
  border: 2px solid rgba(80, 160, 255, 0.3);
  border-radius: 10px;
  color: #fff;
  outline: none;
  margin-bottom: 12px;
  text-align: center;
  letter-spacing: 1px;
}
.name-input:focus { border-color: rgba(80, 160, 255, 0.7); }
.name-input::placeholder { color: #445566; }

/* HUD */
#hud {
  position: absolute;
  top: 0; left: 0; right: 0;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
  z-index: 5;
  pointer-events: none;
}
#hud.hidden { display: none; }

#hud-score {
  font-size: 1.6em;
  font-weight: 900;
  background: linear-gradient(135deg, #ffd700, #ff8800);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#hud-height, #hud-speed {
  font-size: 0.85em;
  color: rgba(255,255,255,0.5);
}

.wave-warning {
  position: absolute;
  top: 50px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255, 50, 50, 0.9);
  color: #fff;
  padding: 8px 24px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.95em;
  animation: pulse 0.5s ease infinite alternate;
  z-index: 6;
}
.wave-warning.hidden { display: none; }

@keyframes pulse { from { opacity: 0.7; transform: translateX(-50%) scale(0.95); } to { opacity: 1; transform: translateX(-50%) scale(1.05); } }

/* Leaderboard table */
#leaderboard-table {
  margin: 16px 0;
}

.lb-row {
  display: flex;
  align-items: center;
  padding: 10px 16px;
  margin: 4px 0;
  border-radius: 10px;
  background: rgba(255,255,255,0.04);
  transition: all 0.3s ease;
  animation: slideIn 0.4s ease backwards;
}

.lb-row:nth-child(1) { background: rgba(255, 215, 0, 0.12); }
.lb-row:nth-child(2) { background: rgba(192, 192, 192, 0.1); }
.lb-row:nth-child(3) { background: rgba(205, 127, 50, 0.1); }

.lb-row.me {
  background: rgba(0, 200, 83, 0.15) !important;
  border: 1px solid rgba(0, 200, 83, 0.3);
}

.lb-row.flash {
  animation: flashRow 0.6s ease;
}

@keyframes flashRow {
  0% { background: rgba(0, 200, 83, 0.4); transform: scale(1.02); }
  100% { background: rgba(0, 200, 83, 0.15); transform: scale(1); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

.lb-rank {
  width: 36px;
  font-weight: 900;
  font-size: 1.1em;
  color: #667;
}
.lb-row:nth-child(1) .lb-rank { color: #ffd700; }
.lb-row:nth-child(2) .lb-rank { color: #c0c0c0; }
.lb-row:nth-child(3) .lb-rank { color: #cd7f32; }

.lb-name {
  flex: 1;
  text-align: left;
  font-weight: 600;
  font-size: 0.95em;
  color: #cdd;
}

.lb-score {
  font-weight: 800;
  font-size: 1.05em;
  color: #00d4ff;
}

.lb-empty {
  padding: 24px;
  color: #556;
  font-style: italic;
}