* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: radial-gradient(circle at top, #ffe390, #1d3a73 60%);
  color: #fff;
  min-height: 100vh;
  overflow: hidden;
}

#gameCanvas {
  display: block;
  width: 100vw;
  height: 100vh;
  background: transparent;
}

.ui-panel {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
  z-index: 5;
}

.scoreboard {
  display: flex;
  gap: 18px;
  font-size: 14px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.controls {
  display: flex;
  align-items: center;
  gap: 10px;
  pointer-events: all;
}

.controls button,
.card button {
  border: none;
  padding: 6px 18px;
  border-radius: 999px;
  font-size: 14px;
  cursor: pointer;
  background: linear-gradient(135deg, #fbbf24, #fb923c);
  color: #1f2937;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: transform 0.2s ease;
}

.controls button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.controls button:not(:disabled):hover {
  transform: scale(1.05);
}

.sound-toggle {
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.sound-toggle input {
  accent-color: #fbbf24;
}

.soon {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(20, 23, 32, 0.85);
  z-index: 10;
}

.card {
  background: rgba(2, 6, 23, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 18px;
  padding: 30px;
  max-width: 360px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.75);
}

.card h1 {
  margin-bottom: 12px;
  font-size: 32px;
}

.card p {
  margin: 8px 0;
  line-height: 1.4;
  font-size: 14px;
}

.card ul {
  text-align: left;
  padding-left: 18px;
  line-height: 1.5;
  margin-bottom: 20px;
  font-size: 13px;
}

.card button {
  width: 100%;
}

.hidden {
  display: none;
}