* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}

body {
  min-height: 100vh;
  background: radial-gradient(circle at top, #111, #000);
  color: white;
  overflow: hidden;
}

.overlay {
  position: fixed;
  inset: 0;
  background: url("https://images.unsplash.com/photo-1542751371-adc38448a05e?auto=format&fit=crop&w=1600&q=80")
    center/cover no-repeat;
  opacity: 0.18;
  filter: blur(2px);
}

.container {
  position: relative;
  z-index: 2;
  padding: 30px;
  max-width: 900px;
  margin: auto;
  text-align: center;
}

.top h1 {
  font-size: 3rem;
  letter-spacing: 2px;
  margin-bottom: 10px;
}

.tagline {
  font-size: 1.2rem;
  opacity: 0.8;
}

.timer {
  margin-top: 12px;
  padding: 10px;
  display: inline-block;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 12px;
  opacity: 0.9;
}

.card {
  margin-top: 30px;
  padding: 25px;
  border-radius: 18px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.2);
  backdrop-filter: blur(10px);
}

.card h2 {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.card p {
  opacity: 0.85;
  margin-bottom: 15px;
}

.hud {
  display: flex;
  justify-content: center;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 15px;
}

#startBtn {
  padding: 10px 18px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  background: #00ff99;
  font-weight: bold;
}

#startBtn:hover {
  background: #00cc77;
}

.game-area {
  width: 100%;
  height: 320px;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,0.2);
  position: relative;
  overflow: hidden;
  background: rgba(0,0,0,0.35);
}

.target {
  width: 55px;
  height: 55px;
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: linear-gradient(135deg, red, orange);
  box-shadow: 0 0 15px rgba(255,0,0,0.7);
  cursor: pointer;
  display: none;
}

.note {
  margin-top: 12px;
  font-size: 0.95rem;
  opacity: 0.85;
}

.footer {
  margin-top: 25px;
  opacity: 0.7;
  font-size: 0.9rem;
}