@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Inter:wght@400;600&display=swap');

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

:root {
  --main-bg-color: #05080f;
  --section-bg-color: rgba(10,40,80,0.95);
  --golden-yellow: #feac32;
}

body {
  background: radial-gradient(ellipse at center, #0a1428, #05080f);
  font-family: 'Orbitron', 'Inter', sans-serif;
  min-height: 100vh;
  overflow: hidden;
}

.start-screen {
  background: rgba(5,20,40,0.95);
  border: 1px solid rgba(0,212,255,0.3);
  color: #e0f4ff;
  width: 100%;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-right: -50%;
  transform: translate(-50%, -50%);
  border-radius: 20px;
  padding: 24px;
  padding-bottom: 12px;
  backdrop-filter: blur(12px);
  box-shadow: 0 0 40px rgba(0,212,255,0.15);
}

.main-title {
  text-align: center;
  font-family: 'Orbitron', monospace;
  font-size: 1.6rem;
  font-weight: 900;
  color: #00d4ff;
  text-shadow: 0 0 20px rgba(0,212,255,0.6);
  letter-spacing: 2px;
  margin-bottom: 8px;
}

.instructions {
  text-align: center;
  font-size: 0.85rem;
  margin: 14px;
  line-height: 1.8rem;
  color: rgba(224,244,255,0.7);
  font-family: 'Inter', sans-serif;
}

.btn {
  cursor: pointer;
  min-width: 100px;
  padding: 10px 20px;
  margin: 10px;
  color: #0a0e1a;
  font-size: 0.85rem;
  font-family: 'Orbitron', monospace;
  font-weight: 700;
  letter-spacing: 1px;
  background: linear-gradient(135deg, #fecc4c, #ffac33);
  border: none;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(254,172,50,0.4);
  transition: all 0.2s;
}

.btn:hover {
  background-image: linear-gradient(#ffcc4c, #f89808);
}

.btn-container {
  display: flex;
  align-items: center;
  justify-content: center;
}

.checkpoint-screen {
  position: absolute;
  left: 0;
  right: 0;
  margin-left: auto;
  margin-right: auto;
  width: 100%;
  text-align: center;
  background-color: var(--section-bg-color);
  border-radius: 20px;
  padding: 10px;
  display: none;
}

#canvas {
  display: none;
}

@media (min-width: 768px) {
  .start-screen {
    width: 60%;
    max-width: 700px;
  }

  .checkpoint-screen {
    max-width: 300px;
  }
}