:root {
  /* --- STUDENT CUSTOMIZATION ZONE --- */
  --bg-sky-1: linear-gradient(to bottom, #0b0014, #2a0e36);
  --sun-color-1: linear-gradient(to top, #ff0055, #ffcc00);
  --grid-color-1: #00f3ff; 
  
  --bg-sky-2: linear-gradient(to bottom, #000000, #220000);
  --sun-color-2: linear-gradient(to top, #550000, #ff0000); 
  --grid-color-2: #ff0000;

  --font-main: 'Courier New', monospace;
  --accent-color: #00f3ff;
}

body {
  margin: 0; overflow: hidden; font-family: var(--font-main);
  background: #000; color: white;
  display: flex; justify-content: center; align-items: center; height: 100vh;
}

#sky-layer {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background: var(--bg-sky-1); z-index: -1; transition: background 2s ease; 
}

#celestial-body {
  position: absolute; top: 15%; left: 50%; transform: translateX(-50%);
  width: 200px; height: 200px; background: var(--sun-color-1);
  border-radius: 50%; box-shadow: 0 0 60px var(--accent-color);
  -webkit-mask-image: linear-gradient(to bottom, black 50%, transparent 50%, black 55%, transparent 55%, black 60%, transparent 60%, black 70%, transparent 70%, black 80%, transparent 80%, black 90%);
  mask-image: linear-gradient(to bottom, black 50%, transparent 50%, black 55%, transparent 55%, black 60%, transparent 60%, black 70%, transparent 70%, black 80%, transparent 80%, black 90%);
  transition: all 2s ease;
}

#game-wrapper {
  position: relative; width: 100%; max-width: 800px; height: 100%;
  border-left: 1px solid rgba(255,255,255,0.1); border-right: 1px solid rgba(255,255,255,0.1);
}
canvas { display: block; width: 100%; height: 100%; }

body.level-2 #sky-layer { background: var(--bg-sky-2); }
body.level-2 #celestial-body { background: var(--sun-color-2); box-shadow: 0 0 50px red; width: 150px; height: 150px; }
body.level-2 { --accent-color: #ff0000; }

#ui-layer { position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; }
.hud-top { display: flex; justify-content: space-between; padding: 20px; font-weight: bold; text-shadow: 0 0 10px var(--accent-color); color: var(--accent-color); }
.panel {
  pointer-events: auto; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.95); border: 2px solid var(--accent-color);
  padding: 40px; text-align: center; box-shadow: 0 0 30px var(--accent-color); min-width: 300px;
}

button {
  background: transparent; border: 2px solid var(--accent-color); color: var(--accent-color);
  padding: 15px; font-family: inherit; cursor: pointer; font-weight: bold; margin-top: 10px; transition: 0.2s; width: 100%;
}
button:hover { background: var(--accent-color); color: #000; }
input { background: #111; border: 1px solid var(--accent-color); color: white; padding: 10px; width: 90%; margin-bottom: 10px; font-family: inherit; }
.hidden { display: none !important; }

.scanlines {
  position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
  background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.1) 50%);
  background-size: 100% 4px; pointer-events: none; z-index: 10;
}
.glitch-text { font-size: 2.5rem; margin-bottom: 10px; color: #fff; text-shadow: 2px 2px var(--accent-color); }