:root {
  --c64-blue: #352879;
  --c64-lblue: #6c5eb5;
  --c64-green: #9ad284;
}
html, body {
  margin: 0; height: 100%;
  background: #000; color: var(--c64-lblue);
  overflow: hidden;
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
}
#stage {
  position: absolute; left: 50%; top: 50%;
  transform: translate(-50%, -50%);
}
#screen {
  display: block; width: 100%; height: 100%;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}
#crt { position: absolute; inset: 0; pointer-events: none; display: none; }

/* Efecto monitor CRT: líneas de barrido, viñeta y un poco de brillo */
body.crt #screen { filter: saturate(1.25) contrast(1.08) brightness(1.12) blur(0.4px); }
body.crt #crt {
  display: block;
  background:
    radial-gradient(ellipse at center, transparent 58%, rgba(0, 0, 0, .6) 100%),
    linear-gradient(rgba(0, 0, 0, .28) 50%, transparent 50%) 0 0 / 100% calc(100% / 272);
  border-radius: 1.5% / 2%;
  box-shadow: inset 0 0 40px rgba(0, 0, 0, .7);
}

/* Pantalla de inicio */
#start {
  position: fixed; inset: 0;
  display: grid; place-items: center;
  background: radial-gradient(circle at center, #15103a 0%, #000 75%);
  z-index: 10; transition: opacity .6s;
}
#start.hidden { opacity: 0; pointer-events: none; }
#start .box {
  background: var(--c64-blue);
  border: 28px solid var(--c64-lblue);
  padding: 24px 32px; max-width: min(560px, calc(100vw - 100px));
  text-align: center; text-transform: uppercase;
  box-shadow: 0 0 80px rgba(108, 94, 181, .35);
}
#start h1 { margin: 6px 0 10px; font-size: clamp(26px, 6vw, 44px); letter-spacing: .12em; color: #fff; }
#start .sub { text-transform: none; color: #c8c2ff; line-height: 1.5; }
#start .dim { opacity: .75; font-size: 13px; letter-spacing: .1em; }
#start button {
  margin: 14px 0 4px; padding: 12px 22px;
  font: inherit; font-size: 18px; letter-spacing: .08em;
  color: var(--c64-blue); background: var(--c64-lblue);
  border: 0; cursor: pointer;
}
#start button:hover, #start button:focus-visible { background: #fff; outline: none; }
#start table { margin: 14px auto 0; font-size: 13px; text-transform: none; border-spacing: 10px 3px; text-align: left; }
#start td:first-child { color: #fff; }

#osd {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  padding: 6px 14px; background: rgba(53, 40, 121, .9); color: #fff;
  font-size: 14px; letter-spacing: .1em;
  opacity: 0; transition: opacity .3s; pointer-events: none; z-index: 20;
}
#osd.show { opacity: 1; }