html {
  box-sizing: border-box;
  font-size: 16px;
}
*, *:before, *:after {
  box-sizing: inherit;
}

body {
  background: #e1f5fe;
  font-family: Arial, sans-serif;
  text-align: center;
  color: #222;
  margin: 0;
  min-height: 100vh;
}

/* Encabezado */
h1 {
  margin-top: 2rem;
  color: #01579b;
  font-size: clamp(1.3rem, 5vw, 2.5rem);
}

/* Panel de botones Simon */
#game-container {
  margin: 2.2rem auto 1rem auto;
  width: 100%;
  max-width: 340px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 1.2em;
  justify-content: center;
  align-items: center;
  padding: 0.8em;
  border-radius: 1.2em;
  background: #ffffffdd;
  box-shadow: 0 2px 14px #bbbe;
  aspect-ratio: 1 / 1; /* el panel siempre es cuadrado */
}

/* Botón Simon */
.color-btn {
  width: 100%;
  height: 100%;
  border-radius: 1.1em;
  box-shadow: 0 2px 8px #bbb;
  cursor: pointer;
  transition: filter 0.2s, border 0.2s;
  filter: brightness(0.85);
  border: 3px solid #fafafa;
  min-width: 0;
  min-height: 0;
  aspect-ratio: 1 / 1;
  /* background colors asignados por id */
}
#green   { background: #43a047;}
#red     { background: #e53935;}
#yellow  { background: #fbc02d;}
#blue    { background: #1e88e5;}
.color-btn.active {
  filter: brightness(1.1);
  border: 3px solid #333;
}

/* Estado y botón inicio */
#status {
  font-size: clamp(1em, 2vw, 1.15em);
  min-height: 2em;
  margin-bottom: 1em;
  color: #01579b;
}

#start-btn {
  background: #01579b;
  color: #fff;
  font-size: clamp(1em, 2vw, 1.13em);
  border: none;
  border-radius: 0.6em;
  padding: 0.5em 2em;
  cursor: pointer;
  transition: background 0.2s;
  box-shadow: 0 2px 8px #01579b33;
  margin-bottom: 1.4em;
}
#start-btn:hover,
#start-btn:active {
  background: #263238;
}

/* ==== Pantallas pequeñas/móviles ==== */
@media (max-width: 600px) {
  h1 {
    margin-top: 6vw;
    font-size: clamp(1.1em, 7vw, 2em);
  }
  #game-container {
    max-width: 96vw;
    gap: 6vw;
    border-radius: 6vw;
    padding: 2vw;
  }
  .color-btn {
    border-radius: 5vw;
    box-shadow: 0 2px 6px #bbb;
  }
  #start-btn {
    font-size: clamp(1em, 8vw, 1.4em);
    padding: 1em 13vw;
    border-radius: 5vw;
    margin-bottom: 6vw;
  }
  #status {
    font-size: clamp(1em, 7vw, 1.3em);
    margin-bottom: 5vw;
  }
}

/* ==== Pantallas muy pequeñas ==== */
@media (max-width: 350px) {
  #game-container {
    max-width: 93vw;
    gap: 3vw;
    padding: 1vw;
    border-radius: 10vw;
  }
  .color-btn {
    border-radius: 8vw;
  }
  #start-btn {
    padding: 0.8em 3vw;
    border-radius: 8vw;
    font-size: clamp(0.9em, 13vw, 1.1em);
  }
}