* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;

  color: #f5f5f5;
  background:
    linear-gradient(
      180deg,
      #17251c 0%,
      #0b100d 100%
    );

  font-family:
    "Microsoft YaHei",
    "Noto Sans SC",
    Arial,
    sans-serif;
}

.site-header {
  position: relative;
  padding: 1.5rem 1rem 1rem;
  text-align: center;
}

.cornerlogo {
  position: absolute;
  top: 1rem;
  left: 1rem;
  border-radius: 50px;
  background-color: rgb(255, 255, 255);
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
}

.cornerlogo a,
.cornerlogo img {
  display: block;
}

.cornerlogo img {
  width: clamp(56px, 12vw, 100px);
  height: auto;
}

.site-header h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.5rem);
}

.site-header p {
  margin: 0.5rem 0 0;
  color: #c8d3cb;
}

main {
  width: min(100% - 2rem, 1000px);
  margin: 0 auto 3rem;
}

#game-container {
  width: 100%;
  aspect-ratio: 16 / 9;

  overflow: hidden;

  border: 3px solid #687d6d;
  border-radius: 12px;

  background-color: #000000;

  box-shadow:
    0 18px 45px rgb(0 0 0 / 45%);
}

/*
  Phaser creates a canvas element dynamically.

  display: block removes the tiny inline-element gap that
  canvases otherwise sometimes receive.
*/
#game-container canvas {
  display: block;
}

.controls {
  width: min(100%, 420px);
  margin: 1.5rem auto 0;
  padding: 1rem 1.25rem;

  border: 1px solid #526358;
  border-radius: 10px;

  background-color: rgb(13 21 16 / 85%);
}

.controls h2 {
  margin: 0 0 0.75rem;
  text-align: center;
}

.control-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.6rem 1rem;
  align-items: center;
}

.control-grid span:nth-child(odd) {
  min-width: 2.25rem;
  padding: 0.25rem;

  border: 1px solid #8fa098;
  border-radius: 5px;

  background-color: #26342b;

  font-size: 1.25rem;
  font-weight: bold;
  text-align: center;
}