:root {
  color-scheme: light;
  font-family: "Avenir Next", Avenir, "Segoe UI", sans-serif;
  --page-top: #dff4ff;
  --page-bottom: #f5fff2;
  --ink: #163554;
  --accent: #ff8f3f;
  --accent-soft: rgba(255, 143, 63, 0.15);
  --frame: rgba(255, 255, 255, 0.72);
  --frame-stroke: rgba(15, 61, 94, 0.12);
  --shadow: rgba(17, 66, 96, 0.2);
}

* {
  box-sizing: border-box;
}

html,
body {
  overflow-x: hidden;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top, rgba(255, 255, 255, 0.9), transparent 42%),
    linear-gradient(180deg, var(--page-top), var(--page-bottom));
  color: var(--ink);
}

.app {
  width: min(1180px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 28px 0 36px;
}

.intro {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(22, 53, 84, 0.72);
}

h1 {
  margin: 0;
  font-size: clamp(2.7rem, 4.8vw, 4.3rem);
  line-height: 0.96;
}

.lede {
  max-width: 36rem;
  margin: 12px 0 0;
  font-size: 1rem;
  line-height: 1.55;
  color: rgba(22, 53, 84, 0.82);
}

.controls {
  display: grid;
  align-content: start;
  gap: 10px;
  min-width: min(100%, 360px);
  padding: 16px 18px;
  border: 1px solid var(--frame-stroke);
  border-radius: 20px;
  background: var(--frame);
  backdrop-filter: blur(14px);
  box-shadow: 0 22px 40px -32px var(--shadow);
  font-size: 0.95rem;
}

.controls strong {
  color: var(--accent);
}

.controls em {
  font-style: normal;
  color: rgba(22, 53, 84, 0.65);
}

.game-shell {
  overflow: hidden;
  border-radius: 30px;
  border: 1px solid var(--frame-stroke);
  background: rgba(255, 255, 255, 0.68);
  box-shadow:
    0 28px 50px -26px var(--shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

#game {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  background: #80d7ff;
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

@media (max-width: 720px) {
  .app {
    width: min(100vw - 18px, 1180px);
    padding-top: 18px;
    padding-bottom: 18px;
  }

  .controls {
    width: 100%;
  }
}