:root {
  --bg-top: #f4f8f5;
  --bg-bottom: #dbe8df;
  --panel: #ffffffcc;
  --panel-border: #2d6a4f33;
  --ink: #1a2b24;
  --brand: #1b5e20;
  --brand-strong: #124017;
  --accent: #f4a300;
  --court: #eaf2ec;
  --court-line: #9bb4a0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 100% 0%, #ffffff66, transparent 65%),
    linear-gradient(165deg, var(--bg-top), var(--bg-bottom));
}

.app {
  width: min(980px, 100vw);
  margin: 0 auto;
  padding: 14px;
}

.hud {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  padding: 10px 14px;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: var(--panel);
  backdrop-filter: blur(3px);
}

.brand {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--brand-strong);
}

.stage-wrap {
  position: relative;
  width: min(100%, 560px);
  margin: 0 auto;
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  background: linear-gradient(#f6fbf7, #e4f0e7);
  overflow: hidden;
  box-shadow: 0 12px 28px #0a120e1a;
}

#game {
  width: 100%;
  display: block;
  touch-action: none;
  background: transparent;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 10px;
  text-align: center;
  padding: 20px;
  background: linear-gradient(#f8fff9de, #e8f4ebde);
}

.overlay.hidden {
  display: none;
}

.overlay h1 {
  margin: 0;
  color: var(--brand-strong);
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.overlay p {
  margin: 0 auto;
  max-width: 44ch;
  line-height: 1.4;
}

button {
  justify-self: center;
  border: 0;
  border-radius: 10px;
  padding: 11px 16px;
  font: inherit;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(180deg, var(--brand), #154b1b);
  cursor: pointer;
  transition: transform 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
}

@media (max-width: 720px) {
  .app {
    padding: 8px;
  }

  .hud {
    flex-direction: column;
  }
}