* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  height: 100%;
  font-family: "Comic Sans MS", "Chalkboard SE", "Baloo 2", system-ui, sans-serif;
  background: radial-gradient(circle at 50% 0%, #ffe9c7, #f6cfa0 70%, #e8b183);
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}
.stage { display: flex; flex-direction: column; height: 100%; padding: 10px; gap: 8px; }
.topbar { display: flex; align-items: center; gap: 12px; padding: 2px 6px; }
.topbar h1 {
  flex: 1; text-align: center; font-size: 26px; color: #7a4a1e;
  text-shadow: 0 2px 0 #fff7e8; letter-spacing: 0.5px;
}
.round-btn, .home, .game-menu {
  width: 46px; height: 46px; border: none; border-radius: 50%;
  background: #fff3df; box-shadow: 0 3px 0 #d9b78e; font-size: 22px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; text-decoration: none; color: #7a4a1e; user-select: none;
}
.game-menu { width: auto; min-width: 88px; padding: 0 12px; border-radius: 16px; font-family: inherit; font-size: 15px; }
.round-btn:active, .home:active, .game-menu:active { transform: translateY(2px); box-shadow: 0 1px 0 #d9b78e; }
.canvas-wrap { position: relative; flex: 1; display: flex; align-items: center; justify-content: center; min-height: 0; }
canvas {
  width: 100%; height: 100%; max-width: 100%; max-height: 100%;
  border-radius: 22px; box-shadow: 0 10px 30px #0000002e;
  touch-action: none; cursor: crosshair; background: #fffdf6;
}
.how-btn {
  border: none; border-radius: 22px; background: #7cc98a; color: #123;
  font-family: inherit; font-weight: bold; font-size: 15px; padding: 8px 16px;
  box-shadow: 0 3px 0 #4f9e60; cursor: pointer; white-space: nowrap;
}
.how-btn:active { transform: translateY(2px); box-shadow: 0 1px 0 #4f9e60; }
.how-modal {
  position: fixed; inset: 0; z-index: 50; display: flex;
  align-items: center; justify-content: center; background: #000000cc; padding: 16px;
}
.how-modal[hidden] { display: none; }
.how-inner { width: min(96vw, 900px); display: flex; flex-direction: column; align-items: center; gap: 12px; }
.how-inner video { width: 100%; border-radius: 14px; box-shadow: 0 12px 40px #0008; background: #000; }
.how-close {
  border: none; border-radius: 22px; background: #fff3df; color: #7a4a1e;
  font-family: inherit; font-weight: bold; font-size: 17px; padding: 10px 24px;
  box-shadow: 0 3px 0 #d9b78e; cursor: pointer;
}
.how-close:active { transform: translateY(2px); box-shadow: 0 1px 0 #d9b78e; }
@media (max-width: 520px) { .how-btn { font-size: 13px; padding: 7px 11px; } .topbar h1 { font-size: 22px; } }