* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg0: #0b1026;
  --bg1: #161033;
  --cyan: #4be1ff;
  --violet: #b06bff;
  --pink: #ff6ec7;
  --mint: #59f0c4;
  --ink: #eaf2ff;
  --sub: #8a93c8;
}

html, body {
  height: 100%;
  background: radial-gradient(120% 90% at 50% -10%, #1c1b4a 0%, var(--bg1) 45%, var(--bg0) 100%);
  color: var(--ink);
  font-family: "Pretendard", "Apple SD Gothic Neo", system-ui, -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.topbar {
  position: fixed; top: 0; left: 0; right: 0; height: 46px; z-index: 30;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 16px;
  background: linear-gradient(180deg, rgba(11,16,38,.92), rgba(11,16,38,0));
  font-size: 13px; letter-spacing: .3px;
}
.topbar .back { color: var(--cyan); text-decoration: none; opacity: .92; font-weight: 600; }
.topbar .back:hover { opacity: 1; text-shadow: 0 0 12px rgba(75,225,255,.6); }
.topbar .brand { color: var(--ink); opacity: .9; font-size: 13px; font-weight: 700; letter-spacing: .2px; }
.topbar .hs { color: var(--mint); font-size: 12px; font-weight: 600; }
.topbar .hs b { color: #fff; }

#stage {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
}

canvas#game {
  display: block;
  width: 100%; height: 100%;
  touch-action: none;
  cursor: pointer;
}

.hint {
  position: fixed; bottom: 12px; left: 0; right: 0; text-align: center;
  font-size: 12px; color: var(--sub); z-index: 20; pointer-events: none;
  text-shadow: 0 1px 3px rgba(0,0,0,.6); transition: opacity 1s;
  padding: 0 16px;
}

@media (max-width: 640px) {
  .topbar .brand { display: none; }
  .hint { font-size: 11px; }
}