:root { color-scheme: dark; }
* { box-sizing: border-box; touch-action: manipulation; }
html, body {
  margin: 0; padding: 0; height: 100dvh; overflow: hidden;
  background: #0a0a0a; color: #f5f5f5;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: transparent;
  user-select: none; -webkit-user-select: none; overscroll-behavior: none;
}
main {
  height: 100%; max-width: 480px; margin: 0 auto; display: flex; flex-direction: column;
  padding: max(60px, env(safe-area-inset-top)) 16px max(20px, env(safe-area-inset-bottom)); gap: 16px;
}
.score-bar { display: flex; gap: 8px; align-items: stretch; }
.score-box { flex: 1; background: #161616; border: 1px solid #2a2a2a; border-radius: 12px; padding: 8px 12px; text-align: center; min-width: 0; }
.score-label { display: block; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: #a0a0a0; }
.moves-val, .best-val { display: block; font-size: 22px; font-weight: 800; font-variant-numeric: tabular-nums; letter-spacing: -0.02em; color: #f5f5f5; margin-top: 2px; line-height: 1.1; }
.new-btn { flex: 0 0 auto; font: inherit; color: #fff; background: #4f9eff; border: none; border-radius: 12px; padding: 0 18px; min-height: 56px; cursor: pointer; font-weight: 700; font-size: 14px; -webkit-tap-highlight-color: transparent; }
.new-btn:active { background: #3d8ae8; }

#game { flex: 1; display: flex; align-items: center; justify-content: center; min-height: 0; }
.kl-board { position: relative; background: #11151c; border: 3px solid #2a3142; border-radius: 8px; touch-action: none;
  /* bottom exit gap hint */
  box-shadow: 0 4px 0 -2px #11151c; }
.kl-goal { position: absolute; border: 2px dashed rgba(255,255,255,0.18); border-radius: 8px; box-sizing: border-box; }
.kl-piece {
  position: absolute; border-radius: 8px; cursor: grab;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.12), 0 2px 4px rgba(0,0,0,0.35);
  transition: left 0.08s ease, top 0.08s ease;
}
.kl-piece:active { cursor: grabbing; }
.kl-piece.cc { background: linear-gradient(160deg,#ff7a7a,#e23b3b); box-shadow: inset 0 0 0 1px rgba(255,255,255,0.25), 0 2px 6px rgba(0,0,0,0.4); }
.kl-piece.v { background: linear-gradient(160deg,#6db0ff,#3d7fe0); }
.kl-piece.h { background: linear-gradient(160deg,#5ad6c4,#2fa593); }
.kl-piece.s { background: linear-gradient(160deg,#cdb4ff,#9a78e0); }

.overlay-sub { margin: -4px 0 4px; font-size: 14px; font-weight: 600; color: #a0a0a0; }
.overlay-howto { margin: 0 0 4px; font-size: 13px; line-height: 1.45; color: #b8b8b8; }
.overlay-card .start-btn { background: #4f9eff; border-color: #4f9eff; }

.home-link, .hof-link {
  position: fixed; top: max(12px, env(safe-area-inset-top)); z-index: 10;
  width: 40px; height: 40px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px; background: rgba(0, 0, 0, 0.35); color: #fff; text-decoration: none;
  font-size: 20px; font-weight: 600; line-height: 1; -webkit-tap-highlight-color: transparent;
  touch-action: manipulation; backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
  transition: background 0.15s ease; border: none; cursor: pointer; font-family: inherit;
}
.home-link { left: max(12px, env(safe-area-inset-left)); }
.hof-link { right: max(12px, env(safe-area-inset-right)); }
@media (hover: hover) { .home-link:hover, .hof-link:hover { background: rgba(0, 0, 0, 0.55); } }

.overlay { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.55); display: flex; align-items: center; justify-content: center; z-index: 20; padding: 20px; backdrop-filter: blur(2px); -webkit-backdrop-filter: blur(2px); }
.overlay[hidden] { display: none; }
.overlay-card { background: #161616; border: 1px solid #2a2a2a; border-radius: 18px; padding: 24px 22px; display: flex; flex-direction: column; gap: 12px; align-items: center; text-align: center; min-width: 240px; max-width: 320px; width: 100%; }
.overlay-card h2 { margin: 0; font-size: 22px; font-weight: 800; letter-spacing: -0.02em; }
.overlay-score { margin: 0; font-size: 56px; font-weight: 800; font-variant-numeric: tabular-nums; letter-spacing: -0.04em; line-height: 1; }
.overlay-card button { font: inherit; color: #fff; background: rgba(255, 255, 255, 0.10); border: 1px solid rgba(255, 255, 255, 0.22); border-radius: 999px; padding: 12px 20px; min-height: 44px; cursor: pointer; font-weight: 600; font-size: 14px; width: 100%; -webkit-tap-highlight-color: transparent; }
.overlay-card button:active { background: rgba(255, 255, 255, 0.18); }
.overlay-card .save-btn { background: #4f9eff; border-color: #4f9eff; }
.overlay-card .save-btn:active { background: #3d8ae8; }