/* ハロウィンイベント(10/24〜11/2 または ?halloween)。arcade.cssの後に読み込み、html.halloween の時だけ効く */
html.halloween,
html.hw-palette {
  --bg: #0d0613;
  --bg-elevated: #1a0d26;
  --text: #fff1e0;
  --text-muted: #c9a9d8;
  --border: #4a2a63;
  --accent: #ff7a1a;
  --accent-soft: #3a1d12;
  --star: #ffb347;
  --ink: #6b3a8f;
  --cab-edge: #6b3a8f;
  --screen: #0a0410;
  --neon-pink: #ff7a1a;
  --neon-cyan: #7dff3a;
  --neon-yellow: #ffd24a;
  --neon-green: #b6ff5a;
  --marquee: linear-gradient(90deg, #ff7a1a, #8a2be2, #7dff3a, #ff7a1a);
  --shadow: 0 6px 22px rgba(255, 122, 26, 0.18);
}
html.halloween body,
html.hw-palette body {
  background:
    radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px) 0 0 / 18px 18px,
    radial-gradient(900px 480px at 50% -8%, rgba(255, 122, 26, 0.24), transparent 62%),
    radial-gradient(800px 460px at 100% 28%, rgba(138, 43, 226, 0.2), transparent 60%),
    var(--bg);
  background-attachment: fixed;
}
html.halloween .site-header,
html.hw-palette .site-header {
  background: linear-gradient(180deg, #2a1040, #12061c);
  box-shadow: 0 4px 26px rgba(255, 122, 26, 0.4);
}
html.halloween .icon-btn,
html.hw-palette .icon-btn { background: #24102f; }
html.halloween .logo-sub,
html.hw-palette .logo-sub { color: var(--neon-cyan); }
html.halloween .game-card::after,
html.hw-webs .game-card::after {
  content: "🕸️";
  position: absolute;
  right: 38px;
  bottom: 1px;
  font-size: 0.8rem;
  opacity: 0.4;
  pointer-events: none;
}

/* ===== バナー ===== */
.halloween-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  margin: 0 0 18px;
  padding: 12px 16px;
  background: linear-gradient(90deg, #2a1040, #3a1d12);
  border: 3px solid #6b3a8f;
  border-left: 8px solid #ff7a1a;
  border-radius: 12px;
  box-shadow: 0 0 22px rgba(255, 122, 26, 0.3);
  color: #fff1e0;
  font-size: 0.86rem;
}
.hw-title {
  font-family: var(--font-pixel);
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  color: #ffb347;
  text-shadow: 0 0 8px #ff7a1a, 0 0 18px #ff7a1a;
}
.hw-msg { flex: 1 1 220px; }
.hw-candy {
  font-family: var(--font-pixel);
  color: #b6ff5a;
  text-shadow: 0 0 6px rgba(182, 255, 90, 0.7);
  white-space: nowrap;
}
.halloween-banner button {
  border: 2px solid #6b3a8f;
  background: #1a0d26;
  color: #ffb347;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  cursor: pointer;
}
.halloween-banner button:hover { border-color: #ff7a1a; }

/* ===== ただよう霧 ===== */
.hw-fog {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 140px;
  z-index: 5;
  pointer-events: none;
  background: linear-gradient(to top, rgba(138, 43, 226, 0.28), transparent);
  animation: hwFog 9s ease-in-out infinite alternate;
}
@keyframes hwFog {
  from { opacity: 0.55; }
  to { opacity: 1; }
}

/* ===== 横切るおばけ ===== */
.hw-ghost {
  position: fixed;
  top: var(--y, 40vh);
  z-index: 120;
  padding: 4px;
  font-size: 2.4rem;
  line-height: 1;
  background: none;
  border: none;
  cursor: pointer;
  filter: drop-shadow(0 0 10px rgba(255, 122, 26, 0.8));
  animation: hwFly var(--dur, 9s) linear forwards, hwBob 1.2s ease-in-out infinite;
}
.hw-ghost.rtl { animation-name: hwFlyBack, hwBob; }
@keyframes hwFly {
  from { left: -70px; }
  to { left: calc(100vw + 20px); }
}
@keyframes hwFlyBack {
  from { left: calc(100vw + 20px); }
  to { left: -70px; }
}
@keyframes hwBob {
  0%, 100% { transform: translateY(0) rotate(-6deg); }
  50% { transform: translateY(-14px) rotate(6deg); }
}
.hw-pop {
  position: fixed;
  z-index: 121;
  pointer-events: none;
  font-family: var(--font-pixel);
  font-size: 1.1rem;
  color: #b6ff5a;
  text-shadow: 0 0 8px #7dff3a;
  animation: hwPop 1s ease-out forwards;
}
@keyframes hwPop {
  to { transform: translateY(-50px); opacity: 0; }
}

/* ===== イタズラ(TRICK) ===== */
.hw-trick-overlay {
  position: fixed;
  inset: 0;
  z-index: 250;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  pointer-events: none;
  background: rgba(5, 0, 10, 0.88);
  animation: hwFlash 1.4s steps(1) forwards;
}
.hw-trick-emoji { font-size: 6rem; }
.hw-trick-text {
  font-family: var(--font-pixel);
  font-size: 1.6rem;
  letter-spacing: 0.2em;
  color: #ff7a1a;
  text-shadow: 0 0 10px #ff7a1a;
}
@keyframes hwFlash {
  0% { opacity: 1; }
  15% { opacity: 0.2; }
  30% { opacity: 1; }
  45% { opacity: 0.4; }
  60% { opacity: 1; }
  100% { opacity: 0; }
}
.hw-shake .game-card { animation: hwShake 0.4s linear 3; }
@keyframes hwShake {
  0%, 100% { transform: translateX(0) rotate(0); }
  25% { transform: translateX(-4px) rotate(-1deg); }
  75% { transform: translateX(4px) rotate(1deg); }
}

@media (prefers-reduced-motion: reduce) {
  .hw-fog,
  .hw-shake .game-card { animation: none; }
  .hw-ghost { animation: none; left: var(--x, 40vw); }
  .hw-trick-overlay { animation: hwFade 1.4s ease forwards; }
  @keyframes hwFade { 0%, 60% { opacity: 1; } 100% { opacity: 0; } }
}

/* ===== お菓子ショップ ===== */
.cs-dialog { width: min(520px, 100%); max-height: min(82vh, 640px); display: flex; flex-direction: column; }
.cs-balance { margin: 0 0 8px; font-family: var(--font-pixel); color: var(--accent); }
.cs-balance b { font-size: 1.25rem; }
.cs-list { list-style: none; margin: 0; padding: 0 4px 0 0; overflow-y: auto; }
.cs-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.cs-emoji {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--screen);
  border: 2px solid var(--cab-edge);
  border-radius: 8px;
}
.cs-info { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.cs-info b { font-family: var(--font-pixel); font-weight: 400; letter-spacing: 0.03em; }
.cs-info small { color: var(--text-muted); font-size: 0.74rem; line-height: 1.4; }
.cs-btn {
  flex: 0 0 auto;
  min-width: 84px;
  padding: 7px 10px;
  font-family: var(--font-pixel);
  font-size: 0.82rem;
  color: #fff;
  background: var(--neon-pink);
  border: 2px solid var(--cab-edge);
  border-radius: 999px;
  cursor: pointer;
}
.cs-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.cs-btn.on { background: var(--neon-green); color: #112; }
.cs-btn.off { background: var(--screen); color: var(--text-muted); }
.cs-note { margin: 10px 0 0; color: var(--text-muted); font-size: 0.74rem; line-height: 1.5; }

/* ===== お菓子ショップで買えるもの ===== */
.hw-buddy {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 90;
  font-size: 1.6rem;
  pointer-events: none;
  filter: drop-shadow(0 0 8px rgba(255, 122, 26, 0.7));
}
@media (prefers-reduced-motion: reduce) {
  .hw-buddy { left: auto; right: 16px; top: auto; bottom: 16px; }
}
.hw-bat {
  position: fixed;
  top: var(--y, 30vh);
  z-index: 90;
  font-size: 1.5rem;
  pointer-events: none;
  animation: hwFly var(--dur, 6s) linear forwards, hwBob 0.6s ease-in-out infinite;
}
.hw-bat.rtl { animation-name: hwFlyBack, hwBob; }