:root {
  --bg0: #0b0e1a;
  --bg1: #1a1f3a;
  --glass: rgba(22, 27, 52, 0.72);
  --border: rgba(140, 160, 255, 0.18);
  --text: #e6e9ff;
  --muted: #8f97c4;
  --accent: #7c8cff;
  --x: #ff6b7a;
  --y: #6be3a0;
  --z: #6bb6ff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  color: var(--text);
  font-family: "Segoe UI", "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  background: radial-gradient(ellipse at 50% 40%, var(--bg1), var(--bg0) 70%);
  user-select: none;
}

#stage {
  position: fixed;
  inset: 0;
}
#stage canvas { display: block; cursor: grab; }
#stage canvas:active { cursor: grabbing; }

/* ---------- HUD ---------- */
.hud {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 10px 18px;
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.hud h1 {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--accent);
}
.hud h1 span {
  margin-left: 6px;
  color: var(--text);
  font-weight: 300;
  letter-spacing: 0.18em;
}

.stats { display: flex; align-items: center; gap: 12px; }

.stat {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 84px;
  padding: 6px 10px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.35);
  font-family: "Consolas", "SF Mono", monospace;
  font-size: 20px;
  font-weight: 700;
  color: #ffcf6b;
}
.stat .icon { font-size: 16px; }
#timer { min-width: 5ch; }

.face {
  width: 44px;
  height: 44px;
  font-size: 24px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: rgba(124, 140, 255, 0.15);
  cursor: pointer;
  transition: transform 0.15s, background 0.15s;
}
.face:hover { transform: scale(1.08); background: rgba(124, 140, 255, 0.3); }
.face:active { transform: scale(0.95); }

select, button { font: inherit; color: var(--text); }

#difficulty {
  padding: 6px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.35);
  cursor: pointer;
}
#difficulty option { background: var(--bg1); }

/* ---------- Side panel ---------- */
.panel {
  position: fixed;
  top: 50%;
  left: 16px;
  transform: translateY(-50%);
  width: 220px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.panel h2 {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--muted);
}

input[type="range"] { width: 100%; accent-color: var(--accent); }
input[type="range"]:disabled { opacity: 0.35; }

.seg {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 4px;
  padding: 3px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.35);
}
.seg button {
  padding: 6px 0;
  border: none;
  border-radius: 7px;
  background: transparent;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}
.seg button:hover { background: rgba(255, 255, 255, 0.07); }
.seg button.active { background: var(--accent); color: #0b0e1a; }
.seg .ax-x { color: var(--x); }
.seg .ax-y { color: var(--y); }
.seg .ax-z { color: var(--z); }
.seg .ax-x.active { background: var(--x); }
.seg .ax-y.active { background: var(--y); }
.seg .ax-z.active { background: var(--z); }

.layer-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
}
#layer-label {
  width: 24px;
  text-align: center;
  font-weight: 700;
  font-family: monospace;
}

.memo-palette { display: flex; gap: 8px; }
.memo-palette button {
  width: 28px;
  height: 28px;
  padding: 0;
  border: 2px solid transparent;
  border-radius: 50%;
  background: var(--memo-color);
  cursor: pointer;
}
.memo-palette button.active { outline: 2px solid var(--text); outline-offset: 2px; }
.memo-palette button:focus-visible { outline: 2px solid var(--text); outline-offset: 3px; }

.toggle {
  width: 100%;
  padding: 8px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.35);
  cursor: pointer;
}
.toggle.on { background: rgba(229, 72, 77, 0.35); border-color: #e5484d; }

.help p {
  margin: 4px 0;
  font-size: 12px;
  color: var(--muted);
}
.help kbd {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  font-family: inherit;
  font-size: 11px;
}
.help .note { margin-top: 10px; font-style: italic; }

/* ---------- Overlay ---------- */
.overlay {
  position: fixed;
  left: 50%;
  bottom: 40px;
  transform: translateX(-50%);
  transition: opacity 0.3s, transform 0.3s;
}
.overlay.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 20px);
}
.card {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 14px 20px;
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}
.card .title { font-size: 22px; font-weight: 800; }
.card .sub { color: var(--muted); }
.card button {
  padding: 8px 16px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #0b0e1a;
  font-weight: 700;
  cursor: pointer;
}

@media (max-width: 760px) {
  .hud { flex-wrap: wrap; justify-content: center; gap: 10px; width: calc(100% - 32px); }
  .panel { top: auto; bottom: 16px; transform: none; width: auto; right: 16px; flex-direction: row; flex-wrap: wrap; gap: 12px; }
  .panel section { flex: 1 1 140px; }
  .help { display: none; }
  .overlay { bottom: auto; top: 140px; }
}