:root {
  --pond: #061e2c;
  --ink: #eef7f1;
  --ink-soft: rgba(238, 247, 241, 0.62);
  --accent: #e8573a;
  --font-mincho: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --font-gothic: "Zen Kaku Gothic New", "Hiragino Sans", "Helvetica Neue", sans-serif;
  color-scheme: dark;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--pond);
}

canvas {
  display: block;
}

.label {
  position: fixed;
  left: max(20px, env(safe-area-inset-left, 0px));
  bottom: calc(18px + env(safe-area-inset-bottom, 0px));
  color: var(--ink);
  pointer-events: none;
  user-select: none;
}

.label h1 {
  margin: 0;
  font-family: var(--font-mincho);
  font-weight: 500;
  font-size: 22px;
  letter-spacing: 0.02em;
}

.label p {
  margin: 4px 0 0;
  font-family: var(--font-gothic);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.hint {
  position: fixed;
  left: 50%;
  bottom: calc(22px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  font-family: var(--font-gothic);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  pointer-events: none;
  transition: opacity 1.2s ease;
  white-space: nowrap;
}

.hint.gone {
  opacity: 0;
}

.sound {
  position: fixed;
  right: max(20px, env(safe-area-inset-right, 0px));
  bottom: calc(18px + env(safe-area-inset-bottom, 0px));
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid rgba(238, 247, 241, 0.28);
  border-radius: 999px;
  background: rgba(4, 22, 32, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: var(--ink);
  font-family: var(--font-gothic);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.sound:hover {
  border-color: rgba(238, 247, 241, 0.6);
}

.sound:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

.sound-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: 1px solid var(--ink-soft);
  transition: background 0.3s ease;
}

.sound[aria-pressed="true"] .sound-dot {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

@media (max-width: 560px) {
  .hint {
    bottom: auto;
    top: calc(18px + env(safe-area-inset-top, 0px));
  }
}