.fan-wrap { position: relative; display: inline-flex; }
.fan-src {
  position: absolute;
  width: 1px; height: 1px;
  opacity: 0; pointer-events: none;
  left: 0; top: 0;
}
.fan-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 14px;
  border: 1px solid color-mix(in srgb, var(--ink) 10%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 72%, transparent);
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  color: var(--ink-2);
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  transition: border-color .2s var(--ease, ease), box-shadow .2s var(--ease, ease), transform .18s var(--ease, ease);
}
.fan-trigger:hover { border-color: color-mix(in srgb, var(--accent) 34%, transparent); box-shadow: 0 2px 10px rgba(30, 40, 36, .06); }
.fan-trigger:active { transform: scale(.985); }
.fan-wrap.is-open .fan-trigger {
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 14%, transparent);
}
.ft-caret {
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: .5;
  transition: transform .24s var(--ease, ease);
}
.fan-wrap.is-open .ft-caret { transform: rotate(180deg); }

.fan-layer {
  position: fixed;
  inset: 0;
  z-index: 900;
  opacity: 0;
  transition: opacity .2s var(--ease, ease);
}
.fan-layer.is-in { opacity: 1; }
.fan-stack { position: absolute; width: 0; height: 0; }
.fan-item {
  position: absolute;
  left: 0; top: 0;
  transform: translate(-50%, -100%) translate(0, -160px) rotate(0deg);
  opacity: 0;
  max-width: 260px;
  padding: 9px 15px;
  border: 1px solid color-mix(in srgb, var(--ink) 9%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  color: var(--ink-2);
  font-size: 12.5px;
  line-height: 1.25;
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(24, 34, 30, .10), 0 1px 0 rgba(255, 255, 255, .5) inset;
  transition: transform .32s cubic-bezier(.18, 1.06, .32, 1), opacity .26s var(--ease, ease), background .18s var(--ease, ease), border-color .18s var(--ease, ease);
  will-change: transform, opacity;
}
.fan-stack.is-down .fan-item { transform-origin: 50% 0; }

.fan-item:hover {
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  color: var(--accent-ink);
}
.fan-item.is-on { color: var(--accent-ink); font-weight: 600; }
.fan-item.is-on::after { content: ''; }

.fan-sheet {
  position: absolute;
  transform: translate(-50%, 0);
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, 1fr));
  gap: 6px;
  max-width: 420px;
  padding: 10px;
  border-radius: 16px;
  border: 1px solid color-mix(in srgb, var(--ink) 9%, transparent);
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  backdrop-filter: blur(18px) saturate(1.25);
  -webkit-backdrop-filter: blur(18px) saturate(1.25);
  box-shadow: 0 18px 40px rgba(24, 34, 30, .16);
}
.fan-sheet .fan-item {
  position: static;
  transform: none;
  opacity: 1;
  justify-self: stretch;
  text-align: left;
  max-width: none;
}

/* 深色主题 */
html[data-theme="dark"] .fan-trigger,
html[data-theme="dark"] .fan-item,
html[data-theme="dark"] .fan-sheet {
  background: color-mix(in srgb, #1b1f22 82%, transparent);
  border-color: rgba(255, 255, 255, .1);
  color: var(--ink-2);
  box-shadow: 0 8px 22px rgba(0, 0, 0, .42);
}
html[data-theme="dark"] .fan-item:hover { background: color-mix(in srgb, var(--accent) 24%, #1b1f22); }

/* 低配档位：降模糊 */
html[data-perf="low"] .fan-trigger,
html[data-perf="low"] .fan-item,
html[data-perf="low"] .fan-sheet {
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  background: var(--surface);
}

@media (prefers-reduced-motion: reduce) {
  .fan-item { transition-duration: .01ms; }
}