/* shell.css — menu bar, menus, Dock, desktop icons, Spotlight, toasts, alert sheets, drag ghost (DESIGN §2). */

/* ------------------------------------------------------------- menu bar */
/* Transparent over the wallpaper, white text (as on the owner's Mac). Only a very soft shade at the top keeps the white text
   readable over the bright sky of the photo; it fades to nothing, so no bar edge is visible. */
#lab-menubar {
  height: 28px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 8px 0 6px;
  background: linear-gradient(180deg, rgba(8, 28, 56, .2) 0%, rgba(8, 28, 56, .08) 60%, rgba(8, 28, 56, 0) 100%);
  color: #fff;
  font-size: 13px; font-weight: 500;
  text-shadow: 0 0 3px rgba(0, 20, 50, .35);
  white-space: nowrap;
}
.lab-mb-left, .lab-mb-right { display: flex; align-items: center; height: 100%; }
.lab-mb-right { gap: 2px; }
.lab-mb-title, .lab-mb-btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 22px; padding: 0 10.5px; margin: 0;
  background: none; border: 0; border-radius: 5px;
  color: #fff; font: inherit; font-weight: 500; line-height: 1; text-shadow: inherit;
  cursor: default;
}
.lab-mb-title:hover, .lab-mb-title.is-open, .lab-mb-btn:hover, .lab-mb-btn.is-open { background: rgba(255, 255, 255, .18); }
.lab-mb-app { font-weight: 700; }
.lab-mb-markbtn { padding: 0 10px; }
.lab-mb-mark { display: inline-flex; color: #fff; filter: drop-shadow(0 0 2px rgba(0, 20, 50, .3)); }
.lab-mb-btn { padding: 0 9px; }
.lab-mb-btn svg { filter: drop-shadow(0 0 2px rgba(0, 20, 50, .3)); }
/* Wi-Fi joining a network: dim arcs light up one after another from the dot outward, as on the real menu bar */
.lab-mb-wifi.is-joining .wf0, .lab-mb-wifi.is-joining .wf1, .lab-mb-wifi.is-joining .wf2, .lab-mb-wifi.is-joining .wf3 {
  opacity: .3; animation: lab-wifi-join 1.4s ease-in-out infinite;
}
.lab-mb-wifi.is-joining .wf1 { animation-delay: .15s; }
.lab-mb-wifi.is-joining .wf2 { animation-delay: .3s; }
.lab-mb-wifi.is-joining .wf3 { animation-delay: .45s; }
@keyframes lab-wifi-join { 0%, 55%, 100% { opacity: .3; } 18%, 38% { opacity: 1; } }
/* input-method badge: white rounded box with a dark character, like the 注 badge on the real menu bar */
.lab-mb-right .lab-mb-ime, .lab-mb-right .lab-mb-ime:hover, .lab-mb-right .lab-mb-ime.is-open {
  width: 26px; height: 18px; min-width: 0; padding: 0; margin: 0 6px;
  background: rgba(255, 255, 255, .96); color: #1d1d1f; border-radius: 5px;
  font-size: 12.5px; font-weight: 700; text-shadow: none;
}
.lab-mb-clock { padding: 0 8px 0 10px; }

/* ---------------------------------------------------------------- menus */
.lab-menu {
  position: absolute; z-index: var(--z-menu);
  min-width: 200px; padding: 5px;
  background: rgba(246, 246, 246, .94);
  -webkit-backdrop-filter: blur(30px) saturate(1.8);
  backdrop-filter: blur(30px) saturate(1.8);
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .35), 0 0 0 .5px rgba(0, 0, 0, .28);
  color: #1d1d1f; font-size: 13px; line-height: 1.3;
  outline: none;
  animation: lab-fade-in .1s ease-out;
}
.lab-mi { display: flex; align-items: center; gap: 4px; padding: 3px 12px 3px 4px; min-height: 22px; border-radius: 5px; white-space: nowrap; cursor: default; }
.lab-mi-check { width: 16px; text-align: center; font-size: 12px; flex: none; }
.lab-mi-label { flex: 1; }
.lab-mi-sc { margin-left: 28px; color: rgba(0, 0, 0, .5); letter-spacing: .03em; }
.lab-mi-arrow { margin-left: 24px; font-size: 15px; line-height: 1; color: rgba(0, 0, 0, .55); }
.lab-mi.is-hl { background: var(--mac-accent); color: #fff; }
.lab-mi.is-hl .lab-mi-sc, .lab-mi.is-hl .lab-mi-arrow { color: rgba(255, 255, 255, .85); }
.lab-mi.is-disabled { color: rgba(0, 0, 0, .3); }
.lab-mi.is-disabled.is-hl { background: transparent; color: rgba(0, 0, 0, .3); }
.lab-mi.is-disabled .lab-mi-sc { color: rgba(0, 0, 0, .25); }
.lab-mi-sep { height: 1px; margin: 5px 8px; background: rgba(0, 0, 0, .12); }
@keyframes lab-fade-in { from { opacity: 0; } to { opacity: 1; } }

.lab-popover {
  position: absolute; z-index: var(--z-menu);
  padding: 10px 12px; border-radius: 12px;
  background: rgba(246, 246, 246, .94);
  -webkit-backdrop-filter: blur(30px) saturate(1.8);
  backdrop-filter: blur(30px) saturate(1.8);
  box-shadow: 0 10px 30px rgba(0, 0, 0, .35), 0 0 0 .5px rgba(0, 0, 0, .28);
  color: #1d1d1f; font-size: 13px;
}
.lab-cc-row { display: flex; align-items: center; gap: 12px; margin: 6px 0 10px; }
.lab-cc-row label { width: 48px; color: var(--mac-text-2); }
.lab-cc-row input[type=range] { flex: 1; }
.lab-cc-note { color: var(--mac-text-2); font-size: 12px; }

/* ----------------------------------------------------------------- Dock
   Tahoe-style light frosted bar. Proportions follow the real Dock (icon : gap : bar height = 1 : .33 : 1.5):
   58 px tile (the art leaves ~12% margin, so about 51 px is visible), 8 px gap (round 7: with the squircle margins the art-to-art space is then ~15 px = 0.3 of an icon, as on the teacher's real
   Dock; the old 14 px gap made 16 icons shrink the whole Dock), 16 px side padding, 28 px radius. */
#lab-dock { display: flex; justify-content: center; }
.lab-dock-bar {
  pointer-events: auto;
  display: flex; align-items: flex-end; gap: 12px;
  padding: 10px 16px 5px;
  border-radius: 28px;
  background: linear-gradient(180deg, rgba(255, 255, 255, .34), rgba(255, 255, 255, .2));   /* round 7: clearer glass, as on the teacher's real Dock */
  -webkit-backdrop-filter: blur(22px) saturate(1.8) brightness(1.1);
  backdrop-filter: blur(22px) saturate(1.8) brightness(1.1);
  border: 1px solid rgba(255, 255, 255, .5);
  box-shadow: 0 8px 26px rgba(0, 0, 0, .24), inset 0 1px 0 rgba(255, 255, 255, .45), inset 0 0 0 .5px rgba(255, 255, 255, .18);
}
.lab-dock-sec { display: flex; align-items: flex-end; gap: 8px; }
.lab-dock-div { width: 1px; align-self: stretch; margin: 2px 0 6px; background: rgba(20, 30, 40, .34); }
.lab-dock-item {
  position: relative;
  width: 58px; height: 68px; padding: 0; margin: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: flex-start;
  background: none; border: 0; border-radius: 14px;
  cursor: default;
}
.lab-dock-icon { display: block; width: 58px; height: 58px; transform-origin: 50% 100%; transition: transform .08s ease-out; border-radius: 14px; }
.lab-dock-icon svg { display: block; width: 100%; height: 100%; filter: drop-shadow(0 1px 2px rgba(0, 0, 0, .22)); }
.lab-dock-dot { position: absolute; bottom: 1px; left: 50%; width: 4px; height: 4px; margin-left: -2px; border-radius: 50%; background: rgba(20, 24, 30, .78); opacity: 0; }
.lab-dock-item.is-running .lab-dock-dot { opacity: 1; }
.lab-dock-item.is-drop .lab-dock-icon { background: rgba(255, 255, 255, .45); box-shadow: 0 0 0 2px rgba(255, 255, 255, .75); }
/* pressing a Dock icon darkens it until the button comes up, as on a Mac */
.lab-dock-item:active .lab-dock-icon svg { filter: brightness(.7) drop-shadow(0 1px 2px rgba(0, 0, 0, .22)); }
.lab-dock-label {
  position: absolute; bottom: calc(100% + 22px); left: 50%; transform: translateX(-50%);
  padding: 3px 10px; border-radius: 7px;
  background: rgba(40, 40, 44, .88); color: #fff;
  font-size: 12px; font-weight: 500; white-space: nowrap;
  opacity: 0; pointer-events: none; transition: opacity .12s;
  z-index: 3;
}
.lab-dock-item:hover .lab-dock-label, .lab-dock-item:focus-visible .lab-dock-label { opacity: 1; }
.lab-dock-item.is-bounce .lab-dock-icon { animation: lab-bounce .24s ease-in-out 3; }
@keyframes lab-bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
.lab-dock-mini { gap: 8px; }
.lab-thumb-win { display: block; width: 50px; height: 36px; margin: 22px 4px 0; border-radius: 5px; background: #f4f4f4; box-shadow: inset 0 0 0 .5px rgba(0, 0, 0, .3), 0 2px 5px rgba(0, 0, 0, .25); overflow: hidden; transform-origin: 50% 100%; }
.lab-thumb-bar { display: block; height: 7px; background: #dcdcdc; }
.lab-thumb-line { display: block; height: 3px; margin: 4px 5px 0; border-radius: 2px; background: rgba(0, 0, 0, .14); }
.lab-thumb-line.is-short { margin-right: 18px; }
.lab-thumb-win.is-dark { background: #1e1e20; }
.lab-thumb-win.is-dark .lab-thumb-bar { background: #38383b; }
.lab-thumb-win.is-dark .lab-thumb-line { background: rgba(255, 255, 255, .22); }
.lab-thumb-more { display: flex; align-items: center; justify-content: center; margin-top: 22px; font-size: 14px; font-weight: 700; color: #333; }
.lab-dock-thumb[hidden], .lab-dock-more[hidden] { display: none; }
.lab-thumb-badge { position: absolute; right: -2px; bottom: 12px; width: 22px; height: 22px; display: block; }

/* -------------------------------------------------------- desktop icons */
.lab-dicon {
  position: absolute; width: 96px; height: 100px; padding-top: 6px;
  display: flex; flex-direction: column; align-items: center;
  cursor: default; outline: none;
}
.lab-dicon-img { width: 64px; height: 64px; display: flex; align-items: center; justify-content: center; border-radius: 10px; }
.lab-dicon-img svg { filter: drop-shadow(0 2px 3px rgba(0, 0, 0, .35)); }
.lab-dicon.is-sel .lab-dicon-img { background: rgba(255, 255, 255, .24); }
.lab-dicon.is-drop .lab-dicon-img { background: rgba(255, 255, 255, .34); box-shadow: 0 0 0 2px rgba(10, 108, 255, .8); }
.lab-dicon-label {
  margin-top: 4px; max-width: 92px; padding: 1px 6px; border-radius: 5px;
  font-size: 12px; font-weight: 700; line-height: 1.25; text-align: center; color: #fff;
  text-shadow: 0 1px 2px rgba(0, 0, 0, .5), 0 0 5px rgba(0, 0, 0, .28);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; word-break: break-all;
}
.lab-dicon.is-sel .lab-dicon-label { background: var(--mac-accent); text-shadow: none; }
#lab-desktop:not(.is-key) .lab-dicon.is-sel .lab-dicon-label { background: rgba(120, 120, 125, .78); }
.lab-dicon.is-renaming .lab-dicon-label { background: none; padding: 0; overflow: visible; display: block; }
.lab-dicon-edit {
  width: 92px; padding: 1px 3px; border: 1px solid var(--mac-accent); border-radius: 3px;
  background: #fff; color: #000; font: 12px/1.25 var(--lab-font-ui); text-align: center; text-shadow: none;
  outline: 3px solid rgba(10, 108, 255, .35); -webkit-user-select: text; user-select: text;
}
/* the rubber band: a translucent blue box with a thin edge that shows on bright sky and on dark water alike */
.lab-rubber { position: absolute; border: 1px solid rgba(96, 156, 255, .9); background: rgba(60, 124, 255, .2); border-radius: 2px; pointer-events: none; }
/* free placement (round 6). While icons are dragged each one is a translucent copy that keeps its place among the others; the originals
   stay where they were, dimmed. Sorting, 整理 and a screen that changed size slide the icons into place (dragging never does). */
.lab-dicon.is-dragsrc { opacity: .4; }
.lab-dicon-ghost { pointer-events: none; opacity: .82; will-change: transform; }
.lab-dicon-count {
  position: absolute; top: 0; right: 12px; min-width: 20px; height: 20px; padding: 0 6px; border-radius: 10px;
  background: #ff3b30; box-shadow: 0 0 0 1.5px rgba(255, 255, 255, .95);
  color: #fff; font-size: 12px; font-weight: 700; line-height: 20px; text-align: center;
}
.lab-dicon-badge {
  position: absolute; top: 8px; left: 10px; width: 18px; height: 18px; box-sizing: border-box; border-radius: 50%; border: 2px solid #fff;
  color: #fff; font: 700 13px/14px sans-serif; text-align: center; display: none;
}
.lab-dicon-badge.is-copy { display: block; background: #34c759; }
.lab-dicon-badge.is-link { display: block; background: #8e8e93; font-size: 11px; }
body.lab-dd-own .lab-ghost { visibility: hidden; }
#lab-desktop.is-arranging .lab-dicon { transition: left .18s var(--lab-ease), top .18s var(--lab-ease); }
/* ------------------------------------------------------------ Spotlight */
.lab-spot { position: absolute; top: 0; right: 0; bottom: 0; left: 0; inset: 0; z-index: var(--z-spotlight); pointer-events: auto; }
.lab-spot-panel {
  position: absolute; left: 50%; top: 18%; transform: translateX(-50%);
  width: 640px; max-width: calc(100% - 32px);
  background: rgba(246, 246, 246, .92);
  -webkit-backdrop-filter: blur(36px) saturate(1.8);
  backdrop-filter: blur(36px) saturate(1.8);
  border-radius: 16px;
  box-shadow: 0 18px 60px rgba(0, 0, 0, .45), 0 0 0 .5px rgba(0, 0, 0, .3);
  overflow: hidden;
  color: #1d1d1f;
}
.lab-spot-field { display: flex; align-items: center; gap: 10px; padding: 12px 18px; }
.lab-spot-glass { display: inline-flex; color: rgba(0, 0, 0, .5); }
.lab-spot-input { flex: 1; min-width: 0; border: 0; outline: none; background: transparent; font: 22px/1.3 var(--lab-font-ui); color: #1d1d1f; -webkit-user-select: text; user-select: text; }
.lab-spot-input::placeholder { color: rgba(0, 0, 0, .35); }
.lab-spot-list { max-height: 340px; overflow-y: auto; padding: 0 8px; }
.lab-spot.has-results .lab-spot-list { border-top: 1px solid rgba(0, 0, 0, .1); padding: 6px 8px 8px; }
.lab-spot-group { padding: 6px 10px 2px; font-size: 11px; color: rgba(0, 0, 0, .5); font-weight: 600; }
.lab-spot-row { display: flex; align-items: center; gap: 10px; padding: 5px 10px; border-radius: 7px; font-size: 14px; }
.lab-spot-row.is-hl { background: var(--mac-accent); color: #fff; }
.lab-spot-ico { display: inline-flex; flex: none; }
.lab-spot-label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lab-spot-sub { font-size: 12px; color: rgba(0, 0, 0, .45); white-space: nowrap; }
.lab-spot-row.is-hl .lab-spot-sub { color: rgba(255, 255, 255, .8); }
.lab-spot-none { padding: 14px; color: rgba(0, 0, 0, .5); font-size: 13px; text-align: center; }

/* ---------------------------------------------------------------- toasts */
.lab-toasts { position: absolute; left: 0; right: 0; bottom: 104px; z-index: var(--z-toast); display: flex; flex-direction: column-reverse; align-items: center; gap: 8px; pointer-events: none !important; }
.lab-toast {
  max-width: 80%; padding: 9px 16px; border-radius: 10px;
  background: rgba(30, 30, 34, .94); color: #fff; font-size: 13px; line-height: 1.4;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .3);
  opacity: 0; transform: translateY(6px); transition: opacity .2s, transform .2s;
  pointer-events: auto;
}
.lab-toast.is-in { opacity: 1; transform: none; }

/* ----------------------------------------------------------- alert sheets */
.lab-sheet-scrim { position: absolute; top: 0; right: 0; bottom: 0; left: 0; inset: 0; z-index: 60; pointer-events: auto; background: rgba(0, 0, 0, 0); transition: background .2s; border-radius: inherit; }
.lab-sheet-scrim.is-in { background: rgba(0, 0, 0, .1); }
.lab-sheet-scrim.is-stage { z-index: var(--z-spotlight); }
.lab-sheet-scrim.is-stage.is-in { background: rgba(0, 0, 0, .14); }
.lab-sheet {
  position: absolute; left: 50%; width: 340px; max-width: calc(100% - 24px);
  padding: 18px 20px 14px;
  background: rgba(246, 246, 246, .97);
  box-shadow: 0 10px 30px rgba(0, 0, 0, .3), 0 0 0 .5px rgba(0, 0, 0, .25);
  color: #1d1d1f; font-size: 13px; line-height: 1.45;
  -webkit-user-select: text; user-select: text;
}
.lab-sheet.is-attached { top: var(--mac-bar-h); transform: translate(-50%, -14px); opacity: 0; border-radius: 0 0 12px 12px; transition: transform .2s var(--lab-ease), opacity .2s; }
.bar-unified .lab-sheet.is-attached { top: 52px; }
.bar-hidden .lab-sheet.is-attached { top: 0; }
.lab-sheet-scrim.is-in .lab-sheet.is-attached { transform: translate(-50%, 0); opacity: 1; }
.lab-sheet.is-centered { top: 24%; transform: translate(-50%, 0) scale(.97); opacity: 0; border-radius: 12px; transition: transform .2s var(--lab-ease), opacity .2s; }
.lab-sheet-scrim.is-in .lab-sheet.is-centered { transform: translate(-50%, 0) scale(1); opacity: 1; }
.lab-sheet-title { font-weight: 700; margin-bottom: 4px; }
.lab-sheet-text { color: #4a4a4f; font-size: 12px; }
.lab-sheet-input { width: 100%; margin-top: 10px; padding: 4px 8px; border: 1px solid rgba(0, 0, 0, .25); border-radius: 5px; font: 13px var(--lab-font-ui); background: #fff; outline: 3px solid rgba(10, 108, 255, .35); }
.lab-sheet-btns { display: flex; justify-content: flex-end; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.lab-sheet-btn {
  min-width: 64px; padding: 3px 14px; margin: 0; border: .5px solid rgba(0, 0, 0, .22); border-radius: 6px;
  background: #fff; color: #1d1d1f; font: 13px var(--lab-font-ui); cursor: default;
  box-shadow: 0 1px 1px rgba(0, 0, 0, .08);
}
.lab-sheet-btn.is-default { background: var(--mac-accent); border-color: var(--mac-accent); color: #fff; }
.lab-sheet-btn.is-danger:not(.is-default) { color: #d70015; }

/* -------------------------------------------------------- drag and drop */
.lab-ghost { position: absolute; left: 0; top: 0; width: 84px; display: flex; flex-direction: column; align-items: center; opacity: .72; pointer-events: none; z-index: var(--z-dnd); }
.lab-ghost-icons { position: relative; width: 48px; height: 48px; }
.lab-ghost-label { margin-top: 2px; max-width: 100px; padding: 1px 6px; border-radius: 4px; background: rgba(0, 0, 0, .55); color: #fff; font-size: 11px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lab-ghost-count { position: absolute; top: -6px; right: 12px; min-width: 18px; height: 18px; padding: 0 5px; border-radius: 9px; background: #ff3b30; color: #fff; font-size: 11px; line-height: 18px; text-align: center; font-weight: 700; }
.lab-ghost-badge { position: absolute; top: -4px; left: 14px; width: 16px; height: 16px; border-radius: 50%; border: 2px solid #fff; box-sizing: content-box; margin: -2px; font: 700 13px/16px sans-serif; color: #fff; text-align: center; display: none; }
.lab-ghost-badge.is-copy { display: block; background: #34c759; }
.lab-ghost-badge.is-link { display: block; background: #8e8e93; font-size: 11px; }

/* --------------------------------------------- performance mode (§2.10) */
html[data-perf="low"] #lab-menubar { background: linear-gradient(180deg, rgba(8, 28, 56, .5) 0%, rgba(8, 28, 56, .24) 70%, rgba(8, 28, 56, 0) 100%); }
html[data-perf="low"] .lab-dock-bar { background: rgba(214, 222, 232, .78); -webkit-backdrop-filter: none; backdrop-filter: none; }
html[data-perf="low"] .lab-menu, html[data-perf="low"] .lab-popover { background: rgba(246, 246, 246, .98); -webkit-backdrop-filter: none; backdrop-filter: none; animation-duration: .1s; }
html[data-perf="low"] .lab-spot-panel { background: rgba(246, 246, 246, .98); -webkit-backdrop-filter: none; backdrop-filter: none; }
html[data-perf="low"] .lab-sheet { background: rgba(246, 246, 246, 1); }
html[data-perf="low"] .lab-dock-icon { transition: none; }
html[data-perf="low"] .lab-toast, html[data-perf="low"] .lab-sheet-scrim, html[data-perf="low"] .lab-sheet { transition-duration: .1s; }