/* aim-app-shell.css · N1 · v1 · the web half of the L2 shell (AIM apps rules 21, 22, 31, 32, 34, 35, 39).
   Pairs with aim-mini-apps.css (tokens, loaded first) and aim-app-mark.js (the mark).
   One header, one pin, one tab strip and one footer line for every browser surface of the family:
   the Aside Tweaks popup, panel and palette, and the product-style page on apps.aimindset.org.
   Values only through the generated tokens; no colour, radius or duration is written out here.

     <div class="aim-shell">
       <header class="aim-shell-head">
         <span class="aim-shell-mark" data-aim-mark="aside"></span>
         <span class="aim-shell-title"><b>aside tweaks</b><small>4.22.0 · this browser</small></span>
         <span class="aim-shell-gap"></span>
         <span class="aim-shell-version">4.22.0</span>
         <button class="aim-shell-btn">settings</button>
         <button class="aim-shell-btn aim-shell-pin" id="pin-panel" aria-pressed="false">○</button>
         <button class="aim-shell-btn aim-shell-icon" data-close>×</button>
       </header>
       <nav class="aim-shell-tabs"><button class="aim-shell-tab" aria-selected="true">rows</button>…</nav>
       <div class="aim-shell-body">
         <button class="aim-shell-row" aria-selected="false">
           <span class="aim-shell-row-mark" data-aim-mark="prism"></span>
           <span class="aim-shell-row-body"><b>memory pressure</b><small>normal · read 40 s ago</small></span>
           <span class="aim-shell-row-reason">fresh</span>
         </button>
       </div>
       <footer class="aim-shell-foot"><span>1 rows · 2 sites</span><span>esc close</span><span>4.22.0</span></footer>
     </div> */

.aim-shell {
  --aim-shell-inset: var(--aim-p-space16);
  --aim-shell-gap: var(--aim-p-space8);
  --aim-shell-control: 28px;
  --aim-shell-mark: 40px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: var(--aim-shell-inset);
  padding: var(--aim-shell-inset);
  background: var(--aim-s-canvas);
  color: var(--aim-s-text);
  font-family: var(--aim-s-font);
  font-size: var(--aim-s-size-meta);
  line-height: 1.4;
}
.aim-shell *, .aim-shell *::before, .aim-shell *::after { box-sizing: border-box; }

/* header · rule 32: mark · name · status under the name · version · settings · pin · x */
.aim-shell-head {
  display: flex;
  align-items: center;
  gap: var(--aim-shell-gap);
  min-height: var(--aim-shell-mark);
}
.aim-shell-mark {
  flex: 0 0 var(--aim-shell-mark);
  width: var(--aim-shell-mark);
  height: var(--aim-shell-mark);
  color: var(--aim-c-logo-ink);
  display: inline-flex;
}
.aim-shell-mark svg { width: 100%; height: 100%; display: block; }
.aim-shell-title { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.aim-shell-title b {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.aim-shell-title small {
  font-size: 10px;
  font-weight: 500;
  color: var(--aim-s-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.aim-shell-gap { flex: 1 1 auto; min-width: var(--aim-shell-gap); }
.aim-shell-version {
  font-size: var(--aim-s-size-meta);
  font-weight: 500;
  color: var(--aim-s-text-secondary);
  white-space: nowrap;
}

/* one button look for the whole shell (28 pt, 8 pt corners, hover fill, visible focus) */
.aim-shell-btn {
  height: var(--aim-shell-control);
  min-width: var(--aim-shell-control);
  padding: 0 12px;
  border: 1px solid var(--aim-c-button-border);
  border-radius: var(--aim-c-button-radius);
  background: var(--aim-c-button-background);
  color: var(--aim-s-text-secondary);
  font: inherit;
  font-size: var(--aim-s-size-meta);
  font-weight: 400;
  cursor: pointer;
  transition: background var(--aim-s-motion-state) var(--aim-s-motion-ease), color var(--aim-s-motion-state) var(--aim-s-motion-ease);
}
.aim-shell-btn:hover { background: var(--aim-c-button-hover); color: var(--aim-s-text); }
.aim-shell-btn[aria-pressed="true"], .aim-shell-btn[data-active="true"] {
  background: var(--aim-c-button-hover);
  color: var(--aim-s-text);
  font-weight: 600;
}
.aim-shell-btn:disabled { color: var(--aim-s-text-disabled); cursor: default; }
.aim-shell-btn:focus-visible { outline: 2px solid var(--aim-c-focus-ring); outline-offset: 2px; }
.aim-shell-icon { padding: 0; width: var(--aim-shell-control); }
.aim-shell-pin { padding: 0; width: var(--aim-shell-control); font-size: 12px; }

/* tab strip · views only, the active view carries the one red mark */
.aim-shell-tabs { display: flex; align-items: center; gap: 3px; flex-wrap: wrap; }
.aim-shell-tab {
  position: relative;
  height: 30px;
  padding: 0 12px;
  border: 0;
  border-radius: var(--aim-c-button-radius);
  background: transparent;
  color: var(--aim-s-text-secondary);
  font: inherit;
  font-size: var(--aim-s-size-meta);
  cursor: pointer;
}
.aim-shell-tab:hover { background: var(--aim-c-button-hover); color: var(--aim-s-text); }
.aim-shell-tab[aria-selected="true"] { background: var(--aim-c-button-hover); color: var(--aim-s-text); font-weight: 600; }
.aim-shell-tab[aria-selected="true"]::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 0;
  height: 2px;
  /* a 2 px bar clamps any corner to half its height, so the shared button radius reads as the pill it is */
  border-radius: var(--aim-c-button-radius);
  background: var(--aim-s-selection);
}
.aim-shell-tab:focus-visible { outline: 2px solid var(--aim-c-focus-ring); outline-offset: 2px; }

.aim-shell-body { flex: 1 1 auto; min-height: 0; }

/* list row · rule 35: mark or letter square 16 pt · title · subtitle muted · the reason it is here */
.aim-shell-rows { display: flex; flex-direction: column; }
.aim-shell-row {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  min-height: 36px;
  padding: 6px 8px;
  border: 0;
  border-bottom: 1px solid var(--aim-s-divider);
  background: transparent;
  color: var(--aim-s-text);
  font: inherit;
  font-size: 12px;
  text-align: left;
  cursor: pointer;
}
.aim-shell-row:hover { background: var(--aim-s-hover); }
.aim-shell-row[aria-selected="true"] { background: var(--aim-s-selected); box-shadow: inset 2px 0 var(--aim-s-selection); }
.aim-shell-row:focus-visible { outline: 2px solid var(--aim-c-focus-ring); outline-offset: -2px; }
.aim-shell-row-mark {
  flex: none;
  width: 16px;
  height: 16px;
  display: inline-flex;
  color: var(--aim-c-logo-ink);
}
.aim-shell-row-mark svg { width: 100%; height: 100%; display: block; }
.aim-shell-row-letter {
  flex: none;
  width: 16px;
  height: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--aim-s-data);
  border-radius: 4px;
  font-size: 10px;
  font-weight: 500;
}
.aim-shell-row-body { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; gap: 1px; }
.aim-shell-row-body b {
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.aim-shell-row-body small { font-size: 11px; color: var(--aim-s-text-secondary); }
.aim-shell-row-reason { flex: none; font-size: 11px; color: var(--aim-s-text-secondary); }

/* footer · rule 22: keys · esc close · version and status, one row, three parts */
.aim-shell-foot {
  display: flex;
  align-items: center;
  gap: var(--aim-p-space16);
  font-size: var(--aim-s-size-meta);
  font-weight: 500;
  color: var(--aim-s-text-secondary);
  white-space: nowrap;
}
.aim-shell-foot > :first-child { flex: 0 1 auto; overflow: hidden; text-overflow: ellipsis; }
.aim-shell-foot > :nth-child(2) { flex: 0 0 auto; }
.aim-shell-foot > :last-child { flex: 1 1 auto; text-align: right; overflow: hidden; text-overflow: ellipsis; }

/* appearance · rule 28: the content is laid out first, then one shared transition */
.aim-shell[data-appear] {
  animation: aim-shell-appear var(--aim-s-motion-window-appear) var(--aim-s-motion-ease) both;
}
@keyframes aim-shell-appear {
  from { opacity: 0; transform: translateY(var(--aim-s-motion-window-appear-shift)); }
  to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .aim-shell[data-appear] { animation: none; }
  .aim-shell-btn, .aim-shell-tab, .aim-shell-row { transition: none; }
}

/* the mark · mono drops the red signal the way the menu bar template image does.
   aim-app-mark.js clones the symbol children into the mark, so the signal is a light-DOM node here:
   a mono mark is built without it and this rule covers a mark whose markup was written by hand. */
.aim-mark { display: inline-block; color: var(--aim-c-logo-ink); }
.aim-mark svg { width: 100%; height: 100%; display: block; }
.aim-mark[data-mono] .aim-mark-signal { display: none; }