/* ferro shell: topbar, sidebar (switcher + panels), main, inspector, status bar */

.app {
  height: 100vh;
  display: grid;
  grid-template-rows: var(--h-topbar) auto minmax(0, 1fr) var(--h-status);
  background: var(--bg-chrome);
}
/* explicit rows: the banner row may be empty and must not shift the others */
.topbar { grid-row: 1; }
.banners { grid-row: 2; }
.body { grid-row: 3; }
.statusbar { grid-row: 4; }
.banners:empty { display: none; }

/* ---------- topbar ---------- */
.topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 560px) minmax(0, 1fr);
  align-items: center;
  gap: var(--sp-6);
  padding: 0 var(--sp-4) 0 var(--sp-3);
  border-bottom: 1px solid var(--border);
  background: var(--bg-chrome);
  user-select: none;
}
.tb-left, .tb-right { display: flex; align-items: center; gap: var(--sp-1); min-width: 0; }
.tb-right { justify-content: flex-end; }
.tb-divider { width: 1px; height: 16px; margin: 0 var(--sp-3); background: var(--border-strong); flex: none; }

.brand { display: grid; place-items: center; flex: none; width: 32px; height: 32px; border-radius: var(--r-md); }
.brand:hover { background: var(--hover); }

/* the forge square (docs/BRAND.md): the one place the UI keeps brand color */
.mark {
  position: relative; flex: none;
  display: inline-grid; place-items: center;
  width: 22px; height: 22px; border-radius: 22%;
  background: linear-gradient(135deg, #ff8c2e 0%, #f2542d 55%, #c22e3d 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.18);
}
.mark svg { width: 62%; height: 62%; fill: #fff; stroke: none; }
.mark.sm { width: 16px; height: 16px; }
.mark.lg { width: 40px; height: 40px; }

/* boot splash (static markup in index.html, replaced when the shell mounts) */
.boot { position: fixed; inset: 0; display: grid; place-items: center; background: var(--bg-chrome); }
.boot .mark { animation: boot-in var(--dur-3) 160ms both, boot-pulse 1.4s ease-in-out 600ms infinite; }
@keyframes boot-in { from { opacity: 0; transform: scale(0.94); } }
@keyframes boot-pulse { 50% { opacity: 0.55; } }

.ws-chip {
  display: flex; align-items: center; gap: var(--sp-4);
  min-width: 0; height: 28px; padding: 0 var(--sp-4);
  border-radius: var(--r-md);
}
.ws-chip:hover { background: var(--hover); }
/* The project name opens the project picker: a caret says so. */
.ws-chip::after { content: ''; flex: none; width: 0; height: 0; margin-left: calc(-1 * var(--sp-2)); border: 4px solid transparent; border-top-color: var(--fg-faint); border-bottom-width: 0; }
.ws-chip:hover::after { border-top-color: var(--fg-muted); }
.ws-name { color: var(--fg); font-weight: 600; letter-spacing: var(--tracking-tight); flex: none; max-width: 180px; }
.ws-branch {
  display: inline-flex; align-items: center; gap: 5px; min-width: 0; max-width: 220px;
  height: 20px; padding: 0 7px;
  border-radius: var(--r-full);
  border: 1px solid var(--border-strong);
  color: var(--fg-muted);
  font: 500 11px/1 var(--font-mono);
}
.ws-branch svg.i { width: 11px; height: 11px; }

.cmdbar {
  display: flex; align-items: center; gap: var(--sp-4);
  height: 30px; width: 100%; padding: 0 var(--sp-3) 0 var(--sp-5);
  border-radius: var(--r-md);
  border: 1px solid var(--border-strong);
  background: var(--bg-1);
  color: var(--fg-faint); font-size: var(--fs-sm);
  transition: border-color var(--dur-1), background var(--dur-1), color var(--dur-1);
}
.cmdbar:hover { background: var(--bg-2); color: var(--fg-muted); border-color: color-mix(in srgb, var(--border-strong) 100%, var(--fg) 12%); }
.cmdbar .cmdbar-text { flex: 1; text-align: left; }

.pr-chip {
  display: inline-flex; align-items: center; gap: var(--sp-3);
  height: 24px; padding: 0 var(--sp-4);
  border-radius: var(--r-full);
  border: 1px solid var(--border-strong);
  color: var(--fg); font-size: var(--fs-sm); font-weight: 600;
}

/* ---------- body grid ---------- */
.body {
  display: grid;
  grid-template-columns: var(--sb, var(--sidebar-w)) 1px minmax(0, 1fr) 1px var(--ib, var(--inspector-w));
  min-height: 0;
}
/* explicit columns: an overlaid (absolute) sidebar must not shift the others */
.sidebar { grid-column: 1; }
.resizer.sb { grid-column: 2; }
.main { grid-column: 3; }
.resizer.ib { grid-column: 4; }
.inspector { grid-column: 5; }
.app.no-sidebar .body { --sb: 0px; }
.app.no-inspector .body { --ib: 0px; }
.app.no-sidebar .sidebar, .app.no-inspector .inspector { visibility: hidden; }
.app.no-sidebar .resizer.sb, .app.no-inspector .resizer.ib { pointer-events: none; background: transparent; }

/* ---------- sidebar ---------- */
.sidebar, .inspector {
  display: flex; flex-direction: column;
  min-width: 0; min-height: 0;
  background: var(--bg-chrome);
  overflow: hidden;
}
.sb-switch {
  display: flex; align-items: center; gap: 2px; flex: none;
  height: var(--h-bar);
  padding: 0 var(--sp-3);
  border-bottom: 1px solid var(--border);
  container-type: inline-size;
  overflow: hidden;
}
.sw-btn {
  position: relative;
  display: inline-flex; align-items: center; gap: 6px;
  flex: 0 1 auto; min-width: 0;
  height: 28px; padding: 0 var(--sp-4);
  border-radius: var(--r-md);
  color: var(--fg-faint); font-size: var(--fs-sm); font-weight: 500;
  transition: color var(--dur-1), background var(--dur-1);
}
.sw-btn:hover { color: var(--fg); background: var(--hover); }
.sw-btn[aria-selected="true"] { color: var(--fg); background: var(--active); }
/* Below the container threshold only the selected tab shows a label (an affordance so the
   active panel is still legible); it must still truncate rather than push the row past the
   sidebar edge when the sidebar is very narrow. */
.sw-label { display: none; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.sw-btn[aria-selected="true"] .sw-label { display: inline; }
@container (min-width: 340px) { .sw-label { display: inline; } }
.sw-btn .badge { height: 15px; min-width: 15px; padding: 0 4px; font-size: 9.5px; background: var(--active-strong); color: var(--fg-muted); }
.sw-btn[aria-selected="true"] .badge { color: var(--fg); }

.panel { display: flex; flex-direction: column; min-height: 0; flex: 1; }
.panel-head {
  display: flex; align-items: center; gap: var(--sp-3);
  height: 34px; flex: none;
  padding: 0 var(--sp-3) 0 var(--sp-6);
}
.panel-head .label { flex: none; }
.panel-title { color: var(--fg); font-size: var(--fs-sm); font-weight: 600; letter-spacing: var(--tracking-tight); }
.panel-head .panel-sub { color: var(--fg-faint); font-size: var(--fs-sm); }
.panel-actions { margin-left: auto; display: flex; gap: 1px; }
.panel-actions .icon-btn { color: var(--fg-faint); }
.panel-actions .icon-btn:hover { color: var(--fg); }
.panel-body { flex: 1; min-height: 0; overflow-y: auto; overflow-x: hidden; position: relative; }

/* ---------- resizers ---------- */
.resizer { position: relative; background: var(--border); z-index: var(--z-sticky); }
.resizer::before {
  content: ""; position: absolute; top: 0; bottom: 0; left: -4px; right: -4px;
  cursor: col-resize;
}
.resizer::after {
  content: ""; position: absolute; top: 0; bottom: 0; left: -1px; right: -1px;
  background: var(--fg-faint); opacity: 0; transition: opacity var(--dur-2);
}
.resizer:hover::after, .resizer.dragging::after { opacity: 0.7; transition-delay: 150ms; }
body.resizing { cursor: col-resize; user-select: none; }

/* ---------- main ---------- */
.main {
  display: flex; flex-direction: column;
  min-width: 0; min-height: 0;
  background: var(--bg-0);
}
.views { flex: 1; min-height: 0; position: relative; }
.view { position: absolute; inset: 0; display: flex; flex-direction: column; min-height: 0; }

/* tabs */
.tabs {
  display: flex; align-items: stretch;
  height: var(--h-tabs); flex: none;
  background: var(--bg-chrome);
  border-bottom: 1px solid var(--border);
  overflow-x: auto; overflow-y: hidden;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tabs:empty { display: none; }
.tab {
  position: relative;
  display: flex; align-items: center; gap: var(--sp-3);
  max-width: 240px; min-width: 0; flex: none;
  padding: 0 var(--sp-2) 0 var(--sp-5);
  border-right: 1px solid var(--border);
  color: var(--fg-faint); font-size: var(--fs-md);
  cursor: pointer; user-select: none;
  transition: color var(--dur-1), background var(--dur-1);
}
.tab:hover { color: var(--fg-muted); background: color-mix(in srgb, var(--bg-0) 55%, var(--bg-chrome)); }
.tab[aria-selected="true"] {
  color: var(--fg);
  background: var(--bg-0);
  margin-bottom: -1px; /* merge into the editor surface */
}
.tab[aria-selected="true"]::before {
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 1px;
  background: var(--fg); opacity: 0.5;
}
.tab .ficon { color: inherit; opacity: 0.8; }
.tab.preview .tab-name { font-style: italic; }
.tab-name { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tab-dir { color: var(--fg-faint); font-size: var(--fs-sm); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 110px; }
.tab-close {
  display: grid; place-items: center; flex: none;
  width: 22px; height: 22px; border-radius: var(--r-sm);
  color: var(--fg-faint); opacity: 0;
}
.tab:hover .tab-close, .tab[aria-selected="true"] .tab-close, .tab-close:focus-visible { opacity: 1; }
.tab .dot-changed { width: 6px; height: 6px; border-radius: 50%; background: var(--git-modified); flex: none; }
.tab.dragging { opacity: 0.5; }
.tab.drag-over { border-left: 2px solid var(--accent); }

/* breadcrumbs + file meta */
.crumbs {
  display: flex; align-items: center; gap: 1px;
  height: var(--h-crumbs); flex: none;
  padding: 0 var(--sp-4) 0 var(--sp-5);
  background: var(--bg-0);
  color: var(--fg-faint); font-size: var(--fs-sm);
  overflow: hidden; white-space: nowrap;
}
.crumbs:empty { display: none; }
.crumb {
  display: inline-flex; align-items: center; gap: 5px;
  height: 22px; padding: 0 5px; border-radius: var(--r-xs);
  color: var(--fg-muted);
}
.crumb:hover { background: var(--hover); color: var(--fg); }
.crumb.last { color: var(--fg); font-weight: 500; }
.crumbs .sep { color: var(--fg-faint); opacity: 0.6; }
.crumbs .crumb-meta { margin-left: auto; display: flex; align-items: center; gap: var(--sp-5); color: var(--fg-faint); font-size: var(--fs-xs); font-variant-numeric: tabular-nums; }
.crumbs .crumb-meta .seg { margin-left: var(--sp-2); }

/* ---------- inspector ---------- */
.insp-head {
  display: flex; align-items: center; gap: var(--sp-2); flex: none;
  height: var(--h-bar);
  padding: 0 var(--sp-3);
  border-bottom: 1px solid var(--border);
}
.insp-tabs { display: flex; align-items: center; gap: 2px; flex: 1; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.insp-tabs::-webkit-scrollbar { display: none; }
.insp-tab {
  display: inline-flex; align-items: center; gap: 6px; flex: none; white-space: nowrap;
  height: 28px; padding: 0 var(--sp-4);
  border-radius: var(--r-md);
  color: var(--fg-faint); font-size: var(--fs-sm); font-weight: 500;
}
.insp-tab:hover { color: var(--fg); background: var(--hover); }
.insp-tab[aria-selected="true"] { color: var(--fg); background: var(--active); }
.insp-body { flex: 1; min-height: 0; overflow: auto; padding: var(--sp-4) var(--sp-7) var(--sp-8); }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 7px var(--sp-6); font-size: var(--fs-sm); }
.kv dt { color: var(--fg-faint); }
.kv dd { margin: 0; color: var(--fg); min-width: 0; overflow-wrap: anywhere; }
.insp-section { padding: var(--sp-6) 0; border-bottom: 1px solid var(--border); }
.insp-section:last-child { border-bottom: 0; }
.insp-section h3 { margin-bottom: var(--sp-5); }

/* ---------- status bar ---------- */
.statusbar {
  display: flex; align-items: stretch;
  height: var(--h-status);
  padding: 0 var(--sp-3);
  border-top: 1px solid var(--border);
  background: var(--bg-chrome);
  color: var(--fg-faint);
  font-size: var(--fs-xs);
  user-select: none;
  overflow: hidden;
}
.sb-group { display: flex; align-items: stretch; min-width: 0; overflow: hidden; }
/* Narrow windows: the left group gives way (clips) so the two never overlap. */
.sb-group.right { margin-left: auto; flex-shrink: 0; }
.sb-item {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 0 var(--sp-4);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.sb-item svg.i { width: 12px; height: 12px; }
button.sb-item { border-radius: 0; }
button.sb-item:hover { background: var(--hover); color: var(--fg); }
.sb-item .ok { color: var(--ok); }
.conn-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); }
.conn-dot.bad { background: var(--danger); }
.conn-dot.wait { background: var(--warn); animation: pulse 1.2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: 0.35; } }

/* ---------- responsive ---------- */
@media (max-width: 1040px) {
  .topbar { grid-template-columns: auto minmax(220px, 1fr) auto; }
  .ws-branch { display: none; }
}
@media (max-width: 1100px) {
  .app:not(.force-inspector) .body { --ib: 0px; }
  .app:not(.force-inspector) .inspector { visibility: hidden; }
}
@media (max-width: 760px) {
  .topbar { grid-template-columns: auto minmax(0, 1fr) auto; gap: var(--sp-4); }
  .ws-chip, .tb-divider { display: none; }
  .cmdbar .keys { display: none; }
  .body { grid-template-columns: 0 0 minmax(0, 1fr) 0 0; }
  .sidebar {
    position: absolute; z-index: var(--z-panel);
    left: 0; top: var(--h-topbar); bottom: var(--h-status);
    width: min(320px, 86vw);
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
  }
  .app.no-sidebar .sidebar { display: none; }
  .inspector {
    position: absolute; z-index: var(--z-panel);
    right: 0; top: var(--h-topbar); bottom: var(--h-status);
    width: min(360px, 92vw);
    border-left: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
  }
  .app.no-inspector .inspector { display: none; }
  .resizer { display: none; }
}

/* latency HUD (§ 9) */
.hud {
  position: fixed; right: var(--sp-5); bottom: calc(var(--h-status) + var(--sp-5)); z-index: var(--z-toast);
  width: 300px; padding: var(--sp-4) var(--sp-5);
  border-radius: var(--r-md); background: var(--bg-2); box-shadow: var(--shadow-md);
  font: var(--fs-xs)/1.5 var(--font-ui); color: var(--fg-muted);
}
.hud-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--sp-3); }
.hud-title { font-weight: 600; color: var(--fg); letter-spacing: var(--tracking-caps); text-transform: uppercase; font-size: var(--fs-2xs); }
.hud-stats { display: grid; grid-template-columns: auto 1fr; gap: 2px var(--sp-5); margin: 0 0 var(--sp-3); }
.hud-stats dt { color: var(--fg-faint); }
.hud-stats dd { margin: 0; color: var(--fg); font-variant-numeric: tabular-nums; }
.hud .bad { color: var(--warn); }
.hud-reqs { list-style: none; margin: 0; padding: var(--sp-3) 0 0; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 1px; }
.hud-reqs li { display: grid; grid-template-columns: 1fr auto auto; gap: var(--sp-4); font-family: var(--font-mono); }
.hud-reqs .num { text-align: right; min-width: 44px; }

/* vim mode badge (§ 6.18) */
.vim-mode { padding: 0 var(--sp-3); border-radius: var(--r-xs); font: 600 var(--fs-2xs)/16px var(--font-mono); letter-spacing: var(--tracking-caps); color: var(--fg-muted); background: var(--hover); }
.vim-mode.visual { color: var(--fg); background: var(--active-strong); }

/* ---------- public demo ribbon (mock mode with ?demo=1; GitHub Pages) ---------- */
.demo-ribbon {
  position: fixed; left: 50%; bottom: calc(var(--h-status) + 12px); transform: translateX(-50%); z-index: 60;
  display: flex; align-items: center; gap: 10px; max-width: calc(100vw - 32px);
  padding: 8px 8px 8px 14px; border-radius: 999px;
  background: color-mix(in srgb, var(--bg-chrome) 88%, transparent); backdrop-filter: blur(10px);
  border: 1px solid var(--border-strong); box-shadow: var(--shadow-md);
  font-size: var(--fs-sm); color: var(--fg-muted);
}
.demo-ribbon strong { color: var(--fg); }
.demo-dot { width: 8px; height: 8px; border-radius: 50%; flex: none; background: linear-gradient(135deg, #ff8c2e, #f2542d 55%, #c22e3d); box-shadow: 0 0 10px #f2542d; }
.demo-cta { flex: none; padding: 4px 12px; border-radius: 999px; background: var(--accent); color: var(--accent-fg); font-weight: 600; text-decoration: none; }
.demo-cta:hover { background: var(--accent-hover); }
.demo-close { flex: none; width: 24px; height: 24px; border-radius: 50%; color: var(--fg-faint); font-size: 16px; line-height: 1; }
.demo-close:hover { background: var(--hover); color: var(--fg); }
@media (max-width: 760px) { .demo-ribbon { bottom: calc(var(--h-status) + 8px); font-size: var(--fs-xs); } }