/* Shell layout — three-pane IM workbench
   .app-shell → nav-rail (72px) | conv-col (300px, optional) | main (flex)
*/

.app-shell {
  display: flex;
  height: 100vh;
  width: 100%;
  min-width: 1260px;
  background: var(--bg-page);
  color: var(--text-body);
  overflow: hidden;
}

/* === NAV RAIL (72px) === */
.nav-rail {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: linear-gradient(180deg, #F8FAFC 0%, #EFF6FF 100%);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 0 12px;
  gap: 4px;
}
.nav-avatar {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, #60A5FA, var(--primary));
  color: #fff;
  font-weight: 800;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 6px;
  cursor: pointer;
  user-select: none;
}
.nav-search {
  width: 52px;
  height: 28px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  display: grid;
  place-items: center;
  color: var(--text-muted);
  font-size: 11px;
  margin-bottom: 8px;
  cursor: pointer;
}
.nav-search:hover { border-color: var(--primary); color: var(--primary); }
.nav-item {
  width: 52px;
  padding: 8px 4px;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  color: var(--text-muted);
  font-size: 10px;
  cursor: pointer;
  text-align: center;
  line-height: 1.2;
  background: transparent;
  border: none;
  transition: background 120ms, color 120ms;
}
.nav-item svg { width: 20px; height: 20px; opacity: 0.75; }
.nav-item:hover { color: var(--primary); }
.nav-item:hover svg { opacity: 1; }
.nav-item.is-active {
  background: #fff;
  color: var(--primary);
  box-shadow: var(--shadow-card);
}
.nav-item.is-active svg { opacity: 1; stroke: var(--primary); }
.nav-item.is-placeholder { opacity: 0.55; }
.nav-item.is-placeholder:hover { opacity: 0.85; }
.nav-divider {
  width: 36px;
  height: 1px;
  background: var(--border);
  margin: 6px 0;
  flex-shrink: 0;
}
.nav-spacer { flex: 1; }
.nav-badge { position: relative; }
.nav-badge-dot {
  position: absolute;
  top: -2px;
  right: 6px;
  background: #EF4444;
  color: #fff;
  font-size: 9px;
  font-weight: 700;
  min-width: 14px;
  height: 14px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  padding: 0 4px;
}

/* === CONVERSATION COLUMN (300px, optional) === */
.conv-col {
  width: var(--list-w);
  flex-shrink: 0;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}
.conv-col[hidden],
.conv-col.is-hidden { display: none; }

.conv-head {
  padding: 14px 14px 12px;
  font-weight: 700;
  font-size: 15px;
  color: var(--text-strong);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.conv-head-actions { display: flex; align-items: center; gap: 4px; }
.conv-head-btn {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  color: var(--text-muted);
}
.conv-head-btn:hover { background: var(--primary-soft); color: var(--primary); }
.conv-list { flex: 1; overflow-y: auto; }
.conv-row {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-soft);
  cursor: pointer;
  display: flex;
  gap: 10px;
  align-items: flex-start;
  transition: background 80ms;
}
.conv-row:hover { background: var(--bg-subtle); }
.conv-row.is-active {
  background: var(--primary-soft);
  border-left: 3px solid var(--primary);
  padding-left: 11px;
}
.conv-av {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  flex-shrink: 0;
  background: #DBEAFE;
  color: var(--primary);
  font-weight: 800;
  font-size: 13px;
  display: grid;
  place-items: center;
  text-transform: uppercase;
}
.conv-av-bot { background: linear-gradient(135deg, #93C5FD, var(--primary)); color: #fff; }
.conv-av-system { background: var(--bg-subtle); color: var(--text-muted); }
.conv-meta { flex: 1; min-width: 0; }
.conv-title {
  font-weight: 700;
  color: var(--text-strong);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.conv-title-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 0 1 auto;
  min-width: 0;
}
.conv-tag {
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 600;
  flex-shrink: 0;
}
.conv-tag-official { background: var(--primary-soft); color: var(--primary); border: 1px solid #BFDBFE; }
.conv-tag-bot { background: #F0F9FF; color: #0369A1; border: 1px solid #BAE6FD; }
.conv-tag-task { background: #FEF3C7; color: #B45309; border: 1px solid #FDE68A; }
.conv-tag-system { background: var(--bg-subtle); color: var(--text-muted); border: 1px solid var(--border); }
.conv-tag-group { background: #ECFDF5; color: #047857; border: 1px solid #A7F3D0; }
.conv-snippet {
  color: var(--text-muted);
  font-size: 12px;
  margin-top: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.conv-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  flex-shrink: 0;
}
.conv-date { color: #94A3B8; font-size: 11px; }
.conv-unread {
  background: #EF4444;
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  min-width: 18px;
  height: 18px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  padding: 0 5px;
  box-shadow: 0 2px 6px rgba(239, 68, 68, 0.25);
}
.conv-row-del {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  display: grid;
  place-items: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity 120ms, background 120ms, color 120ms;
}
.conv-row:hover .conv-row-del { opacity: 1; }
.conv-row-del:hover { background: #FEE2E2; color: #DC2626; }

/* === MAIN AREA === */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg-panel);
  position: relative;
}
.main-top {
  height: var(--maintop-h);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 12px;
  background: linear-gradient(180deg, #fff, #F8FAFC);
  flex-shrink: 0;
}
.main-top h1,
.main-top-title {
  margin: 0;
  font-size: 15px;
  font-weight: 800;
  color: var(--text-strong);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.main-tools {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}
.tool-icn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 9px;
  border: none;
  background: transparent;
  border-radius: 8px;
  color: var(--text-muted);
  cursor: pointer;
  font: inherit;
}
.tool-icn:hover { background: var(--primary-soft); color: var(--primary); }
.tool-icn svg { width: 18px; height: 18px; flex-shrink: 0; stroke: currentColor; fill: none; }
.tool-icn .tool-num { font-size: 12px; font-weight: 800; color: var(--text-strong); letter-spacing: -0.02em; }
.tool-icn:hover .tool-num { color: var(--primary); }

.main-body {
  flex: 1;
  min-height: 0;
  overflow: auto;
  display: flex;
  flex-direction: column;
}

/* Legacy alias — older screens still pass children to AppShell and expect
   a generic content container. Keep `.app-main` matching `.main-body`. */
.app-main { flex: 1; min-width: 0; display: flex; flex-direction: column; background: var(--bg-panel); overflow: hidden; }

/* === SCREEN HEADER (used inline by some screens — kept) === */
.screen-header {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--pad-3) var(--pad-4);
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  gap: var(--pad-3);
}
.screen-header-left { display: flex; align-items: center; gap: var(--pad-3); flex: 1; min-width: 0; }
.screen-header-right { display: flex; align-items: center; gap: var(--pad-2); }
.screen-title {
  font-size: var(--t-xl);
  font-weight: 700;
  color: var(--text-strong);
  letter-spacing: -0.01em;
}
.screen-subtitle {
  font-size: var(--t-sm);
  color: var(--text-muted);
}
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--t-sm);
  color: var(--text-muted);
}
.breadcrumbs strong { color: var(--text-strong); font-weight: 600; }

/* === TABS (chip-style, matching prototype's main-top tab chips) === */
.tab-row {
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  padding: 10px var(--pad-4);
  flex-wrap: wrap;
}
.tab-item {
  height: 28px;
  padding: 0 12px;
  font-size: var(--t-sm);
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: background 120ms, color 120ms, border-color 120ms;
}
.tab-item:hover { color: var(--primary); border-color: #BFDBFE; }
.tab-item.is-active {
  color: var(--primary);
  background: var(--primary-soft);
  border-color: #BFDBFE;
  font-weight: 600;
}
.tab-count {
  font-family: var(--font-data);
  font-size: 10px;
  background: var(--bg-panel);
  color: var(--text-muted);
  padding: 1px 5px;
  border-radius: 8px;
}

/* === DATA TABLES === */
.dtable {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--t-md);
}
.dtable th {
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-align: left;
  font-weight: 600;
  padding: 8px var(--pad-3);
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}
.dtable th.num { text-align: right; }
.dtable td {
  padding: 8px var(--pad-3);
  border-bottom: 1px solid var(--border-soft);
  height: var(--row-h);
  color: var(--text-body);
}
.dtable td.num { text-align: right; font-family: var(--font-data); }
.dtable tbody tr:hover { background: var(--bg-subtle); }
.dtable tbody tr.is-selected { background: var(--primary-soft); }

/* Generic flex helpers */
.row { display: flex; align-items: center; gap: var(--pad-2); }
.col { display: flex; flex-direction: column; }
.spacer { flex: 1; }

/* Empty state */
.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--pad-5);
  color: var(--text-muted);
  text-align: center;
  gap: var(--pad-2);
}
.empty-title { font-size: var(--t-lg); color: var(--text-body); font-weight: 600; }

/* Side drawer (right slide-in for member/bot panels) */
.drawer-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(30, 58, 95, 0.14);
  z-index: 30;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease;
}
.drawer-backdrop.is-open { opacity: 1; pointer-events: auto; }
.side-drawer {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(380px, 44vw);
  background: #fff;
  border-left: 1px solid var(--border);
  box-shadow: -12px 0 40px rgba(15, 23, 42, 0.1);
  z-index: 40;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.side-drawer.is-open { transform: translateX(0); }
.side-drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.side-drawer-head h2 { margin: 0; font-size: 15px; font-weight: 800; color: var(--text-strong); }
.drawer-close {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-size: 20px;
  display: grid;
  place-items: center;
  cursor: pointer;
}
.drawer-close:hover { background: var(--border); color: var(--text-strong); }
.side-drawer-body { flex: 1; overflow-y: auto; min-height: 0; }