/* ============================================================================
   shell.css — the persistent app frame: sidebar + topbar + main + footer.
   Layout mirrors the reference CRM (fixed sidebar left, topbar across the top,
   scrolling main region, footer). Styling is entirely from design tokens.
   ============================================================================ */

.app {
  --shell-offset: var(--sidebar-width);
  min-height: 100vh;
}
.app.is-collapsed { --shell-offset: var(--sidebar-width-collapsed); }

/* ---- Sidebar ------------------------------------------------------------- */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  background: var(--sidebar);
  color: var(--sidebar-foreground);
  border-right: 1px solid var(--sidebar-border);
  z-index: var(--z-sidebar);
  transition: width var(--transition-base);
}
.app.is-collapsed .sidebar { width: var(--sidebar-width-collapsed); }

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  height: var(--topbar-height);
  padding: 0 var(--space-4);
  border-bottom: 1px solid var(--sidebar-border);
}
.sidebar-brand {
  display: flex;
  align-items: center;
  overflow: hidden;
}
.sidebar-logo { display: block; }
.sidebar-logo-full { height: 30px; width: auto; max-width: 100%; }
.sidebar-logo-mark { height: 34px; width: 34px; }

/* Theme + collapse visibility: light wordmark (light), white wordmark (dark),
   square mark (collapsed rail, either theme). */
.sidebar-logo-light { display: block; }
.sidebar-logo-dark  { display: none; }
.sidebar-logo-mark  { display: none; }
.dark .sidebar-logo-light { display: none; }
.dark .sidebar-logo-dark  { display: block; }
.app.is-collapsed .sidebar-logo-light,
.app.is-collapsed .sidebar-logo-dark { display: none; }
.app.is-collapsed .sidebar-logo-mark { display: block; }

.sidebar-nav {
  flex: 1;
  padding: var(--space-2) var(--space-3) var(--space-4);
}
.sidebar-nav-group { display: flex; flex-direction: column; gap: 2px; }

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--muted-foreground);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.nav-link .icon { width: 1.25rem; height: 1.25rem; }
.nav-link:hover {
  background: var(--sidebar-accent);
  color: var(--sidebar-accent-foreground);
}
.nav-link.active {
  background: var(--primary-tint);
  color: var(--primary);
  font-weight: var(--font-weight-semibold);
}
.nav-link.active::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--space-3));
  top: 20%; bottom: 20%;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--primary);
}
.nav-link .nav-caret { margin-left: auto; transition: transform var(--transition-fast); }
.nav-link[aria-expanded="true"] .nav-caret { transform: rotate(180deg); }
.app.is-collapsed .nav-text,
.app.is-collapsed .nav-caret { display: none; }
.app.is-collapsed .nav-link { justify-content: center; }
.app.is-collapsed .nav-link.active::before { display: none; }

.nav-submenu {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--transition-base);
  margin-left: var(--space-6);
  border-left: 1px solid var(--sidebar-border);
}
.nav-submenu.open { grid-template-rows: 1fr; }
.nav-submenu > ul { overflow: hidden; padding-left: var(--space-2); }
.nav-submenu .nav-link { font-size: var(--text-sm); padding: var(--space-2); }
.app.is-collapsed .nav-submenu { display: none; }

/* ---- Topbar -------------------------------------------------------------- */
.topbar {
  position: fixed;
  top: 0;
  left: var(--shell-offset);
  right: 0;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 0 var(--space-6);
  background: color-mix(in srgb, var(--card) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: var(--z-topbar);
  transition: left var(--transition-base);
}
.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.topbar-right { margin-left: auto; }
.topbar-search {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 260px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--background);
  color: var(--muted-foreground);
}
.topbar-search input {
  border: none;
  background: none;
  outline: none;
  width: 100%;
  color: var(--foreground);
}
.topbar-search input::placeholder { color: var(--muted-foreground); }

.app-title {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--font-weight-semibold);
  color: var(--foreground);
}
.app-title .icon { color: var(--primary); }

/* ---- Main + footer ------------------------------------------------------- */
.main {
  margin-left: var(--shell-offset);
  padding-top: var(--topbar-height);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: margin-left var(--transition-base);
}
.main-inner {
  flex: 1;
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding: var(--space-6);
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--border);
  color: var(--muted-foreground);
  font-size: var(--text-sm);
}
.footer a:hover { color: var(--foreground); }

/* ---- Responsive ---------------------------------------------------------- */
@media (max-width: 992px) {
  .app { --shell-offset: 0px; }
  .sidebar {
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base);
  }
  .app.is-mobile-open .sidebar { transform: translateX(0); }
  .topbar-search { min-width: 0; }
  .app-title { display: none; }
}

/* Backdrop for mobile drawer */
.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgb(15 23 42 / 0.4);
  z-index: calc(var(--z-sidebar) - 1);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}
@media (max-width: 992px) {
  .app.is-mobile-open .sidebar-backdrop { opacity: 1; visibility: visible; }
}