/* ============================================
   MUHSEN CRM — Layout (Sidebar + Topbar + Shell)
   ============================================ */

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr;
  grid-template-areas:
    "sidebar topbar"
    "sidebar main";
  min-height: 100vh;
  transition: grid-template-columns var(--dur-base) var(--ease-out);
}
.app-shell[data-sidebar="collapsed"] {
  grid-template-columns: var(--sidebar-w-collapsed) 1fr;
}

/* ===== Sidebar ===== */
.sidebar {
  grid-area: sidebar;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  padding: var(--space-4) var(--space-3);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: var(--z-sticky);
}

.sidebar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-2);
  margin-bottom: var(--space-4);
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-md);
  min-height: 56px;
}
.sidebar__brand-logo {
  height: 38px;
  width: auto;
  max-width: 180px;
  display: block;
  object-fit: contain;
  flex-shrink: 0;
}
.sidebar__brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: none;
  object-fit: contain;
  flex-shrink: 0;
}
.sidebar__brand-tag {
  font-size: 10px;
  color: var(--text-tertiary);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: var(--fw-semibold);
  padding: 3px 8px;
  background: var(--bg-subtle);
  border-radius: var(--radius-pill);
  margin-left: auto;
  flex-shrink: 0;
}

/* Collapsed sidebar: show square icon, hide wordmark + tag */
.app-shell[data-sidebar="collapsed"] .sidebar__brand-logo,
.app-shell[data-sidebar="collapsed"] .sidebar__brand-tag {
  display: none;
}
.app-shell[data-sidebar="collapsed"] .sidebar__brand-icon {
  display: block;
}
.app-shell[data-sidebar="collapsed"] .sidebar__brand {
  justify-content: center;
}

.sidebar__section-label {
  font-size: var(--fs-xxs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  padding: var(--space-3) var(--space-3) var(--space-1);
  font-weight: var(--fw-semibold);
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 9px 12px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: var(--fs-md);
  font-weight: var(--fw-medium);
  cursor: pointer;
  text-decoration: none;
  position: relative;
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
  white-space: nowrap;
  overflow: hidden;
}
.nav-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.nav-item[aria-current="page"] {
  background: var(--bg-sidebar-active);
  color: var(--teal-700);
  font-weight: var(--fw-semibold);
}
.nav-item[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--primary);
}
.nav-item__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  font-size: 18px;
  color: currentColor;
}
.nav-item__badge {
  margin-left: auto;
  background: var(--accent-500);
  color: white;
  font-size: var(--fs-xxs);
  font-weight: var(--fw-bold);
  padding: 2px 7px;
  border-radius: var(--radius-pill);
  line-height: 1.4;
}

/* AI nav item: subtle teal→orange brand gradient */
.nav-item--ai {
  background: linear-gradient(135deg, rgba(0, 130, 153, 0.07) 0%, rgba(236, 122, 37, 0.07) 100%);
  border: 1px solid rgba(236, 122, 37, 0.20);
  margin-bottom: 8px;
  position: relative;
}
.nav-item--ai .nav-item__icon {
  color: var(--accent-500);
}
.nav-item--ai:hover {
  background: linear-gradient(135deg, rgba(0, 130, 153, 0.12) 0%, rgba(236, 122, 37, 0.12) 100%);
}
.nav-item--ai[aria-current="page"] {
  background: linear-gradient(135deg, rgba(0, 130, 153, 0.18) 0%, rgba(236, 122, 37, 0.18) 100%);
  color: var(--teal-800);
}
.nav-item--ai[aria-current="page"]::before {
  background: linear-gradient(180deg, var(--teal-500), var(--accent-500));
}

.sidebar__footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-3);
  margin-top: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sidebar__footer .nav-item {
  /* Settings inside footer keeps same look as nav-items */
  margin-bottom: 4px;
}

.sidebar__collapse-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  transition: background var(--dur-fast) var(--ease-out);
}
.sidebar__collapse-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.sidebar__user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out);
}
.sidebar__user:hover { background: var(--bg-hover); }
.sidebar__user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-500);
  color: #FFFFFF;
  display: grid;
  place-items: center;
  font-weight: var(--fw-bold);
  font-size: 13px;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
.sidebar__user-info {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex: 1;
  min-width: 0;
}
.sidebar__user-name {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sidebar__user-role {
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
  white-space: nowrap;
}

/* Collapsed sidebar */
.app-shell[data-sidebar="collapsed"] .sidebar__brand-text,
.app-shell[data-sidebar="collapsed"] .nav-item span:not(.nav-item__icon):not(.nav-item__badge),
.app-shell[data-sidebar="collapsed"] .sidebar__section-label,
.app-shell[data-sidebar="collapsed"] .sidebar__user-info {
  display: none;
}
.app-shell[data-sidebar="collapsed"] .nav-item {
  justify-content: center;
  padding: 11px 0;
}
.app-shell[data-sidebar="collapsed"] .nav-item__badge {
  position: absolute;
  top: 4px;
  right: 6px;
  margin: 0;
  min-width: 0;
  padding: 2px 5px;
}
.app-shell[data-sidebar="collapsed"] .sidebar__brand { justify-content: center; }
.app-shell[data-sidebar="collapsed"] .sidebar__user { justify-content: center; }

/* ===== Topbar ===== */
.topbar {
  grid-area: topbar;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 0 var(--space-6);
  position: sticky;
  top: 0;
  z-index: calc(var(--z-sticky) - 1);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-md);
  color: var(--text-tertiary);
  font-weight: var(--fw-medium);
}
.breadcrumb__sep { color: var(--neutral-300); }
.breadcrumb__current { color: var(--text-primary); font-weight: var(--fw-semibold); }

.global-search {
  flex: 1;
  max-width: 480px;
  margin: 0 auto;
  position: relative;
}
.global-search input {
  width: 100%;
  background: var(--bg-subtle);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: 8px 12px 8px 36px;
  font-size: var(--fs-md);
  transition: all var(--dur-fast) var(--ease-out);
}
.global-search input:focus {
  background: var(--bg-surface);
  border-color: var(--border-focus);
  box-shadow: var(--shadow-focus);
  outline: none;
}
.global-search__icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
  font-size: 16px;
}
.global-search__shortcut {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-size: var(--fs-xxs);
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  pointer-events: none;
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.topbar__icon-btn {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 18px;
  position: relative;
  transition: all var(--dur-fast) var(--ease-out);
}
.topbar__icon-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.topbar__icon-btn .dot {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 8px;
  height: 8px;
  background: var(--accent-500);
  border-radius: 50%;
  border: 2px solid var(--bg-surface);
}

/* ===== Main content ===== */
.main {
  grid-area: main;
  padding: var(--space-6) var(--space-8);
  overflow-y: auto;
  background: var(--bg-app);
}
.main__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.page-header__left {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.page-header__title {
  font-size: var(--fs-3xl);
  font-weight: var(--fw-bold);
  letter-spacing: -0.022em;
  color: var(--text-primary);
}
.page-header__sub {
  color: var(--text-secondary);
  font-size: var(--fs-md);
}
.page-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Tabs */
.tabs {
  display: flex;
  gap: var(--space-1);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0;
  margin-bottom: var(--space-2);
}
.tab {
  padding: 10px 16px;
  color: var(--text-secondary);
  font-size: var(--fs-md);
  font-weight: var(--fw-medium);
  border-bottom: 2px solid transparent;
  transition: all var(--dur-fast) var(--ease-out);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.tab:hover { color: var(--text-primary); }
.tab[aria-selected="true"] {
  color: var(--teal-700);
  border-bottom-color: var(--primary);
  font-weight: var(--fw-semibold);
}
.tab__count {
  background: var(--bg-muted);
  color: var(--text-tertiary);
  font-size: var(--fs-xxs);
  font-weight: var(--fw-semibold);
  padding: 1px 7px;
  border-radius: var(--radius-pill);
}
.tab[aria-selected="true"] .tab__count {
  background: var(--primary-soft);
  color: var(--teal-700);
}

/* Responsive — narrow tablets/phones get a hamburger */
@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-areas: "topbar" "main";
  }
  .sidebar {
    position: fixed;
    left: 0; top: 0;
    transform: translateX(-100%);
    transition: transform var(--dur-base) var(--ease-out);
    box-shadow: var(--shadow-xl);
  }
  .app-shell[data-mobile-nav="open"] .sidebar { transform: translateX(0); }
  .main { padding: var(--space-4); }
  .global-search { max-width: none; }
}