/* ============================================================
   GadgetCity Todo — Layout (Sidebar, Topbar, Content)
   ============================================================ */

/* ── App Layout ── */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* ── Sidebar ── */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--color-white);
  border-right: 1px solid var(--color-gray-200);
  display: flex;
  flex-direction: column;
  z-index: var(--z-sticky);
  transition: transform var(--transition-slow);
  overflow-y: auto;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--color-gray-100);
}

.sidebar-logo {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.sidebar-brand {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  letter-spacing: -0.02em;
}

.sidebar-brand span {
  color: var(--color-primary);
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-4) var(--space-3);
}

.sidebar-section-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-2) var(--space-3);
  margin-top: var(--space-4);
}

.sidebar-section-title:first-child {
  margin-top: 0;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-lg);
  color: var(--color-gray-600);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  cursor: pointer;
  margin-bottom: 2px;
  text-decoration: none;
}

.nav-item:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-900);
}

.nav-item.active {
  background: var(--color-primary-50);
  color: var(--color-primary);
}

.nav-item .nav-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  opacity: 0.7;
}

.nav-item.active .nav-icon {
  opacity: 1;
}

.nav-item .nav-badge {
  margin-left: auto;
  background: var(--color-danger);
  color: white;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  padding: 1px 7px;
  border-radius: var(--radius-full);
  min-width: 20px;
  text-align: center;
}

.sidebar-footer {
  padding: var(--space-4) var(--space-3);
  border-top: 1px solid var(--color-gray-100);
}

/* ── Topbar ── */
.topbar {
  position: sticky;
  top: 0;
  height: var(--topbar-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  z-index: var(--z-sticky);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.topbar-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-900);
}

.hamburger-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  align-items: center;
  justify-content: center;
  color: var(--color-gray-600);
  transition: all var(--transition-fast);
}

.hamburger-btn:hover {
  background: var(--color-gray-100);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.topbar-search {
  position: relative;
}

.topbar-search input {
  width: 240px;
  height: 38px;
  padding: 0 var(--space-4) 0 38px;
  background: var(--color-gray-100);
  border-radius: var(--radius-full);
  color: var(--color-gray-800);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.topbar-search input::placeholder {
  color: var(--color-gray-400);
}

.topbar-search input:focus {
  background: var(--color-white);
  box-shadow: 0 0 0 2px var(--color-primary-200);
  width: 300px;
}

.topbar-search .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--color-gray-400);
  pointer-events: none;
}

.topbar-icon-btn {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray-500);
  transition: all var(--transition-fast);
}

.topbar-icon-btn:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-700);
}

.topbar-icon-btn .notification-dot {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 8px;
  height: 8px;
  background: var(--color-danger);
  border-radius: 50%;
  border: 2px solid var(--color-white);
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2) var(--space-1) var(--space-1);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.topbar-user:hover {
  background: var(--color-gray-100);
}

.topbar-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary-200), var(--color-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  overflow: hidden;
}

.topbar-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.topbar-username {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
}

/* ── User Dropdown ── */
.user-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  width: 200px;
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-gray-200);
  padding: var(--space-2);
  z-index: var(--z-dropdown);
  animation: scaleIn var(--transition-fast) ease-out;
  display: none;
}

.user-dropdown.open {
  display: block;
}

.user-dropdown .dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-dropdown .dropdown-item:hover {
  background: var(--color-gray-100);
  color: var(--color-gray-900);
}

.user-dropdown .dropdown-item.danger {
  color: var(--color-danger);
}

.user-dropdown .dropdown-item.danger:hover {
  background: var(--color-danger-light);
}

.user-dropdown .dropdown-divider {
  height: 1px;
  background: var(--color-gray-100);
  margin: var(--space-2) 0;
}

/* ── Main Content ── */
.main-wrapper {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  padding: var(--space-6);
  max-width: var(--content-max-width);
  width: 100%;
  margin: 0 auto;
}

/* ── Sidebar Overlay (Mobile) ── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: calc(var(--z-sticky) - 1);
  backdrop-filter: blur(2px);
}

.sidebar-overlay.active {
  display: block;
  animation: fadeIn var(--transition-fast) ease-out;
}