/* ============================================================
   ADMIN LAYOUT - Sidebar + Header + Content Grid
   ============================================================ */

/* --- Sidebar --- */
.admin-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: linear-gradient(180deg, #002e82 0%, #00164c 100%);
  color: var(--color-white);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  transition: transform var(--transition-slow);
  overflow-y: auto;
}

.sidebar-logo {
  padding: 28px 20px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.sidebar-logo::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 20px;
  right: 20px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.12) 30%, rgba(255,255,255,0.12) 70%, transparent);
}
.sidebar-logo img {
  height: 80px;
  width: auto;
  filter: drop-shadow(0 1px 8px rgba(255,255,255,0.06));
  /* Using native white PNG logo - no filter needed beyond subtle glow */
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-4) var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sidebar-nav .nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 10px 14px;
  color: rgba(255,255,255,0.65);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
  text-decoration: none;
}
.sidebar-nav .nav-link i {
  font-size: 1.1rem;
  width: 22px;
  text-align: center;
  transition: color var(--transition-fast), transform var(--transition-fast);
}
.sidebar-nav .nav-link:hover {
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.9);
}
.sidebar-nav .nav-link:hover i {
  color: rgba(255, 255, 255, 0.95);
  transform: scale(1.1);
}
.sidebar-nav .nav-link.active {
  background: rgba(255,255,255,0.12);
  color: var(--color-white);
  border-left: 3px solid var(--color-primary-400);
  padding-left: 11px;
}

.sidebar-section-label {
  padding: var(--space-4) 14px var(--space-2);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.35);
  font-weight: 600;
}

.sidebar-footer {
  padding: var(--space-4) var(--space-3);
  border-top: 1px solid rgba(255,255,255,0.08);
}
.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 14px;
  margin-bottom: var(--space-2);
}
.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-primary-500);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-white);
  flex-shrink: 0;
}
.sidebar-user span {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.8);
}
.sidebar-footer .nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 10px 14px;
  color: rgba(255,255,255,0.5);
  font-size: var(--font-size-sm);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}
.sidebar-footer .nav-link:hover {
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.8);
}

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

/* --- Header --- */
.admin-header {
  position: sticky;
  top: 0;
  height: var(--header-height);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  display: flex;
  align-items: center;
  padding: 0 var(--space-8);
  gap: var(--space-4);
  z-index: 500;
}
.sidebar-toggle {
  display: none;
  border: none;
  background: none;
  font-size: 1.5rem;
  color: var(--color-gray-600);
  cursor: pointer;
  padding: var(--space-2);
  margin-left: calc(var(--space-2) * -1);
}
.page-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-gray-800);
  margin: 0;
  flex: 1;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.header-search {
  position: relative;
  display: flex;
  align-items: center;
}
.header-search i {
  position: absolute;
  left: 12px;
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
}
.header-search input {
  padding: 7px 12px 7px 34px;
  border: 1px solid var(--color-gray-200);
  border-radius: 20px;
  font-size: var(--font-size-sm);
  font-family: var(--font-family);
  background: var(--color-gray-50);
  color: var(--color-gray-700);
  width: 200px;
  transition: all var(--transition-fast);
}
.header-search input:focus {
  outline: none;
  border-color: var(--color-primary-300);
  background: var(--color-white);
  width: 260px;
  box-shadow: 0 0 0 3px rgba(0, 53, 148, 0.1);
}
.header-notification {
  position: relative;
  border: none;
  background: none;
  font-size: 1.25rem;
  color: var(--color-gray-500);
  cursor: pointer;
  padding: var(--space-2);
  transition: color var(--transition-fast);
}
.header-notification:hover {
  color: var(--color-gray-700);
}
.notif-dot {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-danger);
  border: 2px solid var(--color-white);
}
.header-user-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--color-primary-100);
  color: var(--color-primary-700);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  font-weight: 700;
  cursor: pointer;
}
.header-date {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  white-space: nowrap;
}

/* --- Content Area --- */
.admin-content {
  flex: 1;
  padding: var(--space-8);
  background: var(--color-gray-50);
}
.admin-content > * {
  animation: fadeSlideUp 0.3s ease-out;
}

/* --- Sidebar Overlay (mobile) --- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 999;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .admin-sidebar {
    transform: translateX(-100%);
  }
  .admin-main {
    margin-left: 0;
  }
  .sidebar-toggle {
    display: block;
  }
  .admin-content {
    padding: var(--space-6);
  }
  .header-search {
    display: none;
  }

  body.sidebar-open .admin-sidebar {
    transform: translateX(0);
  }
  body.sidebar-open .sidebar-overlay {
    display: block;
    opacity: 1;
  }
}

@media (max-width: 768px) {
  .admin-content {
    padding: var(--space-4);
  }
  .admin-header {
    padding: 0 var(--space-4);
  }
  .page-title {
    font-size: var(--font-size-lg);
  }
}

/* --- Grid Helpers for Admin Pages --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}
.charts-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}
.three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

@media (max-width: 1024px) {
  .charts-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; }
  .three-col { grid-template-columns: 1fr; }
}