:root {
  --sidebar-width: 280px;
}

.sidebar-wrapper {
  position: relative;
  z-index: var(--z-fixed);
}

.sidenav.sidebar-surface {
  background: linear-gradient(180deg, #ffffff 0%, #f5f7fb 100%);
  color: var(--text-primary);
  padding: var(--spacing-xl) var(--spacing-lg);
  box-shadow: 4px 0 24px rgba(15, 23, 42, 0.08), inset -1px 0 0 rgba(148, 163, 184, 0.12);
  border: none;
  border-radius: 0;
  overflow-y: auto;
  height: 100%;
  isolation: isolate;
}

.sidenav.sidebar-surface::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 20% 10%, rgba(11, 60, 137, 0.08) 0%, transparent 55%),
    radial-gradient(circle at 80% 80%, rgba(249, 115, 22, 0.08) 0%, transparent 55%);
  pointer-events: none;
}

.sidenav.sidenav-fixed.sidebar-surface {
  width: var(--sidebar-width);
}

.sidenav.sidebar-surface::-webkit-scrollbar {
  width: 8px;
}

.sidenav.sidebar-surface::-webkit-scrollbar-thumb {
  background: rgba(11, 60, 137, 0.25);
  border-radius: 4px;
  transition: background var(--transition-fast);
}

.sidenav.sidebar-surface::-webkit-scrollbar-thumb:hover {
  background: rgba(11, 60, 137, 0.4);
}

.sidenav.sidebar-surface::-webkit-scrollbar-track {
  background: rgba(148, 163, 184, 0.1);
}

.sidebar-header {
  background: transparent;
  padding: 0;
  margin-bottom: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  border: none;
}

.sidebar-brand {
  width: 100%;
}

.sidebar-brand-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  text-decoration: none;
  color: inherit;
  background: linear-gradient(135deg, rgba(11, 60, 137, 0.08) 0%, rgba(249, 115, 22, 0.05) 100%);
  border: 1px solid rgba(148, 163, 184, 0.18);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.sidebar-brand-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(11, 60, 137, 0.15) 0%, rgba(249, 115, 22, 0.1) 100%);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.sidebar-brand-link:hover,
.sidebar-brand-link:focus {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(15, 23, 42, 0.15), 0 0 0 1px rgba(11, 60, 137, 0.25);
  border-color: rgba(11, 60, 137, 0.25);
  outline: none;
}

.sidebar-brand-link:hover::before,
.sidebar-brand-link:focus::before {
  opacity: 1;
}

.sidebar-logo {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-sm);
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
  box-shadow: 0 10px 20px rgba(11, 60, 137, 0.25);
  position: relative;
  overflow: hidden;
}

.sidebar-logo img {
  width: 32px;
  height: auto;
  display: block;
  transition: transform var(--transition-normal);
  position: relative;
  z-index: 1;
}

.sidebar-brand-link:hover .sidebar-logo img,
.sidebar-brand-link:focus .sidebar-logo img {
  transform: scale(1.08) rotate(-2deg);
}

.sidebar-brand-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
  z-index: 1;
}

.sidebar-brand-title {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--primary-color);
}

.sidebar-brand-subtitle {
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
}

.user-info {
  width: 100%;
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  background: linear-gradient(135deg, rgba(255, 255, 255, 1) 0%, rgba(237, 242, 250, 0.9) 100%);
  border: 1px solid rgba(148, 163, 184, 0.2);
  color: var(--text-primary);
  text-align: left;
  box-shadow: var(--shadow-sm);
}

.user-name {
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 4px;
  font-size: 0.95rem;
  color: var(--primary-color);
}

.user-email {
  font-size: 0.75rem;
  opacity: 0.8;
  word-break: break-word;
  color: var(--text-secondary);
}

.sidebar-separator {
  height: 1px;
  width: 100%;
  margin: var(--spacing-lg) 0;
  background: linear-gradient(90deg, transparent, rgba(148, 163, 184, 0.4), transparent);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.3);
}

.sidenav.sidebar-surface ul {
  list-style: none;
  margin: 0;
  padding-left: 0;
}

.sidenav.sidebar-surface .collapsible {
  border: none;
  box-shadow: none;
  background: transparent;
}

.sidenav.sidebar-surface .collapsible-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-bottom: 4px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 1) 0%, rgba(237, 242, 250, 0.8) 100%);
  border: 1px solid rgba(148, 163, 184, 0.25);
}

.sidenav.sidebar-surface .collapsible-header:hover,
.sidenav.sidebar-surface .collapsible-header:focus {
  background: linear-gradient(135deg, rgba(11, 60, 137, 0.08) 0%, rgba(249, 115, 22, 0.08) 100%);
  border-color: rgba(11, 60, 137, 0.25);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
  outline: none;
}

.sidenav.sidebar-surface .collapsible-header i {
  font-size: 1.4rem;
  opacity: 0.85;
  color: var(--primary-color);
  transition: transform var(--transition-fast);
}

.sidenav.sidebar-surface .collapsible-header:hover i {
  transform: scale(1.1);
  color: var(--secondary-color);
}

.sidenav.sidebar-surface .collapsible-header a {
  flex: 1;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: inherit !important;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

.sidenav.sidebar-surface li.active > .collapsible-header {
  background: linear-gradient(
    135deg,
    rgba(249, 115, 22, 0.95) 0%,
    rgba(251, 155, 60, 1) 75%
  );
  border-color: rgba(243, 83, 15, 0.7);
  box-shadow: 0 6px 20px rgba(243, 83, 15, 0.4);
  color: #fff;
}

.sidenav.sidebar-surface .collapsible-body {
  background: linear-gradient(180deg, rgba(237, 242, 250, 0.65) 0%, rgba(255, 255, 255, 0.85) 100%);
  border-radius: var(--border-radius-sm);
  margin: 4px 0 var(--spacing-md);
  padding: var(--spacing-sm) 0;
  border: 1px solid rgba(148, 163, 184, 0.2);
  box-shadow: inset 0 2px 4px rgba(15, 23, 42, 0.04);
}

.sidenav.sidebar-surface .collapsible-body ul {
  padding: var(--spacing-xs) 0;
}

.sidenav.sidebar-surface .collapsible-body li {
  margin: 2px 0;
}

.sidenav.sidebar-surface .collapsible-body li a {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 11px var(--spacing-md) 11px var(--spacing-xl);
  color: var(--text-secondary) !important;
  font-size: 0.9rem;
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all var(--transition-fast);
  position: relative;
}

.sidenav.sidebar-surface .collapsible-body li a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, #f97316 0%, #ea580c 100%);
  transform: scaleY(0);
  transition: transform var(--transition-fast);
}

.sidenav.sidebar-surface .collapsible-body li a:hover,
.sidenav.sidebar-surface .collapsible-body li a:focus {
  background: rgba(11, 60, 137, 0.12);
  color: var(--primary-color) !important;
  padding-left: calc(var(--spacing-xl) + 6px);
  outline: none;
}

.sidenav.sidebar-surface .collapsible-body li a:hover::before,
.sidenav.sidebar-surface .collapsible-body li a:focus::before {
  transform: scaleY(1);
}

.sidenav.sidebar-surface .collapsible-body li.active > a,
.sidenav.sidebar-surface .collapsible-body li a[aria-current="page"] {
  background: linear-gradient(
    90deg,
    rgba(249, 115, 22, 0.95) 0%,
    rgba(249, 115, 22, 0.95) 40%,
    rgba(251, 155, 60, 0.9) 100%
  );
  color: #fff !important;
  font-weight: 600;
  border-left-color: rgba(249, 115, 22, 0.8);
  box-shadow: inset 0 0 0 1px rgba(249, 115, 22, 0.6);
}

.sidenav.sidebar-surface .collapsible-body li.active > a::before,
.sidenav.sidebar-surface .collapsible-body li a[aria-current="page"]::before {
  transform: scaleY(1);
}

.sidenav.sidebar-surface .divider {
  background-color: rgba(148, 163, 184, 0.35);
  height: 1px;
  margin: 6px 0;
}

.sidenav.sidebar-surface .collapsible-body form {
  padding: var(--spacing-md);
}

.sidenav.sidebar-surface .collapsible-body form .btn {
  width: 100%;
}

@media screen and (max-width: 1200px) {
  .sidenav.sidebar-surface {
    padding: var(--spacing-xl) var(--spacing-md);
  }
}

@media screen and (max-width: 992px) {
  .sidenav.sidebar-surface {
    border-radius: 0;
    box-shadow: none;
    border: none;
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.95);
  }

  .sidebar-separator {
    margin-top: var(--spacing-md);
  }

  .user-info {
    background: linear-gradient(135deg, rgba(255, 255, 255, 1) 0%, rgba(237, 242, 250, 0.9) 100%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .sidebar-brand-link,
  .sidenav.sidebar-surface .collapsible-header,
  .sidenav.sidebar-surface .collapsible-body li a {
    transition: none !important;
    transform: none !important;
  }
}