.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 260px;
  height: 100vh;
  background: rgba(10, 15, 30, 0.92);
  border-right: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  padding: 0 0 24px;
  z-index: 100;
  overflow-y: auto;
}

.sidebar__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--border-soft);
}

.sidebar__brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-inverse);
  flex-shrink: 0;
}

.sidebar__brand-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.sidebar__brand-subtitle {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 2px;
}

.sidebar__nav {
  flex: 1;
  padding: 16px 12px 0;
  overflow-y: auto;
}

.sidebar__group {
  margin-bottom: 12px;
}

.sidebar__group--static {
  margin-bottom: 20px;
}

.sidebar__group-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 8px 10px;
  color: var(--text-tertiary);
  transition: background 0.18s, color 0.18s, border-color 0.18s;
}

.sidebar__group-toggle:hover {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
  border-color: var(--border-soft);
}

.sidebar__group-title {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.sidebar__group-arrow {
  font-size: 14px;
  line-height: 1;
  color: var(--text-tertiary);
  transition: transform 0.18s ease, color 0.18s ease;
}

.sidebar__group--open .sidebar__group-arrow {
  transform: rotate(0deg);
}

.sidebar__group--collapsed .sidebar__group-arrow {
  transform: rotate(-90deg);
}

.sidebar__group-content {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-top: 6px;
  overflow: hidden;
}

.sidebar__group--collapsed .sidebar__group-content {
  display: none;
}

.sidebar__group-content--open {
  padding-top: 0;
}

.sidebar__item {
  display: block;
  padding: 9px 10px;
  border-radius: 10px;
  font-size: 14px;
  color: var(--text-secondary);
  transition: background 0.18s, color 0.18s;
  cursor: pointer;
  margin-bottom: 2px;
}

.sidebar__item:hover {
  background: rgba(77, 163, 255, 0.08);
  color: var(--text-primary);
}

.sidebar__item--active {
  background: rgba(51, 230, 255, 0.12);
  color: var(--text-primary);
  position: relative;
  font-weight: 500;
}

.sidebar__item--active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20%;
  height: 60%;
  width: 3px;
  background: var(--brand-cyan);
  border-radius: 0 2px 2px 0;
}