.sidebar {
  width: 280px;
  flex-shrink: 0;
  padding: 1.539rem 2.5rem 2.1546rem;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--bg-base, transparent);
  transition:
    width var(--panel-enter, 420ms cubic-bezier(0.22, 1, 0.36, 1)),
    padding var(--panel-enter, 420ms cubic-bezier(0.22, 1, 0.36, 1)),
    opacity var(--panel-enter, 420ms cubic-bezier(0.22, 1, 0.36, 1));
  overflow: hidden;
  white-space: nowrap;
  z-index: 50;
}

body.panel-fullscreen-mode .sidebar,
body.is-focus-mode .sidebar {
  width: 0;
  padding-left: 0;
  padding-right: 0;
  opacity: 0;
  border-right-color: transparent;
  pointer-events: none;
}

.sidebar .brand-container {
  text-align: center;
  margin-bottom: 1.539rem;
  position: relative;
}

.sidebar .brand-container::after {
  content: "";
  position: absolute;
  bottom: -0.9234rem;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 20.01px;
  background: var(--text-ghost);
}

.sidebar .brand {
  font-family: var(--serif, "Playfair Display", Georgia, serif);
  font-size: 2.2rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-main);
  line-height: 1;
  margin-bottom: 0.8rem;
  display: block;
  text-decoration: none;
  padding-left: 0.2em;
}

.sidebar .brand-subtitle {
  font-family: var(--sans, "Outfit", system-ui, sans-serif);
  font-size: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.4em;
  color: var(--text-muted);
  font-weight: 300;
}

.sidebar .nav-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  flex: 1;
  margin-top: 0.6156rem;
}

.sidebar .nav-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.115425rem;
  padding: 0.7695rem 0;
  border-bottom: 1px solid var(--rule, var(--border));
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
}

.sidebar .nav-item:last-child {
  border-bottom: none;
}

.sidebar .nav-num {
  font-family: var(--sans, "Outfit", system-ui, sans-serif);
  font-size: 0.5rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--text-ghost);
  transition: color 0.6s;
  text-transform: uppercase;
}

.sidebar .nav-text {
  font-family: var(--serif, "Playfair Display", Georgia, serif);
  font-size: 1.8rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  transition: all 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  transform-origin: left;
}

.sidebar .nav-item:hover .nav-text {
  color: var(--text-main);
  font-style: italic;
  transform: translateX(6px);
}

.sidebar .nav-item:hover .nav-num {
  color: var(--text-main);
}

.sidebar .nav-item.active {
  border-bottom-color: var(--text-main);
}

.sidebar .nav-item.active .nav-text {
  color: var(--text-main);
  font-style: italic;
  transform: translateX(6px);
}

.sidebar .nav-item.active .nav-num {
  color: var(--text-main);
}

.sidebar .nav-item.active::after {
  content: "✦";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.5rem;
  color: var(--text-main);
}

.sidebar .nav-footer {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--rule, var(--border));
  padding-top: 0.654075rem;
}

.sidebar .theme-toggle,
.sidebar .nav-logout {
  background: transparent;
  border: none;
  text-align: left;
  cursor: pointer;
  color: var(--text-muted);
  font-family: var(--sans, "Outfit", system-ui, sans-serif);
  font-size: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 300;
  transition: color 0.4s;
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  text-decoration: none;
  padding: 0.8rem 0;
}

.sidebar .theme-toggle:hover,
.sidebar .nav-logout:hover {
  color: var(--text-main);
}

.sidebar .theme-toggle::after {
  content: "◐";
  font-size: 0.9rem;
  font-weight: normal;
  font-family: var(--serif, "Playfair Display", Georgia, serif);
}

@media (max-width: 920px) {
  body.has-mobile-nav .sidebar {
    display: none !important;
  }
}