#sidebar {
  position: fixed;
  top: var(--topbar-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  max-height: calc(100vh - var(--topbar-height));
  overflow: auto;
  padding: 1rem 0 1.6rem;
  border-right: 1px solid rgba(255, 176, 90, 0.12);
  background:
    linear-gradient(180deg, rgba(255, 176, 90, 0.03), transparent 22%),
    rgba(8, 13, 19, 0.95);
  backdrop-filter: blur(18px);
  box-shadow: 20px 0 60px rgba(0, 0, 0, 0.18);
}

.sidebar-panel-head {
  margin: 0 1rem 0.95rem;
  padding: 1rem;
  border: 1px solid rgba(255, 176, 90, 0.14);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 138, 29, 0.09), rgba(255, 138, 29, 0.02)),
    radial-gradient(circle at top right, rgba(255, 178, 89, 0.14), transparent 48%);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
}

.sidebar-kicker {
  color: var(--ember-2);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.sidebar-title {
  margin-top: 0.42rem;
  color: var(--text-0);
  font-size: 1.05rem;
  letter-spacing: -0.03em;
}

.sidebar-note {
  margin: 0.6rem 0 0;
  color: var(--text-2);
  font-size: 0.82rem;
  line-height: 1.65;
}

.sidebar-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  margin: 0 1rem 1rem;
}

.sidebar-tab {
  padding: 0.55rem 0.66rem;
  border-radius: 10px;
  border: 1px solid rgba(255, 176, 90, 0.08);
  background: rgba(255, 255, 255, 0.025);
  color: var(--text-2);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.64rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.sidebar-tab.is-active {
  color: #120a04;
  border-color: rgba(255, 176, 90, 0.24);
  background: linear-gradient(135deg, var(--ember), var(--ember-2));
}

#sidebar-nav {
  display: grid;
  gap: 0.9rem;
}

.sidebar-group {
  display: grid;
  gap: 0.46rem;
}

.sidebar-group-title {
  color: var(--ember-2);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  padding: 0.4rem 1.2rem 0.1rem;
}

.sidebar-link {
  display: block;
  margin: 0 0.75rem;
  padding: 0.78rem 0.9rem 0.82rem 1rem;
  border-radius: 14px;
  border: 1px solid transparent;
  border-left: 3px solid transparent;
  background: rgba(255, 255, 255, 0.02);
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.sidebar-link:hover,
.sidebar-link:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(255, 171, 86, 0.18);
  border-left-color: rgba(255, 171, 86, 0.42);
  background: linear-gradient(180deg, rgba(255, 138, 29, 0.08), rgba(255, 255, 255, 0.02));
}

.sidebar-link.is-current {
  border-color: rgba(255, 171, 86, 0.22);
  border-left-color: var(--ember);
  background: linear-gradient(180deg, rgba(255, 138, 29, 0.1), rgba(255, 255, 255, 0.02));
}

.sidebar-link-title {
  display: block;
  color: var(--text-0);
  font-size: 0.9rem;
  font-weight: 700;
}

.sidebar-link-hint {
  display: block;
  margin-top: 0.22rem;
  color: var(--text-2);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.64rem;
  line-height: 1.5;
}

.sidebar-link-page {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.5rem;
  padding: 0.18rem 0.5rem;
  border: 1px solid rgba(255, 176, 90, 0.1);
  border-radius: 999px;
  color: var(--text-2);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.58rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

#sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 44;
  background: rgba(5, 8, 12, 0.56);
}

body.nav-open #sidebar {
  transform: translateX(0);
}

body.nav-open #sidebar-backdrop {
  display: block;
}