/* ── Sidebar (frosted glass panel) ───────────────── */
#sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--glass);
  backdrop-filter: blur(var(--blur)) saturate(1.5);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(1.5);
  border-right: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

/* Animated gradient accent strip */
#sidebar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg,
      var(--accent) 0%,
      var(--teal) 35%,
      var(--pink) 65%,
      var(--purple) 100%);
  opacity: 0.5;
  background-size: 100% 200%;
  animation: gradientShift 8s ease-in-out infinite alternate;
}

@keyframes gradientShift {
  0% {
    background-position: 0% 0%;
    opacity: 0.4;
  }

  100% {
    background-position: 0% 100%;
    opacity: 0.7;
  }
}

/* ── Sidebar header ───────────────── */
#sidebar-header {
  padding: 18px 18px 16px 20px;
  border-bottom: 1px solid var(--glass-border);
  flex-shrink: 0;
  position: relative;
}

/* Glass highlight on header */
#sidebar-header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-highlight), transparent);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.logo-mark {
  width: 30px;
  height: 30px;
  background: linear-gradient(135deg, var(--accent), #b8e63c);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 12px var(--accent-glow), inset 0 1px 0 rgba(255, 255, 255, 0.2);
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s;
}

.logo-mark:hover {
  transform: scale(1.08) rotate(-3deg);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.logo-mark svg {
  width: 13px;
  height: 13px;
}

.logo h1 {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.4px;
  color: var(--text);
  font-family: 'Geist Mono', monospace;
}

.logo p {
  font-size: 9px;
  color: var(--text-3);
  font-family: 'Geist Mono', monospace;
  letter-spacing: 0.3px;
  margin-top: 1px;
}

/* ── Scrollable controls area ───────────────── */
#controls-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 8px 10px 20px;
}

#controls-scroll::-webkit-scrollbar {
  width: 3px;
}

#controls-scroll::-webkit-scrollbar-track {
  background: transparent;
}

#controls-scroll::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 2px;
}

#controls-scroll::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.14);
}