/* ─── Hamburger ─── */
.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: background 0.15s;
  flex-shrink: 0;
}
.hamburger-btn:hover { background: var(--secondary); }
.hamburger-btn span {
  display: block;
  width: 22px;
  height: 2.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s;
}
/* ─── Sidebar ─── */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.sidebar-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 280px;
  max-width: 85vw;
  background: var(--surface);
  border-right: 1px solid var(--border);
  z-index: 999;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
  box-shadow: 4px 0 20px rgba(0,0,0,0.1);
}
.sidebar.open { transform: translateX(0); }

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}
.sidebar-logo-img { height: 32px; }
.sidebar-logo-dark { display: none; }
[data-theme="dark"] .sidebar-logo-light { display: none; }
[data-theme="dark"] .sidebar-logo-dark { display: inline-block; }
.sidebar-close {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: 6px;
  transition: background 0.15s;
}
.sidebar-close:hover { background: var(--secondary); }

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem 0;
}
.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}
.sidebar-link:hover { background: var(--secondary); color: var(--primary); }
.sidebar-link.active { background: var(--secondary); color: var(--primary); font-weight: 600; }

.sidebar-footer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-muted);
}