@media (min-width: 761px) {
  .sidebar {
    overflow: hidden;
    transition: width .22s ease, padding .22s ease, border-color .22s ease;
  }

  .sidebar > * {
    min-width: 190px;
    transition: opacity .14s ease;
  }

  .sidebar-toggle {
    position: fixed;
    top: 18px;
    left: 198px;
    z-index: 66;
    display: grid;
    place-items: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: rgba(255,255,255,.94);
    color: var(--ink);
    box-shadow: 0 8px 22px rgba(28,43,75,.12);
    transition: left .22s ease, transform .16s ease, background .16s ease;
  }

  .sidebar-toggle:hover { transform: scale(1.04); background: var(--surface); }
  .sidebar-toggle span::before { content: '‹'; display: block; font-size: 25px; line-height: 1; transform: translateY(-1px); }

  .app.sidebar-collapsed .sidebar {
    width: 0;
    padding-left: 0;
    padding-right: 0;
    border-right-color: transparent;
  }

  .app.sidebar-collapsed .sidebar > * {
    opacity: 0;
    pointer-events: none;
  }

  .app.sidebar-collapsed .sidebar-toggle { left: 14px; }
  .app.sidebar-collapsed .sidebar-toggle span::before { content: '›'; }

  body.modo-cerebro .sidebar-toggle {
    background: rgba(8,11,22,.94);
    border-color: #1d2b4a;
    color: #cfe0ff;
    box-shadow: 0 8px 24px rgba(0,0,0,.34);
  }

  body.modo-cerebro .sidebar-toggle:hover { background: #0d1526; }
  body.modo-cerebro .app.sidebar-collapsed .main { padding-left: 18px; padding-right: 18px; }
}

@media (max-width: 760px) {
  .sidebar-toggle { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .sidebar,
  .sidebar > *,
  .sidebar-toggle { transition: none !important; }
}