.exercises-container {
    display: flex;
    flex-wrap: wrap; /* Allow wrapping for responsiveness */
}

.main-content {
    flex-grow: 1;
    padding: 20px;
    min-width: 0; /* allow inner grids to shrink properly */
}

.side-menu {
    width: 250px; /* A bit wider for better readability */
    flex-shrink: 0;
    background-color: #f8f9fa; /* Lighter background */
    padding: 20px;
    border-right: 1px solid #dee2e6; /* Subtle separator */
}

.side-menu h2 {
    margin-top: 0;
}

.side-menu ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.side-menu li a {
    display: block;
    padding: 10px;
    text-decoration: none;
    color: #333;
}

.side-menu li a.active {
    background-color: #ddd;
    font-weight: bold;
}

/* Responsive: stack side menu and content */
@media (max-width: 900px) {
  .exercises-container { flex-direction: column; }
  .menu-toggle { display: inline-flex; align-items: center; gap: 6px; padding: 8px 12px; margin: 10px 20px; font-size: 16px; }
  .side-menu { display: none; width: 100%; border-right: none; border-bottom: 1px solid #dee2e6; }
  .side-menu.open { display: block; }
}

/* Hide menu toggle on wide screens */
@media (min-width: 901px) {
  .menu-toggle { display: none; }
}

/* Desktop: sidebar vlevo */
.exercises-shell {
  display: flex;
  flex: 1 1 auto;
  min-height: 0;
}

.ex-side-menu {
  width: 260px;
  flex: 0 0 260px;
  padding: 12px;
}

.ex-menu-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.ex-menu-list a {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  text-decoration: none;
}

.ex-menu-list a.menu-active {
  text-decoration: underline;
  font-weight: 700;
}

/* Mobilní combobox defaultně skrytý na desktopu */
.ex-nav-mobile {
  display: none;
  padding: 10px 12px;
}

.ex-nav-select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
}

/* Mobil: sidebar pryč, select viditelný */
@media (max-width: 760px) {
  .ex-side-menu { display: none; }
  .ex-nav-mobile { display: block; }
  .exercises-shell { display: block; } /* aby se obsah nesnažil držet vedle sidebaru */
}