/* ===============================================
   SUBMENU STYLES - Desktop & Mobile
   Hierarchical menu system with expand/collapse
   =============================================== */

/* Base submenu styles */
.has-submenu {
  position: relative;
}

.submenu-toggle {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 14px 16px;
  border: none;
  border-radius: 14px;
  background: transparent;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: inherit;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: left;
}

.submenu-toggle:hover {
  background: var(--glass);
  color: var(--accent);
}

.submenu-toggle .ico {
  width: 24px;
  height: 24px;
  min-width: 24px;
  flex-shrink: 0;
  opacity: 0.8;
  filter: var(--icon-filter);
}

.submenu-toggle:hover .ico {
  opacity: 1;
  transform: scale(1.1);
}

.submenu-toggle .chevron {
  margin-left: auto;
  transition: transform 0.3s ease;
  opacity: 0.7;
}

.submenu-toggle[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

/* Submenu container */
.submenu {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.3s ease;
  opacity: 0;
}

.has-submenu.expanded .submenu {
  max-height: 1000px; /* Large enough for content */
  opacity: 1;
}

/* First level submenu items */
.submenu > li {
  margin: 0;
  padding-left: 16px;
}

.submenu > li > a,
.submenu > li > button.submenu-toggle {
  padding: 12px 16px;
  font-size: 0.95em;
  font-weight: 500;
}

/* Second level submenu (Database) */
.submenu .has-submenu {
  margin-top: 4px;
}

.submenu .has-submenu .submenu-toggle {
  padding: 10px 14px;
  font-size: 0.9em;
}

.submenu .has-submenu .submenu-toggle .ico {
  width: 20px;
  height: 20px;
  min-width: 20px;
}

.submenu .has-submenu .submenu-toggle .chevron {
  width: 14px;
  height: 14px;
}

/* Third level submenu items (Database tables) */
.submenu .submenu {
  padding-left: 12px;
  background: var(--panel-darker, rgba(0, 0, 0, 0.2));
  border-left: 2px solid var(--border);
  margin-left: 8px;
  margin-top: 4px;
  border-radius: 8px;
}

.submenu .submenu > li {
  padding-left: 8px;
}

.submenu .submenu > li > a {
  padding: 10px 12px;
  font-size: 0.85em;
  font-weight: 400;
  display: flex;
  align-items: center;
  gap: 10px;
}

.submenu .submenu > li > a:hover {
  background: var(--glass);
  color: var(--accent);
  padding-left: 16px;
}

/* Active state for current page */
.submenu a.active,
.submenu .submenu a.active {
  background: var(--accent-bg, rgba(59, 130, 246, 0.1));
  color: var(--accent);
  border-left: 3px solid var(--accent);
  padding-left: 13px;
}

/* Desktop specific adjustments */
html.is-desktop .nav-list .has-submenu {
  margin-bottom: 8px;
}

html.is-desktop .submenu {
  margin-top: 4px;
  padding: 4px 0;
}

/* Mobile specific adjustments */
html.is-mobile #mobile-menu .has-submenu {
  margin-bottom: 6px;
}

html.is-mobile #mobile-menu .submenu {
  margin-top: 4px;
  padding: 6px 0;
}

/* Animation for smooth expand/collapse */
@keyframes expandMenu {
  from {
    max-height: 0;
    opacity: 0;
  }
  to {
    max-height: 1000px;
    opacity: 1;
  }
}

@keyframes collapseMenu {
  from {
    max-height: 1000px;
    opacity: 1;
  }
  to {
    max-height: 0;
    opacity: 0;
  }
}

/* Ensure proper z-index stacking */
.has-submenu {
  z-index: 1;
}

.has-submenu.expanded {
  z-index: 2;
}

/* Improve touch targets on mobile */
@media (max-width: 767px) {
  .submenu-toggle {
    min-height: 48px;
  }
  
  .submenu a {
    min-height: 44px;
  }
}

/* Dark mode adjustments */
@media (prefers-color-scheme: dark) {
  .submenu .submenu {
    background: rgba(0, 0, 0, 0.4);
  }
}

/* Light mode adjustments */
@media (prefers-color-scheme: light) {
  .submenu .submenu {
    background: rgba(0, 0, 0, 0.05);
  }
}