/* ==========================================================================
   Nav Dropdown — Hover-activated pulldown menus for top navigation
   Usage: <div class="z-nav-dropdown">
            <button class="z-nav-trigger">Label ▾</button>
            <div class="z-nav-menu">
              <a href="..." class="z-nav-item">...</a>
              <div class="z-nav-separator">Legacy</div>
              <a href="..." class="z-nav-item">...</a>
            </div>
          </div>
   ========================================================================== */

/* --- Dropdown Container --- */
.z-nav-dropdown {
    position: relative;
}

/* --- Trigger Button (looks like a nav link) --- */
.z-nav-trigger {
    background: none;
    border: none;
    cursor: pointer;
    font-size: inherit;
    font-family: inherit;
    color: var(--z-text-mid);
    padding: 0.25rem 0;
    transition: color 0.15s;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    white-space: nowrap;
}

.z-nav-trigger:hover {
    color: var(--z-text);
}

/* Active state — when a child page is active */
.z-nav-trigger.nav-active {
    border-bottom: 2px solid var(--z-accent);
    color: var(--z-primary);
}

/* Chevron icon */
.z-nav-trigger .z-nav-chevron {
    width: 12px;
    height: 12px;
    transition: transform 0.2s;
    flex-shrink: 0;
}

/* --- Invisible hover bridge (prevents gap between trigger and menu) --- */
.z-nav-dropdown::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 6px;
    display: none;
}

/* --- Dropdown Menu --- */
.z-nav-menu {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    min-width: 200px;
    background: var(--z-bg-card);
    border: 1px solid var(--z-border);
    border-radius: 0.5rem;
    box-shadow: var(--z-shadow-panel);
    padding: 0.375rem 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity 0.15s, transform 0.15s, visibility 0.15s;
    z-index: 100;
}

/* Show on hover */
.z-nav-dropdown:hover::after {
    display: block;
}

.z-nav-dropdown:hover .z-nav-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.z-nav-dropdown:hover .z-nav-chevron {
    transform: rotate(180deg);
}

/* --- Menu Items --- */
.z-nav-item {
    display: block;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    color: var(--z-text-mid);
    text-decoration: none;
    transition: background 0.1s, color 0.1s;
    white-space: nowrap;
}

.z-nav-item:hover {
    background: var(--z-bg-hover);
    color: var(--z-text);
}

/* Active item marker */
.z-nav-item.active {
    color: var(--z-primary);
    font-weight: 500;
    background: var(--z-accent-light);
}

/* --- Legacy Separator (labeled divider) --- */
.z-nav-separator {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--z-text-faint);
    padding: 0.625rem 1rem 0.25rem;
    margin-top: 0.25rem;
    border-top: 1px solid var(--z-border);
}