/* ============================================
   SIDE-NAV — Fixed section navigation
   Hover-to-open. Starts closed with a > tab.
   Scoped entirely under .side-nav* to avoid
   conflicts with existing components.
   ============================================ */

/* ---------- Container ---------- */
.side-nav {
    position: fixed;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    z-index: 999;
    display: flex;
    align-items: center;
}

/* ---------- Arrow tab (visible when closed) ---------- */
.side-nav__tab {
    background: var(--dark-muted, #1e293b);
    color: var(--primary, #10b981);
    border: 2px solid var(--primary, #10b981);
    border-left: none;
    border-radius: 0 var(--radius-md, 8px) var(--radius-md, 8px) 0;
    width: 28px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    flex-shrink: 0;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    opacity: 1;
    transform: translateX(0);
    transition: opacity 0.25s ease, transform 0.3s ease;
    position: relative;
    z-index: 1;
}

/* ---------- Link panel (hidden by default) ---------- */
.side-nav__links {
    background: var(--dark-muted, #1e293b);
    border-right: 3px solid var(--primary, #10b981);
    border-radius: 0 var(--radius-md, 8px) var(--radius-md, 8px) 0;
    padding: 12px 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
    max-height: 70vh;
    overflow-y: auto;
    box-shadow: 2px 0 12px rgba(0, 0, 0, 0.25);
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) translateX(-100%);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

/* ---------- Hover state: show links, hide tab ---------- */
.side-nav:hover .side-nav__links {
    transform: translateY(-50%) translateX(0);
    opacity: 1;
    pointer-events: auto;
}

.side-nav:hover .side-nav__tab {
    opacity: 0;
    transform: translateX(-100%);
    pointer-events: none;
}

/* ---------- Section heading ---------- */
.side-nav__heading {
    display: block;
    padding: 8px 20px 10px;
    font-size: var(--font-size-xs, 0.75rem);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary, #10b981);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    margin-bottom: 4px;
    white-space: nowrap;
}

/* ---------- Individual links ---------- */
.side-nav__link {
    display: block;
    padding: 8px 20px;
    font-size: var(--font-size-sm, 0.85rem);
    font-weight: 600;
    color: var(--light, #f8fafc);
    text-decoration: none;
    white-space: nowrap;
    transition: background 0.2s, color 0.2s, padding-left 0.2s;
    border-left: 3px solid transparent;
}

.side-nav__link:hover {
    background: rgba(16, 185, 129, 0.12);
    color: var(--primary, #10b981);
    padding-left: 24px;
    border-left-color: var(--primary, #10b981);
}

.side-nav__link--active {
    background: rgba(16, 185, 129, 0.18);
    color: var(--primary, #10b981);
    border-left-color: var(--primary, #10b981);
}

/* ---------- Responsive ---------- */
@media (max-width: 1023px) {
    .side-nav__links {
        max-height: 60vh;
    }
}

/* Mobile — hide entirely; mobile sidebar in nav_main.html handles nav */
@media (max-width: 768px) {
    .side-nav {
        display: none !important;
    }
}

/* ---------- Scrollbar styling ---------- */
.side-nav__links::-webkit-scrollbar {
    width: 4px;
}

.side-nav__links::-webkit-scrollbar-track {
    background: transparent;
}

.side-nav__links::-webkit-scrollbar-thumb {
    background: var(--primary, #10b981);
    border-radius: 2px;
}