/* ==========================================================================
   Mobile Side Menu
   Below 900px, .navbar hides .nav-menu (see style.css) — this hamburger
   button + slide-in panel replaces it. The panel is anchored below the
   fixed navbar (top: 72px, matching .navbar's height) so the logo and the
   hamburger/back button in the navbar stay visible and clickable while the
   menu is open.
   ========================================================================== */

.nav-hamburger-btn {
    /* 44x44 minimum tap target (was 40x40) — icon glyph stays the same
       visual size (font-size below unchanged), just a slightly larger box. */
    display: none;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-md);
    background-color: transparent;
    border: 1px solid var(--border-card);
    color: var(--color-text-main);
    font-size: 16px;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}

.nav-hamburger-btn:hover {
    background-color: var(--bg-main-light);
    border-color: var(--color-primary);
}

@media (max-width: 900px) {
    .nav-hamburger-btn {
        display: flex;
    }
}

/* Backdrop behind the open menu — click to close */
.mobile-nav-backdrop {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    height: calc(100% - 72px);
    background-color: var(--black-alpha-50);
    z-index: 998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.mobile-nav-backdrop.mobile-nav-active {
    opacity: 1;
    pointer-events: auto;
}

/* Side Menu Panel */
.mobile-nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    width: 280px;
    max-width: 80vw;
    height: calc(100% - 72px);
    background-color: var(--bg-navbar);
    border-right: 1px solid var(--border-card);
    box-shadow: var(--shadow-premium);
    z-index: 999;
    display: flex;
    flex-direction: column;
    padding: 24px 20px;
    gap: 4px;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    box-sizing: border-box;
}

.mobile-nav-menu.mobile-nav-active {
    transform: translateX(0);
}

.mobile-nav-link {
    color: var(--color-text-muted);
    text-decoration: none;
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    padding: 14px 12px;
    border-radius: var(--border-radius-md);
    transition: all 0.2s ease;
}

.mobile-nav-link:hover,
.mobile-nav-link:active {
    color: var(--color-text-main);
    background-color: var(--bg-main-light);
}

/* Only ever relevant below 900px — .nav-menu already covers wider screens */
@media (min-width: 901px) {

    .mobile-nav-menu,
    .mobile-nav-backdrop {
        display: none;
    }
}