:root {
    --accent: #4ade80;
}

.accent-bg { background-color: var(--accent); }
.accent-text { color: var(--accent); }
.accent-border { border-color: var(--accent); }

/* Burger Icon */
.burger {
    position: relative;
    width: 26px;
    height: 18px;
    display: inline-block;
}

.burger .line {
    position: absolute;
    left: 0; right: 0;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: transform .2s ease, opacity .2s ease;
}

.burger .line-1 { top: 0; }
.burger .line-2 { top: 8px; }
.burger .line-3 { bottom: 0; }

#mobile-menu-button[aria-expanded="true"] .line-1 {
    transform: translateY(8px) rotate(45deg);
}
#mobile-menu-button[aria-expanded="true"] .line-2 {
    opacity: 0;
}
#mobile-menu-button[aria-expanded="true"] .line-3 {
    transform: translateY(-8px) rotate(-45deg);
}