/* Sidebar top row: theme toggle + mobile hamburger (always visible, no scrolling required) */
.sidebar-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Vertical nav inside the sidebar (desktop) */
nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.6rem 0.9rem;
    border-radius: 10px;
    transition: all 0.25s ease;
    font-size: 0.92rem;
    display: block;
}

nav a:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.theme-toggle,
.header-btn {
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.25s ease;
    text-decoration: none;
    font-size: 0.95rem;
}

.theme-toggle:hover,
.header-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    color: var(--primary);
}

/* Hamburger Menu Button */
.hamburger-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 150;
}

.hamburger-btn span {
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.hamburger-btn.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Footer (sits at the bottom of the scrollable content column) */
footer {
    padding: 2rem 0 0;
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-copy {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-socials {
    display: flex;
    gap: 0.6rem;
}