.site-menu {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 10;
    display: flex;
    flex-direction: column;
    width: 33.333vw;
    height: calc(100vh - 2rem);
    padding: 1.25rem;
    box-sizing: border-box;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 1rem;
    backdrop-filter: blur(0);
    pointer-events: none;
    transition: background 0.25s ease, border-color 0.25s ease, backdrop-filter 0.25s ease;
}

.site-menu.is-open {
    background: rgba(210, 210, 210, 0.45);
    border-color: rgba(0, 0, 0, 0.12);
    backdrop-filter: blur(8px);
    pointer-events: auto;
}

.menu-toggle {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    pointer-events: auto;
}

.menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background: #1a1a1a;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.menu-nav {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1.5rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.site-menu.is-open .menu-nav {
    opacity: 1;
    visibility: visible;
}

.menu-nav a {
    color: #1a1a1a;
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 1.25rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    text-decoration: none;
}

.menu-nav a:hover {
    opacity: 0.6;
}