:root {
    --footer-bg: rgba(15, 23, 42, 0.6);
    --footer-border: rgba(148, 163, 184, 0.3);
    --footer-text: #cbd5f5;
    --footer-accent: #38bdf8;
}

footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1.5rem;
    background: var(--footer-bg);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--footer-border);
    font-size: 0.8rem;
    color: var(--footer-text);
    width: 100%;
    margin-top: auto;
    box-sizing: border-box;
    flex-shrink: 0; /* フッターが潰れないように */
}

footer a {
    color: var(--footer-text);
    text-decoration: none;
    transition: color 0.2s;
}

footer a:hover {
    color: var(--footer-accent);
}