:root {
    --color-primary: #0a0a0a;
    --color-secondary: #2563eb;
    --color-accent: #00e5ff;
    --color-surface: #fafafa;
    --color-text: #0a0a0a;
    --color-text-muted: #666;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0.5rem 1.5rem 0.5rem;
}

.logo {
    width: 300px;
    height: auto;
}

/* ハンバーガーメニュー共通スタイル */
#menuBtn span {
    transform-origin: center;
}

.menu-open span:nth-child(1) {
    transform: rotate(45deg);
    top: 50%;
}

.menu-open span:nth-child(2) {
    opacity: 0;
}

.menu-open span:nth-child(3) {
    transform: rotate(-45deg);
    top: 50%;
}
.hamburger {
    background-color: #e8f0fe;
}
.hamburger .items a {
    color: #64748b;
    padding-top: 12px;
    padding-bottom: 12px;
}
.hamburger .items a:hover {
    color: #2563eb;
}

/* =========================================
Footer
========================================= */
.footer {
    background-color: #3d3d40;
    color: #89898b;
    padding: 1rem;
}

.footer .footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer a:hover {
    color: white;
}

.footer-copyright {
    font-size: 12px;
    margin-top: 20px;
    justify-content: center;
    text-align: center;
}