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

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background-color: #000;
    color: #fff;
    z-index: 1000;
    font-family: system-ui, -apple-system, sans-serif;
}

.header-container {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-title {
    font-size: 1.6rem;
    font-weight: bold;
    letter-spacing: 1px;
}

.main-nav .nav-list {
    list-style: none;
    display: flex;
    gap: 2.5rem;
}

.main-nav a {
    color: #fff;
    text-decoration: none;
    font-size: 1.05rem;
    transition: color 0.2s;
}

.main-nav a:hover {
    color: #ccc;
}

/* ハンバーガー */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 32px;
    height: 22px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1100;
}

.hamburger span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: white;
    transition: all 0.3s;
}

/* モバイルメニュー */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: rgba(0, 0, 0, 0.98);
    color: white;
    transition: right 0.4s ease;
    padding-top: 80px;
    z-index: 900;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-title {
    font-size: 1.8rem;
    font-weight: bold;
    padding: 0 1.5rem 2rem;
    border-bottom: 1px solid #333;
    margin-bottom: 1.5rem;
}

.mobile-menu ul {
    list-style: none;
}

.mobile-menu a {
    display: block;
    padding: 1.2rem 1.5rem;
    color: white;
    text-decoration: none;
    font-size: 1.2rem;
}

.mobile-menu a:hover {
    background-color: #222;
}


@media (max-width: 768px) {
    .main-nav {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .header-container {
        justify-content: space-between;
    }
}