#site-header {
    width: 100%;
    position: sticky;
    top: 0;
    z-index: 100;
    background: #003366;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-img {
    height: 32px;
    width: auto;
}

.logo-mark {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: rgba(255,255,255,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 500;
    color: #fff;
}

.logo-mark-img {
    height: 32px;
    width: auto;
}

.logo-name {
    font-size: 18px;
    font-weight: 500;
    color: #fff;
    letter-spacing: 0.5px;
}

.navbar { display: flex; align-items: center; }

.nav-links {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0;
    margin: 0;
}

.nav-links li a {
    display: block;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    font-size: 14px;
    padding: 6px 14px;
    border-radius: 6px;
    transition: background 0.2s, color 0.2s;
}

.nav-links li a:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
}

.nav-links li.active a {
    background: rgba(255,255,255,0.2);
    color: #fff;
    font-weight: 500;
}

.nav-links li.nav-cta a {
    background: rgba(255,255,255,0.1);
    border: 0.5px solid rgba(255,255,255,0.3);
    color: #fff;
    margin-left: 8px;
}

.nav-links li.nav-cta a:hover {
    background: rgba(255,255,255,0.25);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 6px;
    border: none;
    background: transparent;
}

.hamburger span {
    display: block;
    width: 22px;
    height: 1.5px;
    background: #fff;
    border-radius: 2px;
}

@media (max-width: 600px) {
    .hamburger {
         display: flex;
         touch-action: manipulation;
     }
    
    .navbar {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        
        /* 左右にpaddingをつけることで、中の文字が端にくっつくのを防ぐ */
        padding: 0.5rem 1.5rem 1rem 1.5rem;
        
        background: #003366;
        box-sizing: border-box;
    }
    
    .navbar.open { display: block; }
    
    /* 他のスタイルはそのまま維持 */
    .nav-links { 
        flex-direction: column; 
        align-items: stretch; 
        gap: 2px; 
    }
}