:root { --sd-header-height: 80px; }
html { scroll-behavior: smooth; }
body { margin: 0; overflow-x: hidden; }
#site-main { margin-top: var(--sd-header-height); position: relative; min-height: calc(100svh - var(--sd-header-height)); }
.sd-site-header { position: fixed; z-index: 100; top: 0; left: 0; width: 100%; height: var(--sd-header-height); background: #fff; padding: 0 30px; display: flex; align-items: center; justify-content: space-between; gap: 30px; box-shadow: 0 1px 2px #0003; font-family: 'Noto Sans JP', sans-serif; }
.sd-site-logo { display: block; flex: 0 0 150px; }
.sd-brand-navigation { display: flex; align-items: center; gap: 40px; }
.sd-site-logo img { display: block; width: 150px; height: auto; }
.sd-site-links { display: flex; align-items: center; gap: 5px; }
.sd-site-links a { color: #0047b4; border: 1px solid #0047b4; border-radius: 24px; min-width: 110px; width: clamp(110px, 8vw, 150px); text-align: center; font-size: 28px; font-weight: 700; line-height: 38px; white-space: nowrap; text-decoration: none; }
.sd-site-links a:hover, .sd-site-links a[aria-current='page'] { border-bottom-width: 4px; line-height: 35px; }
.sd-site-contact { color: white; background: #0047b4; border-radius: 24px; padding: 12px 30px; font-size: 16px; font-weight: 700; letter-spacing: .1em; text-decoration: none; white-space: nowrap; }
.sd-site-contact:hover { transform: scale(1.05); }
.sd-menu-button { display: none; color: #0047b4; background: transparent; border: 0; padding: 10px; cursor: pointer; }
.sd-menu-button svg { width: 32px; height: 32px; }
.sd-menu-dialog { border: 0; border-radius: 32px; padding: 40px 24px; width: min(400px, calc(100vw - 40px)); max-height: calc(100svh - 40px); overflow-y: auto; color: #0047b4; box-shadow: 0 6px 15px #0003; }
.sd-menu-dialog::backdrop { background: #0008; }
.sd-menu-close { position: absolute; top: 16px; right: 20px; background: transparent; border: 0; font-size: 32px; line-height: 1; cursor: pointer; color: #333; }
.sd-menu-links { display: flex; flex-direction: column; align-items: center; }
.sd-menu-links a { font: 700 28px/1.4 Montserrat, sans-serif; padding: 10px; text-decoration: none; color: #0047b4; }
.sd-menu-links .sd-site-contact { color: #fff; font-size: 16px; padding: 12px 30px; margin-top: 20px; }
.sd-menu-links a:hover { text-decoration: underline; }
.sd-skip-link { position: fixed; left: 12px; top: -80px; z-index: 200; background: #0047b4; color: white; padding: 12px; }
.sd-skip-link:focus { top: 12px; }
.sd-site-header a:focus-visible, .sd-menu-button:focus-visible, .sd-menu-dialog a:focus-visible, .sd-menu-close:focus-visible { outline: 3px solid #3b82f6; outline-offset: 4px; }
.sd-hero-section { height: calc(100svh - var(--sd-header-height)); min-height: 560px; }
@media (max-width: 1200px) { .sd-site-links, .sd-site-header > .sd-site-contact { display: none; } .sd-menu-button { display: block; } }
@media (max-width: 768px) { :root { --sd-header-height: 60px; } .sd-site-header { padding: 0 20px; } .sd-site-logo, .sd-site-logo img { width: 140px; flex-basis: 140px; } .sd-hero-section { min-height: 620px; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; } }