/* Shared navigation and native controls; independent of product-page variables. */
html[data-theme="dark"] { color-scheme: dark; }
html[data-theme="light"] { color-scheme: light; }
.site-skip-link { position: fixed; top: 10px; left: 12px; z-index: 2000; padding: 12px 18px; border-radius: 10px; background: #fff; color: #111827; transform: translateY(-180%); text-decoration: none; }
.site-skip-link:focus { transform: none; outline: 3px solid #0284c7; }
.site-header a:focus-visible, .site-header button:focus-visible,
.site-footer a:focus-visible, .site-footer select:focus-visible,
.home-page a:focus-visible { outline: 3px solid #0284c7; outline-offset: 4px; }
.site-footer #lang-selector { background-color: #fff !important; color: #111827 !important; border-color: #cbd5e1 !important; color-scheme: light; }
.site-footer #lang-selector option { background-color: #fff; color: #111827; }
[data-theme="dark"] .site-footer #lang-selector { background-color: #1e293b !important; color: #f1f5f9 !important; border-color: #475569 !important; color-scheme: dark; }
[data-theme="dark"] .site-footer #lang-selector option { background-color: #1e293b; color: #f1f5f9; }
.site-footer .footer-language-links { display: flex; flex-wrap: wrap; gap: 8px 14px; margin-top: 14px; font-size: .8rem; }
.site-footer .footer-language-links a { color: inherit; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* Shared back-to-top control: below modal layers and independent of page theme variables. */
.site-back-to-top{position:fixed;right:24px;bottom:24px;right:max(24px,env(safe-area-inset-right));bottom:max(24px,env(safe-area-inset-bottom));z-index:1020;display:grid;place-items:center;width:48px;height:48px;padding:0;border:1px solid #cbd5e1;border-radius:15px;background:#fff;color:#334155;box-shadow:0 8px 24px rgba(15,23,42,.18);cursor:pointer;transition:background-color .18s,color .18s,transform .18s;touch-action:manipulation}
.site-back-to-top[hidden]{display:none!important}
.site-back-to-top:hover{background:#075f9b;color:#fff;border-color:#075f9b;transform:translateY(-2px)}
.site-back-to-top:focus-visible{outline:3px solid #0284c7;outline-offset:4px}
[data-theme="dark"] .site-back-to-top{background:#1e293b;color:#f1f5f9;border-color:#475569;box-shadow:0 8px 24px rgba(0,0,0,.3)}
[data-theme="dark"] .site-back-to-top:hover{background:#075f9b;color:#fff;border-color:#38bdf8}
@media(max-width:560px){.site-back-to-top{right:16px;bottom:16px;right:max(16px,env(safe-area-inset-right));bottom:max(16px,env(safe-area-inset-bottom));width:44px;height:44px;border-radius:13px}}
@media(prefers-reduced-motion:reduce){.site-back-to-top{transition:none}.site-back-to-top:hover{transform:none}}