/* Header actions and return navigation */
.header-actions{display:flex;align-items:center;gap:9px;margin-left:auto}
.nav-action.nav-support{background:var(--red);color:#fff;text-decoration:none;box-shadow:0 8px 18px #bd0e0233}
.nav-action.nav-support:hover{background:var(--red-light)}
.back-to-top{position:fixed;right:24px;bottom:24px;z-index:15;display:grid;place-items:center;width:44px;height:44px;padding:0;border:1px solid #5c9abb;border-radius:50%;background:#0d2c42eF;color:#b9eafa;box-shadow:0 12px 28px #0008;cursor:pointer;font:700 24px/1 Inter,ui-sans-serif,system-ui;opacity:0;transform:translateY(12px);transition:opacity .2s ease,transform .2s ease,background .2s ease;pointer-events:none}
.back-to-top.visible{opacity:1;transform:translateY(0);pointer-events:auto}
.back-to-top:hover{background:#174b6b;color:#fff}
.back-to-top:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
@media(max-width:900px){.header-actions{gap:7px}}
@media(max-width:620px){.header-actions{margin-left:0}.site-header{flex-wrap:wrap;gap:12px}.back-to-top{right:16px;bottom:16px;width:40px;height:40px}}