.sf {
  --sf-line: rgba(255, 255, 255, .08); --sf-link: #A3B3C6; --sf-muted: #7A8DA3; --sf-hi: #FFFFFF; --sf-acc: #58A6FF;
  --sf-btn: #0E1628; --sf-btn-edge: rgba(88, 166, 255, .22);
  margin: 8px 0 0; padding: 20px 0 calc(96px + env(safe-area-inset-bottom)); border-top: 1px solid var(--sf-line);
  font-size: 14px; line-height: 1.45; color: var(--sf-link);
}
.sf *, .sf *::before, .sf *::after { box-sizing: border-box; }
.sf p { margin: 0; }
.sf [hidden] { display: none !important; }
.sf a:focus-visible, .sf button:focus-visible { outline: 2px solid var(--sf-acc); outline-offset: 2px; }
.sf > .sf-static { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.sf > .sf-static a { display: inline-flex; align-items: center; min-height: 40px; color: var(--sf-link); text-decoration: underline; text-underline-offset: 3px; }

.sf-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 24px; }
.sf-docs { display: flex; flex-wrap: wrap; gap: 0 22px; min-width: 0; }
.sf-link { display: inline-flex; align-items: center; min-height: 40px; color: var(--sf-link); transition: color .15s ease; }
.sf-link:hover { color: var(--sf-hi); text-decoration: underline; text-underline-offset: 3px; }

.sf-acts { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.sf-btn { display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 0 14px; background: var(--sf-btn); border: 1px solid var(--sf-btn-edge);
  color: var(--sf-hi); font-weight: 600; transition: border-color .15s ease; }
.sf-btn:hover { border-color: var(--sf-acc); }
body .sf .sf-btn.sf-btn-quiet { background: transparent; border-color: transparent; box-shadow: none; color: var(--sf-link); }
body .sf .sf-btn.sf-btn-quiet:hover { color: var(--sf-hi); border-color: transparent; box-shadow: none; }
.sf-ico { width: 16px; height: 16px; fill: currentColor; }
.sf-lang { display: inline-flex; margin-left: 4px; border: 1px solid var(--sf-line); }
.sf-lang-btn { min-width: 44px; min-height: 38px; padding: 0 10px; background: transparent; border: 0; color: var(--sf-muted); font-weight: 700; font-size: 13px; cursor: pointer; }
.sf-lang-btn:hover { color: var(--sf-hi); }
.sf-lang-btn.is-on { background: var(--sf-btn); color: var(--sf-hi); box-shadow: inset 0 -2px 0 var(--sf-acc); cursor: default; }

.sf-fine { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 20px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--sf-line);
  font-size: 12px; color: var(--sf-muted); }
.sf .sf-fine p:not(.sf-code), .sf .sf-fine p:not(.sf-code) * { font-family: 'Segoe UI', system-ui, -apple-system, Roboto, Arial, sans-serif !important; }
.sf-age b { display: inline-block; margin-right: 6px; padding: 0 5px; border: 1px solid currentColor; font-weight: 800; color: var(--sf-link); }
.sf .sf-code { flex: 0 0 auto; margin-left: auto; padding: 2px 8px; border: 1px dashed var(--sf-btn-edge); color: var(--sf-link); opacity: 1;
  font-size: 12px; font-family: 'DM Mono', monospace !important; letter-spacing: .06em; }

@media (max-width: 680px) {
  .sf { padding-top: 16px; }
  .sf-row { flex-direction: column; align-items: stretch; gap: 12px; }
  .sf-docs { gap: 0 18px; }
  .sf-link { min-height: 44px; }
  .sf-btn, .sf-lang-btn { min-height: 44px; }
  .sf-fine { flex-direction: column; align-items: flex-start; }
  .sf .sf-code { margin-left: 0; }
}

body.season-halloween .sf { --sf-line: #2A2338; --sf-link: #CFC6E0; --sf-muted: #A29ABB; --sf-hi: #F6EEDB; --sf-acc: #FFA048; --sf-btn: #1F1A2A; --sf-btn-edge: #3A3150; }
body.season-halloween .sf-btn { border: 2px solid #120E1C; box-shadow: inset 0 2px 0 #3A3150, inset 0 -2px 0 #15111E; }
body.season-halloween .sf-btn:hover { box-shadow: inset 0 2px 0 #FFA048, inset 0 -2px 0 #15111E; }
body.season-halloween .sf-lang { border: 2px solid #120E1C; }

@media (prefers-reduced-motion: reduce) { .sf-link, .sf-btn { transition: none; } }