/* Security, FAQ, Switching and 404 pages. Loaded after styles.css (and graphics.css where a page has graphics).
   Same rules as the rest of the site: one accent, gradients only where they mean something, full borders only. */

/* ---- figures ---- */
.sec-hero-fig { padding-top: 0; }
.gfx-xl { padding: 1.4rem 1.6rem 1.2rem; }
.sec-banner { aspect-ratio: 360 / 190; }
.sec-layers .uc-ico { margin-bottom: 1.1rem; }
.sec-ceiling .ticks { margin-top: 1.2rem; }
.sec-ceiling .svc-note a { white-space: nowrap; }
@media (max-width: 48rem) { .gfx-xl { padding: 1rem 0.9rem; } }

/* ---- FAQ ---- */
.faq-layout { display: grid; grid-template-columns: minmax(0, 14rem) minmax(0, 1fr); gap: 3.5rem; align-items: start; }
.faq-toc { position: sticky; top: 5.5rem; display: grid; gap: 0.2rem; }
.faq-toc p { margin-bottom: 0.6rem; }
.faq-toc a { display: block; padding: 0.45rem 0.8rem; border: 1px solid transparent; border-radius: 10px; font-size: 0.92rem; font-weight: 550; color: var(--text-3); transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease; }
.faq-toc a:hover { color: var(--text); border-color: var(--hair); background: var(--surface); text-decoration: none; }
.faq-group + .faq-group { margin-top: 3.5rem; }
.faq-group h2 { margin: 0 0 1.2rem; font-size: clamp(1.4rem, 2.6vw, 1.75rem); }
.faq-list { display: grid; gap: 0.7rem; }
.faq-item { border: 1px solid var(--hair); border-radius: 14px; background: var(--surface); transition: border-color 0.25s ease, background 0.25s ease; }
.faq-item:hover { border-color: var(--hair-strong); }
.faq-item[open] { border-color: var(--hair-strong); background: var(--surface-2); }
.faq-item summary { display: flex; align-items: center; justify-content: space-between; gap: 1.2rem; padding: 1.1rem 1.3rem; cursor: pointer; list-style: none;
  font-size: 1rem; font-weight: 600; line-height: 1.45; color: var(--text); border-radius: 14px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: ""; flex: none; width: 0.55rem; height: 0.55rem; margin-right: 0.2rem; border: solid var(--text-3); border-width: 0 1.5px 1.5px 0;
  transform: translateY(-0.15rem) rotate(45deg); transition: transform 0.25s ease, border-color 0.25s ease; }
.faq-item[open] summary::after { transform: translateY(0.1rem) rotate(225deg); border-color: var(--accent-hi); }
.faq-item summary:focus-visible { outline-offset: -2px; }
.faq-a { padding: 0 1.3rem 1.25rem; }
.faq-a p { font-size: 0.96rem; line-height: 1.7; color: var(--text-2); }
.faq-a p + p { margin-top: 0.7rem; }
.faq-a a { text-decoration: underline; text-underline-offset: 3px; }
.faq-more { margin-top: 4rem; }
@media (max-width: 62rem) {
  .faq-layout { grid-template-columns: 1fr; gap: 2rem; }
  .faq-toc { position: static; display: flex; flex-wrap: wrap; gap: 0.4rem; }
  .faq-toc p { flex-basis: 100%; margin-bottom: 0.2rem; }
  .faq-toc a { border-color: var(--hair-strong); border-radius: 999px; padding: 0.4rem 0.85rem; font-size: 0.86rem; }
}
@media (max-width: 48rem) { .faq-item summary { padding: 1rem 1.05rem; font-size: 0.97rem; } .faq-a { padding: 0 1.05rem 1.1rem; } }
@media (prefers-reduced-motion: reduce) { .faq-item, .faq-item summary::after, .faq-toc a { transition: none; } }

/* ---- Switching guide ---- */
.sw-list { display: grid; gap: 0.9rem; max-width: 54rem; }
.sw-list .card { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 1.4rem; align-items: start; }
.sw-list .num { margin: 0.05rem 0 0; }
.sw-list p { margin-top: 0.45rem; }
.sw-list strong { color: var(--text); font-weight: 600; }
.sw-list code { font-size: 0.82em; }
@media (max-width: 30rem) { .sw-list .card { grid-template-columns: 1fr; gap: 0.2rem; } }

/* ---- 404 ---- */
.nf { padding: 10rem 0 6rem; text-align: center; }
.nf h1 { margin-inline: auto; max-width: 18ch; }
.nf .lead { margin-inline: auto; }
.nf-code { font: 600 0.82rem/1 var(--mono); letter-spacing: 0.14em; color: var(--accent-hi); }
.nf-links { margin: 3rem auto 0; max-width: 46rem; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; text-align: left; }
.nf-links .card { display: block; color: inherit; }
.nf-links .card:hover { text-decoration: none; }
.nf-links .card h2 { margin: 0; font-size: 1.02rem; letter-spacing: -0.01em; }
@media (max-width: 48rem) { .nf { padding: 7.5rem 0 4.5rem; } .nf-links { grid-template-columns: 1fr; } }
.faq-section { padding-top: 1.5rem; }