/* Shared site header and footer. Loaded after each page's own styles, so these rules
 * win. Breakpoints for showing and hiding the bar belong to mobile-nav.js. */
header.site { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.8); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border, #e5e5e5); }
header.site .wrap { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 24px; height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 9px; }
.brand-icon { display: block; width: 26px; height: 26px; }
.brand .word { color: var(--ink, #0a0a0a); font-size: 17px; font-weight: 600; letter-spacing: -0.02em; }

.nav-links { display: flex; flex: 1 1 auto; justify-content: center; align-items: center; gap: 2px; }
.nav-links > a,
.nav-trigger { padding: 8px 10px; border: 0; border-radius: 7px; background: none; color: var(--slate, #525252); font-family: inherit; font-size: 14px; font-weight: 500; line-height: 1.6; white-space: nowrap; cursor: pointer; }
.nav-links > a:hover,
.nav-trigger:hover,
.nav-item.open .nav-trigger { background: var(--bg-tint, #fafafa); color: var(--ink, #0a0a0a); }
.nav-trigger::after { content: ""; display: inline-block; width: 6px; height: 6px; margin: 0 2px 2px 7px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg); opacity: .6; transition: transform .15s; }
.nav-item.open .nav-trigger::after { margin-bottom: -1px; transform: rotate(225deg); }

/* The panel centres on the header bar, not its trigger, so it can never leave the page. */
.nav-panel { display: none; position: absolute; top: calc(100% - 6px); left: 50%; z-index: 60; width: max-content; max-width: calc(100% - 48px); padding: 12px; border: 1px solid var(--border, #e5e5e5); border-radius: 12px; background: var(--bg, #fff); box-shadow: 0 1px 3px rgba(10,10,10,.05), 0 8px 24px -12px rgba(10,10,10,.12), 0 24px 60px -24px rgba(10,10,10,.28); transform: translateX(-50%); }
.nav-panel::before { content: ""; position: absolute; top: -12px; left: 0; right: 0; height: 12px; }
.nav-item.open .nav-panel { display: grid; gap: 4px 12px; }
.nav-cols-1 { grid-template-columns: minmax(0, 320px); }
.nav-cols-2 { grid-template-columns: repeat(2, minmax(0, 320px)); }
.nav-cols-3 { grid-template-columns: repeat(3, minmax(0, 262px)); }
.nav-group { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.nav-group-title { margin: 0; padding: 6px 10px 8px; color: var(--muted, #737373); font-size: 12px; font-weight: 500; }
.nav-links .nav-panel a { display: block; padding: 8px 10px; border-radius: 8px; color: var(--ink, #0a0a0a); font-size: 14px; font-weight: 500; line-height: 1.35; }
.nav-links .nav-panel a:hover { background: var(--bg-tint2, #f5f5f5); color: var(--ink, #0a0a0a); }
.nav-links .nav-panel a:has(.nav-ico) { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 11px; align-items: start; }
.nav-ico { display: grid; place-items: center; width: 32px; height: 32px; border: 1px solid var(--border, #e5e5e5); border-radius: 8px; background: var(--bg, #fff); color: var(--slate, #525252); transition: color .15s, border-color .15s, background .15s; }
.nav-ico svg { width: 17px; height: 17px; }
.nav-links .nav-panel a:hover .nav-ico { border-color: var(--accent-bd, #c4ddf6); background: var(--accent-bg, #eaf2fc); color: var(--accent, #3b82d9); }
.nav-text { min-width: 0; padding-top: 1px; }
.nav-title { display: block; }
.nav-desc { display: block; margin-top: 2px; color: var(--muted, #737373); font-size: 12.5px; font-weight: 400; }
.nav-links .nav-panel a.nav-more { color: var(--accent, #3b82d9); }
.nav-links .nav-panel a.nav-all { grid-column: 1 / -1; margin-top: 4px; padding-top: 11px; border-top: 1px solid var(--border, #e5e5e5); border-radius: 0 0 8px 8px; color: var(--accent, #3b82d9); }

.nav-right { display: flex; flex: 0 0 auto; align-items: center; gap: 6px; }
.nav-login { padding: 8px 12px; border-radius: 7px; color: var(--slate, #525252); font-size: 14px; font-weight: 500; }
.nav-login:hover { background: var(--bg-tint, #fafafa); color: var(--ink, #0a0a0a); }

/* Footer: eight columns */
footer { padding: 56px 0 40px; background: var(--black, #0a0a0a); color: var(--on-dark, #fafafa); }
footer .top { display: block; }
footer .brand .word { color: #fff; }
footer .brand-icon { filter: brightness(0) invert(1); }
footer .tag { max-width: 40ch; margin-top: 12px; color: var(--on-dark-mut, #a3a3a3); font-size: 14px; }
footer .cols { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 40px 32px; margin-top: 40px; }
footer .col h4 { margin: 0 0 14px; color: var(--on-dark-mut, #a3a3a3); font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; }
footer .col a { display: block; margin: 9px 0; color: #d4d4d4; font-size: 14px; line-height: 1.4; }
footer .col a:hover { color: #fff; }
footer .legal { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin-top: 44px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.16); color: var(--on-dark-mut, #a3a3a3); font-size: 13px; }
footer .legal a { color: var(--on-dark-mut, #a3a3a3); }
footer .legal a:hover { color: #fff; }
@media (max-width: 860px) { footer .cols { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

@media (prefers-reduced-motion: reduce) { .nav-trigger::after { transition: none; } }