/* ===================================================
   Shared site header + footer.
   Markup is written into every page by scripts/apply-site-nav.js;
   behaviour lives in site-nav.js. Self-contained on purpose: pages
   load different stylesheets, so nothing here relies on page tokens.
   =================================================== */

:root { --site-nav-h: 64px; }

.site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.9);
  font-family: Geist, Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.site-nav-inner {
  box-sizing: border-box;
  max-width: 1240px;
  height: var(--site-nav-h);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.site-nav a { text-decoration: none; }
.site-nav-brand {
  display: flex;
  align-items: baseline;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.05em;
  color: #090d16;
  flex-shrink: 0;
}
.site-nav-brand span { color: #4f46e5; font-size: 30px; line-height: 0; margin-left: 1px; }

.site-nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0 auto;
}
.site-nav-link,
.site-nav .nav-dropdown-btn {
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 40px;
  padding: 8px 14px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: #475569;
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}
.site-nav-link:hover,
.site-nav-link[aria-current="page"],
.site-nav .nav-dropdown-btn:hover,
.site-nav .nav-dropdown-btn.is-active,
.site-nav .nav-dropdown-btn[aria-expanded="true"] {
  color: #090d16;
  background: rgba(15, 23, 42, 0.05);
}
.site-nav-link[aria-current="page"],
.site-nav .nav-dropdown-btn.is-active { font-weight: 600; }
.site-nav a:focus-visible,
.site-nav button:focus-visible {
  outline: 2px solid #2563eb;
  outline-offset: 2px;
}
.site-nav .nav-arrow { font-size: 10px; transition: transform 0.2s ease; }
.site-nav .nav-dropdown-btn[aria-expanded="true"] .nav-arrow { transform: rotate(180deg); }

.site-nav .nav-item-dropdown { position: relative; }
.site-nav .nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 1001;
  min-width: 210px;
  padding: 6px;
  display: none;
  flex-direction: column;
  gap: 2px;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 14px;
  box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.12), 0 8px 10px -6px rgba(15, 23, 42, 0.06);
}
.site-nav .nav-dropdown-btn[aria-expanded="true"] + .nav-dropdown-menu { display: flex; }
@media (hover: hover) and (min-width: 861px) {
  .site-nav .nav-item-dropdown:hover .nav-dropdown-menu { display: flex; }
  .site-nav .nav-item-dropdown:hover .nav-arrow { transform: rotate(180deg); }
}
.site-nav .nav-dropdown-item {
  display: block;
  padding: 9px 12px;
  border-radius: 8px;
  color: #334155;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}
.site-nav .nav-dropdown-item:hover,
.site-nav .nav-dropdown-item:focus-visible { background: #f1f5f9; color: #0f172a; }
.site-nav .nav-dropdown-item[aria-current="page"] { background: #eef2ff; color: #4338ca; font-weight: 600; }
.site-nav .nav-beta {
  margin-left: 4px;
  padding: 1px 6px;
  border-radius: 999px;
  background: #eef2ff;
  color: #4338ca;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
  vertical-align: 1px;
}

.site-nav-end { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.site-nav-cta {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 18px;
  border: 1px solid #cbd5e1;
  border-radius: 999px;
  background: #ffffff;
  color: #090d16;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.site-nav-cta:hover { background: #090d16; border-color: #090d16; color: #ffffff; }

.site-nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  background: #ffffff;
  color: #0f172a;
  cursor: pointer;
}
.site-nav-toggle-bars,
.site-nav-toggle-bars::before,
.site-nav-toggle-bars::after {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.site-nav-toggle-bars { position: relative; }
.site-nav-toggle-bars::before,
.site-nav-toggle-bars::after { content: ""; position: absolute; left: 0; }
.site-nav-toggle-bars::before { top: -6px; }
.site-nav-toggle-bars::after { top: 6px; }
.site-nav-toggle[aria-expanded="true"] .site-nav-toggle-bars { background: transparent; }
.site-nav-toggle[aria-expanded="true"] .site-nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.site-nav-toggle[aria-expanded="true"] .site-nav-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }

/* Phone / narrow tablet: the menu collapses behind a toggle and opens as a
   full-width panel; Discover and Research expand in place as an accordion,
   so nothing needs hover. */
@media (max-width: 860px) {
  .site-nav-inner { padding: 0 16px; gap: 8px; }
  .site-nav-toggle { display: inline-flex; }
  .site-nav-end { margin-left: auto; }
  .site-nav-cta { padding: 0 14px; }
  .site-nav-end .mode-text { display: none; }
  .site-nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: calc(100vh - var(--site-nav-h));
    overflow-y: auto;
    margin: 0;
    padding: 8px 16px 20px;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    background: #ffffff;
    border-bottom: 1px solid #e2e8f0;
    box-shadow: 0 16px 24px -12px rgba(15, 23, 42, 0.18);
  }
  .site-nav.is-open .site-nav-links { display: flex; }
  .site-nav-link,
  .site-nav .nav-dropdown-btn { width: 100%; min-height: 44px; font-size: 16px; }
  .site-nav .nav-dropdown-btn { justify-content: space-between; }
  .site-nav .nav-dropdown-menu {
    position: static;
    min-width: 0;
    padding: 0 0 6px 12px;
    border: 0;
    box-shadow: none;
  }
  .site-nav .nav-dropdown-item { min-height: 44px; display: flex; align-items: center; font-size: 15px; white-space: normal; }
}
@media (max-width: 380px) {
  .site-nav-cta { display: none; }
}

/* Pages with their own dark-mode switch (seat maps) set data-theme="dark". */
:root[data-theme="dark"] .site-nav { background: rgba(11, 18, 32, 0.92); border-bottom-color: #1e293b; }
:root[data-theme="dark"] .site-nav-brand { color: #f8fafc; }
:root[data-theme="dark"] .site-nav-link,
:root[data-theme="dark"] .site-nav .nav-dropdown-btn { color: #cbd5e1; }
:root[data-theme="dark"] .site-nav-link:hover,
:root[data-theme="dark"] .site-nav .nav-dropdown-btn:hover,
:root[data-theme="dark"] .site-nav .nav-dropdown-btn.is-active,
:root[data-theme="dark"] .site-nav .nav-dropdown-btn[aria-expanded="true"] { color: #f8fafc; background: rgba(148, 163, 184, 0.14); }
:root[data-theme="dark"] .site-nav .nav-dropdown-menu,
:root[data-theme="dark"] .site-nav-links { background: #0f172a; border-color: #1e293b; }
:root[data-theme="dark"] .site-nav .nav-dropdown-item { color: #cbd5e1; }
:root[data-theme="dark"] .site-nav .nav-dropdown-item:hover { background: #1e293b; color: #f8fafc; }
:root[data-theme="dark"] .site-nav-cta,
:root[data-theme="dark"] .site-nav-toggle { background: #0f172a; border-color: #334155; color: #f8fafc; }
@media (min-width: 861px) {
  :root[data-theme="dark"] .site-nav-links { background: transparent; }
}

/* ---------- Shared footer (only added to pages without their own) ---------- */
.site-footer {
  margin-top: 64px;
  border-top: 1px solid #e2e8f0;
  background: #ffffff;
  font-family: Geist, Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.site-footer-inner {
  box-sizing: border-box;
  max-width: 1240px;
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 32px;
}
.site-footer a { text-decoration: none; }
.site-footer-brand p { margin: 12px 0 0; max-width: 300px; color: #64748b; font-size: 14px; line-height: 1.5; }
.site-footer-col { display: flex; flex-direction: column; gap: 10px; }
.site-footer-col strong { margin-bottom: 2px; color: #0f172a; font-size: 13px; font-weight: 700; }
.site-footer-col a { color: #64748b; font-size: 14px; }
.site-footer-col a:hover { color: #0f172a; }
.site-footer a:focus-visible { outline: 2px solid #2563eb; outline-offset: 2px; }
.site-footer-bottom {
  box-sizing: border-box;
  max-width: 1240px;
  margin: 0 auto;
  padding: 20px 24px 32px;
  border-top: 1px solid #f1f5f9;
  color: #64748b;
  font-size: 13px;
}
@media (max-width: 760px) {
  .site-footer-inner { grid-template-columns: 1fr 1fr; padding: 40px 16px 24px; gap: 28px 20px; }
  .site-footer-brand { grid-column: 1 / -1; }
  .site-footer-bottom { padding: 16px 16px 28px; }
}