.opening-notice-open { overflow: hidden; }
.opening-notice {
  width: min(720px, calc(100% - 28px));
  max-width: none;
  max-height: calc(100vh - 28px);
  max-height: calc(100dvh - 28px);
  padding: 0;
  margin: auto;
  border: 1px solid var(--border);
  border-top: 4px solid var(--warn);
  border-radius: 20px;
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 24px 80px rgba(0,0,0,.3);
  font: inherit;
}
.opening-notice[open] { display: flex; flex-direction: column; }
.opening-notice::backdrop { background: rgba(3,8,23,.76); }
.opening-notice-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; padding: 22px 24px 14px; }
.opening-notice-kicker { margin: 0 0 6px; font-size: 11px; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; color: var(--text-muted); }
.opening-notice h2 { margin: 0; font-size: clamp(19px,3vw,23px); line-height: 1.3; font-weight: 800; color: var(--nav-link); }
.opening-notice h2:focus { outline: none; }
.opening-notice-close { display: grid; place-items: center; flex: 0 0 40px; width: 40px; height: 40px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface2); color: var(--text-muted); font-size: 25px; cursor: pointer; }
.opening-notice-body { min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding: 0 24px 6px; font-size: 14px; line-height: 1.55; color: var(--text-muted); }
.opening-notice-body p { margin: 0 0 13px; }
.opening-notice-body strong { color: var(--text); }
.opening-notice-session { margin: 0 0 18px; padding: 16px 18px; border: 1px solid var(--border); border-left: 4px solid var(--nav-link); border-radius: 12px; background: var(--surface2); }
.opening-notice-session h3 { margin: 0 0 7px; font-size: 17px; line-height: 1.35; font-weight: 800; color: var(--nav-link); }
.opening-notice-session p:last-child { margin-bottom: 0; }
.opening-notice-timing { font-size: 12px; }
.opening-notice-urgent { padding: 13px 15px; margin-bottom: 14px; border-left: 3px solid var(--warn); border-radius: 10px; background: var(--surface2); }
.opening-notice-body .opening-notice-details { margin-bottom: 8px; font-size: 11px; }
.opening-notice-footer { flex: 0 0 auto; padding: 14px 24px 22px; border-top: 1px solid var(--border); }
.opening-notice-continue { width: 100%; min-height: 46px; padding: 11px 16px; white-space: normal; }
.opening-notice button:focus-visible { outline: 3px solid var(--nav-link); outline-offset: 3px; }
@media (max-width: 480px) {
  .opening-notice { border-radius: 14px; }
  .opening-notice-header { padding: 16px 16px 12px; gap: 8px; }
  .opening-notice-body { padding: 0 16px 4px; }
  .opening-notice-footer { padding: 12px 16px 16px; }
  .opening-notice-session { padding: 13px; }
}
@media print { .opening-notice, .opening-notice::backdrop { display: none !important; } }