/* Stronger visual hierarchy for the site navigation. */
#main-nav {
  margin-left: auto;
  gap: 4px;
  padding: 8px 10px;
  border-radius: 5px;
  background: linear-gradient(110deg, #0f4c81, #176f9e 55%, #147a78);
  box-shadow: 0 3px 9px #123b6833;
}

#main-nav > a:not(.button) {
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .01em;
  padding: 6px 12px;
  border-radius: 3px;
}

.header-inner.wrap {
  width: min(1440px, calc(100% - 48px));
  gap: 20px;
}

.header-brand {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  gap: 14px;
  flex: 0 1 auto;
  min-width: 0;
}

.brand-logo {
  position: relative;
  display: block;
  flex: 0 0 80px;
  width: 80px;
  height: 80px;
  overflow: hidden;
  background: #4e6a74;
  border-radius: 5px;
}

.brand-logo img {
  position: absolute;
  width: 130px;
  height: 130px;
  max-width: none;
  left: -25px;
  top: -9px;
}

.header-brand-title {
  font: 700 clamp(19px, 1.8vw, 27px)/1.08 Georgia, 'Times New Roman', serif;
  letter-spacing: -.02em;
  white-space: nowrap;
}

.event-notice {
  display: flex;
  align-items: flex-start;
  gap: 17px;
  margin-bottom: 32px;
  padding: 20px 22px;
  background: #fff2b8;
  border: 2px solid #e8bc46;
  border-radius: 8px;
  color: #432f14;
  font-size: 17px;
  line-height: 1.5;
}

.event-notice strong { display: block; color: #7f231f; font-size: 20px; }
.event-notice p { margin: 3px 0 0; }
.notice-icon {
  display: grid;
  place-items: center;
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: #b9272b;
  color: #fff;
  font: 800 25px/1 Arial, sans-serif;
}

.about-panel { max-width: 850px; }
.about-panel p { margin: 0 0 14px; color: var(--muted); }
.about-panel p:last-child { margin-bottom: 0; }
.about-panel a { color: var(--blue); }

#main-nav > a:not(.button)::after {
  content: '';
  display: block;
  width: 100%;
  height: 2px;
  margin-top: 3px;
  background: transparent;
}

#main-nav > a:not(.button):hover::after,
#main-nav > a[aria-current='page']::after {
  background: #fff;
}

#main-nav > a:not(.button):hover,
#main-nav > a[aria-current='page'] {
  color: #fff;
  background: #ffffff26;
  text-decoration: none;
}

@media (max-width: 1100px) {
  .header-inner { position: relative; }
  .menu-toggle { display: block; margin-left: auto; }
  .header-inner nav { display: none; position: absolute; top: 100%; left: 0; right: 0; z-index: 3; border: 1px solid var(--line); padding: 10px; box-shadow: 0 8px 20px #1724341a; }
  .header-inner nav.open { display: flex; flex-direction: column; align-items: stretch; gap: 8px; }
}

@media (max-width: 850px) {
  #main-nav { background: linear-gradient(110deg, #0f4c81, #176f9e 55%, #147a78); }
  #main-nav > a:not(.button) { font-size: 19px; }
  #main-nav > a:not(.button)::after { display: none; }
}

@media (max-width: 600px) {
  .header-inner.wrap { width: calc(100% - 32px); min-height: 74px; }
  .header-brand { gap: 9px; }
  .brand-logo { flex-basis: 52px; width: 52px; height: 52px; }
  .brand-logo img { width: 84px; height: 84px; left: -16px; top: -5px; }
  .header-brand-title { font-size: clamp(13px, 3.4vw, 17px); white-space: normal; }
  .event-notice { padding: 15px; font-size: 15px; gap: 11px; }
  .event-notice strong { font-size: 18px; }
  .notice-icon { flex-basis: 28px; width: 28px; height: 28px; font-size: 21px; }
}