.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid var(--color-editorial-divider);
  background: rgba(244, 246, 246, 0.88);
  backdrop-filter: blur(18px);
}

.site-header__inner {
  display: flex;
  width: min(100%, var(--page-max));
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  margin-inline: auto;
  padding: 18px var(--page-gutter);
}

.brand-mark {
  color: var(--color-primary-ink);
  font-size: 0.95rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0;
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0;
  color: rgba(17, 20, 19, 0.66);
  font-size: 0.86rem;
  font-weight: 550;
}

.site-nav a {
  border-left: 1px solid rgba(17, 20, 19, 0.16);
  padding: 2px 14px;
  text-decoration: none;
  transition: color 180ms ease, box-shadow 180ms ease;
}

.site-nav a:last-child {
  border-right: 1px solid rgba(17, 20, 19, 0.16);
}

.site-nav a:focus-visible,
.site-nav a:hover {
  color: var(--color-yelopa-navy);
  box-shadow: inset 0 -2px 0 var(--color-yelopa-light-blue);
  outline: 0;
}

.mobile-nav {
  display: none;
}

.site-footer {
  border-top: 1px solid var(--color-editorial-divider);
}

.site-footer__inner {
  display: flex;
  width: min(100%, var(--page-max));
  justify-content: flex-start;
  gap: var(--space-5);
  margin-inline: auto;
  padding: 24px var(--page-gutter);
  color: var(--color-supporting-text);
  font-size: 0.9rem;
}

.site-footer address {
  font-style: normal;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border: 1px solid rgba(20, 58, 87, 0.34);
  border-radius: 0;
  padding: 0 22px;
  background: rgba(255, 253, 248, 0.32);
  color: var(--color-yelopa-navy);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  text-decoration: none;
  box-shadow: inset 0 -1px 0 rgba(20, 58, 87, 0.12);
  transition: border-color 180ms ease, box-shadow 180ms ease, color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.button:hover {
  border-color: var(--color-yelopa-navy);
  background: var(--color-light-surface);
  box-shadow: inset 0 -2px 0 var(--color-yelopa-navy);
  transform: translateY(-1px);
}

.button:focus-visible {
  outline: 2px solid var(--color-yelopa-light-blue);
  outline-offset: 3px;
}

.button--primary {
  border-color: var(--color-yelopa-navy);
  background: var(--color-yelopa-navy);
  color: var(--color-light-surface);
  box-shadow: inset 0 -1px 0 rgba(255, 253, 248, 0.22);
}

.button--primary:hover {
  border-color: var(--color-deep-navy);
  background: var(--color-deep-navy);
  box-shadow: inset 0 -2px 0 var(--color-yelopa-light-blue);
}

.button--pulse {
  animation: button-pulse 2.4s ease-in-out infinite;
}

.button--light {
  border-color: rgba(255, 253, 248, 0.34);
  background: transparent;
  color: var(--color-light-surface);
  box-shadow: inset 0 -1px 0 rgba(255, 253, 248, 0.18);
}

.button--light:hover {
  border-color: var(--color-light-surface);
  background: rgba(255, 253, 248, 0.08);
  box-shadow: inset 0 -2px 0 var(--color-light-surface);
}

.panel {
  border: 1px solid var(--color-editorial-divider);
  border-radius: var(--panel-radius);
  padding: var(--panel-padding);
  background: var(--color-light-surface);
}

.contact-panel {
  border-radius: var(--panel-radius);
  padding: var(--panel-padding);
  background: var(--color-yelopa-navy);
  color: var(--color-light-surface);
}

.proposal-document {
  overflow: hidden;
  border: 1px solid rgba(17, 20, 19, 0.12);
  border-radius: var(--document-radius);
  background: var(--color-light-surface);
  box-shadow: 0 24px 60px rgba(12, 41, 62, 0.11);
}

.document-rule {
  height: 1px;
  background: var(--color-editorial-divider);
}

@keyframes button-pulse {
  0%,
  100% {
    box-shadow: inset 0 -1px 0 rgba(255, 255, 255, 0.22), 0 0 0 0 rgba(20, 58, 87, 0);
  }

  45% {
    box-shadow: inset 0 -2px 0 var(--color-yelopa-light-blue), 0 0 0 7px rgba(20, 58, 87, 0.13);
  }
}

@media (prefers-reduced-motion: reduce) {
  .button--pulse {
    animation: none;
  }
}

@media (max-width: 720px) {
  .site-header__inner {
    align-items: center;
    flex-direction: row;
  }

  .site-footer__inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    display: none;
  }

  .mobile-nav {
    position: relative;
    display: block;
    margin-left: auto;
    color: var(--color-primary-ink);
    font-size: 0.86rem;
  }

  .mobile-nav summary {
    border-left: 1px solid rgba(17, 20, 19, 0.16);
    border-right: 1px solid rgba(17, 20, 19, 0.16);
    padding: 2px 14px;
    cursor: pointer;
    font-weight: 550;
    list-style: none;
  }

  .mobile-nav summary::-webkit-details-marker {
    display: none;
  }

  .mobile-nav nav {
    position: absolute;
    z-index: 25;
    top: calc(100% + 14px);
    right: 0;
    display: grid;
    min-width: 190px;
    border: 1px solid var(--color-editorial-divider);
    background: var(--color-light-surface);
    box-shadow: 0 18px 44px rgba(12, 41, 62, 0.12);
  }

  .mobile-nav a {
    padding: 12px 14px;
    border-bottom: 1px solid var(--color-editorial-divider);
    color: var(--color-primary-ink);
    text-decoration: none;
  }

  .mobile-nav a:last-child {
    border-bottom: 0;
  }
}