:root {
  /* Match MkDocs Material default indigo palette */
  --rm-nav-bg: #4051b5;
  --rm-nav-bg-dark: #303f9f;
  --rm-nav-text: #ffffff;
  --rm-nav-muted: rgba(255, 255, 255, 0.78);
  --rm-nav-active: #ffffff;
  --rm-nav-border: rgba(255, 255, 255, 0.22);
  --rm-banner-bg: #fff3cd;
  --rm-banner-text: #5c4a00;

  --rm-primary: #4051b5;
  --rm-primary-dark: #303f9f;
  --rm-bg: #fafafa;
  --rm-surface: #ffffff;
  --rm-text: rgba(0, 0, 0, 0.87);
  --rm-text-muted: rgba(0, 0, 0, 0.62);
  --rm-border: rgba(0, 0, 0, 0.12);
  --rm-font: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

.rm-portal-header {
  background: var(--rm-nav-bg);
  color: var(--rm-nav-text);
  border-bottom: 1px solid var(--rm-nav-border);
  font-family: var(--rm-font);
}

.rm-portal-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1rem;
  max-width: 76rem;
  margin: 0 auto;
  padding: 0.65rem 1rem;
}

.rm-portal-brand {
  color: var(--rm-nav-active);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  margin-right: 0.25rem;
}

.rm-portal-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem 0.35rem;
  flex: 1 1 auto;
}

.rm-nav-link,
.rm-nav-dropdown > summary {
  color: var(--rm-nav-muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.35rem 0.55rem;
  border-radius: 4px;
  list-style: none;
  cursor: pointer;
  white-space: nowrap;
}

.rm-nav-link:hover,
.rm-nav-dropdown > summary:hover,
.rm-nav-link.is-active,
.rm-nav-dropdown[open] > summary {
  color: var(--rm-nav-active);
  background: rgba(255, 255, 255, 0.14);
}

.rm-nav-dropdown > summary::-webkit-details-marker { display: none; }

.rm-nav-dropdown {
  position: relative;
}

.rm-nav-dropdown__menu {
  position: absolute;
  top: calc(100% + 0.25rem);
  left: 0;
  min-width: 14rem;
  background: var(--rm-nav-bg-dark);
  border: 1px solid var(--rm-nav-border);
  border-radius: 6px;
  padding: 0.35rem 0;
  z-index: 20;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.rm-nav-sublink {
  display: block;
  padding: 0.45rem 0.85rem;
  color: var(--rm-nav-muted);
  text-decoration: none;
  font-size: 0.9rem;
}

.rm-nav-sublink:hover,
.rm-nav-sublink.is-active {
  color: var(--rm-nav-active);
  background: rgba(255, 255, 255, 0.1);
}

/* High-contrast search: white field + white button on indigo header */
.rm-portal-search {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-left: auto;
  flex: 0 1 320px;
  min-width: 200px;
}

.rm-portal-search input[type="search"] {
  flex: 1;
  min-width: 0;
  padding: 0.45rem 0.65rem;
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 4px;
  background: #ffffff;
  color: rgba(0, 0, 0, 0.87);
}

.rm-portal-search input[type="search"]::placeholder {
  color: rgba(0, 0, 0, 0.54);
}

.rm-portal-search button {
  background: #ffffff;
  color: var(--rm-primary);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 4px;
  padding: 0.45rem 0.75rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}

.rm-portal-search button:hover {
  background: #f0f0f0;
}

.rm-portal-banner {
  background: var(--rm-banner-bg);
  color: var(--rm-banner-text);
  text-align: center;
  font-size: 0.88rem;
  padding: 0.45rem 1rem;
}

@media (max-width: 900px) {
  .rm-portal-header__inner {
    flex-direction: column;
    align-items: stretch;
  }
  .rm-portal-search {
    margin-left: 0;
    flex: 1 1 auto;
    width: 100%;
  }
}