:root {
  --header-bg: #012169;
  --header-fg: #fff;
  --panel-bg: #fff;
  --text: #1f2328;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--panel-bg);
}

body {
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 1rem;
  background: var(--header-bg);
  color: var(--header-fg);
}

header h1 {
  margin: 0;
  font-size: 1.1rem;
}

header .badge {
  margin-left: auto;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: #fff;
  color: var(--header-bg);
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

header button {
  font: inherit;
  padding: 0.25rem 0.75rem;
  border: 1px solid currentColor;
  border-radius: 4px;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

#about {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #ddd;
  font-size: 0.9rem;
  max-height: 40vh;
  overflow-y: auto;
}

#about p { margin: 0 0 0.5rem; max-width: 70ch; }
#data-dates { margin: 0; padding-left: 1.25rem; font-size: 0.8rem; color: #555; }

.layout {
  flex: 1;
  min-height: 0;
  display: flex;
  position: relative;
}

#map {
  flex: 1;
  min-width: 0;
}

#sidebar {
  width: 300px;
  flex: none;
  display: flex;
  flex-direction: column;
  border-right: 1px solid #ddd;
  background: var(--panel-bg);
}

#sidebar[hidden] { display: none; }

.sidebar-head {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid #ddd;
}

.sidebar-head h2 { margin: 0 0 0.4rem; font-size: 0.95rem; }
#frz-count { font-weight: 400; color: #555; }

#frz-filter {
  width: 100%;
  font: inherit;
  font-size: 0.85rem;
  padding: 0.3rem 0.5rem;
  border: 1px solid #bbb;
  border-radius: 4px;
}

#frz-list {
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-y: auto;
  flex: 1;
}

#frz-list li { border-bottom: 1px solid #eee; }

#frz-list button {
  display: block;
  width: 100%;
  text-align: left;
  font: inherit;
  padding: 0.55rem 0.75rem 0.55rem 0.6rem;
  border: 0;
  border-left: 4px solid transparent;
  background: none;
  color: inherit;
  cursor: pointer;
}

#frz-list button:hover,
#frz-list button:focus-visible { background: #f3f4f6; }

#frz-list li.active button {
  border-left-color: #e66101;
  background: #fdf0e6;
}

#frz-list .school-name { font-weight: 600; font-size: 0.9rem; }
#frz-list .meta { font-size: 0.78rem; color: #555; margin-top: 0.1rem; }

#frz-list .details {
  font-size: 0.78rem;
  padding: 0 0.75rem 0.6rem 1rem;
  background: #fdf0e6;
}

#frz-list .details a { color: #012169; }

.legend {
  background: var(--panel-bg);
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
  font-size: 0.8rem;
  line-height: 1.5;
}

.legend .swatch {
  display: inline-block;
  width: 1.5rem;
  height: 0.7rem;
  margin-right: 0.4rem;
  vertical-align: middle;
}

.legend .line { height: 0; border-top-width: 3px; border-top-style: solid; }

.leaflet-popup-content { font-size: 0.85rem; }
.leaflet-popup-content h3 { margin: 0 0 0.25rem; font-size: 0.95rem; }
.leaflet-popup-content table { border-collapse: collapse; }
.leaflet-popup-content th { text-align: left; padding-right: 0.5rem; font-weight: 600; vertical-align: top; }

@media (max-width: 700px) {
  header h1 { font-size: 0.95rem; }
  header .badge { display: none; }
  .legend { display: none; }
  /* Sidebar becomes a drawer over the map. */
  #sidebar {
    position: absolute;
    inset: 0 auto 0 0;
    width: min(85vw, 320px);
    z-index: 1000;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.25);
  }
}