/* Layout — CSS Grid, container-query-driven.
   iPad-first: Querformat = Filter links + Karte gross + Detail unten;
   Hochformat & Phones: alles untereinander. */

.app {
  display: grid;
  grid-template-columns: minmax(280px, 320px) 1fr;
  grid-template-rows: auto 1fr auto;
  grid-template-areas:
    "header  header"
    "filters map"
    "filters detail";
  gap: 0;
  min-height: 100dvh;
  padding: var(--safe-top) var(--safe-right) var(--safe-bottom) var(--safe-left);
}

.masthead { grid-area: header; }
.filters  { grid-area: filters; }
.map-wrap { grid-area: map; }
.detail   { grid-area: detail; }

/* ───── Masthead ───── */
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  gap: var(--space-4);
  flex-wrap: wrap;
}
.masthead__brand { display: flex; align-items: center; gap: var(--space-4); min-width: 0; }
.masthead__mark {
  width: 44px; height: 44px;
  background: var(--rust); color: var(--paper);
  font-family: var(--font-display); font-weight: 600; font-size: 1.5rem;
  display: grid; place-items: center;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}
.masthead__title { font-size: var(--type-2xl); margin: 0; }
.masthead__subtitle {
  margin: 0;
  font-size: var(--type-sm);
  color: var(--ink-soft);
  font-family: var(--font-display);
  font-style: italic;
}
.masthead__meta { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }

.meta-pill {
  display: inline-flex; align-items: center;
  padding: 0.4em 0.85em;
  background: var(--paper-deep);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: var(--type-xs);
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

.icon-btn {
  width: var(--touch-min); height: var(--touch-min);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  color: var(--ink-soft);
  display: grid; place-items: center;
  transition: background 200ms var(--ease-out), color 200ms var(--ease-out);
}
.icon-btn:hover, .icon-btn:focus-visible {
  background: var(--paper-deep);
  color: var(--rust-deep);
  outline: none;
}
.icon-btn:focus-visible { box-shadow: 0 0 0 3px var(--paper-tint); }

/* ───── Filter ───── */
.filters {
  border-right: 1px solid var(--line);
  background: var(--paper);
  padding: var(--space-5) var(--space-4);
  overflow-y: auto;
  scrollbar-gutter: stable;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.filter-group {
  border-bottom: 1px solid var(--line);
  padding-bottom: var(--space-4);
}
.filter-group:last-of-type { border-bottom: none; padding-bottom: 0; }
.filter-group > summary {
  font-family: var(--font-display);
  font-size: var(--type-md);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  padding: var(--space-2) 0;
  color: var(--ink);
  user-select: none;
}
.filter-group > summary::-webkit-details-marker { display: none; }
.filter-group > summary::after {
  content: "—";
  float: right;
  color: var(--ink-faint);
  transition: transform 200ms var(--ease-out);
}
.filter-group:not([open]) > summary::after { content: "+"; }

.filter-search {
  width: 100%;
  margin: var(--space-2) 0;
  padding: 0.55em 0.8em;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper-deep);
  font: inherit;
  color: var(--ink);
}
.filter-search:focus { outline: 2px solid var(--rust); outline-offset: 1px; }

.text-btn {
  background: transparent;
  border: none;
  color: var(--rust-deep);
  text-decoration: underline;
  text-underline-offset: 0.2em;
  font-size: var(--type-sm);
  padding: var(--space-2) 0;
  align-self: flex-start;
}

/* ───── Map ───── */
.map-wrap {
  position: relative;
  background: var(--paper);
  overflow: hidden;
}
#map { position: absolute; inset: 0; }
.map-overlay {
  position: absolute;
  top: var(--space-3); left: 50%;
  transform: translateX(-50%);
  background: var(--paper);
  border: 1px solid var(--line);
  padding: var(--space-2) var(--space-4);
  border-radius: 999px;
  font-size: var(--type-sm);
  color: var(--ink-soft);
  z-index: 800;
  box-shadow: var(--shadow-soft);
  pointer-events: none;
  opacity: 0;
  transition: opacity 250ms var(--ease-out);
}
.map-overlay.visible { opacity: 1; }

/* ───── Detail ───── */
.detail {
  background: var(--paper);
  border-top: 1px solid var(--line);
  max-height: min(48vh, 520px);
  overflow-y: auto;
  position: relative;
  animation: slide-up 240ms var(--ease-out);
}
.detail[hidden] { display: none; }
.detail__close {
  position: absolute;
  top: var(--space-3); right: var(--space-3);
  width: 36px; height: 36px;
  background: var(--paper-deep);
  border: none;
  border-radius: 999px;
  font-size: 1.25rem;
  line-height: 1;
  color: var(--ink-soft);
}
.detail__inner { padding: var(--space-5) var(--space-6); }

@keyframes slide-up {
  from { transform: translateY(40px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

/* ───── Hochformat / Phones (Container-Query-aehnlich via media query) ───── */
@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr auto;
    grid-template-areas:
      "header"
      "filters"
      "map"
      "detail";
  }
  .filters {
    border-right: none;
    border-bottom: 1px solid var(--line);
    max-height: 35vh;
  }
  .masthead__subtitle { display: none; }
}