/* =============================================================
   HF Band Scout — Layout
   Topbar, navigation, screen switching, responsive grid
   ============================================================= */

/* ── App shell ── */
#topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-h);
  z-index: 500;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  padding: 0 var(--space-3);
  gap: var(--space-3);
}

#topbar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-md);
  color: var(--text-primary);
  flex-shrink: 0;
}

.logo-icon { font-size: 18px; }
.logo-text  { letter-spacing: -0.01em; }

#topbar-conditions {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-width: 0;
}

.cond-badge {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 2px var(--space-2);
  color: var(--text-secondary);
  white-space: nowrap;
}

.cond-badge.kp-high { border-color: var(--accent-danger); color: var(--accent-danger); }
.cond-badge.kp-storm { border-color: var(--accent-warning); color: var(--accent-warning); }

.cond-age {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  white-space: nowrap;
}

/* ── Navigation ── */
#app-nav {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 490;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

#app-nav::-webkit-scrollbar { display: none; }

.nav-tab {
  flex: 1;
  min-width: 72px;
  height: 100%;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  padding: 0 var(--space-3);
  white-space: nowrap;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.nav-tab:hover { color: var(--text-primary); }

.nav-tab.is-active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

/* ── Screens ── */
.screen {
  position: fixed;
  top: calc(var(--topbar-h) + var(--nav-h));
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  background: var(--bg-primary);
}

.screen[hidden] { display: none !important; }
.screen { display: none; }
.screen.is-active { display: block; }
#screen-map.is-active { display: flex; }

/* Map screen has no scroll (Leaflet fills it) */
#screen-map {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* ── Settings screen ── */
#screen-settings {
  padding: var(--space-4);
  padding-bottom: var(--space-8);
}

#settings-content {
  max-width: 540px;
  margin: 0 auto;
}

/* ── List screens ── */
#screen-by-band,
#screen-by-region,
#screen-opening {
  display: flex;
  flex-direction: column;
}

/* Controls bar at top of list screens */
#byband-controls,
#byregion-controls,
#opening-controls {
  flex-shrink: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-3) var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

#byband-list,
#opening-list {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-2) 0;
}

/* ── Filter buttons ── */
.filter-btn {
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  min-height: 32px;
}

.filter-btn.active,
.filter-btn:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #fff;
}

/* ── Horizon buttons ── */
.horizon-btn {
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  min-height: 32px;
}

.horizon-btn.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #fff;
}

/* ── By-region search ── */
#byregion-search-wrap {
  flex: 1;
  min-width: 200px;
}

#byregion-search {
  width: 100%;
  min-height: 36px;
}

#byregion-content {
  padding: var(--space-4);
}

/* ── Band selector (map + list screens) ── */
#band-selector {
  flex-shrink: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: stretch;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 0 var(--space-2);
  height: 52px; /* UI-FIX: was 40px — min. 44px touch target + leesbaarheid */
}

#band-selector::-webkit-scrollbar { display: none; }

.band-tab {
  flex-shrink: 0;
  padding: 0 var(--space-4);
  height: 52px;            /* UI-FIX: 44px+ touch target */
  min-width: 56px;
  font-size: 15px;          /* UI-FIX: was 12px — onleesbaar op mobiel */
  font-weight: var(--font-weight-medium);
  font-family: var(--font-mono);
  color: var(--text-primary); /* UI-FIX: was secondary — te laag contrast */
  border-bottom: 3px solid transparent;
  white-space: nowrap;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.band-tab:hover:not(:disabled) { color: var(--text-primary); }

.band-tab.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
  font-weight: 700;
  background: color-mix(in srgb, var(--accent-primary) 12%, transparent);
}

.band-tab:disabled {
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.45;
  font-size: 13px; /* niet-toegankelijke banden visueel ondergeschikt maar leesbaar */
}

/* ── Conditions bar ── */
#conditions-bar {
  flex-shrink: 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
}

.cond-toggle {
  width: 100%;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.cond-chevron {
  transition: transform var(--transition-fast);
}

.cond-toggle[aria-expanded="false"] .cond-chevron {
  transform: rotate(-90deg);
}

#conditions-detail {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-2) var(--space-4) var(--space-3);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.cond-toggle[aria-expanded="false"] + #conditions-detail {
  display: none;
}

.cond-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.cond-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cond-value {
  font-family: var(--font-mono);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

/* ── Alerts bar ── */
#alerts-bar {
  flex-shrink: 0;
  background: rgba(226, 75, 74, 0.12);
  border-top: 1px solid rgba(226, 75, 74, 0.3);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--accent-danger);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ── Responsive: wider screens ── */
@media (min-width: 640px) {
  #topbar-logo .logo-text { display: inline; }
  .nav-tab { font-size: var(--font-size-base); }
  #settings-content { padding: 0 var(--space-4); }
}

@media (max-width: 340px) {
  .logo-text { display: none; }
  .nav-tab { min-width: 60px; padding: 0 var(--space-2); }
}