/* ============================================================
   Base reset & custom properties
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #F8FAFC;
  --surface: #FFFFFF;
  --border: #E2E8F0;
  --text: #1E293B;
  --text-muted: #64748B;
  --accent-a: #3B82F6;
  --accent-b: #F59E0B;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
}

html { font-size: 16px; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

/* ============================================================
   Layout
   ============================================================ */
.app-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.app-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
}

.controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  flex: 1;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.control-group label {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

select, input[type="number"] {
  height: 2rem;
  padding: 0 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  color: var(--text);
  background: var(--surface);
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s;
}

select:focus, input[type="number"]:focus {
  border-color: var(--accent-a);
  box-shadow: 0 0 0 3px rgba(59,130,246,.15);
}

select { min-width: 150px; max-width: 200px; }
input[type="number"] { width: 76px; }

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
  flex-shrink: 0;
}

.btn-lang {
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--surface);
  cursor: pointer;
  color: var(--text-muted);
  transition: background 0.15s, color 0.15s;
}

.btn-lang:hover { background: var(--bg); color: var(--text); }

#build-date {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ============================================================
   Main content
   ============================================================ */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem;
}

#quality-warnings {
  background: #FEF9C3;
  border: 1px solid #FDE047;
  border-radius: var(--radius);
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
  margin-bottom: 1rem;
  color: #713F12;
}

#placeholder {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-muted);
  font-size: 1rem;
}

#status {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ============================================================
   Chart sections
   ============================================================ */
.section {
  margin-bottom: 2rem;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  user-select: none;
  padding: 0.5rem 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1rem;
}

.section-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.section-arrow {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: transform 0.2s;
}

.section.collapsed .section-arrow { transform: rotate(-90deg); }
.section.collapsed .section-body { display: none; }

/* Section accent bars */
.section[data-section="temperature"] .section-header { border-color: var(--accent-a); }
.section[data-section="sun"] .section-header { border-color: #FBBF24; }
.section[data-section="precipitation"] .section-header { border-color: #34D399; }
.section[data-section="wind"] .section-header { border-color: #A78BFA; }
.section[data-section="thresholds"] .section-header { border-color: #FB7185; }

.chart-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 720px;
}

.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.chart-container {
  width: 100%;
  min-height: 300px;
}

/* ============================================================
   Tabs
   ============================================================ */
.tabs {
  display: flex;
  gap: 0.25rem;
  background: var(--bg);
  border-radius: var(--radius);
  padding: 2px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.tab {
  padding: 0.3rem 0.85rem;
  border: none;
  background: transparent;
  border-radius: calc(var(--radius) - 2px);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}

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

.tab-active {
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
}

/* ============================================================
   Ranking table
   ============================================================ */
.ranking-wrapper {
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.ranking-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.ranking-table th,
.ranking-table td {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  white-space: nowrap;
}

.ranking-table th {
  background: var(--bg);
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  cursor: pointer;
  user-select: none;
  position: sticky;
  top: 0;
  z-index: 2;
}

.ranking-table th:hover {
  color: var(--text);
  background: #E2E8F0;
}

.ranking-table th.num,
.ranking-table td.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.ranking-table th::after {
  display: inline-block;
  margin-left: 0.3rem;
  font-size: 0.7em;
  opacity: 0.4;
  content: "↕";
}
.ranking-table th.sort-asc::after  { content: "▲"; opacity: 1; color: var(--accent-a); }
.ranking-table th.sort-desc::after { content: "▼"; opacity: 1; color: var(--accent-a); }

.ranking-table tbody tr:hover { background: var(--bg); }
.ranking-table tbody tr:last-child td { border-bottom: none; }

.ranking-table .sticky-col {
  position: sticky;
  left: 0;
  background: var(--surface);
  z-index: 1;
  box-shadow: 1px 0 0 var(--border);
}
.ranking-table th.sticky-col {
  background: var(--bg);
  z-index: 3;
}
.ranking-table tbody tr:hover .sticky-col { background: var(--bg); }

#ranking-status {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ============================================================
   Responsive header
   ============================================================ */
@media (max-width: 640px) {
  .header-inner { padding: 0.6rem 0.75rem; }
  .app-title { font-size: 0.95rem; }
  select { min-width: 120px; }
  #build-date { display: none; }
  .ranking-table { font-size: 0.8rem; }
  .ranking-table th, .ranking-table td { padding: 0.4rem 0.5rem; }
}