/* ── RESET & BASE ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #111318;
  --surface:   #1c1f2e;
  --surface2:  #252836;
  --surface3:  #2e3147;
  --border:    #383c54;
  --text:      #eef0f8;
  --muted:     #9aa0c0;
  --accent:    #6c8ef5;
  --nav-h:     54px;
  --panel-w:   330px;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
}

/* ── NAVBAR ─────────────────────────────────────────────────────── */
.navbar {
  height: var(--nav-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 2000;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 15px;
  font-weight: 700;
  white-space: nowrap;
  color: var(--text);
  letter-spacing: -0.2px;
}

.nav-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #00c853;
  box-shadow: 0 0 8px #00c853aa;
  animation: pulse 2.5s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.35; }
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
}

.search-input {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 7px;
  padding: 7px 13px;
  font-size: 13px;
  width: 230px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(108,142,245,0.15);
}
.search-input::placeholder { color: var(--muted); }

.pollutant-select,
.trend-days-select {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 7px;
  padding: 7px 11px;
  font-size: 13px;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}
.pollutant-select:focus,
.trend-days-select:focus { border-color: var(--accent); }

.btn-secondary {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 7px;
  padding: 7px 14px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.btn-secondary:hover { background: var(--surface3); border-color: var(--accent); }

.btn-primary {
  background: var(--accent);
  border: none;
  color: #fff;
  border-radius: 7px;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s;
  white-space: nowrap;
}
.btn-primary:hover { opacity: 0.88; }

.nav-source {
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
}
.last-updated { margin-left: 4px; color: var(--accent); }

/* ── MAP SECTION ────────────────────────────────────────────────── */
.map-section {
  height: calc(100vh - var(--nav-h));
  display: flex;
  flex-direction: column;
  position: relative;
}

.layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

#map { flex: 1; z-index: 1; touch-action: none; }

/* ── PANELS ─────────────────────────────────────────────────────── */
.left-panel,
.right-panel {
  width: var(--panel-w);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  z-index: 500;
  flex-shrink: 0;
}
.left-panel  { border-right: 1px solid var(--border); }
.right-panel { border-left:  1px solid var(--border); }

.hidden { display: none !important; }

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--surface2);
}
.panel-header h3 { font-size: 13px; font-weight: 600; color: var(--text); }

.close-btn {
  background: none; border: none; color: var(--muted);
  cursor: pointer; font-size: 14px; padding: 2px 6px;
  border-radius: 4px; transition: color 0.2s;
}
.close-btn:hover { color: var(--text); }

/* ── TOP POLLUTED LIST ──────────────────────────────────────────── */
.top-polluted-list { padding: 6px 0; }

.polluted-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; cursor: pointer;
  transition: background 0.12s;
  border-bottom: 1px solid var(--border);
}
.polluted-item:hover { background: var(--surface2); }

.polluted-rank { font-size: 11px; color: var(--muted); width: 18px; flex-shrink: 0; text-align: center; }
.polluted-info { flex: 1; min-width: 0; }
.polluted-name { font-size: 12px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.polluted-city { font-size: 11px; color: var(--muted); margin-top: 2px; }
.polluted-value { font-size: 13px; font-weight: 700; flex-shrink: 0; }
.loading-msg { padding: 24px 16px; color: var(--muted); font-size: 13px; text-align: center; }

/* ── RIGHT PANEL ────────────────────────────────────────────────── */
.panel-station-name { font-size: 13px; font-weight: 600; max-width: 240px; line-height: 1.35; }
.panel-city { font-size: 11px; color: var(--muted); margin-top: 3px; }

.aqi-badge-wrap {
  display: flex; align-items: center; gap: 14px;
  padding: 16px; border-bottom: 1px solid var(--border);
  background: var(--surface2);
}
.aqi-badge { font-size: 30px; font-weight: 700; min-width: 72px; }
.aqi-label { font-size: 12px; color: var(--muted); line-height: 1.5; }

.readings-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 1px; background: var(--border);
  border-bottom: 1px solid var(--border);
}
.reading-card {
  background: var(--surface); padding: 12px 14px;
  display: flex; flex-direction: column; gap: 3px;
}
.reading-label { font-size: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.6px; }
.reading-value { font-size: 20px; font-weight: 700; }
.reading-unit  { font-size: 10px; color: var(--muted); }
.reading-ts    { font-size: 10px; color: var(--muted); margin-top: 2px; }

.chart-section { padding: 14px 16px; border-bottom: 1px solid var(--border); }
.chart-header  { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.chart-title   { font-size: 12px; font-weight: 500; color: var(--muted); }

.chart-wrap { position: relative; height: 150px; }
.chart-loading,
.chart-empty {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; color: var(--muted); background: var(--surface);
  text-align: center; padding: 12px;
}

.reference-box { padding: 14px 16px; font-size: 12px; }
.ref-title { font-size: 10px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--muted); margin-bottom: 8px; }
.ref-row { display: flex; justify-content: space-between; padding: 4px 0; border-bottom: 1px solid var(--border); color: var(--muted); }

/* ── LEGEND ─────────────────────────────────────────────────────── */
.legend {
  position: absolute;
  bottom: 22px; left: 50%; transform: translateX(-50%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 16px;
  z-index: 999;
  display: flex; align-items: center; gap: 14px;
  pointer-events: none;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}
.legend-title { font-size: 11px; color: var(--muted); white-space: nowrap; font-weight: 500; }
.legend-items { display: flex; align-items: center; gap: 10px; font-size: 11px; color: var(--muted); flex-wrap: wrap; }
.legend-dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; vertical-align: middle; margin-right: 3px; }

/* ── ANALYTICS SECTION ──────────────────────────────────────────── */
.analytics {
  padding: 52px 40px 60px;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.analytics-header { margin-bottom: 28px; }
.analytics-title  { font-size: 22px; font-weight: 700; color: var(--text); letter-spacing: -0.3px; }
.analytics-sub    { font-size: 13px; color: var(--muted); margin-top: 6px; }

/* Stat cards */
.stat-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px 20px;
  transition: border-color 0.2s;
}
.stat-card:hover { border-color: var(--accent); }

.stat-value { font-size: 32px; font-weight: 700; color: var(--text); line-height: 1; margin-bottom: 8px; }
.stat-label { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.stat-note  { font-size: 11px; color: var(--muted); }

/* Analytics charts grid */
.analytics-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

.analytics-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.analytics-card.full-width { grid-column: 1 / -1; }

.analytics-card-header { display: flex; align-items: center; justify-content: space-between; }
.analytics-card-header h3 { font-size: 14px; font-weight: 600; color: var(--text); }
.card-note { font-size: 11px; color: var(--muted); }

.analytics-chart-wrap { position: relative; height: 240px; }
.analytics-chart-wrap.tall { height: 320px; }
.analytics-chart-wrap.compare-chart-wrap { height: 280px; }

.coverage-note { font-size: 11px; color: var(--muted); line-height: 1.5; border-top: 1px solid var(--border); padding-top: 12px; }

/* Compare tool */
.compare-controls {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.compare-selects { display: flex; gap: 10px; flex-wrap: wrap; flex: 1; }
.compare-select {
  flex: 1; min-width: 180px;
  background: var(--surface2); border: 1px solid var(--border);
  color: var(--text); border-radius: 7px; padding: 8px 11px;
  font-size: 12px; cursor: pointer; outline: none;
}
.compare-select:focus { border-color: var(--accent); }

/* Data note */
.data-note {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  margin-top: 16px;
}
.data-note-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.data-note-col h4 { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 8px; }
.data-note-col p  { font-size: 12px; color: var(--muted); line-height: 1.7; }
.data-note-col strong { color: var(--text); font-weight: 600; }

/* ── LEAFLET OVERRIDES ──────────────────────────────────────────── */
.leaflet-bottom.leaflet-right { margin-bottom: 72px; margin-right: 8px; }
.leaflet-popup-content-wrapper {
  background: var(--surface2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.6);
}
.leaflet-popup-tip { background: var(--surface2); }
.leaflet-popup-content { font-size: 12px; line-height: 1.5; margin: 10px 14px; }
.popup-name { font-weight: 600; margin-bottom: 3px; font-size: 13px; }
.popup-city { color: var(--muted); font-size: 11px; margin-bottom: 6px; }
.popup-tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 6px; }
.popup-tag {
  background: var(--surface3); border-radius: 4px;
  padding: 2px 7px; font-size: 10px; color: var(--muted);
}

/* ── CHAT WIDGET ────────────────────────────────────────────────── */
#cw {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
  /* keep it away from Leaflet attribution (bottom-right of map) */
  pointer-events: none;
}

#cw > * { pointer-events: all; }

/* Bubble */
.cw__bubble {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 12px 20px 12px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(108,142,245,0.45);
  transition: transform 0.15s, box-shadow 0.15s;
}
.cw__bubble:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 26px rgba(108,142,245,0.55);
}
.cw__bubble-label { font-size: 13px; }

/* Panel — opens upward, anchored to bottom-right bubble */
.cw__panel {
  width: 360px;
  max-height: 520px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 12px 48px rgba(0,0,0,0.6);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  order: -1;           /* renders above the bubble in the flex column */

  /* Hidden by default */
  opacity: 0;
  transform: translateY(10px) scale(0.97);
  transform-origin: bottom right;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

#cw.chat-open .cw__panel {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}

/* Header */
.cw__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.cw__header-info { display: flex; align-items: center; gap: 10px; }
.cw__header-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #00c853;
  box-shadow: 0 0 6px #00c853aa;
  animation: pulse 2.5s infinite;
  flex-shrink: 0;
}
.cw__header-title { font-size: 13px; font-weight: 600; color: var(--text); }
.cw__header-sub   { font-size: 10px; color: var(--muted); margin-top: 1px; }
.cw__close {
  background: none; border: none; color: var(--muted);
  cursor: pointer; font-size: 14px; padding: 4px 8px;
  border-radius: 6px; transition: color 0.15s;
}
.cw__close:hover { color: var(--text); }

/* Messages */
.cw__messages {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
}
.cw__messages::-webkit-scrollbar { width: 4px; }
.cw__messages::-webkit-scrollbar-track { background: transparent; }
.cw__messages::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

/* Message bubbles */
.cw__msg { max-width: 88%; }
.cw__msg p { font-size: 13px; line-height: 1.55; padding: 10px 13px; border-radius: 12px; margin: 0; }

.cw__msg--ai p {
  background: var(--surface2);
  color: var(--text);
  border-radius: 4px 12px 12px 12px;
}
.cw__msg--user {
  align-self: flex-end;
}
.cw__msg--user p {
  background: var(--accent);
  color: #fff;
  border-radius: 12px 4px 12px 12px;
}
.cw__msg--error p {
  background: rgba(221,44,0,0.12);
  color: #ff6b6b;
  border-radius: 4px 12px 12px 12px;
  font-size: 12px;
}

/* Typing indicator */
.cw__typing { max-width: 88%; }
.cw__typing-dots {
  display: flex; gap: 4px; align-items: center;
  background: var(--surface2); padding: 12px 14px;
  border-radius: 4px 12px 12px 12px; width: fit-content;
}
.cw__typing-dots span {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--muted);
  animation: bounce 1.2s infinite;
}
.cw__typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.cw__typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
  40%           { transform: translateY(-5px); opacity: 1; }
}

/* Suggestion chips */
.cw__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 2px;
}
.cw__chip {
  background: var(--surface3);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 20px;
  padding: 5px 12px;
  font-size: 11px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  text-align: left;
  line-height: 1.4;
}
.cw__chip:hover { border-color: var(--accent); color: var(--text); }

/* Input footer */
.cw__footer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  background: var(--surface2);
  flex-shrink: 0;
}
.cw__input {
  flex: 1;
  background: var(--surface3);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}
.cw__input:focus { border-color: var(--accent); }
.cw__input::placeholder { color: var(--muted); }
.cw__input:disabled { opacity: 0.5; }

.cw__send {
  background: var(--accent);
  border: none;
  color: #fff;
  border-radius: 8px;
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: opacity 0.15s;
}
.cw__send:hover   { opacity: 0.85; }
.cw__send:disabled { opacity: 0.4; cursor: not-allowed; }

/* ═══════════════════════════════════════════════════════════════════
   MOBILE & TABLET RESPONSIVE
   ═══════════════════════════════════════════════════════════════════ */

/* ── Tablet (≤1024px) ───────────────────────────────────────────── */
@media (max-width: 1024px) {
  :root { --panel-w: 290px; }

  .analytics { padding: 36px 24px 48px; }
  .stat-cards { grid-template-columns: repeat(2, 1fr); }
  .data-note-inner { grid-template-columns: 1fr 1fr; gap: 20px; }
  .analytics-chart-wrap.tall { height: 280px; }
}

/* ── Mobile (≤768px) ────────────────────────────────────────────── */
@media (max-width: 768px) {
  :root { --nav-h: auto; }

  /* ── Navbar ────────────────────────────────────────────────────── */
  .navbar {
    height: auto;
    flex-wrap: wrap;
    padding: 10px 14px;
    gap: 8px;
    position: sticky;
    top: 0;
    z-index: 2000;
  }

  .nav-brand {
    flex: 1;
    font-size: 14px;
  }

  .nav-source { display: none; }

  .nav-controls {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 8px;
  }

  .search-input {
    width: 100%;
    min-width: 0;
  }

  .pollutant-select { min-width: 80px; }

  .btn-secondary {
    padding: 7px 10px;
    font-size: 12px;
    white-space: nowrap;
  }

  /* ── Map section ───────────────────────────────────────────────── */
  .map-section {
    height: 40vh;
    min-height: 240px;
  }

  /* ── Panels → bottom sheets ────────────────────────────────────── */
  .left-panel,
  .right-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100% !important;
    max-height: 62vh;
    border-radius: 18px 18px 0 0;
    border: none;
    border-top: 1px solid var(--border);
    box-shadow: 0 -8px 32px rgba(0,0,0,0.5);
    z-index: 1500;
    overflow-y: auto;
  }

  /* Drag handle at top of each sheet */
  .left-panel::before,
  .right-panel::before {
    content: '';
    display: block;
    width: 36px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    margin: 10px auto 0;
    flex-shrink: 0;
  }

  /* Backdrop behind open panels — display controlled by JS only */
  .panel-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    z-index: 1400;
  }

  /* ── Legend ─────────────────────────────────────────────────────── */
  .legend {
    bottom: 10px;
    padding: 6px 10px;
    gap: 8px;
    max-width: calc(100vw - 80px);
  }

  .legend-title { display: none; }

  .legend-items {
    gap: 6px;
    font-size: 10px;
    flex-wrap: nowrap;
    overflow-x: auto;
  }

  /* ── Analytics ──────────────────────────────────────────────────── */
  .analytics {
    padding: 28px 16px 48px;
  }

  .analytics-title { font-size: 18px; }

  .stat-cards {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 20px;
  }

  .stat-card { padding: 16px 14px; }
  .stat-value { font-size: 24px; }
  .stat-label { font-size: 12px; }

  .analytics-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .analytics-card { padding: 16px; gap: 12px; }
  .analytics-card.full-width { grid-column: 1; }

  .analytics-chart-wrap      { height: 220px; }
  .analytics-chart-wrap.tall { height: 260px; }
  .analytics-chart-wrap.compare-chart-wrap { height: 220px; }

  .compare-controls { flex-direction: column; align-items: stretch; }
  .compare-selects  { flex-direction: column; }
  .compare-select   { min-width: unset; width: 100%; }
  .btn-primary      { width: 100%; text-align: center; }

  .data-note { padding: 18px; }
  .data-note-inner {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  /* ── Right panel readings grid (2→1 col) ────────────────────────── */
  .readings-grid { grid-template-columns: 1fr 1fr; }
  .chart-wrap    { height: 140px; }

  /* ── Chat widget ─────────────────────────────────────────────────── */
  #cw {
    bottom: 16px;
    right: 16px;
  }

  .cw__panel {
    width: calc(100vw - 32px);
    max-height: 70vh;
  }

  .cw__bubble {
    padding: 11px 16px 11px 14px;
  }
}

/* ── Small phones (≤390px) ──────────────────────────────────────── */
@media (max-width: 390px) {
  .stat-cards { grid-template-columns: 1fr 1fr; }
  .stat-value  { font-size: 20px; }
  .nav-controls { grid-template-columns: 1fr auto; }
  .btn-secondary { display: none; } /* hide "Top Polluted" btn — use map tap instead */
}