:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;--bg: #0a0a0a;--surface: rgba(255, 255, 255, .03);--surface-hover: rgba(255, 255, 255, .06);--border: rgba(255, 255, 255, .08);--border-hover: rgba(255, 255, 255, .15);--text: #fafafa;--text-muted: rgba(255, 255, 255, .5);--text-dim: rgba(255, 255, 255, .35);--radius: .75rem;--radius-sm: .5rem}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:var(--bg);color:var(--text)}.app{max-width:1280px;margin:0 auto;padding:1.5rem;display:flex;flex-direction:column;gap:1.5rem;min-height:100vh}.header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem;padding-bottom:1.25rem;border-bottom:1px solid var(--border)}.header__brand{display:flex;align-items:center;gap:.75rem}.header__title{margin:0;font-size:1.35rem;font-weight:700;letter-spacing:-.03em}.header__sub{margin:0;font-size:.78rem;color:var(--text-muted)}.header__meta{display:flex;align-items:center;gap:1rem;font-size:.8rem;color:var(--text-muted)}.header__status{display:flex;align-items:center;gap:.4rem;color:#22c55e;font-weight:500}.header__dot{width:6px;height:6px;border-radius:50%;background:#22c55e;animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}.cities-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:.75rem}.city-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;cursor:pointer;transition:all .2s ease;text-align:left;font:inherit;color:inherit}.city-card:hover{background:var(--surface-hover);border-color:var(--border-hover);transform:translateY(-1px)}.city-card--selected{background:var(--surface-hover);border-width:1.5px}.city-card__header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:.5rem}.city-card__name{margin:0;font-size:1rem;font-weight:600}.city-card__country{font-size:.72rem;color:var(--text-muted)}.city-card__aqi{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:1.15rem;font-weight:700;padding:.2rem .5rem;border-radius:var(--radius-sm);line-height:1}.city-card__level{display:flex;align-items:center;gap:.4rem;font-size:.72rem;font-weight:500}.city-card__dot{width:6px;height:6px;border-radius:50%;flex-shrink:0}.dashboard{display:grid;grid-template-columns:340px 1fr;grid-template-rows:auto auto;gap:1rem}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem}.panel__title{margin:0 0 1rem;font-size:.85rem;font-weight:600;letter-spacing:-.01em;color:#fffc;text-transform:uppercase;letter-spacing:.04em;font-size:.72rem}.panel--gauge{display:flex;flex-direction:column;align-items:center;text-align:center;grid-row:1 / 3}.panel--gauge .panel__title{align-self:flex-start;width:100%}.aqi-gauge{margin:.5rem 0}.panel__status{display:inline-block;padding:.3rem .75rem;border-radius:2rem;font-size:.78rem;font-weight:600;margin-bottom:.75rem}.panel__desc{margin:0 0 1.25rem;font-size:.82rem;color:var(--text-muted);line-height:1.6;max-width:280px}.aqi-legend{display:grid;grid-template-columns:1fr 1fr;gap:.4rem;width:100%;margin-top:auto;padding-top:1rem;border-top:1px solid var(--border)}.aqi-legend__item{display:flex;align-items:center;gap:.4rem;font-size:.68rem}.aqi-legend__swatch{width:10px;height:10px;border-radius:2px;flex-shrink:0}.aqi-legend__label{color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.aqi-legend__range{color:var(--text-dim);margin-left:auto;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.62rem}.panel--pollutants{overflow:hidden}.pollutants-list{display:flex;flex-direction:column;gap:.85rem}.pollutant-bar__header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.35rem}.pollutant-bar__name{display:flex;align-items:baseline;gap:.5rem}.pollutant-bar__symbol{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.82rem;font-weight:600;color:var(--text)}.pollutant-bar__full{font-size:.72rem;color:var(--text-muted)}.pollutant-bar__values{display:flex;align-items:center;gap:.6rem}.pollutant-bar__value{font-size:.78rem;color:var(--text-muted);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.pollutant-bar__value small{font-size:.65rem;color:var(--text-dim)}.pollutant-bar__aqi{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.72rem;font-weight:600;padding:.15rem .45rem;border-radius:.3rem;min-width:36px;text-align:center}.pollutant-bar__track{height:5px;background:#ffffff0f;border-radius:3px;overflow:hidden}.pollutant-bar__fill{height:100%;border-radius:3px;transition:width .6s ease}.panel--trend{display:flex;flex-direction:column}.trend-chart{flex:1;display:flex;flex-direction:column;justify-content:flex-end}.trend-chart__labels{display:flex;justify-content:space-between;margin-top:.5rem;font-size:.62rem;color:var(--text-dim);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.footer{display:flex;justify-content:space-between;padding-top:1rem;border-top:1px solid var(--border);font-size:.72rem;color:var(--text-dim);margin-top:auto}@media(max-width:860px){.dashboard{grid-template-columns:1fr;grid-template-rows:auto}.panel--gauge{grid-row:auto}.cities-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}}@media(max-width:480px){.app{padding:1rem;gap:1rem}.cities-grid{grid-template-columns:1fr 1fr}.header{flex-direction:column;align-items:flex-start}.aqi-legend{grid-template-columns:1fr}}