:root {
    color-scheme: light;
    --ink: #142f36;
    --muted: #506a70;
    --blue: #1e56bf;
    --accent: #235fd2;
    --accent-hover: #1649b0;
    --soft-blue: #edf3fd;
    --teal: #126f69;
    --line: #dce7e6;
    --line-strong: #c7d6d8;
    --surface: #fff;
    --surface-soft: #f1f6f5;
    --bg: #f6f9f8;
    --header: #fff;
    --map-water: #eaf2f4;
    --map-filter: none;
    --pin: #235fd2;
    --station-pin: #245e60;
    --focus: #3c72e2;
    --shadow: 0 10px 32px #173e380c;
    --popup-shadow: 0 12px 40px #1028281f;
    --good: #46c3b4;
    --fair: #8bc970;
    --moderate: #edc953;
    --poor: #ee8d63;
    --very-poor: #df6575;
    --extreme: #a276b5;
    --series-0: #176a9e;
    --series-1: #9b4b78;
    --series-2: #8d5d16;
    --radius: 18px;
}
@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
        color-scheme: dark;
        --ink: #edf3f3;
        --muted: #b1c1c4;
        --blue: #9ebfff;
        --accent: #316bd8;
        --accent-hover: #2054bb;
        --soft-blue: #222f46;
        --teal: #86d8ce;
        --line: #394349;
        --line-strong: #54646a;
        --surface: #22272b;
        --surface-soft: #262d31;
        --bg: #181c1f;
        --header: #1d2225;
        --map-water: #232c33;
        --map-filter: invert(87%) hue-rotate(159deg) saturate(.72) brightness(1.12);
        --pin: #82acff;
        --station-pin: #84d8cb;
        --focus: #a1c2ff;
        --shadow: 0 10px 30px #10151636;
        --popup-shadow: 0 12px 40px #090e1199;
        --series-0: #8bc3ff;
        --series-1: #f0a3d0;
        --series-2: #f7ca83;
    }
}
:root[data-theme="dark"] {
    color-scheme: dark;
    --ink: #edf3f3;
    --muted: #b1c1c4;
    --blue: #9ebfff;
    --accent: #316bd8;
    --accent-hover: #2054bb;
    --soft-blue: #222f46;
    --teal: #86d8ce;
    --line: #394349;
    --line-strong: #54646a;
    --surface: #22272b;
    --surface-soft: #262d31;
    --bg: #181c1f;
    --header: #1d2225;
    --map-water: #232c33;
    --map-filter: invert(87%) hue-rotate(159deg) saturate(.72) brightness(1.12);
    --pin: #82acff;
    --station-pin: #84d8cb;
    --focus: #a1c2ff;
    --shadow: 0 10px 30px #10151636;
    --popup-shadow: 0 12px 40px #090e1199;
    --series-0: #8bc3ff;
    --series-1: #f0a3d0;
    --series-2: #f7ca83;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-padding-top: 30px; }
body {
    margin: 0;
    color: var(--ink);
    background: var(--bg);
    font: 400 15px/1.55 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    min-width: 0;
}
button, input, select { color: inherit; font: inherit; }
button, summary, select { cursor: pointer; }
button, a, select { -webkit-tap-highlight-color: transparent; }
a { color: var(--blue); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: .12em; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { font-weight: 660; line-height: 1.11; letter-spacing: -.041em; }
h1 { font-size: clamp(2.35rem, 4.4vw, 4.15rem); }
h2 { font-size: clamp(1.54rem, 2.55vw, 2.12rem); }
h3 { font-size: 1.16rem; }
small { font-size: .82em; }
main { min-height: 55vh; }
.icon { width: 19px; height: 19px; flex: none; vertical-align: middle; }
.wrap { max-width: 1200px; margin-inline: auto; padding-inline: 32px; }
.muted { color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip-link { position: absolute; inset: 10px auto auto 12px; padding: 12px; z-index: 10; background: var(--surface); transform: translateY(-180%); }
.skip-link:focus { transform: none; }
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 44px;
    padding: 9px 15px;
    border: 1px solid var(--line-strong);
    border-radius: 9px;
    background: var(--surface);
    color: var(--ink);
    font-size: .88rem;
    line-height: 1.3;
    font-weight: 620;
    text-decoration: none;
}
.button:hover { background: var(--surface-soft); }
.button.primary { border-color: var(--accent); background: var(--accent); color: #fff; }
.button.primary:hover { border-color: var(--accent-hover); background: var(--accent-hover); }
.button.subtle { color: var(--blue); border-color: transparent; background: transparent; padding-inline: 0; }
.button.subtle:hover { text-decoration: underline; }
.button:disabled { cursor: wait; opacity: .75; }
.text-link { display: inline-flex; align-items: center; gap: 7px; min-height: 35px; color: var(--blue); font-weight: 640; font-size: .88rem; text-decoration: none; }
.text-link:hover { text-decoration: underline; }
.text-link .icon { width: 16px; height: 16px; }
.tag { display: inline-flex; align-items: center; min-height: 25px; padding: 3px 8px; border-radius: 5px; background: var(--surface-soft); color: var(--muted); font-size: .73rem; font-weight: 680; line-height: 1.25; text-align: center; }
.tag-model { background: var(--soft-blue); color: var(--blue); }

.site-header { border-bottom: 1px solid var(--line); background: var(--header); }
.header-inner { display: flex; align-items: center; gap: 25px; min-height: 78px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); white-space: nowrap; text-decoration: none; }
.brand img { display: block; }
.wordmark { font-size: 1.29rem; font-weight: 730; letter-spacing: -.07em; color: var(--ink); text-decoration: none; }
.wordmark span { color: var(--blue); font-weight: 500; padding-left: 2px; }
.header-nav { display: flex; align-items: center; gap: clamp(16px, 2.25vw, 31px); margin-left: auto; }
.header-nav a, .header-menu a { color: var(--muted); font-size: .88rem; font-weight: 620; text-decoration: none; }
.header-nav a:hover, .header-nav a[aria-current], .header-menu a:hover { color: var(--blue); }
.header-actions { display: flex; align-items: center; gap: 11px; margin-left: auto; min-width: 0; }
.header-actions summary { display: flex; align-items: center; gap: 6px; min-height: 44px; list-style: none; color: var(--ink); font-size: .82rem; font-weight: 640; }
.header-actions summary::-webkit-details-marker { display: none; }
.header-actions details { position: relative; }
.header-menu { display: none; }
.language-menu .popover { width: 150px; }
.language-menu .popover a { display: flex; align-items: center; min-height: 40px; color: var(--ink); text-decoration: none; }
.language-menu .popover a:hover, .language-menu .popover a[aria-current] { color: var(--blue); text-decoration: underline; }
.popover, .header-menu nav { position: absolute; z-index: 5; right: 0; top: calc(100% + 5px); width: min(300px, 75vw); padding: 14px; border-radius: 12px; border: 1px solid var(--line); background: var(--surface); box-shadow: var(--popup-shadow); }
.popover p { margin-top: 7px; color: var(--muted); font-size: .86rem; }
.saved-list { margin: 0; padding: 0; list-style: none; }
.saved-list li { display: flex; gap: 6px; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.saved-list li:last-child { border-bottom: 0; }
.saved-list a, .saved-list button { padding-block: 8px; }
.saved-list button { border: 0; background: transparent; color: var(--blue); text-decoration: underline; font-size: .79rem; min-height: 44px; }
.theme-control { display: inline-flex; align-items: center; gap: 5px; min-height: 44px; color: var(--muted); }
.theme-control .icon { width: 16px; height: 16px; }
.theme-control select { min-height: 44px; border: 0; border-radius: 5px; color: var(--ink); background: var(--header); font-size: .84rem; font-weight: 600; }

.home-hero { display: grid; grid-template-columns: 1.14fr 1fr; align-items: center; gap: clamp(25px, 6vw, 78px); padding-block: 62px 54px; }
.hero-copy { min-width: 0; }
.hero-copy h1 { max-width: 13ch; }
.hero-copy h1 span { color: var(--blue); }
.lead { max-width: 64ch; margin-top: 15px; color: var(--muted); font-size: 1.05rem; line-height: 1.62; }
.hero-copy .lead { margin-block: 19px 22px; max-width: 46ch; }
.search-form { display: flex; align-items: center; gap: 10px; max-width: 530px; padding: 5px 5px 5px 13px; background: var(--surface); border: 1px solid var(--line-strong); border-radius: 11px; box-shadow: 0 4px 14px #173e3809; }
.search-form > .icon { color: var(--muted); }
.search-form input { flex: 1; min-width: 0; padding: 9px 0; border: 0; background: transparent; outline: none; font-size: .92rem; }
.search-form input::placeholder { color: var(--muted); }
.search-form:focus-within { outline: 2px solid var(--focus); outline-offset: 3px; }
.popular, .hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-top: 13px; }
.popular { color: var(--muted); font-size: .79rem; }
.popular a { display: inline-flex; align-items: center; min-height: 32px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 7px; color: var(--ink); background: var(--surface); text-decoration: none; }
.popular a:hover { background: var(--soft-blue); color: var(--blue); }
.hero-actions { gap: 18px; }
.hero-actions:empty { margin: 0; }
.location-result { margin-top: 6px; color: var(--muted); font-size: .9rem; }
.location-result a { font-weight: 640; }

.section { margin-top: 46px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 14px; margin-bottom: 17px; }
.section-heading p { margin-top: 7px; color: var(--muted); }
.inner-page { padding-top: 24px; }
.page-heading { margin: 24px 0 29px; }
.inner-page h1 { font-size: clamp(2.1rem, 4.4vw, 3.65rem); }
.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; margin: 0; padding: 0; list-style: none; color: var(--muted); font-size: .8rem; }
.breadcrumbs li { display: inline-flex; align-items: center; gap: 7px; }
.breadcrumbs a { color: var(--muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--blue); text-decoration: underline; }
.breadcrumbs .icon { width: 12px; height: 12px; }
.breadcrumbs [aria-current] { color: var(--ink); }
.city-heading { display: flex; justify-content: space-between; align-items: end; gap: 15px; }
.city-subtitle, .city-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-top: 11px; color: var(--muted); }
.city-subtitle .icon { width: 16px; height: 16px; }
.city-actions .button[aria-pressed="true"] { background: var(--soft-blue); color: var(--blue); }
.section-nav { display: flex; flex-wrap: wrap; gap: 3px 16px; margin-bottom: 19px; border-block: 1px solid var(--line); }
.section-nav a { min-height: 42px; padding-block: 9px; color: var(--muted); font-weight: 630; font-size: .88rem; text-decoration: none; }
.section-nav a:hover { color: var(--blue); text-decoration: underline; }
.panel, .learning-card, .map-panel { min-width: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.panel { padding: 23px; }
.panel-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.panel-header h2 { font-size: clamp(1.2rem, 2.15vw, 1.68rem); }
.panel-header > .icon { color: var(--muted); }
.panel-intro { margin-top: 11px; color: var(--muted); }
.preview-card { padding: clamp(18px, 2.4vw, 28px); border-radius: 23px; }
.preview-card .panel-header h2 { font-size: clamp(1.05rem, 2vw, 1.36rem); }
.location-caption { margin: 0 0 10px; color: var(--muted); font-size: .8rem; }
.condition-row { display: flex; align-items: center; gap: 18px; margin: 23px 0 15px; }
.condition-orbit {
    display: grid;
    place-items: center;
    flex: 0 0 78px;
    aspect-ratio: 1;
    border: 7px solid var(--line);
    border-bottom-color: var(--band, var(--line-strong));
    border-left-color: var(--band, var(--line-strong));
    border-radius: 50%;
    color: var(--teal);
    transform: rotate(-26deg);
}
.condition-orbit .icon { width: 31px; height: 31px; transform: rotate(26deg); }
.condition-name { display: block; font-weight: 660; font-size: clamp(1.6rem, 3.1vw, 2.35rem); letter-spacing: -.05em; line-height: 1.1; overflow-wrap: anywhere; }
.subtle-text { margin-top: 5px; color: var(--muted); font-size: .88rem; }
.condition-description { color: var(--muted); margin-bottom: 9px; }
.band-good { --band: var(--good); }
.band-fair { --band: var(--fair); }
.band-moderate { --band: var(--moderate); }
.band-poor { --band: var(--poor); }
.band-very-poor { --band: var(--very-poor); }
.band-extremely-poor { --band: var(--extreme); }
.aqi-scale { display: grid; grid-template-columns: repeat(6, 1fr); gap: 4px; margin-top: 12px; }
.aqi-scale span { height: 7px; border-radius: 2px; background: var(--band); }
.aqi-scale .selected { outline: 1px solid var(--ink); outline-offset: 2px; }
.scale-labels { display: flex; justify-content: space-between; gap: 8px; margin-top: 6px; color: var(--muted); font-size: .74rem; }
.data-meta { display: flex; gap: 2px 14px; flex-wrap: wrap; margin: 12px 0 1px; padding: 0; list-style: none; color: var(--muted); font-size: .81rem; }
.data-meta li { max-width: 100%; }
.data-meta li::before { content: "•"; margin-right: 6px; color: var(--teal); }
.full-link { display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 44px; padding: 9px 13px; margin-top: 12px; background: var(--soft-blue); border-radius: 8px; color: var(--blue); text-decoration: none; font-size: .9rem; font-weight: 670; }
.full-link:hover { text-decoration: underline; }
.overview-grid { display: grid; grid-template-columns: .89fr 1.1fr; align-items: stretch; gap: 18px; }
.panel-empty { display: grid; justify-items: start; align-content: center; gap: 5px; min-height: 119px; padding-block: 15px; color: var(--muted); }
.panel-empty .learning-icon { margin-bottom: 5px; }
.panel-empty strong { color: var(--ink); }
.forecast-panel .panel-empty { min-height: 148px; }
.forecast-form { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 10px; color: var(--muted); font-size: .82rem; }
.forecast-form select { min-height: 44px; padding: 4px 7px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--surface); color: var(--ink); }
.forecast-request { display: flex; flex-wrap: wrap; align-items: center; gap: 5px 12px; margin-top: 13px; }
.forecast-request p { color: var(--muted); font-size: .88rem; }

.pollutant-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; }
.pollutant-card { min-width: 0; display: block; padding: 15px 13px; border: 1px solid var(--line); border-radius: 13px; background: var(--surface); color: var(--ink); text-decoration: none; }
.pollutant-card:hover { border-color: var(--blue); background: var(--soft-blue); }
.pollutant-top { display: flex; align-items: center; justify-content: space-between; gap: 4px; }
.pollutant-top strong { font-size: 1.03rem; }
.pollutant-top .icon { width: 15px; height: 15px; color: var(--muted); }
.pollutant-name { display: block; margin: 5px 0 13px; min-height: 2.45em; color: var(--muted); font-size: .8rem; line-height: 1.3; }
.pollutant-value { display: block; font-size: 1.45rem; font-weight: 640; letter-spacing: -.04em; overflow-wrap: anywhere; }
.pollutant-value small { color: var(--muted); font-size: .7rem; font-weight: 500; letter-spacing: 0; }
.pollutant-period, .pollutant-missing { display: block; color: var(--muted); font-size: .75rem; }
.pollutant-missing { padding-block: 6px; }
.row-condition { display: inline-flex; align-items: center; gap: 6px; color: var(--ink); font-size: .78rem; font-weight: 620; }
.dot { display: inline-block; flex: 0 0 7px; width: 7px; height: 7px; border-radius: 50%; background: var(--band, var(--line-strong)); }
.stations-panel, #history { margin-top: 32px; }
.station-list { margin: 9px 0; padding: 0; list-style: none; }
.station-list li { display: flex; justify-content: space-between; gap: 14px; padding-block: 13px; border-bottom: 1px solid var(--line); }
.station-list li:last-child { border-bottom: 0; }
.station-list li a { font-weight: 650; }
.station-list small { display: block; color: var(--muted); }
.station-reading { text-align: right; }

.map-panel { overflow: hidden; }
.map-toolbar { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; padding: 12px 14px; border-bottom: 1px solid var(--line); }
.segmented { display: inline-flex; gap: 2px; padding: 3px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-soft); }
.segmented button { border: 1px solid transparent; border-radius: 5px; padding: 4px 10px; min-height: 36px; background: transparent; color: var(--muted); font-size: .8rem; font-weight: 650; }
.segmented button[aria-pressed="true"] { background: var(--surface); border-color: var(--line); color: var(--blue); }
.map-columns { display: grid; grid-template-columns: minmax(0, 2.2fr) minmax(200px, 1fr); align-items: start; }
.map-panel[data-view="list"] .map-columns { grid-template-columns: 1fr; }
.map-figure { align-self: stretch; min-width: 0; display: flex; flex-direction: column; background: var(--map-water); }
.map-art { position: relative; isolation: isolate; width: 100%; overflow: clip; }
.map-art img { display: block; width: 100%; height: auto; filter: var(--map-filter); }
.map-pins { position: absolute; inset: 0; pointer-events: none; }
.map-pin { position: absolute; width: 20px; height: 20px; z-index: 1; display: grid; place-items: center; color: var(--pin); pointer-events: auto; transform: translate(-50%, -50%); text-decoration: none; }
.map-pin::before { content: ""; display: block; width: 10px; height: 10px; border: 1.5px solid var(--surface); border-radius: 50%; background: currentColor; box-shadow: 0 0 0 2px #1d60d128; }
.station-pins .map-pin { color: var(--station-pin); }
.station-pins .map-pin::before { border-radius: 2px; }
.map-pin span { display: none; position: absolute; z-index: 1; bottom: calc(100% + 2px); left: 50%; transform: translateX(-50%); padding: 3px 6px; border: 1px solid var(--line); border-radius: 5px; background: var(--surface); color: var(--ink); white-space: nowrap; font-size: .72rem; font-weight: 700; }
.map-pin:hover, .map-pin:focus-visible { z-index: 2; }
.map-pin:hover span, .map-pin:focus-visible span { display: block; }
.map-figure figcaption { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 2px 10px; align-items: center; margin-top: auto; padding: 8px 12px; border-top: 1px solid var(--line); background: var(--surface); color: var(--muted); font-size: .74rem; }
.map-list { padding: 15px 17px; }
.map-list h3 { margin-bottom: 7px; }
.map-list > div + div:not([hidden]) { margin-top: 16px; }
.map-list > div[hidden] + div { margin-top: 0; }
.map-panel:not([data-view="list"]) .map-list > div { max-height: 360px; overflow: auto; scrollbar-gutter: stable; }
.map-panel[data-view="list"] .map-list .place-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 225px), 1fr)); gap: 0 15px; }
.place-list { margin: 0; padding: 0; list-style: none; }
.place-list li + li { border-top: 1px solid var(--line); }
.place-list a { min-height: 54px; display: flex; align-items: center; gap: 10px; padding: 6px 2px; color: var(--ink); text-decoration: none; }
.place-list a:hover .list-label strong { color: var(--blue); text-decoration: underline; }
.list-chevron { flex: 0 0 7px; width: 7px; height: 7px; margin-inline: auto 4px; border-top: 1.5px solid var(--muted); border-right: 1.5px solid var(--muted); transform: rotate(45deg); }
.place-list .list-label { min-width: 0; overflow-wrap: anywhere; }
.list-label small { display: block; color: var(--muted); }
.list-icon { display: grid; place-items: center; flex: 0 0 31px; width: 31px; height: 31px; border-radius: 8px; background: var(--surface-soft); color: var(--teal); }
.list-icon::before { content: ""; width: 17px; height: 17px; background: currentColor; mask: url("/assets/place-pin.svg") center/contain no-repeat; }
.list-icon-globe::before { mask-image: url("/assets/place-globe.svg"); }
.place-list.compact a { gap: 7px; font-size: .86rem; }
.place-list.compact .row-condition { display: none; }
.place-list:not(.compact) { max-width: 790px; }

.chart { margin-top: 11px; }
.chart-heading, .chart-foot { display: flex; align-items: center; flex-wrap: wrap; justify-content: space-between; gap: 2px 9px; color: var(--muted); font-size: .79rem; }
.chart-heading strong { color: var(--ink); font-size: .86rem; }
.chart-art { display: block; margin-top: 4px; width: 100%; height: auto; min-height: 94px; overflow: visible; }
.chart-grid-line { stroke: var(--line-strong); stroke-width: 1; }
.chart-axis { fill: var(--muted); font-size: 12px; }
.chart-series path { fill: none; stroke: var(--series); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.chart-series circle { fill: var(--series); }
.series-0 { --series: var(--series-0); }
.series-1 { --series: var(--series-1); }
.series-2 { --series: var(--series-2); }
.chart-series.series-1 path { stroke-dasharray: 6 4; }
.chart-series.series-2 path { stroke-dasharray: 2 4; }
.chart-legend { display: flex; gap: 7px 15px; flex-wrap: wrap; margin: 8px 0; padding: 0; list-style: none; }
.chart-legend li { display: flex; align-items: center; gap: 7px; font-size: .83rem; }
.chart-legend i { display: inline-block; width: 20px; border-top: 3px solid var(--series); }
.chart-legend i.series-1 { border-top-style: dashed; }
.chart-legend i.series-2 { border-top-style: dotted; }
.chart-values { margin-top: 7px; }
.chart-values summary { padding-block: 8px; color: var(--blue); font-weight: 630; font-size: .83rem; }
.chart-values > .table-scroll { max-height: 320px; }
.longer-forecast { margin-top: 8px; border-top: 1px solid var(--line); }
.table-scroll { overflow: auto; max-width: 100%; border: 1px solid var(--line); border-radius: 10px; margin-top: 11px; background: var(--surface); }
.table-scroll-wide table { min-width: 625px; }
table { width: 100%; border-collapse: collapse; font-size: .88rem; text-align: left; }
caption { padding: 9px 12px; color: var(--muted); font-size: .81rem; text-align: left; }
th, td { padding: 9px 12px; vertical-align: top; border-bottom: 1px solid var(--line); }
thead { background: var(--surface-soft); }
thead th { white-space: nowrap; }
tbody tr:last-child > * { border-bottom: 0; }
th { font-weight: 650; }
tbody time { white-space: nowrap; }

.learning-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
.learning-card { display: flex; flex-direction: column; align-items: flex-start; padding: 19px; }
.learning-icon { display: inline-grid; flex: 0 0 auto; place-items: center; width: 40px; height: 40px; border-radius: 10px; background: var(--soft-blue); color: var(--blue); }
.learning-card h3 { margin-top: 13px; }
.learning-card p { flex: 1; margin: 7px 0 9px; color: var(--muted); }
.data-strip, .comparison-strip { display: flex; justify-content: space-between; align-items: center; gap: 16px 25px; padding: 21px 23px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface-soft); }
.data-strip { margin-top: 36px; }
.data-strip h2, .comparison-strip h2 { font-size: clamp(1.1rem, 2.4vw, 1.55rem); }
.comparison-strip p { margin-top: 5px; color: var(--muted); }
.source-names { display: flex; flex-wrap: wrap; gap: 12px clamp(12px, 3vw, 35px); }
.source-names span { display: block; color: var(--ink); font-weight: 700; letter-spacing: -.03em; }
.source-names small { display: block; color: var(--muted); font-weight: 450; letter-spacing: 0; }

.editorial { max-width: 905px; }
.editorial-notice { max-width: 905px; margin-top: 17px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--muted); font-size: .89rem; }
.content-block h2 { font-size: clamp(1.28rem, 2.3vw, 1.78rem); }
.content-block p { max-width: 74ch; margin-top: 10px; }
.editorial .content-block + .content-block { margin-top: 30px; }
.link-list { display: flex; flex-wrap: wrap; column-gap: 24px; row-gap: 4px; margin: 11px 0 0; padding: 0; list-style: none; font-size: .9rem; }
.link-list a { display: inline-flex; align-items: center; min-height: 32px; }
.editorial-related { margin-top: 35px; padding-top: 18px; border-top: 1px solid var(--line); }
.editorial-related h2 { font-size: 1.22rem; }
.pollutant-directory { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-bottom: 28px; }
.pollutant-directory a { min-height: 62px; display: flex; flex-wrap: wrap; align-items: center; gap: 7px; padding: 8px 11px; border: 1px solid var(--line); border-radius: 9px; background: var(--surface); color: var(--ink); text-decoration: none; }
.pollutant-directory a:hover { background: var(--soft-blue); color: var(--blue); }
.pollutant-directory a span { color: var(--muted); font-size: .82rem; }
.pollutant-directory .icon { width: 16px; height: 16px; margin-left: auto; color: var(--blue); }
.empty-state { display: flex; flex-wrap: wrap; align-items: center; gap: 11px; padding: 16px; border: 1px solid var(--line); border-radius: 13px; background: var(--surface); }
.empty-state p { color: var(--muted); }
.empty-state .button { margin-left: auto; }
.compare-fields { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 13px; }
.field label { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 3px 8px; margin-bottom: 5px; font-weight: 650; font-size: .86rem; }
.field label span { color: var(--muted); font-weight: 450; }
.field select { width: 100%; min-height: 44px; padding: 7px 9px; border: 1px solid var(--line-strong); border-radius: 8px; background: var(--surface); }
.compare-actions { display: flex; gap: 9px; margin-top: 16px; }
.comparison-result { max-width: 915px; }
.comparison-sources { margin: 10px 0 0; padding-left: 18px; color: var(--muted); font-size: .87rem; }
.coverage-counts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.coverage-counts > div { display: flex; flex-direction: column-reverse; align-items: flex-start; padding: 15px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.coverage-counts dt { color: var(--muted); }
.coverage-counts dd { margin: 0; color: var(--ink); font-weight: 700; font-size: 1.68rem; }

.site-footer { margin-top: 58px; background: var(--header); border-top: 1px solid var(--line); }
.footer-main, .footer-bottom { display: flex; justify-content: space-between; align-items: start; gap: 12px 18px; }
.footer-main { padding-block: 23px; }
.footer-main p { margin-top: 4px; color: var(--muted); font-size: .83rem; }
.footer-links { display: flex; align-items: center; flex-wrap: wrap; justify-content: flex-end; gap: 1px 15px; }
.footer-links a { display: inline-flex; align-items: center; min-height: 36px; color: var(--muted); text-decoration: none; font-size: .86rem; font-weight: 590; }
.footer-links a:hover { color: var(--blue); text-decoration: underline; }
.footer-bottom { padding-block: 12px; border-top: 1px solid var(--line); color: var(--muted); font-size: .8rem; }
.toast { position: fixed; z-index: 8; right: 15px; bottom: 15px; max-width: calc(100% - 30px); padding: 11px 14px; border-radius: 9px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink); box-shadow: var(--popup-shadow); }

@media (max-width: 920px) {
    .header-inner { gap: 15px; }
    .header-nav { gap: 15px; }
    .header-actions { gap: 8px; }
    .home-hero { gap: 30px; }
    .pollutant-grid { grid-template-columns: repeat(3, 1fr); }
    .pollutant-name { min-height: unset; }
    .compare-fields { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 735px) {
    .wrap { padding-inline: 19px; }
    .header-inner { min-height: 64px; gap: 10px; }
    .header-nav { display: none; }
    .header-menu { display: block; }
    .header-menu nav { width: 154px; }
    .header-menu nav a { display: flex; align-items: center; min-height: 42px; }
    .home-hero { grid-template-columns: minmax(0, 1fr); gap: 21px; padding-block: 37px 27px; }
    .hero-copy h1 { max-width: 15ch; overflow-wrap: anywhere; }
    .lead { font-size: .98rem; }
    .overview-grid { grid-template-columns: 1fr; gap: 12px; }
    .city-heading { align-items: start; flex-direction: column; gap: 5px; }
    .city-actions { margin-top: 3px; }
    .section { margin-top: 34px; }
    .section-heading { align-items: start; flex-wrap: wrap; }
    .map-columns { grid-template-columns: 1fr; }
    .map-panel:not([data-view="list"]) .map-list > div { max-height: none; }
    .learning-grid { grid-template-columns: 1fr; gap: 10px; }
    .data-strip, .comparison-strip { flex-wrap: wrap; }
    .footer-main { flex-direction: column; }
    .footer-links { justify-content: flex-start; }
}
@media (max-width: 435px) {
    .wrap { padding-inline: 13px; }
    .header-inner { gap: 5px; }
    .brand { gap: 7px; }
    .brand img { width: 32px; height: 32px; }
    .wordmark { font-size: 1.12rem; }
    .header-actions { gap: 4px; }
    .header-actions summary span, .theme-control > .icon { display: none; }
    .header-actions summary { justify-content: center; width: 30px; }
    .theme-control select { max-width: 69px; }
    .panel { padding: 16px; }
    .pollutant-grid { grid-template-columns: repeat(2, 1fr); }
    .pollutant-directory { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .compare-fields { grid-template-columns: 1fr; }
    .coverage-counts { grid-template-columns: 1fr; }
    .chart-axis { font-size: 15px; }
    .map-pin::before { width: 8px; height: 8px; }
    .station-list li { gap: 7px; }
}
@media (max-width: 360px) {
    .brand img { width: 27px; height: 27px; }
    .brand { gap: 5px; }
    .header-actions summary { width: 28px; }
    .search-form { gap: 5px; padding-left: 7px; }
    .search-form .button { padding-inline: 9px; }
    .condition-row { gap: 12px; }
    .condition-orbit { flex-basis: 56px; border-width: 5px; }
}