* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    font-family: "Segoe UI", Arial, sans-serif;
    color: #fff;
    background: #0d0818;
}

body {
    min-height: 100vh;
    background:
        radial-gradient(
            circle at top,
            #5a2a82 0%,
            #2d1348 34%,
            #160b29 72%,
            #0d0818 100%
        );
    padding: 24px 16px 40px;
}

button {
    font: inherit;
}

.page-shell {
    width: min(1040px, 100%);
    margin: auto;
}

.hero {
    position: relative;
    text-align: center;
    padding: 28px 10px 18px;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    letter-spacing: 2px;
    margin: 10px 0 6px;
}

.hero p {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    opacity: .72;
}

.language-switch {
    position: absolute;
    top: 0;
    right: 0;

    display: flex;
    align-items: center;
    gap: 7px;

    padding: 6px 10px;

    border: 1px solid rgba(255,255,255,.14);
    border-radius: 10px;

    background: rgba(255,255,255,.045);

    color: rgba(255,255,255,.62);
}

.language-option {
    border: 0;
    background: transparent;
    color: inherit;

    padding: 3px 2px;

    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .7px;

    cursor: pointer;
}

.language-option:hover {
    color: #fff;
}

.language-option.active {
    color: #fff;
}

.language-divider {
    opacity: .35;
}

.location-card,
.main-card,
.station-card,
.explain-card,
.error-card,
.timestamps,
.info-card {
    background: rgba(255,255,255,.065);
    border: 1px solid rgba(255,255,255,.12);

    box-shadow:
        0 0 28px rgba(0,0,0,.25),
        inset 0 0 20px rgba(255,255,255,.02);

    backdrop-filter: blur(12px);
}

.location-card {
    display: flex;
    align-items: center;
    gap: 14px;

    width: min(720px, 100%);
    margin: 10px auto 18px;

    padding: 16px 20px;

    border-radius: 18px;
}

.location-icon {
    font-size: 1.7rem;
}

.location-capital {
    font-size: 1.15rem;
    font-weight: 700;
}

.location-country {
    opacity: .65;
    margin-top: 2px;
}

.main-card {
    text-align: center;
    border-radius: 26px;
    padding: 30px 20px 26px;
}

.aqi-emoji {
    font-size: 4.2rem;
    line-height: 1.1;
}

.aqi-value {
    font-size: clamp(4rem, 12vw, 7rem);
    font-weight: 800;
    line-height: 1;
    margin: 8px 0 0;
}

.aqi-unit {
    font-size: .95rem;
    letter-spacing: 3px;
    opacity: .65;
    text-transform: uppercase;
}

.status-pill {
    display: inline-block;
    margin-top: 16px;
    padding: 9px 18px;
    border-radius: 999px;

    font-weight: 800;
    letter-spacing: 1px;
}

.status-description {
    max-width: 650px;
    margin: 12px auto 0;
    line-height: 1.55;
    opacity: .82;
}

.freshness {
    margin-top: 16px;
    font-size: .9rem;
    opacity: .8;
}

.freshness.fresh {
    color: #7fffb5;
}

.freshness.stale {
    color: #ffd36a;
}

.freshness.old,
.freshness.unknown {
    color: #ff9a9a;
}

.grid-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    margin-top: 16px;
}

.info-card {
    border-radius: 18px;
    padding: 17px;

    display: flex;
    align-items: center;
    gap: 13px;
}

.info-card > span {
    font-size: 1.35rem;
    min-width: 38px;
    text-align: center;
}

.info-card div {
    display: grid;
    grid-template-columns: auto auto;
    column-gap: 8px;
    align-items: baseline;
}

.info-card small {
    grid-column: 1 / -1;
    opacity: .62;
    font-size: .78rem;
}

.info-card strong {
    font-size: 1.35rem;
}

.info-card em {
    font-style: normal;
    font-size: .72rem;
    opacity: .55;
}

.station-card {
    margin-top: 16px;
    border-radius: 18px;
    padding: 20px;
}

.section-heading {
    font-size: .9rem;
    opacity: .7;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.station-name {
    font-size: 1.3rem;
    font-weight: 700;
    margin-top: 8px;
}

.station-meta {
    margin-top: 5px;
    opacity: .65;
}

.timestamps {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;

    margin-top: 16px;
    border-radius: 18px;
    padding: 15px;
}

.timestamps div {
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-align: center;
}

.timestamps span {
    font-size: .75rem;
    opacity: .55;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.timestamps strong {
    font-size: .92rem;
}

.explain-card {
    margin-top: 16px;
    border-radius: 18px;
    overflow: hidden;
}

.explain-toggle {
    width: 100%;
    border: 0;
    background: transparent;
    color: #fff;

    padding: 17px 20px;

    display: flex;
    align-items: center;
    justify-content: space-between;

    cursor: pointer;
}

.explain-toggle > span:first-child {
    display: flex;
    align-items: center;
    gap: 6px;
}

.explain-toggle > span:last-child {
    opacity: .5;
}

.explanation {
    padding: 0 20px 20px;
}

.explanation h2 {
    font-size: 1.3rem;
    margin-bottom: 6px;
}

.explanation p {
    line-height: 1.55;
    opacity: .8;
}

.categories {
    display: grid;
    gap: 7px;
    margin-top: 14px;
}

.category-row {
    display: flex;
    align-items: center;
    justify-content: space-between;

    padding: 8px 10px;

    border-radius: 10px;
    background: rgba(255,255,255,.05);

    font-size: .85rem;
}

.category-row span:first-child {
    font-weight: 700;
}

.error-card {
    margin-top: 16px;
    border-radius: 18px;
    padding: 18px;
    border-color: rgba(255,140,140,.28);
}

.error-card strong {
    display: block;
}

.error-card p {
    margin-top: 6px;
    opacity: .78;
}

.error-card div {
    margin-top: 8px;
    font-size: .8rem;
    opacity: .65;
}

.source-footer {
    text-align: center;
    padding: 22px 8px 0;

    font-size: .78rem;
    opacity: .55;

    line-height: 1.7;
}

.source-footer a {
    color: inherit;
}

.page-load {
    font-size: .7rem;
    margin-top: 5px;
}

.status-pill.good {
    background: rgba(0,190,100,.16);
    color: #8dffbd;
}

.status-pill.moderate {
    background: rgba(245,190,0,.16);
    color: #ffe58a;
}

.status-pill.unhealthy {
    background: rgba(255,130,40,.16);
    color: #ffc08a;
}

.status-pill.very-unhealthy {
    background: rgba(245,60,60,.16);
    color: #ff9d9d;
}

.status-pill.hazardous {
    background: rgba(180,90,210,.18);
    color: #e6b8ff;
}

@media (max-width: 720px) {

    body {
        padding: 12px 10px 30px;
    }

    .hero {
        padding-top: 58px;
    }

    .language-switch {
        top: 8px;
        right: 8px;
    }

    .grid-section {
        grid-template-columns: repeat(2, 1fr);
    }

    .info-card {
        padding: 14px;
    }

    .timestamps {
        grid-template-columns: 1fr;
    }

    .aqi-emoji {
        font-size: 3.6rem;
    }
}

@media (max-width: 430px) {

    .grid-section {
        grid-template-columns: 1fr;
    }

    .location-card {
        padding: 14px 15px;
    }

    .main-card {
        padding: 25px 14px;
    }

    .hero h1 {
        letter-spacing: 1px;
    }

    .aqi-value {
        font-size: 5rem;
    }
}

@media (prefers-reduced-motion: reduce) {

    * {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}