/* ==========================================================================
   Kryochamber — shared design system
   Single accent colour drives the whole palette: change --accent to re-brand.
   ========================================================================== */

:root {
    --bg: #0a0c0e;
    --bg-glow: rgba(116, 198, 221, 0.06);
    --surface: #101418;
    --surface-hover: #141a1f;
    --border: #1e242b;
    --border-strong: #2b333c;

    --text: #eef1f4;
    --muted: #98a2ad;
    --faint: #6b747e;

    --accent: #74c6dd;
    --accent-strong: #a8dcec;
    --accent-dim: rgba(116, 198, 221, 0.32);
    --accent-wash: rgba(116, 198, 221, 0.08);

    --danger: #e0806f;

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Inter,
        'Helvetica Neue', Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas,
        'Liberation Mono', monospace;

    --radius: 10px;
    --radius-sm: 8px;
    --shell: 1080px;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    -webkit-text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    background-image: radial-gradient(
        120% 70% at 50% -10%,
        var(--bg-glow) 0%,
        transparent 60%
    );
    background-repeat: no-repeat;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}

svg {
    display: block;
    flex: none;
}

/* --------------------------------------------------------------- structure */

.shell {
    max-width: var(--shell);
    margin: 0 auto;
    padding: 0 clamp(1.25rem, 4vw, 2.5rem);
}

.site-header {
    border-bottom: 1px solid var(--border);
    background: rgba(10, 12, 14, 0.72);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 20;
}

.site-header .shell {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    height: 64px;
}

.wordmark {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.wordmark .mark {
    display: grid;
    place-items: center;
    width: 30px;
    height: 30px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: var(--accent-wash);
    color: var(--accent);
}

.header-meta {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    color: var(--faint);
}

.header-link {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    color: var(--muted);
    transition: color 0.15s var(--ease);
}

.header-link:hover {
    color: var(--accent);
}

main {
    padding: clamp(3rem, 8vw, 5.5rem) 0 4rem;
}

/* -------------------------------------------------------------------- hero */

.hero {
    max-width: 34rem;
    margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.eyebrow {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1rem;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 2.9rem);
    line-height: 1.1;
    font-weight: 600;
    letter-spacing: -0.025em;
}

.hero p {
    margin-top: 1.1rem;
    font-size: 1.05rem;
    color: var(--muted);
    text-wrap: pretty;
}

/* ---------------------------------------------------------------- sections */

.section + .section {
    margin-top: clamp(2.5rem, 5vw, 3.5rem);
}

.section-label {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    font-weight: 500;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--faint);
}

.section-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(258px, 1fr));
    gap: 1rem;
}

/* ------------------------------------------------------------------- cards */

.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 168px;
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
    transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease),
        transform 0.18s var(--ease);
}

.card:hover {
    border-color: var(--accent-dim);
    background: var(--surface-hover);
    transform: translateY(-2px);
}

.card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.card-icon {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: var(--accent-wash);
    color: var(--accent);
    transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.card:hover .card-icon {
    color: var(--accent-strong);
    border-color: var(--accent-dim);
}

.card-arrow {
    color: var(--faint);
    transition: color 0.18s var(--ease), transform 0.18s var(--ease);
}

.card:hover .card-arrow {
    color: var(--accent);
    transform: translate(2px, -2px);
}

.card-title {
    font-size: 1.02rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.card-desc {
    margin-top: 0.3rem;
    font-size: 0.88rem;
    line-height: 1.5;
    color: var(--muted);
    text-wrap: pretty;
}

.card-host {
    margin-top: auto;
    padding-top: 1rem;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.01em;
    color: var(--faint);
    overflow-wrap: anywhere;
}

/* ------------------------------------------------------------------ footer */

.site-footer {
    border-top: 1px solid var(--border);
    padding: 2rem 0 3rem;
}

.site-footer .shell {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.76rem;
    letter-spacing: 0.03em;
    color: var(--faint);
}

/* ============================================================ weather page */

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    padding: 0.5rem 0.9rem 0.5rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    font-size: 0.85rem;
    color: var(--muted);
    transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.back-link:hover {
    border-color: var(--accent-dim);
    color: var(--text);
}

.weather-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

.weather-card {
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface);
}

.weather-card header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.city-name {
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.city-region {
    display: block;
    margin-top: 0.15rem;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--faint);
}

.condition-icon {
    color: var(--accent);
}

.reading {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    padding: 1.5rem 0 0.25rem;
}

.temperature {
    font-size: clamp(2.75rem, 8vw, 3.4rem);
    font-weight: 300;
    line-height: 1;
    letter-spacing: -0.04em;
    font-variant-numeric: tabular-nums;
}

.description {
    font-size: 0.95rem;
    color: var(--muted);
    text-transform: capitalize;
}

.metrics {
    margin-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.metric {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border);
}

.metric:last-child {
    border-bottom: 0;
}

.metric dt {
    font-size: 0.85rem;
    color: var(--muted);
}

.metric dd {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-variant-numeric: tabular-nums;
    color: var(--text);
}

.summary {
    margin-top: 1rem;
    padding: 1.25rem 1.5rem;
    border: 1px solid var(--border);
    border-left: 2px solid var(--accent-dim);
    border-radius: var(--radius);
    background: var(--surface);
}

.summary .section-label {
    margin-bottom: 0.5rem;
}

.summary p {
    font-size: 1.02rem;
    color: var(--text);
}

.is-loading {
    color: var(--faint);
}

.error {
    margin-top: 1.25rem;
    padding: 0.75rem 0.9rem;
    border: 1px solid rgba(224, 128, 111, 0.3);
    border-radius: var(--radius-sm);
    background: rgba(224, 128, 111, 0.08);
    font-size: 0.88rem;
    color: var(--danger);
}

.timestamp {
    margin-top: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.74rem;
    letter-spacing: 0.03em;
    color: var(--faint);
}

/* ----------------------------------------------------------------- utility */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
}

@media (max-width: 560px) {
    .site-header .shell {
        height: 58px;
    }

    .header-meta {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}