:root {
    color-scheme: dark;
    --background: #10151b;
    --card: #181f27;
    --card-raised: #202a34;
    --text: #f3f6f4;
    --muted: #a4b0b7;
    --line: rgba(205, 221, 226, 0.14);
    --accent: #b8f56b;
    --accent-dark: #1f351a;
}

* {
    box-sizing: border-box;
}

body {
    min-width: 320px;
    min-height: 100vh;
    margin: 0;
    color: var(--text);
    background:
        radial-gradient(circle at 15% 15%, rgba(184, 245, 107, 0.08), transparent 32%),
        var(--background);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell {
    display: grid;
    min-height: 100vh;
    padding: 32px 20px;
    place-items: center;
}

.card {
    width: min(100%, 620px);
    padding: 48px;
    border: 1px solid var(--line);
    border-radius: 28px;
    background: linear-gradient(145deg, rgba(32, 42, 52, 0.96), rgba(24, 31, 39, 0.96));
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
}

.eyebrow,
.status,
.meta-label,
.reading-label {
    color: var(--muted);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.eyebrow {
    display: flex;
    align-items: center;
    gap: 10px;
}

.eyebrow-mark,
.status-dot {
    display: inline-block;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 16px rgba(184, 245, 107, 0.7);
}

h1 {
    max-width: 10ch;
    margin: 24px 0 14px;
    font-size: clamp(2.8rem, 8vw, 5rem);
    letter-spacing: -0.07em;
    line-height: 0.92;
}

h1 span {
    color: var(--accent);
}

.intro {
    max-width: 44ch;
    margin: 0;
    color: var(--muted);
    font-size: 1rem;
    line-height: 1.6;
}

.reading {
    margin: 42px 0 28px;
    padding: 24px;
    border-radius: 18px;
    background: rgba(16, 21, 27, 0.72);
}

.reading-label {
    margin: 0 0 12px;
}

.pace-value {
    margin: 0;
    color: var(--text);
    font-size: clamp(2.5rem, 9vw, 4.6rem);
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.06em;
    line-height: 1;
}

.meta {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--line);
}

.meta-item {
    display: grid;
    gap: 8px;
}

.meta-label {
    font-size: 0.68rem;
}

.meta-item strong {
    font-size: 0.9rem;
    font-weight: 600;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-top: 22px;
}

.card-footer p {
    margin: 0;
}

#last-calculation {
    color: var(--muted);
    font-size: 0.82rem;
}

.status {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
    font-size: 0.66rem;
    white-space: nowrap;
}

.status[data-state="error"] {
    color: #ff9a90;
}

.status[data-state="error"] .status-dot {
    background: #ff9a90;
    box-shadow: 0 0 16px rgba(255, 154, 144, 0.7);
}

@media (max-width: 600px) {
    .shell {
        padding: 16px;
    }

    .card {
        padding: 28px 22px;
        border-radius: 22px;
    }

    .reading {
        margin-top: 32px;
        padding: 20px 16px;
    }

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

    .card-footer {
        align-items: flex-start;
        flex-direction: column;
    }
}