:root {
    color-scheme: light;
    --bg: #f4f5f7;
    --card-bg: #ffffff;
    --text: #1a1d23;
    --muted: #6b7280;
    --accent: #0a3d62;
    --border: #e5e7eb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    padding: 24px 16px;
}

.card {
    width: 100%;
    max-width: 480px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 40px 32px;
    text-align: center;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
}

.eyebrow {
    margin: 0 0 8px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: var(--muted);
}

.unit-label {
    margin: 0;
    font-size: 16px;
    color: var(--muted);
}

.rate {
    margin: 8px 0 24px;
    font-size: clamp(2.5rem, 12vw, 4rem);
    font-weight: 800;
    color: var(--accent);
    line-height: 1.1;
    word-break: break-word;
}

.rate-empty {
    font-size: 1.6rem;
    color: var(--muted);
}

.meta {
    margin-bottom: 20px;
}

.meta-label {
    margin: 0;
    font-size: 13px;
    color: var(--muted);
}

.meta-value {
    margin: 2px 0 0;
    font-size: 18px;
    font-weight: 600;
}

.updated {
    margin: 0 0 24px;
    font-size: 13px;
    color: var(--muted);
}

.api-hint {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--muted);
    background: var(--bg);
    border-radius: 999px;
    padding: 6px 14px;
    margin-bottom: 16px;
}

.api-hint code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.source-link {
    display: block;
    font-size: 13px;
    color: var(--accent);
    text-decoration: none;
}

.source-link:hover {
    text-decoration: underline;
}

.disclaimer {
    margin-top: 24px;
    max-width: 480px;
    text-align: center;
    font-size: 11px;
    color: var(--muted);
    padding: 0 16px;
}

.disclaimer a {
    color: var(--muted);
}

@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
        --bg: #14161a;
        --card-bg: #1c1f26;
        --text: #f3f4f6;
        --muted: #9ca3af;
        --accent: #4da3ff;
        --border: #2a2e37;
    }
}