:root {
    --bg: #0f172a;
    --surface: #1e293b;
    --surface-alt: #334155;
    --border: #475569;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --accent: #38bdf8;
    --accent-dim: #7dd3fc;
}

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

body {
    font-family: "Inter", system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 40px 20px;
}

.container {
    max-width: 960px;
    width: 100%;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--muted);
    font-size: 1rem;
    margin-bottom: 24px;
}

.version-bar {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px 16px;
    font-size: 0.9rem;
}

.version-bar label {
    color: var(--muted);
    font-weight: 500;
}

.version-bar select {
    background: var(--surface-alt);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 4px 10px;
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
}

.version-bar select:focus {
    border-color: var(--accent);
}

#version-badge {
    font-size: 0.75rem;
    background: var(--accent);
    color: #0f172a;
    border-radius: 999px;
    padding: 2px 8px;
    font-weight: 700;
    display: none;
}

.metrics {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 40px;
}

.metric {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 18px 28px;
    min-width: 140px;
    text-align: center;
}

.metric h3 {
    font-size: 0.8rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
}

.metric p {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.card {
    background: var(--surface);
    border: 1px solid transparent;
    border-radius: 14px;
    padding: 24px;
    text-decoration: none;
    color: var(--text);
    transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.card:hover {
    background: var(--surface-alt);
    border-color: var(--accent);
    transform: translateY(-3px);
}

.card h2 {
    font-size: 1.05rem;
    font-weight: 600;
}

.card p {
    color: var(--muted);
    font-size: 0.875rem;
}

footer {
    text-align: center;
    margin-top: 48px;
    color: var(--muted);
    font-size: 0.8rem;
}