:root {
    --bg-main: #020617;
    --bg-card: #020617;
    --text-main: #e5e7eb;
    --text-muted: #94a3b8;
    --radius: 14px;
    --transition: 0.35s ease;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at top, #020617 0%, #000 70%);
    font-family: system-ui, -apple-system, Segoe UI, sans-serif;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    align-items: center;
}

header {
    text-align: center;
    margin: 48px 16px 32px;
}

header h1 {
    margin: 0;
    font-size: 2rem;
    font-weight: 600;
}

header p {
    margin-top: 8px;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.menu {
    width: min(1100px, 92%);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    padding-bottom: 48px;
}

.menu a {
    position: relative;
    padding: 28px;
    border-radius: var(--radius);
    background: var(--bg-card);
    text-decoration: none;
    color: inherit;
    overflow: hidden;
    transition:
        transform var(--transition),
        box-shadow var(--transition),
        background var(--transition);
}

.menu a::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(
        120deg,
        transparent 20%,
        var(--accent),
        transparent 80%
    );
    opacity: 0;
    transition: opacity var(--transition);
}

.menu a:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.55);
}

.menu a:hover::before {
    opacity: 0.25;
}

.menu h2 {
    margin: 0;
    font-size: 1.2rem;
    font-weight: 500;
    position: relative;
    z-index: 1;
}

.menu span {
    display: block;
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--text-muted);
    position: relative;
    z-index: 1;
}

/* indikace nového tabu */
.menu a[data-blank="1"]::after {
    content: "↗";
    position: absolute;
    top: 16px;
    right: 18px;
    font-size: 0.85rem;
    opacity: 0.4;
}

footer {
    margin-top: auto;
    padding: 24px 0;
    font-size: 0.75rem;
    color: var(--text-muted);
    opacity: 0.6;
}