:root {
    --bg: #f3f4f6;
    --card: #ffffff;
    --primary: #0d47a1;
    --text: #1b1e23;
    --muted: #6c757d;
    --radius: 10px;
    --shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 6px 16px rgba(0, 0, 0, 0.12);
}

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

body {
    font-family: system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: var(--primary);
    color: #fff;
    text-align: center;
    padding: 1.5rem 0;
}

h1 {
    font-size: 1.8rem;
    letter-spacing: 0.5px;
    font-weight: 600;
}

main.grid {
    display: grid;
    gap: 1.5rem;
    padding: 2rem 1rem;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem 1rem;
    text-align: center;
    text-decoration: none;
    color: var(--text);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    border: 1px solid #e0e0e0;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

.card .icon {
    font-size: 2.2rem;
    display: block;
    margin-bottom: 0.8rem;
}

.card strong {
    font-size: 1.1rem;
    font-weight: 500;
}

.card.help {
    border: 2px dashed var(--primary);
    background: #f0f8ff;
}

.info-box {
    background: #fff;
    color: #1b1e23;
    border: 2px solid #0d47a1;
    border-radius: 8px;
    padding: 1rem 1.2rem;
    margin: 1rem auto;
    max-width: 90%;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
    font-size: 0.95rem;
    line-height: 1.6;
}

.info-box strong {
    color: #0d47a1;
}

footer {
    margin-top: auto;
    text-align: center;
    font-size: 0.85rem;
    color: var(--muted);
    padding: 1rem 0;
}

@media (max-width: 800px) {
    h1 {
        font-size: 1.5rem;
    }

    main.grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }

    .card {
        padding: 1.2rem 0.9rem;
    }
}

@media (max-width: 500px) {
    main.grid {
        grid-template-columns: 1fr;
    }

    .card {
        padding: 1rem 0.8rem;
    }

    .card .icon {
        font-size: 1.6rem;
    }

    .card strong {
        font-size: 1rem;
    }

    .info-box {
        font-size: 0.85rem;
        padding: 0.8rem;
    }
}