body {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

header {
    margin: 4rem 0 2rem;
    text-align: center;
}

.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    width: 90%;
    max-width: 1000px;
    padding: 1rem;
    align-items: start;
}

.card-group {
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

.card-group:hover {
    transform: translateY(-8px);
}

.card-main {
    background-color: var(--c-bg-card);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    padding: 2rem;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 2;
    transition: box-shadow 0.3s ease, background-color 0.3s ease;
}

.card-main h2 {
    margin-top: 0;
    color: var(--c-accent);
    border-bottom: 2px solid var(--c-border);
    padding-bottom: 0.5rem;
}

.card-main p {
    line-height: 1.6;
    color: var(--c-text-sub);
    margin-bottom: 0;
}

.card-group:hover .card-main {
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.card-github {
    background-color: var(--c-bg-main);
    color: var(--c-text-sub);
    text-decoration: none;
    padding: 0.6rem 1.5rem;
    margin: 0 1.5rem;
    border-radius: 0 0 8px 8px;
    font-size: 0.85rem;
    font-family: monospace;
    text-align: center;
    border: 1px solid var(--c-border);
    border-top: none;
    transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.3s ease;
}

.card-github:hover {
    background-color: var(--c-border);
    color: var(--c-text-main);
}

.card-group:hover .card-github {
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

footer {
    margin-top: auto;
    padding: 2rem 0;
    text-align: center;
    width: 100%;
}

footer p {
    color: var(--c-text-sub);
    font-size: 0.85rem;
    margin: 0;
    letter-spacing: 0.05em;
}