/* Reset some default styles */
html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: "Inter", "Segoe UI", Arial, sans-serif;
    background: linear-gradient(135deg, #e0e7ef 0%, #cfd9df 50%, #f6f7fb 100%);
    color: #f3f4f6;
}

/* Center the card both vertically and horizontally */
centered {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* Card styling */
card {
    background: radial-gradient(
        ellipse at 60% 40%,
        #23272f 0%,
        #181a20 70%,
        #111217 100%
    );
    border-radius: 18px;
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.28),
        0 1.5px 6px rgba(0, 0, 0, 0.12);
    padding: 2.5rem 2rem;
    min-width: 320px;
    max-width: 360px;
    display: flex;
    flex-direction: column;
    align-items: center;
    color: #f3f4f6;
}

card h1 {
    font-size: 2.1rem;
    font-weight: 700;
    margin-bottom: 2rem;
    letter-spacing: -0.5px;
    color: #f3f4f6;
    text-align: center;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.12);
}

/* Button styling */
button {
    background: #16181d;
    color: #f3f4f6;
    border: none;
    border-radius: 8px;
    padding: 0.9rem 1.6rem;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    transition: background 0.18s;
    box-shadow: 0 2px 8px rgba(46, 164, 79, 0.18);
}
button#github {
    background: #2ea44f;
}

button:hover#github {
    background: #228c3a;
}
button:hover {
    background: #24292f;
}

/* SVG icon styling */
button svg {
    width: 1.5em;
    height: 1.5em;
    fill: #f3f4f6;
    vertical-align: middle;
}