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

body {
    min-height: 100vh;

    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Helvetica,
        Arial,
        sans-serif;

    background:
        radial-gradient(
            circle at top left,
            #3b82f6 0%,
            transparent 40%
        ),
        radial-gradient(
            circle at bottom right,
            #8b5cf6 0%,
            transparent 40%
        ),
        #0f172a;

    color: #f8fafc;

    display: flex;
    align-items: center;
    justify-content: center;

    padding: 24px;
}

.container {
    width: 100%;
    max-width: 600px;
}

.card {
    background: rgba(255, 255, 255, 0.95);

    color: #0f172a;

    border-radius: 24px;

    padding: 50px 45px;

    text-align: center;

    box-shadow:
        0 25px 50px rgba(0, 0, 0, 0.25),
        0 0 0 1px rgba(255, 255, 255, 0.15);

    backdrop-filter: blur(10px);

    animation: appear 0.5s ease-out;
}

.icon {
    width: 80px;
    height: 80px;

    margin: 0 auto 25px;

    display: flex;
    align-items: center;
    justify-content: center;

    background: #eff6ff;

    border-radius: 20px;

    font-size: 40px;
}

.os-content {
    display: none;
}

.badge {
    display: inline-block;

    padding: 6px 14px;

    margin-bottom: 15px;

    border-radius: 999px;

    background: #e0e7ff;

    color: #4338ca;

    font-size: 13px;
    font-weight: 600;

    text-transform: uppercase;
    letter-spacing: 0.05em;
}

h1 {
    font-size: 36px;
    line-height: 1.2;

    margin-bottom: 18px;

    letter-spacing: -0.03em;
}

p {
    color: #64748b;

    font-size: 17px;
    line-height: 1.7;

    margin-bottom: 30px;
}

.button {
    display: inline-block;

    padding: 13px 26px;

    border-radius: 12px;

    background: #4f46e5;

    color: white;

    text-decoration: none;

    font-weight: 600;

    transition:
        transform 0.2s ease,
        box-shadow 0.2s ease,
        background 0.2s ease;
}

.button:hover {
    background: #4338ca;

    transform: translateY(-2px);

    box-shadow:
        0 8px 20px rgba(79, 70, 229, 0.35);
}

.button:active {
    transform: translateY(0);
}

@keyframes appear {
    from {
        opacity: 0;
        transform: translateY(15px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 600px) {

    body {
        padding: 15px;
    }

    .card {
        padding: 40px 25px;
        border-radius: 20px;
    }

    h1 {
        font-size: 29px;
    }

    p {
        font-size: 16px;
    }
}