:root {
    color-scheme: dark;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: radial-gradient(circle at 30% 20%, #18233f, #090d18 60%, #04060b 100%);
    color: #f0f4ff;
}

.background-gradient {
    position: absolute;
    inset: -40vmax;
    background:
        radial-gradient(circle at 20% 30%, rgba(132, 178, 255, 0.16), transparent 55%),
        radial-gradient(circle at 80% 35%, rgba(191, 128, 255, 0.14), transparent 60%),
        radial-gradient(circle at 40% 75%, rgba(102, 228, 255, 0.12), transparent 65%);
    filter: blur(140px);
    z-index: 0;
}

.content {
    position: relative;
    z-index: 1;
    padding: clamp(2rem, 5vw, 3.5rem) clamp(2.25rem, 6vw, 4.5rem);
    text-align: center;
    backdrop-filter: blur(12px) saturate(130%);
    background: linear-gradient(135deg, rgba(11, 18, 36, 0.78), rgba(32, 25, 58, 0.58));
    border-radius: 2.75rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow:
        0 45px 70px rgba(12, 18, 36, 0.55),
        inset 0 0 0 1px rgba(255, 255, 255, 0.05),
        inset 0 0 40px rgba(120, 160, 255, 0.12);
}

.content::before {
    content: '';
    position: absolute;
    inset: 1.5rem;
    border-radius: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.05);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0));
    opacity: 0.8;
    z-index: -1;
}

.content h1 {
    margin: 0;
    font-size: clamp(2.5rem, 4.5vw, 4.5rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    line-height: 1.1;
    text-shadow:
        0 10px 25px rgba(32, 54, 124, 0.35),
        0 0 12px rgba(132, 178, 255, 0.35);
}

@media (max-width: 900px) {
    body {
        align-items: stretch;
        padding: 3rem 1.5rem;
    }

    .content {
        margin: auto;
        border-radius: 2rem;
        padding: 2rem;
    }

    .content::before {
        inset: 1rem;
    }
}

@media (max-width: 640px) {
    body {
        padding: 2.5rem 1.25rem;
    }
}