* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    min-height: 100%;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    min-height: 100vh;
    color: #fff;
    background:
        linear-gradient(rgba(0, 0, 0, 0.58), rgba(0, 0, 0, 0.58)),
        url("background.jpg") center / cover fixed no-repeat;
}

main {
    width: min(1100px, calc(100% - 32px));
    margin: 0 auto;
    padding: 48px 0;
}

h1 {
    margin: 0 0 12px;
    text-align: center;
    font-size: clamp(2rem, 6vw, 4rem);
}

.intro {
    margin: 0 auto 32px;
    text-align: center;
    color: rgba(255,255,255,.86);
}

.version-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(92px, 1fr));
    gap: 10px;
}

.version-button,
.back-button {
    display: block;
    padding: 12px 10px;
    border: 1px solid rgba(255,255,255,.35);
    border-radius: 8px;
    color: #fff;
    background: rgba(0,0,0,.42);
    text-align: center;
    text-decoration: none;
    transition: background .15s ease, transform .15s ease;
}

.version-button:hover,
.back-button:hover {
    background: rgba(255,255,255,.18);
    transform: translateY(-1px);
}

.splash {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.splash-card {
    width: min(620px, 100%);
    padding: 38px;
    border: 1px solid rgba(255,255,255,.28);
    border-radius: 14px;
    background: rgba(0,0,0,.48);
    text-align: center;
    backdrop-filter: blur(3px);
}

.splash-card h1 {
    font-size: clamp(2rem, 7vw, 3.5rem);
}

.splash-card p {
    margin: 14px 0 26px;
    color: rgba(255,255,255,.82);
}

.back-button {
    width: fit-content;
    margin: 0 auto;
    padding-inline: 22px;
}