html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background: var(--color-background);
    color: var(--color-text);
    overflow: hidden;
    position: relative;
}

.screen {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100dvh;
    width: 100%;
    padding: clamp(1rem, 4vw, 3rem);
    gap: clamp(1rem, 3vw, 2rem);
    position: relative;
}

.screen--active {
    display: flex;
}

.screen__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(1rem, 3vw, 2rem);
    width: 100%;
    max-width: 960px;
}

.screen__title {
    font-size: clamp(1.5rem, 5vw, 3rem);
    font-weight: 900;
    text-align: center;
    line-height: 1.2;
}

.screen__subtitle {
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    font-weight: 400;
    text-align: center;
    opacity: 0.8;
}

.button-group {
    display: flex;
    gap: clamp(0.75rem, 2vw, 1.5rem);
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
}

/* Responsive: stack buttons vertically on small screens */
@media (max-width: 480px) {
    .button-group--stack-mobile {
        flex-direction: column;
        align-items: stretch;
    }
}