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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    background: radial-gradient(ellipse at center, #14306b 0%, #0a1f44 60%, #050d22 100%);
    color: #fff;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "Helvetica Neue", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
    overscroll-behavior: none;
}

.stage {
    width: 100%;
    height: 100dvh;
    display: grid;
    place-items: center;
    perspective: 1400px;
    cursor: pointer;
}

.word {
    background: transparent;
    border: 0;
    color: inherit;
    font: inherit;
    font-weight: 800;
    font-size: clamp(4.5rem, 24vw, 16rem);
    letter-spacing: -0.03em;
    line-height: 1;
    padding: 0.4em 0.6em;
    cursor: pointer;
    transform-origin: center center;
    transform-style: preserve-3d;
    backface-visibility: hidden;
    text-shadow: 0 6px 30px rgba(0, 0, 0, 0.4);
    will-change: transform;
}

.word:focus { outline: none; }
.word:focus-visible { outline: 2px dashed rgba(255, 255, 255, 0.4); outline-offset: 8px; border-radius: 8px; }

.word.flipping {
    animation: flip 620ms cubic-bezier(0.6, 0, 0.4, 1);
}

@keyframes flip {
    0%      { transform: rotateX(0deg); }
    49.99%  { transform: rotateX(90deg); }
    50%     { transform: rotateX(-90deg); }
    100%    { transform: rotateX(0deg); }
}

@media (prefers-reduced-motion: reduce) {
    .word.flipping { animation: fade 300ms ease; }
    @keyframes fade {
        0% { opacity: 1; }
        50% { opacity: 0; }
        100% { opacity: 1; }
    }
}