:root{
    --bg:#0f1720;
    --card:#0b1220;
    --accent:#00d084;
    --text:#e6eef7;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial;color:var(--text);background:linear-gradient(180deg,#07101a,#0b1a2a)}
.center{
    height:100%;
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap:16px;
    text-align:center;
    padding:24px;
}
h1{margin:0;font-size:2.2rem;letter-spacing:0.02em}
.subtitle{margin:0;opacity:0.85}
.play-btn{
    display:inline-block;
    padding:14px 30px;
    background:var(--accent);
    color:#042023;
    font-weight:700;
    border-radius:10px;
    text-decoration:none;
    box-shadow:0 6px 18px rgba(0,0,0,0.35);
    transition:transform .08s ease, box-shadow .08s ease;
}
.play-btn:active{transform:translateY(2px); box-shadow:0 4px 12px rgba(0,0,0,0.4)}
.small{margin-top:8px;opacity:0.7;font-size:0.85rem}