:root{--background:#1a1a1d;--card-bg:#2b2b2e;--text:#e0e0e0;--accent:#d62828;--accent-glow:#d6282866;--gold:#fcc200}body{color:var(--text);background:radial-gradient(circle,#2b2b2e 0%,#1a1a1d 100%);min-height:100vh;margin:0;padding:0;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif}.container{max-width:800px;margin:0 auto;padding:20px}.card{background:var(--card-bg);border:1px solid #333;border-radius:12px;margin-bottom:20px;padding:24px;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}h1,h2,h3,h4{margin-top:0}.btn{background:var(--accent);color:#fff;cursor:pointer;box-shadow:0 0 10px var(--accent-glow);border:none;border-radius:8px;padding:12px 24px;font-size:1rem;font-weight:700;transition:all .2s}.btn:hover{background:#a01010;transform:translateY(-2px)}.flip-card{perspective:1000px;background-color:#0000;width:100%;height:500px;margin-bottom:20px}.flip-card-inner{text-align:center;width:100%;height:100%;transform-style:preserve-3d;cursor:pointer;transition:transform .8s;position:relative}.flip-card.flipped .flip-card-inner{transform:rotateY(180deg)}.flip-card-front,.flip-card-back{backface-visibility:hidden;box-sizing:border-box;border-radius:12px;flex-direction:column;justify-content:center;align-items:center;width:100%;height:100%;padding:20px;display:flex;position:absolute;box-shadow:0 10px 30px #00000080}.flip-card-front{color:#fff;background-color:#333;border:1px solid #444}.flip-card-back{background-color:var(--card-bg);color:#fff;border:1px solid var(--accent);transform:rotateY(180deg)}.momo-font{letter-spacing:2px;text-transform:uppercase;color:var(--accent);font-family:Courier New,Courier,monospace}