:root{--bg-dark:#121212;--bg-card:#1e1e1e;--text-main:#f0f0f0;--text-muted:#888;--accent:#ff6b6b;--accent-hover:#ff8787;--board-bg:transparent;--stone-black:#222;--stone-white:#f5f5f5;--line-color:#141414}body{background-color:var(--bg-dark);color:var(--text-main);flex-direction:column;min-height:100vh;margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;display:flex}#root{flex-direction:column;min-height:100vh;display:flex}.container{box-sizing:border-box;width:100%;max-width:800px;margin:0 auto;padding:2rem}h1,h2,h3{margin-bottom:1rem;font-weight:600}.card{background:var(--bg-card);border-radius:12px;padding:2rem;box-shadow:0 8px 24px #0003}.btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;padding:.8rem 1.5rem;font-size:1rem;font-weight:600;transition:all 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