*{box-sizing:border-box}body{color:#f0f0f0;background:#0a0d14;margin:0;font-family:Inter,Roboto,-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif}button{font:inherit}.app-shell{color:#eee;background:linear-gradient(130deg,#111 0%,#1f2330 45%,#1a2639 100%);flex-direction:column;align-items:center;min-height:100vh;padding:1rem 0;display:flex}.app-header{text-align:center;margin-bottom:1rem}.app-header h1{margin:0;font-size:2rem}.app-header p{color:#ced6e0;margin:.2rem 0 0}.board-area{width:100%;max-width:620px}.chess-container{gap:.7rem;max-width:520px;margin:0 auto;padding:1rem;display:grid}.toolbar{justify-content:space-between;display:flex}.toolbar button{color:#fff;cursor:pointer;background:#121212;border:1px solid #2d2d2d;border-radius:6px;padding:.45rem .8rem}.board-grid{border:2px solid #444;grid-template-columns:repeat(8,1fr);gap:1px;display:grid}.square{cursor:pointer;border:none;justify-content:center;align-items:center;width:60px;height:60px;margin:0;padding:0;display:flex;position:relative}.square.light{background:#f0d9b5}.square.dark{background:#b58863}.square.selected{box-shadow:inset 0 0 0 3px #00d1fe}.square img{object-fit:contain;pointer-events:none;width:90%;height:90%}.status{color:#fff;background:#2f3336d9;border-radius:8px;padding:.7rem;font-size:.88rem;line-height:1.3}.status code{white-space:pre-wrap;word-break:break-word;margin-top:.2rem;display:block}