:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{min-height:100vh;background:#1a1a2e;color:#e0e0e0}.chess-app{min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:1.5rem;gap:1rem}.title{font-size:1.75rem;font-weight:700;letter-spacing:-.02em;color:#f0f0f0}.game-container{display:flex;gap:1.5rem;align-items:flex-start}.sidebar{display:flex;flex-direction:column;gap:1rem;min-width:180px}.status-bar{background:#ffffff0f;border:1px solid rgba(255,255,255,.1);border-radius:.5rem;padding:.75rem 1rem}.turn-indicator{font-size:.95rem;font-weight:600}.turn-indicator.white{color:#f0f0f0}.turn-indicator.black{color:#aaa}.captured-area{display:flex;flex-direction:column;gap:.5rem}.captured-row{display:flex;flex-direction:column;gap:.25rem;background:#ffffff0a;border:1px solid rgba(255,255,255,.08);border-radius:.5rem;padding:.5rem .75rem}.captured-label{font-size:.75rem;color:#ffffff73;text-transform:uppercase;letter-spacing:.05em}.captured-pieces{display:flex;flex-wrap:wrap;gap:.15rem;font-size:1.4rem;min-height:1.8rem}.new-game-btn{padding:.6rem 1rem;border:1px solid rgba(255,255,255,.15);border-radius:.5rem;background:#ffffff0f;color:#e0e0e0;font-size:.9rem;font-weight:500;cursor:pointer;transition:background .15s}.new-game-btn:hover{background:#ffffff1f}.board-wrapper{display:flex}.board{display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);width:min(70vh,560px);height:min(70vh,560px);border:2px solid rgba(255,255,255,.15);border-radius:.35rem;overflow:hidden}.square{position:relative;display:flex;align-items:center;justify-content:center;cursor:pointer;-webkit-user-select:none;user-select:none;transition:background .1s}.square.light{background:#e8d5b5}.square.dark{background:#b58863}.square.selected{background:#f6f669!important}.square.valid-move:after{content:"";position:absolute;width:30%;height:30%;border-radius:50%;background:#0003;pointer-events:none}.square.valid-capture{box-shadow:inset 0 0 0 4px #00000040}.square.in-check{background:#f44!important;box-shadow:inset 0 0 12px #f009}.piece{font-size:min(7vh,56px);line-height:1;text-shadow:0 1px 3px rgba(0,0,0,.3);pointer-events:none;z-index:1}.piece.white{color:#fff;filter:drop-shadow(0 1px 1px rgba(0,0,0,.5))}.piece.black{color:#222;filter:drop-shadow(0 1px 1px rgba(0,0,0,.3))}.rank-label{position:absolute;top:2px;left:4px;font-size:.65rem;font-weight:700;pointer-events:none;z-index:0}.square.light .rank-label{color:#8b5a2bb3}.square.dark .rank-label{color:#e8d5b5b3}.file-label{position:absolute;bottom:2px;right:4px;font-size:.65rem;font-weight:700;pointer-events:none;z-index:0}.square.light .file-label{color:#8b5a2bb3}.square.dark .file-label{color:#e8d5b5b3}.promotion-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:100}.promotion-dialog{background:#2a2a3e;border:1px solid rgba(255,255,255,.15);border-radius:.75rem;padding:1.5rem 2rem;text-align:center}.promotion-dialog h3{margin-bottom:1rem;font-size:1.1rem;font-weight:600}.promotion-pieces{display:flex;gap:.75rem}.promotion-btn{width:64px;height:64px;font-size:2.5rem;display:flex;align-items:center;justify-content:center;border:1px solid rgba(255,255,255,.15);border-radius:.5rem;background:#ffffff0f;cursor:pointer;transition:background .15s}.promotion-btn:hover{background:#ffffff26}@media(max-width:700px){.game-container{flex-direction:column-reverse;align-items:center}.sidebar{flex-direction:row;flex-wrap:wrap;justify-content:center;min-width:unset}.board{width:min(90vw,480px);height:min(90vw,480px)}}