:root{color-scheme:dark;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;--ink: #f8efe2;--muted: #cbbba5;--panel: rgba(37, 24, 17, .88);--panel-strong: #2b1b12;--line: rgba(245, 217, 178, .2);--gold: #d9a95b;--gold-bright: #ffd387;--green: #7fb069;--danger: #c85a45;--shadow: 0 24px 70px rgba(0, 0, 0, .45);background:#160f0b;color:var(--ink)}*{box-sizing:border-box}html,body,#root{width:100%;overflow-x:hidden}body{min-width:320px;min-height:100vh;margin:0;background:radial-gradient(circle at 20% 12%,rgba(217,169,91,.14),transparent 28rem),radial-gradient(circle at 80% 0%,rgba(127,176,105,.08),transparent 24rem),linear-gradient(135deg,#120b08,#26160d 48%,#100a08)}button{font:inherit}.app-shell{min-height:100vh;padding:clamp(18px,3vw,42px)}.game-stage{width:min(1180px,100%);margin:0 auto}.brand-row{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:18px}.eyebrow{margin:0 0 5px;color:var(--gold-bright);font-size:.78rem;font-weight:800;letter-spacing:0;text-transform:uppercase}h1{max-width:750px;margin:0;font-family:Georgia,Times New Roman,serif;font-size:clamp(2rem,5vw,4.6rem);font-weight:700;line-height:.95}.status-pill{min-width:158px;padding:12px 16px;border:1px solid rgba(255,211,135,.42);border-radius:999px;background:#23160fb8;box-shadow:inset 0 1px #ffffff17;color:var(--gold-bright);font-weight:800;text-align:center;white-space:nowrap}.status-pill.thinking{color:#d9f1c4}.game-layout{display:grid;grid-template-columns:minmax(0,730px) minmax(290px,360px);align-items:start;gap:clamp(18px,3vw,34px)}.board-wrap{display:flex;justify-content:center;width:100%;min-width:0}.board-frame{position:relative;width:min(100%,730px);max-width:calc(100vw - 28px);aspect-ratio:1;padding:clamp(12px,2.4vw,24px);border:1px solid rgba(255,229,185,.32);border-radius:8px;background:linear-gradient(135deg,rgba(255,231,190,.18),transparent 22%),linear-gradient(45deg,#5b321a,#8b552d 35%,#3a2115 70%,#9b6637);box-shadow:inset 0 0 0 8px #2b160b94,inset 0 0 34px #ffe0ad29,var(--shadow)}.board{position:relative;display:grid;grid-template-columns:repeat(8,minmax(0,1fr));grid-template-rows:repeat(8,minmax(0,1fr));grid-auto-columns:minmax(0,1fr);grid-auto-rows:minmax(0,1fr);width:100%;height:100%;aspect-ratio:1;overflow:hidden;border:1px solid rgba(54,30,16,.8);border-radius:4px;box-shadow:inset 0 0 34px #2b140785,0 12px 22px #00000057}.square{position:relative;display:grid;place-items:center;width:100%;height:100%;aspect-ratio:1;line-height:1;min-width:0;min-height:0;overflow:hidden;border:0;padding:0;cursor:pointer;isolation:isolate;transition:filter .14s ease,box-shadow .14s ease}.square:disabled{cursor:default}.square.light{background:linear-gradient(135deg,rgba(255,248,225,.24),transparent 45%),repeating-linear-gradient(90deg,rgba(128,76,35,.08) 0 7px,transparent 7px 13px),#c99458}.square.dark{background:linear-gradient(135deg,rgba(255,209,130,.1),transparent 45%),repeating-linear-gradient(90deg,rgba(35,17,7,.12) 0 8px,transparent 8px 15px),#76431f}.square:not(:disabled):hover{filter:brightness(1.08)}.square.selected{box-shadow:inset 0 0 0 4px #ffe18beb}.square.last-move:before,.square.check:before{position:absolute;inset:0;content:"";z-index:0}.square.last-move:before{background:#7fb06947}.square.check:before{background:radial-gradient(circle,#c85a45b8,#c85a451f 64%)}.piece{position:relative;z-index:2;font-family:Georgia,Times New Roman,serif;font-size:clamp(2rem,7.8vw,4.85rem);line-height:1;-webkit-user-select:none;user-select:none;transform:translateY(-1px)}.piece.w{color:#fff3da;text-shadow:0 2px 0 #9f7b49,0 6px 13px rgba(42,18,4,.5)}.piece.b{color:#1d1712;text-shadow:0 1px 0 rgba(255,230,184,.24),0 5px 11px rgba(0,0,0,.48)}.move-dot{position:absolute;z-index:1;width:30%;height:30%;border-radius:50%;background:#406b338c;box-shadow:0 0 0 6px #f3e0ae29}.square:has(.piece) .move-dot{width:72%;height:72%;border:5px solid rgba(117,36,25,.58);background:transparent}.coord{position:absolute;z-index:3;color:#2b150a8a;font-size:clamp(.56rem,1.7vw,.74rem);font-weight:900;pointer-events:none}.coord.file{right:7px;bottom:5px}.coord.rank{left:6px;top:5px}.side-panel{display:grid;gap:16px}.control-panel,.history-panel{border:1px solid var(--line);border-radius:8px;background:linear-gradient(180deg,#ffe7bb0f,#ffe7bb00),var(--panel);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.control-panel{display:grid;gap:18px;padding:18px}.button-row{display:grid;grid-template-columns:1fr;gap:10px}.primary-button,.icon-button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;gap:9px;border-radius:8px;border:1px solid rgba(255,221,156,.36);color:var(--ink);cursor:pointer;font-weight:800}.primary-button{background:linear-gradient(180deg,#d6a457,#91602d);color:#1d130d}.icon-button{background:#ffefd514}.icon-button:disabled{cursor:default;opacity:.48}.control-group{display:grid;gap:9px}.control-title,.panel-heading{color:var(--muted);font-size:.82rem;font-weight:800;text-transform:uppercase}.segmented{display:grid;grid-template-columns:repeat(2,1fr);overflow:hidden;border:1px solid rgba(255,229,185,.24);border-radius:8px;background:#00000029}.segmented.four{grid-template-columns:repeat(2,1fr)}.segmented button{min-height:42px;border:0;border-right:1px solid rgba(255,229,185,.15);background:transparent;color:var(--muted);cursor:pointer;font-weight:750}.segmented button:nth-child(2n),.segmented button:last-child{border-right:0}.segmented button.active{background:#d9a95b38;color:var(--gold-bright)}.compact-note{display:flex;align-items:flex-start;gap:8px;margin:0;color:var(--muted);font-size:.87rem;line-height:1.45}.compact-note>span{flex:0 0 auto;margin-top:2px;color:var(--gold)}.history-panel{min-height:250px;overflow:hidden}.panel-heading{display:flex;justify-content:space-between;padding:15px 16px;border-bottom:1px solid var(--line)}.panel-heading strong{color:var(--gold-bright)}.moves-list{max-height:min(43vh,430px);overflow:auto;padding:8px}.move-row{display:grid;grid-template-columns:42px 1fr 1fr;gap:8px;padding:8px;border-radius:6px;color:var(--ink);font-weight:750}.move-row:nth-child(odd){background:#ffffff0b}.move-number,.empty-history{color:var(--muted)}.empty-history{margin:10px;line-height:1.45}.modal-backdrop{position:fixed;inset:0;display:grid;place-items:center;padding:20px;background:#0a0604b8;z-index:10}.promotion-dialog{width:min(420px,100%);padding:20px;border:1px solid rgba(255,229,185,.34);border-radius:8px;background:var(--panel-strong);box-shadow:var(--shadow)}.promotion-dialog h2{margin:0 0 14px;font-family:Georgia,Times New Roman,serif}.promotion-options{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.promotion-options button{display:grid;gap:6px;place-items:center;min-height:104px;border:1px solid rgba(255,229,185,.24);border-radius:8px;background:#ffefd512;color:var(--ink);cursor:pointer;font-weight:800}.promotion-options .piece{font-size:2.7rem}@media(max-width:900px){.game-layout{grid-template-columns:1fr}.board-frame{margin:0 auto}.side-panel{grid-template-columns:1fr 1fr}}@media(max-width:680px){.app-shell{padding:10px}h1{font-size:clamp(1.65rem,9vw,2.35rem);line-height:1}.brand-row{gap:10px;margin-bottom:12px}.brand-row{align-items:stretch;flex-direction:column}.status-pill{width:100%}.side-panel{grid-template-columns:1fr}.board-frame{max-width:calc(100vw - 20px);padding:8px}.piece{font-size:clamp(1.65rem,9.2vw,3.6rem)}.coord{display:none}.promotion-options{grid-template-columns:repeat(2,1fr)}}@media(max-width:380px){.app-shell{padding:8px}.board-frame{max-width:calc(100vw - 16px);padding:6px}.status-pill{min-width:0;padding:10px 12px}}