:root{--bg:#000;--surface:#0d0e0f;--surface-2:#141617;--text:#fff;--muted:#8f9498;--dim:#5f666a;--border:#25292b;--blue:#159fe3;--blue-dim:rgba(21,159,227,.14);--light:#d9d8d1;--dark:#597486;--last:rgba(21,159,227,.4);--selected:rgba(251,194,61,.7);--check:rgba(234,83,83,.72)}
*{box-sizing:border-box;margin:0;padding:0}body{min-width:320px;background:radial-gradient(circle at 50% 30%,rgba(21,159,227,.055),transparent 35%),var(--bg);color:var(--text);font-family:Inter,Arial,sans-serif}.container{max-width:1360px;margin:auto;padding:0 28px}.nav{height:72px;border-bottom:1px solid #171819;background:rgba(0,0,0,.78);backdrop-filter:blur(18px)}.nav-inner{height:100%;max-width:1360px;margin:auto;padding:0 28px;display:flex;justify-content:space-between;align-items:center}.brand{position:relative;color:#fff;font-weight:800;font-size:20px;letter-spacing:.08em;text-decoration:none}.brand span{color:var(--blue)}.brand small{position:absolute;top:23px;left:1px;font-size:7px;color:var(--dim);letter-spacing:.23em}.account-avatar,.player-avatar,.ai-avatar{display:grid;place-items:center;border-radius:50%;font-weight:700}.account-avatar{width:31px;height:31px;background:linear-gradient(135deg,var(--blue),#5b7cff);font-size:11px}.game-page{padding-bottom:64px}.game-header{display:flex;align-items:end;justify-content:space-between;padding:44px 0 30px}.eyebrow{font-size:10px;font-weight:700;letter-spacing:.15em;color:var(--dim)}h1{font-size:44px;letter-spacing:-.06em;line-height:1.1;margin-top:8px}h2{font-size:18px;letter-spacing:-.035em}.button{min-height:42px;padding:0 17px;border:1px solid var(--border);border-radius:9px;background:var(--surface-2);color:#fff;font-size:12px;font-weight:600;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:10px;cursor:pointer}.button-primary{background:var(--blue);border-color:var(--blue);color:#00131e}.button:hover,.control-button:hover,.choice:hover{filter:brightness(1.12)}.wide{width:100%}.game-layout{display:grid;grid-template-columns:220px minmax(440px,640px) 220px;justify-content:center;gap:34px;align-items:start}.left-column,.right-column{display:grid;gap:14px}.player-card,.moves-card,.info-card,.controls-card{border:1px solid var(--border);border-radius:13px;background:linear-gradient(145deg,rgba(20,22,23,.9),rgba(8,9,10,.96))}.player-card{display:flex;gap:12px;align-items:center;padding:18px}.player-avatar{width:38px;height:38px;background:linear-gradient(135deg,var(--blue),#376c92);font-size:13px}.player-card h2{margin-top:4px;font-size:14px}.player-card p:last-child{font-size:11px;color:var(--muted);margin-top:3px}.moves-card{min-height:260px;overflow:hidden}.moves-card header{display:flex;justify-content:space-between;padding:15px 16px;border-bottom:1px solid var(--border);color:var(--muted);font-size:11px;font-weight:600}.moves-list{max-height:340px;overflow:auto;padding:8px 10px}.empty-state{text-align:center;color:var(--dim);font-size:11px;padding:45px 5px}.move-row{display:grid;grid-template-columns:30px 1fr 1fr;min-height:31px;align-items:center;font-size:12px;border-radius:6px}.move-row:nth-child(odd){background:rgba(255,255,255,.025)}.move-number{color:var(--dim);padding-left:7px}.move-san{color:var(--muted);padding:0 5px}.move-san.last{color:#fff;font-weight:700}.board-column{min-width:0}.board-status{height:27px;text-align:center;color:var(--blue);font-weight:600;font-size:12px}.board-wrap{position:relative;aspect-ratio:1;padding:8px;border:1px solid #26363e;border-radius:14px;background:#0b1013;box-shadow:0 26px 80px rgba(0,0,0,.52)}.board{width:100%;height:100%;display:grid;grid-template:repeat(8,1fr)/repeat(8,1fr);overflow:hidden;border-radius:8px;touch-action:none}.square{position:relative;border:0;display:grid;place-items:center;padding:0;aspect-ratio:1;cursor:pointer}.square.light{background:var(--light)}.square.dark{background:var(--dark)}.square.last-move::after,.square.selected::after,.square.in-check::after{content:"";position:absolute;inset:0;pointer-events:none}.square.last-move::after{background:var(--last)}.square.selected::after{background:var(--selected)}.square.in-check::after{background:var(--check)}.square.legal::before{content:"";position:absolute;z-index:2;width:18%;aspect-ratio:1;border-radius:50%;background:rgba(0,17,25,.34)}.square.legal.capture::before{width:76%;background:none;border:4px solid rgba(0,17,25,.3)}.piece{position:relative;z-index:3;width:79%;height:79%;filter:drop-shadow(0 2px 1px rgba(0,0,0,.3));pointer-events:none}.piece.white{color:#faf9f2}.piece.black{color:#20282d}.piece svg{width:100%;height:100%;overflow:visible}.piece path{stroke:currentColor;stroke-width:1.2;stroke-linejoin:round}.coordinates{position:absolute;z-index:4;pointer-events:none;font-size:9px;font-weight:700;color:rgba(16,31,36,.65)}.files{display:grid;grid-template-columns:repeat(8,1fr);left:14px;right:14px;bottom:10px}.files span{text-align:right;padding-right:2px}.ranks{display:grid;grid-template-rows:repeat(8,1fr);top:12px;bottom:12px;left:10px}.flip-button{margin:12px auto 0;display:block;background:none;border:0;color:var(--muted);font-size:11px;cursor:pointer}.flip-button:hover{color:#fff}.info-card{padding:17px}.opponent{display:flex;align-items:center;gap:10px;margin:15px 0 17px;font-size:13px}.ai-avatar{width:30px;height:30px;background:radial-gradient(circle at 30% 25%,#72d6fd,var(--blue) 55%,#086086);font-size:13px}.info-card dl{display:grid;gap:0}.info-card dl div{display:flex;justify-content:space-between;gap:8px;padding:10px 0;border-top:1px solid var(--border);font-size:11px}.info-card dt{color:var(--dim)}.info-card dd{color:var(--muted);font-weight:600;text-align:right}.controls-card{padding:7px;display:grid;gap:3px}.control-button{padding:11px 10px;border:0;border-radius:7px;background:none;color:var(--muted);text-align:left;font-size:12px;cursor:pointer}.control-button.danger:hover{background:rgba(234,83,83,.1);color:#ee9191}.modal-backdrop{position:fixed;inset:0;z-index:20;display:grid;place-items:center;padding:18px;background:rgba(0,0,0,.72);backdrop-filter:blur(8px)}.modal{position:relative;width:min(440px,100%);padding:30px;border:1px solid var(--border);border-radius:16px;background:#0d0f10;box-shadow:0 30px 100px rgba(0,0,0,.6)}.modal h2{font-size:27px;margin:8px 0 25px}.modal-close{position:absolute;top:13px;right:16px;background:none;border:0;color:var(--muted);font-size:25px;cursor:pointer}.modal fieldset{border:0;margin:0 0 22px}.modal legend{font-size:11px;color:var(--muted);margin-bottom:10px}.choice-list{display:grid;gap:7px}.choice{padding:12px;border:1px solid var(--border);border-radius:8px;background:#121415;color:var(--muted);font-size:12px;text-align:left;cursor:pointer}.choice.active{border-color:var(--blue);background:var(--blue-dim);color:#e6f8ff}.promotion-options{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.promotion-options button{border:1px solid var(--border);border-radius:9px;background:#141617;padding:9px;cursor:pointer}.promotion-options .piece{display:block;width:47px;height:47px;margin:auto}.result-modal p:not(.eyebrow){color:var(--muted);font-size:13px;margin:-12px 0 23px}.toast{position:fixed;z-index:30;left:50%;bottom:22px;transform:translate(-50%,20px);opacity:0;pointer-events:none;max-width:min(500px,calc(100% - 28px));padding:11px 14px;border:1px solid var(--border);border-radius:9px;background:#181a1b;color:#fff;font-size:12px;transition:.2s}.toast.visible{opacity:1;transform:translate(-50%,0)}.toast.error{border-color:#a74d4d}.toast.success{border-color:#287d9e}.auth-gate{min-height:calc(100vh - 72px);display:grid;place-items:center}.auth-card{width:min(410px,100%);padding:32px;border:1px solid var(--border);border-radius:16px;background:#101213}.auth-card h1{font-size:32px}.auth-card p{color:var(--muted);font-size:13px;line-height:1.55;margin:15px 0 23px}[hidden]{display:none!important}
@media(max-width:980px){.game-layout{grid-template-columns:minmax(0,640px);gap:14px}.left-column,.right-column{display:contents}.player-card{order:-2}.info-card{order:-1;display:grid;grid-template-columns:auto 1fr;column-gap:18px;align-items:center}.info-card>.eyebrow{grid-row:1/3}.opponent{margin:0}.info-card dl{grid-column:1/-1;grid-template-columns:repeat(3,1fr);margin-top:14px}.info-card dl div{display:block}.info-card dd{margin-top:3px;text-align:left}.controls-card{order:2;grid-template-columns:repeat(4,1fr)}.control-button{text-align:center}.moves-card{order:1}.board-column{order:0}}
@media(max-width:580px){.container,.nav-inner{padding-left:14px;padding-right:14px}.game-header{padding:28px 0 22px;align-items:center}.game-header h1{font-size:36px}.game-header .button{min-height:38px;padding:0 12px}.board-wrap{padding:5px;border-radius:10px}.files{left:9px;right:9px;bottom:7px}.ranks{left:6px;top:8px;bottom:8px}.info-card{display:block}.info-card>.eyebrow{display:block;margin-bottom:12px}.opponent{margin-bottom:13px}.info-card dl{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.info-card dl div{border-top:1px solid var(--border);padding-top:8px}.controls-card{grid-template-columns:repeat(2,1fr)}.moves-card{min-height:180px}.modal{padding:24px 19px}.modal h2{font-size:24px}.auth-card{padding:26px}}
.auth-form{display:grid;gap:13px;margin:20px 0 14px}.auth-form label{display:grid;gap:7px;color:var(--muted);font-size:11px}.auth-form input{width:100%;padding:12px;border:1px solid var(--border);border-radius:8px;background:#060707;color:#fff;outline:0}.auth-form input:focus{border-color:var(--blue)}.auth-form button:disabled{opacity:.65;cursor:wait}.auth-secondary{display:block;color:var(--blue);font-size:11px;text-align:center;text-decoration:none}.auth-secondary:hover{text-decoration:underline}