/* Chess Classic – Richard Sim © */
:root{
  --bg:#15110e; --bg2:#1d1814; --panel:#211a15; --panel2:#2a211a; --line:rgba(201,166,94,.22); --line2:rgba(201,166,94,.45);
  --gold:#c9a65e; --gold2:#e6cc8f; --gold3:#9c7c3c; --cream:#f1e8d6; --text:#ece3cf; --muted:#a99a80; --red:#c0543f;
  --sq-light:#ece0c2; --sq-dark:#45664c; --frame:#3a2617;
  --serif:'CK Display',Georgia,'Times New Roman',serif; --sans:'CK Sans','Segoe UI',system-ui,-apple-system,Arial,sans-serif;
  --ease:cubic-bezier(.22,.8,.26,1);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--text);font:15px/1.5 var(--sans);-webkit-font-smoothing:antialiased;
  background-image:radial-gradient(1200px 700px at 50% -10%,rgba(201,166,94,.10),transparent 60%),radial-gradient(900px 600px at 50% 120%,rgba(0,0,0,.55),transparent 70%);
  background-attachment:fixed}
#app{min-height:100%;display:flex;flex-direction:column}
button,input{font:inherit;color:inherit}
button{cursor:pointer}
.hidden{display:none!important}
.muted{color:var(--muted)}
.small{font-size:13px}
:focus-visible{outline:2px solid var(--gold2);outline-offset:2px}

/* top bar */
.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px clamp(14px,3vw,32px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;background:none;border:0;padding:4px;font:600 20px var(--serif);letter-spacing:.02em;color:var(--cream)}
.brand em{color:var(--gold);font-style:italic;font-weight:500}
.brand-mark{width:22px;height:22px;border-radius:3px;background:conic-gradient(var(--gold) 0 25%,#2b1f17 0 50%,var(--gold) 0 75%,#2b1f17 0);box-shadow:0 0 0 1px var(--gold3)}
.icon-btn{width:40px;height:40px;border-radius:50%;border:1px solid var(--line2);background:var(--panel);display:grid;place-items:center;transition:.2s}
.icon-btn:hover{border-color:var(--gold);background:var(--panel2)}
.icon-btn::before{content:"";width:20px;height:20px;background:var(--gold2);-webkit-mask:var(--ico) center/contain no-repeat;mask:var(--ico) center/contain no-repeat}
#soundBtn{--ico:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 9h4l5-4v14l-5-4H4z' fill='black'/%3E%3Cpath d='M16.5 8.5a5 5 0 0 1 0 7M19 6a8.5 8.5 0 0 1 0 12'/%3E%3C/svg%3E")}
#soundBtn.off{--ico:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='1.8' stroke-linecap='round'%3E%3Cpath d='M4 9h4l5-4v14l-5-4H4z' fill='black'/%3E%3Cpath d='M17 9l5 6M22 9l-5 6'/%3E%3C/svg%3E")}

.screen{display:none;flex:1;padding:clamp(12px,3vw,36px)}
.screen.active{display:block}
#game.active{padding-top:clamp(10px,1.6vh,22px);padding-bottom:10px}

/* cards & controls */
.card{background:linear-gradient(180deg,var(--panel2),var(--panel));border:1px solid var(--line);border-radius:14px;box-shadow:0 18px 40px rgba(0,0,0,.35),inset 0 1px 0 rgba(255,255,255,.04)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:10px;padding:11px 18px;border:1px solid var(--line2);background:transparent;font-weight:700;letter-spacing:.03em;transition:background .2s,border-color .2s,transform .1s,box-shadow .2s}
.btn:active{transform:translateY(1px)}
.btn.gold{background:linear-gradient(180deg,#d9bb74,#b8954d);color:#1d150d;border-color:#e8cf91;box-shadow:0 6px 18px rgba(201,166,94,.25),inset 0 1px 0 rgba(255,255,255,.45)}
.btn.gold:hover{background:linear-gradient(180deg,#e6c983,#c3a056)}
.btn.ghost{background:rgba(255,255,255,.02);color:var(--text)}
.btn.ghost:hover{border-color:var(--gold);background:rgba(201,166,94,.08)}
.btn[disabled]{opacity:.38;cursor:default;pointer-events:none}
.btn.wide{width:100%;margin-top:auto}
input[type=text],input:not([type]){width:100%;background:#17120e;border:1px solid var(--line2);border-radius:9px;padding:10px 12px;outline:none;transition:border-color .2s}
input:not([type]):focus{border-color:var(--gold)}
.code-input{text-transform:uppercase;letter-spacing:.4em;font:600 22px var(--serif);text-align:center}
#onLicense{text-transform:uppercase;letter-spacing:.06em}
.label{display:block;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:12px 0 6px}
.check{display:flex;align-items:center;gap:8px;color:var(--muted);margin:14px 0 4px;cursor:pointer}
.check input{accent-color:var(--gold);width:16px;height:16px}
.hint{font-size:13px;color:var(--muted);margin:6px 0 0;font-style:italic}

/* home */
.hero{text-align:center;margin:clamp(4px,2vh,24px) auto clamp(18px,4vh,40px)}
.hero h1{font:500 clamp(52px,9vw,104px)/1 var(--serif);margin:0;letter-spacing:.01em;color:var(--cream);text-shadow:0 2px 30px rgba(201,166,94,.18)}
.hero-sub{font:italic 400 clamp(16px,2vw,21px) var(--serif);color:var(--gold);margin:12px 0 0}
.hero-ornament{width:220px;height:14px;margin:0 auto 18px;background:linear-gradient(90deg,transparent,var(--gold) 30%,var(--gold) 70%,transparent) center/100% 1px no-repeat;position:relative}
.hero-ornament::after{content:"";position:absolute;left:50%;top:50%;width:9px;height:9px;transform:translate(-50%,-50%) rotate(45deg);background:var(--bg);border:1px solid var(--gold)}
.modes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;max-width:1100px;margin:0 auto}
.mode{padding:24px 24px 22px;display:flex;flex-direction:column}
.mode h2{font:500 26px var(--serif);margin:0 0 4px;color:var(--cream)}
.mode>p.muted{margin:0 0 12px}
.levels{display:grid;gap:8px;margin:6px 0 4px}
.level{display:grid;grid-template-columns:1fr auto;align-items:center;gap:2px 10px;text-align:left;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:rgba(0,0,0,.18);transition:.2s}
.level b{font:600 16px var(--serif);color:var(--cream)}
.level small{grid-column:1/-1;color:var(--muted);font-size:12.5px;line-height:1.35}
.level .pips{display:flex;gap:4px}.level .pips i{width:7px;height:7px;border-radius:50%;border:1px solid var(--gold3)}
.level .pips i.f{background:var(--gold);border-color:var(--gold)}
.level:hover{border-color:var(--line2)}
.level[aria-checked=true]{border-color:var(--gold);background:linear-gradient(180deg,rgba(201,166,94,.14),rgba(201,166,94,.04));box-shadow:inset 0 0 0 1px rgba(201,166,94,.3)}
.seg{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.seg button{display:flex;align-items:center;justify-content:center;gap:8px;padding:9px 6px;border-radius:9px;border:1px solid var(--line);background:rgba(0,0,0,.18);font-weight:700;font-size:14px}
.seg button[aria-checked=true]{border-color:var(--gold);background:rgba(201,166,94,.12);color:var(--cream)}
.disc{display:inline-block;width:16px;height:16px;border-radius:50%;flex:none}
.disc.black{background:radial-gradient(circle at 35% 30%,#555,#121212 65%);box-shadow:0 0 0 1px var(--gold3)}
.disc.white{background:radial-gradient(circle at 35% 30%,#fffdf6,#d6c8a8 70%);box-shadow:0 0 0 1px var(--gold3)}
.disc.mixed{background:linear-gradient(90deg,#1a1a1a 50%,#efe4cc 50%);box-shadow:0 0 0 1px var(--gold3)}
.tabs{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line);margin-bottom:4px}
.tabs button{background:none;border:0;padding:10px 4px;color:var(--muted);font-weight:700;border-bottom:2px solid transparent;margin-bottom:-1px}
.tabs button[aria-selected=true]{color:var(--cream);border-bottom-color:var(--gold)}
.pane{display:flex;flex-direction:column;flex:1}
.pane .btn.wide{margin-top:16px}
.online-msg{min-height:1.3em;margin:10px 0 0;font-size:14px;color:var(--gold2)}
.online-msg.err{color:#e59a83}

/* lobby */
#lobby.active{display:grid;place-items:center}
.lobby-card{width:min(560px,100%);padding:34px clamp(20px,4vw,40px);text-align:center}
.eyebrow{font-size:12px;letter-spacing:.24em;text-transform:uppercase;color:var(--gold);margin:0 0 6px}
.lobby-card h2{font:500 30px var(--serif);margin:0;color:var(--cream)}
.room-code{font:600 clamp(54px,12vw,84px)/1.1 var(--serif);letter-spacing:.18em;color:var(--gold2);margin:12px 0 8px;padding-left:.18em;text-shadow:0 0 30px rgba(201,166,94,.25)}
.lobby-link{display:flex;gap:8px;margin:18px 0}
.lobby-link input{font-size:13px;color:var(--muted)}
.lobby-seats{display:grid;gap:10px;margin:8px 0 14px;text-align:left}
.seat{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:rgba(0,0,0,.2)}
.seat .disc{width:26px;height:26px}
.seat div{flex:1;display:flex;flex-direction:column}
.seat b{font:600 17px var(--serif);color:var(--cream)}
.seat.waiting{border-style:dashed}
.dot{width:10px;height:10px;border-radius:50%;background:#5b5045}.dot.on{background:#6fbf73;box-shadow:0 0 10px #6fbf73}
.pulse{animation:pulse 1.8s ease-in-out infinite}@keyframes pulse{50%{opacity:.4}}

/* game */
.game-wrap{display:grid;grid-template-columns:auto minmax(280px,340px);gap:clamp(16px,2.5vw,32px);justify-content:center;align-items:start;max-width:1280px;margin:0 auto}
.game-wrap{--bs:max(300px,min(calc(100vh - 262px),calc(100vw - 460px),760px))}
.board-col{display:flex;flex-direction:column;gap:10px}
.board-frame{width:calc(var(--bs) + 2*var(--fw));padding:var(--fw);--fw:clamp(10px,1.9vw,22px);border-radius:10px;position:relative;
  background:linear-gradient(135deg,#4a2f1b,#2b1a0f 45%,#4a2f1b),var(--frame);
  box-shadow:0 30px 60px rgba(0,0,0,.55),0 0 0 1px #1a0f08,inset 0 1px 0 rgba(255,255,255,.12),inset 0 0 0 1px rgba(201,166,94,.25)}
.board-frame::before{content:"";position:absolute;inset:calc(var(--fw) - 5px);border:1px solid rgba(201,166,94,.55);border-radius:3px;pointer-events:none}
.board{position:relative;width:var(--bs);height:var(--bs);border-radius:2px;overflow:hidden;outline:none;touch-action:none;user-select:none;-webkit-user-select:none;box-shadow:0 0 0 1px rgba(0,0,0,.6)}
.board:focus-visible{box-shadow:0 0 0 2px var(--gold2)}
.squares{position:absolute;inset:0;display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr)}
.sq{position:relative}
.sq.l{background:var(--sq-light)}
.sq.d{background:var(--sq-dark)}
.squares::after{content:"";position:absolute;inset:0;pointer-events:none;opacity:.22;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='320' height='320'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.012 0.38' numOctaves='3' seed='7'/%3E%3CfeColorMatrix values='0 0 0 0 0.35 0 0 0 0 0.22 0 0 0 0 0.1 0 0 0 1.1 -0.2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");background-size:320px 320px}
.squares::before{content:"";position:absolute;inset:0;pointer-events:none;z-index:1;background:radial-gradient(ellipse at 30% 20%,rgba(255,240,210,.12),transparent 60%),radial-gradient(ellipse at 50% 120%,rgba(0,0,0,.25),transparent 60%)}

.sq .co{position:absolute;font:700 clamp(8px,1.05vw,12px)/1 var(--sans);pointer-events:none;opacity:.85}
.sq .co.f{right:5%;bottom:4%}.sq .co.r{left:5%;top:4%}
.sq.l .co{color:var(--sq-dark)}.sq.d .co{color:var(--sq-light)}
.board.nocoord .sq .co{display:none}
.board.walnut{--sq-light:#e3c99c;--sq-dark:#8a5a35}
.sq.last{box-shadow:inset 0 0 0 100px rgba(214,178,92,.38)}
.sq.last-from{box-shadow:inset 0 0 0 100px rgba(214,178,92,.24)}
.sq.sel{box-shadow:inset 0 0 0 100px rgba(230,196,110,.5),inset 0 0 0 2px var(--gold2)}
.sq.target::after{content:"";position:absolute;left:50%;top:50%;width:30%;height:30%;transform:translate(-50%,-50%);border-radius:50%;background:rgba(30,24,16,.28);z-index:6;pointer-events:none}
.sq.target.cap::after{width:88%;height:88%;background:transparent;box-shadow:inset 0 0 0 clamp(3px,.5vw,6px) rgba(30,24,16,.3)}
.sq.check{background-image:radial-gradient(circle,rgba(214,70,50,.85) 0,rgba(214,70,50,.45) 40%,transparent 72%)}
.sq.loose::before{content:"";position:absolute;inset:6%;border-radius:50%;border:3px solid rgba(206,72,52,.9);box-shadow:0 0 14px rgba(206,72,52,.6);animation:breathe2 1.4s ease-in-out infinite;z-index:6;pointer-events:none}
.sq.hint-from{box-shadow:inset 0 0 0 100px rgba(95,170,110,.35)}
.sq.hint-to{box-shadow:inset 0 0 0 100px rgba(95,170,110,.5)}
@keyframes breathe2{50%{opacity:.45}}
.arrows{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:7}
.arrows .a-good{stroke:rgba(84,168,98,.85);fill:rgba(84,168,98,.85)}
.arrows .a-bad{stroke:rgba(214,78,58,.85);fill:rgba(214,78,58,.85)}
.arrows line{stroke-width:.16;stroke-linecap:round}
.arrows polygon{stroke:none}
.pieces{position:absolute;inset:0;z-index:5;pointer-events:none}
.pc{position:absolute;left:0;top:0;width:12.5%;height:12.5%;transition:transform .24s var(--ease),opacity .3s;will-change:transform;display:grid;place-items:center}
.pc svg{width:92%;height:92%;transition:transform .15s}
.pc.drag{transition:none;z-index:9}
.pc.lift svg{transform:scale(1.08) translateY(-3%)}
.pc.gone{opacity:0}
.cursor{position:absolute;width:12.5%;height:12.5%;left:0;top:0;border:2px dashed var(--gold2);z-index:8;pointer-events:none;transition:transform .12s}
.promo{position:absolute;inset:0;z-index:12;background:rgba(10,8,6,.55);display:grid;place-items:center}
.promo .box{display:flex;gap:6px;padding:10px;border-radius:12px;background:linear-gradient(180deg,var(--panel2),var(--panel));border:1px solid var(--gold)}
.promo button{width:calc(var(--bs)/8.5);height:calc(var(--bs)/8.5);border-radius:9px;border:1px solid var(--line2);background:var(--sq-light);display:grid;place-items:center;padding:0}
.promo button:hover,.promo button:focus-visible{border-color:var(--gold2);box-shadow:0 0 0 2px var(--gold2)}
.promo button svg{width:90%;height:90%}
.board-row{display:flex;gap:10px;align-items:stretch}
.evalbar{width:16px;border-radius:8px;position:relative;overflow:hidden;background:#1a1512;border:1px solid var(--line2);flex:none}
.eval-fill{position:absolute;left:0;right:0;bottom:0;height:50%;background:linear-gradient(180deg,#fffaf0,#d9cba8);transition:height .6s var(--ease)}
.evalbar span{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%) rotate(-90deg);font:700 10px var(--sans);color:var(--gold);mix-blend-mode:difference;white-space:nowrap}

/* player plates */
.plate{display:flex;align-items:center;gap:12px;padding:8px 14px;border:1px solid var(--line);border-radius:12px;background:rgba(0,0,0,.18);width:calc(var(--bs) + 2*clamp(10px,1.9vw,22px));transition:border-color .3s,background .3s}
.plate.turn{border-color:var(--gold);background:linear-gradient(90deg,rgba(201,166,94,.14),rgba(201,166,94,.02))}
.plate .disc{width:24px;height:24px}
.plate .who{flex:1;min-width:0;display:flex;flex-direction:column;line-height:1.2}
.plate .who b{font:600 17px var(--serif);color:var(--cream);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.plate .who span{font-size:12px;color:var(--muted);letter-spacing:.05em}
.plate .caps{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--muted)}
.plate .caps b{font:600 20px var(--serif);color:var(--gold2);min-width:1.2em;text-align:right}
.plate .think{display:none;font:italic 14px var(--serif);color:var(--gold2)}
.plate.thinking .think{display:inline}
.plate .net{width:9px;height:9px;border-radius:50%;background:#6fbf73;box-shadow:0 0 8px #6fbf73}.plate .net.off{background:#a05040;box-shadow:none}

/* side */
.side{display:flex;flex-direction:column;gap:14px;min-width:0}
.status-card{padding:16px 18px}
.status{font:500 21px/1.3 var(--serif);color:var(--cream);min-height:1.3em}
.status small{display:block;font:13px var(--sans);color:var(--muted);margin-top:4px}
.status .dots::after{content:"…";display:inline-block;animation:pulse 1.2s infinite}
.banner{margin-top:12px;padding:10px 12px;border-radius:10px;border:1px solid rgba(192,84,63,.6);background:rgba(192,84,63,.12);font-size:14px;color:#f0c9bd;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.banner.info{border-color:var(--line2);background:rgba(201,166,94,.08);color:var(--gold2)}
.banner .btn{padding:6px 12px;font-size:13px}
.controls{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:12px}
.controls .btn{padding:10px 8px;font-size:14px;justify-content:flex-start}
.ic{width:16px;height:16px;background:var(--gold);flex:none;-webkit-mask:var(--i) center/contain no-repeat;mask:var(--i) center/contain no-repeat}
.ic.undo{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 14L4 9l5-5'/%3E%3Cpath d='M4 9h10a6 6 0 0 1 0 12h-3'/%3E%3C/svg%3E")}
.ic.flip{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M7 4v16M7 20l-3-3M7 20l3-3M17 20V4M17 4l-3 3M17 4l3 3'/%3E%3C/svg%3E")}
.ic.draw{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round'%3E%3Cpath d='M5 9h14M5 15h14'/%3E%3C/svg%3E")}
.ic.flag{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 21V4M5 4h11l-2 4 2 4H5'/%3E%3C/svg%3E")}
.ic.new{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round'%3E%3Cpath d='M20 12a8 8 0 1 1-2.3-5.6M20 4v5h-5'/%3E%3C/svg%3E")}
.ic.menu{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round'%3E%3Cpath d='M4 7h16M4 12h16M4 17h16'/%3E%3C/svg%3E")}
.history-card{padding:14px 16px;display:flex;flex-direction:column;min-height:0}
.history-head{display:flex;align-items:center;justify-content:space-between;gap:8px}
.history-head h3{font:500 19px var(--serif);margin:0;color:var(--cream)}
.history-head .check{margin:0;font-size:12.5px}
.history{list-style:none;margin:10px 0 0;padding:0;max-height:min(34vh,330px);overflow:auto;font:14px/1.9 var(--sans);font-variant-numeric:tabular-nums;scrollbar-width:thin;scrollbar-color:var(--gold3) transparent}
.history li{display:grid;grid-template-columns:2.4em 1fr 1fr;padding:0 6px;border-radius:6px}
.history li:nth-child(odd){background:rgba(255,255,255,.025)}
.history li span:first-child{color:var(--muted)}
.history .cur{color:var(--gold2);font-weight:700}
.history:empty::before{content:"No moves yet.";color:var(--muted);font-style:italic}

/* dialog */
.overlay{position:fixed;inset:0;background:rgba(8,6,4,.62);backdrop-filter:blur(3px);display:grid;place-items:center;z-index:50;padding:16px;animation:fade .3s}
@keyframes fade{from{opacity:0}}
.dialog{width:min(460px,100%);padding:30px 28px 24px;text-align:center;animation:rise .4s var(--ease)}
@keyframes rise{from{transform:translateY(16px) scale(.98);opacity:0}}
.dlg-ornament{width:64px;height:64px;margin:0 auto 12px;border-radius:50%;border:1px solid var(--gold);display:grid;place-items:center;background:radial-gradient(circle,rgba(201,166,94,.18),transparent 70%)}
.dlg-ornament::before{content:"";width:30px;height:30px;background:linear-gradient(180deg,#f3dc9e,#b98f3e);-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M3 8l4.5 4L12 4l4.5 8L21 8l-2 10H5z M5 19.5h14V21H5z'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M3 8l4.5 4L12 4l4.5 8L21 8l-2 10H5z M5 19.5h14V21H5z'/%3E%3C/svg%3E") center/contain no-repeat}
.dialog h2{font:500 clamp(30px,5vw,40px)/1.1 var(--serif);margin:0 0 8px;color:var(--cream)}
.dialog p{margin:0 0 6px}
.dlg-stats{display:flex;justify-content:center;gap:24px;margin:16px 0 4px}
.dlg-stats div{display:flex;flex-direction:column}
.dlg-stats b{font:600 24px var(--serif);color:var(--gold2)}
.dlg-stats span{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.dlg-actions{display:flex;gap:10px;justify-content:center;margin-top:20px;flex-wrap:wrap}

.foot{text-align:center;padding:16px;color:var(--muted);font:italic 14px var(--serif);letter-spacing:.06em;border-top:1px solid var(--line);margin-top:12px}

/* responsive */

@media (max-width:900px){
  .game-wrap{grid-template-columns:1fr;justify-items:center}
  .game-wrap{--bs:max(260px,min(calc(100vw - 2*clamp(12px,3vw,36px) - 2*clamp(10px,1.9vw,22px)),calc(100vh - 230px),640px))}
  .side{width:min(100%,calc(var(--bs) + 44px))}
  .controls{grid-template-columns:repeat(3,1fr)}
  .history{max-height:220px}
}
@media (max-width:680px){
  .modes{grid-template-columns:1fr}
  .game-wrap{--bs:calc(100vw - 2*12px - 2*10px)}
  .screen{padding:12px}
  .topbar{padding:10px 12px}
  .brand{font-size:18px}
  .plate{padding:6px 10px}
  .plate .who b{font-size:15px}
  .status{font-size:18px}
  .controls .btn{font-size:13px;padding:9px 6px;gap:6px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* chess additions */
.disc.white{background:radial-gradient(circle at 35% 30%,#fffdf6,#d6c8a8 70%);box-shadow:0 0 0 1px var(--gold3)}
.brand-mark{background:conic-gradient(var(--gold) 0 25%,#2b3a2e 0 50%,var(--gold) 0 75%,#2b3a2e 0)}
#themeBtn{--ico:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M3 3h9v9H3zM12 12h9v9h-9z'/%3E%3Cpath d='M12 3h9v9h-9zM3 12h9v9H3z' fill-opacity='.35'/%3E%3C/svg%3E")}
.seg.four{grid-template-columns:repeat(4,1fr)}
.seg.four button{flex-direction:column;gap:3px;font-size:13px;padding:8px 4px}
.seg.four .pips{display:flex;gap:3px}.seg.four .pips i{width:5px;height:5px;border-radius:50%;border:1px solid var(--gold3)}.seg.four .pips i.f{background:var(--gold);border-color:var(--gold)}
.coach-opts{margin:6px 0 4px}.coach-opts .check{margin:8px 0 0;font-size:14px}
.plate .disc{width:22px;height:22px}
.plate .capt{display:flex;align-items:center;flex-wrap:wrap;max-width:46%;justify-content:flex-end;gap:0}
.plate .capt svg{width:24px;height:24px;margin-left:-7px;filter:drop-shadow(0 0 1px rgba(241,232,214,.55))}
.plate .capt .adv{font:600 14px var(--serif);color:var(--gold2);margin-left:6px}
.coach{padding:14px 16px}
.coach-head{display:flex;align-items:center;justify-content:space-between}
.coach-head h3{font:500 19px var(--serif);margin:0;color:var(--cream)}
.grade{font-size:12px;letter-spacing:.12em;text-transform:uppercase;padding:3px 9px;border-radius:20px;border:1px solid var(--line2);color:var(--muted)}
.grade:empty{display:none}
.grade.best,.grade.good{color:#9fd3a6;border-color:rgba(111,191,115,.5)}
.grade.inaccuracy{color:var(--gold2);border-color:var(--gold3)}
.grade.mistake{color:#f0b08a;border-color:rgba(214,120,80,.6)}
.grade.blunder{color:#ffb4a4;border-color:rgba(214,78,58,.8);background:rgba(214,78,58,.12)}
.coach-msg{margin:10px 0 0;font-size:14.5px;line-height:1.5;color:var(--text)}
.coach-msg b{color:var(--gold2)}
.coach.warn{border-color:rgba(214,78,58,.7);box-shadow:0 0 0 1px rgba(214,78,58,.35),0 18px 40px rgba(0,0,0,.35)}
.coach-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.coach-actions:empty{display:none}
.coach-actions .btn{padding:8px 12px;font-size:13.5px}
.coach-tools{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:12px}
.coach-tools .btn{padding:9px 8px;font-size:14px}
.ic.bulb{--i:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 18h6M10 21h4M12 3a6 6 0 0 0-3.5 10.9c.6.5 1 1.2 1 2.1h5c0-.9.4-1.6 1-2.1A6 6 0 0 0 12 3z'/%3E%3C/svg%3E")}
.history li{grid-template-columns:2.4em 1fr 1fr}
.history .san{cursor:default}
.history .bad{color:#f0a08a}
@media (max-width:900px){
  .modes{grid-template-columns:1fr 1fr}
  .board-row{justify-content:center}
}
@media (max-width:680px){
  .modes{grid-template-columns:1fr}
  .plate .capt svg{width:16px;height:16px}
}
.top-actions{display:flex;gap:8px}
.plate .capt{background:rgba(236,224,194,.16);border-radius:9px;padding:2px 8px 2px 12px}
.plate .capt:empty{display:none}