:root{color-scheme:light dark;--bg:#f3f3f3;--panel:#fff;--panel-soft:rgba(255,255,255,.78);--text:#050505;--muted:#747781;--line:#dedede;--shadow:0 18px 45px rgba(20,24,32,.1);--x:#ff406d;--dark:#2d3748;--light:#f8fafc}
[data-theme=dark]{--bg:#13151b;--panel:#1c2029;--panel-soft:rgba(28,32,41,.86);--text:#f6f7fb;--muted:#a0a6b5;--line:#323846;--shadow:0 22px 55px rgba(0,0,0,.34)}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#13151b;--panel:#1c2029;--panel-soft:rgba(28,32,41,.86);--text:#f6f7fb;--muted:#a0a6b5;--line:#323846;--shadow:0 22px 55px rgba(0,0,0,.34)}}
*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:Arial,Helvetica,sans-serif;color:var(--text);background:radial-gradient(circle at top,rgba(255,64,109,.08),transparent 34rem),var(--bg)}button,input{font:inherit}button{border:0;cursor:pointer}.app-shell{width:min(100% - 28px,620px);min-height:100vh;margin:0 auto;padding:20px 0 22px;display:flex;flex-direction:column;align-items:center}.brand{display:flex;align-items:center;justify-content:center;gap:16px;margin-bottom:22px}.brand h1{margin:0;font-size:clamp(2.45rem,8vw,3.15rem);line-height:1;font-weight:900}.brand-icon{width:clamp(3rem,10vw,4rem);height:clamp(3rem,10vw,4rem);display:grid;place-items:center;color:var(--x);filter:drop-shadow(0 8px 10px rgba(255,64,109,.25))}.brand-icon svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:2.3;stroke-linecap:round;stroke-linejoin:round}.panel,.game-view{width:100%}.menu-panel{padding:22px;border:1px solid var(--line);border-radius:18px;background:var(--panel-soft);box-shadow:var(--shadow)}.menu-actions{display:grid;gap:14px}.primary-btn,.join-btn,.pill-btn,.copy-btn,.back-home-btn{min-height:44px;border-radius:11px;color:var(--text);background:var(--panel);box-shadow:0 8px 22px rgba(15,18,25,.08);font-weight:850}.primary-btn,.join-btn{color:#fff;background:linear-gradient(135deg,var(--x),#ff7a95)}.primary-btn{min-height:52px}.join-card{display:grid;gap:7px}.join-card label,.room-strip span{color:var(--muted);font-size:.88rem}.join-row{display:grid;grid-template-columns:1fr auto;gap:10px}input{height:46px;border:1px solid var(--line);border-radius:10px;padding:0 14px;color:var(--text);background:var(--panel);text-transform:uppercase;letter-spacing:.08em}.hint,.error-text,.sync-text,.footer{text-align:center}.hint{margin:16px 0 0;color:var(--muted)}.error-text{min-height:22px;margin:12px 0 0;color:var(--x);font-weight:800}.back-home-btn{width:fit-content;margin:18px auto 0;padding:0 16px;display:flex;align-items:center;justify-content:center;text-decoration:none}.top-actions{display:flex;justify-content:center;gap:10px;margin-bottom:8px}.pill-btn{padding:0 18px}.room-strip{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:10px;width:min(100%,520px);margin:0 auto 12px;padding:10px 12px;border:1px solid var(--line);border-radius:14px;background:var(--panel-soft)}.room-strip div{display:grid;text-align:center}.copy-btn{padding:0 14px}.board{width:min(100%,520px);aspect-ratio:1;display:grid;grid-template-columns:repeat(8,1fr);grid-template-rows:repeat(8,1fr);border:4px solid color-mix(in srgb,var(--text) 45%,var(--line));border-radius:18px;overflow:hidden;box-shadow:0 16px 34px rgba(15,18,25,.14)}.square{display:grid;place-items:center;position:relative}.square.light{background:#f8fafc}.square.dark{background:#2d3748}.square.selected{outline:4px solid var(--x);outline-offset:-4px}.square.target::after{content:"";width:22%;height:22%;border-radius:999px;background:var(--x)}.piece{width:74%;height:74%;border-radius:12px;display:grid;place-items:center;font-weight:900;font-size:clamp(1.05rem,5vw,1.9rem);box-shadow:0 8px 16px rgba(0,0,0,.22)}.piece.w{color:#111827;background:#fff}.piece.b{color:#fff;background:#111827}.status-text{min-height:36px;margin:22px 0 4px;text-align:center;font-size:clamp(1.35rem,4.8vw,1.75rem)}.sync-text{min-height:22px;margin:0;color:var(--muted)}.footer{margin-top:auto;padding-top:24px;color:var(--muted)}.hidden{display:none!important}@media(max-width:520px){.app-shell{width:min(100% - 20px,420px)}.top-actions,.join-row,.room-strip{grid-template-columns:1fr;display:grid}.pill-btn,.join-btn,.copy-btn,.back-home-btn{width:100%}.board{border-radius:14px}}