:root{--primary:#327ceb;--primary-dark:#05b2fd;--bg-light:#f8fafc;--text-light:#1e293b;--card-light:#fff;--border-light:#e2e8f0;--success:#10b981;--warning:#f59e0b}
[data-theme="dark"]{--bg-light:#0f1727;--text-light:#f1f5f9;--card-light:#1e293b;--border-light:#334155}
.ch-root *,.ch-root ::before,.ch-root ::after{box-sizing:border-box;margin:0;padding:0}
.ch-root{color:var(--text-light);width:100%;overflow-x:hidden}
@keyframes chPulse {
0%,100%{opacity:1}
50%{opacity:.35}
}
@keyframes chSlide {
from{transform:translateY(-20px) scale(.95);opacity:0}
to{transform:none;opacity:1}
}
@keyframes chFadeIn {
from{opacity:0}
to{opacity:1}
}
.ch-heading{display:flex;align-items:center;gap:.9rem;margin-bottom:.4rem}
.ch-heading::before{content:'';display:block;width:5px;height:36px;background:linear-gradient(180deg,var(--primary),var(--primary-dark));border-radius:3px;flex-shrink:0}
.ch-heading h2{font-size:1.45rem;font-weight:700;color:var(--text-light)}
.ch-sub{font-size:.84rem;opacity:.5;margin-bottom:1.1rem;padding-left:14px;line-height:1.5}
.ch-wrap{display:grid;grid-template-columns:auto 1fr;gap:1.2rem;align-items:start}
.ch-bw{display:flex;min-width:0}
.ch-bb{display:flex;flex-direction:column;gap:4px;min-width:0}
.ch-bb-row{display:flex;gap:4px;align-items:flex-start;min-width:0}
.ch-rc{display:flex;flex-direction:column;justify-content:space-around;width:18px;min-width:18px;flex-shrink:0}
.ch-rr{display:flex;justify-content:space-around;height:18px;padding-left:22px}
.ch-rc span,.ch-rr span{font-size:.75rem;font-weight:600;color:var(--text-light);opacity:.55;display:flex;align-items:center;justify-content:center;line-height:1;letter-spacing:.02em}
.ch-bd{display:grid;grid-template-columns:repeat(8,var(--csq,52px));grid-template-rows:repeat(8,var(--csq,52px));border:2.5px solid #1a2744;border-radius:3px;overflow:hidden;user-select:none;touch-action:manipulation;flex-shrink:0}
.sq{display:flex;align-items:center;justify-content:center;position:relative;cursor:pointer}
.sq.lt{background:#f0d9b5}
.sq.dk{background:#b58863}
.sq.sel{background:#f6f669!important}
.sq.llt{background:#cdd26a!important}
.sq.ldk{background:#aaa23a!important}
.sq.chk{background:#ff5050!important}
.sq:active{filter:brightness(1.09)}
.sq.hint::after{content:'';position:absolute;width:30%;height:30%;background:#0000002e;border-radius:50%;pointer-events:none}
.sq.hint.occ::after{width:100%;height:100%;border-radius:0;background:transparent;border:3px solid #00000038;box-sizing:border-box}
.pc{font-size:var(--cpc,34px);line-height:1;display:block;text-align:center;pointer-events:none;position:relative;z-index:2;transition:transform .1s}
.pc.w{color:#fff;text-shadow:-1.5px -1.5px 0 #111,1.5px -1.5px 0 #111,-1.5px 1.5px 0 #111,1.5px 1.5px 0 #111,0 -2px 0 #111,0 2px 0 #111,-2px 0 0 #111,2px 0 0 #111}
.pc.b{color:#1a1a1a;text-shadow:-.5px -.5px 0 #7a5c3a,.5px -.5px 0 #7a5c3a,-.5px .5px 0 #7a5c3a,.5px .5px 0 #7a5c3a}
.sq.sel .pc,.sq:active .pc{transform:scale(1.13)}
.ch-side{display:flex;flex-direction:column;gap:.6rem}
.ch-prow{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}
.ch-pl{display:flex;align-items:center;gap:.45rem;padding:.6rem .75rem;border-radius:.8rem;border:2px solid var(--border-light);background:var(--bg-light);transition:all .25s;min-width:0}
.ch-pl.on{border-color:var(--primary);background:#327ceb0f;box-shadow:0 0 0 3px #327ceb21}
.ch-av{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.1rem;flex-shrink:0}
.ch-av.w{background:#f1f5f9;color:#1e293b;border:2px solid #94a3b8}
.ch-av.b{background:#1e293b;color:#f1f5f9;border:2px solid #475569}
.ch-pinfo{flex:1;min-width:0}
.ch-pname{font-weight:600;font-size:.82rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ch-pcap{display:flex;flex-wrap:wrap;gap:1px;font-size:10px;line-height:1;min-height:12px;margin-top:1px}
.ch-padv{font-size:.66rem;font-weight:600;color:var(--success);margin-left:2px}
.ch-ptm{font-size:.84rem;font-weight:600;font-variant-numeric:tabular-nums;color:var(--primary);min-width:32px;text-align:right;flex-shrink:0}
.ch-ptm.low{color:#dc2626;animation:chPulse 1s infinite}
.ch-stat{display:flex;align-items:center;justify-content:center;gap:.4rem;padding:.55rem .8rem;border-radius:.8rem;min-height:40px;font-weight:700;font-size:.92rem;text-align:center;background:var(--bg-light);border:2px solid var(--border-light);transition:all .25s}
.ch-stat.chk{border-color:#dc2626;color:#dc2626;background:#fee2e2}
.ch-stat.mate{border-color:var(--success);color:var(--success);background:#dcfce7}
.ch-stat.stale{border-color:var(--warning);color:var(--warning);background:#fef3c7}
.ch-btns{display:grid;grid-template-columns:1fr 1fr;gap:.45rem}
.ch-btn{display:flex;align-items:center;justify-content:center;gap:.3rem;padding:.5rem .75rem;border:none;border-radius:.75rem;font-weight:600;font-size:.84rem;cursor:pointer;white-space:nowrap;transition:all .2s;min-height:38px}
.ch-btn.p{background:var(--primary);color:#fff}
.ch-btn.p:hover{background:#1a6dd4;transform:translateY(-1px);box-shadow:0 4px 12px #327ceb4d}
.ch-btn.s{background:var(--bg-light);color:var(--text-light);border:2px solid var(--border-light)}
.ch-btn.s:hover{border-color:var(--primary);color:var(--primary)}
.ch-btn.fw{grid-column:1 / -1;padding:.6rem;min-height:42px;font-size:.9rem}
.ch-card{background:var(--card-light);border-radius:.9rem;border:1px solid var(--border-light);box-shadow:0 4px 14px #00000012;padding:.75rem;transition:background .3s,border .3s}
.ch-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:.1rem;margin-bottom:.55rem;border-bottom:2px solid var(--border-light)}
.ch-tab{padding:.4rem;background:none;border:none;font-weight:600;font-size:.82rem;cursor:pointer;color:var(--text-light);opacity:.45;border-radius:.4rem .4rem 0 0;transition:all .18s;text-align:center;width:100%}
.ch-tab.on{opacity:1;background:var(--primary);color:#fff}
.ch-pane{display:none}
.ch-pane.on{display:block}
.ch-mvs{max-height:280px;overflow-y:auto}
.ch-mvs::-webkit-scrollbar{width:3px}
.ch-mvs::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:2px}
.ch-mvt{width:100%;border-collapse:collapse;font-size:.78rem}
.ch-mvt tr:nth-child(even) td{background:var(--bg-light)}
.ch-mvt td{padding:.18rem .32rem}
.ch-mvt td:first-child{font-weight:600;opacity:.28;width:20px}
.ch-mvc{cursor:pointer}
.ch-mvc:hover{background:#327ceb1f!important;color:var(--primary)}
.ch-sr{display:flex;align-items:center;justify-content:space-between;padding:.35rem 0;border-bottom:1px solid var(--border-light);font-size:.8rem}
.ch-sr:last-child{border-bottom:none}
.ch-sl{font-weight:500}
.ch-tog{position:relative;width:34px;height:19px;background:var(--border-light);border-radius:10px;cursor:pointer;transition:background .25s;flex-shrink:0}
.ch-tog.on{background:var(--primary)}
.ch-tog::after{content:'';position:absolute;top:2px;left:2px;width:15px;height:15px;background:#fff;border-radius:50%;transition:left .25s}
.ch-tog.on::after{left:17px}
.ch-sel{padding:.15rem .35rem;border:1px solid var(--border-light);border-radius:.4rem;background:var(--bg-light);color:var(--text-light);font-size:.77rem;max-width:130px}
.ch-svl{display:flex;flex-direction:column;gap:.28rem}
.ch-svi{display:flex;align-items:center;gap:.4rem;padding:.4rem .5rem;background:var(--bg-light);border:1px solid var(--border-light);border-radius:.65rem;cursor:pointer;font-size:.76rem;transition:all .18s}
.ch-svi:hover{border-color:var(--primary);background:#327ceb0d}
.ch-svi > i{color:var(--primary);width:12px;flex-shrink:0}
.ch-svn{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0}
.ch-svd{font-size:.65rem;opacity:.4}
.ch-svx{background:none;border:none;cursor:pointer;color:#dc2626;opacity:.35;padding:.08rem;flex-shrink:0;transition:opacity .2s}
.ch-svx:hover{opacity:1}
.ch-nosv{text-align:center;opacity:.3;font-size:.76rem;padding:.5rem 0}
.ch-hg{display:grid;grid-template-columns:repeat(3,1fr);gap:.28rem}
.ch-hp{text-align:center;padding:.3rem;background:var(--bg-light);border-radius:.4rem}
.ch-hs{font-size:1.15rem}
.ch-hn{font-size:.6rem;opacity:.5}
.ch-ht{font-size:.74rem;opacity:.5;margin-top:.5rem;line-height:1.75}
.ch-ov{position:fixed;inset:0;z-index:2000;display:none;align-items:center;justify-content:center;background:#000000a6;backdrop-filter:blur(5px)}
.ch-ov.on{display:flex}
.ch-conf-ov{z-index:2050}
.ch-go-ov{z-index:2100;background:none}
.ch-gobg{position:absolute;inset:0;background:#000000b8;backdrop-filter:blur(5px)}
.ch-pbox{background:var(--card-light);border-radius:1.1rem;padding:1.3rem;text-align:center;box-shadow:0 20px 60px #00000059;animation:chSlide .3s ease-out}
.ch-pbox h3{font-size:.95rem;font-weight:700;margin-bottom:.8rem;color:var(--text-light)}
.ch-ppcs{display:flex;gap:.4rem;justify-content:center}
.ch-pb{width:54px;height:54px;font-size:32px;background:var(--bg-light);border:2px solid var(--border-light);border-radius:.65rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .18s}
.ch-pb:hover{border-color:var(--primary);transform:scale(1.08)}
.ch-gobox{position:relative;z-index:1;background:var(--card-light);border-radius:2rem;padding:2.5rem 2rem 2rem;max-width:420px;width:92%;text-align:center;box-shadow:0 25px 70px #0006;animation:chSlide .35s ease-out}
.ch-goi{font-size:3.4rem;margin-bottom:.45rem}
.ch-got{font-size:1.4rem;font-weight:600;margin-bottom:.25rem}
.ch-gos{opacity:.55;margin-bottom:1rem;font-size:.86rem}
.ch-gost{display:flex;gap:1.5rem;justify-content:center;margin-bottom:1rem}
.ch-gsv{font-size:1.2rem;font-weight:600;color:var(--primary)}
.ch-gsl{font-size:.64rem;opacity:.4}
.ch-cfbox{background:var(--card-light);border-radius:1.5rem;padding:2.5rem 2rem 2rem;max-width:420px;width:92%;text-align:center;box-shadow:0 25px 70px #00000059;animation:chSlide .3s ease-out}
.ch-cfbox .ch-cfi{font-size:3.5rem;margin-bottom:.75rem}
.ch-cfbox h3{font-size:1.4rem;font-weight:600;margin-bottom:.5rem}
.ch-cfbox p{opacity:.58;font-size:.95rem;margin-bottom:1.5rem}
.chess-guide{margin-top:3rem}
.guide-header{display:flex;align-items:center;gap:1rem;margin-bottom:1.75rem}
.guide-header::before{content:'';display:block;width:5px;height:40px;background:linear-gradient(180deg,var(--primary),var(--primary-dark));border-radius:3px;flex-shrink:0}
.guide-header h2{font-size:1.5rem;font-weight:600;color:var(--text-light)}
.guide-pieces{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.9rem;margin-bottom:2.25rem}
.guide-piece-card{background:var(--card-light);border:1px solid var(--border-light);border-radius:1.1rem;padding:1.1rem .9rem;text-align:center;box-shadow:0 3px 12px #0000000f;transition:all .3s;position:relative;overflow:hidden}
.guide-piece-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--primary-dark));opacity:0;transition:opacity .3s}
.guide-piece-card:hover{transform:translateY(-3px);border-color:var(--primary)}
.guide-piece-card:hover::before{opacity:1}
.guide-piece-icon{font-size:2.6rem;display:block;margin-bottom:.4rem}
.guide-piece-name{font-size:.95rem;font-weight:600;margin-bottom:.25rem}
.guide-piece-points{display:inline-block;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;font-size:.68rem;font-weight:600;padding:.12rem .5rem;border-radius:2rem;margin-bottom:.45rem}
.guide-piece-desc{font-size:.77rem;opacity:.65;line-height:1.5}
.guide-sections{display:grid;grid-template-columns:repeat(3,1fr);gap:1.1rem;margin-bottom:2rem}
.guide-section-card{background:var(--card-light);border:1px solid var(--border-light);border-radius:1.1rem;padding:1.35rem 1.25rem;box-shadow:0 3px 12px #0000000f;transition:border-color .25s}
.guide-section-card:hover{border-color:var(--primary)}
.guide-section-title{font-size:1rem;font-weight:600;color:var(--text-light);margin-bottom:.55rem;padding-bottom:.5rem;border-bottom:2px solid var(--border-light)}
.guide-section-text{font-size:.83rem;color:var(--text-light);opacity:.7;line-height:1.7}
.guide-section-text strong{color:var(--primary);font-weight:600;opacity:1}
.guide-steps{background:var(--card-light);border:1px solid var(--border-light);border-radius:1.1rem;padding:1.5rem;box-shadow:0 3px 12px #0000000f}
.guide-steps-title{font-size:1.1rem;font-weight:600;margin-bottom:1.2rem;color:var(--text-light)}
.guide-step{display:flex;gap:1rem;align-items:flex-start;position:relative}
.guide-step:not(:last-child){margin-bottom:1.1rem}
.guide-step:not(:last-child)::after{content:'';position:absolute;left:19px;top:40px;width:2px;height:calc(100% - 8px);background:linear-gradient(180deg,var(--primary),transparent);opacity:.2}
.guide-step-num{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;font-weight:600;font-size:.9rem;display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:0 4px 12px #327ceb4d}
.guide-step-content h4{font-size:.92rem;font-weight:600;margin-bottom:.2rem}
.guide-step-content p{font-size:.81rem;opacity:.65;line-height:1.6}
@media (max-width: 860px) {
.ch-wrap{grid-template-columns:1fr;gap:.65rem}
.ch-sub{display:none}
.ch-side{gap:.5rem}
.ch-btns{grid-template-columns:1fr 1fr}
.ch-btn{min-height:46px;font-size:.9rem;padding:.62rem .8rem}
.ch-btn.fw{min-height:50px;font-size:.95rem}
.ch-card{padding:.7rem}
.ch-mvs{max-height:140px}
.ch-stat{min-height:46px;font-size:.9rem}
.ch-tab{padding:.4rem .55rem;font-size:.78rem}
}
@media (max-width: 480px) {
.ch-prow{gap:.4rem}
.ch-pl{padding:.6rem .75rem;gap:.45rem}
.ch-av{width:32px;height:32px;font-size:1.1rem}
.ch-pname{font-size:.84rem}
.ch-ptm{font-size:.84rem;min-width:30px}
.ch-btn{min-height:48px;font-size:.92rem}
.ch-btn.fw{min-height:52px;font-size:.97rem}
.ch-stat{min-height:48px;font-size:.92rem;padding:.55rem .75rem}
.ch-card{padding:.65rem;border-radius:.85rem}
.ch-tab{font-size:.8rem;padding:.38rem .48rem}
.ch-mvs{max-height:120px}
.guide-pieces{grid-template-columns:repeat(2,1fr);gap:.75rem}
.guide-piece-icon{font-size:2.2rem}
.guide-piece-name{font-size:.9rem}
.guide-piece-desc{font-size:.78rem}
.guide-sections{grid-template-columns:1fr}
.guide-steps{padding:1.15rem}
}
@media (max-width: 360px) {
.ch-pl{padding:.5rem .6rem;gap:.35rem}
.ch-av{width:28px!important;height:28px!important;font-size:.95rem!important}
.ch-pname{font-size:.78rem}
.ch-ptm{font-size:.78rem;min-width:26px}
.ch-btn{font-size:.84rem;padding:.54rem}
.ch-tab{font-size:.74rem;padding:.32rem .36rem}
.ch-stat{font-size:.86rem}
.guide-pieces{grid-template-columns:repeat(2,1fr)}
}