:root{color-scheme:dark}
.puzzles-document,.puzzles-page{height:auto;min-height:100%;overflow-x:hidden;overflow-y:auto}
.puzzles-page{margin:0;background:#0b111b;color:#edf2f8;overflow-x:hidden}
.puzzles-page .skip-link{position:fixed;top:-5rem;left:1rem;z-index:1100;padding:.7rem;background:#fff;color:#101722}
.puzzles-page .skip-link:focus{top:1rem}
.puzzles-page button,.puzzles-page select,.puzzles-page input{font:inherit}
.puzzles-page button{cursor:pointer}
.puzzles-page button:disabled{cursor:not-allowed;opacity:.56}
.puzzles-page :focus-visible{outline:2px solid #8fbaff;outline-offset:2px}
.puzzles-main{width:min(100%,1450px);box-sizing:border-box;margin:0 auto;padding:clamp(14px,2vw,30px)}
.puzzles-header{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:20px}
.puzzles-header h1{margin:2px 0 0;font-size:clamp(1.5rem,2.5vw,2.2rem);letter-spacing:-.025em}
.puzzles-header .eyebrow{margin:0;color:#92aad0;font-size:.85rem;text-transform:uppercase;letter-spacing:.14em;font-weight:750}
.puzzles-session{color:#a9b8cb;font-size:.92rem;white-space:nowrap}
.puzzles-categories{display:flex;gap:8px;overflow-x:auto;padding:0 0 14px;scrollbar-width:thin;scrollbar-color:#526783 transparent}
.puzzles-categories button{white-space:nowrap;border:1px solid #304056;background:#172233;color:#c9d5e5;border-radius:7px;padding:9px 15px;min-height:54px;font-size:.94rem;font-weight:650;display:grid;gap:3px;text-align:left}
.puzzles-categories small{color:#9eb1c9;font-size:.7rem;font-weight:500;font-variant-numeric:tabular-nums}
.puzzles-categories button[aria-current="true"]{background:#274f88;border-color:#6492ca;color:#fff}
.puzzles-categories button[aria-current="true"] small{color:#d8e9ff}
.puzzles-workspace{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(340px,.85fr);gap:clamp(14px,2vw,25px);align-items:start}
.puzzles-board-column{min-width:0;max-width:720px;width:100%;justify-self:center}
.puzzles-board-head,.puzzles-board-foot{display:flex;justify-content:space-between;align-items:center;gap:12px;color:#afc0d5;font-size:.9rem;min-height:36px}
.puzzles-board-head button{background:transparent;color:#a9c9f5;border:0;padding:6px 9px}
.puzzles-board-frame{width:100%;aspect-ratio:1;border:4px solid #26364c;box-sizing:border-box;border-radius:5px;overflow:hidden;background:#152131;box-shadow:0 15px 38px #0006}
.puzzles-board-frame .caissa-board{--caissa-board-light:#e6d3b1;--caissa-board-dark:#a7795b;--caissa-board-last-move:rgba(255,206,66,.58);width:100%;height:100%}
.puzzles-board-frame .caissa-board__highlight--last{box-shadow:inset 0 0 0 3px rgba(61,39,0,.48)}
.puzzles-board-foot{padding:0 3px}
.puzzles-panel{background:#111b29;border:1px solid #304056;border-radius:12px;display:flex;flex-direction:column;min-width:0;min-height:min(730px,calc(100dvh - 195px));max-height:730px;overflow:hidden}
.puzzles-panel-head,.puzzles-panel-foot{flex:none;background:#142132}
.puzzles-tabs{display:grid;grid-template-columns:repeat(3,1fr)}
.puzzles-tabs button{border:0;border-bottom:2px solid transparent;background:transparent;color:#a9b8cb;font-weight:700;padding:17px 9px;min-height:52px}
.puzzles-tabs button[aria-selected="true"]{color:#fff;border-color:#73a9ee;background:#1a2b40}
.puzzles-panel-body{flex:1;min-height:0;overflow-y:auto;padding:20px 22px;scrollbar-width:thin}
.puzzles-panel-body [hidden]{display:none}
#panel-training:not([hidden]){display:flex;flex-direction:column;min-height:100%;box-sizing:border-box}
.puzzles-prompt h2,.puzzles-panel-body h2{font-size:1.23rem;margin:0 0 8px}
.puzzles-prompt p,.panel-note{color:#b4c2d2;line-height:1.45;margin:0 0 18px;font-size:.94rem}
.puzzles-actions{display:flex;gap:8px;margin:12px 0 23px}
.puzzles-actions button,.puzzles-continue{background:#1c314b;border:1px solid #41648a;border-radius:7px;color:#dbeaff;min-height:42px;padding:9px 13px}
.puzzles-panel-body h3{font-size:.93rem;color:#d3e0ef;margin:0 0 9px}
.puzzles-moves{display:flex;flex-wrap:wrap;gap:7px 13px;align-content:start;list-style:none;background:#0d1623;border:1px solid #29394e;border-radius:8px;min-height:110px;padding:13px;margin:0 0 21px;color:#d6e1ee;font-variant-numeric:tabular-nums}
.puzzles-moves li{font-size:.95rem}.puzzles-moves .opponent{color:#92a8c1}.puzzles-moves .move-number{color:#748aa6;margin-right:5px}
.puzzles-moves .review-current{color:#fff;background:#294a70;border-radius:4px;padding:1px 4px}
.puzzles-review{display:flex;align-items:center;justify-content:space-between;gap:5px;margin:auto 0 0;padding-top:20px;color:#a9bdd4;font-size:.8rem}
.puzzles-review button{border:1px solid #344962;background:#1a2b40;color:#dce9f7;border-radius:6px;min-width:36px;min-height:36px}
.puzzles-review button:disabled{opacity:.52}
.puzzles-engine-controls{display:grid;grid-template-columns:1fr;align-items:center;gap:8px;border-top:1px solid #304056;padding-top:18px}
.puzzles-engine-controls button{background:#2c67a8;border:1px solid #6aa2df;border-radius:8px;color:#fff;min-height:44px;padding:10px 14px;font-weight:750;text-align:center}
.puzzles-engine-controls button[aria-pressed="true"]{background:#6e3340;border-color:#d6818f}
#engine-state{color:#9eb1c9;font-size:.87rem;text-align:left}
.puzzles-engine-output{min-height:72px;margin:8px 0 12px;padding:10px 12px;border:1px solid #2c405a;border-radius:8px;background:#0d1623;color:#c6d9ed;font-size:.88rem;word-break:break-word}
.puzzles-engine-output p{margin:3px 0;line-height:1.4}.puzzles-engine-output p:empty{display:none}.puzzles-eval{font-variant-numeric:tabular-nums}
.puzzles-continue{width:100%;font-weight:700;background:#254572}
.puzzles-engine-match{margin:12px 0 18px;padding:14px;border:1px solid #30465f;border-radius:9px;background:#121f2f}
.puzzles-engine-match h3{margin-bottom:10px}.puzzles-match-controls{display:grid;grid-template-columns:1.45fr 1fr 1fr;gap:7px}
.puzzles-match-controls button{min-height:40px;border:1px solid #466381;border-radius:7px;background:#1b3048;color:#e5f0fb;padding:8px;font-weight:650}
#engine-match-state{margin:9px 0 0;color:#9eb1c9;font-size:.84rem}
#engine-match-moves{display:flex;flex-wrap:wrap;gap:5px 12px;max-height:96px;overflow-y:auto;list-style:none;margin:9px 0 0;padding:0;color:#d5e2ef;font-size:.86rem;font-variant-numeric:tabular-nums}
.puzzles-panel-foot{display:flex;gap:14px;align-items:center;justify-content:space-between;padding:13px 20px;border-top:1px solid #304056}
.puzzles-next{background:#3170b6;color:#fff;border:1px solid #5e9bde;border-radius:8px;font-weight:750;padding:11px 19px;min-height:45px}
.puzzles-panel-foot a,.puzzles-attribution a{color:#9cc9ff}
.puzzles-panel-foot a{font-size:.85rem}
.puzzles-subthemes{display:grid;gap:8px;margin-top:10px}
.puzzles-subthemes button{text-align:left;display:flex;justify-content:space-between;gap:12px;background:#172639;color:#dbe6f5;border:1px solid #344962;border-radius:8px;padding:13px 14px;min-height:48px}
.puzzles-subthemes button[aria-pressed="true"]{border-color:#83b5f1;background:#23436a}
.puzzles-subthemes small{color:#a8bad0;font-size:.8rem}
#panel-stats label{display:block;margin:22px 0 9px;font-weight:700}
#panel-stats input[type=range],#panel-stats select{width:100%}
#panel-stats select{background:#1b2d44;border:1px solid #587498;color:#f3f7ff;border-radius:7px;padding:10px}
#rating-output{float:right;color:#aaceff}
.puzzles-rating-card{display:grid;gap:6px;padding:20px;border:1px solid #3b5270;border-radius:10px;background:#1a2b41;color:#bacee7}
.puzzles-rating-card strong{font-size:2.65rem;color:#f1f6ff;font-variant-numeric:tabular-nums;line-height:1.1}
.puzzles-stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:12px 0 18px}
.puzzles-stats-grid div{display:grid;gap:4px;padding:13px;background:#172639;border-radius:8px;color:#bacee7}
.puzzles-stats-grid strong{font-size:1.35rem;color:#fff}
.puzzles-detail{display:grid;gap:5px;padding:13px 15px;background:#1a2b41;border:1px solid #344962;border-radius:8px;margin-bottom:20px;color:#bdcfe5}
.puzzles-detail span:first-child{font-size:1.05rem;font-weight:700;color:#fff}
.puzzles-theme-tags{display:flex;flex-wrap:wrap;gap:7px;margin:10px 0 21px}
.puzzles-theme-tags span{padding:6px 9px;background:#1e324b;border:1px solid #395370;border-radius:6px;color:#d0e2f5;font-size:.82rem}
.puzzles-progress-heading{border-top:1px solid #304056;padding-top:20px}
#progress-source{color:#9cc9ff;font-size:.87rem}
.puzzles-auto-next{display:flex!important;align-items:center;gap:9px;font-weight:500!important}
.puzzles-auto-next input{width:18px;height:18px;accent-color:#72a8ed}
.puzzles-attribution{color:#91a6bd;font-size:.82rem;line-height:1.5;margin:18px 0}
.puzzles-promotion{position:fixed;inset:0;width:min(92vw,460px);box-sizing:border-box;margin:auto;border:1px solid #6382a8;border-radius:14px;background:#111b29;color:#f1f6fd;padding:22px;box-shadow:0 24px 80px #000b}
.puzzles-promotion::backdrop{background:rgba(2,7,14,.78);backdrop-filter:blur(3px)}
.puzzles-promotion form{display:grid;gap:14px}.puzzles-promotion h2{margin:0;font-size:1.25rem}.puzzles-promotion p{margin:0;color:#b8c7d9}
.puzzles-promotion-options{display:grid;grid-template-columns:repeat(4,1fr);gap:9px}
.puzzles-promotion-options button{display:grid;place-items:center;aspect-ratio:1;min-width:0;border:1px solid #56769d;border-radius:10px;background:#1a2c43;color:#fff;font-size:clamp(2.4rem,10vw,4rem);line-height:1;text-shadow:0 2px 2px #0008}
.puzzles-promotion[data-piece-color="black"] .puzzles-promotion-options button{background:#e9dcc1;color:#0a111b;text-shadow:0 1px 0 #fff8;border-color:#b99f72}
.puzzles-promotion[data-piece-color="black"] .puzzles-promotion-options button:hover,.puzzles-promotion[data-piece-color="black"] .puzzles-promotion-options button:focus-visible{background:#f6e9cd;border-color:#eab657;outline:3px solid #79adff;outline-offset:2px}
.puzzles-promotion-options button:hover,.puzzles-promotion-options button:focus-visible{background:#294d77;border-color:#9ccaff}
.puzzles-promotion-cancel{justify-self:end;border:1px solid #4d6380;border-radius:7px;background:#172538;color:#d8e5f4;min-height:40px;padding:8px 14px}
@media(max-width:920px){.puzzles-workspace{grid-template-columns:minmax(0,1fr)}.puzzles-board-column{max-width:min(100%,640px)}.puzzles-panel{min-height:470px;max-height:none}.puzzles-panel-body{min-height:330px;max-height:460px}.puzzles-header{margin-bottom:12px}}
@media(max-width:520px){.puzzles-main{padding:10px 10px 22px}.puzzles-header{align-items:start;padding-left:58px;min-height:46px}.puzzles-header h1{font-size:1.45rem}.puzzles-header .eyebrow{font-size:.7rem}.puzzles-session{white-space:normal;text-align:right;max-width:96px;font-size:.8rem}.puzzles-board-frame{border-width:2px}.puzzles-panel-body{padding:17px}.puzzles-panel-foot{padding:11px 14px}.puzzles-match-controls{grid-template-columns:1fr 1fr}.puzzles-match-controls #engine-match-start{grid-column:1/-1}.puzzles-promotion{padding:18px}.puzzles-promotion-options{gap:6px}}
@media(max-width:360px){.puzzles-header h1{font-size:1.22rem}.puzzles-session{max-width:70px;font-size:.75rem}}