:root{--practice-ink:#18332b;--practice-green:#245840;--practice-sage:#dce8d4;--practice-cream:#f8f6ef;--practice-paper:#fffdf8;--practice-gold:#d8ad52;--practice-line:#d9ddd1;--practice-muted:#607168}.practice-page{background:var(--practice-cream);color:var(--practice-ink);min-height:100vh}.practice-page .page-width{margin-inline:auto;width:min(1180px,calc(100% - 40px))}.practice-hero{align-items:center;display:grid;gap:clamp(32px,7vw,90px);grid-template-columns:minmax(0,1.3fr) minmax(270px,.7fr);padding-block:clamp(54px,8vw,104px) 48px}.practice-eyebrow{color:#4d754f;font-size:12px;font-weight:800;letter-spacing:.13em;margin:0 0 12px;text-transform:uppercase}.practice-hero h1{font-size:clamp(42px,6vw,78px);letter-spacing:-.055em;line-height:.98;margin:0;max-width:850px}.practice-hero h1 span{color:#4f7b55}.practice-hero__lead{color:#465a51;font-size:clamp(17px,2vw,21px);line-height:1.58;margin:24px 0 0;max-width:720px}.practice-hero__aside{background:#eef2e7;border:1px solid #d8ded1;border-radius:28px;box-shadow:0 18px 50px #21403212;padding:26px}.practice-hero__aside strong{display:block;font-size:20px;margin-bottom:10px}.practice-hero__aside p{color:#52645b;line-height:1.6;margin:0}.practice-nav{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}.practice-link,.practice-nav a{align-items:center;background:#f9faf5;border:1px solid #bccbb9;border-radius:999px;color:#214f38;display:inline-flex;font-weight:750;min-height:42px;padding:9px 15px;text-decoration:none}.practice-link:hover,.practice-nav a:hover{background:#e8efe2;border-color:#6f9472}.practice-section{padding-block:46px 80px}.practice-section__heading{align-items:end;display:flex;gap:30px;justify-content:space-between;margin-bottom:28px}.practice-section__heading h2{font-size:clamp(30px,4vw,48px);letter-spacing:-.045em;line-height:1.05;margin:0}.practice-section__heading>p{color:var(--practice-muted);line-height:1.6;margin:0;max-width:560px}.practice-card-grid{display:grid;gap:16px;grid-template-columns:repeat(3,minmax(0,1fr))}.practice-card{background:var(--practice-paper);border:1px solid var(--practice-line);border-radius:22px;display:flex;flex-direction:column;min-height:240px;padding:24px}.practice-card>span{color:#4e7a55;font-size:11px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}.practice-card h2,.practice-card h3{font-size:24px;letter-spacing:-.03em;line-height:1.15;margin:14px 0 10px}.practice-card p{color:var(--practice-muted);line-height:1.58;margin:0}.practice-card a{color:#245840;font-weight:800;margin-top:auto;padding-top:22px;text-decoration:none}.practice-card a:hover{text-decoration:underline;text-underline-offset:4px}.practice-followup{display:grid;gap:12px;grid-template-columns:repeat(3,minmax(0,1fr));margin-block:10px 80px}.practice-followup a{background:#e9eee2;border-radius:18px;color:var(--practice-ink);padding:20px;text-decoration:none}.practice-followup a strong{display:block;margin-bottom:6px}.practice-followup a span{color:#5c6d64;font-size:14px;line-height:1.45}.practice-primary{align-items:center;background:var(--practice-green);border:1px solid #173e2c;border-radius:12px;color:#fff;cursor:pointer;display:inline-flex;font:inherit;font-weight:800;justify-content:center;min-height:46px;padding:11px 18px;text-decoration:none}.practice-primary:hover{background:#326a49}.puzzle-trainer{background:#fffdf8;border:1px solid #d4dacd;border-radius:30px;box-shadow:0 24px 70px #1c3a2b13;margin-block:24px 70px;overflow:hidden}.puzzle-levels{align-items:center;background:#f8f6ee;border:0;border-bottom:1px solid #d4dacd;display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:16px 20px}.puzzle-levels legend{color:#48604f;font-size:11px;font-weight:800;letter-spacing:.08em;padding:0;text-transform:uppercase;width:100%}.puzzle-levels button{background:#fff;border:1px solid #c8d1c3;border-radius:999px;color:#315b41;cursor:pointer;font:inherit;font-size:11px;font-weight:750;min-height:36px;padding:7px 11px}.puzzle-levels button[aria-pressed=true]{background:#315b41;border-color:#315b41;color:#fff}.puzzle-trainer__topline{background:#e8ede2;color:#48604f;display:flex;flex-wrap:wrap;font-size:12px;font-weight:750;gap:8px 18px;padding:13px 20px}.puzzle-trainer__topline span:last-child{font-variant-numeric:tabular-nums;margin-left:auto}.puzzle-trainer__layout{display:grid;gap:clamp(24px,5vw,64px);grid-template-columns:minmax(320px,1fr) minmax(340px,.9fr);padding:clamp(22px,5vw,52px)}.puzzle-board-wrap{min-width:0}.puzzle-board{aspect-ratio:1;background:#e7dfcd;border:8px solid #ecede5;border-radius:17px;box-shadow:0 13px 35px #203d2e1e;display:grid;grid-template-columns:repeat(8,1fr);overflow:hidden;width:min(100%,610px)}.puzzle-square{background:#ede5d4;display:grid;place-items:center;position:relative}.puzzle-square.is-dark{background:#78947e}.puzzle-square .chess-piece-image{height:84%;position:relative;width:84%;z-index:1}.puzzle-square small{bottom:2px;color:#35554390;font-size:clamp(7px,1vw,10px);font-weight:750;position:absolute;right:3px}.puzzle-square.is-dark small{color:#f5f4dfb5}.puzzle-board__turn{color:var(--practice-muted);font-size:13px;margin:12px 0 0;text-align:center}.puzzle-trainer__task h2{font-size:clamp(30px,4vw,48px);letter-spacing:-.045em;line-height:1.04;margin:0 0 13px}.puzzle-trainer__task>p:not(.practice-eyebrow,.puzzle-hint,.puzzle-branch){color:#4d6056;font-size:16px;line-height:1.58}.puzzle-text-position{background:#faf9f3;border:1px solid #dce0d4;border-radius:13px;margin:20px 0}.puzzle-text-position summary{cursor:pointer;font-weight:750;padding:12px 14px}.puzzle-text-position p{color:#52645a;line-height:1.5;margin:0;padding:0 14px 10px}.puzzle-text-position code{border-top:1px solid #e2e4da;color:#3d5849;display:block;font-size:12px;overflow-wrap:anywhere;padding:10px 14px}.puzzle-choice-list{display:grid;gap:9px}.puzzle-choice-list button{align-items:center;background:#fff;border:1px solid #cfd7c9;border-radius:13px;color:var(--practice-ink);cursor:pointer;display:flex;font:inherit;gap:12px;justify-content:space-between;min-height:54px;padding:11px 14px;text-align:left;width:100%}.puzzle-choice-list button:focus-visible,.puzzle-choice-list button:hover:not(:disabled){background:#f0f4e9;border-color:#739574}.puzzle-choice-list button:disabled{cursor:default;opacity:.72}.puzzle-choice-list span{font-weight:750}.puzzle-choice-list small{color:#708076;font-size:10px}.puzzle-feedback{background:#f5e9e0;border-left:4px solid #a96847;border-radius:11px;color:#704a36;margin-top:15px;padding:14px 16px}.puzzle-feedback.is-success{background:#e8f0e3;border-color:#4f8058;color:#315d3c}.puzzle-feedback p{line-height:1.52;margin:6px 0 0}.puzzle-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}.puzzle-actions button{background:#f5f6ef;border:1px solid #c8d1c3;border-radius:9px;color:#315b41;cursor:pointer;font:inherit;font-size:12px;font-weight:700;padding:8px 11px}.puzzle-branch,.puzzle-hint{background:#eef1df;border-radius:10px;color:#4d614f;font-size:13px;line-height:1.55;margin:12px 0 0;padding:12px 14px}.puzzle-trainer__task>.practice-primary{margin-top:17px;width:100%}.puzzle-trainer :is(button,summary,a):focus-visible{outline:3px solid #8dae7e;outline-offset:3px}.glossary-tools{-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:#f8f6efeb;border:1px solid var(--practice-line);border-radius:18px;padding:15px;position:sticky;top:var(--site-header-height,76px);z-index:4}.glossary-search{display:grid;gap:7px}.glossary-search span{font-size:12px;font-weight:750}.glossary-search input{background:#fff;border:1px solid #bdcabc;border-radius:12px;color:var(--practice-ink);font:inherit;min-height:48px;padding:10px 14px;width:100%}.glossary-count{color:var(--practice-muted);font-size:12px;margin:9px 0 0}.glossary-list{display:grid;gap:14px;grid-template-columns:repeat(2,minmax(0,1fr));padding-block:25px 80px}.glossary-entry{background:var(--practice-paper);border:1px solid var(--practice-line);border-radius:19px;padding:23px;scroll-margin-top:160px}.glossary-entry>span{color:#527957;font-size:10px;font-weight:800;letter-spacing:.09em;text-transform:uppercase}.glossary-entry h2{font-size:25px;letter-spacing:-.03em;margin:8px 0 10px}.glossary-entry p{color:#4e6157;line-height:1.55;margin:0 0 10px}.glossary-entry p+p{border-top:1px solid #e5e6dd;font-size:14px;padding-top:10px}.glossary-entry a{color:#285d40;font-weight:750;text-underline-offset:3px}.glossary-empty{border:1px dashed #aebdab;border-radius:18px;grid-column:1/-1;padding:40px;text-align:center}.print-controls{align-items:center;background:#e8eee2;border-radius:17px;display:flex;gap:20px;justify-content:space-between;margin-block:0 26px;padding:18px 20px}.print-controls p{color:#53675a;line-height:1.5;margin:0}.print-sheet{background:#fff;border:1px solid #cfd5ca;border-radius:20px;margin-bottom:28px;padding:30px;-moz-column-break-inside:avoid;break-inside:avoid}.print-sheet__header{border-bottom:2px solid #263e34;display:flex;gap:20px;justify-content:space-between;margin-bottom:22px;padding-bottom:12px}.print-sheet__header h2{font-size:28px;margin:0}.print-sheet__header span{font-size:12px}.print-board-frame{display:grid;gap:3px;grid-template-columns:24px minmax(0,1fr);grid-template-rows:minmax(0,1fr) 25px;margin-inline:auto;width:min(100%,660px)}.print-board{aspect-ratio:1;border:2px solid #1f332b;display:grid;grid-template-columns:repeat(8,1fr)}.print-board span{background:#fff;color:#172c24;display:grid;font-size:10px;place-items:center}.print-board span.is-dark{background:#aeb9ad}.print-board-files,.print-board-ranks{display:grid;font-size:12px;font-weight:750;text-align:center}.print-board-ranks{grid-template-rows:repeat(8,1fr)}.print-board-files{grid-column:2;grid-template-columns:repeat(8,1fr)}.print-board-files span,.print-board-ranks span{align-self:center}.piece-memory-grid{display:grid;gap:13px;grid-template-columns:repeat(3,1fr)}.piece-memory-card{align-items:center;border:1px solid #bbc3b8;border-radius:12px;display:grid;gap:13px;grid-template-columns:55px 1fr;padding:15px}.piece-memory-card b{font-size:43px;line-height:1}.piece-memory-card strong{display:block}.piece-memory-card p{font-size:13px;line-height:1.4;margin:4px 0 0}.mini-game-grid{display:grid;gap:14px;grid-template-columns:repeat(3,1fr)}.mini-game-card{border:2px dashed #748675;border-radius:14px;padding:18px}.mini-game-card h3{margin:0 0 8px}.mini-game-card p{font-size:13px;line-height:1.46;margin:7px 0}.mini-game-card ol{font-size:13px;line-height:1.5;padding-left:18px}.answer-key{page-break-before:always}.answer-key li{line-height:1.55;margin-bottom:14px}.print-answer-footer{align-items:center;border-top:1px solid #cfd5ca;display:grid;gap:18px;grid-template-columns:minmax(240px,.8fr) minmax(0,1.2fr);margin-top:24px;padding-top:18px}.print-practice-qr{align-items:center;display:grid;gap:14px;grid-template-columns:112px minmax(0,1fr)}.print-practice-qr img{background:#fff;display:block;height:112px;-o-object-fit:contain;object-fit:contain;width:112px}.print-practice-qr p,.print-usage{font-size:12px;line-height:1.5;margin:0}.print-practice-qr a{color:#285d40;font-weight:750;text-underline-offset:3px}.print-usage{background:#e9eee3;border-radius:12px;padding:14px}.print-meta{display:grid;gap:12px;grid-template-columns:repeat(3,1fr);margin-block:28px 70px}.print-meta div{background:#e9eee3;border-radius:15px;padding:17px}.print-meta strong{display:block;margin-bottom:5px}.print-meta span{color:#586960;font-size:13px;line-height:1.45}@media(max-width:860px){.practice-hero,.puzzle-trainer__layout{grid-template-columns:1fr}.practice-hero__aside{max-width:620px}.glossary-list,.mini-game-grid,.practice-card-grid,.practice-followup{grid-template-columns:1fr}.piece-memory-grid{grid-template-columns:repeat(2,1fr)}.print-answer-footer,.print-meta{grid-template-columns:1fr}.puzzle-board{margin-inline:auto}}@media(max-width:560px){.practice-page .page-width{width:min(100% - 24px,1180px)}.practice-hero{padding-top:34px}.practice-hero h1{font-size:clamp(38px,13vw,58px)}.practice-section__heading{display:block}.practice-section__heading>p{margin-top:14px}.puzzle-trainer{border-radius:20px}.puzzle-trainer__layout{padding:14px}.puzzle-board{border-radius:11px;border-width:5px}.puzzle-choice-list button{align-items:flex-start;flex-direction:column}.piece-memory-grid{grid-template-columns:1fr}.print-practice-qr{grid-template-columns:92px minmax(0,1fr)}.print-practice-qr img{height:92px;width:92px}.print-sheet{padding:16px}.print-sheet__header{display:block}.print-sheet__header span{display:block;margin-top:7px}}@media print{@page{size:A4 portrait;margin:12mm}.no-print,.practice-hero,.print-controls,.print-meta,.site-footer,.site-header{display:none!important}.practice-page,body,html{background:#fff!important;color:#000!important}.practice-page .page-width{margin:0;max-width:none;width:100%}.print-sheet{border:0;border-radius:0;box-shadow:none;margin:0;padding:0;page-break-after:always}.print-sheet:last-child{page-break-after:auto}.print-board,.print-board span.is-dark{print-color-adjust:exact;-webkit-print-color-adjust:exact}.print-board span.is-dark{background:#aaa!important}.mini-game-card,.piece-memory-card,.print-answer-footer{-moz-column-break-inside:avoid;break-inside:avoid}.print-practice-qr img{print-color-adjust:exact;-webkit-print-color-adjust:exact}.print-usage{background:#fff!important;border:1px solid #bbb}a{color:#000!important;text-decoration:none!important}}