/* The explanatory section is separate from the playing surface. All rules stay scoped. */
.sudoku-guide{width:100%;margin:0;background:#fff9e9;border-top:1px solid #e9dba9;color:var(--ink,#25343a);font-size:14px;line-height:1.7;text-align:left}
.sudoku-guide .sg-content{width:min(100% - 40px,780px);margin:0 auto;padding:48px 0 54px}
.sudoku-guide .sg-heading{display:flex;align-items:center;gap:16px;margin-bottom:16px}
.sudoku-guide .sg-heading-icon{display:grid;place-items:center;width:52px;height:52px;flex:none;background:#f8dd70;border-radius:14px;color:#a75624}
.sudoku-guide .sg-heading-icon svg{width:30px;height:30px;fill:none;stroke:currentColor;stroke-width:1.5}.sudoku-guide .sg-icon-fill{fill:#d87330;stroke:none}
.sudoku-guide h2{margin:0;font-size:27px;line-height:1.25;letter-spacing:-.6px}.sudoku-guide .sg-heading p{margin:5px 0 0;color:#82765d;font-size:13px}
.sudoku-guide h3{margin:0;font-size:18px;line-height:1.4}.sudoku-guide p{margin:10px 0;color:#666b60}.sudoku-guide .sg-intro{max-width:620px;margin:0 0 26px}
.sudoku-guide .sg-rules{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;padding:0;margin:0 0 32px;list-style:none}
.sudoku-guide .sg-rules li{padding:12px 12px 8px;border-right:1px solid #e7dcb7;text-align:center}.sudoku-guide .sg-rules li:last-child{border-right:0}
.sudoku-guide .sg-rules h3{font-size:14px;margin:14px 0 3px;font-weight:650}.sudoku-guide .sg-rules p{font-size:12px;margin:0;color:#7c7563}
.sudoku-guide .sg-grid-example{display:block;width:108px;height:108px;max-width:100%;margin:auto;fill:none;stroke:none}
.sudoku-guide .sg-example-paper{fill:#fffef9;stroke:#c4b888;stroke-width:1}.sudoku-guide .sg-example-highlight{fill:#f8d861}
.sudoku-guide .sg-example-grid{stroke:#ddd4b9;stroke-width:.6;stroke-linecap:butt}.sudoku-guide .sg-example-boxes{stroke:#baab78;stroke-width:1.3;stroke-linecap:butt}
.sudoku-guide .sg-example-digits{fill:#7e4823;stroke:none;text-anchor:middle;dominant-baseline:middle;font:650 10px var(--font,system-ui)}
.sudoku-guide .sg-lesson{padding:26px;border:1px solid #e8d9a7;border-radius:14px;background:#fffdf5}
.sudoku-guide .sg-lesson h3{display:flex;align-items:center;gap:9px}.sudoku-guide .sg-accent-icon{width:22px;height:22px;fill:#e58a38;stroke:none;flex:none}
.sudoku-guide .sg-lesson>p{font-size:13px;max-width:640px;margin:10px 0 20px}
.sudoku-guide .sg-exercise-body{display:grid;grid-template-columns:1fr 1.15fr;gap:26px;align-items:center}
.sudoku-guide .sg-evidence{display:flex;align-items:center;gap:16px;padding:18px 14px;background:#fbf3da;border-radius:9px;min-height:134px}
.sudoku-guide .sg-target{width:48px;height:48px;display:grid;place-items:center;flex:none;background:#f9db66;border:2px solid #dc9c42;border-radius:6px;font-size:28px;font-weight:650;color:#8e4e27}
.sudoku-guide dl{margin:0}.sudoku-guide .sg-evidence dl{flex:1;display:grid;gap:8px}.sudoku-guide .sg-evidence dl div{display:flex;gap:10px;align-items:center;justify-content:space-between}
.sudoku-guide .sg-evidence dt{font-size:11px;color:#756c54}.sudoku-guide .sg-evidence dd{display:flex;gap:5px;margin:0;min-width:76px}
.sudoku-guide .sg-evidence dd span{display:grid;place-items:center;width:22px;height:24px;border:1px solid #e7d8ac;border-radius:4px;background:#fffdf3;font-size:13px;font-weight:650;line-height:1}
.sudoku-guide .sg-choice-label{font-size:12px;margin:0 0 9px}.sudoku-guide .sg-choices{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:4px}
.sudoku-guide .sg-choices button{min-width:0;min-height:44px;padding:0;border:1px solid #e0d5b0;border-radius:5px;background:#fffcf0;color:#654d2c;font-size:19px;font-weight:600}
.sudoku-guide .sg-choices button[aria-pressed=true]{border-color:#bc5c2d;background:#fae1c4;box-shadow:inset 0 0 0 1px #bc5c2d}
.sudoku-guide .sg-choices button[data-result=correct]{border-color:#ad761e;background:#f8dc76;box-shadow:inset 0 0 0 1px #ad761e}
.sudoku-guide .sg-feedback{font-size:12px;min-height:3.4em;margin:9px 0 0}.sudoku-guide .sg-feedback[data-result=correct]{color:#74511c}.sudoku-guide .sg-feedback[data-result=incorrect]{color:#a64824}
.sudoku-guide .sg-disclosures{margin-top:24px}.sudoku-guide details{margin:0;border-bottom:1px solid #e7dbb8}
.sudoku-guide summary{display:flex;align-items:center;gap:12px;cursor:pointer;padding:18px 0;font-size:15px;font-weight:650;line-height:1.5;min-height:62px;list-style:none}
.sudoku-guide summary::-webkit-details-marker{display:none}.sudoku-guide summary::marker{content:""}
.sudoku-guide summary::after{content:"+";margin-left:auto;flex:none;color:#a77128;font-size:24px;font-weight:400;line-height:1}
.sudoku-guide details[open]>summary::after{content:"−"}.sudoku-guide summary:focus-visible{outline:3px solid #b4471f;outline-offset:3px;border-radius:3px}
.sudoku-guide .sg-disclosure-icon{width:21px;height:21px;flex:none;fill:none;stroke:#d38430;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.sudoku-guide .sg-detail-body{padding:0 33px 20px}.sudoku-guide .sg-detail-body>p{font-size:13px;margin:0 0 12px}.sudoku-guide .sg-detail-body>p:last-child{margin-bottom:0}
.sudoku-guide .sg-levels,.sudoku-guide .sg-controls{display:grid;gap:16px;margin:14px 0 0}
.sudoku-guide .sg-levels>div,.sudoku-guide .sg-controls>div{display:grid;grid-template-columns:104px minmax(0,1fr);gap:16px}
.sudoku-guide .sg-levels dt,.sudoku-guide .sg-controls dt{font-weight:650;font-size:13px;color:#84632b}
.sudoku-guide .sg-levels dd,.sudoku-guide .sg-controls dd{margin:0;color:#666b60;font-size:13px}
.sudoku-guide .sg-hidden-example{display:grid;grid-template-columns:minmax(0,250px) minmax(0,1fr);align-items:start;gap:26px;margin:20px 0}
.sudoku-guide .sg-hidden-example caption{text-align:left;color:#756c54;font-size:12px;line-height:1.5;padding:0 0 10px}
.sudoku-guide .sg-hidden-board{width:100%;table-layout:fixed;border-collapse:collapse;background:#fffef9;font-size:16px;font-variant-numeric:tabular-nums;text-align:center;border:2px solid #ac9862}
.sudoku-guide .sg-hidden-board td{padding:0;height:27px;border:1px solid #e1d8bb;font-weight:500}
.sudoku-guide .sg-hidden-board tr:nth-child(3n) td{border-bottom:2px solid #ac9862}.sudoku-guide .sg-hidden-board td:nth-child(3n){border-right:2px solid #ac9862}
.sudoku-guide .sg-hidden-row td{background:#faedb9}.sudoku-guide .sg-hidden-board .sg-hidden-target{background:#f5ce33;box-shadow:inset 0 0 0 2px #bc5c2d}
.sudoku-guide .sg-hidden-board .sg-hidden-reference{color:#a74620;font-weight:800}
.sudoku-guide .sg-candidate-table{width:100%;border-collapse:collapse;font-size:12px;text-align:left}
.sudoku-guide .sg-candidate-table th{font-weight:600}.sudoku-guide .sg-candidate-table th,.sudoku-guide .sg-candidate-table td{border-bottom:1px solid #e7dbb8;padding:10px 0;vertical-align:middle}
.sudoku-guide .sg-candidate-table th:first-child{padding-right:8px}.sudoku-guide .sg-candidate-table td{white-space:nowrap}
.sudoku-guide .sg-candidate{display:inline-grid;place-items:center;width:23px;height:26px;margin-right:3px;border-radius:4px;background:#f2ecd8;color:#5e5f4e}
.sudoku-guide .sg-candidate-key{background:#f5ce33;color:#25343a;font-weight:750}
.sudoku-guide .sg-worked-steps{padding-left:20px;margin:16px 0;font-size:13px;color:#666b60}.sudoku-guide .sg-worked-steps li{padding-left:3px;margin:9px 0}
@media(max-width:600px){.sudoku-guide .sg-hidden-example{grid-template-columns:1fr;gap:22px}.sudoku-guide .sg-hidden-board{max-width:250px;margin:0 auto}.sudoku-guide .sg-candidate-table{max-width:340px;margin:0 auto;font-size:13px}.sudoku-guide .sg-candidate-table th,.sudoku-guide .sg-candidate-table td{padding-top:9px;padding-bottom:9px}}
@media(hover:hover){.sudoku-guide .sg-choices button:hover{background:#f8eab5}.sudoku-guide summary:hover{color:#9e6025}}
@media(max-width:700px){.sudoku-guide .sg-exercise-body{grid-template-columns:1fr;gap:18px}.sudoku-guide .sg-evidence{max-width:360px;width:100%;margin:0 auto;padding:18px 22px;gap:24px}.sudoku-guide .sg-choices button{font-size:20px}.sudoku-guide .sg-evidence dt{font-size:12px}.sudoku-guide .sg-evidence dd{gap:7px;min-width:92px}.sudoku-guide .sg-evidence dd span{width:26px;height:27px}}
@media(max-width:520px){.sudoku-guide .sg-content{width:calc(100% - 32px);padding:32px 0 38px}.sudoku-guide{font-size:13px}.sudoku-guide h2{font-size:23px}.sudoku-guide .sg-heading{gap:12px}.sudoku-guide .sg-heading-icon{width:45px;height:45px;border-radius:12px}.sudoku-guide .sg-heading-icon svg{width:27px;height:27px}.sudoku-guide .sg-intro{margin-bottom:20px}.sudoku-guide .sg-rules{grid-template-columns:1fr;gap:0;margin-bottom:24px}.sudoku-guide .sg-rules li{display:grid;grid-template-columns:108px minmax(0,1fr);grid-template-rows:1fr 1fr;column-gap:22px;padding:14px 8px;border-right:0;border-bottom:1px solid #e7dcb7;text-align:left}.sudoku-guide .sg-rules li:last-child{border-bottom:0}.sudoku-guide .sg-grid-example{grid-row:1 / 3;width:108px;height:108px}.sudoku-guide .sg-rules h3{font-size:15px;margin:0 0 4px;align-self:end}.sudoku-guide .sg-rules p{font-size:13px;align-self:start}.sudoku-guide .sg-lesson{padding:18px 14px;border-radius:11px}.sudoku-guide .sg-lesson h3{font-size:17px}.sudoku-guide .sg-evidence{padding:15px 18px;gap:20px}.sudoku-guide .sg-feedback{min-height:5.1em}.sudoku-guide summary{font-size:14px;font-weight:650;gap:10px}.sudoku-guide .sg-detail-body{padding:0 0 20px}.sudoku-guide .sg-levels>div,.sudoku-guide .sg-controls>div{grid-template-columns:78px minmax(0,1fr);gap:12px}.sudoku-guide .sg-levels dt,.sudoku-guide .sg-controls dt{font-size:12px}}
@media(max-width:350px){.sudoku-guide .sg-rules li{column-gap:16px;padding:12px 0}.sudoku-guide .sg-rules h3{font-size:14px}.sudoku-guide .sg-evidence{padding:12px;gap:14px}}

.sudoku-guide .sg-site-links{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:28px;font-size:12px;color:#756c54}.sudoku-guide .sg-site-links a{text-underline-offset:3px}