:root{--ink:#152c40;--muted:#4e6475;--paper:#f9fcff;--line:#ad421e;--edge:#718b9d;--teal:#176572;--soft:#e2eff2;font-family:"Avenir Next","Segoe UI",Arial,sans-serif;color:var(--ink);background:#eaf0f5;font-synthesis:none;line-height:1.45;color-scheme:light}
*{box-sizing:border-box}body{margin:0}a{color:inherit;text-underline-offset:4px}button,select{font:inherit;color:inherit}button,select{min-height:44px}button{border:1px solid #8d9da9;background:transparent;padding:9px 13px;cursor:pointer;border-radius:5px;touch-action:manipulation}button:hover:not(:disabled){background:#d5e7ec}button:disabled{opacity:.46;cursor:default}button:focus-visible,select:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #a73c16;outline-offset:3px}.skip{position:fixed;left:12px;top:-80px;z-index:20;background:#fff;padding:12px}.skip:focus{top:12px}.site-header{max-width:1060px;margin:auto;padding:22px 28px 10px;display:flex;align-items:center;justify-content:space-between;gap:12px}.site-header>a{display:inline-flex;align-items:center;min-height:44px}.site-header>a:not(.brand){font-size:.9rem}.brand{font-family:Georgia,"Times New Roman",serif;font-size:1.55rem;letter-spacing:-.055em;text-decoration:none;font-weight:700}.brand svg{width:34px;height:34px;margin-right:9px;fill:none;stroke:var(--teal);stroke-width:2.6;stroke-linejoin:round}.brand circle{fill:var(--line);stroke:none}main{max-width:1004px;margin:auto}.heading{padding:10px 0 22px;display:flex;align-items:baseline;gap:24px}.heading h1{font-family:Georgia,"Times New Roman",serif;font-size:clamp(1.85rem,4vw,3rem);font-weight:500;letter-spacing:-.04em;line-height:1.1;margin:0}.heading p{margin:0;font-size:.96rem;color:var(--muted)}.game{display:grid;grid-template-columns:minmax(0,1fr) 264px;border-top:2px solid var(--ink);border-bottom:1px solid #a5b5c3}.puzzle-area{padding:20px 28px 20px 0}.puzzle-toolbar,.board-top{display:flex;align-items:center;justify-content:space-between;gap:14px}.modes{display:flex;gap:3px}.modes button{border:0;border-radius:0;padding:7px 13px}.modes button[aria-pressed=true]{border-bottom:3px solid var(--ink);font-weight:700}.size-label{display:flex;align-items:center;gap:8px;font-size:.85rem;font-weight:600}select{border:1px solid #8b9eac;border-radius:3px;background:transparent;padding:5px 9px}.board-top{font-size:.78rem;color:var(--muted);margin:14px 0 12px;font-variant-numeric:tabular-nums}.board-paper{background:var(--paper);padding:25px;border:1px solid #a6b6c4;box-shadow:6px 6px 0 #d4dfe7}.board-paper #board{position:relative;aspect-ratio:1;max-width:510px;margin:auto;outline:none}.edge{position:absolute;z-index:2;padding:0;min-height:0;border:0;border-radius:0;transform:translate(-50%,-50%);background:transparent;color:var(--line);touch-action:manipulation}.edge.horizontal{height:26px;width:calc(100% / var(--size) - 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@media(max-width:1060px){main,footer{margin-left:28px;margin-right:28px}.heading{gap:15px}.puzzle-area{padding-right:22px}}
@media(max-width:760px){.site-header{padding:10px 16px 4px}.brand{font-size:1.35rem}.brand svg{width:28px;margin-right:6px}main,footer{margin-left:16px;margin-right:16px}.heading{display:block;padding:8px 0 15px}.heading h1{font-size:1.95rem}.heading p{font-size:.87rem;margin-top:5px}.game{display:block}.puzzle-area{padding:9px 0 16px}.board-top{margin:10px 0;font-size:.75rem}.board-paper{padding:21px;box-shadow:4px 4px 0 #d4dfe7}.board-paper #board{max-width:410px}.edge-tools{padding:19px;display:grid;grid-template-columns:1fr 1fr;column-gap:18px}.edge-tools h2{grid-column:1;font-size:1.22rem}.selected-edge{grid-column:1;margin-bottom:10px;min-height:0}.mark-tools{grid-column:2;grid-row:1/3;align-self:start}.navigator{grid-column:1/-1;grid-row:3;margin:5px 0 0}.navigator button{width:48px;flex-basis:48px;height:46px}.tool-help{grid-column:1/-1;text-align:center;margin:12px 0;font-size:.77rem}.hint-box,.save-problem,.keyboard-help,#hint-diagnostic{grid-column:1/-1}.status{font-size:.9rem;margin-top:17px}.actions{gap:6px}.actions button{font-size:.83rem;padding:8px 10px}.clue{font-size:clamp(21px,5.5vw,29px)}footer{margin-top:13px}.rules{padding:10px 0 30px}.example{gap:16px}.example svg{max-width:43%}.example figcaption{font-size:.88rem}}
@media(prefers-reduced-motion:no-preference){button{transition:background-color .12s}.edge::before{transition:background-color .1s}}
@media(max-width:420px){.edge-tools{display:block}.mark-tools{margin-top:12px}.navigator{margin-top:14px}}