:root{--bg: #f7f6f3;--surface: #ffffff;--ink: #1b1b1f;--muted: #6b6b73;--line: #d9d8d3;--border: #1b1b1f;--accent: #0d7d73;--accent-soft: #d5f0ec;--danger: #d13b3b;--accent-ink: #ffffff;--solved: #30a46c;color-scheme:light}@media(prefers-color-scheme:dark){:root{--bg: #16161a;--surface: #1f1f24;--ink: #ededef;--muted: #a0a0a8;--line: #34343b;--border: #8b8b94;--accent: #3fc7b6;--accent-soft: #123b37;--danger: #ff6b6b;--accent-ink: #0d0d10;--solved: #3dd68c;color-scheme:dark}}*{box-sizing:border-box}a,button{touch-action:manipulation;-webkit-tap-highlight-color:transparent}html,body{margin:0}html{touch-action:manipulation}body{background:var(--bg);color:var(--ink);font:16px/1.5 Poppins,system-ui,-apple-system,Segoe UI,sans-serif;padding:env(safe-area-inset-top,0) 16px env(safe-area-inset-bottom,0)}a{color:var(--accent)}h1,h2{line-height:1.2;margin:0}h1{font-size:1.6rem;font-weight:600}.page{max-width:720px;margin:0 auto;padding-block:24px 48px}.page-head{margin-bottom:20px}.page-head h1{margin-top:4px}.lede{color:var(--muted);margin:6px 0 0}.account-line{margin:-6px 0 14px;font-size:.9rem;min-height:1.4em}.account-line a{font-weight:500}.brand{margin:0;color:var(--muted);font-size:.8rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase}.site-back{display:inline-block;margin-bottom:14px}.back{text-decoration:none;font-size:.9rem;font-weight:500}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink);font:inherit;font-weight:500;text-decoration:none;cursor:pointer}.btn:hover:not(:disabled){border-color:var(--muted)}.btn:disabled{opacity:.45;cursor:default}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:16px}.tab{padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);text-decoration:none;font-weight:500}.tab small{color:var(--muted);font-weight:400}.tab.active{background:var(--ink);border-color:var(--ink);color:var(--bg)}.tab.active small{color:inherit;opacity:.7}.progress-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px;color:var(--muted)}.tiles{display:grid;gap:8px;grid-template-columns:repeat(auto-fill,minmax(52px,1fr))}.tile{aspect-ratio:1;display:grid;place-items:center;border-radius:10px;background:var(--surface);border:1px solid var(--line);color:var(--ink);text-decoration:none;font-weight:500;font-variant-numeric:tabular-nums}.tile:hover{border-color:var(--accent)}.tile.solved{background:var(--solved);border-color:var(--solved);color:var(--accent-ink)}.play{max-width:560px;margin:0 auto;padding-block:12px 24px;min-height:calc(100dvh - env(safe-area-inset-top,0px) - env(safe-area-inset-bottom,0px));display:flex;flex-direction:column;gap:12px}.play-head{display:grid;grid-template-columns:1fr auto 1fr;align-items:center}.play-head h1{font-size:1.15rem;text-align:center}.timer{justify-self:end;font-variant-numeric:tabular-nums;color:var(--muted)}.board-wrap{position:relative;width:min(100%,calc(100dvh - 250px));min-width:260px;margin:auto auto 0}.br-board{display:block;width:100%;height:auto;aspect-ratio:1;background:var(--surface);border-radius:6px;border:1px solid var(--line);touch-action:none;user-select:none;-webkit-user-select:none;cursor:pointer;-webkit-touch-callout:none}.br-board .dot{stroke:var(--line);stroke-width:.09;stroke-linecap:round}.br-board .bridge{stroke:var(--ink);stroke-width:.08;stroke-linecap:round}.br-board .bridge.blocked{stroke:var(--danger, #d13b3b);stroke-width:.14}.br-board .preview{stroke:var(--accent);stroke-width:.08;stroke-dasharray:.15 .12;opacity:.8}.br-board .island circle{fill:var(--surface);stroke:var(--ink);stroke-width:.06}.br-board .island text{fill:var(--ink);font-size:.42px;font-weight:600;text-anchor:middle;pointer-events:none}.br-board .island.done circle{fill:var(--accent-soft);stroke:var(--accent)}.br-board .island.done text{fill:var(--accent)}.br-board .island.over circle{stroke:var(--danger, #d13b3b);stroke-width:.09}.br-board .island.over text{fill:var(--danger, #d13b3b)}.tip{margin:0;color:var(--muted);font-size:.8rem;text-align:center;max-width:34ch}.play-foot{display:flex;flex-direction:column;align-items:center;gap:10px;margin-bottom:auto}.status{color:var(--muted);font-size:.9rem;font-variant-numeric:tabular-nums}.actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.win{position:absolute;inset:0;display:grid;place-items:center;background:color-mix(in srgb,var(--bg) 55%,transparent);border-radius:6px;animation:fade .25s ease-out}.win-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:24px 28px;text-align:center;box-shadow:0 10px 30px #00000026}.win-card h2{font-size:1.5rem}.win-card p{color:var(--muted);margin:6px 0 16px}@keyframes fade{0%{opacity:0}}[hidden]{display:none!important}.btn.small{min-height:36px;padding:0 14px;font-size:.9rem}.howto-row{margin:12px 0 0}.help{justify-self:end;display:flex;align-items:center;gap:10px}.help-btn{width:30px;height:30px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--ink);font:inherit;font-weight:600;cursor:pointer;padding:0}.ht-overlay{position:fixed;inset:0;z-index:50;display:grid;place-items:center;padding:16px;background:#00000073;animation:ht-fade .2s ease-out}.ht-card{position:relative;width:min(100%,420px);max-height:calc(100dvh - 32px);overflow-y:auto;background:var(--surface);border-radius:18px;padding:22px 22px 18px;box-shadow:0 20px 50px #0000004d;text-align:center}.ht-close{position:absolute;top:8px;right:8px;width:40px;height:40px;border:0;border-radius:50%;background:transparent;color:var(--muted);font-size:1.6rem;line-height:1;cursor:pointer}.ht-art{aspect-ratio:4 / 3;display:grid;place-items:center;margin:6px 0 12px;background:var(--bg);border-radius:12px}.ht-art svg{width:100%;height:100%;display:block}.ht-card h2{font-size:1.25rem}.ht-text{color:var(--muted);margin:6px 0 14px;min-height:4.5em}.ht-dots{display:flex;justify-content:center;gap:2px;margin-bottom:14px}.ht-dot{width:22px;height:22px;border:0;padding:0;background:transparent;cursor:pointer;display:grid;place-items:center}.ht-dot:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--line)}.ht-dot[aria-current=step]:before{background:var(--accent);width:18px;border-radius:4px}.ht-nav{display:flex;gap:10px}.ht-nav .btn{flex:1}.ht-art .grid{stroke:var(--line);stroke-width:.4}.ht-art .frame{fill:none;stroke:var(--ink);stroke-width:.8}.ht-art .cell{fill:var(--surface)}.ht-art .num{fill:var(--ink);font-weight:600;text-anchor:middle;font-family:Poppins,system-ui,sans-serif}.ht-art .num.mut{fill:var(--muted);font-weight:500}.ht-art .num.acc{fill:var(--accent)}.ht-art .num.red{fill:var(--danger, #d13b3b)}.ht-art .num.light{fill:#fff}.ht-art .ink{fill:var(--ink)}.ht-art .acc{fill:var(--accent)}.ht-art .acc-line{fill:none;stroke:var(--accent);stroke-linecap:round;stroke-linejoin:round}.ht-art .red-line{fill:none;stroke:var(--danger, #d13b3b);stroke-linecap:round;stroke-linejoin:round}.ht-art .ink-line{fill:none;stroke:var(--ink);stroke-linecap:round;stroke-linejoin:round}.ht-art .mut-line{fill:none;stroke:var(--muted);stroke-linecap:round}.ht-art .red{fill:var(--danger, #d13b3b)}.ht-art .mutd{fill:var(--muted)}.ht-art .isl{fill:var(--surface);stroke:var(--ink);stroke-width:.7}.ht-art .isl.done{fill:color-mix(in srgb,var(--accent) 16%,var(--surface));stroke:var(--accent)}.ht-art .good-bg{fill:var(--solved)}.ht-art .bad-bg{fill:var(--danger, #d13b3b)}.ht-art .mark{fill:none;stroke:#fff;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round}.ht-art .soft{fill:color-mix(in srgb,var(--accent) 16%,var(--surface))}.ht-art .tap{fill:none;stroke:var(--ink);stroke-width:.8;opacity:0;animation:ht-tap .7s ease-out var(--d, 0s)}.ht-art .draw{stroke-dasharray:1;stroke-dashoffset:1;animation:ht-draw .9s ease-in-out var(--d, 0s) forwards}.ht-art .pop{opacity:0;transform-box:fill-box;transform-origin:center;animation:ht-pop .35s ease-out var(--d, 0s) forwards}.ht-art .appear{opacity:0;animation:fade-in .4s ease-out var(--d, 0s) forwards}.ht-art .vanish{animation:fade-out .3s ease-in var(--d, 0s) forwards}@keyframes ht-fade{0%{opacity:0}}@keyframes ht-draw{to{stroke-dashoffset:0}}@keyframes ht-pop{0%{opacity:0;transform:scale(.3)}70%{opacity:1;transform:scale(1.12)}to{opacity:1;transform:scale(1)}}@keyframes fade-in{to{opacity:1}}@keyframes fade-out{to{opacity:0}}@keyframes ht-tap{0%{opacity:.8;transform:scale(.4)}to{opacity:0;transform:scale(1.6)}}.ht-art .tap{transform-box:fill-box;transform-origin:center}@media(prefers-reduced-motion:reduce){.ht-art .draw{animation:none;stroke-dashoffset:0}.ht-art .pop,.ht-art .appear{animation:none;opacity:1}.ht-art .vanish{animation:none;opacity:0}.ht-art .tap{display:none}}