:root{--color-page:#e9efe8;--color-surface-rgb:247 250 245;--color-surface:rgb(var(--color-surface-rgb));--color-ink-rgb:29 42 34;--color-ink:rgb(var(--color-ink-rgb));--color-ink-soft:#5f7166;--color-rule:#c9d4cb;--color-moss:#3d6b50;--color-moss-ink:#f2f7f1;--color-loop:#3f9e4d;--color-danger:#c43d2f;--color-hint:#2f6fd1;--color-guide:#f2c94c;--color-focus:#2f6fd1;--text-small:14px;--text-caption:12px;color:var(--color-ink);background:var(--color-page);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light only;font-family:ui-rounded,Hiragino Maru Gothic ProN,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Noto Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif}*{box-sizing:border-box}body{min-width:320px;margin:0;line-height:1.6}button,input{font:inherit;color:inherit}button{border:1px solid var(--color-rule);background:var(--color-surface);cursor:pointer;border-radius:10px;justify-content:center;align-items:center;gap:6px;min-height:44px;padding:8px 14px;display:inline-flex}button:disabled{cursor:default;opacity:.4}button.primary{background:var(--color-moss);border-color:var(--color-moss);color:var(--color-moss-ink);font-weight:700}:focus-visible{outline:3px solid var(--color-focus);outline-offset:2px}.ui-icon{flex-shrink:0;width:20px;height:20px}.ui-icon :-webkit-any(path,circle,rect,line,polyline,polygon,ellipse){vector-effect:non-scaling-stroke}.ui-icon :-moz-any(path,circle,rect,line,polyline,polygon,ellipse){vector-effect:non-scaling-stroke}.ui-icon :is(path,circle,rect,line,polyline,polygon,ellipse){vector-effect:non-scaling-stroke}.icon-button{flex-shrink:0;width:44px;padding:8px}.icon-button .ui-icon{width:24px;height:24px}.app-shell{width:min(100%,560px);height:100vh;height:100dvh;padding:max(8px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) max(12px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));grid-template-rows:auto minmax(0,1fr);grid-template-columns:minmax(0,1fr);grid-auto-rows:auto;gap:8px;margin:0 auto;display:grid}.top-bar{justify-content:space-between;align-items:center;gap:8px;min-height:44px;display:flex}.top-bar .icon-button{background:0 0;border-color:#0000}.status{min-width:0;font-size:var(--text-small);color:var(--color-ink-soft);align-items:center;gap:10px;display:flex}.chip{color:var(--color-ink);align-items:center;gap:4px;font-weight:700;display:inline-flex}.status-text.error,.error{color:var(--color-danger)}.board-area{place-items:center;min-height:0;display:grid;container-type:size}.board-frame{aspect-ratio:1;width:100%;position:relative}@supports (width:1cqmin){.board-frame{width:100cqmin}}.board-frame.busy .board-svg{opacity:.45}.board-svg{touch-action:none;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;cursor:pointer;width:100%;height:100%;display:block}.board-surface{fill:var(--color-surface)}.loop-inside rect{fill:var(--color-moss);opacity:.16}.clues text{text-anchor:middle;dominant-baseline:central;fill:var(--color-ink);pointer-events:none;font-size:.56px;font-weight:800}.clues text.satisfied{opacity:.3}.clues text.conflict{fill:var(--color-danger)}.lines line{stroke:var(--color-loop);stroke-width:.13px;stroke-linecap:round}.lines line.conflict{stroke:var(--color-danger);stroke-dasharray:.18 .12;stroke-linecap:butt}.cross{fill:none;stroke:var(--color-ink-soft);stroke-width:.045px;stroke-linecap:round}.cross.auto{stroke-width:.03px;opacity:.45}.guide rect,.guide circle{fill:var(--color-guide);opacity:.4}.hint-area rect{fill:var(--color-hint);opacity:.14}.hint-edge{stroke:var(--color-hint);stroke-width:.22px;stroke-linecap:round;opacity:.3}.hint-line{stroke:var(--color-hint);stroke-width:.11px;stroke-dasharray:.12 .1}.hint-cross{fill:none;stroke:var(--color-hint);stroke-width:.06px;stroke-linecap:round}.hint-cell,.hint-vertex{fill:none;stroke:var(--color-hint);stroke-width:.06px}.hint>*{animation:1.1s ease-in-out infinite alternate hint-pulse}@keyframes hint-pulse{to{opacity:.45}}.vertices circle{fill:var(--color-ink);opacity:.65}.vertices circle.conflict{fill:none;stroke:var(--color-danger);stroke-width:.05px;opacity:1}.snake-body{fill:none;stroke:var(--color-loop);stroke-linecap:round;stroke-linejoin:round}.snake-head ellipse{fill:var(--color-loop)}.snake-head .eye{fill:#fff}.snake-head .pupil{fill:var(--color-ink)}.zoom-overlay{background:rgb(var(--color-surface-rgb) / 55%);z-index:2;border-radius:14px;place-items:center;display:grid;position:absolute;top:0;bottom:0;left:0;right:0}.zoom-box{aspect-ratio:1;background:var(--color-surface);border:1px solid var(--color-rule);border-radius:14px;width:94%;position:relative;overflow:hidden;box-shadow:0 16px 40px -18px #00000080}.zoom-box .board-svg{cursor:grab}.zoom-close{background:rgb(var(--color-surface-rgb) / 88%);position:absolute;top:6px;right:6px}.clear-overlay{z-index:3;place-items:center;display:grid;position:absolute;top:0;bottom:0;left:0;right:0}.clear-card{text-align:center;background:var(--color-surface);border:1px solid var(--color-rule);border-radius:14px;gap:12px;padding:18px 22px;display:grid;box-shadow:0 12px 30px -16px #0006}.clear-icon{justify-self:center;width:56px;height:56px}.clear-card h2{color:var(--color-moss);margin:0;font-size:1.3rem}.clear-actions{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.difficulty-select{border:1px solid var(--color-rule);background:var(--color-surface);min-height:44px;font:inherit;color:inherit;border-radius:10px;padding:8px 10px}.chip-button{background:0 0;border:0;min-height:44px;padding:0 8px 0 0}.start-actions{flex-wrap:wrap;margin-top:12px}.start-actions button{align-items:center;gap:6px;display:inline-flex}.controls{justify-content:space-between;align-items:center;gap:8px;display:flex}.tool-switch{border:1px solid var(--color-rule);border-radius:12px;display:inline-flex;overflow:hidden}.tool-switch button{border:0;border-radius:0;min-width:52px;padding:8px 7px;font-weight:700}.tool-switch button[aria-pressed=true]{background:var(--color-ink);color:var(--color-page)}.actions{flex-wrap:wrap;justify-content:flex-end;gap:3px;display:flex}.actions .icon-button{width:40px}.controls{flex-wrap:wrap}dialog{color:inherit;background:0 0;border:0;width:min(100% - 24px,440px);max-height:calc(100dvh - 24px);padding:0}dialog::backdrop{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);background:#00000059}.dialog-card{background:var(--color-surface);border:1px solid var(--color-rule);border-radius:16px;gap:12px;padding:14px 16px 18px;display:grid}.dialog-card h2{margin:0;font-size:1.15rem}.dialog-card h3{font-size:var(--text-small);color:var(--color-ink-soft);margin:4px 0 0}.dialog-header{align-items:center;gap:8px;display:flex}.dialog-header h2{flex:1}.dialog-header .icon-button,.text-button{background:0 0;border-color:#0000}.text-button{padding:6px 8px}.dialog-actions{justify-content:flex-end;gap:8px;display:flex}.menu-list,.choice-list{gap:8px;display:grid}.menu-list button,.choice-list button{justify-content:flex-start;padding:10px 14px;font-weight:700}.choice-list button[aria-current=true]{border-color:var(--color-moss)}.menu-page{gap:8px;display:grid}.note{min-height:1.6em;font-size:var(--text-small);color:var(--color-ink-soft);margin:0}.seed-row,.seed-form{align-items:center;gap:8px;display:flex}.seed-code{overflow-wrap:anywhere;min-width:0;font-family:ui-monospace,monospace;font-size:var(--text-small);flex:1}.seed-form input{border:1px solid var(--color-rule);background:var(--color-surface);border-radius:10px;flex:1;min-width:0;min-height:44px;padding:8px 10px;font-family:ui-monospace,monospace}.setting-group{border:0;gap:4px;margin:0;padding:0;display:grid}.setting-group legend{margin-bottom:4px;font-weight:700}.radio,.toggle{cursor:pointer;align-items:flex-start;gap:10px;padding:6px 0;display:flex}.radio input,.toggle input{width:18px;height:18px;accent-color:var(--color-moss);margin-top:5px}.radio small,.toggle small{font-size:var(--text-caption);color:var(--color-ink-soft);display:block}.toggle{font-weight:700}.help ul{font-size:var(--text-small);margin:0;padding-left:1.2em;line-height:1.8}.hint-button{color:var(--color-hint)}.hint-panel{background:var(--color-surface);border:1px solid var(--color-hint);border-radius:14px;gap:8px;padding:10px 12px 12px;display:grid}.hint-panel header{justify-content:space-between;align-items:center;display:flex}.hint-panel h2{color:var(--color-hint);align-items:center;gap:6px;margin:0;font-size:1rem;display:inline-flex}.hint-panel h2 small{font-size:var(--text-caption);color:var(--color-ink-soft);font-weight:400}.hint-panel header .icon-button{background:0 0;border-color:#0000}.hint-panel p{font-size:var(--text-small);margin:0}.top-actions{align-items:center;gap:2px;display:flex}.timer{font-variant-numeric:tabular-nums;margin-right:4px}.ready-overlay{z-index:20;background:rgb(var(--color-ink-rgb) / 88%);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);place-items:center;padding:24px;display:grid;position:fixed;top:0;bottom:0;left:0;right:0}.ready-card{background:var(--color-surface);border-radius:20px;justify-items:center;gap:18px;width:min(100%,300px);padding:28px 20px;display:grid}.ready-card h2{letter-spacing:.04em;margin:0;font-size:max(32px,min(9vw,44px))}.ready-card .note{margin:-8px 0 0}.ready-actions{gap:12px;min-width:160px;display:grid}.ready-actions button{border-radius:999px;justify-content:center;align-items:center;gap:6px;display:inline-flex}.stats{grid-template-columns:repeat(auto-fit,minmax(72px,1fr));gap:8px;margin:0;display:grid}.stats dt{font-size:var(--text-caption);color:var(--color-ink-soft)}.stats dd{font-variant-numeric:tabular-nums;margin:0;font-weight:700}.stats .wide{grid-column:1/-1}.stats small{color:var(--color-ink-soft);margin-left:6px;font-weight:400}.tabs{grid-template-columns:repeat(3,1fr);gap:4px;margin-bottom:12px;display:grid}.tabs button[aria-selected=true]{background:var(--color-moss);border-color:var(--color-moss);color:var(--color-moss-ink);font-weight:700}.recent{font-size:var(--text-small);font-variant-numeric:tabular-nums;gap:2px;margin:0;padding:0;list-style:none;display:grid}.recent li{border-bottom:1px solid var(--color-rule);flex-wrap:wrap;align-items:baseline;gap:4px 10px;padding:6px 0;display:flex}.recent .when,.recent .hints,.recent .unfinished{color:var(--color-ink-soft)}.recent .when{min-width:7.5em}.leaderboard{font-size:var(--text-small);font-variant-numeric:tabular-nums;text-align:left;gap:2px;margin:0;padding:0;list-style:none;display:grid}.leaderboard li{border-bottom:1px solid var(--color-rule);grid-template-columns:2em 1fr auto;align-items:baseline;gap:0 8px;padding:6px 4px;display:grid}.leaderboard li.self{background:rgb(var(--color-surface-rgb) / 60%);font-weight:700}.leaderboard .rank{text-align:right}.leaderboard .name{overflow-wrap:anywhere}.leaderboard .detail{color:var(--color-ink-soft);grid-column:2/-1}.assist-mark{border:1px solid var(--color-rule);border-radius:999px;margin-left:4px;padding:0 6px}.clear-ranking{gap:4px;max-height:40vh;display:grid;overflow-y:auto}.account,.account-setup,.feedback{gap:8px;display:grid}.account-name{margin:0;font-weight:700}.account-setup input,.feedback textarea{border:1px solid var(--color-rule);background:var(--color-surface);min-height:44px;font:inherit;color:inherit;border-radius:10px;padding:8px 10px}.feedback textarea{resize:vertical}.feedback .counter{text-align:right}.sent-feedback{font-size:var(--text-small);gap:6px;margin:0;padding:0;list-style:none;display:grid}.sent-feedback p{white-space:pre-wrap;overflow-wrap:anywhere;margin:0}.sent-feedback .when{color:var(--color-ink-soft)}.visually-hidden{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}