:root{color-scheme:light;--paper: #f4f0e6;--paper-deep: #e7e0cf;--surface: #fffdf7;--ink: #172522;--muted: #58635f;--forest: #1e4b42;--forest-dark: #143a33;--gold: #d9aa45;--gold-soft: #f4dfae;--coral: #b8553f;--line: #d9d3c4;--shadow: 0 22px 60px rgba(37, 48, 43, .12);--radius-lg: 24px;--radius-md: 14px;font-family:Hiragino Kaku Gothic ProN,Yu Gothic,Meiryo,sans-serif;background:var(--paper);color:var(--ink)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px;background:var(--paper);line-height:1.75}button,textarea,select{font:inherit}button,summary,.dropzone{-webkit-tap-highlight-color:transparent}button:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible,.dropzone:focus-within{outline:3px solid rgba(184,85,63,.38);outline-offset:3px}.site-header,main,footer{width:min(1120px,calc(100% - 40px));margin-inline:auto}.site-header{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:26px 0}.brand{display:inline-flex;align-items:center;gap:12px;color:inherit;text-decoration:none}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:var(--forest);color:var(--gold-soft);font:800 22px/1 Georgia,serif;transform:rotate(-3deg)}.brand-symbol{background:transparent;overflow:hidden}.brand-symbol img{display:block;width:100%;height:100%}.brand b{display:block;font:800 15px/1.2 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.12em}.brand small{display:block;margin-top:4px;color:var(--muted);font-size:14px}.local-badge{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border:1px solid #bdd2c8;border-radius:999px;color:var(--forest);background:#edf5ee;font-size:14px;font-weight:700}.local-badge span{color:#4d9a70;font-size:14px}.hero{padding:78px 0 48px}.eyebrow,.step-label{margin:0 0 10px;color:var(--coral);font:800 14px/1.2 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.13em}.hero h1{max-width:920px;margin:0;font-family:Yu Mincho,Hiragino Mincho ProN,serif;font-size:clamp(42px,8vw,84px);line-height:1.12;letter-spacing:-.045em}.hero h1 span{color:var(--forest)}.hero-copy{max-width:720px;margin:28px 0 0;color:var(--muted);font-size:16px}.tool-shell{position:relative;padding:clamp(24px,5vw,50px);overflow:hidden;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow)}.tool-shell:before{content:"";position:absolute;top:-90px;right:-70px;width:250px;height:250px;border:34px solid rgba(217,170,69,.16);border-radius:50%;pointer-events:none}.tool-heading-row,.file-meta,footer{display:flex;align-items:flex-start;justify-content:space-between;gap:24px}h2{margin:0;font-family:Yu Mincho,Hiragino Mincho ProN,serif;font-size:clamp(24px,4vw,36px);line-height:1.35}.text-button{padding:7px 0;border:0;border-bottom:1px solid currentColor;background:transparent;color:var(--forest);cursor:pointer;font-weight:700}#sourceText,#resultText{width:100%;border:1px solid #cbc4b3;border-radius:var(--radius-md);background:#fff;color:var(--ink);font-family:ui-monospace,SFMono-Regular,Consolas,BIZ UDPGothic,monospace;line-height:1.7;resize:vertical}#sourceText,#resultText{min-height:280px;padding:18px;font-size:15px}#sourceText::placeholder,#resultText::placeholder{color:#9a988f}#resultText{background:#f7f8f4}.repair-grid{display:grid;grid-template-columns:minmax(0,1fr) 42px minmax(0,1fr);align-items:start;margin-top:28px}.editor-panel{min-width:0}.editor-heading{display:flex;align-items:baseline;gap:10px;margin-bottom:10px}.editor-heading span{padding:3px 7px;border-radius:5px;background:var(--paper-deep);color:var(--muted);font:800 14px ui-monospace,monospace}.editor-heading label{font-size:14px;font-weight:800}.flow-arrow{display:grid;place-items:center;min-height:280px;color:var(--coral);font:700 24px/1 Georgia,serif}.primary-actions{display:flex;align-items:center;gap:10px;margin-top:14px;flex-wrap:wrap}.primary-button,.secondary-button,.copy-button{border-radius:10px;cursor:pointer;font-weight:800;transition:transform .15s ease,background .15s ease,border-color .15s ease}.primary-button{display:inline-flex;align-items:center;justify-content:space-between;gap:36px;min-width:240px;padding:14px 18px;border:1px solid var(--forest);background:var(--forest);color:#fff}.primary-button:hover{background:var(--forest-dark);transform:translateY(-1px)}.primary-button:disabled{opacity:.45;cursor:not-allowed;transform:none}.primary-button.compact{min-width:210px;margin-top:16px}.secondary-button{padding:14px 18px;border:1px solid var(--line);background:transparent;color:var(--ink)}.secondary-button:hover{border-color:var(--ink)}.shortcut{margin:8px 0 0;color:var(--muted);font-size:14px}.status{min-height:1.75em;margin:0;color:var(--forest);font-size:14px;font-weight:700}.result-actions{display:flex;align-items:center;gap:14px;margin-top:14px}.copy-button{min-width:104px;padding:9px 14px;border:1px solid var(--forest);background:transparent;color:var(--forest)}.copy-button:hover,.copy-button.copied{background:var(--forest);color:#fff}.copy-button:disabled{opacity:.42;cursor:not-allowed;background:transparent;color:var(--forest)}.result-copy{min-height:48px}.alternatives{margin-top:14px;border-top:1px solid var(--line)}.alternatives summary{padding:14px 2px 8px;cursor:pointer;color:var(--muted);font-size:14px;font-weight:700}.alternate-list{display:flex;gap:8px;flex-wrap:wrap;padding:4px 0 2px}.alternate-button{padding:8px 11px;border:1px solid var(--line);border-radius:8px;background:transparent;color:var(--ink);cursor:pointer;font-size:14px;font-weight:700}.alternate-button:hover{border-color:var(--forest);color:var(--forest)}.trust-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin:28px 0 72px;border-block:1px solid var(--line)}.trust-strip article{position:relative;padding:28px}.trust-strip article+article{border-left:1px solid var(--line)}.trust-strip span{position:absolute;top:28px;right:28px;color:#a7a090;font:700 14px ui-monospace,monospace}.trust-strip h3{margin:0 0 8px;font-size:15px}.trust-strip p{margin:0;color:var(--muted);font-size:14px}.file-tool{margin:0 0 84px}.file-tool>details{border:1px solid var(--line);border-radius:var(--radius-lg);background:#ebe4d5;overflow:hidden}.file-tool summary{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:28px 32px;cursor:pointer;list-style:none}.file-tool summary::-webkit-details-marker{display:none}.file-tool summary span:first-child{display:flex;align-items:center;gap:18px}.file-tool summary small{padding:5px 8px;border-radius:6px;background:var(--forest);color:#fff;font:700 14px ui-monospace,monospace}.file-tool summary strong{font-family:Yu Mincho,Hiragino Mincho ProN,serif;font-size:20px}.summary-action{color:var(--forest);font-size:14px;font-weight:800}.file-tool-body{padding:0 32px 32px}.section-intro{max-width:720px;margin:0 0 20px;color:var(--muted);font-size:14px}.dropzone{display:grid;place-items:center;min-height:180px;padding:25px;border:2px dashed #a8a18f;border-radius:var(--radius-md);background:#ffffff73;cursor:pointer;text-align:center}.dropzone.dragging{border-color:var(--coral);background:#fff7e8}.dropzone input{position:absolute;width:1px;height:1px;opacity:0}.drop-icon{font:300 34px/1 Georgia,serif;color:var(--coral)}.dropzone strong{margin-top:8px}.dropzone small{margin-top:4px;color:var(--muted)}.file-result{margin-top:22px;padding:22px;border-radius:var(--radius-md);background:var(--surface)}.file-meta{justify-content:flex-start}.file-meta>div{min-width:210px}.file-meta small,.preview-box small{display:block;color:var(--muted);font-size:11px}.file-meta strong{display:block;margin-top:4px;word-break:break-word}.encoding-settings{display:flex;align-items:end;gap:14px;margin-top:22px}.encoding-settings label{display:grid;gap:7px;flex:1;color:var(--muted);font-size:14px}.encoding-settings select{width:100%;padding:11px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink)}.preview-box{margin-top:20px;padding:14px;border:1px solid var(--line);border-radius:9px;background:#fff}.preview-box pre{max-height:180px;margin:7px 0 0;overflow:auto;white-space:pre-wrap;word-break:break-all;font:12px/1.65 ui-monospace,monospace}.warning{margin:12px 0 0;font-size:14px;font-weight:700}.warning.safe{color:#347155}.warning.danger{color:var(--coral)}.guide{display:grid;grid-template-columns:.85fr 1.4fr;gap:60px;margin-bottom:90px}.guide-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.guide-grid article{padding:24px;border-top:3px solid var(--forest);background:#ffffff6b}.guide-grid article+article{border-top-color:var(--coral)}.guide-kicker{margin:0 0 14px;font-size:14px;font-weight:800;letter-spacing:.08em}.guide-kicker.good{color:var(--forest)}.guide-kicker.bad{color:var(--coral)}.guide-grid h3{margin:0 0 10px;font-size:17px}.guide-grid article>p:last-child{margin:0;color:var(--muted);font-size:14px}.faq{max-width:820px;margin-bottom:90px}.faq h2{margin-bottom:24px}.faq details{border-top:1px solid var(--line)}.faq details:last-child{border-bottom:1px solid var(--line)}.faq summary{padding:18px 4px;cursor:pointer;font-weight:800}.faq details p{margin:-5px 0 20px;color:var(--muted);font-size:14px}footer{align-items:end;padding:28px 0 42px;border-top:1px solid var(--line)}footer b{font:800 14px ui-monospace,monospace;letter-spacing:.14em}footer p{margin:5px 0 0;color:var(--muted);font-size:14px}footer nav{display:flex;flex:none;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:22px;color:var(--muted);font-size:14px}footer nav a,footer nav span{white-space:nowrap}footer nav a{color:inherit;text-decoration:none}footer nav a:hover{color:var(--forest);text-decoration:underline}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:780px){main{width:min(100% - 28px,1120px)}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition-duration:.01ms!important}}.puzzle-page main{width:min(1280px,100%);margin:0 auto;padding:18px 16px 32px}.puzzle-page h1{font-size:clamp(28px,4vw,42px);margin:0 0 16px;text-align:left}.puzzle-app{max-width:960px;margin:auto;background:#fffaf3;border:1px solid #e5dacb;border-radius:18px;padding:16px;box-shadow:0 6px 24px #4e382d0b}.puzzle-app button{cursor:pointer;border:0;border-radius:9px;background:#86674d;color:#fff;font-weight:700;padding:10px 14px;min-height:42px}.puzzle-app button:hover{filter:brightness(1.08)}.puzzle-app button:focus-visible{outline:3px solid #157b66;outline-offset:3px}.puzzle-app button:disabled{cursor:default;opacity:.4}.puzzle-toolbar{display:flex;align-items:center;gap:8px;margin:0}.number-puzzle-page .puzzle-toolbar{width:100%;box-sizing:border-box;flex-wrap:wrap}.number-puzzle-page .puzzle-toolbar>button{box-sizing:border-box;width:auto;min-width:0;max-width:100%;min-height:32px;flex:0 0 auto;margin:0 0 0 auto;padding:5px 10px;white-space:nowrap;font-size:var(--puzzle-action-size,13px)}.klotski-page .puzzle-toolbar{width:100%;box-sizing:border-box;flex-wrap:wrap}.klotski-page .klotski-actions{display:flex;align-items:center;justify-content:flex-end;gap:6px;margin-left:auto;flex-wrap:wrap}.klotski-page .klotski-actions button{box-sizing:border-box;width:auto;min-width:0;max-width:100%;min-height:32px;flex:0 0 auto;margin:0;padding:5px 10px;white-space:nowrap;font-size:var(--puzzle-action-size,13px)}.puzzle-stats{display:flex;gap:7px;flex-shrink:0}.puzzle-stats span{display:grid;gap:2px;background:#eee4d8;color:#766354;text-align:center;padding:6px 11px;border-radius:9px;font-size:var(--puzzle-stat-size,11px)}.puzzle-stats output{color:#42362c;font-size:22px;font-weight:800;font-variant-numeric:tabular-nums}.puzzle-status{font-size:14px;text-align:center;margin:12px 0;min-height:21px;color:#776251}.puzzle-stage{position:relative;touch-action:none;-webkit-user-select:none;user-select:none}.number-board{position:relative;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-template-rows:repeat(4,minmax(0,1fr));gap:10px;background:#bbada0;padding:10px;border-radius:10px;aspect-ratio:1}.number-cell{min-width:0;min-height:0;border-radius:6px;background:#cdc1b4}.number-tile-layer{position:absolute;inset:0;z-index:1;display:grid;grid-template-columns:inherit;grid-template-rows:inherit;gap:inherit;padding:inherit;box-sizing:border-box;pointer-events:none}.number-tile{display:flex;align-items:center;justify-content:center;background:#cdc1b4;border-radius:6px;font-size:clamp(18px,3vw,44px);font-weight:800;color:#776e65;min-width:0;min-height:0;white-space:nowrap;font-variant-numeric:tabular-nums;transform-origin:top left;will-change:transform}.number-tile[data-value="2"]{background:#eee4da}.number-tile[data-value="4"]{background:#ede0c8}.number-tile[data-value="8"]{background:#f2b179;color:#fff}.number-tile[data-value="16"]{background:#f59563;color:#fff}.number-tile[data-value="32"]{background:#f67c5f;color:#fff}.number-tile[data-value="64"]{background:#f65e3b;color:#fff}.number-tile[data-value="128"]{background:#edcf72;color:#fff}.number-tile[data-value="256"]{background:#edcc61;color:#fff}.number-tile[data-value="512"]{background:#edc850;color:#fff}.number-tile[data-value="1024"]{background:#edc53f;color:#fff}.number-tile[data-value="2048"]{background:#edc22e;color:#fff;box-shadow:0 0 16px #edc22e88}.number-tile.tile-super{background:#3c3a32;color:#fff}.number-tile.tile-long{font-size:clamp(11px,1.5vw,22px)}.wood-board{position:relative;aspect-ratio:4/5;border:8px solid #71503b;border-bottom-color:transparent;border-radius:10px;background:repeating-linear-gradient(0deg,#8b674e 0 2px,#906c53 3px 15px);box-shadow:inset 0 0 15px #42302455}.wood-board .wood-piece{position:absolute;display:grid;place-items:center;box-sizing:border-box;left:calc(var(--x)*25% + 3px);top:calc(var(--y)*20% + 3px);width:calc(var(--w)*25% - 6px);height:calc(var(--h)*20% - 6px);background:linear-gradient(100deg,#f4d5a0,#e9be80 55%,#f2d097);color:#684123;border:2px solid #d09b58;border-radius:8px;box-shadow:0 3px #533a2966,inset 0 1px #fff8;font-family:serif;font-size:clamp(18px,3vw,38px);line-height:1;white-space:nowrap;text-align:center;padding:0;touch-action:none;transition:left 90ms,top 90ms}.wood-board .wood-piece.is-double-label{font-size:clamp(16px,2.4vw,28px)}.wood-board .wood-piece.daughter{background:linear-gradient(130deg,#cd7154,#b95540);border-color:#9c4233;color:#fff6e7;font-size:clamp(36px,7vw,76px)}.wood-board .wood-piece.selected{outline:3px solid #fff5a3;outline-offset:-6px;box-shadow:0 3px #533a2966,inset 0 0 18px #fff6}.wood-board .wood-piece:disabled{opacity:1}.wood-exit{width:50%;margin:0 auto;padding:4px;text-align:center;background:#f1dfc5;color:#79513c;font-size:14px;font-weight:700;border-radius:0 0 8px 8px}.puzzle-message{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;z-index:5;background:#fff4dfdf;text-align:center;border-radius:10px;padding:20px}.puzzle-message[hidden],.puzzle-message button[hidden]{display:none}.puzzle-message strong{display:block;font-size:30px;color:#785b43}.puzzle-message p{font-size:15px;color:#785b43;line-height:1.7}.puzzle-message button{display:block;width:100%;margin:10px 0;background:#68874f}.puzzle-message button+button{background:#86674d}.puzzle-directions{display:grid;grid-template-columns:repeat(3,44px);grid-template-rows:repeat(2,42px);gap:4px;justify-content:center;margin:12px auto 0}.puzzle-directions [data-direction="0"]{grid-column:2}.puzzle-directions [data-direction="3"]{grid-column:1;grid-row:2}.puzzle-directions [data-direction="2"]{grid-column:2;grid-row:2}.puzzle-directions [data-direction="1"]{grid-column:3;grid-row:2}.puzzle-directions button{font-size:24px;padding:0;background:#8b7765}.puzzle-operation{font-size:var(--puzzle-operation-size,12px);text-align:center;color:#8a7765;margin:10px 0 0}.puzzle-guide{max-width:620px;margin:24px auto;color:#685c51}.puzzle-guide h2{font-size:18px}.puzzle-guide p{font-size:14px;line-height:1.9}.klotski-page .puzzle-app{max-width:490px}.number-puzzle-page .puzzle-app{max-width:620px}@media(max-width:520px){.puzzle-page main{padding:10px 10px 24px}.puzzle-page h1{font-size:28px;margin:0 0 10px}.puzzle-app{padding:10px;border-radius:12px}.number-board{gap:7px;padding:7px}.puzzle-status{font-size:var(--puzzle-status-size,12px);margin:9px 0}.puzzle-stats span{padding:4px 8px}.puzzle-stats output{font-size:20px}.number-puzzle-page .puzzle-toolbar{gap:5px}.number-puzzle-page .puzzle-toolbar>button{min-height:27px;padding:3px 6px;font-size:var(--puzzle-action-size,11px)}.klotski-page .puzzle-toolbar{gap:5px}.klotski-page .klotski-actions{gap:4px}.klotski-page .klotski-actions button{min-height:27px;padding:3px 6px;font-size:var(--puzzle-action-size,11px)}.puzzle-guide{margin:16px 4px}.wood-board{border-width:6px}}@media(prefers-reduced-motion:reduce){.wood-board .wood-piece{transition:none}}body.puzzle-page main{width:min(1280px,100%);max-width:1280px}.number-puzzle-page .puzzle-app{padding:0;overflow:hidden}.number-puzzle-page .puzzle-play-area{padding:16px}.number-puzzle-page .ranking-disclosure{max-width:none;margin:18px 16px 16px}.number-puzzle-page .puzzle-ranking{max-width:none;margin:0;padding:22px 8px 6px;border:0;border-top:1px solid #e0d6c5;border-radius:0;background:transparent;box-shadow:none}.puzzle-ranking-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}.puzzle-ranking-heading h2{margin:0;color:#143f35;font:900 25px Yu Mincho,serif}.puzzle-ranking-status{margin:8px 0;color:#66746f;font-size:14px;line-height:1.6}.puzzle-ranking-list{display:grid;gap:5px;margin:8px 0 0;padding:0;list-style:none}.puzzle-ranking-periods{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:16px}.puzzle-ranking-period{min-width:0;padding:12px;border:1px solid #e0d6c5;border-radius:8px;background:#fffdf8}.puzzle-ranking-period h3{margin:0;color:#143f35;font:900 16px Yu Mincho,serif}.puzzle-ranking-period .puzzle-ranking-status{min-height:1em;margin:8px 0}.puzzle-ranking-period .puzzle-ranking-status:empty{display:none}.puzzle-ranking-entry{display:grid;grid-template-columns:30px minmax(0,1fr) auto;align-items:center;gap:10px;padding:9px 10px;border-radius:6px;background:#f5f0e6;color:#183f35;font-size:14px}.puzzle-ranking-entry:first-child{background:#f5e6bc}.puzzle-ranking-position{color:#8b6a2a;font-weight:900;font-variant-numeric:tabular-nums}.puzzle-ranking-player{min-width:0;overflow-wrap:anywhere;font-size:14px;font-weight:800}.puzzle-ranking-score{color:#143f35;font-size:14px;font-weight:900;font-variant-numeric:tabular-nums;white-space:nowrap}.puzzle-message .puzzle-rank-name{display:grid;gap:5px;margin:12px 0;color:#785b43;text-align:left;font-size:14px;font-weight:800}.puzzle-message .puzzle-rank-name input{box-sizing:border-box;width:100%;min-height:38px;padding:7px 10px;border:1px solid #b8a48f;border-radius:7px;background:#fff;color:#42362c;font:inherit}.puzzle-message .puzzle-rank-name[hidden],.puzzle-message button[hidden]{display:none!important}.puzzle-message .puzzle-rank-submit-status{min-height:0;margin:4px 0 8px;font-size:14px;line-height:1.6}@media(max-width:900px){.puzzle-ranking-periods{grid-template-columns:1fr}}@media(max-width:520px){.number-puzzle-page .puzzle-play-area{padding:10px}.number-puzzle-page .puzzle-ranking{padding:22px 4px 6px}.puzzle-ranking-heading h2{font-size:21px}.puzzle-ranking-period{padding:12px}.puzzle-ranking-entry{grid-template-columns:24px minmax(0,1fr) auto;gap:5px;padding:8px}.puzzle-ranking-player,.puzzle-ranking-score{font-size:14px}}.ranking-disclosure>summary{display:inline-flex;align-items:center;gap:9px;padding:11px 16px;border:1px solid #cfc4ae;border-radius:7px;background:#fffdf8;color:#143f35;font-size:14px;font-weight:900;cursor:pointer;list-style:none}.ranking-disclosure>summary::-webkit-details-marker{display:none}.number-puzzle-page .ranking-disclosure>summary:before{content:none;display:none}.ranking-disclosure>summary:before{content:"▸";display:inline-block;width:12px;text-align:center}.ranking-disclosure[open]>summary:before{content:"▾"}.ranking-disclosure[open]>summary{margin-bottom:12px}@media(max-width:620px){.puzzle-toolbar button{box-sizing:border-box;min-width:0;max-width:100%;white-space:nowrap}}