:root{color-scheme:light;--bg:#e9ebe7;--ink:#142e29;--muted:#5d7269;--line:#bdc9c0;--dark:#183f36;--accent:#1e7c62;--paper:#f9faf6;--pale:#dfe7de;--font:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP",system-ui,sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth}body{margin:0;background:var(--bg);font-family:var(--font);color:var(--ink);-webkit-font-smoothing:antialiased;padding-left:env(safe-area-inset-left,0px);padding-right:env(safe-area-inset-right,0px)}
a{color:inherit;text-decoration:none}button,select{font:inherit}button,select{touch-action:manipulation}
button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}
:focus-visible{outline:3px solid #35a080;outline-offset:3px}
button,input,select,textarea{font-family:var(--font)}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:20px;min-height:74px;padding:0 max(4.2vw,20px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;white-space:nowrap;letter-spacing:-.07em;font-size:22px;font-weight:800}
.brand-muted{color:#587469;font-weight:500}.brand strong{font-size:12px;letter-spacing:0;font-weight:750;background:var(--dark);color:#d1f3de;padding:5px 7px;border-radius:4px;margin-left:8px}
.mark{width:32px;height:32px;border-radius:7px;background:#204b3e;color:#bcf8d5;display:grid;place-items:center;margin-right:10px;font-size:18px}
.topbar-note{font:700 11px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.1em;color:var(--muted)}
.topbar-share{font-size:12px;padding:10px 14px;border:1px solid #88a99a;border-radius:6px;font-weight:720;white-space:nowrap}
.topbar-share:hover{background:#d7e5d9}
main{max-width:1500px;margin:0 auto}
.hero{padding:75px max(4.2vw,20px) 78px;border-bottom:1px solid var(--line)}
.hero-meta{display:flex;justify-content:space-between;gap:15px;align-items:center}.eyebrow,.hero-index,.list-heading,.toc-heading,.practice-label,.pg-head,.live-output{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.06em}
.eyebrow,.hero-index{font-size:11px;font-weight:750;color:#567369}
.live-dot{width:8px;height:8px;display:inline-block;border-radius:50%;background:#2e9a73;box-shadow:0 0 0 4px #cbe9d8;margin-right:10px}
.hero h1{margin:35px 0 34px;font-size:clamp(41px,5.5vw,82px);font-weight:870;letter-spacing:-.075em;line-height:1.22}.hero h1 span{color:#2b7c61}
.hero-bottom{display:flex;justify-content:space-between;align-items:end;gap:36px}.hero-bottom p{color:#536b5f;line-height:2;margin:0;font-size:15px;max-width:770px}.hero-bottom strong{color:var(--dark)}
.start-link{min-width:182px;background:var(--dark);color:#ecfff1;padding:15px 20px;display:flex;gap:12px;justify-content:space-between;align-items:center;border-radius:7px;font-size:13px;font-weight:760}.start-link span:last-child{font-size:19px}
.content-shell{display:grid;grid-template-columns:230px minmax(0,1fr);gap:55px;padding:0 max(4.2vw,20px) 85px}
.toc{align-self:start;position:sticky;top:18px;padding-top:51px}
.toc-heading{display:flex;justify-content:space-between;border-bottom:1px solid #adc2b4;padding-bottom:16px;font-size:11px;font-weight:760}
.toc-heading span{color:#658175}
.toc nav{padding-top:12px;display:flex;flex-direction:column;gap:2px}
.toc nav a{display:flex;align-items:baseline;gap:13px;padding:10px 8px;border-radius:5px;font-size:12px;color:#476456;transition:background .15s}
.toc nav a:hover,.toc nav a:focus-visible{background:#d8e4da;color:#163f31}
.toc nav a small{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;color:#699b85;font-weight:750}
.toc p{font-size:11px;line-height:1.85;color:#839389;border-top:1px solid var(--line);padding-top:16px;margin-top:18px}
.patterns{min-width:0}.list-heading{display:flex;justify-content:space-between;padding:34px 0 23px;border-bottom:2px solid var(--ink);font-size:11px;font-weight:800;color:#436153}.list-heading span+span{color:#718c7c}
.practice{display:grid;grid-template-columns:126px minmax(0,1fr);gap:27px;border-bottom:1px solid var(--line);padding:45px 0 50px;scroll-margin-top:15px}
.practice-label{padding-top:6px;display:flex;flex-direction:column;gap:13px;color:#769583;font-size:10px;font-weight:750;white-space:nowrap}
.practice-label .num{font-size:31px;font-weight:750;color:#26785d;line-height:1}
.practice-body{min-width:0}.practice h2{font-size:clamp(22px,2.15vw,32px);letter-spacing:-.065em;margin:0 0 13px;line-height:1.4}.lead{font-size:13px;line-height:1.95;color:#556d61;margin:0 0 24px;max-width:810px}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em}.lead code{background:#d9e4db;border-radius:3px;padding:2px 4px;color:#1b5f49;white-space:normal;overflow-wrap:anywhere}
.playground{border:1px solid #c3d3c7;border-radius:9px;background:#f8faf5;overflow:hidden}
.pg-head{padding:15px 18px;display:flex;align-items:center;justify-content:space-between;gap:13px;background:#e1eae1;border-bottom:1px solid #c9d8ca;font-size:11px}
.pg-head strong{font-size:12px;letter-spacing:0}.mode-field{display:flex;align-items:center;gap:11px;font-size:10px;color:#536e5e;font-weight:650;letter-spacing:0}
.mode-field select{max-width:230px;min-height:36px;padding:6px 27px 6px 10px;border:1px solid #aac4b2;border-radius:5px;background:#f9fdf9;font-size:11px;color:#224a39}
.pg-note{display:flex;flex-direction:column;gap:6px;line-height:1.6;font-size:12px}.pg-note>span{font-size:11px;color:#6d8273}
.tap-play{padding:26px;display:grid;grid-template-columns:minmax(0,1.2fr) 1fr;gap:22px;align-items:center}
.tap-target{border:0;background:#20483e;color:#edfff2;font-size:14px;font-weight:750;min-height:98px;border-radius:8px;display:flex;align-items:center;justify-content:center;gap:17px;touch-action:manipulation}
.tap-target:active{background:#2e765c}
.tap-counter{font:800 25px ui-monospace,SFMono-Regular,Menlo,monospace;color:#b8f3d0}
.inline-note{font-size:11px;line-height:1.8;color:#678273;margin:0;padding:14px 20px}
.scroll-box{height:188px;overflow-y:auto;overscroll-behavior:contain;background:#fff;margin:20px 22px 0;border:1px solid #b8cbbd;border-radius:6px;scrollbar-width:thin}
.scroll-box>div{display:flex;justify-content:space-between;padding:13px 17px;border-bottom:1px solid #e0e8e0;font:700 12px ui-monospace,SFMono-Regular,Menlo,monospace;color:#426c59}.scroll-box>div span{font:500 12px var(--font);color:#647c6e}
.selection-pair{display:grid;grid-template-columns:1fr 1fr;gap:15px;padding:23px}
.selection-pair>div{min-width:0}.selection-pair small{display:block;margin-top:9px;color:#758a7d;font-size:10px}
.selection-target,.selection-ordinary{margin:0;min-height:83px;border-radius:7px;padding:15px;display:flex;align-items:center;justify-content:center}
.selection-target{background:#1f483a;color:#e6ffed;font-weight:800;gap:10px;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none;touch-action:manipulation}
.selection-target span{color:#b1edcd}
.selection-ordinary{background:#e4eae1;border:1px dashed #9cb6a4;line-height:1.6;font-size:12px;user-select:text}
.drag-stage{height:218px;position:relative;overflow:hidden;touch-action:none;user-select:none;background-color:#17332f;background-image:linear-gradient(#fff1 1px,transparent 1px),linear-gradient(90deg,#fff1 1px,transparent 1px);background-size:32px 32px}
.drag-token{width:62px;height:62px;border:3px solid #baf2d1;border-radius:50%;position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:flex;align-items:center;justify-content:center;background:#51ae80;box-shadow:0 0 0 8px #a3e1c51c,0 5px 19px #0003;cursor:grab;touch-action:none;user-select:none;-webkit-user-select:none}
.drag-token.is-dragging{cursor:grabbing;background:#84dcab;box-shadow:0 0 0 14px #a3e1c51c,0 5px 19px #0003}
.drag-token>span{color:#fff;font-size:34px;pointer-events:none}
.stage-grid-note{position:absolute;right:14px;bottom:12px;color:#96d2af88;font:700 9px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.08em;pointer-events:none}
.live-output{font-weight:760;color:#337b5c;font-size:11px}
.viewport-metrics{display:grid;grid-template-columns:repeat(3,1fr);border-bottom:1px solid #ccd7cc}
.viewport-metrics>div{display:flex;flex-direction:column;gap:6px;padding:20px;border-right:1px solid #d3dfd4}.viewport-metrics>div:last-child{border-right:0}
.viewport-metrics small{font:700 10px ui-monospace,SFMono-Regular,Menlo,monospace;color:#698372}.viewport-metrics strong{font-size:26px;font-variant-numeric:tabular-nums;letter-spacing:-.06em}.viewport-metrics .preferred-metric{background:#d8eada}
.viewport-screen{margin:21px 20px 0;aspect-ratio:16/6;min-height:160px;background:#1c3f37;display:flex;flex-direction:column;border:1px solid #133a2b;position:relative;overflow:hidden;color:#ddf3e5;border-radius:5px}
.viewport-safe-top,.viewport-safe-bottom{display:block;flex:none;text-align:center;padding:10px;min-height:35px;border-bottom:1px dashed #bbe6cc77;font-size:11px;background:#285b47}
.viewport-safe-bottom{border-bottom:0;border-top:1px dashed #bbe6cc77;margin-top:auto;padding-bottom:max(10px,env(safe-area-inset-bottom, 0px))}
.viewport-safe-bottom>span{color:#a3d8bc;font:700 10px ui-monospace,SFMono-Regular,Menlo,monospace}
.viewport-center{flex:1;display:grid;place-items:center;font:700 16px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.07em}
.action-button{min-height:47px;border:1px solid #214e3e;background:#205240;color:#f1fff4;border-radius:6px;padding:11px 17px;font-size:13px;font-weight:740;display:inline-flex;align-items:center;justify-content:center;gap:10px}
.action-button:hover{background:#276c51}.action-icon{font-size:20px}
.audio-play .action-button{margin:23px 20px 0}
.timer-display{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;padding:21px 23px 6px}
.timer-display strong{font:750 56px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:-.055em;color:#1e5b44;font-variant-numeric:tabular-nums}
.timer-display>span{font:700 12px ui-monospace,SFMono-Regular,Menlo,monospace;color:#779587}
.timer-bar{flex:0 0 100%;height:7px;border-radius:6px;background:#d4e0d3;overflow:hidden;margin:5px 0 0}
.timer-bar>span{display:block;width:0;height:100%;background:#39926c;transition:width .08s linear}
.two-actions{display:flex;gap:9px;padding:15px 22px 0}.outline-button{min-height:47px;border:1px solid #b2cbbc;background:#fff;color:#294b3c;border-radius:6px;padding:10px 18px;font-size:12px;font-weight:720}
.canvas-demo{padding:20px;display:grid;grid-template-columns:220px minmax(0,1fr);align-items:center;gap:24px}
.canvas-demo canvas{display:block;width:210px;height:160px;max-width:100%;image-rendering:auto;border-radius:5px;background:#173c33;border:1px solid #2a5544}
.pixel-readout{display:flex;flex-direction:column;gap:9px}.pixel-readout strong{font:700 24px ui-monospace,SFMono-Regular,Menlo,monospace;color:#296849;letter-spacing:-.06em;overflow-wrap:anywhere}.pixel-readout>span{font-size:11px;color:#708b78}.pixel-readout>small{font:700 11px ui-monospace,SFMono-Regular,Menlo,monospace;color:#548471}
.fullscreen-stage{margin:18px 20px 0;background:#203d36;border-radius:6px;min-height:154px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:17px;color:#cae8d4}
.fullscreen-stage>span{font:700 12px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.05em}
.fullscreen-stage .action-button{border-color:#87d3ae;background:#bdf0ce;color:#153d2e}
.fullscreen-stage:fullscreen{width:100%;height:100%;border-radius:0}
.code-detail{margin-top:16px}
.code-detail summary{cursor:pointer;color:#396951;list-style:none;font-size:12px;font-weight:720;padding:8px 0;touch-action:manipulation}
.code-detail summary::before{content:'＋';display:inline-block;margin-right:8px;color:#419775}
.code-detail[open] summary::before{content:'−'}
.code-detail pre{background:#19312b;color:#ddffec;margin:8px 0 0;padding:18px 20px;border-radius:7px;overflow-x:auto;line-height:1.75;font-size:12px;white-space:pre}
.sharing-example{border:1px solid #bbd0be;border-radius:8px;padding:22px;background:#f8faf5;display:grid;grid-template-columns:174px 1fr;align-items:center;gap:25px}
.sharing-preview{aspect-ratio:1;background:radial-gradient(circle at 50% 35%,#1d5c51,#071822 85%);color:#e7fff3;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:14px;border-radius:5px;box-shadow:0 7px 15px #122b261a}
.sharing-preview strong{font:850 35px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:-.07em}
.sharing-preview>span{font:700 9px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.1em;color:#a8e4c6}
.sharing-example>div+div>strong{font-size:15px}.sharing-example p{font-size:12px;line-height:1.85;color:#5e7664;max-width:400px}
.demo-link{display:inline-flex;align-items:center;gap:14px;border-radius:6px;background:#1e4d3b;color:#f0fff4;font-size:12px;font-weight:750;padding:13px 16px;touch-action:manipulation}
.endnote{border-top:1px solid var(--line);padding:80px max(4.2vw,20px) 92px;background:#dce6dc}
.endnote h2{font-size:clamp(24px,3.3vw,42px);letter-spacing:-.05em;line-height:1.5;margin:20px 0}.endnote p{font-size:13px;line-height:2;color:#526d5f;max-width:730px}
footer{border-top:1px solid var(--line);display:flex;gap:15px;align-items:center;justify-content:space-between;padding:25px max(4.2vw,20px);font-size:10px;color:#718778;flex-wrap:wrap}
footer span:first-child{font:700 11px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.05em;color:#35654b}
footer a{font-weight:750;color:#315d48}
@media(max-width:1130px){.content-shell{grid-template-columns:176px minmax(0,1fr);gap:28px}.practice{grid-template-columns:88px minmax(0,1fr);gap:15px}.practice-label{white-space:normal}.pg-head{flex-wrap:wrap}.toc nav a{gap:9px;padding-inline:4px}}
@media(max-width:840px){.topbar-note{display:none}.hero{padding-top:55px;padding-bottom:56px}.hero-bottom p{font-size:13px}.content-shell{display:block}.toc{position:static;padding:20px 0 14px}.toc-heading,.toc p{display:none}.toc nav{flex-direction:row;flex-wrap:nowrap;overflow-x:auto;gap:7px;padding:5px 0 13px;scrollbar-width:thin}.toc nav a{white-space:nowrap;border:1px solid #bdd1c2;padding:8px 11px;font-size:11px;flex:none}.toc nav a small{font-size:10px}.practice{grid-template-columns:75px minmax(0,1fr)}.list-heading{padding-top:23px}}
@media(max-width:570px){.topbar{min-height:65px;padding-inline:16px;gap:10px}.brand{font-size:18px}.brand strong{font-size:9px;padding:4px}.mark{width:28px;height:28px;margin-right:6px}.topbar-share{font-size:10px;padding:9px 10px}.hero{padding:47px 16px 42px}.hero-index{display:none}.eyebrow{font-size:10px}.hero h1{margin:27px 0 25px;font-size:clamp(32px,8.5vw,48px);line-height:1.28}.hero-bottom{display:block}.hero-bottom p{font-size:12px;line-height:1.9}.hero-bottom br{display:none}.start-link{margin-top:22px;max-width:230px;min-width:0}.content-shell{padding:0 16px 50px}.practice{display:block;padding:34px 0 39px}.practice-label{display:flex;flex-direction:row;align-items:center;gap:11px;margin-bottom:12px;font-size:10px}.practice-label .num{font-size:23px}.practice h2{font-size:23px;margin-bottom:11px}.lead{font-size:12px;line-height:1.85;margin-bottom:18px}.pg-head{padding:13px 14px;font-size:10px}.mode-field{font-size:10px;max-width:100%;width:100%;justify-content:space-between}.mode-field select{max-width:72%;font-size:10px}.tap-play{display:flex;flex-direction:column;padding:16px;gap:15px;align-items:stretch}.tap-target{min-height:86px}.selection-pair{padding:14px;gap:10px}.selection-target,.selection-ordinary{font-size:11px;padding:9px;min-height:100px}.viewport-metrics>div{padding:13px 8px}.viewport-metrics small{font-size:8px}.viewport-metrics strong{font-size:20px}.viewport-screen{min-height:150px;aspect-ratio:auto;margin:14px}.canvas-demo{grid-template-columns:1fr;gap:10px;padding:14px}.canvas-demo canvas{width:210px;max-width:100%}.timer-display strong{font-size:45px}.sharing-example{grid-template-columns:110px 1fr;gap:15px;padding:15px}.sharing-preview strong{font-size:23px}.sharing-example>div+div>strong{font-size:12px}.sharing-example p{font-size:11px}.sharing-preview{gap:8px}.sharing-preview>span{font-size:7px}.endnote{padding:58px 16px}.endnote h2{font-size:25px}.endnote h2 br{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}

@media(max-width:360px){.topbar{padding-inline:12px;gap:6px}.brand{font-size:16px}.brand strong{font-size:8px;padding:3px;margin-left:5px}.topbar-share{font-size:9px;padding:8px}.mark{width:25px;height:25px;margin-right:5px}}