:root{color-scheme:dark;--bg:#101716;--panel:#151e1b;--ink:#eaf0e9;--muted:#9eafa6;--line:#2c3832;--mint:#8cdeba;--orange:#edac7e;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink)}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,select{cursor:pointer}button{color:inherit}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--mint);outline-offset:5px}button{transition:background .15s,border-color .15s,color .15s}button:disabled{cursor:default;opacity:.4}.masthead{height:88px;padding:0 max(32px,calc((100vw - 1320px)/2));display:flex;align-items:center;gap:30px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;letter-spacing:.12em;font-size:15px}.brand b{font-weight:500;color:var(--mint)}.brand-mark{color:var(--mint);font-size:30px}.edition{font-size:11px;letter-spacing:.12em;color:var(--muted);margin-left:auto}.about-link{font-size:12px;text-decoration:none}.about-link span{color:var(--mint);margin-left:15px}main{max-width:1320px;margin:auto;padding:0 32px}.intro{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:58px 0 46px}.eyebrow{font:10px/1.5 var(--mono);letter-spacing:.19em;color:var(--mint);margin:0 0 14px}h1{font-size:clamp(30px,3.5vw,48px);letter-spacing:-.035em;font-weight:500;margin:0 0 18px}h1>span{color:var(--mint)}.subtitle{font-size:14px;color:var(--muted);line-height:1.9;margin:0}.mobile-break{display:none}.intro-note{display:flex;gap:22px;align-items:center;padding-right:18px;font-size:13px}.intro-note p{line-height:1.9}.intro-note p span{font-size:12px;color:var(--muted)}.small-orbit{display:block;width:51px;height:51px;border:1px solid var(--line);border-radius:50%;position:relative}.small-orbit:before{content:"";position:absolute;width:23px;height:23px;left:39px;top:12px;border:1px solid var(--mint);border-radius:50%}.small-orbit:after{content:"";position:absolute;width:5px;height:5px;left:57px;top:13px;background:var(--orange);border-radius:50%}.lab{border:1px solid var(--line);display:grid;grid-template-columns:246px minmax(0,1fr);border-radius:12px;overflow:hidden}.sidebar{padding:25px 20px;background:var(--panel);border-right:1px solid var(--line)}.section-label{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:22px}.section-label h2{font-size:13px;font-weight:500;margin:0}.section-label>span{color:var(--muted);font:10px var(--mono)}.country-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.country{border:1px solid transparent;border-radius:6px;background:transparent;min-width:0;display:flex;flex-direction:column;align-items:center;padding:11px 4px 12px;gap:8px}.country:hover{background:#202c26}.country[aria-pressed=true]{background:#23392e;border-color:#496f5c;color:var(--mint)}.country svg{width:66px;height:43px;overflow:visible}.country svg path{fill:currentColor;opacity:.65}.country[aria-pressed=true] svg path{opacity:1}.country .name{font-size:12px}.selection-note{display:flex;align-items:baseline;gap:8px;color:var(--muted);padding-top:22px;margin-top:19px;border-top:1px solid var(--line)}.selection-note p{margin:0;font-size:11px;line-height:1.9}.dot{width:4px;height:4px;border-radius:50%;background:var(--mint);flex:none}.experiment{min-width:0;background:radial-gradient(ellipse at 50% 35%,#1b2c24 0%,#121c17 65%);padding:24px 28px 15px}.canvas-header{display:flex;justify-content:space-between;align-items:center}.canvas-header .eyebrow{margin-bottom:5px;color:var(--muted);font-size:10px}.canvas-header h2{font-size:23px;font-weight:500;margin:0;letter-spacing:.08em}.live-state{display:flex;gap:8px;align-items:center;font-size:11px;color:var(--mint)}#state-dot{width:5px;height:5px;background:var(--mint);border-radius:50%}.live-state.is-paused{color:var(--muted)}.live-state.is-paused #state-dot{background:var(--muted)}.canvas-wrap{position:relative;height:365px;margin-top:10px;isolation:isolate}#drawing{display:block;width:100%;height:100%;background-image:radial-gradient(#354638 1px,transparent 1px);background-size:24px 24px;touch-action:pan-y}.canvas-coordinate{position:absolute;left:3px;bottom:12px;font:8px/1.7 var(--mono);letter-spacing:.1em;color:#829a89;pointer-events:none}.circle-number{position:absolute;right:0;top:0;display:flex;flex-direction:column;align-items:flex-end;pointer-events:none}.circle-number strong{font:500 49px/1.2 var(--mono);color:var(--mint);font-variant-numeric:tabular-nums;letter-spacing:-.08em}.circle-number span{font-size:10px;color:var(--muted);margin-top:4px}.circle-number small{font-size:9px;color:#a6b7ad}.plot-legend{display:flex;gap:16px;align-items:center;font-size:10px;color:var(--muted);margin:9px 0 20px;flex-wrap:wrap}.plot-legend>span{display:flex;gap:6px;align-items:center}.legend-line{width:17px;border-top:1px solid var(--muted)}.legend-line.dashed{border-top-style:dashed}.legend-line.trace{border-color:var(--mint);border-top-width:2px}.legend-point{width:5px;height:5px;border-radius:50%;background:var(--orange)}.plot-legend .round-detail{margin-left:auto;font-family:var(--mono);font-variant-numeric:tabular-nums}.playback{display:flex;align-items:center;gap:9px;padding-bottom:22px;border-bottom:1px solid var(--line)}.primary,.secondary{border-radius:5px;min-height:34px;font-size:11px;padding:0 13px;white-space:nowrap}.primary{background:var(--mint);color:#102b1c;border:1px solid var(--mint);min-width:65px;font-weight:500}.primary:hover{background:#b4f4d4}.secondary{background:transparent;border:1px solid #3b4b40}.secondary:hover{background:#27382d;border-color:#6c8c77}.lap-track{height:3px;flex:1;margin-left:8px;background:#2b3b30;border-radius:3px;overflow:hidden}.lap-track>div{height:100%;width:0;background:var(--mint)}.lap-value{font:10px var(--mono);min-width:32px;text-align:right;color:var(--muted)}.settings{display:grid;grid-template-columns:1.5fr 1fr;gap:35px;padding:21px 0 18px}.range-label{font-size:11px;min-width:0}.range-label>span:first-child{display:flex;justify-content:space-between;align-items:center}.range-label output{font-family:var(--mono);color:var(--mint);font-size:12px;font-variant-numeric:tabular-nums}.range-label input{width:100%;display:block;margin:14px 0 11px;accent-color:var(--mint);height:4px;cursor:ew-resize}.range-endpoints{display:flex;justify-content:space-between;font-size:9px;color:var(--muted)}.options{display:flex;gap:17px;align-items:center;flex-wrap:wrap;font-size:10px;color:#b7c7bc}.options label{display:flex;gap:5px;align-items:center;min-height:28px;cursor:pointer}.options input{accent-color:var(--mint);margin:0;width:12px;height:12px}.options .max-label{margin-left:auto}.options select{font-size:10px;background:#213026;border:1px solid #3b4d3f;border-radius:4px;padding:5px;color:var(--ink);max-width:100%}.status{font-size:10px;color:var(--muted);margin:12px 0 0;min-height:16px;line-height:1.6}.evolution{margin-top:44px}.evolution-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:23px}.evolution-heading h2{font-size:21px;font-weight:500;margin:0}.evolution-heading .eyebrow{margin-bottom:8px}.evolution-heading>p{font-size:11px;color:var(--muted);margin:0}.stages{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:13px}.stage{background:transparent;border:1px solid var(--line);border-radius:6px;padding:14px 15px;position:relative;min-width:0;text-align:left}.stage:hover{border-color:#648a71;background:#18281e}.stage[aria-pressed=true]{border-color:#739e80;background:#1b2b21}.stage canvas{width:100%;height:100px;display:block;margin-bottom:13px}.stage-label{display:flex;align-items:center;justify-content:space-between;font-size:11px;gap:5px}.stage-label>span:first-child{font-family:var(--mono);color:var(--mint)}.stage-label>span:last-child{color:var(--muted);font-size:9px}.principle{margin-top:66px;padding:45px 0;display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);gap:60px}.principle h2{font-size:29px;font-weight:500;line-height:1.6;margin:0}.formula{font:18px/1.6 Georgia,serif;color:var(--mint);letter-spacing:.08em;margin-top:27px}.principle-steps{display:flex;flex-direction:column;gap:24px}.principle-steps article{display:flex;gap:22px}.principle-steps article>span{font:11px/1.8 var(--mono);color:var(--mint);padding-top:2px}.principle h3{font-size:13px;font-weight:500;margin:0 0 7px}.principle article p{font-size:12px;line-height:1.9;color:var(--muted);margin:0}footer{border-top:1px solid var(--line);padding:28px 0 32px;font-size:10px;color:var(--muted);line-height:1.9}footer>div{display:flex;justify-content:space-between;gap:20px;margin-bottom:22px}footer p{margin:7px 0;max-width:1000px}footer a{text-underline-offset:3px}.footer-brand{font:11px var(--mono);letter-spacing:.1em;color:var(--ink)}
@media(min-width:1450px){.canvas-wrap{height:430px}.country{padding:16px 4px}.stage canvas{height:120px}}@media(max-width:1000px){.intro-note{display:none}.lab{grid-template-columns:190px minmax(0,1fr)}.sidebar{padding:22px 12px}.experiment{padding:22px 20px 15px}.country svg{width:55px;height:38px}.country{padding:13px 3px}.section-label>span{display:none}.options{gap:10px}.options .max-label{margin-left:0}.settings{gap:20px}.plot-legend{gap:12px}.round-detail{font-size:9px}}
@media(max-width:720px){.masthead{height:65px;padding:0 20px;gap:14px}.brand{font-size:12px}.edition{display:none}.about-link{font-size:10px;margin-left:auto}.about-link span{margin-left:3px}main{padding:0 20px}.intro{padding:36px 0 30px}.intro .eyebrow{font-size:9px}h1{font-size:34px;line-height:1.4;margin-bottom:12px}.subtitle{font-size:12px}.lab{display:flex;flex-direction:column}.sidebar{padding:18px 16px 12px;border-right:0;border-bottom:1px solid var(--line)}.section-label{margin-bottom:12px}.section-label>span{display:block}.country-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:4px}.country{padding:7px 1px;gap:5px}.country svg{width:43px;height:26px}.country .name{font-size:10px}.selection-note{margin-top:10px;padding-top:10px}.selection-note p{font-size:10px}.experiment{padding:19px 16px 15px}.canvas-wrap{height:330px}.circle-number strong{font-size:40px}.canvas-coordinate{font-size:7px}.plot-legend{font-size:9px;gap:12px;margin-bottom:15px}.plot-legend .round-detail{margin-left:0}.primary,.secondary{padding:0 9px;min-height:36px;font-size:10px}.playback{gap:6px}.lap-track{margin-left:3px}.settings{gap:23px;grid-template-columns:1.3fr 1fr}.options{gap:8px 13px}.options label{min-height:32px}.options input{width:15px;height:15px}.evolution{margin-top:30px}.evolution-heading{display:block}.evolution-heading>p{margin-top:10px}.evolution-heading h2{font-size:20px}.stages{gap:8px;grid-template-columns:repeat(3,minmax(0,1fr))}.stage{padding:10px 9px}.stage canvas{height:73px;margin-bottom:10px}.stage-label{display:block}.stage-label>span{display:block}.stage-label>span:last-child{margin-top:4px}.principle{margin-top:40px;padding-top:30px;grid-template-columns:1fr;gap:24px}.principle h2{font-size:24px}.formula{margin:18px 0 0}.principle-steps{gap:22px}footer>div{display:block}footer>div>span{display:block;margin-bottom:10px}}
@media(max-width:400px){main{padding:0 12px}.masthead{padding:0 14px}.mobile-break{display:block}h1{font-size:31px}.country svg{width:36px}.experiment{padding:18px 12px 12px}.canvas-wrap{height:285px}.lap-track{display:none}.lap-value{margin-left:auto}.plot-legend .round-detail{width:100%}.settings{gap:17px}.range-endpoints{font-size:8px}.circle-number span{max-width:100px}.canvas-coordinate{font-size:6px}.stage canvas{height:65px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

[hidden]{display:none!important}
.map-groups{display:grid;grid-template-columns:1fr 1fr;gap:5px;margin:0 0 18px}
.map-groups button{border:1px solid var(--line);border-radius:5px;background:transparent;color:var(--muted);font-size:11px;min-height:34px;padding:6px 3px}
.map-groups button:hover{color:var(--ink);background:#202c26}
.map-groups button[aria-pressed=true]{background:#2a3d31;color:var(--mint);border-color:#496f5c}
@media(max-width:720px){.map-groups{margin-bottom:12px}.map-groups button{min-height:40px}.province-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
.map-groups{grid-template-columns:repeat(3,minmax(0,1fr))}
.map-groups button{font-size:10px;white-space:nowrap}
.group-note{font-size:10px;line-height:1.7;color:var(--muted);margin:-5px 0 15px}
.country{position:relative}
.population-rank{position:absolute;left:5px;top:4px;font:9px var(--mono);color:var(--muted)}
.country .population{font:9px var(--mono);color:var(--muted);margin-top:-3px}
.country[data-shape=true] svg path{fill:none;stroke:currentColor;stroke-width:1;opacity:.9}
.legend-line.history{border-color:var(--mint);opacity:.3}
.progression-settings{display:flex;gap:18px;align-items:center;flex-wrap:wrap;font-size:11px;color:#c1d0c5;padding:0 0 14px}
.progression-settings label{display:flex;gap:6px;align-items:center;min-height:32px}
.progression-settings input[type=number]{width:53px;min-height:30px;padding:4px 5px;background:#213026;border:1px solid #3b4d3f;border-radius:4px;color:var(--mint);font:12px var(--mono)}
.progression-settings input[type=checkbox]{accent-color:var(--mint);width:14px;height:14px;margin:0}
.progression-settings select{background:#213026;border:1px solid #3b4d3f;border-radius:4px;color:var(--ink);font-size:11px;padding:5px;min-height:30px}
.history-hint{font-size:9px;color:var(--muted);margin-left:auto}
@media(max-width:720px){.province-grid{grid-template-columns:repeat(5,minmax(0,1fr))}.complex-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.country .population{font-size:8px}.population-rank{font-size:8px;left:2px;top:1px}.progression-settings{gap:5px 13px}.progression-settings input[type=number],.progression-settings select{font-size:16px;min-height:36px}.progression-settings input[type=number]{width:54px}.group-note{margin:0 0 12px}.history-hint{margin-left:0;width:100%;font-size:10px}.map-groups button{font-size:11px}.plot-legend{gap:10px 12px}}
.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}
.masthead{height:70px}
.intro{padding:34px 0}
.intro h1{margin:0}
.canvas-wrap{height:415px;margin:16px 0 20px}
.playback{padding-top:4px}
.stage-label>span:last-child{font-size:11px;color:var(--mint)}
.evolution{margin-top:26px}
.explanation{margin:34px 0 26px;border-top:1px solid var(--line);padding-top:20px}
.explanation>summary{color:var(--muted);font-size:12px;cursor:pointer;width:fit-content}
.explanation .principle{margin-top:24px;padding:16px 0 30px;border-top:0}
.explanation .principle h2{font-size:23px}
.explanation footer{padding-bottom:0}
@media(max-width:720px){.masthead{height:60px}.intro{padding:28px 0}.canvas-wrap{height:330px;margin-top:14px}.evolution{margin-top:20px}.stage-label>span:last-child{margin-top:0}.explanation{margin-top:26px}}
@media(max-width:400px){.canvas-wrap{height:285px}.intro h1{font-size:29px}}
.stage canvas{width:100%;height:auto;aspect-ratio:17/11;object-fit:contain}
.progression-settings input[type=number]{width:68px}
.progression-settings input[readonly]{color:var(--muted);background:transparent}
@media(max-width:720px){.progression-settings input[type=number]{width:76px}}

.release-footer{display:flex;justify-content:space-between;align-items:center;padding:18px 0 24px;margin-top:20px;font-size:11px}.release-footer a{text-decoration:none;color:var(--muted)}
.clean-link{margin-left:auto;color:var(--muted);font-size:12px;text-decoration:none;padding:12px 0}
.clean-link:hover{color:var(--mint)}
.motif-source{color:var(--muted);font-size:11px;line-height:1.8;margin-top:16px}
.motif-source a{margin-left:8px;text-underline-offset:3px}
body.pure{height:100dvh;min-height:100svh;overflow:hidden;background:var(--bg)}
.pure-main{position:fixed;inset:0;max-width:none;width:100%;height:100%;padding:0;margin:0;display:grid;place-items:center}
.pure .pure-main .canvas-wrap{width:min(100%,1400px);height:min(100%,1000px);margin:0}
.pure #drawing{background-image:none}
.pure-toggle{position:fixed;right:max(24px,env(safe-area-inset-right));bottom:max(24px,env(safe-area-inset-bottom));min-width:64px;min-height:44px;padding:10px 16px;border:1px solid var(--line);border-radius:7px;background:var(--bg);color:var(--muted);font-size:12px}
.pure-toggle:hover{color:var(--ink);border-color:#54705e}
.parameter-panel{position:fixed;inset:16px 16px 16px auto;margin:0;width:min(420px,calc(100vw - 32px));max-width:none;max-height:calc(100dvh - 32px);height:fit-content;overflow:auto;overscroll-behavior:contain;padding:20px;background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:12px}
.parameter-panel::backdrop{background:rgb(5 12 8 / .25)}
.panel-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px;gap:16px}
.panel-header h1{font-size:18px;letter-spacing:0;margin:0;font-weight:500}
.panel-header button{min-height:44px;min-width:52px;padding:8px 10px;color:var(--muted);border:1px solid var(--line);background:transparent;border-radius:5px;font-size:12px}
.pure .sidebar{padding:0;border:0;background:transparent}
.pure .country-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:4px}
.pure .complex-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
.pure .country{padding:8px 1px;gap:5px;min-height:66px}
.pure .country svg{width:46px;height:32px}
.pure .country .name{font-size:11px}
.pure .map-groups{margin-bottom:12px}
.pure .map-groups button{min-height:44px;font-size:11px}
.pure .playback{padding-top:22px;margin-top:16px;border-top:1px solid var(--line)}
.pure .settings{gap:22px;grid-template-columns:1.1fr 1fr}
.pure .range-label{font-size:12px}
.pure .progression-settings{gap:6px 14px}
.pure .progression-settings label,.pure .options label{min-height:40px}
.pure .progression-settings select,.pure .progression-settings input[type=number]{font-size:16px;min-height:38px}
.pure .progression-settings input[type=number]{width:76px}
.pure .options{gap:4px 18px;font-size:11px}
.pure .options input{width:15px;height:15px}
.pure .stages{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.pure .stage{padding:9px}
.pure .evolution{margin-top:20px}
.panel-footer{border-top:1px solid var(--line);display:flex;align-items:center;gap:20px;margin-top:22px;padding-top:16px;color:var(--muted);font-size:11px}
.panel-footer a{text-decoration:none}.panel-footer span{margin-left:auto}
@media(max-width:600px){.parameter-panel{inset:auto 8px max(8px,env(safe-area-inset-bottom)) 8px;width:auto;max-height:82dvh;padding:16px;border-radius:14px}.pure-toggle{right:16px;bottom:max(16px,env(safe-area-inset-bottom))}.pure .primary,.pure .secondary{min-height:42px}.pure .country svg{width:40px}}
@media(prefers-reduced-motion:no-preference){.parameter-panel[open]{animation:panel-in .16s ease-out}@keyframes panel-in{from{transform:translateY(8px)}to{transform:translateY(0)}}}

.panel-header{position:sticky;top:-24px;z-index:2;background:var(--panel);padding:8px 0;border-bottom:1px solid var(--line)}
@media(max-width:600px){.panel-header{top:-16px}}