@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&family=Libre+Caslon+Display&display=swap');
:root{--app-bg:#f6f4ee;--app-surface:#fffefa;--app-text:#263630;--app-muted:#5a665e;--app-line:#dcded4;--app-accent:#235b9f;--app-accent-strong:#19477f;--app-accent-soft:#e8eff8;--app-font:'DM Sans','Avenir Next',system-ui,sans-serif;--serif:'Libre Caslon Display',Georgia,serif;--navy:#192d39;--wood:#d8b581;--grid:#726044;--radius:14px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;background:var(--app-bg);color:var(--app-text);font:14px/1.65 var(--app-font);-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,select{touch-action:manipulation}button{cursor:pointer;color:inherit}button:disabled{cursor:default;opacity:.45}a{color:var(--app-accent);text-underline-offset:4px}button,select{border:1px solid #bbc5ba;background:var(--app-surface);border-radius:7px;padding:10px 14px}button:hover:not(:disabled){background:var(--app-accent-soft);border-color:var(--app-accent)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #2465b7;outline-offset:4px}button.primary{background:var(--app-accent);border-color:var(--app-accent);color:white}button.primary:hover:not(:disabled){background:var(--app-accent-strong)}button.quiet{border-color:transparent;background:transparent}h1,h2,h3,h4,p{margin:0}h1,h2,h3{font-family:var(--serif);font-weight:400;line-height:1.1}h4{font-size:15px;font-weight:600}h3{font-size:29px}.small{font-size:11px;color:var(--app-muted);line-height:1.6}.eyebrow{font-size:9px;font-weight:650;letter-spacing:2px;line-height:1.6}.full{width:100%}button.full{display:flex;justify-content:space-between}.skip-link{position:fixed;top:-100px;left:20px;z-index:100;background:white;padding:12px}.skip-link:focus{top:10px}[hidden]{display:none!important}
.masthead,.app-hero,.view-tabs,main,footer{max-width:1240px;margin-left:auto;margin-right:auto}.masthead{display:flex;align-items:center;justify-content:space-between;padding:28px 0}.brand{display:flex;align-items:center;gap:14px;color:var(--app-text);text-decoration:none;font:31px/1 var(--serif)}.brand-italic{font-style:italic}.brand small{display:block;margin-top:10px;font:7px/1 var(--app-font);letter-spacing:2.3px}.brand-mark{position:relative;width:42px;height:42px;background:linear-gradient(90deg,transparent 49%,#bdc0b1 49%,#bdc0b1 51%,transparent 51%),linear-gradient(transparent 49%,#bdc0b1 49%,#bdc0b1 51%,transparent 51%)}.brand-mark i{position:absolute;width:25px;height:25px;border-radius:50%;background:radial-gradient(circle at 30% 25%,#465050,#182422 70%);left:0;top:0;box-shadow:1px 2px 3px #152b3629}.brand-mark i+i{background:radial-gradient(circle at 30% 25%,#fffefa,#e5e4d9 80%);border:1px solid #b8bbae;left:18px;top:18px}.sister-sites{display:flex;align-items:center;gap:22px}.sister-sites>span{font-size:7px;letter-spacing:1.8px;color:var(--app-muted)}.sister-sites a{text-decoration:none;color:var(--app-text);font-size:11px}.sister-sites a:hover{text-decoration:underline}
.app-hero{position:relative;overflow:hidden;display:grid;grid-template-columns:1.25fr 1fr;min-height:340px;border-radius:16px;background:var(--navy);color:#f8f6e9}.hero-copy{position:relative;z-index:1;padding:38px 48px}.hero-copy>.eyebrow{color:#c1d2d4;font-size:8px;letter-spacing:2.3px}.app-hero h1{font-size:67px;letter-spacing:-1.4px;line-height:.98;margin:18px 0}.app-hero h1 em{font-weight:400;color:#e2d6b6}.lede{color:#d5e0db;font-size:12px;line-height:1.8}.app-meta{display:flex;align-items:center;flex-wrap:wrap;gap:12px;font-size:7px;letter-spacing:1px;color:#c5d1d0;margin-top:27px}.app-meta span+span:before{content:'·';margin-right:12px}.hero-art{position:relative;overflow:hidden;background:radial-gradient(ellipse at 50% 40%,#627e7a42,transparent 70%)}.art-grid{position:absolute;width:460px;height:460px;right:-20px;top:-65px;transform:rotate(-18deg) skewY(9deg);background:repeating-linear-gradient(90deg,transparent 0 58px,#afc4bf29 59px 60px),repeating-linear-gradient(transparent 0 58px,#afc4bf29 59px 60px);mask-image:radial-gradient(ellipse,#000 25%,transparent 72%)}.art-stone{position:absolute;width:109px;height:109px;border-radius:50%;background:radial-gradient(circle at 34% 23%,#525d5c,#202a2b 47%,#0e171b 80%);box-shadow:12px 18px 22px #07111c70,inset 1px 2px 2px #8fa69c55}.art-stone.white{background:radial-gradient(circle at 34% 23%,#fffef3,#e5e2d4 60%,#afb5aa);box-shadow:12px 18px 22px #07111c70,inset 1px 2px 3px #ffffff99}.s1{left:54px;top:22px}.s2{left:166px;top:75px}.s3{left:75px;top:154px}.s4{left:282px;top:137px}.s5{left:199px;top:218px;width:85px;height:85px}.art-ring{position:absolute;width:29px;height:29px;left:258px;top:36px;border:1px solid #c2d5cd;border-radius:50%;box-shadow:0 0 25px #a4c8bd33}.art-label{position:absolute;bottom:24px;right:30px;letter-spacing:2px;font-size:6px;color:#c5d1d0}.view-tabs{display:flex;gap:35px;align-items:center;border-bottom:1px solid var(--app-line);min-height:73px}.view-tabs a{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--app-muted);font-size:13px;padding:24px 1px 20px;border-bottom:3px solid transparent}.view-tabs a span{font-size:8px}.view-tabs a[aria-current=page]{color:var(--app-accent-strong);border-color:var(--app-accent);font-weight:600}.nav-note{margin-left:auto;font-size:10px;color:var(--app-muted)}main{padding:32px 0 48px;min-height:500px}.section-heading{display:flex;justify-content:space-between;align-items:end;margin-bottom:25px}.section-heading h2{font-size:41px;margin-top:7px;letter-spacing:-.4px}.section-heading>p{font-size:11px;color:var(--app-muted);text-align:right}.section-heading .eyebrow{color:var(--app-accent-strong)}.analysis-card{border:1px solid var(--app-line);border-radius:var(--radius);background:var(--app-surface);box-shadow:0 8px 30px #35473504}.game-layout{display:grid;grid-template-columns:minmax(0,1.85fr) minmax(280px,1fr);gap:28px;align-items:start}.game-main,.game-sidebar{min-width:0}.game-sidebar{display:grid;gap:18px}.board-panel{padding:0 28px 17px}.scoreboard{display:flex;align-items:center;gap:20px;padding:19px 0}.player{position:relative;flex:1;display:flex;align-items:center;gap:10px;border:1px solid transparent;border-radius:8px;padding:9px 12px}.player.active{border-color:#a8bed7;background:var(--app-accent-soft)}.player>div>strong{display:block;font:550 12px var(--app-font)}.player>div>span{display:block;font-size:10px;color:var(--app-muted);margin-top:2px}.mini-stone{display:inline-block;flex-shrink:0;width:28px;height:28px;border-radius:50%;box-shadow:1px 2px 3px #20322b24}.mini-stone.black{background:radial-gradient(circle at 32% 25%,#505550,#18211d 70%)}.mini-stone.white{background:radial-gradient(circle at 30% 25%,#fff,#e6e6d9);border:1px solid #aab1a2}.captures{margin-left:auto;text-align:center}.captures b{display:block;font:27px/1 var(--serif)}.captures small{font-size:7px;color:var(--app-muted)}.turn-tag{display:none;position:absolute;top:-7px;right:9px;color:var(--app-accent-strong);font-size:6px;font-weight:650;letter-spacing:1px;background:var(--app-accent-soft);padding:0 5px}.active .turn-tag{display:block}.versus{font:italic 15px var(--serif);color:var(--app-muted)}
.board-scroll{overflow:auto;border-radius:8px;background:linear-gradient(115deg,#dfbf8d,#d7b47f 60%,#dcb985);border:1px solid #ba9768;box-shadow:inset 0 0 40px #a7814620}.board-frame{display:grid;grid-template-columns:20px minmax(0,1fr);grid-template-rows:21px minmax(0,1fr);padding:10px 20px 22px 9px}.size-13{min-width:375px}.size-19{min-width:535px}.axis{display:grid;font-size:9px;font-weight:550;color:#4e432f;align-items:center;text-align:center;user-select:none}.axis-top{grid-column:2;grid-template-columns:repeat(var(--size),1fr)}.axis-left{grid-row:2;grid-template-rows:repeat(var(--size),1fr)}.go-board{grid-row:2;grid-column:2;display:grid;grid-template-columns:repeat(var(--size),minmax(0,1fr));aspect-ratio:1}.point{position:relative;display:grid;place-items:center;aspect-ratio:1;width:100%;min-width:0;border:0;border-radius:0;background:transparent;padding:0;isolation:isolate;touch-action:manipulation}.point::before,.point::after{content:'';position:absolute;background:var(--grid);z-index:-1;pointer-events:none}.point::before{width:100%;height:1px;top:calc(50% - .5px);left:0}.point::after{height:100%;width:1px;left:calc(50% - .5px);top:0}.point.left-edge::before{left:50%;width:50%}.point.right-edge::before{width:50%}.point.top-edge::after{top:50%;height:50%}.point.bottom-edge::after{height:50%}.point:hover:not(:disabled){background:#ffffff25;border:0}.point:focus-visible{outline:2px solid #15447d;outline-offset:-2px;border-radius:4px;z-index:2}.point.star{background-image:radial-gradient(circle at center,#5a4a31 0 2.4px,transparent 2.8px)}.point.star:hover{background-color:#ffffff25;background-image:radial-gradient(circle at center,#5a4a31 0 2.4px,transparent 2.8px)}.stone{position:relative;display:block;width:87%;height:87%;border-radius:50%;box-shadow:1px 3px 3px #46331e4d;pointer-events:none}.stone.black{background:radial-gradient(circle at 30% 22%,#4d514a,#222620 45%,#101911 90%);border:1px solid #1b2119}.stone.white{background:radial-gradient(circle at 32% 22%,#fffef5,#efeddf 55%,#c2bfae 95%);border:1px solid #918975}.stone.last::after{content:'';position:absolute;inset:34%;border:2px solid #fffef0;border-radius:50%}.stone.white.last::after{border-color:#313b35}.stone.dead{opacity:.4}.stone.dead::before{content:'×';position:absolute;inset:0;display:grid;place-items:center;font:700 22px var(--app-font);color:#164175}.point.marked::after,.point.hint::after{background:none;border:2px solid #174678;width:36%;height:36%;left:32%;top:32%;transform:rotate(45deg);z-index:1}.point.marked:has(.stone)::after{border-color:#6daffc}.point.hint{background:#d2e4ff70}.territory{position:absolute;width:22%;height:22%;z-index:1;border:1px solid #2a352e;pointer-events:none}.territory.black{background:#283c31}.territory.white{background:#fffef5}.territory.neutral{width:10%;height:10%;border-radius:50%;background:#75644b;border:0}.board-caption{display:flex;justify-content:space-between;gap:10px;font-size:8px;color:var(--app-muted);padding:13px 0 10px}.board-caption b{font-size:12px}.game-toolbar{display:flex;flex-wrap:wrap;gap:8px;border-top:1px solid var(--app-line);padding-top:14px}.game-toolbar button{font-size:11px;padding:9px 13px}.keyboard-note{font-size:9px;color:var(--app-muted);margin-top:10px}.status-card{padding:23px 25px;background:#eef1e9;border-color:#d5ddcf}.status-card h3{font-size:29px;margin-top:8px}.status-card>p:not(.eyebrow){font-size:11px;margin-top:9px;line-height:1.7}.status-card .storage-status{font-size:8px!important;border-top:1px solid #cad3c5;padding-top:11px;color:#4e6050}.settings{padding:25px}.settings h3{margin:7px 0 17px}.settings label:not(.radio){display:block;font-size:10px;font-weight:600;margin:13px 0 5px}.settings select{width:100%;padding:9px 10px;min-height:41px;font-size:11px}.field-row{display:grid;grid-template-columns:1.15fr 1fr;gap:12px}.field-row>div{min-width:0}.settings fieldset{border:0;padding:0;margin:17px 0}.settings legend{font-size:10px;font-weight:600;margin-bottom:7px}.settings .radio{font-size:11px;display:inline-flex;align-items:center;gap:5px;margin-right:12px}.radio input{accent-color:var(--app-accent)}.settings>.small{font-size:9px;margin-top:13px}.margin-note{padding:2px 15px 7px;display:grid;grid-template-columns:22px 1fr;gap:4px 10px}.margin-note>span{font:29px var(--serif)}.margin-note p{font-size:11px;color:var(--app-muted)}.margin-note strong{color:var(--app-text);font-weight:600}.margin-note a{grid-column:2;font-size:10px;margin-top:6px}.hint-card{padding:22px;background:var(--app-accent-soft);border-color:#becde0}.hint-card p+p{margin-top:8px;font-size:12px}.history-card{padding:22px 25px;margin-top:20px}.card-heading{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.card-heading h3{font-size:26px}.card-heading>.small{margin-left:auto}.card-heading button{font-size:10px;padding:6px 10px}.history-card>p{margin-top:12px}.move-list{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:15px 0 0;padding:0;max-height:180px;overflow:auto}.move-list:empty{margin:0}.move-list button{font-size:10px;display:flex;gap:7px;padding:6px 9px;align-items:center;min-height:34px}.move-list button[aria-current=true]{border-color:var(--app-accent);background:var(--app-accent-soft)}.move-dot{width:9px;height:9px;border-radius:50%;background:#273a2e;border:1px solid #687060}.move-dot.white{background:#f4f4e9}.scoring-card{padding:23px;background:#edf3fa;border-color:#abc0dc}.scoring-card h3{margin:9px 0}.scoring-card>p{font-size:11px;margin-top:9px}.scoring-card button{width:100%;margin-top:9px}.score-lines{display:grid;grid-template-columns:1fr auto;gap:5px;margin:15px 0;font-size:12px}.score-lines strong{font-size:17px}.result-note{font-weight:600;font-size:13px}
.lesson-selector{display:flex;align-items:center;gap:20px;padding:17px 23px;margin-bottom:22px}.lesson-selector label{font-size:11px;font-weight:600}.lesson-selector select{flex:1;max-width:530px;min-width:0}.lesson-selector>.small{margin-left:auto}.lesson-layout{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:45px;align-items:start}.lesson-board-panel{padding:20px}.lesson-controls{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-top:18px}.lesson-controls>span{font-size:10px;color:var(--app-muted)}.lesson-legend{text-align:center;margin-top:10px}.lesson-copy{padding:13px 0}.lesson-copy>.eyebrow{color:var(--app-accent-strong)}.lesson-copy h3{font-size:45px;margin:12px 0 16px}.lesson-intro{font-size:14px;line-height:1.85;color:var(--app-muted)}.lesson-step{margin:25px 0 20px;padding:22px 25px;border-left:3px solid var(--app-accent);background:#e9eef4;border-radius:0 9px 9px 0}.lesson-step .eyebrow{font-size:8px;color:var(--app-accent-strong)}.lesson-step h4{margin:7px 0}.lesson-step>p{font-size:13px;line-height:1.8}.lesson-copy>button{font-size:12px}.lesson-copy>p[role=status]{font-size:12px;color:var(--app-accent-strong);margin:13px 0;min-height:21px}.lesson-copy details{border-top:1px solid var(--app-line);border-bottom:1px solid var(--app-line);padding:16px 0;margin:17px 0}.lesson-copy summary{font-size:12px;cursor:pointer}.lesson-copy details p{font-size:12px;margin-top:12px;color:var(--app-muted)}.lesson-copy>a{font-size:10px}
.fact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:28px}.fact-grid article{padding:25px 28px;background:#eeeee5;border:1px solid #d9decf;border-radius:var(--radius)}.fact-grid strong{display:block;font:39px/1.05 var(--serif);margin:13px 0 15px}.fact-grid p{font-size:12px;color:var(--app-muted);line-height:1.8}.discover-layout{display:grid;grid-template-columns:1.8fr 1fr;gap:25px;align-items:start}.rules-card{padding:32px}.rules-card>h3{font-size:36px;margin:11px 0 28px}.rules-list{list-style:none;margin:0;padding:0}.rules-list li{display:flex;gap:22px;margin-bottom:25px}.rules-list li>span{font:27px var(--serif);color:var(--app-accent)}.rules-list h4{font-size:13px}.rules-list p{font-size:12px;line-height:1.9;color:var(--app-muted);margin-top:6px}.discover-layout>aside{display:grid;gap:22px}.blue-card{padding:35px;background:var(--navy);color:#f9f6e9;border-radius:var(--radius);position:relative;overflow:hidden}.blue-card h3{font-size:55px;margin:18px 0 20px}.blue-card p:not(.eyebrow){font-size:12px;line-height:1.9;color:#d8e0da}.blue-card a{display:inline-block;color:#dae8fe;font-size:11px;margin-top:24px}.privacy-card{padding:28px}.privacy-card h3{margin:10px 0 15px;font-size:31px}.privacy-card p:not(.eyebrow){font-size:11px;color:var(--app-muted);margin-top:10px}.source-strip{display:flex;justify-content:space-between;align-items:center;padding:26px 32px;margin-top:26px;gap:25px}.source-strip h3{font-size:31px;margin:9px 0}.source-strip p:not(.eyebrow){font-size:11px;color:var(--app-muted)}.source-strip>div+div{display:grid;gap:9px;flex-shrink:0;font-size:11px}footer{border-top:1px solid var(--app-line);display:flex;align-items:center;gap:25px;padding:25px 0 35px;color:var(--app-muted)}.footer-brand{font:25px var(--serif);color:var(--app-text);text-decoration:none}footer>span{font-size:9px}footer>span:last-child{margin-left:auto}dialog{border:1px solid var(--app-line);border-radius:15px;padding:30px;background:var(--app-surface);max-width:440px;width:calc(100% - 40px);color:var(--app-text);box-shadow:0 30px 90px #12263250}dialog::backdrop{background:#10273180;backdrop-filter:blur(3px)}dialog h3{margin:12px 0}dialog p:not(.eyebrow){font-size:13px}.dialog-actions{display:flex;justify-content:end;gap:10px;margin-top:25px}
@media(min-width:1500px){.masthead,.app-hero,.view-tabs,main,footer{max-width:1320px}.app-hero{min-height:350px}.hero-copy{padding:43px 50px}.hero-art .s1{left:90px}.hero-art .s2{left:202px}.hero-art .s3{left:111px}.hero-art .s4{left:318px}.hero-art .s5{left:235px}.game-layout{gap:32px;grid-template-columns:1.95fr 1fr}}
@media(max-width:1300px){.masthead,.app-hero,.view-tabs,main,footer{margin-left:35px;margin-right:35px}.hero-copy{padding:35px}.app-hero h1{font-size:61px}.app-meta{font-size:6px}.hero-art{transform:translateX(-10px)}.s4{left:265px}.board-panel{padding-left:20px;padding-right:20px}.game-layout{gap:22px;grid-template-columns:minmax(0,1.8fr) minmax(280px,1fr)}}
@media(max-width:950px){.sister-sites>span{display:none}.hero-copy{padding:32px}.app-hero h1{font-size:53px}.hero-art{transform:scale(.88);transform-origin:center}.app-hero{min-height:310px}.app-meta span:last-child{display:none}.game-layout{grid-template-columns:minmax(0,1.5fr) minmax(265px,1fr);gap:18px}.player{gap:7px;padding:8px}.scoreboard{gap:9px}.turn-tag{font-size:5px}.mini-stone{width:23px;height:23px}.settings,.status-card{padding:20px}.board-panel{padding-left:13px;padding-right:13px}.game-toolbar{gap:5px}.game-toolbar button{padding:8px;font-size:10px}.section-heading h2{font-size:36px}.lesson-layout{gap:25px}.fact-grid article{padding:23px}.fact-grid strong{font-size:33px}}
@media(max-width:760px){.masthead,.app-hero,.view-tabs,main,footer{margin-left:20px;margin-right:20px}.masthead{padding:23px 0}.brand{font-size:26px}.sister-sites{gap:15px}.sister-sites a{font-size:10px}.brand small{font-size:6px}.app-hero{grid-template-columns:1.4fr 1fr;min-height:295px}.hero-copy{padding:30px}.app-hero h1{font-size:51px}.hero-copy>.eyebrow{font-size:6px}.lede{font-size:10px}.hero-art{transform:scale(.76);transform-origin:0 35%}.art-label{display:none}.app-meta{font-size:6px;gap:7px}.app-meta span+span:before{margin-right:7px}.view-tabs{min-height:65px;gap:27px}.view-tabs a{padding:20px 0 16px}.nav-note{font-size:8px}.game-layout{grid-template-columns:1fr}.game-sidebar{grid-template-columns:1fr 1fr;gap:18px}.settings{grid-column:2;grid-row:1 / span 3}.margin-note,.hint-card,.scoring-card{grid-column:1}.board-panel{padding:0 25px 18px}.scoreboard{gap:22px}.player{padding:12px;gap:12px}.mini-stone{width:29px;height:29px}.game-toolbar button{padding:9px 14px;font-size:12px}.turn-tag{font-size:7px}.lesson-layout{grid-template-columns:1fr}.lesson-copy{padding:5px}.lesson-board-panel{max-width:590px;width:100%;margin:auto}.lesson-selector{gap:10px}.lesson-selector>.small{display:none}.discover-layout{grid-template-columns:1fr}.discover-layout>aside{grid-template-columns:1fr 1fr}.blue-card{padding:29px}.blue-card h3{font-size:45px}.fact-grid{gap:12px}.fact-grid article{padding:20px 16px}.fact-grid strong{font-size:30px}.fact-grid p{font-size:10px}.source-strip{flex-wrap:wrap}footer>span:nth-child(2){display:none}}
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.settings>.full{margin-top:16px}.app-meta{font-size:8px}.app-meta span:last-child{display:inline}
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