:root{color-scheme:light;font-family:"SF Pro Display","PingFang SC","Hiragino Sans GB",system-ui,sans-serif;--paper:#f3f0e7;--paper-2:#e8e2d5;--card:#faf8f2;--ink:#20211e;--muted:#716f68;--line:rgba(32,33,30,.14);--red:#c94f36;--red-dark:#a83d29;--green:#386b57;--night:#1b211d;--cream:#f7f2e7;--shadow:0 22px 60px rgba(53,45,31,.09);color:var(--ink);background:var(--paper)}
:root[data-theme="dark"]{color-scheme:dark;--paper:#111411;--paper-2:#1b211d;--card:#181c18;--ink:#f2eee4;--muted:#aaa79e;--line:rgba(255,255,255,.13);--red:#e37255;--red-dark:#ef896d;--green:#76b79a;--night:#090c0a;--cream:#f3eee4;--shadow:0 24px 70px rgba(0,0,0,.28)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:88px}body{margin:0;min-width:320px;min-height:100vh;background:var(--paper);color:var(--ink)}button,input{font:inherit}a{color:inherit}button,a{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid var(--red);outline-offset:3px}
.topbar{position:sticky;z-index:30;top:0;height:76px;max-width:1380px;margin:auto;padding:0 34px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:22px;background:color-mix(in srgb,var(--paper) 87%,transparent);backdrop-filter:blur(20px) saturate(150%)}
.brand{width:max-content;display:flex;align-items:center;gap:11px;text-decoration:none}.brand>span:last-child{display:grid}.brand strong{font-size:17px;letter-spacing:.08em}.brand small{margin-top:2px;color:var(--muted);font-size:8px;letter-spacing:.17em}.brand-mark{position:relative;width:36px;height:36px}.brand-mark:before,.brand-mark:after{content:"";position:absolute;width:20px;height:28px;border:1.5px solid currentColor;border-radius:5px;background:var(--card);box-shadow:0 4px 10px rgba(0,0,0,.08)}.brand-mark:before{left:2px;top:4px;transform:rotate(-9deg)}.brand-mark:after{right:1px;top:2px;transform:rotate(8deg)}.brand-mark i,.brand-mark b{position:absolute;z-index:2;border-radius:50%}.brand-mark i{width:7px;height:7px;left:9px;top:14px;background:var(--red)}.brand-mark b{width:6px;height:6px;right:8px;top:12px;background:var(--green)}
.desktop-nav{display:flex;gap:3px;padding:4px;border:1px solid var(--line);border-radius:999px;background:color-mix(in srgb,var(--card) 72%,transparent)}.desktop-nav a{padding:8px 12px;border-radius:999px;color:var(--muted);text-decoration:none;font-size:11px;font-weight:700}.desktop-nav a:hover,.desktop-nav a.active{color:var(--ink);background:var(--paper-2)}.theme-toggle{justify-self:end;display:flex;align-items:center;gap:7px;min-height:36px;padding:0 12px;border:1px solid var(--line);border-radius:999px;background:var(--card);color:var(--muted);cursor:pointer}.theme-toggle b{font-size:10px}.theme-toggle span{font-size:16px}
main{max-width:1380px;margin:auto;padding:0 34px 80px}.eyebrow,.section-kicker{margin:0;color:var(--red-dark);font:800 9px/1.2 ui-monospace,"SFMono-Regular",monospace;letter-spacing:.15em;text-transform:uppercase}
.hero{min-height:600px;padding:clamp(42px,6vw,84px);display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(36px,7vw,96px);align-items:center;border-radius:34px;background:var(--night);color:var(--cream);box-shadow:var(--shadow);overflow:hidden;position:relative}.hero:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 82% 18%,rgba(201,79,54,.2),transparent 30%),linear-gradient(125deg,transparent 50%,rgba(255,255,255,.025))}.hero>*{position:relative}.hero h1{max-width:760px;margin:22px 0;font-size:clamp(54px,6vw,88px);line-height:.98;letter-spacing:-.07em;font-weight:650}.hero h1 em{display:block;color:#e17658;font-style:normal;font-weight:480}.hero-lead{max-width:590px;margin:0;color:rgba(247,242,231,.68);font-size:16px;line-height:1.9}.hero-actions{margin-top:32px;display:flex;align-items:center;gap:20px;flex-wrap:wrap}.primary-button{min-height:50px;padding:0 20px;display:inline-flex;align-items:center;gap:22px;border-radius:14px;background:var(--cream);color:#171a17;text-decoration:none;font-size:12px;font-weight:850}.primary-button span{color:var(--red);font-size:17px}.text-link{color:rgba(247,242,231,.68);font-size:11px;text-underline-offset:4px}.hero-facts{margin:36px 0 0;padding:0;display:flex;gap:22px;list-style:none;color:rgba(247,242,231,.48);font-size:10px}.hero-facts li:before{content:"";display:inline-block;width:5px;height:5px;margin-right:7px;border-radius:50%;background:#72af8f}
.starter-card{min-width:0;padding:30px;border:1px solid rgba(255,255,255,.13);border-radius:28px;background:rgba(255,255,255,.055);backdrop-filter:blur(8px)}.starter-head{display:flex;justify-content:space-between;color:rgba(247,242,231,.52);font-size:9px;font-weight:700;letter-spacing:.09em}.starter-head span{color:#82c09f}.lesson-number{margin:28px 0 4px;color:rgba(255,255,255,.1);font:400 78px/1 ui-monospace,monospace}.starter-card h2{margin:0;font-size:32px;letter-spacing:-.045em}.starter-card>p:not(.lesson-number){color:rgba(247,242,231,.62);font-size:12px;line-height:1.7}.starter-hand{margin:24px 0;display:flex;gap:3px;overflow:hidden}.starter-hand .tile{width:34px;height:48px}.starter-card>a{display:flex;justify-content:space-between;padding-top:18px;border-top:1px solid rgba(255,255,255,.13);color:var(--cream);text-decoration:none;font-size:11px;font-weight:750}
.learning-map{padding:110px 0 36px;display:grid;grid-template-columns:minmax(260px,.72fr) 1.28fr;gap:clamp(42px,8vw,120px)}.map-intro{position:sticky;top:110px;align-self:start}.map-intro h2{margin:10px 0 20px;font-size:clamp(38px,4.6vw,62px);line-height:1;letter-spacing:-.06em}.map-intro>p:last-child{max-width:390px;color:var(--muted);font-size:13px;line-height:1.8}.path-list{margin:0;padding:0;list-style:none;border-top:1px solid var(--line)}.path-list li{border-bottom:1px solid var(--line)}.path-list a{min-height:140px;padding:24px 6px;display:grid;grid-template-columns:52px 1fr auto;gap:18px;align-items:center;text-decoration:none}.path-list a>span{width:42px;height:42px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;color:var(--muted);font:800 10px ui-monospace,monospace}.path-list small{display:block;margin-bottom:6px;color:var(--muted);font-size:9px}.path-list strong{font-size:22px;letter-spacing:-.035em}.path-list p{margin:7px 0 0;color:var(--muted);font-size:11px;line-height:1.5}.path-list i{font-style:normal;color:var(--muted)}.path-list li.is-current a>span{background:var(--red);border-color:var(--red);color:#fff}.path-list li.is-current small{color:var(--red-dark)}.path-list a:hover strong{color:var(--red-dark)}
.chapter{padding:118px 0 24px}.chapter-header{display:grid;grid-template-columns:86px minmax(0,880px);gap:28px;margin-bottom:42px}.chapter-index{width:76px;height:76px;display:grid;place-items:center;border:1px solid var(--line);border-radius:20px;color:var(--red-dark);font:800 15px ui-monospace,monospace}.chapter-header h2{margin:9px 0 16px;font-size:clamp(40px,5.3vw,70px);line-height:1;letter-spacing:-.065em}.chapter-header>div>p:last-child{max-width:680px;margin:0;color:var(--muted);font-size:14px;line-height:1.8}.chapter-header.compact{grid-template-columns:76px minmax(0,780px)}.chapter-header.compact .chapter-index{width:64px;height:64px;border-radius:18px}.chapter-header.compact h2{font-size:clamp(38px,4.6vw,60px)}
.suit-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.suit-card{min-width:0;min-height:250px;padding:28px;display:grid;grid-template-columns:200px 1fr;gap:24px;align-items:center;border:1px solid var(--line);border-radius:26px;background:var(--card)}.suit-card>div>span{color:var(--red-dark);font:800 9px ui-monospace,monospace;letter-spacing:.12em}.suit-card h3{margin:7px 0 8px;font-size:27px}.suit-card p{margin:0;color:var(--muted);font-size:11px;line-height:1.7}.lesson-tiles{display:flex;gap:2px;overflow-x:auto;padding:8px 2px;scrollbar-width:none}.lesson-tiles::-webkit-scrollbar{display:none}.lesson-tiles .tile{width:34px;height:48px}.honor-card{grid-column:1/-1;grid-template-columns:280px 1fr}.honor-card>div:last-child{display:grid;gap:8px}
.tile{width:32px;height:45px;flex:0 0 auto;display:block;object-fit:contain;filter:drop-shadow(0 4px 4px rgba(25,21,15,.13));transition:transform .2s ease;user-select:none}.tile:hover{transform:translateY(-3px)}
.verb-panel{margin-top:16px;padding:38px;display:grid;grid-template-columns:270px 1fr;gap:56px;border-radius:28px;background:var(--night);color:var(--cream)}.verb-intro h3{margin:10px 0 14px;font-size:32px;letter-spacing:-.045em}.verb-intro>p:last-child{color:rgba(247,242,231,.58);font-size:11px;line-height:1.7}.verb-list{display:grid;grid-template-columns:1fr 1fr}.verb-list dl{margin:0;padding:16px 0;display:grid;grid-template-columns:56px 1fr;gap:14px;border-bottom:1px solid rgba(255,255,255,.12)}.verb-list dl:nth-last-child(-n+2){border-bottom:0}.verb-list dt{color:#ec8266;font-size:17px;font-weight:850}.verb-list dd{margin:0;color:rgba(247,242,231,.68);font-size:11px;line-height:1.6}
.glossary-box{margin-top:16px;padding:38px;display:grid;grid-template-columns:300px 1fr;gap:54px;border:1px solid var(--line);border-radius:28px;background:var(--card)}.glossary-box h3{margin:9px 0 13px;font-size:30px;letter-spacing:-.045em}.glossary-box>div:first-child>p:last-child{color:var(--muted);font-size:11px;line-height:1.7}.glossary-search{height:48px;padding:0 15px;display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:14px;background:var(--paper)}.glossary-search span{color:var(--muted)}.glossary-search input{width:100%;border:0;outline:0;background:transparent;color:var(--ink)}.glossary-list{max-height:360px;margin-top:10px;overflow:auto}.glossary-row{margin:0;padding:15px 4px;display:grid;grid-template-columns:130px 1fr;gap:22px;border-bottom:1px solid var(--line)}.glossary-row dt{font-weight:800}.glossary-row dd{margin:0;color:var(--muted);font-size:11px;line-height:1.65}
.turn-flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:14px;align-items:center}.turn-flow article{min-height:190px;padding:26px;display:grid;grid-template-columns:40px 1fr;gap:16px;border:1px solid var(--line);border-radius:24px;background:var(--card)}.turn-flow article>span{width:38px;height:38px;display:grid;place-items:center;border-radius:12px;background:var(--ink);color:var(--paper);font:800 11px ui-monospace,monospace}.turn-flow small{color:var(--red-dark);font-size:9px}.turn-flow h3{margin:7px 0 12px;font-size:23px}.turn-flow p{margin:0;color:var(--muted);font-size:11px;line-height:1.7}.turn-flow>i{color:var(--muted);font-style:normal}.rule-note,.warning-callout{margin-top:16px;padding:20px 24px;border-left:3px solid var(--red);border-radius:12px;background:color-mix(in srgb,var(--red) 6%,var(--card))}.rule-note strong,.warning-callout strong{font-size:13px}.rule-note p,.warning-callout p{margin:5px 0 0;color:var(--muted);font-size:11px;line-height:1.65}
.gate-flow{display:grid;grid-template-columns:1fr auto 1fr auto;gap:14px;align-items:center}.gate-flow article{min-height:210px;padding:28px;border:1px solid var(--line);border-radius:26px;background:var(--card)}.gate-flow article.accent{border-color:color-mix(in srgb,var(--red) 36%,var(--line));background:color-mix(in srgb,var(--red) 7%,var(--card))}.gate-flow article>span{color:var(--red-dark);font:800 9px ui-monospace,monospace;letter-spacing:.12em}.gate-flow h3{margin:12px 0;font-size:28px}.gate-flow p{margin:0;color:var(--muted);font-size:12px;line-height:1.75}.gate-flow strong{color:var(--ink)}.gate-flow>i{color:var(--muted);font-style:normal;font-size:22px}.gate-flow>b{padding:14px 18px;border-radius:999px;background:var(--green);color:#fff;font-size:11px;white-space:nowrap}.structure-grid{margin-top:16px;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.structure-grid>article{min-width:0;padding:24px;border:1px solid var(--line);border-radius:24px;background:var(--card)}.structure-grid header{display:flex;gap:13px;align-items:center}.structure-grid header>span{width:38px;height:38px;display:grid;place-items:center;border:1px solid var(--line);border-radius:12px;color:var(--red-dark);font-size:11px;font-weight:800}.structure-grid small{color:var(--muted);font-size:9px}.structure-grid h3{margin:3px 0 0;font-size:20px}.structure-grid>article>p{margin:17px 0 0;color:var(--muted);font-size:11px;line-height:1.65}.hand-groups{min-height:116px;margin-top:22px;display:flex;flex-wrap:wrap;align-content:flex-start;gap:8px 3px}.group{display:flex;gap:2px;margin-right:4px}
.filter-bar{position:sticky;z-index:15;top:84px;padding:8px;display:grid;grid-template-columns:minmax(280px,1fr) auto;gap:10px;border-radius:18px;background:color-mix(in srgb,var(--paper) 82%,transparent);backdrop-filter:blur(18px)}.search-pill{height:50px;padding:0 16px;display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:14px;background:var(--card)}.search-pill input{width:100%;min-width:0;border:0;outline:0;background:transparent;color:var(--ink)}.search-pill kbd{padding:4px 7px;border:1px solid var(--line);border-radius:7px;color:var(--muted);font-size:9px}.filter-chips{display:flex;gap:4px;padding:4px;border:1px solid var(--line);border-radius:14px;background:var(--card)}.filter-chips button{min-width:62px;border:0;border-radius:10px;background:transparent;color:var(--muted);font-size:10px;font-weight:750;cursor:pointer}.filter-chips button.active{background:var(--ink);color:var(--paper)}.results-line{margin:17px 4px;display:flex;justify-content:space-between;color:var(--muted);font:700 9px ui-monospace,monospace}.yaku-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.yaku-card{min-width:0;padding:22px;border:1px solid var(--line);border-radius:22px;background:var(--card);cursor:pointer;transition:.2s ease}.yaku-card:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--red) 30%,var(--line));box-shadow:0 12px 30px rgba(45,38,26,.07)}.yaku-top{display:grid;grid-template-columns:1fr auto;gap:12px}.yaku-title{display:flex;align-items:center;gap:11px}.yaku-index{width:34px;height:34px;display:grid;place-items:center;border:1px solid var(--line);border-radius:11px;color:var(--muted);font:700 9px ui-monospace,monospace}.yaku-title h3{margin:0;font-size:19px}.yaku-title small{display:block;margin-top:2px;color:var(--muted);font-size:9px}.han-badge{height:max-content;padding:7px 10px;border-radius:999px;background:var(--ink);color:var(--paper);font-size:9px;font-weight:800}.yaku-tags{margin:14px 0 12px;display:flex;gap:5px;flex-wrap:wrap}.yaku-tags span{padding:4px 7px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:8px}.yaku-card .tiles{display:flex;gap:2px;overflow-x:auto;padding:2px 0 5px;scrollbar-width:none}.yaku-card .tiles::-webkit-scrollbar{display:none}.yaku-card .tile{width:30px;height:42px}.yaku-summary{margin:13px 0 0;color:var(--muted);font-size:11px;line-height:1.65}.yaku-detail{display:grid;grid-template-rows:0fr;opacity:0;transition:.25s ease}.yaku-detail>div{overflow:hidden}.yaku-card[aria-expanded="true"] .yaku-detail{grid-template-rows:1fr;opacity:1}.yaku-rule{margin:14px 0 0;padding-top:13px;border-top:1px solid var(--line);font-size:10px;line-height:1.6}.yaku-rule b{margin-right:5px;color:var(--red-dark)}.empty-state{text-align:center;color:var(--muted)}.rule-variation{margin-top:16px;padding:26px;display:grid;grid-template-columns:260px 1fr;gap:40px;border-radius:24px;background:var(--night);color:var(--cream)}.rule-variation h3{margin:8px 0 0;font-size:23px}.rule-variation>p{margin:0;color:rgba(247,242,231,.62);font-size:11px;line-height:1.75}
.practice-stage{padding:48px;display:grid;grid-template-columns:.85fr 1.15fr;gap:60px;align-items:center;border-radius:28px;background:var(--night);color:var(--cream)}.practice-intro h2{margin:10px 0 17px;font-size:clamp(40px,5vw,62px);line-height:1;letter-spacing:-.06em}.practice-intro>p:not(.section-kicker){color:rgba(247,242,231,.6);font-size:12px;line-height:1.7}.practice-progress{margin-top:30px}.practice-progress span{font:700 9px ui-monospace,monospace;color:rgba(255,255,255,.55)}.practice-progress>div{height:3px;margin-top:8px;background:rgba(255,255,255,.12)}.practice-progress i{display:block;height:100%;width:33%;background:var(--red)}.quiz-card{min-height:330px;padding:28px;border:1px solid rgba(255,255,255,.13);border-radius:22px;background:rgba(255,255,255,.05)}.quiz-number{color:#ec8266;font:800 9px ui-monospace,monospace}.quiz-card h3{margin:15px 0 22px;font-size:21px;line-height:1.45}.quiz-options{display:grid;gap:8px}.quiz-options button{min-height:47px;padding:10px 14px;border:1px solid rgba(255,255,255,.13);border-radius:12px;background:rgba(255,255,255,.04);color:rgba(255,255,255,.78);text-align:left;font-size:11px;cursor:pointer}.quiz-options button.correct{border-color:#72af8f;background:rgba(114,175,143,.13)}.quiz-options button.wrong{border-color:#e17658;background:rgba(225,118,88,.13)}.quiz-feedback{color:rgba(255,255,255,.64);font-size:11px;line-height:1.6}.quiz-next{min-height:38px;padding:0 14px;border:0;border-radius:999px;background:var(--cream);color:#171a17;font-size:10px;font-weight:800;cursor:pointer}
.sources{padding:100px 0 20px;display:grid;grid-template-columns:300px 1fr;gap:48px}.sources h2{margin:9px 0;font-size:38px;letter-spacing:-.05em}.source-links{display:grid;gap:7px}.source-links a{min-height:62px;padding:13px 16px;display:grid;grid-template-columns:50px 1fr auto;align-items:center;gap:10px;border:1px solid var(--line);border-radius:15px;background:var(--card);text-decoration:none}.source-links span{color:var(--red-dark);font:800 9px ui-monospace,monospace}.source-links b{font-size:11px}.source-links i{color:var(--muted);font-style:normal}.scope-copy{grid-column:2;margin:0;color:var(--muted);font-size:10px}footer{max-width:1380px;margin:auto;padding:28px 34px 38px;display:flex;justify-content:space-between;border-top:1px solid var(--line);color:var(--muted);font:700 9px ui-monospace,monospace;letter-spacing:.1em}.mobile-nav{display:none}
@media(max-width:1020px){.hero{grid-template-columns:1fr}.starter-card{max-width:660px}.learning-map{grid-template-columns:1fr}.map-intro{position:static}.suit-card{grid-template-columns:160px 1fr}.verb-panel,.glossary-box{grid-template-columns:1fr}.structure-grid{grid-template-columns:1fr 1fr}.structure-grid>article:last-child{grid-column:1/-1}.filter-bar{grid-template-columns:1fr}.filter-chips{width:max-content;max-width:100%;overflow:auto}.sources{grid-template-columns:1fr}.scope-copy{grid-column:auto}}
@media(max-width:720px){html{scroll-padding-top:74px}body{padding-bottom:78px}.topbar{height:66px;padding:0 15px;grid-template-columns:1fr auto}.desktop-nav{display:none}.theme-toggle{width:36px;padding:0;justify-content:center}.theme-toggle b{display:none}main{padding:0 13px 50px}.hero{min-height:0;padding:40px 22px 22px;gap:36px;border-radius:24px}.hero h1{font-size:clamp(46px,14vw,64px)}.hero-lead{font-size:14px}.hero-actions{align-items:flex-start;flex-direction:column;gap:14px}.hero-facts{gap:12px;flex-wrap:wrap}.starter-card{padding:22px;border-radius:20px}.lesson-number{font-size:58px}.starter-card h2{font-size:27px}.starter-hand .tile{width:30px;height:42px}.learning-map{padding-top:78px;gap:28px}.map-intro h2{font-size:43px}.path-list a{min-height:120px;grid-template-columns:44px 1fr auto;gap:12px}.path-list a>span{width:38px;height:38px}.path-list strong{font-size:19px}.chapter{padding-top:90px}.chapter-header,.chapter-header.compact{grid-template-columns:52px 1fr;gap:14px;margin-bottom:28px}.chapter-index,.chapter-header.compact .chapter-index{width:48px;height:48px;border-radius:14px}.chapter-header h2,.chapter-header.compact h2{font-size:39px}.suit-grid{grid-template-columns:1fr}.suit-card,.honor-card{grid-column:auto;grid-template-columns:1fr;gap:18px;padding:21px;min-height:0}.lesson-tiles .tile{width:32px;height:45px}.verb-panel,.glossary-box{padding:24px;gap:24px}.verb-list{grid-template-columns:1fr}.verb-list dl:nth-last-child(2){border-bottom:1px solid rgba(255,255,255,.12)}.glossary-row{grid-template-columns:100px 1fr}.turn-flow{grid-template-columns:1fr}.turn-flow>i{transform:rotate(90deg);justify-self:center}.turn-flow article{min-height:0}.gate-flow{grid-template-columns:1fr}.gate-flow>i{justify-self:center}.gate-flow>b{justify-self:start}.gate-flow article{min-height:0}.structure-grid{grid-template-columns:1fr}.structure-grid>article:last-child{grid-column:auto}.filter-bar{top:70px;padding:5px}.search-pill{height:48px}.search-pill kbd{display:none}.filter-chips{width:100%}.filter-chips button{min-width:68px;height:40px}.yaku-grid{grid-template-columns:1fr}.yaku-card{padding:19px}.rule-variation{grid-template-columns:1fr;gap:16px}.practice-stage{padding:27px 20px;grid-template-columns:1fr;gap:28px}.quiz-card{min-height:0;padding:21px}.sources{padding-top:76px;gap:24px}.source-links a{grid-template-columns:42px 1fr auto}footer{padding:25px 17px 30px;flex-direction:column;gap:7px}.mobile-nav{position:fixed;z-index:35;left:13px;right:13px;bottom:12px;height:60px;padding:5px;display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:18px;background:color-mix(in srgb,var(--paper) 78%,transparent);backdrop-filter:blur(24px);box-shadow:0 13px 35px rgba(0,0,0,.18)}.mobile-nav a{display:grid;place-content:center;gap:2px;border-radius:13px;color:var(--muted);text-decoration:none;text-align:center}.mobile-nav i{font-style:normal;font-size:9px}.mobile-nav span{font-size:9px;font-weight:800}.mobile-nav a.active{background:var(--ink);color:var(--paper)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

/* Multi-page course shell */
.crumb{padding-top:34px;display:flex;align-items:center;gap:9px;color:var(--muted);font-size:10px}.crumb a{color:var(--muted);text-underline-offset:3px}.crumb b{color:var(--ink)}
.chapter-header h1{margin:9px 0 16px;font-size:clamp(40px,5.3vw,70px);line-height:1;letter-spacing:-.065em}.chapter-header.compact h1{font-size:clamp(38px,4.6vw,60px)}.chapter-header>div>p:last-child{max-width:680px;margin:0;color:var(--muted);font-size:14px;line-height:1.8}
.next-lesson{max-width:520px;margin:42px 0 0 auto;padding:20px 22px;display:flex;justify-content:space-between;align-items:center;border:1px solid var(--line);border-radius:18px;background:var(--card);color:var(--ink);font-size:12px;font-weight:800;text-decoration:none}.next-lesson:hover{border-color:color-mix(in srgb,var(--red) 35%,var(--line));color:var(--red-dark)}footer a{color:var(--muted);text-underline-offset:3px}

/* Every artwork sits on a physical white tile, including dark mode. */
.tile{width:32px;height:45px;box-sizing:border-box;flex:0 0 auto;display:block;object-fit:contain;padding:3px 2px;background:#fff;border:1px solid #d7d3c9;border-radius:4px;filter:none;box-shadow:0 2px 0 #c8c3b8,0 4px 8px rgba(25,21,15,.12);transition:transform .2s ease;user-select:none}

@media(max-width:720px){
  body{padding-bottom:calc(78px + env(safe-area-inset-bottom))}
  .chapter-header h1,.chapter-header.compact h1{font-size:39px}
  .crumb{padding-top:22px}
  .next-lesson{margin-top:30px}
  .mobile-nav{left:0;right:0;bottom:0;height:calc(60px + env(safe-area-inset-bottom));box-sizing:border-box;padding:5px 13px calc(5px + env(safe-area-inset-bottom));grid-template-columns:repeat(5,1fr);border:1px solid var(--line);border-bottom:0;border-radius:18px 18px 0 0;background:var(--paper);backdrop-filter:none;box-shadow:none}
  .mobile-nav span{font-size:8px}
}

/* The homepage sample hand must remain fully visible in every pointer state. */
.starter-hand{min-height:60px;padding:5px 2px 8px;align-items:flex-start;overflow:visible}
.starter-hand .tile:hover,.starter-hand .tile:active,.starter-hand .tile:focus{transform:none}

/* Guided beginner lessons */
.beginner-block{margin-top:76px;padding-top:42px;border-top:1px solid var(--line)}
.beginner-block:first-of-type{margin-top:0}.lesson-heading{margin-bottom:28px;display:grid;grid-template-columns:82px minmax(0,760px);gap:24px}.lesson-heading>span{width:72px;height:34px;display:grid;place-items:center;border-radius:999px;background:var(--ink);color:var(--paper);font:800 9px ui-monospace,monospace}.lesson-heading h2{margin:0 0 12px;font-size:clamp(30px,4vw,50px);line-height:1.05;letter-spacing:-.05em}.lesson-heading p{margin:0;color:var(--muted);font-size:13px;line-height:1.8}
.hand-story,.turn-demo{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:12px;align-items:center}.hand-story article,.turn-demo article{min-width:0;padding:22px;border:1px solid var(--line);border-radius:22px;background:var(--card)}.hand-story small,.turn-demo small{color:var(--red-dark);font-size:9px;font-weight:800}.hand-story article>p,.turn-demo article>p{margin:10px 0 0;color:var(--muted);font-size:10px;line-height:1.6}.hand-story>i,.turn-demo>i{color:var(--muted);font-style:normal;font-size:10px;font-weight:800}.wide-tiles{display:flex;gap:2px;padding:10px 2px 12px;overflow-x:auto;scrollbar-width:none}.wide-tiles::-webkit-scrollbar{display:none}.wide-tiles .tile{width:28px;height:40px}
.plain-note,.mistake-note{margin-top:14px;padding:19px 22px;border-radius:16px;background:color-mix(in srgb,var(--green) 7%,var(--card));border:1px solid color-mix(in srgb,var(--green) 20%,var(--line))}.mistake-note{background:color-mix(in srgb,var(--red) 6%,var(--card));border-color:color-mix(in srgb,var(--red) 22%,var(--line))}.plain-note strong,.mistake-note strong{font-size:12px}.plain-note p,.mistake-note p{margin:6px 0 0;color:var(--muted);font-size:11px;line-height:1.7}
.combo-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.combo-grid article{padding:24px;border:1px solid var(--line);border-radius:22px;background:var(--card)}.combo-grid article.is-wrong{border-style:dashed}.combo-grid article>span{color:var(--red-dark);font-size:9px;font-weight:800}.combo-grid h3{margin:8px 0 14px;font-size:24px}.combo-grid p{margin:15px 0 0;color:var(--muted);font-size:11px;line-height:1.65}.example-tiles,.before-after>div>div,.starter-yaku-grid a>div{display:flex;gap:3px;padding:5px 0 8px}.example-tiles .tile{width:42px;height:59px}
.call-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}.call-grid article{min-width:0;padding:24px;border:1px solid var(--line);border-radius:22px;background:var(--card)}.call-grid header span{color:var(--red-dark);font-size:9px;font-weight:800}.call-grid h3{margin:7px 0 18px;font-size:28px}.call-grid p{color:var(--muted);font-size:11px;line-height:1.7}.call-grid em{display:block;padding-top:12px;border-top:1px solid var(--line);color:var(--muted);font-size:9px;font-style:normal;line-height:1.6}.before-after{display:grid;grid-template-columns:1fr auto 1fr;gap:8px;align-items:center}.before-after small{color:var(--muted);font-size:8px}.before-after i{color:var(--muted);font-size:8px;font-style:normal}.before-after .tile{width:35px;height:49px}
.state-compare,.term-steps,.checkpoint-grid,.wrong-right{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.term-steps,.checkpoint-grid{grid-template-columns:repeat(3,1fr)}.state-compare article,.term-steps article,.checkpoint-grid article,.wrong-right article{padding:26px;border:1px solid var(--line);border-radius:22px;background:var(--card)}.state-compare span,.term-steps span,.checkpoint-grid span,.wrong-right span{color:var(--red-dark);font-size:9px;font-weight:800}.state-compare h3,.term-steps h3,.checkpoint-grid h3,.wrong-right h3{margin:9px 0 12px;font-size:24px}.state-compare p,.term-steps p,.checkpoint-grid p,.wrong-right p{margin:0;color:var(--muted);font-size:11px;line-height:1.7}.state-compare strong{display:block;margin-top:16px;font-size:10px;line-height:1.6}.wrong-right .right{border-color:color-mix(in srgb,var(--green) 34%,var(--line));background:color-mix(in srgb,var(--green) 6%,var(--card))}
.wait-demo{padding:25px;display:grid;grid-template-columns:1fr auto 1fr;gap:14px;align-items:center;border:1px solid var(--line);border-radius:22px;background:var(--card)}.wait-demo small{color:var(--red-dark);font-size:9px;font-weight:800}.wait-demo>i{font-style:normal;font-weight:850}.term-steps{margin-top:14px}
.anatomy-card{padding:28px;border:1px solid var(--line);border-radius:24px;background:var(--card)}.large-hand{min-height:0;margin:0}.large-hand .tile{width:38px;height:54px}.anatomy-card ol{margin:22px 0 0;padding:18px 0 0;display:grid;grid-template-columns:repeat(5,1fr);gap:8px;border-top:1px solid var(--line);list-style:none}.anatomy-card li{display:grid;gap:4px}.anatomy-card li b{font-size:10px}.anatomy-card li span{color:var(--muted);font-size:9px}
.starter-yaku-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.starter-yaku-grid a{min-width:0;padding:24px;border:1px solid var(--line);border-radius:22px;background:var(--card);color:var(--ink);text-decoration:none}.starter-yaku-grid a>span{color:var(--red-dark);font-size:9px;font-weight:800}.starter-yaku-grid h3{margin:8px 0;font-size:25px}.starter-yaku-grid a>div{max-width:100%;overflow-x:auto;scrollbar-width:none}.starter-yaku-grid .tile{width:29px;height:41px}.starter-yaku-grid p{color:var(--muted);font-size:11px;line-height:1.7}.starter-yaku-grid em{display:block;padding-top:12px;border-top:1px solid var(--line);color:var(--muted);font-size:9px;font-style:normal;line-height:1.6}
.final-checklist{margin:0;padding:0;display:grid;gap:8px;list-style:none}.final-checklist li{padding:18px 20px;display:grid;grid-template-columns:38px 1fr;gap:14px;align-items:center;border:1px solid var(--line);border-radius:16px;background:var(--card)}.final-checklist li>span{width:34px;height:34px;display:grid;place-items:center;border-radius:11px;background:var(--ink);color:var(--paper);font-size:10px;font-weight:800}.final-checklist b{font-size:12px}.final-checklist p{margin:5px 0 0;color:var(--muted);font-size:10px;line-height:1.6}
.quiz-feedback{display:grid;gap:7px}.quiz-feedback strong{color:#f2ae98}.quiz-feedback span{display:block}.quiz-reasoning{margin:4px 0 0;padding-left:18px;display:grid;gap:5px}.quiz-reasoning li{padding-left:2px}
.yaku-card{scroll-margin-top:110px}

@media(max-width:900px){.combo-grid,.call-grid{grid-template-columns:1fr 1fr}.hand-story,.turn-demo{grid-template-columns:1fr}.hand-story>i,.turn-demo>i{justify-self:center}.anatomy-card ol{grid-template-columns:repeat(3,1fr)}}
@media(max-width:720px){
  .starter-hand{min-height:55px;padding-top:5px;padding-bottom:8px;overflow:visible}
  .beginner-block{margin-top:56px;padding-top:32px}.lesson-heading{grid-template-columns:1fr;gap:12px}.lesson-heading h2{font-size:34px}.lesson-heading>span{width:66px}
  .combo-grid,.call-grid,.state-compare,.term-steps,.checkpoint-grid,.wrong-right,.starter-yaku-grid{grid-template-columns:1fr}
  .before-after{grid-template-columns:1fr}.before-after i{padding:3px 0}
  .wait-demo{grid-template-columns:1fr}.wait-demo>i{justify-self:center}
  .anatomy-card{padding:20px}.anatomy-card ol{grid-template-columns:1fr 1fr}.large-hand .tile{width:32px;height:45px}
  .wide-tiles{padding-bottom:10px}.wide-tiles .tile{width:27px;height:39px}
}