:root{--paper:#f3f2ec;--ink:#191919;--red:#e73522;--line:#d1d0c9;--muted:#6a6963;--green:#28634b}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,'Helvetica Neue','Microsoft YaHei',sans-serif;font-size:14px}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer;color:inherit;border:1px solid var(--ink);background:transparent;padding:13px 18px;transition:background .15s,color .15s}button:hover{background:var(--ink);color:white}button:disabled{opacity:.5;cursor:default}button:focus-visible,a:focus-visible{outline:3px solid var(--red);outline-offset:4px}button.primary{background:var(--red);color:white;border-color:var(--red)}button.primary:hover{background:#bc2b1c}button.dark{background:var(--ink);color:white}button.small{padding:8px 12px;font-size:12px}button.text{border:0;padding:8px 0;text-decoration:underline;text-underline-offset:5px}a{color:inherit;text-underline-offset:4px}header{height:87px;border-bottom:1px solid var(--ink);display:flex;align-items:center;justify-content:space-between;padding:0 4vw;gap:24px}.brand{font-size:24px;letter-spacing:-1px;font-weight:800;display:flex;align-items:center;gap:12px}.logo{width:31px;height:31px;background:var(--red);display:block}.brand small{font-size:10px;font-weight:500;letter-spacing:1px;line-height:1.5;margin-left:12px}.edition{font-size:11px;letter-spacing:1px}nav{display:flex;gap:26px}nav button{border:0;padding:32px 0 27px;font-weight:600;border-bottom:4px solid transparent}nav button.active{border-color:var(--red)}nav button:hover{background:none;color:var(--red)}main{max-width:1440px;padding:35px 4vw 50px;margin:auto}.eyebrow{font-size:11px;letter-spacing:1.8px;font-weight:700;text-transform:uppercase}.red{color:var(--red)}.muted{color:var(--muted)}.topline{display:flex;justify-content:space-between;align-items:center;margin-bottom:26px}.hero{display:grid;grid-template-columns:1.1fr 1fr;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);min-height:385px}.hero-copy{padding:36px 35px 35px 0}.hero h1{font-size:clamp(48px,5.8vw,82px);letter-spacing:-4px;line-height:1.14;font-weight:800;margin:22px 0}.hero p{line-height:1.9;max-width:420px;color:#565650}.actions{display:flex;align-items:center;gap:18px;margin-top:24px;flex-wrap:wrap}.poster{position:relative;border-left:1px solid var(--ink);overflow:hidden;display:flex;flex-direction:column;justify-content:space-between;background:repeating-linear-gradient(0deg,transparent,transparent calc(25% - 1px),#deddd6 calc(25% - 1px),#deddd6 25%),repeating-linear-gradient(90deg,transparent,transparent calc(25% - 1px),#deddd6 calc(25% - 1px),#deddd6 25%)}.poster-top{display:flex;justify-content:space-between;padding:22px;font-size:11px;z-index:1}.big-kana{font-family:'Yu Gothic','Meiryo',sans-serif;font-weight:800;font-size:240px;line-height:1;text-align:center;z-index:1;letter-spacing:-20px}.circle{position:absolute;background:var(--red);border-radius:50%;width:245px;height:245px;left:calc(50% - 25px);top:78px}.poster-bottom{display:flex;justify-content:space-between;padding:20px;z-index:1}.stats{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--ink)}.stat{padding:25px 22px;border-right:1px solid var(--line)}.stat:first-child{padding-left:0}.stat:last-child{border:0}.stat b{font-size:36px;font-weight:500;letter-spacing:-1px}.stat span{font-size:12px;color:var(--muted);margin-left:12px}.section-head{display:flex;align-items:end;justify-content:space-between;margin:38px 0 20px;gap:16px}.section-head h2{font-size:26px;letter-spacing:-1px;margin:8px 0 0}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}.card{border-top:3px solid var(--ink);padding:19px 0;display:flex;flex-direction:column;align-items:flex-start}.card h3{font-size:23px;margin:20px 0 8px}.card p{line-height:1.8;color:var(--muted);flex:1}.card .glyphs{font-size:49px;letter-spacing:12px;margin:18px 0}.card button{width:100%;display:flex;justify-content:space-between}.tag{font-size:11px;padding:5px 8px;background:#e5e4dd}.footer{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--ink);padding-top:20px;margin-top:40px;font-size:11px;color:var(--muted)}.page-title{font-size:48px;letter-spacing:-2px;margin:10px 0 14px}.intro{max-width:650px;line-height:1.9;color:var(--muted)}.toolbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:26px 0}.seg{display:flex}.seg button{margin-right:-1px}.seg .selected{background:var(--ink);color:#fff}.kana-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}.kana-cell{border:0;background:var(--paper);min-height:118px;text-align:left;position:relative;display:flex;justify-content:space-between;align-items:end;padding:20px}.kana-cell strong{font-size:44px;font-weight:500}.kana-cell small{font-size:12px;color:var(--muted)}.kana-cell:hover small{color:#ddd}.dot{width:6px;height:6px;border-radius:50%;position:absolute;right:15px;top:15px;background:#d1d0c9}.dot.learning{background:var(--red)}.dot.steady{background:var(--green)}.group-row{display:grid;grid-template-columns:180px 1fr;align-items:center;margin-bottom:15px;gap:20px}.group-label{display:flex;flex-direction:column;align-items:start;gap:12px}.empty-cell{background:var(--paper);opacity:.5}.legend{display:flex;gap:22px;font-size:12px;color:var(--muted)}.legend i{display:inline-block;width:6px;height:6px;background:var(--red);margin-right:6px;border-radius:50%}.lesson{max-width:860px;margin:auto}.lesson-top{display:flex;align-items:center;justify-content:space-between;gap:15px}.progress{height:3px;background:var(--line);margin:23px 0}.progress>div{height:100%;background:var(--red)}.study-card{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);margin-top:26px}.study-char{font-size:180px;text-align:center;line-height:1.5;border-right:1px solid var(--line);font-family:'Yu Gothic',Meiryo,sans-serif}.study-info{padding:35px}.study-info h2{font-size:45px;margin:12px 0}.study-info p{line-height:1.9}.note{border-left:3px solid var(--red);padding:12px 18px;background:#eae9e2;line-height:1.8;font-size:13px}.quiz-char{font-family:'Yu Gothic',Meiryo,sans-serif;font-size:160px;text-align:center;padding:18px}.question{text-align:center;font-size:16px}.options{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:24px 0}.options button{font-size:24px;padding:22px}.answer-form{display:flex;gap:10px;margin:22px auto;max-width:440px}.answer-form input{width:100%;min-width:0;border:1px solid var(--ink);background:transparent;padding:16px;font-size:22px;border-radius:0}.feedback{padding:20px;background:#e5e9df;line-height:1.9;margin-top:20px;border-top:3px solid var(--green)}.feedback.wrong{background:#f1e1d9;border-color:var(--red)}.feedback strong{font-size:20px}.session-end{text-align:center;padding:50px 0}.session-end h1{font-size:50px}.session-end .score{font-size:92px;color:var(--red);letter-spacing:-5px}.pairs{display:grid;grid-template-columns:repeat(2,1fr);gap:25px}.pair{border:1px solid var(--line);padding:25px}.pair-letters{display:flex;gap:40px;font-size:74px}.pair-letters span{display:flex;flex-direction:column}.pair-letters small{font-size:14px;color:var(--red);letter-spacing:1px}.pair p{min-height:42px;line-height:1.8}.word-layout{display:grid;grid-template-columns:260px 1fr;gap:50px}.word-card{border:1px solid var(--ink);min-height:330px;padding:50px;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center}.word-card h2{font-size:58px;margin:20px 0}.word-card .reading{font-size:21px;letter-spacing:3px}.word-card .meaning{font-size:24px;color:var(--red);margin:20px 0}.word-list{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-top:30px}.word-list button{border:0;background:var(--paper);display:flex;justify-content:space-between;gap:8px;padding:18px}.word-list button:hover{background:var(--ink)}dialog{width:min(650px,calc(100% - 30px));max-height:85vh;border:1px solid var(--ink);background:var(--paper);padding:30px;color:var(--ink)}dialog::backdrop{background:#0008}dialog h2{font-size:30px}dialog p,dialog li{line-height:1.9}dialog .close{float:right}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;padding:14px 22px;z-index:9;max-width:90%;display:none}.lesson-bottom{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:25px}.radio-line{line-height:2}.rule-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.rule-grid article{border-top:2px solid var(--ink);line-height:1.9;padding-top:15px}.rule-grid strong{font-size:25px}.notice{color:var(--red);line-height:1.8}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(min-width:1500px){header{padding-left:calc((100vw - 1325px)/2);padding-right:calc((100vw - 1325px)/2)}}@media(max-width:900px){header{height:auto;flex-wrap:wrap;padding-top:20px;gap:12px}nav{width:100%;justify-content:space-between;gap:8px}nav button{padding:14px 0;font-size:13px}.edition{display:none}.hero h1{font-size:58px}.big-kana{font-size:190px}.circle{width:180px;height:180px}.group-row{grid-template-columns:120px 1fr;gap:12px}.kana-cell{padding:13px;min-height:95px}.word-layout{grid-template-columns:190px 1fr;gap:25px}.cards{gap:15px}.card h3{font-size:20px}}@media(max-width:600px){main{padding:22px 20px 35px}header{padding-left:20px;padding-right:20px}.brand small{font-size:9px}.topline{font-size:10px}.hero{grid-template-columns:1fr}.hero-copy{padding:25px 0}.hero h1{font-size:57px;margin:15px 0}.poster{border-left:0;border-top:1px solid var(--ink);height:270px}.big-kana{font-size:180px}.circle{top:55px;left:48%}.poster-top,.poster-bottom{padding:12px 16px}.stats{grid-template-columns:1fr 1fr}.stat{padding:18px 0!important;border-right:0;border-bottom:1px solid var(--line)}.stat b{font-size:32px}.stat span{margin-left:10px}.cards{grid-template-columns:1fr}.card{padding-bottom:10px}.card h3{margin-top:15px}.card .glyphs{display:none}.card p{margin-top:0}.section-head{margin-top:30px}.section-head h2{font-size:23px}.group-row{display:block;margin-bottom:25px}.group-label{flex-direction:row;justify-content:space-between;align-items:center;margin-bottom:12px}.kana-cell{min-height:85px;display:block;padding:12px 6px}.kana-cell strong{font-size:34px;display:block}.kana-cell small{font-size:11px}.page-title{font-size:38px}.pairs,.rule-grid{grid-template-columns:1fr}.study-card{grid-template-columns:1fr}.study-char{font-size:140px;border-right:0;border-bottom:1px solid var(--line)}.study-info{padding:22px}.study-info h2{font-size:36px;margin:5px 0}.options{grid-template-columns:1fr 1fr}.options button{padding:16px}.quiz-char{font-size:130px}.word-layout{display:block}.word-card{padding:25px;min-height:300px;margin-top:25px}.word-list{grid-template-columns:1fr 1fr}.word-card h2{font-size:46px}.footer{flex-direction:column;line-height:1.6}.legend{gap:12px}.lesson-bottom{align-items:stretch;flex-direction:column}.lesson-top .eyebrow{font-size:9px}}