@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Noto+Sans+JP:wght@400;600;800&display=swap');
:root{--ink:#222820;--green:#405b38;--paper:#f7f6ef;--muted:#787b71;--line:#dddfd3}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:'DM Sans',sans-serif;font-size:14px}button,input,select{font:inherit}button,a,select{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.5;cursor:wait}button:focus-visible,a:focus-visible,select:focus-visible{outline:3px solid #92a872;outline-offset:4px}header{height:94px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 5.5%}.brand{display:flex;align-items:center;text-decoration:none;color:var(--ink);font-size:24px;font-weight:700;letter-spacing:-1px}.brand-light{font-weight:400}.logo{background:var(--green);color:white;border-radius:9px;font-family:'Noto Sans JP',sans-serif;padding:4px 10px;margin-right:11px;font-size:28px}.edition{font-size:9px;font-weight:600;letter-spacing:1.5px;border-left:1px solid var(--line);padding-left:23px;margin-left:23px}.connection{font-size:11px;color:var(--muted)}.connection:before{content:' ';display:inline-block;width:7px;height:7px;border-radius:50%;background:#bdab70;margin-right:8px}.connection.online:before{background:#6f8e58}main{max-width:1160px;margin:auto;padding:0 32px}.intro{position:relative;padding:55px 0 45px}.eyebrow,.section-label{font-size:10px;letter-spacing:1.7px;font-weight:700;color:var(--muted)}.eyebrow{color:var(--green)}h1{font-size:54px;letter-spacing:-2.5px;line-height:1.12;margin:19px 0}h1 span{color:var(--green)}.intro p{color:var(--muted);line-height:1.8}.intro-stamp{position:absolute;right:55px;top:65px;transform:rotate(9deg);width:153px;height:153px;border:1px solid #b8c0a7;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-direction:column;color:var(--green);outline:1px solid #b8c0a7;outline-offset:7px}.intro-stamp span{font-family:'Noto Sans JP',sans-serif;font-size:42px}.intro-stamp small{font-size:8px;letter-spacing:1px;margin-top:10px}.workspace{display:grid;grid-template-columns:300px 1fr;gap:40px}h2{font-size:18px;letter-spacing:-.5px;margin:13px 0 8px}.muted{color:var(--muted);font-size:12px;line-height:1.6;margin:0}.modes{display:grid;gap:10px;margin:25px 0}.modes button{background:transparent;border:1px solid var(--line);border-radius:8px;padding:17px 13px;display:flex;align-items:center;gap:12px;text-align:left;color:var(--ink)}.modes button.selected{border-color:var(--green);background:#eaf0e1;box-shadow:inset 0 0 0 1px var(--green)}.mode-kana{font-family:'Noto Sans JP',sans-serif;width:35px;font-size:19px;color:var(--green)}.modes b{display:block;font-size:12px}.modes small{display:block;font-size:10px;color:var(--muted);margin-top:5px}.radio{margin-left:auto;border:1px solid #bcc1b1;width:13px;height:13px;border-radius:50%;flex-shrink:0}.selected .radio{border:4px solid var(--green);background:white}select{width:100%;background:transparent;border:1px solid var(--line);border-radius:6px;padding:13px;margin-top:10px;color:var(--ink)}.progress{border-top:1px solid var(--line);margin-top:30px;padding-top:23px}.progress>div{display:flex;align-items:center;gap:10px;margin:15px 0 8px}.progress strong{font-size:32px}.progress div span{font-size:11px;color:var(--muted)}.progress .spark{margin-left:auto;font-size:30px;color:#a5b48c}.progress p{font-size:11px;color:var(--muted)}.practice{border:1px solid var(--line);border-radius:12px;background:#fffef9;overflow:hidden;box-shadow:0 5px 15px #28301f04}.practice-top{display:flex;align-items:center;justify-content:space-between;padding:20px 25px}.tag{font-size:9px;letter-spacing:1px;background:#edf0e6;color:var(--green);padding:6px 9px;border-radius:4px}.panel{height:270px;margin:0 23px;border:2px solid var(--ink);position:relative;overflow:hidden;background-color:#eeeedf;background-image:radial-gradient(#bec4ac 0.65px,transparent .65px);background-size:5px 5px;display:flex;align-items:center;justify-content:center}.panel-caption{position:absolute;left:0;top:0;max-width:80%;background:#fffef9;border-right:2px solid var(--ink);border-bottom:2px solid var(--ink);padding:10px 13px;font-size:11px;z-index:2}.bubble{background:#fffefb;min-width:210px;max-width:88%;padding:20px 27px;border:2px solid var(--ink);border-radius:50%;transform:rotate(-4deg);position:relative;box-shadow:5px 5px 0 #222820}.bubble:after{content:'';position:absolute;right:28px;bottom:-16px;width:23px;height:30px;background:#fffefb;border-right:2px solid var(--ink);transform:skewY(-40deg) rotate(25deg)}#target{display:block;text-align:center;font-family:'Noto Sans JP',sans-serif;font-weight:800;font-size:clamp(30px,4vw,60px);position:relative;z-index:1;overflow-wrap:anywhere}.panel-sound{position:absolute;bottom:25px;left:25px;transform:rotate(-15deg);font-family:'Noto Sans JP',sans-serif;font-size:27px;font-weight:800}.panel-number{position:absolute;bottom:10px;right:12px;font-size:9px;letter-spacing:2px}.answer-area{padding:24px}.answer-title{display:flex;align-items:center;justify-content:space-between;gap:10px}.answer-title h2{margin:0 0 7px}.text-button{border:0;background:none;color:var(--green);font-size:11px;font-weight:700;padding:7px 0}.answer-title .text-button{font-weight:400}form{display:flex;gap:10px;margin-top:20px}input{width:100%;min-width:0;padding:14px;border:1px solid var(--line);background:white;border-radius:6px;outline-color:var(--green)}.primary{border:0;background:var(--green);color:white;border-radius:6px;padding:14px 20px;white-space:nowrap;font-size:12px}.primary span{margin-left:15px}.practice-bottom{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:14px}.practice-bottom>span{color:var(--muted);font-size:10px}.reference{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:42px;padding:25px 0}.reference-heading{display:flex;align-items:center;justify-content:space-between}.reference h2{margin-bottom:0}#chart{grid-template-columns:repeat(5,1fr);gap:8px;margin-top:24px}#chart:not([hidden]){display:grid}.kana-cell{background:#eeefe5;border-radius:5px;text-align:center;padding:8px}.kana-cell b{font-size:23px;font-family:'Noto Sans JP',sans-serif;display:block}.kana-cell span{font-size:11px;color:var(--muted)}#chart-tip{line-height:1.8;color:var(--muted);max-width:700px;font-size:12px}footer{display:flex;justify-content:space-between;padding:24px 0;color:var(--muted);font-size:10px}footer span:last-child{font-size:9px;letter-spacing:1px}#feedback,#hint{background:#edf2e5;border-radius:6px;padding:12px;font-size:12px;line-height:1.6}#feedback.error{background:#fff0e5;color:#87512e}.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}@media(max-width:760px){header{height:75px;padding:0 20px}.edition{display:none}.brand{font-size:21px}.connection{font-size:9px}main{padding:0 20px}.intro{padding:35px 0}h1{font-size:40px}.intro-stamp{display:none}.workspace{grid-template-columns:1fr;gap:25px}.modes{grid-template-columns:repeat(3,1fr);gap:7px;margin:16px 0}.modes button{flex-direction:column;padding:12px 5px;text-align:center;gap:6px}.modes small,.radio{display:none}.mode-kana{width:auto}.progress{display:none}.panel{height:230px;margin:0 15px}.answer-area{padding:18px}.answer-title h2{font-size:16px}form{flex-direction:column}.primary{padding:15px}.reference-heading{gap:10px}.reference h2{font-size:16px}footer{gap:15px;font-size:9px}.practice-top{padding:18px}.section-label{font-size:9px}}
.mode-kana{min-width:39px;white-space:nowrap;font-size:18px}.modes button>span:nth-child(2){min-width:0}
.first-lesson{border:1px solid var(--line);background:#fffef9;border-radius:12px;padding:25px;margin:0 0 35px}.first-lesson>p{max-width:760px;line-height:1.8;color:var(--muted)}.vowel-cards{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin:23px 0}.vowel-card{border:1px solid var(--line);border-radius:8px;background:var(--paper);padding:17px 12px;display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--ink)}.vowel-card.active{border:2px solid var(--green);background:#edf2e5}.vowel-card>span{font-size:42px;font-family:'Noto Sans JP',sans-serif}.vowel-card>b{font-size:21px}.vowel-card small{line-height:1.6;min-height:65px;font-size:11px}.vowel-card em{font-size:11px;font-style:normal;color:var(--green);margin-top:auto}.lesson-actions{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:20px}.lesson-actions>span{font-size:12px;color:var(--muted)}.study{background:#edf2e5;border-radius:8px;padding:20px}.study h2{font-size:27px;letter-spacing:1px}.study p{line-height:1.8;font-size:13px}.study button{display:block;margin-top:10px}.study .primary{white-space:normal;text-align:left}#quiz[hidden],#study[hidden]{display:none}@media(max-width:760px){.first-lesson{padding:18px}.vowel-cards{grid-template-columns:repeat(2,1fr);gap:8px}.vowel-card small{min-height:0}.vowel-card:last-child{grid-column:1/-1}.lesson-actions{align-items:flex-start;flex-direction:column}}