:root{--ink:#253e36;--muted:#75867f;--accent:#27725b;--line:#e2e8e3;--canvas:#f5f7f4;--surface:#fff;--soft:#eaf2ec}*{box-sizing:border-box}body{margin:0;background:var(--canvas);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI','Hiragino Sans','Microsoft YaHei',sans-serif;font-size:14px;-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit}button{cursor:pointer;border:1px solid transparent;border-radius:9px;padding:10px 16px;background:var(--accent);color:#fff;line-height:1.5;font-weight:600;transition:background .15s,box-shadow .15s,transform .15s}button:hover{filter:brightness(.96);box-shadow:0 3px 8px #203e3612}button:active{transform:translateY(1px)}button:disabled{cursor:default;opacity:.55}button.secondary{background:var(--soft);color:var(--accent)}input,select,textarea{border:1px solid #d9e2dc;border-radius:9px;padding:11px 13px;background:white;color:var(--ink);max-width:100%;min-width:0}input::placeholder,textarea::placeholder{color:#9ba7a0}button:focus-visible,a:focus-visible{outline:3px solid #8fbca7;outline-offset:3px}input:focus,select:focus,textarea:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px #27725b12}textarea{width:100%;min-height:320px;resize:vertical;line-height:1.7}header{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 32px;border-bottom:1px solid var(--line);background:var(--surface);gap:16px;position:sticky;top:0;z-index:5}header strong{font-size:23px;letter-spacing:-.8px;white-space:nowrap}header small{color:var(--muted);margin-left:14px;font-size:12px;font-weight:500;letter-spacing:1px}.layout{display:grid;grid-template-columns:224px minmax(0,1fr);min-height:calc(100vh - 76px)}nav{padding:30px 16px;background:var(--surface);border-right:1px solid var(--line);position:sticky;top:76px;height:calc(100vh - 76px);display:flex;flex-direction:column;gap:6px}nav button{width:100%;text-align:left;background:transparent;color:var(--muted);padding:13px 16px;font-weight:500}nav button.active{background:var(--soft);color:var(--accent);font-weight:600}nav p{margin-top:auto;padding:18px 14px 0;border-top:1px solid var(--line);font-size:13px}main{padding:36px clamp(24px,4vw,64px) 56px;max-width:1440px;width:100%;min-width:0}h1{font-size:29px;letter-spacing:-.8px;margin:0 0 10px;line-height:1.35;font-weight:700}h2{font-size:18px;margin:0 0 16px;line-height:1.5}p{line-height:1.75;color:var(--muted);margin:10px 0 18px}.eyebrow{font-size:10px;letter-spacing:2.4px;color:var(--muted);margin-bottom:12px;font-weight:600}.hero{background:linear-gradient(110deg,#e5efe3,#eef3e8);border:1px solid #dfe8d9;border-radius:18px;padding:32px 36px;position:relative;overflow:hidden;margin:28px 0 32px}.hero:after{content:'あ';position:absolute;right:48px;top:-34px;font-size:220px;color:#c8dbc1;font-weight:600;pointer-events:none}.hero>*{position:relative;z-index:1}.hero h2{font-size:25px;margin-bottom:8px}.hero .stats{margin-top:28px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,270px),1fr));gap:22px}.card{padding:25px;border:1px solid var(--line);border-radius:14px;background:var(--surface);margin-bottom:22px;box-shadow:0 3px 15px #18392a03;min-width:0}.grid>.card{margin-bottom:0}.course-cover{height:160px;background:linear-gradient(145deg,#ede8d9,#e1e8d9);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:64px;font-family:serif;color:#68815f;margin-bottom:22px;position:relative}.course-cover:after{content:'LANGUAGE COLLECTION';position:absolute;bottom:14px;font-family:system-ui;font-size:9px;letter-spacing:2px;color:#7c8b72}.muted{font-size:12px;color:var(--muted)}.toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:20px 0}.pill{display:inline-flex;align-items:center;font-size:11px;background:var(--soft);border-radius:6px;padding:5px 9px;color:var(--accent);font-weight:500;white-space:nowrap}.word{font-size:52px;margin:20px 0 4px;line-height:1.5}.reading{font-size:16px;color:var(--muted)}.meaning{font-size:23px;color:var(--ink);padding:16px 0}.wordcard{max-width:760px;margin:28px auto;padding:44px}.wordcard .toolbar{justify-content:center}.wordcard .center{text-align:center}.detail{border-top:1px solid var(--line);padding-top:22px;margin-top:28px}.row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 0;border-bottom:1px solid var(--line);min-width:0}.row:last-child{border-bottom:0}.row strong{font-size:19px;font-weight:600;overflow-wrap:anywhere}.row p{margin:7px 0 0;font-size:13px}.row .toolbar{margin:0}.original{width:100%;height:auto;margin-bottom:16px;border-radius:5px}.pdf{width:100%;height:78vh;border:0}.login{max-width:440px;margin:9vh auto;padding:36px;box-shadow:0 16px 50px #1d403910}.login input{width:100%;margin-bottom:14px}.login button{width:100%;margin-top:12px}.login p{margin-bottom:26px}label{display:block;margin:16px 0 8px;font-size:13px;font-weight:500}#toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#213d36;color:white;padding:14px 22px;border-radius:10px;display:none;z-index:10;max-width:90%;box-shadow:0 8px 25px #0002}.end{text-align:center;padding:70px 20px}.stat{font-size:32px;font-weight:650;letter-spacing:-1px;line-height:1.2}.stats{display:flex;gap:42px;font-size:12px;color:var(--muted)}.stats .stat{margin-bottom:8px;color:var(--ink)}.source-text{white-space:pre-wrap;line-height:2.3;font-size:22px}.top-actions{display:flex;gap:14px;align-items:center;min-width:0}a{color:var(--accent);text-underline-offset:4px}.top-actions a{text-decoration:none}.top-actions select{font-size:12px;padding:9px 12px}.toolbar>a{font-size:12px}.row>div{min-width:0}
@media(min-width:1500px){main{margin-inline:auto}}@media(max-width:1000px){.layout{grid-template-columns:190px minmax(0,1fr)}main{padding:30px 24px}.hero:after{right:0;opacity:.6}}@media(max-width:700px){header{height:66px;padding:0 16px;gap:8px}header strong{font-size:21px}header small{display:none}.layout{display:block;min-height:calc(100vh - 66px)}nav{position:sticky;top:66px;height:auto;flex-direction:row;overflow-x:auto;padding:10px 12px;border-right:0;border-bottom:1px solid var(--line);z-index:4;gap:4px}nav button{white-space:nowrap;width:auto;margin:0;padding:10px 14px;font-size:13px;flex-shrink:0}nav p{display:none}main{padding:26px 16px 40px}h1{font-size:25px}.hero{padding:24px;margin:22px 0}.hero h2{font-size:21px}.hero:after{right:-24px;top:0;font-size:170px;opacity:.4}.stats{gap:28px}.stat{font-size:27px}.wordcard{padding:28px 22px}.word{font-size:42px}.top-actions{gap:7px}.top-actions select{width:96px}.top-actions button{font-size:12px;padding:9px 11px}.row{flex-wrap:wrap;padding:16px 0}.grid{grid-template-columns:1fr}.card{padding:22px}.course-cover{height:145px}.login{margin:7vh 18px;max-width:none;padding:28px}.toolbar input,.toolbar select{font-size:13px}.toolbar{gap:8px}.pdf{height:65vh}}
@media(prefers-reduced-motion:reduce){button{transition:none}}

.disclaimer{margin:0 0 24px;padding:16px 20px;border:1px solid var(--line);border-radius:12px;background:var(--soft);overflow-wrap:anywhere}.disclaimer h2{margin:0 0 6px;font-size:14px}.disclaimer p{margin:0;color:var(--ink);font-size:13px;line-height:1.8}.learning-login .disclaimer{margin:24px 0 0;padding:14px 16px;text-align:left}