:root{--ink:#17222f;--muted:#6c7784;--paper:#fffdf9;--line:#e8e1d8;--navy:#1e3a5f;--blue:#3569a7;--mint:#dff1ea;--pink:#fae6df}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:#f4f1ec;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Noto Sans CJK SC","Noto Sans JP",sans-serif}button,input,select{font:inherit}button{cursor:pointer;border:0}.shell{max-width:1200px;min-height:100vh;margin:auto;padding:30px 34px 60px}header{display:flex;justify-content:space-between;align-items:center;padding-bottom:28px;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center}.brand>span{display:grid;place-items:center;width:45px;height:45px;border-radius:14px;background:var(--navy);color:#fff;font-size:26px;font-weight:700}h1,h2,h3,p{margin:0}h1{font-size:19px}.brand p{color:var(--muted);font-size:12px;margin-top:3px}nav,.toggle{display:flex;align-items:center;gap:4px;padding:4px;background:#ebe7e0;border-radius:11px}nav button,.toggle button{border-radius:8px;padding:8px 13px;background:transparent;color:var(--muted);font-size:14px}nav button.active,.toggle button.active{color:var(--navy);background:#fff;font-weight:600;box-shadow:0 1px 3px #0000000d}.workspace{display:grid;grid-template-columns:290px 1fr;gap:34px;padding-top:38px}.controls{padding:15px 8px}.eyebrow{color:var(--blue);font-size:12px;font-weight:700;letter-spacing:.1em;text-transform:uppercase}.controls h2{font-size:27px;line-height:1.28;margin:8px 0 29px}label{display:block;color:var(--muted);font-size:13px;font-weight:600;margin:17px 0}select{display:block;width:100%;color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:14px;margin-top:8px;padding:13px 14px;outline:none;box-shadow:0 4px 14px #2b2a2708}.setting-name{color:var(--muted);font-size:13px;font-weight:600;margin:20px 0 8px}.toggle{margin:8px 0}.toggle button{flex:1;padding:8px 4px;font-size:12px}.tip{display:flex;flex-direction:column;gap:5px;padding:14px;margin-top:32px;border-radius:10px;background:var(--mint);color:#285548;font-size:12px;line-height:1.5}.tip b{font-size:13px}.card{min-height:590px;padding:32px clamp(25px,5vw,65px);background:var(--paper);border:1px solid var(--line);border-radius:20px;box-shadow:0 14px 45px #2b2a2710}.card-top{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:13px}.pill{padding:6px 10px;border-radius:20px;background:#eaf0f7;color:var(--navy);font-weight:700}.instruction{margin-top:72px;color:var(--muted);font-size:14px;text-align:center}.prompt{margin:13px auto 27px;text-align:center;font-size:clamp(55px,10vw,92px);line-height:1.15;font-weight:600;letter-spacing:.035em;color:var(--navy)}.prompt.sentence{max-width:700px;font-size:clamp(28px,5vw,48px)}.hint{text-align:center;color:var(--muted);font-size:12px;margin:-15px 0 21px}input{display:block;width:min(500px,100%);margin:0 auto;border:1.5px solid #cfd9e3;border-radius:11px;padding:15px 17px;font-size:18px;text-align:center;outline:none;background:#fff}input:focus{border-color:var(--blue);box-shadow:0 0 0 3px #3569a71a}.kana-board{display:flex;flex-wrap:wrap;justify-content:center;max-width:620px;margin:18px auto 0;gap:5px}.kana-board button{width:35px;height:35px;border-radius:7px;color:var(--navy);background:#edf3f9;font-size:16px}.kana-board .clear{width:auto;padding:0 10px;background:#f1eee9;color:var(--muted);font-size:12px}.actions{display:flex;justify-content:center;gap:10px;margin:28px auto 0}.actions button{padding:12px 17px;border-radius:9px;font-weight:600}.secondary{background:#eef0f1;color:#53606d}.primary{background:var(--navy);color:#fff;box-shadow:0 5px 12px #1e3a5f2e}.primary span{margin-left:9px}.feedback{max-width:600px;margin:30px auto 0;padding:17px 20px;border-radius:11px;line-height:1.65;font-size:14px}.feedback.good{background:#e6f5ee;color:#245b48}.feedback.bad{background:var(--pink);color:#924c3d}.feedback .answer{font-size:22px;font-weight:700;margin:3px 0}.analysis{margin-top:10px;padding-top:10px;border-top:1px solid #bd8a7e55}.hidden{display:none!important}.user-badge{color:var(--navy);font-size:13px;font-weight:600;padding-left:8px}.linklike{background:transparent;color:var(--muted);font-size:13px;padding:8px 6px}.linklike:hover{color:var(--navy)}.login{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(360px,100%);display:flex;flex-direction:column;padding:34px 30px;background:var(--paper);border:1px solid var(--line);border-radius:20px;box-shadow:0 14px 45px #2b2a2712}.login-card .brand{margin-bottom:8px}.login-card label{margin:14px 0 0}.login-card input{width:100%;text-align:left;font-size:16px;margin-top:8px}.login-card .primary{margin-top:22px;padding:13px;border-radius:11px}.login-error{margin-top:14px;color:#924c3d;font-size:13px;text-align:center}.auth-tabs{display:flex;gap:4px;padding:4px;margin-top:16px;background:#ebe7e0;border-radius:11px}.auth-tabs button{flex:1;border-radius:8px;padding:9px;background:transparent;color:var(--muted);font-size:14px;font-weight:600}.auth-tabs button.active{color:var(--navy);background:#fff;box-shadow:0 1px 3px #0000000d}.auth-form{display:flex;flex-direction:column}.checkline{display:flex;flex-direction:row;align-items:center;gap:8px;margin:14px 0 0;font-weight:500;color:var(--ink);cursor:pointer}.checkline input{width:auto;margin:0}.checkline span{font-size:13px}.auth-note{margin-top:14px;color:var(--muted);font-size:12px;line-height:1.6}.auth-note b{color:var(--navy)}.dashboard{padding-top:45px}.hero{padding:35px;border-radius:18px;background:var(--navy);color:#fff}.hero .eyebrow{color:#a8d4e9}.hero h2{margin-top:9px;font-size:27px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin:23px 0}.metric{display:flex;flex-direction:column;gap:5px;padding:20px;border:1px solid var(--line);border-radius:13px;background:#fffdf9}.metric strong{color:var(--navy);font-size:29px}.metric span{color:var(--muted);font-size:13px}.weak{padding:26px;border:1px solid var(--line);border-radius:15px;background:var(--paper)}.weak-title{display:flex;justify-content:space-between;align-items:center;gap:14px}.weak-title h3{margin:0}.weak-title .secondary{padding:9px 13px;border-radius:8px;font-size:13px;font-weight:600}.weak-title button:disabled{cursor:wait;opacity:.65}.weight-status{margin:9px 0 12px;color:var(--muted);font-size:12px}.weak-row{display:grid;grid-template-columns:105px 1fr auto;align-items:center;padding:12px 4px;border-top:1px solid var(--line)}.weak-row b{font-size:18px;color:var(--navy)}.weak-row span{color:var(--muted);font-size:13px}.weak-row em{color:#b25b49;font-style:normal;font-size:13px}.muted{color:var(--muted);font-size:14px}.app-error{max-width:700px;margin:20px auto;padding:14px 18px;border-radius:10px;background:var(--pink);color:#924c3d}@media(max-width:760px){.shell{padding:20px 16px 40px}header{padding-bottom:20px}.workspace{grid-template-columns:1fr;gap:8px;padding-top:19px}.controls{padding:12px 2px}.controls h2{margin-bottom:15px}.tip{display:none}.card{min-height:500px;padding:25px 17px;border-radius:15px}.instruction{margin-top:45px}.prompt{margin-top:11px}.metrics{grid-template-columns:repeat(2,1fr)}.hero{padding:26px 21px}.weak{padding:19px}.weak-row{grid-template-columns:80px 1fr auto}}