:root{--bg: #fafafa;--fg: #1f2937;--muted: #6b7280;--line: #e5e7eb;--accent: #1f2937;font-family:Apple SD Gothic Neo,Malgun Gothic,Noto Sans KR,system-ui,sans-serif;color:var(--fg);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-height:100vh}#root{max-width:480px;margin:0 auto;padding:16px 16px 72px}h1{font-size:20px;margin:8px 0 16px}button{font:inherit}.card{border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:12px;background:#fff}.card p{margin:4px 0}.muted{color:var(--muted);font-size:13px}.notice{background:#fef3c7;border-radius:8px;padding:8px 12px;font-size:13px}.btn{display:block;text-align:center;background:var(--accent);color:#fff;text-decoration:none;border:0;border-radius:10px;padding:12px;font-weight:600;margin-top:10px;width:100%;cursor:pointer}.btn.secondary{background:#fff;color:var(--fg);border:1px solid var(--fg)}.bar{height:10px;border:1px solid var(--line);border-radius:5px;overflow:hidden;margin:8px 0 4px}.bar i{display:block;height:100%;background:var(--accent)}.tabs{position:fixed;left:0;right:0;bottom:0;display:flex;justify-content:space-around;border-top:1px solid var(--line);background:#fff;padding:10px 0 max(10px,env(safe-area-inset-bottom))}.tabs a{color:var(--muted);text-decoration:none;font-size:14px}.tabs a.active{color:var(--fg);font-weight:700}.kanji-card{text-align:center}.kanji-big{font-size:96px;line-height:1.1;margin:12px 0;font-family:Yu Mincho,Hiragino Mincho ProN,"Noto Serif JP",serif}.hint{font-size:18px;margin:12px 0}.hun{font-size:20px;font-weight:600;margin:8px 0 0}.reading{font-size:28px;margin:4px 0 8px}.box{text-align:left;border:1px dashed #bbb;border-radius:10px;padding:10px 12px;margin:10px 0}.box p{margin:3px 0}.grades{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin:8px 0 12px}.grades button{border:1px solid var(--fg);background:#fff;border-radius:8px;padding:10px 0;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:2px}.grades small{color:var(--muted);font-size:11px}.link{background:none;border:0;color:var(--muted);text-decoration:underline;cursor:pointer;padding:6px}.dialog{border:1px solid var(--fg);border-radius:12px;padding:12px 16px;margin:10px 0;text-align:left;background:#fff}.radio{display:block;padding:6px 0}.radio input{margin-right:8px}.row{display:flex;gap:8px}.row .btn{margin-top:8px}.progress{text-align:center;margin:0 0 4px}.chip{border:1px solid var(--line);border-radius:8px;padding:6px 10px}.chip input{margin-right:6px}