:root {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #f4f7fb;
  background: #0c1118;
  --panel: #141b24;
  --panel-2: #1a2430;
  --line: #293544;
  --muted: #9fb0c3;
  --accent: #7dd3fc;
  --good: #86efac;
  --bad: #fca5a5;
}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;background:radial-gradient(circle at top,#172433 0,#0c1118 50%)}
button,input,select{font:inherit}
button{cursor:pointer}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:22px 4vw;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(12,17,24,.94);backdrop-filter:blur(14px);z-index:5}
.eyebrow{font-size:.78rem;color:var(--accent);text-transform:uppercase;letter-spacing:.14em}
h1,h2,p{margin-top:0}.topbar h1{margin:3px 0 0;font-size:1.45rem}
nav{display:flex;gap:8px}.nav-btn,.tab,button{border:1px solid var(--line);background:var(--panel-2);color:#fff;border-radius:10px;padding:10px 14px}.nav-btn.active,.tab.active,.primary{background:#e8f7ff;color:#07111a;border-color:#e8f7ff;font-weight:700}
main{max-width:1220px;margin:0 auto;padding:28px 24px 60px}.view{display:none}.view.active{display:block}.card{background:rgba(20,27,36,.96);border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 18px 50px rgba(0,0,0,.22)}
.toolbar{display:grid;grid-template-columns:repeat(4,minmax(140px,1fr));gap:16px;align-items:end;margin-bottom:20px}.toolbar label,.course-form label{display:flex;flex-direction:column;gap:7px;color:var(--muted);font-size:.88rem}select,input{width:100%;background:#0e151d;border:1px solid var(--line);color:#fff;border-radius:10px;padding:11px 12px;outline:none}input:focus,select:focus{border-color:var(--accent)}
.practice-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:20px}.prompt-card{min-height:520px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;position:relative}.status-row{position:absolute;top:18px;left:18px;right:18px;display:flex;justify-content:space-between;color:var(--muted);font-size:.88rem}.badge{background:#233142;color:#cdefff;border-radius:999px;padding:6px 10px}.english-prompt{font-size:clamp(3rem,8vw,6.5rem);font-weight:800;letter-spacing:-.04em}.hint{color:var(--muted);margin-top:8px}.reference-kana{font-size:8rem;line-height:1.1;margin-top:15px}.image-prompt img{max-width:260px;max-height:220px;object-fit:contain;border-radius:14px;border:1px solid var(--line);margin-bottom:20px}.stroke-guide{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:18px}.stroke-pill{border:1px solid var(--line);border-radius:999px;padding:7px 10px;color:var(--muted)}.stroke-pill.on{color:#07111a;background:var(--accent);border-color:var(--accent)}
.answer-card{min-height:520px}.answer-tabs{display:flex;gap:8px;margin-bottom:18px}.canvas-wrap{position:relative;width:min(100%,520px);aspect-ratio:1;border:1px solid var(--line);border-radius:14px;background:#fff;overflow:hidden;margin:auto}.canvas-wrap canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none}.ghost-kana{position:absolute;inset:0;display:grid;place-items:center;color:rgba(0,0,0,.09);font-size:20rem;pointer-events:none;user-select:none}.canvas-actions,.submit-row{display:flex;gap:10px;margin-top:14px}.submit-row{justify-content:flex-end}.feedback{margin-top:18px;border-radius:12px;padding:14px 16px;border:1px solid var(--line);line-height:1.45}.feedback.good{border-color:#245a35;background:#10291a;color:#c8f7d7}.feedback.bad{border-color:#6a3030;background:#2a1515;color:#ffd4d4}.hidden{display:none!important}
.course-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.course-form .primary{align-self:end}.course-items{margin-top:22px;display:grid;gap:10px}.course-item{display:grid;grid-template-columns:64px 1fr auto;gap:14px;align-items:center;background:#0f161e;border:1px solid var(--line);border-radius:12px;padding:10px}.course-item img{width:64px;height:64px;object-fit:cover;border-radius:8px}.course-item .empty-img{width:64px;height:64px;border-radius:8px;border:1px dashed var(--line);display:grid;place-items:center;color:var(--muted)}
.glossary-head{display:flex;justify-content:space-between;gap:16px;align-items:center}.glossary-head input{max-width:300px}.glossary-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:12px;margin-top:18px}.kana-card{background:#0f161e;border:1px solid var(--line);border-radius:13px;padding:15px;text-align:center}.kana-card .glyph{font-size:2.7rem}.kana-card .roma{color:var(--accent);font-weight:700}.kana-card .meta{font-size:.76rem;color:var(--muted);margin-top:4px}
@media(max-width:800px){.toolbar,.course-form,.practice-grid{grid-template-columns:1fr}.topbar{align-items:flex-start;gap:14px;flex-direction:column}.prompt-card,.answer-card{min-height:auto}.glossary-head{align-items:stretch;flex-direction:column}.glossary-head input{max-width:none}}