*{box-sizing:border-box}
:root{--bg:#0f172a;--card:#111827;--text:#e5e7eb;--muted:#9ca3af;--accent:#60a5fa;--danger:#ef4444}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial}
header{padding:24px 16px;text-align:center}
h1{margin:0 0 8px 0;font-size:clamp(20px,4vw,28px)}
.sub{margin:0;color:var(--muted)}
main{max-width:900px;margin:0 auto;padding:16px;display:grid;gap:16px}
.card{background:var(--card);border:1px solid #1f2937;border-radius:12px;padding:16px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:12px 0}
label{display:flex;flex-direction:column;gap:6px;font-size:14px}
input[type=number],select,input[type=file]{padding:10px;border-radius:8px;border:1px solid #374151;background:#0b1220;color:var(--text)}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
button{padding:10px 14px;border-radius:10px;border:1px solid #374151;background:#0b1220;color:var(--text);cursor:pointer}
button:hover{border-color:var(--accent)}
button.secondary{opacity:.9}
button.danger{border-color:var(--danger);color:#fecaca}
.hidden{display:none}
.quiz-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;font-size:14px;color:var(--muted)}
#questionArea{font-size:22px;margin:12px 0}
#answerArea{display:grid;gap:8px}
.choice{padding:10px;border:1px solid #374151;border-radius:10px;cursor:pointer}
.choice.selected{outline:2px solid var(--accent)}
.feedback{min-height:28px;margin-top:8px}
.feedback.good{color:#86efac}
.feedback.bad{color:#fecaca}
.small{font-size:12px;color:var(--muted)}
.small-note{opacity:.95}
footer{padding:20px 16px;text-align:center;color:var(--muted);font-size:13px}
.importer summary{cursor:pointer}
input[type=text]{padding:10px;border-radius:8px;border:1px solid #374151;background:#0b1220;color:var(--text)}