:root{
  --bg:#0b1220; --fg:#e6e6eb;
  --card:#111a31; --border:#22324d;
  --muted:#1a2847; --muted-border:#2a3a63;
  --accent:#1d4ed8; --accent-2:#374151;
  --good:#16a34a; --bad:#dc2626;
  --btn-fg:#ffffff;
}
.theme-light{
  --bg:#f7f9fd; --fg:#0b1220;
  --card:#ffffff; --border:#e5eaf5;
  --muted:#eef3ff; --muted-border:#dbe5ff;
  --accent:#1d4ed8; --accent-2:#374151;
  --good:#16a34a; --bad:#dc2626;
  --btn-fg:#ffffff;
}
html,body{margin:0;padding:0;font-family:IRANSans, Vazirmatn, Arial, sans-serif;background:var(--bg);color:var(--fg)}
a{color:#8ad}
.header{padding:24px 16px;background:var(--card);border-bottom:1px solid var(--border)}
.header h1{margin:0;font-size:28px}
.header p{margin:6px 0 0;opacity:.9}
.container{max-width:1100px;margin:24px auto;padding:0 16px}
.card{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:18px;margin-bottom:16px;box-shadow:0 6px 20px rgba(0,0,0,.3)}
.card h2{margin-top:0;font-size:20px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}
.module{display:flex;flex-direction:column;gap:10px}
.module h3{margin:0 0 6px 0;font-size:18px}
.module p{margin:0;opacity:.9;min-height:40px}
.badge{display:inline-block;padding:2px 8px;border-radius:999px;background:var(--muted);border:1px solid var(--muted-border);font-size:12px;margin-left:6px}
.btn{cursor:pointer;border:none;border-radius:12px;padding:10px 14px;background:var(--accent);color:var(--btn-fg);font-weight:700}
.btn.secondary{background:var(--accent-2);color:var(--btn-fg)}
.btn:disabled{opacity:.6;cursor:not-allowed}
.btn:focus{outline:2px solid var(--muted-border);outline-offset:2px}
.footer{padding:20px 16px;text-align:center;opacity:.8}
.switch{display:inline-flex;gap:6px;align-items:center;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:6px 10px}
input[type="number"], select, input[type="text"]{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:6px;color:var(--fg)}
.high-contrast *{filter:contrast(1.1) saturate(1.2)}
.topbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;margin:0 0 12px 0}
.topbar .group{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.quiz{display:none}
.quiz.active{display:block}
.question{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:12px;margin:10px 0}
.question h4{margin:0 0 8px 0;font-size:16px}
.options{display:grid;gap:8px}
.option{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:10px;display:flex;gap:8px;align-items:flex-start}
.option input{margin-top:5px}
.meta{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:12px}
.result{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px;margin-top:14px}
.question .result{color:var(--fg)!important}
.correct{border-color:var(--good)!important;background:rgba(22,163,74,.08)}
.wrong{border-color:var(--bad)!important;background:rgba(220,38,38,.08)}
.answer-badge{display:inline-block;padding:2px 8px;border-radius:8px;background:var(--muted);border:1px solid var(--muted-border);margin-right:6px;font-size:12px}
.progress{height:8px;background:rgba(0,0,0,.2);border-radius:999px;overflow:hidden}
.progress > span{display:block;height:100%;background:var(--accent)}
.table{width:100%;border-collapse:collapse}
.table th,.table td{border-bottom:1px dashed var(--border);padding:6px;text-align:right}
.certificate{display:none;background:#fff;color:#111;padding:24px;border-radius:14px}
@media print{
  body *{visibility:hidden}
  .certificate, .certificate *{visibility:visible}
  .certificate{position:absolute;left:0;top:0;width:100%}
}