:root{
  --primary:#2563eb; --primary2:#7c3aed; --accent:#f97316; --success:#10b981; --danger:#ef4444;
  --dark:#111827; --muted:#6b7280; --bg:#eef4ff; --card:#ffffff; --line:#e5e7eb;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,Helvetica,sans-serif;
  background:radial-gradient(circle at top left,#dbeafe 0,#eef4ff 35%,#f8fafc 100%);
  color:var(--dark)
}
a{color:var(--primary);text-decoration:none;font-weight:800}
button,select{font-family:inherit}
.hero{
  color:white;padding:28px 14px 20px;text-align:center;
  background:
    radial-gradient(circle at 12% 10%,rgba(255,255,255,.25),transparent 22%),
    linear-gradient(135deg,#1d4ed8,#7c3aed 68%,#db2777);
  border-bottom-left-radius:32px;border-bottom-right-radius:32px;
  box-shadow:0 18px 42px rgba(37,99,235,.23)
}
.hero h1{margin:0;font-size:32px;line-height:1.12;font-weight:950}
.hero p{margin:10px auto 0;max-width:760px;font-size:15px;opacity:.96;line-height:1.55}
.hero-badges{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:15px}
.badge{background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.28);padding:8px 11px;border-radius:999px;font-size:12px;font-weight:900}
nav{
  position:sticky;top:0;z-index:20;background:rgba(255,255,255,.9);backdrop-filter:blur(16px);
  box-shadow:0 8px 20px rgba(15,23,42,.07);padding:10px 12px
}
.navwrap{max-width:1160px;margin:auto;display:flex;gap:9px;overflow-x:auto;white-space:nowrap;padding-bottom:2px}
.navwrap a{color:var(--dark);font-size:13px;padding:9px 12px;border-radius:999px;background:#f1f5f9;flex:0 0 auto}
.container{max-width:1160px;margin:18px auto;padding:0 12px}
.grid{display:grid;grid-template-columns:2.1fr .9fr;gap:16px}
.card{
  background:rgba(255,255,255,.96);border:1px solid rgba(148,163,184,.25);border-radius:24px;
  box-shadow:0 16px 38px rgba(15,23,42,.08);padding:18px;margin-bottom:16px
}
.glass{background:rgba(255,255,255,.72);backdrop-filter:blur(16px)}
.dashboard{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.dash-card{background:linear-gradient(135deg,#fff,#f8fafc);border:1px solid var(--line);border-radius:18px;padding:14px}
.dash-card b{display:block;font-size:22px;margin-top:5px}
.dash-card span{font-size:12px;color:var(--muted);font-weight:800;text-transform:uppercase;letter-spacing:.5px}
.start-panel{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.mode-card{border:2px solid #e5e7eb;border-radius:20px;padding:14px;background:#fff;cursor:pointer;transition:.2s;min-height:108px}
.mode-card.active{border-color:var(--primary);box-shadow:0 12px 25px rgba(37,99,235,.16);transform:translateY(-2px)}
.mode-card h3{margin:0 0 8px;font-size:16px}
.mode-card p{margin:0;color:var(--muted);line-height:1.45;font-size:13px}
.top-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;align-items:center}
.controls{display:flex;gap:9px;flex-wrap:wrap}
select,button{
  padding:12px 15px;border-radius:15px;border:1px solid #d1d5db;font-size:15px;font-weight:850;background:white
}
button{border:0;color:white;cursor:pointer;border-radius:999px;background:linear-gradient(135deg,var(--primary),var(--primary2));box-shadow:0 9px 20px rgba(37,99,235,.23)}
button.secondary{background:linear-gradient(135deg,var(--accent),#ef4444)}
button.light{background:#e5e7eb;color:var(--dark);box-shadow:none}
.progressbar{height:13px;background:#e5e7eb;border-radius:999px;overflow:hidden;margin:12px 0}
.progressfill{height:100%;background:linear-gradient(135deg,var(--success),#22c55e);width:0%;transition:.3s}
.question{
  border:1px solid #e5e7eb;border-radius:21px;padding:16px;margin:15px 0;background:#fbfdff;
  box-shadow:0 8px 18px rgba(15,23,42,.04)
}
.q-top{display:flex;justify-content:space-between;gap:8px;align-items:center}
.tag{display:inline-block;font-size:12px;color:white;background:var(--dark);padding:6px 10px;border-radius:999px;margin-bottom:8px;font-weight:900}
.q-title{font-size:17px;font-weight:950;line-height:1.5;margin:6px 0 11px}
.visual-wrap{background:#f8fafc;border:1px dashed #cbd5e1;border-radius:18px;padding:12px;margin:10px 0;text-align:center}
.visual-svg{width:180px;max-width:100%;height:auto}
.visual-wide{width:390px;max-width:100%;height:auto}
.visual-grid{width:230px;max-width:100%;height:auto}
.option{display:flex;align-items:flex-start;gap:9px;padding:13px;margin:9px 0;border-radius:16px;background:white;border:1px solid #e5e7eb;cursor:pointer;font-weight:750;line-height:1.35;transition:.15s}
.option input{margin-top:3px;transform:scale(1.12)}
.option:has(input:checked){border-color:var(--primary);background:#eff6ff;box-shadow:0 8px 16px rgba(37,99,235,.08)}
.result-box{display:none;border-radius:23px;padding:18px;background:#ecfdf5;border:1px solid var(--success);margin-bottom:16px}
.score{font-size:32px;font-weight:950;color:#065f46;margin:0}
.correct{border-color:var(--success);background:#ecfdf5}
.wrong{border-color:var(--danger);background:#fef2f2}
.solution{margin-top:10px;padding:13px;border-radius:15px;background:#fff7ed;border:1px solid #fdba74;line-height:1.55;display:none;font-size:14px}
.links{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.links a{background:#f1f5f9;border-radius:999px;padding:9px 12px;color:var(--dark);font-size:13px}
.notice{background:#eff6ff;border-left:5px solid var(--primary);padding:13px;border-radius:14px;line-height:1.65}
.article h2,.article h3{margin-top:24px}
.article p,.article li{line-height:1.75}
.small{font-size:13px;color:var(--muted);line-height:1.55}
.footer{background:#111827;color:#e5e7eb;margin-top:30px;padding:25px 14px;text-align:center;font-size:13px}
.footer a{color:white}
.adbox{min-height:120px;border:2px dashed #cbd5e1;border-radius:18px;display:flex;align-items:center;justify-content:center;color:#64748b;text-align:center;padding:10px;background:#f8fafc}
@media(max-width:920px){
  .grid{grid-template-columns:1fr}.dashboard{grid-template-columns:repeat(2,1fr)}.start-panel{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:560px){
  .hero{padding-top:24px;border-bottom-left-radius:24px;border-bottom-right-radius:24px}.hero h1{font-size:24px}.hero p{font-size:14px}
  .container{margin-top:12px;padding:0 10px}.card{border-radius:21px;padding:14px}
  .dashboard{grid-template-columns:repeat(2,1fr);gap:8px}.dash-card{padding:12px}.dash-card b{font-size:19px}
  .start-panel{grid-template-columns:1fr}.mode-card{min-height:auto}
  .top-row{display:block}.controls{display:block}select,button{width:100%;margin-top:9px}
  .q-title{font-size:16px}.question{padding:13px;border-radius:18px}.option{padding:13px;font-size:15px}
  .score{font-size:28px}.navwrap a{font-size:12px;padding:8px 10px}
}