:root{
  --bg:#061522;--panel:#0b2032;--panel2:#102b40;--text:#f3f8fc;--muted:#a8bac8;--line:#214158;
  --accent:#25d2d6;--accent2:#7ce8dc;--ok:#36d17f;--bad:#ff6b6b;--warn:#ffca5c;--white:#fff;
  --shadow:0 18px 60px rgba(0,0,0,.24);--radius:20px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 20% 0%,#0d2b43 0,transparent 35%),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;min-height:100vh}
button,input,select{font:inherit}.app-shell{min-height:100vh;display:flex;flex-direction:column}.topbar{position:sticky;top:0;z-index:20;backdrop-filter:blur(18px);background:rgba(6,21,34,.86);border-bottom:1px solid rgba(255,255,255,.07);padding:14px clamp(16px,3vw,42px);display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{display:flex;align-items:center;gap:12px;color:var(--text);background:none;border:0;padding:0;text-align:left;cursor:pointer}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,var(--accent),#3d8cff);color:#03131f;font-weight:900;box-shadow:0 8px 26px rgba(37,210,214,.2)}.brand strong{display:block;font-size:15px}.brand small{display:block;color:var(--muted);font-size:12px;margin-top:2px}.top-actions{display:flex;gap:10px;align-items:center}.verified{font-size:12px;color:var(--accent2);border:1px solid rgba(124,232,220,.25);background:rgba(124,232,220,.07);padding:7px 10px;border-radius:999px}.main{width:min(1180px,calc(100% - 28px));margin:0 auto;flex:1;padding:34px 0 54px}.footer{border-top:1px solid rgba(255,255,255,.07);color:#7990a2;font-size:12px;text-align:center;padding:22px 16px 30px}.footer p{margin:4px 0}
.hero{display:grid;grid-template-columns:1.3fr .7fr;gap:24px;align-items:stretch;margin-bottom:24px}.hero-card,.stat-card,.mode-card,.quiz-card,.result-card,.source-card{border:1px solid rgba(255,255,255,.08);background:linear-gradient(180deg,rgba(16,43,64,.94),rgba(8,29,45,.94));box-shadow:var(--shadow);border-radius:var(--radius)}.hero-card{padding:clamp(24px,4vw,48px);position:relative;overflow:hidden}.hero-card:after{content:"";position:absolute;width:250px;height:250px;border-radius:50%;right:-70px;bottom:-120px;border:30px solid rgba(37,210,214,.08)}.kicker{color:var(--accent2);font-weight:800;text-transform:uppercase;letter-spacing:.12em;font-size:12px}.hero h1{font-size:clamp(34px,5vw,62px);line-height:1.02;margin:10px 0 16px;letter-spacing:-.04em}.hero h1 span{color:var(--accent)}.hero p{max-width:760px;color:#c0cfda;line-height:1.65;margin:0 0 22px;font-size:16px}.hero-badges{display:flex;gap:10px;flex-wrap:wrap}.pill{padding:8px 11px;border-radius:999px;background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.08);font-size:12px;color:#d8e6ef}.stat-stack{display:grid;grid-template-columns:1fr 1fr;gap:14px}.stat-card{padding:20px;min-height:126px;display:flex;flex-direction:column;justify-content:center}.stat-card strong{font-size:34px;letter-spacing:-.04em}.stat-card span{color:var(--muted);font-size:13px;line-height:1.35}.section-title{display:flex;align-items:end;justify-content:space-between;gap:16px;margin:32px 0 14px}.section-title h2{margin:0;font-size:24px}.section-title p{margin:0;color:var(--muted);font-size:13px}.mode-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.mode-card{padding:22px;cursor:pointer;transition:.18s transform,.18s border-color;background:linear-gradient(180deg,rgba(16,43,64,.94),rgba(8,29,45,.94));color:var(--text);text-align:left}.mode-card:hover{transform:translateY(-3px);border-color:rgba(37,210,214,.45)}.mode-card .icon{font-size:28px}.mode-card h3{font-size:17px;margin:14px 0 7px}.mode-card p{font-size:13px;color:var(--muted);line-height:1.45;margin:0}.mode-card .meta{display:block;color:var(--accent2);font-size:12px;margin-top:13px}.theme-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.theme-btn{background:rgba(255,255,255,.035);border:1px solid var(--line);border-radius:16px;padding:15px 16px;color:var(--text);display:flex;align-items:center;justify-content:space-between;gap:12px;cursor:pointer;text-align:left}.theme-btn:hover{border-color:var(--accent)}.theme-btn span:last-child{color:var(--muted);font-size:12px}.progress-panel{margin-top:26px;padding:20px;border-radius:18px;border:1px solid var(--line);background:rgba(255,255,255,.025)}.progress-row{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center;margin:10px 0}.bar{height:8px;background:#07131f;border-radius:999px;overflow:hidden}.bar>span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),#55a7ff);border-radius:inherit}.small{font-size:12px;color:var(--muted)}
.quiz-head{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;margin-bottom:15px}.quiz-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.quiz-meta strong{font-size:14px}.timer{padding:10px 13px;border-radius:12px;background:rgba(255,202,92,.08);border:1px solid rgba(255,202,92,.28);color:var(--warn);font-variant-numeric:tabular-nums;font-weight:800}.progress-track{height:8px;background:#0b2032;border-radius:999px;overflow:hidden;margin-bottom:18px}.progress-track span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),#55a7ff)}.quiz-card{padding:clamp(20px,3vw,34px)}.qtop{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.qtheme{font-size:12px;color:var(--accent2);text-transform:uppercase;font-weight:800;letter-spacing:.08em}.qcount{font-size:12px;color:var(--muted)}.illustration{min-height:205px;border-radius:18px;display:grid;place-items:center;overflow:hidden;background:linear-gradient(180deg,#071828,#0b2639);border:1px solid rgba(255,255,255,.08);margin-bottom:22px}.illustration svg{width:100%;max-height:245px;display:block}.quiz-card h2{font-size:clamp(20px,3vw,29px);line-height:1.28;margin:0 0 8px}.instruction{color:var(--muted);font-size:12px;margin-bottom:18px}.choices{display:grid;gap:10px}.choice{display:grid;grid-template-columns:34px 1fr;align-items:center;gap:12px;border:1px solid var(--line);background:rgba(255,255,255,.025);padding:13px 15px;border-radius:15px;cursor:pointer;transition:.15s;color:var(--text);text-align:left;width:100%}.choice:hover{border-color:#3a6a86}.choice.selected{border-color:var(--accent);background:rgba(37,210,214,.09)}.choice-index{width:30px;height:30px;border-radius:9px;border:1px solid #3d5d72;display:grid;place-items:center;font-weight:800;font-size:12px;color:var(--text)}.choice.selected .choice-index{background:var(--accent);color:#04141f;border-color:var(--accent)}.quiz-actions{display:flex;justify-content:space-between;gap:12px;margin-top:22px;flex-wrap:wrap}.btn{border:0;border-radius:13px;padding:12px 17px;font-weight:800;cursor:pointer}.primary{background:linear-gradient(135deg,var(--accent),#55a7ff);color:#04131d}.secondary,.ghost{background:rgba(255,255,255,.055);border:1px solid var(--line);color:var(--text)}.danger{background:rgba(255,107,107,.09);color:#ff9d9d;border:1px solid rgba(255,107,107,.25)}.btn:disabled{opacity:.4;cursor:not-allowed}.nav-dots{display:flex;gap:5px;flex-wrap:wrap;margin-top:16px}.nav-dot{width:9px;height:9px;border-radius:50%;background:#27475d}.nav-dot.answered{background:#5a9cb9}.nav-dot.current{background:var(--accent);box-shadow:0 0 0 3px rgba(37,210,214,.12)}
.result-hero{display:grid;grid-template-columns:.8fr 1.2fr;gap:18px;margin-bottom:18px}.result-card{padding:26px}.score-ring{width:150px;height:150px;border-radius:50%;display:grid;place-items:center;margin:auto;background:conic-gradient(var(--accent) var(--pct),#183448 0);position:relative}.score-ring:after{content:"";position:absolute;inset:12px;border-radius:50%;background:#0a2132}.score-ring div{z-index:1;text-align:center}.score-ring strong{display:block;font-size:34px}.score-ring small{color:var(--muted)}.result-card h1{margin:0 0 10px;font-size:32px}.status-pass{color:var(--ok)}.status-fail{color:var(--bad)}.result-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px}.metric{padding:13px;border-radius:14px;background:rgba(255,255,255,.04)}.metric strong{display:block;font-size:22px}.metric span{font-size:11px;color:var(--muted)}.corrections{display:grid;gap:12px}.correction{border:1px solid var(--line);border-radius:17px;background:rgba(255,255,255,.025);overflow:hidden}.correction summary{list-style:none;cursor:pointer;padding:16px 18px;display:flex;align-items:flex-start;gap:12px}.correction summary::-webkit-details-marker{display:none}.badge-ok,.badge-bad{flex:0 0 auto;width:25px;height:25px;border-radius:50%;display:grid;place-items:center;font-weight:900}.badge-ok{background:rgba(54,209,127,.16);color:var(--ok)}.badge-bad{background:rgba(255,107,107,.16);color:var(--bad)}.correction-body{padding:0 18px 18px}.answer-line{padding:10px 12px;border-radius:11px;background:rgba(255,255,255,.04);margin:8px 0;font-size:13px}.answer-line.correct{border-left:3px solid var(--ok)}.answer-line.userwrong{border-left:3px solid var(--bad)}.explanation{color:#cad8e2;line-height:1.55;font-size:14px;margin:12px 0}.source-link{display:inline-flex;align-items:center;gap:7px;color:var(--accent2);text-decoration:none;font-size:13px;font-weight:700}.source-link:hover{text-decoration:underline}.source-card{padding:18px;margin-top:18px}.source-list{display:grid;gap:8px}.source-list a{color:var(--accent2);text-decoration:none;font-size:13px}.source-list a:hover{text-decoration:underline}.empty{padding:44px 22px;text-align:center;border:1px dashed var(--line);border-radius:18px;color:var(--muted)}
@media(max-width:900px){.hero{grid-template-columns:1fr}.mode-grid{grid-template-columns:1fr 1fr}.theme-grid{grid-template-columns:1fr 1fr}.result-hero{grid-template-columns:1fr}.verified{display:none}}
@media(max-width:560px){.main{width:min(100% - 20px,1180px);padding-top:18px}.topbar{padding:10px 12px}.brand small{display:none}.mode-grid,.theme-grid{grid-template-columns:1fr}.hero-card{padding:24px}.stat-stack{grid-template-columns:1fr 1fr}.stat-card{min-height:96px;padding:14px}.stat-card strong{font-size:26px}.quiz-card{padding:16px}.illustration{min-height:170px}.quiz-actions .btn{flex:1}.result-metrics{grid-template-columns:1fr}.footer{text-align:left}}