:root{
  color-scheme:dark;
  --bg:#0b1220;
  --bg-soft:#0f172a;
  --panel:#111827;
  --panel-2:#162033;
  --line:#243248;
  --text:#e5edf7;
  --muted:#94a3b8;
  --teal:#5eead4;
  --teal-2:#2dd4bf;
  --indigo:#a5b4fc;
  --danger:#fca5a5;
  --warn:#fcd34d;
  --success:#86efac;
  --shadow:0 16px 44px rgba(0,0,0,.26);
  --radius:18px;
  --radius-sm:12px;
  --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:radial-gradient(circle at 15% 0%,rgba(45,212,191,.055),transparent 28%),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55}
a{color:inherit;text-decoration:none}
button,input,select{font:inherit}
button{cursor:pointer}
.app-shell{min-height:100vh;display:flex;flex-direction:column}
.site-header{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:22px;justify-content:space-between;padding:14px max(18px,calc((100vw - var(--max))/2));background:rgba(11,18,32,.88);backdrop-filter:blur(16px);border-bottom:1px solid rgba(148,163,184,.12)}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;background:linear-gradient(145deg,#1f2937,#0f766e);color:#ccfbf1;font-weight:800;letter-spacing:.04em;box-shadow:inset 0 0 0 1px rgba(94,234,212,.16)}
.brand-copy{display:flex;flex-direction:column;line-height:1.18}.brand-copy strong{font-size:1rem}.brand-copy small{margin-top:3px;color:var(--muted);font-size:.75rem}
.main-nav{display:flex;align-items:center;gap:6px}.main-nav a{padding:9px 12px;border-radius:10px;color:#cbd5e1;font-size:.92rem}.main-nav a:hover,.main-nav a.active{background:#172236;color:#fff}.nav-toggle{display:none}
.icon-btn{border:1px solid var(--line);background:var(--panel);color:var(--text);border-radius:11px;padding:8px 11px}
main{width:min(var(--max),calc(100% - 32px));margin:0 auto;flex:1;padding:34px 0 58px}
.hero{display:grid;grid-template-columns:1.22fr .78fr;gap:26px;align-items:stretch}.hero-copy,.hero-card,.card{background:linear-gradient(180deg,rgba(17,24,39,.98),rgba(15,23,42,.98));border:1px solid rgba(148,163,184,.14);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero-copy{padding:42px}.eyebrow{display:inline-flex;align-items:center;gap:8px;color:#99f6e4;font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.eyebrow::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--teal-2)}
h1{margin:14px 0 14px;font-size:clamp(2rem,5vw,4rem);line-height:1.03;letter-spacing:-.045em}.hero-copy p{max-width:680px;color:#b8c5d6;font-size:1.06rem}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;border:0;border-radius:12px;padding:12px 17px;font-weight:750;transition:.18s ease}.btn-primary{background:var(--teal);color:#073b38}.btn-primary:hover{background:#99f6e4;transform:translateY(-1px)}.btn-secondary{background:#172236;color:#dbe7f5;border:1px solid var(--line)}.btn-secondary:hover{background:#1e2b42}.btn-danger{background:#3a1f28;color:#fecaca;border:1px solid #6b2738}
.hero-card{padding:28px;display:flex;flex-direction:column;justify-content:space-between}.hero-stat{display:flex;align-items:end;justify-content:space-between;border-bottom:1px solid var(--line);padding:14px 0}.hero-stat:last-child{border:0}.hero-stat strong{font-size:1.85rem}.hero-stat span{color:var(--muted);font-size:.9rem}
.section{margin-top:30px}.section-head{display:flex;justify-content:space-between;gap:16px;align-items:end;margin-bottom:15px}.section-head h2{margin:0;font-size:1.35rem}.section-head p{margin:3px 0 0;color:var(--muted)}
.grid{display:grid;gap:16px}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}
.card{padding:22px}.card h3{margin:0 0 8px}.card p{margin:0;color:var(--muted)}.mini-icon{width:38px;height:38px;border-radius:12px;background:#123332;color:#99f6e4;display:grid;place-items:center;margin-bottom:14px;font-weight:800}
.notice{display:flex;gap:12px;align-items:flex-start;padding:15px 17px;border:1px solid #29425b;background:#0f1b2c;border-radius:14px;color:#cbd5e1}.notice strong{color:#fff}.notice.warn{border-color:#5b4721;background:#211d12}.notice.success{border-color:#1f5a45;background:#10241d}.notice.danger{border-color:#6f2d3a;background:#2a151c}
.variant-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}.variant-card{border:1px solid var(--line);background:var(--panel);border-radius:15px;padding:18px;text-align:left;transition:.18s}.variant-card:hover{border-color:#3c6f70;transform:translateY(-2px);background:#132130}.variant-card strong{font-size:1.2rem}.variant-card span{display:block;margin-top:5px;color:var(--muted);font-size:.82rem}
.toolbar{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:18px}.toolbar-left,.toolbar-right{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.chip{display:inline-flex;align-items:center;gap:7px;padding:8px 11px;border:1px solid var(--line);background:#111b2b;border-radius:999px;color:#c8d5e5;font-size:.86rem}.chip strong{color:#fff}.timer{font-variant-numeric:tabular-nums;font-weight:800;letter-spacing:.02em}.timer.warn{color:var(--warn)}.timer.danger{color:var(--danger)}
.test-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:18px;align-items:start}.test-sidebar{position:sticky;top:84px}.question-nav{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.qnav{aspect-ratio:1;border:1px solid var(--line);background:#111b2b;color:#cbd5e1;border-radius:9px}.qnav.done{background:#12352f;border-color:#25685d;color:#b7f7e9}.qnav.current{outline:2px solid var(--indigo);outline-offset:1px}.qnav.flagged::after{content:"•";color:var(--warn);margin-left:2px}
.question-card{padding:24px}.question-title{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:18px}.question-title h2{font-size:1.15rem;margin:0}.question-meta{color:var(--muted);font-size:.84rem}.choice-list{display:grid;gap:10px}.choice{display:flex;align-items:center;gap:12px;border:1px solid var(--line);background:#0f1929;padding:13px 14px;border-radius:12px;cursor:pointer}.choice:hover{border-color:#3f5e75}.choice input{accent-color:var(--teal-2)}.choice-letter{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:#1c293d;font-weight:800}.choice:has(input:checked){border-color:#2a8178;background:#102a29}.choice:has(input:checked) .choice-letter{background:#164e49;color:#ccfbf1}
.open-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.field-group label{display:block;margin-bottom:7px;color:#cbd5e1;font-weight:700}.math-wrap{border:1px solid var(--line);border-radius:12px;background:#0c1625;padding:8px 11px;min-height:57px}.math-wrap:focus-within{border-color:#4b8f8b;box-shadow:0 0 0 3px rgba(45,212,191,.08)}math-field{width:100%;background:transparent;border:0;color:#f8fafc;font-size:1.25rem;min-height:38px;--caret-color:#5eead4;--selection-background-color:rgba(94,234,212,.18)}
.q-actions{display:flex;justify-content:space-between;gap:12px;margin-top:22px}.q-actions .right{display:flex;gap:9px}.progress{height:8px;background:#142032;border-radius:99px;overflow:hidden}.progress span{display:block;height:100%;background:linear-gradient(90deg,#2dd4bf,#818cf8);border-radius:inherit}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.form-group{display:grid;gap:6px}.form-group.full{grid-column:1/-1}.form-group label{font-weight:700;font-size:.9rem}.input{width:100%;border:1px solid var(--line);background:#0e1828;color:#f8fafc;border-radius:11px;padding:12px 13px;outline:none}.input:focus{border-color:#4b8f8b;box-shadow:0 0 0 3px rgba(45,212,191,.08)}.helper{color:var(--muted);font-size:.8rem}
.result-hero{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}.result-box{padding:22px;border:1px solid var(--line);background:var(--panel);border-radius:15px}.result-box span{color:var(--muted);font-size:.84rem}.result-box strong{display:block;margin-top:6px;font-size:2rem}.level-badge{display:inline-flex!important;width:auto;padding:3px 10px;border-radius:999px;background:#15352f;color:#a7f3d0;font-size:1.2rem!important}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px}.table{width:100%;border-collapse:collapse;min-width:680px}.table th,.table td{padding:13px 14px;border-bottom:1px solid var(--line);text-align:left}.table th{background:#101b2c;color:#d6e1ef;font-size:.82rem}.table td{color:#c7d2e0}.table tr:last-child td{border-bottom:0}
.answer-list{display:grid;gap:9px}.answer-row{display:grid;grid-template-columns:74px 1fr;gap:14px;align-items:center;padding:12px 14px;border:1px solid var(--line);background:#0f1928;border-radius:12px}.answer-row strong{color:#a7f3d0}.answer-parts{display:flex;gap:18px;flex-wrap:wrap}.answer-part span{color:var(--muted);margin-right:6px}
.empty{padding:38px;text-align:center;border:1px dashed #33445d;border-radius:15px;color:var(--muted)}
.skeleton{height:110px;border-radius:14px;background:linear-gradient(90deg,#111827,#172236,#111827);background-size:200% 100%;animation:shine 1.4s infinite}@keyframes shine{to{background-position:-200% 0}}
.site-footer{width:min(var(--max),calc(100% - 32px));margin:0 auto;padding:22px 0 34px;border-top:1px solid rgba(148,163,184,.12);display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:.82rem}.site-footer strong{color:#dbe7f5}.footer-note{text-align:right}
.toast-region{position:fixed;right:18px;bottom:18px;z-index:100;display:grid;gap:9px;max-width:min(420px,calc(100vw - 36px))}.toast{background:#172236;border:1px solid #31435f;border-radius:12px;padding:12px 14px;box-shadow:var(--shadow);color:#e2e8f0}.toast.error{border-color:#713645}.toast.success{border-color:#2b6b59}
.modal-backdrop{position:fixed;inset:0;z-index:90;background:rgba(2,6,23,.75);display:grid;place-items:center;padding:20px}.modal-backdrop[hidden]{display:none}.modal{width:min(620px,100%);max-height:88vh;overflow:auto;border:1px solid var(--line);background:#0f172a;border-radius:18px;padding:24px;box-shadow:var(--shadow)}.modal h2{margin-top:0}.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:22px}
.kbd{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#1b2739;border:1px solid #34445d;padding:2px 6px;border-radius:6px;font-size:.82em}
.admin-kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.admin-login{width:min(470px,100%);margin:8vh auto}.muted{color:var(--muted)}.text-success{color:var(--success)}.text-danger{color:var(--danger)}.text-warn{color:var(--warn)}
@media(max-width:900px){.hero{grid-template-columns:1fr}.grid-3,.grid-4{grid-template-columns:1fr 1fr}.variant-grid{grid-template-columns:repeat(4,1fr)}.test-layout{grid-template-columns:1fr}.test-sidebar{position:static}.question-nav{grid-template-columns:repeat(9,1fr)}.admin-kpis{grid-template-columns:1fr 1fr}}
@media(max-width:700px){.site-header{padding-inline:16px}.nav-toggle{display:block}.main-nav{position:absolute;top:66px;left:12px;right:12px;display:none;flex-direction:column;align-items:stretch;padding:10px;background:#0f172a;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}.main-nav.open{display:flex}.main-nav.always-visible{position:static;display:flex;flex-direction:row;padding:0;background:transparent;border:0;box-shadow:none}.brand-copy small{display:none}main{width:min(100% - 22px,var(--max));padding-top:20px}.hero-copy{padding:27px}.hero-card{padding:20px}.grid-3,.grid-4{grid-template-columns:1fr}.variant-grid{grid-template-columns:repeat(3,1fr)}.question-nav{grid-template-columns:repeat(7,1fr)}.open-grid,.form-grid,.result-hero{grid-template-columns:1fr}.form-group.full{grid-column:auto}.site-footer{flex-direction:column}.footer-note{text-align:left}.q-actions{flex-direction:column}.q-actions .right{display:grid;grid-template-columns:1fr 1fr}.q-actions>.btn{width:100%}}
@media(max-width:420px){.variant-grid{grid-template-columns:repeat(2,1fr)}.question-nav{grid-template-columns:repeat(6,1fr)}.hero-actions .btn{width:100%}.admin-kpis{grid-template-columns:1fr}}