:root{
  --primary:#0b4ea2; --secondary:#0ea5e9; --accent:#16a34a; --bg:#f3f8ff;
  --text:#1f2937; --muted:#6b7280; --danger:#dc2626; --card:#ffffff;
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:
radial-gradient(circle at top left, rgba(11,78,162,.10), transparent 25%),
radial-gradient(circle at top right, rgba(14,165,233,.08), transparent 20%), var(--bg);color:var(--text)}
a{text-decoration:none;color:inherit}
.container{max-width:1240px;margin:0 auto;padding:0 20px}
.page-space{padding:24px 20px 40px}
.site-header{background:rgba(255,255,255,.88);backdrop-filter:blur(16px);position:sticky;top:0;z-index:20;border-bottom:1px solid #e5e7eb}
.top-row{padding:16px 20px}
.brand-row{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.banner-box,.circle-box{background:#fff;border:1px solid #e5e7eb;box-shadow:0 8px 24px rgba(15,23,42,.08);display:flex;align-items:center;justify-content:center;overflow:hidden}
.banner-box{width:245px;height:65px;border-radius:20px;background:0; color:#fff;font-weight:700}
.banner-box img,.circle-box img{width:100%;height:100%;object-fit:cover}
.circle-box{width:62px;height:62px;border-radius:20px;font-size:12px}
.brand-name{font-size:28px;font-weight:900;letter-spacing:.04em}
.brand-sub{color:var(--muted);font-size:14px}
.divider{height:1px;background:#dbe3ee}
.nav-row{padding:12px 20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;align-items:center}
.main-nav,.right-nav{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.main-nav a{font-weight:700;padding:10px 14px;border-radius:14px}
.main-nav a:hover{background:#eef5ff}
.lang-switch{display:flex;border:1px solid #dbe3ee;border-radius:16px;overflow:hidden;background:#fff}
.lang-switch a{padding:10px 14px;font-weight:700}
.lang-switch a.active{background:var(--primary);color:#fff}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 18px;border-radius:16px;border:none;cursor:pointer;font-weight:700}
.btn-primary{background:var(--primary);color:#fff}
.btn-dark{background:#111827;color:#fff}
.btn-outline{background:#fff;border:1px solid #dbe3ee;color:#111827}
.btn-light{background:#fff;color:#111827}
.btn-outline-light{border:1px solid rgba(255,255,255,.35);color:#fff;background:transparent}
.btn-danger{background:#dc2626;color:#fff}
.btn-big{height:60px;font-size:20px}
.btn-sm{padding:8px 12px;border-radius:10px;font-size:12px}
.card,.form-card{background:rgba(255,255,255,.95);border:1px solid #e5e7eb;border-radius:28px;box-shadow:0 20px 60px rgba(15,23,42,.08);padding:28px;margin-bottom:20px}
.dark-card{background:linear-gradient(135deg,#0f172a 0%, #0b4ea2 45%, #0ea5e9 100%);color:#fff;border:none}
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:20px}
.hero-left h1{font-size:46px;line-height:1.1;margin:10px 0}
.hero-left p{font-size:18px;line-height:1.7;color:#e2e8f0}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:24px}
.meta-row{display:flex;gap:10px;flex-wrap:wrap}
.meta-row span,.tags span{padding:9px 12px;border-radius:999px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.16);font-size:13px}
.feature-card h3,.mini-card h3{margin-top:0}
.feature-list{margin:0;padding-left:18px;line-height:2}
.progress{height:12px;background:#e5edf8;border-radius:999px;overflow:hidden}
.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--secondary))}
.muted{color:var(--muted)}
.grid-form{display:grid;gap:16px}
.grid-form.two-col{grid-template-columns:repeat(2,1fr)}
.grid-form label{display:grid;gap:8px;font-weight:700;font-size:14px}
.grid-form input,.grid-form select,.grid-form textarea{width:100%;padding:14px 16px;border-radius:16px;border:1px solid #dbe3ee;background:#fff;font:inherit}
.grid-form textarea{min-height:120px;resize:vertical}
.full-width{grid-column:1/-1}
.center-card{max-width:640px;margin:0 auto 20px}
.large-card{max-width:1000px;margin:0 auto 20px}
.success-card{text-align:center}
.big-cred{font-size:28px;margin:14px 0}
.alert{padding:14px 18px;border-radius:16px;margin-bottom:16px;font-weight:700}
.alert.success{background:#ecfdf5;color:#166534;border:1px solid #bbf7d0}
.alert.error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.site-footer{border-top:1px solid #e5e7eb;background:#fff}
.footer-inner{padding:16px 20px;display:flex;justify-content:space-between;gap:16px;align-items:center;flex-wrap:wrap}
.usage-box{display:flex;gap:10px;align-items:center;background:#f8fafc;border:1px solid #e5e7eb;padding:10px 12px;border-radius:14px}
.usage-box select{padding:8px 10px;border-radius:10px;border:1px solid #dbe3ee}
.lang-gate{position:fixed;inset:0;z-index:60;background:
radial-gradient(circle at top, rgba(11,78,162,.25), transparent 28%),
radial-gradient(circle at bottom right, rgba(22,163,74,.12), transparent 24%),
linear-gradient(135deg, rgba(2,6,23,.97), rgba(15,23,42,.98));display:flex;align-items:center;justify-content:center;padding:20px}
.lang-gate-card{width:min(1200px,100%);min-height:620px;border-radius:34px;overflow:hidden;border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.06);backdrop-filter:blur(16px);display:grid;grid-template-columns:1.08fr .92fr;box-shadow:0 30px 90px rgba(0,0,0,.35)}
.lang-gate-left{padding:54px;color:#fff;background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.02))}
.lang-gate-left .small-top{font-size:12px;letter-spacing:.34em;color:#bfdbfe}
.lang-gate-left h1{font-size:58px;margin:16px 0 10px}
.lang-gate-left p{font-size:19px;line-height:1.8;color:#dbeafe}
.lang-gate-right{padding:54px;background:rgba(255,255,255,.08);display:flex;flex-direction:column;justify-content:center}
.lang-title{font-size:32px;font-weight:900;color:#fff}
.lang-text{margin-top:20px;background:#fff;border-radius:28px;padding:28px;line-height:1.8;font-size:18px}
.lang-actions{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:20px}
.grid-panels,.result-grid,.admin-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.stats-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.stats-cards>div{background:#f8fafc;border:1px solid #e5e7eb;border-radius:20px;padding:16px;display:grid;gap:8px}
.stats-cards strong{font-size:32px}
.result-status{padding:14px 18px;border-radius:18px;font-weight:700;margin:12px 0 18px}
.result-status.pass{background:#ecfdf5;color:#166534}
.result-status.fail{background:#fef2f2;color:#991b1b}
.cert-links{display:flex;gap:12px;flex-wrap:wrap}
.data-table{width:100%;border-collapse:collapse}
.data-table th,.data-table td{padding:14px;border-bottom:1px solid #e5e7eb;text-align:left;vertical-align:top}
.data-table th{background:#f8fafc}
.inline-form{display:inline}
.exam-body{user-select:none}
.exam-shell{max-width:980px;margin:0 auto}
.exam-card{background:#fff;padding:0;overflow:hidden}
.exam-top{padding:24px 28px;background:linear-gradient(90deg,var(--primary),var(--secondary));color:#fff;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.exam-badges{display:flex;gap:10px;flex-wrap:wrap}
.exam-badges span{padding:10px 14px;border-radius:14px;background:rgba(255,255,255,.16)}
.question-box{padding:28px}
.question-box h3{font-size:30px;line-height:1.45;margin-top:0}
.option-list{display:grid;gap:14px}
.option-btn{width:100%;text-align:left;padding:18px 20px;border-radius:22px;border:2px solid #dbe3ee;background:#fff;font-size:17px;font-weight:700;cursor:pointer;transition:.2s}
.option-btn:hover{background:#eff6ff;border-color:#93c5fd}
.option-btn.correct{background:#ecfdf5;border-color:#86efac;color:#166534}
.option-btn.wrong{background:#fef2f2;border-color:#fca5a5;color:#b91c1c}
.top-gap{margin-top:16px}
.admin-body{background:#0f172a}
.admin-wrap{display:grid;grid-template-columns:260px 1fr;min-height:100vh}
.admin-sidebar{background:#020617;color:#fff;padding:24px;position:sticky;top:0;height:100vh}
.admin-sidebar h2{margin-top:0}
.admin-sidebar nav{display:grid;gap:8px}
.admin-sidebar nav a{padding:12px 14px;border-radius:14px;color:#e5e7eb}
.admin-sidebar nav a:hover{background:rgba(255,255,255,.08)}
.admin-main{padding:24px;background:#f3f7fb}
.big-number{font-size:48px;font-weight:900}
@media (max-width: 980px){
  .hero,.grid-panels,.result-grid,.admin-grid,.lang-gate-card,.admin-wrap{grid-template-columns:1fr}
  .grid-form.two-col{grid-template-columns:1fr}
  .stats-cards{grid-template-columns:1fr}
  .lang-gate-left,.lang-gate-right{padding:28px}
  .lang-gate-left h1{font-size:40px}
  .question-box h3{font-size:22px}
}