:root{--bg:#f6f8fb;--card:#ffffff;--text:#132238;--muted:#64748b;--primary:#174ea6;--primary-dark:#0b3577;--accent:#f6b500;--success:#0f8a4b;--danger:#c62828;--border:#dbe3ef}*{box-sizing:border-box}body,html{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:Inter,Arial,Helvetica,sans-serif;-webkit-text-size-adjust:100%}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit;font-size:16px}a,button{touch-action:manipulation}.math-bg{min-height:100vh;background:radial-gradient(circle at top left,rgba(246,181,0,.22),transparent 30%),radial-gradient(circle at bottom right,rgba(23,78,166,.22),transparent 34%),linear-gradient(135deg,rgba(255,255,255,.92),rgba(232,239,255,.88)),repeating-linear-gradient(45deg,transparent,transparent 34px,rgba(23,78,166,.05) 0,rgba(23,78,166,.05) 36px)}.container{width:min(1120px,calc(100% - 32px));margin:0 auto}.centered{display:flex;align-items:center;justify-content:center;padding:32px 0}.card{background:var(--card);border:1px solid var(--border);border-radius:24px;box-shadow:0 22px 70px rgba(15,23,42,.1)}.card-pad{padding:28px}.grid{display:grid;grid-gap:18px;gap:18px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}.flex{display:flex;gap:12px;align-items:center}.between{justify-content:space-between}.wrap{flex-wrap:wrap}h1,h2,h3{margin:0 0 12px;line-height:1.1}h1{font-size:clamp(2rem,4vw,4.2rem)}h2{font-size:clamp(1.5rem,2.5vw,2.4rem)}p{line-height:1.65}.muted{color:var(--muted)}.small{font-size:.9rem}.btn{border:0;border-radius:14px;padding:12px 18px;font-weight:800;cursor:pointer;display:inline-flex;justify-content:center;align-items:center;gap:8px;min-height:46px}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{color:white;background:linear-gradient(135deg,var(--primary),var(--primary-dark))}.btn-accent{color:#1a1a1a;background:linear-gradient(135deg,#ffe089,var(--accent))}.btn-light{background:#eef4ff;color:var(--primary-dark)}.btn-danger{background:var(--danger);color:white}.btn-success{background:var(--success);color:white}.input,.select,.textarea{width:100%;border:1px solid var(--border);border-radius:14px;padding:12px 14px;background:white;color:var(--text);outline:none;min-height:46px}.textarea{min-height:110px;resize:vertical}.input:focus,.select:focus,.textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(23,78,166,.14)}.label{display:block;font-weight:800;margin:0 0 6px}.alert{border-radius:14px;padding:12px 14px;margin:12px 0;border:1px solid}.alert-error{color:#8a1111;border-color:#ffcdd2;background:#fff1f1}.alert-success{color:#075d33;border-color:#b7efcd;background:#f0fff5}.alert-info{color:#174ea6;border-color:#b8d1ff;background:#f1f6ff}.nav{padding:18px 0}.badge{display:inline-flex;align-items:center;border-radius:999px;padding:6px 10px;font-size:.82rem;font-weight:800;background:#eef4ff;color:var(--primary-dark)}.badge-good{background:#e8fff1;color:var(--success)}.badge-warn{background:#fff7dc;color:#7a5100}.progress{height:12px;width:100%;background:#e6edf7;border-radius:999px;overflow:hidden}.progress>div{height:100%;background:linear-gradient(90deg,var(--accent),var(--primary));transition:width .2s ease}.table-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:16px;-webkit-overflow-scrolling:touch}table{width:100%;border-collapse:collapse;background:white}td,th{text-align:left;padding:12px;border-bottom:1px solid var(--border);vertical-align:top}th{background:#f7f9fd;font-size:.85rem;text-transform:uppercase;letter-spacing:.04em}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.tab{border:1px solid var(--border);background:white;color:var(--text);padding:10px 14px;border-radius:999px;cursor:pointer;font-weight:800;min-width:44px;min-height:44px}.tab.active{background:var(--primary);color:white;border-color:var(--primary)}.option{display:block;width:100%;padding:16px;border:2px solid var(--border);border-radius:18px;margin:10px 0;background:white;cursor:pointer;text-align:left;line-height:1.45;min-height:56px}.option.selected{border-color:var(--primary);background:#eef4ff}.banner-image,.question-image{max-width:100%;border-radius:18px;border:1px solid var(--border)}.proctor{position:fixed;right:14px;top:14px;z-index:20;max-width:320px;background:rgba(255,255,255,.95);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:18px;padding:12px;box-shadow:0 10px 40px rgba(15,23,42,.15)}.test-question-text{font-size:clamp(1.1rem,4vw,1.35rem);font-weight:800;white-space:pre-wrap}.question-nav{max-height:170px;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:4px}.sticky-test-actions{position:-webkit-sticky;position:sticky;bottom:0;background:rgba(255,255,255,.96);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);padding-top:12px}@media (max-width:980px){.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width:780px){.container{width:min(100% - 18px,1120px)}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.card{border-radius:18px}.card-pad{padding:18px}.proctor{position:static;max-width:none;margin:8px auto;width:calc(100% - 18px)}.btn{width:100%}.flex.between{align-items:stretch}.option{font-size:1rem;padding:16px 14px}td,th{padding:10px}}@media (max-width:520px){.container{width:calc(100% - 12px)}.card-pad{padding:14px}.nav{padding:10px 0}.tab{min-width:42px;padding:10px 12px}.question-nav{justify-content:flex-start!important}}@media print{.no-print{display:none!important}body{background:white}.card{box-shadow:none;border:0}}