:root{--bg: #f0f4ff;--bg-gradient: linear-gradient(160deg, #e8f0ff 0%, #fdf2ff 60%, #fff7e6 100%);--card: #ffffff;--text: #2d3250;--muted: #7a7f9d;--primary: #5b6cff;--primary-dark: #4555e8;--success: #2eb872;--success-bg: #e3f8ee;--error: #e85d5d;--error-bg: #fdecec;--warn: #f5a623;--radius: 18px;--shadow: 0 4px 20px rgba(80, 90, 180, .12);font-size:16px}*{box-sizing:border-box}body{margin:0;font-family:Nunito,Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg-gradient);background-attachment:fixed;color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased}h1,h2,h3{font-weight:800;margin:0 0 .5em}a{color:var(--primary)}.container{max-width:640px;margin:0 auto;padding:1.25rem}.container.wide{max-width:1000px}.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.5rem;margin-bottom:1rem}.btn{display:inline-block;border:none;border-radius:14px;background:var(--primary);color:#fff;font-family:inherit;font-size:1.05rem;font-weight:700;padding:.8rem 1.6rem;cursor:pointer;transition:transform .1s,background .15s;text-decoration:none;text-align:center}.btn:hover{background:var(--primary-dark)}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.secondary{background:#eceefc;color:var(--primary-dark)}.btn.danger{background:var(--error)}.btn.big{font-size:1.3rem;padding:1rem 2.2rem;width:100%}input[type=text],input[type=password],input[type=email],input[type=number],textarea,select{font-family:inherit;font-size:1.1rem;padding:.7rem .9rem;border:2px solid #dde1f4;border-radius:12px;background:#fafbff;color:var(--text);width:100%}input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary)}label{display:block;font-weight:700;margin:.8rem 0 .3rem;font-size:.95rem}.field-row{display:flex;gap:.75rem;align-items:center}.error-msg{background:var(--error-bg);color:var(--error);border-radius:12px;padding:.7rem 1rem;font-weight:700;margin:.8rem 0}.success-msg{background:var(--success-bg);color:var(--success);border-radius:12px;padding:.7rem 1rem;font-weight:700;margin:.8rem 0}.question{font-size:clamp(1.4rem,4.5vw,2rem);font-weight:800;text-align:center;white-space:pre-line;margin:1.2rem 0;line-height:1.5}.question.long{font-size:clamp(1.05rem,3vw,1.3rem);text-align:left;font-weight:600}.answer-input{font-size:1.5rem!important;text-align:center;max-width:280px;margin:0 auto}.progress-bar{height:12px;background:#e3e7fb;border-radius:999px;overflow:hidden;margin:.5rem 0 1rem}.progress-bar>div{height:100%;background:linear-gradient(90deg,var(--primary),#9b6cff);border-radius:999px;transition:width .4s ease}.choice-btns{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap}.choice-btns .btn{min-width:80px;font-size:1.4rem}.frac-input{display:flex;flex-direction:column;align-items:center;gap:.4rem;width:120px;margin:0 auto}.frac-input hr{width:100%;border:none;border-top:3px solid var(--text);margin:0}.stat-chips{display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap}.chip{background:#fff;border-radius:999px;box-shadow:var(--shadow);padding:.45rem 1rem;font-weight:800;font-size:.95rem}.avatar-grid{display:flex;flex-wrap:wrap;gap:1rem;justify-content:center}.avatar-btn{display:flex;flex-direction:column;align-items:center;gap:.3rem;background:var(--card);border:3px solid transparent;border-radius:var(--radius);box-shadow:var(--shadow);padding:1rem 1.4rem;font-family:inherit;font-size:1rem;font-weight:800;color:var(--text);cursor:pointer;transition:transform .12s}.avatar-btn:hover{transform:translateY(-3px)}.avatar-btn.selected{border-color:var(--primary)}.avatar-btn .emoji{font-size:3rem;line-height:1}.pin-pad{display:grid;grid-template-columns:repeat(3,1fr);gap:.6rem;max-width:260px;margin:1rem auto}.pin-pad button{font-family:inherit;font-size:1.5rem;font-weight:800;padding:.9rem;border:none;border-radius:14px;background:#eceefc;color:var(--text);cursor:pointer}.pin-pad button:active{background:var(--primary);color:#fff}.pin-dots{display:flex;gap:.6rem;justify-content:center;margin:.8rem 0}.pin-dots span{width:16px;height:16px;border-radius:50%;background:#d8dcf2}.pin-dots span.filled{background:var(--primary)}.admin-nav{display:flex;gap:.4rem;flex-wrap:wrap;margin-bottom:1.2rem}.admin-nav a{text-decoration:none;font-weight:700;padding:.5rem 1rem;border-radius:999px;color:var(--text);background:#ffffffb3}.admin-nav a.active{background:var(--primary);color:#fff}table{width:100%;border-collapse:collapse;font-size:.95rem}th,td{text-align:left;padding:.55rem .6rem;border-bottom:1px solid #edeffa}th{color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.04em}.rate-good{color:var(--success);font-weight:800}.rate-mid{color:var(--warn);font-weight:800}.rate-bad{color:var(--error);font-weight:800}.topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:.5rem}.topic-item{display:flex;align-items:center;gap:.5rem;background:#f6f7fe;border-radius:10px;padding:.45rem .6rem}.topic-item input[type=checkbox]{width:20px;height:20px;accent-color:var(--primary)}.topic-item select{width:auto;margin-left:auto;padding:.2rem .4rem;font-size:.85rem}.feedback-correct{text-align:center;font-size:1.4rem;font-weight:800;color:var(--success)}.feedback-wrong{text-align:center;font-size:1.2rem;font-weight:800;color:var(--error)}.solution-box{background:#f6f7fe;border-left:5px solid var(--primary);border-radius:10px;padding:.9rem 1rem;margin-top:1rem;text-align:left}.confetti-piece{position:fixed;top:-20px;width:12px;height:12px;border-radius:3px;z-index:999;animation:confetti-fall linear forwards;pointer-events:none}@keyframes confetti-fall{to{transform:translateY(110vh) rotate(720deg)}}@media(max-width:520px){.container{padding:.8rem}.card{padding:1.1rem}}