*{box-sizing:border-box}
:root{--primary:#b91c1c;--primary-dark:#991b1b;--bg:#f4f6f8;--text:#1f2937;--muted:#6b7280;--border:#e5e7eb;--green:#15803d;--orange:#d97706}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text)}
button,input,select{font:inherit}
button{cursor:pointer}
.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:linear-gradient(135deg,#fef2f2,#f3f4f6)}
.login-card{width:min(620px,100%);background:#fff;border-radius:18px;padding:34px;box-shadow:0 15px 45px rgba(0,0,0,.10)}
.brand,.result-header{display:flex;gap:15px;align-items:center;margin-bottom:25px}
.brand-mark{width:54px;height:54px;border-radius:14px;background:var(--primary);color:#fff;display:grid;place-items:center;font-weight:800;font-size:20px}
.brand h1,.result-header h1{font-size:20px;margin:0 0 5px}
.brand p,.result-header p{margin:0;color:var(--muted)}
.exam-info{background:#fef2f2;border:1px solid #fecaca;border-radius:12px;padding:18px;margin-bottom:22px}
.exam-info h2{margin:0 0 8px;font-size:20px}.exam-info p{margin:0 0 10px;color:#4b5563}
.exam-info li{margin:7px 0;color:#374151}
label{display:block;font-weight:700;margin:15px 0 7px}
input,select{width:100%;padding:13px 14px;border:1px solid #d1d5db;border-radius:9px;outline:none;background:#fff}
input:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(185,28,28,.1)}
.btn-primary,.btn-secondary,.btn-finish{border:0;border-radius:9px;padding:12px 18px;font-weight:700}
.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}
.btn-secondary{background:#eef2f7;color:#374151}.btn-secondary:hover{background:#e5e7eb}
.btn-finish{background:#7f1d1d;color:#fff;width:100%}.btn-finish:hover{background:#991b1b}
form .btn-primary{width:100%;margin-top:22px}
.topbar{height:70px;background:#fff;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 28px;position:sticky;top:0;z-index:5}
.topbar strong{display:block}.topbar span{font-size:13px;color:var(--muted)}
.timer-wrap{text-align:right}.timer-wrap span{display:block;font-size:12px;color:var(--muted)}.timer-wrap strong{font-size:22px;color:var(--primary)}
.exam-layout{max-width:1250px;margin:25px auto;padding:0 20px;display:grid;grid-template-columns:1fr 290px;gap:22px}
.question-card,.navigator{background:#fff;border:1px solid var(--border);border-radius:15px;padding:24px;box-shadow:0 5px 18px rgba(0,0,0,.04)}
.question-head{display:flex;justify-content:space-between;gap:10px;border-bottom:1px solid var(--border);padding-bottom:15px;margin-bottom:20px}
.question-head span:last-child{color:var(--muted);font-size:13px}
.stimulus{background:#f8fafc;border-left:4px solid var(--primary);padding:15px;margin-bottom:18px;line-height:1.6;border-radius:5px}
.question-text{font-size:17px;line-height:1.7;font-weight:600;margin-bottom:20px}
.option{display:flex;gap:12px;align-items:flex-start;border:1px solid #dfe3e8;padding:13px;border-radius:10px;margin:10px 0;transition:.15s}
.option:hover{background:#fafafa;border-color:#b91c1c}.option input{width:auto;margin-top:4px}.option label{margin:0;font-weight:400;line-height:1.5;cursor:pointer;flex:1}
.question-actions{display:flex;justify-content:space-between;margin-top:28px;padding-top:18px;border-top:1px solid var(--border)}
.navigator h3{margin-top:0}.number-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-bottom:20px}
.num-btn{border:1px solid #d1d5db;background:#fff;border-radius:7px;padding:9px 0;font-weight:700}
.num-btn.current{border:2px solid var(--primary);color:var(--primary)}.num-btn.answered{background:#dcfce7;border-color:#86efac;color:#166534}
.legend{display:grid;gap:8px;font-size:12px;color:var(--muted);margin-bottom:20px}.legend span{display:flex;align-items:center;gap:8px}
.dot{width:11px;height:11px;border-radius:50%;background:#e5e7eb;display:inline-block}.dot.answered{background:#22c55e}.dot.current{background:var(--primary)}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.45);display:grid;place-items:center;padding:20px;z-index:20}.hidden{display:none!important}
.modal-box{background:#fff;border-radius:15px;padding:25px;width:min(430px,100%)}.modal-box h3{margin-top:0}.modal-actions{display:flex;gap:10px;margin-top:20px}.modal-actions button{flex:1}
.result-page{min-height:100vh;padding:35px 20px}.result-card{max-width:850px;margin:auto;background:#fff;border-radius:18px;padding:30px;box-shadow:0 10px 35px rgba(0,0,0,.08)}
.result-header{border-bottom:1px solid var(--border);padding-bottom:20px}
#identity{background:#f8fafc;border-radius:10px;padding:15px;margin-bottom:20px;line-height:1.8}
.score-box{text-align:center;background:#fef2f2;border:1px solid #fecaca;border-radius:15px;padding:22px}.score-box span{display:block;color:var(--muted)}.score-box strong{display:block;font-size:64px;color:var(--primary);line-height:1.1}.score-box small{font-weight:700;font-size:15px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:20px 0}.stats div{background:#f8fafc;padding:17px;border-radius:10px;text-align:center}.stats strong{display:block;font-size:25px}.stats span{font-size:12px;color:var(--muted)}
.result-actions{display:flex;gap:10px}.result-actions button{flex:1}
.review{margin-top:28px;border-top:1px solid var(--border);padding-top:20px}.review h2{font-size:20px}
.review-item{border:1px solid var(--border);border-radius:10px;padding:16px;margin:12px 0}.review-item.correct{border-left:5px solid var(--green)}.review-item.wrong{border-left:5px solid var(--primary)}
.review-item h4{margin:0 0 10px}.review-item p{line-height:1.6}.review-answer{font-weight:700}.correct-text{color:var(--green)}.wrong-text{color:var(--primary)}
code{background:#f3f4f6;padding:2px 5px;border-radius:4px}
@media(max-width:850px){.exam-layout{grid-template-columns:1fr}.navigator{order:-1}.number-grid{grid-template-columns:repeat(10,1fr)}}
@media(max-width:560px){.login-card,.question-card,.navigator,.result-card{padding:18px}.topbar{padding:0 15px}.topbar strong{font-size:14px}.timer-wrap strong{font-size:18px}.number-grid{grid-template-columns:repeat(5,1fr)}.stats{grid-template-columns:repeat(2,1fr)}.question-actions,.result-actions{gap:8px}.question-actions button,.result-actions button{padding:10px 12px}}