:root{
  --primary:#0f6b4f;--primary-dark:#084a37;--accent:#f4b400;--danger:#b42318;
  --success:#207a3c;--bg:#f3f7f5;--card:#fff;--text:#17241f;--muted:#64736d;
  --border:#dbe6e1;--shadow:0 12px 32px rgba(15,107,79,.10)
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,Helvetica,sans-serif;background:linear-gradient(135deg,#eef7f3,#fafcfb 65%,#fff9e5);color:var(--text);min-height:100vh}
a{color:var(--primary);text-decoration:none}
.topbar{background:linear-gradient(135deg,var(--primary),var(--primary-dark));padding:11px 4%;display:flex;align-items:center;justify-content:space-between;gap:18px;color:#fff;box-shadow:0 3px 16px rgba(0,0,0,.15)}
.brand{display:flex;align-items:center;gap:10px;color:#fff}.brand img{width:58px;height:58px;object-fit:contain}.brand span{display:flex;flex-direction:column}.brand strong{font-size:17px}.brand small{opacity:.82;margin-top:3px}
.topbar nav{display:flex;gap:13px;align-items:center;flex-wrap:wrap}.topbar nav a,.nav-name{color:#fff;font-size:14px}.topbar nav a{padding:7px 9px;border-radius:8px}.topbar nav a:hover{background:rgba(255,255,255,.12)}
.container{width:min(1180px,94%);margin:26px auto;min-height:calc(100vh - 155px)}
.footer{text-align:center;padding:18px;color:var(--muted);font-size:12px}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);padding:24px;margin-bottom:20px}
.card h1,.card h2,.card h3{margin-top:0}
.login-wrap{max-width:470px;margin:30px auto}.login-logo{width:135px;display:block;margin:0 auto 14px}
.field{margin-bottom:14px}.field label{display:block;font-weight:700;margin-bottom:6px}.field input,.field select,.field textarea{width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:9px;background:#fff}.field textarea{min-height:130px;resize:vertical;line-height:1.55}.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(15,107,79,.12)}
.btn{border:0;border-radius:9px;padding:10px 14px;font-weight:700;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:7px}.btn-primary{background:var(--primary);color:#fff}.btn-secondary{background:#edf4f1;color:var(--primary-dark);border:1px solid var(--border)}.btn-danger{background:var(--danger);color:#fff}.btn-warning{background:var(--accent);color:#312700}.btn-block{width:100%}.btn-small{padding:7px 9px;font-size:12px}
.alert{padding:12px 14px;border-radius:9px;margin-bottom:16px;border-left:4px solid}.alert-success{background:#eaf6ee;border-color:var(--success)}.alert-danger{background:#fdecec;border-color:var(--danger)}.alert-warning{background:#fff7df;border-color:var(--accent)}
.notice{padding:13px 14px;background:#fff8df;border-left:4px solid var(--accent);border-radius:8px;line-height:1.55}
.grid{display:grid;gap:18px}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.stat{padding:18px;border:1px solid var(--border);border-radius:13px;background:#f6f9f8}.stat strong{display:block;font-size:28px;color:var(--primary);margin-bottom:4px}.stat span{color:var(--muted)}
table{border-collapse:collapse;width:100%;min-width:780px}th,td{padding:10px;border-bottom:1px solid var(--border);text-align:left;font-size:14px;vertical-align:top}th{background:#eef5f2;color:var(--primary-dark)}.table-wrap{overflow:auto}
.badge{display:inline-block;padding:5px 8px;border-radius:999px;font-size:12px;font-weight:700}.badge-success{background:#e6f5eb;color:#176b32}.badge-danger{background:#fde8e8;color:#9e1c1c}.badge-warning{background:#fff3cf;color:#705500}.badge-info{background:#e8f1ff;color:#245696}
.actions{display:flex;gap:8px;flex-wrap:wrap}.toolbar{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:16px}
.exam-top{display:flex;justify-content:space-between;align-items:center;gap:15px;flex-wrap:wrap;margin-bottom:18px}.timer{font-size:25px;background:#1f2937;color:#fff;border-radius:10px;padding:10px 15px;font-weight:800}.timer.danger{background:var(--danger)}
.exam-layout{display:grid;grid-template-columns:1fr 310px;gap:18px}.question-panel{min-height:440px}.question-section{display:none}.question-section.active{display:block}.question-title{color:var(--primary);font-weight:800;margin-bottom:10px}.question-text{font-size:20px;line-height:1.55;margin-bottom:18px}.option{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--border);padding:12px;border-radius:11px;margin:9px 0;cursor:pointer}.option:hover{background:#f4faf7;border-color:var(--primary)}.option input{margin-top:3px}
.essay-box{width:100%;min-height:230px;padding:13px;border:1px solid var(--border);border-radius:11px;font:inherit;line-height:1.6}.essay-meta{font-size:12px;color:var(--muted);margin-top:6px}
.exam-nav{position:sticky;top:15px;height:max-content}.number-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.number-btn{aspect-ratio:1/1;border:1px solid var(--border);background:#fff;border-radius:7px;cursor:pointer;font-weight:700;color:var(--muted)}.number-btn.current{outline:3px solid rgba(244,180,0,.45);border-color:var(--accent)}.number-btn.answered{background:#dff3e9;color:var(--primary-dark);border-color:#78ba9e}.progress{height:9px;background:#e3ece8;border-radius:99px;overflow:hidden;margin:9px 0 14px}.progress span{height:100%;display:block;background:var(--primary);width:0}
.question-actions{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:22px}
.result-score{width:160px;height:160px;border-radius:50%;border:14px solid #dfece7;margin:15px auto;display:grid;place-items:center;text-align:center}.result-score strong{font-size:40px;color:var(--primary)}
.review-answer{white-space:pre-wrap;background:#f5f8f7;padding:12px;border-radius:9px;line-height:1.55}.review-item{padding:15px;border:1px solid var(--border);border-radius:12px;margin-bottom:13px}.small{font-size:12px;color:var(--muted);line-height:1.5}
.inline-form{display:inline}.pagination{display:flex;gap:6px;flex-wrap:wrap;margin-top:15px}.pagination a,.pagination span{padding:7px 10px;border:1px solid var(--border);border-radius:7px;background:#fff}.pagination .active{background:var(--primary);color:#fff}
@media(max-width:900px){.exam-layout,.grid-4,.grid-2{grid-template-columns:1fr}.exam-nav{position:static}.topbar{align-items:flex-start}.brand small{display:none}}
@media(max-width:600px){.container{width:94%;margin:15px auto}.card{padding:17px}.brand img{width:48px;height:48px}.brand strong{font-size:14px}.topbar nav{gap:4px}.topbar nav a{font-size:12px}.question-text{font-size:18px}}