:root{--primary:#5b5cff;--primary2:#00b4d8;--dark:#111827;--muted:#6b7280;--bg:#f4f7fb;--card:#ffffff;--line:#e8edf5;--success:#16a34a;--danger:#ef4444;--warning:#f59e0b;}
*{box-sizing:border-box} body{background:var(--bg);font-family:Inter,system-ui,-apple-system,Segoe UI,Arial,sans-serif;color:#1f2937} a{text-decoration:none}.hero{min-height:88vh;background:linear-gradient(135deg,#eef2ff,#ecfeff);position:relative;overflow:hidden}.hero:before{content:"";position:absolute;right:-110px;top:-140px;width:420px;height:420px;background:linear-gradient(135deg,var(--primary),var(--primary2));border-radius:50%;opacity:.16}.nav-glass{backdrop-filter:blur(15px);background:rgba(255,255,255,.75);border-bottom:1px solid var(--line)}.btn-gradient{border:0;color:#fff;background:linear-gradient(135deg,var(--primary),var(--primary2));box-shadow:0 12px 30px rgba(91,92,255,.25)}.soft-card,.auth-card,.data-card{background:var(--card);border:1px solid var(--line);border-radius:24px;box-shadow:0 18px 45px rgba(15,23,42,.06)}.auth-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;background:radial-gradient(circle at top right,#dbeafe,transparent 34%),linear-gradient(135deg,#f8fafc,#eef2ff)}.auth-card{max-width:480px;width:100%;padding:34px}.form-control,.form-select{border-radius:14px;border-color:#dbe3ef;padding:.75rem 1rem}.app-shell{display:flex;min-height:100vh}.sidebar{width:270px;background:#0f172a;color:#fff;padding:20px 16px;position:fixed;left:0;top:0;bottom:0;overflow:auto}.student-sidebar{background:linear-gradient(180deg,#111827,#1e1b4b)}.brand{display:flex;gap:12px;align-items:center;margin-bottom:28px}.brand-icon{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary2));font-weight:800}.brand small{display:block;color:#cbd5e1;font-size:12px}.sidebar nav a{display:flex;align-items:center;gap:12px;color:#cbd5e1;padding:12px 14px;border-radius:14px;margin:4px 0}.sidebar nav a:hover,.sidebar nav a.active{background:rgba(255,255,255,.11);color:#fff}.main-content{margin-left:270px;width:calc(100% - 270px);padding:26px}.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:22px}.stat-card{border-radius:22px;padding:22px;color:#fff;overflow:hidden;position:relative}.stat-card:after{content:"";position:absolute;right:-30px;top:-30px;width:120px;height:120px;border-radius:50%;background:rgba(255,255,255,.18)}.g1{background:linear-gradient(135deg,#6366f1,#06b6d4)}.g2{background:linear-gradient(135deg,#16a34a,#22c55e)}.g3{background:linear-gradient(135deg,#f59e0b,#ef4444)}.g4{background:linear-gradient(135deg,#9333ea,#ec4899)}.table{vertical-align:middle}.table thead th{font-size:13px;text-transform:uppercase;color:#64748b;background:#f8fafc}.action-btn{border-radius:12px}.exam-body{background:#eef2f7}.exam-shell{min-height:100vh}.exam-header{position:sticky;top:0;z-index:10;background:#111827;color:#fff;padding:14px 20px;display:flex;align-items:center;justify-content:space-between}.timer-pill{background:#fee2e2;color:#991b1b;border-radius:999px;padding:10px 18px;font-weight:800}.question-card{background:#fff;border-radius:24px;border:1px solid var(--line);padding:28px;box-shadow:0 16px 40px rgba(15,23,42,.06)}.option-box{display:block;border:1px solid #dbe3ef;border-radius:16px;padding:14px 16px;margin:10px 0;cursor:pointer;background:#fbfdff}.option-box:hover{border-color:var(--primary);background:#f5f7ff}.pager-card{background:#fff;border-radius:24px;border:1px solid var(--line);padding:18px}.qbtn{width:42px;height:42px;border:0;border-radius:12px;margin:5px;font-weight:700}.q-not{background:#e5e7eb}.q-ans{background:#bbf7d0}.q-review{background:#ddd6fe}.q-current{outline:3px solid #111827}@media(max-width:900px){.sidebar{position:relative;width:100%;height:auto}.app-shell{display:block}.main-content{margin-left:0;width:100%}.topbar{display:block}.exam-header{gap:12px;flex-wrap:wrap}}