:root{--navy:#172554;--blue:#2563eb;--cyan:#06b6d4;--green:#16a34a;--red:#dc2626;--amber:#d97706;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--bg:#f5f7fb;--card:#fff;--radius:20px;--shadow:0 14px 38px rgba(15,23,42,.08)}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,sans-serif;background:var(--bg);color:var(--ink)}a{text-decoration:none;color:inherit}.app-shell{display:flex;min-height:100vh}.sidebar{width:258px;position:fixed;inset:0 auto 0 0;background:linear-gradient(180deg,#0f1d48,#172554 55%,#0f172a);color:#fff;padding:18px 14px;z-index:30;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;padding:8px 10px 22px}.brand-mark{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#22d3ee,#2563eb);font-size:22px;font-weight:900;box-shadow:0 10px 25px rgba(6,182,212,.3)}.brand b,.brand small{display:block}.brand 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@media(max-width:1050px){.col-3{grid-column:span 6}.col-4{grid-column:span 6}.col-5,.col-7{grid-column:span 12}.col-6,.col-8{grid-column:span 12}.sidebar{transform:translateX(-100%);transition:.25s}.sidebar.open{transform:none}.main{margin-left:0;width:100%}.menu{display:block}.shade{position:fixed;inset:0;background:rgba(15,23,42,.5);z-index:25}.shade.open{display:block}}
@media(max-width:700px){.content{padding:15px}.topbar{height:72px;padding:0 15px}.topbar h1{font-size:16px}.topbar p,.user-chip{display:none}.wallet-chip{padding:7px 10px}.col-3,.col-4,.col-6{grid-column:span 12}.form-grid{grid-template-columns:1fr}.auth-wrap{grid-template-columns:1fr}.auth-cover{display:none}.auth-form{padding:28px 22px}.public-page{padding:14px}.card-head,.card-body{padding:15px}.hero-card{padding:20px}.hero-card h2{font-size:21px}}
.sidebar nav{overflow-y:auto;min-height:0;padding-right:3px}.sidebar nav::-webkit-scrollbar{width:4px}.sidebar nav::-webkit-scrollbar-thumb{background:rgba(255,255,255,.18);border-radius:10px}.note-box{border:1px dashed #93c5fd;background:#eff6ff;color:#1e3a8a;border-radius:14px;padding:13px;font-size:12px;line-height:1.55}.metric-row{display:flex;gap:8px;flex-wrap:wrap}.metric{background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:9px 11px;font-size:11px}.metric b{display:block;font-size:15px;margin-top:3px}.question-text{white-space:pre-wrap;line-height:1.55}.option-list{display:grid;gap:6px;margin-top:8px}.option-list span{background:#f8fafc;border:1px solid #edf2f7;padding:7px 9px;border-radius:9px;font-size:11px}.option-list span.correct{background:#ecfdf5;border-color:#86efac;color:#166534;font-weight:800}.paper-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.paper-item{border:1px solid var(--line);border-radius:14px;padding:13px;background:#fff}.paper-item label{display:flex;gap:10px;align-items:flex-start}.paper-item input{margin-top:3px}.print-sheet{background:#fff;max-width:900px;margin:auto;padding:34px;border:1px solid #cbd5e1}.print-title{text-align:center;border-bottom:2px solid #172554;padding-bottom:16px;margin-bottom:18px}.print-title h1{margin:0 0 6px}.certificate-card{background:linear-gradient(135deg,#fff,#eff6ff);border:8px double #172554;padding:38px;text-align:center;min-height:580px;display:flex;flex-direction:column;justify-content:center}.certificate-card h1{font-size:42px;color:#172554;margin:0 0 20px}.certificate-card .student-name{font-size:30px;font-weight:900;color:#b45309;margin:12px 0}.certificate-card .course-name{font-size:23px;font-weight:800;color:#1d4ed8;margin:12px 0}.exam-countdown{font-weight:900;color:#b91c1c;background:#fee2e2;border-radius:10px;padding:8px 12px}.mcq-item{border:1px solid var(--line);border-radius:16px;padding:16px;margin-bottom:14px}.mcq-options{display:grid;gap:10px;margin-top:12px}.mcq-options label{display:flex;gap:10px;padding:11px;border:1px solid #dbe3ef;border-radius:12px;cursor:pointer}.mcq-options label:hover{background:#eff6ff}@media print{.sidebar,.topbar,.footer,.no-print{display:none!important}.main{margin:0;width:100%}.content{padding:0;max-width:none}.card{box-shadow:none;border:0}.print-sheet{border:0;padding:10px}.certificate-card{min-height:98vh}}
@media(max-width:700px){.paper-grid{grid-template-columns:1fr}.certificate-card{padding:22px;min-height:500px}.certificate-card h1{font-size:30px}.certificate-card .student-name{font-size:23px}}