:root{
  --navy:#1A2744;--navy2:#243356;--blue:#3B6DE0;--blue-h:#2D5BC7;
  --teal:#0EA576;--teal-l:#E8F8F2;--amber:#E89B1C;--amber-l:#FFF6E5;
  --red:#D94452;--red-l:#FFF0F1;--purple:#7C3AED;--purple-l:#F3EEFB;
  --green:#16A34A;--green-l:#E8F8ED;
  --bg:#F4F6FB;--card:#FFF;--bdr:#E2E6EF;--txt:#1A2744;--muted:#6B7A99;--light:#94A3BF;
  --sidebar:240px;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--txt);display:flex;min-height:100vh}

/* SIDEBAR */
.sb{width:var(--sidebar);background:var(--navy);color:#fff;position:fixed;top:0;left:0;bottom:0;display:flex;flex-direction:column;z-index:100}
.sb-brand{padding:18px 22px;border-bottom:1px solid rgba(255,255,255,.08)}
.sb-brand h1{font-family:'DM Serif Display',serif;font-size:20px;font-weight:400}
.sb-brand span{color:var(--teal)}
.sb-nav{flex:1;padding:12px 10px;overflow-y:auto}
.sb-lbl{font-size:9px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:rgba(255,255,255,.25);padding:14px 12px 6px}
.ni{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:7px;color:rgba(255,255,255,.55);font-size:13px;font-weight:500;cursor:pointer;border:none;background:none;width:100%;text-align:left;transition:.12s}
.ni:hover{background:rgba(255,255,255,.06);color:#fff}
.ni.ac{background:var(--blue);color:#fff}
.ni svg{width:17px;height:17px;flex-shrink:0}
.ni .badge{margin-left:auto;background:rgba(255,255,255,.15);padding:1px 7px;border-radius:10px;font-size:10px;font-weight:700}
.sb-ft{padding:14px;border-top:1px solid rgba(255,255,255,.08);display:flex;align-items:center;gap:10px}
.sb-av{width:32px;height:32px;border-radius:50%;background:var(--blue);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:12px}
.sb-ft p{font-size:12px;font-weight:600}.sb-ft span{font-size:10px;color:rgba(255,255,255,.35)}

/* MAIN */
.mn{margin-left:var(--sidebar);flex:1;min-height:100vh}
.tb{height:58px;background:var(--card);border-bottom:1px solid var(--bdr);display:flex;align-items:center;justify-content:space-between;padding:0 28px;position:sticky;top:0;z-index:50}
.tb-t{font-family:'DM Serif Display',serif;font-size:18px}
.tb-a{display:flex;gap:8px;align-items:center}
.ct{padding:22px 28px}

/* BUTTONS */
.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 15px;border-radius:7px;font-size:12px;font-weight:600;border:none;cursor:pointer;transition:.12s;font-family:inherit}
.btn svg{width:14px;height:14px}
.btn-p{background:var(--blue);color:#fff}.btn-p:hover{background:var(--blue-h)}
.btn-o{background:var(--card);color:var(--txt);border:1px solid var(--bdr)}.btn-o:hover{border-color:var(--blue);color:var(--blue)}
.btn-s{background:var(--teal);color:#fff}.btn-s:hover{opacity:.9}
.btn-d{background:var(--red);color:#fff}
.btn-sm{padding:5px 10px;font-size:11px}
.btn-lg{padding:11px 22px;font-size:14px}

/* CARDS & PANELS */
.panel{background:var(--card);border:1px solid var(--bdr);border-radius:11px}
.panel-h{padding:14px 18px;border-bottom:1px solid var(--bdr);display:flex;align-items:center;justify-content:space-between}
.panel-h h3{font-size:14px;font-weight:600}
.panel-b{padding:14px 18px}

/* STATS */
.sg{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-bottom:20px}
.sc{background:var(--card);border:1px solid var(--bdr);border-radius:10px;padding:16px 18px}
.sc-i{width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;margin-bottom:10px}
.sc-i svg{width:18px;height:18px}
.sc-n{font-family:'JetBrains Mono',monospace;font-size:24px;font-weight:600}
.sc-l{font-size:11px;color:var(--muted);margin-top:2px}

/* TAGS */
.tag{display:inline-flex;align-items:center;gap:3px;padding:2px 9px;border-radius:16px;font-size:10px;font-weight:600}
.tag-phy{background:#EBF1FD;color:var(--blue)}.tag-che{background:var(--teal-l);color:var(--teal)}
.tag-bot{background:var(--green-l);color:var(--green)}.tag-zoo{background:var(--amber-l);color:var(--amber)}
.tag-mat{background:var(--purple-l);color:var(--purple)}
.tag-n{background:var(--bg);color:var(--muted);font-weight:500}
.diff{font-size:9px;font-weight:700;text-transform:uppercase;letter-spacing:.4px;padding:2px 7px;border-radius:3px}
.diff-e{background:var(--teal-l);color:var(--teal)}.diff-m{background:var(--amber-l);color:var(--amber)}.diff-h{background:var(--red-l);color:var(--red)}

/* FORMS */
.fg{display:flex;flex-direction:column;gap:4px}
.fg label{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.4px;color:var(--muted)}
.fg select,.fg input,.fg textarea{padding:8px 11px;border:1px solid var(--bdr);border-radius:7px;font-size:13px;font-family:inherit;background:var(--card);color:var(--txt);transition:.12s}
.fg select:focus,.fg input:focus,.fg textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(59,109,224,.1)}
.fg textarea{resize:vertical;min-height:80px}

/* FILTER BAR */
.fb{background:var(--card);border:1px solid var(--bdr);border-radius:11px;padding:14px 16px;display:flex;gap:10px;margin-bottom:16px;flex-wrap:wrap;align-items:flex-end}
.fb .fg select,.fb .fg input{min-width:130px;font-size:12px;padding:7px 10px}
.fb .search{flex:1;min-width:160px;position:relative}
.fb .search svg{position:absolute;left:9px;bottom:8px;width:14px;height:14px;color:var(--light)}
.fb .search input{padding-left:28px;width:100%}
.fb .fa{display:flex;gap:6px;margin-left:auto}

/* QUESTION CARDS */
.ql{display:flex;flex-direction:column;gap:10px}
.qc{background:var(--card);border:1px solid var(--bdr);border-radius:10px;overflow:hidden;display:flex;transition:.12s}
.qc:hover{border-color:#C8D3E8;box-shadow:0 2px 10px rgba(26,39,68,.05)}
.qc.sel{border-color:var(--blue);box-shadow:0 0 0 2px rgba(59,109,224,.1)}
.qs{width:4px;flex-shrink:0}
.qs-phy{background:var(--blue)}.qs-che{background:var(--teal)}.qs-bot{background:var(--green)}.qs-zoo{background:var(--amber)}.qs-mat{background:var(--purple)}
.qck{display:flex;align-items:flex-start;padding:16px 0 16px 14px}
.qck input{width:16px;height:16px;accent-color:var(--blue);cursor:pointer;margin-top:2px}
.qb{flex:1;padding:14px 18px 14px 12px}
.qt{display:flex;align-items:center;gap:8px;margin-bottom:8px;flex-wrap:wrap}
.qn{font-family:'JetBrains Mono',monospace;font-size:11px;font-weight:500;color:var(--muted);background:var(--bg);padding:2px 8px;border-radius:3px}
.qtx{font-size:13px;line-height:1.6;margin-bottom:12px}
.og{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.oi{display:flex;align-items:center;gap:8px;padding:7px 12px;border:1px solid var(--bdr);border-radius:7px;font-size:12px;cursor:pointer;transition:.12s}
.oi:hover{border-color:var(--blue);background:#FAFBFF}
.oi.sel{border-color:var(--blue);background:#EBF1FD}
.oi.cor{border-color:var(--teal);background:var(--teal-l)}
.oi.wrg{border-color:var(--red);background:var(--red-l)}
.ol{width:22px;height:22px;border-radius:50%;background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:700;flex-shrink:0}
.oi.sel .ol{background:var(--blue);color:#fff}
.oi.cor .ol{background:var(--teal);color:#fff}
.oi.wrg .ol{background:var(--red);color:#fff}
.qf{display:flex;align-items:center;gap:10px;margin-top:12px;padding-top:10px;border-top:1px solid var(--bdr);flex-wrap:wrap}
.ans-b{font-size:11px;font-weight:600;padding:2px 10px;border-radius:5px;background:var(--teal-l);color:var(--teal)}
.src-t{font-size:10px;color:var(--light);margin-left:auto}

/* ANSWER INPUT ROW */
.air{display:flex;align-items:center;gap:8px;margin-top:10px}
.air label{font-size:11px;font-weight:600;color:var(--muted);white-space:nowrap}
.air select{padding:5px 8px;border:1px solid var(--bdr);border-radius:5px;font-size:12px;font-family:inherit}

/* UPLOAD */
.uz{border:2px dashed var(--bdr);border-radius:14px;padding:50px 30px;text-align:center;background:var(--card);cursor:pointer;transition:.2s;margin-bottom:20px}
.uz:hover{border-color:var(--blue);background:#FAFBFF}
.uz-i{width:56px;height:56px;border-radius:14px;background:#EBF1FD;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.uz-i svg{width:24px;height:24px;color:var(--blue)}
.uz h3{font-size:15px;margin-bottom:4px}
.uz p{font-size:12px;color:var(--muted)}
.up{background:var(--card);border:1px solid var(--bdr);border-radius:10px;padding:16px 18px;margin-bottom:14px;display:flex;align-items:center;gap:14px}
.up-i{width:40px;height:40px;border-radius:8px;background:var(--red-l);display:flex;align-items:center;justify-content:center;color:var(--red);font-size:10px;font-weight:800;flex-shrink:0}
.up-inf{flex:1}.up-inf p{font-size:12px;font-weight:600;margin-bottom:6px}
.pb{height:5px;background:var(--bg);border-radius:3px;overflow:hidden}
.pf{height:100%;border-radius:3px;background:var(--blue);transition:width .5s}
.up-m{font-size:10px;color:var(--muted);margin-top:3px}

/* GRID LAYOUTS */
.g2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.g3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}
.g4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}

/* CBT EXAM INTERFACE */
.cbt-wrap{display:grid;grid-template-columns:1fr 280px;gap:16px}
.cbt-q{background:var(--card);border:1px solid var(--bdr);border-radius:12px;padding:24px}
.cbt-nav{background:var(--card);border:1px solid var(--bdr);border-radius:12px;padding:16px}
.cbt-timer{font-family:'JetBrains Mono',monospace;font-size:20px;font-weight:600;color:var(--amber);text-align:center;padding:12px;background:var(--amber-l);border-radius:8px;margin-bottom:14px}
.cbt-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:5px;margin-bottom:14px}
.cbt-cell{width:100%;aspect-ratio:1;border-radius:6px;border:1px solid var(--bdr);display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;cursor:pointer;transition:.12s;background:var(--card)}
.cbt-cell:hover{border-color:var(--blue)}
.cbt-cell.cur{background:var(--blue);color:#fff;border-color:var(--blue)}
.cbt-cell.ans{background:var(--teal-l);color:var(--teal);border-color:var(--teal)}
.cbt-cell.rev{background:var(--amber-l);color:var(--amber);border-color:var(--amber)}
.cbt-cell.skip{background:var(--red-l);color:var(--red);border-color:var(--red)}
.cbt-legend{display:flex;flex-direction:column;gap:6px;font-size:11px;color:var(--muted)}
.cbt-legend div{display:flex;align-items:center;gap:6px}
.cbt-legend .dot{width:10px;height:10px;border-radius:3px;flex-shrink:0}

/* RESULTS */
.rh{background:var(--card);border:1px solid var(--bdr);border-radius:14px;padding:30px;text-align:center;margin-bottom:20px}
.rs{font-family:'DM Serif Display',serif;font-size:60px;line-height:1}
.rs .rt{font-size:28px;color:var(--muted)}
.rb{display:flex;justify-content:center;gap:36px;margin-top:20px;padding-top:20px;border-top:1px solid var(--bdr)}
.rb-s{text-align:center}.rb-n{font-family:'JetBrains Mono',monospace;font-size:22px;font-weight:500}
.rb-l{font-size:11px;color:var(--muted);margin-top:2px}
.sb-r{background:var(--card);border:1px solid var(--bdr);border-radius:10px;padding:16px}
.sb-r h4{font-size:13px;margin-bottom:10px;display:flex;align-items:center;gap:6px}
.scb{height:7px;background:var(--bg);border-radius:4px;overflow:hidden;margin-bottom:6px}
.scb-f{height:100%;border-radius:4px;transition:width .8s}

/* PAGINATION */
.pg{display:flex;align-items:center;justify-content:center;gap:5px;margin-top:20px}
.pgb{min-width:34px;height:34px;border-radius:7px;border:1px solid var(--bdr);background:var(--card);font-size:12px;font-weight:500;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.12s;font-family:inherit}
.pgb:hover{border-color:var(--blue)}.pgb.ac{background:var(--blue);color:#fff;border-color:var(--blue)}

/* TABLE */
.dt{width:100%;border-collapse:collapse}
.dt th{text-align:left;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.4px;color:var(--muted);padding:10px 14px;border-bottom:1px solid var(--bdr);background:var(--bg)}
.dt td{padding:12px 14px;font-size:12px;border-bottom:1px solid var(--bdr)}
.dt tr:hover td{background:var(--bg)}
.st{display:inline-flex;align-items:center;gap:3px;padding:2px 8px;border-radius:14px;font-size:10px;font-weight:600}
.st-ok{background:var(--teal-l);color:var(--teal)}.st-pr{background:var(--amber-l);color:var(--amber)}.st-fl{background:var(--red-l);color:var(--red)}
.st-dot{width:5px;height:5px;border-radius:50%;background:currentColor}

/* PRINT PREVIEW */
.pp{background:var(--card);border:1px solid var(--bdr);border-radius:12px;overflow:hidden}
.pp-header{text-align:center;padding:24px 20px;border-bottom:2px solid var(--txt)}
.pp-header h1{font-family:'DM Serif Display',serif;font-size:22px;margin-bottom:2px}
.pp-header p{font-size:12px;color:var(--muted)}
.pp-body{padding:20px}
.pp-q{padding:12px 0;border-bottom:1px solid var(--bdr);display:flex;gap:10px}
.pp-q:last-child{border-bottom:none}
.pp-qn{font-family:'JetBrains Mono',monospace;font-size:11px;font-weight:600;color:var(--muted);min-width:32px;flex-shrink:0}
.pp-qc{flex:1}
.pp-qt{font-size:12px;line-height:1.5;margin-bottom:6px}
.pp-opts{display:grid;grid-template-columns:1fr 1fr;gap:4px;font-size:11px;color:var(--muted)}
.pp-opts span{padding:3px 0}
.pp-ak{margin-top:20px;padding-top:20px;border-top:3px double var(--txt)}
.pp-ak h3{font-family:'DM Serif Display',serif;font-size:16px;margin-bottom:12px;text-align:center}
.pp-ak-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:4px}
.pp-ak-cell{text-align:center;padding:6px;border:1px solid var(--bdr);border-radius:4px;font-size:10px}
.pp-ak-cell .pp-n{font-weight:700;color:var(--muted)}.pp-ak-cell .pp-a{font-weight:800;color:var(--teal)}

/* MODAL */
.mo{position:fixed;inset:0;background:rgba(26,39,68,.45);z-index:500;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:.2s}
.mo.show{opacity:1;pointer-events:all}
.md{background:var(--card);border-radius:14px;width:560px;max-height:85vh;overflow-y:auto;box-shadow:0 20px 60px rgba(26,39,68,.2);transform:translateY(10px);transition:.2s}
.mo.show .md{transform:translateY(0)}
.md-h{padding:18px 22px 0;display:flex;align-items:center;justify-content:space-between}
.md-h h2{font-family:'DM Serif Display',serif;font-size:18px}
.md-x{width:30px;height:30px;border-radius:7px;border:1px solid var(--bdr);background:var(--card);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:16px;color:var(--muted)}
.md-b{padding:16px 22px}
.md-f{padding:0 22px 18px;display:flex;gap:8px;justify-content:flex-end}

.po{display:flex;align-items:center;gap:10px;padding:9px 12px;border:1px solid var(--bdr);border-radius:7px;margin-bottom:7px;cursor:pointer;transition:.12s}
.po:hover{border-color:var(--blue);background:#FAFBFF}
.po input{accent-color:var(--blue);width:15px;height:15px}
.po-l{font-size:12px;font-weight:500}.po-d{font-size:10px;color:var(--muted)}
.ms{margin-bottom:16px}.ms h4{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.4px;color:var(--muted);margin-bottom:8px}

/* TOAST */
.toast{position:fixed;bottom:20px;right:20px;background:var(--navy);color:#fff;padding:12px 18px;border-radius:9px;font-size:12px;font-weight:500;z-index:600;animation:tIn .3s;box-shadow:0 8px 30px rgba(26,39,68,.25);display:flex;align-items:center;gap:8px}
@keyframes tIn{from{transform:translateY(16px);opacity:0}to{transform:translateY(0);opacity:1}}

.hidden{display:none!important}

/* PRINT */
@media print{
  body{background:#fff;display:block}
  .sb,.tb,.fb,.sg,.pg,.mo,.toast,.tb-a,.qck,.src-t,.qf .btn,.cbt-nav,.fa,.btn{display:none!important}
  .mn{margin-left:0}.ct{padding:0}
  .pp{border:none;border-radius:0;box-shadow:none}
  .pp-header{padding:20px 0;border-bottom:3px double #000}
  .pp-q{page-break-inside:avoid}
  .pp-ak{page-break-before:always}
  .print-only{display:block!important}
}
.print-only{display:none}

@media(max-width:1024px){.sg{grid-template-columns:repeat(3,1fr)}.cbt-wrap{grid-template-columns:1fr}.og{grid-template-columns:1fr}.g3{grid-template-columns:1fr 1fr}}
@media(max-width:768px){.sb{display:none}.mn{margin-left:0}.ct{padding:14px}.sg{grid-template-columns:1fr 1fr}.g2,.g3,.g4{grid-template-columns:1fr}.fb{flex-direction:column}.md{width:95%}}

/* QuestionVault additions (not in original mockup, same design language) */
.alert{border-radius:8px;padding:10px 16px;margin-bottom:16px;font-size:12px;display:flex;align-items:center;gap:8px}
.alert-warn{background:var(--amber-l);border:1px solid var(--amber);color:#92610F}
.alert-error{background:var(--red-l);border:1px solid var(--red);color:#8A2530}
.alert-ok{background:var(--teal-l);border:1px solid var(--teal);color:#0B6B4F}
a{color:inherit;text-decoration:none}
.link-btn{background:none;border:none;padding:0;font:inherit;cursor:pointer}
.subj-row{display:flex;align-items:center;gap:10px;padding:8px 12px;border:1px solid var(--bdr);border-radius:7px}
.subj-row input[type=number]{width:60px;padding:4px 8px;border:1px solid var(--bdr);border-radius:5px;font-size:12px;text-align:center}
.badge-count{font-size:11px;color:var(--muted)}
.w-full{width:100%}
.mt-2{margin-top:8px}.mb-2{margin-bottom:8px}
.flex-between{display:flex;align-items:center;justify-content:space-between}
.text-muted{color:var(--muted)}
.chip-remove{cursor:pointer;color:var(--red);font-weight:700;margin-left:4px}