:root{
  --sidebar-w: 250px;
  --brand: #14532d;
  --brand-light: #e8f3ec;
}
body{ background:#f4f6f8; font-family: -apple-system, Segoe UI, Roboto, Arial, sans-serif; }
.app-shell{ display:flex; min-height:100vh; }
.sidebar{
  width: var(--sidebar-w); background:#0f2417; color:#dce8e0; flex-shrink:0;
  position:fixed; top:0; bottom:0; left:0; overflow-y:auto; z-index:1030;
  transition: transform .2s ease;
}
.sidebar-brand{ display:flex; align-items:center; gap:.5rem; padding:1.1rem 1.2rem; font-weight:700; font-size:1.05rem; color:#fff; border-bottom:1px solid rgba(255,255,255,.08); }
.sidebar-nav{ padding:.5rem 0 2rem; }
.sidebar-nav a{ display:flex; align-items:center; gap:.6rem; color:#c7d7cd; text-decoration:none; padding:.55rem 1.2rem; font-size:.92rem; }
.sidebar-nav a:hover{ background:rgba(255,255,255,.06); color:#fff; }
.sidebar-nav a.active{ background:var(--brand); color:#fff; font-weight:600; }
.nav-heading{ text-transform:uppercase; font-size:.7rem; letter-spacing:.06em; color:#7c9184; padding:1rem 1.2rem .3rem; }
.main-area{ margin-left: var(--sidebar-w); flex:1; display:flex; flex-direction:column; min-width:0; }
.topbar{ background:#fff; border-bottom:1px solid #e5e7eb; padding:.8rem 1.5rem; display:flex; align-items:center; gap:1rem; position:sticky; top:0; z-index:10; }
.page-title{ font-size:1.15rem; font-weight:700; margin:0; flex:1; }
.content{ padding:1.5rem; }
.card{ border:1px solid #e6e9ec; border-radius:.6rem; }
.stat-card{ border-radius:.7rem; padding:1.1rem 1.3rem; color:#fff; }
.stat-card h3{ font-size:1.9rem; font-weight:800; margin:0; }
.stat-card span{ font-size:.85rem; opacity:.9; }
.bg-brand1{ background:linear-gradient(135deg,#14532d,#1e7a44); }
.bg-brand2{ background:linear-gradient(135deg,#1e3a8a,#2f5bd6); }
.bg-brand3{ background:linear-gradient(135deg,#7c2d12,#c2410c); }
.bg-brand4{ background:linear-gradient(135deg,#4c1d95,#7c3aed); }
.paper-preview{ background:#fff; max-width:800px; margin:0 auto; padding:2.2cm 1.8cm; border:1px solid #ddd; box-shadow:0 0 10px rgba(0,0,0,.06); font-family: "Times New Roman", Georgia, serif; }
.paper-preview h2, .paper-preview h3{ text-align:center; margin:.15rem 0; }
.paper-preview .section-title{ font-weight:700; text-decoration:underline; margin-top:1.4rem; margin-bottom:.6rem; }
.paper-preview .q-block{ margin-bottom:.9rem; }
.paper-preview .opts{ display:grid; grid-template-columns:1fr 1fr; gap:.15rem .8rem; margin-left:1.2rem; }
.marks-summary{ position:sticky; top:70px; }
@media print{
  .no-print{ display:none !important; }
  .paper-preview{ border:none; box-shadow:none; margin:0; max-width:100%; }
  body{ background:#fff; }
}
@media (max-width: 991px){
  .sidebar{ transform: translateX(-100%); }
  .sidebar.show{ transform: translateX(0); }
  .main-area{ margin-left:0; }
}