:root{
  --c-bg:        #f4f6fb;
  --c-card:      #ffffff;
  --c-primary:   #1f3a8a;
  --c-primary-2: #2b50c8;
  --c-accent:    #b91c1c;
  --c-text:      #1f2937;
  --c-muted:     #6b7280;
  --c-border:    #e5e7eb;
  --sidebar-w:   260px;
}

*{box-sizing:border-box}
body.admin-body{
  margin:0;
  background:var(--c-bg);
  font-family:'Inter','Segoe UI',system-ui,-apple-system,sans-serif;
  color:var(--c-text);
  font-size:14px;
}

.admin-wrapper{display:flex;min-height:100vh}

/* ---------------------------------------------------------------
   Sidebar
--------------------------------------------------------------- */
.admin-sidebar{
  width:var(--sidebar-w);
  background:linear-gradient(180deg,#0f172a 0%, #1e293b 100%);
  color:#cbd5e1;
  display:flex;
  flex-direction:column;
  position:fixed;
  top:0;left:0;bottom:0;
  z-index:100;
  transition:transform .25s ease;
}
.sidebar-brand{
  display:flex;align-items:center;gap:.75rem;
  padding:1.25rem 1.25rem;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.brand-logo{
  width:42px;height:42px;border-radius:10px;
  background:linear-gradient(135deg,#3b82f6,#8b5cf6);
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:14px;letter-spacing:.5px;
  box-shadow:0 4px 14px rgba(59,130,246,.4);
}
.brand-name{display:block;color:#fff;font-weight:600;font-size:14px}
.brand-sub{display:block;color:#94a3b8;font-size:11px}

.sidebar-nav{flex:1;padding:.75rem .5rem;overflow-y:auto}
.sidebar-link{
  display:flex;align-items:center;gap:.75rem;
  padding:.7rem 1rem;border-radius:8px;
  color:#cbd5e1;text-decoration:none;
  margin-bottom:.15rem;font-weight:500;font-size:13.5px;
  transition:all .15s ease;
}
.sidebar-link i{font-size:16px;width:18px;text-align:center}
.sidebar-link:hover{background:rgba(255,255,255,.06);color:#fff}
.sidebar-link.active{background:var(--c-primary-2);color:#fff;box-shadow:0 4px 12px rgba(43,80,200,.35)}

.sidebar-footer{padding:1rem;border-top:1px solid rgba(255,255,255,.08)}
.admin-card{display:flex;align-items:center;gap:.6rem;margin-bottom:.6rem}
.admin-avatar{
  width:36px;height:36px;border-radius:50%;
  background:linear-gradient(135deg,#f59e0b,#ef4444);
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:14px;
}
.admin-name{display:block;color:#fff;font-size:13px;font-weight:600}
.admin-email{display:block;color:#94a3b8;font-size:11px}
.btn-logout{
  width:100%;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);
  color:#fca5a5;padding:.5rem;border-radius:6px;font-size:12.5px;cursor:pointer;
  transition:all .15s ease;
}
.btn-logout:hover{background:rgba(239,68,68,.15);color:#fff;border-color:rgba(239,68,68,.3)}

/* ---------------------------------------------------------------
   Main
--------------------------------------------------------------- */
.admin-main{
  margin-left:var(--sidebar-w);flex:1;display:flex;flex-direction:column;min-width:0;
}

.admin-topbar{
  background:var(--c-card);height:64px;
  display:flex;align-items:center;gap:1rem;padding:0 1.5rem;
  border-bottom:1px solid var(--c-border);
  position:sticky;top:0;z-index:50;
}
.topbar-toggle{
  background:none;border:none;font-size:22px;cursor:pointer;color:var(--c-text);
  display:none;
}
.topbar-search{
  flex:1;max-width:520px;display:flex;align-items:center;gap:.5rem;
  background:var(--c-bg);border:1px solid var(--c-border);
  border-radius:8px;padding:.45rem .8rem;
}
.topbar-search i{color:var(--c-muted)}
.topbar-search input{
  border:none;background:transparent;outline:none;flex:1;font-size:13px;color:var(--c-text);
}
.topbar-right{display:flex;align-items:center;gap:1rem;margin-left:auto}
.topbar-lab{font-size:12px;color:var(--c-muted);font-weight:500}
.topbar-avatar{
  width:36px;height:36px;border-radius:50%;
  background:linear-gradient(135deg,#3b82f6,#8b5cf6);color:#fff;
  display:flex;align-items:center;justify-content:center;text-decoration:none;font-weight:700;
}

.admin-content{flex:1;padding:1.75rem;max-width:1400px;width:100%;margin:0 auto}
.admin-footer{text-align:center;padding:1.25rem;color:var(--c-muted);font-size:12px}

/* ---------------------------------------------------------------
   Cards
--------------------------------------------------------------- */
.card{background:var(--c-card);border:1px solid var(--c-border);border-radius:10px}
.card-header{background:#fff;border-bottom:1px solid var(--c-border);padding:1rem 1.25rem;font-weight:600}
.card-body{padding:1.25rem}

.stat-card{
  background:var(--c-card);border:1px solid var(--c-border);border-radius:10px;
  padding:1.25rem;display:flex;align-items:center;gap:1rem;
  transition:transform .15s ease, box-shadow .15s ease;
}
.stat-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(15,23,42,.08)}
.stat-icon{
  width:48px;height:48px;border-radius:10px;
  display:flex;align-items:center;justify-content:center;font-size:20px;color:#fff;
}
.stat-icon.blue{background:linear-gradient(135deg,#3b82f6,#1d4ed8)}
.stat-icon.green{background:linear-gradient(135deg,#10b981,#047857)}
.stat-icon.amber{background:linear-gradient(135deg,#f59e0b,#d97706)}
.stat-icon.red{background:linear-gradient(135deg,#ef4444,#b91c1c)}
.stat-icon.purple{background:linear-gradient(135deg,#8b5cf6,#6d28d9)}
.stat-icon.teal{background:linear-gradient(135deg,#14b8a6,#0f766e)}
.stat-value{font-size:24px;font-weight:700;line-height:1;color:var(--c-text)}
.stat-label{font-size:12px;color:var(--c-muted);margin-top:.25rem}

/* Tables */
.table{margin:0;font-size:13.5px}
.table thead th{
  background:#f9fafb;border-bottom:1px solid var(--c-border);
  font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--c-muted);
  font-weight:600;padding:.75rem 1rem;
}
.table tbody td{padding:.85rem 1rem;border-bottom:1px solid #f1f5f9;vertical-align:middle}
.table tbody tr:hover{background:#f9fafb}

/* Buttons */
.btn-primary{background:var(--c-primary);border-color:var(--c-primary)}
.btn-primary:hover{background:var(--c-primary-2);border-color:var(--c-primary-2)}
.btn-outline-primary{color:var(--c-primary);border-color:var(--c-primary)}
.btn-outline-primary:hover{background:var(--c-primary);border-color:var(--c-primary)}
.btn-sm{font-size:12px}

/* Badges */
.badge-issued{background:#dcfce7;color:#166534}
.badge-draft{background:#fef3c7;color:#92400e}
.badge-revoked{background:#fee2e2;color:#991b1b}
.badge{font-weight:500;font-size:11px;padding:.35rem .55rem;border-radius:6px}

/* Login page */
.login-body{
  min-height:100vh;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#0f172a 0%, #1e3a8a 100%);
  padding:1rem;
}
.login-card{
  background:#fff;border-radius:14px;padding:2.5rem;width:100%;max-width:420px;
  box-shadow:0 20px 60px rgba(0,0,0,.25);
}
.login-brand{
  width:64px;height:64px;border-radius:14px;margin:0 auto 1rem;
  background:linear-gradient(135deg,#3b82f6,#8b5cf6);
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:20px;
  box-shadow:0 8px 24px rgba(59,130,246,.4);
}
.login-title{text-align:center;font-size:20px;font-weight:700;margin-bottom:.25rem}
.login-sub{text-align:center;color:var(--c-muted);font-size:13px;margin-bottom:1.75rem}

/* Certificate detail view */
.cert-detail-header{
  background:linear-gradient(135deg,#1e3a8a,#3b82f6);color:#fff;
  border-radius:12px;padding:1.5rem;margin-bottom:1.5rem;
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem;
}
.cert-detail-header h3{margin:0;font-weight:700}
.cert-detail-header .cert-num{font-family:'Courier New',monospace;letter-spacing:1px}
.cert-detail-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}
.cert-detail-grid .field{background:#f9fafb;border:1px solid var(--c-border);border-radius:8px;padding:.85rem}
.cert-detail-grid .field-label{font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--c-muted);font-weight:600;margin-bottom:.25rem}
.cert-detail-grid .field-value{font-size:14px;font-weight:500;color:var(--c-text)}

/* Responsive */
@media (max-width:992px){
  .admin-sidebar{transform:translateX(-100%)}
  .admin-sidebar.show{transform:translateX(0)}
  .admin-main{margin-left:0}
  .topbar-toggle{display:block}
}