/* ============================================================
   IliadProx LMS – Design System "Tech Moderne"
   Inter Font | Blue #0055FF | Glassmorphism Sidebar
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ---------- Variables ---------- */
:root {
  --primary:       #0055FF;
  --primary-dark:  #0040CC;
  --primary-light: #e8f0ff;
  --primary-glow:  rgba(0, 85, 255, 0.15);
  --accent:        #00CFFF;
  --success:       #16a34a;
  --success-bg:    #dcfce7;
  --warning:       #d97706;
  --warning-bg:    #fef3c7;
  --danger:        #dc2626;
  --danger-bg:     #fee2e2;
  --info:          #0891b2;
  --info-bg:       #e0f2fe;

  --bg:            #f0f4ff;
  --bg-card:       #ffffff;
  --bg-hover:      #f8faff;

  --sidebar-bg:    rgba(8, 12, 36, 0.92);
  --sidebar-glass: blur(20px);
  --sidebar-w:     260px;
  --sidebar-w-col: 72px;

  --text-primary:   #0f1117;
  --text-secondary: #64748b;
  --text-muted:     #94a3b8;
  --border:         #e2e8f0;
  --border-focus:   #0055FF;

  --radius-sm:  6px;
  --radius:     10px;
  --radius-lg:  16px;
  --radius-xl:  24px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow:    0 4px 16px rgba(0,85,255,0.08), 0 1px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 40px rgba(0,85,255,0.12), 0 4px 12px rgba(0,0,0,0.08);
  --shadow-glow: 0 0 0 3px var(--primary-glow);

  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: var(--font); }

/* ---------- Layout ---------- */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ---------- Sidebar Glassmorphism ---------- */
.sidebar {
  width: var(--sidebar-w);
  min-height: 100vh;
  background: var(--sidebar-bg);
  backdrop-filter: var(--sidebar-glass);
  -webkit-backdrop-filter: var(--sidebar-glass);
  border-right: 1px solid rgba(255,255,255,0.06);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 100;
  transition: width 0.25s ease;
  overflow: hidden;
}

.sidebar::before {
  content: '';
  position: absolute;
  top: -60px;
  left: -60px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(0,85,255,0.3) 0%, transparent 70%);
  pointer-events: none;
}

.sidebar-logo {
  padding: 24px 20px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.sidebar-logo-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 0 16px rgba(0,85,255,0.5);
}

.sidebar-logo-icon svg { color: #fff; }

.sidebar-logo-text {
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.3px;
  line-height: 1.2;
  white-space: nowrap;
}

.sidebar-logo-sub {
  font-size: 10px;
  font-weight: 400;
  color: rgba(255,255,255,0.4);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.sidebar-section {
  padding: 16px 12px 4px;
}

.sidebar-section-label {
  font-size: 10px;
  font-weight: 600;
  color: rgba(255,255,255,0.3);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  padding: 0 8px;
  margin-bottom: 4px;
  white-space: nowrap;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 8px 12px;
}

.sidebar-nav::-webkit-scrollbar { width: 3px; }
.sidebar-nav::-webkit-scrollbar-track { background: transparent; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,0.6);
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
  position: relative;
  margin-bottom: 2px;
}

.nav-item:hover {
  color: #fff;
  background: rgba(255,255,255,0.07);
}

.nav-item.active {
  color: #fff;
  background: rgba(0,85,255,0.25);
  border: 1px solid rgba(0,85,255,0.35);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--primary);
  border-radius: 0 2px 2px 0;
}

.nav-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.nav-badge {
  margin-left: auto;
  background: var(--primary);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 20px;
}

.sidebar-footer {
  padding: 16px 12px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.sidebar-user:hover {
  background: rgba(255,255,255,0.07);
}

.sidebar-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}

.sidebar-user-info {
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-user-name {
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-role {
  color: rgba(255,255,255,0.35);
  font-size: 11px;
}

.sidebar-logout {
  color: rgba(255,255,255,0.35);
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 500;
  margin-top: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.sidebar-logout:hover {
  color: #ff4d4d;
  background: rgba(220,38,38,0.1);
}

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

.topbar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.topbar-breadcrumb {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
  font-weight: 400;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.content {
  padding: 32px;
  flex: 1;
}

/* ---------- Cards ---------- */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.card-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}

.card-body { padding: 24px; }
.card-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-hover);
}

/* ---------- Stat cards ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  padding: 22px 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.stat-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-icon.blue   { background: var(--primary-light); color: var(--primary); }
.stat-icon.green  { background: var(--success-bg);    color: var(--success); }
.stat-icon.orange { background: var(--warning-bg);    color: var(--warning); }
.stat-icon.red    { background: var(--danger-bg);     color: var(--danger);  }
.stat-icon.purple { background: #f3e8ff;              color: #7c3aed;        }
.stat-icon.cyan   { background: #e0f7fa;              color: #00acc1;        }

.stat-info { flex: 1; min-width: 0; }
.stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -1px;
  line-height: 1;
  margin-bottom: 4px;
}
.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}
.stat-delta {
  font-size: 12px;
  font-weight: 600;
  margin-top: 4px;
}
.stat-delta.up   { color: var(--success); }
.stat-delta.down { color: var(--danger); }

/* ---------- Tables ---------- */
.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

thead tr {
  background: var(--bg-hover);
}

th {
  padding: 12px 16px;
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: middle;
}

tbody tr {
  transition: background 0.15s;
}

tbody tr:hover {
  background: var(--bg-hover);
}

tbody tr:last-child td {
  border-bottom: none;
}

.td-muted { color: var(--text-muted); font-size: 13px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  font-family: var(--font);
  text-decoration: none;
  line-height: 1;
}

.btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  color: #fff;
  box-shadow: 0 4px 14px rgba(0,85,255,0.3);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border);
}
.btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--text-muted);
  color: var(--text-primary);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}
.btn-danger:hover {
  background: #b91c1c;
  border-color: #b91c1c;
  color: #fff;
}

.btn-success {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}
.btn-success:hover { background: #15803d; color: #fff; }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.btn-icon {
  background: var(--bg-hover);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 8px;
  border-radius: var(--radius-sm);
}
.btn-icon:hover { background: var(--primary-light); color: var(--primary); border-color: var(--primary-light); }

.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-lg { padding: 12px 28px; font-size: 15px; }
.btn-xl { padding: 14px 36px; font-size: 16px; font-weight: 700; }

.btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.btn-sm svg { width: 14px; height: 14px; }

/* ---------- Forms ---------- */
.form-group {
  margin-bottom: 20px;
}

.form-grid {
  display: grid;
  gap: 20px;
}
.form-grid-2 { grid-template-columns: 1fr 1fr; }
.form-grid-3 { grid-template-columns: 1fr 1fr 1fr; }

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

label .required {
  color: var(--danger);
  margin-left: 3px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font);
  color: var(--text-primary);
  background: var(--bg-card);
  transition: var(--transition);
  appearance: none;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}

.form-control::placeholder { color: var(--text-muted); }

textarea.form-control {
  resize: vertical;
  min-height: 100px;
}

select.form-control {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.form-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.form-error {
  font-size: 12px;
  color: var(--danger);
  margin-top: 4px;
}

.form-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  padding-top: 8px;
}

/* Checkbox & Radio */
.checkbox-group, .radio-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.check-item, .radio-item {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.check-item input[type="checkbox"],
.radio-item input[type="radio"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary);
  cursor: pointer;
}

.check-item label, .radio-item label {
  font-size: 14px;
  font-weight: 400;
  color: var(--text-primary);
  cursor: pointer;
  margin: 0;
}

/* ---------- Alerts ---------- */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 20px;
  border: 1px solid transparent;
}

.alert svg { flex-shrink: 0; margin-top: 1px; }

.alert-success { background: var(--success-bg); color: var(--success); border-color: #bbf7d0; }
.alert-error   { background: var(--danger-bg);  color: var(--danger);  border-color: #fecaca; }
.alert-info    { background: var(--info-bg);    color: var(--info);    border-color: #bae6fd; }
.alert-warning { background: var(--warning-bg); color: var(--warning); border-color: #fde68a; }

/* ---------- Badges ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.3px;
  white-space: nowrap;
}

.badge-primary   { background: var(--primary-light); color: var(--primary); }
.badge-success   { background: var(--success-bg);    color: var(--success); }
.badge-warning   { background: var(--warning-bg);    color: var(--warning); }
.badge-danger    { background: var(--danger-bg);     color: var(--danger);  }
.badge-info      { background: var(--info-bg);       color: var(--info);    }
.badge-secondary { background: #f1f5f9;              color: #64748b;        }
.badge-purple    { background: #f3e8ff;              color: #7c3aed;        }

/* ---------- Modals ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.open { display: flex; }

.modal {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(-10px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  padding: 24px 24px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title { font-size: 18px; font-weight: 700; }

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-hover);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}

.modal-close:hover { background: var(--danger-bg); color: var(--danger); }

.modal-body { padding: 24px; }
.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

/* ---------- Progress ---------- */
.progress {
  height: 8px;
  background: var(--bg-hover);
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 4px;
  transition: width 0.4s ease;
}

.progress-bar.success { background: linear-gradient(90deg, var(--success), #4ade80); }
.progress-bar.danger  { background: linear-gradient(90deg, var(--danger), #f87171); }

/* ---------- Login page ---------- */
.login-page {
  min-height: 100vh;
  background: linear-gradient(135deg, #060a1f 0%, #0a1040 50%, #060a1f 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.login-page::before {
  content: '';
  position: absolute;
  top: -150px;
  left: -150px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,85,255,0.2) 0%, transparent 65%);
}

.login-page::after {
  content: '';
  position: absolute;
  bottom: -150px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0,207,255,0.15) 0%, transparent 65%);
}

.login-box {
  background: rgba(255,255,255,0.04);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-xl);
  padding: 48px;
  width: 100%;
  max-width: 440px;
  position: relative;
  z-index: 1;
  box-shadow: 0 25px 60px rgba(0,0,0,0.4);
}

.login-logo {
  text-align: center;
  margin-bottom: 36px;
}

.login-logo-icon {
  width: 60px;
  height: 60px;
  background: var(--primary);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 0 30px rgba(0,85,255,0.5);
}

.login-logo h1 {
  color: #fff;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 4px;
}

.login-logo p {
  color: rgba(255,255,255,0.4);
  font-size: 13px;
}

.login-box .form-control {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.1);
  color: #fff;
}

.login-box .form-control::placeholder { color: rgba(255,255,255,0.3); }

.login-box .form-control:focus {
  background: rgba(255,255,255,0.08);
  border-color: var(--primary);
}

.login-box label { color: rgba(255,255,255,0.7); }

/* ---------- Empty state ---------- */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state svg {
  color: var(--border);
  margin: 0 auto 16px;
  display: block;
}

.empty-state h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.empty-state p { font-size: 14px; margin-bottom: 20px; }

/* ---------- Tabs ---------- */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-hover);
  border-radius: var(--radius-sm);
  padding: 4px;
  width: fit-content;
}

.tab {
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  background: transparent;
  font-family: var(--font);
}

.tab:hover { color: var(--text-primary); }

.tab.active {
  background: var(--bg-card);
  color: var(--primary);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ---------- Search bar ---------- */
.search-bar {
  position: relative;
  display: flex;
  align-items: center;
}

.search-bar input {
  padding-left: 38px;
  width: 260px;
}

.search-bar svg {
  position: absolute;
  left: 12px;
  color: var(--text-muted);
  width: 16px;
  height: 16px;
}

/* ---------- QCM question card ---------- */
.question-card {
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  transition: var(--transition);
}

.question-card:hover { border-color: var(--primary-light); }

.question-number {
  font-size: 11px;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.question-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.5;
}

.option-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.option-item:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.option-item.selected {
  border-color: var(--primary);
  background: var(--primary-light);
}

.option-item.correct {
  border-color: var(--success);
  background: var(--success-bg);
}

.option-item.incorrect {
  border-color: var(--danger);
  background: var(--danger-bg);
}

.option-item input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  flex-shrink: 0;
}

.option-label { font-size: 14px; font-weight: 500; }

/* ---------- Exam timer ---------- */
.exam-timer {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.exam-timer.warning { color: var(--warning); }
.exam-timer.danger  { color: var(--danger);  animation: pulse 1s infinite; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

/* ---------- Score ring ---------- */
.score-ring {
  position: relative;
  display: inline-block;
}

.score-ring svg { transform: rotate(-90deg); }

.score-ring-text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
}

/* ---------- Grading panel ---------- */
.grade-input-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.grade-input {
  width: 80px;
  text-align: center;
  font-size: 18px;
  font-weight: 700;
}

.grade-slider {
  flex: 1;
  accent-color: var(--primary);
  height: 6px;
}

/* ---------- Utility classes ---------- */
.flex       { display: flex; }
.flex-col   { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2  { gap: 8px; }
.gap-3  { gap: 12px; }
.gap-4  { gap: 16px; }
.gap-6  { gap: 24px; }
.w-full { width: 100%; }

.mt-1  { margin-top: 4px;  }
.mt-2  { margin-top: 8px;  }
.mt-4  { margin-top: 16px; }
.mt-6  { margin-top: 24px; }
.mb-2  { margin-bottom: 8px;  }
.mb-4  { margin-bottom: 16px; }
.mb-6  { margin-bottom: 24px; }

.text-sm    { font-size: 13px; }
.text-xs    { font-size: 11px; }
.text-lg    { font-size: 18px; }
.text-xl    { font-size: 22px; }
.font-bold  { font-weight: 700; }
.font-semibold { font-weight: 600; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-primary-color { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger  { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-center  { text-align: center; }
.text-right   { text-align: right; }

.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hidden   { display: none; }

/* ---------- Pagination ---------- */
.pagination {
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: center;
  padding: 16px 0;
}

.pagination .btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ---------- File drop zone ---------- */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  color: var(--text-muted);
}

.drop-zone:hover, .drop-zone.drag-over {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

.drop-zone svg { margin: 0 auto 12px; display: block; }
.drop-zone p { font-size: 14px; }
.drop-zone span { font-size: 12px; color: var(--text-muted); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .sidebar { width: var(--sidebar-w-col); }
  .sidebar-logo-text, .sidebar-section-label,
  .nav-item span, .nav-badge,
  .sidebar-user-info, .sidebar-logout span { display: none; }
  .sidebar-logo { padding: 20px; justify-content: center; }
  .sidebar-section { padding: 12px 8px 4px; }
  .nav-item { justify-content: center; padding: 12px; }
  .sidebar-footer { padding: 12px 8px; }
  .sidebar-user { justify-content: center; }
  .main { margin-left: var(--sidebar-w-col); }
}

@media (max-width: 768px) {
  .content { padding: 20px 16px; }
  .topbar  { padding: 0 16px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .form-grid-2, .form-grid-3 { grid-template-columns: 1fr; }
  .login-box { padding: 32px 24px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
}

/* ---------- Scrollbar global ---------- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ---------- Section headers ---------- */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.section-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 3px;
}

/* ---------- Tooltip ---------- */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: #1a1a2e;
  color: #fff;
  font-size: 12px;
  font-weight: 500;
  padding: 5px 10px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s;
  z-index: 200;
}

[data-tooltip]:hover::after { opacity: 1; }

/* ---------- Session status banner ---------- */
.session-banner {
  background: linear-gradient(135deg, var(--primary) 0%, #0044cc 100%);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
  box-shadow: 0 8px 24px rgba(0,85,255,0.3);
}

.session-banner-icon {
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,0.15);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.session-banner-text h3 { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.session-banner-text p  { font-size: 13px; opacity: 0.8; }
.session-banner-action { margin-left: auto; flex-shrink: 0; }

.btn-white {
  background: #fff;
  color: var(--primary);
  border-color: #fff;
  font-weight: 700;
}

.btn-white:hover {
  background: rgba(255,255,255,0.9);
  color: var(--primary-dark);
}

/* ---------- Resource list ---------- */
.resource-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 8px;
  transition: var(--transition);
  background: var(--bg-card);
}

.resource-item:hover { border-color: var(--primary-light); background: var(--bg-hover); }

.resource-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.resource-icon.pdf   { background: #fee2e2; color: #dc2626; }
.resource-icon.video { background: #f3e8ff; color: #7c3aed; }
.resource-icon.link  { background: var(--info-bg); color: var(--info); }

.resource-info { flex: 1; min-width: 0; }
.resource-name { font-size: 14px; font-weight: 600; color: var(--text-primary); truncate; }
.resource-meta { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

.resource-check {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--success-bg);
  color: var(--success);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ---------- Confirmation dialog ---------- */
.confirm-dialog {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  display: none;
}

.confirm-dialog.open { display: flex; }

.confirm-box {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 32px;
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.confirm-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.confirm-icon.danger { background: var(--danger-bg); color: var(--danger); }
.confirm-icon.warning { background: var(--warning-bg); color: var(--warning); }

.confirm-title { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.confirm-text  { font-size: 14px; color: var(--text-muted); margin-bottom: 24px; }
.confirm-actions { display: flex; gap: 12px; justify-content: center; }