/* ==========================================================================
   Abhyasam Career Academy - Admin Control Panel Stylesheet
   Modern, Accessible, High-Performance Dashboard UI
   ========================================================================== */

:root {
  --admin-primary: #0b1138;
  --admin-accent: #7c3aed;
  --admin-accent-hover: #6d28d9;
  --admin-secondary: #0ea5e9;
  --admin-success: #10b981;
  --admin-warning: #f59e0b;
  --admin-danger: #ef4444;
  --admin-bg: #f8fafc;
  --admin-card-bg: #ffffff;
  --admin-border: #e2e8f0;
  --admin-border-focus: #7c3aed;
  --admin-text-main: #0f172a;
  --admin-text-muted: #64748b;
  --admin-radius-sm: 6px;
  --admin-radius-md: 10px;
  --admin-radius-lg: 16px;
  --admin-shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --admin-shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --admin-shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.03);
  --admin-sidebar-width: 260px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--admin-bg);
  color: var(--admin-text-main);
  line-height: 1.5;
  min-height: 100vh;
}

/* ==========================================================================
   Login Screen Overlay
   ========================================================================== */
.admin-login-overlay {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at center, #1e1b4b 0%, #0b1138 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 99999;
  padding: 20px;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.admin-login-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.login-card {
  background: #ffffff;
  border-radius: var(--admin-radius-lg);
  padding: 40px;
  max-width: 420px;
  width: 100%;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  text-align: center;
}

.login-card .brand-img {
  max-width: 180px;
  margin-bottom: 20px;
}

.login-card h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--admin-primary);
  margin-bottom: 8px;
}

.login-card p {
  font-size: 0.9rem;
  color: var(--admin-text-muted);
  margin-bottom: 24px;
}

.pin-input-group {
  margin-bottom: 20px;
  text-align: left;
}

.pin-input-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--admin-text-main);
}

.pin-input-group input {
  width: 100%;
  padding: 12px 16px;
  font-size: 1.1rem;
  letter-spacing: 2px;
  border: 1.5px solid var(--admin-border);
  border-radius: var(--admin-radius-md);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  text-align: center;
}

.pin-input-group input:focus {
  border-color: var(--admin-accent);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}

.login-btn {
  width: 100%;
  padding: 14px;
  background: var(--admin-accent);
  color: #fff;
  border: none;
  border-radius: var(--admin-radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.2s;
}

.login-btn:hover {
  background: var(--admin-accent-hover);
}

.login-error {
  margin-top: 14px;
  color: var(--admin-danger);
  font-size: 0.85rem;
  font-weight: 600;
  display: none;
}

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

/* Sidebar */
.admin-sidebar {
  width: var(--admin-sidebar-width);
  background: #ffffff;
  border-right: 1px solid var(--admin-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 24px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--admin-border);
}

.sidebar-header img {
  height: 38px;
}

.sidebar-nav {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-tab-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--admin-radius-md);
  color: var(--admin-text-muted);
  font-size: 0.92rem;
  font-weight: 600;
  background: transparent;
  border: none;
  cursor: pointer;
  width: 100%;
  text-align: left;
  transition: all 0.2s;
}

.nav-tab-btn i {
  font-size: 1rem;
  width: 20px;
  text-align: center;
  color: var(--admin-text-muted);
  transition: color 0.2s;
}

.nav-tab-btn:hover {
  background: #f1f5f9;
  color: var(--admin-primary);
}

.nav-tab-btn:hover i {
  color: var(--admin-accent);
}

.nav-tab-btn.active {
  background: #f5f3ff;
  color: var(--admin-accent);
}

.nav-tab-btn.active i {
  color: var(--admin-accent);
}

.nav-badge-pill {
  margin-left: auto;
  background: #fee2e2;
  color: #ef4444;
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 12px;
  font-weight: 700;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--admin-border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.view-site-link, .logout-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: var(--admin-radius-sm);
  text-decoration: none;
  cursor: pointer;
}

.view-site-link {
  color: var(--admin-accent);
  background: #f5f3ff;
}

.logout-btn {
  color: var(--admin-danger);
  background: #fef2f2;
  border: none;
  width: 100%;
}

/* Main Content Area */
.admin-main {
  margin-left: var(--admin-sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Top App Bar */
.admin-topbar {
  height: 68px;
  background: #ffffff;
  border-bottom: 1px solid var(--admin-border);
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 90;
}

.topbar-title h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--admin-primary);
}

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

/* Button variants */
.btn-admin {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--admin-radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-admin-primary {
  background: var(--admin-accent);
  color: #fff;
}
.btn-admin-primary:hover {
  background: var(--admin-accent-hover);
}

.btn-admin-secondary {
  background: #f1f5f9;
  color: var(--admin-text-main);
  border: 1px solid var(--admin-border);
}
.btn-admin-secondary:hover {
  background: #e2e8f0;
}

.btn-admin-success {
  background: var(--admin-success);
  color: #fff;
}
.btn-admin-success:hover {
  background: #059669;
}

.btn-admin-danger {
  background: var(--admin-danger);
  color: #fff;
}
.btn-admin-danger:hover {
  background: #dc2626;
}

.btn-icon-sm {
  padding: 6px 10px;
  font-size: 0.8rem;
}

/* Tab Panels */
.tab-content-container {
  padding: 32px;
  flex: 1;
}

.tab-panel {
  display: none;
  animation: fadeIn 0.25s ease-out;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

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

.stat-card {
  background: #ffffff;
  border: 1px solid var(--admin-border);
  border-radius: var(--admin-radius-lg);
  padding: 20px;
  box-shadow: var(--admin-shadow-sm);
  display: flex;
  align-items: center;
  gap: 16px;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.stat-icon.purple { background: #f3e8ff; color: #7c3aed; }
.stat-icon.blue { background: #e0f2fe; color: #0284c7; }
.stat-icon.emerald { background: #d1fae5; color: #059669; }
.stat-icon.amber { background: #fef3c7; color: #d97706; }
.stat-icon.rose { background: #ffe4e6; color: #e11d48; }

.stat-info h3 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--admin-primary);
  line-height: 1.1;
}

.stat-info p {
  font-size: 0.82rem;
  color: var(--admin-text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Section Header in Tabs */
.section-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.section-top-bar h2 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--admin-primary);
}

.section-top-bar p {
  font-size: 0.88rem;
  color: var(--admin-text-muted);
}

/* Content Cards & Forms */
.admin-card {
  background: #ffffff;
  border: 1px solid var(--admin-border);
  border-radius: var(--admin-radius-lg);
  padding: 24px;
  box-shadow: var(--admin-shadow-sm);
  margin-bottom: 24px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.form-grid.single-col {
  grid-template-columns: 1fr;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group.col-span-2 {
  grid-column: span 2;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--admin-text-main);
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 10px 14px;
  font-size: 0.92rem;
  font-family: inherit;
  border: 1px solid var(--admin-border);
  border-radius: var(--admin-radius-md);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  background: #ffffff;
  color: var(--admin-text-main);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--admin-accent);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.12);
}

.form-group textarea {
  min-height: 90px;
  resize: vertical;
}

/* Tables for Management */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--admin-radius-md);
  border: 1px solid var(--admin-border);
  background: #fff;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.admin-table th {
  background: #f8fafc;
  padding: 14px 16px;
  font-weight: 700;
  color: var(--admin-text-muted);
  border-bottom: 1px solid var(--admin-border);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.admin-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--admin-border);
  vertical-align: middle;
}

.admin-table tr:last-child td {
  border-bottom: none;
}

.admin-table tr:hover td {
  background: #f8fafc;
}

.table-badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 700;
}

.badge-purple { background: #f3e8ff; color: #7c3aed; }
.badge-blue { background: #e0f2fe; color: #0284c7; }
.badge-emerald { background: #d1fae5; color: #059669; }

.table-actions {
  display: flex;
  gap: 8px;
}

/* Cards Grid for Classes, Boards, Reviews */
.items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.item-card {
  background: #ffffff;
  border: 1px solid var(--admin-border);
  border-radius: var(--admin-radius-lg);
  padding: 20px;
  box-shadow: var(--admin-shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  position: relative;
}

.item-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.item-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--admin-primary);
}

.item-card-badge {
  font-size: 0.75rem;
  background: #f1f5f9;
  color: var(--admin-text-muted);
  padding: 3px 8px;
  border-radius: 6px;
  font-weight: 600;
}

.item-card-body {
  font-size: 0.88rem;
  color: var(--admin-text-muted);
  line-height: 1.45;
}

.item-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--admin-border);
}

/* Avatar Preview Pill */
.avatar-thumb-preview {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--admin-accent);
}

/* Modals */
.admin-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
}

.admin-modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.admin-modal {
  background: #ffffff;
  border-radius: var(--admin-radius-lg);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  transform: translateY(20px);
  transition: transform 0.25s ease;
}

.admin-modal-backdrop.open .admin-modal {
  transform: translateY(0);
}

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

.modal-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--admin-primary);
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 1.2rem;
  color: var(--admin-text-muted);
  cursor: pointer;
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  flex: 1;
}

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

/* Toast Notifications */
.admin-toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 999999;
}

.admin-toast {
  padding: 12px 20px;
  border-radius: var(--admin-radius-md);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: var(--admin-shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideInRight 0.3s ease-out;
}

.admin-toast.success { background: var(--admin-success); }
.admin-toast.error { background: var(--admin-danger); }
.admin-toast.info { background: var(--admin-accent); }

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Mobile Responsiveness */
.mobile-sidebar-toggle {
  display: none;
  background: transparent;
  border: none;
  font-size: 1.3rem;
  color: var(--admin-primary);
  cursor: pointer;
}

@media (max-width: 900px) {
  .admin-sidebar {
    transform: translateX(-100%);
  }
  .admin-sidebar.open {
    transform: translateX(0);
    box-shadow: 10px 0 25px rgba(0,0,0,0.15);
  }
  .admin-main {
    margin-left: 0;
  }
  .mobile-sidebar-toggle {
    display: block;
  }
  .form-grid {
    grid-template-columns: 1fr;
  }
  .form-group.col-span-2 {
    grid-column: span 1;
  }
  .tab-content-container {
    padding: 20px;
  }
}