:root {
  --bg-base: #090a0f;
  --bg-surface: rgba(20, 22, 30, 0.6);
  --bg-card: rgba(28, 32, 45, 0.7);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.15);
  --text-main: #f0f2f5;
  --text-muted: #9ba1a6;
  --accent-color: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.5);
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --danger-color: #ef4444;
  --success-color: #10b981;
}

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

body {
  background-color: var(--bg-base);
  color: var(--text-main);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.08), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.08), transparent 25%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* Glassmorphism utils */
.glass-panel {
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* Login Screen */
.login-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.login-form {
  width: 100%;
  max-width: 420px;
  padding: 40px;
  text-align: center;
}

.login-form h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 8px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.login-form p {
  color: var(--text-muted);
  margin-bottom: 30px;
  font-size: 14px;
}

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

.input-group label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 500;
}

.input-group input {
  width: 100%;
  padding: 14px 16px;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-main);
  font-size: 15px;
  transition: all 0.2s;
  outline: none;
}

.input-group input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
  background: rgba(0, 0, 0, 0.4);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-family: inherit;
  outline: none;
}

.btn-primary {
  width: 100%;
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger-color);
  border: 1px solid rgba(239, 68, 68, 0.3);
  padding: 8px 16px;
  font-size: 13px;
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.25);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
}

.error-text {
  color: var(--danger-color);
  font-size: 13px;
  margin-top: 16px;
  min-height: 20px;
}

/* Admin Dashboard Layout */
.admin-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 280px;
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 10;
}

.sidebar-header {
  padding: 30px 24px;
}

.sidebar-header h1 {
  font-size: 22px;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

.sidebar-nav {
  flex: 1;
  padding: 0 16px;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 10px;
  margin-bottom: 8px;
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

.nav-item.active {
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-color);
  font-weight: 600;
}

.sidebar-footer {
  padding: 24px;
  border-top: 1px solid var(--border-color);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 16px;
}

.user-info {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-weight: 600;
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-role {
  font-size: 12px;
  color: var(--text-muted);
}

/* Main Content */
.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 40px;
  position: relative;
}

.page-header {
  margin-bottom: 30px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.tab-pane {
  display: none;
  animation: fadeIn 0.3s ease;
}

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

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.stat-card {
  padding: 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 3px;
  background: var(--accent-gradient);
  opacity: 0.5;
}

.stat-value {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 8px;
  line-height: 1.2;
}

.stat-label {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
}

/* Table Styles */
.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0 8px;
}

th {
  text-align: left;
  padding: 0 20px 12px;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

td {
  padding: 16px 20px;
  background: var(--bg-card);
}

td:first-child { border-top-left-radius: 12px; border-bottom-left-radius: 12px; }
td:last-child { border-top-right-radius: 12px; border-bottom-right-radius: 12px; }

tr {
  transition: transform 0.2s;
}

tbody tr:hover td {
  background: rgba(40, 45, 60, 0.8);
}

.user-cell {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-cell-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 14px;
  color: var(--text-muted);
}

.user-cell-info {
  display: flex;
  flex-direction: column;
}

.user-cell-name {
  font-weight: 600;
  font-size: 14px;
}

.user-cell-username {
  font-size: 12px;
  color: var(--text-muted);
}

.badge {
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.badge-admin {
  background: rgba(139, 92, 246, 0.15);
  color: #c4b5fd;
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.badge-user {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

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

.form-group label {
  display: block;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-main);
  font-size: 15px;
  transition: all 0.2s;
  outline: none;
}

.form-group input:focus {
  border-color: var(--accent-color);
  background: rgba(0, 0, 0, 0.3);
}

.search-bar {
  margin-bottom: 30px;
  position: relative;
}

.search-bar input {
  width: 100%;
  padding: 16px 20px 16px 50px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-main);
  font-size: 15px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  outline: none;
  transition: all 0.2s;
}

.search-bar input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.search-bar svg {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-light);
}

/* Responsive */
@media (max-width: 768px) {
  .admin-layout {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0;
  }
  .sidebar-header {
    padding: 20px;
  }
  .sidebar-nav {
    display: flex;
    overflow-x: auto;
    padding: 0 20px 20px;
    gap: 10px;
  }
  .nav-item {
    margin-bottom: 0;
    white-space: nowrap;
  }
  .sidebar-footer {
    display: none;
  }
  .main-content {
    padding: 20px;
  }
}