:root {
  --bg-color: #0d1117;
  --bg-secondary: #161b22;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #1f6feb;
  --danger: #f85149;
  --danger-hover: #da3633;
  --success: #2ea043;
  --glass-bg: rgba(22, 27, 34, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-hover);
}

.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  border: none;
  font-size: 0.95rem;
}

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

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(88, 166, 255, 0.4);
}

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

.btn-danger:hover {
  background-color: var(--danger-hover);
  transform: translateY(-2px);
}

.input-field {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--glass-border);
  background-color: rgba(0, 0, 0, 0.2);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-field:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.2);
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.form-group {
  margin-bottom: 1.5rem;
}

.error-text {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 0.5rem;
  margin-bottom: 1rem;
}

.success-text {
  color: var(--success);
  font-size: 0.85rem;
  margin-top: 0.5rem;
  margin-bottom: 1rem;
}

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

.animate-fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}

.table-container {
  width: 100%;
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid var(--glass-border);
  background: var(--bg-secondary);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
}

.data-table th {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table tr:hover:not(:first-child) {
  background-color: rgba(255, 255, 255, 0.03);
}

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

/* Authentication Layout Backgrounds */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: radial-gradient(circle at 50% 50%, var(--bg-secondary) 0%, var(--bg-color) 100%);
  position: relative;
  overflow: hidden;
}

.auth-container::before {
  content: '';
  position: absolute;
  top: -20%;
  left: -10%;
  width: 50%;
  height: 50%;
  background: radial-gradient(circle, rgba(88, 166, 255, 0.15) 0%, transparent 70%);
  filter: blur(60px);
  z-index: 0;
}

.auth-box {
  width: 100%;
  max-width: 420px;
  position: relative;
  z-index: 1;
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: #fff;
}

.auth-header p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.auth-footer {
  margin-top: 1.5rem;
  text-align: center;
}

/* Dashboard Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
  background-color: var(--bg-color);
}

.sidebar {
  width: 260px;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
}

.sidebar-logo {
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--glass-border);
}

.sidebar-logo h2 {
  color: #fff;
  font-size: 1.3rem;
  margin: 0;
}

.badge {
  background-color: var(--accent);
  color: #fff;
  font-size: 0.65rem;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-weight: 700;
  text-transform: uppercase;
  display: inline-block;
}

.sidebar-nav {
  padding: 1.5rem 1rem;
  flex: 1;
}

.nav-item {
  display: block;
  padding: 0.85rem 1rem;
  color: var(--text-secondary);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  transition: all 0.2s;
  font-weight: 500;
  text-decoration: none;
}

.nav-item:hover, .nav-item.active {
  background-color: rgba(88, 166, 255, 0.1);
  color: var(--accent);
}

.sidebar-footer {
  padding: 1.5rem;
  border-top: 1px solid var(--glass-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.admin-info {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.logout-btn {
  background: transparent;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
}

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.app-header {
  height: 70px;
  display: flex;
  align-items: center;
  padding: 0 2rem;
  border-bottom: 1px solid var(--glass-border);
  background-color: var(--glass-bg);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.app-header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  color: #fff;
  margin: 0;
}

.content-wrapper {
  padding: 2rem;
  flex: 1;
  overflow-y: auto;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.stat-title {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.section-header h2 {
  font-size: 1.4rem;
  color: #fff;
}

.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-content {
  width: 100%;
  max-width: 450px;
  background: var(--bg-secondary);
  position: relative;
}

.modal-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: transparent;
  border: none;
  color: #fff;
  cursor: pointer;
  font-size: 1.2rem;
}