:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: #1f2937;
  --bg-card-hover: #263345;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --border-color: #374151;
  --accent-blue: #3b82f6;
  --accent-blue-hover: #2563eb;
  --accent-green: #10b981;
  --accent-green-bg: rgba(16, 185, 129, 0.15);
  --accent-red: #ef4444;
  --accent-red-bg: rgba(239, 68, 68, 0.15);
  --accent-amber: #f59e0b;
  --accent-purple: #8b5cf6;
  --sidebar-width: 260px;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover {
  color: var(--accent-blue-hover);
}

.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 50;
}

.brand {
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-color);
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  color: #ffffff;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.nav-menu {
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 14px;
  transition: all 0.15s ease;
}

.nav-link:hover {
  background-color: var(--bg-card);
  color: var(--text-primary);
}

.nav-link.active {
  background-color: #2563eb;
  color: #ffffff;
}

.user-profile {
  padding: 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

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

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

/* Main Content */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: 32px 40px;
  max-width: 1440px;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}

.page-title {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
  text-decoration: none;
}

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

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background-color: var(--bg-card-hover);
}

.btn-danger {
  background-color: var(--accent-red);
  color: #ffffff;
}
.btn-danger:hover {
  background-color: #dc2626;
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

/* Stat Cards */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.stat-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.stat-card-title {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.stat-card-value {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.stat-card-sub {
  font-size: 12px;
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.text-positive {
  color: var(--accent-green) !important;
}
.text-negative {
  color: var(--accent-red) !important;
}
.bg-positive {
  background-color: var(--accent-green-bg);
  color: var(--accent-green);
}
.bg-negative {
  background-color: var(--accent-red-bg);
  color: var(--accent-red);
}

/* Data Tables */
.card-container {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 32px;
}

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

.card-title {
  font-size: 16px;
  font-weight: 600;
}

.table-wrapper {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.data-table th {
  background-color: rgba(31, 41, 55, 0.5);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table tbody tr:hover {
  background-color: rgba(31, 41, 55, 0.4);
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
}

.badge-tag {
  background-color: #374151;
  color: #d1d5db;
}

/* Forms */
.form-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 28px;
  max-width: 650px;
}

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

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

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 10px 14px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.15s ease;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* Alert Boxes */
.alert {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 14px;
}

.alert-danger {
  background-color: var(--accent-red-bg);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.alert-success {
  background-color: var(--accent-green-bg);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
}

/* Auth Page */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 36px 32px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
}