:root {
  /* Premium Dark Mode Colors */
  --bg-main: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-hover: rgba(51, 65, 85, 0.8);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --success: #10b981;
  --danger: #ef4444;
  --border: rgba(255, 255, 255, 0.1);
  --glass-blur: blur(12px);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --radius: 12px;
  --transition: all 0.3s ease;
  color-scheme: dark;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  background-image: radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.08), transparent 25%),
                    radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.08), transparent 25%);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
}

/* Layout */
.app-container {
  display: flex;
  width: 100%;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  padding: 0 1.5rem 1.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-accent {
  color: var(--primary);
}

.nav-menu {
  list-style: none;
  flex: 1;
}

.nav-item {
  padding: 0.25rem 1rem;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius);
  transition: var(--transition);
  font-weight: 500;
}

.nav-link:hover, .nav-link.active {
  background: var(--bg-hover);
  color: var(--text-main);
}

.nav-link.active {
  border-left: 3px solid var(--primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(59, 130, 246, 0.1);
}

.user-profile {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.user-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.user-role {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: capitalize;
  margin-bottom: 0.75rem;
}

/* Main Content */
.main-content {
  flex: 1;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

h1 {
  font-size: 1.8rem;
  font-weight: 700;
}

h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* Cards */
.card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}

/* Data Table */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

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

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

th {
  background: rgba(0, 0, 0, 0.2);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

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

.btn-danger:hover {
  background: var(--danger);
  color: white;
}

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

.btn-outline:hover {
  background: var(--bg-hover);
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
}

/* Badges */
.badge {
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-admin {
  background: rgba(239, 68, 68, 0.15);
  color: #fca5a5;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-user {
  background: rgba(59, 130, 246, 0.15);
  color: #93c5fd;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

/* Form Elements */
.form-group {
  margin-bottom: 1rem;
}

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

.form-control {
  width: 100%;
  padding: 0.6rem 0.8rem;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-main);
  font-size: 0.95rem;
  transition: var(--transition);
  color-scheme: dark;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.25);
}

/* Select: aparência alinhada ao tema (lista nativa no Windows fica clara sem isso) */
select.form-control {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-color: #1e293b;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1rem;
  padding-right: 2.5rem;
  cursor: pointer;
}

select.form-control option,
select.form-control optgroup {
  background-color: #1e293b;
  color: #f8fafc;
}

/* Alerts */
.alert {
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.alert-success {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.35);
  color: #a7f3d0;
}

.alert-error {
  background: rgba(239, 68, 68, 0.12);
  border-color: rgba(239, 68, 68, 0.35);
  color: #fca5a5;
}

/* Spinner dos botões de ação demorada (Sienge) */
.spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s ease-in-out infinite;
  margin-right: 6px;
  vertical-align: middle;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Utilities */
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }
.grow { flex: 1; }
.w-full { width: 100%; }
.mt-4 { margin-top: 1rem; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }