/* ===== VARIÁVEIS ===== */
:root {
  --primary-color: #0d6efd;
  --secondary-color: #6c757d;
  --success-color: #198754;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #0dcaf0;
  --light-color: #f8f9fa;
  --dark-color: #212529;
  --bg-light: #ffffff;
  --bg-dark: #1a1a1a;
  --text-light: #212529;
  --text-dark: #f8f9fa;
  --border-color: #dee2e6;
  --sidebar-width: 250px;
  --sidebar-collapsed-width: 70px;
  --header-height: 60px;
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-light);
  color: var(--text-light);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
}

/* ===== LAYOUT ===== */
.app-wrapper {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--dark-color);
  color: white;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  transition: var(--transition);
  z-index: 1000;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar .logo {
  padding: 20px;
  text-align: center;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar .logo h2 {
  color: white;
  font-size: 1.5rem;
  margin: 0;
}

.sidebar .nav {
  padding: 20px 0;
}

.sidebar .nav-item {
  list-style: none;
}

.sidebar .nav-link {
  display: flex;
  align-items: center;
  padding: 12px 20px;
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  transition: var(--transition);
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
  background: rgba(255,255,255,0.1);
  color: white;
}

.sidebar .nav-link i {
  width: 24px;
  margin-right: 10px;
  font-size: 1.2rem;
}

.sidebar.collapsed .nav-link span {
  display: none;
}

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

.main-content.expanded {
  margin-left: var(--sidebar-collapsed-width);
}

/* Topbar */
.topbar {
  height: var(--header-height);
  background: white;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 999;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.topbar-left {
  display: flex;
  align-items: center;
}

.menu-toggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--secondary-color);
  margin-right: 20px;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 15px;
}

.topbar-item {
  position: relative;
  cursor: pointer;
}

.notification-badge {
  position: absolute;
  top: -5px;
  right: -5px;
  background: var(--danger-color);
  color: white;
  border-radius: 50%;
  width: 18px;
  height: 18px;
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Content area */
.content {
  padding: 20px;
  flex: 1;
}

/* ===== CARDS ===== */
.card {
  background: white;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  padding: 20px;
  margin-bottom: 20px;
  transition: var(--transition);
}

.card:hover {
  box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0;
}

/* ===== STATS CARDS ===== */
.stats-card {
  background: linear-gradient(135deg, var(--primary-color), #0b5ed7);
  color: white;
  padding: 20px;
  border-radius: 10px;
  margin-bottom: 20px;
}

.stats-card .stats-icon {
  font-size: 2.5rem;
  opacity: 0.5;
}

.stats-card .stats-number {
  font-size: 2rem;
  font-weight: 700;
  margin: 10px 0;
}

.stats-card .stats-label {
  font-size: 0.9rem;
  opacity: 0.9;
}

/* ===== FORMS ===== */
.form-group {
  margin-bottom: 15px;
}

.form-label {
  display: block;
  margin-bottom: 5px;
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: 5px;
  font-size: 1rem;
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(13,110,253,0.25);
}

/* ===== TABLES ===== */
.table-responsive {
  overflow-x: auto;
}

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

.table th {
  text-align: left;
  padding: 12px;
  background: var(--light-color);
  font-weight: 600;
  border-bottom: 2px solid var(--border-color);
}

.table td {
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
}

.table tbody tr:hover {
  background: var(--light-color);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

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

.btn-primary:hover {
  background: #0b5ed7;
}

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

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

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

.btn-sm {
  padding: 5px 10px;
  font-size: 0.9rem;
}

/* ===== ALERTS ===== */
.alert {
  padding: 12px 20px;
  border-radius: 5px;
  margin-bottom: 20px;
}

.alert-success {
  background: #d1e7dd;
  border: 1px solid #badbcc;
  color: #0f5132;
}

.alert-danger {
  background: #f8d7da;
  border: 1px solid #f5c2c7;
  color: #842029;
}

.alert-warning {
  background: #fff3cd;
  border: 1px solid #ffecb5;
  color: #664d03;
}

/* ===== UTILITIES ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-primary { color: var(--primary-color); }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }
.text-warning { color: var(--warning-color); }

.bg-primary { background: var(--primary-color); }
.bg-success { background: var(--success-color); }
.bg-danger { background: var(--danger-color); }
.bg-warning { background: var(--warning-color); }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 2rem; }
.ml-1 { margin-left: 0.5rem; }
.mr-1 { margin-right: 0.5rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 2rem; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .sidebar {
    width: 0;
    left: -250px;
  }
  
  .sidebar.active {
    width: var(--sidebar-width);
    left: 0;
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .main-content.expanded {
    margin-left: 0;
  }
}