/* Estilos visuais melhorados para a plataforma IA Learning & Mentor */
:root {
  --primary: #007bff;
  --primary-dark: #0062cc;
  --secondary: #6c757d;
  --success: #28a745;
  --info: #17a2b8;
  --warning: #ffc107;
  --danger: #dc3545;
  --light: #f8f9fa;
  --dark: #343a40;
  --white: #ffffff;
}

body {
  font-family: 'Inter', sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f5f8fa;
  color: #333;
  line-height: 1.6;
}

body.dark {
  background-color: #1a202c;
  color: #f0f4f8;
}

/* Container principal */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

/* Header */
header {
  background-color: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 10px 0;
}

body.dark header {
  background-color: #2d3748;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

/* Navegação */
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-links {
  display: flex;
  gap: 20px;
}

.nav-link {
  color: var(--dark);
  text-decoration: none;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 4px;
  transition: all 0.2s;
}

.nav-link:hover {
  background-color: rgba(0, 123, 255, 0.1);
  color: var(--primary);
}

body.dark .nav-link {
  color: var(--light);
}

body.dark .nav-link:hover {
  background-color: rgba(0, 123, 255, 0.2);
}

/* Botões */
.btn {
  display: inline-block;
  font-weight: 500;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  user-select: none;
  border: 1px solid transparent;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  line-height: 1.5;
  border-radius: 0.25rem;
  transition: all 0.2s;
  cursor: pointer;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
}

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

.btn-outline {
  background-color: transparent;
  border-color: #ddd;
  color: #333;
}

body.dark .btn-outline {
  border-color: #4a5568;
  color: #e2e8f0;
}

/* Cards */
.card {
  background-color: var(--white);
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  padding: 20px;
  margin-bottom: 20px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

body.dark .card {
  background-color: #2d3748;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

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

.form-control {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  line-height: 1.5;
  color: #495057;
  background-color: #fff;
  background-clip: padding-box;
  border: 1px solid #ced4da;
  border-radius: 0.25rem;
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

body.dark .form-control {
  background-color: #4a5568;
  border-color: #2d3748;
  color: #e2e8f0;
}

/* Avatar */
.avatar {
  background-color: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  border-radius: 50%;
}

.avatar-sm {
  width: 32px;
  height: 32px;
  font-size: 14px;
}

.avatar-md {
  width: 48px;
  height: 48px;
  font-size: 18px;
}

.avatar-lg {
  width: 64px;
  height: 64px;
  font-size: 24px;
}

/* Utilitários */
.text-primary { color: var(--primary) !important; }
.text-secondary { color: var(--secondary) !important; }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-warning { color: var(--warning) !important; }
.text-info { color: var(--info) !important; }
.text-light { color: var(--light) !important; }
.text-dark { color: var(--dark) !important; }
.text-white { color: var(--white) !important; }

.bg-primary { background-color: var(--primary) !important; }
.bg-secondary { background-color: var(--secondary) !important; }
.bg-success { background-color: var(--success) !important; }
.bg-danger { background-color: var(--danger) !important; }
.bg-warning { background-color: var(--warning) !important; }
.bg-info { background-color: var(--info) !important; }
.bg-light { background-color: var(--light) !important; }
.bg-dark { background-color: var(--dark) !important; }
.bg-white { background-color: var(--white) !important; }

.my-1 { margin-top: 0.25rem !important; margin-bottom: 0.25rem !important; }
.my-2 { margin-top: 0.5rem !important; margin-bottom: 0.5rem !important; }
.my-3 { margin-top: 1rem !important; margin-bottom: 1rem !important; }
.my-4 { margin-top: 1.5rem !important; margin-bottom: 1.5rem !important; }
.my-5 { margin-top: 3rem !important; margin-bottom: 3rem !important; }

.mx-1 { margin-left: 0.25rem !important; margin-right: 0.25rem !important; }
.mx-2 { margin-left: 0.5rem !important; margin-right: 0.5rem !important; }
.mx-3 { margin-left: 1rem !important; margin-right: 1rem !important; }
.mx-4 { margin-left: 1.5rem !important; margin-right: 1.5rem !important; }
.mx-5 { margin-left: 3rem !important; margin-right: 3rem !important; }

.py-1 { padding-top: 0.25rem !important; padding-bottom: 0.25rem !important; }
.py-2 { padding-top: 0.5rem !important; padding-bottom: 0.5rem !important; }
.py-3 { padding-top: 1rem !important; padding-bottom: 1rem !important; }
.py-4 { padding-top: 1.5rem !important; padding-bottom: 1.5rem !important; }
.py-5 { padding-top: 3rem !important; padding-bottom: 3rem !important; }

.px-1 { padding-left: 0.25rem !important; padding-right: 0.25rem !important; }
.px-2 { padding-left: 0.5rem !important; padding-right: 0.5rem !important; }
.px-3 { padding-left: 1rem !important; padding-right: 1rem !important; }
.px-4 { padding-left: 1.5rem !important; padding-right: 1.5rem !important; }
.px-5 { padding-left: 3rem !important; padding-right: 3rem !important; }

.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }

.d-flex { display: flex !important; }
.flex-column { flex-direction: column !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-between { justify-content: space-between !important; }
.align-items-center { align-items: center !important; }

.w-100 { width: 100% !important; }
.h-100 { height: 100% !important; }

/* Tema escuro */
@media (prefers-color-scheme: dark) {
  body:not(.light-theme) {
    background-color: #1a202c;
    color: #f0f4f8;
  }
}