/* ========== VARIÁVEIS GLOBAIS ========== */
:root {
  --primary-color: #3498db;
  --primary-color-dark: #2980b9;
  --secondary-color: #2c3e50;
  --accent-color: #e74c3c;
  --accent-color-light: #f8d7da;
  --success-color: #2ecc71;
  --success-color-light: #d4edda;
  --warning-color: #f39c12;
  --warning-color-light: #fff3cd;
  --info-color: #3498db;
  --info-color-light: #cce5ff;
  
  --light-bg: #f5f5f5;
  --dark-bg: #333;
  --white: #fff;
  --black: #000;
  --gray-100: #f8f9fa;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --gray-400: #ced4da;
  --gray-500: #adb5bd;
  --gray-600: #6c757d;
  --gray-700: #495057;
  --gray-800: #343a40;
  --gray-900: #212529;
  
  --font-family-base: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  --font-family-code: "Courier New", monospace;
  
  --border-radius-sm: 0.25rem;
  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;
  
  --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --box-shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
  --box-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
  
  --transition-base: all 0.2s ease-in-out;
  
  --sidebar-width: 250px;
  --header-height: 60px;
}

/* ========== RESET E ESTILOS BASE ========== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  line-height: 1.6;
  color: var(--gray-900);
  background-color: var(--light-bg);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  margin-bottom: 0.5rem;
  font-weight: 600;
  line-height: 1.2;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition-base);
}

a:hover {
  color: var(--primary-color-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ========== LAYOUT PRINCIPAL ========== */
header {
  background-color: var(--primary-color);
  color: var(--white);
  padding: 1rem 2rem;
  position: sticky;
  top: 0;
  box-shadow: var(--box-shadow);
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--header-height);
}

header h1 {
  font-size: 1.5rem;
  margin-bottom: 0;
}

.container {
  display: flex;
  min-height: calc(100vh - var(--header-height));
}

main {
  flex: 1;
  padding: 2rem;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

footer {
  background-color: var(--secondary-color);
  color: var(--white);
  text-align: center;
  padding: 1rem;
}

/* ========== NAVEGAÇÃO ========== */
nav {
  width: var(--sidebar-width);
  background-color: var(--secondary-color);
  color: var(--white);
  padding: 1rem;
  height: calc(100vh - var(--header-height));
  position: sticky;
  top: var(--header-height);
  overflow-y: auto;
  transition: var(--transition-base);
}

nav h3 {
  font-size: 1.2rem;
  margin: 1.5rem 0 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  padding-bottom: 0.5rem;
}

nav h3:first-child {
  margin-top: 0;
}

nav ul {
  list-style: none;
  margin-bottom: 1.5rem;
}

nav li {
  margin-bottom: 0.5rem;
}

nav a {
  color: var(--white);
  text-decoration: none;
  display: block;
  padding: 0.5rem;
  border-radius: var(--border-radius-sm);
  transition: background-color 0.3s;
}

nav a:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--white);
}

nav a.active {
  background-color: var(--primary-color);
  font-weight: bold;
}

.toggle-menu {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ========== COMPONENTES DE CONTEÚDO ========== */
/* Artigos */
article {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

article h2 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--primary-color);
  padding-bottom: 0.5rem;
  font-size: 2rem;
}

article h3 {
  color: var(--secondary-color);
  margin: 2rem 0 1rem;
  font-size: 1.5rem;
}

article h4 {
  font-size: 1.25rem;
  margin: 1.5rem 0 0.75rem;
}

article p {
  margin-bottom: 1rem;
}

article ul,
article ol {
  margin: 1rem 0 1rem 2rem;
}

article li {
  margin-bottom: 0.5rem;
}

/* Citações */
blockquote {
  border-left: 4px solid var(--accent-color);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background-color: var(--gray-100);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}

/* Código */
code {
  font-family: var(--font-family-code);
  background-color: var(--gray-400);
  padding: 0.2rem 0.4rem;
  border-radius: var(--border-radius-sm);
  font-size: 0.875em;
}

.code-header {
  background-color: var(--gray-700);
  color: var(--white);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-sm) var(--border-radius-sm) 0 0;
  font-size: 0.9rem;
  font-weight: bold;
  margin-top: 1.5rem;
  margin-bottom: 0;
}

pre {
  background-color: var(--gray-800);
  color: var(--white);
  padding: 1rem;
  border-radius: 0 0 var(--border-radius-sm) var(--border-radius-sm);
  overflow-x: auto;
  margin: 0 0 1.5rem 0;
}

pre code {
  background-color: transparent;
  padding: 0;
  color: inherit;
  font-size: 0.9rem;
}

/* Imagens */
.img-container {
  margin: 1.5rem 0;
}

.img-container img {
  border-radius: var(--border-radius-sm);
  box-shadow: var(--box-shadow);
  margin: 0 auto;
}

.img-caption {
  text-align: center;
  font-style: italic;
  color: var(--gray-600);
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

/* Tabelas */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
}

th, td {
  padding: 0.75rem;
  text-align: left;
  border: 1px solid var(--gray-300);
}

th {
  background-color: var(--primary-color);
  color: var(--white);
  font-weight: 600;
}

tr:nth-child(even) {
  background-color: var(--gray-100);
}

/* ========== COMPONENTES UTILITÁRIOS ========== */
/* Caixas de informação */
.info-box {
  background-color: var(--info-color-light);
  border-left: 4px solid var(--info-color);
  padding: 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}

.info-box h4 {
  color: var(--info-color);
  margin-top: 0;
  margin-bottom: 0.75rem;
}

.warning-box {
  background-color: var(--warning-color-light);
  border-left: 4px solid var(--warning-color);
}

.warning-box h4 {
  color: var(--warning-color);
}

.success-box {
  background-color: var(--success-color-light);
  border-left: 4px solid var(--success-color);
}

.success-box h4 {
  color: var(--success-color);
}

.error-box {
  background-color: var(--accent-color-light);
  border-left: 4px solid var(--accent-color);
}

.error-box h4 {
  color: var(--accent-color);
}

/* Desafios */
.desafio {
  background-color: var(--warning-color-light);
  border-left: 4px solid var(--warning-color);
  padding: 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}

.desafio h4 {
  color: var(--gray-800);
  margin-top: 0;
  margin-bottom: 0.75rem;
}

/* Detalhes/Resumo */
details {
  margin: 1rem 0;
}

summary {
  cursor: pointer;
  padding: 0.75rem;
  background-color: var(--gray-200);
  border-radius: var(--border-radius-sm);
  color: var(--primary-color);
  font-weight: 600;
  transition: var(--transition-base);
}

summary:hover {
  background-color: var(--gray-300);
}

details[open] summary {
  border-radius: var(--border-radius-sm) var(--border-radius-sm) 0 0;
}

.solution {
  margin-top: 0;
  padding: 1rem;
  background-color: var(--gray-100);
  border-radius: 0 0 var(--border-radius-sm) var(--border-radius-sm);
  border-left: 3px solid var(--success-color);
}

/* Timeline (Para aula de introdução ao JS) */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 2rem auto;
}

.timeline::after {
  content: "";
  position: absolute;
  width: 3px;
  background-color: var(--primary-color);
  top: 0;
  bottom: 0;
  left: 50%;
  margin-left: -1.5px;
}

.timeline-item {
  padding: 10px 40px;
  position: relative;
  width: 50%;
  box-sizing: border-box;
}

.timeline-item::after {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  background-color: var(--white);
  border: 3px solid var(--primary-color);
  border-radius: 50%;
  top: 15px;
  z-index: 1;
}

.timeline-left {
  left: 0;
}

.timeline-right {
  left: 50%;
}

.timeline-left::after {
  right: -13px;
}

.timeline-right::after {
  left: -13px;
}

.timeline-content {
  padding: 15px;
  background-color: var(--white);
  border-radius: var(--border-radius-sm);
  box-shadow: var(--box-shadow);
}

.timeline-year {
  font-weight: bold;
  color: var(--primary-color);
}

/* Professor profile */
.professor-perfil {
  display: flex;
  margin-bottom: 2rem;
  background-color: var(--gray-100);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  gap: 2rem;
}

.professor-foto img {
  border-radius: 50%;
  width: 180px;
  height: 180px;
  object-fit: cover;
  border: 3px solid var(--primary-color);
}

.professor-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.professor-cargo {
  color: var(--accent-color);
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.professor-social {
  margin-top: 1rem;
}

.social-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s;
}

.social-link:hover {
  color: var(--accent-color);
}

/* Grid layout utilities */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-cols-1 {
  grid-template-columns: 1fr;
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.card {
  background-color: var(--white);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  padding: 1.5rem;
  transition: var(--transition-base);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--box-shadow-md);
}

/* ========== RESPONSIVIDADE ========== */
@media (max-width: 992px) {
  .grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .container {
    flex-direction: column;
  }

  nav {
    width: 100%;
    height: auto;
    position: static;
    display: none;
    overflow: hidden;
  }

  nav.active {
    display: block;
  }

  .toggle-menu {
    display: block;
  }

  .grid-cols-2,
  .grid-cols-3 {
    grid-template-columns: 1fr;
  }

  .timeline::after {
    left: 31px;
  }

  .timeline-item {
    width: 100%;
    padding-left: 70px;
    padding-right: 25px;
  }

  .timeline-left::after,
  .timeline-right::after {
    left: 21px;
  }

  .timeline-right {
    left: 0;
  }

  .professor-perfil {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .professor-social {
    justify-content: center;
  }
}

@media (max-width: 576px) {
  header h1 {
    font-size: 1.25rem;
  }

  main {
    padding: 1.5rem 1rem;
  }

  .card {
    padding: 1rem;
  }
}

/* Utilitários para espaçamento e alinhamento */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.mx-auto { margin-left: auto; margin-right: auto; }

.p-0 { padding: 0; }
.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 3rem; }

/* Classes utilitárias para cores de fundo */
.bg-light { background-color: var(--light-bg); }
.bg-dark { background-color: var(--dark-bg); }
.bg-primary { background-color: var(--primary-color); }
.bg-secondary { background-color: var(--secondary-color); }
.bg-accent { background-color: var(--accent-color); }
.bg-success { background-color: var(--success-color); }
.bg-warning { background-color: var(--warning-color); }
.bg-gray { background-color: var(--gray-200); }

/* Classes utilitárias para cores de texto */
.text-light { color: var(--white); }
.text-dark { color: var(--gray-900); }
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--secondary-color); }
.text-accent { color: var(--accent-color); }
.text-success { color: var(--success-color); }
.text-warning { color: var(--warning-color); }
.text-muted { color: var(--gray-600); }