:root {
  --bg-1: #0d1117;
  --bg-2: #1b2735;
  --card: rgba(33, 38, 45, 0.95);
  --card-soft: rgba(45, 51, 59, 0.9);
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --accent-2: #2ea043;
  --border: #30363d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, var(--bg-1), var(--bg-2));
  color: var(--text);
  line-height: 1.6;
}

header {
  text-align: center;
  padding: 3rem 1rem;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

header h1 {
  margin: 0;
  font-size: 2.2rem;
}

header p {
  margin-top: 0.8rem;
  font-size: 1rem;
  opacity: 0.95;
}

main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 1rem;
}

section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem 2rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.25);
}

h2 {
  margin-top: 0;
  color: var(--accent);
  border-left: 4px solid var(--accent);
  padding-left: 0.8rem;
  font-size: 1.3rem;
}

.bloco {
  background: var(--card-soft);
  border-radius: 10px;
  padding: 1rem;
  margin-top: 1rem;
}

details {
  margin-top: 1rem;
  background: var(--card-soft);
  border-radius: 10px;
  padding: 0.8rem 1rem;
}

summary {
  cursor: pointer;
  font-weight: bold;
  color: var(--accent);
}

.conteudo-oculto {
  margin-top: 0.8rem;
  color: var(--text);
}

footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: #161b22;
  font-size: 0.9rem;
}

@media (max-width: 600px) {
  header {
    padding: 2.2rem 1rem;
  }

  header h1 {
    font-size: 1.7rem;
  }

  main {
    padding: 0.8rem;
  }

  section {
    padding: 1.2rem 1rem;
  }

  h2 {
    font-size: 1.1rem;
  }
}

.nav-topo {
  margin-bottom: 1.5rem;
}

.acoes-finais {
  margin-top: 2rem;
  text-align: center;
}

.botao-home {
  display: inline-block;
  text-decoration: none;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff;
  font-weight: bold;
  padding: 0.9rem 1.2rem;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.botao-home:hover {
  transform: translateY(-2px);
  opacity: 0.95;
}

.explica {
  color: var(--text);
}

.bloco p {
  margin: 0 0 1rem;
}

.bloco p:last-child {
  margin-bottom: 0;
}

.lista-padrao {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.lista-padrao > li {
  background: var(--card-soft);
  border-radius: 10px;
  padding: 1rem;
  margin: 0.6rem 0;
}

.lista-interna {
  margin: 0.8rem 0 0 1.2rem;
  padding-left: 1rem;
}

.lista-interna li {
  margin-bottom: 0.4rem;
}

.tipcontent {
  margin-top: 0.8rem;
  padding: 0.9rem;
  border-radius: 8px;
  background: rgba(13, 17, 23, 0.7);
  border: 1px solid var(--border);
}

.tipcontent p {
  margin: 0 0 0.7rem;
}

.tipcontent p:last-child {
  margin-bottom: 0;
}

.lista-padrao > li strong {
  color: #d2a8ff;
}

pre {
  white-space: pre-wrap;
  margin: 0.8rem 0 0;
}

code {
  display: block;
  background: rgba(13, 17, 23, 0.7);
  color: #79c0ff;
  padding: 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  overflow-x: auto;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.card-link {
  display: block;
  text-decoration: none;
  background: var(--card-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.2rem;
  color: var(--text);
  box-shadow: 0 0 12px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.card-link:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 0 18px rgba(0, 0, 0, 0.28);
}

.card-link h3 {
  margin: 0 0 0.6rem;
  color: var(--accent);
  font-size: 1.1rem;
}

.card-link p {
  margin: 0;
  color: var(--text);
  font-size: 0.95rem;
}