/* =====================================================
   RESET BÁSICO E CONFIGURAÇÕES GERAIS
   ===================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scroll-behavior: smooth;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: #f4f4f4; /* fundo claro padrão */
  color: #333; /* texto padrão */
  line-height: 1.6;
}

/* =====================================================
   CABEÇALHO E NAVEGAÇÃO
   ===================================================== */
header {
  background-color: #0d1117;
  color: #fff;
  padding: 20px;
  position: sticky;
  top: 0;
  z-index: 10;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

nav h1 {
  font-size: 24px;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
}

nav ul li a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
  transition: color 0.3s;
}

nav ul li a:hover {
  color: #58a6ff;
}

/* =====================================================
   SEÇÃO HERO (INTRODUÇÃO)
   ===================================================== */
.hero {
  background: linear-gradient(to right, #0d1117, #1f2937);
  color: white;
  padding: 100px 20px;
  text-align: center;
}

.hero h2 {
  font-size: 2.5em;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.2em;
}

/* =====================================================
   SEÇÕES GERAIS
   ===================================================== */
section {
  padding: 60px 20px;
  max-width: 1000px;
  margin: 0 auto;
}

/* =====================================================
   TECNOLOGIAS E CARDS
   ===================================================== */
#tecnologias .cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.card {
  background-color: white;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.15);
}

.card h3 {
  color: #0d1117;
  margin-bottom: 10px;
}

/* =====================================================
   RODAPÉ
   ===================================================== */
footer {
  background-color: #0d1117;
  color: #ccc;
  text-align: center;
  padding: 20px;
}

footer a {
  color: #58a6ff;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* =====================================================
   RESPONSIVIDADE
   ===================================================== */
@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .hero h2 {
    font-size: 2em;
  }

  section {
    padding: 40px 15px;
  }
}

/* =====================================================
   TEMA ESCURO (DARK MODE)
   ===================================================== */
body.dark-mode {
  background-color: #0d1117; /* fundo geral escuro */
  color: white; /* texto claro */
}

body.dark-mode a {
  color: #58a6ff; /* links no dark mode */
}

/* Ajustes específicos para a section de tecnologias */
body.dark-mode #tecnologias {
  background-color: #161b22; /* fundo escuro */
  color: white;
}

/* Ajuste visual dos cards no dark mode */
body.dark-mode #tecnologias .card {
  background-color: #21262d; /* fundo do card */
  border: 1px solid #30363d;
  color: white;
}

body.dark-mode #tecnologias .card h3 {
  color: #58a6ff; /* título com destaque */
}

body.dark-mode #tecnologias .card p {
  color: #c9d1d9; /* texto mais claro */
}