/* ==========================
   MAIN.CSS — Blog moderno e profissional
   ========================== */

/* ===== Variáveis de tema ===== */
:root {
  --bg: #f2f3f5;          /* fundo geral suave */
  --text: #1f1f1f;        /* texto principal */
  --subtext: #555;        /* texto secundário */
  --accent: #3b82f6;      /* azul suave */
  --card-bg: #ffffff;     /* cartões e header */
  --card-border: #dcdcdc; /* contorno leve */
  --font: 'Inter', system-ui, sans-serif;
}

:root.dark {
  --bg: #181a1f;
  --text: #e6e6e6;
  --subtext: #aaa;
  --accent: #60a5fa;
  --card-bg: #20242b;
  --card-border: #2d2f34;
}

/* ===== Reset & base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.75;
  min-height: 100%;
  font-size: 16px;
}

/* ===== Links ===== */
a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

a:hover {
  color: #2563eb;
}

/* ===== Header ===== */
header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--card-border);
  padding: 2rem 1rem 1.2rem;
  text-align: center;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

nav {
  margin-top: 0.5rem;
  text-align: center;

}

nav a {
  color: var(--subtext);
  margin: 0 1rem;
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  display: inline-block;
}

nav a:hover {
  color: var(--accent);
}

nav a::after {
  content: "";
  display: block;
  height: 2px;
  width: 0%;
  background: var(--accent);
  transition: width 0.3s ease;
  margin: 0.2rem auto 0;
}

nav a:hover::after {
  width: 100%;
}

/* ===== Layout ===== */
main {
  padding: 2.5rem 1.5rem;
  max-width: 780px;
  margin: auto;
}

/* ===== Artigos / Cards ===== */
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 0.75rem;
  padding: 2rem;
  margin-bottom: 2.5rem;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.card:hover {
  border-color: var(--accent);
}

.card h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  letter-spacing: -0.01em;
}

.card p {
  color: var(--subtext);
  margin-bottom: 1.2rem;
  font-size: 1rem;
}

/* ===== Citação / bloco destacado ===== */
blockquote {
  border-left: 4px solid var(--accent);
  padding-left: 1rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--subtext);
}

/* ===== Botões ===== */
button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.7rem 1.3rem;
  border-radius: 0.4rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s ease;
}

button:hover {
  background: #2563eb;
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.9rem;
  color: var(--subtext);
  border-top: 1px solid var(--card-border);
  background: var(--card-bg);
  margin-top: 3rem;
}

/* ===== Responsividade ===== */
@media (max-width: 600px) {
  header h1 {
    font-size: 1.6rem;
  }

  nav a {
    margin: 0 0.5rem;
  }

  main {
    padding: 2rem 1rem;
  }

  .card {
    padding: 1.5rem;
  }
}