/* Reset básico */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  background-color: #f9f9f9;
  color: #333;
  padding: 0 1rem;
}
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem;
  background-color: #fff;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
header {
  background-color: #004d40;
  padding: 1rem 0;
  margin-bottom: 1rem;
}
header h1 a {
  color: #fff;
  text-decoration: none;
  font-size: 1.8rem;
  font-weight: bold;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
}
nav ul li a {
  color: #a7ffeb;
  text-decoration: none;
  font-weight: 600;
}
nav ul li a[aria-current="page"] {
  text-decoration: underline;
}
main h2 {
  margin-bottom: 1rem;
  color: #00796b;
}
article {
  margin-bottom: 1.5rem;
  border-bottom: 1px solid #ddd;
  padding-bottom: 1rem;
}
article h3, article h2 {
  color: #004d40;
  margin-bottom: 0.4rem;
}
article p {
  margin-bottom: 0.6rem;
}
time {
  font-size: 0.85rem;
  color: #666;
}
.highlighted-article {
  background-color: #e0f2f1;
  padding: 1rem;
  margin-bottom: 2rem;
  border-left: 5px solid #00796b;
}
.sidebar {
  background-color: #f1f8e9;
  padding: 1rem;
  margin-top: 2rem;
  border: 1px solid #c5e1a5;
}
.sidebar h3 {
  margin-bottom: 1rem;
  color: #33691e;
}
.sidebar ul {
  list-style-type: disc;
  padding-left: 1.2rem;
}
.sidebar ul li a {
  color: #558b2f;
  text-decoration: none;
}
.sidebar ul li a:hover {
  text-decoration: underline;
}
form label {
  font-weight: 600;
  margin-top: 0.8rem;
  display: block;
}
form input[type="text"],
form input[type="email"],
form textarea {
  width: 100%;
  padding: 0.5rem;
  margin-top: 0.25rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 1rem;
  font-family: inherit;
}
form button {
  margin-top: 1rem;
  padding: 0.6rem 1.2rem;
  background-color: #00796b;
  color: white;
  border: none;
  border-radius: 4px;
  font-weight: 700;
  cursor: pointer;
}
form button:hover {
  background-color: #004d40;
}
footer {
  text-align: center;
  padding: 1rem 0;
  margin-top: 2rem;
  background-color: #004d40;
  color: #a7ffeb;
  font-size: 0.9rem;
}
.article-navigation a {
  display: inline-block;
  margin-top: 1rem;
  color: #00796b;
  text-decoration: none;
  font-weight: 600;
}
.article-navigation a:hover {
  text-decoration: underline;
}
@media (min-width: 700px) {
  main {
    display: flex;
    gap: 2rem;
  }
  main > section, main > article {
    flex: 3 1 0%;
  }
  .sidebar {
    flex: 1 1 0%;
    margin-top: 0;
  }
}