{  margin: 0;
  padding: 0;
  box-sizing: border-box; 
 }

body {
  background: #f9d5e5;
  font-family: Arial, sans-serif;
  line-height: 1.4;
}

.container {
  display: grid;
  grid-template-columns: 220px 1fr 220px; /* trái - giữa - phải */
  gap: 15px;
  max-width: 1200px;
  margin: 20px auto;
  padding: 10px;
}

/* Sidebar và Extra */
.sidebar, .extra {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

/* Box chung */
.box {
  background: #fff;
  border: 2px solid #f48fb1;
  border-radius: 12px;
  padding: 15px;
  box-shadow: 2px 2px 6px rgba(0,0,0,.1);
}

/* Sidebar */
.sidebar h2 {
  font-size: 18px;
  margin-bottom: 10px;
  color: #d81b60;
}

.sidebar ul {
  list-style: none;
}

.sidebar ul li {
  margin-bottom: 8px;
}

.sidebar ul li a {
  text-decoration: none;
  color: #444;
}

.sidebar ul li a:hover {
  color: #d81b60;
}

.main-content {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.main-content h1 {
  color: #c2185b;
}

.main-content h2 {
  color: #ad1457;
}