/* Reset mặc định */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f8f9fa;
  line-height: 1.6;
  padding: 20px;
}

/* ===== MENU ===== */
nav ul {
  list-style: none;
  background: #343a40;
  display: flex;
  padding: 10px;
  border-radius: 5px;
}

nav ul li {
  margin-right: 15px;
}

nav ul li a {
  text-decoration: none;
  color: #fff;
  font-weight: bold;
  padding: 6px 12px;
  border-radius: 4px;
  transition: 0.3s;
}

nav ul li a:hover {
  background: #495057;
}

/* ===== TIÊU ĐỀ ===== */
h1, h2 {
  margin: 20px 0;
  color: #09e7e7;
}

/* ===== FORM ===== */
form {
  max-width: 500px;
  margin: 20px auto;
  padding: 15px;
  border: 1px solid #ccc;
  border-radius: 5px;
  background: #ffffff;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

form label {
  font-weight: bold;
}

form input, form textarea {
  width: 100%;
  padding: 8px;
  margin: 8px 0 15px 0;
  border: 1px solid #ddd;
  border-radius: 4px;
}

form button {
  padding: 10px 15px;
  background: #28a745;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: 0.3s;
}

form button:hover {
  background: #218838;
}

/* ===== LIÊN HỆ ===== */
.contact {
  margin-top: 30px;
  background: #fff3cd;
  padding: 15px;
  border-left: 5px solid #0adb50;
  border-radius: 5px;
}