/* Reset cơ bản */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, sans-serif;
  padding: 20px;
  background: #f7f7f7;
}

h1 {
  text-align: center;
  color: #333;
  margin-bottom: 20px;
}

/* Form tìm kiếm */
.search-box {
  max-width: 500px;
  margin: 0 auto 20px auto;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.search-box input {
  flex: 1 1 60%;
  padding: 10px;
  font-size: 16px;
  border-radius: 5px;
  border: 1px solid #ccc;
  min-width: 150px;
}

.search-box button {
  flex: 1 1 30%;
  padding: 10px;
  font-size: 16px;
  border-radius: 5px;
  border: none;
  background-color: #4CAF50;
  color: white;
  cursor: pointer;
  min-width: 100px;
}

.search-box button:hover {
  background-color: #45a049;
}

/* Kết quả */
.results {
  max-width: 90%;
  margin: 0 auto;
  background: white;
  border-radius: 5px;
  padding: 20px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  overflow-x: auto; /* Bảng cuộn ngang trên mobile */
}

.results table {
  width: 100%;
  border-collapse: collapse;
  min-width: 400px;
}

.results th, .results td {
  padding: 10px;
  border-bottom: 1px solid #ddd;
  text-align: left;
}

.results th {
  background-color: #f2f2f2;
}

.no-results {
  text-align: center;
  color: #888;
  padding: 20px;
}

/* Responsive cho Mobile */
@media (max-width: 600px) {
  h1 {
    font-size: 1.5rem;
  }

  .search-box input, .search-box button {
    flex: 1 1 100%;
  }

  .search-box {
    gap: 8px;
  }

  .results {
    padding: 10px;
  }

  .results th, .results td {
    padding: 8px;
    font-size: 14px;
  }
}

 /* nut quay lai  */

.btn-back {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 6px;
  background-color: #4CAF50;
  text-decoration: none;
  color: #000;
  cursor: pointer;
}

.btn-back:hover {
  background-color: #ddd;
}

.btn-back-container {
  margin-top: 15px;  /* cách nội dung phía trên */
  width: 100%;
  text-align: left;
}