* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: system-ui, -apple-system, sans-serif;
  background: #f5f7fa;
  color: #333;
  padding: 20px;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}
h1 {
  font-size: 1.8rem;
}
button {
  background: #4f46e5;
  color: white;
  border: none;
  padding: 8px 20px;
  border-radius: 6px;
  cursor: pointer;
}
button:hover {
  background: #4338ca;
}
#logoutBtn {
  background: #ef4444;
}
#logoutBtn:hover {
  background: #dc2626;
}
section {
  background: white;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 30px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
section h2 {
  margin-bottom: 16px;
  font-size: 1.3rem;
}
ul {
  list-style: none;
  padding: 0;
}
li {
  padding: 10px 0;
  border-bottom: 1px solid #eee;
}
li:last-child {
  border-bottom: none;
}
.login-container {
  max-width: 400px;
  margin: 80px auto;
  background: white;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.login-container h2 {
  text-align: center;
  margin-bottom: 24px;
}
.login-container input {
  width: 100%;
  padding: 12px;
  margin-bottom: 16px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 1rem;
}
.login-container button {
  width: 100%;
  padding: 12px;
  font-size: 1rem;
}