* {
  box-sizing: border-box;
  font-family: 'Segoe UI', sans-serif;
}

body {
  margin: 0;
  background: #f4f4f4;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding: 40px 0;
}

.app {
  background: white;
  padding: 25px;
  width: 600px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.08);
  text-align: center;
}

h1 {
  margin-top: 0;
  margin-bottom: 20px;
}

button {
  padding: 10px 15px;
  margin: 5px;
  border: none;
  border-radius: 8px;
  background: #222;
  color: white;
  cursor: pointer;
  font-size: 14px;
}

button:hover {
  background: #444;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

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

th {
  background: #f7f7f7;
}