* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family:
    Segoe UI,
    Tahoma,
    sans-serif;
}
body {
  background: #eef2f7;
  color: #333;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}
.card {
  background: #fff;
  width: 100%;
  max-width: 460px;
  padding: 28px;
  border-radius: 14px;
  border: 1px solid #ddd;
}
h1 {
  text-align: center;
  margin-bottom: 6px;
}
.subtitle {
  text-align: center;
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 24px;
}
label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}
input {
  width: 100%;
  padding: 12px;
  border: 1px solid #cfcfcf;
  border-radius: 8px;
}
button {
  width: 100%;
  margin-top: 18px;
  padding: 12px;
  background: #2563eb;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  cursor: pointer;
  transition: 0.25s;
}
button:hover {
  background: #1d4ed8;
}
#error {
  color: #d11;
  margin-top: 10px;
  font-size: 0.9rem;
}
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 24px;
}
.box {
  background: #f5f7fb;
  border: 1px solid #e2e8f0;
  padding: 18px;
  border-radius: 10px;
  text-align: center;
}
.box span {
  display: block;
  font-size: 28px;
  font-weight: 700;
}
.box small {
  color: #666;
}
.details {
  margin-top: 20px;
  line-height: 1.8;
}
.hidden {
  display: none;
}
@media (max-width: 500px) {
  .grid {
    grid-template-columns: 1fr;
  }
}