* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: #f1f5f9;
  color: #0f172a;
}

.box {
  max-width: 500px;
  margin: 40px auto;
  padding: 25px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, .1);
}

h1 {
  font-size: 22px;
  margin-bottom: 6px;
}

.box > p {
  color: #64748b;
  margin-top: 0;
}

input {
  width: 100%;
  padding: 14px;
  margin-top: 12px;
  border: 1px solid #ccc;
  border-radius: 10px;
  font-size: 16px;
}

button {
  width: 100%;
  padding: 14px;
  margin-top: 15px;
  border: none;
  border-radius: 10px;
  background: #2563eb;
  color: #fff;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}

button a {
  color: #fff;
  text-decoration: none;
  display: block;
}

.link-btn {
  display: block;
  text-align: center;
  text-decoration: none;
  color: #fff;
  background: #0f172a;
  padding: 14px;
  border-radius: 10px;
  margin-top: 10px;
  font-weight: bold;
}

.link-btn:hover {
  background: #1e293b;
}

hr {
  border: none;
  border-top: 1px solid #e2e8f0;
  margin: 18px 0;
}

.result {
  margin-top: 10px;
}

.result p {
  margin: 8px 0;
}

.result.hidden {
  display: none;
}

.result ol {
  padding-left: 18px;
}

.result li {
  margin-bottom: 10px;
}

.result small {
  color: #94a3b8;
}

.back-link img {
  display: block;
  margin-bottom: 10px;
}

.error {
  color: #dc2626;
  font-weight: bold;
}