body {
  font-family: system-ui, -apple-system, sans-serif;
  background: #f6f7fb;
  margin: 0;
  padding: 0;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 20px;
}

h1 {
  margin: 10px 0;
  font-size: 26px;
}

.description {
  color: #555;
  font-size: 14px;
  margin-bottom: 20px;
}

.tool-card {
  background: white;
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

input, button {
  width: 100%;
  padding: 10px;
  margin-bottom: 12px;
  font-size: 14px;
  border-radius: 6px;
  border: 1px solid #ddd;
  box-sizing: border-box;
}

button {
  background: #111827;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

.result {
  margin-top: 15px;
  font-weight: 600;
  font-size: 16px;
  text-align: center;
}

.ad-slot {
  margin: 20px 0;
  text-align: center;
  min-height: 90px;
  background: #f1f1f1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: #999;
  border-radius: 6px;
}

footer {
  margin-top: 40px;
  text-align: center;
  font-size: 12px;
  color: #777;
}