* {
  box-sizing: border-box;
  font-family: system-ui, sans-serif;
}

body {
  margin: 0;
  background: #f7f8fa;
  color: #222;
}

.container {
  max-width: 420px;
  margin: 60px auto;
  padding: 20px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.08);
  text-align: center;
}

h1 { margin-bottom: 6px; }

.subtitle {
  color: #666;
  margin-bottom: 24px;
}

.converter select,
.converter input {
  width: 100%;
  padding: 12px;
  margin-bottom: 10px;
  font-size: 16px;
}

.row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.row span {
  white-space: nowrap;
  color: #555;
}

button {
  width: 100%;
  padding: 12px;
  font-size: 16px;
  background: #2563eb;
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

button:hover { background: #1d4ed8; }

.result {
  margin-top: 18px;
  font-size: 18px;
  font-weight: bold;
}

.ad {
  margin: 16px 0;
  min-height: 60px;
}

footer {
  text-align: center;
  margin-top: 40px;
  color: #888;
  font-size: 14px;
}