* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f5f5f5;
  color: #333;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

main {
  background: #fff;
  padding: 2.5rem;
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  max-width: 480px;
  width: 100%;
  margin: 1rem;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

main > p {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  line-height: 1.4;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  margin-top: 1rem;
}

label:first-of-type {
  margin-top: 0;
}

input[type="url"],
input[type="text"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 0.95rem;
}

input:focus {
  outline: none;
  border-color: #4a90d9;
  box-shadow: 0 0 0 2px rgba(74, 144, 217, 0.2);
}

button[type="submit"] {
  margin-top: 1.25rem;
  width: 100%;
  padding: 0.7rem;
  background: #4a90d9;
  color: #fff;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

button[type="submit"]:hover {
  background: #3a7bc8;
}

button[type="submit"]:disabled {
  background: #a0c4e8;
  cursor: not-allowed;
}

#result {
  margin-top: 1.5rem;
  padding: 1rem;
  background: #e8f5e9;
  border-radius: 4px;
}

#result p {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.feed-url-row {
  display: flex;
  gap: 0.5rem;
}

.feed-url-row input {
  flex: 1;
  font-size: 0.85rem;
  background: #fff;
}

#copy-btn {
  padding: 0.6rem 1rem;
  background: #4a90d9;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  white-space: nowrap;
}

#copy-btn:hover {
  background: #3a7bc8;
}

.hint {
  color: #666;
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

#error {
  margin-top: 1.5rem;
  padding: 1rem;
  background: #fce4ec;
  color: #c62828;
  border-radius: 4px;
  font-size: 0.9rem;
}