body {
  font-family: 'Inter', sans-serif;
  background-color: #f3f4f6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  background: white;
  border-radius: 16px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  padding: 24px;
  margin-top: 40px;
  flex: 1;
}

.input-box {
  width: 100%;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  padding: 0.5rem;
  margin-top: 4px;
  transition: border 0.2s, box-shadow 0.2s;
}

.input-box:focus {
  outline: none;
  border-color: #3b82f6;
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

textarea.output-box {
  width: 100%;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  padding: 12px;
  background-color: #f9fafb;
  font-family: 'Courier New', monospace;
  resize: none;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.btn-generate {
  background-color: #2563eb;
  color: white;
  padding: 0.5rem 1.5rem;
  border-radius: 8px;
  font-weight: 500;
  transition: background 0.2s;
}

.btn-generate:hover {
  background-color: #1d4ed8;
}

.btn-copy {
  background-color: #16a34a;
  color: white;
  padding: 0.5rem 1.5rem;
  border-radius: 8px;
  transition: background 0.2s;
}

.btn-copy:hover {
  background-color: #15803d;
}

.footer {
  margin-top: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: #dc2626;
  background-color: #f9fafb;
  border-top: 1px solid #d1d5db;
  padding: 1rem;
  box-shadow: inset 0 1px 4px rgba(0, 0, 0, 0.05);
}