@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
    Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  margin: 40px 20px;
  background-color: #f7f9fc;
  color: #333;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.1);
  padding: 32px 28px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  font-weight: 600;
  margin-bottom: 20px;
  color: #1a202c;
}

input[type="file"] {
  width: 95%;
  padding: 14px 12px;
  border: 1.6px solid #cbd5e0;
  border-radius: 7px;
  font-size: 1rem;
  cursor: pointer;
  transition: border-color 0.2s ease-in-out;
  outline-offset: 2px;
}

input[type="file"]:focus {
  border-color: #3182ce;
  outline: none;
}

button {
  margin-top: 18px;
  width: 100%;
  padding: 14px 0;
  font-weight: 600;
  font-size: 1.1rem;
  background-color: #2b6cb0;
  color: white;
  border: none;
  border-radius: 7px;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(43, 108, 176, 0.35);
  transition: background-color 0.3s ease;
}

button:hover:not(:disabled) {
  background-color: #2c5282;
}

button:disabled {
  background-color: #a0aec0;
  cursor: not-allowed;
  box-shadow: none;
}

#error, #success {
  margin-top: 12px;
  width: 100%;
  font-weight: 500;
  text-align: center;
}

#error {
  color: #e53e3e;
}

#success {
  color: #3182ce;
}

.hidden {
  display: none;
}

.instructions {
  margin-top: 36px;
  width: 100%;
  border-top: 1px solid #e2e8f0;
  padding-top: 24px;
}

.instructions h2 {
  font-weight: 600;
  margin-bottom: 14px;
  color: #2d3748;
}

.instructions ul {
  list-style-type: disc;
  padding-left: 20px;
  color: #4a5568;
  font-size: 0.94rem;
  line-height: 1.5;
}

.instructions code {
  background-color: #edf2f7;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Courier New', Courier, monospace;
}

.instructions li {
  margin-bottom: 8px;
}