* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f4f5f7;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #1f2430;
}

.card {
  background: #ffffff;
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  width: 100%;
  max-width: 420px;
  text-align: center;
}

h1 {
  margin-top: 0;
  font-size: 1.5rem;
}

p {
  color: #5a6072;
  margin-bottom: 1.5rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

input[type="file"] {
  display: none;
}

.drop-label {
  border: 2px dashed #c3c8d4;
  border-radius: 10px;
  padding: 2rem 1rem;
  cursor: pointer;
  color: #5a6072;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.drop-label.dragging {
  border-color: #4a6cf7;
  background: #eef1ff;
}

.drop-label:hover {
  border-color: #9aa1b3;
}

button {
  background: #4a6cf7;
  color: white;
  border: none;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.15s ease;
}

button:hover {
  background: #3a58d9;
}

a {
  display: inline-block;
  margin-top: 1rem;
  color: #4a6cf7;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}