/* === Page background === */
body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: linear-gradient(135deg, #e8ecff, #f9fbff);
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

/* === Main card === */
.container {
  text-align: center;
  background: #fff;
  padding: 60px;
  border-radius: 22px;
  box-shadow: 0 8px 35px rgba(0, 0, 0, 0.1);
  width: 600px;
  max-width: 92%;
}

/* === Title === */
h1 {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 35px;
  color: #202020;
}

/* === Drop area === */
#drop-area {
  border: 3px dashed #bbb;
  padding: 70px 30px;
  border-radius: 18px;
  background-color: #fafafa;
  margin-bottom: 35px;
  transition: all 0.3s ease;
}

#drop-area:hover {
  border-color: #007BFF;
  background-color: #f0f6ff;
}

#fileStatus {
  font-size: 16px;
  color: #333;
  margin-bottom: 18px;
}

/* === Buttons === */
button {
  border: none;
  padding: 14px 30px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
}

/* Blue buttons (Select, Switch) */
#selectButton, #switchButton {
  background-color: #007BFF;
  color: #fff;
}

#selectButton:hover, #switchButton:hover {
  background-color: #0056b3;
}

/* 🟢 Green Convert button */
#convertButton {
  background-color: #28a745;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  padding: 16px 50px;
}

#convertButton:hover {
  background-color: #218838;
}

button:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

/* Buttons row */
.button-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}

/* === Message text === */
#message {
  margin-top: 25px;
  font-size: 16px;
  color: #333;
}

/* Optional: soft lift on hover */
.container:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}