body {
  background: #f0f2f5;
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}
.container {
  background: #fff;
  border-radius: 20px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.1);
  padding: 40px 30px 30px 30px;
  width: 768px;
  height: 675px;
  justify-content: space-evenly;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}
.toggle-btns {
  display: flex;
  justify-content: space-between;
  margin-bottom: 30px;
}
.toggle-btns button {
  flex: 1;
  padding: 10px 0;
  background: none;
  border: none;
  font-size: 35px;
  font-weight: bold;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: border-color 0.2s;
}
.toggle-btns .active {
  border-bottom: 3px solid #007bff;
  color: #007bff;
}
.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 18px;
}
.form-group input {
  border: none;
  border-bottom: 2px solid #ccc;
  padding: 12px 0;
  font-size: 30px;
  width: 100%;
  outline: none;
  transition: border-color 0.2s;
  background: transparent;
}
.form-group input:focus {
  border-bottom: 2px solid #007bff;
}
.form-btn {
  background: #007bff;
  color: #fff;
  padding: 12px;
  border: none;
  border-radius: 8px;
  font-size: 28px;
  cursor: pointer;
  margin-top: 10px;
  transition: background 0.2s;
}
.form-btn:disabled {
  background: #cccccc;
  cursor: not-allowed;
}
.form-btn:hover:enabled {
  background: #0056b3;
}
.hidden {
  display: none;
}