body {
    font-family: Arial, sans-serif;
    margin: 40px;
    background-color: #f0f4f8;
    color: #333;
  }
  
  h1, h2 {
    color: #1f2937;
  }
  
  form {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    max-width: 400px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  }
  
  label, input {
    display: block;
    margin-bottom: 15px;
  }
  
  input[type="submit"], button {
    background-color: #2563eb;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
  }
  
  input[type="submit"]:hover, button:hover {
    background-color: #1d4ed8;
  }
  
  a {
    text-decoration: none;
    color: #2563eb;
  }
  
  a:hover {
    text-decoration: underline;
  }

.center-viewport {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #f3f6fa;
}

.logout-btn {
  position: absolute;
  top: 18px;
  right: 22px;
  background: transparent;
  color: #64748b;
  border: none;
  padding: 4px 10px;
  border-radius: 50%;
  font-size: 22px;
  font-weight: 400;
  box-shadow: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  z-index: 2;
  opacity: 0.7;
}
.logout-btn:hover {
  background: #e0e7ef;
  color: #1e293b;
  opacity: 1;
}

.container {
  position: relative;
  max-width: 480px;
  margin: 0 auto;
  background: #fff;
  padding: 40px 36px 28px 36px;
  border-radius: 16px;
  box-shadow: 0 6px 32px rgba(0,0,0,0.10);
  text-align: center;
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 10px;
  font-weight: 700;
}

.subtitle {
  color: #64748b;
  font-size: 1.1rem;
  margin-bottom: 30px;
}

.button-group.equal-buttons {
  display: flex;
  flex-direction: row;
  gap: 18px;
  justify-content: center;
  margin-top: 18px;
  margin-bottom: 18px;
}
.button-group.equal-buttons a, .button-group.equal-buttons button {
  flex: 1 1 0;
  min-width: 220px;
  max-width: 100%;
}
.button-group.equal-buttons button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 500;
  transition: box-shadow 0.2s, background 0.2s, transform 0.1s;
  box-shadow: 0 2px 8px rgba(37,99,235,0.10);
  border-radius: 8px;
  padding: 14px 0;
  min-height: 54px;
}
.button-group.equal-buttons button:active {
  box-shadow: 0 1px 2px rgba(37,99,235,0.12);
  transform: scale(0.98);
}
.button-group.equal-buttons button:hover {
  background-color: #1d4ed8;
}

.icon {
  font-size: 20px;
}

.gpt-info {
  background: #f0f4ff;
  color: #1e293b;
  border-radius: 8px;
  padding: 14px 18px;
  margin-top: 18px;
  font-size: 1rem;
  box-shadow: 0 1px 4px rgba(37,99,235,0.04);
}

@media (max-width: 700px) {
  .container {
    padding: 18px 6vw 18px 6vw;
  }
  .button-group.equal-buttons {
    flex-direction: column;
    gap: 14px;
  }
  .button-group.equal-buttons a, .button-group.equal-buttons button {
    min-width: 0;
  }
}