* {
    box-sizing: border-box;
  }

  body {
   background: radial-gradient(circle, #7a8ba3 0%, #556678 100%);

    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 1rem;
  }

  form.bmi-calculator {
   background: linear-gradient(145deg, #f0f7ff, #c4d8ff);
    border-radius: 1.5rem;
    box-shadow:
      inset 8px 8px 15px rgba(70, 100, 160, 0.25),
      inset -8px -8px 15px rgba(255, 255, 255, 0.8),
      6px 6px 20px rgba(0, 0, 0, 0.1);
    width: 320px;
    padding: 2.5rem 2rem 3rem;
    display: flex;
    flex-direction: column;
    gap: 1.8rem;
    user-select: none;
    text-align: left;
  }

  h1 {
    background-color: transparent;
    padding: 0;
    margin: 0 0 1.2rem 0;
    font-size: 1.7rem;
    font-weight: 900;
    color: #39393b; 
    letter-spacing: 1.5px;
    user-select: none;
  }

  .calculator-display {
    position: relative;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(12px);
    border-radius: 1rem;
    height: 70px;
    box-shadow:
      inset 3px 3px 8px rgba(29, 3, 3, 0.5),
      inset -3px -3px 8px rgba(6, 23, 44, 0.35);
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: monospace;
    overflow: hidden;
  }

  .calculator-display::before {
    content: '';
    position: absolute;
    top: 12%;
    left: 15%;
    width: 60%;
    height: 25%;
    border-radius: 50% / 100%;
    pointer-events: none;
    filter: blur(4px);
  }

  .inputs {
    display: flex;
    gap: 1rem;
    justify-content: space-between;
  }

  .input-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
  }

  label {
    font-size: 0.85rem;
    color: #06070a;
    font-weight: 600;
    letter-spacing: 0.5px;
    user-select: none;
    padding-left: 6px;
  }

  input[type="number"] {
    background: #c8cfdb;
    border: none;
    border-radius: 0.9rem;
    padding: 0.5rem 1rem;
    font-size: 1.05rem;
    box-shadow:
      inset 6px 6px 10px rgba(70, 100, 160, 0.25),
      inset -6px -6px 10px rgba(255, 255, 255, 0.8);
    color: #16171a;
    transition: 0.25s ease;
    outline-offset: 2px;
  }

  input[type="number"]:focus {
    box-shadow:
      inset 6px 6px 14px rgba(50, 80, 140, 0.45),
      inset -6px -6px 20px rgba(255, 255, 255, 0.9),
      0 0 8px #4a90ff;
    background: #e9f0ff;
    color: #141720;
    outline: none;
  }

  input[type="number"]::-webkit-inner-spin-button,
  input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
  }

  button.calculate-btn {
    background: linear-gradient(145deg, #5f8cff, #2f5fd9);
    border: none;
    color: white;
    padding: 0.9rem 0;
    font-weight: 700;
    font-size: 1.15rem;
    border-radius: 1.2rem;
    box-shadow:
      0 6px 8px rgba(46, 95, 215, 0.6),
      inset 0 -3px 6px #26479b,
      inset 0 3px 6px #7ea6ff;
    cursor: pointer;
    transition: 0.15s ease;
    letter-spacing: 0.8px;
    text-shadow: 0 0 6px rgba(172, 205, 255, 0.85);
    filter: drop-shadow(0 0 3px #6fa4ff);
  }

  button.calculate-btn:hover {
    background: linear-gradient(145deg, #7aa4ff, #3a7aff);
    transform: translateY(-2.5px);
  }

  button.calculate-btn:active {
    transform: translateY(1.5px);
  }

  #result {
    margin-top: 5px;
    font-weight: 700;
    font-size: 1.4rem;
    color: #0c0d0e;
    text-align: center;
    min-height: 44px;
    user-select: none;
  }

  @media (max-width: 360px) {
    form.bmi-calculator {
      width: 90vw;
      padding: 2rem 1.2rem 3rem;
    }

    label {
      font-size: 0.75rem;
    }

    input[type="number"] {
      font-size: 0.95rem;
      padding: 0.45rem 0.9rem;
    }

    button.calculate-btn {
      font-size: 1rem;
      padding: 0.75rem 0;
      border-radius: 1rem;
    }
  }