/* Basic CSS Boilerplate */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  font-family: Arial, sans-serif;
  background-color: #fff;
  height: 100%;
  width: 100%;
}

.container {
  width: 100%;
  height: 100vh;
  background: linear-gradient(135deg, #4203a9, #90bafc);
  color: #fff;
  padding: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.calculator {
  width: 100%;
  max-width: 520px;
  padding: 20px;
}

.calculator h1 {
  font-size: 48px;
  line-height: 1.1;
}

.calculator h1 span {
  color: #ffff76;
}

/* Input Box */
.input-box {
  margin: 30px 0;
  padding: 25px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.3);
  display: flex;
  align-items: center;
  gap: 15px;
}

.input-box input {
  flex: 1;
  padding: 12px 15px;
  border: 0;
  outline: 0;
  font-size: 18px;
  border-radius: 5px;
  position: relative;
}

.input-box button {
  background-color: #ffff76;
  border: 0;
  outline: 0;
  padding: 13px 25px;
  border-radius: 5px;
  font-weight: 500;
  color: #333;
  cursor: pointer;
}

/* Date picker fix */
.input-box input::-webkit-calendar-picker-indicator {
    position: absolute;
    right: 10px;
    width: 22px;
    height: 22px;
    cursor: pointer;
    opacity: 1;
}

/* Result */
#result {
  font-size: 22px;
  font-weight: 500;
}

#result span {
  color: #ffff76;
}

/* -------------------- */
/* Responsive Styling   */
/* -------------------- */

/* Tablets */
@media (max-width: 768px) {
  .calculator h1 {
    font-size: 40px;
  }

  .input-box {
    flex-direction: column;
    gap: 20px;
    padding: 20px;
  }

  .input-box button {
    width: 100%;
    font-size: 18px;
  }

  .input-box input {
    width: 100%;
  }
}

/* Mobile Phones */
@media (max-width: 480px) {
  .calculator h1 {
    font-size: 32px;
    text-align: center;
  }

  .input-box {
    padding: 15px;
    gap: 15px;
  }

  .input-box input {
    font-size: 16px;
    padding: 10px 12px;
  }

  .input-box button {
    padding: 12px;
    font-size: 16px;
    width: 100%;
  }

  #result {
    font-size: 18px;
    text-align: center;
  }
}