/*-----------------
=======RESET=======
-----------------*/
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  font-family: system-ui, sans-serif;
  background-color: #fff;
  color: #000;
}

ul, ol {
  list-style: none;
}

a {
  text-decoration: none;
  color: inherit;
}

img {
  max-width: 100%;
  display: block;
}

input, button, textarea, select {
  font: inherit;
}

article, aside, footer, header, nav, section, main {
  display: block;
}


/*---------------------
=======VARIABLES=======
---------------------*/
:root {
/* base font */
--text-font: "Roboto", sans-serif;
--toxt-font-optical-sizing: auto;
--text-font-variation-settings: "wdth" 100;
--text-font-style: normal;
--text-size: 16px;
--text-weight: 700; /* bold */
--text-letter-spacing: 0px;
--text-line-height: 100%;

/* adjustments to base for sections */
--text-p1-size: 56px;
--text-p1mob-size: 40px;
--text-p2-line-height: 150%;
--text-p2reg-weight: 400; /* regular */
--text-p2reg-line-height: 150%;
--text-P3-size: 12px;
--text-p3-line-height: 150%;

/* colours and spacing */
--colour-white: #ffffff;
--colour-grey: #949494;
--colour-blue-700: #36384D;
--colour-blue-800: #242742;
--colour-light-red: #FFE7E6;
--colour-red: #FF6155;
--gradient-left: #FF6A3A;
--gradient-right: #FF527B;
--spacing-100: 0.5rem; /* 8px */
--spacing-200: 1rem; /* 16px */
--spacing-300: 1.5rem; /* 24px */
--spacing-400: 2rem; /* 32px */
--spacing-500: 2.5rem; /* 40px */
--spacing-600: 3rem; /* 48px */
--spacing-800: 4rem; /* 64px */
--sapcong-900: 4.5rem;/* 72px */
--spacing-1300: 6.5rem; /* 104px */
}

/*-------------------------
=======Mobile design=======
-------------------------*/
.hidden {
  display: none;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  
  font-family: var(--text-font);
  font-optical-sizing: var(--text-font-optical-sizing);
  font-variation-settings: var(--text-font-variation-settings);
  font-style: var(--text-font-style);
  font-size: var(--text-size);
  font-weight: var(--text-weight);
  letter-spacing: var(--text-letter-spacing);
  line-height: var(--text-line-height);
}

/* adjust fonts differ from base font */
.text-p1 {
  font-size: var(--text-p1mob-size);
}
.text-p2 {
  line-height: var(--text-p2-line-height);
}
.text-p2reg {
  line-height: var(--text-p2-line-height);
  font-weight: var(--text-p2reg-weight);
}
.text-p3 {
  font-size: var(--text-P3-size);
  line-height: var(--text-p2reg-line-height);
}

/* cards design */
.card-front-grid {
  display: grid;
  grid-template-columns: 1fr;
  justify-items: center;
}

.card-img {
  max-width: 100vw;
}

.card-copy {
  max-width: min(55ch, 88vw);
}

.card-h1 {
  margin-top: var(--spacing-500); /* 40px */
}

.card-p {
  margin: var(--spacing-300) auto; /* 24px */
}

.card-ul {
  list-style-image: url(./assets/images/icon-list.svg);
  list-style-position: outside;
  padding-left: var(--spacing-300); /* 24px */
}

.card-li {
  margin-bottom: var(--spacing-100); /* 8px */
  padding-left: var(--spacing-200); /* 16px */
  position: relative;
}

.card-li-sp {
  position: relative;
  top: -5px; /* bring text up to align to bullet image */
}

.card-copy form {
  margin-top: var(--spacing-500); /* 40px */
}

form {
  position: relative;
}

.label-error-ctr {
  display: flex;
  justify-content: space-between;
}

label {
  align-self:flex-start;
  margin-bottom: var(--spacing-100);
}

.error {
  display: inline-block;
  color: var(--colour-red);
}

input {
  height: 3.5rem;
  display: block;
  width: 100%;
  border: 1px solid var(--colour-grey);
  border-radius: var(--spacing-100);
  margin-bottom: var(--spacing-300); /* 24px */
  padding: var(--spacing-200) var(--spacing-300);
  color: var(--colour-grey);
}

.sub-btn,
.dis-btn {
  width: 100%;
  padding: var(--spacing-200) var(--spacing-600);
  border: none;
  border-radius: var(--spacing-100);
  background-color: var(--colour-blue-800);
  color: var(--colour-white);
  line-height: var(--text-p2-line-height);
  cursor: pointer;
}

/*---- card back -----*/

.card-back-inner {
  max-width: min(55ch, 88vw);
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.card-back-icon {
  width: 4rem;
  height: 4rem;
}

.card-back-h1 {
  font-size: var(--text-p1mob-size);
  line-height: var(--text-line-height);
  margin: var(--spacing-300) 0;
}

.card-back-p {
  font-weight: var(--text-p2reg-weight);
  line-height: var(--text-p2reg-line-height);
  margin-bottom: 8.18rem;
}

.sent-to-email {
  font-weight: var(--text-weight);
}


/*---- footer -----*/

.attribution { 
  font-size: 11px; 
  text-align: center;
  margin-top: 3rem; 
  padding: 1rem;
}

.attribution a { 
  color: var(--colour-red);
}

/*----------
=====JS=====
----------*/

.valid {
  outline: 1px solid green;
  color: green;
}

.invalid {
  outline: 1px solid var(--colour-red);
  color: var(--colour-red);
  background-color: var(--colour-light-red);
}

/*--------------------
=====Wide screens=====
--------------------*/

@media (min-width: 768px) {
  .card-img {
    max-width: 400px;
  }

  .text-p1 {
  font-size: var(--text-p1-size);
  }
}

@media (min-width: 1024px) {
  body {
    height: 100vh;
    background-color: var(--colour-blue-800);
  }

  .card-wrapper {
    background-color: var(--colour-white);
    padding: var(--spacing-300) var(--spacing-300);
    border-radius: 2rem;
    margin: auto;
  }

  .card-front-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .card-img {
    max-width: 528px;
    grid-column: 2/3;
  }

  .card-copy {
    grid-row: 1/2;
    grid-column: 1/2;
    max-width: min(40ch, 88vw);
    justify-self: start;
  }

  .card-h1 {
    line-height: var(--text-line-height);
    margin-top: 4.46rem;
  }

  .card-p {
    margin: var(--spacing-400) auto /* 32px */
  }

  .card-ul {
    margin-bottom: var(--spacing-300); /* 32px */
  }

  .sub-btn {
    background-image: linear-gradient(to right, var(--gradient-left) , var(--gradient-right));
  }

  .card-back-inner {
    width: 504px;
    height: 520px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--spacing-800);
  }

  .card-back-h1 {
    margin: var(--spacing-300) 0;
  }

  .card-back-p {
    margin-bottom: var(--spacing-300);
  }

  .sent-to-email {
    font-weight: var(--text-weight);
  }

  .attribution { 
  color: var(--colour-white);
  }
}