@layer reset, base, components, utilities;

/* 
Spacing 
0.5rem / 8px
1rem / 16px
1.25rem / 20px  
1.5rem / 24px
2rem / 32px
2.5rem / 40px
3rem / 48px
3.5rem / 56px
4rem / 64px
5rem / 80px
8rem / 128px    
12.5rem / 200px
*/

@layer reset {
  *,
  *::before,
  *::after {
    box-sizing: border-box;
  }

  /* https://kilianvalkhof.com/2022/css-html/your-css-reset-needs-text-size-adjust-probably/ */
  html {
    -moz-text-size-adjust: none;
    -webkit-text-size-adjust: none;
    text-size-adjust: none;
  }

  body {
    font-family: var(--ff-sans);
  }

  body,
  h1,
  h2,
  p {
    margin: 0;
  }

  p,
  li {
    text-wrap: pretty;
  }

  img {
    max-inline-size: 100%;
    display: block;
  }
}

@layer base {
  :root {
    /* colors */
    --cyan: hsl(177, 68%, 64%);
    --orange: hsl(12, 94%, 65%);
    --yellow: hsl(33, 100%, 70%);
    --white: hsl(20, 33%, 98%);
    --slate: hsl(244, 23%, 12%);

    /* font */
    --ff-sans: 'IBM Plex Sans', sans-serif;

    /* font weight */
    --fw-reg: 400;
    --fw-bold: 700;

    /* line height */
    --lh-1: 1;
    --lh-2: 1.5;
    --lh-3: 1.8;

    /* font size */
    --fs-text-1-bold: 5.5rem;
    --fs-text-2-bold: 4rem;
    --fs-text-3-bold: 2.5rem;
    --fs-text-4-reg: 1.25rem;
    --fs-text-5-bold: 1.125rem;
    --fs-text-5: 1.125rem;
    --fs-text-6-bold: 1rem;

    /* letter spacing */
    --ls-tight: -1px;
  }

  p {
    font-size: var(--fs-text-4-reg);
    line-height: var(--lh-2);
  }
}

@layer components {
  nav {
    padding-bottom: 3.5rem;
  }

  h1 {
    font-size: var(--fs-text-3-bold);
    font-weight: var(--fw-bold);
    line-height: 1.1;
    color: var(--slate);
    max-inline-size: 16ch;
  }

  header {
    background-image: url('./assets/bg-main-mobile.png');
    background-repeat: no-repeat;
    background-size: 150%;
    background-position: 5rem -15rem;
    padding: 2rem 0 0 0.5rem;
  }

  header .pattern {
    display: none;
  }

  header p {
    margin-top: 3rem;
    padding-bottom: 12.5rem;
    font-size: var(--fs-text-5);
    font-weight: 300;
    max-inline-size: 45ch;
  }

  .desktop-img {
    display: none;
  }

  .hero {
    padding: 1rem;
  }

  .app-img {
    position: absolute;
    z-index: 2;
    display: flex;
    justify-content: center;
    margin-top: -7.5rem;
    max-width: 215px;
  }

  .app-container {
    background-color: var(--slate);
    background-image: url('./assets/bg-pattern-2.svg');
    background-repeat: no-repeat;
    background-position: center top;
    height: 380px;
    display: flex;
    justify-content: center;
  }

  .premium-card {
    background-color: var(--orange);
    padding-bottom: 5rem;
  }

  .premium-card .downloads {
    padding: 2rem 1rem;
  }

  main h2 {
    font-size: var(--fs-text-3-bold);
    color: var(--slate);
    padding: 2rem 1rem 1rem 1rem;
  }

  .premium-card p:first-of-type {
    font-size: var(--fs-text-5);
    color: var(--slate);
    padding: 0 1rem 2rem 1rem;
    max-inline-size: 45ch;
  }

  .premium-card p:last-of-type {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-bottom: 1.5rem;
    color: var(--slate);
  }

  .premium-card span:first-child {
    font-size: var(--fs-text-2-bold);
    font-weight: var(--fw-bold);
    color: var(--slate);
    padding: 0 0 0 1rem;
  }

  .downloads {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-bottom: 7rem;
  }

  .downloads img {
    object-fit: contain;
  }

  .ios-btn,
  .android-btn {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.5rem;
    border-radius: 0.5rem;
    font-size: var(--fs-text-5-bold);
    font-weight: var(--fw-bold);
    text-decoration: none;
  }

  .ios-btn {
    background-color: var(--slate);
    color: var(--white);
  }

  .android-btn {
    background-color: var(--white);
    color: var(--slate);
  }

  .ios-btn:hover {
    background-color: var(--cyan);
    color: var(--slate);
    transition: 0.5s ease;
  }

  .android-btn:hover {
    background-color: var(--yellow);
    transition: 0.5s ease;
  }

  footer {
    margin-top: 2.5rem;
    padding: 1rem;
  }

  footer img:first-of-type {
    padding-bottom: 2rem;
  }

  footer p {
    font-size: var(--fs-text-4-reg);
  }

  footer a:nth-child(2) {
    text-decoration: none;
    color: var(--slate);
    font-weight: var(--fw-bold);
  }

  footer ul {
    display: flex;
    gap: 2rem;
    padding: 1rem 0 0 0;
  }

  footer li {
    list-style: none;
  }

  @layer utilities {
    .attribution {
      font-size: 11px;
      text-align: center;
      padding-bottom: 2rem;
    }
    .attribution a {
      color: hsl(228, 45%, 44%);
    }
  }
}

@media (min-width: 740px) {
  nav {
    padding-bottom: 3rem;
  }

  h1 {
    font-size: var(--fs-text-2-bold);
    padding: 1rem;
  }

  header {
    background-image: url('./assets/bg-main-tablet.png');
    background-repeat: no-repeat;
    background-size: contain;
    background-position: -10rem -5rem;
    min-width: 700px;
    position: relative;
  }

  header .pattern {
    position: absolute;
    top: -2.5rem;
    right: -2.5rem;
    width: clamp(250px, 34vw, 500px);
    display: inline-block;
  }

  header p {
    padding-left: 1rem;
    max-inline-size: 47ch;
  }

  header img {
    padding-left: 1rem;
  }

  main {
    padding-bottom: 12.5rem;
    margin: 0 1rem 0 1rem;
  }

  .desktop-img {
    display: none;
  }

  .app-container {
    position: relative;
    z-index: 1;
    border-radius: 1rem;
    background-position: left top;
    background-size: 250px;
    justify-content: start;
    height: 30rem;
  }

  .app-img {
    position: absolute;
    z-index: 3;
    margin-top: -5.5rem;
  }

  .premium-card {
    background: transparent;
    position: relative;
    margin: 2rem;
    padding-bottom: 6rem;
  }

  .app-container {
    border-radius: 1rem;
    padding-left: 2.5rem;
  }

  .ios-btn,
  .android-btn {
    padding: 1rem;
  }

  .tablet-card {
    position: absolute;
    right: 7rem;
    bottom: -6rem;
    width: 22rem;
    z-index: 2;
    background: var(--orange);
    color: var(--slate);
    border-radius: 1rem;
    padding: 0 1rem 0 1rem;
  }

  .site-footer {
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-areas:
      'footer-logo footer-logo'
      'contact-info socials';
  }

  .footer-logo {
    grid-area: footer-logo;
  }

  .contact-info {
    grid-area: contact-info;
  }

  .socials {
    grid-area: socials;
    justify-items: end;
  }

  .socials img {
    width: 24px; /* lock icon size */
    height: auto;
  }
}

@media (min-width: 1100px) {
  h1 {
    font-size: var(--fs-text-1-bold);
    max-inline-size: 18ch;
  }

  header {
    background-image: url(./assets/bg-main-desktop.png);
    background-size: cover;
    background-position: -10rem -5rem;
    padding: 3rem 1rem 0 3rem;
  }

  header .pattern {
    top: -1.5rem;
    right: -1.5rem;
    width: clamp(200px, 34vw, 230px);
  }

  .app-img {
    margin: -6.5rem 0 2rem 3rem;
    max-width: 255px;
  }

  .app-container {
    background-image: none;
  }

  .desktop-img {
    display: block;
    margin-left: 16.5rem;
    height: 24rem;
  }

  .tablet-card {
    bottom: -4rem;
    width: 28rem;
  }

  .site-footer {
    grid-template-columns: auto;
    grid-template-areas: 'footer-logo contact-info socials';
    padding: 0 2rem 0 2rem;
  }
}