:root {
  --chinese-violet_30: hsla(179, 100%, 47%, 0.3);
  --chinese-violet:rgb(0, 188, 205);
  --sonic-silver: hsl(0, 0%, 0%);
  --old-rose_30: hsla(213, 100%, 32%, 0.3);
  --ghost-white: hsl(233, 33%, 95%);
  --light-pink: hsl(187, 100%, 39%);
  --light-gray: hsl(0, 0%, 80%);
  --old-rose: hsl(198, 88%, 37%);
  --seashell: hsl(205, 100%, 97%);
  --charcoal: hsl(198, 57%, 21%);
  --white: hsl(0, 0%, 100%);


  --ff-philosopher: 'Poppins', sans-serif;
  --ff-poppins: 'Poppins', sans-serif;

  --fs-1: 4rem;
  --fs-2: 3.2rem;
  --fs-3: 2.7rem;
  --fs-4: 2.4rem;
  --fs-5: 2.2rem;
  --fs-6: 2rem;
  --fs-7: 1.8rem;

  --fw-500: 500;
  --fw-700: 700;

  --section-padding: 80px;

  --shadow-1: 4px 6px 10px hsla(231, 94%, 7%, 0.06);
  --shadow-2: 2px 0 15px 5px hsla(231, 94%, 7%, 0.06);
  --shadow-3: 3px 3px var(--chinese-violet);
  --shadow-4: 5px 5px var(--chinese-violet);

  --radius-5: 5px;
  --radius-10: -1px;

  --polygon: polygon(100% 29%,100% 100%,19% 99%,0 56%);

  --transition-1: 0.25s ease;
  --transition-2: 0.5s ease;
  --cubic-out: cubic-bezier(0.33, 0.85, 0.4, 0.96);

}



*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

li { list-style: none; }

a,
img,
span,
data,
input,
button,
textarea,
ion-icon { display: block; }

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

img { height: auto; }

input,
button,
textarea {
  background: none;
  border: none;
  font: inherit;
}

input,
textarea { width: 100%; }

button { cursor: pointer; }

address { font-style: normal; }

ion-icon { pointer-events: none; }

html {
  font-family: var(--ff-poppins);
  font-size: 10px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--white);
  color: var(--sonic-silver);
  font-size: 1.6rem;
  line-height: 1.8;
}

:focus-visible { outline-offset: 4px; }

::selection {
  background-color: var(--old-rose);
  color: var(--white);
}

::-webkit-scrollbar { width: 10px; }

::-webkit-scrollbar-track { background-color: hsl(0, 0%, 98%); }

::-webkit-scrollbar-thumb { background-color: hsl(0, 0%, 80%); }

::-webkit-scrollbar-thumb:hover { background-color: hsl(0, 0%, 70%); }



.container { padding-inline: 15px; }

.section { padding-block: var(--section-padding); }

.section:nth-child(odd) { background-color: var(--seashell); }

.section-subtitle {
  color: var(--old-rose);
  text-transform: uppercase;
  font-weight: var(--fw-700);
  letter-spacing: 4px;
  text-align: center;
}

.h1,
.h2,
.h3,
.tab-text {
  color: var(--charcoal);
  font-family: var(--ff-philosopher);
  line-height: 1.2;
}

.h1 { font-size: var(--fs-2); }

.h2 { font-size: var(--fs-3); }

.h3 { font-size: var(--fs-5); }

.section-text { font-size: var(--fs-7); }

.w-100 { width: 100%; }

.has-before,
.has-after {
  position: relative;
  z-index: 1;
}

.has-before::before,
.has-after::after {
  content: "";
  position: absolute;
}

.section-title { text-align: center; }

.grid-list {
  display: grid;
  gap: 25px;
}

.btn-link {
  color: var(--old-rose);
  font-weight: var(--fw-500);
  display: flex;
  align-items: center;
  gap: 5px;
  transition: var(--transition-1);
}

.btn-link:is(:hover, :focus) { color: var(--chinese-violet); }

.has-underline {
  position: relative;
  margin-block-end: 60px;
}

.has-underline .span {
  height: 2px;
  background-color: var(--old-rose_30);
  width: 200px;
  margin-inline: auto;
  margin-block-start: 30px;
}

.btn {
  padding: 12px 30px;
  transition: var(--transition-1);
}

.btn-primary {
  background-color: var(--old-rose);
  color: var(--white);
}

.btn-primary:is(:hover, :focus) { background-color: var(--chinese-violet); }

.btn-secondary {
  border: 1px solid var(--old-rose);
  color: var(--old-rose);
}

.btn-secondary:is(:hover, :focus) {
  background-color: var(--old-rose);
  color: var(--white);
}

.img-holder {
  aspect-ratio: var(--width) / var(--height);
  background-color: var(--light-gray);
}

.img-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.header {
  background-color: hsl(205, 100%, 97%);
  position: absolute;
  top: 10px;
  right: 10px;
  left: 10px;
  padding-block: 12px;
  z-index: 4;
  transition: var(--transition-2);
}

.header.active {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  filter: drop-shadow(var(--shadow-1));
  transform: translateY(-100%);
  transition: none;
  animation: slideIn 0.5s ease forwards;
}

@keyframes slideIn {
  0% { transform: translateY(-100%); }
  100% { transform: translateY(0); }
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--ff-philosopher);
  font-size: 4rem;
  color: var(--charcoal);
  line-height: 1;
}

.nav-toggle-btn {
  font-size: 40px;
  color: var(--charcoal);
}

.nav-toggle-btn ion-icon { --ionicon-stroke-width: 20px; }

.nav-toggle-btn.active .open,
.nav-toggle-btn .close { display: none; }

.nav-toggle-btn .open,
.nav-toggle-btn.active .close { display: block; }

.navbar {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background-color: var(--white);
  padding-inline: 15px;
  max-height: 0;
  overflow: hidden;
  visibility: hidden;
  transition: 0.25s var(--cubic-out);
}

.navbar.active {
  max-height: 300px;
  visibility: visible;
  transition-duration: 0.5s;
}

.navbar-list { margin-block-end: 10px; }

.navbar-link {
  color: rgb(82, 82, 82);
  font-weight: 480;
  padding-block: 8px;
  line-height: 1.5;
  transition: var(--transition-1);
  text-transform:uppercase;
}

.navbar-link:is(:hover, :focus) { color: var(--old-rose); }


.hero {
  padding-block-start: calc(var(--section-padding) + 60px);
  text-align: center;
}

.hero .container {
  display: grid;
  gap: 60px;
}

.hero .hero-title { margin-block: 10px 25px; }

.hero-banner {
  padding-inline-start: 30px;
  padding-block-end: 30px;
  max-width: 420px;
  margin-inline: auto;
}

.hero-banner .w-100 { border-radius: -1px 30px; }

.hero-banner::before {
  top: 30px;
  right: 30px;
  bottom: 0;
  left: 0;
  background-color: var(--light-pink);
  border-radius: var(--radius-10);
  z-index: -1;
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: var(--white);
  color: var(--chinese-violet);
  font-size: 22px;
  padding: 24px;
  border-radius: 50%;
  transition: var(--transition-1);
  animation: pulse 3s ease infinite;
}

.play-btn:is(:hover, :focus) { color: var(--old-rose); }

@keyframes pulse {
  0%,
  50% { box-shadow: 0 0 0 0 hsla(0, 0%, 100%, 0.5); }

  100% { box-shadow: 0 0 0 10px transparent; }
}


.benefits .section-text {
  text-align: center;
  margin-block: 8px 25px;
}

.benefits-card {
  padding: 25px;
  box-shadow: var(--shadow-2);
  border-radius: var(--radius-5);
  overflow: hidden;
  transition: var(--transition-2);
}

.benefits-card::before,
.benefits-card::after {
  bottom: 0;
  right: 0;
  clip-path: var(--polygon);
  transition: var(--transition-2);
}

.benefits-card::before {
  width: 80px;
  height: 80px;
  background-color: var(--old-rose_30);
  transform: translateY(60px);
}

.benefits-card::after {
  width: 70px;
  height: 70px;
  background-color: var(--chinese-violet_30);
  transform: translateY(65px);
}

.benefits-card:is(:hover, :focus-within) { transform: translateY(-10px); }

.benefits-card:is(:hover, :focus-within)::before,
.benefits-card:is(:hover, :focus-within)::after { transform: translateY(0); }

.benefits-card:is(:hover, :focus-within)::after { transition-delay: 0.1s; }

.benefits-card .card-icon {
  background-color: var(--old-rose);
  max-width: max-content;
  padding: 10px;
  box-shadow: var(--shadow-3);
  transition: var(--transition-1);
}

.benefits-card:is(:hover, :focus) .card-icon { box-shadow: none; }

.benefits-card .card-title { margin-block: 20px 15px; }

.benefits-card .btn-link { margin-block-start: 15px; }


.chapter-card {
  height: 100%;
  background-color: var(--white);
  padding: 25px;
  border-radius: var(--radius-5);
  box-shadow: var(--shadow-2);
  transition: var(--transition-2);
}

.chapter-card:is(:hover, :focus-within) { transform: translateY(-10px); }

.chapter-card .card-title { margin-block-end: 15px; }

.tab-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tab-card {
  position: relative;
  height: 60px;
  background-color: var(--seashell);
  border-radius: var(--radius-10);
  box-shadow: var(--shadow-3);
  display: grid;
  place-content: center;
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition-1);
}

.tab-card .w-100 {
  pointer-events: none;
  opacity: 0;
  transition: var(--transition-2);
}

.tab-card.active .w-100 { opacity: 1; }

.tab-card.active {
  height: 40vh;
  box-shadow: none;
}

.tab-text {
  font-size: var(--fs-4);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.tab-card.active .tab-text { display: none; }


.pricing-card {
  padding: 40px 50px;
  background-color: var(--white);
  text-align: center;
  transition: var(--transition-2);
}

.pricing-card:is(:hover, :focus-within),
.pricing-card.bundle { box-shadow: var(--shadow-4); }

.pricing-card:is(:hover, :focus-within) { transform: translateY(-10px); }

.pricing-card .price {
  font-family: var(--ff-philosopher);
  font-size: var(--fs-1);
  color: var(--charcoal);
  font-weight: var(--fw-700);
  margin-block-start: 10px;
}

.pricing-card-list { margin-block: 20px 40px; }

.pricing-card-list .card-item:not(:last-child) { border-block-end: 1px solid var(--ghost-white); }

.pricing-card .card-text { padding-block: 10px; }

.pricing-card .btn { margin-inline: auto; }

.author { background-color: var(--seashell); }

.author .container {
  display: grid;
  gap: 40px;
}

.author :is(.section-subtitle, .section-title) { text-align: left; }

.author-content {
  background-color: var(--white);
  padding: 30px;
}

.author-name {
  font-size: var(--fs-6);
  margin-block-end: 30px;
}

.author .section-text { font-size: unset; }

.section.achievement { background-color: var(--white); }

.achievement-card {
  background-color: var(--seashell);
  box-shadow: var(--shadow-4);
  overflow: hidden;
  transition: var(--transition-2);
}

.achievement-card:is(:hover, :focus-within) { transform: translateY(-10px); }

.achievement-card .card-content {
  position: relative;
  padding: 15px;
}

.achievement-card .abs-img {
  position: absolute;
  top: 0;
  right: -5px;
  opacity: 0.3;
}

.contact .wrapper {
  display: grid;
  gap: 25px;
}

.contact-form {
  background-color: var(--seashell);
  padding: 20px;
}

.input-field {
  background-color: var(--white);
  padding: 10px;
  margin-block-end: 15px;
  outline: none;
  border-block-end: 2px solid transparent;
}

.input-field:focus { border-color: var(--old-rose); }

textarea.input-field {
  resize: vertical;
  min-height: 120px;
  height: 120px;
  max-height: 200px;
}

.contact-form .btn { margin-inline: auto; }

.contact-card {
  background-color: var(--seashell);
  padding: 30px;
}

.contact-card .card-title {
  font-family: var(--ff-philosopher);
  text-transform: uppercase;
  font-weight: var(--fw-700);
}

.contact-card > li:not(:last-child) { margin-block-end: 30px; }

.contact-card .card-link {
  color: var(--chinese-violet);
  transition: var(--transition-1);
}

.contact-card .card-link:is(:hover, :focus) { color: var(--old-rose); }

.social-list-title {
  font-size: var(--fs-6);
  font-weight: var(--fw-700);
  margin-block-end: 15px;
}

.social-list {
  display: flex;
  gap: 10px;
}

.social-link {
  background-color: var(--old-rose);
  color: var(--white);
  font-size: 20px;
  padding: 5px;
  box-shadow: var(--shadow-3);
  transition: var(--transition-1);
}

.social-link:is(:hover, :focus) {
  background-color: var(--chinese-violet);
  box-shadow: none;
}


.footer {
  background-color: hsl(204.04deg 100% 92.86%);
  text-align: center;
}

.footer-top {
  padding-block: 50px;
  border-block-end: 1px solid var(--chinese-violet_30);
}

.footer .logo { margin-block-end: 15px; }

.footer-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  column-gap: 20px;
}

.footer-link {
  color: var(--charcoal);
  transition: var(--transition-1);
}

.footer-link:is(:hover, :focus) { color: var(--old-rose); }

.footer-bottom { padding-block: 20px; }

@media (min-width: 575px) {

  :root {


    --fs-2: 4.5rem;
    --fs-3: 3.5rem;
    --fs-5: 2.5rem;

  }




  .container,
  .header,
  .navbar {
    max-width: 540px;
    width: 100%;
    margin-inline: auto;
  }

  .section-text { --fs-7: 2rem; }



  .header { top: 30px; }

  .header.active { max-width: unset; }

  .navbar {
    left: 50%;
    transform: translateX(-50%);
  }

  .tab-card.active { height: 50vh; }


  .achievement-card { display: flex; }

  .achievement-card > * { width: 50%; }

  .achievement-card .card-content { padding-block: 30px; }

  .achievement-card .card-title { margin-block-end: 20px; }


  .social-list-title { --fs-6: 2.2rem; }

  .social-link {
    font-size: 25px;
    padding: 8px;
  }

}



@media (min-width: 768px) {

  :root {

    --fs-2: 4.8rem;

  }

  .container,
  .header,
  .navbar { max-width: 720px; }

  .grid-list { grid-template-columns: 1fr 1fr; }

  .hero {
    padding-block-start: calc(var(--section-padding) + 100px);
    text-align: left;
  }

  .hero .container {
    grid-template-columns: 1fr 0.8fr;
    align-items: center;
  }

  .hero .section-subtitle { text-align: left; }

  .benefits :is(.section-title, .section-text) { text-align: left; }

  .benefits-content { grid-column: 1 / 3; }

  :is(.chapters, .pricing) .grid-list li:last-child {
    grid-column: 1 / 3;
    max-width: calc(50% - 12.5px);
    width: 100%;
    margin-inline: auto;
  }

  .tab-card.active { height: 70vh; }


  .author .h2 { --fs-3: 4.2rem; }

  .achievement-card { flex-direction: column; }

  .achievement-card > * { width: 100%; }


  .contact .wrapper { grid-template-columns: 1fr 1fr; }

}



@media (min-width: 992px) {
  :root {

    --fs-2: 5.4rem;
    --fs-3: 4rem;

  }

  .container,
  .header,
  .navbar { max-width: 960px; }

  .grid-list { grid-template-columns: repeat(3, 1fr); }

  .header .container { padding-inline: 20px 30px; }

  .nav-toggle-btn { display: none; }

  .navbar,
  .navbar.active { all: unset; }

  .navbar-list {
    margin-block-end: 0;
    display: flex;
    gap: 30px;
  }


  .benefits .grid-list {
    grid-template-columns: repeat(4, 1fr);
    align-items: center;
  }

  .benefits-content { max-width: 80%; }

  :is(.chapters, .pricing) .grid-list li:last-child { all: unset; }

  .tab-list {
    flex-direction: row;
    gap: 20px;
  }

  .tab-text {
    text-orientation: upright;
    white-space: nowrap;
    writing-mode: vertical-lr;
  }

  .tab-card {
    height: 70vh;
    max-width: 60px;
  }

  .tab-card.active { max-width: 650px; }

  .author .container {
    grid-template-columns: 0.6fr 1fr;
    gap: 0;
  }

  .author-content {
    margin-block-start: 40px;
    margin-inline-start: -30px;
    padding-block-end: 70px;
  }

  .achievement .grid-list { grid-template-columns: 1fr 1fr; }

  .achievement-card { flex-direction: row; }

  .achievement-card > * { width: 50%; }

  .contact .wrapper { grid-template-columns: 1fr 0.5fr; }

  .contact-form { padding: 40px; }

}


@media (min-width: 1200px) {

  :root {

    --fs-2: 6rem;
    --fs-3: 4.5rem;
    --fs-4: 3rem;
    --fs-5: 3rem;

  }


  .container,
  .header,
   .navbar { max-width: 1340px; }


  .tab-card { max-width: 75px; }

  .tab-card.active { max-width: 750px; }


  .author-content { padding: 85px 60px 115px; }


  .footer-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .footer .logo { margin-block-end: 0; }

}