:root {
  --clr-dark-blue: #001a68;
  --clr-blue: #0078d4;
  --clr-light-grey: #adbcce;
  --clr-white: #fff;
  --clr-black: #000;
  --clr-light-grey: #bfbfbf;

  --fw-regular: 400;
  --fw-semi-bold: 500;
  --fw-bold: 600;

  --fz-300: 1.5rem;
  --fz-400: 1.75rem;
  --fz-500: 3rem;
  --fz-600: 8rem;
}
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Remove default margin */
body,
h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

/* Remove list styles on ul, ol elements with a list role, which suggests default styling will be removed */
ul[role="list"],
ol[role="list"] {
  list-style: none;
}

/* Set core root defaults */
html:focus-within {
  scroll-behavior: smooth;
}

/* Set core body defaults */
body {
  min-height: 100vh;
  text-rendering: optimizeSpeed;
  line-height: 1.5;
}

/* A elements that don't have a class get default styles */
a:not([class]) {
  text-decoration-skip-ink: auto;
}

/* Make images easier to work with */
img,
picture {
  max-width: 100%;
  display: block;
}

/* Inherit fonts for inputs and buttons */
input,
button,
textarea,
select {
  font: inherit;
}

/* Remove all animations, transitions and smooth scroll for people that prefer not to see them */
@media (prefers-reduced-motion: reduce) {
  html:focus-within {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@font-face {
  font-family: "Segoe UI";
  src: url("./fonts/SegoeUI-VF.ttf") format("ttf");
}

.container {
  max-width: 1440px;
  margin: 0 auto;
}

.borderline {
  margin: 3rem 0;
  height: 1px;
  background-color: var(--clr-light-grey);
}

a {
  text-decoration: none;
}

.button {
  display: flex;
  margin: 0 auto;
  align-items: center;
  justify-content: center;
  line-height: 1;
  min-width: 10rem;
  padding: 0.8rem 1rem;
  border-radius: 30px;
  color: var(--clr-white);
  background-color: var(--clr-blue);
  border: none;
}

.button-none {
  border: none;
  background-color: transparent;
}

.button:hover {
  cursor: pointer;
}

.arrow {
  display: inline-block;
  padding: 8px;
  border: solid black;
  border-width: 0 3px 3px 0;
  background-color: transparent;
}

.right {
  transform: rotate(-45deg);
  -webkit-transform: rotate(-45deg);
}

.left {
  transform: rotate(135deg);
  -webkit-transform: rotate(135deg);
}

.down {
  transform: rotate(45deg);
  -webkit-transform: rotate(45deg);
}

.header {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-image: url(./img/bg-hero.jpg);
  background-repeat: no-repeat;
  background-size: cover;
}

.header__upper {
  display: flex;
  padding: 2rem 0;
  justify-content: space-between;
}

.header__logo {
  object-fit: contain;
}

.header__lower {
  display: flex;
  gap: 1rem;
  flex-direction: column;
  text-align: center;
}

.header__lower_title {
  line-height: 1;
  font-size: var(--fz-600);
  letter-spacing: 2px;
  color: var(--clr-white);
}

.header__lower_title span {
  color: var(--clr-dark-blue);
}

.header__lower_subtitle {
  color: var(--clr-dark-blue);
  font-size: var(--fz-500);
}

.notebooks {
  display: flex;
  padding: 2rem;
  justify-content: center;
  color: var(--clr-white);
}

.notebooks-cards {
  display: flex;
  gap: 1rem;
}

.notebooks__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1;
  flex-grow: 1;
  gap: 1rem;
}

.notebooks__card_text {
  display: flex;
  padding: 1rem;
  flex-direction: column;
  border-radius: 1rem;

  flex-grow: 1;
  background-color: var(--clr-light-grey);
}

.notebooks__img_wrapper {
  padding: 1rem;
  border-radius: 1rem;
  background-color: var(--clr-white);
}

.notebooks__price {
  margin-top: auto;
  padding: 2rem;
  border-radius: 1rem;
  color: black;
  background-color: var(--clr-white);
}

.notebooks__price h4 {
  color: var(--clr-secondary-100);
  text-decoration: line-through;
}

.notebooks__price h2 {
  font-size: 2rem;
  color: var(--clr-secondary-200);
}
.notebooks__price span {
  color: var(--clr-red);
}

.usage {
  padding: 3rem 0;
  background-image: url("./img/bg-2.png");
  background-repeat: no-repeat;
  background-size: cover;
  text-align: center;
}

.usage__title {
  font-size: var(--fz-500);
}

.usage__subtitle {
  margin: 0 auto;
  width: 50%;
}

.usage__cards {
  display: flex;
  padding: 1rem;
  gap: 1rem;
}
.usage__card {
  display: flex;
  flex: 1;
  flex-direction: column;
  text-align: left;
}

.manual {
  padding: 3rem 0;
  background-image: url("./img/bg-3.png");
  background-repeat: no-repeat;
  background-size: cover;
}

.manual__title {
  font-size: var(--fz-500);
}

.manual__subtitle {
  font-size: var(--fz--300);
}

.manual__items {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
}
.manual__desc {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  line-height: 1.2;
}

.icons {
  padding: 3rem;
  text-align: center;
}

.icons__title {
  width: 50%;
  margin: 0 auto;
  font-size: var(--fz-500);
  line-height: 1.1;
}

.icons__subtitle {
  width: 70%;
  margin: 1rem auto;
  line-height: 1.1;
}

.glide {
  padding: 3rem;
}

.glide__track {
  width: 80%;
  margin: 0 auto;
}

.glide__img {
  width: 81px;
  height: 81px;
}

.glide button {
  box-shadow: none;
}

.glide-2 {
  position: relative;
  padding: 3rem;
}

.tryout {
  padding: 3rem 0;
  background-image: url("./img/bg-4.png");
  background-repeat: no-repeat;
  background-size: cover;
}
.tryout__title {
  font-size: var(--fz-500);
}

.recycle {
  padding: 3rem;
  text-align: center;
}

.recycle__text {
  display: flex;
  margin: 0 auto;
  width: 70%;
  flex-direction: column;
  gap: 1rem;
}
.recycle__title {
  font-size: var(--fz-500);
}
.footer {
  padding: 3rem;
  background-color: var(--clr-dark-blue);
}
.footer__icons {
  display: flex;
  justify-content: space-between;
}

.footer__logo {
  filter: brightness(0) invert(1);
}

.footer__icons_wrapper {
  display: flex;
  gap: 1rem;
}

.footer__text {
  font-size: var(--fz-300);
  color: white;
}

@media only screen and (max-width: 768px) {
  .container {
    width: 100%;
    padding: 1rem;
  }

  .header__upper {
    padding: 1rem 0;
    align-items: center;
    gap: 1rem;
  }

  .header__logo {
    width: 30%;
  }

  .header__lower {
    margin-top: 3rem;
  }
  .header__lower_title {
    font-size: var(--fz-500);
  }

  .header__lower_subtitle {
    font-size: var(--fz-400);
  }

  .header__lower_img {
    width: 100%;
    object-fit: contain;
  }

  .notebooks {
    padding: 0;
  }
  .notebooks-cards {
    flex-direction: column;
    gap: 0;
  }

  .usage {
    padding: 0;
  }

  .usage__title {
    font-size: var(--fz-400);
  }

  .usage__subtitle {
    margin: 0;
    width: 100%;
  }

  .usage__cards {
    flex-direction: column;
  }

  .manual {
    padding: 0;
  }

  .manual__items {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .manual__title {
    font-size: var(--fz-400);
  }

  .icons {
    padding: 1rem 0;
  }
  .icons__title {
    width: 100%;
    margin: 0;
    font-size: var(--fz-400);
  }

  .icons__subtitle {
    width: 100%;
  }

  .glide {
    padding: 1rem 0;
  }

  .glide-2 {
    padding: 1rem 0;
  }

  .glide__track {
    width: 66%;
  }

  .glide .glide__arrow--left {
    left: 0;
  }

  .glide .glide__arrow--right {
    right: 0;
  }

  .glide-2 .glide__arrow--left {
    left: 0;
  }

  .glide-2 .glide__arrow--right {
    right: 0;
  }
  .tryout {
    padding: 3rem 0;
  }

  .tryout__title {
    font-size: var(--fz-400);
  }

  .recycle {
    padding: 0;
  }
  .recycle__text {
    width: 100%;
  }
  .recycle__title {
    font-size: var(--fz-400);
  }

  .footer {
    padding: 1rem 0;
  }

  .footer__icons_wrapper {
    margin: 0 auto;
  }

  .footer__icons {
    padding: 1rem;
    gap: 1rem;
  }

  .footer__logo {
    width: 50%;
    margin: 0 auto;
  }

  .footer__text {
    font-size: 1rem;
  }
}

.fz-300 {
  font-size: var(--fz-300);
}

.fz-400 {
  font-size: var(--fz-400);
}

.fz-500 {
  font-size: var(--fz-500);
}

.fw-600 {
  font-weight: var(--fw-bold);
}

.white {
  color: var(--clr-white);
}