/* variables */

:root {
  --white: #ffffff;
  --gray: #4a5568;
  --orange: #fd8369;
  --skyblue: #74d5de;
}


/* reset */

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

html {
  scroll-behavior: smooth;
}


body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  ;
  font-weight: 400;
  font-size: 1rem;
  color: var(--gray);
  line-height: 1.5;
  background-color: var(--white);
}

header,
main,
article,
section,
footer,
nav {
  display: block;
  width: 100%;
}


/* main image */

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


/* header */

header {
  display: block;
  text-align: center;
  padding: 1rem;
}

@media screen and (max-width:768px) {
  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
}

a,
span {
  display: inline-block;
  text-decoration: none;
  color: inherit;
}

/* logo letters */

.b,
.s {
  display: inline-block;
  width: 2rem;
  height: 2rem;
  line-height: 1.6;
  font-size: 1.2rem;
  color: var(--white);
  border-radius: 99px;
  text-decoration: none;
}

.b {
  background-color: var(--orange);
}

.s {
  background-color: var(--skyblue);
  transform: translateX(-10px);
}


/* heading */

.heading {
  font-size: 2rem;
  font-weight: 400;
  letter-spacing: 0.2rem;
  text-transform: capitalize;
  color: var(--orange);
}


@media screen and (min-width:768px) {
  .heading {
    font-size: 2.4rem;

  }
}

.lead {
  font-size: 1.2rem;
  line-height: 1.7;
  word-spacing: 0.04rem;
}


/* social links */

ul.list {
  display: flex;
  justify-content: center;
  list-style: none;
}

.list li {
  padding: 0.8rem;
  color: var(--skyblue);
  transition: color, transform 0.2s linear;
}

.list li:hover {
  transform: translateY(-8px);
  color: var(--orange);
}


/* button */

.button {
  display: inline-block;
  color: var(--white);
  background-color: var(--skyblue);
  padding: 0.3rem 0.5rem;
  border-radius: 4px;
  letter-spacing: 0.05rem;
  cursor: pointer;
}

.button:hover {
  background-color: var(--orange);
  transition: background-color 0.4s linear;
}


/* grid */

.row {
  display: flex;
  flex-flow: column nowrap;
  flex-shrink: 0;
}

[class^='col-'] {
  overflow: hidden;
  width: 100%;
  padding-left: 1rem;
  padding-right: 1rem;
}

@media screen and (min-width:768px) {

  .row {
    flex-direction: row;
    justify-content: center;
    align-items: center;
  }

  .col-md-33 {
    flex-basis: 33%;
  }

  .col-md-50 {
    flex-basis: 50%;
  }
}

/* utitily */


.mb-1 {
  margin-bottom: 1rem;
}

.p-1 {
  padding: 1rem;
}

.mb-2 {
  margin-bottom: 2rem;
}


@media screen and (min-width:768px) {

  .vh-md-60 {
    height: 60vh;
  }

  .d-md-none {
    display: none;
  }
}


/*  animations */


@-webkit-keyframes fade-in-left {
  0% {
    -webkit-transform: translateX(-50px);
    transform: translateX(-50px);
    opacity: 0;
  }

  100% {
    -webkit-transform: translateX(0);
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes fade-in-left {
  0% {
    -webkit-transform: translateX(-50px);
    transform: translateX(-50px);
    opacity: 0;
  }

  100% {
    -webkit-transform: translateX(0);
    transform: translateX(0);
    opacity: 1;
  }
}

.fade-in-left {
  -webkit-animation: fade-in-left 2s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
  animation: fade-in-left 2s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
}


@-webkit-keyframes fade-in-right {
  0% {
    -webkit-transform: translateX(50px);
    transform: translateX(50px);
    opacity: 0;
  }

  100% {
    -webkit-transform: translateX(0);
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes fade-in-right {
  0% {
    -webkit-transform: translateX(50px);
    transform: translateX(50px);
    opacity: 0;
  }

  100% {
    -webkit-transform: translateX(0);
    transform: translateX(0);
    opacity: 1;
  }
}

.fade-in-right {
  -webkit-animation: fade-in-right 2s cubic-bezier(0.470, 0.000, 0.745, 0.715) both;
  animation: fade-in-right 2s cubic-bezier(0.470, 0.000, 0.745, 0.715) both;
}


@-webkit-keyframes fade-in-top {
  0% {
    -webkit-transform: translateY(-50px);
    transform: translateY(-50px);
    opacity: 0;
  }

  100% {
    -webkit-transform: translateY(0);
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes fade-in-top {
  0% {
    -webkit-transform: translateY(-50px);
    transform: translateY(-50px);
    opacity: 0;
  }

  100% {
    -webkit-transform: translateY(0);
    transform: translateY(0);
    opacity: 1;
  }
}

.fade-in-top {
  -webkit-animation: fade-in-top 2s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
  animation: fade-in-top 2s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
}


@-webkit-keyframes fade-in-bottom {
  0% {
    -webkit-transform: translateY(50px);
    transform: translateY(50px);
    opacity: 0;
  }

  100% {
    -webkit-transform: translateY(0);
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes fade-in-bottom {
  0% {
    -webkit-transform: translateY(50px);
    transform: translateY(50px);
    opacity: 0;
  }

  100% {
    -webkit-transform: translateY(0);
    transform: translateY(0);
    opacity: 1;
  }
}

.fade-in-bottom {
  -webkit-animation: fade-in-bottom 2s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
  animation: fade-in-bottom 2s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
}


@-webkit-keyframes scale-in-center {
  0% {
    -webkit-transform: scale(0);
    transform: scale(0);
    opacity: 1;
  }

  100% {
    -webkit-transform: scale(1);
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes scale-in-center {
  0% {
    -webkit-transform: scale(0);
    transform: scale(0);
    opacity: 1;
  }

  100% {
    -webkit-transform: scale(1);
    transform: scale(1);
    opacity: 1;
  }
}

.scale-in-center {
  -webkit-animation: scale-in-center 2s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
  animation: scale-in-center 2s cubic-bezier(0.250, 0.460, 0.450, 0.940) both;
}


/* different animation on the basis of screen width */

.animation-one {
  -webkit-animation: fade-in-left 2s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
  animation: fade-in-left 2s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
}

.animation-two {
  -webkit-animation: fade-in-right 2s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
  animation: fade-in-right 2s cubic-bezier(0.390, 0.575, 0.565, 1.000) both;
}


@media screen and (min-width:768px) {
  .animation-one {
    animation-name: fade-in-top;
  }

  .animation-two {
    animation-name: fade-in-bottom;
  }

}