@import url("https://fonts.googleapis.com/css?family=Open+Sans|Roboto:400,700&display=swap");

:root {
  --clr-blueVispa: #166fc1;
  --clr-white: #fff;
  --clr-black: #000;
  --lightgray: #f2f2f2;
  --clr-grey-10: hsl(210, 36%, 96%);
  --clr-grey-5: hsl(210, 22%, 49%);
  --clr-grey-1: hsl(209, 61%, 16%);
  --clr-red: #ff0000;
  --clr-blueDark: hsla(212, 85%, 21%, 1);
  --light-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  --clr-laptopDark: #5b5c62;
  --clr-laptopLight: #aaa;
  --ff-primary: "Roboto", sans-serif;
  --ff-secondary: "Open Sans", sans-serif;
  --transition: all 0.3s linear;
  --spacing: 0.2rem;
  --radius: 0.5rem;
  --hero-height: 750px;
}

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

body {
  background: var(--clr-white);
  font-family: var(--ff-secondary);
  line-height: 1.5;
  font-size: 0.875rem;
  max-width: 100%;
  overflow-x: hidden;
  padding-top: 5rem;
}

a {
  text-decoration: none;
  color: var(--clr-blueVispa);
}

ul {
  list-style-type: none;
}

.material-icons {
  font-family: 'Material Icons';
  font-weight: normal;
  font-style: normal;
  font-size: 24px;
  /* Preferred icon size */
  display: inline-block;
  width: 1em;
  height: 1em;
  line-height: 1;
  text-transform: none;
  letter-spacing: normal;
  word-wrap: normal;
  white-space: nowrap;
  direction: ltr;
  /* Support for all WebKit browsers. */
  -webkit-font-smoothing: antialiased;
  /* Support for Safari and Chrome. */
  text-rendering: optimizeLegibility;
  /* Support for Firefox. */
  -moz-osx-font-smoothing: grayscale;
  /* Support for IE. */
  font-feature-settings: 'liga';
}

.material-icons.md-36 {
  font-size: 36px;
}

.material-icons.md-40 {
  font-size: 40px;
}

.material-icons.md-48 {
  font-size: 48px;
}

.material-icons.md-55 {
  font-size: 55px;
}

.section {
  padding: 5rem 0;
}

.section-center {
  width: 90vw;
  margin: 0 auto;
  max-width: 1170px;
}

.grey-bg {
  background-color: var(--clr-grey-10);
}

h1,
h2,
h3,
h4 {
  letter-spacing: var(--spacing);
  text-transform: capitalize;
  line-height: 1.25;
  margin-bottom: 0.75rem;
  font-family: var(--ff-primary);
}

h1 {
  font-size: 3rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.25rem;
}

h4 {
  font-size: 0.875rem;
}

p {
  margin-bottom: 1.25rem;
}

@media screen and (min-width: 800px) {
  h1 {
    font-size: 4rem;
  }

  h2 {
    font-size: 2.5rem;
  }

  h3 {
    font-size: 1.75rem;
  }

  h4 {
    font-size: 1rem;
  }

  body {
    font-size: 1rem;
  }

  h1,
  h2,
  h3,
  h4 {
    line-height: 1;
  }
}

.underline {
  width: 6rem;
  height: 0.25rem;
  margin: 0 auto 1.25rem auto;
  background: var(--clr-blueVispa);
}

.title {
  text-transform: uppercase;
  text-align: center;
}

.vispaBlue {
  color: var(--clr-blueVispa);
}

.vispa-logo {
  /* width: 100%; */
  height: 3rem;
  display: block;
}

blockquote {
  padding: 10.5px 21px;
  margin: 0 0 21px;
  border-left: 5px solid #e6e6e6;
}

/* end of gloabal styles */
/* navbar */
.nav {
  background: var(--clr-white);
  color: var(--clr-blueVispa);
  height: 5rem;
  padding: 1rem;
  display: grid;
  -ms-align-items: center;
  align-items: center;
}

.navbar-fixed {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  box-shadow: var(--light-shadow);
}

.nav-center {
  width: 100%;
  margin: 0 auto;
  max-width: 1350px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
}

.nav-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  -moz-column-gap: 1rem;
  column-gap: 1rem;
}

.nav-links {
  display: none;
}

.sidebar-btn {
  background: transparent;
  border-color: transparent;
  cursor: pointer;
  color: var(--clr-blueVispa);
  outline: none;
  justify-self: end;
}

.nav-login-btn {
  border-radius: 0.6rem;
  padding: 0.5rem 2rem;
  border: 2px solid var(--clr-blueVispa);
  background-color: var(--clr-blueVispa);
  letter-spacing: var(--spacing);
  margin-left: 1rem;
  color: var(--clr-white);
}

.mobile-login {
  justify-self: end;
  padding: 0.5rem 1rem;
}

.nav-login-btn:hover {
  border-color: var(--clr-grey-1);
}

@media screen and (min-width: 920px) {
  .sidebar-btn {
    display: none;
  }

  .mobile-login {
    display: none;
  }

  .nav-center {
    display: grid;
    align-items: center;
    grid-template-columns: auto 1fr auto;
  }

  .nav-links {
    display: grid;
    grid-template-columns: repeat(5, auto);
    justify-items: center;
    -moz-column-gap: 2rem;
    column-gap: 2rem;
    justify-self: end;
  }

  .nav-links a {
    color: var(--clr-grey-1);
    text-transform: capitalize;
    padding: 0.75rem;
    letter-spacing: var(--spacing);
    border-radius: 0.6rem;
  }

  .nav-links a:hover {
    background-color: var(--clr-grey-10);
  }

  .nav-links .nav-login-btn {
    border-radius: 0.6rem;
    padding: 0.5rem 2rem;
    border: 2px solid var(--clr-blueVispa);
    background-color: var(--clr-blueVispa);
    letter-spacing: var(--spacing);
    color: var(--clr-white);
  }

  .nav-links .nav-login-btn:hover {
    border-color: var(--clr-grey-1);
    background-color: var(--clr-blueVispa);
  }
}

/* end of navbar */
/* sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  height: 100%;
  background-color: var(--clr-grey-10);
  display: grid;
  place-items: center;
  transition: var(--transition);
  transform: translateX(-100%);
}

.show-sidebar {
  transform: translateX(0);
}

.sidebar-close {
  position: fixed;
  top: 1rem;
  right: 1rem;
  color: var(--clr-red);
  background: transparent;
  border: transparent;
  outline: none;
}

.sidebar-links {
  width: 400px;
  margin-left: 1rem;
}

.sidebar-links a {
  font-size: 2rem;
  display: inline-block;
  margin-bottom: 1.5rem;
  color: var(--clr-grey-5);
  transition: var(--transition);
}

.sidebar-links a:hover {
  color: var(--clr-blueVispa);
  margin-left: 0.5rem;
}

/* end of sidebar */
/* hero */
.hero {
  height: calc(var(--hero-height) - 5rem);
}

.background {
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  z-index: 0;
}

.hero:before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: var(--hero-height);
  background: var(--clr-blueVispa);
  transform: skew(-35deg);
  transform-origin: top;
  z-index: -1;
}

.hero-center {
  display: grid;
  grid-row-gap: 5rem;
  grid-column-gap: 4rem;
  max-width: 1550px;
  justify-items: center;
}

.hero-info {
  padding: 1rem;
  margin-top: 4rem;
  background-color: var(--clr-white);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
  border-radius: var(--radius);
  max-width: 600px;
  /* align-self: center; */
}

.hero-info h2 {
  margin-bottom: 1rem;
  line-height: 1;
}

.hero-info .main-btn {
  float: right;
}

.main-btn {
  border-radius: var(--radius);
  padding: 0.5rem;
  border: 2px solid var(--clr-blueVispa);
  background-color: var(--clr-blueVispa);
  color: var(--clr-white);
}

.main-btn:hover {
  border-color: var(--clr-grey-1);
}

.hero-video {
  width: 300px;
  height: 210px;
  -o-object-fit: cover;
  object-fit: cover;
  border-radius: var(--radius) var(--radius) 0 0;
  border: 0.7rem solid var(--clr-laptopDark);
  position: relative;
}

.hero-video-container {
  position: relative;
  margin: 0 auto 0 auto;
}

.hero-video:focus {
  outline: none;
}

.hero-video-container:before {
  content: "";
  position: absolute;
  width: 110%;
  height: 10px;
  background: var(--clr-laptopLight);
  bottom: -4px;
  left: -5%;
}

.hero-video-container:after {
  content: "";
  position: absolute;
  width: 110%;
  height: 10px;
  background: var(--clr-laptopDark);
  border-bottom-right-radius: 45px 8px;
  border-bottom-left-radius: 45px 8px;
  bottom: -14px;
  left: -5%;
}

.camera {
  position: absolute;
  color: red;
  left: 50%;
  top: -36px;
  font-size: 4rem;
}

@media screen and (min-width: 450px) {
  .hero-video {
    width: 350px;
    height: 240px;
  }
}

@media screen and (min-width: 600px) {
  .hero-video {
    width: 400px;
    height: 270px;
  }
}

@media screen and (min-width: 700px) {
  .hero-video {
    width: 555px;
    height: 356.25px;
  }

  .hero-center {
    grid-row-gap: 2rem;
  }
}

@media screen and (min-width: 850px) {
  .hero:before {
    top: 0;
    right: 20%;
    background: var(--clr-blueVispa);
    transform: skew(-35deg);
  }
}

@media screen and (min-width: 1250px) {
  .hero-center {
    grid-template-columns: auto 1fr;
    height: calc(var(--hero-height) - 50px - 5rem);
  }

  .hero-info {
    margin-top: 8.5rem;
    align-self: start;
  }

  .hero-video-container {
    align-self: end;
    justify-self: center
  }

  .hero:before {
    top: 0;
    right: 40%;
    background: var(--clr-blueVispa);
    transform: skew(-40deg);
  }
}

@media screen and (min-width: 1300px) {
  .hero-video {
    width: 600px;
    height: 385px;
  }
}

@media screen and (min-width: 1450px) {
  .hero-video {
    width: 650px;
    height: 413.75px;
  }
}

@media screen and (min-width: 1550px) {
  .hero-video {
    width: 700px;
    height: 442.5px;
  }

  .hero:before {
    top: 0;
    right: 55%;
    background: var(--clr-blueVispa);
    transform: skew(-40deg);
  }
}

@media screen and (min-width: 1700px) {
  .hero-video {
    width: 800px;
    height: 510px;
  }
}

@media screen and (min-width: 2000px) {
  .hero:after {
    content: "";
    position: absolute;
    top: 0;
    right: -1vw;
    width: 10%;
    height: var(--hero-height);
    background: var(--clr-blueVispa);
    z-index: -1;
  }
}

/* end of hero */
/* services */
/* *************************** services *************************** */
.services {
  text-align: center;
  position: relative;
}

.service-background {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--clr-grey-10);
  z-index: -100;
}

.services-title {
  margin-bottom: 4rem;
}

.services-title p {
  max-width: 550px;
  margin: 0 auto;
}

.service {
  max-width: 450px;
  margin: 0 auto 3rem auto;
}

.service h3 {
  color: var(--clr-blueVispa);
}

.service-title {
  height: 120px;
  margin-bottom: 1rem;
}

.icon-container {
  position: relative;
}

.service-title img {
  margin-bottom: 1rem;
}

.icon-1 {
  position: absolute;
  top: -53px;
  left: -30px;
  z-index: -1;
}

.icon-2 {
  background: var(--clr-grey-10);
  margin: 0rem auto 2rem auto;
  z-index: 2;
}

.icon-3 {
  background: var(--clr-grey-10);
  position: absolute;
  top: -10px;
  left: 35px;
  z-index: 3;
}

.icon-server-1, .icon-server-2, .icon-server-3 {
  border: 1px solid black;
  border-radius: var(--radius);
  background: var(--clr-grey-10);
}

.icon-server-1 {
  position: absolute;
  top: -53px;
  left: -35px;
  z-index: -1;
}

.icon-server-2 {
  margin: 0rem auto 2rem auto;
  z-index: 3;
}

.icon-server-3 {
  position: absolute;
  top: -15px;
  left: 35px;
  /* z-index: 3; */
}

@media screen and (min-width: 730px) {
  .services-center {
    display: grid;
    grid-template-columns: 1fr 1fr;
    justify-content: center;
    align-items: center;
    grid-column-gap: 1rem;
  }

  .service {
    align-self: start;
    display: grid;
    place-items: center;
  }
}

@media screen and (min-width: 800px) {
  .icon-server-1 {
    top: -40px;
  }

  .icon-server-1 {
    top: -51px;
  }

  .icon-server-3 {
    top: -13px;
  }
}

@media screen and (min-width: 1100px) {
  .services-center {
    grid-template-columns: 1fr 1fr 1fr;
    grid-column-gap: 2rem;
  }
}

/* end of services */
/* *************************** extensions *************************** */
.extensions {
  text-align: center;
}

.extension-img {
  border-radius: 0.5rem 0.5rem 0 0;
  width: 100%;
  display: block;
}

.extension-card {
  position: relative;
  border: 0.3rem solid var(--clr-blueVispa);
  border-radius: 1rem;
  padding: 0.2rem;
  margin: 2rem 0;
  transition: var(--transition);
  -webkit-box-shadow: 5px 5px 2px 0px rgba(0, 0, 0, 0.75);
  -moz-box-shadow: 5px 5px 2px 0px rgba(0, 0, 0, 0.75);
  box-shadow: 5px 5px 2px 0px rgba(0, 0, 0, 0.75);
}

.extension-card:hover {
  -webkit-box-shadow: 10px 10px 5px 0px rgba(0, 0, 0, 0.75);
  -moz-box-shadow: 10px 10px 5px 0px rgba(0, 0, 0, 0.75);
  box-shadow: 10px 10px 5px 0px rgba(0, 0, 0, 0.75);
}

.extension-info {
  background: var(--clr-blueVispa);
  border-radius: 0 0 0.5rem 0.5rem;
  font-size: 1.3rem;
  letter-spacing: var(--mainSpacing);
  color: var(--clr-white);
  text-transform: capitalize;
  padding: 4rem 0 1rem 0;
}

.extension-img-container {
  position: relative;
}

.extension-icon {
  position: absolute;
  width: 60px;
  height: 60px;
  bottom: 0;
  left: 50%;
  font-size: 3rem;
  background: var(--clr-white);
  padding: 0.25rem 0;
  text-align: center;
  border-radius: 50%;
  border: 0.2rem solid var(--clr-blueVispa);
  color: var(--clr-blueVispa);
  transform: translate(-50%, 50%);
  /* -webkit-box-shadow: 10px 10px 5px 0px rgba(0, 0, 0, 0.75);
  -moz-box-shadow: 10px 10px 5px 0px rgba(0, 0, 0, 0.75); */
  box-shadow: 8px 8px 5px 0px rgba(0, 0, 0, 0.75);
  display: grid;
  place-items: center;
}

@media screen and (min-width: 850px) {
  .extensions-center {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-column-gap: 1.5rem;
  }
}

@media screen and (min-width: 1100px) {
  .extensions-center {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-column-gap: 1rem;
  }
}

.extension-link {
  color: var(--clr-black);
  font-size: 2rem;
  font-weight: 700;
  transition: var(--transition);
}

.extension-arrow {
  transition: var(--transition);
  transform: translate(0, 20%);
}

.extension-link:hover .extension-arrow {
  transform: translate(4px, 20%);
  color: var(--clr-blueVispa);
}

/* *************************** end of extensions *************************** */
/* research and teaching */
.research-info {
  max-width: 600px;
  margin: 2.5rem auto 3.5rem auto;
  text-align: center;
}

.research {
  background: var(--clr-grey-10);
  text-align: center;
}

/* end of research and teaching */
/* footer */
.footer {
  margin: 1rem 0;
}

.footer-center {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 1rem;
}

.footer-logo {
  justify-self: end;
}

.footer-info {
  justify-self: start;
  align-self: end;
}

/* end of footer */
/* +++++++++++++++++ user guide +++++++++++++++++*/
.guide-center {
  display: grid;
  grid-template-columns: 1fr;
  grid-gap: 3rem;
}

.guide h2 {
  margin-bottom: 2rem;
}

.guide-info {
  text-align: justify;
  max-width: 600px;
  justify-self: center;
}

.guide-img-container {
  position: relative;
  background: var(--clr-blueVispa);
  margin: 0 auto;
  max-width: 390px;
  box-shadow: var(--light-shadow);
}

.guide-img {
  position: relative;
  width: 100%;
  display: block;
  transition: var(--transition);
  cursor: pointer;
}

.search-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  color: var(--clr-white);
  font-size: 3.5rem;
  transform: translate(-50%, -50%);
  cursor: pointer;
  transition: var(--transition);
  opacity: 0;
}

.guide-img-container:hover .guide-img {
  opacity: 0.5;
}

.guide-img-container:hover .search-icon {
  opacity: 1;
}

@media screen and (min-width: 1050px) {
  .guide-center {
    grid-template-columns: 1fr 1fr;
  }

  .guide-info, .guide-img-container {
    align-self: center;
  }

  .guide-center>.guide-info {
    grid-column: 1;
  }

  .guide-center>.guide-img-container {
    grid-column: 2;
    /* grid-row: 1; */
  }

  .guide-center.reverse>.guide-info {
    grid-column: 2;
  }

  .guide-center.reverse>.guide-img-container {
    grid-column: 1;
    grid-row: 1;
  }
}

/* modal */
.modal {
  display: none;
  position: fixed;
  z-index: 999;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.7);
}

.modal-show {
  display: grid;
  place-items: center;
}

.modal-content {
  position: relative;
  margin: auto;
  width: 80%;
  max-width: 700px;
  border: 0.5rem solid var(--clr-blueVispa);
}

.modal-caption {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  text-align: center;
  color: #ccc;
  padding: 10px 0;
}

/* Add Animation - Zoom in the Modal */
.modal-content, .modal-caption {
  animation-name: zoom;
  animation-duration: 0.6s;
}

@keyframes zoom {
  from {
    transform: scale(0)
  }

  to {
    transform: scale(1)
  }
}

.modal-close {
  position: absolute;
  top: -60px;
  right: -12%;
  font-size: 3rem;
  color: var(--clr-white);
  cursor: pointer;
  text-transform: none;
  display: inline-block;
}

.modal-close:hover,
.modal-close:focus {
  text-decoration: none;
  cursor: pointer;
}

/* 100% Image Width on Smaller Screens */
/* @media only screen and (max-width: 700px) {
  .modal-content {
    width: 100%;
  }
} */
/* Hide the slides by default */
.mySlide {
  display: none;
}

.not-visible {
  display: none;
}

/* Next & previous buttons */
.modal-prev,
.modal-next {
  display: none;
  cursor: pointer;
  position: absolute;
  top: 50%;
  left: -15px;
  z-index: 3;
  transform: translate(-50%, -50%);
  color: var(--clr-white);
  transition: 0.6s ease;
  user-select: none;
  -webkit-user-select: none;
}

.modal-button-show {
  display: block;
}

/* Position the "next button" to the right */
.modal-next {
  left: calc(100% + 15px);
}

.modal-img-nr {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 40px;
  background: var(--clr-white);
  border-top: 1px solid var(--clr-blueVispa);
  border-left: 1px solid var(--clr-blueVispa);
  z-index: 3;
  text-align: center;
}

/* +++++++++++++++++ end of user guide +++++++++++++++++*/
.bigTitle {
  color: var(--clr-blueVispa);
  margin-top: 2rem;
}

.publication {
  margin-top: 2.5rem;
}

.about {
  height: calc(100vh - 7rem - 55px);
}