* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Lato", sans-serif;
}

:root {
  --black-color: #272a31;
  --ornage-color: #ec5242;
  --gray-color: #d3d3d3;
  --white-color: #fff;
}

html {
  font-size: 16px;
}

a {
  text-decoration: none;
}

body {
  background-image: url(../images/mobile-bg.jpg);
  background-repeat: no-repeat;
  background-size: cover;
  height: 85vh;
}

/* mobile menu */

.program-wrapper .whole-program {
  display: none;
}

.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  display: flex;
  padding: 1.75rem;
  height: 100%;
  width: 100%;
  background-color: #3a3a3a;
  flex-direction: column;
  opacity: 0.9;
}

.mobile-menu .close-menu {
  align-self: flex-end;
}

.mobile-menu .mobile-menu-content {
  padding-left: 1.75rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 1.25rem;
}

.mobile-menu a {
  text-decoration: none;
  color: var(--gray-color);
  font-size: 2rem;
}

.mobile-menu a:hover {
  color: var(--ornage-color);
}

header {
  padding: 1.2rem 0 0 1.5rem;
}

.welcome-wrapper {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 1.2rem;
  gap: 2rem;
}

.welcome-header {
  margin-top: 3rem;
}

.welcome-header p {
  color: var(--ornage-color);
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.welcome-header h1 {
  font-weight: 900;
  font-size: 2.4rem;
  background-image: url(../images/welcome-bg.jpg);
  background-size: cover;
  background-repeat: no-repeat;
  -webkit-background-clip: text;
  color: transparent;
}

.welcome-wrapper .description {
  font-size: 1rem;
  font-weight: 400;
  text-align: left;
  padding: 2%;
  border: 3px solid var(--white-color);
  background-color: #f7f7f7;
}

.welcome-wrapper .date-venue {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0 0 3.8rem 0;
}

.date-venue .schedule {
  font-weight: 900;
  font-size: 1.2rem;
  color: #555656;
}

.date-venue .address {
  font-weight: 700;
  font-size: 0.8rem;
  color: #767676;
}

/********* main program *************/
.program-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 5%;
  gap: 0.8rem;
  background: url(../images/pattern_bg.png);
  color: var(--white-color);
  background-color: #272b31;
}

.program-wrapper .program-title {
  margin-top: 2rem;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 2rem;
}

.program-wrapper .title-underline {
  width: 3rem;
  border: 1px solid var(--ornage-color);
  margin-bottom: 2rem;
}

.program-wrapper .program-details {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.program-details .program-cards {
  display: flex;
  justify-content: flex-start;
  background-color: #f2f2f21a;
  padding: 0.8rem;
  gap: 0.9rem;
  align-items: center;
  text-align: left;
}

.program-cards .card-images {
  width: 3.5rem;
  height: 3rem;
}

.program-cards .card-title {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--ornage-color);
}

.program-wrapper .join-link {
  color: var(--white-color);
  background-color: var(--ornage-color);
  padding: 2rem 1.25rem;
  font-size: 1rem;
  font-weight: 700;
  margin: 2rem 0;
}

/********** featured speakers ************/
.speakers-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 5%;
  margin-top: 2rem;
}

.speakers-wrapper .speaker-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #555656;
}

.speakers-wrapper .title-underline {
  width: 3rem;
  border: 1px solid var(--ornage-color);
  margin: 1.5rem 0 2rem 0;
}

.speakers-wrapper .speaker-container {
  display: grid;
  grid-template-columns: 1fr 2fr;
  grid-template-rows: 1fr;
  column-gap: 1rem;
  margin-top: 1.875rem;
}

.speaker-intro .speaker-name {
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 0.4rem;
}

.speaker-intro .speaker-photo {
  margin: -0.3rem 0 1rem 0;
}

.speaker-intro {
  flex-direction: column;
  gap: 1rem;
}

.speaker-intro .speaker-profession {
  font-weight: 400;
  font-size: 0.9rem;
  color: var(--ornage-color);
  font-style: italic;
}

.speaker-intro .title-underline {
  width: 1.5rem;
  border: 1px solid #d9d9d9;
  margin: 0.56rem 0;
}

.speaker-intro .speaker-bio {
  font-weight: 400;
  font-size: 0.8rem;
  color: #555656;
}

.speakers-wrapper .see-more,
.speakers-wrapper .see-less {
  color: #838383;
  width: 100%;
  border: 1px solid #dad9d9;
  border-radius: 0.4rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1rem;
  justify-content: center;
  font-size: 1.2rem;
  margin-top: 1rem;
}

.speakers > div:nth-child(n + 4) {
  display: none;
}

/* ******** partner section********* */

.partner-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 5%;
  gap: 0.8rem;
  background-color: #3e3e3e;
  color: var(--white-color);
}

.partner-wrapper .partner-title {
  margin-top: 2rem;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 2rem;
}

.partner-wrapper .title-underline {
  width: 3rem;
  border: 1px solid var(--ornage-color);
  margin-bottom: 2rem;
}

.partner-logo img {
  display: inline-flex;
  flex-wrap: wrap;
  width: 30%;
  max-width: 10rem;
}

/******** footer ********/

footer {
  display: flex;
  justify-content: space-evenly;
  align-items: center;
  padding: 1.6rem 2rem;
}

footer .footer-logo {
  width: 100px;
  height: 80px;
}

footer .copyright {
  color: #838383;
  font-weight: 700;
  font-size: 0.8rem;
}

.hidden {
  display: none;
}

.navbar-menu .logo,
.social-link-top,
.navbar-menu {
  display: none;
}

/* desktop version */
@media screen and (min-width: 768px) {
  .mobile-menu-icon {
    display: none;
  }

  .navbar-menu .logo,
  .social-link-top,
  .navbar-menu {
    display: block;
  }

  header {
    padding: 1rem 0 0;
  }

  body {
    margin-top: -1.2rem;
    background-image: url(../images/desktop_bg.png);
    background-size: cover;
    background-position: 50% 50%;
    height: 113vh;
    width: 100%;
  }

  /* partner section */

  .partner-logo img {
    width: 40%;
    padding: 0 1.5rem;
  }

  .navbar-menu .logo img {
    display: block;
    width: 100%;
    height: 5rem;
  }

  .social-link-top {
    background-color: #3e3e3e;
  }

  .social-link-top ul {
    display: flex;
    justify-content: flex-end;
    list-style: none;
    padding: 0.5rem 0;
    gap: 1rem;
    margin-right: 12rem;
  }

  .menu li a {
    color: var(--black-color);
  }

  .social-link-top ul li a {
    color: var(--white-color);
  }

  .menu li a:hover,
  .menu li a:focus {
    color: var(--ornage-color);
  }

  .social-link-top ul li a:hover {
    color: var(--ornage-color);
  }

  .social-link-top ul li img:hover {
    transform: scale(1.1);
  }

  /* menu */

  .navbar-menu {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background-color: var(--white-color);
    width: 100%;
    height: 5rem;
  }

  .navbar-menu .menu {
    list-style: none;
    display: flex;
    gap: 2rem;
  }

  .menu li#campaign a {
    color: var(--ornage-color);
    border: 4px solid var(--ornage-color);
    padding: 0.7rem;
  }

  .menu li#campaign a:hover {
    background-color: var(--ornage-color);
    color: var(--white-color);
    padding: 0.7rem;
  }

  /* welcome section */

  .welcome-wrapper {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 2.5rem 15rem;
  }

  /* main program section */

  .program-wrapper .program-details {
    flex-direction: row;
    gap: 0.3rem;
  }

  .program-details .program-cards {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
  }

  .program-wrapper .join-link {
    display: none;
  }

  .program-wrapper .whole-program {
    color: var(--white-color);
    font-weight: 400;
    font-size: 1.25rem;
    text-decoration: underline;
    margin: 3rem 0 2rem 0;
  }

  /* featured speakers section */

  .speakers-wrapper {
    margin-top: -1rem;
  }

  .speakers-wrapper .speakers {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr;
    column-gap: 1rem;
    padding: 0 1.5rem;
  }

  .speakers > div {
    display: flex !important;
  }

  .speakers-wrapper .speakers .see-more,
  .speakers-wrapper .speakers .see-less {
    display: none !important;
  }

  footer {
    padding: 1.6rem 0;
  }
}