/* common */
body {
  margin: 0;
  font-family:Arial, Helvetica, sans-serif;
}
h1,
h2 {
  margin: 0;
  font-weight: normal;
  color: #22577a;
}
h1 {
  font-size: 24px;
}
h2 {
  font-size: 20px;
}
p {
  margin: 0;
  line-height: 1.6;
}
p + p {
  margin-top: 16px;
}
a {
  text-decoration: none;
  color: inherit;
}
img {
  vertical-align: bottom;
}
.btn {
  display: block;
  width: 160px;
  background: #329e00;
  color: #fff;
  text-align: center;
  padding: 8px 0;
  border-radius: 4px;
  font-weight: bold;
}
.container {
  width: calc(100% - 32px);
  margin: 0 auto;
  /* outline: 2px solid red; */
  max-width: 800px;
}
/* animate */
.animate {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity .3s, transform .3s;
}
.animate.slide-from-left {
  transform :translateX(-40px);
}
.animate.slide-from-right {
  transform :translateX(40px);
}
.animate.appear {
  opacity: 1;
  transform: none;
}
#to_top{
  position: fixed;
  bottom: 16px;
  right: 16px;
  opacity: 0;
  transition: opacity .3s;
}
#to_top.scrolled {
  opacity: 1;
}
#to_top i {
font-size: 32px;
color: #22577a;
}
/* header */
header {
  padding: 16px 0;
  position: fixed;
  top: 0;
  width: 100%;
  transition: background-color .3s, box-shadow .3s;
  z-index: 1;
}
header.scrolled {
  background-color: rgba(255,255,255,.95);
  box-shadow: 0 0 4px rgba(0,0,0,.3);
}
header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* hero */
.hero {
  background-color: #99e6ff;
  background-image: url(../img/bg.png);
  background-repeat: repeat-x;
  background-position: center bottom;
  padding-top: 128px;
  text-align: center;

}
.hero p {
  margin-top: 8px;
}
.hero .btn {
  margin: 64px auto 0;
}
.hero img {
  margin-top: 64px;
}


/* features */
.features {
  padding: 64px 0;
  overflow: hidden;
}
.features h1 {
  text-align: center;
  padding-bottom: 64px;
}
.features .pic {
  padding: 32px;
}
.features img {
  width: 100%;
}
.features h2 {
  padding-bottom: 16px;
}
.features section + section {
  margin-top: 40px;
}

/* voices */
.voices {
  background: #99e6ff;
  padding: 64px 0;

}
.voices h1 {
  text-align: center;
  padding-bottom: 64px;
}
.voices section {
  background: #fff;
  padding: 16px;
  border-radius: 16px;
}
.voices footer {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 16px;
}
.voices section + section {
  margin-top: 16px;
}

/* call-to-action */
.call-to-action {
  padding: 64px 0;
  background-color: #85d8f2;
  background-image: url(../img/bg.png);
  background-repeat: repeat-x;
  background-position: center bottom;
}
.call-to-action h1 {
  text-align: center;
  padding-bottom: 64px;
}
.call-to-action .btn {
  margin: 0 auto;
}

/* copyright */
.copyright {
  background:#323435;
  padding: 64px 0;
  text-align: center;
}
.copyright small {
  font-size: 16px;
  color: #eee;
}

/* large screen */
@media (min-width : 600px) {
  .hero .container {
    display: flex;
    align-items: center;
  }
  .hero .desc,
  .hero.pic {
    width: 50%;
  }
  .hero img {
    width: calc(100% - 32px);
    height: auto;
    margin-top: 0;
  }

  .features section {
    display: flex;
  }
  .features section:nth-child(odd) {
    flex-direction: row-reverse;
  }

  .voices .container {
    display: flex;
    gap: 16px;
  }
  .voices section + section {
    margin-top: 0;
  }
  .voices section {
    width: calc((100% - 32px) / 3);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }
  .animate.delay {
    transition-delay: .3s;
  }
  .animate.delay-more {
    transition-delay: .6s;
  }
}