/*
 * SMACSS-based architecture
 * No reset or normalize for simplicity
 * Ref: http://smacss.com/ | https://css-tricks.com/reboot-resets-reasoning/
 */

/* ---- Base Rules ---- */
body {
  background: linear-gradient(0deg, rgba(136,203,171,1) 0%, rgba(0,13,60,1) 100%);
  margin: 0;
  font-family: 'Merriweather', serif;
  color: #fff;
}

/* ---- Typography ---- */
h1 {
  font-family: 'Fira Sans', sans-serif;
  font-size: 3em;
  margin: 2em 1rem;
}

/* Larger font on wider screens */
@media only screen and (min-width: 35em) {
  h1 {
    font-size: 7em;
    margin: 2em 4rem 1em;
  }
}

h2 {
  border-bottom: 1px solid #cc1;
  font-family: 'Oxygen', Sans-Serif;
  font-size: 3em;
  color: #fff;
}

p {
  line-height: 1.6em;
  color: #eee;
}

/* ---- Layout ---- */
main {
  margin: 10vh 1em 10vh;
}

.main-hero {
  min-height: 40vh;
  padding-top: 3em;
}

section {
  position: relative;
  min-height: 80vh;
}

/* ---- Module Rules ---- */
/* Navigation layout */
.navbar__menu ul {
  padding-left: 0;
  margin: 0;
  text-align: right;
}

.navbar__menu li {
  display: inline-block;
}

.navbar__menu .menu__link {
  display: block;
  padding: 1em;
  font-weight: bold;
  text-decoration: none;
  color: #000;
}

.navbar__menu .menu__link:hover {
  background: #333;
  color: #fff;
  transition: ease 0.3s all;
}

/* Sticky top header */
.page__header {
  background: #fff;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 5;
}

/* Footer styling */
.page__footer {
  background: #000;
  padding: 3em;
  color: #fff;
}

.page__footer p {
  color: #fff;
}

/* ---- Theme Rules ---- */
/* Section content container */
.landing__container {
  padding: 1em;
  text-align: left;
}

/* Active nav link highlight */
.menu__link.active {
  background-color: yellow;
  font-weight: bold;
}

/* Wider padding and max width for larger screens */
@media only screen and (min-width: 35em) {
  .landing__container {
    max-width: 50em;
    padding: 4em;
  }
}

/* Flip text for even sections */
section:nth-of-type(even) .landing__container {
  margin-right: 0;
  margin-left: auto;
  text-align: right;
}

/* ---- Decorative Background Circles ---- */
/* Background circles for odd/even/3n/3n+1 sections */
section:nth-of-type(odd) .landing__container::before,
section:nth-of-type(even) .landing__container::before,
section:nth-of-type(3n) .landing__container::after,
section:nth-of-type(3n + 1) .landing__container::after {
  content: '';
  position: absolute;
  z-index: -5;
  border-radius: 50%;
  opacity: 0;
  transition: ease 0.5s all;
}

/* Custom positions/sizes/colors for each pattern */
section:nth-of-type(odd) .landing__container::before {
  background: rgba(255, 255, 255, 0.187);
  width: 20vh;
  height: 20vh;
}

section:nth-of-type(even) .landing__container::before {
  background: linear-gradient(0deg, rgba(255,255,255,.1), rgba(255,255,255,.2));
  top: 3em;
  right: 3em;
  width: 10vh;
  height: 10vh;
}

section:nth-of-type(3n) .landing__container::after {
  background: linear-gradient(0deg, rgba(255,255,255,.1), rgba(255,255,255,.2));
  right: 0;
  bottom: 0;
  width: 10vh;
  height: 10vh;
}

section:nth-of-type(3n + 1) .landing__container::after {
  background: linear-gradient(0deg, rgba(255,255,255,.1), rgba(255,255,255,.2));
  right: 20vw;
  bottom: -5em;
  width: 15vh;
  height: 15vh;
}

/* ---- Section Active State ---- */
/* Applied by JS for highlighting visible section */
section.your-active-class {
  background: linear-gradient(0deg, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0));
}

section.your-active-class .landing__container::before {
  opacity: 1;
  animation: rotate 4s linear infinite forwards;
}

section.your-active-class .landing__container::after {
  opacity: 1;
  animation: rotate 5s linear infinite forwards reverse;
}

/* Keyframes for spinning animation */
@keyframes rotate {
  from {
    transform: rotate(0deg) translate(-1em) rotate(0deg);
  }
  to {
    transform: rotate(360deg) translate(-1em) rotate(-360deg);
  }
}

/* ---- Mobile Styles ---- */
@media only screen and (max-width: 768px) {
  .navbar__menu ul {
    text-align: center;
  }

  .navbar__menu li {
    display: block;
    margin-bottom: 10px;
  }

  .page__header {
    position: absolute;
    width: 100%;
    text-align: center;
  }

  .landing__container {
    padding: 2em;
    text-align: center;
  }

  .scroll-top-btn {
    bottom: 15px;
    right: 15px;
    font-size: 16px;
    padding: 8px 12px;
  }
}