* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  list-style: none;
}

:root {
  --color-primary: #191d2b;
  --color-secondary: #27ae60;
  --color-white: #ffffff;
  --color-black: #000000;
  --color-grey0: #f8f8f8f8;
  --color-grey1: #dbe1e8;
  --color-grey2: #b2becd;
  --color-grey3: #6c7983;
  --color-grey4: #454e56;
  --color-grey5: #2a2e35;
  --color-grey6: #12181b;

  --br-sm-2: 14px;

  --transition: all 0.6s ease-out;

  --box-shadow-1: 0 3px 15px rgba(0, 0, 0, 0.2);
}

.light-mode {
  --color-primary: #f8f8f8f8;
  --color-secondary: #db941a;
  --color-white: #000000;
  --color-black: #ffffff;
  --color-grey0: #191d2b;
  --color-grey1: #2a2e35;
  --color-grey2: #b2becd;
  --color-grey3: #6c7983;
  --color-grey4: #454e56;
  --color-grey5: #dbe1e8;
  --color-grey6: #12181b;
}

body {
  background-color: var(--color-primary);
  font-family: 'Poppins', sans-serif;
  font-size: 1.1rem;
  color: var(--color-white);
}

a {
  display: inline-block;
  text-decoration: none;
  color: inherit;
  font-family: inherit;
}

header {
  height: 100vh;
  color: var(--color-white);
  overflow: hidden;
}

/** Animations  */

.rotate-scale-up {
  -webkit-animation: rotate-scale-up 0.65s linear both;
  animation: rotate-scale-up 0.65s linear both;
}
@-webkit-keyframes rotate-scale-up {
  0% {
    -webkit-transform: scale(1) rotateZ(0);
    transform: scale(1) rotateZ(0);
  }
  50% {
    -webkit-transform: scale(2) rotateZ(180deg);
    transform: scale(2) rotateZ(180deg);
  }
  100% {
    -webkit-transform: scale(1) rotateZ(360deg);
    transform: scale(1) rotateZ(360deg);
  }
}
@keyframes rotate-scale-up {
  0% {
    -webkit-transform: scale(1) rotateZ(0);
    transform: scale(1) rotateZ(0);
  }
  50% {
    -webkit-transform: scale(2) rotateZ(180deg);
    transform: scale(2) rotateZ(180deg);
  }
  100% {
    -webkit-transform: scale(1) rotateZ(360deg);
    transform: scale(1) rotateZ(360deg);
  }
}

.theme-btn {
  top: 5%;
  right: 3%;
  width: 55px;
  height: 55px;
  display: flex;
  padding: 1rem;
  cursor: pointer;
  position: fixed;
  margin: 0.7rem 0;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  background-color: var(--color-grey4);
  box-shadow: var(--box-shadow-1);
  transition: all 0.6s ease-in-out 0.2s;
}

.theme-btn.active {
  transition: var(--transition);
  -webkit-animation: rotate-center 0.6s ease-in-out both;
  animation: rotate-center 0.6s ease-in-out both;
}

.theme-btn i {
  font-size: 1.5rem;
  color: var(--color-grey2);
  pointer-events: none;
}

/** controls button styles  */

.controls {
  position: fixed !important;
  z-index: 10;
  top: 50%;
  right: 3%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transform: translateY(-50%);
}

.controls .control {
  padding: 1rem;
  cursor: pointer;
  background-color: var(--color-grey4);
  width: 55px;
  height: 55px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0.7rem 0;
  box-shadow: var(--box-shadow-1);
}

.controls .control i {
  font-size: 1.2rem;
  color: var(--color-grey2);
  pointer-events: none;
}

.controls .active-btn {
  background-color: var(--color-secondary);
  transition: var(--transition);
  -webkit-animation: rotate-center 0.6s ease-in-out both;
  animation: rotate-center 0.6s ease-in-out both;
}

.controls .active-btn i {
  color: var(--color-white);
}

@-webkit-keyframes rotate-center {
  0% {
    -webkit-transform: rotate(0);
    transform: rotate(0);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}
@keyframes rotate-center {
  0% {
    -webkit-transform: rotate(0);
    transform: rotate(0);
  }
  100% {
    -webkit-transform: rotate(360deg);
    transform: rotate(360deg);
  }
}

/** Titles of all sections  */
.main-title {
  text-align: center;
}

.main-title h2 {
  position: relative;
  text-transform: uppercase;
  font-size: 4rem;
  font-weight: 700;
  margin: 0;
  padding: 0;
}

.main-title h2 span {
  color: var(--color-secondary);
}

.main-title h2 .bg-text {
  position: absolute;

  top: 110%;
  left: 50%;
  color: var(--color-grey5);
  transition: var(--transition);
  z-index: -1;
  transform: translate(-50%, -50%);
  font-weight: 800;
  font-size: 6.3rem;
}