* {
  box-sizing: border-box;
}

:root {
  --font-family: IRANSansX;
  --text-color: #171717;
  --button-bg-color: #f8f9fa;
  --color-whatsapp: #25d366;
  --color-telegram: #0088cc;
  --color-instagram: pink;
  --color-facebook: #3b5998;
  --color-twitter: #1da1f2;
  --color-linkedin: #0077b5;
  --color-youtube: #ff0000;
  --color-github: #24292e;
  --color-skype: #00aff0;
}

html,
body,
div {
  margin: 0;
  padding: 0;
}

html {
  font-size: 62.5%;
  height: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 1.6rem;
  width: 100%;
  min-height: 100%;
  padding: 1rem 0;
}
a {
  text-decoration: none;
}
.app {
  width: 100%;
  min-height: 100%;
  display: flex;
  align-items: center;
  flex-direction: column;
  text-align: center;
  margin: auto;
  padding: 4rem 1rem;
  background: white;
}
.site-title {
  font-size: 2rem;
}

.logo {
  width: 100px;
  height: 100px;
  transition: all 0.3s ease-in-out;
}
.logo:hover {
  filter: drop-shadow(-1px 3px 4px #000);
}
.logo-icons {
  width: 50px;
  height: 50px;
}
.social-btn {
  width: 90%;
}
.btn {
  text-decoration: none;
  color: white;
  width: 100%;
  height: 48px;
  padding: 10px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}
.btn-title {
  padding: 0 1rem;
}

.social-icons {
  display: flex;
  justify-content: space-evenly;
  align-items: center;
  flex-wrap: wrap;
  max-width: 250px;
}

.social-icon img {
  width: 50px;
  height: 50px;
  background-size: contain;
  background-position: center;
  margin: 1rem;
  transition: all 0.3s ease-in-out;
}

.whatsapp-shadow:hover {
  filter: drop-shadow(-2px 5px 4px var(--color-whatsapp));
}
.telegram-shadow:hover {
  filter: drop-shadow(-2px 5px 4px var(--color-telegram));
}
.instagram-shadow:hover {
  filter: drop-shadow(-2px 5px 4px var(--color-instagram));
}
.facebook-shadow:hover {
  filter: drop-shadow(-2px 5px 4px var(--color-facebook));
}
.twitter-shadow:hover {
  filter: drop-shadow(-2px 5px 4px var(--color-twitter));
}
.linkedin-shadow:hover {
  filter: drop-shadow(-2px 5px 4px var(--color-linkedin));
}
.youtube-shadow:hover {
  filter: drop-shadow(-2px 5px 4px var(--color-youtube));
}
.github-shadow:hover {
  filter: drop-shadow(-2px 5px 4px var(--color-github));
}

.official-site {
  background-color: var(--button-bg-color);
  color: var(--text-color);
  width: 230px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem;
  border-radius: 40px;
  margin: 0 auto 2rem auto;
  transition: all 0.3s ease-in-out;
}
.official-site:hover {
  box-shadow: 0 0.5rem 2rem 0.5rem rgb(0 0 0 / 10%);
}
.official-site-text {
  flex-grow: 1;
}