* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  font-size: 62.5%;
  --text-color: #000;
  --bg-url: url(./image/bg-mobile-light.jpg);
  --stroke-color: rgba(0, 0, 0, 0.5);
  --surface-color: rgba(0, 0, 0, 0.05);
  --highlight-color: rgba(0, 0, 0, 0.1);
  --surface-color-houer: rgba(0, 0, 0, 0.02);
  --switch-bd-url: url(./image/sun.svg);
}

.dark {
  --text-color: #fff;
  --bg-url: url(./image/bg-mobile-dark.jpg);
  --stroke-color: rgba(255, 255, 255, 0.5);
  --surface-color: rgba(255, 255, 255, 0.1);
  --highlight-color: rgba(255, 255, 255, 0.2);
  --surface-color-houer: rgba(255, 255, 255, 0.05);
  --switch-bd-url: url(./image/moon-stars.svg);
}

body * {
  font-family: "Inter", sans-serif;
  color: var(--text-color);
}

body {
  /*image repeat position/size*/
  background: var(--bg-url) no-repeat top center/cover;
  height: 100vh;
}

.container {
  width: 100%;
  max-width: 588px;
  /* height: 71.2rem; */
  margin: 5.6rem auto 0;
  padding: 0 2.4rem;
}

#profile {
  text-align: center;
  padding: 2.4rem;
}

#profile img {
  width: 11.2rem;
  border-radius: 50%;
  border: 1.5px solid var(--stroke-color);
  box-shadow: 0px 4px 4px rgba(0, 0, 0, 0.25);
}

#profile p {
  font-weight: 500;
  font-size: 1.6rem;
  line-height: 2.4rem;
  margin-top: 8px;
}

#switch {
  position: relative;
  width: 6.4rem;

  margin: 4px auto;
}

#switch button {
  width: 3.2rem;
  height: 3.2rem;
  border: 0;
  border-radius: 50%;
  background: #fff var(--switch-bd-url) no-repeat center;

  position: absolute;
  z-index: 1;
  top: 50%;
  left: 0;
  transform: translateY(-50%);

  animation: slide-back 0.2s;;
}

.dark #switch button {
  animation: slide-in 0.2s forwards;
}

#switch button:hover {
  outline: 8px solid var(--highlight-color);
}

#switch span {
  display: block;
  width: 6.4rem;
  height: 2.4rem;
  background: var(--surface-color);
  border: 1px solid var(--stroke-color);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border-radius: 9999px;
}

ul {
  list-style: none;

  display: flex;
  flex-direction: column;
  gap: 1.6rem;

  padding: 2.4rem 0;
}

ul li a {
  font-size: 1.6rem;
  font-weight: 500;
  text-decoration: none;

  display: flex;
  align-items: center;
  justify-content: center;

  padding: 1.6rem 2.4rem;

  background: var(--surface-color);
  border: 1px solid var(--stroke-color);
  border-radius: 8px;

  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);

  transition: background 0.2s;
}

ul li a:hover {
  background: var(--surface-color-houer);
  border: 1.5px solid var(--text-color);
}

#social-links {
  display: flex;
  justify-content: center;

  padding: 2.4rem 0;
  font-size: 2.4rem;
}

#social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.6rem;
  border-radius: 50%;

  transition: background 0.2s;
}

#social-links a:hover {
  background: var(--highlight-color);
}

footer {
  font-size: 1.4rem;
  padding: 2.4rem 0;
  text-align: center;
}

@media (max-width: 320px) {
  footer {
    font-size: 1.2rem;
  }

  #social-links {
    font-size: 1.6rem;
  }
}

@media (min-width: 600px) {
  :root {
    --bg-url: url(./image/bg-desktop-light.jpg);
  }

  .dark {
    --bg-url: url(./image/bg-desktop-dark.jpg);
  }
}

@keyframes slide-in {
  from {
    left: 0;
  }
  to {
    left: 50%;
  }
}

@keyframes slide-back {
  from {
    left: 50%;
  }
  to {
    left: 0;
  }
}