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

:root {
  --primary-font: "Noto Sans", sans-serif;
  --secondary-font: "M PLUS 1p", sans-serif;
  --audiowide-font: "Audiowide", sans-serif;
}

:root {
  --primary: #1a93ba;
  --primary-dark: #0b5c9e;
  --primary-light: #1ac2bb;

  --black: #102a43;
  --white: #ffffff;

  --text: #334155;
  --background: #f8fbfc;
  --border: #e2edf2;
}

body {
  font-family: var(--primary-font);
  background-color: var(--background);
  color: var(--text);
}

.font-audiowide {
  font-family: var(--audiowide-font);
  text-transform: uppercase;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--secondary-font);
}

.scroll-top-btn {
  position: fixed;
  right: 30px;
  bottom: 30px;
  width: 50px;
  height: 50px;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  z-index: 9999;

  background: var(--primary);
  color: var(--white);
  font-size: 20px;
  font-weight: 700;

  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);

  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);

  transition: all 0.3s ease;
}

.scroll-top-btn.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  transform: translateY(-4px);
}