@import url("https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&family=Lora:ital,wght@0,400..700;1,400..700&family=Fira+Code:wght@300..700&display=swap");

:root {
  --background-light: rgb(255, 255, 255);
  --text-light: rgb(24, 24, 27);
  --secondary-light: rgb(113, 113, 122);
  --border-light: rgb(229, 231, 235);
  --card-background-light: rgb(252, 252, 252);

  --background-dark: rgb(18, 18, 18);
  --text-dark: rgb(244, 244, 245);
  --secondary-dark: rgb(161, 161, 170);
  --border-dark: rgb(64, 64, 64);
  --card-background-dark: rgb(24, 24, 27);

  --font-sans: "Inter", sans-serif;
  --font-serif: "Lora", serif;
  --font-mono: "Fira Code", monospace;
}

* {
  font-family: var(--font-sans);
}

body {
  color: var(--text-light);
  background-color: var(--background-light);

  &.dark {
    color: var(--text-dark);
    background-color: var(--background-dark);
  }

  transition: color 0.3s ease-in, background-color 0.3s ease-in;
}

.container {
  width: 100%;
  max-width: 48rem;
  padding: 2rem;
  margin: 2rem auto;
}

#scroll-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  color: var(--text-light);
  border: 1px solid var(--border-light);
  background-color: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity 0.3s ease-in, background-color 0.3s ease-in, color 0.3s ease-in;
  z-index: 1000;

  .dark & {
    background-color: rgba(0, 0, 0, 0.1);
    color: var(--text-dark);
    border-color: var(--border-dark);

    &:hover {
      background-color: var(--border-dark);
    }
  }

  &:hover {
    background-color: var(--border-light);
  }

  &.visible {
    opacity: 1;
  }
}

#back-button {
  position: fixed;
  top: 20px;
  left: 20px;
  border: 1px solid var(--border-light);
  background-color: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border-radius: 0.375rem;
  padding: 0.5rem 1rem;
  transition: background-color 0.3s ease-in, color 0.3s ease-in;
  z-index: 1000;
  display: inline-flex;
  font-size: 0.875rem;
  align-items: center;
  color: var(--secondary-light);

  &:hover {
    background-color: var(--border-light);
    color: var(--text-light);
  }

  .dark & {
    background-color: rgba(0, 0, 0, 0.1);
    color: var(--secondary-dark);
    border-color: var(--border-dark);

    &:hover {
      background-color: var(--border-dark);
      color: var(--text-dark);
    }
  }
}