:root {
  --primary-900: hsl(256, 43%, 7%);
  --primary-800: hsl(240, 24%, 13%);
  --primary-700: hsl(243, 26%, 15%);
  --primary-600: hsl(252, 9%, 22%);
  --primary-500: hsl(259, 13%, 28%);
  --primary-400: hsl(254, 22%, 32%);

  --primary-300: hsl(251, 13%, 68%);
  --primary-200: hsl(240, 15%, 76%);
  --primary-100: hsl(240, 21%, 88%);

  --neutral-100: hsl(0, 0%, 100%);

  --accent-400: hsl(93, 60%, 69%);

  --text-1: var(--neutral-100);
  --text-2: var(--primary-100);
  --text-3: var(--primary-200);

  --surface-1: var(--primary-900);
  --surface-2: var(--primary-800);
  --surface-3: var(--primary-700);

  --border-1: var(--primary-500); /* top */
  --border-2: var(--primary-600); /* bottom */
}

*,
::before,
::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  color-scheme: dark;
  font-family: system-ui;
}

body {
  min-block-size: 100vb;
  background-size: cover;
  color: var(--text-3);
  background-color: var(--primary-900);
  background-image: linear-gradient(
      hsl(from var(--primary-700) h s l / 0.7) 0 0
    ),
    url("https://images.unsplash.com/photo-1535408190508-be4c21946da6?crop=entropy&cs=srgb&fm=jpg&ixid=M3wzMjM4NDZ8MHwxfHJhbmRvbXx8fHx8fHx8fDE3NDc3NTcyOTB8&ixlib=rb-4.1.0&q=85");
  background-position: top left;
  background-size: 300%;
  line-height: 1.5;
  padding: 10rem 2rem;
}

h1 {
  color: var(--text-1);
}

h1 {
  font-size: 1.325rem;
  font-weight: 500;
}

h2 {
  font-size: 1.125rem;
  font-weight: 400;
}

.text-accent {
  color: var(--accent-400);
}

.flex-between {
  display: flex;
  gap: 16px;
  justify-content: space-between;
}

.card {
  max-inline-size: 500px;
  margin-inline: auto;
  padding: 21px;
  position: relative;
  border-radius: 1rem;
  background-color: #14132450;
  backdrop-filter: blur(12px);

  display: grid;
  gap: 1lh;

  --border-1: #443e51;
  --border-2: #35333d;

  &::before {
    content: "";
    position: absolute;
    z-index: -1;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(var(--border-1), var(--border-2)) border-box;
    border: 1px solid transparent;
    mask: linear-gradient(#000, #000) border-box,
      linear-gradient(#000, #000) padding-box;
    mask-composite: subtract;
  }
}

.referral-code {
  display: flex;
  align-items: center;
  gap: 10px;
  background: hsl(from #0e0a1a h s l / 0.5);
  padding: 0.5ex 1ch;
  font-size: 1.125rem;
  border-radius: 12px;
  color: var(--text-1);
  letter-spacing: 3px;
}

.copy {
  cursor: pointer;
  background: 0;
  border: 0;
  padding: 0;
  height: 1.5lh;

  svg {
    fill: var(--text-1);
    width: 3ch;
    height: 3ch;
  }
}

.referred-users {
  text-align: end;
}

.user-count {
  font-size: 1.125rem;
  color: var(--text-1);
}

.rewards {
  text-align: center;
  color: var(--text-1);
  background: hsl(from var(--surface-1) h s l / 0.5);
  padding: 1ex 3ch;
  border-radius: 12px;

  h2 {
    color: var(--text-3);
  }
}