Aurora source

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<!doctype html>
<html lang="en">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<meta name="color-scheme" content="light dark">
<title>Aurora</title>
<!--css-->
<main class="stage" aria-label="Soft bands of violet light turning slowly across a dark sky, drawn by one blurred conic gradient on a registered angle"><div class="aurora"></div></main>

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@import "lib/stage";
@import "lib/aurora";

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@property --c-ink {
  syntax: "<color>";
  inherits: true;
  initial-value: #14121f;
}

@property --c-paper {
  syntax: "<color>";
  inherits: true;
  initial-value: #f4f1ff;
}

@property --c-accent {
  syntax: "<color>";
  inherits: true;
  initial-value: #6d4aff;
}

@property --c-car-wall {
  syntax: "<color>";
  inherits: true;
  initial-value: #e9e6dc;
}

@property --c-seat {
  syntax: "<color>";
  inherits: true;
  initial-value: #c9c4b4;
}

@property --c-line {
  syntax: "<color>";
  inherits: true;
  initial-value: #ff9500;
}

@property --c-tunnel {
  syntax: "<color>";
  inherits: true;
  initial-value: #05050a;
}

@property --c-lamp {
  syntax: "<color>";
  inherits: true;
  initial-value: #ffe9b0;
}

@property --c-platform {
  syntax: "<color>";
  inherits: true;
  initial-value: #dfe9ff;
}

@property --a-spin {
  syntax: "<angle>";
  inherits: false;
  initial-value: 0deg;
}

@layer tokens {
  :root {
    color-scheme: light dark;
    --c-ink: light-dark(#14121f, #f4f1ff);
    --c-paper: light-dark(#f4f1ff, #0b0a14);
    --c-accent: light-dark(#6d4aff, #9d85ff);
    --c-car-wall: light-dark(#e9e6dc, #1a1826);
    --c-seat: light-dark(#c9c4b4, #2a2638);
    --c-line: light-dark(#ff9500, #ff9f1a);
    --c-tunnel: #05050a;
    --c-lamp: #ffe9b0;
    --c-platform: light-dark(#dfe9ff, #9fb4e8);
    --t-fast: .15s;
    --t-base: .4s;
    --t-slow: 1.2s;
    --t-drift: 24s;
    --t-rush: 1.6s;
    --t-swing: 3.6s;
    --ease-out: cubic-bezier(.22, 1, .36, 1);
    --ease-spring: linear(0, .22 2.1%, .73 6.5%, 1.04 10.7%, 1.09 13%, 1.02 20%, .99 27%, 1);
  }
}

@layer reset {
  *, :before, :after {
    box-sizing: border-box;
    margin: 0;
  }

  html {
    block-size: 100%;
  }
}

@layer base {
  body {
    background: var(--c-paper);
    min-block-size: 100dvh;
    color: var(--c-ink);
    font: 1rem / 1.5 system-ui, sans-serif;
    overflow: clip;
  }

  .stage {
    contain: strict;
    position: fixed;
    inset: 0;
    overflow: clip;
  }
}

@layer scene {
  .aurora {
    background: conic-gradient(from var(--a-spin) at 50% 50%,
        var(--c-accent), transparent 25%, var(--c-accent) 50%, transparent 75%, var(--c-accent));
    filter: blur(80px);
    opacity: .6;
    animation: aurora-spin var(--t-drift) linear infinite;
    position: absolute;
    inset: -25%;
  }

  @keyframes aurora-spin {
    to {
      --a-spin: 360deg;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    .aurora {
      animation: none;
    }
  }
}

@layer utilities;