erase background

2026-06-01 22:47:24 +02:00
parent d8b622860c
commit 99f255fc29
11 changed files with 562 additions and 21 deletions
--- a/static/css/ascii.css
+++ b/static/css/ascii.css
@@ -0,0 +1,111 @@
+/* ==========================================================================
+   tui-pages website - animated ASCII art layer (chafa-rendered)
+   Loaded AFTER site.css. Provides:
+     - .tp-ascii-rain   full-bleed body background, slow drifting pattern
+                        sourced from static/img/og-image-bg.svg
+   All animations respect prefers-reduced-motion.
+   ========================================================================== */
+
+/* Body-wide ASCII art background ---------------------------------------- */
+/* Fixed full-bleed layer behind all content. Renders a chafa output of the
+   og-image-bg.svg (black background + "tui-pages" wordmark + headline +
+   subtitle), drawn as ASCII glyphs in a single full-width tile. Two copies
+   of the tile are stacked vertically and the whole track drifts slowly
+   upward, looping seamlessly when the top copy exits the viewport.
+
+   The hero is a static <img src="static/img/terminal-default.svg"> as
+   designed - this file does NOT touch the hero.
+
+   Regenerate the source tile with `make ascii` (uses chafa on
+   static/img/og-image-bg.svg). The chafa output is in static/ascii/rain.txt
+   and is 240 columns wide. */
+
+.tp-ascii-rain {
+  position: fixed;
+  inset: 0;
+  z-index: 0;                  /* sit above the page background, below the content */
+  pointer-events: none;
+  opacity: 0.14;
+  overflow: hidden;
+  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
+  font-size: clamp(6px, 0.9vw, 9px);
+  line-height: 1.05;
+  color: #f4a26b;            /* warm rust-orange tint, picks up the brand */
+  white-space: pre;
+  text-shadow: 0 0 6px rgba(183, 65, 14, 0.25);   /* faint phosphor glow */
+  will-change: transform;
+}
+
+/* The track holds two byte-identical copies of rain.txt stacked vertically.
+   translateY(0 -> -50%) is a perfect seamless loop. */
+.tp-ascii-rain-track {
+  display: block;
+  width: 100%;
+  margin: 0;
+  padding: 0;
+  animation: tp-ascii-drift 90s linear infinite;
+  will-change: transform;
+}
+
+.tp-ascii-rain-cell {
+  display: block;
+  white-space: pre;          /* preserve the chafa line breaks */
+}
+
+/* CRT scanlines overlay - a thin moving line every 2px. Faint so it doesn't
+   fight the page content. */
+.tp-ascii-rain::after {
+  content: "";
+  position: absolute;
+  inset: 0;
+  background: repeating-linear-gradient(
+    to bottom,
+    transparent 0,
+    transparent 2px,
+    rgba(0, 0, 0, 0.18) 2px,
+    rgba(0, 0, 0, 0.18) 3px
+  );
+  pointer-events: none;
+  animation: tp-ascii-scanline 8s linear infinite;
+}
+
+@keyframes tp-ascii-drift {
+  0%   { transform: translateY(0); }
+  100% { transform: translateY(-50%); }
+}
+
+@keyframes tp-ascii-scanline {
+  0%   { background-position: 0 0; }
+  100% { background-position: 0 6px; }
+}
+
+/* The hero text is high-contrast on its own (zinc-50 / accent), and the
+   body ASCII rain is at 14% opacity. No overlay needed — the rain shows
+   through everywhere. */
+
+/* Light theme: invert to dark text on light, dimmer, no glow. */
+:root[data-theme="light"] .tp-ascii-rain {
+  opacity: 0.10;
+  color: #1f1f23;
+  text-shadow: none;
+  mix-blend-mode: multiply;
+}
+
+:root[data-theme="light"] .tp-ascii-rain::after {
+  background: repeating-linear-gradient(
+    to bottom,
+    transparent 0,
+    transparent 2px,
+    rgba(255, 255, 255, 0.12) 2px,
+    rgba(255, 255, 255, 0.12) 3px
+  );
+}
+
+/* Reduced motion: pause the drift, keep the static background. */
+@media (prefers-reduced-motion: reduce) {
+  .tp-ascii-rain-track,
+  .tp-ascii-rain::after {
+    animation: none !important;
+    transform: none !important;
+  }
+}