92 lines
2.6 KiB
CSS
92 lines
2.6 KiB
CSS
/* ==========================================================================
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tui-pages website - animated ASCII mountain background (chafa-rendered)
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The mountain background is JS-driven: tools/mountain.py renders 60
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procedural 3D mountain-flyover PNG frames; chafa converts each to 80x24
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ASCII; tools/build_mountain_js.py bundles them into static/js/mountain.js.
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static/js/mountain-bg.js cycles the frames at 12 fps into the
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<pre id="tp-mountain-bg" class="tp-mountain-bg"> placeholder in index.html.
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This CSS file:
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- positions the frame as a full-screen top layer
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- tints the dense characters rust-orange with text-shadow + glow
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- adds a CRT scanline overlay
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- disables the animation under prefers-reduced-motion
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========================================================================== */
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/* Full-screen ASCII mountain top layer ----------------------------------- */
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.tp-mountain-bg {
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position: absolute;
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top: 0;
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left: 0;
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display: block;
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width: 100vw;
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height: 100vh;
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height: 100svh;
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z-index: 0;
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pointer-events: none;
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margin: 0;
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padding: 0;
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font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
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font-size: max(0.35vw, 0.695vh);
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font-size: max(0.35vw, 0.695svh);
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line-height: 1.0;
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letter-spacing: 0;
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color: #f4a26b;
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text-shadow: 0 0 8px rgba(183, 65, 14, 0.35);
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opacity: 0.45;
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white-space: pre;
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background: transparent;
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overflow: hidden;
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user-select: none;
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}
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/* CRT scanlines overlay - a thin moving line every 2px. Faint so it doesn't
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fight the page content. */
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.tp-mountain-bg::after {
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content: "";
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position: absolute;
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inset: 0;
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background: repeating-linear-gradient(
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to bottom,
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transparent 0,
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transparent 2px,
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rgba(0, 0, 0, 0.20) 2px,
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rgba(0, 0, 0, 0.20) 3px
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);
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pointer-events: none;
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animation: tp-mtn-scanline 8s linear infinite;
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mix-blend-mode: multiply;
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}
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@keyframes tp-mtn-scanline {
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0% { background-position: 0 0; }
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100% { background-position: 0 6px; }
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}
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/* Light theme: dim the background, drop the glow, switch to dark text. */
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:root[data-theme="winter"] .tp-mountain-bg {
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opacity: 0.20;
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color: #2a1810;
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text-shadow: none;
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mix-blend-mode: multiply;
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}
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:root[data-theme="winter"] .tp-mountain-bg::after {
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background: repeating-linear-gradient(
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to bottom,
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transparent 0,
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transparent 2px,
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rgba(255, 255, 255, 0.12) 2px,
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rgba(255, 255, 255, 0.12) 3px
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);
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mix-blend-mode: screen;
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}
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/* Reduced motion: keep the first frame static, no scanline drift. */
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@media (prefers-reduced-motion: reduce) {
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.tp-mountain-bg::after {
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animation: none !important;
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}
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}
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