/*
 * Geocities-era theme, built to stay readable.
 *
 * Rules of thumb this file follows:
 *  - Decoration lives in the frame (banner, nav, sidebar, headings). Body text
 *    sits on a solid, high-contrast panel at a comfortable measure.
 *  - Every animation is switched off by prefers-reduced-motion and by the
 *    "Reduce movement" button (html.calm).
 *  - One column under 760px; nothing forces horizontal scrolling.
 *
 * Colors and fonts are variables; override any of them from [theme] in
 * site.toml (e.g. `panel = "#fffbe6"` sets --panel).
 */

:root {
  --bg: #f7d1cd;
  --bg-2: #e8c2ca;
  --bg-image: none;            /* e.g. url(/img/tile.gif) */
  /* GIFs used from CSS go through variables so "Reduce motion" can swap
     them for a still frame (sparkle.js, CSS_GIF_VARS). */
  --gif-star: url(/gifs/star-blink.gif);
  --gif-star-spin: url(/gifs/star-spin.gif); 
  --panel: #fffaf6;
  --ink: #2a2d26;
  --muted: #6b5e66;
  --accent: #735d78;            /* banner / title bars */
  --accent-2: #b392ac;          /* sidebar */
  --accent-ink: #f7d1cd;        /* text on accent */
  --link: #0000ee;
  --visited: #551a8b;
  --hover: #ff0000;
  --face: #c0c0c0;              /* Win95 button face */
  /* blink-colors cycles these on the (light) panel, so keep them dark enough
     to read; the marquee has its own neon on black. */
  --blink-1: #e000e0;
  --blink-2: #0050ff;
  --blink-3: #ff5a00;
  --blink-4: #009a00;
  --marquee-ink: #39ff14;
  --marquee-link: #00ffff;      /* links on the marquee's black: */
  --marquee-visited: #ff77ff;   /* all 7:1+ contrast */
  --marquee-hover: #ffff00;
  --bullet: none;               /* list bullet image, e.g. url(/media/bullets/1.png) */
  --font-body: "Times New Roman", Times, "Liberation Serif", serif;
  --font-head: "Trebuchet MS", Verdana, "DejaVu Sans", sans-serif;
  --font-ui: Tahoma, Verdana, "DejaVu Sans", sans-serif;
  --font-mono: "Courier New", Courier, "Liberation Mono", monospace;
  --measure: 44rem;
  --cursor: auto;               /* e.g. url(/img/cursor.png), auto */
}

/* ---------------------------------------------------------------- frame */

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

html { cursor: var(--cursor); }

body {
  margin: 0;
  color: var(--ink);
  font: 1.1875rem/1.55 var(--font-body);
  /* Graph-paper grid: /theme/grid.svg, which build.py draws in the
     --bg-2 color from site.toml. Set --bg-image to lay a tiled GIF on top.
     Performance: keep this an image. The same grid as CSS gradients cost
     ~5x the raster time on every repaint and scroll. */
  background: var(--bg-image), url(/theme/grid.svg) var(--bg);
}

.skip { position: absolute; left: -999px; }
.skip:focus { left: 1rem; top: 1rem; z-index: 10; background: var(--panel); padding: .5rem; }

.page {
  display: grid;
  grid-template-columns: 13rem minmax(0, 1fr);
  grid-template-areas:
    "banner banner"
    "nav    main"
    "side   main"
    "foot   foot";
  grid-template-rows: auto auto 1fr auto;
  gap: 12px;
  max-width: calc(var(--measure) + 13rem + 5rem);
  margin: 0 auto;
  padding: 12px;
}

.banner  { grid-area: banner; }
.nav     { grid-area: nav; }
.window  { grid-area: main; }
.sidebar { grid-area: side; }
.footer  { grid-area: foot; }

/* Win95 bevels, reused by the panels and buttons. */
.window, .banner, .nav, .sidebar, .box, .bevel-button, .nav a {
  --bevel-hi: #ffffff; --bevel-lo: #808080; --bevel-dk: #0a0a0a; --bevel-lt: #dfdfdf;
}
.window, .box {
  box-shadow: inset -1px -1px var(--bevel-dk), inset 1px 1px var(--bevel-lt),
              inset -2px -2px var(--bevel-lo), inset 2px 2px var(--bevel-hi);
}

.banner {
  background: var(--accent);
  color: var(--accent-ink);
  padding: 18px 20px 14px;
  border: 3px ridge var(--accent-2);
}
.site-title { font: italic 3.25rem/1.05 var(--font-body); }
.site-title a:link, .site-title a:visited { color: inherit; text-decoration: none; }
.tagline { font-size: 1.1rem; margin-top: .35rem; }
.banner { position: relative; }
/* Site-wide "Updated <date>": small, top-right of the banner, so a first-time
   visitor sees the retro site is current without it competing with the title. */
.site-updated {
  position: absolute; top: 8px; right: 10px; margin: 0;
  font: .8rem var(--font-ui); color: var(--accent-ink); opacity: .9;
  padding: 1px 6px; border: 1px dotted var(--accent-ink);
}

/* ------------------------------------------------------------------ nav */

.nav {
  background: var(--accent-2);
  border: 3px ridge var(--accent);
  padding: 8px;
}
.nav ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.nav a, .bevel-button {
  display: flex; align-items: center; gap: 6px;
  padding: 5px 10px;
  background: var(--face);
  color: #000;
  font: bold .95rem var(--font-ui);
  text-decoration: none;
  border: 0;
  box-shadow: inset -1px -1px var(--bevel-dk), inset 1px 1px var(--bevel-hi),
              inset -2px -2px var(--bevel-lo), inset 2px 2px var(--bevel-lt);
  cursor: pointer;
}
.nav a:link, .nav a:visited { color: #000; }
.nav a:hover { color: #000080; }
.nav a:active, .nav a[aria-current="page"], .bevel-button[aria-pressed="true"] {
  box-shadow: inset 1px 1px var(--bevel-dk), inset -1px -1px var(--bevel-hi),
              inset 2px 2px var(--bevel-lo), inset -2px -2px var(--bevel-lt);
  padding: 6px 9px 4px 11px;
}
.nav a[aria-current="page"] { background: #d8d8d8; }
.nav-icon { width: 16px; height: 16px; image-rendering: pixelated; }

/* -------------------------------------------------------------- sidebar */

.sidebar {
  background: var(--accent-2);
  border: 3px ridge var(--accent);
  padding: 10px;
  color: var(--ink);
  font-size: 1rem;
  text-align: center;
}
.sidebar img:not(.gif):not(.button88) { max-width: 100%; height: auto; border: 3px ridge var(--accent); }
.sidebar p { margin: .5rem 0; }
.sidebar textarea {
  width: 100%; height: 5.5em; resize: vertical; font: .7rem/1.3 var(--font-mono);
  border: 2px inset var(--face); background: #fff; color: #000;
}
.sidebar h2, .sidebar h3 {
  font: bold .9rem var(--font-ui); margin: .75rem 0 .35rem; background: none; color: var(--accent-ink);
  padding: 2px; background: var(--accent);
}

/* ---------------------------------------------------------- main window */

.window {
  background: var(--panel);
  padding: 18px 26px 16px;
  min-width: 0;
}
.window > * { max-width: var(--measure); }

h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.2; }
h1 { font-size: 2rem; margin: .2rem 0 1rem; color: var(--accent); }
h2 {
  font-size: 1.35rem;
  margin: 1.75rem 0 .6rem;
  padding: 3px 8px;
  color: #fff;
  background: linear-gradient(90deg, #000080, #1084d0);  /* Win95 title bar */
}
h3 { font-size: 1.15rem; margin: 1.4rem 0 .4rem; border-bottom: 2px dotted var(--accent-2); }
h2 a.header-anchor, h3 a.header-anchor { color: inherit; text-decoration: none; }

p, ul, ol, table, pre, blockquote { margin: 0 0 1rem; }
.window ul { list-style-image: var(--bullet); }
a:link { color: var(--link); }
a:visited { color: var(--visited); }
a:hover { color: var(--hover); }
img { max-width: 100%; height: auto; }

hr { border: 0; border-top: 3px groove var(--accent-2); margin: 1.5rem 0; }

blockquote {
  margin-left: 0; padding: .25rem 1rem;
  border-left: 4px double var(--accent-2);
  color: var(--muted);
}

code, pre { font-family: var(--font-mono); font-size: .9em; }
pre {
  background: #fff; padding: 10px 12px; overflow-x: auto;
  border: 2px inset var(--face);
}

table { border-collapse: separate; border-spacing: 2px; border: 2px outset var(--face); }
th, td { border: 1px inset var(--face); padding: 3px 8px; vertical-align: top; text-align: left; }
th { background: var(--face); font-family: var(--font-ui); font-size: .95rem; }

.page-updated { margin-top: 2rem; font-size: .9rem; color: var(--muted); font-style: italic; }
.footnotes { font-size: .95rem; }

/* ----------------------------------------------------------- components */

.gif, .button88, .pixel { image-rendering: pixelated; vertical-align: middle; }
/* A GIF inside a sentence is centered on its line: top-aligned to the line,
   then moved down by half the line height (1lh) less half its own height
   (translate % is of the image itself), so a 10px icon on a 16px line
   starts 3px down. Icons taller than the line stay top-aligned and grow
   the line instead of overlapping the line above. Browsers without the lh
   unit keep the text-bottom fallback. */
.gif-inline { vertical-align: text-bottom; }
@supports (height: 1lh) {
  .gif-inline { vertical-align: top; transform: translateY(max(0px, calc(0.5lh - 50%))); }
}
.button88 { width: 88px; height: 31px; }
.button-wall { display: flex; flex-wrap: wrap; gap: 4px; justify-content: center; margin: .5rem 0 1rem; }
.button-wall a { line-height: 0; }

.gif-hr { text-align: center; margin: 1rem 0; }

.center { text-align: center; }
.center > * { margin-left: auto; margin-right: auto; }

.columns { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 1rem; }

.box { background: var(--face); padding: 3px; margin: 0 0 1rem; }
.box-title {
  display: flex; justify-content: space-between; align-items: center;
  background: linear-gradient(90deg, #000080, #1084d0);
  color: #fff; font: bold .9rem var(--font-ui); padding: 2px 3px 2px 6px;
}
.box-buttons { display: flex; gap: 2px; }
.box-buttons i {
  font-style: normal; width: 16px; height: 14px; line-height: 12px; text-align: center;
  background: var(--face); color: #000; font-size: .7rem;
  box-shadow: inset -1px -1px #0a0a0a, inset 1px 1px #fff;
}
.box-body { background: var(--panel); padding: 10px 12px; margin-top: 3px; }
.box-body > :last-child { margin-bottom: 0; }

.news td { border: 0; padding: 2px 8px 6px 0; }
.news { border: 0; }
.news-date { white-space: nowrap; font-weight: bold; color: var(--accent); }

.window .publications { padding-left: 1.5rem; list-style-image: var(--gif-star); }
.publications li { margin-bottom: .9rem; }
.pub-title { font-weight: bold; }
.pub-note { color: #c00000; font-weight: bold; }
.pub-role { font-style: italic; }
.pub-links { font-family: var(--font-ui); font-size: .9rem; }

.webring {
  text-align: center; font: bold .9rem var(--font-ui);
  border: 3px double var(--accent); padding: 4px; background: var(--panel); margin: .75rem 0;
}

.construction { border: 2px solid #000; margin: 0 0 1rem; background: #fffbe0; }
.construction-stripe { height: 14px; overflow: hidden; }
/* The stripes slide via transform (compositor-only) on an over-wide strip,
   rather than animating background-position, which repaints every frame. */
.construction-stripe::before {
  content: ""; display: block; height: 100%;
  width: calc(100% + 28.28px); margin-left: -28.28px;
  background: repeating-linear-gradient(-45deg, #000 0 10px, #ffd400 10px 20px);
  animation: stripe-scroll 1s linear infinite;
}
.construction-body { padding: 8px 12px; font-family: var(--font-ui); font-size: 1rem; }
.construction-body > :last-child { margin-bottom: 0; }

.marquee {
  overflow: hidden; white-space: nowrap;
  border: 2px inset var(--face); background: #000; color: var(--marquee-ink);
  font: bold 1rem var(--font-mono); padding: 3px 0; margin: 0 0 1rem;
}
.marquee-inner { display: inline-block; padding-left: 100%;
                 animation: marquee var(--marquee-duration, 18s) linear infinite; }
.marquee-inner > * { display: inline; margin: 0 2rem 0 0; }
.marquee a:link { color: var(--marquee-link); }
.marquee a:visited { color: var(--marquee-visited); }
.marquee a:hover, .marquee a:focus { color: var(--marquee-hover); }

.footer { text-align: center; font-size: .95rem; padding-bottom: 1rem; }
.footer p { margin: .4rem 0; }
.footer .bevel-button { display: inline-flex; margin-top: .5rem; font-size: .85rem; }

/* -------------------------------------------------------------- effects
 * Use from Markdown:  ## Heading {.blink-colors}   or   [text]{.rainbow}
 *
 * Performance: effects that animate continuously only animate transform,
 * opacity or filter, which the browser runs off the main thread without
 * repainting. Stepped effects (blink, blink-colors) are driven by sparkle.js
 * flipping html[data-blink] a few times a second; a CSS steps() animation
 * would re-run style every frame. Without JS the CSS animations below still
 * run, just less efficiently. */

.blink        { animation: blink 1s steps(1) infinite; }
.blink-colors { animation: blink-colors 1.2s steps(1) infinite; }
.rainbow {
  background: linear-gradient(90deg, #ff0000, #ff9900, #ffee00, #33cc33, #0099ff, #6633ff, #ff00cc, #ff0000);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  animation: rainbow 3s linear infinite;
}
/* filter/transform effects need a box; headings already are one. */
:where(.rainbow, .glow):not(h1, h2, h3, h4, h5, h6) { display: inline-block; }
:is(h1, h2, h3, h4):is(.rainbow, .wordart) { width: fit-content; }
h2.rainbow { background-color: transparent; padding: 0; }   /* h2 has its own background */
.glow   { animation: glow 1.6s ease-in-out infinite alternate; }
/* With sparkle.js (which copies the text into data-text): a faint static
   glow plus a copy of the text carrying the full glow, faded in and out.
   Opacity animates on the compositor; text-shadow or drop-shadow would
   repaint every frame. */
.glow[data-text] { animation: none; position: relative; text-shadow: 0 0 2px var(--blink-1); }
.glow[data-text]::after {
  content: attr(data-text); content: attr(data-text) / "";
  position: absolute; inset: 0; pointer-events: none;
  color: transparent; text-shadow: 0 0 10px var(--blink-1), 0 0 18px var(--blink-2);
  animation: glow-fade 1.6s ease-in-out infinite alternate;
}
.shake  { display: inline-block; animation: shake .35s linear infinite; }
.wobble { display: inline-block; animation: wobble 2s ease-in-out infinite; }
.sparkle::before, .sparkle::after {
  content: ""; display: inline-block; width: 1em; height: 1em; vertical-align: -.1em;
  background: var(--gif-star) center / contain no-repeat;
  image-rendering: pixelated; margin: 0 .3em;
}
.comic   { font-family: "Comic Sans MS", "Comic Neue", "Chalkboard SE", cursive; }
.wordart {
  font-family: Impact, "Arial Black", var(--font-head); font-style: italic; letter-spacing: .02em;
  background: linear-gradient(180deg, #fff200, #ff6a00 55%, #c00000);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(2px 2px 0 #000);
}
h2.wordart, h2.blink-colors, h2.glow, h2.comic { background: none; color: var(--accent); padding: 0; }
h2.wordart { background: linear-gradient(180deg, #fff200, #ff6a00 55%, #c00000); -webkit-background-clip: text; background-clip: text; color: transparent; }
.small-caps { font-variant: small-caps; }
.new-if-recent img { margin-left: .15em; }
.new-badge  { color: #fff; background: #d00000; font: bold .7em var(--font-ui); padding: 0 4px; vertical-align: .2em; }

@keyframes blink { 50% { visibility: hidden; } }

/* JS-driven stepping (see sparkle.js). */
html[data-blink] .blink, html[data-blink] .blink-colors { animation: none; }
html[data-blink$="h"] .blink { visibility: hidden; }
html[data-blink^="1"] .blink-colors { color: var(--blink-1); }
html[data-blink^="2"] .blink-colors { color: var(--blink-2); }
html[data-blink^="3"] .blink-colors { color: var(--blink-3); }
html[data-blink^="4"] .blink-colors { color: var(--blink-4); }
@keyframes blink-colors {
  0%  { color: var(--blink-1); } 25% { color: var(--blink-2); }
  50% { color: var(--blink-3); } 75% { color: var(--blink-4); }
}
@keyframes rainbow { to { filter: hue-rotate(360deg); } }
@keyframes glow {
  from { text-shadow: 0 0 2px var(--blink-1); }
  to   { text-shadow: 0 0 10px var(--blink-1), 0 0 18px var(--blink-2); }
}
@keyframes glow-fade { from { opacity: 0; } to { opacity: 1; } }


@keyframes shake { 25% { transform: translate(1px, -1px); } 75% { transform: translate(-1px, 1px); } }
@keyframes wobble { 50% { transform: rotate(-3deg) scale(1.05); } }
@keyframes marquee { to { transform: translateX(-100%); } }
@keyframes stripe-scroll { to { transform: translateX(28.28px); } }

/* Cursor trail stars (sparkle.js). */
.trail-star {
  position: fixed; pointer-events: none; z-index: 99; width: 12px; height: 12px;
  margin: -10px 0 0 -12px; /* center on the pointer */
  background: var(--gif-star-spin) center / contain no-repeat; image-rendering: pixelated;
  animation: trail-fade .7s linear forwards;
}
@keyframes trail-fade { to { opacity: 0; transform: translateY(14px) scale(.4); } }

/* ------------------------------------------------ motion off, on request */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .marquee { white-space: normal; }
  .marquee-inner { padding-left: 8px; }
  .glow::after { opacity: 0; }
}
html.calm *, html.calm *::before, html.calm *::after { animation: none !important; transition: none !important; }
html.calm .marquee { white-space: normal; }
html.calm .glow::after { opacity: 0; }
html.calm .marquee-inner { padding-left: 8px; }

/* --------------------------------------------------------------- mobile */

@media (max-width: 760px) {
  body { font-size: 1.0625rem; }
  .page {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "banner" "nav" "main" "side" "foot";
    grid-template-rows: none;
    gap: 8px; padding: 8px;
  }
  .site-title { font-size: 2.2rem; }
  .site-updated { position: static; display: inline-block; margin-top: .5rem; }
  .banner { padding: 12px 14px 10px; }
  .nav ul { display: flex; flex-wrap: wrap; }
  .nav li { flex: 1 1 auto; }
  .nav a { justify-content: center; }
  .window { padding: 14px 16px; }
  .window table { display: block; overflow-x: auto; }
  .sidebar img:not(.gif):not(.button88) { max-width: 10rem; }
}

@media print {
  body { background: #fff; }
  .nav, .sidebar, .footer, .marquee, .construction-stripe { display: none; }
  .page { display: block; }
  .window { box-shadow: none; }
  *, *::before, *::after { animation: none !important; }
}