/* Phosphor-green terminal palette, scoped to the AI page. */
:root {
  --paper: #eef8ef;
  --paper-deep: #dceee0;
  --ink: #183624;
  --muted: #45614e;
  --section-blue: #14592f;
  --white: #fbfef9;
  --blue: #11672b;
  --green: #216c3a;
  --sky: #216c3a;
  --clay: #4c6e24;
  --plum: #246d58;
  --line: rgba(36, 83, 48, 0.22);
  --ai-text: #244231;
  --theme-header: rgba(238, 248, 239, 0.97);
  --ai-surface: rgba(238, 248, 239, 0.96);
  --ai-terminal: rgba(225, 241, 229, 0.98);
  --ai-bloom: rgba(20, 130, 62, 0.09);
  --ai-glow: transparent;
  --ai-rain: #20733d;
  --ai-rain-opacity: 0.13;
  --ai-link-ink: #f2fff5;
  --figure-bg: #e8f1e5;
  --figure-ink: #244333;
  --figure-muted: #476452;
  --figure-line: #92b89d;
  --figure-accent: #16763a;
  --figure-soft: #cee8d1;
  --figure-contrast: #f7fcf6;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}
:root[data-theme="dark"], :root:not([data-theme]) {
  --paper: #030906;
  --paper-deep: #091c10;
  --ink: #e3ffec;
  --muted: #a3c6ae;
  --section-blue: #ceffdd;
  --white: #0a1b11;
  --blue: #61ff8d;
  --green: #61ff8d;
  --sky: #61ff8d;
  --clay: #b6e880;
  --plum: #83d8b8;
  --line: rgba(97, 255, 141, 0.25);
  --ai-text: #c7dfd0;
  --theme-header: rgba(3, 9, 6, 0.98);
  --ai-surface: rgba(3, 9, 6, 0.96);
  --ai-terminal: rgba(6, 19, 11, 0.98);
  --ai-bloom: rgba(25, 255, 109, 0.10);
  --ai-glow: rgba(73, 255, 127, 0.22);
  --ai-rain: #39ed77;
  --ai-rain-opacity: 0.48;
  --ai-link-ink: #021408;
  --figure-bg: #06140b;
  --figure-ink: #ceffdd;
  --figure-muted: #9ac9aa;
  --figure-line: #447b56;
  --figure-accent: #61ff8d;
  --figure-soft: #133b22;
  --figure-contrast: #030906;
  color-scheme: dark;
}
body.ai-page {
  position: relative;
  isolation: isolate;
  background: var(--paper);
}
.ai-atmosphere {
  position: fixed;
  inset: var(--head) 0 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
  user-select: none;
  background: radial-gradient(ellipse at 92% 10%, var(--ai-bloom), transparent 48%),
    radial-gradient(ellipse at 0% 75%, var(--ai-bloom), transparent 45%);
}
.ai-atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(0deg, transparent 0 3px, rgba(0, 12, 4, 0.16) 3px 4px);
}
.ai-code-rain { display: none; width: 100%; height: 100%; opacity: var(--ai-rain-opacity); }
.ai-atmosphere.is-animated .ai-code-rain { display: block; }
.ai-atmosphere.is-animated .ai-code-column { display: none; }
.ai-code-column {
  position: absolute;
  top: var(--y);
  left: var(--x);
  writing-mode: vertical-rl;
  text-orientation: upright;
  white-space: nowrap;
  color: var(--ai-rain);
  font: 400 17px / 1 var(--mono);
  letter-spacing: 5px;
  opacity: var(--ai-rain-opacity);
  text-shadow: 0 0 8px var(--ai-glow);
  mask-image: linear-gradient(transparent, #000 14%, #000 80%, transparent);
  animation: ai-code-arrive var(--arrival) ease-out var(--delay) both;
}
/* Static fallback when canvas is unavailable; the live field has a pause control. */
@keyframes ai-code-arrive {
  from { transform: translateY(-64px); opacity: 0; }
  to { transform: translateY(0); opacity: var(--ai-rain-opacity); }
}
.ai-page ::selection { background: var(--figure-accent); color: var(--figure-contrast); }
.ai-page .skip-link { background: var(--ink); color: var(--paper); }
.ai-page .site-header {
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 20px var(--ai-glow);
}
.ai-page .brand { font-family: var(--mono); letter-spacing: -0.06em; }
.ai-page .site-nav { font-family: var(--mono); }
.ai-page .theme-toggle {
  font-family: var(--mono);
  border-radius: 0;
  border-color: var(--line);
  background: var(--ai-terminal);
}
.ai-page main {
  max-width: 1440px;
  margin: 0 auto;
  padding: calc(var(--head) + 42px) var(--page-pad) 64px;
}
.ai-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 252px;
  grid-template-areas:
    "opening contents"
    "research contents"
    "footer contents";
  column-gap: clamp(32px, 4vw, 64px);
  align-items: start;
}
.ai-opening {
  grid-area: opening;
  min-width: 0;
  padding: 6px 24px 30px;
  background: var(--ai-surface);
  scroll-margin-top: 28px;
}
.ai-research {
  grid-area: research;
  min-width: 0;
  padding: 0 24px;
  background: var(--ai-surface);
}
.ai-opening h1 {
  display: grid;
  margin: 0 0 14px;
  color: var(--blue);
  font: 600 clamp(2.25rem, 4.2vw, 4.1rem) / 1.08 var(--mono);
  letter-spacing: -0.065em;
  text-shadow: 0 0 30px var(--ai-glow), 0 0 2px var(--ai-glow);
}
.ai-animated-title::before {
  content: attr(aria-label);
  visibility: hidden;
  grid-area: 1 / 1;
  padding-right: 0.5em;
}
.ai-title-line { grid-area: 1 / 1; }
.ai-title-cursor {
  content: "";
  display: inline-block;
  width: 0.22em;
  height: 0.72em;
  margin-left: 0.18em;
  background: var(--blue);
  box-shadow: 0 0 12px var(--ai-glow);
}
[data-ai-effects="running"] .ai-title-cursor { animation: ai-caret 1s step-end infinite; }
@keyframes ai-caret { 50% { opacity: 0; } }
.ai-motion-toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 32px;
  margin: 0 0 22px;
  padding: 5px 9px;
  border: 1px solid var(--line);
  background: var(--ai-terminal);
  color: var(--muted);
  font: 400 0.68rem / 1.4 var(--mono);
  cursor: pointer;
}
.ai-motion-toggle[hidden] { display: none; }
.ai-motion-toggle:hover { color: var(--blue); border-color: var(--blue); }
.ai-motion-toggle:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }
.ai-motion-icon { width: 1em; text-align: center; }
.ai-introduction {
  max-width: 820px;
  color: var(--ai-text);
  font: 400 1.13rem / 1.65 var(--serif);
}
.ai-introduction p {
  margin: 0 0 17px;
}
.ai-placeholder {
  padding: 20px 24px;
  border-left: 2px solid var(--section-blue);
  color: var(--muted);
}
.ai-sidebar {
  grid-area: contents;
  position: sticky;
  top: calc(var(--head) + 28px);
  max-height: calc(100vh - var(--head) - 56px);
  max-height: calc(100dvh - var(--head) - 56px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  border: 1px solid var(--line);
  border-top: 2px solid var(--blue);
  padding: 22px 18px;
  background: var(--ai-terminal);
  box-shadow: 0 0 28px var(--ai-glow);
}
.ai-toc h2 {
  margin: 0 0 20px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--line);
  color: var(--section-blue);
  font: 600 0.74rem / 1.5 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.ai-toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
}
.ai-toc-group + .ai-toc-group {
  margin-top: 17px;
}
.ai-toc a {
  display: block;
  padding: 5px 0;
  line-height: 1.4;
}
.ai-toc-topic {
  color: var(--section-blue);
  font: 600 0.8rem / 1.4 var(--mono);
}
.ai-toc .ai-toc-projects {
  margin-top: 3px;
  padding-left: 13px;
  border-left: 1px solid var(--line);
}
.ai-toc-projects a {
  color: var(--muted);
  font: 400 0.78rem / 1.4 var(--sans);
}
.ai-toc a:hover,
.ai-toc a:focus-visible {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.ai-topic {
  padding: 28px 0 30px;
  border-top: 1px solid var(--line);
  scroll-margin-top: 28px;
}
.ai-topic-body {
  min-width: 0;
}
.ai-topic-heading {
  min-width: 0;
}
.ai-topic-summary {
  max-width: 56ch;
  margin: 10px 0 0;
  color: var(--muted);
  font: 400 1.05rem / 1.55 var(--serif);
}
.ai-topic-number {
  margin: 0 0 10px;
  color: var(--sky);
  font: 600 0.7rem / 1.4 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.ai-topic-number::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin: 0 9px 1px 0;
  background: currentColor;
  box-shadow: 0 0 9px var(--ai-glow);
}
#arw .ai-topic-number {
  color: var(--clay);
}
#grid-clusters .ai-topic-number {
  color: var(--green);
}
#coupon-collection .ai-topic-number {
  color: var(--plum);
}
#balloon-process .ai-topic-number {
  color: var(--clay);
}
.ai-project-figure {
  margin: 0;
  width: 100%;
  max-width: 280px;
  justify-self: end;
}
.ai-project-figure svg {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--figure-bg);
  box-shadow: 0 0 18px var(--ai-glow);
}
.ai-project-figure figcaption {
  margin-top: 12px;
  color: var(--muted);
  font: 400 0.73rem / 1.5 var(--sans);
}
.ai-topic h2 {
  margin: 0;
  color: var(--section-blue);
  font: 500 clamp(1.65rem, 2.7vw, 2.25rem) / 1.15 var(--mono);
  letter-spacing: -0.055em;
}
.ai-entries {
  min-width: 0;
  padding-top: 18px;
}
.ai-entry {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(190px, 31%);
  gap: 24px;
  align-items: start;
  padding: 0 0 20px;
  margin: 0 0 20px;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 28px;
}
.ai-entry-copy { min-width: 0; }
.ai-entry:target h3 {
  text-decoration: underline;
  text-decoration-color: var(--sky);
  text-underline-offset: 5px;
}
.ai-entry:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}
.ai-entry h3 {
  margin: 0 0 10px;
  color: var(--section-blue);
  font: 400 1.45rem / 1.25 var(--serif);
  letter-spacing: -0.018em;
}
.ai-entry p {
  max-width: 74ch;
  margin: 0;
  color: var(--ai-text);
  font: 400 1.05rem / 1.6 var(--serif);
}
.ai-entry p + p {
  margin-top: 12px;
}
.ai-entry .ai-entry-status {
  margin-top: 11px;
  color: var(--muted);
  font: 500 0.72rem / 1.5 var(--sans);
}
.ai-entry .ai-entry-links {
  margin-top: 14px;
  font: 600 0.75rem / 1.5 var(--mono);
}
.ai-entry-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 12px;
  color: var(--blue);
  border: 1px solid var(--blue);
  background: var(--ai-terminal);
  text-decoration: none;
}
.ai-entry-links a:hover,
.ai-entry-links a:focus-visible { color: var(--ai-link-ink); background: var(--blue); }
.ai-entry-links a:hover .ai-pdf-pages,
.ai-entry-links a:focus-visible .ai-pdf-pages { color: inherit; }
.ai-pdf-pages {
  color: var(--muted);
  font-weight: 400;
}
.ai-entry .ai-pdf-pending {
  margin-top: 12px;
  color: var(--muted);
  font: 400 0.78rem / 1.5 var(--sans);
}
.ai-footer {
  grid-area: footer;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  background: var(--ai-surface);
}
.ai-footer a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  font-size: 0.82rem;
  text-decoration: underline;
  text-underline-offset: 4px;
}
@media (max-width: 1080px) {
  .ai-layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "opening" "contents" "research" "footer";
  }
  .ai-sidebar {
    position: static;
    max-height: none;
    overflow: visible;
    margin: 0 24px 28px;
    padding: 22px;
  }
  .ai-toc-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 32px;
  }
  .ai-toc-group + .ai-toc-group {
    margin-top: 0;
  }
}
@media (max-width: 680px) {
  .ai-entry {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }
  .ai-project-figure { max-width: 360px; justify-self: start; }
}
@media (max-width: 600px) {
  .ai-page main {
    padding-top: calc(var(--head) + 28px);
  }
  .ai-toc-list {
    grid-template-columns: minmax(0, 1fr);
  }
  .ai-toc a {
    padding: 9px 0;
    font-size: 0.85rem;
  }
  .ai-project-figure {
    width: 100%;
  }
  .ai-introduction {
    font-size: 1.05rem;
  }
  .ai-opening { padding-right: 0; padding-left: 0; }
  .ai-research { padding: 0; }
  .ai-sidebar { margin-right: 0; margin-left: 0; padding: 18px; }
  .ai-code-column:nth-child(even) { display: none; }
  .ai-atmosphere { opacity: 0.55; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .ai-code-column { animation: none; }
  [data-ai-effects="running"] .ai-title-cursor { animation: none; }
}
@media print {
  .ai-atmosphere, .ai-motion-toggle, .ai-title-line { display: none; }
  .ai-animated-title::before { visibility: visible; }
  .ai-opening h1, .ai-project-figure svg, .ai-sidebar { text-shadow: none; box-shadow: none; }
}