@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&display=swap');

:root {
  --bg: #000000;
  --bg-elevated: #0a0a0a;
  --phosphor: #00FF41;
  --phosphor-dim: #00aa2a;
  --phosphor-glow: rgba(0, 255, 65, 0.4);
  --warning: #ddff00;
  --scanline: rgba(0, 255, 65, 0.03);

  --user-input:      #00ddff;
  --user-input-dim:  #0088aa;
  --user-input-glow: rgba(0, 221, 255, 0.4);

  /* Course-wide convention: yellow is reserved for AI-generated content
     (model output, streamed responses, anything that visually pretends to
     be coming from the LLM). Cyan is for student / user input. */
  --ai:      #ffd93d;
  --ai-dim:  #b89a2a;
  --ai-glow: rgba(255, 217, 61, 0.4);

  --font-mono: "JetBrains Mono", "Fira Code", "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--phosphor);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  text-shadow: 0 0 1px var(--phosphor-glow);
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed; inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom, transparent 0, transparent 2px,
    var(--scanline) 2px, var(--scanline) 3px
  );
  z-index: 100;
}
body::after {
  content: '';
  position: fixed; inset: 0;
  pointer-events: none;
  border-radius: 2vmin;
  box-shadow: inset 0 0 12vmin rgba(0,0,0,0.65);
  z-index: 101;
}

.about-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 16px 32px;
  border-bottom: 1px solid var(--phosphor-dim);
  font-size: 11px;
  letter-spacing: 0.2em;
  position: sticky;
  top: 0;
  background: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(4px);
  z-index: 50;
}
.brand { display: flex; align-items: baseline; gap: 8px; }
.brand-name    { color: var(--phosphor); font-weight: 700; }
.brand-sep     { color: var(--phosphor-dim); }
.brand-section { color: var(--phosphor); }
.brand-version { color: var(--phosphor-dim); font-size: 9px; margin-left: 6px; }

.about-nav { display: flex; gap: 18px; }
.about-link {
  color: var(--phosphor-dim);
  text-decoration: none;
  font-size: 10px;
  letter-spacing: 0.2em;
}
.about-link:hover {
  color: var(--phosphor);
  text-shadow: 0 0 4px var(--phosphor);
}

.about-main {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 32px 80px;
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.prose h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--phosphor);
  margin-bottom: 14px;
}
.prose h2 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--phosphor);
  margin-top: 8px;
  margin-bottom: 12px;
  border-bottom: 1px dashed var(--phosphor-dim);
  padding-bottom: 6px;
}
.prose h3 {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--phosphor);
  margin-top: 20px;
  margin-bottom: 6px;
}
.prose .lede {
  font-size: 15px;
  color: var(--phosphor);
  line-height: 1.7;
}
.prose p {
  margin-bottom: 14px;
  color: var(--phosphor);
}
.prose strong { color: var(--phosphor); font-weight: 700; }
.prose em { font-style: italic; color: var(--phosphor); }
.prose code {
  background: var(--bg-elevated);
  border: 1px solid var(--phosphor-dim);
  padding: 1px 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--user-input);
  border-radius: 2px;
  white-space: nowrap;
}

.prose ul,
.prose ol,
.prose .loop-list {
  list-style: none;
  padding-left: 0;
  margin-bottom: 14px;
}
.prose ul li,
.prose ol li,
.prose .loop-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 8px;
  color: var(--phosphor);
}
.prose ul li::before {
  content: '\25CB';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--phosphor-dim);
  font-size: 10px;
  line-height: 1.8;
}
.prose ol,
.prose .loop-list {
  counter-reset: item;
}
.prose ol li,
.prose .loop-list li {
  counter-increment: item;
}
.prose ol li::before,
.prose .loop-list li::before {
  content: counter(item, decimal-leading-zero) '.';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--phosphor-dim);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.05em;
}

.prose a { color: var(--user-input); text-decoration: none; }
.prose a:hover { text-shadow: 0 0 4px var(--user-input-glow); text-decoration: underline; }

.about-footer {
  text-align: center;
  padding: 24px 16px;
  border-top: 1px solid var(--phosphor-dim);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--phosphor-dim);
}

/* ---------- FAQ as mini chat session ----------
   Each Q+A reads like a two-message exchange:
   - The clicked question becomes a "sent" bubble on the user side (cyan).
   - The answer appears below as a "reply" bubble (phosphor green) - the
     content is teacher-authored prose that just visually mimics streaming;
     it is NOT AI-generated, so it stays in the site's primary color
     rather than the yellow reserved for actual model output. */

.intro { text-align: left; }
.intro .lede { color: var(--phosphor-dim); font-size: 13px; }

.faq {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.faq-item {
  padding: 4px 0;
}

.faq-question {
  width: 100%;
  text-align: left;
  background: var(--bg);
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 12px 16px;
  cursor: pointer;
  display: flex;
  gap: 10px;
  align-items: baseline;
  transition: border-color 180ms, color 180ms;
}

.faq-prompt {
  color: var(--user-input-dim);
  font-weight: 700;
  flex-shrink: 0;
  transition: color 180ms;
}

.faq-q-text {
  color: var(--user-input-dim);
  transition: color 180ms, text-shadow 180ms;
}

.faq-question:hover .faq-q-text {
  color: var(--user-input);
  text-shadow: 0 0 4px var(--user-input-glow);
}

/* Open state - the question becomes a "sent" panel on the user side:
   simple square 1px cyan border, plain black background like the
   build_tool's viewers, slight right margin so it doesn't stretch
   full-width and the conversation feels balanced. */
.faq-item.open .faq-question {
  border-color: var(--user-input-dim);
  margin-right: clamp(0px, 8vw, 80px);
}
.faq-item.open .faq-prompt,
.faq-item.open .faq-q-text {
  color: var(--user-input);
  text-shadow: 0 0 4px var(--user-input-glow);
}

/* Answer panel - simple square 1px phosphor-green border, plain black
   background like the build_tool's viewers, indented from the left so
   it visually sits under-and-across from the question panel like a
   reply in a chat thread. */
.faq-answer {
  display: none;
  margin: 8px 0 4px clamp(20px, 6vw, 56px);
  padding: 14px 18px;
  background: var(--bg);
  border: 1px solid var(--phosphor-dim);
}
.faq-answer.open { display: block; }

.faq-a-content {
  color: var(--phosphor);
  text-shadow: 0 0 1px var(--phosphor-glow);
}
.faq-a-content p:last-child { margin-bottom: 0; }
.faq-a-content p,
.faq-a-content li,
.faq-a-content h3,
.faq-a-content strong,
.faq-a-content em { color: var(--phosphor); }

.faq-a-content h3 {
  font-size: 13px;
  letter-spacing: 0.05em;
  margin-top: 18px;
  margin-bottom: 6px;
}
.faq-a-content ul li::before,
.faq-a-content ol li::before,
.faq-a-content .loop-list li::before { color: var(--phosphor-dim); }

/* Inline code that names an AI feature (// ASK AI //, // REVIEW //,
   // CHECK COMMENTS //) wears the AI color so the convention shows up
   in prose the same way it does on the buttons themselves. */
.faq-a-content code.ai {
  color: var(--ai);
  border-color: var(--ai-dim);
}

/* Blinking block cursor at the end of the streaming text. Disappears
   when the .done class is added (typewriter finished). */
.faq-a-content::after {
  content: '\2588';
  display: inline-block;
  color: var(--phosphor);
  margin-left: 2px;
  animation: faq-cursor-blink 700ms steps(2) infinite;
}
.faq-a-content.done::after { display: none; }
@keyframes faq-cursor-blink { 50% { opacity: 0; } }