/* AI Tools and Applications book – builds on ../style.css */

.book {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 20px 0;
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 48px;
  align-items: start;
}

/* ── Sidebar ── */
.book-side { position: sticky; top: 72px; }
/* On phones the chapter list collapses behind this button (see the media query below). */
.toc-wrap summary {
  display: none;
  cursor: pointer;
  list-style: none;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-family: "Inter Tight", sans-serif;
  font-size: 16px;
  font-weight: 600;
  color: var(--paper);
  padding: 13px 16px;
  border: 1px solid var(--rust);
  background: var(--rust);
  border-radius: 2px;
  -webkit-tap-highlight-color: transparent;
}
.toc-wrap summary::-webkit-details-marker { display: none; }
.toc-wrap summary::after {
  content: "";
  width: 9px;
  height: 9px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  transition: transform .15s;
}
.toc-wrap[open] summary::after { transform: translateY(2px) rotate(-135deg); }
.toc { display: flex; flex-direction: column; font-size: 13.5px; }
.toc a {
  display: flex;
  gap: 8px;
  color: var(--muted);
  text-decoration: none;
  padding: 5px 8px;
  border-left: 2px solid transparent;
  line-height: 1.35;
}
.toc a:hover { color: var(--rust); }
.toc a.current { color: var(--ink); font-weight: 600; border-color: var(--rust); background: rgba(184, 67, 10, .06); }
.toc-home { font-weight: 600; margin-bottom: 6px; }
.toc-num { font-family: "JetBrains Mono", monospace; font-size: 11.5px; color: var(--rust); min-width: 18px; padding-top: 1px; }
.toc-unit {
  font-family: "JetBrains Mono", monospace;
  font-size: 10.5px;
  letter-spacing: .04em;
  color: var(--muted);
  margin: 16px 0 4px 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line2);
}

/* ── Chapter ── */
.book-main { min-width: 0; }
.chapter { max-width: 68ch; font-size: 17px; line-height: 1.7; }
.chapter h1 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 28px; }
.chapter h2 { font-size: 23px; margin: 40px 0 12px; }
.chapter h3 { font-size: 18px; margin: 24px 0 8px; }
.chapter p { margin: 0 0 16px; }
.chapter ul, .chapter ol { margin: 0 0 16px 24px; }
.chapter li { margin-bottom: 6px; }
.chapter a { color: var(--rust); font-weight: 600; }
.chapter a:hover { color: #96370a; }
.chapter strong { color: var(--ink); }
.chapter code {
  font-family: "JetBrains Mono", monospace;
  font-size: .88em;
  background: rgba(43, 38, 34, .07);
  padding: 1px 5px;
  border-radius: 2px;
}
.chapter pre.code {
  margin: 0 0 18px;
  padding: 16px 18px;
  background: #1f1b18;
  color: #e9e1d6;
  font-family: "JetBrains Mono", monospace;
  font-size: 13.5px;
  line-height: 1.6;
  overflow-x: auto;
  border-radius: 2px;
}
.chapter pre.code code { background: none; padding: 0; font-size: inherit; }

.chapter table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 20px;
  font-size: 15px;
  background: var(--paper);
}
.chapter th, .chapter td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
.chapter th { font-family: "JetBrains Mono", monospace; font-size: 12px; color: var(--rust); background: var(--cream); }

/* prompt box */
.prompt {
  margin: 0 0 20px;
  border: 1px solid var(--teal);
  border-radius: 2px;
  background: var(--paper);
}
.prompt-label {
  display: block;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--paper);
  background: var(--teal);
  padding: 4px 12px;
}
.prompt pre {
  margin: 0;
  padding: 14px 16px;
  font-family: "Inter Tight", sans-serif;
  font-size: 15.5px;
  line-height: 1.6;
  white-space: pre-wrap;
  color: var(--ink);
}

/* note / callout */
.note {
  margin: 0 0 20px;
  padding: 12px 16px;
  border-left: 3px solid var(--rust);
  background: rgba(184, 67, 10, .06);
  font-size: 16px;
}

/* New words and Try it sections */
section.words, section.try {
  margin-top: 40px;
  padding: 20px 22px 8px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--paper);
}
section.words h2, section.try h2 {
  font-family: "JetBrains Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--rust);
  margin: 0 0 12px;
}
section.words ul, section.try ul { margin-left: 0; list-style: none; }
section.words li { font-size: 15.5px; padding-left: 0; }
section.words li strong { color: var(--teal); }
section.try { border-color: var(--teal); }
section.try h2 { color: var(--teal); }
section.try li { font-size: 15.5px; }

/* contents page */
.chapter .unit-list { list-style: none; margin: 0 0 8px; counter-reset: ch; }
.chapter .unit-list li { counter-increment: ch; }

/* prev / next */
.prev-next {
  max-width: 68ch;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 48px 0 0;
}
.prev-next a {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 2px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  font-size: 15px;
  transition: border-color .15s;
}
.prev-next a:hover { border-color: var(--rust); }
.prev-next a span {
  display: block;
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  color: var(--rust);
  font-weight: 400;
  margin-bottom: 4px;
}
.pn-next { text-align: right; }

/* ── Responsive ── */
@media (max-width: 860px) {
  .book { grid-template-columns: 1fr; gap: 24px; padding: 24px 16px 0; }
  .book-side { position: static; }
  .toc-wrap summary { display: flex; }
  .toc-wrap[open] summary { border-radius: 2px 2px 0 0; }
  .toc {
    padding: 8px 6px 10px;
    border: 1px solid var(--rust);
    border-top: 0;
    background: var(--paper);
    border-radius: 0 0 2px 2px;
    font-size: 15px;
  }
  .toc a { padding: 8px 10px; }
  .toc-num { font-size: 12.5px; min-width: 22px; }
  .toc-unit { font-size: 11.5px; margin: 14px 0 4px 10px; }
  .chapter { font-size: 16px; }
  .prev-next { grid-template-columns: 1fr; }
  .pn-next { text-align: left; }
}