/* ============================================================
   agent.html — How Ergod Thinks
   Long-form, technical, scannable. Sections grouped with a
   left-rail label motif; pinned TOC on wide screens.
   ============================================================ */

.agent-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 64px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 28px 96px;
}

/* ─── TOC (sticky on wide screens) ─── */
.agent-toc {
  position: sticky;
  top: 88px;
  align-self: start;
  font-size: 0.875rem;
  border-left: 1px solid var(--color-border);
  padding-left: 18px;
}
.agent-toc-label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: 14px;
}
.agent-toc-list { display: flex; flex-direction: column; gap: 2px; }
.agent-toc-list a {
  display: block;
  padding: 6px 10px;
  margin-left: -11px;
  border-left: 2px solid transparent;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  border-radius: 0 6px 6px 0;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}
.agent-toc-list a:hover {
  color: var(--color-text);
  background: var(--color-surface-elevated);
}
.agent-toc-list a.is-active {
  color: var(--color-text);
  border-left-color: var(--color-primary);
  background: var(--color-surface-elevated);
}

.agent-content { min-width: 0; }

/* ─── Section group ─── */
.agent-group {
  padding: 56px 0;
  border-top: 1px solid var(--color-border);
  scroll-margin-top: 88px;
}
.agent-group:first-child { padding-top: 16px; border-top: none; }
.agent-group-label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.agent-group-label::before {
  content: '';
  width: 18px;
  height: 1px;
  background: var(--color-primary);
}
.agent-group h2 {
  font-size: clamp(1.6rem, 3.2vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 18px;
  text-wrap: balance;
}
.agent-group h2 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--color-primary-bright), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  /* avoid descender clipping on italic letters */
  padding-right: 0.05em;
}
.agent-group p {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
  max-width: 68ch;
}
.agent-group p:last-child { margin-bottom: 0; }
.agent-group p strong { color: var(--color-text); font-weight: 600; }
.agent-group .intro {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  margin-bottom: 22px;
}

/* ─── Callout ─── */
.agent-callout {
  margin: 22px 0 0;
  padding: 18px 22px;
  background:
    linear-gradient(180deg, rgba(129,140,248,0.06), transparent 80%),
    var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 68ch;
}
.agent-callout strong { color: var(--color-text); font-weight: 600; }

/* ─── Prompt block (collapsible <details>) ─── */
.prompt-block {
  margin: 18px 0 0;
  background: var(--color-surface-overlay);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.18s;
}
.prompt-block[open] { border-color: var(--color-border-strong); }
.prompt-block > summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-surface-elevated);
  border-bottom: 1px solid transparent;
  transition: background 0.15s;
  user-select: none;
}
.prompt-block > summary::-webkit-details-marker { display: none; }
.prompt-block > summary:hover { background: var(--color-surface-high); }
.prompt-block[open] > summary { border-bottom-color: var(--color-border); }
.prompt-block-chev {
  width: 14px; height: 14px;
  flex-shrink: 0;
  color: var(--color-text-dim);
  transition: transform 0.18s;
}
.prompt-block[open] .prompt-block-chev { transform: rotate(90deg); }
.prompt-block-tag {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(129,140,248,0.12);
  color: var(--color-primary-bright);
  border: 1px solid rgba(129,140,248,0.25);
  letter-spacing: 0.02em;
}
.prompt-block-tag.is-cond {
  background: rgba(245,191,90,0.10);
  color: #ffd47e;
  border-color: rgba(245,191,90,0.25);
}

.prompt-pre {
  margin: 0;
  padding: 22px 24px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  white-space: pre-wrap;
  word-wrap: break-word;
  background: var(--color-surface-overlay);
  overflow-x: auto;
  tab-size: 2;
}
.prompt-pre .ph {
  color: #ffd47e;
  font-weight: 500;
}
.prompt-pre .hd {
  color: var(--color-text);
  font-weight: 600;
}
.prompt-pre .com {
  color: var(--color-primary-bright);
}

/* ─── Tool inventory ─── */
.tool-cats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 8px;
}
.tool-cat {
  padding: 22px;
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.tool-cat-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.tool-cat-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}
.tool-cat-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-dim);
  font-weight: 500;
  letter-spacing: 0.02em;
}
.tool-cat-meta .meta-dot {
  display: inline-block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--color-success);
  margin: 0 6px 1px;
  vertical-align: middle;
}
.tool-cat-meta.on-demand .meta-dot { background: var(--color-amber); }
.tool-cat-meta.mixed .meta-dot { background: var(--color-primary); }
.tool-cat p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}
.tool-list {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-top: auto;
  padding-top: 6px;
}
.tool-list code {
  background: var(--color-surface-high);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 9px;
  border-radius: 6px;
}
.tool-list code.is-pro {
  background: rgba(245,191,90,0.10);
  border-color: rgba(245,191,90,0.30);
  color: #ffd47e;
}
.tool-list code.is-special {
  background: rgba(129,140,248,0.12);
  border-color: rgba(129,140,248,0.32);
  color: var(--color-primary-bright);
}

/* ─── Boundaries / rough edges (annotated lists) ─── */
.fact-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 8px;
}
.fact-list li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}
.fact-list li:last-child { border-bottom: none; }
.fact-list li::before {
  content: attr(data-mark);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-dim);
  padding-top: 3px;
}
.fact-list li strong {
  display: block;
  color: var(--color-text);
  font-weight: 600;
  margin-bottom: 2px;
}

/* ─── Page-end CTA ─── */
.agent-cta {
  margin: 80px auto 0;
  padding: 56px 32px;
  text-align: center;
  background:
    radial-gradient(ellipse 50% 80% at 50% 100%, rgba(129,140,248,0.18), transparent 60%),
    var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  max-width: 720px;
}
.agent-cta h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
}
.agent-cta h2 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--color-primary-bright), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  padding-right: 0.05em;
}
.agent-cta p {
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.65;
  max-width: 520px;
  margin: 0 auto 24px;
}
.agent-cta-btns {
  display: inline-flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ─── Responsive ─── */
@media (max-width: 1020px) {
  .agent-layout {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 22px 80px;
  }
  .agent-toc {
    position: static;
    border-left: none;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: 18px 0;
    order: -1;
  }
  .agent-toc-list {
    flex-direction: row;
    overflow-x: auto;
    gap: 0;
    padding-bottom: 4px;
  }
  .agent-toc-list a {
    margin-left: 0;
    white-space: nowrap;
    border-left: none;
    border-bottom: 2px solid transparent;
    border-radius: 0;
  }
  .agent-toc-list a.is-active {
    border-left: none;
    border-bottom-color: var(--color-primary);
    background: transparent;
  }
}
@media (max-width: 720px) {
  .tool-cats { grid-template-columns: 1fr; }
  .prompt-pre { font-size: 0.75rem; padding: 16px 18px; }
}