/* Arthabase interior pages: about, use cases, API, B2B.
   Depends on tokens in style.css (--ab-*). Light institutional mode. */

.page-body {
  background-color: var(--ab-bg);
  color: var(--ab-ink);
}

.page-shell {
  max-width: var(--site-shell-max);
  margin: 0 auto;
  padding-left: var(--site-gutter);
  padding-right: var(--site-gutter);
}

.page-section {
  padding-top: clamp(3rem, 6vw, 5rem);
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

.page-section--muted {
  background: var(--ab-bg-muted);
}

.page-section--raised {
  background: var(--ab-bg-raised);
}

/* ── Breadcrumb ─────────────────────────────────────────────── */
.page-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.5rem;
  margin-bottom: 1.5rem;
  font-size: var(--text-sm);
  color: var(--ab-ink-muted);
}

.page-breadcrumb a {
  color: var(--ab-ink-secondary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.page-breadcrumb a:hover {
  color: var(--ab-accent);
}

.page-breadcrumb-sep {
  color: var(--ab-ink-muted);
  user-select: none;
}

.page-breadcrumb-current {
  color: var(--ab-ink-muted);
}

/* ── Page hero (light, no cards) ────────────────────────────── */
.page-hero {
  padding-top: calc(env(safe-area-inset-top, 0px) + 5.5rem);
  padding-bottom: clamp(2.5rem, 5vw, 4rem);
}

.page-brand {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ab-ink-muted);
  margin: 0 0 0.75rem;
}

.page-hero-title {
  font-size: var(--text-4xl);
  font-weight: 500;
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-tight);
  color: var(--ab-ink);
  margin: 0;
  max-width: 22ch;
  text-wrap: balance;
}

.page-hero-lead {
  margin-top: 1rem;
  max-width: var(--hero-lead-max-width);
  font-size: 1.0625rem;
  line-height: var(--hero-lead-line-height);
  color: var(--ab-ink-secondary);
}

.page-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.875rem;
  margin-top: 1.75rem;
}

.page-hero-actions--light .btn-atlas-ghost {
  color: var(--ab-ink-secondary);
}

/* ── Prose ──────────────────────────────────────────────────── */
.page-prose {
  max-width: var(--measure-prose);
}

.page-prose p {
  margin: 0 0 1.125rem;
  font-size: 1.0312rem;
  line-height: var(--leading-relaxed);
  color: var(--ab-ink-secondary);
}

.page-prose p:last-child {
  margin-bottom: 0;
}

.page-prose h2 {
  margin: 2rem 0 0.75rem;
  font-size: var(--text-2xl);
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
  color: var(--ab-ink);
}

.page-prose h2:first-child {
  margin-top: 0;
}

.page-prose a {
  color: var(--ab-accent);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.page-prose a:hover {
  color: var(--color-terracotta-deep);
}

.page-prose ul {
  margin: 0 0 1.125rem;
  padding-left: 1.25rem;
}

.page-prose li {
  margin-bottom: 0.5rem;
  font-size: 1.0312rem;
  line-height: var(--leading-relaxed);
  color: var(--ab-ink-secondary);
}

.page-disclaimer {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--ab-border);
  font-size: var(--text-sm);
  color: var(--ab-ink-muted);
}

.page-disclaimer--spaced {
  margin-top: 2rem;
}

.page-back-wrap {
  margin-top: 2rem;
}

.page-note-spaced {
  margin-top: 1rem;
}

.page-inline-code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* ── MCP agent use case ─────────────────────────────────────── */
.page-mcp-eyebrow {
  margin: 0 0 0.75rem;
}

.page-mcp-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ab-border);
}

.page-mcp-step {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  gap: 1rem 1.25rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--ab-border);
  align-items: start;
}

@media (max-width: 560px) {
  .page-mcp-step {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

.page-mcp-step-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--ab-ink-muted);
  padding-top: 0.2rem;
}

.page-mcp-step-title {
  margin: 0 0 0.35rem;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--ab-ink);
}

.page-mcp-step p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--ab-ink-muted);
  max-width: 40rem;
}

.page-mcp-actions {
  margin-top: 1.75rem;
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ab-ink-muted);
}

/* ── Section headers ────────────────────────────────────────── */
.page-section-head {
  max-width: 40rem;
  margin-bottom: clamp(2rem, 4vw, 2.75rem);
}

.page-section-title {
  font-size: var(--text-3xl);
  font-weight: 500;
  letter-spacing: var(--tracking-display);
  color: var(--ab-ink);
  margin: 0;
}

.page-section-lead {
  margin-top: 0.75rem;
  font-size: 1.0312rem;
  line-height: 1.55;
  color: var(--ab-ink-secondary);
  max-width: 36rem;
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ab-ink-muted);
}

/* ── Hub grid (use cases) ───────────────────────────────────── */
.page-hub-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-border);
  border: 1px solid var(--ab-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

@media (max-width: 640px) {
  .page-hub-grid {
    grid-template-columns: 1fr;
  }
}

.page-hub-link {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: clamp(1.5rem, 3vw, 2rem);
  background: var(--ab-bg-raised);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s ease;
}

.page-hub-link:hover {
  background: var(--ab-bg-muted);
}

.page-hub-link-label {
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--ab-ink);
}

.page-hub-link-desc {
  font-size: var(--text-sm);
  line-height: 1.55;
  color: var(--ab-ink-secondary);
  max-width: 32ch;
}

.page-hub-link-arrow {
  margin-top: auto;
  padding-top: 0.75rem;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--ab-accent);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

/* ── Outcomes list (audience pages) ─────────────────────────── */
.page-outcomes-list {
  border-top: 1px solid var(--ab-border);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-outcome-item {
  display: grid;
  grid-template-columns: minmax(4.5rem, 1fr) minmax(0, 4fr);
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: baseline;
  padding: clamp(1.25rem, 2.5vw, 1.75rem) 0;
  border-bottom: 1px solid var(--ab-border);
}

@media (max-width: 640px) {
  .page-outcome-item {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

.page-outcome-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ab-accent);
}

.page-outcome-text {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ab-ink-secondary);
  margin: 0;
  max-width: 56ch;
}

/* ── Back link ──────────────────────────────────────────────── */
.page-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--ab-ink-secondary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.page-back-link:hover {
  color: var(--ab-accent);
}

/* ── Contact / B2B ──────────────────────────────────────────── */
.page-contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

@media (max-width: 768px) {
  .page-contact-grid {
    grid-template-columns: 1fr;
  }
}

.page-contact-card {
  background: var(--ab-bg-raised);
  border: 1px solid var(--ab-border);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 3vw, 2rem);
  box-shadow: var(--shadow-card);
}

.page-contact-email {
  display: block;
  margin-top: 0.5rem;
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--ab-ink);
  text-decoration: none;
}

.page-contact-email:hover {
  color: var(--ab-accent);
}

.page-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-form-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.page-form-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--ab-ink);
}

.page-form-input,
.page-form-textarea,
.page-form-select {
  width: 100%;
  padding: 0.75rem 0.875rem;
  font-family: inherit;
  font-size: var(--text-base);
  color: var(--ab-ink);
  background: var(--ab-bg);
  border: 1px solid var(--ab-border);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease;
}

.page-form-input:focus,
.page-form-textarea:focus,
.page-form-select:focus {
  outline: none;
  border-color: var(--ab-accent);
}

.page-form-textarea {
  min-height: 7rem;
  resize: vertical;
}

.page-form-note {
  font-size: var(--text-sm);
  color: var(--ab-ink-muted);
  margin: 0;
}

.page-form-note a {
  color: var(--ab-accent);
}

/* ── API docs ───────────────────────────────────────────────── */
.page-api-endpoint {
  padding: clamp(1.25rem, 2.5vw, 1.75rem) 0;
  border-bottom: 1px solid var(--ab-border);
}

.page-api-endpoint:first-child {
  border-top: 1px solid var(--ab-border);
}

.page-api-method {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ab-accent);
  margin-bottom: 0.5rem;
}

.page-api-path {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--ab-ink);
  word-break: break-all;
}

.page-api-desc {
  margin-top: 0.625rem;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--ab-ink-secondary);
  max-width: 60ch;
}

.page-code-block {
  margin-top: 1rem;
  padding: 1rem 1.125rem;
  background: var(--ab-bg-muted);
  border: 1px solid var(--ab-border);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--ab-ink-secondary);
  overflow-x: auto;
}

.page-inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  margin-top: 1.5rem;
}

.pricing-soon {
  display: inline-block;
  margin-left: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ab-accent);
}