/* ===== EBOOK PROMOTION — NATIVE EDITORIAL TREATMENTS =====
   Promotion for "How to Remain Valuable When Intelligence Becomes Cheap".
   No new palette, no gradients, no glow: hairline rules, the existing type
   scale, and the single amber accent carry every variant. One file owns all
   ebook styles so frequency and tone stay reviewable in one place. */

:root {
  --ebook-notice-h: 41px;
}

/* ---- Slim announcement strip (inside the fixed navbar wrap) ---- */
.ui-navbar-wrap:has(.ebook-notice:not([hidden])) {
  height: auto;
}

body:has(.ebook-notice:not([hidden])) .ui-main,
body:has(.ebook-notice:not([hidden])) .ui-landing-main {
  padding-top: calc(var(--navbar-height) + var(--space-12) + var(--ebook-notice-h));
}

.ebook-notice {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
}

.ebook-notice-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4) 0 var(--space-8);
  min-height: 40px;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  line-height: 1.4;
}

.ebook-notice-marker {
  flex-shrink: 0;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.ebook-notice-text {
  min-width: 0;
  flex: 1 1 auto;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--color-ink-slate);
}

.ebook-notice-text strong {
  font-weight: 500;
  color: var(--color-ink-body);
}

.ebook-notice-cta {
  flex-shrink: 0;
  color: var(--color-ink-body);
  text-decoration: underline;
  text-underline-offset: 3px;
  white-space: nowrap;
}

.ebook-notice-cta:hover {
  color: var(--color-accent-hover);
}

.ebook-notice-short {
  display: none;
}

.ebook-notice-dismiss {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-size: 1.25rem;
  line-height: 1;
  color: var(--color-ink-slate);
  transition: color var(--transition-fast);
}

.ebook-notice-dismiss:hover {
  color: var(--color-ink-body);
}

@media (max-width: 640px) {
  .ebook-notice-inner {
    padding-left: var(--space-4);
  }

  .ebook-notice-full {
    display: none;
  }

  .ebook-notice-short {
    display: inline;
  }
}

/* The base layout drops to space-8 top padding at 768px; the compensation
   follows so dismissed and shown states keep identical rhythm. */
@media (max-width: 768px) {
  body:has(.ebook-notice:not([hidden])) .ui-main,
  body:has(.ebook-notice:not([hidden])) .ui-landing-main {
    padding-top: calc(var(--navbar-height) + var(--space-8) + var(--ebook-notice-h));
  }
}

/* ---- Homepage feature: editorial two-column, like the study section ---- */
.ebook-feature-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: var(--space-8);
  align-items: start;
  margin-top: var(--space-6);
}

.ebook-feature-lede {
  font-size: var(--text-lg);
  line-height: 1.65;
  color: var(--color-ink-body);
  max-width: var(--measure-lede);
}

.ebook-feature-points {
  list-style: none;
  margin: var(--space-5) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-slate);
  line-height: 1.6;
}

.ebook-feature-points li {
  padding-left: var(--space-5);
  position: relative;
}

.ebook-feature-points li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

.ebook-feature-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-3) var(--space-5);
  margin-top: var(--space-6);
}

.ebook-feature-meta {
  font-size: var(--text-xs);
  color: var(--color-ink-slate);
  letter-spacing: 0.04em;
}

.ebook-feature-figure {
  margin: 0;
}

.ebook-feature-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--figure-border);
  background: var(--color-bg-elevated);
}

.ebook-feature-figure figcaption {
  font-size: var(--text-xs);
  color: var(--color-ink-slate);
  margin-top: var(--space-2);
  line-height: 1.5;
}

@media (max-width: 800px) {
  .ebook-feature-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .ebook-feature-figure {
    max-width: 220px;
  }
}

/* ---- Ruled aside: end-of-article and section-level placements ----
   A document interruption, not a card: hairlines above and below, no
   background, no radius. Reads as part of the page. */
.ebook-aside {
  border-top: 1px solid var(--color-border-strong);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-6) 0;
  max-width: var(--measure-prose);
}

.ebook-aside-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--color-ink-body);
  margin: 0 0 var(--space-3);
  max-width: 30ch;
}

.ebook-aside-text {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-body);
  margin: 0;
}

.ebook-aside-cta {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-ink-slate);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.ebook-aside-cta:hover {
  color: var(--color-accent-hover);
}

/* ---- Quiet single-line placements (indexes, states, guides) ---- */
.ebook-line {
  margin: var(--space-8) 0 0;
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-slate);
  max-width: var(--measure-prose);
}

.ebook-line--plain {
  border-top: 0;
  margin-top: var(--space-4);
  padding-top: 0;
}

.ebook-line a {
  color: var(--color-ink-body);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.ebook-line a:hover {
  color: var(--color-accent-hover);
}

.ebook-line strong {
  font-weight: 500;
  color: var(--color-ink-body);
}