/* App chrome for the book companion. Colors, type, and rhythm come from the shared
   design tokens; this file only lays things out. */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--kf-bg);
  color: var(--kf-ink);
  font-family: var(--kf-font);
  -webkit-font-smoothing: antialiased;
}

.kf-page {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 24px 72px;
}

a {
  color: var(--kf-consumer-stroke);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Hero and disclaimer */

.kf-hero {
  margin-bottom: 36px;
}

.kf-hero-title {
  margin: 0 0 8px;
  font-size: 32px;
  letter-spacing: -0.02em;
}

.kf-hero-sub {
  margin: 0 0 16px;
  max-width: 60ch;
  color: var(--kf-muted);
  font-size: var(--kf-fs-title);
  line-height: 1.5;
}

.kf-disclaimer {
  margin: 0;
  max-width: 70ch;
  padding: 12px 14px;
  background: var(--kf-surface);
  border: 1px solid var(--kf-grid);
  border-radius: var(--kf-radius-sm);
  color: var(--kf-muted);
  font-size: 12px;
  line-height: 1.6;
}

/* Contents */

.kf-contents {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.kf-chapter {
  background: var(--kf-surface);
  border: 1px solid var(--kf-grid);
  border-radius: var(--kf-radius);
  padding: 16px 18px;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.04),
    0 10px 30px rgba(0, 0, 0, 0.45);
}

.kf-chapter.is-planned {
  box-shadow: none;
  opacity: 0.62;
}

.kf-chapter-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.kf-chapter-no {
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--kf-broker-stroke);
}

.kf-chapter-title {
  margin: 0;
  font-size: var(--kf-fs-title);
  letter-spacing: -0.01em;
}

.kf-planned {
  margin: 8px 0 0;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--kf-muted);
}

.kf-anim-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.kf-anim-link {
  display: block;
  padding: 12px 14px;
  background: var(--kf-bg);
  border: 1px solid var(--kf-grid);
  border-radius: var(--kf-radius-sm);
  color: var(--kf-ink);
  transition:
    border-color 120ms var(--kf-ease),
    transform 120ms var(--kf-ease);
}

.kf-anim-link:hover {
  text-decoration: none;
  border-color: var(--kf-consumer);
  transform: translateY(-1px);
}

.kf-anim-link-title {
  display: block;
  font-size: var(--kf-fs-label);
  font-weight: 600;
}

.kf-anim-link-desc {
  display: block;
  margin-top: 2px;
  color: var(--kf-muted);
  font-size: 13px;
  line-height: 1.5;
}

/* Focus */

.kf-focus {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.kf-back {
  align-self: flex-start;
  font-size: var(--kf-fs-label);
}

.kf-chapter-ref {
  margin: 0;
  color: var(--kf-muted);
  font-size: var(--kf-fs-label);
}

.kf-focus-title {
  margin: 0;
  font-size: 26px;
  letter-spacing: -0.01em;
}

.kf-focus-desc {
  margin: 0;
  max-width: 70ch;
  color: var(--kf-ink);
  font-size: var(--kf-fs-title);
  line-height: 1.55;
}

.kf-objective {
  margin: 0;
  max-width: 70ch;
  color: var(--kf-muted);
  font-size: var(--kf-fs-label);
  line-height: 1.55;
}

.kf-objective strong {
  color: var(--kf-leader);
}

.kf-stage {
  background: var(--kf-bg);
  border: 1px solid var(--kf-grid);
  border-radius: var(--kf-radius-sm);
  padding: 12px;
  overflow: hidden;
}

.kf-anim-svg {
  display: block;
  width: 100%;
  height: auto;
  border: 0;
}

.kf-controls {
  display: flex;
  gap: 8px;
}

.kf-btn {
  appearance: none;
  border: 1px solid var(--kf-grid);
  background: var(--kf-surface);
  color: var(--kf-ink);
  font: inherit;
  font-size: var(--kf-fs-label);
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition:
    border-color 120ms var(--kf-ease),
    transform 120ms var(--kf-ease);
}

.kf-btn:hover {
  border-color: var(--kf-consumer);
}

.kf-btn:active {
  transform: translateY(1px);
}

/* Prev / next */

.kf-booknav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 8px;
}

.kf-nav-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 14px;
  background: var(--kf-surface);
  border: 1px solid var(--kf-grid);
  border-radius: var(--kf-radius-sm);
  color: var(--kf-ink);
}

.kf-nav-link:hover {
  text-decoration: none;
  border-color: var(--kf-consumer);
}

.kf-nav-next {
  text-align: right;
}

.kf-nav-link[aria-disabled='true'] {
  opacity: 0.4;
  pointer-events: none;
}

.kf-nav-dir {
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--kf-muted);
}

.kf-nav-name {
  font-size: var(--kf-fs-label);
  font-weight: 600;
}

.kf-notice {
  background: var(--kf-surface);
  border: 1px solid var(--kf-grid);
  border-radius: var(--kf-radius);
  padding: 24px;
  text-align: center;
}

.kf-footer {
  margin-top: 48px;
  color: var(--kf-muted);
  font-size: 12px;
}

.kf-copyright {
  display: block;
  margin-top: 6px;
}