/* PE Operator site — shared styles
 * World: the banner's charcoal ground with its three bolt colours.
 * Covers are the content; chrome stays quiet around them.
 */

@font-face {
  font-family: "Archivo";
  font-style: normal;
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
  src: url("fonts/archivo-latin-var.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Archivo";
  font-style: normal;
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
  src: url("fonts/archivo-latin-ext-var.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

:root {
  /* Colour: sampled from the banner art (Untitled.jpg) */
  --ground: #2d2e26;          /* banner charcoal */
  --ground-deep: #23241d;     /* footer, pressed */
  --surface: #383930;         /* inputs, raised rows */
  --surface-hi: #45463b;      /* hover on raised */
  --rule: #4f5045;            /* hairlines (decorative) */
  --rule-strong: #8a8b7c;     /* control borders, 3:1+ on ground */
  --text: #f3f1e7;            /* 12.1:1 on ground */
  --text-muted: #c4c2b2;      /* 7.6:1 on ground */
  --text-placeholder: #b3b1a0;/* 5.4:1 on surface */
  --bolt-yellow: #eeb937;     /* favourites, current, primary action */
  --bolt-yellow-hi: #f6cd5c;
  --on-yellow: #23241d;
  --bolt-blue: #1f5fa1;       /* banner blue (decorative only on dark) */
  --bolt-blue-lite: #8cb8ec;  /* focus + links, 6.7:1 on ground */
  --bolt-orange: #e56e1f;     /* hover energy, non-text */
  --bolt-orange-lite: #f08a45;

  /* Type */
  --font: "Archivo", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --step-display: clamp(2.5rem, 1.35rem + 4.6vw, 5.25rem);
  --step-page: clamp(2.25rem, 1.4rem + 3.4vw, 4.25rem);
  --step-section: clamp(1.75rem, 1.3rem + 1.6vw, 2.625rem);
  --step-category: clamp(1.3rem, 1.1rem + 0.7vw, 1.75rem);

  /* Space (4px base) */
  --s-1: 0.25rem; --s-2: 0.5rem; --s-3: 0.75rem; --s-4: 1rem; --s-5: 1.25rem;
  --s-6: 1.5rem; --s-8: 2rem; --s-10: 2.5rem; --s-12: 3rem; --s-16: 4rem; --s-20: 5rem;
  --gutter: clamp(1rem, 3.5vw, 2.5rem);
  --section-gap: clamp(3rem, 2rem + 4vw, 5.5rem);

  /* Shape + depth */
  --r-cover: 3px 6px 6px 3px;   /* bound edge left, fore-edge right */
  --r-control: 999px;
  --r-panel: 14px;
  --shadow-cover: 0 1px 2px rgb(0 0 0 / 0.45), 0 12px 24px -10px rgb(0 0 0 / 0.65);
  --shadow-cover-lift: 0 2px 4px rgb(0 0 0 / 0.4), 0 22px 36px -14px rgb(0 0 0 / 0.75);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  color-scheme: dark;
  background: var(--ground);
  -webkit-text-size-adjust: 100%;
  scrollbar-color: var(--surface-hi) var(--ground-deep);
  accent-color: var(--bolt-yellow);
}
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--ground);
  color: var(--text);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.5;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
h1, h2, h3, p { margin: 0; }
img { display: block; max-width: 100%; }
a { color: inherit; }
::selection { background: var(--bolt-yellow); color: var(--on-yellow); }
input { caret-color: var(--bolt-yellow); }
:focus-visible {
  outline: 3px solid var(--bolt-blue-lite);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap {
  width: 100%;
  max-width: 82rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: var(--s-4);
  top: -4rem;
  z-index: 100;
  padding: var(--s-3) var(--s-5);
  background: var(--bolt-yellow);
  color: var(--on-yellow);
  font-weight: 700;
  border-radius: var(--r-control);
  text-decoration: none;
}
.skip-link:focus { top: var(--s-3); }

svg { flex: none; }
.icon-bolt { width: 1.05em; height: 1.05em; }
.icon-search { width: 1.15rem; height: 1.15rem; }
.icon-arrow { width: 1.35rem; height: 1.35rem; }

/* ---------- Site nav ---------- */
.site-nav-inner {
  display: flex;
  align-items: center;
  gap: var(--s-1) var(--s-6);
  min-height: 3.5rem;
}
.site-nav a,
.category-nav a {
  font-stretch: 112%;
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
}
.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--text-muted);
  text-decoration-line: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.5em;
  transition: color 0.2s var(--ease-out), text-decoration-color 0.2s var(--ease-out);
}
.site-nav a:hover { color: var(--text); text-decoration-color: var(--rule-strong); }
.site-nav a.is-current { color: var(--bolt-yellow); text-decoration-color: var(--bolt-yellow); }

/* ---------- Masthead ---------- */
.masthead { padding-bottom: var(--s-2); }
.banner {
  /* Same charcoal as the art, so the banner reads as the page itself. */
  background: var(--ground);
  border-radius: var(--r-panel);
  overflow: hidden;
}
.banner img {
  width: 100%;
  height: clamp(5.5rem, 17vw, 14rem);
  object-fit: cover;
  object-position: left center;
}
.banner--strip img { height: clamp(4.5rem, 10vw, 7.5rem); object-position: left 36%; }

.masthead-grid {
  display: grid;
  gap: var(--s-8);
  padding-block: var(--s-8) var(--s-4);
}
@media (min-width: 960px) {
  .masthead-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
    gap: var(--s-12);
    padding-top: var(--s-8);
  }
}

.display {
  font-stretch: 72%;
  font-weight: 800;
  font-size: 3.5rem;
  font-size: var(--step-display);
  line-height: 0.94;
  letter-spacing: -0.02em;
  text-wrap: balance;
  max-width: 17ch;
}
.tagline {
  margin-top: var(--s-4);
  font-size: clamp(1.125rem, 1rem + 0.6vw, 1.5rem);
  line-height: 1.35;
  color: var(--text-muted);
  max-width: 34ch;
}
.display--page {
  font-size: 3rem;
  font-size: var(--step-page);
  max-width: 18ch;
  margin-top: var(--s-8);
}
.page-meta {
  margin-top: var(--s-3);
  margin-bottom: var(--s-6);
  color: var(--text-muted);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

.masthead-tools {
  display: grid;
  gap: var(--s-5);
  align-content: end;
}
.masthead-tools .filter-bar { justify-content: stretch; }
.masthead-tools .book-search-label { width: 100%; }
.masthead-tools .book-search { width: 100%; min-width: 0; height: 3.25rem; font-size: 1.0625rem; }

/* Follow links */
.social {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--s-5);
}
@media (min-width: 960px) {
  .masthead-grid { grid-template-areas: "copy tools" "social social"; row-gap: var(--s-4); }
  .masthead-copy { grid-area: copy; }
  .masthead-tools { grid-area: tools; }
  .masthead-grid > .social { grid-area: social; }
}
.social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  min-height: 2.75rem;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s var(--ease-out);
}
.social-link svg { width: 1.05rem; height: 1.05rem; color: var(--text-muted); transition: color 0.2s var(--ease-out); }
.social-link--substack svg { color: var(--bolt-orange-lite); }
.social-link--readwise svg { color: var(--bolt-blue-lite); }
.social-link:hover { color: var(--bolt-yellow); }
.social-link:hover svg { color: currentColor; }

/* ---------- Category cross-nav (category pages + View all) ---------- */
.category-nav {
  border-block: 1px solid var(--rule);
}
.category-nav-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  padding-block: var(--s-3);
}
.category-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.5rem;
  padding: 0 0.8rem;
  color: var(--text-muted);
  border: 1px solid var(--rule);
  border-radius: var(--r-control);
  white-space: nowrap;
  font-size: 0.75rem;
  transition: color 0.2s var(--ease-out), border-color 0.2s var(--ease-out), background-color 0.2s var(--ease-out);
}
.category-nav a:hover { color: var(--text); border-color: var(--rule-strong); }
.category-nav a { letter-spacing: 0.04em; font-stretch: 100%; }
.category-nav a.is-current {
  background: var(--bolt-yellow);
  border-color: var(--bolt-yellow);
  color: var(--on-yellow);
}
@media (max-width: 767px) {
  /* One swipeable row instead of four wrapped rows on phones */
  .category-nav-inner {
    flex-wrap: nowrap;
    overflow-x: auto;
    scroll-snap-type: x proximity;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    mask-image: linear-gradient(90deg, #000 85%, transparent);
    -webkit-mask-image: linear-gradient(90deg, #000 85%, transparent);
  }
  .category-nav-inner::-webkit-scrollbar { display: none; }
  .category-nav a { scroll-snap-align: start; }
}

/* ---------- Filter bar: All | Favorites + search ---------- */
.toolbar {
  padding: 1rem 0;
  border-bottom: 1px solid var(--rule);
  background: var(--ground);
}
@media (min-width: 640px) {
  /* Sticky tools on tablet/desktop; on phones the bar would eat ~15% of the screen. */
  .toolbar { position: sticky; top: 0; z-index: 20; padding: 0.75rem 0; }
}
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-3);
}
.toolbar .filter-bar { justify-content: space-between; }
.filter-toggles {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--r-control);
}
.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  min-height: 2.5rem;
  padding: 0 var(--s-5);
  border: 0;
  border-radius: var(--r-control);
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-weight: 700;
  font-size: 0.9375rem;
  cursor: pointer;
  transition: background-color 0.2s var(--ease-out), color 0.2s var(--ease-out);
}
.filter-btn .icon-bolt { color: var(--bolt-yellow); }
.filter-btn:hover { color: var(--text); background: var(--surface); }
.filter-btn.is-active { background: var(--bolt-yellow); color: var(--on-yellow); }
.filter-btn.is-active .icon-bolt { color: var(--on-yellow); }
.filter-btn.is-active:hover { background: var(--bolt-yellow-hi); }

.book-search-label {
  position: relative;
  display: inline-flex;
  align-items: center;
  flex: 1 1 14rem;
  max-width: 26rem;
}
.masthead-tools .book-search-label { max-width: none; }
.book-search-label .icon-search {
  position: absolute;
  left: 1rem;
  color: var(--text-muted);
  pointer-events: none;
}
.book-search {
  width: 100%;
  height: 2.875rem;
  padding: 0 1rem 0 2.75rem;
  border: 1px solid var(--rule-strong);
  border-radius: var(--r-control);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  font-weight: 500;
  outline: none;
  transition: border-color 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out), background-color 0.2s var(--ease-out);
}
.book-search::placeholder { color: var(--text-placeholder); font-weight: 450; opacity: 1; }
.book-search:hover { background: var(--surface-hi); }
.book-search:focus-visible,
.book-search:focus {
  border-color: var(--bolt-yellow);
  outline: 2px solid var(--bolt-yellow);
  outline-offset: 2px;
}
.book-search::-webkit-search-cancel-button { filter: invert(0.85); cursor: pointer; }

.filter-empty {
  display: none;
  padding: var(--s-12) 0;
  color: var(--text-muted);
  font-size: 1.125rem;
}
.filter-empty.is-visible { display: block; }

/* Hide cards that fail Favorites and/or search (JS toggles .is-filtered-out) */
[data-book-card].is-filtered-out { display: none !important; }

/*
 * Home search UX:
 * - Empty query: Rushmore → categories → Latest.
 * - Non-empty query: JS hides Rushmore/categories/Latest/CTA via [hidden] and shows
 *   #home-search-results (full catalog).
 */
#home-search-results[hidden],
#rushmore[hidden],
#categories[hidden],
#latest[hidden],
#home-view-all-cta[hidden] { display: none !important; }

/* ---------- Main + sections ---------- */
.main { flex: 1 0 auto; padding-bottom: var(--section-gap); }
.section { padding-top: var(--section-gap); }
.section-rushmore { padding-top: var(--s-12); }
.section-catalog { padding-top: var(--s-8); }
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s-2) var(--s-6);
  padding-bottom: var(--s-4);
  margin-bottom: var(--s-8);
  border-bottom: 1px solid var(--rule);
}
.section-title {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  font-stretch: 78%;
  font-weight: 800;
  font-size: 2.25rem;
  font-size: var(--step-section);
  line-height: 1;
  letter-spacing: -0.015em;
}
.section-title .icon-bolt { color: var(--bolt-yellow); width: 0.8em; height: 0.8em; }
.section-meta,
.category-count {
  font-stretch: 112%;
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}
.section-rushmore .section-head { border-bottom-color: var(--bolt-yellow); }
.section-foot {
  margin-top: var(--s-6);
  color: var(--text-muted);
}
.section-foot a,
.footer-credit a {
  color: var(--text);
  font-weight: 700;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  text-decoration-color: var(--bolt-yellow);
}
.section-foot a:hover,
.footer-credit a:hover { color: var(--bolt-yellow); }
.search-count {
  margin: calc(var(--s-4) * -1) 0 var(--s-8);
  color: var(--text-muted);
}

/* ---------- Book (cover-first card) ---------- */
.book { position: relative; min-width: 0; }
.book > a {
  display: block;
  text-decoration: none;
  color: inherit;
  border-radius: 6px;
}
.book > a:focus-visible { outline-offset: 6px; }
.book-cover-frame {
  position: relative;
  display: block;
  aspect-ratio: 2 / 3;
  border-radius: var(--r-cover);
  background: var(--surface);
  box-shadow: var(--shadow-cover);
  transition: transform 0.45s var(--ease-out), box-shadow 0.45s var(--ease-out);
}
/* A faint crease at the bound edge so covers read as books, not tiles. */
.book-cover-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, rgb(255 255 255 / 0.16) 0, rgb(0 0 0 / 0.18) 2.5%, transparent 6%);
  pointer-events: none;
}
.book-cover {
  width: 100%;
  height: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border-radius: inherit;
}
.book-meta {
  display: block;
  padding-top: var(--s-3);
}
.book-title {
  font-stretch: 94%;
  font-weight: 650;
  font-size: 1rem;
  line-height: 1.22;
  letter-spacing: -0.005em;
  overflow-wrap: anywhere;
  hyphens: auto;
  text-wrap: pretty;
  transition: color 0.2s var(--ease-out);
}
.book-author {
  margin-top: var(--s-1);
  font-size: 0.875rem;
  line-height: 1.35;
  color: var(--text-muted);
  overflow-wrap: anywhere;
}
@media (hover: hover) {
  .book > a:hover .book-cover-frame { transform: translateY(-5px); box-shadow: var(--shadow-cover-lift); }
  .book > a:hover .book-title { color: var(--bolt-yellow); }
}
.book > a:active .book-cover-frame { transform: translateY(-2px); }

/* Lightning badge = PE Operator favourite */
.bolt-badge {
  position: absolute;
  top: -0.55rem;
  right: -0.55rem;
  z-index: 2;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  overflow: hidden;
  background: var(--ground);
  box-shadow: 0 0 0 3px var(--ground), 0 4px 10px rgb(0 0 0 / 0.5);
}
.bolt-badge img { width: 100%; height: 100%; object-fit: cover; }

/* The one authored motion: badges strike when the Favorites filter turns on. */
@keyframes bolt-strike {
  0%   { transform: scale(0.55) rotate(-18deg); filter: brightness(1.9); }
  45%  { transform: scale(1.12) rotate(4deg); filter: brightness(1.25); }
  100% { transform: none; filter: none; }
}
body.filter-favorites .bolt-badge { animation: bolt-strike 0.6s var(--ease-out) both; }

/* ---------- Grids ---------- */
.book-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s-8) var(--s-5);
}
@media (min-width: 560px) {
  .book-grid { grid-template-columns: repeat(auto-fill, minmax(10rem, 1fr)); gap: var(--s-10) var(--s-6); }
}
@media (min-width: 1200px) {
  .book-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: var(--s-12) var(--s-8); }
}

/* Mt. Rushmore: four big covers */
.rushmore-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s-8) var(--s-5);
}
@media (min-width: 768px) {
  .rushmore-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--s-8) clamp(1.5rem, 3vw, 3rem); }
}
.book--rushmore .book-title { font-size: clamp(1.05rem, 0.95rem + 0.5vw, 1.375rem); font-stretch: 86%; font-weight: 700; }
.book--rushmore .book-author { font-size: 0.9375rem; }
.book--rushmore .bolt-badge { width: clamp(2.25rem, 1.8rem + 1.2vw, 3rem); height: clamp(2.25rem, 1.8rem + 1.2vw, 3rem); }

/* Latest additions: 5-up on wide screens, swipeable rail on phones */
@media (min-width: 900px) {
  .latest-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
}
@media (max-width: 639px) {
  .latest-grid {
    grid-template-columns: none;
    grid-auto-flow: column;
    grid-auto-columns: 42%;
    gap: var(--s-5);
    overflow-x: auto;
    overscroll-behavior-x: contain;
    scroll-snap-type: x mandatory;
    scroll-padding-inline: var(--gutter);
    margin-inline: calc(var(--gutter) * -1);
    padding: var(--s-3) var(--gutter) var(--s-4);
    scrollbar-width: thin;
  }
  .latest-grid > .book { scroll-snap-align: start; }
}

/* ---------- Category index (home) ---------- */
.category-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}
@media (min-width: 768px) {
  .category-index { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: var(--s-10); }
}
.category-index > li { border-bottom: 1px solid var(--rule); }
.category-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "name arrow"
    "blurb arrow"
    "count arrow";
  align-items: center;
  column-gap: var(--s-4);
  padding: var(--s-5) var(--s-2) var(--s-5) 0;
  text-decoration: none;
  color: inherit;
  border-radius: 6px;
}
.category-name {
  grid-area: name;
  font-stretch: 82%;
  font-weight: 750;
  font-size: 1.5rem;
  font-size: var(--step-category);
  line-height: 1.1;
  letter-spacing: -0.01em;
  transition: color 0.2s var(--ease-out);
}
.category-blurb { grid-area: blurb; margin-top: var(--s-1); color: var(--text-muted); }
.category-count { grid-area: count; margin-top: var(--s-2); }
.category-card .icon-arrow {
  grid-area: arrow;
  color: var(--text-muted);
  transition: transform 0.35s var(--ease-out), color 0.2s var(--ease-out);
}
.category-card:hover .category-name { color: var(--bolt-yellow); }
.category-card:hover .icon-arrow { color: var(--bolt-orange-lite); transform: translateX(4px); }
.section-categories .section-head { margin-bottom: 0; }

/* ---------- CTA ---------- */
.section-cta { padding-top: var(--section-gap); }
.btn-outline {
  display: inline-flex;
  align-items: center;
  min-height: 3rem;
  padding: 0 var(--s-6);
  border: 2px solid var(--bolt-yellow);
  border-radius: var(--r-control);
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
  transition: background-color 0.2s var(--ease-out), color 0.2s var(--ease-out);
}
.btn-outline:hover { background: var(--bolt-yellow); color: var(--on-yellow); }

/* ---------- Footer ---------- */
.site-footer {
  margin-top: auto;
  background: var(--ground-deep);
  border-top: 1px solid var(--rule);
}
.site-footer-inner {
  display: grid;
  gap: var(--s-8);
  padding-block: var(--s-12) var(--s-10);
}
@media (min-width: 768px) {
  .site-footer-inner { grid-template-columns: auto minmax(0, 1fr); align-items: end; column-gap: var(--s-16); }
  .footer-fine { justify-self: end; text-align: right; }
}
.x-recommend-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  min-height: 3.25rem;
  padding: 0 var(--s-6);
  border-radius: var(--r-control);
  background: var(--bolt-yellow);
  color: var(--on-yellow);
  font-weight: 750;
  font-size: 1.0625rem;
  text-decoration: none;
  box-shadow: 0 8px 18px -10px rgb(0 0 0 / 0.7);
  transition: background-color 0.2s var(--ease-out), transform 0.3s var(--ease-out);
}
.x-recommend-btn svg { width: 1.15rem; height: 1.15rem; }
.x-recommend-btn:hover { background: var(--bolt-yellow-hi); transform: translateY(-1px); }
.x-recommend-btn:focus-visible { outline: 3px solid var(--bolt-blue-lite); outline-offset: 3px; }
.footer-note { margin-top: var(--s-3); font-size: 0.9375rem; color: var(--text-muted); }
.footer-fine { display: grid; gap: var(--s-3); max-width: 38rem; }
.footer-disclosure { font-size: 0.875rem; line-height: 1.5; color: var(--text-muted); }
.footer-credit { font-size: 0.9375rem; color: var(--text); }

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  .book-cover-frame,
  .category-card .icon-arrow,
  .x-recommend-btn { transition: none; }
  .book > a:hover .book-cover-frame { transform: none; }
  body.filter-favorites .bolt-badge { animation: none; }
}