/* ═══════════════════════════════════════════════════════════════════════════
   John Boyd's Library — Design System
   Dark editorial aesthetic
   ═══════════════════════════════════════════════════════════════════════════ */

/* ─── Custom Properties ───────────────────────────────────────────────────── */
:root {
  --bg:            #0d0d0d;
  --surface:       #161616;
  --surface-2:     #1e1e1e;
  --border:        #2a2a2a;
  --text:          #e8e2d4;
  --muted:         #8a8278;
  --subtle:        #5a5650;
  --accent:        #c9a84c;
  --accent-dim:    #7a6530;
  --accent-glow:   rgba(201,168,76,0.15);

  --branch-war:    #8b1a1a;
  --branch-science:#1a4a8b;
  --branch-mind:   #2d6e4e;
  --branch-power:  #6b3d8b;

  --font-serif: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-sans:  'Inter', system-ui, -apple-system, sans-serif;

  --scale-xs:   0.707rem;
  --scale-sm:   0.866rem;
  --scale-base: 1rem;
  --scale-md:   1.25rem;
  --scale-lg:   1.414rem;
  --scale-xl:   1.999rem;
  --scale-2xl:  2.827rem;
  --scale-3xl:  4rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  --transition: 0.25s ease;
  --shadow: 0 4px 24px rgba(0,0,0,0.6);
}

/* ─── Light Mode ──────────────────────────────────────────────────────────── */
html[data-theme="light"] {
  --bg:          #f4efe4;
  --surface:     #ebe5d8;
  --surface-2:   #e2dccf;
  --border:      #cdc6b5;
  --text:        #1c1814;
  --muted:       #4a4540;
  --subtle:      #8a8278;
  --accent:      #8b6914;
  --accent-dim:  #6b5010;
  --accent-glow: rgba(139,105,20,0.12);
  --shadow:      0 4px 24px rgba(0,0,0,0.12);
}

html[data-theme="light"] #site-nav {
  background: rgba(244,239,228,0.92);
}

html[data-theme="light"] .controls-bar {
  background: rgba(244,239,228,0.96);
}

html[data-theme="light"] .hero-vignette {
  background:
    linear-gradient(to bottom, rgba(244,239,228,0.15) 0%, transparent 25%),
    linear-gradient(to right, rgba(244,239,228,0.65) 0%, transparent 55%);
}

html[data-theme="light"] #nav-menu {
  background: var(--surface);
}

html[data-theme="light"] .hero-title,
html[data-theme="light"] .hero-subtitle,
html[data-theme="light"] .hero-meta,
html[data-theme="light"] .hero-meta span {
  text-shadow: none;
}

/* ─── Reset & Base ────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  line-height: 1.2;
  font-weight: 700;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

button {
  cursor: pointer;
  font-family: var(--font-sans);
  border: none;
  background: none;
}

img, video { max-width: 100%; display: block; }

/* ─── Progress Bar ────────────────────────────────────────────────────────── */
#progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: var(--accent);
  z-index: 1000;
  transition: width 0.1s linear;
  box-shadow: 0 0 8px var(--accent);
}

/* ─── Navigation ──────────────────────────────────────────────────────────── */
#site-nav {
  position: fixed;
  top: 3px; left: 0; right: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0.75rem 2rem;
  background: rgba(13,13,13,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

#nav-menu {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  align-items: center;
}

.nav-link {
  color: var(--muted);
  font-size: var(--scale-sm);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--text);
  text-decoration: none;
}

.nav-link.active { color: var(--accent); }

#nav-toggle {
  display: none;
  color: var(--text);
  font-size: 1.5rem;
  padding: 0.25rem;
}

#theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 1rem;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 1rem;
  margin-right: 3rem;
  transition: color var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

#theme-toggle:hover {
  color: var(--text);
  border-color: var(--subtle);
}

/* ─── Hero Section ────────────────────────────────────────────────────────── */
#hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  display: flex;
  flex-direction: row;
  overflow: hidden;
}

/* Left column — Boyd photo / mosaic animation */
.hero-image-col {
  position: relative;
  flex: 0 0 58%;
  overflow: hidden;
}

/* Right column — title text, always structurally separate from image */
.hero-text-col {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6rem 3.5rem 3rem 3rem;
  background: var(--bg);
  position: relative;
  z-index: 5;
}

/* Mobile: stack vertically */
@media (max-width: 768px) {
  #hero {
    flex-direction: column;
  }
  .hero-image-col {
    flex: 0 0 52vh;
    min-height: 52vh;
  }
  .hero-text-col {
    flex: 1;
    padding: 2.5rem 1.5rem 2rem;
    justify-content: flex-start;
  }
}

/* ── Mosaic tile grid ─────────────────────────────────────────────────────── */
#mosaic-grid {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 0;
  z-index: 0;
}

.mosaic-tile {
  overflow: hidden;
  perspective: 1000px;
  margin: -0.5px;
}

.tile-inner {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.56s cubic-bezier(0.5, 0, 0.15, 1);
}

.mosaic-tile.no-transition .tile-inner {
  transition: none;
}

.mosaic-tile.flipped .tile-inner {
  transform: rotateY(180deg);
}

.tile-front,
.tile-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background-size: cover;
  background-position: center;
  background-color: var(--surface);
}

.tile-back {
  transform: rotateY(180deg);
}

#skip-anim {
  position: absolute;
  top: 4.5rem;
  right: 1.5rem;
  z-index: 20;
  background: transparent;
  border: 1px solid var(--subtle);
  color: var(--subtle);
  font-size: var(--scale-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), opacity 0.4s ease;
}

#skip-anim:hover {
  color: var(--muted);
  border-color: var(--muted);
}
}




.hero-vignette {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(to bottom, rgba(0,0,0,0.35) 0%, transparent 25%),
    linear-gradient(to right, transparent 55%, var(--bg) 100%);
  pointer-events: none;
}

html[data-theme="light"] .hero-vignette {
  background:
    linear-gradient(to bottom, rgba(244,239,228,0.15) 0%, transparent 25%),
    linear-gradient(to right, transparent 55%, var(--bg) 100%);
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: left;
  opacity: 0;
  transition: opacity 0.9s ease;
}

.hero-content.visible {
  opacity: 1;
}

.hero-eyebrow {
  font-family: var(--font-sans);
  font-size: var(--scale-sm);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.title-initial {
  font-size: 1.45em;
  line-height: 1;
}

.hero-title {
  font-size: clamp(2.6rem, 4.5vw, 4.2rem);
  color: var(--text);
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}

.hero-subtitle {
  font-size: var(--scale-md);
  color: var(--muted);
  font-style: italic;
  margin: 0 0 2rem;
}

.hero-meta {
  font-size: var(--scale-sm);
  color: var(--muted);
  letter-spacing: 0.05em;
}

.hero-meta span { color: var(--accent); }

/* Scroll cue */
#scroll-cue {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: opacity var(--transition);
}

#scroll-cue.hidden { opacity: 0; pointer-events: none; }

#scroll-cue span {
  font-size: var(--scale-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(45deg);
  animation: bounce 1.8s infinite;
}

@keyframes bounce {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50%       { transform: rotate(45deg) translateY(6px); }
}

/* ─── Section Base ────────────────────────────────────────────────────────── */
.section {
  padding: 6rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-full { max-width: none; padding: 6rem 0; }

.section-label {
  font-size: var(--scale-sm);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: var(--scale-2xl);
  margin-bottom: 1rem;
  color: var(--text);
}

.section-intro {
  font-size: var(--scale-md);
  color: var(--muted);
  max-width: 700px;
  line-height: 1.7;
  margin-bottom: 3rem;
}

/* ─── Intro / Context Section ─────────────────────────────────────────────── */
#section-intro {
  background: var(--surface);
  border-top: 1px solid var(--border);
}

#section-intro .section { padding-top: 5rem; padding-bottom: 5rem; }

.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-top: 3rem;
}

.intro-portrait {
  position: relative;
}

.intro-portrait img {
  width: 100%;
  max-width: 380px;
  border-radius: var(--radius-md);
  filter: grayscale(20%) contrast(1.1);
  box-shadow: var(--shadow);
}

.intro-portrait-caption {
  margin-top: 0.75rem;
  font-size: var(--scale-sm);
  color: var(--muted);
  font-style: italic;
}

.intro-text h2 {
  font-size: var(--scale-xl);
  margin-bottom: 1rem;
}

.intro-text p {
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.stats-row {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.stat-item { text-align: left; }

.stat-number {
  font-family: var(--font-serif);
  font-size: var(--scale-xl);
  color: var(--accent);
  display: block;
}

.stat-label {
  font-size: var(--scale-sm);
  color: var(--muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ─── Rankings Section ────────────────────────────────────────────────────── */
#section-rankings {
  background: var(--bg);
  border-top: 1px solid var(--border);
  overflow-anchor: none;
}

#rankings-list, #rankings-list * {
  overflow-anchor: none;
}

/* Sticky controls bar */
.controls-bar {
  position: sticky;
  top: 48px;
  z-index: 200;
  background: rgba(13,13,13,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0.875rem 2rem;
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.controls-left {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex: 1;
  min-width: 0;
}

.controls-right {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-shrink: 0;
}

.search-wrap {
  position: relative;
  flex: 1;
  max-width: 280px;
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
  font-size: 0.9em;
}

#search-input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--scale-sm);
  padding: 0.4rem 0.75rem 0.4rem 2.2rem;
  transition: border-color var(--transition);
}

#search-input::placeholder { color: var(--subtle); }
#search-input:focus { outline: none; border-color: var(--accent-dim); }

#sort-select {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--scale-sm);
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  transition: border-color var(--transition);
}

#sort-select:focus { outline: none; border-color: var(--accent-dim); }
#sort-select option { background: var(--surface-2); }

#sort-dir-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: var(--scale-sm);
  padding: 0.4rem 0.6rem;
  transition: all var(--transition);
}

#sort-dir-btn:hover { border-color: var(--accent-dim); color: var(--accent); }

#clear-filters {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: var(--scale-sm);
  padding: 0.4rem 0.75rem;
  transition: all var(--transition);
}

#clear-filters:hover { color: var(--text); border-color: var(--subtle); }

/* Filter chips */
.filter-chips {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0.5rem 2rem;
}

.filter-chip {
  padding: 0.3rem 0.875rem;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-size: var(--scale-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.filter-chip:hover { color: var(--text); border-color: var(--subtle); }

.filter-chip[data-branch="war"].active    { background: var(--branch-war);    border-color: var(--branch-war);    color: #fff; }
.filter-chip[data-branch="science"].active{ background: var(--branch-science); border-color: var(--branch-science); color: #fff; }
.filter-chip[data-branch="mind"].active   { background: var(--branch-mind);   border-color: var(--branch-mind);   color: #fff; }
.filter-chip[data-branch="power"].active  { background: var(--branch-power);  border-color: var(--branch-power);  color: #fff; }

/* Rankings list */
#rankings-count {
  font-size: var(--scale-sm);
  color: var(--muted);
  padding: 0 2rem 0.5rem;
}

#rankings-list {
  list-style: none;
  padding: 0 2rem;
  min-height: 60vh;
}

.rank-row {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
  border-radius: var(--radius-sm);
}

.rank-row:hover { background: var(--surface); padding-left: 0.5rem; padding-right: 0.5rem; }
.rank-row.pinned { background: rgba(201,168,76,0.05); }

.rank-num {
  width: 2.5rem;
  flex-shrink: 0;
  text-align: right;
  font-family: var(--font-serif);
  font-size: var(--scale-sm);
  color: var(--muted);
}

.cat-chip {
  flex-shrink: 0;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  border: 1px solid currentColor;
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  max-width: 110px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rank-info {
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.rank-title {
  display: block;
  font-family: var(--font-serif);
  font-size: var(--scale-base);
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  text-decoration: none;
  transition: color var(--transition);
}

.rank-title:hover {
  color: var(--accent);
  text-decoration: none;
}

.bf-hint {
  display: inline-block;
  margin-left: 0.5em;
  font-family: var(--font-sans);
  font-size: 0.72em;
  font-weight: 500;
  color: var(--accent);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
  pointer-events: none;
}

.rank-title:hover .bf-hint {
  opacity: 0.75;
  transform: translateX(0);
}

.rank-author {
  display: block;
  font-size: var(--scale-sm);
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.year-pill {
  flex-shrink: 0;
  font-size: var(--scale-xs);
  color: var(--subtle);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.1rem 0.4rem;
  white-space: nowrap;
}

.stars { color: var(--accent-dim); font-size: 0.85rem; white-space: nowrap; flex-shrink: 0; }
.star.full  { color: var(--accent); }
.star.half  { color: var(--accent); opacity: 0.6; }
.star.empty { color: var(--border); }

.rating-bar-wrap {
  width: 80px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.rating-bar {
  height: 4px;
  border-radius: 2px;
  background: var(--accent);
  flex: 1;
}

.rating-val {
  font-size: var(--scale-xs);
  color: var(--muted);
  white-space: nowrap;
}
.rating-val.not-reviewed {
  font-style: italic;
  opacity: 0.5;
}

.rank-actions {
  display: flex;
  gap: 0.3rem;
  flex-shrink: 0;
}

.pin-btn {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--muted);
  background: transparent;
  border: 1px solid transparent;
  transition: all var(--transition);
  opacity: 0;
  padding: 0;
  flex-shrink: 0;
}

.rank-row:hover .pin-btn { opacity: 1; }

.pin-btn:hover {
  background: var(--surface-2);
  border-color: var(--border);
  color: var(--accent);
}

.no-results {
  padding: 3rem;
  text-align: center;
  color: var(--muted);
  font-style: italic;
}

.no-results button {
  margin-top: 1rem;
  color: var(--accent);
  border-bottom: 1px solid var(--accent-dim);
  padding-bottom: 1px;
}

/* ─── Tree Section ────────────────────────────────────────────────────────── */
#section-tree {
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.tree-container {
  position: relative;
  padding: 0 2rem;
}

.tree-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.tree-hint {
  font-size: var(--scale-sm);
  color: var(--muted);
  font-style: italic;
}

.tree-legend {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-left: auto;
}

.legend-row {
  display: flex;
  gap: 1.25rem;
  align-items: center;
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--scale-xs);
  color: var(--muted);
  letter-spacing: 0.03em;
  white-space: nowrap;
}

#tree-reset {
  padding: 0.4rem 1rem;
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-size: var(--scale-sm);
  transition: all var(--transition);
}

#tree-reset:hover {
  background: var(--accent-glow);
  border-color: var(--accent);
}

#tree-wrapper {
  overflow: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  min-height: 700px;
}

.tree-svg { display: block; }

/* D3 Tree elements */
.tree-link {
  fill: none;
  stroke: var(--border);
  stroke-width: 1.5px;
  stroke-opacity: 0.6;
}

.tree-link-speculative {
  stroke: var(--accent-dim);
  stroke-width: 1px;
  stroke-dasharray: 5, 3;
  stroke-opacity: 0.5;
}

.node-label {
  font-family: var(--font-sans);
  fill: var(--muted);
  pointer-events: none;
}

.node-circle {
  transition: r 0.2s ease, fill 0.2s ease;
}

.tree-node:hover .node-circle { opacity: 0.85; }
.tree-node.node-book .node-label { font-size: 9px; }


/* ─── Narrative Scroll Sections ───────────────────────────────────────────── */
.narrative-section {
  border-top: 1px solid var(--border);
}

.narrative-section:nth-child(even) { background: var(--surface); }

.branch-header {
  padding: 5rem 2rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.branch-tag {
  display: inline-block;
  padding: 0.3rem 0.875rem;
  border-radius: 20px;
  font-size: var(--scale-sm);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  border: 1px solid currentColor;
}

.branch-title {
  font-size: var(--scale-2xl);
  margin-bottom: 0.5rem;
}

.branch-tagline {
  font-style: italic;
  color: var(--muted);
  font-size: var(--scale-md);
  margin-bottom: 1.5rem;
}

.branch-narrative {
  font-size: var(--scale-base);
  color: var(--muted);
  max-width: 700px;
  line-height: 1.85;
}

/* ─── Category section within narrative ──────────────────────────────────── */
.cat-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem 3rem;
}

.cat-section-header {
  padding: 2.5rem 0 1.25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.cat-section-title {
  font-family: var(--font-serif);
  font-size: var(--scale-lg);
  color: var(--text);
  flex-shrink: 0;
}

.cat-section-desc {
  font-size: var(--scale-sm);
  color: var(--muted);
  line-height: 1.7;
  max-width: 600px;
  flex: 1;
  min-width: 200px;
}

.cat-section .card-grid {
  padding: 0;
  margin: 0;
  max-width: none;
}

/* Card grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
  padding: 0 2rem 4rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* ─── Book Card ───────────────────────────────────────────────────────────── */
.book-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition), opacity 0.4s ease, translate 0.4s ease;
  opacity: 0;
  translate: 0 20px;
}

.book-card.visible {
  opacity: 1;
  translate: 0 0;
}

.book-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  border-color: var(--subtle);
}

.card-cover {
  position: relative;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

.card-initials {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  opacity: 0.8;
  position: relative;
  z-index: 1;
  transition: opacity 0.4s ease;
}

.card-initials.faded { opacity: 0; }

.card-cover-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  opacity: 0;
  transition: opacity 0.5s ease;
  z-index: 2;
}

.card-cover-img.loaded { opacity: 1; }

.card-body {
  padding: 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.card-meta-top {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.card-category {
  font-size: var(--scale-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
}

.card-year {
  font-size: var(--scale-xs);
  color: var(--subtle);
  margin-left: auto;
}

.card-title {
  display: block;
  font-family: var(--font-serif);
  font-size: var(--scale-md);
  color: var(--text);
  line-height: 1.3;
  margin-top: 0.2rem;
  text-decoration: none;
  transition: color var(--transition);
}

.card-title:hover {
  color: var(--accent);
  text-decoration: none;
}

.card-author {
  font-size: var(--scale-sm);
  color: var(--muted);
  font-style: italic;
}

.card-stars {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  color: var(--accent-dim);
  margin-top: 0.25rem;
}

.card-stars .star.full  { color: var(--accent); }
.card-stars .star.half  { color: var(--accent); opacity: 0.6; }
.card-stars .star.empty { color: var(--border); }

.card-rating {
  font-size: var(--scale-sm);
  color: var(--muted);
}

.card-desc {
  font-size: var(--scale-sm);
  color: var(--muted);
  line-height: 1.6;
  margin-top: 0.4rem;
  flex: 1;
}

/* ─── Speculative Section ─────────────────────────────────────────────────── */
#section-speculative {
  background: var(--surface);
  border-top: 3px solid var(--accent-dim);
}

.year-divider {
  text-align: center;
  padding: 4rem 2rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.year-divider-line {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.year-divider-line::before,
.year-divider-line::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--accent-dim);
}

.year-divider-badge {
  font-family: var(--font-serif);
  font-size: var(--scale-lg);
  color: var(--accent);
  white-space: nowrap;
  padding: 0.25rem 1rem;
  border: 1px solid var(--accent-dim);
  border-radius: 3px;
}

.year-divider-text {
  font-size: var(--scale-base);
  color: var(--muted);
  max-width: 650px;
  margin: 0 auto;
  line-height: 1.8;
  font-style: italic;
}

.speculative-card {
  border-color: var(--accent-dim);
  position: relative;
}

.speculative-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-md);
  box-shadow: inset 0 0 0 1px rgba(201,168,76,0.1);
  pointer-events: none;
}

.speculative-pill {
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: rgba(201,168,76,0.15);
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 3px;
  padding: 0.1rem 0.4rem;
}

.connection-badge {
  margin-top: 0.75rem;
  padding: 0.5rem 0.625rem;
  background: rgba(201,168,76,0.06);
  border-left: 2px solid var(--accent-dim);
  font-size: var(--scale-xs);
  color: var(--muted);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.5;
}

.connection-label {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.6rem;
  display: inline-block;
  margin-right: 0.3rem;
}

.speculative-caveat {
  max-width: 720px;
  margin: 0 auto 2rem;
  padding: 1.5rem 2rem;
  background: rgba(201,168,76,0.06);
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius-md);
}

.speculative-caveat h4 {
  font-size: var(--scale-base);
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.speculative-caveat p {
  font-size: var(--scale-sm);
  color: var(--muted);
  line-height: 1.75;
}

/* ─── Methodology Section ─────────────────────────────────────────────────── */
#section-methodology {
  background: var(--bg);
  border-top: 1px solid var(--border);
}

.methodology-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.callout-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
}

.callout-block h3 {
  font-size: var(--scale-md);
  color: var(--accent);
  margin-bottom: 0.875rem;
}

.callout-block p {
  font-size: var(--scale-sm);
  color: var(--muted);
  line-height: 1.75;
}

.sources-block {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.sources-block h3 {
  font-size: var(--scale-lg);
  margin-bottom: 1.5rem;
  color: var(--text);
}

.sources-block ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 0.75rem;
}

.sources-block li {
  font-size: var(--scale-sm);
  color: var(--muted);
  padding-left: 1rem;
  border-left: 2px solid var(--border);
  line-height: 1.5;
}

/* ─── Footer ──────────────────────────────────────────────────────────────── */
#site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  text-align: center;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: var(--scale-md);
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.footer-text {
  font-size: var(--scale-sm);
  color: var(--subtle);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ─── Animate-in utility ──────────────────────────────────────────────────── */
.animate-in {
  opacity: 0;
  translate: 0 20px;
  transition: opacity 0.5s ease, translate 0.5s ease;
}

.animate-in.visible {
  opacity: 1;
  translate: 0 0;
}

/* ─── Branch color utilities ──────────────────────────────────────────────── */
.branch-war    { color: var(--branch-war); }
.branch-science{ color: var(--branch-science); }
.branch-mind   { color: var(--branch-mind); }
.branch-power  { color: var(--branch-power); }

.bg-war    { background: var(--branch-war); }
.bg-science{ background: var(--branch-science); }
.bg-mind   { background: var(--branch-mind); }
.bg-power  { background: var(--branch-power); }

/* ─── Responsive ──────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
  #nav-menu {
    display: none;
    position: fixed;
    top: 48px;
    left: 0; right: 0;
    background: var(--surface);
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border);
    z-index: 850;
  }

  #nav-menu.open { display: flex; }
  #nav-toggle { display: block; }

  .intro-grid { grid-template-columns: 1fr; }
  .intro-portrait { display: none; }

  .controls-bar { top: 48px; flex-direction: column; align-items: stretch; gap: 0.5rem; }
  .controls-left { flex-direction: column; }
  .search-wrap { max-width: 100%; }

  #rankings-list { padding: 0 0.5rem; }
  .rank-row { gap: 0.5rem; }
  .cat-chip { display: none; }
  .rating-bar-wrap { display: none; }
  .stars { display: none; }

  .card-grid { grid-template-columns: 1fr; padding: 0 1rem 3rem; }
  .section { padding: 3rem 1rem; }
  .branch-header { padding: 3rem 1rem 2rem; }
  .filter-chips { padding: 0.5rem 0.5rem; }

  .hero-title { font-size: 2.5rem; }
  .hero-content { padding: 5rem 0 0 1.5rem; }

}

@media (max-width: 480px) {
  .rank-row { padding: 0.75rem 0; }
  .rank-num { width: 1.8rem; font-size: 0.75rem; }
  .rank-title { font-size: 0.9rem; }
}

/* ─── Prefers reduced motion ──────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .book-card, .animate-in {
    opacity: 1 !important;
    translate: none !important;
    transition: none !important;
  }
}

/* ─── Scrollbar ───────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--subtle); }

/* ─── Selection ───────────────────────────────────────────────────────────── */
::selection { background: var(--accent-dim); color: var(--text); }