/* Shared visual layer for every book route. Theme tokens come from each route's existing stylesheet. */
:root {
  --v2-stage: #0b1217;
  --v2-stage-ink: #f6f1e8;
  --v2-stage-muted: rgba(246, 241, 232, 0.68);
  --v2-stage-line: rgba(246, 241, 232, 0.19);
  --v2-surface-line: rgba(19, 30, 36, 0.18);
}

body[class*="book-"] {
  --stage: var(--v2-stage);
  --stage-ink: var(--v2-stage-ink);
  --stage-muted: var(--v2-stage-muted);
  --stage-line: var(--v2-stage-line);
  --stage-accent: var(--accent, #d67c58);
  --stage-secondary: var(--brand-strong, #234d6d);
  --stage-surface: var(--paper, #f4f1e9);
  --stage-surface-strong: var(--brand-soft, #e8ece8);
  --stage-surface-line: var(--line, #cbd3d4);
  overflow-x: hidden;
  background: var(--stage-surface);
  letter-spacing: 0;
}

body[class*="book-"]::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    repeating-linear-gradient(90deg, rgba(17, 27, 33, 0.038) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(0deg, rgba(17, 27, 33, 0.026) 0 1px, transparent 1px 48px);
  opacity: 0.72;
}

/* The two newest sites already carry this art direction; the shared layer upgrades the remaining routes. */
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .topbar {
  grid-template-columns: auto minmax(0, 1fr) auto;
  min-height: 76px;
  padding-top: 12px;
  padding-bottom: 12px;
  border: 0;
  border-bottom: 1px solid var(--stage-line);
  background: rgba(11, 18, 23, 0.94);
  color: var(--stage-ink);
  box-shadow: 0 12px 32px rgba(9, 14, 18, 0.13);
  backdrop-filter: blur(18px) saturate(120%);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .brand {
  min-width: 218px;
  gap: 12px;
  color: var(--stage-ink);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .brand-mark {
  width: 44px;
  height: 44px;
  border: 1px solid var(--stage-accent);
  border-radius: 0;
  background: transparent;
  color: var(--stage-ink);
  box-shadow: 5px 5px 0 var(--stage-accent);
  font-family: Consolas, "Courier New", monospace;
  letter-spacing: 0;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .brand strong {
  color: var(--stage-ink);
  font-family: "Arial Narrow", "Microsoft YaHei", sans-serif;
  font-size: 16px;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .brand small {
  color: var(--stage-muted);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .nav {
  justify-content: flex-end;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .nav::-webkit-scrollbar {
  display: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .nav a {
  position: relative;
  min-height: 44px;
  padding: 0 11px;
  border-radius: 0;
  color: var(--stage-muted);
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0;
  transition: color 220ms ease, background 220ms ease;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .nav a::after {
  position: absolute;
  right: 10px;
  bottom: 5px;
  left: 10px;
  height: 2px;
  background: var(--stage-accent);
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 260ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .nav a:hover,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .nav a.active {
  color: var(--stage-ink);
  background: rgba(255, 255, 255, 0.06);
  box-shadow: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .nav a:hover::after,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .nav a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .top-actions {
  min-width: 182px;
  gap: 8px;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .top-actions .primary-button,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .top-actions .secondary-button {
  min-height: 40px;
  color: var(--stage-ink);
  border-color: var(--stage-line);
  background: transparent;
  box-shadow: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .top-actions .primary-button:hover {
  color: var(--stage);
  background: var(--stage-accent);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .top-actions .tag,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .top-actions .sync-indicator {
  color: var(--stage-muted);
  border-color: var(--stage-line);
  background: transparent;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-band {
  min-height: min(770px, calc(100vh - 76px));
  isolation: isolate;
  background-color: var(--stage);
  background-image:
    repeating-linear-gradient(90deg, transparent 0 118px, var(--stage-line) 119px 120px),
    repeating-linear-gradient(0deg, transparent 0 118px, rgba(246, 241, 232, 0.08) 119px 120px),
    linear-gradient(90deg, transparent calc(var(--pointer-x, 50%) - 0.5px), rgba(246, 241, 232, 0.23) var(--pointer-x, 50%), transparent calc(var(--pointer-x, 50%) + 0.5px)),
    linear-gradient(0deg, transparent calc(var(--pointer-y, 50%) - 0.5px), rgba(246, 241, 232, 0.18) var(--pointer-y, 50%), transparent calc(var(--pointer-y, 50%) + 0.5px));
  color: var(--stage-ink);
  border: 0;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-band::before {
  position: absolute;
  top: 30px;
  left: max(18px, calc((100vw - 1180px) / 2));
  z-index: 0;
  color: var(--stage-accent);
  content: "FIELD / 01";
  font-family: Consolas, "Courier New", monospace;
  font-size: 10px;
  font-weight: 700;
  writing-mode: vertical-rl;
  opacity: 0.9;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-band::after {
  position: absolute;
  top: 8%;
  right: -1vw;
  z-index: -1;
  color: transparent;
  content: "01";
  font-family: "Arial Narrow", Impact, sans-serif;
  font-size: clamp(220px, 34vw, 560px);
  font-weight: 900;
  line-height: 0.78;
  -webkit-text-stroke: 1px var(--stage-line);
  opacity: 0.72;
  pointer-events: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-grid {
  position: relative;
  min-height: inherit;
  padding-top: 112px;
  padding-bottom: 86px;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 0.8fr);
  gap: clamp(34px, 7vw, 96px);
  align-items: center;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-grid::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 55.4%;
  width: 1px;
  background: var(--stage-line);
  content: "";
  pointer-events: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-grid > div:first-child {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-band .eyebrow {
  color: var(--stage-accent);
  font-family: Consolas, "Courier New", monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-grid h1 {
  max-width: 760px;
  margin: 18px 0 24px;
  color: var(--stage-ink);
  font-family: "Arial Narrow", "Microsoft YaHei", sans-serif;
  font-size: clamp(52px, 7vw, 106px);
  font-weight: 850;
  line-height: 0.88;
  text-wrap: balance;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-grid h1::selection {
  color: var(--stage);
  background: var(--stage-accent);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-grid p {
  max-width: 560px;
  color: var(--stage-muted);
  font-size: 16px;
  line-height: 1.8;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-actions {
  gap: 8px;
  margin-top: 34px;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-band .primary-button {
  color: var(--stage);
  border-color: var(--stage-accent);
  background: var(--stage-accent);
  box-shadow: 6px 6px 0 var(--stage-acid, #cfd886);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-band .primary-button:hover {
  color: var(--stage);
  background: var(--stage-ink);
  box-shadow: 2px 2px 0 var(--stage-acid, #cfd886);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-band .secondary-button,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-band .ghost-button {
  color: var(--stage-ink);
  border-color: var(--stage-line);
  background: transparent;
  box-shadow: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-band .secondary-button:hover,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-band .ghost-button:hover {
  color: var(--stage);
  border-color: var(--stage-ink);
  background: var(--stage-ink);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview {
  position: relative;
  min-height: 560px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  transform: perspective(1200px) rotateX(var(--tilt-y, 0deg)) rotateY(var(--tilt-x, 0deg));
  transform-style: preserve-3d;
  transition: transform 480ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview::before {
  position: absolute;
  inset: 7% 3% 6% 8%;
  border: 1px solid var(--stage-line);
  content: "";
  transform: translateZ(-20px) rotate(3deg);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview::after {
  position: absolute;
  right: 3%;
  bottom: 2%;
  color: var(--stage-accent);
  content: "ARCHIVE / PREVIEW";
  font-family: Consolas, "Courier New", monospace;
  font-size: 10px;
  font-weight: 700;
  writing-mode: vertical-rl;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview img {
  position: absolute;
  width: 39%;
  height: auto;
  aspect-ratio: 3 / 4;
  border: 1px solid rgba(246, 241, 232, 0.45);
  border-radius: 0;
  box-shadow: 16px 22px 36px rgba(0, 0, 0, 0.3);
  filter: saturate(0.9) contrast(1.02);
  object-fit: cover;
  transition: transform 520ms cubic-bezier(0.16, 1, 0.3, 1), filter 320ms ease;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview img:nth-child(1) {
  top: 1%;
  left: 5%;
  z-index: 1;
  transform: translateZ(42px) rotate(-7deg);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview img:nth-child(2) {
  top: 9%;
  right: 5%;
  z-index: 3;
  transform: translateZ(80px) rotate(5deg);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview img:nth-child(3) {
  bottom: 3%;
  left: 13%;
  z-index: 2;
  transform: translateZ(54px) rotate(4deg);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview img:nth-child(4) {
  right: 0;
  bottom: 0;
  z-index: 4;
  transform: translateZ(110px) rotate(-4deg);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview:hover img:nth-child(1) {
  transform: translate3d(-8px, 5px, 56px) rotate(-9deg);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview:hover img:nth-child(2) {
  transform: translate3d(8px, -6px, 98px) rotate(7deg);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview:hover img:nth-child(3) {
  transform: translate3d(-4px, 7px, 68px) rotate(6deg);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview:hover img:nth-child(4) {
  transform: translate3d(7px, -9px, 128px) rotate(-6deg);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .section {
  padding-top: 86px;
  padding-bottom: 86px;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .stats-grid {
  gap: 0;
  border-top: 1px solid var(--stage-surface-line);
  border-bottom: 1px solid var(--stage-surface-line);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .stat {
  min-height: 142px;
  padding: 26px 24px 22px;
  border: 0;
  border-right: 1px solid var(--stage-surface-line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .stat:last-child {
  border-right: 0;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .stat::before {
  display: block;
  width: 24px;
  height: 3px;
  margin-bottom: 22px;
  background: var(--stage-accent);
  content: "";
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .stat span {
  color: var(--muted);
  font-family: Consolas, "Courier New", monospace;
  font-size: 10px;
  font-weight: 700;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .stat strong {
  color: var(--ink);
  font-family: "Arial Narrow", "Microsoft YaHei", sans-serif;
  font-size: clamp(30px, 3.5vw, 52px);
  font-weight: 800;
  line-height: 0.95;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .focus-grid {
  gap: 0;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  border-top: 1px solid var(--stage-surface-line);
  border-bottom: 1px solid var(--stage-surface-line);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .focus-card {
  min-height: 260px;
  padding: 34px 34px 30px;
  border: 0;
  border-right: 1px solid var(--stage-surface-line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .focus-card:last-child {
  border-right: 0;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .focus-card.primary-focus {
  color: var(--stage-ink);
  background: var(--stage);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .focus-card.primary-focus .eyebrow,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .focus-card.primary-focus .muted {
  color: var(--stage-muted);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .focus-card.primary-focus h2 {
  color: var(--stage-ink);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .focus-card h2 {
  max-width: 720px;
  font-size: clamp(28px, 4vw, 58px);
  line-height: 0.98;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .focus-card:nth-child(2) h2 {
  font-size: clamp(32px, 5vw, 64px);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .panel {
  border: 1px solid var(--stage-surface-line);
  border-radius: 0;
  background: var(--stage-surface);
  box-shadow: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .panel-pad {
  padding: 30px;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .course-list,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .practice-list {
  gap: 0;
  align-self: start;
  border-top: 1px solid var(--stage-surface-line);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .course-item,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .practice-item,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .paper-card {
  position: relative;
  min-height: 112px;
  padding: 20px 22px;
  border: 0;
  border-bottom: 1px solid var(--stage-surface-line);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  text-align: left;
  transform: none;
  transition: background 220ms ease, color 220ms ease;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .course-item::before,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .practice-item::before,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .paper-card::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--stage-accent);
  content: "";
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 240ms ease;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .course-item:hover,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .practice-item:hover,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .paper-card:hover,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .course-item.active,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .practice-item.active,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .paper-card.active {
  border-color: var(--stage-surface-line);
  background: var(--stage-surface-strong);
  transform: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .course-item:hover::before,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .practice-item:hover::before,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .paper-card:hover::before,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .course-item.active::before,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .practice-item.active::before,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .paper-card.active::before {
  transform: scaleY(1);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .lesson-section,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .lesson-note,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .question,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .answer-card,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .review-card,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .history-row,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .empty-state,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .user-row {
  border-radius: 0;
  box-shadow: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .question,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .lesson-section {
  border-color: var(--stage-surface-line);
  background: transparent;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .option {
  border-radius: 0;
  border-color: var(--stage-surface-line);
  background: var(--stage-surface);
  transition: border-color 200ms ease, background 200ms ease, transform 200ms ease;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .option:hover {
  border-color: var(--stage-accent);
  background: var(--stage-surface-strong);
  transform: translateX(5px);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .progress-bar,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .quiz-meter {
  height: 5px;
  border-radius: 0;
  background: var(--stage-surface-strong);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .progress-bar span,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .quiz-meter span {
  border-radius: 0;
  background: var(--stage-accent);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .primary-button,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .secondary-button,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .ghost-button,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .icon-button,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .segment {
  min-height: 44px;
  border-radius: 0;
  letter-spacing: 0;
  transition: color 220ms ease, background 220ms ease, border-color 220ms ease, box-shadow 220ms ease, transform 220ms ease;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .primary-button {
  color: var(--stage-ink);
  background: var(--stage-secondary);
  box-shadow: 5px 5px 0 var(--stage-accent);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .primary-button:hover {
  color: var(--stage-ink);
  background: var(--stage);
  box-shadow: 1px 1px 0 var(--stage-accent);
  transform: translate(4px, 4px);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .secondary-button,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .ghost-button {
  color: var(--stage-secondary);
  border-color: var(--stage-surface-line);
  background: transparent;
  box-shadow: none;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .secondary-button:hover,
body[class*="book-"]:not(.book-bsks):not(.book-zsb) .ghost-button:hover {
  color: var(--stage-secondary);
  border-color: var(--stage-secondary);
  background: var(--stage-surface-strong);
}

body[class*="book-"] button > .lucide,
body[class*="book-"] a > .lucide,
body[class*="book-"] button > [data-lucide],
body[class*="book-"] a > [data-lucide] {
  width: 15px;
  height: 15px;
  margin-right: 8px;
  flex: 0 0 auto;
  stroke-width: 1.8;
}

body[class*="book-"] .icon-button > .lucide,
body[class*="book-"] .icon-button > [data-lucide] {
  margin-right: 0;
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .modal {
  border: 1px solid var(--stage-surface-line);
  border-radius: 0;
  background: rgba(13, 13, 18, 0.62);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .modal::backdrop {
  background: rgba(13, 13, 18, 0.78);
  backdrop-filter: blur(12px);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .modal-panel {
  border-top: 5px solid var(--stage-accent);
  border-radius: 0;
  background: var(--stage-surface);
}

body[class*="book-"]:not(.book-bsks):not(.book-zsb) .footer {
  border-top: 1px solid var(--stage-surface-line);
  background: var(--stage-surface);
}

body[class*="book-"] .motion-ready {
  opacity: 0;
  transform: translateY(20px);
}

body[class*="book-"] .motion-ready.motion-in {
  animation: v2-editorial-rise 720ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
  animation-delay: calc(var(--motion-index, 0) * 38ms);
}

body[class*="book-"] .hero-band.motion-ready {
  transform: none;
}

body[class*="book-"] .hero-band.motion-ready.motion-in {
  animation-name: v2-stage-reveal;
  animation-duration: 860ms;
}

@keyframes v2-editorial-rise {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes v2-stage-reveal {
  from { opacity: 0; clip-path: inset(0 0 12% 0); }
  to { opacity: 1; clip-path: inset(0 0 0 0); }
}

@media (max-width: 920px) {
  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .topbar {
    grid-template-columns: 1fr auto;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .nav {
    grid-column: 1 / -1;
    justify-content: flex-start;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-top: 86px;
    padding-bottom: 64px;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-grid::before {
    left: 14%;
    opacity: 0.4;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview {
    width: min(560px, 100%);
    min-height: 500px;
    margin-left: auto;
  }
}

@media (max-width: 560px) {
  body[class*="book-"] .topbar {
    grid-template-columns: minmax(0, 1fr) auto;
    padding-right: 16px;
    padding-left: 16px;
  }

  body[class*="book-"] .brand {
    min-width: 0;
  }

  body[class*="book-"] .top-actions {
    min-width: 0 !important;
    width: auto;
    gap: 4px;
  }

  body[class*="book-"] .nav {
    width: 100%;
    min-width: 0;
    max-width: 100%;
  }

  body[class*="book-"] .top-actions .button-small {
    padding-right: 8px;
    padding-left: 8px;
  }

  body[class*="book-"] .top-actions .button-small > .lucide {
    margin-right: 4px;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-grid {
    padding-top: 62px;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-grid h1 {
    max-width: 100%;
    font-size: 44px;
    line-height: 0.95;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .hero-grid p {
    font-size: 15px;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .book-preview {
    min-height: 390px;
    box-shadow: none;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .stat {
    min-height: 112px;
    padding: 18px 14px;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .stat:nth-child(2) {
    border-right: 0;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .stat:nth-child(-n + 2) {
    border-bottom: 1px solid var(--stage-surface-line);
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .stat strong {
    font-size: 28px;
  }

  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .panel-pad,
  body[class*="book-"]:not(.book-bsks):not(.book-zsb) .focus-card {
    padding: 20px;
  }

  body[class*="book-"] .hero-actions > * {
    flex: 1 1 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  body[class*="book-"] .motion-ready,
  body[class*="book-"] .motion-ready.motion-in,
  body[class*="book-"] .book-preview {
    animation: none !important;
    transform: none !important;
  }

  body[class*="book-"] *,
  body[class*="book-"] *::before,
  body[class*="book-"] *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}