/* ARA Editora — Premium Literary Design System */
:root {
  --black: #050505;
  --graphite: #111111;
  --white: #ffffff;
  --gray: #bdbdbd;
  --gray-dim: rgba(189, 189, 189, 0.6);
  --gray-faint: rgba(189, 189, 189, 0.15);
  --border: rgba(189, 189, 189, 0.12);
  --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --font-serif: "Cormorant Garamond", "Georgia", serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --nav-h: 72px;
  --section-pad: clamp(4rem, 8vw, 7rem);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background: var(--black);
  color: var(--white);
  line-height: 1.65;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); border: 0;
}

/* ─── Typography ─── */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 1.15;
}

.section-label {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3.25rem);
  margin-bottom: 1.5rem;
}

.section-desc {
  color: var(--gray);
  font-size: 1.05rem;
  max-width: 560px;
}

.container {
  width: min(1200px, 92vw);
  margin: 0 auto;
}

/* ─── Navigation ─── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--transition), backdrop-filter var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(5, 5, 5, 0.92);
  backdrop-filter: blur(20px);
  border-color: var(--border);
}

.nav__inner {
  width: min(1200px, 92vw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav__logo img {
  height: 44px;
  width: auto;
  display: block;
  background: var(--white);
  padding: 4px 8px;
  border-radius: 6px;
  object-fit: contain;
}

.nav__logo span {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.nav__links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav__links a {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
  transition: color 0.3s;
  position: relative;
}

.nav__links a::after {
  content: "";
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--white);
  transition: width 0.3s;
}

.nav__links a:hover,
.nav__links a.active { color: var(--white); }
.nav__links a:hover::after,
.nav__links a.active::after { width: 100%; }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

.nav__toggle span {
  display: block;
  width: 22px; height: 1px;
  background: var(--white);
  transition: transform 0.3s, opacity 0.3s;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 2rem;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.btn--primary {
  background: var(--white);
  color: var(--black);
  border-color: var(--white);
}

.btn--primary:hover {
  background: transparent;
  color: var(--white);
}

.btn--ghost {
  background: transparent;
  color: var(--white);
}

.btn--ghost:hover {
  border-color: var(--white);
  background: rgba(255,255,255,0.05);
}

.btn--sm { padding: 0.65rem 1.25rem; font-size: 0.72rem; }

/* ─── Hero ─── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--black);
}

.hero__canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__particles {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: calc(var(--nav-h) + 2rem) 1.5rem 4rem;
  max-width: 800px;
}

.hero__logo {
  width: clamp(120px, 18vw, 165px);
  height: auto;
  margin: 0 auto 2rem;
  opacity: 0;
  animation: fadeUp 1s 0.2s forwards;
  background: rgba(255, 255, 255, 0.96);
  padding: 0.75rem 1rem;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  object-fit: contain;
}

.hero__title {
  font-size: clamp(3rem, 8vw, 5.5rem);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  opacity: 0;
  animation: fadeUp 1s 0.4s forwards;
}

.hero--brand .hero__title {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  opacity: 0;
  animation: none;
}

.hero--brand .hero__subtitle {
  animation-delay: 0.35s;
}

.hero__subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-style: italic;
  color: var(--gray);
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 1s 0.6s forwards;
}

.hero__text {
  color: var(--gray-dim);
  font-size: 1.05rem;
  max-width: 520px;
  margin: 0 auto 2.5rem;
  opacity: 0;
  animation: fadeUp 1s 0.8s forwards;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 1s 1s forwards;
}

.hero__scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--gray);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  animation: pulse 2s infinite;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--gray), transparent);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ─── Sections ─── */
section { padding: var(--section-pad) 0; position: relative; }

.section--graphite { background: var(--graphite); }

/* ─── About ─── */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about__pillars {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}

.pillar {
  padding: 1.5rem;
  border: 1px solid var(--border);
  transition: border-color var(--transition), transform var(--transition);
}

.pillar:hover {
  border-color: var(--gray-dim);
  transform: translateY(-2px);
}

.pillar h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.pillar p {
  color: var(--gray);
  font-size: 0.92rem;
}

/* ─── Author Featured ─── */
.author-featured__grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 4rem;
  align-items: start;
}

.author-featured__photo {
  aspect-ratio: 3/4;
  object-fit: cover;
  border: 1px solid var(--border);
  filter: grayscale(20%);
}

.author-featured__bio {
  color: var(--gray);
  margin: 1.5rem 0 2rem;
  font-size: 0.95rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.stat {
  background: var(--black);
  padding: 1.5rem;
  text-align: center;
}

.stat__value {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  display: block;
  margin-bottom: 0.25rem;
}

.stat__label {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gray);
}

/* ─── Catalog ─── */
.catalog__filters {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray);
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.filter-btn:hover,
.filter-btn.active {
  color: var(--black);
  background: var(--white);
  border-color: var(--white);
}

.catalog__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 2rem;
}

/* ─── Book Card ─── */
.book-card {
  perspective: 1200px;
  cursor: pointer;
}

.book-card__inner {
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1), box-shadow 0.6s;
}

.book-card:hover .book-card__inner {
  transform: translateY(-12px) rotateX(4deg) rotateY(-3deg);
}

.book-card__cover-wrap {
  position: relative;
  aspect-ratio: 2/3;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--graphite);
}

.book-card__cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s;
}

.book-card:hover .book-card__cover { transform: scale(1.04); }

.book-card__shadow {
  position: absolute;
  bottom: -8px;
  left: 10%;
  right: 10%;
  height: 20px;
  background: radial-gradient(ellipse, rgba(0,0,0,0.5), transparent);
  opacity: 0;
  transition: opacity 0.6s;
}

.book-card:hover .book-card__shadow { opacity: 1; }

.book-card__info { padding: 1.25rem 0.25rem 0; }

.book-card__title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
  transition: color 0.3s;
}

.book-card:hover .book-card__title { color: var(--gray); }

.book-card__meta {
  font-size: 0.75rem;
  color: var(--gray);
  letter-spacing: 0.05em;
}

/* ─── Highlights ─── */
.highlights__tabs {
  display: flex;
  gap: 2rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  padding: 0.75rem 0;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
  border-bottom: 1px solid transparent;
  margin-bottom: -1px;
  transition: all 0.3s;
}

.tab-btn.active {
  color: var(--white);
  border-color: var(--white);
}

.highlights__track {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1.5rem;
}

.highlight-card {
  border: 1px solid var(--border);
  padding: 1rem;
  transition: border-color 0.3s, transform 0.3s;
  cursor: pointer;
}

.highlight-card:hover {
  border-color: var(--gray-dim);
  transform: translateY(-4px);
}

.highlight-card img {
  aspect-ratio: 2/3;
  object-fit: cover;
  margin-bottom: 0.75rem;
  border: 1px solid var(--border);
}

.highlight-card h4 {
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.highlight-card span {
  font-size: 0.7rem;
  color: var(--gray);
}

/* ─── Timeline ─── */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--gray-faint), var(--gray), var(--gray-faint));
}

.timeline__item {
  position: relative;
  padding-bottom: 2.5rem;
  padding-left: 2rem;
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.6s, transform 0.6s;
}

.timeline__item.visible {
  opacity: 1;
  transform: translateX(0);
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -2rem; top: 0.4rem;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--white);
  transform: translateX(-3px);
}

.timeline__year {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.timeline__books {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timeline__book-tag {
  font-size: 0.75rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border);
  color: var(--gray);
  transition: all 0.3s;
  cursor: pointer;
}

.timeline__book-tag:hover {
  border-color: var(--white);
  color: var(--white);
}

/* ─── Quotes ─── */
.quotes__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.quote {
  padding: 2rem;
  border: 1px solid var(--border);
  position: relative;
}

.quote::before {
  content: "\201C";
  font-family: var(--font-serif);
  font-size: 4rem;
  position: absolute;
  top: -0.5rem; left: 1rem;
  color: var(--gray-faint);
  line-height: 1;
}

.quote p {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-style: italic;
  color: var(--gray);
  margin-bottom: 1rem;
}

.quote cite {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray-dim);
  font-style: normal;
}

/* ─── FAQ ─── */
.faq__list { max-width: 720px; }

.faq__item {
  border-bottom: 1px solid var(--border);
}

.faq__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 0;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  text-align: left;
  color: var(--white);
  transition: color 0.3s;
}

.faq__question:hover { color: var(--gray); }

.faq__icon {
  font-size: 1.25rem;
  color: var(--gray);
  transition: transform 0.3s;
  flex-shrink: 0;
  margin-left: 1rem;
}

.faq__item.open .faq__icon { transform: rotate(45deg); }

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s;
}

.faq__answer p {
  color: var(--gray);
  font-size: 0.92rem;
  padding-bottom: 1.25rem;
}

.faq__item.open .faq__answer { max-height: 300px; }

/* ─── Contact ─── */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.contact__info h3 {
  font-size: 1.75rem;
  margin-bottom: 2rem;
}

.contact__item {
  margin-bottom: 1.5rem;
}

.contact__item label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 0.35rem;
}

.contact__item a,
.contact__item span {
  font-size: 1.05rem;
}

.contact__item a:hover { color: var(--gray); }

/* ─── Footer ─── */
.footer {
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--border);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer__brand p {
  color: var(--gray);
  font-size: 0.85rem;
  margin-top: 1rem;
  max-width: 280px;
}

.footer__col h4 {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 1rem;
}

.footer__col a {
  display: block;
  font-size: 0.85rem;
  color: var(--gray-dim);
  margin-bottom: 0.5rem;
  transition: color 0.3s;
}

.footer__col a:hover { color: var(--white); }

.footer__social {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.footer__social a {
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  transition: border-color 0.3s;
}

.footer__social a:hover { border-color: var(--white); }

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--gray);
  flex-wrap: wrap;
  gap: 1rem;
}

/* ─── Modal ─── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(5, 5, 5, 0.92);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s, visibility 0.4s;
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--graphite);
  border: 1px solid var(--border);
  width: min(960px, 100%);
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(30px) scale(0.97);
  transition: transform 0.5s cubic-bezier(0.23, 1, 0.32, 1);
  position: relative;
}

.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}

.modal__toolbar {
  position: sticky;
  top: 0;
  z-index: 12;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: rgba(17, 17, 17, 0.98);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.modal__toolbar-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.modal__toolbar-back:hover {
  color: var(--white);
  border-color: var(--white);
  background: rgba(255, 255, 255, 0.04);
}

.modal__close {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  color: var(--gray);
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}

.modal__close:hover {
  border-color: var(--white);
  color: var(--white);
}

.modal__grid {
  display: grid;
  grid-template-columns: 280px 1fr;
}

.modal__cover-wrap {
  padding: 2rem;
  background: var(--black);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal__cover {
  max-height: 400px;
  width: auto;
  border: 1px solid var(--border);
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.modal__body {
  padding: 2rem 2.5rem 2.5rem 2rem;
}

.modal__content {
  max-width: 100%;
}

.modal__title {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

.modal__subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--gray);
  margin-bottom: 0.5rem;
}

.modal__author {
  font-size: 0.85rem;
  color: var(--gray);
  margin-bottom: 1.5rem;
}

.modal__synopsis {
  color: var(--gray-dim);
  font-size: 0.92rem;
  margin-bottom: 1.75rem;
  line-height: 1.75;
  padding-right: 0.5rem;
}

.modal__meta {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 2rem;
  margin-bottom: 1.75rem;
  font-size: 0.82rem;
  padding: 1.5rem 1.75rem;
  border: 1px solid var(--border);
  background: rgba(5, 5, 5, 0.35);
  border-radius: 4px;
}

.modal__meta > div {
  padding: 0.15rem 0;
}

.modal__meta dt {
  color: var(--gray);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.modal__meta dd { margin-bottom: 0.5rem; }

.modal__categories {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.modal__tag {
  font-size: 0.68rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--border);
  color: var(--gray);
}

.modal__stats {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  font-size: 0.8rem;
  color: var(--gray);
}

.modal__prices {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.modal__price {
  flex: 1;
  min-width: 130px;
  padding: 1.1rem 1.5rem;
  border: 1px solid var(--border);
  font-size: 0.85rem;
}

.modal__price span {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--gray);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.modal__price strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.35rem;
  color: var(--white);
  line-height: 1.2;
}

.modal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.modal__stores {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.modal__stores h4 {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
  margin-bottom: 0.75rem;
}

.modal__store-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.modal__store-links a,
.store-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.72rem;
  padding: 0.65rem 1rem;
  border: 1px solid var(--border);
  color: var(--gray);
  transition: all 0.3s;
}

.modal__store-links a img,
.store-link img {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  object-fit: contain;
}

.modal__store-links a:hover,
.store-link:hover {
  border-color: var(--white);
  color: var(--white);
}

/* Botão fixo — voltar ao início */
.back-home {
  position: fixed;
  top: calc(var(--nav-h) + 12px);
  left: max(1rem, calc((100vw - 1200px) / 2 + 1rem));
  z-index: 999;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--white);
  padding: 0.6rem 1.1rem;
  background: rgba(17, 17, 17, 0.92);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  transition: border-color 0.3s, background 0.3s, transform 0.3s;
}

.back-home:hover {
  border-color: var(--white);
  background: rgba(5, 5, 5, 0.95);
  transform: translateY(-1px);
}

.back-home--hidden { display: none; }

.page-back-bar {
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.page-back-bar .back-home-inline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
  padding: 0.55rem 1rem;
  border: 1px solid var(--border);
  transition: all 0.3s;
}

.page-back-bar .back-home-inline:hover {
  color: var(--white);
  border-color: var(--white);
}

/* ─── Scroll to top ─── */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  z-index: 1500;
  width: 48px;
  height: 48px;
  border: 1px solid var(--border);
  background: rgba(17, 17, 17, 0.92);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(12px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.35s, visibility 0.35s, transform 0.35s, border-color 0.3s, background 0.3s;
  cursor: pointer;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top:hover {
  border-color: var(--white);
  background: rgba(5, 5, 5, 0.95);
  transform: translateY(-2px);
}

.scroll-top svg {
  width: 20px;
  height: 20px;
}

/* ─── WhatsApp Float ─── */
.whatsapp-float {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1500;
  width: 56px; height: 56px;
  background: var(--white);
  color: var(--black);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
  transition: transform 0.3s, box-shadow 0.3s;
}

.whatsapp-float:hover {
  transform: scale(1.08);
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.whatsapp-float svg { width: 28px; height: 28px; }

/* ─── Book Page ─── */
.page-hero {
  padding: calc(var(--nav-h) + 3rem) 0 3rem;
  border-bottom: 1px solid var(--border);
}

.book-detail__grid {
  display: grid;
  grid-template-columns: minmax(260px, 320px) 1fr;
  gap: 3rem 4rem;
  padding: 0 0 var(--section-pad);
}

.book-detail__cover {
  border: 1px solid var(--border);
  box-shadow: 0 30px 80px rgba(0,0,0,0.4);
}

.book-detail__content {
  padding: 0.5rem 1rem 0 2rem;
  min-width: 0;
}

.book-detail__content .modal__synopsis,
.book-detail__content .modal__meta {
  margin-left: 0;
}

.book-detail__title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 0.5rem;
}

.breadcrumb {
  font-size: 0.75rem;
  color: var(--gray);
  margin-bottom: 2rem;
  margin-top: 0.5rem;
  padding-left: 0.25rem;
  letter-spacing: 0.05em;
}

.breadcrumb a:hover { color: var(--white); }

/* ─── Author Page ─── */
.author-hero {
  padding: calc(var(--nav-h) + 4rem) 0 4rem;
  text-align: center;
}

.author-hero__photo {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1.5rem;
  border: 2px solid var(--border);
}

.author-hero__name {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: 0.5rem;
}

/* ─── Reveal animations ─── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s, transform 0.8s;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Responsive ─── */
@media (max-width: 900px) {
  .nav__links {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: var(--black);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    transition: transform 0.4s;
  }

  .nav__links.open { transform: translateY(0); }
  .nav__toggle { display: flex; }

  .about__grid,
  .author-featured__grid,
  .contact__grid,
  .footer__grid,
  .modal__grid,
  .book-detail__grid,
  .quotes__grid { grid-template-columns: 1fr; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .modal__body { padding: 1.75rem 1.5rem 2rem; }
  .modal__cover-wrap { padding: 1.5rem; }
  .book-detail__content { padding: 0; }
  .back-home { left: 1rem; }
  .scroll-top { bottom: 1.5rem; left: 1rem; width: 44px; height: 44px; }
}

@media (max-width: 600px) {
  .stats-grid { grid-template-columns: 1fr; }
  .highlights__tabs { gap: 1rem; overflow-x: auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}