/* ================================
   PAGE TRANSITIONS - Corey's Bookshop
   Book-like slide animations
   Forward = slide from right, Back = slide from left
   ================================ */

/* Page enter animation - default enters from right (forward) */
.transitions-ready body {
  animation: pageEnterFromRight 0.6s ease-out;
  overflow-x: hidden;
}

@keyframes pageEnterFromRight {
  from {
    opacity: 0;
    transform: translate3d(60px, 0, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@keyframes pageEnterFromLeft {
  from {
    opacity: 0;
    transform: translate3d(-60px, 0, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

/* Page exit animations */
body.page-exit-left {
  animation: pageExitLeft 0.5s ease-in forwards;
  overflow-x: hidden;
}

body.page-exit-right {
  animation: pageExitRight 0.5s ease-in forwards;
  overflow-x: hidden;
}

@keyframes pageExitLeft {
  from {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
  to {
    opacity: 0;
    transform: translate3d(-60px, 0, 0);
  }
}

@keyframes pageExitRight {
  from {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
  to {
    opacity: 0;
    transform: translate3d(60px, 0, 0);
  }
}

/* ================================
   BOOK NAVIGATION - Prev/Next Buttons
   ================================ */

.book-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-body);
}

.book-nav-top {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  background: linear-gradient(to bottom, rgba(245, 240, 232, 0.95), rgba(245, 240, 232, 0));
  padding-bottom: 1.5rem;
}

.book-nav-bottom {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.book-nav-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.book-nav-btn:hover {
  border-color: var(--color-gilded);
  color: var(--color-gilded);
}

.book-nav-btn:disabled,
.book-nav-btn.disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.book-nav-btn:disabled:hover,
.book-nav-btn.disabled:hover {
  border-color: var(--border-subtle);
  color: var(--text-secondary);
}

.book-nav-btn svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

.book-nav-page {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ================================
   PAGE TITLE NAVIGATION - Chevrons beside title
   ================================ */

.page-title-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
}

.page-title-nav h1 {
  margin: 0;
}

.page-chevron {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  color: var(--text-muted);
  text-decoration: none;
  transition: all 0.2s ease;
}

.page-chevron:hover {
  color: var(--color-gilded);
  background: rgba(184, 134, 11, 0.08);
}

.page-chevron.disabled {
  opacity: 0.2;
  cursor: default;
}

.page-chevron.disabled:hover {
  color: var(--text-muted);
  background: transparent;
}

.page-chevron svg {
  width: 24px;
  height: 24px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

/* Hide title nav on homepage */
.page-home .page-title-nav {
  display: none;
}

/* Hide top nav on homepage (cover has its own nav) */
.page-home .book-nav-top {
  display: none;
}

/* ================================
   PAGE CURVE EFFECT
   Gradient near spine to simulate page curve
   ================================ */

.page-inner .page-content-wrapper::before {
  content: '';
  position: fixed;
  top: 0;
  bottom: 0;
  left: var(--spine-width, 24px);
  width: 80px;
  background: linear-gradient(
    90deg,
    rgba(0, 0, 0, 0.18) 0%,
    rgba(0, 0, 0, 0.12) 20%,
    rgba(0, 0, 0, 0.06) 45%,
    rgba(0, 0, 0, 0.02) 70%,
    transparent 100%
  );
  pointer-events: none;
  z-index: 100;
}

/* No page curve on homepage - cover has its own spine */
.page-home::before {
  display: none;
}

/* ================================
   PAGE BACKGROUND SHADES
   Each page slightly different for book effect
   ================================ */

body[data-page-number="1"] { background-color: var(--page-bg-cover); }
body[data-page-number="2"] { background-color: var(--page-bg-1); }
body[data-page-number="3"] { background-color: var(--page-bg-2); }
body[data-page-number="4"] { background-color: var(--page-bg-3); }
body[data-page-number="5"] { background-color: var(--page-bg-4); }
body[data-page-number="6"] { background-color: var(--page-bg-5); }
body[data-page-number="7"] { background-color: var(--page-bg-6); }
body[data-page-number="8"] { background-color: var(--page-bg-7); }
body[data-page-number="9"] { background-color: var(--page-bg-8); }
body[data-page-number="10"] { background-color: var(--page-bg-9); }
body[data-page-number="11"] { background-color: var(--page-bg-10); }
body[data-page-number="12"] { background-color: var(--page-bg-11); }
body[data-page-number="13"] { background-color: var(--page-bg-12); }
body[data-page-number="14"] { background-color: var(--page-bg-13); }
body[data-page-number="15"] { background-color: var(--page-bg-14); }
body[data-page-number="16"] { background-color: var(--page-bg-back); }

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .transitions-ready body,
  body.page-exit-left,
  body.page-exit-right {
    animation: none;
  }
}

/* Mobile adjustments */
@media (max-width: 600px) {
  .book-nav {
    padding: 0.5rem 1rem;
  }

  .book-nav-btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
  }

  .book-nav-page {
    font-size: 0.75rem;
  }

  .page-title-nav {
    gap: 1rem;
  }

  .page-chevron {
    width: 32px;
    height: 32px;
  }

  .page-chevron svg {
    width: 20px;
    height: 20px;
  }
}