/* SCRIBO Story - Book Layout
   A proper book with alternating text and images */

:root {
  --color-bg: #0a0a0a;
  --color-text: #e8e4df;
  --color-text-dim: #8a8580;
  --color-accent: #c9a227;
  --color-surface: #141414;
  --font-serif: 'Libre Baskerville', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-serif);
  line-height: 1.7;
  min-height: 100vh;
}

/* Page Transition Overlay */
.page-transition {
  position: fixed;
  inset: 0;
  background: #000000;
  z-index: 9999;
  pointer-events: none;
  opacity: 1;
  transition: opacity 0.8s ease-out;
}

.page-transition.fade-out {
  opacity: 0;
}

.page-transition.fade-in {
  opacity: 1;
  transition: opacity 0.6s ease-in;
}

/* ===================
   HAMBURGER MENU
   =================== */

.menu-toggle {
  position: fixed;
  top: 1.5rem;
  left: 1.5rem;
  z-index: 1001;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  padding: 10px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all 0.3s ease;
  opacity: 0.7;
}

.menu-toggle:hover span {
  opacity: 1;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* Menu Overlay */
.menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.95);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.menu-overlay.active {
  opacity: 1;
  visibility: visible;
}

.menu-content {
  text-align: left;
  padding: 2rem;
}

.menu-title {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: 2rem;
}

.menu-chapters {
  list-style: none;
}

.menu-chapters li {
  margin-bottom: 1.25rem;
}

.menu-chapters a {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
  opacity: 0.6;
  transition: opacity 0.3s ease;
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.menu-chapters a:hover {
  opacity: 1;
}

.menu-chapters a.current {
  opacity: 1;
  color: var(--color-accent);
}

.chapter-number {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 300;
  color: var(--color-text-dim);
  min-width: 20px;
}

/* ===================
   CHAPTER HERO
   =================== */

.chapter-hero {
  position: relative;
  height: 100vh;
  overflow: hidden;
}

.chapter-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.chapter-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(0, 0, 0, 0.3) 0%,
    rgba(0, 0, 0, 0.5) 50%,
    rgba(0, 0, 0, 0.7) 100%
  );
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
}

.chapter-number-display {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 300;
  letter-spacing: 0.3em;
  color: var(--color-accent);
  margin-bottom: 1rem;
  opacity: 0.8;
}

.chapter-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 12vw, 7rem);
  font-weight: 400;
  font-style: italic;
  color: #ffffff;
  line-height: 1;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

/* ===================
   BOOK SECTIONS
   =================== */

.book-section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem 2rem;
}

/* Text-only section (like a chapter opening) */
.section-text {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

/* Image section (full bleed) */
.section-image {
  padding: 0;
  position: relative;
  overflow: hidden;
}

.section-image img {
  width: 100%;
  height: 100vh;
  object-fit: cover;
  opacity: 0.85;
}

/* Image with caption overlay */
.section-image .image-caption {
  position: absolute;
  bottom: 4rem;
  left: 0;
  right: 0;
  text-align: center;
  padding: 2rem;
}

.section-image .image-caption p {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--color-text);
  max-width: 600px;
  margin: 0 auto;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.8);
}

/* Split section (50/50 text and image) */
.section-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
  padding: 0;
}

.section-split.reverse {
  direction: rtl;
}

.section-split.reverse > * {
  direction: ltr;
}

.split-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 4rem;
  max-width: 600px;
  margin: 0 auto;
}

.split-image {
  position: relative;
  overflow: hidden;
}

.split-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ===================
   TYPOGRAPHY
   =================== */

.chapter-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 400;
  font-style: italic;
  color: var(--color-text);
  margin-bottom: 2rem;
  line-height: 1.1;
}

.chapter-subtitle {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  margin-bottom: 1rem;
}

.book-paragraph {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 1.5rem;
  opacity: 0.9;
}

.book-paragraph:last-child {
  margin-bottom: 0;
}

.book-quote {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-style: italic;
  line-height: 1.6;
  color: var(--color-text);
  padding: 2rem 0;
  border-left: 2px solid var(--color-accent);
  padding-left: 2rem;
  margin: 2rem 0;
}

.emphasis {
  color: var(--color-accent);
}

.small-text {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-dim);
  letter-spacing: 0.05em;
}

/* ===================
   CONTINUE BUTTON
   =================== */

.continue-section {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
}

.continue-btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text);
  background: transparent;
  border: 1px solid rgba(232, 228, 223, 0.3);
  padding: 1rem 3rem;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-block;
}

.continue-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ===================
   FOOTER
   =================== */

.book-footer {
  text-align: center;
  padding: 2rem;
  margin-top: 2rem;
}

.book-footer p {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--color-text-dim);
  letter-spacing: 0.1em;
  opacity: 0.6;
}

/* ===================
   ANIMATIONS
   =================== */

.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
}

.stagger-children.visible > *:nth-child(1) { animation: fadeUp 0.8s ease-out 0.1s forwards; }
.stagger-children.visible > *:nth-child(2) { animation: fadeUp 0.8s ease-out 0.2s forwards; }
.stagger-children.visible > *:nth-child(3) { animation: fadeUp 0.8s ease-out 0.3s forwards; }
.stagger-children.visible > *:nth-child(4) { animation: fadeUp 0.8s ease-out 0.4s forwards; }
.stagger-children.visible > *:nth-child(5) { animation: fadeUp 0.8s ease-out 0.5s forwards; }

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

/* ===================
   RESPONSIVE
   =================== */

@media (max-width: 768px) {
  .section-split {
    grid-template-columns: 1fr;
  }

  .section-split.reverse {
    direction: ltr;
  }

  .split-text {
    padding: 3rem 2rem;
    order: 2;
  }

  .split-image {
    height: 50vh;
    order: 1;
  }

  .book-section {
    padding: 3rem 1.5rem;
  }

  .chapter-title {
    font-size: clamp(2rem, 10vw, 3.5rem);
  }

  .book-paragraph {
    font-size: 1rem;
  }

  .menu-toggle {
    top: 1rem;
    left: 1rem;
  }
}

/* ===================
   SCROLLBAR
   =================== */

::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--color-text-dim);
  border-radius: 2px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent);
}