/**
 * layout.css - Global Shell, Celestial Atmosphere, Opening Stage & Navigation
 * Uses the controlled palette: #10142B, #191D3A, #E8BD75, #F5EEDF, #A9A0C9, #DCE4F2
 */

html {
  scroll-behavior: smooth;
  background-color: var(--color-midnight-navy);
}

body {
  background-color: var(--color-midnight-navy);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Accessible Focus States Across All Interactive Elements */
:focus-visible {
  outline: 2px solid var(--color-warm-gold);
  outline-offset: 3px;
}

/* =========================================================================
   LAYERED CELESTIAL BACKGROUND & ATMOSPHERE
   ========================================================================= */
.celestial-background {
  position: fixed;
  inset: 0;
  z-index: var(--z-sky);
  pointer-events: none;
  overflow: hidden;
  background-color: var(--color-midnight-navy);
}

.ambient-sky-gradient {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 22%, #191D3A 0%, #10142B 78%);
  transition: background 1.2s ease, opacity 1.2s ease;
}

/* Dynamic Sky Mood Shifts Per Active Chapter */
body[data-active-chapter="3"] .ambient-sky-gradient,
body[data-active-chapter="6"] .ambient-sky-gradient {
  background: radial-gradient(ellipse at 65% 28%, rgba(232, 189, 117, 0.16) 0%, #191D3A 48%, #10142B 85%);
}

body[data-active-chapter="7"] .ambient-sky-gradient,
body[data-active-chapter="9"] .ambient-sky-gradient,
body[data-active-chapter="11"] .ambient-sky-gradient {
  background: radial-gradient(ellipse at 50% 30%, rgba(232, 189, 117, 0.18) 0%, #23284D 52%, #10142B 88%);
}

body[data-active-chapter="10"] .ambient-sky-gradient {
  background: radial-gradient(ellipse at 50% 35%, rgba(169, 160, 201, 0.12) 0%, #191D3A 55%, #0B0E1F 90%);
}

body[data-active-chapter="12"] .ambient-sky-gradient,
body[data-active-chapter="13"] .ambient-sky-gradient {
  background: radial-gradient(ellipse at 50% 25%, rgba(232, 189, 117, 0.22) 0%, #23284D 50%, #10142B 88%);
}

/* Subtle Multi-Layer Starfield */
.ambient-stars {
  position: absolute;
  inset: -120px 0;
  pointer-events: none;
  will-change: transform;
}

.ambient-stars--deep {
  background-image:
    radial-gradient(1.2px 1.2px at 14% 18%, #F5EEDF 85%, transparent),
    radial-gradient(1px 1px at 36% 42%, #DCE4F2 80%, transparent),
    radial-gradient(1.4px 1.4px at 68% 15%, #E8BD75 85%, transparent),
    radial-gradient(1px 1px at 84% 58%, #A9A0C9 80%, transparent),
    radial-gradient(1.2px 1.2px at 24% 76%, #DCE4F2 75%, transparent),
    radial-gradient(1.3px 1.3px at 56% 82%, #F5EEDF 80%, transparent),
    radial-gradient(1px 1px at 91% 28%, #DCE4F2 75%, transparent);
  background-size: 420px 420px;
  opacity: 0.45;
}

.ambient-stars--mid {
  background-image:
    radial-gradient(1.6px 1.6px at 22% 32%, #E8BD75 90%, transparent),
    radial-gradient(1.4px 1.4px at 74% 44%, #F5EEDF 85%, transparent),
    radial-gradient(1.5px 1.5px at 48% 12%, #DCE4F2 85%, transparent),
    radial-gradient(1.2px 1.2px at 12% 65%, #A9A0C9 85%, transparent),
    radial-gradient(1.5px 1.5px at 86% 78%, #E8BD75 80%, transparent);
  background-size: 580px 580px;
  opacity: 0.35;
}

/* Subtle Storybook Paper Texture Overlay */
.paper-grain-overlay {
  position: absolute;
  inset: 0;
  opacity: 0.035;
  background-image: radial-gradient(rgba(245, 238, 223, 0.5) 0.6px, transparent 0.6px);
  background-size: 16px 16px;
}

/* =========================================================================
   PRIMARY APPLICATION SHELL & HEADER
   ========================================================================= */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: 100%;
  position: relative;
  z-index: var(--z-content);
}

.site-header {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border-subtle);
  background: rgba(16, 20, 43, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: var(--z-header);
}

.site-header__container {
  max-width: var(--container-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  direction: ltr;
}

.site-header__brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  text-decoration: none;
}

.site-header__title {
  font-size: var(--font-size-sm);
  color: var(--color-soft-ivory);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-header__subtitle {
  font-family: var(--font-arabic);
  font-size: var(--font-size-xs);
  color: var(--color-warm-gold);
  opacity: 0.9;
}

.site-header__ornament {
  color: var(--color-warm-gold);
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

/* =========================================================================
   CINEMATIC OPENING HERO (Floating Storybook Scene)
   ========================================================================= */
.opening-hero {
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-md) var(--space-3xl);
  position: relative;
  text-align: center;
}

.opening-hero__inner {
  width: 100%;
  max-width: var(--container-scene);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.opening-hero__header {
  margin-bottom: var(--space-md);
}

.opening-book-stage {
  width: 100%;
  max-width: 640px;
  margin: 0 auto var(--space-lg);
  cursor: pointer;
  position: relative;
  border-radius: var(--radius-lg);
  transition: transform var(--transition-normal);
}

.opening-book-stage:hover {
  transform: translateY(-4px);
}

.opening-book-svg {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

.opening-hero__actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.open-story-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.95rem 2.2rem;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, rgba(25, 29, 58, 0.92), rgba(16, 20, 43, 0.96));
  border: 1.5px solid var(--color-warm-gold);
  color: var(--color-soft-ivory);
  box-shadow: 0 8px 28px rgba(16, 20, 43, 0.7), 0 0 22px rgba(232, 189, 117, 0.22);
  transition: all var(--transition-normal);
  direction: ltr;
}

.open-story-cta:hover {
  background: linear-gradient(135deg, rgba(232, 189, 117, 0.22), rgba(25, 29, 58, 0.95));
  box-shadow: 0 10px 34px rgba(16, 20, 43, 0.8), 0 0 32px rgba(232, 189, 117, 0.42);
  transform: translateY(-2px);
}

.open-story-cta__en {
  font-family: var(--font-latin);
  font-size: var(--font-size-sm);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-warm-gold);
  font-weight: 600;
}

.open-story-cta__divider {
  color: var(--color-warm-gold);
  font-size: 0.75rem;
  opacity: 0.8;
}

.open-story-cta__ar {
  font-family: var(--font-arabic);
  font-size: var(--font-size-base);
  color: var(--color-soft-ivory);
  font-weight: 500;
}

/* =========================================================================
   MAIN STORY JOURNEY CONTAINER
   ========================================================================= */
.story-main {
  flex: 1;
  width: 100%;
}

.story-journey-container {
  width: 100%;
  display: flex;
  flex-direction: column;
}

/* =========================================================================
   PERSISTENT CONSTELLATION NAVIGATION BAR
   ========================================================================= */
.story-navigation {
  position: sticky;
  bottom: 0;
  width: 100%;
  z-index: var(--z-navigation);
  background: rgba(16, 20, 43, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: var(--space-sm) var(--space-md);
  border-top: 1px solid var(--color-border-subtle);
}

.chapter-progress-track {
  width: 100%;
  height: 3px;
  background-color: rgba(220, 228, 242, 0.1);
  position: absolute;
  top: 0;
  left: 0;
}

.chapter-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-soft-moonlight), var(--color-warm-gold));
  width: 7.7%;
  transition: width var(--transition-normal);
}

.navigation-controls {
  max-width: var(--container-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.navigation-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  min-width: 0;
}

.constellation-dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  flex-wrap: nowrap;
}

.constellation-dot {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  padding: 0;
  transition: transform var(--transition-fast);
}

.constellation-dot__star {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-full);
  background-color: rgba(220, 228, 242, 0.28);
  border: 1px solid rgba(220, 228, 242, 0.4);
  transition: all var(--transition-fast);
}

.constellation-dot.is-visited .constellation-dot__star {
  background-color: rgba(232, 189, 117, 0.55);
  border-color: var(--color-warm-gold);
}

.constellation-dot.is-active .constellation-dot__star {
  width: 10px;
  height: 10px;
  background-color: var(--color-warm-gold);
  border-color: var(--color-soft-ivory);
  box-shadow: 0 0 10px var(--color-warm-gold);
}

.constellation-dot:hover .constellation-dot__star {
  transform: scale(1.3);
  border-color: var(--color-warm-gold);
}

.chapter-counter {
  font-family: var(--font-latin);
  font-size: var(--font-size-xs);
  color: var(--color-soft-moonlight);
  letter-spacing: 0.08em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 0.5rem 1.15rem;
  border: 1px solid var(--color-moon-border);
  background-color: var(--color-dark-indigo);
  color: var(--color-soft-ivory);
  border-radius: var(--radius-full);
  font-family: var(--font-latin);
  font-size: var(--font-size-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: all var(--transition-fast);
  user-select: none;
  flex-shrink: 0;
}

.nav-btn:hover:not(:disabled) {
  background-color: var(--color-indigo-soft);
  border-color: var(--color-warm-gold);
  color: var(--color-warm-gold);
}

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

/* =========================================================================
   SITE FOOTER
   ========================================================================= */
.site-footer {
  padding: var(--space-xl) var(--space-md);
  text-align: center;
  font-family: var(--font-latin);
  font-size: var(--font-size-xs);
  letter-spacing: 0.1em;
  color: var(--color-muted-lavender);
  border-top: 1px solid var(--color-border-subtle);
  background-color: rgba(11, 14, 31, 0.85);
}