/* ============================================================
   FEUILLE DE STYLE PRINCIPALE — LE GÈNE DE QIN
   Auteur : Franck PLATON | Promotion Amazon KDP 2026
   Architecture : CSS Variables, Flexbox, CSS Grid, Mobile-First
   ============================================================ */

/* 1. VARIABLES CENTRALISÉES (PERSONNALISATION FACILE) */
:root {
  /* Palette Chromatique (Thème Glaciaire & Obsidienne) */
  --color-bg-dark: #0A0A0C;
  --color-bg-card: #14161C;
  --color-bg-card-hover: #1E212B;
  --color-accent-cyan: #00F0FF;
  --color-accent-blue: #0D74FF;
  --color-text-main: #E2E8F0;
  --color-text-muted: #94A3B8;
  --color-border: rgba(255, 255, 255, 0.12);
  --color-accent-glow: rgba(0, 240, 255, 0.25);

  /* Typographie */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Merriweather', Georgia, serif;
  --font-display: 'Cinzel', 'Times New Roman', serif;

  /* Dimensions & Espacements */
  --container-max: 1200px;
  --header-height: 72px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  /* Transitions & Animations */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s ease;
}

/* 2. RESET & BASE */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--color-bg-dark);
  color: var(--color-text-main);
  font-family: var(--font-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul {
  list-style: none;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.container {
  width: 90%;
  max-width: var(--container-max);
  margin: 0 auto;
}

.font-serif {
  font-family: var(--font-serif);
}

/* 3. NAVIGATION FIXE */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(10, 10, 12, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.navbar {
  width: 90%;
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo a {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: #FFFFFF;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.nav-links a:hover {
  color: var(--color-accent-cyan);
}

.nav-cta {
  background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-cyan));
  color: #0A0A0C !important;
  font-weight: 700 !important;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px var(--color-accent-glow);
}

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

.burger-menu span {
  width: 26px;
  height: 2px;
  background-color: var(--color-text-main);
  transition: var(--transition-fast);
}

/* 4. HERO SECTION (S1) */
.hero-section {
  position: relative;
  min-height: 92vh;
  padding-top: calc(var(--header-height) + 3rem);
  padding-bottom: 4rem;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  z-index: 1;
}

.hero-container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-accent-cyan);
  background-color: rgba(0, 240, 255, 0.1);
  padding: 0.35rem 0.85rem;
  border-radius: 50px;
  border: 1px solid rgba(0, 240, 255, 0.3);
  margin-bottom: 1.25rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.1;
  color: #FFFFFF;
  letter-spacing: 1px;
  margin-bottom: 0.75rem;
}

.hero-author {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.accent-text {
  color: #FFFFFF;
}

.hero-tagline {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-style: italic;
  color: var(--color-text-main);
  border-left: 3px solid var(--color-accent-cyan);
  padding-left: 1rem;
  margin-bottom: 2rem;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-size: 1rem;
  font-weight: 700;
  padding: 0.95rem 1.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-cyan));
  color: #0A0A0C;
}

.btn-glow:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px var(--color-accent-glow);
}

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.4);
}

.icon-svg {
  width: 18px;
  height: 18px;
}

.hero-features {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.feature-badge {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.04);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* 5. VISUEL COUVERTURE & MOCKUP */
.book-mockup-wrapper {
  position: relative;
  display: flex;
  justify-content: center;
}

.book-cover-img {
  width: 280px;
  border-radius: var(--radius-md);
  box-shadow: -15px 25px 50px rgba(0, 0, 0, 0.8), 0 0 40px rgba(0, 240, 255, 0.15);
  transition: transform 0.5s ease;
}

.book-cover-img:hover {
  transform: scale(1.03) rotateY(-5deg);
}

/* 6. EN-TÊTES DE SECTION */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 3.5rem auto;
}

.section-subtitle {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--color-accent-cyan);
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1.25;
}

.title-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-blue), var(--color-accent-cyan));
  margin: 1.25rem auto;
  border-radius: 2px;
}

.section-description {
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

/* 7. SECTION SYNOPSIS (S2) */
.synopsis-section {
  padding: 6rem 0;
  background-color: var(--color-bg-dark);
}

.synopsis-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: start;
  margin-bottom: 3.5rem;
}

.synopsis-text p {
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
  color: var(--color-text-main);
  text-align: justify;
}

.lead-para {
  font-size: 1.15rem !important;
  color: #FFFFFF !important;
  border-left: 2px solid var(--color-accent-cyan);
  padding-left: 1.25rem;
}

.synopsis-highlights {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.highlight-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.highlight-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 240, 255, 0.4);
}

.highlight-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background-color: rgba(0, 240, 255, 0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-cyan);
}

.highlight-icon svg {
  width: 22px;
  height: 22px;
}

.highlight-content h3 {
  font-size: 1.1rem;
  color: #FFFFFF;
  margin-bottom: 0.35rem;
}

.highlight-content p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.synopsis-quote {
  background: linear-gradient(135deg, rgba(20, 22, 28, 0.9), rgba(13, 116, 255, 0.1));
  border-left: 4px solid var(--color-accent-cyan);
  padding: 2rem 2.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-top: 2rem;
}

.synopsis-quote p {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-style: italic;
  color: #FFFFFF;
  margin-bottom: 0.75rem;
}

.synopsis-quote cite {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-style: normal;
  font-weight: 600;
}

/* 8. SECTION PERSONNAGES (S3) */
.characters-section {
  padding: 6rem 0;
  background-color: #0E0F14;
}

.characters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.character-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.character-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.6);
  border-color: rgba(0, 240, 255, 0.35);
}

.char-img-container {
  position: relative;
  height: 260px;
  overflow: hidden;
}

.char-img-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.character-card:hover .char-img-container img {
  transform: scale(1.08);
}

.char-badge {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: rgba(10, 10, 12, 0.85);
  color: var(--color-accent-cyan);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 0.35rem 0.8rem;
  border-radius: 4px;
  border: 1px solid rgba(0, 240, 255, 0.3);
}

.char-info {
  padding: 1.75rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.char-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: #FFFFFF;
  margin-bottom: 0.25rem;
}

.char-role {
  font-size: 0.85rem;
  color: var(--color-accent-cyan);
  font-weight: 600;
  margin-bottom: 1rem;
}

.char-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.char-quote {
  background-color: rgba(255, 255, 255, 0.03);
  border-left: 2px solid rgba(255, 255, 255, 0.2);
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
}

.char-quote p {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  font-style: italic;
  color: var(--color-text-main);
}

.char-more-btn {
  color: var(--color-accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  text-align: left;
  margin-top: auto;
}

.char-secret {
  margin-top: 1rem;
  padding: 1rem;
  background-color: rgba(0, 240, 255, 0.06);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: #FFFFFF;
}

/* 9. SECTION EXTRAIT (S4) */
.excerpt-section {
  padding: 6rem 0;
  background: radial-gradient(circle at center, #161822 0%, var(--color-bg-dark) 100%);
}

.excerpt-box {
  max-width: 820px;
  margin: 0 auto;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 3rem 3.5rem;
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.excerpt-header-deco {
  text-align: center;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 4px;
  color: var(--color-text-muted);
  margin-bottom: 2.25rem;
}

.excerpt-content p {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-text-main);
  text-align: justify;
}

.excerpt-content p:first-of-type::first-letter {
  font-family: var(--font-display);
  font-size: 3.5rem;
  float: left;
  line-height: 1;
  padding-right: 0.75rem;
  color: var(--color-accent-cyan);
}

.excerpt-footer {
  text-align: center;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

/* 10. SECTION UNIVERS & CHRONOLOGIE (S5) */
.universe-section {
  padding: 6rem 0;
  background-color: var(--color-bg-dark);
}

.timeline-interactive {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.timeline-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.5rem;
  margin-bottom: 2.5rem;
}

.timeline-btn {
  flex: 1;
  min-width: 160px;
  padding: 1rem;
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  text-align: left;
  transition: all var(--transition-fast);
}

.timeline-btn:hover, .timeline-btn.active {
  background-color: rgba(0, 240, 255, 0.1);
  border-color: var(--color-accent-cyan);
}

.node-year {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent-cyan);
  margin-bottom: 0.25rem;
}

.node-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: #FFFFFF;
}

.timeline-panels {
  position: relative;
  min-height: 300px;
}

.timeline-panel {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2.5rem;
  align-items: center;
}

.panel-image img {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  max-height: 320px;
  width: 100%;
  object-fit: cover;
}

.panel-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent-cyan);
  letter-spacing: 2px;
  margin-bottom: 0.75rem;
  display: block;
}

.panel-content h3 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: #FFFFFF;
  margin-bottom: 1rem;
}

.panel-content p {
  color: var(--color-text-main);
  margin-bottom: 1.5rem;
  font-size: 1rem;
}

.panel-fact {
  background-color: rgba(255, 255, 255, 0.04);
  border-left: 3px solid var(--color-accent-blue);
  padding: 1rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* 11. SECTION AUTEUR (S6) */
.author-section {
  padding: 6rem 0;
  background-color: #0E0F14;
}

.author-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 3.5rem;
  align-items: start;
}

.author-photo img {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  margin-bottom: 1.25rem;
}

.author-socials {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

.author-socials a {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.author-socials a:hover {
  color: var(--color-accent-cyan);
  border-color: var(--color-accent-cyan);
}

.author-bio h3 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  color: #FFFFFF;
  margin-bottom: 1.25rem;
}

.author-bio p {
  margin-bottom: 1.25rem;
  color: var(--color-text-main);
  font-size: 1.05rem;
}

.cross-promo {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}

.cross-promo h4 {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.promo-books {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.promo-book-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--color-bg-card);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.promo-book-item img {
  width: 45px;
  border-radius: 4px;
}

.promo-book-item strong {
  display: block;
  font-size: 0.95rem;
  color: #FFFFFF;
}

.promo-book-item span {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* 12. SECTION CTA FINAL (S7) */
.final-cta-section {
  padding: 6rem 0;
  background: linear-gradient(180deg, var(--color-bg-dark) 0%, #11141E 100%);
  border-top: 1px solid var(--color-border);
}

.final-cta-container {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 4rem;
  align-items: center;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 3.5rem;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
}

.final-cover-img {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: -10px 15px 35px rgba(0, 0, 0, 0.7);
}

.cta-badge {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--color-accent-cyan);
  display: block;
  margin-bottom: 0.5rem;
}

.cta-content h2 {
  font-family: var(--font-display);
  font-size: 2.75rem;
  color: #FFFFFF;
  margin-bottom: 0.75rem;
}

.cta-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-main);
  margin-bottom: 2rem;
}

.cta-pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.price-box {
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  text-align: center;
}

.active-price {
  background-color: rgba(0, 240, 255, 0.08);
  border-color: var(--color-accent-cyan);
}

.format-name {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.format-price {
  display: block;
  font-size: 1.35rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.25rem;
}

.format-info {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.btn-cta-large {
  width: 100%;
  padding: 1.2rem;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.cta-note {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 0.85rem;
}

/* 13. FOOTER (S8) */
.site-footer {
  background-color: #070709;
  border-top: 1px solid var(--color-border);
  padding: 3rem 0;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.35rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-badge {
  font-size: 0.75rem;
  background-color: rgba(255, 255, 255, 0.06);
  color: var(--color-text-muted);
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
}

/* 14. ANIMATIONS DE SCROLL-REVEAL */
.fade-in-on-load {
  animation: fadeInLoad 1s ease forwards;
}

@keyframes fadeInLoad {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.scroll-reveal {
  opacity: 0;
  transform: translateY(35px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* 15. RESPONSIVE DESIGN (MOBILE & TABLETTE) */
@media (max-width: 992px) {
  .hero-container,
  .synopsis-grid,
  .author-grid,
  .final-cta-container,
  .timeline-panel {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-title {
    font-size: 2.75rem;
  }

  .cta-pricing-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: rgba(10, 10, 12, 0.96);
    flex-direction: column;
    padding: 2rem;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links.nav-open {
    display: flex;
  }

  .burger-menu {
    display: flex;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .excerpt-box,
  .final-cta-container {
    padding: 2rem 1.5rem;
  }

  .footer-container {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}