/* ============================================================
   THE AUTONOMOUS BUSINESS — Book Promotional Site
   Design System: Editorial Luxury meets Tech Authority
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400;1,500&family=Outfit:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- CSS Variables --- */
:root {
  /* Palette */
  --obsidian: #0a0a0f;
  --charcoal: #111118;
  --slate: #1a1a24;
  --graphite: #24243a;
  --steel: #3a3a52;
  --silver: #9a9ab0;
  --pearl: #d0d0e0;
  --white: #f0eff4;
  --cyan: #00e5ff;
  --cyan-dim: #00e5ff22;
  --cyan-mid: #00e5ff44;
  --cyan-glow: #00e5ff15;
  --amber: #ffb800;
  --coral: #ff4d3a;

  /* Typography */
  --font-display: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-body: 'Outfit', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Type Scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.75rem;
  --text-5xl: 3.5rem;
  --text-6xl: 4.5rem;
  --text-7xl: 6rem;

  /* Spacing */
  --sp-xs: 0.25rem;
  --sp-sm: 0.5rem;
  --sp-md: 1rem;
  --sp-lg: 1.5rem;
  --sp-xl: 2rem;
  --sp-2xl: 3rem;
  --sp-3xl: 4rem;
  --sp-4xl: 6rem;
  --sp-5xl: 8rem;

  /* Borders & Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --border: 1px solid rgba(255,255,255,0.06);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  line-height: 1.7;
  color: var(--pearl);
  background: var(--obsidian);
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--cyan); text-decoration: none; transition: all 0.3s ease; }
a:hover { color: var(--white); }
::selection { background: var(--cyan); color: var(--obsidian); }

/* --- Layout --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--sp-xl); }
.container--narrow { max-width: 800px; }
.container--wide { max-width: 1400px; }
.section { padding: var(--sp-5xl) 0; position: relative; }
.section--dark { background: var(--charcoal); }
.section--slate { background: var(--slate); }

/* --- Typography --- */
h1, h2, h3, h4, h5 { font-family: var(--font-display); line-height: 1.15; color: var(--white); font-weight: 400; }
h1 { font-size: var(--text-6xl); letter-spacing: -0.02em; }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
.display { font-family: var(--font-display); font-style: italic; font-weight: 500; }
.label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--cyan);
  display: inline-block;
}
.label--rule {
  display: flex; align-items: center; gap: var(--sp-md);
}
.label--rule::before, .label--rule::after {
  content: ''; height: 1px; width: 40px; background: var(--cyan-mid);
}
.text-silver { color: var(--silver); }
.text-cyan { color: var(--cyan); }
.text-center { text-align: center; }

/* --- Prose (for book excerpts) --- */
.prose {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  line-height: 1.85;
  color: var(--pearl);
  max-width: 680px;
  margin: 0 auto;
}
.prose p { margin-bottom: var(--sp-lg); text-indent: 1.5em; }
.prose p:first-child { text-indent: 0; }
.prose p:first-child::first-letter {
  font-size: 3.5em;
  float: left;
  line-height: 0.8;
  margin-right: 0.08em;
  margin-top: 0.08em;
  color: var(--cyan);
  font-weight: 600;
}
.prose .separator {
  text-align: center;
  text-indent: 0;
  margin: var(--sp-2xl) 0;
  color: var(--silver);
  font-size: var(--text-lg);
  letter-spacing: 0.5em;
}
.prose--compact { font-size: var(--text-lg); }

/* --- Navigation --- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: transparent;
  transition: all 0.4s ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(10,10,15,0.92);
  backdrop-filter: blur(20px);
  border-bottom-color: rgba(255,255,255,0.05);
}
.nav__inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--sp-lg) var(--sp-xl);
  transition: padding 0.4s ease;
}
.nav.scrolled .nav__inner { padding: var(--sp-md) var(--sp-xl); }
.nav__brand {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--silver);
  transition: color 0.3s;
}
.nav__brand:hover { color: var(--white); }
.nav__brand span { color: var(--cyan); }
.nav__links { display: flex; align-items: center; gap: var(--sp-xl); }
.nav__link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 400;
  color: var(--silver);
  letter-spacing: 0.04em;
  transition: color 0.3s;
  position: relative;
}
.nav__link:hover { color: var(--white); }
.nav__link.active { color: var(--cyan); }
.nav__cta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--cyan);
  color: var(--obsidian);
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: all 0.3s;
}
.nav__cta:hover { background: var(--white); color: var(--obsidian); transform: translateY(-1px); }
.nav__mobile { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav__mobile span { display: block; width: 22px; height: 2px; background: var(--silver); margin: 5px 0; transition: 0.3s; }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: var(--sp-sm);
  font-family: var(--font-body); font-weight: 600;
  font-size: var(--text-base);
  padding: 16px 36px; border-radius: var(--radius-sm);
  transition: all 0.35s ease; cursor: pointer; border: none;
  text-decoration: none;
}
.btn--primary {
  background: var(--cyan); color: var(--obsidian);
  box-shadow: 0 0 30px var(--cyan-dim);
}
.btn--primary:hover {
  background: var(--white); color: var(--obsidian);
  box-shadow: 0 0 40px rgba(255,255,255,0.15);
  transform: translateY(-2px);
}
.btn--outline {
  background: transparent; color: var(--white);
  border: 1px solid rgba(255,255,255,0.2);
}
.btn--outline:hover {
  border-color: var(--cyan); color: var(--cyan);
  box-shadow: 0 0 20px var(--cyan-dim);
}
.btn--large { padding: 20px 48px; font-size: var(--text-lg); }
.btn--sm { padding: 10px 20px; font-size: var(--text-sm); }
.btn .arrow { transition: transform 0.3s; }
.btn:hover .arrow { transform: translateX(4px); }
.btn--amazon { background: #FF9900; color: #111; font-weight: 700; }
.btn--amazon:hover { background: #FFB340; color: #111; transform: translateY(-2px); }

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex; align-items: center;
  position: relative; overflow: hidden;
  padding-top: 120px;
}
.hero__bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(ellipse 60% 50% at 30% 40%, rgba(0,229,255,0.04) 0%, transparent 70%),
    radial-gradient(ellipse 40% 60% at 80% 60%, rgba(0,229,255,0.03) 0%, transparent 70%),
    linear-gradient(180deg, var(--obsidian) 0%, var(--charcoal) 50%, var(--obsidian) 100%);
}
.hero__grid {
  position: absolute; inset: 0; z-index: 1; opacity: 0.3;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
}
.hero__content {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1fr 400px; gap: var(--sp-4xl);
  align-items: center;
}
.hero__text { max-width: 640px; }
.hero__eyebrow {
  font-family: var(--font-mono); font-size: var(--text-xs);
  text-transform: uppercase; letter-spacing: 0.2em;
  color: var(--cyan); margin-bottom: var(--sp-xl);
  display: flex; align-items: center; gap: var(--sp-md);
}
.hero__eyebrow::before { content: ''; width: 40px; height: 1px; background: var(--cyan); }
.hero__title {
  font-size: var(--text-7xl); line-height: 0.95;
  margin-bottom: var(--sp-lg); letter-spacing: -0.03em;
}
.hero__title em {
  font-style: italic; color: var(--cyan);
  font-weight: 500;
}
.hero__subtitle {
  font-family: var(--font-display);
  font-size: var(--text-2xl); font-weight: 300;
  color: var(--silver); line-height: 1.5;
  margin-bottom: var(--sp-md);
}
.hero__meta {
  font-size: var(--text-sm); color: var(--steel);
  margin-bottom: var(--sp-2xl);
}
.hero__actions { display: flex; gap: var(--sp-md); flex-wrap: wrap; align-items: center; }
.hero__cover {
  position: relative;
}
.hero__cover-img {
  width: 100%; max-width: 380px;
  border-radius: var(--radius-md);
  box-shadow:
    0 40px 80px rgba(0,0,0,0.5),
    0 0 60px var(--cyan-dim),
    0 0 1px rgba(255,255,255,0.1);
  transition: transform 0.6s ease;
}
.hero__cover:hover .hero__cover-img { transform: translateY(-8px) rotateY(-2deg); }
.hero__cover-glow {
  position: absolute; inset: -40px; z-index: -1;
  background: radial-gradient(ellipse at center, var(--cyan-dim) 0%, transparent 70%);
  filter: blur(40px);
}

/* --- Stats Bar --- */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: var(--border); border-bottom: var(--border);
  background: rgba(255,255,255,0.01);
}
.stat {
  padding: var(--sp-2xl) var(--sp-xl); text-align: center;
  border-right: var(--border);
}
.stat:last-child { border-right: none; }
.stat__number {
  font-family: var(--font-display);
  font-size: var(--text-4xl); font-weight: 600;
  color: var(--white);
  margin-bottom: 4px;
}
.stat__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs); text-transform: uppercase;
  letter-spacing: 0.15em; color: var(--steel);
}

/* --- Book Content / Chapters --- */
.toc { list-style: none; counter-reset: chapter; }
.toc__part {
  font-family: var(--font-mono);
  font-size: var(--text-xs); text-transform: uppercase;
  letter-spacing: 0.2em; color: var(--cyan);
  margin: var(--sp-2xl) 0 var(--sp-md);
  padding-bottom: var(--sp-sm);
  border-bottom: 1px solid var(--cyan-mid);
}
.toc__part:first-child { margin-top: 0; }
.toc__item {
  counter-increment: chapter;
  padding: var(--sp-md) 0;
  border-bottom: var(--border);
  display: flex; align-items: baseline; gap: var(--sp-lg);
  transition: all 0.3s;
  cursor: default;
}
.toc__item:hover { padding-left: var(--sp-sm); }
.toc__item::before {
  content: counter(chapter, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--steel);
  min-width: 28px;
}
.toc__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--pearl);
  flex: 1;
}
.toc__item:hover .toc__title { color: var(--white); }
.toc__badge {
  font-family: var(--font-mono);
  font-size: 10px; text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border-radius: 3px;
  background: var(--cyan-dim);
  color: var(--cyan);
}

/* --- Excerpt Card --- */
.excerpt-card {
  background: var(--charcoal);
  border: var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.4s;
}
.excerpt-card:hover {
  border-color: rgba(0,229,255,0.15);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.excerpt-card__header {
  padding: var(--sp-xl) var(--sp-2xl);
  border-bottom: var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.excerpt-card__chapter {
  font-family: var(--font-mono);
  font-size: var(--text-xs); text-transform: uppercase;
  letter-spacing: 0.15em; color: var(--cyan);
}
.excerpt-card__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl); color: var(--white);
  margin-top: 4px;
}
.excerpt-card__body {
  padding: var(--sp-2xl);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  line-height: 1.85;
  color: var(--pearl);
}
.excerpt-card__body p { margin-bottom: var(--sp-lg); }
.excerpt-card__fade {
  position: relative;
}
.excerpt-card__fade::after {
  content: '';
  position: absolute; bottom: 0; left: 0; right: 0;
  height: 120px;
  background: linear-gradient(transparent, var(--charcoal));
  pointer-events: none;
}
.excerpt-card__footer {
  padding: var(--sp-lg) var(--sp-2xl) var(--sp-2xl);
  display: flex; align-items: center; justify-content: space-between;
}

/* --- Blockquote / Pull Quote --- */
.pullquote {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-style: italic;
  font-weight: 400;
  color: var(--white);
  line-height: 1.4;
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  padding: var(--sp-3xl) 0;
}
.pullquote::before {
  content: '\201C';
  font-size: 8rem;
  position: absolute;
  top: -20px; left: 50%; transform: translateX(-50%);
  color: var(--cyan);
  opacity: 0.2;
  line-height: 1;
  font-family: var(--font-display);
}
.pullquote__source {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-style: normal;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--steel);
  margin-top: var(--sp-lg);
  display: block;
}

/* --- Author Section --- */
.author-card {
  display: grid; grid-template-columns: 200px 1fr;
  gap: var(--sp-3xl); align-items: start;
}
.author-card__photo {
  width: 200px; height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--graphite);
  background: var(--graphite);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-size: var(--text-5xl);
  color: var(--silver);
}
.author-card__name {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  color: var(--white);
  margin-bottom: var(--sp-sm);
}
.author-card__title {
  font-family: var(--font-mono);
  font-size: var(--text-xs); text-transform: uppercase;
  letter-spacing: 0.15em; color: var(--cyan);
  margin-bottom: var(--sp-xl);
}
.author-card__bio {
  color: var(--silver);
  line-height: 1.8;
  font-size: var(--text-lg);
}
.author-card__bio p { margin-bottom: var(--sp-lg); }

/* --- Purchase Section --- */
.purchase-grid {
  display: grid; grid-template-columns: 1fr 1fr 1fr;
  gap: var(--sp-xl);
}
.purchase-option {
  background: var(--charcoal);
  border: var(--border);
  border-radius: var(--radius-lg);
  padding: var(--sp-2xl);
  text-align: center;
  transition: all 0.4s;
  position: relative;
}
.purchase-option:hover {
  border-color: rgba(0,229,255,0.2);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.purchase-option--featured {
  border-color: var(--cyan-mid);
  background: linear-gradient(135deg, var(--charcoal), rgba(0,229,255,0.03));
}
.purchase-option__badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  font-family: var(--font-mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.1em;
  background: var(--cyan); color: var(--obsidian);
  padding: 4px 16px; border-radius: 20px; font-weight: 700;
}
.purchase-option__format {
  font-family: var(--font-mono);
  font-size: var(--text-xs); text-transform: uppercase;
  letter-spacing: 0.15em; color: var(--silver);
  margin-bottom: var(--sp-md);
}
.purchase-option__price {
  font-family: var(--font-display);
  font-size: var(--text-4xl); font-weight: 600;
  color: var(--white);
  margin-bottom: var(--sp-xl);
}
.purchase-option__price span { font-size: var(--text-lg); color: var(--silver); }

/* --- Footer --- */
.footer {
  background: var(--obsidian);
  border-top: var(--border);
  padding: var(--sp-4xl) 0 var(--sp-2xl);
}
.footer__top {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--sp-3xl);
  padding-bottom: var(--sp-3xl);
  border-bottom: var(--border);
}
.footer__brand-name {
  font-family: var(--font-mono);
  font-size: var(--text-xs); text-transform: uppercase;
  letter-spacing: 0.15em; color: var(--silver);
  margin-bottom: var(--sp-md);
}
.footer__brand-name span { color: var(--cyan); }
.footer__desc { color: var(--steel); font-size: var(--text-sm); line-height: 1.7; }
.footer__col-title {
  font-family: var(--font-mono); font-size: var(--text-xs);
  text-transform: uppercase; letter-spacing: 0.15em;
  color: var(--silver); margin-bottom: var(--sp-lg);
}
.footer__link {
  display: block; color: var(--steel);
  font-size: var(--text-sm); margin-bottom: var(--sp-sm);
  transition: color 0.3s;
}
.footer__link:hover { color: var(--white); }
.footer__bottom {
  padding-top: var(--sp-2xl);
  display: flex; justify-content: space-between; align-items: center;
  font-size: var(--text-xs); color: var(--steel);
}

/* --- Animations --- */
.fade-up {
  opacity: 0; transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.fade-up.visible { opacity: 1; transform: none; }
.stagger > * { opacity: 0; transform: translateY(30px); transition: all 0.7s cubic-bezier(0.16, 1, 0.3, 1); }
.stagger > *:nth-child(1) { transition-delay: 0.05s; }
.stagger > *:nth-child(2) { transition-delay: 0.12s; }
.stagger > *:nth-child(3) { transition-delay: 0.19s; }
.stagger > *:nth-child(4) { transition-delay: 0.26s; }
.stagger > *:nth-child(5) { transition-delay: 0.33s; }
.stagger > *:nth-child(6) { transition-delay: 0.40s; }
.stagger.visible > * { opacity: 1; transform: none; }

/* --- Divider --- */
.divider {
  width: 60px; height: 1px;
  background: var(--cyan-mid);
  margin: var(--sp-2xl) auto;
}
.divider--left { margin-left: 0; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  h1, .hero__title { font-size: var(--text-5xl); }
  .hero__content { grid-template-columns: 1fr; text-align: center; }
  .hero__cover { display: flex; justify-content: center; order: -1; margin-bottom: var(--sp-2xl); }
  .hero__cover-img { max-width: 280px; }
  .hero__actions { justify-content: center; }
  .hero__eyebrow { justify-content: center; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .purchase-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .author-card { grid-template-columns: 1fr; text-align: center; justify-items: center; }
  .footer__top { grid-template-columns: 1fr 1fr; gap: var(--sp-2xl); }
}
@media (max-width: 768px) {
  h1, .hero__title { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }
  .section { padding: var(--sp-4xl) 0; }
  .hero { padding-top: 100px; }
  .nav__links { display: none; }
  .nav__mobile { display: block; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat { padding: var(--sp-lg); }
  .footer__top { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; gap: var(--sp-md); text-align: center; }
  .pullquote { font-size: var(--text-2xl); }
}