/* ============================================
   PYMTW — Book Landing Page
   Bitcoin for Working Professionals
   Matches main site dark theme
   ============================================ */

/* --- Variables (from main site) --- */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a2e;
  --bg-card-hover: #222240;
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b8;
  --text-muted: #6a6a80;
  --accent-orange: #f7931a;
  --accent-gold: #ffd700;
  --accent-amber: #ffb347;
  --gradient-start: #f7931a;
  --gradient-end: #ffd700;
  --gradient-alt: #ff6b00;
  --border-color: rgba(247, 147, 26, 0.15);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --glow-orange: rgba(247, 147, 26, 0.4);
  --glow-gold: rgba(255, 215, 0, 0.3);
  --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
}

/* --- Reset --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* --- Particles --- */
#bk-particles {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* --- Container --- */
.bk-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Utility --- */
.bk-gradient-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Nav --- */
.bk-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  background: rgba(10, 10, 15, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.bk-nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.bk-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
}

.bk-logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 10px;
  font-size: 1.2rem;
  font-weight: 800;
  color: #000;
}

.bk-logo-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.bk-nav-back {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.3s;
}
.bk-nav-back:hover { color: var(--text-primary); }

/* ========================
   HERO
   ======================== */
.bk-hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}

.bk-hero-content {
  flex: 1;
  max-width: 580px;
}

.bk-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 100px;
  background: rgba(247, 147, 26, 0.1);
  border: 1px solid rgba(247, 147, 26, 0.3);
  color: var(--accent-orange);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  margin-bottom: 28px;
  animation: bkFadeDown 0.8s ease;
}

.bk-badge-dot {
  width: 8px; height: 8px;
  background: var(--accent-orange);
  border-radius: 50%;
  animation: bkPulse 2s ease infinite;
}

.bk-hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.12;
  margin-bottom: 24px;
  animation: bkFadeUp 0.8s ease 0.1s both;
}

.bk-hero-sub {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 500px;
  animation: bkFadeUp 0.8s ease 0.2s both;
}

.bk-hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 36px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-alt));
  color: #000;
  font-weight: 700;
  font-size: 1.05rem;
  border-radius: var(--radius-xl);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 0 30px rgba(247, 147, 26, 0.3), 0 4px 15px rgba(0,0,0,0.3);
  animation: bkFadeUp 0.8s ease 0.3s both;
}
.bk-hero-cta:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 0 50px rgba(247, 147, 26, 0.5), 0 8px 25px rgba(0,0,0,0.3);
}
.bk-hero-cta svg {
  animation: bkBounceDown 2s ease infinite;
}

.bk-hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 32px;
  animation: bkFadeUp 0.8s ease 0.4s both;
}

.bk-proof-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.bk-proof-item svg {
  color: var(--accent-orange);
  flex-shrink: 0;
}

/* Hero visual — 3D Book */
.bk-hero-visual {
  flex: 0 0 380px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: bkFadeUp 1s ease 0.3s both;
}

.bk-book-wrapper {
  position: relative;
  perspective: 1200px;
}

.bk-book {
  position: relative;
  width: 260px;
  height: 360px;
  transform-style: preserve-3d;
  transform: rotateY(-18deg) rotateX(3deg);
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  animation: bkBookFloat 6s ease-in-out infinite;
}
.bk-book:hover {
  transform: rotateY(-8deg) rotateX(1deg);
}

.bk-book-front {
  position: absolute;
  width: 100%; height: 100%;
  backface-visibility: hidden;
  transform: translateZ(12px);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 4px 4px 30px rgba(0,0,0,0.5);
}

.bk-book-cover {
  width: 100%; height: 100%;
  background: linear-gradient(160deg, #1a1a2e 0%, #0d0d1a 40%, #12121a 100%);
  border: 1px solid rgba(247, 147, 26, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 30px 24px;
  position: relative;
  overflow: hidden;
}

.bk-book-cover::before {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at 30% 20%, rgba(247, 147, 26, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.bk-book-cover::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
}

.bk-book-tag {
  position: absolute;
  top: 16px; right: -8px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-alt));
  color: #000;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  padding: 4px 14px 4px 10px;
  border-radius: 3px 0 0 3px;
}

.bk-book-icon {
  font-size: 2.8rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  opacity: 0.5;
}

.bk-book-title-text {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
  line-height: 1.4;
  letter-spacing: 1px;
  color: var(--text-secondary);
}
.bk-book-title-text strong {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 0.5px;
}

.bk-book-author {
  margin-top: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

.bk-book-footer {
  position: absolute;
  bottom: 14px;
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 1px;
  opacity: 0.5;
}

.bk-book-spine {
  position: absolute;
  left: -11px; top: 0;
  width: 24px; height: 100%;
  background: linear-gradient(180deg, #1a1a2e, #0d0d1a);
  transform: rotateY(90deg) translateZ(0px);
  transform-origin: right;
  border-radius: 2px 0 0 2px;
}

.bk-book-back {
  position: absolute;
  width: 100%; height: 100%;
  background: #0d0d1a;
  transform: translateZ(-12px);
  border-radius: var(--radius-md);
}

.bk-book-shadow {
  position: absolute;
  bottom: -30px;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 20px;
  background: radial-gradient(ellipse, rgba(247, 147, 26, 0.15) 0%, transparent 70%);
  filter: blur(10px);
  animation: bkBookFloat 6s ease-in-out infinite reverse;
}

/* Floating badges */
.bk-float-badge {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  backdrop-filter: blur(10px);
  white-space: nowrap;
}

.bk-float-emoji { font-size: 1.1rem; }

.bk-float-1 {
  top: 20px; right: -40px;
  animation: bkFloatBadge 5s ease-in-out infinite;
}
.bk-float-2 {
  bottom: 80px; left: -50px;
  animation: bkFloatBadge 5s ease-in-out 1.5s infinite;
}
.bk-float-3 {
  bottom: 10px; right: -30px;
  animation: bkFloatBadge 5s ease-in-out 3s infinite;
}

/* ========================
   SHARED SECTION STYLES
   ======================== */
.bk-section-tag {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(247, 147, 26, 0.1);
  border: 1px solid rgba(247, 147, 26, 0.2);
  color: var(--accent-orange);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.bk-section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 56px;
}

/* ========================
   WHO IT'S FOR
   ======================== */
.bk-who {
  position: relative;
  z-index: 1;
  padding: 100px 0 80px;
}

.bk-who-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.bk-who-card {
  padding: 36px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
  position: relative;
}

.bk-who-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-orange), transparent);
  opacity: 0;
  transition: opacity 0.4s;
}

.bk-who-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}
.bk-who-card:hover::before { opacity: 1; }

.bk-who-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  background: rgba(247, 147, 26, 0.08);
  border: 1px solid rgba(247, 147, 26, 0.15);
  border-radius: 14px;
  color: var(--accent-orange);
  margin-bottom: 20px;
}

.bk-who-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.3;
}

.bk-who-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================
   CHAPTERS
   ======================== */
.bk-chapters {
  position: relative;
  z-index: 1;
  padding: 80px 0 100px;
}

.bk-chapters-layout {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

.bk-part-label {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-orange);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 20px;
  padding-left: 4px;
}

.bk-chapter-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.bk-chapter-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 24px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.bk-chapter-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-color);
  transform: translateX(4px);
}

.bk-chapter-highlight {
  background: linear-gradient(135deg, rgba(247, 147, 26, 0.08), rgba(255, 215, 0, 0.04));
  border-color: rgba(247, 147, 26, 0.2);
}

.bk-ch-num {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--accent-orange);
  opacity: 0.6;
  min-width: 28px;
  padding-top: 2px;
}

.bk-chapter-item h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
  line-height: 1.3;
}

.bk-chapter-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================
   BIO
   ======================== */
.bk-bio {
  position: relative;
  z-index: 1;
  padding: 100px 0;
}

.bk-bio-inner {
  display: flex;
  gap: 60px;
  align-items: flex-start;
}

.bk-bio-avatar {
  flex-shrink: 0;
  position: relative;
  width: 120px; height: 120px;
}

.bk-avatar-ring {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  animation: bkSpin 8s linear infinite;
  mask: radial-gradient(circle, transparent 55px, black 56px);
  -webkit-mask: radial-gradient(circle, transparent 55px, black 56px);
}

.bk-avatar-placeholder {
  width: 100%; height: 100%;
  border-radius: 50%;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-orange);
  position: relative;
  z-index: 1;
}

.bk-bio-name {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 24px;
}

.bk-bio-text p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.bk-bio-text strong {
  color: var(--text-primary);
}

/* ========================
   CTA
   ======================== */
.bk-cta {
  position: relative;
  z-index: 1;
  padding: 80px 0 100px;
  text-align: center;
}

.bk-cta-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
}

.bk-cta-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

.bk-cta-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.bk-buy-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 36px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-alt));
  color: #000;
  font-weight: 700;
  font-size: 1.05rem;
  border-radius: var(--radius-xl);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 0 30px rgba(247, 147, 26, 0.3), 0 4px 15px rgba(0,0,0,0.3);
}
.bk-buy-btn:hover {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 0 50px rgba(247, 147, 26, 0.5), 0 8px 25px rgba(0,0,0,0.3);
}

.bk-secondary-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  background: transparent;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}
.bk-secondary-btn:hover {
  border-color: var(--accent-orange);
  background: rgba(247, 147, 26, 0.05);
  transform: translateY(-2px);
}

/* ========================
   FOOTER
   ======================== */
.bk-footer {
  position: relative;
  z-index: 1;
  padding: 40px 0;
  border-top: 1px solid var(--border-subtle);
}

.bk-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.bk-footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
}

.bk-footer-links {
  display: flex;
  gap: 24px;
}
.bk-footer-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color 0.3s;
}
.bk-footer-links a:hover { color: var(--text-primary); }

.bk-footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ========================
   ANIMATIONS
   ======================== */
@keyframes bkFadeDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes bkFadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes bkPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

@keyframes bkBounceDown {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(4px); }
}

@keyframes bkBookFloat {
  0%, 100% { transform: rotateY(-18deg) rotateX(3deg) translateY(0); }
  50% { transform: rotateY(-18deg) rotateX(3deg) translateY(-12px); }
}

@keyframes bkFloatBadge {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes bkSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ========================
   SCROLL ANIMATIONS
   ======================== */
.bk-reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.bk-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================
   RESPONSIVE
   ======================== */
@media (max-width: 900px) {
  .bk-hero {
    flex-direction: column;
    text-align: center;
    padding-top: 100px;
    gap: 40px;
  }
  .bk-hero-content { max-width: 100%; }
  .bk-hero-sub { margin-left: auto; margin-right: auto; }
  .bk-hero-proof { justify-content: center; }

  .bk-hero-visual { flex: none; }
  .bk-float-badge { display: none; }

  .bk-who-grid {
    grid-template-columns: 1fr;
  }

  .bk-bio-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

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

@media (max-width: 600px) {
  .bk-hero-title {
    font-size: 2rem;
  }

  .bk-section-title {
    font-size: 1.7rem;
  }

  .bk-book {
    width: 200px;
    height: 280px;
  }

  .bk-chapter-item {
    padding: 20px 20px;
    gap: 14px;
  }

  .bk-cta-buttons {
    flex-direction: column;
  }
}