/* ===== CSS VARIABLES & THEME ===== */
:root {
  --color-bg: #0A0E27;
  --color-bg-alt: #141A3A;
  --color-bg-card: rgba(20, 26, 58, 0.6);
  --color-surface: rgba(40, 50, 90, 0.4);
  --color-primary: #00E5FF;
  --color-primary-light: #4DFFFF;
  --color-secondary: #FF3CAC;
  --color-accent: #784BA0;
  --color-accent-light: #B48CFF;
  --color-glow: #00E5FF;
  --color-glow-alt: #FF3CAC;
  --color-text: #E0E7FF;
  --color-text-muted: #9CA3D9;
  --color-text-dim: #5A6099;
  --color-border: rgba(0, 229, 255, 0.2);
  --color-border-light: rgba(120, 75, 160, 0.15);
  --gradient-hero: linear-gradient(135deg, #0A0E27 0%, #1A1F4A 30%, #2D1B4A 60%, #0A0E27 100%);
  --gradient-accent: linear-gradient(135deg, #00E5FF, #784BA0, #FF3CAC);
  --gradient-glow: linear-gradient(135deg, rgba(0, 229, 255, 0.3), rgba(255, 60, 172, 0.15));
  --gradient-card: linear-gradient(145deg, rgba(40, 50, 90, 0.5), rgba(20, 26, 58, 0.8));
  --shadow-glow: 0 0 30px rgba(0, 229, 255, 0.25), 0 0 60px rgba(255, 60, 172, 0.15);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.05);
  --shadow-3d: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px rgba(0, 229, 255, 0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Space Grotesk', 'Inter', sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

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

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

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

a:hover {
  color: var(--color-primary-light);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

ul, ol {
  list-style: none;
}

/* ===== CONTAINER ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== HERO SECTION ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--gradient-hero);
}

#heroCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 0%, rgba(10, 14, 39, 0.4) 70%, rgba(10, 14, 39, 0.85) 100%);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 40px 24px;
  max-width: 900px;
  animation: fadeInUp 1.2s ease-out;
}

.hero-badge {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 50px;
  background: var(--gradient-glow);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-primary-light);
  margin-bottom: 32px;
  animation: pulseGlow 3s ease-in-out infinite;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.title-line {
  display: block;
}

.gradient-text {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 40px rgba(0, 229, 255, 0.3);
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: var(--color-text-muted);
  margin-bottom: 40px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #0A0E27;
  box-shadow: 0 4px 20px rgba(0, 229, 255, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 229, 255, 0.6), 0 8px 30px rgba(255, 60, 172, 0.3);
  color: #0A0E27;
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 229, 255, 0.3);
}

.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  animation: bounce 2s ease-in-out infinite;
}

.scroll-indicator span {
  font-size: 0.75rem;
  color: var(--color-text-dim);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--color-primary);
  border-bottom: 2px solid var(--color-primary);
  transform: rotate(45deg);
  opacity: 0.6;
}

/* ===== TABLE OF CONTENTS ===== */
.toc-container {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 39, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.toc-desktop {
  display: none;
}

.toc-inner {
  padding: 16px 0;
}

.toc-inner h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-text-dim);
  margin-bottom: 12px;
  font-family: var(--font-heading);
}

.toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.toc-list li a {
  display: block;
  padding: 8px 16px;
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: var(--transition);
  white-space: nowrap;
}

.toc-list li a:hover,
.toc-list li a.active {
  color: var(--color-text);
  background: var(--color-surface);
  box-shadow: inset 0 0 10px rgba(0, 229, 255, 0.1);
}

.toc-list li a.active {
  background: var(--gradient-glow);
  border: 1px solid var(--color-border);
  color: var(--color-primary-light);
}

.toc-mobile-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 16px 24px;
  background: transparent;
  border: none;
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-body);
}

.toc-mobile-toggle svg {
  transition: var(--transition);
}

.toc-mobile-toggle[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.toc-mobile {
  padding: 0 24px 16px;
}

.toc-mobile .toc-list {
  flex-direction: column;
  gap: 2px;
}

.toc-mobile .toc-list li a {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
}

/* ===== PROCESS SECTION ===== */
.process-section {
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}

.process-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  text-align: center;
  margin-bottom: 12px;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.01em;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin-bottom: 60px;
}

.process-steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  perspective: 1000px;
}

.process-step {
  flex: 0 0 auto;
  width: 160px;
  text-align: center;
  padding: 24px 16px;
  border-radius: var(--radius-lg);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  transition: var(--transition-slow);
  opacity: 0;
  transform: translateY(40px) rotateX(10deg);
  box-shadow: var(--shadow-card);
}

.process-step.visible {
  opacity: 1;
  transform: translateY(0) rotateX(0);
}

.process-step:hover {
  transform: translateY(-8px) scale(1.05);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow), var(--shadow-3d);
}

.step-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-primary-light);
  transition: var(--transition);
}

.process-step:hover .step-icon {
  background: var(--gradient-glow);
  border-color: var(--color-primary);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
}

.step-icon svg {
  width: 32px;
  height: 32px;
}

.process-step h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
  font-family: var(--font-heading);
}

.process-step p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.process-connector {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 60px;
  flex-shrink: 0;
  position: relative;
}

.connector-line {
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-border), var(--color-primary), var(--color-secondary), var(--color-border));
  position: relative;
}

.connector-arrow {
  position: absolute;
  right: -6px;
  top: -4px;
  width: 0;
  height: 0;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left: 8px solid var(--color-secondary);
}

/* ===== ARTICLE ===== */
.article-wrapper {
  padding: 80px 0;
}

.article-content {
  max-width: 800px;
  margin: 0 auto;
}

.article-content section {
  margin-bottom: 64px;
  padding-top: 40px;
}

.article-content h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--color-text);
  position: relative;
  padding-bottom: 16px;
  letter-spacing: -0.01em;
}

.article-content h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--gradient-accent);
  border-radius: 3px;
}

.article-content h3 {
  font-size: clamp(1.15rem, 2.5vw, 1.4rem);
  font-weight: 600;
  margin: 32px 0 16px;
  color: var(--color-primary-light);
  font-family: var(--font-heading);
}

.article-content p {
  margin-bottom: 20px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.article-content a {
  color: var(--color-primary);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.article-content a:hover {
  border-bottom-color: var(--color-primary);
  text-shadow: 0 0 8px rgba(0, 229, 255, 0.3);
  color: var(--color-primary-light);
}

.article-content ul {
  margin: 20px 0;
  padding-left: 24px;
}

.article-content ul li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--color-text-muted);
  font-size: 1rem;
}

.article-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 8px var(--color-primary);
}

.article-content ul li strong {
  color: var(--color-text);
}

.key-takeaway {
  margin: 32px 0;
  padding: 24px 28px;
  border-radius: var(--radius-lg);
  background: var(--gradient-card);
  border-left: 4px solid var(--color-primary);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-card);
}

.key-takeaway h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--color-primary);
  margin-bottom: 8px;
  font-family: var(--font-heading);
}

.key-takeaway p {
  color: var(--color-text);
  font-size: 1rem;
  margin-bottom: 0;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.comparison-card {
  text-align: center;
  padding: 24px 16px;
  border-radius: var(--radius-md);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
  transition: var(--transition);
}

.comparison-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.lifespan-number {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
  font-family: var(--font-heading);
}

.lifespan-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

/* ===== CTA SECTION ===== */
.cta-section {
  padding: 80px 0;
  position: relative;
}

.cta-card {
  position: relative;
  padding: 48px 32px;
  border-radius: var(--radius-xl);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(20px);
  text-align: center;
  overflow: hidden;
  box-shadow: var(--shadow-3d);
}

.cta-glow {
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.2) 0%, rgba(255, 60, 172, 0.1) 50%, transparent 70%);
  pointer-events: none;
  animation: pulseGlow 4s ease-in-out infinite;
}

.cta-card h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  margin-bottom: 12px;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.01em;
}

.cta-card > p {
  color: var(--color-text-muted);
  margin-bottom: 32px;
  font-size: 1.05rem;
}

.cta-details {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  margin-bottom: 32px;
}

.cta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.cta-item svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

.cta-item a {
  color: var(--color-text);
}

.cta-item a:hover {
  color: var(--color-primary);
}

.cta-socials {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 32px;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: var(--transition);
}

.social-link:hover {
  background: var(--gradient-glow);
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.4), 0 8px 24px rgba(255, 60, 172, 0.2);
}

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

/* ===== FOOTER ===== */
.site-footer {
  padding: 32px 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.site-footer p {
  color: var(--color-text-dim);
  font-size: 0.85rem;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulseGlow {
  0%, 100% {
    opacity: 0.6;
    transform: translateX(-50%) scale(1);
  }
  50% {
    opacity: 1;
    transform: translateX(-50%) scale(1.1);
  }
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

/* ===== RESPONSIVE ===== */
@media (min-width: 768px) {
  .toc-desktop {
    display: block;
  }

  .toc-mobile-toggle {
    display: none;
  }

  .toc-mobile {
    display: none !important;
  }

  .process-steps {
    flex-wrap: nowrap;
  }

  .process-step {
    width: 140px;
  }

  .process-connector {
    width: 30px;
  }

  .hero-content {
    padding: 60px 24px;
  }

  .article-content h2 {
    font-size: 2rem;
  }
}

@media (min-width: 1024px) {
  .toc-container {
    position: sticky;
  }

  .toc-list {
    justify-content: center;
  }

  .process-step {
    width: 160px;
  }

  .process-connector {
    width: 40px;
  }
}

@media (max-width: 767px) {
  .hero {
    min-height: 90vh;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .btn-primary, .btn-secondary {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .scroll-indicator {
    bottom: 24px;
  }

  .process-steps {
    flex-direction: column;
    align-items: center;
  }

  .process-connector {
    width: 40px;
    height: 30px;
    transform: rotate(90deg);
  }

  .process-step {
    width: 100%;
    max-width: 280px;
  }

  .cta-details {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  .comparison-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .process-step {
    opacity: 1;
    transform: none;
  }
}

/* ===== FOCUS STYLES ===== */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ===== UTILITY ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}