:root {
  /* Brand Colors - Purple & Violet (Synced with aixvista.com) */
  --bg-primary: #F5F5F5;         /* Light Gray - Clean & Modern */
  --bg-secondary: #FFFFFF;       /* Pure White */
  --text-primary: #1A1A2E;       /* Dark Navy - High Contrast */
  --text-secondary: #333333;     /* Dark Gray - Readable */
  
  /* Accents */
  --accent-primary: #6E48AA;     /* Vivid Purple */
  --accent-secondary: #9D50BB;   /* Bright Violet */
  --accent-blue: #4776E6;        /* Modern Blue */
  --accent-soft: rgba(110, 72, 170, 0.05); /* Very Soft Purple */
  --success-color: #2ECC71;      /* Fresh Green */
  --gradient-brand: linear-gradient(135deg, #6E48AA 0%, #9D50BB 100%);
  --accent-glow: 0 0 20px rgba(110, 72, 170, 0.3);

  /* Typography */
  --font-sans: 'Inter', -apple-system, sans-serif;
  --font-heading: 'Outfit', sans-serif;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-4: 1rem;
  --space-8: 2rem;
  --space-12: 3.5rem;
  --space-16: 5rem;
  --space-24: 8rem;

  /* Borders & Radius */
  --radius-md: 0.75rem;
  --radius-lg: 1.5rem;
  --border-subtle: 1px solid rgba(49, 46, 129, 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Typography Hierarchy - Optimized for Semantics & AI Scannability */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.1;
  margin-bottom: var(--space-4);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

h1 {
  font-size: clamp(3rem, 6vw, 4.5rem);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: clamp(2.25rem, 4vw, 3rem);
  margin-top: var(--space-12);
}

h3 {
  font-size: 1.75rem;
  margin-top: var(--space-8);
}

p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin-bottom: var(--space-4);
  max-width: 75ch; /* Optimal reading length */
}

/* Quotable Definition Blocks */
.definition-block {
  background: var(--bg-secondary);
  border-left: 4px solid var(--accent-primary);
  padding: var(--space-8) var(--space-8);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--space-8) 0;
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* Structured Bullet Insights */
ul, ol {
  margin-bottom: var(--space-8);
  padding-left: var(--space-8);
  color: var(--text-secondary);
}

li {
  margin-bottom: var(--space-2);
  font-size: 1.125rem;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-8);
}

/* Header & Nav */
header {
  padding: var(--space-8) 0;
  border-bottom: var(--border-subtle);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-secondary);
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.5rem;
  text-decoration: none;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.header-cta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  margin-left: var(--space-8);
  transition: color 0.2s;
  font-weight: 500;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
}

.btn-primary {
  background: var(--gradient-brand);
  color: white;
  border: none;
}

.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(110, 72, 170, 0.4);
}

/* Hero Section - Split Screen */
.hero-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 80vh;
  align-items: center;
  gap: 0;
  overflow: hidden;
  background: var(--bg-secondary);
}

.hero-left, .hero-right {
  padding: var(--space-16);
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100%;
}

.hero-left {
  background: var(--accent-soft);
  filter: blur(2px) grayscale(0.5);
  opacity: 0.7;
  transition: all 0.5s ease;
}

.hero-left:hover {
  filter: blur(0) grayscale(0);
  opacity: 1;
}

.hero-right {
  background: var(--gradient-brand);
  border-left: var(--border-subtle);
  position: relative;
  color: white;
}

.hero-right h1, .hero-right p {
  color: white;
}

.hero-right h1 {
  text-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.hero-right .btn-primary {
  background: white;
  color: var(--accent-primary);
}

.hero-right::after {
  content: 'CITED';
  position: absolute;
  top: var(--space-8);
  right: var(--space-8);
  background: var(--success-color);
  color: white;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 2rem;
  letter-spacing: 0.1em;
}

.hero-content {
  max-width: 500px;
  margin: 0 auto;
}

/* Citation Scroll (Marquee) */
.citation-ticker {
  background: var(--accent-primary);
  color: #ffffff;
  padding: var(--space-4) 0;
  overflow: hidden;
  white-space: nowrap;
  position: relative;
}

.ticker-content {
  display: inline-block;
  animation: ticker 30s linear infinite;
  font-family: var(--font-sans);
  font-weight: 500;
  font-style: italic;
  font-size: 0.9rem;
  opacity: 0.9;
}

.ticker-item {
  display: inline-block;
  padding: 0 var(--space-12);
}

.ticker-item span {
  color: #FFFFFF;
  font-weight: 700;
  margin-right: 0.5rem;
  border-bottom: 2px solid rgba(255,255,255,0.3);
}

.ticker-item.verified span {
  color: var(--success-color);
}

@keyframes ticker {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.hero p {
  margin: 0 auto var(--space-8);
  font-size: 1.25rem;
}

/* Grid Layouts for Sections */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--space-12);
  margin: var(--space-12) 0;
}

/* Cards */
.card {
  background: var(--bg-secondary);
  border: var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 30px rgba(110, 72, 170, 0.15);
  border-color: var(--accent-primary);
}

/* Footer - Minimalist Massive Whitespace */
footer {
  padding: var(--space-24) 0 var(--space-16);
  margin-top: var(--space-24);
  text-align: center;
  background: var(--bg-secondary);
}

.footer-cta {
  margin-bottom: var(--space-16);
}

.footer-cta h2 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: var(--space-8);
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: var(--accent-primary);
}

.copyright {
  font-size: 0.8rem;
  color: var(--text-secondary);
  opacity: 0.6;
}

/* Embed Forms / Call to Action */
.contact-form {
  background: var(--bg-secondary);
  padding: var(--space-12);
  border-radius: var(--radius-lg);
  border: var(--border-subtle);
  max-width: 600px;
  margin: var(--space-12) auto;
}

.contact-form input, .contact-form textarea {
  width: 100%;
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  background: var(--bg-primary);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
}

.contact-form input:focus, .contact-form textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
}

/* Scroll Animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease-out;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* AI Readiness Section */
.ai-readiness {
  padding: var(--space-24) 0;
  background: #1A1A2E;
  color: white;
  overflow: hidden;
}

.ai-readiness-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--space-12);
}

.ai-readiness img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.ai-readiness h2 {
  color: white;
  margin-top: 0;
}

.ai-readiness p {
  color: rgba(255,255,255,0.8);
}

@media (max-width: 968px) {
  .ai-readiness-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}