:root {
  /* Color Palette - Modern Corporate & Energetic Sales */
  --color-primary: #0052FF; /* Trustworthy Blue */
  --color-secondary: #00C853; /* Success Green */
  --color-accent: #FFD600; /* Energy Yellow */
  --color-dark: #0F172A;
  --color-light: #F8FAFC;
  --color-gray: #64748B;
  --color-border: #E2E8F0;
  --color-white: #FFFFFF;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Typography */
  --font-main: 'Outfit', system-ui, -apple-system, sans-serif;
  --font-display: 'Syne', sans-serif;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--color-light);
  color: var(--color-dark);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 4rem);
}

section {
  margin-top: var(--space-2xl);
  padding: var(--space-lg) 0;
}

main > :first-child {
  margin-top: 0;
}

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.1;
  text-transform: uppercase;
}

h1 { font-size: clamp(2.5rem, 8vw, 5rem); }
h2 { font-size: clamp(2rem, 5vw, 3.5rem); margin-bottom: var(--space-md); }
h3 { font-size: 1.75rem; margin-bottom: var(--space-sm); }

.text-gradient {
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Navigation */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
  height: 80px;
  display: flex;
  align-items: center;
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--color-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--color-dark);
  font-weight: 600;
  font-size: 0.9rem;
  transition: color 0.3s;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  border-radius: 50px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s;
  cursor: pointer;
  border: none;
  font-family: var(--font-main);
  text-transform: uppercase;
  letter-spacing: 1px;
}

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

.btn-primary:hover {
  background-color: var(--color-dark);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0, 82, 255, 0.2);
}

.btn-outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* Hero Section */
.hero {
  padding-top: 160px;
  padding-bottom: var(--space-xl);
  background: radial-gradient(circle at top right, rgba(0, 82, 255, 0.05), transparent),
              radial-gradient(circle at bottom left, rgba(0, 200, 83, 0.05), transparent);
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-xl);
  align-items: center;
}

.hero-content p {
  font-size: 1.25rem;
  color: var(--color-gray);
  margin-bottom: var(--space-lg);
  max-width: 600px;
}

.hero-meta {
  display: flex;
  gap: 2rem;
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background: var(--color-white);
  border-radius: 1rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--color-border);
}

.meta-item {
  display: flex;
  flex-direction: column;
}

.meta-label {
  font-size: 0.75rem;
  color: var(--color-gray);
  text-transform: uppercase;
  font-weight: 700;
}

.meta-value {
  font-weight: 700;
  color: var(--color-dark);
}

/* Placeholders */
.placeholder-image {
  background: #E2E8F0;
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16/9;
}

.placeholder-image::after {
  content: attr(data-label);
  color: #94A3B8;
  font-weight: 600;
  font-size: 0.875rem;
}

/* Event Card Visualization */
.event-visual-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  width: 100%;
}

.visual-box {
  background: white;
  padding: 1.5rem;
  border-radius: 1.5rem;
  border: 1px solid var(--color-border);
  box-shadow: 0 10px 30px rgba(0,0,0,0.03);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.visual-box.full {
  grid-column: span 2;
}

.visual-box.accent {
  background: var(--color-primary);
  color: white;
  border: none;
}

.visual-box h4 {
  font-size: 0.9rem;
  margin: 0;
  opacity: 0.9;
}

.visual-box .stat {
  font-size: 2.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1;
}

.visual-box .tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: rgba(0,0,0,0.05);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 700;
}

.accent .tag {
  background: rgba(255,255,255,0.2);
}

.floating-icon {
  width: 40px;
  height: 40px;
  background: var(--color-secondary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  margin-bottom: 0.5rem;
}

.placeholder-image.square { aspect-ratio: 1/1; }
.placeholder-image.portrait { aspect-ratio: 3/4; }
.placeholder-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: #E2E8F0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Info Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-md);
}

.card {
  background: var(--color-white);
  padding: var(--space-lg);
  border-radius: 1.5rem;
  border: 1px solid var(--color-border);
  transition: transform 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--color-primary);
}

/* Program Section */
.program-tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: var(--space-lg);
}

.tab-btn {
  padding: 0.75rem 2rem;
  border-radius: 50px;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  font-weight: 700;
  cursor: pointer;
}

.tab-btn.active {
  background: var(--color-dark);
  color: var(--color-white);
  border-color: var(--color-dark);
}

.program-row {
  display: grid;
  grid-template-columns: 120px 1fr 1fr;
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  align-items: center;
}

.program-time {
  font-weight: 800;
  color: var(--color-primary);
}

.program-track {
  font-size: 0.875rem;
  color: var(--color-gray);
  text-transform: uppercase;
}

/* Speakers Section */
.speaker-card {
  text-align: center;
}

.speaker-card .placeholder-avatar {
  margin: 0 auto var(--space-md);
  width: 160px;
  height: 160px;
}

/* Partner Grid */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-lg);
  align-items: center;
  opacity: 0.6;
}

/* Newsletter Section */
.newsletter {
  background: var(--color-dark);
  color: var(--color-white);
  padding: var(--space-xl) 0;
  border-radius: 3rem;
  margin-bottom: var(--space-xl);
}

.newsletter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.form-group {
  display: flex;
  gap: 1rem;
}

.form-input {
  flex: 1;
  padding: 1rem 1.5rem;
  border-radius: 50px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
}

/* Footer */
footer {
  background: var(--color-white);
  padding: var(--space-xl) 0 var(--space-md);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-2xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-bottom {
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--color-gray);
}

@media (max-width: 768px) {
  .hero-grid, .newsletter-grid, .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .program-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .nav-links {
    display: none;
  }
}