/* Modern Design System - 2025 Trends */

:root {
  /* Color Palette */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --dark-gradient: linear-gradient(135deg, #0c0c0c 0%, #1a1a1a 100%);
  
  /* Neutral Colors */
  --white: #ffffff;
  --gray-50: #fafafa;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
  --gray-900: #171717;
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-base: 0.2s ease-out;
  --transition-slow: 0.3s ease-out;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--gray-800);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* Hero Section */
.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
  min-height: 100vh;
  padding: var(--space-20) 0;
  position: relative;
}

.hero-content {
  z-index: 2;
}

.logo-container {
  margin-bottom: var(--space-6);
}

.logo {
  width: 60px;
  height: 60px;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--space-6);
  line-height: 1.1;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--space-8);
  font-weight: 400;
  line-height: 1.6;
}

.cta-buttons {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  font-size: var(--font-size-base);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--white);
  color: var(--gray-800);
  box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--white);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.hero-visual {
  position: relative;
  z-index: 1;
}

.floating-graphic {
  width: 100%;
  height: auto;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

/* Main Content */
main {
  background: var(--white);
  border-radius: var(--radius-2xl);
  margin-top: var(--space-16);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
}

/* Section Styling */
.projects-section,
.technologies-section {
  padding: var(--space-20) var(--space-8);
}

.technologies-section {
  background: linear-gradient(135deg, var(--gray-50) 0%, var(--gray-100) 100%);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-header h2 {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-4);
}

.section-header p {
  font-size: var(--font-size-xl);
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-8);
}

.project-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-200);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.project-card:hover::before {
  transform: scaleX(1);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--gray-300);
}

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-gradient);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  color: var(--white);
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.project-card h3 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--space-3);
}

.project-card p {
  color: var(--gray-600);
  margin-bottom: var(--space-6);
  line-height: 1.6;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tech-tag {
  background: var(--gray-100);
  color: var(--gray-700);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

/* Technology Logos */
.tech-logos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-8);
  max-width: 600px;
  margin: 0 auto;
}

.tech-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-4);
}

.tech-logo svg {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base);
}

.tech-logo:hover svg {
  transform: scale(1.1);
}

.tech-logo span {
  font-weight: 600;
  color: var(--gray-700);
}

/* Footer */
.footer {
  background: var(--gray-900);
  color: var(--white);
  padding: var(--space-16) var(--space-8) var(--space-8);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-section h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-4);
  color: var(--white);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--space-2);
}

.footer-section a {
  color: var(--gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid var(--gray-800);
  padding-top: var(--space-8);
  text-align: center;
  color: var(--gray-400);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-section {
    grid-template-columns: 1fr;
    gap: var(--space-12);
    text-align: center;
    padding: var(--space-16) 0;
  }
  
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-3);
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .projects-section,
  .technologies-section {
    padding: var(--space-16) var(--space-4);
  }
  
  .section-header h2 {
    font-size: var(--font-size-3xl);
  }
  
  .section-header p {
    font-size: var(--font-size-lg);
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .btn-primary,
  .btn-secondary {
    width: 100%;
    max-width: 300px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-section {
    padding: var(--space-12) 0;
  }
  
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-base);
  }
  
  .project-card {
    padding: var(--space-6);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

/* Scroll animations */
@media (prefers-reduced-motion: no-preference) {
  .project-card,
  .tech-logo {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease-out forwards;
  }
  
  .project-card:nth-child(1) { animation-delay: 0.1s; }
  .project-card:nth-child(2) { animation-delay: 0.2s; }
  .project-card:nth-child(3) { animation-delay: 0.3s; }
  .project-card:nth-child(4) { animation-delay: 0.4s; }
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Ledger-specific card styling */
.project-card[data-project="ledger-threekit-ai"] {
  background: linear-gradient(135deg, #000000 0%, #1a1a1a 100%);
  border-color: #333333;
  color: white;
}

.project-card[data-project="ledger-threekit-ai"]::before {
  background: linear-gradient(90deg, #ff6600 0%, #ff8533 100%);
}

.project-card[data-project="ledger-threekit-ai"]:hover {
  background: linear-gradient(135deg, #1a1a1a 0%, #000000 100%);
  border-color: #ff6600;
  box-shadow: 0 20px 40px rgba(255, 102, 0, 0.15);
}

.project-card[data-project="ledger-threekit-ai"] .card-icon.ledger-card {
  background: linear-gradient(135deg, #ff6600 0%, #ff8533 100%);
  color: white;
}

.project-card[data-project="ledger-threekit-ai"] h3 {
  color: white;
}

.project-card[data-project="ledger-threekit-ai"] p {
  color: #cccccc;
}

.project-card[data-project="ledger-threekit-ai"] .tech-tag {
  background: rgba(255, 102, 0, 0.2);
  color: #ff8533;
  border: 1px solid #ff6600;
}