/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@300;400;500;600;700&display=swap');

/* Modern CSS Custom Properties with Dark Mode Support */
:root {
  /* Light mode colors */
  --primary-navy: #0f172a;
  --primary-navy-light: #1e293b;
  --primary-navy-lighter: #334155;
  --primary-gold: #f59e0b;
  --primary-gold-light: #fbbf24;
  --primary-gold-dark: #d97706;
  
  /* Extended color palette */
  --accent-teal: #06b6d4;
  --accent-teal-light: #22d3ee;
  --accent-purple: #8b5cf6;
  --accent-purple-light: #a78bfa;
  --accent-green: #10b981;
  --accent-red: #ef4444;
  
  /* Neutral colors */
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  
  /* Semantic colors */
  --background-primary: var(--white);
  --background-secondary: var(--gray-50);
  --background-tertiary: var(--gray-100);
  --text-primary: var(--gray-900);
  --text-secondary: var(--gray-700);
  --text-tertiary: var(--gray-500);
  --border-primary: var(--gray-200);
  --border-secondary: var(--gray-300);
  
  /* Modern gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary-navy) 0%, var(--primary-navy-light) 50%, var(--accent-teal) 100%);
  --gradient-secondary: linear-gradient(135deg, var(--primary-gold) 0%, var(--primary-gold-light) 100%);
  --gradient-hero: linear-gradient(135deg, rgba(15,23,42,0.9) 0%, rgba(30,41,59,0.8) 50%, rgba(6,182,212,0.7) 100%);
  --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9) 0%, rgba(248,250,252,0.9) 100%);
  --gradient-glass: linear-gradient(145deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
  
  /* Typography */
  --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Space Grotesk', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Monaco', monospace;
  
  /* Fluid spacing scale */
  --space-3xs: clamp(0.25rem, 0.25rem + 0vw, 0.25rem);
  --space-2xs: clamp(0.5rem, 0.5rem + 0vw, 0.5rem);
  --space-xs: clamp(0.75rem, 0.75rem + 0vw, 0.75rem);
  --space-sm: clamp(1rem, 1rem + 0vw, 1rem);
  --space-md: clamp(1.25rem, 1.25rem + 0vw, 1.25rem);
  --space-lg: clamp(1.5rem, 1.5rem + 0.5vw, 2rem);
  --space-xl: clamp(2rem, 2rem + 1vw, 3rem);
  --space-2xl: clamp(2.5rem, 2.5rem + 1.5vw, 4rem);
  --space-3xl: clamp(3rem, 3rem + 2vw, 5rem);
  --space-4xl: clamp(4rem, 4rem + 3vw, 7rem);
  --space-5xl: clamp(5rem, 5rem + 5vw, 10rem);
  
  /* Enhanced 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);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 50px rgba(245, 158, 11, 0.3);
  --shadow-teal-glow: 0 0 50px rgba(6, 182, 212, 0.3);
  
  /* Modern border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 2rem;
  --radius-full: 9999px;
  
  /* Transition presets */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  
  /* Z-index scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;
}

/* Dark mode theme */
[data-theme="dark"] {
  --background-primary: var(--gray-900);
  --background-secondary: var(--gray-800);
  --background-tertiary: var(--gray-700);
  --text-primary: var(--white);
  --text-secondary: var(--gray-300);
  --text-tertiary: var(--gray-400);
  --border-primary: var(--gray-700);
  --border-secondary: var(--gray-600);
  
  --gradient-card: linear-gradient(145deg, rgba(30,41,59,0.9) 0%, rgba(15,23,42,0.9) 100%);
  --gradient-glass: linear-gradient(145deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
  --shadow-glow: 0 0 50px rgba(245, 158, 11, 0.2);
  --shadow-teal-glow: 0 0 50px rgba(6, 182, 212, 0.2);
}

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

html {
  font-size: 100%;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  tab-size: 4;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeSpeed;
  transition: color var(--transition-base), background-color var(--transition-base);
}

/* Enhanced focus styles */
*:focus-visible {
  outline: 2px solid var(--primary-gold);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Improved skip link */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-md);
  background: var(--primary-navy);
  color: var(--white);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 0.875rem;
  z-index: var(--z-toast);
  transition: top var(--transition-base);
  text-decoration: none;
  box-shadow: var(--shadow-xl);
}

.skip-link:focus {
  top: var(--space-md);
}

/* Dark Mode Toggle */
.theme-toggle {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: var(--z-fixed);
  background: var(--gradient-glass);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-full);
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-lg);
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-xl);
}

.theme-toggle svg {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--text-primary);
  transition: all var(--transition-base);
}

/* Layout Container */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Enhanced Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-base);
}

.site-header.scrolled {
  background: rgba(15, 23, 42, 0.95);
  box-shadow: var(--shadow-xl);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) 0;
  position: relative;
}

/* Logo Enhancement */
.logo {
  z-index: var(--z-fixed);
}

.logo a {
  font-family: var(--font-display);
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--white);
  text-decoration: none;
  letter-spacing: -0.025em;
  transition: all var(--transition-base);
  position: relative;
}

.logo a::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: var(--gradient-secondary);
  border-radius: var(--radius-lg);
  opacity: 0;
  z-index: -1;
  transition: opacity var(--transition-base);
}

.logo a:hover::before {
  opacity: 0.2;
}

.logo a:hover {
  transform: translateY(-1px);
  text-shadow: 0 0 20px rgba(245, 158, 11, 0.5);
}

/* Modern Navigation */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-md);
  align-items: center;
}

.main-nav a {
  position: relative;
  color: var(--white);
  font-weight: 500;
  font-size: 0.875rem;
  text-decoration: none;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  letter-spacing: 0.025em;
}

.main-nav a::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-glass);
  border-radius: var(--radius-lg);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.main-nav a:hover::before,
.main-nav a[aria-current="page"]::before {
  opacity: 1;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--primary-gold-light);
  transform: translateY(-1px);
  text-shadow: 0 0 10px rgba(245, 158, 11, 0.5);
}

/* Mobile Navigation */
.mobile-nav-toggle {
  display: none;
  background: var(--gradient-glass);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  width: 2.5rem;
  height: 2.5rem;
  cursor: pointer;
  transition: all var(--transition-base);
  z-index: var(--z-fixed);
}

.mobile-nav-toggle:hover {
  transform: scale(1.05);
  background: rgba(255, 255, 255, 0.1);
}

/* Enhanced Hero Section */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--primary-navy-light) 50%, var(--accent-teal) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='m36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(10px, -10px) rotate(1deg); }
  50% { transform: translate(-5px, 5px) rotate(-1deg); }
  75% { transform: translate(-10px, -5px) rotate(2deg); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
  max-width: 900px;
  padding: var(--space-3xl);
}

.hero-content h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  letter-spacing: -0.02em;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 1s ease-out 0.3s both;
}

.hero-content p {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  font-weight: 400;
  line-height: 1.6;
  margin-bottom: var(--space-2xl);
  opacity: 0.95;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 1s ease-out 0.6s both;
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 1s ease-out 0.9s both;
}

/* Enhanced Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-primary);
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn-primary {
  background: var(--gradient-secondary);
  color: var(--primary-navy);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-secondary {
  background: var(--gradient-glass);
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}

.btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-2xl);
}

.btn-primary:hover {
  box-shadow: var(--shadow-2xl), var(--shadow-glow);
}

/* Floating Elements */
.floating-elements {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.floating-element {
  position: absolute;
  background: var(--gradient-glass);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-2xl);
  backdrop-filter: blur(10px);
  animation: floatAround 15s ease-in-out infinite;
}

.floating-element:nth-child(1) {
  width: 100px;
  height: 100px;
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.floating-element:nth-child(2) {
  width: 150px;
  height: 150px;
  top: 60%;
  right: 15%;
  animation-delay: 3s;
}

.floating-element:nth-child(3) {
  width: 80px;
  height: 80px;
  bottom: 30%;
  left: 20%;
  animation-delay: 6s;
}

@keyframes floatAround {
  0%, 100% { transform: translate(0, 0) rotate(0deg); opacity: 0.3; }
  25% { transform: translate(30px, -30px) rotate(90deg); opacity: 0.6; }
  50% { transform: translate(-20px, 20px) rotate(180deg); opacity: 0.4; }
  75% { transform: translate(-40px, -10px) rotate(270deg); opacity: 0.7; }
}

/* Modern Content Sections */
.content-section {
  background: var(--background-primary);
  margin: var(--space-4xl) 0;
  padding: var(--space-4xl);
  border-radius: var(--radius-3xl);
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}

.content-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-secondary);
}

.content-section:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2xl);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Enhanced Project Cards */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-xl);
  margin: var(--space-3xl) 0;
}

.project-card {
  background: var(--gradient-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-2xl);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: var(--gradient-secondary);
  transition: left var(--transition-slow);
}

.project-card:hover::before {
  left: 0;
}

.project-card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: var(--shadow-2xl);
  border-color: var(--primary-gold);
}

.project-card.featured {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: var(--shadow-2xl), var(--shadow-teal-glow);
}

.project-card.featured .project-title,
.project-card.featured .project-meta {
  color: var(--white);
}

.project-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.project-meta {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

.project-tag {
  background: var(--gradient-glass);
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--primary-gold);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-base);
}

.project-link:hover {
  color: var(--primary-gold-dark);
  transform: translateX(4px);
}

/* Enhanced Footer */
.site-footer {
  background: var(--gradient-primary);
  color: var(--white);
  padding: var(--space-4xl) 0 var(--space-xl);
  margin-top: var(--space-5xl);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--gradient-secondary);
}

.footer-content {
  text-align: center;
}

.footer-text {
  font-size: 0.875rem;
  opacity: 0.8;
  margin-bottom: var(--space-md);
}

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

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

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .theme-toggle {
    top: var(--space-md);
    right: var(--space-md);
    width: 2.5rem;
    height: 2.5rem;
  }
  
  .mobile-nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 0 0 var(--radius-2xl) var(--radius-2xl);
    padding: var(--space-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }
  
  .main-nav.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .main-nav ul {
    flex-direction: column;
    gap: var(--space-md);
    width: 100%;
  }
  
  .main-nav a {
    display: block;
    text-align: center;
    padding: var(--space-md);
  }
  
  .hero-content {
    padding: var(--space-xl);
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 280px;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .content-section {
    margin: var(--space-2xl) 0;
    padding: var(--space-xl);
  }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.3);
    --shadow-2xl: 0 24px 48px rgba(0, 0, 0, 0.4);
  }
}

/* Print styles */
@media print {
  .theme-toggle,
  .mobile-nav-toggle,
  .floating-elements,
  .site-header,
  .site-footer {
    display: none !important;
  }
  
  .hero {
    height: auto;
    min-height: auto;
    background: none !important;
    color: var(--gray-900) !important;
  }
  
  .content-section {
    box-shadow: none;
    border: 1px solid var(--gray-300);
    break-inside: avoid;
  }
}