/* ===========================================
   Modern Website Styles for Milton Abe
   Clean, Professional, AI-Focused Design
   =========================================== */

/* CSS Variables for consistent theming */
:root {
  /* Colors */
  --primary-color: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1d4ed8;
  --secondary-color: #06b6d4;
  --accent-color: #f59e0b;
  --success-color: #10b981;
  
  /* Neutrals */
  --white: #ffffff;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-ai: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* 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;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--gray-700);
  background-color: var(--white);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  color: var(--gray-900);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
  color: var(--gray-600);
  font-size: 1.125rem;
  line-height: 1.7;
}

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

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

/* Layout Components */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-3xl) 0;
}

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

.section-title {
  position: relative;
  display: inline-block;
  margin-bottom: var(--spacing-md);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: var(--radius-sm);
}

.section-subtitle {
  font-size: 1.25rem;
  color: var(--gray-500);
  font-weight: var(--font-weight-medium);
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
  z-index: 1000;
  transition: all var(--transition-normal);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.nav-brand {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--gray-900);
}

.brand-tagline {
  font-size: 0.875rem;
  color: var(--primary-color);
  font-weight: var(--font-weight-medium);
}

.nav-menu {
  display: flex;
  gap: var(--spacing-xl);
}

.nav-link {
  font-weight: var(--font-weight-medium);
  color: var(--gray-600);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
  background-color: var(--gray-50);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--gray-600);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

/* Language Switcher */
.language-switcher {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  margin-left: var(--spacing-lg);
}

.lang-btn {
  background: transparent;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  padding: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.7;
}

.lang-btn:hover {
  opacity: 1;
  transform: translateY(-2px);
}

.lang-btn.active {
  opacity: 1;
  border-color: var(--primary-color);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

.lang-btn svg {
  display: block;
  width: 30px;
  height: 20px;
  border-radius: 2px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: var(--gradient-ai);
  opacity: 0.05;
  border-radius: 0 0 0 100px;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  position: relative;
  z-index: 1;
}

.hero-title {
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xl);
  color: var(--gray-600);
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--gray-500);
  font-weight: var(--font-weight-medium);
}

/* AI Animation */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.ai-animation {
  width: 300px;
  height: 300px;
  position: relative;
}

.ai-node {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: 50%;
  position: absolute;
  box-shadow: var(--shadow-lg);
  animation: float 3s ease-in-out infinite;
}

.ai-node:nth-child(1) {
  top: 50px;
  left: 50px;
  animation-delay: 0s;
}

.ai-node:nth-child(2) {
  top: 50px;
  right: 50px;
  animation-delay: 1s;
}

.ai-node:nth-child(3) {
  bottom: 50px;
  left: 50%;
  transform: translateX(-50%);
  animation-delay: 2s;
}

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

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  transition: all var(--transition-normal);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  font-size: 1rem;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

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

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

.btn-secondary:hover {
  background: var(--primary-color);
  color: var(--white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* About Section */
.about {
  background: var(--gray-50);
}

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

.about-intro {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-xl);
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}

.about-photo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--primary-color);
  flex-shrink: 0;
}

.about-intro h3 {
  margin-bottom: var(--spacing-xs);
  color: var(--gray-900);
}

.role {
  color: var(--primary-color);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-xs);
}

.location {
  color: var(--gray-500);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.about-description {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.highlight {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal);
}

.highlight:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.highlight i {
  font-size: 1.5rem;
  color: var(--primary-color);
  width: 30px;
  text-align: center;
}

.highlight h4 {
  margin-bottom: var(--spacing-xs);
  font-size: 1rem;
}

.highlight p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--gray-600);
}

/* Expertise Section */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

.expertise-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
}

.expertise-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

.card-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
}

.card-icon i {
  font-size: 1.5rem;
  color: var(--white);
}

.expertise-card h3 {
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

.expertise-card p {
  margin-bottom: var(--spacing-lg);
  color: var(--gray-600);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.tech-tags span {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--gray-100);
  color: var(--gray-700);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
}

/* AI Workflow */
.ai-workflow {
  background: var(--white);
  padding: var(--spacing-3xl);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
}

.workflow-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  color: var(--gray-900);
}

.workflow-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.workflow-step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: 1.25rem;
  margin: 0 auto var(--spacing-md);
  box-shadow: var(--shadow-md);
}

.workflow-step h4 {
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

.workflow-step p {
  font-size: 0.95rem;
  color: var(--gray-600);
}

/* Experience Section */
.experience {
  background: var(--gray-50);
}

.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 100px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--primary-color);
}

.timeline-item {
  display: flex;
  margin-bottom: var(--spacing-3xl);
  position: relative;
}

.timeline-date {
  width: 150px;
  flex-shrink: 0;
  font-weight: var(--font-weight-semibold);
  color: var(--primary-color);
  font-size: 0.9rem;
  text-align: right;
  padding-right: var(--spacing-lg);
  position: relative;
}

.timeline-date::after {
  content: '';
  position: absolute;
  right: -6px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--primary-color);
  border-radius: 50%;
  border: 3px solid var(--white);
  box-shadow: var(--shadow-sm);
}

.timeline-content {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-left: var(--spacing-lg);
  flex: 1;
  transition: transform var(--transition-normal);
}

.timeline-content:hover {
  transform: translateX(10px);
  box-shadow: var(--shadow-md);
}

.timeline-content h3 {
  color: var(--gray-900);
  margin-bottom: var(--spacing-xs);
}

.timeline-content h4 {
  color: var(--primary-color);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
}

.timeline-content ul {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-lg);
}

.timeline-content li {
  margin-bottom: var(--spacing-sm);
  color: var(--gray-600);
}

.project-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.project-highlights span {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--gray-700);
}

.project-highlights i {
  color: var(--primary-color);
}

/* Contact Section */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: all var(--transition-normal);
  border: 1px solid var(--gray-200);
}

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

.contact-card i {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.contact-card h3 {
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
  font-size: 1.125rem;
}

.contact-card a {
  color: var(--primary-color);
  font-weight: var(--font-weight-semibold);
  font-size: 1.125rem;
}

.contact-card .note {
  display: block;
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-top: var(--spacing-sm);
}

.contact-cta {
  background: var(--white);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.contact-cta h3 {
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

.contact-cta p {
  margin-bottom: var(--spacing-xl);
  color: var(--gray-600);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
}

.social-links a {
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.social-links a:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
}

/* Footer */
.footer {
  background: var(--gray-900);
  color: var(--gray-400);
  text-align: center;
  padding: var(--spacing-xl) 0;
}

.footer p {
  margin: 0;
  font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;
    --spacing-3xl: 2.5rem;
  }
  
  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-xl);
  }
  
  .hero-visual {
    order: -1;
  }
  
  .ai-animation {
    width: 200px;
    height: 200px;
  }
  
  .ai-node {
    width: 40px;
    height: 40px;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-stats {
    justify-content: center;
  }
  
  .about-intro {
    flex-direction: column;
    text-align: center;
  }
  
  .expertise-grid {
    grid-template-columns: 1fr;
  }
  
  .workflow-steps {
    grid-template-columns: 1fr;
  }
  
  .timeline::before {
    left: 20px;
  }
  
  .timeline-item {
    flex-direction: column;
  }
  
  .timeline-date {
    width: auto;
    text-align: left;
    padding: 0 0 var(--spacing-sm) 40px;
  }
  
  .timeline-date::after {
    left: 14px;
    right: auto;
  }
  
  .timeline-content {
    margin-left: 40px;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .project-highlights {
    flex-direction: column;
  }
}