/* ===================================
   Design System & CSS Variables
   =================================== */
:root {
  /* Color Palette */
  --color-primary: hsl(280, 70%, 60%);
  --color-secondary: hsl(320, 80%, 65%);
  --color-accent: hsl(220, 90%, 60%);
  --color-bg-dark: hsl(240, 20%, 8%);
  --color-bg-darker: hsl(240, 25%, 5%);
  --color-surface: hsla(260, 30%, 15%, 0.6);
  --color-surface-hover: hsla(260, 30%, 20%, 0.8);
  --color-text-primary: hsl(0, 0%, 95%);
  --color-text-secondary: hsl(0, 0%, 70%);
  --color-text-muted: hsl(0, 0%, 50%);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  --gradient-accent: linear-gradient(135deg, var(--color-accent), var(--color-primary));
  --gradient-hero: linear-gradient(135deg, 
    hsl(280, 70%, 20%) 0%, 
    hsl(240, 60%, 15%) 50%, 
    hsl(220, 70%, 20%) 100%);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 2rem;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(168, 85, 247, 0.4);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background: var(--color-bg-darker);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--color-text-primary);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--color-text-primary);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

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

a:hover {
  color: var(--color-secondary);
}

/* ===================================
   Navigation
   =================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: hsla(240, 20%, 8%, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid hsla(260, 30%, 30%, 0.3);
  padding: var(--spacing-sm) 0;
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: hsla(240, 20%, 8%, 0.95);
  box-shadow: var(--shadow-md);
}

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

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-normal);
}

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

.nav-links a:hover::after {
  width: 100%;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: var(--gradient-hero);
  padding: var(--spacing-lg) var(--spacing-md);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('hero_background.png') center/cover no-repeat;
  opacity: 0.15;
  z-index: 0;
}

.hero-content {
  max-width: 1200px;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text {
  animation: fadeInUp 1s ease;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-secondary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.hero-title {
  margin-bottom: var(--spacing-sm);
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn {
  padding: 1rem 2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

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

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 2px solid var(--color-primary);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--color-surface-hover);
  transform: translateY(-2px);
}

.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeInRight 1s ease;
}

.profile-image {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  animation: float 6s ease-in-out infinite;
}

/* ===================================
   Section Styles
   =================================== */
section {
  padding: var(--spacing-xl) var(--spacing-md);
  max-width: 1200px;
  margin: 0 auto;
}

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

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

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.section-subtitle {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ===================================
   About Section
   =================================== */
.about {
  background: var(--color-bg-dark);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.about-text p {
  font-size: 1.1rem;
  line-height: 1.8;
}

.highlight {
  color: var(--color-primary);
  font-weight: 600;
}

/* ===================================
   Timeline
   =================================== */
.timeline {
  position: relative;
  padding-left: var(--spacing-md);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  padding-bottom: var(--spacing-md);
  opacity: 0;
  transform: translateX(-20px);
  transition: all var(--transition-slow);
}

.timeline-item.visible {
  opacity: 1;
  transform: translateX(0);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.3rem;
  top: 0.5rem;
  width: 16px;
  height: 16px;
  background: var(--gradient-primary);
  border-radius: 50%;
  border: 3px solid var(--color-bg-dark);
  box-shadow: var(--shadow-glow);
}

.timeline-year {
  font-size: 0.9rem;
  color: var(--color-secondary);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-role {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 0.25rem;
}

.timeline-description {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===================================
   Skills Section
   =================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.skill-card {
  background: var(--color-surface);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  border: 1px solid hsla(260, 30%, 30%, 0.3);
  transition: all var(--transition-normal);
  opacity: 0;
  transform: translateY(20px);
}

.skill-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.skill-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.skill-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  display: block;
}

.skill-card h3 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.skill-card p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: var(--spacing-sm);
}

.tag {
  background: hsla(280, 70%, 60%, 0.2);
  color: var(--color-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid hsla(280, 70%, 60%, 0.3);
}

/* ===================================
   Blog Section
   =================================== */
.blog {
  background: var(--color-bg-dark);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.blog-card {
  background: var(--color-surface);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid hsla(260, 30%, 30%, 0.3);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.blog-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-secondary);
}

.blog-image {
  width: 100%;
  height: 200px;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  opacity: 0.8;
}

.blog-content {
  padding: var(--spacing-md);
}

.blog-date {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.blog-card h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.blog-excerpt {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.read-more {
  color: var(--color-primary);
  font-weight: 600;
  margin-top: var(--spacing-sm);
  display: inline-block;
  transition: all var(--transition-fast);
}

.read-more:hover {
  color: var(--color-secondary);
  transform: translateX(4px);
}

/* ===================================
   Contact Section
   =================================== */
.contact-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact-text {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
}

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

.social-link {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  transition: all var(--transition-normal);
  border: 2px solid transparent;
}

.social-link:hover {
  background: var(--gradient-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

/* ===================================
   Footer
   =================================== */
footer {
  background: var(--color-bg-darker);
  padding: var(--spacing-md);
  text-align: center;
  border-top: 1px solid hsla(260, 30%, 30%, 0.3);
}

footer p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

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

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

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

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg-dark);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-image {
    order: -1;
  }
  
  .profile-image {
    max-width: 300px;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .about-content {
    grid-template-columns: 1fr;
  }
  
  section {
    padding: var(--spacing-lg) var(--spacing-sm);
  }
  
  .skills-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
}