/* ===================================
   Design System & CSS Variables
   =================================== */

:root {
  /* Color Palette - Modern & Premium */
  --primary: hsl(210, 100%, 50%);
  --primary-dark: hsl(210, 100%, 40%);
  --primary-light: hsl(210, 100%, 60%);
  --accent: hsl(280, 80%, 60%);
  --accent-dark: hsl(280, 80%, 50%);

  /* Neutrals */
  --bg-primary: hsl(0, 0%, 100%);
  --bg-secondary: hsl(220, 15%, 97%);
  --text-primary: hsl(220, 20%, 20%);
  --text-secondary: hsl(220, 10%, 45%);
  --text-tertiary: hsl(220, 10%, 65%);

  /* Dark Mode Colors */
  --dark-bg-primary: hsl(220, 20%, 10%);
  --dark-bg-secondary: hsl(220, 18%, 14%);
  --dark-text-primary: hsl(220, 15%, 95%);
  --dark-text-secondary: hsl(220, 10%, 75%);
  --dark-text-tertiary: hsl(220, 10%, 55%);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  --gradient-subtle: linear-gradient(135deg, hsla(210, 100%, 50%, 0.1) 0%, hsla(280, 80%, 60%, 0.1) 100%);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;
  --space-10: 4rem;
  --space-12: 6rem;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Outfit', var(--font-sans);

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  /* Borders & Radii */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* 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);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-tooltip: 1050;
}

/* Dark Mode */
[data-theme="dark"] {
  --bg-primary: var(--dark-bg-primary);
  --bg-secondary: var(--dark-bg-secondary);
  --text-primary: var(--dark-text-primary);
  --text-secondary: var(--dark-text-secondary);
  --text-tertiary: var(--dark-text-tertiary);
}

/* ===================================
   Reset & Base Styles
   =================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

h1 {
  font-size: var(--text-5xl);
}

h2 {
  font-size: var(--text-4xl);
}

h3 {
  font-size: var(--text-3xl);
}

h4 {
  font-size: var(--text-2xl);
}

h5 {
  font-size: var(--text-xl);
}

h6 {
  font-size: var(--text-lg);
}

p {
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
}

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

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ===================================
   Layout Components
   =================================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container-narrow {
  max-width: 800px;
}

.section {
  padding: var(--space-12) 0;
}

.section-sm {
  padding: var(--space-8) 0;
}

/* ===================================
   Navigation
   =================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background-color: hsla(0, 0%, 100%, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid hsla(220, 15%, 85%, 0.5);
  transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
  background-color: hsla(220, 20%, 10%, 0.8);
  border-bottom-color: hsla(220, 18%, 25%, 0.5);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-4) var(--space-6);
  max-width: 1200px;
  margin: 0 auto;
}

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

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-6);
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: color var(--transition-fast);
  position: relative;
}

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

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

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

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: var(--text-xl);
  color: var(--text-secondary);
  transition: transform var(--transition-fast);
  padding: var(--space-2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  transform: rotate(15deg);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  font-size: var(--text-2xl);
  color: var(--text-primary);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-subtle);
  z-index: -1;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  z-index: 1;
}

.hero-image {
  width: 180px;
  height: 180px;
  border-radius: var(--radius-full);
  margin: 0 auto var(--space-6);
  border: 4px solid var(--bg-primary);
  box-shadow: var(--shadow-xl);
  animation: float 3s ease-in-out infinite;
  object-fit: cover;
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

.hero-greeting {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: var(--space-2);
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 0.2s forwards;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  margin-bottom: var(--space-4);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 0.4s forwards;
}

.hero-subtitle {
  font-size: var(--text-2xl);
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 0.6s forwards;
}

.hero-description {
  font-size: var(--text-lg);
  color: var(--text-tertiary);
  max-width: 600px;
  margin: 0 auto var(--space-8);
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 0.8s forwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

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

.hero-cta {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.6s ease-out 1s forwards;
}

/* ===================================
   Buttons
   =================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  text-decoration: none;
  font-family: var(--font-sans);
}

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

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

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

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

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

/* ===================================
   Cards
   =================================== */

.card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: 1px solid hsla(220, 15%, 85%, 0.3);
}

[data-theme="dark"] .card {
  border-color: hsla(220, 18%, 25%, 0.3);
}

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

.card-glass {
  background: hsla(0, 0%, 100%, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid hsla(220, 15%, 85%, 0.5);
}

[data-theme="dark"] .card-glass {
  background: hsla(220, 20%, 14%, 0.7);
  border-color: hsla(220, 18%, 25%, 0.5);
}

/* ===================================
   Grid System
   =================================== */

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ===================================
   About Section
   =================================== */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}

.about-content h2 {
  margin-bottom: var(--space-5);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.stat-card {
  text-align: center;
  padding: var(--space-5);
}

.stat-number {
  font-size: var(--text-4xl);
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===================================
   Experience Section
   =================================== */

.experience-item {
  position: relative;
  padding-left: var(--space-8);
  margin-bottom: var(--space-8);
}

.experience-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: -var(--space-8);
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), transparent);
}

.experience-item:last-child::before {
  display: none;
}

.experience-dot {
  position: absolute;
  left: -6px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  box-shadow: 0 0 0 4px var(--bg-primary);
}

.experience-date {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  margin-bottom: var(--space-2);
  font-weight: 600;
}

.experience-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.experience-company {
  font-size: var(--text-base);
  color: var(--primary);
  margin-bottom: var(--space-3);
  font-weight: 600;
}

.experience-description {
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* ===================================
   Skills Section
   =================================== */

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.skill-tag {
  padding: var(--space-2) var(--space-4);
  background: var(--gradient-subtle);
  border: 1px solid hsla(210, 100%, 50%, 0.2);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  background: var(--gradient-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ===================================
   Blog Section
   =================================== */

.blog-card {
  overflow: hidden;
}

.blog-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  transition: transform var(--transition-slow);
}

.blog-card:hover .blog-image {
  transform: scale(1.05);
}

.blog-meta {
  display: flex;
  gap: var(--space-4);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  margin-bottom: var(--space-3);
}

.blog-title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.blog-excerpt {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.read-more {
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: gap var(--transition-fast);
}

.read-more:hover {
  gap: var(--space-3);
}

/* ===================================
   Contact Section
   =================================== */

.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.social-link {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-subtle);
  border: 1px solid hsla(210, 100%, 50%, 0.2);
  font-size: var(--text-xl);
  color: var(--text-primary);
  transition: all var(--transition-base);
}

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

/* ===================================
   Footer
   =================================== */

.footer {
  background: var(--bg-secondary);
  padding: var(--space-8) 0 var(--space-6);
  text-align: center;
  border-top: 1px solid hsla(220, 15%, 85%, 0.5);
}

[data-theme="dark"] .footer {
  border-top-color: hsla(220, 18%, 25%, 0.5);
}

.footer p {
  color: var(--text-tertiary);
  margin-bottom: 0;
  font-size: var(--text-sm);
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-primary);
    padding: var(--space-6);
    box-shadow: var(--shadow-lg);
    transform: translateY(-150%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
    height: calc(100vh - 70px);
    justify-content: flex-start;
    overflow-y: auto;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  h1 {
    font-size: var(--text-4xl);
  }

  h2 {
    font-size: var(--text-3xl);
  }

  .section {
    padding: var(--space-8) 0;
  }
}

@media (max-width: 480px) {
  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================
   Utility Classes
   =================================== */

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

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

.section-title {
  text-align: center;
  margin-bottom: var(--space-10);
}

.section-subtitle {
  color: var(--text-tertiary);
  text-align: center;
  margin-top: calc(-1 * var(--space-6));
  margin-bottom: var(--space-8);
}