/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Light theme colors */
  --color-neutral-900: #0a0a0a;
  --color-neutral-800: #1a1a1a;
  --color-neutral-700: #2a2a2a;
  --color-neutral-600: #4a4a4a;
  --color-neutral-500: #6a6a6a;
  --color-neutral-400: #8a8a8a;
  --color-neutral-300: #bababa;
  --color-neutral-200: #e0e0e0;
  --color-neutral-100: #f5f5f5;
  --color-neutral-50: #fafafa;
  --color-white: #ffffff;
  --color-accent: #0066cc;
  --color-accent-hover: #0052a3;
  
  /* Theme-specific colors */
  --color-background: var(--color-white);
  --color-background-alt: var(--color-neutral-50);
  --color-text-primary: var(--color-neutral-900);
  --color-text-secondary: var(--color-neutral-700);
  --color-text-tertiary: var(--color-neutral-600);
  --color-border: var(--color-neutral-200);
  --color-nav-background: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] {
  /* Dark theme colors */
  --color-neutral-900: #fafafa;
  --color-neutral-800: #f0f0f0;
  --color-neutral-700: #e0e0e0;
  --color-neutral-600: #c0c0c0;
  --color-neutral-500: #a0a0a0;
  --color-neutral-400: #808080;
  --color-neutral-300: #606060;
  --color-neutral-200: #404040;
  --color-neutral-100: #2a2a2a;
  --color-neutral-50: #1a1a1a;
  --color-white: #0a0a0a;
  --color-accent: #4da6ff;
  --color-accent-hover: #66b3ff;
  
  /* Theme-specific colors */
  --color-background: var(--color-white);
  --color-background-alt: var(--color-neutral-50);
  --color-text-primary: var(--color-neutral-900);
  --color-text-secondary: var(--color-neutral-700);
  --color-text-tertiary: var(--color-neutral-600);
  --color-border: var(--color-neutral-200);
  --color-nav-background: rgba(10, 10, 10, 0.95);
}

:root {
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-heading: 'Raleway', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  
  --container-max-width: 1200px;
  --content-max-width: 800px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-regular);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--color-nav-background);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
  align-items: center;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color 0.2s ease;
}

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

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-md);
  color: var(--color-text-primary);
  cursor: pointer;
  font-size: 1.25rem;
  padding: var(--spacing-xs);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.theme-toggle:hover {
  background-color: var(--color-background-alt);
  border-color: var(--color-text-tertiary);
}

/* Hero Section */
.hero {
  padding: calc(70px + var(--spacing-4xl)) 0 var(--spacing-4xl);
  text-align: center;
}

.hero-title {
  font-family: var(--font-family-heading);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-lg);
  font-weight: var(--font-weight-medium);
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Sections */
section {
  padding: var(--spacing-4xl) 0;
}

.section-title {
  font-family: var(--font-family-heading);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-2xl);
  text-align: center;
}

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

.about-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.about-text p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

.about-text h3 {
  font-family: var(--font-family-heading);
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: var(--spacing-2xl) 0 var(--spacing-lg);
}

.experience-item {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.experience-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.experience-item h4 {
  font-family: var(--font-family-heading);
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.company {
  font-size: 1rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-medium);
}

.experience-item p:last-child {
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* Work Section */
.work-item {
  max-width: var(--content-max-width);
  margin: 0 auto;
}

.video-container {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.work-content h3 {
  font-family: var(--font-family-heading);
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.work-content p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Contact Section */
.contact {
  background-color: var(--color-background-alt);
}

.contact-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  text-align: center;
}

.contact-content p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.contact-link {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  color: var(--color-accent);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  border: 2px solid var(--color-accent);
  border-radius: var(--border-radius-md);
  transition: all 0.2s ease;
}

.contact-link:hover {
  background-color: var(--color-accent);
  color: var(--color-background);
}

/* Footer */
.footer {
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer p {
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    padding: 0 var(--spacing-md);
  }
  
  .nav-links {
    gap: var(--spacing-lg);
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .hero {
    padding: calc(70px + var(--spacing-2xl)) 0 var(--spacing-2xl);
  }
  
  section {
    padding: var(--spacing-2xl) 0;
  }
  
  .contact-links {
    flex-direction: column;
    align-items: center;
  }
  
  .contact-link {
    width: 200px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .nav-links {
    gap: var(--spacing-md);
  }
  
  .nav-link {
    font-size: 0.9rem;
  }
}