/* ============================================
   PROFESSIONAL PORTFOLIO STYLESHEET
   ============================================ */

/* --- CSS Variables --- */
:root {
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --background: #ffffff;
  --background-alt: #f9fafb;
  --border-color: #e5e7eb;
  --max-width: 1000px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', 'Roboto',
               'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--background);
  font-size: 16px;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

h1 { font-size: 2.5rem; margin-bottom: var(--spacing-md); }
h2 { font-size: 2rem; margin-bottom: var(--spacing-md); }
h3 { font-size: 1.5rem; margin-bottom: var(--spacing-sm); }
h4 { font-size: 1.25rem; margin-bottom: var(--spacing-sm); }

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

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* --- Container --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* --- Header & Navigation --- */
.site-header {
  background-color: var(--background);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
}

.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.site-logo:hover {
  color: var(--accent-color);
}

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

.nav-menu a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--accent-color);
}

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

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.hero .tagline {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.cta-button {
  display: inline-block;
  padding: 0.875rem 2rem;
  background-color: var(--accent-color);
  color: white;
  border-radius: 6px;
  font-weight: 500;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

.cta-button:hover {
  background-color: var(--accent-hover);
  color: white;
  transform: translateY(-1px);
}

.cta-secondary {
  display: inline-block;
  padding: 0.875rem 2rem;
  border: 2px solid var(--accent-color);
  color: var(--accent-color);
  border-radius: 6px;
  font-weight: 500;
  margin-left: var(--spacing-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.cta-secondary:hover {
  background-color: var(--accent-color);
  color: white;
}

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

.section-alt {
  background-color: var(--background-alt);
}

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

/* --- Expertise Grid --- */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.expertise-item {
  text-align: center;
  padding: var(--spacing-md);
}

.expertise-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  color: var(--accent-color);
}

.expertise-item h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
}

.expertise-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* --- Projects Grid --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.project-card {
  background: var(--background);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.project-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid var(--border-color);
}

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

.project-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.project-card p {
  font-size: 0.95rem;
  margin-bottom: var(--spacing-sm);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background-color: var(--background-alt);
  color: var(--text-secondary);
  border-radius: 4px;
  font-size: 0.85rem;
  border: 1px solid var(--border-color);
}

/* --- Bio Section --- */
.bio {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.bio p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* --- Services --- */
.services-list {
  display: grid;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.service-item {
  padding: var(--spacing-md);
  border-left: 4px solid var(--accent-color);
  background-color: var(--background-alt);
}

.service-item h3 {
  margin-bottom: var(--spacing-sm);
}

.service-item p {
  margin-bottom: var(--spacing-xs);
}

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

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

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  transition: border-color 0.2s ease, color 0.2s ease;
}

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

/* --- Blog Listing --- */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.blog-post {
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.blog-post:last-child {
  border-bottom: none;
}

.blog-post h3 {
  margin-bottom: var(--spacing-xs);
}

.blog-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-sm);
}

.blog-post p {
  margin-bottom: var(--spacing-sm);
}

.read-more {
  color: var(--accent-color);
  font-weight: 500;
}

/* --- Footer --- */
.site-footer {
  background-color: var(--background-alt);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-xl);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

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

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--accent-color);
}

.copyright {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* --- About Page Specifics --- */
.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.profile-image {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  margin: 0 auto var(--spacing-lg);
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }

  .hero h1 { font-size: 2.25rem; }
  .hero .tagline { font-size: 1.1rem; }

  .nav-menu {
    gap: var(--spacing-sm);
  }

  .nav-menu a {
    font-size: 0.9rem;
  }

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

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

  .cta-secondary {
    margin-left: 0;
    margin-top: var(--spacing-sm);
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .nav-wrapper {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

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

/* --- Utility Classes --- */
.text-center { text-align: center; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }