/* Base Variables */
:root {
  /* Colors */
  --color-primary: #2D2D2D;
  --color-secondary: #2563EB;
  --color-background: #FFFFFF;
  --color-text: #333333;
  --color-accent: #E0E0E0;
  
  /* Spacing */
  --spacing-base: 24px;
  --spacing-small: 12px;
  --spacing-large: 48px;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", 
                 "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", 
                 "Helvetica Neue", sans-serif;
  
  /* Layout */
  --max-width: 800px;
  --transition-speed: 0.3s;
}

/* Base Styles */
html {
  box-sizing: border-box;
  font-size: 16px;
}

*, *:before, *:after {
  box-sizing: inherit;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  margin: 0;
  padding: 0;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-top: var(--spacing-base);
  margin-bottom: var(--spacing-small);
  line-height: 1.3;
  color: var(--color-primary);
  font-weight: 600;
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.5rem;
  text-align: center;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.8rem;
}

h3 {
  font-size: 1.4rem;
}

p {
  margin-top: 0;
  margin-bottom: var(--spacing-base);
  line-height: 1.7;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-speed);
  font-weight: 500;
}

a:hover, a:focus {
  color: var(--color-primary);
  text-decoration: underline;
}

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

header {
  padding: var(--spacing-base) 0;
  border-bottom: 1px solid var(--color-accent);
}

footer {
  padding: var(--spacing-base) 0;
  border-top: 1px solid var(--color-accent);
  margin-top: var(--spacing-large);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-primary);
}

main {
  padding: var(--spacing-large) 0;
  min-height: 60vh;
}

/* Navigation */
.nav {
  display: flex;
  justify-content: center;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav li {
  margin: 0 var(--spacing-small);
}

.nav a {
  color: var(--color-text);
  font-weight: 500;
  text-decoration: none;
  padding: var(--spacing-small) 0;
  position: relative;
}

.nav a:hover, .nav a:focus, .nav a.active {
  color: var(--color-secondary);
}

.nav a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-secondary);
}

/* Buttons */
.btn {
  /* Structure */
  display: inline-block;
  padding: var(--spacing-small) var(--spacing-base);
  border-radius: 4px;
  border: none;
  
  /* Typography */
  font-weight: 500;
  text-decoration: none;
  text-align: center;
  
  /* Colors */
  background-color: var(--color-primary);
  color: var(--color-background);
  
  /* Interaction */
  cursor: pointer;
  transition: background-color var(--transition-speed), 
              color var(--transition-speed),
              transform 0.2s ease;
}

.btn:hover, .btn:focus {
  background-color: var(--color-secondary);
  color: var(--color-background);
  text-decoration: none;
  transform: translateY(-2px);
}

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

.btn-secondary:hover, .btn-secondary:focus {
  background-color: var(--color-secondary);
  color: var(--color-background);
}

/* Home Page */
.hero {
  text-align: center;
  padding: var(--spacing-large) 0 var(--spacing-small);
}

.hero h1 {
  margin-bottom: var(--spacing-small);
}

.hero p {
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto;
}

.about-me {
  margin-bottom: var(--spacing-large);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.section-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-base);
  margin-top: var(--spacing-large);
}

/* Resume */
.resume-section {
  margin-bottom: var(--spacing-large);
}

.resume-download {
  text-align: center;
  margin: var(--spacing-large) 0;
}

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

.project-card {
  border: 1px solid var(--color-accent);
  border-radius: 4px;
  padding: var(--spacing-base);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.project-card h3 {
  margin-top: 0;
}

.project-links {
  display: flex;
  gap: var(--spacing-small);
  margin-top: var(--spacing-base);
}

.project-tech {
  margin-top: var(--spacing-small);
  font-size: 0.9rem;
  color: var(--color-primary);
}

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

/* Blog post titles should be black */
.blog-card h2 a {
  color: var(--color-primary);
  transition: opacity var(--transition-speed);
}

.blog-card h2 a:hover, .blog-card h2 a:focus {
  color: var(--color-primary);
  opacity: 0.8;
  text-decoration: none;
}

.rss-note {
  background-color: rgba(37, 99, 235, 0.1);
  border: 1px solid rgba(37, 99, 235, 0.2);
  padding: calc(var(--spacing-small) * 0.8);
  border-radius: 4px;
  font-size: 0.9rem;
  text-align: center;
  margin-bottom: var(--spacing-base);
}

.rss-note a {
  font-weight: 600;
}

.blog-card {
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: var(--spacing-base);
}

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

.blog-date {
  color: var(--color-primary);
  font-size: 0.9rem;
}

.blog-post-header {
  margin-bottom: var(--spacing-large);
}

.blog-post-header h1 {
  color: var(--color-primary);
}

.blog-post-meta {
  font-size: 0.9rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-base);
}

/* Contact */
.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: var(--spacing-base);
}

label {
  display: block;
  margin-bottom: var(--spacing-small);
  font-weight: 500;
}

input, textarea {
  width: 100%;
  padding: var(--spacing-small);
  border: 1px solid var(--color-accent);
  border-radius: 4px;
  background-color: var(--color-background);
  color: var(--color-text);
  transition: border-color var(--transition-speed);
}

input:focus, textarea:focus {
  border-color: var(--color-secondary);
  outline: none;
}

textarea {
  min-height: 150px;
  resize: vertical;
}

/* Social Links */
.social-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-base);
  margin-bottom: var(--spacing-small);
}

.social-links a {
  color: var(--color-primary);
  opacity: 0.7;
  transition: opacity var(--transition-speed), transform 0.2s ease;
}

.social-links a:hover {
  color: var(--color-secondary);
  opacity: 1;
  transform: translateY(-2px);
}

/* Error Pages */
.error-page {
  text-align: center;
  padding: var(--spacing-large) 0;
}

.error-code {
  font-size: 6rem;
  margin: 0;
  color: var(--color-accent);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  /* Typography */
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  /* Navigation */
  .nav {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .nav li {
    margin: 0 var(--spacing-small);
  }
  
  /* Layout */
  .section-links {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-small);
  }
  
  /* Portfolio */
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  /* Layout */
  .container {
    padding: 0 var(--spacing-small);
  }
  
  /* Typography */
  .hero p {
    font-size: 1rem;
  }
  
  /* Buttons */
  .btn {
    width: 100%;
    text-align: center;
  }
}

/* Code Highlighting */
pre {
  background-color: var(--color-accent);
  padding: var(--spacing-base);
  border-radius: 4px;
  overflow-x: auto;
  margin-bottom: var(--spacing-base);
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  background-color: var(--color-accent);
  padding: 0.2em 0.4em;
  border-radius: 3px;
}

pre code {
  background-color: transparent;
  padding: 0;
}

/* Alert Messages */
.alert {
  padding: var(--spacing-base);
  border-radius: 4px;
  margin-bottom: var(--spacing-base);
  font-weight: 500;
  text-align: center;
}

.alert.success {
  background-color: rgba(40, 167, 69, 0.1);
  color: #28a745;
  border: 1px solid rgba(40, 167, 69, 0.2);
}

.alert.error {
  background-color: rgba(220, 53, 69, 0.1);
  color: #dc3545;
  border: 1px solid rgba(220, 53, 69, 0.2);
}

.alert.info {
  background-color: rgba(0, 123, 255, 0.1);
  color: #0056b3;
  border: 1px solid rgba(0, 123, 255, 0.2);
}

/* Animations - Removed to improve page loading experience */