:root {
  --bg-color: #fbfbfd;
  --text-color: #1d1d1f;
  --link-color: #0066cc;
  --border-color: #d2d2d7;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

header {
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  background: rgba(251, 251, 253, 0.8);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  gap: 2rem;
  padding: 0 1.5rem;
}

nav a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  font-size: 0.9rem;
}

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

main {
  max-width: 800px;
  margin: 4rem auto;
  padding: 0 1.5rem;
}

h1, h2, h3 {
  font-weight: 600;
  margin-bottom: 1rem;
}

a {
  color: var(--link-color);
  text-decoration: none;
}

/* Blog & Markdown Styles */
#content img {
  max-width: 100%;
  border-radius: 8px;
  margin: 1.5rem 0;
}
#content blockquote {
  border-left: 3px solid var(--text-color);
  padding-left: 1rem;
  color: #555;
  margin: 1.5rem 0;
}
#content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
}
#content th, #content td {
  border: 1px solid var(--border-color);
  padding: 0.75rem;
  text-align: left;
}

/* Project Cards */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 600px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}
.card {
  background: #fff;
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--border-color);
  transition: transform 0.2s;
}
.card:hover {
  transform: translateY(-2px);
}
.card img {
  width: 100%;
  height: auto;
  border-radius: 6px;
  margin-bottom: 1rem;
}
.blog-list-item {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}