:root {
  --color-bg: #fafafa;
  --color-text: #2d2d2d;
  --color-text-muted: #666;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-border: #e5e5e5;
  --color-card-bg: #fff;
  --max-width: 48rem;
}

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

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

/* Header / Nav */
header {
  border-bottom: 1px solid var(--color-border);
}

nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.95rem;
}

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

/* Main content */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Hero */
.hero {
  padding: 3rem 0;
}

.hero h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.hero p {
  font-size: 1.15rem;
  color: var(--color-text-muted);
}

/* Headings */
h1 { font-size: 1.75rem; margin-bottom: 1rem; }
h2 { font-size: 1.4rem; margin: 2rem 0 0.75rem; }
h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }

/* Links */
a {
  color: var(--color-accent);
  text-decoration: none;
}

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

/* Article content */
article p {
  margin-bottom: 1rem;
}

article ul, article ol {
  margin: 0 0 1rem 1.5rem;
}

article code {
  background: var(--color-border);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  font-size: 0.9em;
}

article pre {
  background: var(--color-text);
  color: #f5f5f5;
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: 1rem;
}

article pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Project grid */
.projects-preview {
  margin-top: 2rem;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin: 1rem 0;
}

.project-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem;
}

.project-card h3 a {
  color: var(--color-text);
}

.project-card h3 a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.project-card p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* Tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.tag {
  background: var(--color-border);
  color: var(--color-text-muted);
  padding: 0.15em 0.6em;
  border-radius: 4px;
  font-size: 0.8rem;
}

/* Summary list */
.summary {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--color-border);
}

.summary:last-child {
  border-bottom: none;
}

/* Footer */
footer {
  border-top: 1px solid var(--color-border);
  text-align: center;
  padding: 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 600px) {
  .hero h1 { font-size: 1.5rem; }
  .project-grid { grid-template-columns: 1fr; }
}