/* Geist Mono - Vercel's font for developers */
@import url('https://fonts.googleapis.com/css2?family=Geist+Mono:wght@400;500;600;700;800&display=swap');

:root {
  --bg: #fefefe;
  --text: #1a1a1a;
  --text-muted: #666;
  --border: #1a1a1a;
  --accent: #7c3aed;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-500: #737373;
  --gray-600: #525252;
}

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

body {
  font-family: "Geist Mono", "SF Mono", "Fira Code", "JetBrains Mono", monospace;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

/* Header */
header {
  border: 2px solid var(--border);
  padding: 2rem;
  margin-bottom: 2rem;
}

h1 {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  margin-bottom: 0.25rem;
}

h1 .spiral {
  color: var(--accent);
}

.tagline {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Navigation */
nav {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--gray-200);
  padding-bottom: 1rem;
}

nav a {
  color: var(--text);
  text-decoration: none;
  font-size: 0.85rem;
}

nav a:hover, nav a.active {
  text-decoration: underline;
}

/* Posts list */
.posts-list {
  list-style: none;
}

.posts-list li {
  border: 2px solid var(--border);
  margin-bottom: 1rem;
  padding: 1.5rem;
}

.posts-list li:hover {
  background: var(--gray-100);
}

.post-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.post-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.post-title a {
  color: var(--text);
  text-decoration: none;
}

.post-title a:hover {
  text-decoration: underline;
}

.post-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.post-tags {
  margin-top: 0.75rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.7rem;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  padding: 0.2rem 0.5rem;
}

/* Article */
article {
  border: 2px solid var(--border);
  padding: 2rem;
}

article h1 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

article .meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--gray-200);
}

article p {
  margin-bottom: 1rem;
}

article h2 {
  font-size: 1.1rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--gray-200);
  padding-bottom: 0.5rem;
}

article ul, article ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

article blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 1.5rem 0;
  color: var(--text-muted);
  font-style: italic;
}

article code {
  background: var(--gray-100);
  padding: 0.15rem 0.3rem;
  font-size: 0.85em;
}

article pre {
  background: var(--gray-100);
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid var(--gray-200);
}

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

/* Charts */
.chart-container {
  margin: 2rem 0;
  border: 1px solid var(--gray-200);
  padding: 1rem;
  background: var(--gray-100);
}

.chart-title {
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.chart-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* Footer */
footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--gray-200);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}

/* Back link */
.back-link {
  display: inline-block;
  margin-bottom: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
}

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

/* Highlight box */
.highlight {
  background: var(--gray-100);
  border: 2px solid var(--accent);
  padding: 1rem;
  margin: 1.5rem 0;
}

/* Data table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.85rem;
}

.data-table th, .data-table td {
  border: 1px solid var(--gray-200);
  padding: 0.5rem;
  text-align: left;
}

.data-table th {
  background: var(--gray-100);
  font-weight: 700;
}

.data-table tr:hover {
  background: var(--gray-100);
}