:root {
  --bg: #fafafa;
  --bg-card: #ffffff;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --accent: #b45309;
  --accent-hover: #92400e;
  --tag-bg: #f3f4f6;
  --tag-text: #374151;
  --tag-report: #dbeafe;
  --tag-report-text: #1e40af;
  --tag-app: #d1fae5;
  --tag-app-text: #065f46;
  --tag-experiment: #fef3c7;
  --tag-experiment-text: #92400e;
  --tag-reference: #ede9fe;
  --tag-reference-text: #5b21b6;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.06);
  --max-width: 960px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", SFMono-Regular, ui-monospace, Menlo, Consolas, monospace;
}

/* Dark mode removed — light only for now */

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

html { font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* Site header */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
}

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

.site-nav { display: flex; gap: 1.5rem; }

.site-nav a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
}

.site-nav a:hover { color: var(--text); }

/* Main content */
.content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

/* Home page */
.home-intro {
  margin-bottom: 2.5rem;
}

.home-intro h1 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.home-intro p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 640px;
}

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

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.project-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
}

.project-card h3 {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

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

.project-card p {
  color: var(--text-muted);
  font-size: 0.875rem;
  flex: 1;
}

.project-tags {
  display: flex;
  gap: 0.375rem;
  flex-wrap: wrap;
  margin-top: 0.25rem;
}

.tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 100px;
  background: var(--tag-bg);
  color: var(--tag-text);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.tag-report { background: var(--tag-report); color: var(--tag-report-text); }
.tag-app { background: var(--tag-app); color: var(--tag-app-text); }
.tag-experiment { background: var(--tag-experiment); color: var(--tag-experiment-text); }
.tag-reference { background: var(--tag-reference); color: var(--tag-reference-text); }

/* Project page */
.project-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.project-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.project-header .description {
  color: var(--text-muted);
  font-size: 1rem;
}

.project-pages {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.project-pages li a {
  display: block;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 500;
  transition: border-color 0.15s ease;
}

.project-pages li a:hover {
  border-color: var(--accent);
}

/* Page content (markdown) */
.page-content h1 { font-size: 1.5rem; font-weight: 700; margin: 2rem 0 0.75rem; letter-spacing: -0.02em; }
.page-content h2 { font-size: 1.25rem; font-weight: 700; margin: 1.75rem 0 0.5rem; letter-spacing: -0.01em; }
.page-content h3 { font-size: 1.1rem; font-weight: 600; margin: 1.5rem 0 0.5rem; }
.page-content p { margin-bottom: 1rem; }
.page-content ul, .page-content ol { margin-bottom: 1rem; padding-left: 1.5rem; }
.page-content li { margin-bottom: 0.25rem; }

.page-content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--tag-bg);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
}

.page-content pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  overflow-x: auto;
  margin-bottom: 1rem;
}

.page-content pre code {
  background: none;
  padding: 0;
}

.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.page-content th, .page-content td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

.page-content th {
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.page-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.page-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

/* Breadcrumb */
.breadcrumb {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.site-footer a { color: var(--text-muted); }
.site-footer a:hover { color: var(--accent); }

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 0.5rem;
}