/* ---------- Base ---------- */
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: #ffffff;
  color: #1e293b; /* slate-800 */
}

.font-serif { font-family: 'Playfair Display', Georgia, serif; }

::selection { background: #1d4ed8; color: #fff; } /* blue-700 */

/* ---------- Navigation ---------- */
.site-nav {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #e2e8f0; /* slate-200 */
}

.site-nav a {
  color: #334155; /* slate-700 */
  transition: color 0.15s ease;
}
.site-nav a:hover, .site-nav a.active { color: #1d4ed8; } /* blue-700 */

.site-nav .brand { color: #0f172a; } /* slate-900 */

/* ---------- Footer ---------- */
.site-footer {
  background: #0f172a;       /* slate-900 navy band */
  color: #cbd5e1;            /* slate-300 */
  border-top: 1px solid #1e293b;
}
.site-footer a { color: #e2e8f0; }
.site-footer a:hover { color: #60a5fa; } /* blue-400 */

/* ---------- Cards / surfaces ---------- */
.card {
  background: #ffffff;
  border: 1px solid #e2e8f0; /* slate-200 */
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}
.card:hover {
  border-color: #1d4ed8;     /* blue-700 */
  box-shadow: 0 4px 18px -8px rgba(29, 78, 216, 0.25);
}

/* ---------- Markdown post body ---------- */
.prose-post {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: #334155; /* slate-700 */
}
.prose-post h1,
.prose-post h2,
.prose-post h3 {
  font-family: 'Playfair Display', Georgia, serif;
  color: #0f172a; /* slate-900 */
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  line-height: 1.25;
}
.prose-post h1 { font-size: 2rem; }
.prose-post h2 { font-size: 1.5rem; }
.prose-post h3 { font-size: 1.25rem; }
.prose-post p { margin: 1rem 0; }
.prose-post a {
  color: #1d4ed8; /* blue-700 */
  text-decoration: underline;
  text-underline-offset: 2px;
}
.prose-post a:hover { color: #1e3a8a; } /* blue-900 */
.prose-post ul, .prose-post ol { margin: 1rem 0 1rem 1.5rem; }
.prose-post ul { list-style: disc; }
.prose-post ol { list-style: decimal; }
.prose-post li { margin: 0.35rem 0; }
.prose-post blockquote {
  border-left: 3px solid #1d4ed8; /* blue-700 */
  background: #f1f5f9;            /* slate-100 */
  color: #334155;
  padding: 0.75rem 1.25rem;
  margin: 1.25rem 0;
  font-style: italic;
}
.prose-post code {
  background: #f1f5f9;
  color: #1e3a8a;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.9em;
}
.prose-post pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1rem 1.25rem;
  border-radius: 4px;
  overflow-x: auto;
  margin: 1.25rem 0;
}
.prose-post pre code { background: transparent; padding: 0; color: inherit; }
.prose-post hr {
  border: none;
  border-top: 1px solid #e2e8f0;
  margin: 2rem 0;
}
.prose-post img {
  max-width: 100%;
  border-radius: 4px;
  margin: 1.25rem 0;
  border: 1px solid #e2e8f0;
}
.prose-post table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.95em;
}
.prose-post th, .prose-post td {
  border: 1px solid #e2e8f0;
  padding: 0.5rem 0.75rem;
  text-align: left;
}
.prose-post th { background: #f1f5f9; color: #0f172a; }

/* ---------- Filter buttons ---------- */
.filter-btn {
  border: 1px solid #cbd5e1; /* slate-300 */
  color: #334155;            /* slate-700 */
  background: #ffffff;
  transition: all 0.15s ease;
}
.filter-btn:hover { border-color: #1d4ed8; color: #1d4ed8; }
.filter-btn.active {
  background: #1d4ed8;
  border-color: #1d4ed8;
  color: #ffffff;
}