:root {
  --bg: #ffffff;
  --accent: #1f6feb;
  --accent-2: #0d9488;
  --accent-3: #7c3aed;
  --warn: #dc2626;
  --success: #16a34a;
  --text: #1e293b;
  --text-2: #475569;
  --muted: #94a3b8;
  --grid: #e5e7eb;
  --light-bg: #f8fafc;
  --blue-bg: #dbeafe;
  --teal-bg: #ccfbf1;
  --purple-bg: #ede9fe;
  --red-bg: #fee2e2;
}

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

body {
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 17px;
}

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

/* Layout */
.site-header {
  border-bottom: 1px solid var(--grid);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-header .logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}
.site-header nav a {
  margin-left: 1.5rem;
  color: var(--text-2);
  font-size: 0.95rem;
}
.site-header nav a:hover { color: var(--accent); }

.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* Home page hero */
.hero {
  text-align: center;
  padding: 4rem 1rem 3rem;
}
.hero h1 {
  font-size: 2.5rem;
  line-height: 1.2;
  margin-bottom: 1rem;
}
.hero p {
  font-size: 1.15rem;
  color: var(--text-2);
  max-width: 600px;
  margin: 0 auto;
}

/* Blog card list */
.blog-list {
  list-style: none;
  margin-top: 2.5rem;
}
.blog-card {
  border: 1px solid var(--grid);
  border-radius: 8px;
  padding: 1.5rem 1.75rem;
  margin-bottom: 1.25rem;
  transition: box-shadow 0.15s ease;
}
.blog-card:hover {
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}
.blog-card h2 {
  font-size: 1.3rem;
  margin-bottom: 0.4rem;
}
.blog-card h2 a { color: var(--text); }
.blog-card h2 a:hover { color: var(--accent); text-decoration: none; }
.blog-card .meta {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.6rem;
}
.blog-card .excerpt {
  color: var(--text-2);
  font-size: 0.95rem;
}
.blog-card .tags { margin-top: 0.75rem; }
.tag {
  display: inline-block;
  background: var(--light-bg);
  color: var(--text-2);
  font-size: 0.78rem;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-right: 0.4rem;
}

/* Blog post */
.post-header { margin-bottom: 2rem; }
.post-header h1 {
  font-size: 2rem;
  line-height: 1.25;
  margin-bottom: 0.6rem;
}
.post-header .meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.post-content h2 {
  font-size: 1.5rem;
  margin: 2.5rem 0 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--grid);
}
.post-content h3 {
  font-size: 1.2rem;
  margin: 1.8rem 0 0.5rem;
  color: var(--text);
}
.post-content p { margin-bottom: 1rem; }
.post-content ul, .post-content ol {
  margin: 0.75rem 0 1rem 1.5rem;
}
.post-content li { margin-bottom: 0.4rem; }
.post-content strong { font-weight: 600; }

.post-content img {
  width: 130%;
  max-width: 130%;
  margin-left: -15%;
  height: auto;
  border-radius: 6px;
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
}
@media (max-width: 640px) {
  .post-content img {
    width: 100%;
    max-width: 100%;
    margin-left: 0;
  }
}

.post-content code {
  background: var(--light-bg);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}
.post-content pre {
  background: var(--light-bg);
  border: 1px solid var(--grid);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
  font-size: 0.88rem;
  line-height: 1.55;
}
.post-content pre code {
  background: none;
  padding: 0;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  font-size: 0.92rem;
}
.post-content th, .post-content td {
  border: 1px solid var(--grid);
  padding: 0.6rem 0.9rem;
  text-align: left;
}
.post-content th {
  background: var(--light-bg);
  font-weight: 600;
}

.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  color: var(--text-2);
  background: var(--light-bg);
  border-radius: 0 6px 6px 0;
}

/* Callout box */
.callout {
  background: var(--blue-bg);
  border-left: 4px solid var(--accent);
  padding: 1rem 1.25rem;
  border-radius: 0 6px 6px 0;
  margin: 1.5rem 0;
}
.callout.teal { background: var(--teal-bg); border-color: var(--accent-2); }
.callout.warn { background: var(--red-bg); border-color: var(--warn); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--grid);
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

/* Back link */
.back-link {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-2);
}
.back-link:hover { color: var(--accent); }

@media (max-width: 640px) {
  .hero h1 { font-size: 1.8rem; }
  .container { padding: 1.5rem 1rem 3rem; }
  .post-header h1 { font-size: 1.5rem; }
}