:root {
  color-scheme: light dark;
  --fg: #0f172a;
  --bg: #f4f6fb;
  --card: #ffffff;
  --muted: #64748b;
  --border: #e2e8f0;
  --accent: #3b82f6;
  --accent-2: #8b5cf6;
  --accent-soft: rgba(59, 130, 246, 0.1);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 8px 24px -12px rgba(15, 23, 42, 0.18);
  --shadow-lg: 0 2px 4px rgba(15, 23, 42, 0.06), 0 16px 40px -16px rgba(15, 23, 42, 0.25);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e2e8f0;
    --bg: #0b1120;
    --card: #131c31;
    --muted: #94a3b8;
    --border: #2a3650;
    --accent-soft: rgba(59, 130, 246, 0.16);
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px -12px rgba(0,0,0,.5);
    --shadow-lg: 0 2px 4px rgba(0,0,0,.35), 0 16px 40px -16px rgba(0,0,0,.6);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--fg);
  background:
    radial-gradient(60rem 30rem at 85% -10%, var(--accent-soft), transparent 60%),
    var(--bg);
  line-height: 1.6;
}

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

img { max-width: 100%; height: auto; }

/* ---- Layout ---- */

.site-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

/* ---- Site Nav ---- */

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-nav .nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent);
  margin-right: auto;
}

.site-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
}

.site-nav a:hover { color: var(--fg); text-decoration: none; }

/* ---- Homepage Hero ---- */

.hero {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.hero h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent);
}

.hero .tagline {
  font-size: 1.15rem;
  color: var(--muted);
  margin: 0 0 1rem;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.9rem 0 1.5rem;
}

.chip {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--muted);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  box-shadow: var(--shadow);
}

.chip-accent {
  color: #fff;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.2rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #fff;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: opacity .15s;
}

.btn:hover { opacity: .85; text-decoration: none; }

.btn-ghost {
  background: var(--card);
  color: var(--fg);
  border: 1px solid var(--border);
}

/* ---- Bio ---- */

.bio {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.75rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow);
}

.bio h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  font-weight: 600;
}

.bio p {
  margin: 0 0 0.75rem;
  line-height: 1.7;
}

.bio p:last-child { margin: 0; }

/* ---- Section headings ---- */

.section-heading {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  font-weight: 600;
  margin: 0 0 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ---- Article Cards ---- */

.article-grid {
  display: grid;
  gap: 1rem;
}

.article-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow);
  transition: box-shadow .15s, border-color .15s;
}

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

.article-card a {
  display: block;
  text-decoration: none;
  color: inherit;
}

.article-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--fg);
}

.article-card:hover h3 { color: var(--accent); }

.article-card .meta {
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.article-card .excerpt {
  margin: 0.5rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.5;
}

.view-all-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
}

/* ---- Blog Index ---- */

.page-title {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent);
}

.page-subtitle {
  color: var(--muted);
  font-size: 1rem;
  margin: 0 0 2rem;
}

.category-group {
  margin-bottom: 2.5rem;
}

.category-group h2 {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--accent);
  margin: 0 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--accent-soft);
}

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.5rem;
}

.post-list li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color .15s;
}

.post-list li:hover { border-color: var(--accent); }

.post-list a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 1rem;
  text-decoration: none;
  color: var(--fg);
  font-size: 0.93rem;
}

.post-list a:hover { color: var(--accent); }

.post-list .post-date {
  font-size: 0.78rem;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ---- Article Page ---- */

.article-header {
  padding: 2rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.article-header h1 {
  font-size: clamp(1.6rem, 4vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin: 0 0 0.75rem;
  line-height: 1.2;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.82rem;
  color: var(--muted);
  align-items: center;
}

.cat-tag {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
}

/* ---- Article Content ---- */

.article-content {
  line-height: 1.75;
  overflow-x: hidden;
}

.article-content h2 {
  font-size: 1.35rem;
  margin: 2rem 0 0.75rem;
  letter-spacing: -0.015em;
  color: var(--fg);
}

.article-content h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
  color: var(--fg);
}

.article-content h4 {
  font-size: 1rem;
  margin: 1.25rem 0 0.4rem;
  color: var(--fg);
}

.article-content p {
  margin: 0 0 1rem;
}

.article-content ul, .article-content ol {
  margin: 0 0 1rem 1.5rem;
  padding: 0;
}

.article-content li { margin-bottom: 0.3rem; }

.article-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 0.5rem 0;
  box-shadow: var(--shadow);
}

.article-content pre, .article-content .hljs {
  background: #1a1f2e;
  color: #e2e8f0;
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  font-size: 0.875rem;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  line-height: 1.5;
  margin: 1rem 0 1.25rem;
  box-shadow: var(--shadow-lg);
}

.article-content code {
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875em;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 4px;
  padding: 0.15em 0.4em;
}

.article-content pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
  border-radius: 0;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.25rem;
  font-size: 0.9rem;
}

.article-content th {
  background: var(--accent-soft);
  color: var(--fg);
  font-weight: 700;
  text-align: left;
  padding: 0.6rem 0.8rem;
  border-bottom: 2px solid var(--border);
}

.article-content td {
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--border);
}

.article-content tr:hover td { background: var(--accent-soft); }

.su-table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
}

.article-content blockquote {
  border-left: 3px solid var(--accent);
  margin: 1rem 0;
  padding: 0.5rem 0 0.5rem 1.25rem;
  color: var(--muted);
  font-style: italic;
}

.article-content figure {
  margin: 1rem 0;
  text-align: center;
}

.article-content figcaption {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

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

/* Shortcodes Ultimate */

mark {
  background: rgba(253, 224, 71, 0.35);
  color: inherit;
  border-radius: 2px;
  padding: 0 0.15em;
}

@media (prefers-color-scheme: dark) {
  mark { background: rgba(253, 224, 71, 0.2); }
}

.su-note {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
}

.su-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 1rem 0;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.su-box-title {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border);
}

.su-box-content {
  padding: 0.75rem 1rem;
}

.su-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 1rem 0;
}

.su-col {
  flex: 1;
  min-width: 200px;
}

.su-list {
  padding-left: 1.5rem;
}

/* ---- Highlight.js theme (github-dark) ---- */

.hljs { background: #1a1f2e; color: #c9d1d9; }
.hljs-comment,.hljs-meta { color: #8b949e; font-style: italic; }
.hljs-keyword,.hljs-selector-tag,.hljs-title.function_ { color: #ff7b72; }
.hljs-string,.hljs-attr { color: #a5d6ff; }
.hljs-number,.hljs-literal { color: #79c0ff; }
.hljs-type,.hljs-class,.hljs-title.class_ { color: #ffa657; }
.hljs-variable,.hljs-params { color: #c9d1d9; }
.hljs-built_in { color: #f0883e; }
.hljs-tag { color: #7ee787; }
.hljs-name { color: #7ee787; }
.hljs-attribute { color: #79c0ff; }
.hljs-operator { color: #f47067; }
.hljs-punctuation { color: #c9d1d9; }

/* ---- Footer ---- */

.site-footer {
  margin-top: 4rem;
  padding: 1.5rem 1.25rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--muted);
}

/* ---- Responsive ---- */

@media (max-width: 600px) {
  .site-nav { gap: 1rem; }
  .hero { padding: 2rem 0 1.5rem; }
  .article-header h1 { font-size: 1.5rem; }
  .su-row { flex-direction: column; }
}