@import url('https://fonts.googleapis.com/css2?family=Geist:wght@300;400;500;600;700&family=Geist+Mono:wght@300;400;500&display=swap');

/* ── Tokens (link42 design system) ── */
[data-theme="light"] {
  --bg: #ffffff;
  --bg-subtle: #f8f8f7;
  --bg-card: #ffffff;
  --bg-hover: #f3f3f2;
  --bg-active: #ebebea;
  --border: #e8e8e6;
  --border-strong: #d4d4d0;
  --text: #1a1a1a;
  --text-mid: #57534e;
  --text-dim: #a8a29e;
  --text-inv: #ffffff;
  --accent: #2563eb;
  --accent-bg: #eff6ff;
  --accent-border: #bfdbfe;
  --green: #16a34a;
  --green-bg: #f0fdf4;
  --green-border: #bbf7d0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
}

[data-theme="dark"] {
  --bg: #111110;
  --bg-subtle: #1a1a19;
  --bg-card: #1c1c1b;
  --bg-hover: #242423;
  --bg-active: #2c2c2b;
  --border: #282826;
  --border-strong: #343432;
  --text: #ededed;
  --text-mid: #a09f9b;
  --text-dim: #5c5b57;
  --text-inv: #111110;
  --accent: #3b82f6;
  --accent-bg: #1e2e4a;
  --accent-border: #1d4ed8;
  --green: #22c55e;
  --green-bg: #14291e;
  --green-border: #166534;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ── Layout ── */
.page { min-height: 100vh; display: flex; flex-direction: column; }
.main { flex: 1; }

/* ── Header ── */
.header {
  height: 50px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 20;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.03em;
  margin-right: 16px;
  flex-shrink: 0;
}

.logo img { height: 28px; width: auto; }
.logo span { color: var(--text-dim); font-weight: 400; }

.nav {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav a {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-mid);
  padding: 5px 9px;
  border-radius: 6px;
  letter-spacing: -0.01em;
  transition: background 0.1s, color 0.1s;
}

.nav a:hover { background: var(--bg-hover); color: var(--text); }
.nav a.active { color: var(--text); background: var(--bg-hover); }

.theme-toggle {
  margin-left: auto;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  color: var(--text-mid);
  font-size: 16px;
  transition: background 0.15s;
  flex-shrink: 0;
}

.theme-toggle:hover { background: var(--bg-hover); }

.nav-toggle {
  display: none;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  color: var(--text-mid);
  margin-left: auto;
  margin-right: 8px;
}

.nav-toggle:hover { background: var(--bg-hover); }

/* ── Footer ── */
.footer {
  padding: 20px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-left { font-size: 12px; color: var(--text-dim); }

.footer-right { display: flex; gap: 16px; }

.footer-right a {
  font-size: 12px;
  color: var(--text-dim);
  transition: color 0.15s;
}

.footer-right a:hover { color: var(--text-mid); }

/* ── Profile / Homepage ── */
.profile {
  padding: 80px 24px 60px;
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
}

.profile-img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border);
  margin-bottom: 20px;
}

.profile-name {
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.035em;
  margin-bottom: 4px;
}

.profile-handle {
  font-family: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.profile-tagline {
  font-size: 15px;
  color: var(--text-mid);
  line-height: 1.65;
  max-width: 500px;
  margin: 0 auto 24px;
  font-style: italic;
}

/* ── Social links ── */
.social-links {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text-mid);
  transition: all 0.15s;
}

.social-link:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
  color: var(--text);
}

.social-link svg { width: 16px; height: 16px; }

/* ── Recent posts ── */
.recent {
  padding: 0 24px 80px;
  max-width: 700px;
  margin: 0 auto;
}

.section-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.post-card {
  display: block;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 12px;
  background: var(--bg-card);
  transition: box-shadow 0.2s, border-color 0.2s;
}

.post-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.post-card.has-img {
  display: flex;
  gap: 16px;
  align-items: center;
}

.post-card-img {
  width: 80px;
  height: 80px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.post-card-body { flex: 1; min-width: 0; }

.post-card-title {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.post-card-meta {
  font-size: 12px;
  color: var(--text-dim);
}

.post-card-desc {
  font-size: 13px;
  color: var(--text-mid);
  line-height: 1.55;
  margin-top: 8px;
}

.view-all {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-top: 16px;
  padding: 8px 0;
}

.view-all:hover { text-decoration: underline; }

/* ── Blog list ── */
.blog-list {
  padding: 60px 24px 80px;
  max-width: 700px;
  margin: 0 auto;
}

.blog-list h1 {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.blog-list-sub {
  font-size: 15px;
  color: var(--text-mid);
  margin-bottom: 40px;
}

.year-group { margin-bottom: 32px; }

.year-label {
  font-family: 'Geist Mono', ui-monospace, monospace;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-dim);
  margin-bottom: 12px;
}

/* ── Taxonomy / categories ── */
.tax-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.tax-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-mid);
  transition: all 0.15s;
}

.tax-chip:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
  color: var(--text);
}

.tax-count {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-dim);
  background: var(--bg-subtle);
  padding: 1px 6px;
  border-radius: 10px;
}

/* ── Article / Post ── */
.article {
  padding: 60px 24px 80px;
  max-width: 740px;
  margin: 0 auto;
}

.article-header { margin-bottom: 40px; }

.article-title {
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.2;
  margin-bottom: 12px;
}

.article-meta {
  font-size: 13px;
  color: var(--text-dim);
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.article-cover {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 32px;
}

/* ── Pills / tags ── */
.pill {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-subtle);
  color: var(--text-dim);
  margin-bottom: 8px;
}
.pill-ai {
  border-color: color-mix(in srgb, var(--link) 30%, transparent);
  background: color-mix(in srgb, var(--link) 8%, var(--bg));
  color: var(--link);
}

/* ── Table of contents ── */
.toc {
  margin-bottom: 40px;
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-subtle);
}

.toc-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.toc nav ul { list-style: none; padding-left: 0; }
.toc nav ul ul { padding-left: 16px; }

.toc nav a {
  font-size: 13px;
  color: var(--text-mid);
  display: block;
  padding: 3px 0;
  transition: color 0.15s;
}

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

/* ── Prose content ── */
.content h2 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.content h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-top: 36px;
  margin-bottom: 12px;
}

.content h4 {
  font-size: 15px;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 10px;
}

.content p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-mid);
  margin-bottom: 16px;
}

.content strong { color: var(--text); font-weight: 600; }

.content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.content a:hover { opacity: 0.8; }

.content ul, .content ol {
  padding-left: 24px;
  margin-bottom: 16px;
}

.content li {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-mid);
  margin-bottom: 4px;
}

.content li strong { color: var(--text); }

.content blockquote {
  border-left: 3px solid var(--border-strong);
  padding: 8px 16px;
  margin: 16px 0;
  color: var(--text-mid);
  font-style: italic;
}

.content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 32px 0;
}

.content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin: 16px 0;
}

.content pre {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  margin: 16px 0;
  font-family: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 13px;
  line-height: 1.6;
}

.content code {
  font-family: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 12.5px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
}

.content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 13px;
}

.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 13px;
}

.content th {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  padding: 10px;
  border-bottom: 2px solid var(--border);
  text-align: left;
}

.content td {
  padding: 10px;
  border-bottom: 1px solid var(--border);
  color: var(--text-mid);
}

.content tr:hover { background: var(--bg-hover); }

.content iframe {
  max-width: 100%;
  margin: 16px 0;
  border-radius: 10px;
}

/* ── PDF embed ── */
.pdf-embed { margin: 16px 0; }

.pdf-embed iframe {
  width: 100%;
  height: 600px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.pdf-fallback {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--accent);
}

/* ── Page (about, stack) ── */
.page-content {
  padding: 60px 24px 80px;
  max-width: 740px;
  margin: 0 auto;
}

.page-title {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 32px;
}

/* ── Pagination ── */
.pagination {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.pagination a {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-mid);
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all 0.15s;
  max-width: 50%;
}

.pagination a:hover {
  background: var(--bg-hover);
  border-color: var(--border-strong);
  color: var(--text);
}

.prev-label, .next-label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  display: block;
  margin-bottom: 4px;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .header { padding: 0 16px; }
  .nav-toggle { display: flex; }

  .nav {
    display: none;
    position: absolute;
    top: 50px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 8px 16px;
    flex-direction: column;
    gap: 0;
    z-index: 19;
  }

  .nav.open { display: flex; }
  .nav a { padding: 10px 8px; }

  .profile { padding: 48px 20px 40px; }
  .profile-img { width: 96px; height: 96px; }
  .recent { padding: 0 20px 60px; }
  .blog-list { padding: 40px 20px 60px; }
  .article { padding: 40px 20px 60px; }
  .page-content { padding: 40px 20px 60px; }
  .footer { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .post-card { padding: 14px; }
  .article-title { font-size: 22px; }
  .content h2 { font-size: 19px; }
  .content h3 { font-size: 16px; }
  .pdf-embed iframe { height: 400px; }
}