/* ============================================================
   BUF Blog Stylesheet
   Matches the Manus-built site's palette and typography.
   ============================================================ */

:root {
  --color-buf-red:      oklch(42% .19 25);
  --color-buf-red-dark: oklch(36% .19 25);
  --color-steel-blue:   oklch(45% .10 240);
  --color-slate-navy:   oklch(30% .08 240);
  --color-sky-blue:     oklch(72% .08 230);
  --color-pale-blue:    oklch(93% .03 230);
  --color-soft-blue:    oklch(97% .01 230);
  --color-text:         oklch(20% .05 240);
  --color-text-2:       oklch(40% .05 240);
  --color-text-3:       oklch(55% .04 240);
  --color-bg:           var(--color-soft-blue);
  --color-bg-card:      #ffffff;
  --color-border:       oklch(88% .03 230);
  --font-display:       "Barlow Condensed", "Arial Narrow", system-ui, sans-serif;
  --font-body:          "Lora", Georgia, "Times New Roman", serif;
  --max-w:              1180px;
  --max-w-prose:        720px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-steel-blue); text-decoration: none; }
a:hover { color: var(--color-buf-red); }

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

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* ===== Header / Nav ===== */
.site-header {
  background: var(--color-slate-navy);
  color: #fff;
  padding: 18px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}
.site-header .nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.nav-logo img { height: 36px; width: auto; }
.nav-logo:hover { color: #fff; }
.site-header nav {
  display: flex;
  gap: 28px;
  align-items: center;
}
.site-header nav a {
  color: rgba(255,255,255,0.85);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.site-header nav a:hover { color: #fff; }
.site-header nav a.active {
  color: #fff;
  border-bottom: 2px solid var(--color-buf-red);
  padding-bottom: 4px;
}
.site-header nav a.nav-cta {
  background: var(--color-buf-red);
  color: #fff;
  padding: 8px 16px;
  border-radius: 4px;
}
.site-header nav a.nav-cta:hover { background: var(--color-buf-red-dark); }

@media (max-width: 760px) {
  .site-header nav { gap: 14px; font-size: 13px; }
  .site-header nav a:not(.nav-cta) { display: none; }
  .site-header nav a:first-child,
  .site-header nav a.active,
  .site-header nav a.nav-cta { display: inline-flex; }
}

/* ===== Blog hero ===== */
.blog-hero {
  background: linear-gradient(135deg, var(--color-slate-navy) 0%, var(--color-steel-blue) 100%);
  color: #fff;
  padding: 80px 0 60px;
  text-align: center;
}
.blog-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 64px);
  margin: 0 0 16px;
  line-height: 1;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  font-weight: 700;
}
.blog-hero p {
  font-size: 18px;
  max-width: 600px;
  margin: 0 auto;
  opacity: 0.92;
}
.blog-hero .back-link {
  display: inline-block;
  color: rgba(255,255,255,0.7);
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.blog-hero .back-link:hover { color: #fff; }

/* ===== Category pills ===== */
.category-pills {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 40px 0 32px;
  justify-content: center;
}
.category-pills a {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 8px 18px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: #fff;
  color: var(--color-text-2);
  font-weight: 500;
}
.category-pills a:hover {
  border-color: var(--color-steel-blue);
  color: var(--color-steel-blue);
}
.category-pills a.active {
  background: var(--color-slate-navy);
  border-color: var(--color-slate-navy);
  color: #fff;
}

/* ===== Post list / cards ===== */
.post-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
  margin-bottom: 80px;
}
.post-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.15s, box-shadow 0.15s;
}
.post-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(8, 30, 64, 0.08);
}
.post-card-link {
  display: block;
  padding: 28px 26px;
  color: inherit;
}
.post-card-link:hover { color: inherit; }
.post-card-category,
.post-category-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-buf-red);
  font-weight: 600;
  margin-bottom: 12px;
}
.post-card h2,
.post-card h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 10px;
  color: var(--color-slate-navy);
  letter-spacing: -0.005em;
}
.post-card time {
  display: block;
  font-size: 13px;
  color: var(--color-text-3);
  margin-bottom: 14px;
}
.post-card p {
  margin: 0 0 16px;
  color: var(--color-text-2);
  font-size: 15px;
  line-height: 1.55;
}
.post-card-cta {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-steel-blue);
  font-weight: 600;
}

/* ===== Single post page ===== */
.post-page {
  padding: 60px 24px 100px;
  max-width: var(--max-w-prose);
  margin: 0 auto;
}
.post-header { margin-bottom: 48px; }
.post-header .post-category-badge {
  display: inline-block;
  background: var(--color-pale-blue);
  padding: 6px 12px;
  border-radius: 4px;
  color: var(--color-steel-blue);
  text-decoration: none;
}
.post-header .post-category-badge:hover { color: var(--color-buf-red); }
.post-header h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 16px 0 16px;
  color: var(--color-slate-navy);
}
.post-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 14px;
  color: var(--color-text-3);
}

/* Post body — typography for reading */
.post-body {
  font-size: 18px;
  line-height: 1.75;
  color: var(--color-text);
}
.post-body p { margin: 0 0 1.4em; }
.post-body h2 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  margin: 2.2em 0 0.6em;
  color: var(--color-slate-navy);
  letter-spacing: -0.005em;
}
.post-body h3 {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  margin: 2em 0 0.5em;
  color: var(--color-slate-navy);
}
.post-body h4 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  margin: 1.8em 0 0.5em;
  color: var(--color-slate-navy);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.post-body ul, .post-body ol {
  margin: 0 0 1.4em;
  padding-left: 1.4em;
}
.post-body li { margin-bottom: 0.5em; }
.post-body blockquote {
  border-left: 4px solid var(--color-buf-red);
  padding: 4px 0 4px 24px;
  margin: 1.8em 0;
  font-style: italic;
  color: var(--color-text-2);
  font-size: 19px;
}
.post-body code {
  background: var(--color-pale-blue);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: ui-monospace, monospace;
}
.post-body pre {
  background: var(--color-slate-navy);
  color: #fff;
  padding: 18px 22px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 1.6em 0;
}
.post-body pre code { background: none; color: inherit; padding: 0; }
.post-body img {
  border-radius: 6px;
  margin: 1.8em auto;
}
.post-body a { color: var(--color-buf-red); border-bottom: 1px solid var(--color-buf-red); }
.post-body a:hover { color: var(--color-buf-red-dark); border-color: var(--color-buf-red-dark); }
.post-body hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 2.4em 0;
}
.post-body strong { color: var(--color-slate-navy); }

/* ===== Post footer / share / CTA ===== */
.post-footer {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}
.share {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.share span {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-3);
  font-weight: 500;
}
.share a, .share button {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 8px 14px;
  border: 1px solid var(--color-border);
  background: #fff;
  border-radius: 4px;
  color: var(--color-text-2);
  cursor: pointer;
  font-weight: 500;
}
.share a:hover, .share button:hover {
  border-color: var(--color-steel-blue);
  color: var(--color-steel-blue);
}
.post-cta {
  display: block;
  text-align: center;
  background: var(--color-buf-red);
  color: #fff;
  padding: 18px 24px;
  border-radius: 6px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.02em;
  font-weight: 600;
  text-transform: uppercase;
  margin-top: 16px;
}
.post-cta:hover {
  background: var(--color-buf-red-dark);
  color: #fff;
}

/* ===== Related posts ===== */
.related-posts {
  margin-top: 80px;
  padding-top: 48px;
  border-top: 1px solid var(--color-border);
}
.related-posts h2 {
  font-family: var(--font-display);
  font-size: 28px;
  margin: 0 0 28px;
  color: var(--color-slate-navy);
  text-transform: uppercase;
  letter-spacing: -0.005em;
}
.post-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.post-cards .post-card {
  padding: 22px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  display: block;
}
.post-cards .post-card h3 {
  font-size: 19px;
  margin: 8px 0 6px;
}
.post-cards .post-card time {
  font-size: 12px;
}

/* ===== Empty state ===== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-3);
  font-size: 18px;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-slate-navy);
  color: rgba(255, 255, 255, 0.85);
  margin-top: 80px;
  padding: 60px 0 30px;
}
.site-footer a { color: rgba(255, 255, 255, 0.85); }
.site-footer a:hover { color: #fff; }
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 36px;
}
.footer-grid strong {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  color: #fff;
}
.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-grid li { margin-bottom: 8px; font-size: 15px; }
.footer-grid p { margin: 0 0 12px; font-size: 15px; }
.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
}

@media (max-width: 600px) {
  .post-page { padding: 40px 20px 80px; }
  .post-header h1 { font-size: 32px; }
  .post-body { font-size: 17px; }
  .blog-hero { padding: 56px 0 44px; }
  .post-list { grid-template-columns: 1fr; gap: 20px; }
}