/* SmartAEO blog — layout, listing, and prose. Built on the shared design tokens
 * (design-system.css must be linked first). Semantic colors are rgb-channel
 * tokens → rgb(var(--token)); the brand color scales are raw hex → var(--token). */

.blog-body {
  background: rgb(var(--surface-1));
  color: rgb(var(--text-strong));
  font-family: var(--font-sans);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.blog-main {
  flex: 1 0 auto;
}

/* ---- Header ---- */
.blog-header {
  border-bottom: 1px solid rgb(var(--border-subtle));
  background: rgb(var(--surface-1) / 0.85);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.blog-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}
.blog-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
}
.blog-nav a {
  color: rgb(var(--text-muted));
  transition: color 0.15s ease;
}
.blog-nav a:hover,
.blog-nav a[aria-current='page'] {
  color: rgb(var(--text-strong));
}
.blog-nav__cta {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-lg);
  background: var(--primary-600);
  color: #fff !important;
  box-shadow: var(--shadow-sm);
}
.blog-nav__cta:hover {
  background: var(--primary-700);
}

/* ---- Shared bits ---- */
.blog-wrap,
.blog-article {
  padding-top: 3.5rem;
  padding-bottom: 4.5rem;
}
.blog-eyebrow {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary-600);
  margin: 0 0 0.5rem;
}
.blog-lede {
  font-size: 1.125rem;
  line-height: 1.6;
  color: rgb(var(--text-muted));
  max-width: 42rem;
}

/* ---- Listing ---- */
.blog-hero {
  max-width: 46rem;
  margin-bottom: 2.5rem;
}
.blog-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 0 0 0.75rem;
}
.blog-empty {
  color: rgb(var(--text-muted));
}
.blog-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}
.blog-card__link {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  height: 100%;
  padding: 1.5rem;
  border: 1px solid rgb(var(--border-subtle));
  border-radius: var(--radius-lg);
  background: rgb(var(--surface-1));
  box-shadow: var(--shadow-sm);
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease,
    border-color 0.15s ease;
}
.blog-card__link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-600);
}
.blog-card__meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8125rem;
  color: rgb(var(--text-muted));
}
.blog-card__tag {
  padding: 0.1rem 0.55rem;
  border-radius: var(--radius-full, 999px);
  background: var(--primary-50);
  color: var(--primary-700);
  font-weight: 600;
  font-size: 0.75rem;
}
.blog-card__title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
  color: rgb(var(--text-strong));
}
.blog-card__desc {
  margin: 0;
  color: rgb(var(--text-muted));
  line-height: 1.55;
  font-size: 0.9375rem;
}
.blog-card__more {
  margin-top: auto;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--primary-600);
}

/* ---- Article ---- */
.blog-article {
  max-width: 46rem;
}
.blog-back {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-weight: 600;
  font-size: 0.875rem;
  color: rgb(var(--text-muted));
}
.blog-back:hover {
  color: rgb(var(--text-strong));
}
.blog-post-head {
  margin-bottom: 2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid rgb(var(--border-subtle));
}
.blog-post-head h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 4.5vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin: 0.75rem 0;
}

/* ---- Prose (rendered markdown) ---- */
.prose {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: rgb(var(--text-strong));
}
.prose > * + * {
  margin-top: 1.25rem;
}
.prose h2 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 2.5rem;
  margin-bottom: 0.5rem;
}
.prose h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 0.4rem;
}
.prose a {
  color: var(--primary-600);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.prose a:hover {
  color: var(--primary-700);
}
.prose ul,
.prose ol {
  padding-left: 1.4rem;
}
.prose li + li {
  margin-top: 0.4rem;
}
.prose blockquote {
  margin: 0;
  padding: 0.5rem 1.25rem;
  border-left: 3px solid var(--secondary-500);
  color: rgb(var(--text-muted));
  font-style: italic;
}
.prose code {
  font-family: var(--font-mono, ui-monospace, monospace);
  font-size: 0.9em;
  background: rgb(var(--surface-3));
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-sm, 6px);
}
.prose pre {
  background: rgb(var(--surface-3));
  padding: 1rem 1.25rem;
  border-radius: var(--radius-lg);
  overflow-x: auto;
}
.prose pre code {
  background: none;
  padding: 0;
}
.prose img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
}
.prose hr {
  border: none;
  border-top: 1px solid rgb(var(--border-subtle));
  margin: 2.5rem 0;
}

/* ---- Footer ---- */
.blog-footer {
  border-top: 1px solid rgb(var(--border-subtle));
  background: rgb(var(--surface-2));
  margin-top: auto;
}
.blog-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  padding-top: 1.75rem;
  padding-bottom: 1.75rem;
}
.blog-footer__links {
  display: flex;
  gap: 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: rgb(var(--text-muted));
}
.blog-footer__links a:hover {
  color: rgb(var(--text-strong));
}
.blog-footer__copy {
  margin-left: auto;
  font-size: 0.8125rem;
  color: rgb(var(--text-muted));
}