/* ==========================================================================
   Utilities
   ========================================================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-muted {
  color: var(--color-text-muted);
}

.error-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-7) var(--space-4);
  min-height: 40vh;
}

.error-page h1 {
  margin-bottom: var(--space-4);
}

.error-page p {
  margin-bottom: var(--space-5);
  color: var(--color-text-muted);
}

.empty-state {
  text-align: center;
  padding: var(--space-7) var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-base);
}

/* ==========================================================================
   Focus Styles
   ========================================================================== */

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-accent);
  color: #fff;
  font-size: var(--text-sm);
  border-radius: var(--radius);
  text-decoration: none;
  transition: top var(--duration-fast) ease;
}

.skip-link:focus {
  top: var(--space-2);
}

/* ==========================================================================
   Page Layout Helpers
   ========================================================================== */

.page-header {
  padding-top: var(--space-6);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-5);
}

.page-header h1,
.page-header h2 {
  margin-bottom: 0;
}

/* Hero */
.hero {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  padding: var(--space-8) calc(50vw - 50%) var(--space-7);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .hero {
    background-color: var(--color-surface-subtle);
  }
}

[data-theme="dark"] .hero {
  background-color: var(--color-surface-subtle);
}

.hero__name {
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.hero__tagline {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text);
  margin-bottom: var(--space-5);
}

.hero__bio {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: var(--prose-width);
  margin-bottom: var(--space-6);
}

.hero__cta {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-accent);
  text-decoration: none;
}

.hero__cta:hover {
  text-decoration: underline;
  color: var(--color-accent-hover);
}

.hero__cta:visited {
  color: var(--color-accent);
}

.post-body {
  padding-top: var(--space-5);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.view-all {
  margin-top: var(--space-5);
}

/* Blog Post Layout (two-column with sticky ToC) */
.post-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.post-layout > .page-header {
  grid-column: 1 / -1;
}

.post-sidebar {
  order: -1;
  margin-top: var(--space-5);
}

.post-content {
  min-width: 0;
}

@media (min-width: 64rem) {
  .post-layout {
    grid-template-columns: minmax(0, var(--prose-width)) 14rem;
    gap: var(--space-7);
  }

  .post-sidebar {
    order: 0;
    margin-top: 0;
  }

  .post-toc {
    position: sticky;
    top: var(--space-5);
    max-height: calc(100vh - var(--space-7));
    overflow-y: auto;
    margin-bottom: 0;
  }
}