/* Structural layout + responsive rules. Breakpoints: 768 / 1024 / 1440px */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-xxl);
  }
}

.page-body {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-section);
}

/* list page: filter rail + card grid */

.list-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .list-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--space-xxl);
  }
}

.list-main {
  flex: 1;
  min-width: 0;
}

.article-card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  margin-top: var(--space-lg);
}

@media (min-width: 768px) {
  .article-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .article-card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* top nav */

.top-nav {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.nav-menu {
  display: none;
  align-items: center;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .nav-menu {
    display: flex;
  }
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-hamburger {
  display: inline-flex;
}

@media (min-width: 768px) {
  .nav-hamburger {
    display: none;
  }
}

.nav-mobile-sheet {
  display: none;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-md) 0 var(--space-lg);
  border-top: 1px solid var(--color-hairline);
}

.nav-mobile-sheet.is-open {
  display: flex;
}

@media (min-width: 768px) {
  .nav-mobile-sheet {
    display: none !important;
  }
}

/* hero band */

.hero-band {
  padding: var(--space-xxl) 0;
}

@media (min-width: 768px) {
  .hero-band {
    padding: var(--space-section) 0;
  }
}

/* post detail body */

.post-body {
  max-width: 720px;
}

.post-body h1,
.post-body h2,
.post-body h3,
.post-body h4,
.post-body h5,
.post-body h6 {
  color: var(--color-ink);
  font-weight: 400;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.post-body h1 {
  font-size: 32px;
  line-height: 1.2;
}
.post-body h2 {
  font-size: 24px;
  line-height: 1.35;
}
.post-body h3 {
  font-size: 20px;
  line-height: 1.5;
}
.post-body h4,
.post-body h5,
.post-body h6 {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.4;
}

.post-body p {
  margin-bottom: var(--space-md);
}

.post-body ul,
.post-body ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
}

.post-body ul {
  list-style: disc;
}

.post-body ol {
  list-style: decimal;
}

.post-body li {
  margin-bottom: var(--space-xxs);
}

.post-body blockquote {
  border-left: 3px solid var(--color-hairline);
  padding-left: var(--space-md);
  margin-bottom: var(--space-md);
  color: var(--color-muted);
}

.post-body pre {
  background-color: var(--color-surface-soft);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
}

.post-body code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
}

.post-body :not(pre) > code {
  background-color: var(--color-surface-soft);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
}

.post-body img {
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--color-hairline);
  margin: var(--space-xl) 0;
}

/* footer */

.footer {
  padding: var(--space-xxl) 0 var(--space-xl);
  border-top: 1px solid var(--color-hairline);
}