/* Shared reading-surface system: post/category/page/about share shell + title rules.
   Homepage remains an intentional exception. */

:root {
  --zp-reading-shell-max: 66rem;
  --zp-reading-shell-desktop-inline: 3rem;
}

.zp-reading-surface .zp-reading-shell {
  --content-width: var(--zp-reading-shell-max);
  width: min(calc(100% - var(--zp-reading-shell-desktop-inline)), var(--zp-reading-shell-max));
  max-width: var(--zp-reading-shell-max);
  margin-left: auto;
  margin-right: auto;
}

.zp-reading-title {
  margin: 0;
  color: var(--zp-text-strong);
  font-family: var(--zp-serif);
  font-size: var(--zp-reading-title-size-desktop);
  font-weight: var(--zp-font-weight-title);
  line-height: var(--zp-reading-title-line-height-desktop);
  letter-spacing: var(--zp-reading-title-letter-spacing);
}

.zp-reading-title:lang(zh),
.zp-reading-title [lang="zh"],
.zp-reading-title [lang^="zh-"] {
  font-family: var(--zp-serif);
}

.zp-reading-title:lang(ja),
.zp-reading-title [lang="ja"],
.zp-reading-title [lang^="ja-"] {
  font-family: var(--zp-jp-serif);
}

.zp-surface-section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 0.9rem 1.2rem;
  margin-bottom: 1rem;
}

.zp-surface-section-intro {
  min-width: 0;
  display: grid;
  gap: 0.42rem;
}

.zp-surface-section-label,
.zp-surface-section-kicker {
  color: color-mix(in srgb, var(--zp-text-faint) 88%, var(--zp-text-soft) 12%);
  font-family: var(--zp-serif);
  font-size: var(--zp-surface-section-label-size);
  line-height: var(--zp-leading-flat);
  letter-spacing: var(--zp-surface-section-label-letter-spacing);
  text-transform: uppercase;
}

.zp-surface-section-meta {
  color: var(--zp-text-quieter);
  font-family: var(--zp-serif);
  font-size: var(--zp-surface-section-meta-size);
  line-height: var(--zp-leading-meta);
  letter-spacing: var(--zp-list-meta-letter-spacing);
  white-space: nowrap;
}

.zp-surface-panel,
.zp-surface-panel--quiet {
  border: 1px solid color-mix(in srgb, var(--zp-line-soft) 82%, transparent);
  border-radius: var(--zp-surface-panel-radius);
  background: color-mix(in srgb, var(--zp-surface-strong) 56%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--zp-line-soft) 24%, transparent);
}

.zp-surface-panel--quiet {
  padding: var(--zp-surface-panel-padding);
}

.zp-surface-panel--plate {
  border: 1px solid color-mix(in srgb, var(--zp-line-strong) 48%, transparent);
  border-radius: var(--zp-surface-panel-radius);
  background: color-mix(in srgb, var(--zp-surface) 86%, transparent);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.04), inset 0 0 0 1px color-mix(in srgb, var(--zp-line-soft) 24%, transparent);
}

@media (max-width: 720px) {
  .zp-reading-surface .zp-reading-shell {
    --gap: 0px;
    width: 100%;
  }

  .zp-reading-title {
    font-size: var(--zp-reading-title-size-mobile);
    line-height: var(--zp-reading-title-line-height-mobile);
  }

  .zp-surface-section-head {
    align-items: start;
    flex-direction: column;
    margin-bottom: 0.9rem;
  }

  .zp-surface-section-meta {
    white-space: normal;
  }
}