/* Preview-only layout; PHP's canonical styles and approved art are unchanged. */
html { scroll-behavior: smooth; scroll-padding-top: 110px; }
.skip-link { position: absolute; top: -100px; left: 12px; z-index: 300; background: var(--color-bg); padding: 12px; }
.skip-link:focus { top: 8px; }
.preview-bar { background: var(--color-text); color: var(--color-bg); display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 10px max(24px,calc((100vw - 1160px)/2)); font: 11px/1.4 var(--font-mono); letter-spacing: .07em; }
.preview-bar a { color: inherit; text-decoration: underline; white-space: nowrap; }
.article-hero { padding-bottom: 30px; }
.article-hero h1 { font-size: clamp(46px,6vw,82px); max-width: 16ch; }
.article-hero .article-meta { margin-top: 26px; }
.article-hero-image.floor-hero { aspect-ratio: auto; margin-block: 36px 8px; }
.floor-hero picture { display: contents; }
.floor-hero img { display: block; width: 100%; height: auto; object-fit: contain; }
.floor-hero figcaption { padding: 12px 16px; font: 12px/1.6 var(--font-mono); color: var(--color-text-muted); background: var(--color-surface-2); }
.reading-nav { max-width: 860px; margin: 0 auto; padding: 16px 24px; display: flex; gap: 12px 24px; flex-wrap: wrap; border-block: 1px solid var(--color-divider); font: 12px/1.5 var(--font-mono); }
.reading-nav a { color: var(--color-text-muted); text-underline-offset: 4px; }
.article-body { max-width: 908px; padding-top: 32px; }
.article-body > p, .article-body > h2, .article-body > h3, .article-body > ul, .short-answer, .study-link, .arithmetic-card, .source-list { max-width: 720px; margin-inline: auto; }
.article-body > h2 { font-size: clamp(28px,3.4vw,38px); }
.article-body ul { padding-left: 24px; }
.article-body li + li { margin-top: 18px; }
.article-body li p { margin: 0; }
.short-answer { background: var(--color-surface-2); border-left: 3px solid var(--color-primary); padding: 26px 30px; }
.short-answer p + p { margin-top: 16px; }
.article-body .box-label { font: 12px/1.5 var(--font-mono); letter-spacing: .08em; color: var(--color-text-muted); margin-bottom: 14px; }
.article-body .study-link { margin-block: 24px 40px; padding: 18px 20px; border: 1px solid var(--color-border); font-size: 14px; }
.article-body .study-link strong { display: block; margin-bottom: 5px; }
.article-body .study-link a { font-weight: 600; }
.article-body .photo-note { border-left: 2px solid var(--color-divider); padding: 12px 16px; background: var(--color-surface); color: var(--color-text-muted); font-size: 13px; line-height: 1.6; }
.approved-figure { width: 100%; }
.figure-open { display: block; width: 100%; border: 0; padding: 0; background: transparent; cursor: zoom-in; border-radius: var(--radius-md); }
.figure-open:focus-visible { outline: 3px solid var(--color-primary); outline-offset: 5px; }
.article-body .approved-figure img { display: block; height: auto; object-fit: contain; }
.article-body .approved-figure figcaption { text-align: left; font: 13px/1.65 var(--font-body); letter-spacing: 0; max-width: 720px; margin-inline: auto; }
.arithmetic-card { padding: 26px 30px; background: var(--color-surface); border-left: 3px solid var(--color-primary); }
.arithmetic-card p + p { margin-top: 18px; }
.arithmetic-card p { font-size: 16px; }
.article-body > .source-list { padding-top: 0; margin-top: 24px; }
.source-list > p:first-child { margin-top: 0; }
.source-list p { font-size: 14px; margin-top: 22px; overflow-wrap: anywhere; }
sup a { padding-inline: 1px; }
.editor-cover { max-width: 860px; margin: 0 auto 80px; border-block: 1px solid var(--color-divider); padding: 20px 24px; color: var(--color-text-muted); }
.editor-cover summary { cursor: pointer; font: 12px/1.6 var(--font-mono); }
.editor-cover > div { padding-top: 20px; }
.editor-cover p, .editor-cover li { margin-block: 12px; font-size: 14px; line-height: 1.65; }
.editor-cover h2 { font-size: 24px; margin-top: 20px; }
.editor-cover ul { padding-left: 22px; }
.preview-menu { display: none; font: 12px var(--font-mono); border: 1px solid var(--color-divider); padding: 10px; border-radius: 4px; background: transparent; color: var(--color-text); }
.figure-dialog { max-width: 96vw; width: 1500px; max-height: 94vh; padding: 14px; border: 1px solid var(--color-divider); border-radius: 6px; background: var(--color-bg); color: var(--color-text); }
.figure-dialog::backdrop { background: rgb(0 0 0 / .75); }
.figure-dialog form { display: flex; justify-content: flex-end; margin-bottom: 12px; }
.close-figure { padding: 10px 18px; color: var(--color-text); border: 1px solid var(--color-border); background: var(--color-surface); border-radius: 4px; cursor: pointer; font: 13px var(--font-mono); }
.zoom-scroll { overflow: auto; max-height: calc(94vh - 85px); }
.zoom-scroll img { display: block; width: 100%; min-width: 760px; max-width: none; height: auto; }
@media(max-width:800px) {
  .preview-menu { display: inline-block; }
  .nav-actions > .btn { display: none; }
  .site-header .nav { position: relative; }
  .site-header.menu-open .nav-links { display: flex; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; align-items: stretch; padding: 20px 24px; background: var(--color-bg); border-bottom: 1px solid var(--color-divider); z-index: 50; }
}
@media(max-width:540px) {
  .preview-bar { padding: 10px 16px; font-size: 9px; gap: 8px; }
  .brand-name { max-width: 185px; font-size: 14px; }
  .brand-tag { font-size: 9px; }
  .brand-mark { width: 28px; min-width: 28px; }
  .nav-actions { gap: 7px; }
  .article-hero { padding-top: 42px; }
  .article-hero h1 { font-size: 49px; }
  .article-body p { font-size: 16px; line-height: 1.75; }
  .short-answer, .arithmetic-card { padding: 22px 18px; }
  .reading-nav { gap: 12px 18px; font-size: 11px; }
  .article-body .photo-note, .article-body .source-list p { font-size: 13px; }
  .article-body .box-label { font-size: 11px; }
}
@media(prefers-reduced-motion:reduce) { html { scroll-behavior: auto; } }
@media print {
  .preview-bar, .site-header, .site-footer, .reading-nav, .editor-cover { display: none; }
  .article-body, .article-hero { padding-block: 12px; }
  .approved-figure, .arithmetic-card { break-inside: avoid; }
}

/* Only Part 2 reading-layout refinements; inherits the existing PHP system. */
.article-hero h1 { max-width: 19ch; }
.article-body .short-answer { margin-block: 28px; }
.article-body .short-answer p { max-width: none; }
.article-body h3 { font-family: var(--font-body); font-size: 21px; font-weight: 600; line-height: 1.35; letter-spacing: -.015em; margin-top: 30px; }
.article-body picture { display: contents; }
.article-body .source-list { padding-top: 0; margin-top: 18px; }
.article-body #sources { margin-bottom: 0; }
.preview-status { max-width: 860px; margin: 24px auto 60px; padding: 22px 24px; border: 1px solid var(--color-border); color: var(--color-text-muted); }
.preview-status strong { font: 12px/1.6 var(--font-mono); text-transform: uppercase; letter-spacing: .05em; }
.preview-status p { margin-top: 10px; font: 14px/1.65 var(--font-body); max-width: 68ch; }
.feed-review { padding-block: 64px 80px; }
.feed-review h1 { font-size: clamp(38px,5vw,64px); margin-block: 18px; }
.feed-intro { max-width: 65ch; line-height: 1.7; }
.feed-review-grid { display: grid; grid-template-columns: minmax(0,1.2fr) minmax(0,1fr); gap: 60px; margin-top: 40px; }
.feed-review-grid .post-card { display: block; }
.feed-review-grid .thumb { margin-bottom: 24px; }
.feed-review-grid picture { display: contents; }
.feed-notes { padding-top: 24px; }
.feed-notes h2 { font-size: 28px; margin-bottom: 20px; }
.feed-notes p { line-height: 1.7; margin-block: 20px; }
.feed-notes a, .preview-status a { color: var(--color-primary-hover); text-decoration: underline; text-underline-offset: 4px; }
@media(max-width:800px) {
  .feed-review-grid { grid-template-columns: 1fr; gap: 24px; }
}
@media(max-width:540px) {
  .article-hero h1 { font-size: clamp(38px, 10vw, 49px); }
  .article-body h3 { font-size: 20px; }
  .preview-status { margin-inline: 16px; width: calc(100% - 32px); }
}