We need respond with rewritten CSS. Must preserve selectors/layout. Need target editorial-magazine + tight-rhythm. Original file has specific values. Need change visual identity. Need be careful responsive: Note in @media max-width 1024, .feature-list, .partner-grid, .stats-grid have grid-template-columns but original feature-list display flex, partner flex, stats flex. These are layout display? Grid-template-columns on flex doesn't apply. But preserve exact selectors and declarations? They likely attempted to change layout? Wait we cannot change display/grid-template-columns? But original includes declarations in media queries with grid-template-columns !important while base display flex. We must preserve exactly? The instructions say preserve layout exact, class names etc. It says grid-template-columns must match HTML children; but original already has these. Need not change values? The task says "Keep ALL selectors and layout exactly as-is. Only change colors..." So don't alter layout declarations. But need visual identity: colors/shadows/radius. Could update only color etc. However requested effects: tight-rhythm compact spacing? But spacing is layout? padding/margin can change ±20%. But original has spacing already compact-ish (space-card 1.25rem etc). Could adjust within 20%. But target editorial-magazine and tight-rhythm maybe more compact padding? Need not aggressive due conservative. Need create fresh palette different from existing other files. They say "Other files already used: editorial-magazine+gradient-rich. This file's specific values (column counts, gaps, hex codes, shadow specs) MUST differ." Need choose something perhaps editorial neutrals cream/ink + olive or deep red. But need maybe different hex codes. We can use #f4efe6 background, #1a1a1a text, #a63d2f accent, #5e6b52 olive. Need implement via root and shorthand. Need color all values replaced. But there are rgba vars. Need replace all colors in file including border, hover, cta surface.

Need define palette as editorial creative? Maybe deep burgundy? Let's design.

Original palette royal purple. Need new palette "Editorial Olive + Ink" maybe:
--color-primary: #6b705c (olive)
--color-primary-dark: #4a4e39
--color-accent: #c44536 (deep red)
--color-surface: #f5f1e8 (cream)
--color-text: #201f1d (ink)
--rgb-primary: 107,112,92
--rgb-accent: 196,69,54
Radius tight: --radius-sm: 2px; --radius-md: 4px; --radius-lg: 6px; --radius-xl: 8px. Since editorial magazine plus tight rhythm small radius 2-6. But original has 0/2/4/6, need "more distinct" and tight rhythm 2-6. Could use 2,3,5,7? Need small. Let's set sm 1? Border width not change. radius doesn't affect layout. Use --radius-sm: 2px; --radius-md: 4px; --radius-lg: 6px; --radius-xl: 9px? But tight target says 2-6. Maybe use 2/3/5/7? Need distinct from previous (0,2,4,6). Use 2/4/6/8 is also not hugely distinct. Could set 3/5/7/9? Tight says small 2-6; 9 too large. Use 2px, 3px, 5px, 6px. Need original had 0,2,4,6. Diff. Good.
Shadows: subtle or none. Need redesign multi-layer? Since tight-rhythm says subtle shadows or none. But prompt says "Shadows redesigned (different offsets, colors)" and "box-shadow ... fully redesign with multi-layer effects". Can combine subtle multi-layer with olive/brown tinted shadows. Need preserve variables and usages. We can alter variable values. Example:
--shadow-sm: 0 1px 2px rgba(58,54,46,.06);
--shadow-md: 0 1px 2px rgba(58,54,46,.08), 0 2px 4px rgba(58,54,46,.05);
--shadow-lg: 0 2px 4px rgba(58,54,46,.06), 0 4px 8px rgba(58,54,46,.04);
But previous subtle. Need "more distinct" maybe stronger? tight-rhythm says subtle shadows or none. We can use warm charcoal with olive tint. Need maybe use rgba(45,43,38,.08), etc.

Need transitions: original 0.1s ease. Need change to maybe 0.18s cubic-bezier(.4,0,.2,1) or 0.2s ease-out. Tight rhythm maybe 0.15s. Need preserve transition duration change. Need ensure various uses.

Need maybe add text-shadow? Original no text-shadow. Could add? The visual changes list includes text-shadow but optional. But if we add to headings maybe. However no selectors to add? Could modify existing rule h1,h2... to include text-shadow? That changes "only colors" but allowed. But need no new selectors? We can preserve selectors and adjust declarations. Better avoid adding text-shadow unless necessary. But maybe need visual redesign. Could add a subtle text-shadow to h1,h2,h3,h4 or body. Yet target editorial with ink text can use no text-shadow. But prompt says changes "text-shadow" maybe not required. Need output all CSS same selectors.

Need additional color values inside .card border: rgba(var(--rgb-primary), .08). Need update to maybe .12? Border-color only can change. But maybe need change color value not layout. Use rgba(var(--rgb-primary), .12). Similarly no original border width.

Need body line-height unchanged? original --body-line-height 1.65, must preserve? Typography cannot change. Keep same or maybe within? Instructions say font-family, font-size, font-weight, line-height unchanged. So keep line-height. --heading-weight 800. Keep. --body-line-height 1.65. Keep. --space values maybe within ±20? Need decide. Original root: --space-section: 3rem; --space-card: 1.25rem; --space-gap: 1rem. Target tight-rhythm compact: could set section 2.5rem? But ±20% of 3 is 2.4–3.6. So 2.75 rem acceptable. card 1.25 ±20 = 1 to 1.5. Could keep or make 1.15? gap 1 ±20 = 0.8 to 1.2. Could set .9. Responsive 640: section 2rem -> target? Keep? Original 2rem, inside media allowed? Visual? Could keep, but maybe adjust 1.75? But if we change need within ±20% of 2? 1.75 within. But we should preserve? It's spacing (margin/padding? padding via --space-section). Prompt says change visual identity but layout spacing can change ±20. We could keep to avoid altering layout. However target tight-rhythm requires compact. Maybe adjust --space-section: 2.75rem, --space-card: 1.15rem, --space-gap: .875rem. Need maybe also page-main max-width 1200 unchanged? max-width cannot change? It says max-width cannot change? Actually list: width, height, min/max-width... cannot change? It says keep similar values ±20%. So max-width 1200 can be changed? It says "width, height, min/max-width, min/max-height" under layout cannot change. But "keep similar values" maybe ±20? We could leave 1200. The target editorial wide 1200-1400 but "conservative" means no layout changes. Keep 1200.
Need also grid-template-columns not change. But "Other files already used ... column counts... MUST differ" from other file, not original. User explicitly: "This file's specific values (column counts, gaps, hex codes, shadow specs) MUST differ." Wait that means our new output must differ from any other file already used? It says other files already used editorial-magazine+gradient-rich. This file's specific values (column counts, gaps, hex codes, shadow specs) MUST differ. Could mean don't reuse exact same palette. We don't know other file. We'll use unique olive/deep red. We don't need change column counts because they were in original, and layout fixed. The "other files" likely loaded? Hmm.

Need note original includes comment "CSSVariantEngine v3.0..." and palette. We need output rewritten CSS. Should we preserve comments? We can rewrite comments maybe? The instructions don't forbid comments. But no AI marker comments. We can change comments perhaps to reflect new palette. Could keep comments? The original comment line "Palette: royal | Radius: sharp..." should be replaced with "Palette: editorial-olive | Radius: tight | Shadow: soft-warm". This isn't AI comment. But maybe no need. We need preserve selectors. We can include comments as original. But output should be only CSS; comments allowed. The statement "No  comments" means don't add marker. We can update comments. Maybe simpler include relevant comment. But original includes "Section Layout Variants" etc. We can preserve.

Need check exact selectors. There is weird leading spaces for some rules. Need preserve class names and selectors. We can normalize whitespace but keep selectors. Need preserve all media queries and rules. We should output same selectors:

:root { ... }

/* 基础覆盖 */
body { ... }
h1, h2, h3, h4 { ... }
section, .section { ... }
.card, [class*="card"] { ... }
.btn, button[class*="btn"], a[class*="btn"] { ... }
a:not([class]) { ... }

/* ========== Section Layout Variants ========== */

/* news: featured-top */
/* 首篇横跨全宽 */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-gap); }
.news-grid > *:first-child { grid-column: span 3; }

/* features: horizontal */
/* 水平滚动 */
.feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
.feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: centered */
.hero-content { text-align: center; max-width: 800px; margin: 0 auto; }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
.testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* stats: inline */
/* 水平排列 */
.stats-grid { display: flex; justify-content: center; gap: 3rem; }

/* cta: card-style */
.cta-inner { background: var(--color-surface); border-radius: var(--radius-xl); padding: 3rem; text-align: center; }

/* Page Layout: full-width */
/* 无侧边栏, 全宽 */
.page-main { max-width: 1200px; margin: 0 auto; }

/* 条件性装饰 */
a:not([class]):hover { color: var(--color-accent); }
.card { border: 1px solid rgba(var(--rgb-primary), .12); }

/* Responsive */
@media (max-width: 1024px) {
    .news-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .feature-list { grid-template-columns: repeat(2, 1fr) !important; }
    .partner-grid { grid-template-columns: repeat(3, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .hero-inner { grid-template-columns: 1fr !important; }
}
@media (max-width: 640px) {
    :root { --space-section: 2rem; --space-card: 1rem; --space-gap: 0.75rem; }
    .news-grid { grid-template-columns: 1fr !important; }
    .feature-list { grid-template-columns: 1fr !important; }
    .faq-list { grid-template-columns: 1fr !important; }
    .testimonial-list { column-count: 1 !important; }
    .partner-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .cta-inner { grid-template-columns: 1fr !important; }
}

Need maybe change cta-inner background to cream yes. CTA padding 3rem? Keep same. But tight-rhythm compact? Could reduce to 2.5rem? But layout changed in media weird. Padding can change ±20%? 3rem to 2.5 is 17% within. Could do. But cta-inner "padding: 3rem" perhaps not definitely compact. Since tight-rhythm wants compact, we can set 2.75rem? But "Generous outer padding" target editorial magazine perhaps 40-80px. Hmm conflicting. Conservative: Could leave 3rem. Better change visual identity not layout.

Need maybe add "accent-color" and "caret-color" declarations? There are no inputs. Could add to body? That creates new declaration not new selector. Allowed? Maybe we can set accent-color: var(--color-accent); caret-color: var(--color-accent); on body or :root. This is a visual property. Should we? Could add to body. But if we add declarations, preserve layout. But maybe not necessary. The instructions mention caret-color, accent-color specifically. We can add to body { color: var(--color-text); line-height: var(--body-line-height); accent-color: var(--color-accent); caret-color: var(--color-accent); } However this is adding. Allowed? It changes visual identity. Need be careful no selector changes. Good.
Need maybe add outline style? If adding outline to .card? Not necessary. But outline could alter layout? no. Better avoid.

Need maybe add "filter/backdrop-filter" maybe not.

Need maybe incorporate "gradient" maybe target "gradient-rich" other file, but this variant isn't gradient. However original didn't have gradients. Could change cta-inner background to linear-gradient? That would be visual, allowed. But target editorial-magazine + tight-rhythm: could use subtle gradient to create texture: linear-gradient(135deg, #faf7f0, #efe9dd). But prompt says change gradient colors and stops; original none. Could add a gradient to cta-inner. But if cta-inner background via var(--color-surface) currently. Maybe we can set --color-surface to a gradient? CSS custom property can be gradient? Yes `background: var(--color-surface)` if var is `linear-gradient(...)` works? Actually custom property value can be gradient. But maybe better `--color-surface: #f6f1e6;` for all backgrounds. Use gradient directly in cta-inner. But if other rules use var(--color-surface), changing var to gradient would affect gradient. Could set `--color-surface: #f4efe6;` and cta-inner `background: linear-gradient(145deg, #f7f3ec, #e9e1d3);` But then in cta-inner code, background changes from var. Allowed? yes. But maybe target editorial mag often subtle paper tones. We'll do.

Need maybe alter line-height? No.
Need perhaps change `--heading-weight` from 800? Typography no. Keep 800. Maybe target editorial usually bold but okay.
Need root --rgb-primary and --rgb-accent values must correspond to new colors. For rgba border. Set --rgb-primary: 107,112,92; --rgb-accent: 196,69,54.

Need choose color values:
--color-primary: #5f6b52 (olive)
--color-primary-dark: #434b38 (dark olive)
--color-accent: #b8503d? Deep red. Need enough contrast with cream. Deep red #a93e33 maybe. Editorial "c44536" from prompt. But "specific values MUST differ" from other file; use #b54433? There is also c44536. We can use #b0402f or #a63d2f.
--color-surface: #f5f0e7
--color-text: #1d1c19 (ink)
Maybe background? There's no body background. Could add background to body? Original body no background. Need maybe set background color. Since no layout. Should we add? Yes visual. But "preserving selectors" can add declaration. Could set body { color: var(--color-text); line-height: var(--body-line-height); background-color: #f7f3eb; } This is not in original. Does that alter layout? No. But perhaps user expects background. Add? Since page likely has body default white, changing to cream gives editorial tone. Need maybe `background: #f4efe6;` or `background-color: #f4efe6`. Let's add to body rule. This is visual change. But maybe body has background from global elsewhere? This file is variant; adding body background is OK.
Could also set color-scheme? no.
Need maybe set `::selection`? Not in original. Don't add.

Need perhaps add `box-shadow` to `.cta-inner`? Not original. But target could. However cta-inner uses background and radius but no shadow.