/* ============================================================
   SAISHI.CSS v3.0 - 赛事/文章/APP 页面专属样式
   ============================================================
   匹配 Section 模板:
   - ArticleSection (单文章详情)
   - AppHeroSection / AppQrSection / AppInstallSection / AppShowcaseSection
   - ContactChannelsSection / ContactFormSection / ContactQuickSection / ContactCommitmentsSection
   - LoginFormSection / SignupFormSection
   - SearchBoxSection (extends)
   - 滚动条 / 打印样式 / 图标
   ============================================================ */

/* ============================================
   1. Single Post (ArticleSection)
   ============================================ */
.single-post {
    overflow: hidden;
}

.single-post .post-meta {
    font-size: 0.9rem;
}

.single-post .post-meta i {
    color: var(--color-primary);
}

/* Post content typography */
.post-content {
    line-height: 1.8;
    font-size: 1.05rem;
    color: var(--color-text);
}

.post-content :is(h2, h3, h4) {
    margin-block: 2rem 1rem;
    font-weight: 700;
    color: var(--color-primary-darker);
    line-height: 1.4;
}

.post-content h2 {
    font-size: 1.75rem;
    padding-bottom: var(--space-xs);
    border-bottom: 2px solid var(--color-border);
}

.post-content h3 {
    font-size: 1.35rem;
}

.post-content :is(p, li) {
    margin-bottom: var(--space-sm);
}

.post-content blockquote {
    border-inline-start: 4px solid var(--color-primary);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-soft);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin-block: var(--space-md);
    color: var(--color-text-muted);
    font-style: italic;
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin-block: var(--space-sm);
    box-shadow: var(--shadow-sm);
}

.post-content a {
    color: var(--color-primary);
    text-decoration: underline;
    transition: color var(--transition-fast);
}

.post-content a:hover {
    color: var(--color-primary-dark);
}

.post-content ul,
.post-content ol {
    padding-inline-start: 1.5rem;
}

.post-content code {
    background: var(--color-bg-muted);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--color-danger);
}

.post-content pre {
    background: var(--color-primary-darker);
    color: #fff;
    padding: var(--space-md);
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin-block: var(--space-md);
}

.post-content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin-block: var(--space-md);
}

.post-content table th,
.post-content table td {
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--color-border);
    text-align: start;
}

.post-content table th {
    background: var(--color-bg-muted);
    font-weight: 600;
}

/* TOC */
.toc-box {
    border-inline-start: 3px solid var(--color-primary);
}

.toc-box ol {
    padding-inline-start: 1.2rem;
}

.toc-box ol li {
    margin: 0.4rem 0;
}

.toc-box ol li a {
    transition: all var(--transition-fast);
}

.toc-box ol li a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline !important;
    padding-inline-start: 4px;
}

/* Tags */
.post-tags .badge {
    background: var(--color-bg-muted) !important;
    color: #475569 !important;
    padding: 6px 12px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.post-tags .badge:hover {
    background: var(--color-primary) !important;
    color: #fff !important;
    transform: translateY(-1px);
}

/* Post nav */
.post-nav {
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.post-nav .btn {
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ============================================
   2. App Hero (AppHeroSection)
   ============================================ */
.app-hero-section {
    background: var(--gradient-hero);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.app-hero-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.2);
    z-index: 0;
}

.app-hero-section > .container {
    position: relative;
    z-index: 1;
}

.app-hero-section h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1.2;
}

.app-hero-section img {
    transition: transform var(--transition-slow);
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.3));
}

.app-hero-section img:hover {
    transform: translateY(-10px);
}

.text-white-50 {
    color: rgba(255, 255, 255, 0.65) !important;
}

/* ============================================
   3. App QR (AppQrSection)
   ============================================ */
.app-qr-section {
    background: var(--color-bg-soft);
}

.qr-card {
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.qr-card:hover {
    transform: scale(1.03);
    border-color: var(--color-accent);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.qr-card img {
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
}

/* ============================================
   4. App Install Steps (AppInstallSection)
   ============================================ */
.app-install-section {
    background: var(--color-bg-soft);
}

.app-install-section .badge.rounded-circle {
    width: 50px;
    height: 50px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
}

.app-install-section .bg-white {
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.app-install-section .bg-white:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.app-install-section .bg-white::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-icon);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--transition-base);
}

.app-install-section .bg-white:hover::before {
    transform: scaleY(1);
}

/* ============================================
   5. App Showcase (AppShowcaseSection)
   ============================================ */
.app-showcase-section {
    background: var(--color-bg);
}

.app-showcase-section img {
    transition: transform var(--transition-slow);
    filter: drop-shadow(0 15px 30px rgba(0, 0, 0, 0.15));
}

.app-showcase-section img:hover {
    transform: translateY(-5px) rotate(-1deg);
}

.app-showcase-section .bg-white {
    transition: all var(--transition-base);
    border-inline-start: 3px solid transparent;
}

.app-showcase-section .bg-white:hover {
    border-inline-start-color: var(--color-primary);
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

/* ============================================
   6. Contact Sections
   ============================================ */
.contact-channels-section {
    background: var(--color-bg);
}

.contact-channels-section article {
    transition: all var(--transition-base);
    border: 1px solid var(--color-border-soft);
}

.contact-channels-section article:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.contact-channels-section article ul li {
    transition: padding var(--transition-fast);
}

.contact-channels-section article ul li:hover {
    padding-inline-start: 4px;
}

/* Contact Quick */
.contact-quick-section {
    background: var(--color-bg-soft);
}

.contact-quick-section .contact-card {
    transition: all var(--transition-base);
}

.contact-quick-section .contact-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.contact-quick-section .contact-card i {
    transition: transform var(--transition-base);
}

.contact-quick-section .contact-card:hover i {
    transform: scale(1.1) rotate(-5deg);
}

/* Contact Form */
.contact-form-section {
    background: var(--color-bg-soft);
}

.contact-form-section .form-control,
.contact-form-section .form-select {
    border: 2px solid var(--color-border);
    transition: all var(--transition-fast);
}

.contact-form-section .form-control:focus,
.contact-form-section .form-select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 0.2rem rgba(59, 130, 246, 0.1);
}

.contact-form-section button[type="submit"] {
    transition: all var(--transition-base);
}

.contact-form-section button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary);
}

/* Contact Commitments */
.contact-commitments-section {
    background: var(--color-bg-soft);
}

.contact-commitments-section .bg-white {
    transition: all var(--transition-base);
    text-align: center;
}

.contact-commitments-section .bg-white:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.contact-commitments-section .bg-white i {
    transition: transform var(--transition-base);
}

.contact-commitments-section .bg-white:hover i {
    transform: scale(1.15);
}

/* ============================================
   7. Login / Signup Forms
   ============================================ */
main:has(> .container > .bg-white > form) .input-group-text {
    background-color: var(--color-bg-muted);
    border-color: var(--color-border);
    border-inline-end: none;
}

main:has(> .container > .bg-white > form) .input-group .form-control {
    border-inline-start: none;
}

main:has(> .container > .bg-white > form) .input-group:focus-within .input-group-text {
    border-color: var(--color-primary);
    background-color: #eff6ff;
}

main:has(> .container > .bg-white > form) .input-group:focus-within .form-control {
    border-color: var(--color-primary);
}

main:has(> .container > .bg-white > form) .form-check-input:checked {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

main:has(> .container > .bg-white > form) button[type="submit"] {
    transition: all var(--transition-base);
    font-weight: 600;
}

main:has(> .container > .bg-white > form) button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-primary);
}

/* ============================================
   8. Icons
   ============================================ */
.icon-img {
    max-width: 32px;
    max-height: 32px;
    object-fit: contain;
}

.icon-emoji {
    display: inline-block;
    line-height: 1;
}

/* ============================================
   9. Hero Buttons (đã có ở theme.css nhưng bổ sung thêm)
   ============================================ */
.hero-buttons .btn {
    transition: all var(--transition-base);
}

.hero-buttons .btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.hero-buttons .btn-warning {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: var(--color-primary-darker);
    font-weight: 600;
}

.hero-buttons .btn-warning:hover {
    background-color: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
}

.hero-buttons .btn-outline-light:hover {
    background-color: rgba(255, 255, 255, 0.15);
    color: #fff;
}

/* ============================================
   10. 自定义滚动条
   ============================================ */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-muted);
}

::-webkit-scrollbar-thumb {
    background: #94a3b8;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text
-muted);
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: #94a3b8 var(--color-bg-muted);
}

/* ============================================
   11. Print Styles
   ============================================ */
@media print {
    :is(.header,
        .footer,
        .sidebar-widgets,
        .social-share,
        #back-to-top,
        .breadcrumb-nav,
        .notice-bar,
        .cta-banner-section,
        .post-nav,
        .related-posts,
        .author-box,
        .pagination,
        .navbar-toggler,
        .nav-item) {
        display: none !important;
    }

    body {
        background: #fff !important;
        color: #000 !important;
        font-size: 12pt;
    }

    .single-post {
        box-shadow: none !important;
        border: none !important;
        padding: 0 !important;
        max-width: 100% !important;
    }

    .post-content {
        font-size: 11pt;
        line-height: 1.6;
    }

    a {
        text-decoration: underline;
        color: #000 !important;
    }

    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 9pt;
        color: #555;
    }

    a[href^="#"]::after,
    a[href^="javascript:"]::after,
    a[href^="mailto:"]::after,
    a[href^="tel:"]::after {
        content: "";
    }

    .post-content img {
        max-width: 100% !important;
        page-break-inside: avoid;
    }

    :is(h1, h2, h3, h4) {
        page-break-after: avoid;
        color: #000 !important;
    }

    p, li {
        orphans: 3;
        widows: 3;
    }
}

/* ============================================
   12. Animations bổ sung
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.animate-fade-in {
    animation: fadeInUp 0.6s ease-out;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

/* ============================================
   13. Responsive
   ============================================ */
@media (max-width: 991.98px) {
    .post-content {
        font-size: 1rem;
    }

    .post-content h2 {
        font-size: 1.5rem;
    }

    .post-content h3 {
        font-size: 1.2rem;
    }
}

@media (max-width: 767.98px) {
    .single-post {
        padding: var(--space-md) !important;
    }

    .post-content {
        font-size: 0.95rem;
    }

    .post-content h2 {
        font-size: 1.35rem;
    }

    .post-nav {
        flex-direction: column;
    }

    .post-nav .btn {
        width: 100%;
    }

    .post-tags .badge {
        font-size: 0.8rem;
        padding: 4px 8px;
    }

    .app-hero-section h1 {
        font-size: 1.75rem;
    }

    .app-install-section .badge.rounded-circle {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .toc-box {
        padding: var(--space-sm) !important;
    }

    .qr-card img {
        max-width: 140px !important;
    }
}

We need to rewrite the CSS in conservative mode: visual changes only. The original is a media query block with three rules. We can change color-related properties, shadows, border-radius, transitions, gradients, etc. Layout, typography, selectors must remain exactly. However, the original CSS has no colors or visual properties except font-size (which is typography and should not change), padding (margin/padding can change ±20% but here padding is a custom property var(--space-md) — we shouldn't change the custom property value? Actually custom properties are allowed to change only --color-* and --shadow-* values, but --space-md is not a color/shadow one, so we shouldn't change it. Also padding is layout, keep within 20% but we can't know value. The rule uses padding: var(--space-md) !important. We can leave.

We need to "refresh visually" without changing selectors or layout. Since there is no explicit color/shadows, we can add some visual properties? The instruction says "Only colors, shadows, and decorative properties may change" — we can add color properties? But not change layout. However, adding new declarations is allowed if it doesn't change layout. But "Keep ALL selectors and layout exactly as-is" — adding color, background, etc. is fine. But in conservative mode, we should produce a rewrite that is visually different. The original has a media query. We need to output CSS that preserves selectors and all existing declarations, but we can adjust visual properties. However, the original declarations include font-size and padding. Font-size is typography: cannot change. Padding: layout, cannot change beyond ±20% (but we don't want to change). So the only way to "refresh" is to add new visual declarations like background-color, border-radius, box-shadow, etc. But that could be artificial. Maybe the intent is to recolor / restyle based on target style: symmetric-grid, tight-rhythm. Since no colors exist, we can add a subtle visual identity, e.g., set border-radius on cards, add shadow, etc. But the selectors are specific: .contact-channels-section article, .contact-quick-section .contact-card. Adding border-radius, background, shadow is a visual change without breaking layout (unless box-shadow spread could overlay but not layout). We can also add colors to text? For .badge.bg-warning, bg-warning is a Bootstrap class; we can override background-color? But the selector is .app-hero-section .badge.bg-warning. In Bootstrap, bg-warning sets background-color: #ffc107. We could change it to a different color but that's visual. However, font-size is already there; we keep.

The target style: symmetric-grid (strict equal grids, uniform gap 24px, baseline aligned). But we can't change grid properties. The variant: tight-rhythm (compact spacing, small border-radius 2-6px, subtle shadows). The original is a media query for small screens. We can add border-radius: 4px, box-shadow subtle, maybe transition. But careful: adding border-radius to .contact-card could affect appearance but not layout. box-shadow doesn't affect layout. background-color could affect but no layout changes.

Let's craft a rewrite. We need to preserve all existing declarations exactly? "Keep ALL selectors and layout exactly as-is. Only change colors, shadows, radius, transitions, gradients." We shouldn't remove existing declarations. So we'll keep the media query and all three rules. For each rule, we can add visual properties. But "change" means we need to output the CSS with modifications. Since no visual properties exist, we can add them. Is that allowed? The task says "Refresh the visual identity WITHOUT changing layout structure or class names." Adding color/background/shadow is a visual identity refresh. It should be fine. But we must not change font-size or padding. So leave them.

We need to produce only CSS, no markdown. Let's compose.

Original:
@media (max-width: 575.98px) {
    .app-hero-section .row .col-lg-7 {
        text-align: center;
    }

    .app-hero-section .badge.bg-warning {
        font-size: 0.85rem;
    }

    .contact-channels-section article,
    .contact-quick-section .contact-card {
        padding: var(--space-md) !important;
    }
}

We can add:
- For .app-hero-section .badge.bg-warning: add background-color, color, border-radius, box-shadow? But it's a badge, small border-radius, tight rhythm. Use a fresh color palette maybe a harmonized teal/indigo. Since bg-warning is a utility class, we can override with a new background-color and color. But be careful: .badge.bg-warning likely has Bootstrap styles; overriding background-color in this media query will apply only at max-width 575.98px. That's acceptable. But the "target style" symmetric-grid may suggest a palette. We'll pick balanced harmonious palette: maybe a deep slate blue background? But the badge itself should stand out. Let's choose a warm amber? But we need to change visual identity. Perhaps use a consistent accent color across the new declarations.

- For contact cards: add background-color, border-radius, box-shadow, transition. But need to be subtle. Since padding uses var(--space-md), maybe card has a compact radius 4px, shadow subtle. Use a background color that contrasts with page? But the page background is unknown. We can use a light surface color like #fff or rgba(255,255,255,0.8). But if the original cards already have backgrounds, we might override. We can add a border? Wait, border-color can change but border-style can change, border-width not given. We can add border: 1px solid? That changes border-width from default style? Actually adding border affects layout potentially (box-sizing border-box? Unknown). But border likely inside padding, could affect dimensions but not layout structure? To be safe, avoid border width changes; we can use box-shadow for visual separation.

- For .app-hero-section .row .col-lg-7 (text-align center): we could add a color? text-align is layout, keep. We can add perhaps a text-shadow? That might improve hero text but we don't know. Adding text-shadow to the column could affect all text inside. We can add a subtle text-shadow? Better not.

We need to "change all color values" but there are none. So we can add fresh palette in the new properties. Let's be conservative and only add properties that are clearly visual and safe.

Let's draft:

@media (max-width: 575.98px) {
    .app-hero-section .row .col-lg-7 {
        text-align: center;
    }

    .app-hero-section .badge.bg-warning {
        font-size: 0.85rem;
        background-color: #f59e0b;
        color: #1e293b;
        border-radius: 4px;
        box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
    }

    .contact-channels-section article,
    .contact-quick-section .contact-card {
        padding: var(--space-md) !important;
        background-color: #ffffff;
        border-radius: 4px;
        box-shadow: 0 1px 3px rgba(16, 24, 40, 0.06), 0 1px 2px rgba(16, 24, 40, 0.04);
        transition: box-shadow 0.2s ease, background-color 0.2s ease;
    }
}

But adding background-color to .contact-channels-section article might override existing card backgrounds. It's a visual change. The target palette should be balanced. Let's pick a harmonious palette: maybe background #f8fafc for cards? But if the page background is white, cards need shadow. Use white. A soft slate shadow. The badge should use a symmetric-grid style? The target style mentions grid but not relevant.

We also can add a hover state? But pseudo-classes are allowed to keep, but the original doesn't have hover. We can add :hover? The instruction says "Pseudo-classes (:hover, :focus, ::before, ::after)" — "Selectors: keep exactly" means we should not add new selectors? It says "Every selector character-for-character preserved?" That implies we shouldn't add new selectors. Adding a :hover rule would be a new selector, not allowed. So don't add.

We can change transition on the existing selector by adding a transition property. That's not a selector. Good.

We need to ensure not to change padding. We kept it.

Potential issue: The original media query is max-width 575.98px. In this context, adding box-shadow and border-radius might be considered "decorative". Good.

But the "self-check" says "Colors throughout the file replaced with fresh palette?" There are no colors, so we introduced new ones. That's okay.

Could we change the custom property var(--space-md) to something else? No, --space-md is not a --color-* or --shadow-* variable, so we shouldn't touch. We can't change because it's a var reference. We could leave.

Also, the original has a badge with .bg-warning. If we override background-color, it changes the color. We should maybe use a different color than the Bootstrap default to refresh identity. Let's choose a violet/indigo accent to align with symmetric-grid? A balanced palette could be:
- Primary action: #4f46e5 (indigo)
- Surface: #ffffff
- Text on accent: #ffffff or dark slate.

But the badge is "warning" semantically, but our redesign can ignore semantics. Let's use a harmonious palette: #4f46e5 for badge? But warning is generally yellow/amber; changing to indigo may confuse. However, visual identity refresh allows changing colors. Let's perhaps use a muted teal: #14b8a6? But "warning" may be status. Target style doesn't specify semantics. We'll choose a modern palette: indigo as primary, amber as accent? Let's keep badge amber but a refined amber: #f59e0b. Add a subtle shadow. Cards white with slate shadows and small radius.

The variant "tight-rhythm" says small border-radius (2-6px), subtle shadows or none, info-dense feel. So 4px radius, 0 1px 2px rgba(0,0,0,0.05). Good.

But we also need to consider the first rule .app-hero-section .row .col-lg-7 text-align: center. We can add maybe a color or text-shadow? But that's a container, not necessary. To satisfy "change all color values" we could add a color to that column? It would inherit text color, but adding a color could affect all text color inside hero. Maybe that's a valid visual identity change. But is it safe? If the hero text was white on dark background, setting color to dark could break. We don't know. Better not add color to unknown container. We can leave that rule unchanged except maybe add a transition? Not needed.

Maybe we should only modify the other two rules. The first rule remains exactly as is. Is that acceptable? The task says "Refresh the visual identity" but if one rule has no visual properties, it's okay. But "You MUST change all color values" — there were none. We changed by adding to the rules that need it.

Let's think about the "symmetric-grid" target. It suggests equal grids. The media query contains .contact-channels-section article and .contact-quick-section .contact-card. These are likely cards in a grid. We can make them visually cohesive with background, radius, shadow. Good.

Let's consider if adding box-shadow to .contact-channels-section article and .contact-quick-section .contact-card might be too much. Could use a border? But border-width can't change; adding border sets width from default? If we set border: 1px solid, we're setting border-width, which is allowed? The NEVER CHANGE list says "border-style (NOT border-width)" — so border-width is allowed to change? Actually it says "border-color and border-style (NOT border-width)" under can change? Let's check the original constraints:

✅ YOU MUST CHANGE:
- All color values: background, color, border-color, fill, stroke, outline-color
- box-shadow
- text-shadow
- border-radius
- gradient colors and stops
- transition timing, easing, duration
- filter, backdrop-filter
- opacity
- outline styles (color, type)
- border-color and border-style (NOT border-width)
- caret-color, accent-color
- CSS custom properties (--color-*, --shadow-*) values

So border-width is not listed as allowed to change, so we shouldn't change it. Adding a border would introduce a border-width, which is a layout-affecting property? Actually adding border changes layout, so not allowed. Avoid border.

So no border. Use box-shadow.

Now, we need to write the output. We can include a comment? No comments.

Let's ensure no markdown fences. Output only CSS.

But the original includes a media query. We need to preserve the media query. We can add the new declarations inside.

Let's produce a polished version:

@media (max-width: 575.98px) {
    .app-hero-section .row .col-lg-7 {
        text-align: center;
    }

    .app-hero-section .badge.bg-warning {
        font-size: 0.85rem;
        background-color: #f59e0b;
        color: #1e293b;
        border-radius: 4px;
        box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
    }

    .contact-channels-section article,
    .contact-quick-section .contact-card {
        padding: var(--space-md) !important;
        background-color: #ffffff;
        border-radius: 4px;
        box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
        transition: box-shadow 0.2s ease, background-color 0.2s ease;
    }
}

Is adding transition allowed? Yes, "transition timing, easing, duration" can change; adding transition is a change. It's a decorative/interactive property, not layout. But if we add transition to a property that wasn't transitioning before, that's fine. It's a visual behavior.

But "transition timing, easing, duration" — maybe we should ensure transition property doesn't include "all" because that could affect layout? It's okay. We'll include a transition on box-shadow and background-color.

Now, check self-check:
- Selectors preserved exactly.
- display, position, etc. not touched.
- width/height/padding/margin: padding kept.
- font-size kept.
- Colors replaced/new.
- Shadows redesigned.
- Border-radius adjusted.
- No AI comments.

This seems compliant.

However, the user asked "File: assets/css/saishi.css#块2/2" and "Request ID" suggests there may be multiple blocks, but we just output this block. Good.

But perhaps we need to be more aggressive in refreshing visual identity using target style symmetric-grid. Symmetric-grid suggests uniform gaps and grid; but since we can't change layout, the only visual manifestation could be background patterns? The variant tight-rhythm suggests small radius and subtle shadows. We did that.

Could we also add a background gradient to the hero column? But that's risky and not tied to selector. We could add a color to the badge. Good.

Let's consider if we should change the `.contact-channels-section article` to have background-color: #f8fafc rather than white, for a more subtle look. But in tight-rhythm, cards often white with shadow. White is fine.

Maybe use a softer shadow: 0 1px 2px rgba(16, 24, 40, 0.05) only. But two-layer shadow is more designed.

Let's refine colors to a balanced palette: Use slate-blue tints:
- Badge: #0ea5e9 (sky) with dark text? But badge is "bg-warning", maybe not. Let's choose a refined amber #d97706? Actually a balanced harmonious palette could include:
  - Primary: #4f46e5 (indigo)
  - Accent: #f59e0b (amber)
  - Background surface: #ffffff
  - Shadow: rgba(15, 23, 42, 0.08)

But we have only one badge, use amber. The cards white. Good.

Maybe add a subtle gradient to card background? The instruction says "gradient colors and stops in linear/radial/conic-gradient" can change. We could add a linear-gradient on cards for a fresh look. But that's a visual change and within allowed. However, if cards already have background images, overriding to a solid color might be too much. But for a refresh, using a very subtle gradient could be nice. Example:
background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
This is a decorative background. Does it affect layout? No. It's allowed. But the instruction says "All color values: background, color, border-color..." — so background gradients are okay. Let's use a subtle gradient to add depth. In a tight-rhythm variant, maybe flat is better. But a slight gradient is subtle. Let's consider.

Original cards likely have no background defined in this media query; adding a gradient could clash with existing background from other styles. Since this is a media query, it overrides at small screens. If the original has no background, adding one is fine. But if the original card has a dark theme, we could break it. But the target style indicates light, fresh palette. The user asks to refresh visual identity, so changing to light might be desired even if original was dark? But "conservative" means avoid large changes? Still, color changes are allowed.

Let's stay safe with a nearly white background with subtle gradient. For tight-rhythm, maybe `background-color: #ffffff;` is enough.

Could we set a `box-shadow` with a colored tint? e.g., rgba(79, 70, 229, 0.08