/* ============================================================
   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 given CSS while following the rules. However, the original CSS snippet is quite small: only one media query with three rules. It contains only layout/text-align/padding etc., no colors/shadows/radius/transitions. The instructions say to keep selectors and layout exactly, and only change colors, shadows, radius, gradients, etc. But there are no such properties present. We need to output the rewritten CSS. But what can we change? Only visual properties. The rules use `text-align`, `font-size`, `padding`. Those are in the "never change" category? Let's check:

- `text-align` is listed in NEVER CHANGE (under layout/typography): text-align, vertical-align.
- `font-size` is NEVER CHANGE.
- `padding` is NEVER CHANGE but ±20% allowed. The padding here uses `var(--space-md)`. We could adjust the padding value? But it's a var reference, not a literal. Changing the var's value is allowed because CSS custom properties values can change. But the selector's padding property remains `var(--space-md)`. Actually we could change the padding to a different var or adjust the value? The rule says "Keep SIMILAR values, ±20% maximum". Since it uses a var, we could define a custom property – but the original CSS doesn't include a definition of `--space-md`. Maybe it's defined elsewhere. To be safe, we might keep the padding as is or change to a slightly different value? But we need to produce visual changes.

Maybe we need to add visual properties? The task says "Only change colors, shadows, radius, transitions, gradients." But if there are none, we might add new properties (that don't affect layout) to the existing rules? Adding properties to existing rules is allowed as long as we don't remove/change the layout properties. The instructions say "Refresh the visual identity WITHOUT changing layout structure or class names." So we can add e.g., `border-radius`, `box-shadow`, `transition` to existing selectors, modify background-color, etc. We can also add new declarations to rules. But we need to keep the existing declarations? Yes, but if we change a value, it must be within allowed. For `font-size: 0.85rem` – cannot change. For `text-align: center` – cannot change. For `padding: var(--space-md) !important` – could potentially adjust the var value? But that variable is defined elsewhere, not here. We could set a different padding value within 20%? Since it's a var, we don't know the value. The safest is to keep padding unchanged or adjust the var to a similar value? But we can't define the var here? Actually we could add a declaration `--space-md: 1.2rem;` but that would only apply within the media query? Hmm.

Let's consider: The file is "assets/css/saishi.css#块2/2". The original CSS is a fragment. The user wants a visual refresh. They likely expect us to preserve the given CSS structure exactly but enhance with visual properties (colors, shadows, etc.) according to the target style. Since the original CSS has no colors, we need to add visual styling? But the instructions say "only change colors, shadows, radius, transitions, gradients." It doesn't say "add new properties" explicitly, but the output should reflect the target style. Without changing layout, we can add background, box-shadow, border-radius, transition, etc. to the selectors. However, adding properties might be considered "changing" but visually only. The safe approach is to maintain every existing rule and selector, preserve all existing declarations exactly (except maybe padding if needed), and insert new declarations inside the rules that introduce the new visual identity.

But the target style "sidebar-classic" includes "glow-effects". These selectors are inside a media query for small screens. We can apply subtle glow, medium radius, etc. But these are hero section and contact cards. We could add `border-radius`, `box-shadow`, `transition` to the contact cards and articles. Also we can add `background-color` maybe? But adding background-color could affect layout? No, not layout. Adding `border-radius` to `.app-hero-section .badge.bg-warning` might be nice. Adding `box-shadow` to cards. But if we add box-shadow, it could be considered visual only.

However, the instruction says "📋 ORIGINAL CSS:" and then the code. They want "rewritten CSS". If we add new properties, the rewrite includes them. But we need to ensure we don't "change" existing layout values. The padding is `var(--space-md)` — that reflects a variable. We could potentially change the declaration to `padding: var(--space-md) !important;` — that's the same. But to incorporate the new visual style, we could adjust the variable? Not here. Alternatively, we could change the padding from `var(--space-md)` to a similar fixed value? But that would be changing a value in a way that could break if `--space-md` is different? Since it's in a media query and cards, we might keep the var. We are allowed to keep it as is.

Let's think what "refresh visual identity" means with such a small piece. Perhaps the expectation is to write a complete CSS that only contains the given selectors and media query, but with new visual properties. The "never change" list also includes "CSS custom properties values" are allowed to change but they aren't defined here. We cannot change what we cannot see. We shouldn't introduce `--space-md` definition because that may override globally.

Let's parse the original exactly:

```
@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 need to output a rewritten version. Within the media query, selectors and their existing declarations stay. We can add new declarations. For the first rule, we could add `border-radius`? For a column, probably not appropriate. Maybe add a subtle animation? But the target variant says "Subtle pulsing animations". We could add a pulse animation to the badge maybe? But the rule forbids changing animation-name, but we can add animation. Adding animation to the badge could be appropriate. The first rule is a container; adding a transition doesn't make sense. But we could add `background` temporarily? Hmm.

Maybe the safest is to only modify the third rule, which targets cards. We can add background, border-radius, box-shadow, transition. But the original CSS is a media query small phones. We can't change display, but we can add visual properties. Also for the badge, we can add a glow effect:

```
.app-hero-section .badge.bg-warning {
    font-size: 0.85rem;
    border-radius: 12px;
    box-shadow: 0 0 24px rgba(241, 196, 15, 0.4);
    background: linear-gradient(135deg, #f39c12, #f1c40f);
}
```

But wait, `.badge.bg-warning` already has Bootstrap background. Adding a gradient backgrounds might alter the look but visually. That's okay. However, adding `background` to a badge might be redundant but allowed. But we must not change font-size. We can add border-radius, box-shadow, transition.

For the cards:

```
.contact-channels-section article,
.contact-quick-section .contact-card {
    padding: var(--space-md) !important;
    border-radius: 16px;
    background: rgba(37, 46, 58, 0.03);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06), 0 0 24px rgba(37, 46, 58, 0.1);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}
```

But adding `transform` transition is fine; we don't change transform. We can also add a hover state? But we cannot add selectors? Actually we can add new selectors? The rule says "Selector lists (commas)" keep exact. But if we add a new selector like `.contact-channels-section article:hover`, that would be a new selector not in the original, but the instructions say "Keep ALL selectors and layout exactly as-is". It might be interpreted as we should not add or remove selectors. So we shouldn't add `:hover` styles. But we can modify existing pseudo-classes? None exist. So we cannot add hover rules. However, we can change `transition` property so that hover effects on existing elements (like Bootstrap's hover?) work. But the original CSS doesn't have hover selectors. We can add `transition` to the card, which is a visual property. But the actual hover styling might come from elsewhere in the stylesheet (e.g., Bootstrap). We could update the box-shadow in the main rule, but without a hover rule we cannot change on hover. But the transition will animate any existing hover state changes from other CSS.

We can also add `animation` to the badge using existing @keyframes? There's no @keyframes in the fragment. We could add an animation name, but the @keyframes would need to exist somewhere. We can't define new @keyframes? Actually we can, but the instruction says "@keyframes names (values inside CAN change)" and "animation-name (values like duration/timing CAN change)". We can add new keyframes? Probably not because we should preserve selectors and layout, but adding @keyframes might be considered adding new CSS. The output can contain @keyframes if needed? It's only the rewritten CSS. But to keep it simple, we can add a pulsing animation for the badge, but we need to define the keyframes. The original file might have them elsewhere; we can't rely. To be safe, we can use a transition and a subtle box-shadow.

But the "glow-effects" variant calls for "Subtle pulsing animations". We might add `animation: glowPulse 2s ease-in-out infinite;` and define `@keyframes glowPulse` in the output. That is an addition, but not changing existing selectors. However, adding @keyframes is allowed? The "Animation & Media" section says "Keep @keyframes names", but if no keyframes exist, adding new ones might violate "Keep ALL selectors and layout exactly as-is" because @keyframes are not selectors. Actually @keyframes is a separate at-rule. The instructions say "📺 ONLY the rewritten CSS, preserving ALL selectors and layout exactly". They likely expect preserving the original at-rules as well, but we can add new at-rules? To be conservative, maybe we should not add @keyframes. But the variant says "glow-effects" with "Subtle pulsing animations", which implies we may add animation. Since we cannot add selectors but can change values, we might use an existing animation if any. But we don't know.

Let's revisit the instruction: "Refresh this CSS visually. Keep ALL selectors and layout exactly as-is. Only change colors, shadows, radius, transitions, gradients." This is explicit: only change those property types, but we can also add them. The third rule has `padding` which is neither color/shadow/radius/transition/gradient, so we must keep it as is. The text-align and font-size must be kept. So our output should include the same declarations in the same order for each rule, plus possibly new declarations. But we cannot reorder? Reordering is allowed? It says "preserving ALL selectors and layout exactly". We should not reorder existing declarations? To be safe, keep existing declarations first, then add new ones. The new ones can be in any order.

Also, within media query, the selector list `.contact-channels-section article, .contact-quick-section .contact-card` is a selector list. Keep it exactly.

Now, the target palette: "Sidebar darker (#252e3a), main lighter". So we can use #252e3a as accent? Actually sidebar darker. But these are hero and contact sections, not sidebar. The accent color for glow could be #252e3a? Or a functional accent maybe a golden/amber since the badge uses `.bg-warning`. For the glow variant, accent color likely a vibrant accent. We can choose a blue/teal accent like #2D9CDB or the dark #252e3a? "Glow shadows in accent color: 0 0 24px rgba(accent, 0.4)". Let's pick a nice accent: maybe `#4A6CF7` (blue) or `#3B82F6`. But original badge is warning (yellow). We can create glow with rgba(37, 46, 58, 0.4) for dark sidebar accent? Maybe use `#5B8CFF` as functional accent.

We also need a "Halo on hover: 0 0 32px rgba(accent, 0.6)" but we cannot add hover selectors. But we can set a base shadow and transition. If the element has a hover state from another stylesheet that changes box-shadow, our transition would animate. But we can't set the hover box-shadow. Unless we add a `:hover` rule, but that would add a selector. The instruction says "Keep ALL selectors exactly" — does that mean we cannot add new selectors? The phrase "preserving ALL selectors and layout exactly" likely means do not modify existing selectors, but adding new ones might be technically "not preserving" the original set. However, to implement hover effects, we need a hover selector. Since we are in conservative mode, maybe we shouldn't add new selectors. We can incorporate the hover effect using a `transition` and a existing hover state from some base CSS. But if no hover state exists, we can't create it.

Alternatively, we can place the glow effect on the element itself and use a pulsing animation that toggles between two box-shadow states, no hover needed. That satisfies "Subtle pulsing animations" and uses glow shadows in accent color. We can add an `animation` property to the badge or cards, and define `@keyframes` or use an existing one. But adding an animation-name could be okay if the @keyframes exist? We don't know. We could use a built-in CSS animation like `pulse`? No standard. Better to define.

Let's inspect the instructions more carefully:

"🎬 ANIMATION & MEDIA:
  • @keyframes names (values inside CAN change)
  • @media query breakpoints (conditions only)
  • @import, @font-face, @supports, @charset
  • animation-name (values like duration/timing CAN change)"

This suggests that if there are @keyframes or animation-name, we can change them. But adding new @keyframes is not prohibited. The "Never change" list doesn't include adding keyframes. But the "Output" section says "ONLY the rewritten CSS, preserving ALL selectors and layout exactly". Adding @keyframes is not a selector. I think we can add @keyframes to support the pulsing effect. But we must consider if the user expects a "rewritten" version of the same CSS, not an extended one. The safest route: include the existing media query, add a new @keyframes after it, and reference it from the badge/cards. That yields a visually refreshed CSS.

However, the original CSS is a fragment "块2/2" (block 2/2). It's likely a partial file. Adding new @keyframes may be acceptable. But we should avoid changing the media query. The @keyframes can be at root level, outside media query. We can add them. We also need to ensure we don't change `font-size`, `text-align`, `padding`. The padding uses `var(--space-md)`; we can set `padding: var(--space-md)` with `!important`? Keep it.

Now, let's craft the output. We need to decide on exact values.

Choose accent color: `#38BDF8` (sky blue) for glow? Or `#FFB347` (warm accent) matching warning badge. Let's use a functional accent `#5E6CFA` (indigo) for modern look. But visual identity "sidebar-classic" might prefer a more classic green/blue. Let's use `#2D9CDB` (blue) for accent. It pairs well with white backgrounds and warning badges. The dark sidebar color `#252e3a` can be used in shadows as subtle.

Let's set:

- Badge: `border-radius: 10px;`, `box-shadow: 0 0 24px rgba(45, 156, 219, 0.35);`, `animation: badgeGlow 2.5s ease-in-out infinite;`. Also maybe `background: linear-gradient(135deg, #f6d365 0%, #fda085 100%);`? But `.bg-warning` is Bootstrap warning; if we set gradient, we override background color with gradient. That's visually fine. However, if Bootstrap's `.bg-warning` sets `background-color`, our `background` shorthand with gradient would override. That's okay. But we must be careful about specificity: `.badge.bg-warning` has two classes, same as original. The new property has higher specificity? No, same origin. Valid.

- Cards: add `border-radius: 16px;`, `background: rgba(37, 46, 58, 0.04);`, `box-shadow: 0 8px 24px rgba(37, 46, 58, 0.08), 0 0 24px rgba(45, 156, 219, 0.12);`, `transition: box-shadow 0.3s ease, transform 0.3s ease;`. Maybe `backdrop-filter: blur(4px);`? But it can affect visual only, okay. However, backdrop-filter could affect performance and rendering, but visual. Yet adding it might be unnecessary. Use subtle.

- Row/col: We can add `border-radius`? That may not make sense. Maybe add `transition` to column? No.

But the first rule `.