/* ============================================================
   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 respond with rewritten CSS only. Need interpret. Original CSS single media query with three rules. Target style sidebar-classic, effect glow. Need preserve selectors and layout, font, etc. Can change visual properties. However these rules mostly layout-ish: text-align, font-size, padding. Padding can change within ±20%. We can adjust colors? There are no colors. Need maybe add visual properties allowed? Need ensure only visual identity changes, but original has no colors. Could still modify text-align? text-align is categorized under typography? It says text-align unchanged. font-size unchanged. Padding within ±20. So maybe this block has almost no room. But task says refresh visual identity. We can't change selectors. Could add box-shadow/border-radius/filter? But for these selectors (contact cards, hero section, badge) maybe adding glow shadows? Need not break layout. Padding can vary 20%. Let's compute original padding: var(--space-md). Need know? Could be roughly 1rem? Cannot know. We might keep same padding exactly to avoid. But "padding, margin (keep similar values, ±20% maximum)" so could change slightly.

Need maybe add color properties to elements? For .badge.bg-warning, bg-warning class implies Bootstrap warning color. We could set background-color, color, box-shadow glow. Since selecting .badge.bg-warning (with both), okay. For contact cards, set border, box-shadow, background, transition. For app-hero-section row col-lg-7 maybe text-align remains center. Could add color? Hmm.

Need ensure not changing layout. Adding box-shadow, background-color, border, border-radius, transition, filter are allowed. Could set backdrop-filter? But avoid.

Need preserve media query exactly.

Need output CSS. But note request "File: assets/css/saishi.css#块2/2" nly this chunk. CSS likely part of responsive. Need output with same selectors. Need "conservative". Applying target style sidebar-classic with darker sidebar etc not relevant to selectors. Need avoid altering padding beyond ±20. For --space-md unknown maybe Bootstrap spacer? `--space-md` likely defined elsewhere. We can replace with calc? If leave var unchanged, okay. Could perhaps use padding: var(--space-md) !important; unchanged. But then visually unchanged. To refresh, maybe add subtle glow to cards and badge. Also maybe adjust font-size? Cannot change font-size. For hero text-align center unchanged.

Need self-check: every selector preserved; display etc unchanged. We won't change display. Width etc none. Font-size unchanged if only mention? We must not change font-size. We won't.

Need maybe set `background-color` for badge warning? If bg-warning from Bootstrap remains, overriding could alter identity. Use new warning/accent color. What's accent? Since original no palette. We can choose indigo/cyan? Need "glow-effects" accent shadow. Let's pick functional accent maybe #7c6cf0 or #4ade80? Sidebar classic palette #252e3a and accent maybe #6ea8fe / #38bdf8. For a badge bg-warning, use warm amber maybe #f59e0b. But target style functional accent for actions. Use `#8b5cf6` violet? But bg-warning should be warning (amber). Could use `#fbbf24` with dark text #252e3a and glow `0 0 20px rgba(251,191,36,.35)`.

Need contact cards: maybe set border: 1px solid rgba(148,163,184,0.15); background: rgba(255,255,255,0.05); box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08), 0 0 0 1px rgba(255,255,255,0.04); border-radius: 16px; backdrop-filter: blur(8px); transition: box-shadow .3s ease, transform .3s ease? Transform is animation and layout? okay visual, but transform changes position; allowed? likely not layout? It is property not listed in forbidden except animation. Could add hover? But no hover selector. We cannot add :hover without changing selectors? Selector list cannot change. Need only existing selectors. No hover rules. Could use transition in base rule.

Contact-quick-section .contact-card can likewise.

Need app-hero-section .badge.bg-warning: maybe add background-image linear-gradient? But bg-warning already background-color. Use background: linear-gradient(135deg, ...). Need not set `background-color`? Could. Add color, border, box-shadow, border-radius. But `box-shadow` on inline badge? Fine.

Need hero col-lg-7: maybe add text-shadow? For text-align center. Could add color? But maybe should not override text color globally. We can add `color: #1e293b` maybe. But might affect inherited body color. Since .app-hero-section likely on dark hero? Hmm uncertain. Better only add if visual identity. We can use `text-shadow: 0 2px 16px rgba(37,46,58,.12);` on text. That is allowed and visual.

Need all selectors existing exactly. Need no markdown. But maybe output should include the original? Let's formulate.

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;
    }
}

Rewritten:
@media (max-width: 575.98px) {
    .app-hero-section .row .col-lg-7 {
        text-align: center;
        text-shadow: 0 2px 18px rgba(37, 46, 58, 0.18);
        color: #1f2937;  // maybe dangerous?
    }

    .app-hero-section .badge.bg-warning {
        font-size: 0.85rem;
        background: linear-gradient(135deg, #fbbf24, #f59e0b);
        color: #252e3a;
        border: 1px solid rgba(251, 191, 36, 0.6);
        border-radius: 999px;
        box-shadow: 0 0 20px rgba(251, 191, 36, 0.35), 0 4px 12px rgba(37, 46, 58, 0.12);
        backdrop-filter: blur(6px);
    }

    .contact-channels-section article,
    .contact-quick-section .contact-card {
        padding: var(--space-md) !important;
        background: linear-gradient(145deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
        border: 1px solid rgba(148, 163, 184, 0.16);
        border-radius: 16px;
        box-shadow: 0 10px 30px rgba(37, 46, 58, 0.08), 0 0 24px rgba(139, 92, 246, 0.08);
        transition: box-shadow 0.35s ease, background-color 0.35s ease;
    }
}

But we need be careful: adding background to `article` maybe has existing background? It's inside contact-channels. Could change card appearance. Maybe okay. But if it alters layout? background no. `border` adds 1px to box, with box-sizing likely border-box. But could affect because width includes border? CSS global maybe `box-sizing: border-box` unknown. To be safe could use `outline` rather than border? But outline doesn't affect layout. Yet border style allowed, border-width? It says border-width NEVER? Wait forbidden mentions border-width not in list? Actually sections: Color/border-color, border-style can change, but "border-width" not listed? Let's review. Original restrictions: 
- "All color values: background, color, border-color, fill, stroke, outline-color"
- "border-color and border-style (NOT border-width)"
Thus only border-color/style, not width. So adding border-width would violate? It says never change? More specifically "border-color and border-style (NOT border-width)" as allowed? Actually in "✅ MUST CHANGE" includes border-color and border-style. "🔒 NEVER CHANGE" doesn't list border-width. But if no border exists, adding border creates 1px; could change layout if borders shift. Better use `outline` with `outline-offset`? Outline doesn't affect layout, but outline-color/style allowed. We can use `outline: 1px solid rgba(...)`? But border-width? outline-width may be okay? They didn't specify. To avoid layout risk, use `outline: 1px solid rgba(...); outline-offset: -1px;` but that is visual. But maybe adding outline okay. But "outline styles (color, type)" are allowed. Yes. Maybe use `border: 0`? no. We can leave no border. Use `background-color` and `box-shadow` and border-radius no layout issue. `border-radius` no layout. `box-shadow` no layout. `backdrop-filter` no layout. `transition` no layout. text-shadow no layout.

Need maybe add `box-shadow: 0 0 0 1px rgba(...)` as ring without layout. Nice. Thus no border.

Need maybe set `--space-md` padding unchanged. Good.

Need also if adding a background to cards, ensure text remains visible? Adding linear-gradient light could make dark text less visible. Use transparent subtle. If cards already dark, `rgba(255,255,255,0.04)` adds white sheen. Good.

Need "accent" for glow: contact cards use indigo glow; badge amber; hero text shadow dark. Could be okay.

Need include no explanation.

But possible problem: The output must only CSS, no markdown. Need include leading `@media`.

Could maybe use `background: radial-gradient(...)` on article; `background` shorthand maybe includes image and color. Fine.

Need perhaps maintain `!important` on padding, because original had it. If add other properties no issue. But if we set `background` on same rule with `!important`? Maybe not.

Need think about "all colors replaced with fresh palette" — no colors existed. Use fresh.

Potential issue: In `.contact-channels-section article, .contact-quick-section .contact-card` selector list includes comma. Need preserve exactly, including line break? Selector exactly.

Potential issue: `@media (max-width: 575.98px)` is breakpoint condition, cannot change. Good.

Potential issue: font-size in badge cannot change. We preserve exactly. Text-align in hero preserve exactly. Padding preserve exactly.

Need maybe avoid `background` property because it could override existing background image from classes, but that's okay, visual refresh. But `.bg-warning` can be overridden by our background. Great.

Need maybe use `color` in hero? Not sure. Since text could be on a dark hero with white text; setting color #1f2937 would break. Could leave color out and use text-shadow only. But transform? no. Better not set `color` in hero to avoid contrast break. But then visual change minimal. We can set `text-shadow: 0 2px 20px rgba(37,46,58,.15)`. If text is white, dark shadow may be okay. If text dark, shadow not visible/harmless. Good.

Need maybe `badge` font-size "0.85rem"; don't change. Could add `display: inline-flex; align-items: center; gap: .25rem;` but display is forbidden. Don't.

Need maybe when badge is inline, `box-shadow` may get clipped by overflow? no.

Could add `letter-spacing`? forbidden. Don't.

Need perhaps `filter: drop-shadow`? Allowed. But box-shadow enough.

Need maybe use `transition: box-shadow .3s ease, filter .3s ease` on cards? If no hover, no effect. But if :hover elsewhere with box-shadow? might animate. The base rule only; transition allowed. But if contact card has global hover effect, transition will apply to changes from any hover from existing CSS. That could be good.

Need maybe add `animation`? Could modify existing animation? No selectors for keyframes. We can't add @keyframes? That would add new keyframes names? It says @keyframes names not changed, but additional? Probably not. Avoid.

Need maybe use `will-change: box-shadow`? not necessary.

Need "medium radius (8-16px)" use 14px or 16px. Good.

Need maybe use `box-shadow` layered:
- For cards: `0 12px 32px rgba(37, 46, 58, 0.12), 0 0 24px rgba(124, 108, 240, 0.10)`
- Hover halo no hover selector. Could still use `0 0 32px rgba(accent,.6)` on right? But no.

Maybe use `box-shadow: 0 0 24px rgba(139, 92, 246, 0.35), 0 8px 24px rgba(37, 46, 58, 0.1);` That gives glow. Good.

Need perhaps `.badge.bg-warning` style:
`background: linear-gradient(135deg, #fcd34d, #f59e0b);`
`color: #252e3a;`
`border-radius: 999px;`
`box-shadow: 0 0 24px rgba(245, 158, 11, 0.45), 0 4px 14px rgba(37, 46, 58, 0.18);`
This changes badge identity.

Need maybe `.contact-channels-section article` with article elements. Could include `border-radius: 16px; background: linear-gradient(145deg, rgba(248,250,252,0.04), rgba(148,163,184,0.02)); box-shadow: inset 0 1px 0 rgba(255,255,255,0.06), 0 0 24px rgba(139,92,246,0.06), 0 8px 24px rgba(37,46,58,0.08);` Good.

Need maybe `backdrop-filter: blur(10px);` allowed. But if there is no background behind, harmless. Could add to both card and badge. But backdrop-filter can create containing block? It can affect layout? `backdrop-filter` creates containing block for fixed? Could be okay. But to be conservative, maybe omit since could affect stacking/containing block. More safe to not.

Need maybe `filter: drop-shadow` no layout? filter creates stacking context but okay. But no need.

Need maybe `opacity` allowed; maybe set `opacity: 0.98`? No reason. Avoid.

Need final.

But we should think if changing `background` on `.contact-channels-section article` counts as layout? no.

Need output only CSS. Let's produce:

@media (max-width: 575.98px) {
    .app-hero-section .row .col-lg-7 {
        text-align: center;
        text-shadow: 0 2px 18px rgba(37, 46, 58, 0.16);
    }

    .app-hero-section .badge.bg-warning {
        font-size: 0.85rem;
        background: linear-gradient(135deg, #fcd34d, #f59e0b);
        color: #252e3a;
        border-radius: 999px;
        box-shadow: 0 0 24px rgba(245, 158, 11, 0.4), 0 4px 14px rgba(37, 46, 58, 0.18);
    }

    .contact-channels-section article,
    .contact-quick-section .contact-card {
        padding: var(--space-md) !important;
        background: linear-gradient(145deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.01));
        border-radius: 16px;
        box-shadow: 0 8px 24px rgba(37, 46, 58, 0.08), 0 0 24px rgba(124, 108, 240, 0.08);
        transition: box-shadow 0.35s ease, background 0.35s ease;
    }
}

Is `background` transition valid? It can animate? yes if same gradients? gradients may not interpolate? Better `background-color` transition but using gradient means no. Use `transition: box-shadow .35s ease, border-color .35s ease`? no border. Could transition `filter`? no. `transition: box-shadow 0.35s ease, background-color 0.35s ease;` Since `background` is gradient, `background-color` changes not triggered. okay.

Should we use `accent` color in card `box-shadow` with rgba(139, 92, 246, 0.08) but target accent maybe #8b5cf6. Use `rgba(139, 92, 246, 0.1)`. Good.

Need maybe include `outline` to have border look without affecting layout:
`outline: 1px solid rgba(148, 163, 184, 0.16); outline-offset: -1px;`
Would look like border. This is allowed. But if outline already set elsewhere maybe overridden. Could also use `box-shadow: inset 0 0 0 1px rgba(...)` as ring. This is part of box-shadow and no layout. I can use:
`box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 0 24px rgba(139, 92, 246, 0.08), 0 8px 24px