/* ============================================================
   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;
    }
}

The user has provided a CSS file snippet and wants me to refresh it visually. Let me analyze what's in the file:

```css
@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;
    }
}
```

Wait, this is a very small file. The user says "File: assets/css/saishi.css#块2/2" (block 2/2) and the original CSS is quite minimal — just a media query with a few rules.

Let me check the constraints:
- 🎨 TARGET STYLE: dense-dashboard
- ✨ EFFECT VARIANT: sharp-edges
  - Hard offset shadows: 4px 4px 0px solid color
  - Small or zero border-radius (0-4px)
  - Strong borders (2-3px solid)
  - Snappy transitions (0.15s)

The task says: "Refresh this CSS visually. Keep ALL selectors and layout exactly as-is. Only change colors, shadows, radius, transitions, gradients."

But looking at the original CSS, there are no colors, shadows, radius, transitions, or gradients to change. The original CSS only contains:
1. `.app-hero-section .row .col-lg-7 { text-align: center; }` — text-align is a layout property, can't change
2. `.app-hero-section .badge.bg-warning { font-size: 0.85rem; }` — font-size, can't change
3. `.contact-channels-section article, .contact-quick-section .contact-card { padding: var(--space-md) !important; }` — padding, can change within ±20%

Since the layout properties must be preserved, and there are no visual properties (colors, shadows, etc.) in this snippet, what can I actually change?

Let me re-read the rules:

✅ MUST CHANGE (visual identity only):
  • 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
  • border-color and border-style (NOT border-width)
  • caret-color, accent-color
  • CSS custom properties (--color-*, --shadow-*) values

🔒 NEVER CHANGE:
  • Selectors
  • Layout properties (display, position, grid, flex, width, height, padding, margin, gap, etc.)
  • Typography (font-family, font-size, font-weight, line-height, etc.)
  • text-align (explicitly listed under layout: text-align, vertical-align)

So in this snippet:
- `text-align: center` — must NOT change
- `font-size: 0.85rem` — must NOT change
- `padding: var(--space-md) !important` — padding must be kept within ±20%. The value is `var(--space-md)`, which is a custom property reference. I cannot change the property itself. I could potentially change `--space-md` value but that's defined elsewhere (in a root block, not in this snippet). Changing it here would be risky since it's a variable reference.

Hmm, this is a tricky situation. The original CSS doesn't contain any of the visual properties I'm supposed to change. The instructions say "Previous attempt didn't change enough. Make colors, shadows, and radius MORE distinct this round. Use a fresh palette."

But there are literally no colors, shadows, or radius values in this snippet. What can I do?

Options:
1. Add new visual properties without changing layout: For example, I could add `background-color`, `box-shadow`, `border-radius`, `transition` properties to these selectors. But wait — the instructions say "ONLY the rewritten CSS, preserving ALL selectors and layout exactly." Adding new properties would technically not break the layout, but it would change the visual identity. Is that allowed?

The task says: "Refresh the visual identity WITHOUT changing layout structure or class names." and "The HTML is FIXED — only colors, shadows, and decorative properties may change."

So yes, I think adding decorative properties is in scope. The original CSS is minimal, but the point of the exercise is to make the visual identity more distinct. Since the snippet contains no visual properties, I should add them.

But wait — is it safe to add properties to these selectors? Let me think about what these selectors target:

1. `.app-hero-section .row .col-lg-7` — a column in a hero section. Adding a background or shadow here could change the visual design significantly. But the target style is "dense-dashboard" with "sharp-edges". Hmm, adding a background to a col-lg-7 might be weird, but it could work as a panel.

2. `.app-hero-section .badge.bg-warning` — a badge. The class `bg-warning` is likely a Bootstrap utility class that sets background-color: #ffc107 (yellow). Adding border-radius, box-shadow could make it more distinct.

3. `.contact-channels-section article, .contact-quick-section .contact-card` — cards. These are perfect candidates for shadows, border-radius, transitions.

Given the "dense-dashboard" target style:
- Cool grays #1e293b, #334155, accent blue #3b82f6
- White cards on slate background

And "sharp-edges" variant:
- Hard offset shadows: 4px 4px 0px solid color
- Small or zero border-radius (0-4px)
- Strong borders (2-3px solid)
- Snappy transitions (0.15s)

Since the original CSS only has a media query for max-width 575.98px, these are mobile/phone styles. I should keep the media query as the wrapper.

Let me be careful:
- The media query condition `(max-width: 575.98px)` must stay.
- The selector lists must stay exactly.
- The layout properties (text-align, font-size, padding) must stay.

I'll add visual properties that enhance the sharp-edges dashboard look:

For `.app-hero-section .row .col-lg-7`:
- This is a text column. Adding a background might be too much. But I could add a subtle border-left or box-shadow. Actually to stay safe, maybe I should avoid adding backgrounds to columns that might contain text directly. But the instruction says "Make colors, shadows, and radius MORE distinct this round." So I should make bold choices.

Actually, let me reconsider. The instruction says: "Previous attempt didn't change enough. Make colors, shadows, and radius MORE distinct this round. Use a fresh palette."

For the col-lg-7, I could add:
- background-color: #ffffff (white card)
- border-radius: 4px
- box-shadow: 4px 4px 0px #1e293b (hard offset shadow)
- border: 2px solid #334155 (strong border)
- transition: all 0.15s ease

But wait — adding a border will change layout (box-sizing could be border-box or content-box). This is risky. The instructions say "border-color and border-style (NOT border-width)". So I cannot add border-width. I cannot add `border: 2px solid` because that sets border-width. I can only set border-color and border-style if border-width is already present. But in this snippet, there's no border-width. Adding a border would change widths and could break layout.

So I must NOT add border-width. However, I could add `box-shadow` which doesn't affect layout. `box-shadow` is safe. `background-color` is safe. `border-radius` is safe. `transition` is safe.

But `box-shadow: 4px 4px 0px solid color` — hmm, box-shadow doesn't use "solid" — it's just `4px 4px 0px color`. The "solid color" in the target is a design concept: hard offset shadows using solid colors (like neo-brutalism). So `box-shadow: 4px 4px 0px #1e293b`.

Still, adding `background-color` to a col might alter the look significantly. But since the target palette is "White cards on slate background", a white background on the hero column might be fine.

Let me think about what's appropriate:

1. `.app-hero-section .row .col-lg-7` — On mobile, the hero text column becomes centered. Making it a "card" with white bg, hard shadow, small radius would fit the dashboard aesthetic. But it contains text, so a white background is fine.

Actually, hold on. If this column is part of a `.row` with padding from Bootstrap, adding a background color will change how it looks but not the layout (background doesn't affect layout). `border-radius` with a background would clip nothing but round the corners. Adding padding is restricted — but I shouldn't add padding anyway.

2. `.app-hero-section .badge.bg-warning` — A badge with `bg-warning` class. This is a yellow badge. I can't change `background` because it comes from the Bootstrap `.bg-warning` class, which isn't in this file. But I can override it here by adding `background-color` with a different value. Wait — can I change `background-color`? Yes, "All color values: background, color, border-color..." are things I must change. So I should add a `background-color` to override the warning yellow. But the class name is `bg-warning` — semantically it should be a warning color. Hmm. But for a "fresh palette" of cool grays and blue, maybe I can use a stronger amber/orange that fits the palette? Or the target palette says "Cool grays #1e293b, #334155, accent blue #3b82f6, White cards on slate background." There's no explicit warning color. But making a warning badge blue would be semantically odd. Maybe I can keep it warm but tweak the hue to a brighter, more saturated amber. Or use a fresh palette accent like #3b82f6 for the badge text? Actually a badge with a solid blue background and white text could work in a dashboard aesthetic.

Let me think about "dense-dashboard": dashboards often have badges with accent colors. A warning badge might stay yellow but I can add a hard shadow and small radius to make it pop.

3. `.contact-channels-section article, .contact-quick-section .contact-card` — Cards. Perfect for white background, hard shadows, small radius, transitions.

Constraints recap:
- Cannot change `padding: var(--space-md) !important` — actually I CAN change it within ±20%. `var(--space-md)` is a reference to a custom property. If I change it to `var(--space-sm)` that could be a different value, but that changes the variable reference — is that allowed? The rule says "CSS custom properties (--color-*, --shadow-*) values" may change, but `--space-md` is a spacing custom property, not color/shadow. Changing padding is allowed ±20%. But `var(--space-md)` — I don't know its value. Changing to a literal pixel value would be risky. Better to keep it as-is to be safe. Actually the constraint says "padding, margin (keep similar values, ±20% maximum)". Keeping `var(--space-md)` exactly is safest. It's already within ±20% (identical). So keep it.

- Cannot change `font-size: 0.85rem` — keep.
- Cannot change `text-align: center` — keep.

So the approach: Keep the three existing declarations exactly, add new visual declarations to each selector within the media query.

Let me draft:

```css
@media (max-width: 575.98px) {
    .app-hero-section .row .col-lg-7 {
        text-align: center;
        background-color: #ffffff;
        border-radius: 4px;
        box-shadow: 4px 4px 0px #1e293b;
    }

    .app-hero-section .badge.bg-warning {
        font-size: 0.85rem;
        background-color: #3b82f6;
        color: #ffffff;
        border-radius: 2px;
        box-shadow: 2px 2px 0px #1e293b;
    }

    .contact-channels-section article,
    .contact-quick-section .contact-card {
        padding: var(--space-md) !important;
        background-color: #ffffff;
        border-radius: 4px;
        box-shadow: 4px 4px 0px #334155;
        transition: all 0.15s ease;
    }
}
```

Wait, for the badge: if I set `background-color: #3b82f6` (blue) on a `.bg-warning` badge, that's a big visual change. But is it wise? The class says `bg-warning` and Bootstrap's `.bg-warning` would apply `background-color: #ffc107 !important`? Actually in Bootstrap 5, `.bg-warning` is `background-color: #ffc107 !important`. If Bootstrap's rule has `!important`, my override here without `!important` would lose. But I don't know the Bootstrap version. To be safe, I could use `background-color: #3b82f6 !important`. But adding `!important` changes the declaration's importance — is that allowed? It doesn't affect layout. It's a visual property. I think it's allowed. But the instruction says "NEVER CHANGE ... border-color and border-style (NOT border-width)". It doesn't mention `!important` usage.

Actually, to be safe and avoid specificity wars, I could keep the badge's warning color but make it a fresh warning color like `#f59e0b` (amber-500) with a dark slate shadow. But the target palette specifically says "Cool grays #1e293b, #334155, accent blue #3b82f6, White cards on slate background." Maybe a full blue badge to introduce the accent. Since this is about refreshing the visual identity and "fresh palette", I'll go with a blue badge — it's a bold change.

Hmm, but `.bg-warning` implies semantic warning. Changing it to blue might confuse. However, the instruction says: "Previous attempt didn't change enough. Make colors, shadows, and radius MORE distinct this round." So bold is desired.

Let me also consider adding `transition` to the col and badge for snappy feels. The target says transitions 0.15s.

Also for the hero column, should I add a transition? It might not need one. But for the cards, definitely.

Let me reconsider the `col-lg-7` change. Adding a white background to a column might make text unreadable if it was on a dark hero background. But the target palette says "White cards on slate background", so white with dark text is fine. However, I'm not changing text color — text color comes from elsewhere. If the original hero text is white (on a dark background), and I paint the column white, the white text becomes invisible. That's a real risk.

Hmm. If I add `background-color: #ffffff` to the column but the text inside is white (because Bootstrap hero or a custom class), it would break readability. But the instruction says I can change `color` values. I could add `color: #1e293b` to the column to ensure dark text. But `color` is inherited and might affect links, badges, etc. Actually setting `color` on the column is safe — it sets the text color for that column. If the original text was dark, no issue; if white, this fixes it. But what about other elements inside? Links have their own colors. This is a reasonable safeguard.

But wait — the rule says "color" is a value I MUST change. But there's no existing `color` to change. Adding color is adding a new property. The task says "only colors, shadows, and decorative properties may change." Adding is fine.

But there's also the risk: what if the column is not supposed to be a card? Adding a box-shadow and background could look odd. But the exercise explicitly wants a visual refresh with hard offset shadows and cards. I'll go with it, but perhaps make the hero column's shadow lighter or use a border-radius of 0 for the sharp-edges look? The sharp-edges variant says "Small or zero border-radius (0-4px)". I'll use 4px for cards and 0 or 2px for badge.

Actually, let me reconsider the target style name "dense-dashboard" with "sharp-edges". The dashboard style typically has white cards, slate background, accent blue. For a mobile hero column, maybe a subtle slate background instead of white? Like `background-color: #f8fafc` (slate-50)? But the palette says "White cards on slate background." White is fine.

Let me also think: should I add a `border` property? The sharp-edges variant says "Strong borders (2-3px solid)". But the NEVER CHANGE list says "border-color and border-style (NOT border-width)". This is ambiguous: it says I can change border-color and border-style, but NOT border-width. It doesn't say I can't add a border-width. But adding a border-width would change layout (box sizing). Unless `box-sizing: border-box` is set globally. Since I don't know, safest is to NOT add border-width. I can simulate strong borders with box-shadow by adding an inset shadow or multiple shadows: `box-shadow: 4px 4px 0px #1e293b, inset 0 0 0 2px #334155`. Wait, `inset 0 0 0 2px` simulates a 2px border without affecting layout. That's a nice trick! I can use inset box-shadow to create a "border" look without actually setting border-width. That perfectly aligns with "border-color and border-style" changes while avoiding layout shift.

So for cards:
```css
box-shadow: 4px 4px 0px #334155, inset 0 0 0 2px