/* ═══════════════════════════════════════════════════════════════
   USE CASE PAGE TEMPLATE - Glass Box Architecture Style
   Inspired by qa-tools "From Black Box to Governance" visual system
   ═══════════════════════════════════════════════════════════════ */

:root {
    --uc-bg-dark: #0a0e17;
    --uc-bg-card: #0f1520;
    --uc-bg-code: #080c12;
    --uc-text-primary: #f1f5f9;
    --uc-text-secondary: #94a3b8;
    --uc-text-muted: #64748b;
    --uc-cyan: #22d3ee;
    --uc-magenta: #d946ef;
    --uc-purple: #8b5cf6;
    --uc-emerald: #10b981;
    --uc-amber: #f59e0b;
    --uc-grid-color: rgba(34, 211, 238, 0.04);
    --uc-border: rgba(255, 255, 255, 0.08);
}

* {
    box-sizing: border-box;
}

body.use-case-page {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--uc-bg-dark);
    color: var(--uc-text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Homepage header/footer styles (v3) */
.v3-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: 80px;
    background: rgba(2, 6, 23, 0.8);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.v3-navbar-inner {
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.v3-left {
    display: flex;
    align-items: center;
    gap: 28px;
}

.v3-right {
    display: flex;
    align-items: center;
    gap: 32px;
}

.v3-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--uc-text-primary);
}

.v3-logo {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.v3-logo-svg {
    width: 100%;
    height: 100%;
}

.v3-brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.v3-brand-name {
    font-size: 0.95rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #ffffff;
}

.v3-brand-sub {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(148, 163, 184, 0.9);
    margin-top: 4px;
}

.v3-nav-link {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    text-decoration: none;
    color: rgba(148, 163, 184, 0.95);
    transition: color 0.2s ease;
}

.v3-nav-link:hover {
    color: #ffffff;
}

.v3-footer {
    background: #ffffff;
    color: #0f172a;
    padding: 0 32px 64px;
}

.v3-footer-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.v3-footer-divider {
    width: 100%;
    height: 1px;
    background: #f1f5f9;
    margin-bottom: 96px;
}

.v3-footer-top {
    display: flex;
    flex-direction: column;
    gap: 48px;
    align-items: center;
    justify-content: space-between;
}

.v3-footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: center;
}

.v3-footer-mark {
    width: 32px;
    height: 32px;
    border-radius: 999px;
    background: #4f46e5;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 12px;
    font-weight: 800;
}

.v3-footer-title {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.v3-footer-subtitle {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(148, 163, 184, 0.95);
    margin-top: 6px;
}

.v3-footer-contact {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    text-align: center;
}

.v3-footer-kicker {
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: rgba(148, 163, 184, 0.95);
}

.v3-footer-email {
    font-size: 1.75rem;
    font-weight: 800;
    text-decoration: none;
    color: #0f172a;
}

.v3-footer-email:hover {
    color: #4f46e5;
}

.v3-footer-bottom {
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid #f8fafc;
    display: flex;
    flex-direction: column;
    gap: 18px;
    align-items: center;
    justify-content: space-between;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: rgba(148, 163, 184, 0.95);
    text-align: center;
}

.v3-footer-links {
    display: flex;
    gap: 40px;
}

.v3-footer-link {
    color: rgba(148, 163, 184, 0.95);
    text-decoration: none;
}

.v3-footer-link:hover {
    color: #4f46e5;
}

@media (min-width: 768px) {
    .v3-footer-top {
        flex-direction: row;
        align-items: center;
        text-align: left;
    }
    .v3-footer-brand {
        text-align: left;
    }
    .v3-footer-contact {
        align-items: flex-end;
        text-align: right;
    }
    .v3-footer-bottom {
        flex-direction: row;
        text-align: left;
    }
}

@media (max-width: 640px) {
    .v3-navbar-inner {
        padding: 0 18px;
    }
    .v3-left {
        gap: 18px;
    }
    .v3-right {
        gap: 18px;
    }
    .v3-footer {
        padding-left: 18px;
        padding-right: 18px;
    }
    .v3-footer-email {
        font-size: 1.5rem;
    }
}

/* Blueprint Grid Background */
.use-case-page::before {
    content: "";
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(var(--uc-grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--uc-grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
}

/* Navigation */
.uc-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 23, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--uc-border);
    padding: 16px 32px;
}

.uc-nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.uc-nav-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.uc-nav-right {
    display: flex;
    align-items: center;
    gap: 18px;
}

.uc-nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--uc-text-primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.uc-nav-brand svg {
    width: 28px;
    height: 28px;
    color: var(--uc-cyan);
}

.uc-brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.05;
}

.uc-brand-name {
    font-weight: 700;
    letter-spacing: -0.01em;
}

.uc-brand-sub {
    font-size: 0.7rem;
    letter-spacing: 0.18em;
    color: var(--uc-text-muted);
}

.uc-nav-link {
    color: var(--uc-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

.uc-nav-link:hover {
    color: var(--uc-cyan);
}

.uc-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--uc-text-muted);
}

.uc-breadcrumb a {
    color: var(--uc-text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.uc-breadcrumb a:hover {
    color: var(--uc-cyan);
}

.uc-breadcrumb-sep {
    color: var(--uc-text-muted);
}

/* Main Content */
.uc-main {
    position: relative;
    z-index: 1;
    max-width: 1000px;
    margin: 0 auto;
    padding: 32px 32px 100px;
}

/* Hero Section */
.uc-hero {
    margin-bottom: 64px;
}

.uc-hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--uc-cyan);
    margin-bottom: 20px;
}

.uc-hero-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(34, 211, 238, 0.15);
    border-radius: 8px;
    color: var(--uc-cyan);
}

.uc-hero-icon svg {
    width: 18px;
    height: 18px;
}

.uc-hero-title {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin: 0 0 8px 0;
    background: linear-gradient(135deg, var(--uc-text-primary) 0%, var(--uc-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.uc-hero-subtitle {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--uc-text-secondary);
    margin: 0 0 24px 0;
}

.uc-hero-desc {
    font-size: 1.1rem;
    color: var(--uc-text-secondary);
    max-width: 700px;
    line-height: 1.7;
}

/* Meta Section (Who it's for) */
.uc-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--uc-border);
}

.uc-meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.uc-meta-label {
    color: var(--uc-text-muted);
}

.uc-meta-value {
    color: var(--uc-text-primary);
    font-weight: 500;
}

.uc-tag {
    display: inline-block;
    padding: 4px 10px;
    background: rgba(34, 211, 238, 0.1);
    border: 1px solid rgba(34, 211, 238, 0.2);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--uc-cyan);
}

/* Section */
.uc-section {
    margin-bottom: 56px;
}

.uc-section-title {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--uc-text-primary);
    margin: 0 0 20px 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.uc-section-title::before {
    content: "";
    width: 4px;
    height: 24px;
    background: linear-gradient(180deg, var(--uc-cyan), var(--uc-magenta));
    border-radius: 2px;
}

.uc-section p {
    color: var(--uc-text-secondary);
    margin: 0 0 16px 0;
}

/* Feature List (What qa-tools does) */
.uc-features {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 16px;
}

.uc-features li {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 20px;
    background: var(--uc-bg-card);
    border: 1px solid var(--uc-border);
    border-radius: 12px;
    font-size: 0.95rem;
    color: var(--uc-text-secondary);
    transition: border-color 0.2s, background 0.2s;
}

.uc-features li:hover {
    border-color: rgba(34, 211, 238, 0.3);
    background: rgba(34, 211, 238, 0.03);
}

.uc-features li::before {
    content: "";
    flex-shrink: 0;
    width: 8px;
    height: 8px;
    margin-top: 7px;
    background: var(--uc-cyan);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--uc-cyan);
}

/* Visual / Diagram Card */
.uc-visual {
    background: var(--uc-bg-card);
    border: 1px solid var(--uc-border);
    border-radius: 16px;
    padding: 32px;
    margin: 24px 0;
    position: relative;
    overflow: hidden;
}

.uc-visual::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--uc-cyan), var(--uc-magenta));
}

.uc-visual-title {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--uc-text-muted);
    margin: 0 0 20px 0;
}

.uc-visual-content {
    display: flex;
    gap: 32px;
    align-items: center;
}

.uc-visual-img {
    max-width: 100%;
    border-radius: 8px;
}

/* Flow Diagram (Input -> Process -> Output) */
.uc-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    padding: 20px 0;
}

.uc-flow-box {
    padding: 20px 28px;
    border-radius: 12px;
    text-align: center;
    min-width: 160px;
}

.uc-flow-box.input {
    background: rgba(100, 116, 139, 0.15);
    border: 1px solid rgba(100, 116, 139, 0.3);
}

.uc-flow-box.process {
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.15), rgba(217, 70, 239, 0.15));
    border: 1px solid rgba(34, 211, 238, 0.3);
}

.uc-flow-box.output {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.uc-flow-box-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--uc-text-muted);
    margin-bottom: 8px;
}

.uc-flow-box-text {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--uc-text-primary);
}

.uc-flow-arrow {
    color: var(--uc-cyan);
    font-size: 1.5rem;
}

.uc-flow-arrow svg {
    width: 32px;
    height: 32px;
}

/* Code Block */
.uc-code-block {
    background: var(--uc-bg-code);
    border: 1px solid var(--uc-border);
    border-radius: 12px;
    overflow: hidden;
    margin: 24px 0;
}

.uc-code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--uc-border);
}

.uc-code-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--uc-text-secondary);
}

.uc-code-title svg {
    width: 16px;
    height: 16px;
    color: var(--uc-cyan);
}

.uc-code-lang {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 3px 8px;
    background: rgba(34, 211, 238, 0.1);
    border-radius: 4px;
    color: var(--uc-cyan);
    text-transform: uppercase;
}

.uc-code-content {
    padding: 20px;
    overflow-x: auto;
}

.uc-code-content pre {
    margin: 0;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--uc-text-secondary);
}

.uc-code-content .comment { color: var(--uc-text-muted); }
.uc-code-content .keyword { color: var(--uc-magenta); }
.uc-code-content .string { color: var(--uc-emerald); }
.uc-code-content .function { color: var(--uc-cyan); }
.uc-code-content .variable { color: var(--uc-amber); }

/* Artifacts Grid */
.uc-artifacts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.uc-artifact {
    padding: 20px;
    background: var(--uc-bg-card);
    border: 1px solid var(--uc-border);
    border-radius: 12px;
    text-align: center;
}

.uc-artifact-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(34, 211, 238, 0.1);
    border-radius: 10px;
    color: var(--uc-cyan);
}

.uc-artifact-icon svg {
    width: 24px;
    height: 24px;
}

.uc-artifact-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--uc-text-primary);
    margin-bottom: 4px;
}

.uc-artifact-desc {
    font-size: 0.8rem;
    color: var(--uc-text-muted);
}

/* CTA / Try It */
.uc-cta {
    background: linear-gradient(135deg, rgba(34, 211, 238, 0.1), rgba(217, 70, 239, 0.1));
    border: 1px solid rgba(34, 211, 238, 0.2);
    border-radius: 16px;
    padding: 32px;
    margin: 40px 0;
}

.uc-cta-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--uc-text-primary);
    margin: 0 0 12px 0;
}

.uc-cta-desc {
    color: var(--uc-text-secondary);
    margin: 0 0 20px 0;
}

.uc-cta-steps {
    list-style: none;
    padding: 0;
    margin: 0 0 24px 0;
    display: grid;
    gap: 8px;
}

.uc-cta-steps li {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9rem;
    color: var(--uc-text-secondary);
}

.uc-cta-steps li::before {
    content: counter(step);
    counter-increment: step;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--uc-cyan);
    color: var(--uc-bg-dark);
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 50%;
}

.uc-cta-steps {
    counter-reset: step;
}

.uc-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--uc-cyan);
    color: var(--uc-bg-dark);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
}

.uc-btn:hover {
    background: #06b6d4;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(34, 211, 238, 0.3);
}

.uc-btn svg {
    width: 18px;
    height: 18px;
}

.uc-btn-secondary {
    background: transparent;
    border: 1px solid var(--uc-border);
    color: var(--uc-text-primary);
}

.uc-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--uc-cyan);
    box-shadow: none;
}

/* Notes / Disclaimer */
.uc-notes {
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: 12px;
    padding: 20px 24px;
    margin: 32px 0;
}

.uc-notes-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--uc-amber);
    margin: 0 0 12px 0;
}

.uc-notes-title svg {
    width: 18px;
    height: 18px;
}

.uc-notes ul {
    margin: 0;
    padding-left: 20px;
    color: var(--uc-text-secondary);
    font-size: 0.9rem;
}

.uc-notes li {
    margin-bottom: 6px;
}

/* Footer */
.uc-footer {
    border-top: 1px solid var(--uc-border);
    padding: 32px;
    text-align: center;
}

.uc-footer-nav {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 20px;
}

.uc-footer-nav a {
    color: var(--uc-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.uc-footer-nav a:hover {
    color: var(--uc-cyan);
}

.uc-footer-copy {
    font-size: 0.8rem;
    color: var(--uc-text-muted);
}

/* Visuals Grid for Real Images */
.uc-visuals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin: 24px 0;
}

.uc-figure {
    margin: 0;
    background: var(--uc-bg-card);
    border: 1px solid var(--uc-border);
    border-radius: 12px;
    overflow: hidden;
}

.uc-figure img {
    width: 100%;
    height: 200px;
    object-fit: contain;
    display: block;
    background: #f1f5f9;
}

.uc-figure figcaption {
    padding: 12px 16px;
    font-size: 0.85rem;
    color: var(--uc-text-muted);
    text-align: center;
    border-top: 1px solid var(--uc-border);
}

/* Single large visual */
.uc-figure-full {
    grid-column: 1 / -1;
}

.uc-figure-full img {
    max-height: 500px;
    object-fit: contain;
    background: var(--uc-bg-code);
}

/* Placeholder for missing images */
.uc-placeholder-img {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: #64748b;
    font-size: 0.9rem;
    font-style: italic;
    text-align: center;
    padding: 20px;
}

/* Expansion Loop Diagram */
.uc-expansion-loop {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-width: 500px;
    margin: 0 auto;
}

.uc-loop-step {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px 20px;
    background: var(--uc-bg-card);
    border: 1px solid var(--uc-border);
    border-radius: 12px;
}

.uc-loop-num {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--uc-cyan);
    color: white;
    font-size: 0.85rem;
    font-weight: 700;
    border-radius: 50%;
    flex-shrink: 0;
}

.uc-loop-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.uc-loop-content strong {
    color: var(--uc-text-primary);
    font-size: 0.95rem;
}

.uc-loop-content span {
    color: var(--uc-text-muted);
    font-size: 0.85rem;
}

.uc-loop-arrow {
    text-align: center;
    color: var(--uc-cyan);
    font-size: 1.2rem;
    padding: 4px 0;
}

.uc-loop-repeat {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--uc-cyan);
    padding: 8px 0;
}

/* Horizontal Expansion Loop */
.uc-expansion-loop-h {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: nowrap;
    padding: 20px 0;
    overflow-x: auto;
}

.uc-loop-step-h {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 14px 16px;
    background: var(--uc-bg-card);
    border: 1px solid var(--uc-border);
    border-radius: 10px;
    min-width: 100px;
    text-align: center;
    flex-shrink: 0;
}

.uc-loop-step-h strong {
    font-size: 0.8rem;
    color: var(--uc-text-primary);
    white-space: nowrap;
}

.uc-loop-arrow-h {
    color: var(--uc-cyan);
    font-size: 1.5rem;
    font-weight: 300;
    flex-shrink: 0;
}

.uc-loop-repeat-h {
    font-size: 1.8rem;
    margin-left: 4px;
}

@media (max-width: 768px) {
    .uc-expansion-loop-h {
        flex-wrap: wrap;
        gap: 8px;
    }
    .uc-loop-step-h {
        min-width: 80px;
        padding: 10px 12px;
    }
}

/* ═══════════════════════════════════════════════════════════════
   LIGHT THEME VARIANT
   Add class="use-case-page light" to body for light mode
   ═══════════════════════════════════════════════════════════════ */

body.use-case-page.light {
    --uc-bg-dark: #f8fafc;
    --uc-bg-card: #ffffff;
    --uc-bg-code: #1e293b;
    --uc-text-primary: #0f172a;
    --uc-text-secondary: #475569;
    --uc-text-muted: #94a3b8;
    --uc-cyan: #0891b2;
    --uc-magenta: #a21caf;
    --uc-purple: #7c3aed;
    --uc-emerald: #059669;
    --uc-amber: #d97706;
    --uc-grid-color: rgba(8, 145, 178, 0.06);
    --uc-border: rgba(15, 23, 42, 0.08);
    background: var(--uc-bg-dark);
}

/* Light theme blueprint grid */
body.use-case-page.light::before {
    background-image:
        linear-gradient(var(--uc-grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--uc-grid-color) 1px, transparent 1px);
}

/* Light theme nav */
body.use-case-page.light .uc-nav {
    background: rgba(248, 250, 252, 0.9);
    border-bottom-color: rgba(15, 23, 42, 0.08);
}

/* Light theme hero title gradient */
body.use-case-page.light .uc-hero-title {
    background: linear-gradient(135deg, var(--uc-text-primary) 0%, var(--uc-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Light theme tags */
body.use-case-page.light .uc-tag {
    background: rgba(8, 145, 178, 0.08);
    border-color: rgba(8, 145, 178, 0.2);
}

/* Light theme features */
body.use-case-page.light .uc-features li {
    background: var(--uc-bg-card);
    border-color: var(--uc-border);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

body.use-case-page.light .uc-features li:hover {
    border-color: rgba(8, 145, 178, 0.3);
    background: rgba(8, 145, 178, 0.02);
}

/* Light theme visual card */
body.use-case-page.light .uc-visual {
    background: var(--uc-bg-card);
    border-color: var(--uc-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

/* Light theme flow boxes */
body.use-case-page.light .uc-flow-box.input {
    background: rgba(100, 116, 139, 0.08);
    border-color: rgba(100, 116, 139, 0.2);
}

body.use-case-page.light .uc-flow-box.process {
    background: linear-gradient(135deg, rgba(8, 145, 178, 0.1), rgba(162, 28, 175, 0.1));
    border-color: rgba(8, 145, 178, 0.25);
}

body.use-case-page.light .uc-flow-box.output {
    background: rgba(5, 150, 105, 0.1);
    border-color: rgba(5, 150, 105, 0.25);
}

/* Light theme code block - keep dark for contrast */
body.use-case-page.light .uc-code-block {
    background: var(--uc-bg-code);
    border-color: transparent;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

body.use-case-page.light .uc-code-header {
    background: rgba(255, 255, 255, 0.05);
    border-bottom-color: rgba(255, 255, 255, 0.08);
}

body.use-case-page.light .uc-code-title {
    color: #94a3b8;
}

body.use-case-page.light .uc-code-content pre {
    color: #e2e8f0;
}

body.use-case-page.light .uc-code-content .comment { color: #64748b; }
body.use-case-page.light .uc-code-content .keyword { color: #f472b6; }
body.use-case-page.light .uc-code-content .string { color: #4ade80; }
body.use-case-page.light .uc-code-content .function { color: #22d3ee; }
body.use-case-page.light .uc-code-content .variable { color: #fbbf24; }

/* Light theme artifacts */
body.use-case-page.light .uc-artifact {
    background: var(--uc-bg-card);
    border-color: var(--uc-border);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

body.use-case-page.light .uc-artifact-icon {
    background: rgba(8, 145, 178, 0.08);
}

/* Light theme CTA */
body.use-case-page.light .uc-cta {
    background: linear-gradient(135deg, rgba(8, 145, 178, 0.06), rgba(162, 28, 175, 0.06));
    border-color: rgba(8, 145, 178, 0.15);
}

body.use-case-page.light .uc-cta-steps li::before {
    background: var(--uc-cyan);
    color: #ffffff;
}

/* Light theme button */
body.use-case-page.light .uc-btn {
    background: var(--uc-cyan);
    color: #ffffff;
}

body.use-case-page.light .uc-btn:hover {
    background: #0e7490;
    box-shadow: 0 8px 24px rgba(8, 145, 178, 0.25);
}

body.use-case-page.light .uc-btn-secondary {
    background: transparent;
    border-color: var(--uc-border);
    color: var(--uc-text-primary);
}

body.use-case-page.light .uc-btn-secondary:hover {
    background: rgba(8, 145, 178, 0.05);
    border-color: var(--uc-cyan);
}

/* Light theme notes */
body.use-case-page.light .uc-notes {
    background: rgba(217, 119, 6, 0.06);
    border-color: rgba(217, 119, 6, 0.15);
}

/* Light theme footer */
body.use-case-page.light .uc-footer {
    border-top-color: var(--uc-border);
}

/* Responsive */
@media (max-width: 768px) {
    .uc-nav {
        padding: 12px 20px;
    }

    .uc-main {
        padding: 40px 20px 80px;
    }

    .uc-hero-title {
        font-size: 2rem;
    }

    .uc-hero-subtitle {
        font-size: 1.2rem;
    }

    .uc-flow {
        flex-direction: column;
    }

    .uc-flow-arrow {
        transform: rotate(90deg);
    }

    .uc-visual-content {
        flex-direction: column;
    }

    .uc-meta {
        flex-direction: column;
        gap: 12px;
    }
}

/* ═══════════════════════════════════════════════════════════════
   TWO-COLUMN CONTENT LAYOUT
   Reduces vertical whitespace by placing related sections side-by-side
   ═══════════════════════════════════════════════════════════════ */

.uc-two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px 40px;
    align-items: start;
    margin-bottom: 48px;
}

@media (max-width: 900px) {
    .uc-two-col {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

.uc-col {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.uc-col-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--uc-text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0 0 12px 0;
}

.uc-col-title .accent-bar {
    width: 5px;
    height: 28px;
    border-radius: 3px;
    flex-shrink: 0;
}

.uc-col-title .accent-bar.indigo { background: #6366f1; }
.uc-col-title .accent-bar.amber { background: #f59e0b; }
.uc-col-title .accent-bar.emerald { background: #10b981; }
.uc-col-title .accent-bar.cyan { background: var(--uc-cyan); }

.uc-col-text {
    color: var(--uc-text-secondary);
    line-height: 1.7;
}

.uc-col-text strong {
    color: var(--uc-text-primary);
    font-weight: 600;
}

/* ═══════════════════════════════════════════════════════════════
   CARD GRID - 2x2 Compact Lists
   ═══════════════════════════════════════════════════════════════ */

.uc-card-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

@media (max-width: 600px) {
    .uc-card-grid {
        grid-template-columns: 1fr;
    }
}

.uc-card-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--uc-bg-card);
    border: 1px solid var(--uc-border);
    border-radius: 12px;
    transition: all 0.2s ease;
}

.uc-card-item:hover {
    border-color: rgba(16, 185, 129, 0.3);
    background: rgba(16, 185, 129, 0.02);
}

.uc-card-item.alert:hover {
    border-color: rgba(245, 158, 11, 0.3);
    background: rgba(245, 158, 11, 0.02);
}

.uc-card-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    border: 1px solid;
}

.uc-card-icon.check {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
    color: #10b981;
}

.uc-card-icon.alert {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.2);
    color: #f59e0b;
}

.uc-card-icon svg {
    width: 18px;
    height: 18px;
}

.uc-card-item span {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--uc-text-primary);
}

/* ═══════════════════════════════════════════════════════════════
   RICH CARD LIST - Title + Description
   ═══════════════════════════════════════════════════════════════ */

.uc-rich-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.uc-rich-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 14px 16px;
    background: var(--uc-bg-card);
    border: 1px solid var(--uc-border);
    border-radius: 12px;
    transition: all 0.2s ease;
}

.uc-rich-item:hover {
    background: rgba(245, 158, 11, 0.02);
    border-color: rgba(245, 158, 11, 0.2);
}

.uc-rich-item.success:hover {
    background: rgba(16, 185, 129, 0.02);
    border-color: rgba(16, 185, 129, 0.2);
}

.uc-rich-icon {
    flex-shrink: 0;
    margin-top: 2px;
    color: #f59e0b;
}

.uc-rich-icon.success {
    color: #10b981;
}

.uc-rich-icon svg {
    width: 20px;
    height: 20px;
}

.uc-rich-content h4 {
    margin: 0 0 4px 0;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--uc-text-primary);
}

.uc-rich-content p {
    margin: 0;
    font-size: 0.8rem;
    color: var(--uc-text-muted);
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════════
   ACCENT CALLOUT BOX
   ═══════════════════════════════════════════════════════════════ */

.uc-callout {
    padding: 16px 20px;
    background: var(--uc-bg-card);
    border-left: 4px solid #6366f1;
    border-radius: 0 8px 8px 0;
}

.uc-callout p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--uc-text-secondary);
    line-height: 1.6;
}

.uc-callout strong {
    color: var(--uc-text-primary);
    font-weight: 600;
}

/* ═══════════════════════════════════════════════════════════════
   CONCLUSION FOOTER BLOCK
   ═══════════════════════════════════════════════════════════════ */

.uc-conclusion {
    position: relative;
    margin-top: 48px;
    padding: 32px;
    background: linear-gradient(135deg, #f1f5f9, #ffffff);
    border: 1px solid var(--uc-border);
    border-radius: 16px;
    text-align: center;
    overflow: hidden;
}

.uc-conclusion::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #6366f1, #a855f7, #ec4899);
}

.uc-conclusion p {
    position: relative;
    margin: 0;
    font-size: 1.1rem;
    color: var(--uc-text-secondary);
    line-height: 1.7;
    max-width: 700px;
    margin: 0 auto;
}

.uc-conclusion strong {
    color: var(--uc-text-primary);
    font-weight: 600;
}

/* ═══════════════════════════════════════════════════════════════
   PAGE NAVIGATION (Previous / Next)
   ═══════════════════════════════════════════════════════════════ */

.uc-page-nav {
    margin-top: 80px;
    padding: 0.75rem 2rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid #e2e8f0;
    position: sticky;
    top: 80px;
    z-index: 50;
}

.uc-page-nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

/* Breadcrumb on left */
.uc-page-nav-breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.uc-page-nav-breadcrumb span {
    color: #64748b;
}

.uc-page-nav-breadcrumb .uc-page-nav-title {
    font-weight: 600;
    color: #6366f1;
}

/* Navigation controls on right */
.uc-page-nav-controls {
    display: flex;
    align-items: center;
    border-left: 1px solid #e2e8f0;
    padding-left: 1rem;
    margin-left: 1rem;
}

.uc-page-nav-buttons {
    display: flex;
    align-items: center;
    background: #f1f5f9;
    border-radius: 8px;
    padding: 2px;
    border: 1px solid #e2e8f0;
}

.uc-page-nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: #64748b;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.15s;
}

.uc-page-nav-btn:hover:not(.disabled) {
    color: #0f172a;
    background: #ffffff;
}

.uc-page-nav-btn.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.uc-page-nav-btn svg {
    width: 14px;
    height: 14px;
    transition: transform 0.15s;
}

.uc-page-nav-btn:hover:not(.disabled) svg {
    transform: translateX(-1px);
}

.uc-page-nav-btn.uc-page-nav-next:hover:not(.disabled) svg {
    transform: translateX(1px);
}

.uc-page-nav-divider {
    width: 1px;
    height: 16px;
    background: #cbd5e1;
    margin: 0 0.25rem;
}

/* Dark theme page nav */
body.use-case-page:not(.light) .uc-page-nav {
    background: rgba(15, 23, 42, 0.95);
    border-bottom-color: var(--uc-border);
}

body.use-case-page:not(.light) .uc-page-nav-breadcrumb span {
    color: var(--uc-text-muted);
}

body.use-case-page:not(.light) .uc-page-nav-breadcrumb .uc-page-nav-title {
    color: #818cf8;
}

body.use-case-page:not(.light) .uc-page-nav-controls {
    border-left-color: var(--uc-border);
}

body.use-case-page:not(.light) .uc-page-nav-buttons {
    background: rgba(30, 41, 59, 0.8);
    border-color: var(--uc-border);
}

body.use-case-page:not(.light) .uc-page-nav-btn {
    color: var(--uc-text-secondary);
}

body.use-case-page:not(.light) .uc-page-nav-btn:hover:not(.disabled) {
    color: var(--uc-text-primary);
    background: rgba(51, 65, 85, 0.8);
}

body.use-case-page:not(.light) .uc-page-nav-divider {
    background: var(--uc-border);
}