.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 2);
    contain: layout style;
    margin-top: calc(var(--spacing-unit) * 4);
}

.background-card {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    background: var(--gray-900);
    transform: translateZ(0);
    transition: var(--transition);
    will-change: transform;
    cursor: pointer;
}

.background-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.background-preview {
    aspect-ratio: 16 / 9;
    overflow: hidden;
    position: relative;
}

.lazy-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.lazy-img.loaded {
    opacity: 1;
}

.img-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.background-info {
    padding: calc(var(--spacing-unit) * 2);
    background: var(--gray-900);
}

.background-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-200);
    margin-bottom: calc(var(--spacing-unit) / 2);
}

.background-meta {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.content-section p {
    margin-bottom: 1.5rem;
    color: var(--gray-300);
    line-height: 1.8;
}

.content-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--white);
}

.cta-inline {
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-800) 100%);
    border-radius: 12px;
    padding: calc(var(--spacing-unit) * 3);
    margin: calc(var(--spacing-unit) * 4) 0;
    text-align: center;
    border: 1px solid var(--gray-700);
}

.cta-inline p {
    color: var(--gray-200);
    margin-bottom: 1rem;
}

.principle-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
    margin-top: calc(var(--spacing-unit) * 4);
}

.principle {
    background: var(--gray-900);
    padding: calc(var(--spacing-unit) * 3);
    border-radius: 12px;
    border: 1px solid var(--gray-800);
}

.use-case-list {
    display: grid;
    gap: calc(var(--spacing-unit) * 4);
    margin-top: calc(var(--spacing-unit) * 4);
}

.use-case {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: calc(var(--spacing-unit) * 4);
    align-items: center;
}

.use-case:nth-child(even) {
    grid-template-columns: 300px 1fr;
}

.use-case:nth-child(even) .background-preview {
    order: -1;
}

@media (max-width: 768px) {
    .use-case,
    .use-case:nth-child(even) {
        grid-template-columns: 1fr;
    }
    
    .use-case:nth-child(even) .background-preview {
        order: 0;
    }
}

.spec-table {
    background: var(--gray-900);
    border-radius: 12px;
    overflow: hidden;
    margin-top: calc(var(--spacing-unit) * 4);
}

.spec-row {
    display: grid;
    grid-template-columns: 1fr 2fr;
    padding: calc(var(--spacing-unit) * 2);
    border-bottom: 1px solid var(--gray-800);
}

.spec-row:last-child {
    border-bottom: none;
}

.spec-label {
    font-weight: 600;
    color: var(--gray-300);
}

.spec-value {
    color: var(--gray-400);
}

.gallery-cta {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    border-radius: 16px;
    padding: calc(var(--spacing-unit) * 5);
    text-align: center;
    margin-top: calc(var(--spacing-unit) * 6);
    position: relative;
    overflow: hidden;
}

.gallery-cta::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.gallery-cta h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.gallery-cta p {
    color: var(--white);
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.gallery-cta .cta-button {
    background: var(--white);
    color: var(--accent);
    font-size: 1.125rem;
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 5);
    position: relative;
    z-index: 1;
}

.gallery-cta .cta-button:hover {
    background: var(--gray-100);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.guarantee {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.9);
    margin-top: 1rem;
    position: relative;
    z-index: 1;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: calc(var(--spacing-unit) * 3);
    margin-top: calc(var(--spacing-unit) * 4);
}

.related-card {
    background: var(--gray-900);
    border-radius: 12px;
    padding: calc(var(--spacing-unit) * 3);
    text-decoration: none;
    color: var(--white);
    transition: var(--transition);
    border: 1px solid var(--gray-800);
    display: block;
}

.related-card:hover {
    background: var(--gray-800);
    border-color: var(--gray-700);
    transform: translateY(-2px);
}

.related-card h4 {
    margin-bottom: calc(var(--spacing-unit));
    font-size: 1.125rem;
}

.related-card p {
    color: var(--gray-400);
    font-size: 0.875rem;
}

.faq {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: calc(var(--spacing-unit) * 3);
    padding-bottom: calc(var(--spacing-unit) * 3);
    border-bottom: 1px solid var(--gray-800);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit));
    color: var(--white);
}

.faq-answer {
    color: var(--gray-400);
    line-height: 1.8;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit));
    margin-bottom: calc(var(--spacing-unit) * 4);
    font-size: 0.875rem;
}

.breadcrumb a {
    color: var(--gray-400);
    text-decoration: none;
    transition: var(--transition);
}

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

.breadcrumb span {
    color: var(--gray-600);
}

.page-hero {
    padding: calc(var(--spacing-unit) * 15) 0 calc(var(--spacing-unit) * 10);
    background: radial-gradient(ellipse at top, var(--gray-900) 0%, var(--black) 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-hero h1 {
    font-size: clamp(2rem, 4vw, 3.5rem);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.page-hero .lead {
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.125rem;
    color: var(--gray-300);
}

.hero-backgrounds {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: calc(var(--spacing-unit) * 2);
    margin-top: calc(var(--spacing-unit) * 6);
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.hero-bg-sample {
    aspect-ratio: 16 / 9;
    border-radius: 8px;
    overflow: hidden;
    transform: translateZ(0);
    transition: var(--transition);
    opacity: 0.8;
}

.hero-bg-sample:hover {
    transform: scale(1.05);
    opacity: 1;
}

@media (max-width: 768px) {
    .hero-backgrounds {
        grid-template-columns: repeat(2, 1fr);
    }
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }
}

.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent);
    color: var(--white);
    padding: calc(var(--spacing-unit)) calc(var(--spacing-unit) * 2);
    text-decoration: none;
    border-radius: 0 0 8px 0;
    transition: top 0.3s;
}

.skip-to-content:focus {
    top: 0;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

.loading-skeleton {
    background: linear-gradient(90deg, var(--gray-800) 25%, var(--gray-700) 50%, var(--gray-800) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

@supports (backdrop-filter: blur(10px)) {
    header {
        background: rgba(0, 0, 0, 0.7);
    }
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--gray-900);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-700);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-600);
}

::selection {
    background: var(--accent);
    color: var(--white);
}

::-moz-selection {
    background: var(--accent);
    color: var(--white);
}