/* ============================================
   Museum Website - Lightweight CSS
   Based on museum-72.ru archived design
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Warm museum palette */
    --color-primary: #8B2635;
    --color-primary-dark: #6B1D2A;
    --color-secondary: #C9A962;
    --color-accent: #D4AF37;      
    --color-bg: #FEFCF8;
    --color-bg-alt: #F5F0E6;
    --color-bg-dark: #1A1A1A;
    
    --color-text: #2C2C2C;
    --color-text-light: #666666;
    --color-text-muted: #999999;
    --color-text-inverse: #FEFCF8;
    
    --color-border: #E8E0D0;
    --color-shadow: rgba(44, 44, 44, 0.1);
    
    /* Typography */
    --font-heading: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    
    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.5rem); }
h4 { font-size: 1.125rem; }

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.75rem 1.5rem;
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-text-inverse);
    box-shadow: 0 4px 15px rgba(139, 38, 53, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 38, 53, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn-outline {
    background: transparent;
    color: var(--color-text-inverse);
    border: 2px solid var(--color-text-inverse);
}

.btn-outline:hover {
    background: var(--color-text-inverse);
    color: var(--color-primary);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
}

/* ============================================
   HEADER
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-bg);
    box-shadow: 0 2px 20px var(--color-shadow);
}

.header-top {
    background: var(--color-bg-dark);
    padding: var(--space-sm) 0;
}

.header-top-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.phone {
    color: var(--color-text-inverse);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.phone:hover {
    color: var(--color-secondary);
}

.lang-switch {
    display: flex;
    gap: var(--space-sm);
}

.lang-switch a {
    color: var(--color-text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.lang-switch a.active,
.lang-switch a:hover {
    color: var(--color-text-inverse);
    background: var(--color-primary);
}

/* Navigation */
.main-nav {
    padding: var(--space-md) 0;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-xl);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-text-inverse);
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-text);
}

.logo-text small {
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--color-text-light);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-menu > li {
    position: relative;
}

.nav-menu > li > a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    padding: var(--space-sm) 0;
    position: relative;
}

.nav-menu > li > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width var(--transition-base);
}

.nav-menu > li > a:hover::after,
.nav-menu > li > a.active::after {
    width: 100%;
}

/* Dropdown */
.dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 200px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 40px var(--color-shadow);
    padding: var(--space-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
}

.has-dropdown:hover .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown li + li {
    margin-top: var(--space-sm);
}

.dropdown a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    color: var(--color-text-light);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.dropdown a:hover {
    background: var(--color-bg-alt);
    color: var(--color-primary);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-base);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 120px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        linear-gradient(135deg, rgba(139, 38, 53, 0.95), rgba(26, 26, 26, 0.9)),
        url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23C9A962' fill-opacity='0.08'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    z-index: -1;
}

.hero-content {
    text-align: center;
    color: var(--color-text-inverse);
    max-width: 800px;
    margin: 0 auto;
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-badge {
    display: inline-block;
    background: var(--color-secondary);
    color: var(--color-bg-dark);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero h1 {
    color: var(--color-text-inverse);
    margin-bottom: var(--space-lg);
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

.hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: var(--space-2xl);
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.5s both;
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text-inverse);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.7;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ============================================
   QUICK ACTIONS
   ============================================ */
.quick-actions {
    margin-top: -60px;
    position: relative;
    z-index: 10;
    padding-bottom: var(--space-3xl);
}

.actions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

.action-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-xl);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px var(--color-shadow);
    transition: all var(--transition-base);
}

.action-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 50px var(--color-shadow);
}

.action-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-inverse);
    font-size: 1.5rem;
}

.action-card span {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    text-align: center;
}

/* ============================================
   SECTIONS COMMON
   ============================================ */
section {
    padding: var(--space-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-header-light {
    color: var(--color-text-inverse);
}

.section-header-light h2 {
    color: var(--color-text-inverse);
}

.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.section-header-light .section-label {
    color: var(--color-secondary);
}

.section-header p {
    color: var(--color-text-light);
    font-size: 1.125rem;
    margin-top: var(--space-md);
}

.section-header-light p {
    color: rgba(255, 255, 255, 0.7);
}

.section-footer {
    text-align: center;
    margin-top: var(--space-2xl);
}

/* ============================================
   EXHIBITIONS
   ============================================ */
.exhibitions {
    background: var(--color-bg-alt);
}

.exhibitions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.exhibition-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.exhibition-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 50px var(--color-shadow);
}

.exhibition-card.featured {
    grid-column: span 2;
    grid-row: span 2;
}

.exhibition-image {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.exhibition-card.featured .exhibition-image {
    aspect-ratio: 16/9;
}

.exhibition-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, 
        hsl(var(--hue, 220), 40%, 30%), 
        hsl(var(--hue, 220), 50%, 50%));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    opacity: 0.9;
}

.exhibition-card.featured .exhibition-placeholder {
    font-size: 4rem;
}

.exhibition-badge {
    position: absolute;
    top: var(--space-md);
    left: var(--space-md);
    background: var(--color-primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
}

.exhibition-content {
    padding: var(--space-lg);
}

.exhibition-card.featured .exhibition-content {
    padding: var(--space-xl);
}

.exhibition-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.exhibition-meta span {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.exhibition-content h3 {
    margin-bottom: var(--space-sm);
    transition: color var(--transition-fast);
}

.exhibition-card:hover h3 {
    color: var(--color-primary);
}

.exhibition-content p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-md);
}

.age-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
}

/* ============================================
   MUSEUMS
   ============================================ */
.museums-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.museum-card {
    position: relative;
    height: 250px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    align-items: flex-end;
}

.museum-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 70%, black));
    transition: transform var(--transition-slow);
}

.museum-card:hover .museum-bg {
    transform: scale(1.05);
}

.museum-content {
    position: relative;
    z-index: 1;
    padding: var(--space-xl);
    color: var(--color-text-inverse);
    width: 100%;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
}

.museum-content i {
    font-size: 2rem;
    margin-bottom: var(--space-md);
    opacity: 0.8;
}

.museum-content h3 {
    color: var(--color-text-inverse);
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
}

.museum-link {
    font-size: 0.875rem;
    opacity: 0;
    transform: translateY(10px);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.museum-card:hover .museum-link {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   NEWS
   ============================================ */
.news {
    background: var(--color-bg-alt);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.news-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.news-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 50px var(--color-shadow);
}

.news-featured {
    grid-column: span 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.news-image {
    aspect-ratio: 16/10;
    overflow: hidden;
}

.news-featured .news-image {
    aspect-ratio: auto;
}

.news-placeholder {
    width: 100%;
    height: 100%;
    min-height: 200px;
    background: linear-gradient(135deg, 
        hsl(var(--hue, 220), 40%, 35%), 
        hsl(var(--hue, 220), 50%, 55%));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2.5rem;
    opacity: 0.9;
}

.news-content {
    padding: var(--space-lg);
}

.news-featured .news-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-xl);
}

.news-content time {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.news-content h3 {
    margin: var(--space-md) 0;
    transition: color var(--transition-fast);
}

.news-card:hover h3 {
    color: var(--color-primary);
}

.news-content p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary);
}

.news-link i {
    transition: transform var(--transition-fast);
}

.news-link:hover i {
    transform: translateX(5px);
}

/* ============================================
   VIDEO SECTION
   ============================================ */
.video-section {
    background: var(--color-bg-dark);
    color: var(--color-text-inverse);
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-lg);
}

.video-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    transition: transform var(--transition-base);
}

.video-card:hover {
    transform: translateY(-5px);
}

.video-placeholder {
    aspect-ratio: 16/9;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, 
        hsl(var(--hue, 220), 30%, 25%), 
        hsl(var(--hue, 220), 40%, 40%));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.video-placeholder i {
    font-size: 2rem;
    color: white;
    width: 60px;
    height: 60px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(5px);
    transition: all var(--transition-base);
}

.video-card:hover .video-placeholder i {
    background: var(--color-primary);
    transform: scale(1.1);
}

.video-card span {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    text-align: center;
}

/* ============================================
   PROJECTS
   ============================================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.project-card {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-xl);
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.project-card:hover {
    border-color: var(--color-primary);
    background: var(--color-bg-alt);
}

.project-card i {
    font-size: 2rem;
    color: var(--color-primary);
    flex-shrink: 0;
}

.project-card h4 {
    font-family: var(--font-body);
    font-weight: 500;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--color-bg-dark);
    color: var(--color-text-inverse);
    padding: var(--space-4xl) 0 var(--space-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-3xl);
}

.footer-brand .logo-icon {
    background: var(--color-primary);
}

.footer-brand .logo-text {
    color: var(--color-text-inverse);
}

.footer-brand .logo-text small {
    color: rgba(255, 255, 255, 0.6);
}

.footer-brand p {
    margin: var(--space-lg) 0;
    font-size: 0.875rem;
    opacity: 0.7;
}

.footer-social {
    display: flex;
    gap: var(--space-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
}

.footer-links h4,
.footer-contact h4 {
    color: var(--color-text-inverse);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-lg);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-links a {
    font-size: 0.875rem;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
}

.footer-contact .contact-phone {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: var(--space-lg);
}

.footer-contact .contact-phone:hover {
    color: var(--color-secondary);
}

.footer-contact .btn {
    display: block;
    margin-bottom: var(--space-sm);
    text-align: center;
}

.footer-bottom {
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.75rem;
    opacity: 0.6;
    margin-bottom: var(--space-xs);
}

.footer-bottom a {
    text-decoration: underline;
}

.footer-bottom a:hover {
    color: var(--color-secondary);
}

/* ============================================
   BACK TO TOP
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 50px;
    height: 50px;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: 0 5px 20px rgba(139, 38, 53, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .nav-menu {
        display: none;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .nav-actions .btn {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.75rem;
    }
    
    .exhibitions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .exhibition-card.featured {
        grid-column: span 2;
        grid-row: span 1;
    }
    
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1rem;
    }
    
    .actions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .exhibitions-grid,
    .museums-grid,
    .news-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .exhibition-card.featured,
    .news-featured {
        grid-column: span 1;
    }
    
    .news-featured {
        display: block;
    }
    
    .video-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn-lg {
        width: 100%;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

@media (max-width: 480px) {
    .actions-grid {
        grid-template-columns: 1fr;
    }
    
    .action-card {
        flex-direction: row;
        justify-content: flex-start;
        padding: var(--space-lg);
    }
    
    .action-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
}

/* Mobile menu animation */
.nav-menu.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    padding: var(--space-lg);
    box-shadow: 0 10px 40px var(--color-shadow);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}