:root {
    /* Color Palette - High Contrast Refinements */
    --color-primary: #0057B7;
    /* Ukrainian Blue */
    --color-primary-hover: #004494;
    --color-secondary: #FFDD00;
    /* Ukrainian Yellow */
    --color-text-main: #1F2937;
    /* Darker gray for better light mode contrast */
    --color-text-light: #4B5563;
    --color-bg-body: #F3F4F6;
    /* Slightly off-white */
    --color-bg-alt: #FFFFFF;
    --color-bg-header: rgba(255, 255, 255, 0.95);
    --color-border: #E5E7EB;

    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --container-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Effects */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 15px rgba(0, 87, 183, 0.2);

    --radius-md: 12px;
    --radius-lg: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

[data-theme="dark"] {
    --color-primary: #60A5FA;
    /* Lighter blue for dark mode contrast */
    --color-primary-hover: #93C5FD;
    --color-secondary: #FCD34D;
    --color-text-main: #F9FAFB;
    /* Almost white */
    --color-text-light: #D1D5DB;
    /* Light gray */
    --color-bg-body: #0F172A;
    /* Deep blue-gray slate */
    --color-bg-alt: #1E293B;
    /* Lighter slate */
    --color-bg-header: rgba(15, 23, 42, 0.95);
    --color-border: #334155;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: var(--font-body);
    color: var(--color-text-main);
    background-color: var(--color-bg-body);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--color-text-main);
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.25rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
    position: relative;
    display: inline-block;
    width: 100%;
}

/* Underline effect for H2 */
h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--color-secondary);
    margin: 0.5rem auto 0;
    border-radius: 2px;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

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

a:hover {
    color: var(--color-primary-hover);
}

ul {
    list-style: none;
}

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

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.section {
    padding: var(--spacing-xl) 0;
}

.bg-alt {
    background-color: var(--color-bg-alt);
}

/* Interactive Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #fff;
    /* Always white text on primary button */
    box-shadow: 0 4px 6px rgba(0, 87, 183, 0.3);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0));
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: -1;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    color: #fff;
    /* Keep text white */
    transform: translateY(-2px);
    box-shadow: 0 8px 12px rgba(0, 87, 183, 0.4);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:active {
    transform: translateY(0);
}

/* Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    background-color: var(--color-bg-header);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    transition: all var(--transition-normal);
}

.site-header.scrolled {
    height: 60px;
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--color-text-main);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo-img {
    height: 40px;
    transition: transform var(--transition-normal);
}

.logo:hover .logo-img {
    transform: rotate(10deg);
}

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

.lang-switcher {
    display: flex;
    gap: 0.5rem;
    background: var(--color-bg-body);
    padding: 0.25rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
}

.lang-switcher a {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-text-light);
    transition: all var(--transition-fast);
}

.lang-switcher a.active {
    background-color: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

.lang-switcher a:not(.active):hover {
    color: var(--color-text-main);
    background-color: rgba(0, 0, 0, 0.05);
    /* Subtle hover bg */
}

#theme-toggle {
    background: var(--color-bg-body);
    border: 1px solid var(--color-border);
    cursor: pointer;
    color: var(--color-text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    transition: all var(--transition-normal);
}

#theme-toggle:hover {
    transform: rotate(15deg);
    background: var(--color-bg-alt);
    box-shadow: var(--shadow-sm);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0.6;
    z-index: -1;
    transition: transform 10s ease-out;
    /* Parallax starter */
}

/* Reduce opacity more in dark mode so text pops */
[data-theme="dark"] .hero-bg {
    opacity: 0.2;
}

.hero-content {
    max-width: 900px;
    padding: var(--spacing-lg) var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 5rem);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-primary) 0%, #003366 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.1;
    /* In dark mode, gradient needs to be lighter */
}

[data-theme="dark"] .hero h1 {
    background: linear-gradient(135deg, #60A5FA 0%, #FFFFFF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero .subtitle {
    font-size: clamp(1.2rem, 3vw, 1.75rem);
    margin-bottom: var(--spacing-md);
    color: var(--color-text-main);
    /* Ensure clear contrast against bg */
    font-weight: 300;
}

.hero-details {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
    font-size: 1.1rem;
}

.hero-details p {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.5);
    /* Glass effect */
    border-radius: var(--radius-full);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .hero-details p {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Countdown */
.countdown {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.timer-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--color-bg-alt);
    padding: 1rem;
    border-radius: var(--radius-md);
    min-width: 100px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    transition: transform var(--transition-normal);
}

.timer-block:hover {
    transform: translateY(-5px);
}

.timer-block span:first-child {
    font-size: 2.5rem;
    font-weight: 700;
    font-family: var(--font-heading);
    color: var(--color-primary);
    line-height: 1;
}

.timer-block .label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-text-light);
    margin-top: 0.5rem;
}

/* Grids & Cards */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

@media (min-width: 768px) {
    .grid-2 {
        grid-template-columns: 1fr 1fr;
    }
}

.styled-list li {
    padding-left: 2rem;
    position: relative;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.styled-list li::before {
    content: "✓";
    color: var(--color-secondary);
    font-weight: 900;
    font-size: 1.25rem;
    position: absolute;
    left: 0;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    font-size: 0.8rem;
}

/* Organizers */
.organizers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.organizer-card {
    text-align: center;
    background: var(--color-bg-alt);
    padding: var(--spacing-lg) var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.organizer-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.organizer-card .img-wrapper {
    width: 180px;
    height: 180px;
    margin: 0 auto var(--spacing-md);
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--color-bg-body);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-bounce);
}

.organizer-card:hover .img-wrapper {
    transform: scale(1.05);
    border-color: var(--color-secondary);
}

.organizer-card h3 {
    margin-bottom: 0.5rem;
}

.organizer-card .role {
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 1rem;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
}

/* Map */
.map-container {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal);
}

.map-container:hover {
    transform: scale(1.01);
}

/* FAQ */
.faq-grid {
    display: grid;
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-bg-alt);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.faq-item h3 {
    margin-bottom: 0.5rem;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.faq-item h3::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--color-primary);
}

.faq-item p {
    color: var(--color-text-main);
    line-height: 1.6;
}

/* Simple JS expand/collapse could be added, but user asked for design. Let's keep it visible for SEO/simplicity or add details/summary logic if structure allows. For now ref design */

/* Forms */
.contact h2 {
    color: var(--color-primary);
}

.contact>.container>p {
    color: var(--color-text-main);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: var(--color-bg-body);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}

[data-theme="dark"] .contact-form {
    background: var(--color-bg-alt);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 2px solid var(--color-border);
    background: var(--color-bg-alt);
    color: var(--color-text-main);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
    background: var(--color-bg-body);
    color: var(--color-text-main);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-light);
}

/* Form status messages */
.form-status {
    text-align: center;
    padding: 1rem;
    margin-top: 1rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    display: none;
}

.form-status.success {
    display: block;
    background: rgba(16, 185, 129, 0.15);
    color: #10B981;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.form-status.error {
    display: block;
    background: rgba(239, 68, 68, 0.15);
    color: #EF4444;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* Footer */
.site-footer {
    background: var(--color-bg-alt);
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
    font-size: 0.9rem;
    color: var(--color-text-light);
}

/* Animations */
/* Base reveal class */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays */
.delay-100 {
    transition-delay: 0.1s;
}

.delay-200 {
    transition-delay: 0.2s;
}

.delay-300 {
    transition-delay: 0.3s;
}

/* Cookie Banner */
.cookie-banner {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    width: 90%;
    max-width: 600px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    opacity: 0;
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

[data-theme="dark"] .cookie-banner {
    background: rgba(31, 41, 59, 0.95);
}

.cookie-banner:not(.hidden) {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Share Buttons */
.share-buttons {
    margin-top: 2rem;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-bg-alt);
    color: var(--color-text-main);
    border: 1px solid var(--color-border);
    transition: all var(--transition-bounce);
    font-size: 0;
    /* Hide text, rely on icon or add icon logic later. For now just text centered. */
    font-size: 1.2rem;
}

.share-btn:hover {
    background: var(--color-primary);
    color: white;
    transform: scale(1.1) rotate(10deg);
}

/* Theme icon visibility */
[data-theme="light"] .icon-moon {
    display: none;
}

[data-theme="dark"] .icon-sun {
    display: none;
}

/* Inline icon in text */
.inline-icon {
    display: inline-block;
    width: 28px;
    height: 28px;
    vertical-align: middle;
    margin-right: 0.5rem;
}

/* Lead / Outro text */
.lead {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
    color: var(--color-text-light);
}

.outro {
    font-size: 1.05rem;
    margin-top: var(--spacing-md);
    color: var(--color-text-light);
    line-height: 1.8;
}

/* Check List (participation) */
.check-list li {
    padding-left: 2rem;
    position: relative;
    margin-bottom: 0.75rem;
    font-size: 1.05rem;
}

.check-list li::before {
    content: "✔";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

/* Exhibition details in About */
.exhibition-details {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--color-bg-alt);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

/* Organizer links */
.linkedin-link {
    display: inline-block;
    padding: 0.4rem 1.2rem;
    background: var(--color-primary);
    color: #fff !important;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition-normal);
}

.linkedin-link:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
}

.email-link {
    margin-top: 0.75rem;
    font-size: 0.9rem;
}

/* Placeholder box */
.placeholder-box {
    background: var(--color-bg-alt);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    overflow: hidden;
}

.placeholder-box img {
    max-width: 100%;
    height: auto;
}

/* Map overlay */
.map-overlay {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    background: var(--color-bg-alt);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: var(--shadow-lg);
}

.marker-icon {
    width: 32px;
    height: 32px;
}

.marker-text {
    display: flex;
    flex-direction: column;
}

.marker-text strong {
    font-size: 0.9rem;
}

.marker-text span {
    font-size: 0.75rem;
    color: var(--color-text-light);
}

/* Form labels */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text-main);
}

/* Form input text color */
.form-group input,
.form-group textarea {
    color: var(--color-text-main);
    font-size: 1rem;
}

/* Contact direct info */
.contact-direct {
    text-align: center;
    margin-top: var(--spacing-md);
    font-size: 1.1rem;
}

.contact-direct p {
    margin-bottom: 0.5rem;
}

/* Feature image */
.feature-img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* Mobile Adjustments */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-details {
        flex-direction: column;
        align-items: center;
    }

    .header-inner {
        padding: 0 1rem;
    }

    .countdown {
        gap: 0.5rem;
    }

    .timer-block {
        min-width: 60px;
        padding: 0.5rem;
    }

    .timer-block span:first-child {
        font-size: 1.5rem;
    }
}