:root {
            --light-bg: #FFFFFF;
            --section-bg: #F8F9FA;
            --primary-blue: #00BFFF;
            --light-blue: #2386fd;
            --border-color: rgba(0, 0, 0, 0.1);
            --text-primary: #0D1117;
            --text-secondary: #6c757d;
            --card-bg: #FFFFFF;
            --font-family: 'Inter', sans-serif;
        }

        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }
		
        body {
            font-family: var(--font-family);
            background-color: var(--light-bg);
            color: var(--text-secondary);
            font-size: 18px;
            line-height: 1.7;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .section {
            padding: 100px 0;
            position: relative;
            overflow: hidden;
        }
        
        h1, h2, h3, h4, h5, h6 {
            color: var(--text-primary);
            font-weight: 700;
        }

        h2.section-title {
            font-size: clamp(2rem, 5vw, 3rem);
            text-align: center;
            margin-bottom: 60px;
            font-weight: 800;
        }
        h2.section-title span {
            color: var(--primary-blue);
        }

        .btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 700;
            transition: all 0.3s ease;
            border: 2px solid transparent;
			font-size: 18px;
        }
        .btn-primary {
            background-color: var(--light-blue);
            color: #ffffff;
        }
        .btn-primary:hover {
            background-color: transparent;
            border-color: var(--light-blue);
            color: var(--light-blue);
            transform: translateY(-3px);
        }
        .btn-secondary {
            background-color: transparent;
            color: var(--text-primary);
            border-color: var(--border-color);
        }
        .btn-secondary:hover {
            background-color: var(--light-blue);
            border-color: var(--light-blue);
            color: #ffffff;
        }

        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            padding: 20px 0;
            transition: all 0.3s ease-in-out;
            background: transparent;
        }
        .header.scrolled {
            background-color: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(10px);
            box-shadow: 0 4px 20px rgba(0,0,0,0.05);
            padding: 15px 0;
        }
        .header.scrolled .nav-links-desktop a, .header.scrolled .logo {
            color: var(--text-primary);
        }
        .header.scrolled .nav-links-desktop a:hover {
            color: var(--light-blue);
        }

        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 1.8rem;
            color: #ffffff;
            text-decoration: none;
            font-weight: 800;
        }
        .logo span { color: var(--primary-blue); }
        .nav-links-desktop { display: flex; gap: 30px; }
        .nav-links-desktop a {
            color: #ffffff;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-links-desktop a:hover { color: var(--primary-blue); }
        .mobile-nav-toggle { display: none; }
		
		.nav-links-mobile {
			position: fixed;
			top: 0;
			right: -100%;
			width: 80%;
			height: 100vh;
			background-color: rgba(255, 255, 255, 0.95);
			backdrop-filter: blur(10px);
			z-index: 999;
			display: flex;
			flex-direction: column;
			align-items: center;
			justify-content: center;
			gap: 25px;
			transition: right 0.5s ease-in-out;
		}

		.nav-links-mobile.active {
			right: 0;
		}

		.nav-links-mobile a {
			color: var(--text-primary);
			font-size: 1.3rem;
			font-weight: 700;
			text-decoration: none;
		}
		
		.nav-links-mobile .btn-primary {
			color: #ffffff;
		}
		
		.btn-header-register {
			padding: 8px 24px;
			border: 2px solid rgba(255, 255, 255, 0.7);
			color: #ffffff;
			text-decoration: none;
			font-weight: 700;
			border-radius: 8px;
			transition: all 0.3s ease;
		}

		.btn-header-register:hover {
			background-color: #ffffff;
			color: var(--text-primary);
		}

		.header.scrolled .btn-header-register {
			color: var(--light-blue);
			border-color: var(--light-blue);
		}

		.header.scrolled .btn-header-register:hover {
			background-color: var(--light-blue);
			color: #ffffff;
		}

        #hero {
            padding-top: 150px;
			padding-bottom: 100px;
            min-height: 100vh;
            display: flex;
            align-items: center;
            text-align: center;
            background: linear-gradient(rgba(10, 20, 40, 0.6), rgba(10, 20, 40, 0.6)), url('vladivostok.jpg') no-repeat center center;
            background-size: cover;
            color: #ffffff;
        }
        #hero h1 {
            font-size: clamp(3rem, 8vw, 5.5rem);
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 20px;
            color: #ffffff;
			word-break: break-word;
        }
        #hero h1 span {
            background: -webkit-linear-gradient(315deg, #00BFFF 25%, #87CEFA);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        #hero p.subtitle {
            font-size: 1.25rem;
            max-width: 750px;
            margin: 0 auto 40px;
        }
        .hero-buttons { display: flex; justify-content: center; gap: 20px; margin-top: 50px; }
        .hero-buttons .btn-secondary {
            border-color: rgba(255, 255, 255, 0.5);
            color: #ffffff;
        }
        .hero-buttons .btn-secondary:hover {
            background-color: #ffffff;
            color: var(--text-primary);
            border-color: #ffffff;
        }
		
		.hero-date {
			font-size: 1.2rem;
			font-weight: 500;
		}

        #countdown {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 50px;
        }
        .countdown-item {
            background: rgba(0,0,0,0.2);
            padding: 20px;
            border-radius: 10px;
            border: 1px solid rgba(255,255,255,0.2);
            min-width: 100px;
        }
        .countdown-item div {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-blue);
        }
        .countdown-item span {
            font-size: 1rem;
            color: rgba(255,255,255,0.8);
        }

        .card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 30px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
        }
        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.05);
            border-color: var(--primary-blue);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }
        .feature-item .icon {
            font-size: 2.5rem;
            color: var(--primary-blue);
            margin-bottom: 20px;
        }

        .speakers-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }
        .speaker-card {
            text-align: center;
            cursor: pointer;
        }
        .speaker-card img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            margin-bottom: 20px;
            border: 4px solid var(--border-color);
            transition: border-color 0.3s;
        }
        .speaker-card:hover img {
            border-color: var(--primary-blue);
        }
        .speaker-card h5 {
            margin-bottom: 5px;
        }
        .speaker-card p.title {
            color: var(--primary-blue);
            font-weight: 500;
            margin-bottom: 15px;
        }
		
        .speaker-card.hidden {
            display: none;
        }

        .tabs {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }
        .tab-btn {
            padding: 10px 20px;
            background: #EDF2F7;
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s;
			font-size: 16px;
			flex: 1;
        }
        .tab-btn:hover {
            color: var(--text-primary);
            background: #e2e8f0;
        }
        .tab-btn.active {
            color: #ffffff;
            background: var(--light-blue);
            border-color: var(--light-blue);
        }
        .tab-content {
            display: none;
        }
        .tab-content.active {
            display: block;
        }

        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            align-items: stretch;
        }
        .price-card {
            display: flex;
            flex-direction: column;
        }
        .price-card .price {
            font-size: 2.5rem;
            font-weight: 700;
            margin: 15px 0;
        }
        .price-card .price span {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-secondary);
        }
        .price-card ul {
            list-style: none;
            margin: 20px 0;
            flex-grow: 1;
        }
        .price-card ul li {
            padding: 10px 0;
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }
        .price-card ul li i {
            color: var(--primary-blue);
        }

        .card-center {
            grid-column: 1 / -1;
            max-width: 360px;
            margin: 0 auto;
        }

        .footer {
            padding: 50px 0;
            background: var(--section-bg);
            border-top: 1px solid var(--border-color);
            text-align: center;
        }
        .footer .contacts {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            margin: 30px 0;
        }
        .footer .contacts a {
            color: var(--text-secondary);
            text-decoration: none;
        }
        .footer .contacts a:hover {
            color: var(--primary-blue);
        }
        .final-cta {
			background: linear-gradient(90deg, var(--primary-blue), var(--light-blue));
			padding: 50px;
			border-radius: 12px;
			margin-bottom: 50px;
			text-align: center;
			display: flex;
			flex-direction: column;
			align-items: center; 
        }
        .final-cta h2, .final-cta p {
            color: #ffffff;
        }
        .final-cta .btn {
            background: #ffffff;
            color: var(--light-blue);
        }

        @media (max-width: 768px) {
            .nav-links-desktop { display: none; }
			.btn-header-register { display: none; }
            .mobile-nav-toggle {
                display: block;
                color: #ffffff;
                font-size: 2rem;
                cursor: pointer;
                background: none;
                border: none;
                z-index: 1001;
            }
            .header.scrolled .mobile-nav-toggle {
                color: var(--text-primary);
            }
            .hero-buttons { flex-direction: column; }
            #countdown { flex-wrap: wrap; gap: 10px; }
            .countdown-item { flex-basis: 45%; }
		    #hero h1 {
				font-size: 2.5rem;
			}

            .card-center {
                grid-column: auto;
                max-width: 100%;
            }
        }

        .speaker-modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(13, 17, 23, 0.7);
            display: none;
            align-items: center;
            justify-content: center;
            z-index: 2000;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .speaker-modal-overlay.active {
            display: flex;
            opacity: 1;
        }

        .speaker-modal-content {
            background: var(--light-bg);
            padding: 40px;
            border-radius: 12px;
            max-width: 600px;
            width: 90%;
            max-height: 90vh;
            overflow-y: auto;
            position: relative;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            transform: scale(0.95);
            transition: transform 0.3s ease;
        }

        .speaker-modal-overlay.active .speaker-modal-content {
            transform: scale(1);
        }

        .speaker-modal-close {
            position: absolute;
            top: 10px;
            right: 20px;
            font-size: 3rem;
            line-height: 1;
            color: var(--text-secondary);
            cursor: pointer;
            transition: color 0.2s;
        }
        .speaker-modal-close:hover {
            color: var(--text-primary);
        }

        .speaker-modal-content img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            margin-bottom: 20px;
            border: 4px solid var(--primary-blue);
        }

        .speaker-modal-content h3 {
            font-size: 2rem;
            margin-bottom: 5px;
        }

        .speaker-modal-content p.title {
            color: var(--primary-blue);
            font-weight: 500;
            margin-bottom: 20px;
            font-size: 1.1rem;
        }

        .speaker-modal-content #modal-description {
            text-align: left;
            font-size: 1rem;
            line-height: 1.7;
        }





.program-tabs {
    border-bottom: 1px solid var(--border-color);
}
.program-tabs .tab-btn {
    flex: unset;
    padding: 12px 25px;
    margin-bottom: -1px;
    border-bottom: 3px solid transparent;
    border-radius: 8px 8px 0 0;
}
.program-tabs .tab-btn.active {
    border-color: var(--primary-blue);
    background-color: var(--light-bg);
    color: var(--text-primary);
}

.program-timeline {
    padding-top: 40px;
    position: relative;
}

.program-timeline::before {
    content: '';
    position: absolute;
    top: 55px;
    left: 140px;
    width: 3px;
    height: calc(100% - 55px);
    background-color: var(--primary-blue);
}

.program-item {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
    position: relative;
}

.program-time {
    flex: 0 0 140px;
    padding-right: 40px;
    text-align: right;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
}

.program-item::before {
    content: '';
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 134px;
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: var(--light-bg);
    border: 3px solid var(--primary-blue);
    z-index: 1;
}

.program-card {
    flex: 1;
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
}

.program-header h4 {
    margin: 5px 0 10px;
    font-size: 1.25rem;
}
.program-tag {
    display: inline-block;
    padding: 3px 10px;
    font-size: 0.8rem;
    font-weight: 700;
    border-radius: 6px;
    color: #fff;
    text-transform: uppercase;
}
.tag-plenary { background-color: #007BFF; }
.tag-panel { background-color: #6f42c1; }
.tag-workshop { background-color: #fd7e14; }
.tag-round-table { background-color: #20c997; }
.tag-interactive { background-color: #dc3545; }
.tag-official { background-color: #6c757d; }
.tag-break { background-color: #ffc107; color: #333; }
.tag-public-talk { background-color: #17a2b8; }
.tag-battle { background-color: #28a745; }
.tag-international { background-color: #343a40; }
.tag-author-session { background-color: #d63384; }


.program-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 15px;
}
.program-meta i {
    color: var(--primary-blue);
}

.program-toggle {
    background: none;
    border: none;
    color: var(--primary-blue);
    font-weight: 700;
    cursor: pointer;
    padding: 0;
    font-size: 1rem;
}
.program-toggle i {
    transition: transform 0.3s ease;
}
.program-card.active .program-toggle i {
    transform: rotate(180deg);
}

.program-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-out, margin-top 0.5s ease-out;
}

.program-card.active .program-details {
    max-height: 1500px;
    margin-top: 20px;
    transition: max-height 1s ease-in, margin-top 0.5s ease-in;
}

.program-details ul {
    list-style-position: inside;
    padding-left: 10px;
}
.program-details hr {
    border: none;
    height: 1px;
    background-color: var(--border-color);
    margin: 15px 0;
}
.program-speakers p { margin-bottom: 5px; }

.parallel-sessions .program-time {
    padding-top: 0;
}
.parallel-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    width: 100%;
}
.parallel-container.three-cols {
    grid-template-columns: 1fr 1fr 1fr;
}
.parallel-sessions .program-card {
    margin: 0;
}

.closing-notes {
    color: var(--text-secondary);
    margin-top: 10px;
}
.program-card .program-speakers p, .program-card > .program-header > p {
    font-size: 0.9rem;
}

.program-extras {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 60px;
}
.extra-card {
    background-color: var(--light-bg);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    border: 1px solid var(--border-color);
}
.extra-card .extra-icon {
    font-size: 3rem;
    color: var(--light-blue);
    margin-bottom: 15px;
}
.extra-card h3 {
    margin-bottom: 10px;
}
.extra-card .btn {
    margin-top: 20px;
}

@media (max-width: 768px) {
.program-timeline::before {
    left: 20px;
}
.program-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
}
.program-item::before {
    top: 12px;
    left: 12px;
    transform: translateY(0);
}
.program-time {
    text-align: left;
    padding-left: 40px;
    flex-basis: auto;
}
.program-card {
    margin-left: 40px;
    width: calc(100% - 40px);
    box-sizing: border-box;
}
.program-item.parallel-sessions .parallel-container {
    margin-left: 40px;
    width: calc(100% - 40px);
    box-sizing: border-box;
}
.parallel-sessions .program-card {
    margin-left: 0;
    width: 100%;
}
.program-item.parallel-sessions::before {
    display: block;
}
.parallel-container,
.parallel-container.three-cols,
.program-extras {
    grid-template-columns: 1fr;
}
.program-item.parallel-sessions {
    margin-left: 0;
}
}


.partners-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
    margin-top: 40px;
}

.partner-logo img {
    max-height: 80px;
    max-width: 200px;
    width: auto;
    object-fit: contain;
    opacity: 0.7;
    transition: all 0.3s ease;
}

.partner-logo img:hover {
    opacity: 1;
    transform: scale(1.05);
}
@media (max-width: 768px) {
    .partners-grid {
        flex-direction: column;
        gap: 40px;
    }
}