:root {
    --primary-color: #1a5f7a;
    --secondary-color: #86c6da;
    --accent-color: #ff6b6b;
    --background-color: #A5D8FF;
    --text-color: #2c3e50;
    --light-text: #ffffff;
    --border-radius: 16px;
    --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    position: relative;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Убираем градиентный фон и оставляем только жидкие эффекты для стеклянных элементов */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 15% 50%, rgba(134, 198, 218, 0.1) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(255, 107, 107, 0.08) 0%, transparent 25%),
        radial-gradient(circle at 50% 80%, rgba(26, 95, 122, 0.1) 0%, transparent 25%);
    z-index: -1;
    animation: liquidMove 8s ease-in-out infinite;
    pointer-events: none;
}

@keyframes liquidMove {
    0%, 100% { transform: translateY(0px) scale(1); }
    50% { transform: translateY(-10px) scale(1.01); }
}

.video-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.4;
    object-fit: cover;
}

header {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(20px) saturate(1.8);
    -webkit-backdrop-filter: blur(20px) saturate(1.8);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color); /* Возвращаем основной цвет */
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color); /* Возвращаем темный текст */
    font-weight: 500;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    transition: var(--transition);
    position: relative;
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.registration-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.registration-link {
    display: flex;
    align-items: center;
    padding: 0.5rem 1.5rem; /* как у .nav-menu a */
    cursor: pointer;
}

.registration-tooltip {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translate(-50%, 0);
    padding: 0.6rem 0.9rem;
    background: #ffffff;
    color: var(--text-color);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    font-size: 0.85rem;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: var(--transition);
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    min-width: 220px;
}

.registration-tooltip a {
    text-decoration: none;
    color: var(--text-color);
    padding: 0.3rem 0.4rem;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.registration-tooltip a:hover {
    background: rgba(255, 255, 255, 1);
    color: var(--primary-color);
}

.registration-wrapper:hover .registration-tooltip,
.registration-wrapper.tooltip-open .registration-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
    pointer-events: auto;
}

.nav-menu a:hover:not(.soon) {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px) scale(1.05);
    box-shadow: var(--shadow-md);
    color: var(--primary-color);
}

.nav-menu a.soon {
    opacity: 0.6;
    cursor: not-allowed;
    background: rgba(245, 245, 245, 0.6);
}

.attention-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--accent-color);
    color: var(--light-text);
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
    animation: pulse 2s infinite;
    backdrop-filter: blur(10px);
}

.language-switcher {
    display: flex;
    gap: 0.5rem;
}

.language-switcher button {
    padding: 0.5rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.4);
    background: rgba(255, 255, 255, 0.6);
    color: var(--text-color);
    cursor: pointer;
    border-radius: 50px;
    transition: var(--transition);
    font-weight: 500;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.language-switcher button:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
}

.language-switcher button.active {
    background: rgba(26, 95, 122, 0.8);
    border-color: rgba(26, 95, 122, 0.3);
    color: var(--light-text);
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

section {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    backdrop-filter: blur(20px) saturate(1.8);
    -webkit-backdrop-filter: blur(20px) saturate(1.8);
    position: relative;
    overflow: hidden;
}

section::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.6s ease;
}

section:hover::before {
    left: 100%;
}

section:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.2;
}

h2 {
    font-size: 2rem;
    margin-bottom: 1.2rem;
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: -0.5px;
}

p {
    margin-bottom: 1.2rem;
    font-size: 1.1rem;
    color: var(--text-color);
    opacity: 0.9;
}

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
    justify-content: center;
}

.gallery-item {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    aspect-ratio: 16/9;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.gallery-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-lg);
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.text-block {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    margin: 2rem 0;
    transition: var(--transition);
    backdrop-filter: blur(20px) saturate(1.8);
    -webkit-backdrop-filter: blur(20px) saturate(1.8);
}

.text-block:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.text-block ul {
    list-style: none;
    margin: 1.5rem 0;
}

.text-block li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
    font-size: 1.1rem;
    color: var(--text-color);
    opacity: 0.95;
}

.text-block li::before {
    content: "•";
    color: var(--primary-color);
    font-size: 1.5rem;
    position: absolute;
    left: 0;
    top: -0.2rem;
    opacity: 0.8;
}

/* Speakers list */
.speakers-section {
    margin-top: 2rem;
}

.speakers-list {
    display: flex;
    flex-direction: column;
}

.speaker-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.5rem 0;
    border-bottom: 1px solid rgba(26, 95, 122, 0.35);
}

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

.speaker-photo {
    width: 96px;
    height: 96px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: var(--shadow-md);
    border: 2px solid rgba(255, 255, 255, 0.7);
    flex-shrink: 0;
}

.speaker-info {
    flex: 1;
}

.speaker-name {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 0.4rem;
    color: var(--primary-color);
}

.speaker-description {
    margin: 0;
    font-size: 1rem;
    color: var(--text-color);
    opacity: 0.9;
}

.speaker-description-en {
    margin-top: 0.2rem;
    font-size: 0.95rem;
    opacity: 0.8;
}

footer {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px) saturate(1.8);
    -webkit-backdrop-filter: blur(20px) saturate(1.8);
    padding: 2rem;
    margin-top: 4rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    color: var(--text-color);
    font-size: 0.95rem;
    line-height: 1.6;
    position: relative;
    z-index: 500;
}

footer p {
    max-width: 1200px;
    margin: 0 auto;
    opacity: 0.9;
    position: relative;
    padding: 0.5rem;
    border-radius: var(--border-radius);
}

/* Masonry Gallery */
.masonry-gallery {
    columns: 4 300px;
    column-gap: 1.5rem;
    margin: 2rem 0;
}

.masonry-item {
    break-inside: avoid;
    margin-bottom: 1.5rem;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.masonry-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.masonry-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.masonry-item:hover img {
    transform: scale(1.05);
}

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

.burger-menu span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 5px 0;
    transition: 0.3s;
}

.burger-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

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

.burger-menu {
    display: none;
    z-index: 1000;
}

/* Адаптивность остается без изменений */
@media (max-width: 768px) {
    .nav-container {
        padding: 1rem;
        justify-content: space-between;
        gap: 1rem;
        position: relative;
    }

    .burger-menu {
        display: block;
        order: 1;
        margin-right: 0.5rem;
        flex: 0 0 auto;
    }

    .logo {
        order: 2;
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        flex-shrink: 0;
        white-space: nowrap;
    }

    .language-switcher {
        order: 3;
        margin-left: auto;
        position: static !important;
        transform: none !important;
        background: transparent !important;
        box-shadow: none !important;
        padding: 0 !important;
        display: flex;
        gap: 0.5rem;
    }

    .language-switcher button {
        padding: 0.2rem 0.4rem;
        font-size: 0.9rem;
        background: rgba(255, 255, 255, 0.6);
        color: var(--text-color);
        border: 1px solid rgba(255, 255, 255, 0.3);
    }

    .language-switcher button.active {
        background: rgba(26, 95, 122, 0.8);
        color: var(--light-text);
    }

    .nav-menu {
        position: fixed;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100vh;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 5rem 2rem;
        transition: 0.3s;
        z-index: 900;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu a {
        font-size: 1.2rem;
        padding: 1rem 2rem;
        width: 100%;
        max-width: 300px;
        text-align: center;
        margin: 0.5rem 0;
        color: var(--text-color);
        background: rgba(255, 255, 255, 0.7);
    }

    header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        z-index: 1000;
        padding: 0;
    }

    main {
        margin-top: 60px;
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
        line-height: 1.2;
        margin: 1rem 0;
        word-wrap: break-word;
        hyphens: auto;
    }

    h2 {
        font-size: 1.6rem;
        margin-bottom: 1.2rem;
    }

    p {
        font-size: 1.1rem;
        line-height: 1.6;
        margin-bottom: 1rem;
    }

    section {
        padding: 1.5rem;
        margin-bottom: 2rem;
    }

    .speaker-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .speaker-photo {
        width: 80px;
        height: 80px;
    }

    .text-block {
        padding: 2rem;
    }

    .text-block h2 {
        font-size: 1.6rem;
        margin-bottom: 1.2rem;
    }

    .text-block p {
        font-size: 1.1rem;
        line-height: 1.6;
        margin-bottom: 1rem;
    }

    .text-block li {
        font-size: 1.1rem;
        margin-bottom: 1rem;
        padding-left: 1.5rem;
    }

    .attention-badge {
        font-size: 0.7rem;
        padding: 2px 6px;
        top: -8px;
        right: -8px;
    }

    footer {
        padding: 1.5rem;
        font-size: 0.9rem;
        margin-top: 2rem;
    }
}

@media (max-width: 480px) {
    .language-switcher {
        position: fixed;
        bottom: 1rem;
        left: 50%;
        transform: translateX(-50%);
        background: rgba(255, 255, 255, 0.9);
        padding: 0.5rem;
        border-radius: var(--border-radius);
        box-shadow: var(--shadow-md);
        backdrop-filter: blur(20px);
    }

    footer {
        padding: 1rem;
        font-size: 0.85rem;
    }
}