/* ===== Общие стили и Переменные ===== */
:root {
    --bg-color: #fafafa;
    --text-color: #1a1a1a;
    --text-secondary: #666666;
    --accent-color: #000000;
    --border-color: #e5e5e5;
    --card-bg: #ffffff;
    --max-width: 1100px;
}

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

html {
    scroll-behavior: smooth;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

body {
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Общий стиль для подзаголовков всех секций ===== */
.section-subtitle-block {
    font-size: 15px !important;
    color: #666666 !important;
    margin-bottom: 32px !important;
    max-width: 700px;
    line-height: 1.6;
}

/* ===== Кнопки и Компоненты ===== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    font-weight: 500;
    font-size: 15px;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.2s ease, color 0.2s ease;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--accent-color);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: #333333;
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #f0f0f0;
}

.btn-link {
    color: var(--text-color);
    background: transparent;
    padding: 12px 16px;
}

.btn-link:hover {
    text-decoration: underline;
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    background-color: #eaeaea;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 2px;
    margin-bottom: 16px;
}

/* ===== Шапка сайта ===== */
.main-header {
    background-color: rgba(250, 250, 250, 0.8);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
}

.header-container {
    height: 70px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.main-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    margin-left: 24px;
    transition: color 0.2s ease;
}

.main-nav a:hover {
    color: var(--text-color);
}

.main-nav a.btn-secondary {
    color: var(--text-color);
}

/* ===== Секция Hero ===== */
.hero-section {
    padding-top: 150px;
    padding-bottom: 90px;
    border-bottom: 1px solid var(--border-color);
}

.hero-container {
    display: flex;
    flex-direction: column-reverse;
    gap: 40px;
    align-items: center;
}

@media (min-width: 768px) {
    .hero-container {
        display: grid;
        grid-template-columns: 1.2fr 1fr;
        gap: 60px;
        align-items: center;
    }
}

.hero-content {
    width: 100%;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 32px;
}

.hero-highlights {
    margin-bottom: 40px;
    padding-left: 16px;
    border-left: 3px solid var(--accent-color);
}

.hero-highlights .highlight-item {
    font-size: 16px;
    color: var(--text-color);
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.hero-image-wrapper {
    width: 100%;
    max-width: 380px;
    display: flex;
    justify-content: center;
}

.hero-image {
    width: 100%;
    height: auto;
    object-fit: cover;
    border-radius: 4px;
    transition: transform 0.3s ease;
}

.hero-image:hover {
    transform: scale(1.02);
}

/* ===== Секция Цифр ===== */
.metrics-section {
    padding: 60px 0;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
}

.metric-card {
    text-align: left;
}

.metric-num {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--accent-color);
    margin-bottom: 4px;
}

.metric-label {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ===== Секция Мероприятий ===== */
.events-section {
    padding: 90px 0;
    border-bottom: 1px solid var(--border-color);
}

.events-tags-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.event-tag {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 6px 14px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-color);
    border-radius: 4px;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.event-tag:hover {
    background-color: #f1f1f1;
    border-color: #b3b3b3;
    cursor: default;
}

/* ===== Заголовки ===== */
.section-title {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}

/* ===== Секция Тем выступлений ===== */
.topics-section {
    padding: 100px 0;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.topic-item {
    padding: 24px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.topic-item:hover {
    border-color: #b3b3b3;
}

.topic-icon {
    font-weight: bold;
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.topic-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.topic-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== Секция Примеров выступлений ===== */
.video-section {
    padding: 100px 0;
    border-bottom: 1px solid var(--border-color);
}

.video-links-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

@media (min-width: 640px) {
    .video-links-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.video-card {
    display: block;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 24px;
    border-radius: 4px;
    text-decoration: none;
    color: var(--text-color);
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.video-card:hover {
    border-color: #b3b3b3;
    background-color: #fcfcfc;
}

.video-card h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    line-height: 1.4;
}

.video-card-sub {
    display: block;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.video-card h4 + .video-card-action {
    margin-top: 16px;
}

.video-card-action {
    display: inline-block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.video-card:hover .video-card-action {
    color: var(--accent-color);
    text-decoration: underline;
}

/* ===== Форматы работы ===== */
.formats-section {
    padding: 100px 0;
    border-bottom: 1px solid var(--border-color);
}

.section-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

@media (min-width: 768px) {
    .section-layout {
        grid-template-columns: 3fr 5fr;
        gap: 60px;
    }
}

.formats-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

@media (min-width: 480px) {
    .formats-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

.format-card {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.format-card h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.format-card p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ===== Секция Галереи ===== */
.gallery-section {
    padding: 100px 0;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

@media (min-width: 768px) {
    .gallery-grid {
        grid-template-columns: repeat(3, 1fr);
        grid-auto-rows: 240px;
    }
}

.gallery-item {
    overflow: hidden;
    border-radius: 4px;
    position: relative;
    background-color: #f5f5f5;
    cursor: pointer;
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.5s cubic-bezier(0.25, 1, 0.5, 1), opacity 0.4s ease, filter 0.4s ease;
}

@media (min-width: 768px) {
    .gallery-item.item-wide {
        grid-column: span 2;
    }
    .gallery-item.item-tall {
        grid-row: span 2;
    }
}

.gallery-grid:hover .gallery-item:not(:hover) img {
    opacity: 0.6;
    filter: grayscale(15%);
}

.gallery-item:hover img {
    transform: scale(1.03);
    opacity: 1 !important;
    filter: grayscale(0%) !important;
}

/* ===== Попап галереи ===== */
.modal {
    display: none; 
    position: fixed; 
    z-index: 1000; 
    padding-top: 60px; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgba(26, 26, 26, 0.9); 
    backdrop-filter: blur(8px);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
}

.modal-content {
    margin: auto;
    display: block;
    width: auto;
    max-width: 90%;
    max-height: 85vh;
    border-radius: 4px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    transform: scale(0.95);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #ffffff;
    font-size: 40px;
    font-weight: 300;
    transition: color 0.2s ease;
    cursor: pointer;
    user-select: none;
    z-index: 1001;
}

.modal-close:hover {
    color: #b3b3b3;
}

/* ===== Секция Контактов ===== */
.contacts-section {
    padding: 100px 0;
}

.contacts-card {
    background-color: var(--accent-color);
    color: #ffffff;
    padding: 48px;
    border-radius: 6px;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.contacts-card .section-title {
    color: #ffffff;
    margin-bottom: 16px;
}

.contacts-text {
    font-size: 16px;
    color: #b3b3b3;
    max-width: 500px;
    margin: 0 auto 32px auto;
}

.channels {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

@media (min-width: 580px) {
    .channels {
        flex-direction: row;
        justify-content: center;
    }
}

.channel-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 16px 32px;
    border-radius: 4px;
    text-decoration: none;
    min-width: 240px;
    transition: background-color 0.2s ease;
}

.channel-link:hover {
    background-color: rgba(255, 255, 255, 0.18);
}

.channel-title {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #b3b3b3;
    margin-bottom: 4px;
}

.channel-handle {
    font-size: 16px;
    font-weight: 600;
    color: #ffffff;
}

/* ===== Подвал ===== */
.main-footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    background-color: var(--card-bg);
}

.footer-container {
    text-align: center;
    font-size: 13px;
    color: var(--text-secondary);
}

/* ===== Адаптивность ===== */
@media (max-width: 767px) {
    .main-nav {
        display: none;
    }
    .hero-title {
        font-size: 36px;
    }
    .hero-subtitle {
        font-size: 18px;
    }
    .hero-section {
        padding-top: 100px;
        padding-bottom: 60px;
    }
    .hero-image-wrapper {
        max-width: 280px;
    }
    .formats-section, .contacts-section, .events-section, .video-section, .gallery-section {
        padding: 60px 0;
    }
    .contacts-card {
        padding: 32px 20px;
    }
    .modal-content {
        max-width: 95%;
    }
    .modal-close {
        top: 15px;
        right: 20px;
        font-size: 35px;
    }
}