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

body {
  font-family: "Georgia", serif; /* академический стиль */
  color: #1a1a1a;
  background-color: #f9f9f7;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* Шапка */
.site-header {
  border-bottom: 2px solid #2c3e50;
  margin-bottom: 40px;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: #2c3e50;
  letter-spacing: 0.5px;
}

.main-nav a {
  text-decoration: none;
  color: #333;
  margin-left: 24px;
  font-family: Arial, sans-serif;
  font-size: 15px;
  transition: color 0.2s;
}

.main-nav a:hover {
  color: #c0392b;
}

/* Основной контент */
.page-content {
  padding-bottom: 60px;
}

h1 {
  font-family: "Georgia", serif;
  font-size: 36px;
  margin-bottom: 10px;
  color: #2c3e50;
}

.subtitle {
  font-size: 18px;
  color: #555;
  margin-bottom: 40px;
  max-width: 700px;
}

/* Сетка видео */
.videos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
}

/* Карточка видео */
.video-card {
  background: #fff;
  border: 1px solid #e0e0dc;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  transition: box-shadow 0.3s, transform 0.3s;
}

.video-card:hover {
  box-shadow: 0 8px 20px rgba(0,0,0,0.12);
  transform: translateY(-2px);
}

.video-preview {
  position: relative;
  width: 100%;
  aspect-ratio_: 16 / 9; /* пропорции 16:9 */
  overflow: hidden;
  background-color: #000;
}

.video-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.play-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: rgba(0, 0, 0, 0.7);
  color: #fff;
  padding: 14px 22px;
  border-radius: 50px;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  display:none;
}

.video-title {
  font-family: "Georgia", serif;
  font-size: 20px;
  padding: 18px 20px;
  color: #2c3e50;
}

.video-description {
  padding: 0 20px 16px;
  color: #555;
  font-size: 14px;
  flex-grow: 1;
}

.btn-play {
  margin: 0 20px 20px;
  padding: 10px 20px;
  background-color: #c0392b;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  transition: background-color 0.2s;
}

.btn-play:hover {
  background-color: #a93226;
}

/* iframe внутри превью */
.video-preview iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* Футер */
.site-footer {
  border-top: 2px solid #e0e0dc;
  padding: 30px 0;
  color: #777;
  font-size: 14px;
  text-align: center;
}

/* Адаптив */
@media (max-width: 600px) {
  .header-content {
    flex-direction: column;
    gap: 16px;
  }

  .main-nav a {
    margin: 8px 12px;
  }

  h1 {
    font-size: 28px;
  }
}

/* Контейнер модального окна */
.video-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

/* Обертка для сохранения пропорций видео 16:9 */
.video-modal-content {
    position: relative;
    width: 90%;
    max-width: 960px;
    aspect-ratio: 16 / 9;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

/* Сам iframe внутри модального окна */
.video-modal-content iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Кнопка закрытия (крестик) */
.video-modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    color: #fff;
    font-size: 30px;
    cursor: pointer;
    background: none;
    border: none;
}