@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

body {
  font-family: 'Inter', sans-serif;
  background: #f5f6fa;
  margin: 0;
  padding: 0;
  color: #222;
  height: 100vh;
  width: 100vw;
  min-height: 100vh;
  min-width: 100vw;
  box-sizing: border-box;
}

.container {
  width: 100vw;
  max-width: none;
  max-height: none;
  margin: 0;
  background: #fff;
  border-radius: 0;
  box-shadow: none;
  display: flex;
  padding: 0;
}

.sidebar {
  width: 260px;
  background: #f7f8fa;
  padding: 32px 0 32px 24px;
  border-right: 1px solid #ececec;
  min-height: 700px;
}

.sidebar h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 32px;
  color: #888;
  letter-spacing: 1px;
}

.sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar li {
  margin-bottom: 18px;
  font-size: 1rem;
  color: #444;
  cursor: pointer;
  padding: 8px 16px 8px 12px;
  border-radius: 8px 0 0 8px;
  transition: background 0.2s, box-shadow 0.2s;
  display: flex;
  align-items: center;
  gap: 10px;
}

.sidebar li.active {
  background: #fff;
  color: #5a3ff6;
  box-shadow: 0 2px 8px rgba(90,63,246,0.10);
  font-weight: 600;
  border-right: 4px solid #5a3ff6;
  z-index: 1;
  position: relative;
}

.sidebar li svg {
  flex-shrink: 0;
  margin-right: 6px;
  width: 18px;
  height: 18px;
  display: inline-block;
  vertical-align: middle;
}

.main-content {
  flex: 1;
  padding: 40px 40px 40px 40px;
  display: flex;
  flex-direction: column;
  overflow-x: scroll;
}

.video-section {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 1px 8px rgba(0,0,0,0.04);
  padding: 0;
  margin-bottom: 32px;
}

.video-aspect {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: 12px 12px 0 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-aspect iframe {
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  border: none;
  border-radius: 12px 12px 0 0;
  display: block;
  object-fit: contain;
}

.video-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px 8px 8px;
  font-size: 0.98rem;
  color: #888;
}

.course-title {
  font-size: 2rem;
  font-weight: 700;
  margin: 18px 0 10px 0;
  color: #222;
}

.course-info {
  display: flex;
  gap: 32px;
  margin-bottom: 24px;
  color: #888;
  font-size: 1rem;
}

.other-courses {
  margin-top: 32px;
}

.other-courses-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 18px;
  color: #333;
}

.other-courses-list {
  display: flex;
  gap: 24px;
  overflow-x: auto;
}

.course-card {
  background: #f7f8fa;
  border-radius: 12px;
  box-shadow: 0 1px 6px rgba(0,0,0,0.03);
  width: 320px;
  min-width: 320px;
  padding: 0 0 16px 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.card-aspect {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 ratio */
  height: 0;
  overflow: hidden;
  background: #000;
  border-radius: 12px 12px 0 0;
}

.card-aspect iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: 12px 12px 0 0;
  display: block;
}

.course-card-content {
  padding: 14px 18px 0 18px;
  flex: 1;
}

.course-card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: #222;
}

.course-card-meta {
  font-size: 0.95rem;
  color: #888;
  display: flex;
  align-items: center;
  gap: 8px;
}

@media (max-width: 900px) {
  .container {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid #ececec;
    min-height: unset;
    padding: 18px 0 18px 18px;
  }
  .main-content {
    padding: 24px 12px;
  }
  .other-courses-list {
    gap: 12px;
  }
  .course-card {
    width: 220px;
    min-width: 220px;
  }
}