body {
    margin: 0;
    overflow: auto;
    font-family: Arial, sans-serif;
}
#sidebar {
    width: 260px;
    height: 100vh;
    background: #1f1f1f;
    color: white;
    padding: 20px;
    box-sizing: border-box;
    position: fixed;
    overflow-y: auto;
}

#sidebar h2, #sidebar h3 {
    margin-top: 0;
}

#sidebar input, #sidebar select, #sidebar button {
    width: 100%;
    margin-bottom: 15px;
}

#viewer {
    position: absolute;
    left: 260px;
    top: 0;
    width: calc(100% - 260px);
    height: 100%;
}

.banner {
  background: #fff8f0;
  border: 2px solid #ff9d47;
  color: #cc5200;
  padding: 12px 22px;
  margin-top: 20px;
  display: inline-block;
  border-radius: 14px;
  font-size: 20px;
  font-weight: 600;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
.subtitle {
  font-size: 26px;
  color: #444;
  margin-top: 10px;
  font-weight: 400;
}

.pc-container {
  position: relative;
  width: 100%;
  height: 500px;
  border-radius: 12px;
  overflow: hidden;
}

.pc-nav-left,
.pc-nav-right {
  position: absolute;
  top: 0;
  width: 60px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: background 0.2s;
  color: white;
  font-size: 40px;
  font-weight: 200;
  user-select: none;
}

.pc-nav-left { left: 0; }
.pc-nav-right { right: 0; }

.pc-nav-left:hover,
.pc-nav-right:hover {
  background: rgba(0,0,0,0.15);
}

.segmentation-video {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  display: block;
}

/* Fix the arrows being squeezed to the left */
#videoPrev { left: 0; }
#videoNext { right: 0; }