body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #ffffff;
  color: #4b2e2e;
}

:root {
  --menu-width: 200px;
  --menu-padding: 20px;
  --logo-height: 150px;
  --logo-top: 20px;
  --logo-left: 21px;
  --after-logo-gap: 12px;
}

/* Left menu/sidebar */
.menu {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--menu-width);
  height: 100vh;
  background-color: #040615;
  background-image: url("images/GRAPHICS/sidebar3.jpg");
  background-repeat: repeat-y;
  background-position: top center;
  background-size: 100% auto;
  padding: var(--menu-padding);
  box-sizing: border-box;
  z-index: 1000;
}

/* Logo absolutely positioned inside sidebar */
.menu .logo {
  position: absolute;
  top: var(--logo-top);
  left: var(--logo-left);
  height: var(--logo-height);
  width: auto;
  display: block;
}

/* Sidebar title */
.menu h2 {
  margin-top: calc(var(--logo-height) + var(--after-logo-gap));
  margin-bottom: 12px;
  text-align: center;
  color: #79E4FF;
}

/* Sidebar links */
.menu a {
  display: block;
  margin: 10px 0;
  color: #79E4FF;
  text-decoration: none;
  font-weight: bold;
  text-align: center;
}

.menu a:hover {
  color: #ffffff;
}

/* Right content area */
.content {
  margin-left: var(--menu-width);
  padding: 20px;
}

h1 {
  color: #ff6f61;
}

/* Gallery layout */
.gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 10px; /* space between images */
}

.gallery img {
  width: 200px; /* thumbnail size */
  height: auto;
  cursor: pointer;
  border: 2px solid #fff;
  transition: transform 0.2s;
}

.gallery img:hover {
  transform: scale(1.05);
}

/* Lightbox overlay */
#lightbox {
  display: none; /* hidden by default */
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0,0,0,0.85);
  justify-content: center;
  align-items: center;
  z-index: 2000;
}

#lightbox img {
  max-width: 90%;
  max-height: 90%;
  box-shadow: 0 0 20px rgba(0,0,0,0.8);
}

#close {
  position: absolute;
  top: 20px;
  right: 30px;
  font-size: 40px;
  color: #fff;
  cursor: pointer;
  font-weight: bold;
  user-select: none;
}