/* ----------------------
  BODY & CANVAS
------------------------*/
body {
  margin: 0;
  overflow: hidden;
  font-family: "Helvetica Neue", sans-serif;
  background: #f8fafc; /* light biological background */
  color: #222;
}

canvas {
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
}

/* ----------------------
  SLIDE STYLING
------------------------*/
.slide {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 75%;
  max-width: 900px;
  max-height: 80vh;
  overflow-y: auto;
  padding: 30px 40px;
  border-radius: 16px;
  background: rgba(255,255,255,0.95);
  box-shadow: 0 4px 25px rgba(0,0,0,0.15);
  text-align: left;
  opacity: 0;
  pointer-events: none;
  transition: transform 0.8s ease, opacity 0.8s ease;
}

.slide.active {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, -50%) scale(1);
  z-index: 10;
}

h1 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: #1b4332;
  text-align: center;
}

h2 {
  font-size: 1.5rem;
  margin-top: 20px;
  color: #2a9d8f;
}

p {
  font-size: 1.1rem;
  line-height: 1.6;
  margin: 10px 0;
}

ul {
  margin: 10px 0 10px 20px;
  font-size: 1.1rem;
}

li {
  margin-bottom: 6px;
}

img {
  max-width: 100%;
  border-radius: 8px;
  margin: 15px 0;
}

.controls {
  margin-top: 20px;
  display: flex;
  justify-content: space-between;
}

button {
  background: #2a9d8f;
  border: none;
  padding: 10px 20px;
  border-radius: 10px;
  color: white;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background: #1b6d63;
}

button:disabled {
  background: #ccc;
  cursor: not-allowed;
}

/* Scrollbar for slide content */
.slide::-webkit-scrollbar {
  width: 8px;
}

.slide::-webkit-scrollbar-track {
  background: rgba(0,0,0,0.05);
  border-radius: 4px;
}

.slide::-webkit-scrollbar-thumb {
  background: rgba(42,157,143,0.6);
  border-radius: 4px;
}

/* ----------------------
  MEDIA QUERIES
------------------------*/
@media(max-width: 768px){
  .slide {
    width: 90%;
    padding: 20px;
  }
  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.3rem; }
  p, ul { font-size: 1rem; }
}


/*----------------------
navigation
-----------------------*/

.navbar {
  background-color: #003366;
  padding: 0.5rem 1rem;
  margin-bottom: 2rem;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 999;
  align: left;
}

.navbar ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin: 0;
  padding: 0;
}

.navbar a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: 4px;
  transition: background-color 0.2s ease;
}

.navbar a:hover {
  background-color: #0055aa;
}

#menu-toggle {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 1000;
  font-size: 2rem;
  background: #2a9d8f;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 10px;
  cursor: pointer;
}

#side-menu {
  position: fixed;
  top: 0;
  left: -250px; /* hidden offscreen */
  width: 250px;
  height: 100%;
  background: rgba(255,255,255,0.95);
  box-shadow: 4px 0 12px rgba(0,0,0,0.3);
  border-radius: 0 8px 8px 0;
  transition: left 0.3s ease;
  z-index: 999;
  padding-top: 60px; /* space for toggle */
}

#side-menu ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

#side-menu li {
  margin: 15px 0;
  text-align: center;
}

#side-menu a {
  text-decoration: none;
  color: #1b4332;
  font-weight: 600;
  font-size: 1.1rem;
  display: block;
  padding: 10px 0;
  transition: background 0.2s;
}

#side-menu a:hover {
  background: #2a9d8f;
  color: white;
}

/* Class to show menu */
#side-menu.open {
  left: 0;
}

#side-menu {
  position: fixed;
  top: 0;
  left: -250px; /* hidden offscreen */
  width: 250px;
  height: 100%;
  background: rgba(255,255,255,0.95);
  box-shadow: 4px 0 12px rgba(0,0,0,0.3);
  border-radius: 0 8px 8px 0;
  transition: left 0.3s ease;
  z-index: 999;
  padding-top: 60px; /* space for toggle button */
  
  /* Scrollable */
  overflow-y: auto;
  overscroll-behavior: contain;
}

#side-menu::-webkit-scrollbar {
  width: 8px;
}

#side-menu::-webkit-scrollbar-track {
  background: rgba(0,0,0,0.05);
  border-radius: 4px;
}

#side-menu::-webkit-scrollbar-thumb {
  background: rgba(42,157,143,0.6);
  border-radius: 4px;
}

#side-menu::-webkit-scrollbar-thumb:hover {
  background: rgba(42,157,143,0.9);
}