/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  scroll-behavior: smooth;
  overflow-x: hidden;
  font-family: 'Montserrat', sans-serif;
  background-color: #100839;
  color: #f0e9d6;
}

/* Navbar */
.navbar {
  background: linear-gradient(90deg, #1f1359, #23197a);
  color: white;
  padding: 1rem;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-size: 1.2rem;
  font-weight: bold;
  color: white;
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links li a {
  color: white;
  text-decoration: none;
  font-weight: 500;
}

.hamburger {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Grid Layout */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  padding: 2rem;
  width: 100%;
}

/* Section Card */
.section {
  position: relative;
  background-size: cover;
  background-position: center;
  border-radius: 14px;
  overflow: hidden;
  text-decoration: none;
  transition: transform 0.4s ease, box-shadow 0.4s ease;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  height: 350px;
}

.section:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.4);
}

/* Overlay */
.overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(1px);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s ease;
}

.section:hover .overlay {
  background: rgba(0, 0, 0, 0.45);
}

.overlay span {
  color: white;
  font-size: 2rem;
  font-weight: 700;
  text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.7);
  transition: transform 0.3s ease;
}

.section:hover .overlay span {
  transform: scale(1.1);
}

/* Glowing Background Spots */
.glowing-spots {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}

.glowing-spots span {
  position: absolute;
  display: block;
  width: 30px;
  height: 30px;
  background: radial-gradient(circle, #806aed, transparent 70%);
  border-radius: 50%;
  animation: moveGlow 20s linear infinite;
  opacity: 0.5;
  filter: blur(8px);
}

@keyframes moveGlow {
  0% {
    transform: translateY(100vh) translateX(0) scale(0.5);
    opacity: 0.2;
  }
  50% {
    opacity: 0.8;
  }
  100% {
    transform: translateY(-100vh) translateX(50vw) scale(1);
    opacity: 0;
  }
}

/* Custom Cursor */
.cursor {
  position: fixed;
  top: 0;
  left: 0;
  width: 40px;
  height: 40px;
  margin-left: -20px;
  margin-top: -20px;
  border-radius: 50%;
  pointer-events: none;
  background: rgba(134, 110, 237, 0.6);
  box-shadow: 0 0 8px 4px rgba(134, 110, 237, 0.7);
  transition: transform 0.1s ease-out;
  mix-blend-mode: screen;
  z-index: 9999;
  transform: translate3d(0, 0, 0);
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 1rem;
  background-color: #1f1359;
  border-top: 2px solid #233554;
  color: #d0d0ff;
  font-size: 0.9rem;
  margin-top: auto;
}

/* Responsive Design */
@media (max-width: 900px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .section {
    height: 300px;
  }
}

@media (max-width: 768px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .section {
    height: 260px;
  }

  .overlay {
    background: rgba(0, 0, 0, 0.5);
  }

  .hamburger {
    display: block;
  }

  .nav-links {
    display: none; /* Optional: Add logic to toggle this */
    flex-direction: column;
    background: #0d47a1;
    padding: 1rem;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
  }

  .topic-card {
    width: 100%;
  }
}