:root {
  --brand1: #007bff; /* Primary Blue for a fresh look */
  --brand2: #0056b3; /* Darker Blue */
  --accent: #28a745; /* Green for actions */
  --bg-light: #f5f7fa;
  --text-dark: #333;
  --text-light: #fff;
}
body {
  font-family: 'Noto Sans Bengali', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-light);
  color: var(--text-dark);
}

/* Navbar */
.navbar {
  background: linear-gradient(90deg, var(--brand1), var(--brand2));
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  padding: 0.8rem 0;
}
.navbar .navbar-brand {
  color: var(--text-light) !important;
  font-weight: 700;
  font-size: 1.5rem;
}
.navbar .nav-link {
  color: rgba(255, 255, 255, 0.8) !important;
  font-weight: 500;
  transition: all 0.3s;
}
.navbar .nav-link:hover {
  color: var(--text-light) !important;
  text-decoration: none;
}
.btn-auth {
  background-color: var(--text-light);
  color: var(--brand1);
  border: none;
  font-weight: 600;
  border-radius: 0.5rem;
  padding: 0.4rem 1rem;
  transition: background-color 0.3s, color 0.3s;
}
.btn-auth:hover {
  background-color: #e2e6ea;
  color: var(--brand2);
}

/* Slider Section */
#hero-slider {
  background: linear-gradient(135deg, var(--brand1), #6f42c1); /* Use different gradient */
  color: var(--text-light);
  padding: 4rem 0;
  border-radius: 0.75rem;
  margin-bottom: 2rem;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}
#hero-slider h1 {
  font-weight: 700;
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

/* Common Section Styling */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--brand2);
  margin-bottom: 2rem;
  border-bottom: 3px solid var(--accent);
  display: inline-block;
  padding-bottom: 5px;
}
.topic-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}
.section-card {
  border: none;
  border-radius: 0.75rem;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: transform 0.3s, box-shadow 0.3s;
  overflow: hidden;
}
.section-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}
.card-body {
  padding: 1.5rem;
}
.card-title {
  font-weight: 600;
  color: var(--brand1);
}

/* Notice Card Specific */
.notice-list .list-group-item {
  border: none;
  border-bottom: 1px solid #eee;
  padding: 0.75rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1rem;
  transition: background-color 0.3s;
}
.notice-list .list-group-item:hover {
  background-color: #f8f9fa;
}
.notice-badge {
  background-color: var(--accent);
  color: var(--text-light);
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.8rem;
}

/* Footer */
footer {
  margin-top: 50px;
  background: linear-gradient(90deg, var(--brand2), var(--brand1));
  color: var(--text-light);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.95rem;
}

/* Utility for Spacing */
.mb-40 { margin-bottom: 40px; }