:root {
  --school-primary: #1565c0; /* Deep Blue */
  --school-secondary: #ffc107; /* Gold/Amber */
  --school-bg: #f8f9fa;
  --school-text: #333333;
  --school-white: #ffffff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Noto Sans Bengali', sans-serif;
}

body {
  background-color: var(--school-bg);
  color: var(--school-text);
  line-height: 1.6;
}

.school-header {
  background: var(--school-white);
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  padding: 10px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 15px;
}

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

.school-logo {
  font-size: 20px;
  font-weight: bold;
  color: var(--school-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-links {
  display: flex;
  gap: 25px;
}

.nav-links a {
  text-decoration: none;
  color: var(--school-text);
  font-weight: 600;
  transition: color 0.3s;
}

.nav-links a:hover {
  color: var(--school-primary);
}

@media (max-width: 768px) {
  .header-content { flex-direction: column; gap: 15px; text-align: center; }
  .nav-links { gap: 15px; font-size: 14px; }
  .school-logo { font-size: 18px; }
}

.btn-portal {
  background: var(--school-primary);
  color: white !important;
  padding: 10px 20px;
  border-radius: 5px;
}

.hero-section {
  background: linear-gradient(135deg, var(--school-primary), #0d47a1);
  color: white;
  padding: 100px 0;
  text-align: center;
}

.hero-section h1 {
  font-size: 42px;
  margin-bottom: 20px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin: -50px 0 50px;
}

@media (max-width: 992px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-section h1 { font-size: 32px; }
}

@media (max-width: 576px) {
  .feature-grid { grid-template-columns: 1fr; margin-top: 20px; }
  .hero-section { padding: 60px 0; }
  .hero-section h1 { font-size: 28px; }
}

.feature-card {
  background: white;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
  text-align: center;
  transition: transform 0.3s;
}

.feature-card:hover {
  transform: translateY(-10px);
}

.feature-card i {
  font-size: 40px;
  color: var(--school-primary);
  margin-bottom: 20px;
}

.footer-school {
  background: #1a1a1a;
  color: white;
  padding: 60px 0 20px;
}