/* Core Styling & Variables */
:root {
  --primary: #0F4C25;
  --dark: #1A202C;
  --light: #F8FAFC;
  --gray: #CBD5E0;
  --text: #4A5568;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  color: var(--dark);
  background-color: #ffffff;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Navigation */
nav {
  background-color: var(--dark);
  padding: 15px 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 15px;
  color: white;
  text-decoration: none;
}

.logo-container img {
  height: 45px;
  width: auto;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
}

.nav-links li a {
  color: white;
  text-decoration: none;
  font-weight: 600;
  text-transform: uppercase;
  font-size: 14px;
  transition: color 0.3s;
}

.nav-links li a:hover {
  color: #48BB78;
}

/* Main Content Area */
main {
  flex: 1;
  padding: 40px 5%;
}

/* Banners & Headers */
.page-header {
  background: linear-gradient(90deg, var(--primary) 0%, var(--dark) 100%);
  color: white;
  padding: 50px 5%;
  text-align: center;
}

.page-header h1 {
  margin: 0;
  font-size: 2.2rem;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.cert-banner {
  background-color: var(--light);
  border-top: 3px solid var(--primary);
  border-bottom: 3px solid var(--primary);
  text-align: center;
  padding: 15px;
  margin: 40px 0;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 1px;
  display: flex;
  justify-content: center;
  gap: 30px;
  flex-wrap: wrap;
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin: 30px 0;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

/* Cards & Images */
.card {
  background: var(--light);
  padding: 25px;
  border-radius: 8px;
  border-left: 5px solid var(--primary);
  box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.img-fluid {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-radius: 8px;
  border: 2px solid var(--gray);
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  min-width: 600px;
}

th {
  background-color: var(--primary);
  color: white;
  padding: 12px;
  text-align: left;
}

td {
  padding: 12px;
  border-bottom: 1px solid var(--gray);
}

tr:nth-child(even) {
  background-color: var(--light);
}

/* Footer */
footer {
  background-color: var(--dark);
  color: var(--gray);
  text-align: center;
  padding: 25px 5%;
  font-size: 14px;
  margin-top: auto;
}

footer strong {
  color: white;
}

.developer-credit {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 13px;
  color: #A0AEC0;
}

.developer-credit a {
  color: #48BB78;
  text-decoration: none;
  font-weight: 700;
}

.developer-credit a:hover {
  text-decoration: underline;
}

/* Responsive Mobile Adjustments */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: 15px;
    padding: 15px 2%;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px 18px;
  }

  .nav-links li a {
    font-size: 13px;
  }

  .page-header {
    padding: 35px 5%;
  }

  .page-header h1 {
    font-size: 1.6rem;
  }

  .cert-banner {
    flex-direction: column;
    gap: 10px;
  }

  .cert-banner span:nth-child(2) {
    display: none;
  }

  main {
    padding: 25px 4%;
  }
}