html, body {
  height: 100%;
  width: 100%;
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background: #fff;
  color: #333;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Header and Navigation */
header {
  background: #4b8be0;
  color: #fff;
  text-align: center;
  padding: 1.5em 0;
  width: 100%;
}

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

.navbar li { margin: 0 15px; }

.navbar a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

.navbar a.active, .navbar a:hover {
  text-decoration: underline;
}

/* Main Layout */
main {
  flex: 1;
  width: 100%;
  margin: 0;
  padding: 2em;
  background: #fff;
  box-sizing: border-box;
}

/* Home Page Hero Section */
.intro {
  background: linear-gradient(to right, #004aad, #348dfa);
  color: white;
  padding: 4em 2em;
  text-align: center;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.profile-img {
  display: block;
  margin: 0 auto 2em;
  max-width: 160px;
  border-radius: 50%;
  border: 3px solid white;
  
  
}

/* Buttons */
.btn {
  display: inline-block;
  background: white;
  color: #004aad;
  padding: 10px 20px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  margin-top: 1em;
}
.btn:hover { background: #e5e5e5; }

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
}
th, td {
  padding: 10px;
  border: 1px solid #ddd;
  text-align: left;
}
th {
  background-color: #4b8be0;
  color: white;
}

/* Footer */
footer {
  background: #4b8be0;
  color: white;
  text-align: center;
  padding: 1em 0;
  width: 100%;
  margin-top: auto;
}