:root {
  --bg-color: #f0f8ff;
  --text-color: #333;
  --card-bg: #ffffffcc;
  --accent-color: #004080;
}

body.dark-mode {
  --bg-color: #1e1e1e;
  --text-color: #e0e0e0;
  --card-bg: #2c2c2c;
  --accent-color: #90caf9;
}

body {
  margin: 0;
  font-family: "Segoe UI", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 960px;
  margin: auto;
  padding: 20px;
}

.profile-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--card-bg);
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  margin-bottom: 20px;
}

.avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent-color);
}

.profile-info {
  flex: 1;
  margin-left: 20px;
}

.profile-info h1 {
  margin: 0;
  font-size: 28px;
  color: var(--accent-color);
}

#themeToggle {
  background-color: var(--accent-color);
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
}

.navbar {
  display: flex;
  justify-content: space-around;
  background-color: var(--accent-color);
  padding: 10px;
  border-radius: 8px;
  margin-bottom: 20px;
}

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

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

.card {
  background-color: var(--card-bg);
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  margin-bottom: 20px;
}

.card h2 {
  color: var(--accent-color);
  margin-top: 0;
}

.qr-section .qr-container {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
}

.qr-item {
  text-align: center;
  margin: 10px;
}

.qr-item img {
  width: 160px;
  height: 160px;
  border: 2px solid var(--accent-color);
  border-radius: 8px;
}