body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  background-color: #f4f6f8;
  color: #333;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  background-color: #1976d2;
  color: white;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header h1 {
  margin: 0;
  font-size: 24px;
}

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

table {
  width: 90%;
  margin: 30px auto;
  border-collapse: collapse;
  background: white;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

th, td {
  padding: 15px;
  text-align: center;
}

th {
  background-color: #1976d2;
  color: white;
}

tr:nth-child(even) {
  background-color: #f4f6f8;
}

a.button {
  padding: 6px 12px;
  background-color: #1976d2;
  color: white;
  border-radius: 4px;
  text-decoration: none;
  font-weight: bold;
}

a.button:hover {
  background-color: #0f4c91;
}

.login-box {
  width: 350px;
  margin: 100px auto;
  padding: 30px;
  background: white;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  text-align: center;
}

.login-box input {
  width: 80%;
  padding: 10px;
  margin: 10px 0;
  border-radius: 5px;
  border: 1px solid #ccc;
}

.login-box button {
  padding: 10px 20px;
  background-color: #1976d2;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-weight: bold;
}

.login-box button:hover {
  background-color: #0f4c91;
}

.user-card {
  width: 400px;
  margin: 50px auto;
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 5px 20px rgba(0,0,0,0.1);
  text-align: center;
}

.user-profile img {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 15px;
  border: 2px solid #1976d2;
}

.user-profile .avatar-placeholder {
  width: 100px;
  height: 100px;
  line-height: 100px;
  border-radius: 50%;
  background: #ddd;
  color: #666;
  margin: 0 auto 15px;
}

.user-card h2 {
  margin-bottom: 25px;
  font-size: 22px;
  color: #1976d2;
}

.user-card label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
  text-align: left;
}

.user-card input {
  width: 100%;
  padding: 10px;
  margin-bottom: 20px;
  border-radius: 6px;
  border: 1px solid #ccc;
  box-sizing: border-box;
}

.user-card button {
  padding: 12px 25px;
  background-color: #1976d2;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  transition: background 0.3s;
}

.user-card button:hover {
  background-color: #0f4c91;
}

.delete-button {
  margin-top: 10px;
  padding: 10px 20px;
  background-color: #e53935 !important;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-weight: bold;
}

.delete-button:hover {
  background-color: #b71c1c;
}