body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}
.container {
    width: 100%;
    max-width: 450px;
    background: #fff;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    min-height: 100vh;
}
header {
    background-color: #fff;
    padding: 20px;
    text-align: center;
    border-bottom: 3px solid #ffcc00;
}
header img {
    max-width: 150px;
}
.content {
    padding: 20px;
}
.alert {
    background-color: #fff3cd;
    color: #856404;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
    border: 1px solid #ffeeba;
    font-size: 14px;
}
h2 {
    color: #003366;
    font-size: 18px;
    margin-bottom: 15px;
}
.form-group {
    margin-bottom: 15px;
}
label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    font-size: 14px;
}
input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 16px;
}
.btn-primary {
    background-color: #003366;
    color: #fff;
    border: none;
    padding: 15px;
    width: 100%;
    border-radius: 4px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    margin-top: 10px;
}
.footer {
    text-align: center;
    padding: 20px;
    font-size: 12px;
    color: #666;
}
.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #003366;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 2s linear infinite;
    margin: 20px auto;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}