body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    position: relative;
    overflow: hidden;
}
body::before {
    content: '';
    position: fixed;
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 950px;
    height: 950px;
    background-image: url('/images/white_logo.png');
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    opacity: 0.1;
    filter: blur(7px);
    pointer-events: none;
    z-index: 0;
}
.login-container {
    background-color: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
    width: 100%;
    max-width: 400px;
    position: relative;
    z-index: 1;
}
.header {
    text-align: center;
    margin-bottom: 2rem;
}
.header h1 {
    color: #1e3c72;
    margin-bottom: 0.5rem;
    font-weight: 700;
    font-size: 2.2rem;
}
.header p {
    color: #666;
    font-size: 1.1rem;
}
.form-group {
    margin-bottom: 1rem;
}
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #374151;
}
.form-group input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #d1d5db;
    border-radius: 4px;
    box-sizing: border-box;
}
.login-btn {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: opacity 0.2s ease;
}
.login-btn:hover {
    opacity: 0.9;
}
.error-message {
    color: #dc2626;
    margin-top: 1rem;
    text-align: center;
    display: none;
}
.success-message {
    color: #34c759;
    margin-top: 1rem;
    text-align: center;
    display: none;
}
.register-link {
    text-align: center;
    margin-top: 1rem;
}
.register-link a {
    color: #2563eb;
    text-decoration: none;
}
.register-link a:hover {
    text-decoration: underline;
}