* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: #f5f7fa;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.login-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 2.5rem;
    width: 100%;
    max-width: 400px;
    border: 1px solid #e1e5e9;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    width: 50px;
    height: 50px;
    background-color: #4a90e2;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #7f8c8d;
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #34495e;
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    padding: 0.875rem;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    background-color: #fff;
    transition: border-color 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #4a90e2;
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.1);
}

.btn-login {
    width: 100%;
    padding: 0.875rem;
    background-color: #4a90e2;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.btn-login:hover {
    background-color: #357abd;
}

.btn-login:active {
    background-color: #2c5aa0;
}

.btn-login:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
}

.message {
    padding: 0.875rem;
    border-radius: 6px;
    margin-top: 1rem;
    font-size: 0.9rem;
}

.error-message {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    color: #dc2626;
}

.success-message {
    background-color: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #059669;
}

.info-box {
    margin-top: 2rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 6px;
    text-align: center;
}

.info-box h4 {
    color: #495057;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.info-box p {
    color: #6c757d;
    font-size: 0.8rem;
    line-height: 1.4;
}

/* Loading State */
.btn-login.loading {
    color: transparent;
    position: relative;
}

.btn-login.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 480px) {
    .login-container {
        padding: 2rem 1.5rem;
    }

    .title {
        font-size: 1.3rem;
    }
}