body, html {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

@media (min-width: 769px) {
    body, html {
        max-width: 900px;
        margin: 0 auto;
    }
}

.login-container {
    width: 100%;
    max-width: 420px;
    background: #ffffff;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 2.5rem;
    text-align: center;
    animation: slideUp 0.4s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-container h1 {
    margin-bottom: 1.5rem;
    color: #1e3c72;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.login-container h3 {
    margin-bottom: 2rem;
    color: #2a5298;
    font-size: 1.25rem;
    font-weight: 600;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: #2d3748;
    font-size: 0.95rem;
}

.form-group input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.2s ease;
    box-sizing: border-box;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.error-message {
    color: #dc2626;
    background-color: #fef2f2;
    border: 2px solid #fecaca;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    font-size: 0.9rem;
    margin: -0.5rem 0 0.5rem 0;
    text-align: left;
}

.btn-login {
    width: 100%;
    padding: 0.875rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
    margin-top: 0.5rem;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-login:active {
    transform: translateY(0);
}

footer {
    margin-top: 1.5rem;
    color: #2d3748;
    font-size: 0.85rem;
    padding-top: 1rem;
    border-top: 1px solid #e2e8f0;
}

footer p {
    margin: 0.5rem 0;
    line-height: 1.6;
}

footer a {
    color: #667eea;
    text-decoration: underline;
    transition: all 0.2s ease;
    font-weight: 500;
}

footer a:hover {
    color: #764ba2;
    text-decoration: none;
}

@media (max-width: 768px) {
    body, html {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    body, html {
        max-width: 100%;
    }

    .login-container {
        padding: 2rem 1.5rem;
        border-radius: 16px;
    }

    .login-container h1 {
        font-size: 1.75rem;
    }

    .login-container h3 {
        font-size: 1.125rem;
    }

    .form-group input {
        padding: 0.75rem;
        font-size: 0.95rem;
    }

    .btn-login {
        padding: 0.75rem;
        font-size: 0.95rem;
    }
}