body {
    font-family: 'Roboto', sans-serif;
    background-color: #333;
    color: #f8f9fa;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    padding: 20px;
    overflow: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

form {
    opacity: 0;
    transform: translateY(-50px);
    transition: opacity 1s ease, transform 1s ease, background-color 0.3s ease, color 0.3s ease;
    background-color: #444;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

form.loaded {
    opacity: 1;
    transform: translateY(0);
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
}

input[type="text"].error, input[type="email"].error {
    border-color: red;
}

input[type="text"], input[type="email"] {
    width: 100%;
    padding: 10px;
    margin-bottom: 20px;
    border: 1px solid #666;
    border-radius: 4px;
    font-size: 16px;
    transition: background-color 0.3s ease, color 0.3s ease;
    color: #f8f9fa;
    background-color: #555;
}

input[type="submit"] {
    display: block;
    width: 100%;
    padding: 10px;
    background: linear-gradient(135deg, #004a8f 0%, #0062bf 100%);
    background-size: 200% 200%;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-position 0.3s ease, color 0.3s ease;
    position: relative;
    z-index: 1;
}

:not(.dark-mode) input[type="submit"]:hover {
    background-position: 100% 0;
}

input[type="submit"]:active {
    filter: brightness(0.9);
}

.feedback {
    margin-top: 20px;
    font-size: 16px;
    opacity: 0;
    transition: opacity 0.5s ease, background-color 0.3s ease, color 0.3s ease;
}

.feedback.visible {
    opacity: 1;
}

.ripple-container {
    position: relative;
    overflow: hidden;
}

.ripple-container span {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.7);
    transform: scale(0);
    animation: ripple 1s linear;
    pointer-events: none;
}

/* Light Mode Styles */
body.dark-mode {
    background-color: #f8f9fa;
    color: #333;
}

body.dark-mode form,
body.dark-mode input[type="text"], 
body.dark-mode input[type="email"], 
body.dark-mode .feedback {
    background-color: #fff;
    color: #333;
    border-color: #ccc;
}

body.dark-mode input[type="submit"] {
    background-color: #007bff;
    color: #fff;
}