:root {
    --background-color: #f0f2f5;
    --background-pattern-color: #d4d4d4;
    --container-bg-color: white;
    --text-color: #333;
    --h1-color: #1a1a1a;
    --button-bg-color: #4a90e2;
    --button-hover-bg-color: #5aa1f2;
    --button-shadow-color: rgba(74, 144, 226, 0.4);
    --button-hover-shadow-color: rgba(74, 144, 226, 0.6);
}

body.dark-mode {
    --background-color: #1a1a1a;
    --background-pattern-color: #444;
    --container-bg-color: #2c2c2c;
    --text-color: #f0f2f5;
    --h1-color: #f0f2f5;
    --button-bg-color: #5aa1f2;
    --button-hover-bg-color: #4a90e2;
    --button-shadow-color: rgba(74, 144, 226, 0.2);
    --button-hover-shadow-color: rgba(74, 144, 226, 0.4);
}

/* General Styles */
body {
    font-family: 'Helvetica Neue', sans-serif;
    background-color: var(--background-color);
    background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23d4d4d4' fill-opacity='0.1' fill-rule='evenodd'%3E%3Cpath d='M0 40L40 0H20L0 20M40 40V20L20 40'/%3E%3C/g%3E%3C/svg%3E");
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Theme Switch */
.theme-switch-wrapper {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #4a90e2;
}

input:checked + .slider:before {
    transform: translateX(26px);
}

/* Main Container */
.container {
    background-color: var(--container-bg-color);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1), 0 5px 10px rgba(0, 0, 0, 0.05);
    text-align: center;
    max-width: 500px;
    width: 90%;
    transition: background-color 0.3s ease;
}

h1 {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--h1-color);
    margin-bottom: 30px;
    transition: color 0.3s ease;
}

/* Generate Button */
#generate-btn {
    background-color: var(--button-bg-color);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--button-shadow-color);
}

#generate-btn:hover {
    transform: translateY(-3px);
    background-color: var(--button-hover-bg-color);
    box-shadow: 0 7px 20px var(--button-hover-shadow-color);
}

#generate-btn:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 10px var(--button-shadow-color);
}

/* Numbers Display */
#numbers-container {
    margin-top: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.menu-item {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--h1-color);
    padding: 20px 40px;
    border-radius: 15px;
    background-color: var(--background-color);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    animation: fade-in 0.5s ease-out forwards;
}

@keyframes fade-in {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    text-align: left;
}

.contact-form label {
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 5px;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea {
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: border-color 0.3s ease, background-color 0.3s ease;
}

.contact-form input[type="text"]:focus,
.contact-form input[type="email"]:focus,
.contact-form textarea:focus {
    border-color: #4a90e2;
    outline: none;
}

.contact-form textarea {
    resize: vertical;
    min-height: 100px;
}

.contact-form button[type="submit"] {
    background-color: #28a745; /* Green for submit */
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.4);
    margin-top: 20px;
}

.contact-form button[type="submit"]:hover {
    transform: translateY(-3px);
    background-color: #218838;
    box-shadow: 0 7px 20px rgba(40, 167, 69, 0.6);
}

.contact-form button[type="submit"]:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(40, 167, 69, 0.4);
}