:root {
    --bg-color: #f0f2f5;
    --container-bg: #fff;
    --text-color: #333;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --btn-bg: #50e3c2;
    --btn-hover: #48d1b7;
    --btn-text: #fff;
    --toggle-btn-bg: #f0f2f5;
    --toggle-btn-hover: #e4e6eb;
    --input-bg: #fff;
    --input-border: #ddd;
    --hr-color: #eee;
}

[data-theme="dark"] {
    --bg-color: #18191a;
    --container-bg: #242526;
    --text-color: #e4e6eb;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --btn-bg: #2d88ff;
    --btn-hover: #1b74e4;
    --btn-text: #fff;
    --toggle-btn-bg: #3a3b3c;
    --toggle-btn-hover: #4e4f50;
    --input-bg: #3a3b3c;
    --input-border: #4e4f50;
    --hr-color: #3e4042;
}

body {
    font-family: 'Helvetica Neue', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    position: relative;
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 20px var(--shadow-color);
    transition: background-color 0.3s, box-shadow 0.3s;
    width: 90%;
    max-width: 500px;
    margin: 20px;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background-color: var(--toggle-btn-bg);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    font-size: 20px;
    transition: background-color 0.3s, transform 0.2s;
}

.theme-toggle:hover {
    background-color: var(--toggle-btn-hover);
    transform: scale(1.1);
}

.theme-toggle:active {
    transform: scale(0.9);
}

h1 {
    color: var(--text-color);
    margin-bottom: 30px;
    font-size: 2rem;
}

.lotto-machine {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.number-display {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

.number-display span {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.2rem;
    font-weight: bold;
    color: #fff;
    background-color: #4a90e2; /* Default color */
    animation: pop-in 0.5s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.generate-btn {
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    padding: 15px 30px;
    font-size: 1.1rem;
    font-weight: bold;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    box-shadow: 0 4px 6px var(--shadow-color);
}

.generate-btn:hover {
    background-color: var(--btn-hover);
}

.generate-btn:active {
    transform: scale(0.95);
}

.partnership-section {
    margin-top: 40px;
    text-align: left;
}

.partnership-section hr {
    border: 0;
    border-top: 1px solid var(--hr-color);
    margin-bottom: 30px;
}

.partnership-section h3 {
    text-align: center;
    margin-bottom: 20px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--btn-bg);
}

.form-group textarea {
    height: 100px;
    resize: none;
}

.submit-btn {
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    padding: 12px;
    font-size: 1rem;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

.submit-btn:hover {
    background-color: var(--btn-hover);
}

.submit-btn:active {
    transform: scale(0.98);
}

@keyframes pop-in {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    60% {
        transform: scale(1.1);
        opacity: 1;
    }
    100% {
        transform: scale(1);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 20px;
    }
    h1 {
        font-size: 1.5rem;
        margin-top: 40px;
    }
    .number-display span {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}