:root {
    --background-color: #f0f2f5;
    --container-bg-color: #ffffff;
    --text-color: #333;
    --button-bg-color: #4CAF50;
    --button-text-color: white;
    --number-ball-bg-color: #f8f9fa;
    --number-ball-border-color: #dee2e6;
}

.dark-mode {
    --background-color: #1a1a1a;
    --container-bg-color: #2c2c2c;
    --text-color: #f0f2f5;
    --button-bg-color: #5a5a5a;
    --button-text-color: #f0f2f5;
    --number-ball-bg-color: #3a3a3a;
    --number-ball-border-color: #5a5a5a;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    text-align: center;
    background-color: var(--container-bg-color);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s;
}

h1 {
    margin-bottom: 30px;
    font-size: 2.5em;
    color: var(--text-color);
}

.numbers-container {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
}

.number-ball {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--number-ball-bg-color);
    border: 1px solid var(--number-ball-border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8em;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
    transition: background-color 0.3s, border-color 0.3s;
}

#generate-btn, #inquiry-btn {
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
    border: none;
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    margin: 5px;
}

#generate-btn:hover, #inquiry-btn:hover {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

/* Theme Switch */
.theme-switch-container {
    position: absolute;
    top: 20px;
    right: 20px;
}

.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;
}

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

input:checked + .slider {
    background-color: #2196F3;
}

input:focus + .slider {
    box-shadow: 0 0 1px #2196F3;
}

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

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

/* Inquiry Form */
#inquiry-form-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
}

#inquiry-form {
    background-color: var(--container-bg-color);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    width: 400px;
    max-width: 90%;
}

#inquiry-form h2 {
    margin-top: 0;
}

#inquiry-form label {
    display: block;
    margin-bottom: 5px;
    text-align: left;
}

#inquiry-form input, #inquiry-form textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 20px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

#inquiry-form button {
    background-color: var(--button-bg-color);
    color: var(--button-text-color);
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin-right: 10px;
}

.hidden {
    display: none !important;
}