:root {
    --bg-color: #f0f2f5;
    --text-color: #1c1e21;
    --container-bg-color: #ffffff;
    --container-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    --heading-color: #1c1e21;
    --number-text-color: #ffffff;
    --btn-bg-color: #1877f2; /* A more standard, vibrant blue */
    --btn-text-color: #ffffff;
    --btn-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --btn-hover-bg-color: #166fe5; /* A slightly darker blue for hover */
    --btn-hover-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
    --icon-btn-bg-color: #ffffff;
    --icon-btn-text-color: #4b4f56;
    --icon-btn-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --icon-btn-hover-bg-color: #f0f2f5;
    --icon-btn-hover-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

body.dark-mode {
    --bg-color: #1c1e21;
    --text-color: #e4e6eb;
    --container-bg-color: #242526;
    --container-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    --heading-color: #e4e6eb;
    --btn-bg-color: #28a745; /* A green button for dark mode for contrast */
    --btn-text-color: #ffffff;
    --btn-hover-bg-color: #218838;
    --icon-btn-bg-color: #3a3b3c;
    --icon-btn-text-color: #e4e6eb;
    --icon-btn-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    --icon-btn-hover-bg-color: #4e4f50;
    --icon-btn-hover-shadow: 0 6px 16px rgba(0, 0, 0, 0.35);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    flex-direction: column; /* Changed to column to stack content */
    justify-content: flex-start; /* Align content to the start of the column */
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px 0; /* Added vertical padding, removed horizontal padding for max-width containers */
    box-sizing: border-box; /* Ensures padding doesn't add to overall width */
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--container-bg-color);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--container-shadow);
    transition: background-color 0.3s, box-shadow 0.3s;
    width: 90%;
    max-width: 500px;
    margin-bottom: 20px; /* Added margin-bottom for spacing */
}

h1 {
    margin-top: 0;
    margin-bottom: 30px;
    font-size: 2.2em;
    color: var(--heading-color);
    font-weight: 600;
}

#theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background-color: var(--icon-btn-bg-color);
    color: var(--icon-btn-text-color);
    cursor: pointer;
    z-index: 1000;
    box-shadow: var(--icon-btn-shadow);
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

#theme-toggle:hover {
    background-color: var(--icon-btn-hover-bg-color);
    box-shadow: var(--icon-btn-hover-shadow);
    transform: translateY(-2px);
}

#theme-toggle .moon { display: none; }
#theme-toggle .sun { display: block; }

body.dark-mode #theme-toggle .moon { display: block; }
body.dark-mode #theme-toggle .sun { display: none; }

/* Language Switcher Styles */
.lang-switcher {
    position: fixed;
    top: 20px;
    right: 80px; /* Position next to the theme toggle */
    display: flex;
    z-index: 1000;
}

.lang-switcher button {
    background-color: var(--icon-btn-bg-color);
    color: var(--icon-btn-text-color);
    border: none;
    padding: 10px 0; /* Adjusted padding */
    font-size: 0.9em;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--icon-btn-shadow);
    font-weight: 600;
    width: 80px; /* Fixed width to prevent size change */
    text-align: center; /* Center the text */
}

.lang-switcher button:hover {
    background-color: var(--icon-btn-hover-bg-color);
    box-shadow: var(--icon-btn-hover-shadow);
    transform: translateY(-2px);
}

.numbers-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
}

.number {
    color: var(--number-text-color);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8em;
    font-weight: 700;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.number-1 { background-color: #ff6b6b; }
.number-2 { background-color: #f06595; }
.number-3 { background-color: #cc5de8; }
.number-4 { background-color: #845ef7; }
.number-5 { background-color: #5c7cfa; }
.number-6 { background-color: #339af0; }

#generate-btn {
    background-color: var(--btn-bg-color);
    color: var(--btn-text-color);
    border: none;
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--btn-shadow);
    font-weight: 600;
}

#generate-btn:hover {
    background-color: var(--btn-hover-bg-color);
    box-shadow: var(--btn-hover-shadow);
    transform: translateY(-2px);
}

/* Contact Form Styles */
.contact-form-container {
    background-color: var(--container-bg-color);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--container-shadow);
    transition: background-color 0.3s, box-shadow 0.3s;
    width: 90%;
    max-width: 500px;
    margin-top: 50px; /* Add some space between the two containers */
}

.contact-form-container h2 {
    margin-top: 0;
    margin-bottom: 30px;
    font-size: 1.8em;
    color: var(--heading-color);
    font-weight: 600;
}

.contact-form-container form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    text-align: left;
}

.contact-form-container label {
    font-size: 1em;
    color: var(--text-color);
    margin-bottom: 5px;
    font-weight: 500;
}

.contact-form-container input[type="text"],
.contact-form-container input[type="email"],
.contact-form-container textarea {
    padding: 12px 15px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 1em;
    background-color: var(--bg-color); /* Use a subtle background */
    color: var(--text-color);
    transition: border-color 0.3s, background-color 0.3s;
}

.contact-form-container input[type="text"]:focus,
.contact-form-container input[type="email"]:focus,
.contact-form-container textarea:focus {
    border-color: var(--btn-bg-color); /* Highlight on focus */
    outline: none;
}

.contact-form-container button[type="submit"] {
    background-color: var(--btn-bg-color);
    color: var(--btn-text-color);
    border: none;
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--btn-shadow);
    font-weight: 600;
    margin-top: 20px;
}

.contact-form-container button[type="submit"]:hover {
    background-color: var(--btn-hover-bg-color);
    box-shadow: var(--btn-hover-shadow);
    transform: translateY(-2px);
}

/* Language-specific display rules */
html:not(.lang-ko) [data-lang-display="ko"],
html.lang-ko [data-lang-display="en"] {
    display: none;
}