:root {
    --bg-color: #f0f2f5;
    --container-bg: #fff;
    --text-color: #333;
    --row-bg: #f9f9f9;
    --row-text: #555;
    --btn-bg: #4CAF50;
    --btn-hover: #45a049;
    --shadow-color: rgba(31, 38, 135, 0.37);
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #e0e0e0;
    --row-bg: #3d3d3d;
    --row-text: #ccc;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

body {
    font-family: sans-serif;
    background-color: var(--bg-color);
    background-image: url("data:image/svg+xml,%3Csvg width='6' height='6' viewBox='0 0 6 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%239C92AC' fill-opacity='0.1'%3E%3Cpath d='M5 0h1L0 6V5zM6 5v1H5z'/%3E%3C/g%3E%3C/svg%3E");
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s ease;
}

.container {
    background-color: var(--container-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 8px 32px 0 var(--shadow-color);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.theme-toggle {
    text-align: right;
    margin-bottom: 1rem;
}

#theme-btn {
    background: none;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

#theme-btn:hover {
    background-color: var(--text-color);
    color: var(--container-bg);
}

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

.lotto-numbers-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.lotto-row {
    font-size: 1.2rem;
    color: var(--row-text);
    background-color: var(--row-bg);
    padding: 0.8rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#generate-btn {
    background-color: var(--btn-bg);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: background-color 0.3s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

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

.contact-section {
    margin-top: 2rem;
    padding-top: 1rem;
}

.contact-section hr {
    border: 0;
    border-top: 1px solid var(--text-color);
    opacity: 0.2;
    margin-bottom: 1.5rem;
}

.contact-section h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
}

#contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--shadow-color);
    border-radius: 8px;
    background-color: var(--row-bg);
    color: var(--text-color);
    box-sizing: border-box;
    font-size: 1rem;
}

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

#submit-btn {
    background-color: #3498db;
    color: white;
    padding: 0.8rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s ease;
}

#submit-btn:hover {
    background-color: #2980b9;
}