:root {
    --bg-color: #f0f2f5;
    --container-bg: white;
    --text-color: #333;
    --btn-bg: #007bff;
    --btn-hover: #0056b3;
    --number-bg: #f8f9fa;
    --number-border: #dee2e6;
    --number-text: #495057;
    --shadow: rgba(0,0,0,0.1);
}

body.dark-mode {
    --bg-color: #18191a;
    --container-bg: #242526;
    --text-color: #e4e6eb;
    --btn-bg: #3a3b3c;
    --btn-hover: #4e4f50;
    --number-bg: #3a3b3c;
    --number-border: #4e4f50;
    --number-text: #e4e6eb;
    --shadow: rgba(0,0,0,0.3);
}

body {
    font-family: 'Helvetica Neue', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    transition: background-color 0.3s;
    padding: 40px 20px;
    box-sizing: border-box;
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 20px var(--shadow);
    transition: background-color 0.3s, box-shadow 0.3s;
    width: 100%;
    max-width: 600px;
}

h1 {
    margin-bottom: 30px;
    color: var(--text-color);
}

#generate {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    margin-bottom: 30px;
}

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

#generate:active {
    transform: scale(0.98);
}

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

.number {
    width: 50px;
    height: 50px;
    background-color: var(--number-bg);
    border: 1px solid var(--number-border);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 22px;
    font-weight: bold;
    color: var(--number-text);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

#theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 10px 15px;
    border-radius: 5px;
    border: 1px solid var(--number-border);
    background-color: var(--container-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s;
}

.form-container {
    margin-top: 30px;
    border-top: 1px solid var(--number-border);
    padding-top: 30px;
}

.form-container h2 {
    color: var(--text-color);
    margin-bottom: 20px;
    font-size: 24px;
}

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

.form-container input, 
.form-container textarea {
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--number-border);
    background-color: var(--number-bg);
    color: var(--text-color);
    font-size: 16px;
    transition: all 0.3s;
}

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

.form-container input:focus, 
.form-container textarea:focus {
    outline: none;
    border-color: var(--btn-bg);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.2);
}

.form-container button {
    background-color: #28a745;
    color: white;
    border: none;
    padding: 12px;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.form-container button:hover {
    background-color: #218838;
}

#disqus_container {
    margin-top: 50px;
    border-top: 1px solid var(--number-border);
    padding-top: 30px;
    text-align: left;
}