:root {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333333;
    --btn-bg: #007bff;
    --btn-hover: #0056b3;
    --number-bg: #f0f2f5;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --btn-bg: #4c8bf5;
    --btn-hover: #357ae8;
    --number-bg: #2d2d2d;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start; /* Change from center to flex-start */
    min-height: 100vh; /* Change from height to min-height */
    margin: 0;
    padding: 20px 0; /* Add some padding for top/bottom */
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 20px var(--shadow-color);
    text-align: center;
    position: relative;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
    width: 90%; /* Responsive width */
    max-width: 600px; /* Maximum container width */
}

.theme-toggle {
    position: absolute;
    top: 10px;
    right: 10px;
}

#theme-btn {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    transition: background-color 0.2s;
}

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

h1 {
    color: var(--text-color);
    margin-bottom: 20px;
}

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

.number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--number-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    color: var(--text-color);
    box-shadow: 0 2px 5px var(--shadow-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

#generate-btn {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s;
    box-shadow: 0 4px 10px var(--shadow-color);
}

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

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

.divider {
    border: 0;
    height: 1px;
    background: var(--number-bg);
    margin: 30px 0;
}

.contact-section {
    margin-top: 20px;
    text-align: left;
}

.contact-section h2 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-color);
    text-align: center;
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group label {
    font-size: 0.9rem;
    color: var(--text-color);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    padding: 10px;
    border: 1px solid var(--shadow-color);
    border-radius: 6px;
    background-color: var(--container-bg);
    color: var(--text-color);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.2s;
}

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

.submit-btn {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    padding: 12px;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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