:root {
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --text-color: #333333;
    --btn-bg: #4CAF50;
    --btn-hover: #45a049;
    --btn-shadow: rgba(76, 175, 80, 0.4);
    --card-shadow: rgba(0, 0, 0, 0.1);
    --input-bg: #f9f9f9;
    --input-border: #ddd;
    --divider: #eee;
}

.dark-mode {
    --bg-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-color: #f0f0f0;
    --btn-bg: #2e7d32;
    --btn-hover: #1b5e20;
    --btn-shadow: rgba(0, 0, 0, 0.5);
    --card-shadow: rgba(0, 0, 0, 0.6);
    --input-bg: #3d3d3d;
    --input-border: #555;
    --divider: #444;
}

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

#app {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 30px var(--card-shadow);
    text-align: center;
    width: 100%;
    max-width: 400px;
    position: relative;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.theme-toggle {
    position: absolute;
    top: 15px;
    right: 15px;
}

#theme-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    transition: transform 0.2s ease;
}

#theme-btn:hover {
    transform: scale(1.1);
}

h1 {
    color: var(--text-color);
    margin-bottom: 24px;
    font-size: 24px;
}

#generate-btn {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    padding: 12px 24px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--btn-shadow);
    width: 100%;
}

#generate-btn:hover {
    background-color: var(--btn-hover);
    box-shadow: 0 6px 20px var(--btn-shadow);
    transform: translateY(-2px);
}

#numbers-display {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin: 20px 0;
    min-height: 60px;
}

.number-ball {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: #f1c40f;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 18px;
    font-weight: bold;
    margin: 5px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    animation: pop-in 0.5s ease-out forwards;
}

.divider {
    border: 0;
    border-top: 1px solid var(--divider);
    margin: 30px 0;
}

.contact-section h2, .comments-section h2 {
    font-size: 20px;
    margin-bottom: 20px;
}

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

.form-group {
    margin-bottom: 15px;
}

input, textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    background-color: var(--input-bg);
    color: var(--text-color);
    box-sizing: border-box;
    font-family: inherit;
    font-size: 14px;
}

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

#submit-btn {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
    font-size: 16px;
    transition: background-color 0.3s;
}

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

@keyframes pop-in {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    60% {
        transform: scale(1.1);
        opacity: 1;
    }
    100% {
        transform: scale(1);
    }
}