:root {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333333;
    --ball-bg: #ffc107;
    --ball-text: #333333;
    --btn-bg: #007bff;
    --btn-hover-bg: #0056b3;
    --btn-shadow: rgba(0, 123, 255, 0.4);
    --btn-shadow-hover: rgba(0, 123, 255, 0.5);
    --container-shadow: rgba(0, 0, 0, 0.1);
    --number-shadow: rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] {
    --bg-color: #11151f;
    --container-bg: #1b2231;
    --text-color: #f0f3f8;
    --ball-bg: #f7c948;
    --ball-text: #1b2231;
    --btn-bg: #3b82f6;
    --btn-hover-bg: #2563eb;
    --btn-shadow: rgba(59, 130, 246, 0.35);
    --btn-shadow-hover: rgba(59, 130, 246, 0.5);
    --container-shadow: rgba(0, 0, 0, 0.4);
    --number-shadow: rgba(0, 0, 0, 0.35);
}

body {
    font-family: 'Helvetica Neue', sans-serif;
    background-color: var(--bg-color);
    background-image: url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"%3E%3Cfilter id="noise"%3E%3CfeTurbulence type="fractalNoise" baseFrequency="0.8" numOctaves="4" stitchTiles="stitch"/%3E%3C/filter%3E%3Crect width="100%25" height="100%25" filter="url(%23noise)" opacity="0.05"/%3E%3C/svg%3E');
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--container-shadow);
    color: var(--text-color);
}

.theme-toggle-wrap {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 10px;
}

#theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    border-radius: 999px;
    padding: 8px 14px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: opacity 0.2s ease;
}

#theme-toggle-btn:hover {
    opacity: 0.8;
}

h1 {
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: 30px;
}

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

.lotto-number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--ball-bg);
    color: var(--ball-text);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    box-shadow: 0 4px 15px var(--number-shadow);
}

#generate-btn {
    background-color: var(--btn-bg);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--btn-shadow);
}

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