:root {
    --background-color: #000010;
    --text-color: #fff;
    --container-bg-color: rgba(0, 0, 0, 0.5);
    --container-shadow-color: rgba(255, 255, 255, 0.2);
    --number-bg-color: rgba(255, 255, 255, 0.1);
    --number-shadow-color: rgba(255, 255, 255, 0.3);
    --btn-bg-color: #ff4081;
    --btn-hover-bg-color: #ff80ab;
    --btn-shadow-color: #ff4081;
    --btn-hover-shadow-color: #ff80ab;
    --text-shadow-color: #fff;
}

body[data-theme='light'] {
    --background-color: #f0f2f5;
    --text-color: #333;
    --container-bg-color: rgba(255, 255, 255, 0.8);
    --container-shadow-color: rgba(0, 0, 0, 0.1);
    --number-bg-color: rgba(0, 0, 0, 0.05);
    --number-shadow-color: rgba(0, 0, 0, 0.1);
    --btn-bg-color: #337ab7;
    --btn-hover-bg-color: #5a98d2;
    --btn-shadow-color: #337ab7;
    --btn-hover-shadow-color: #5a98d2;
    --text-shadow-color: #aaa;
}


body {
    margin: 0;
    font-family: 'NEXON Lv1 Gothic OTF';
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

.theme-switch-container {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 10;
}

#theme-switch-btn {
    background: var(--number-bg-color);
    color: var(--text-color);
    border: 1px solid var(--number-shadow-color);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
}

#theme-switch-btn:hover {
    background: var(--container-bg-color);
    box-shadow: 0 0 10px var(--container-shadow-color);
}


.space-background {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -1;
}

body[data-theme='light'] .space-background {
    display: none;
}

#stars, #stars2, #stars3 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
}

#stars {
    background-image: url('https://www.transparenttextures.com/patterns/stardust.png');
    animation: sparkle 60s linear infinite;
}

#stars2 {
    background-image: url('https://www.transparenttextures.com/patterns/stardust.png');
    animation: sparkle 90s linear infinite;
    animation-delay: -30s;
}

#stars3 {
    background-image: url('https://www.transparenttextures.com/patterns/stardust.png');
    animation: sparkle 120s linear infinite;
    animation-delay: -60s;
}

@keyframes sparkle {
    from {
        transform: translateY(0);
    }
    to {
        transform: translateY(-1000px);
    }
}

.lotto-container {
    text-align: center;
    background-color: var(--container-bg-color);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 0 20px var(--container-shadow-color);
    position: relative; 
    z-index: 1;
    transition: background-color 0.3s, box-shadow 0.3s;
}

h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 0 0 10px var(--text-shadow-color);
}

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

.lotto-number {
    width: 60px;
    height: 60px;
    background-color: var(--number-bg-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8rem;
    font-weight: bold;
    box-shadow: 0 0 10px var(--number-shadow-color);
    transition: all 0.3s ease;
}

#generate-btn {
    background-color: var(--btn-bg-color);
    color: #fff;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 0 15px var(--btn-shadow-color);
    transition: all 0.3s ease;
}

#generate-btn:hover {
    background-color: var(--btn-hover-bg-color);
    box-shadow: 0 0 25px var(--btn-hover-shadow-color);
}

@font-face {
    font-family: 'NEXON Lv1 Gothic OTF';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/noonfonts_20-04@2.1/NEXON Lv1 Gothic OTF.woff') format('woff');
    font-weight: normal;
    font-style: normal;
}