:root {
    --bg-color: #f0f2f5;
    --text-color: #333;
    --btn-bg: #4a90e2;
    --btn-hover: #357abd;
    --btn-active: #2a628f;
    --lotto-bg: #f5a623;
    --shadow: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #1a1a2e;
    --text-color: #eaeaea;
    --btn-bg: #5a67d8;
    --btn-hover: #4c51bf;
    --btn-active: #434190;
    --lotto-bg: #ed8936;
    --shadow: rgba(0, 0, 0, 0.3);
}

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

#theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background-color: var(--btn-bg);
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 6px var(--shadow);
    transition: background-color 0.3s ease, transform 0.2s ease;
    z-index: 1000;
}

#theme-toggle:hover {
    background-color: var(--btn-hover);
    transform: scale(1.1);
}

main {
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: 2rem;
    transition: color 0.3s ease;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

#generate-btn {
    padding: 1rem 2rem;
    font-size: 1.2rem;
    color: #fff;
    background-color: var(--btn-bg);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 4px 6px var(--shadow);
    transition: background-color 0.3s ease, transform 0.2s ease;
}

#generate-btn:hover {
    background-color: var(--btn-hover);
    transform: translateY(-2px);
}

#generate-btn:active {
    background-color: var(--btn-active);
    transform: translateY(0);
}

lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.lotto-number {
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: #fff;
    background-color: #f5a623;
    border-radius: 50%;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}