@import url('https://fonts.googleapis.com/css2?family=Nanum+Gothic:wght@400;700;800&display=swap');

:root {
    --primary-color: #4a90e2;
    --secondary-color: #f5a623;
    --background-color: #f0f2f5;
    --text-color: #333;
    --white-color: #fff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --footer-color: #999;
    --header-p-color: #777;
}

[data-theme="dark"] {
    --primary-color: #64b5f6;
    --secondary-color: #ffb74d;
    --background-color: #1a1a1a;
    --text-color: #e0e0e0;
    --white-color: #2d2d2d;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --footer-color: #888;
    --header-p-color: #bbb;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

.container {
    background-color: var(--white-color);
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    padding: 40px;
    text-align: center;
    width: 90%;
    max-width: 600px;
    transition: transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
    transition: color 0.3s ease;
}

.container:hover {
    transform: translateY(-5px);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 10px;
}

header h1 .fa-dice {
    margin-right: 10px;
    animation: spin 2s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

header p {
    font-size: 1.1rem;
    color: var(--header-p-color);
    margin-bottom: 30px;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.lotto-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--secondary-color);
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.8rem;
    font-weight: 700;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    transform-style: preserve-3d;
}

.lotto-number:hover {
    transform: scale(1.1) rotateY(180deg);
}

#generate-btn {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 30px;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(74, 144, 226, 0.4);
}

#generate-btn .fa-sync-alt {
    margin-right: 10px;
}

#generate-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(74, 144, 226, 0.6);
}

footer {
    margin-top: 40px;
    font-size: 0.9rem;
    color: var(--footer-color);
}

@media (max-width: 480px) {
    .container {
        padding: 20px;
    }

    header h1 {
        font-size: 2rem;
    }

    .lotto-number {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }

    #generate-btn {
        padding: 12px 25px;
        font-size: 1rem;
    }
}