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

:root {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333333;
    --primary-color: #4a90e2;
    --primary-hover-color: #357abd;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --ball-size: 50px;
}

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

body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    text-align: center;
    max-width: 500px;
    width: 100%;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(45deg, #6a11cb, #2575fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 30px;
}

.lotto-numbers-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    min-height: calc(var(--ball-size) + 10px);
    margin-bottom: 40px;
}

.lotto-ball {
    width: var(--ball-size);
    height: var(--ball-size);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    animation: pop-in 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55) forwards;
    transform: scale(0);
}

@keyframes pop-in {
    to {
        transform: scale(1);
    }
}

.generate-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 50px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.4);
}

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

.generate-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(74, 144, 226, 0.3);
}

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

    header h1 {
        font-size: 2rem;
    }

    header p {
        font-size: 1rem;
    }

    :root {
        --ball-size: 40px;
    }

    .lotto-ball {
        font-size: 1.2rem;
    }
}