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

:root {
    --bg-gradient-start: #6a11cb;
    --bg-gradient-end: #2575fc;
    --text-color: white;
    --container-bg: rgba(255, 255, 255, 0.1);
    --number-bg: #fff;
    --number-text: #333;
    --button-bg: #ff4081;
    --button-hover-bg: #f50057;
    --button-shadow: #ff4081;
}

body {
    font-family: 'Nanum Gothic', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(to right, var(--bg-gradient-start), var(--bg-gradient-end));
    color: var(--text-color);
    transition: background 0.5s, color 0.5s;
}

body.dark-mode {
    --bg-gradient-start: #232323;
    --bg-gradient-end: #4a4a4a;
    --text-color: #f1f1f1;
    --container-bg: rgba(0, 0, 0, 0.2);
    --number-bg: #333;
    --number-text: #f1f1f1;
    --button-bg: #bb86fc;
    --button-hover-bg: #a16af5;
    --button-shadow: #bb86fc;
}

.container {
    text-align: center;
    background: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
}

h1 {
    margin-bottom: 30px;
}

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

.number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--number-bg);
    color: var(--number-text);
    border: 3px solid var(--number-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 28px;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, background-color 0.5s, color 0.5s;
    animation: appear 0.5s ease-in-out forwards;
}

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

button {
    background: var(--button-bg);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    border-radius: 50px;
    cursor: pointer;
    transition: background 0.3s, box-shadow 0.3s;
    box-shadow: 0 0 10px var(--button-shadow), 0 0 20px var(--button-shadow), 0 0 30px var(--button-shadow);
    margin-top: 10px;
}

button:hover {
    background: var(--button-hover-bg);
    box-shadow: 0 0 15px var(--button-shadow), 0 0 30px var(--button-shadow), 0 0 45px var(--button-shadow);
}

#theme-toggle {
    background: var(--button-bg);
    box-shadow: 0 0 10px var(--button-shadow), 0 0 20px var(--button-shadow), 0 0 30px var(--button-shadow);
}


@keyframes appear {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}