:root {
    --bg-color: #121212;
    --nav-bg: #1a1a1a;
    --card-bg: #1e1e1e;
    --border-color: #2d2d2d;
    --text-main: #e0e0e0;
    --text-muted: #a0a0a0;
    --text-white: #ffffff;
    --accent-color: #3498db;
    --shadow: rgba(0, 0, 0, 0.35);
    --radius: 8px;
}
@media (prefers-color-scheme: light) {
    :root {
        --bg-color: #f5f5f7;
        --nav-bg: #ffffff;
        --card-bg: #ffffff;
        --border-color: #e5e5ea;
        --text-main: #1d1d1f;
        --text-muted: #6e6e73;
        --text-white: #000000;
        --accent-color: #0071e3;
        --shadow: rgba(0, 0, 0, 0.06);
    }
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    transition: background-color 0.3s ease, color 0.3s ease;
}
.background {
    display: none;
}
.notice-box {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: 0 4px 12px var(--shadow);
    max-width: 600px;
    width: 100%;
    text-align: center;
}
.notice-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 2rem;
}
.language-buttons {
    display: flex;
    justify-content: center;
    gap: 2rem;
}
.language-button {
    flex: 1;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    cursor: pointer;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-white);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.language-button:hover {
    transform: translateY(-4px);
    border-color: var(--accent-color);
    box-shadow: 0 8px 20px var(--shadow);
}
@media (max-width: 768px) {
    .notice-box {
        padding: 1.5rem;
    }
    .language-buttons {
        flex-direction: column;
        gap: 1.5rem;
    }
    .language-button {
        width: 100%;
    }
}