body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

:root {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --text-muted: #b0b0b0;
    --border-color: #333;
    --highlight: #4CAF50;
}

[data-theme="light"] {
    --bg-color: #f4f7f6;
    --container-bg: #ffffff;
    --text-color: #333333;
    --text-muted: #666666;
    --border-color: #ddd;
    --highlight: #2e7d32;
}

.container {
    text-align: center;
    padding: 2rem;
    background: var(--container-bg);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    max-width: 500px;
    border: 1px solid var(--border-color);
}

h1 { 
    color: var(--highlight); 
    margin-bottom: 1rem; 
}

p { 
    line-height: 1.6; 
    color: var(--text-muted); 
}

.theme-switch {
    position: absolute;
    top: 20px;
    left: 20px;
}

.theme-btn {
    cursor: pointer;
    border: none;
    background: none;
    font-size: 24px;
    transition: transform 0.2s;
}

.theme-btn:hover {
    transform: scale(1.2);
}

.lang-switch {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
}

.lang-btn {
    cursor: pointer;
    border: none;
    background: none;
    font-size: 24px;
    transition: transform 0.2s;
    filter: grayscale(0.5);
}

.lang-btn:hover {
    transform: scale(1.2);
    filter: grayscale(0);
}

.lang-btn.active {
    filter: grayscale(0);
    transform: scale(1.1);
    outline: 2px solid var(--highlight);
    border-radius: 4px;
}