body {
    margin: 0;
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: #f4f4f4;
    min-height: 100vh;
}

header {
    text-align: center;
    margin: 30px;
}

header h1 {
    margin: 0;
    font-size: 3em;
}

header p {
    font-size: 1.1em;
    color: #555;
}

.category-nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    margin: 20px;
}

.category-nav button {
    background: white;
    border: 2px solid #ccc;
    border-radius: 30px;
    padding: 8px 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1em;
}

.category-nav button.active, 
.category-nav button:hover {
    background: #333;
    color: white;
}

.emoji-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(60px, 1fr));
    gap: 15px;
    padding: 20px;
    max-width: 1200px;
}

.emoji {
    font-size: 2em;
    background: white;
    padding: 12px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    cursor: pointer;
    user-select: none;
    text-align: center;
    transition: transform 0.2s ease, background 0.2s ease;
}

.emoji:hover {
    transform: scale(1.2);
    background: #e0e0e0;
}

#notification {
    position: fixed;
    bottom: 20px;
    background: #333;
    color: white;
    padding: 10px 20px;
    border-radius: 30px;
    opacity: 0;
    transition: opacity 0.3s ease;
}