body {
    font-family: 'Helvetica Neue', sans-serif;
    background-color: #f4f4f4;
    color: #333;
    text-align: center;
    transition: background-color 0.3s, color 0.3s;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.container {
    max-width: 600px;
    width: 100%;
}

.main-title {
    font-size: 2.5em;
    margin-bottom: 30px;
}

#category-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.category-btn {
    width: 80px;
    height: 80px;
    font-size: 1em;
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.category-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.category-btn.active {
    box-shadow: 0 0 0 4px #fff, 0 0 0 8px #007bff;
}

.category-btn[data-category="all"] { background-color: #8E44AD; }
.category-btn[data-category="korean"] { background-color: #C0392B; }
.category-btn[data-category="chinese"] { background-color: #D35400; }
.category-btn[data-category="japanese"] { background-color: #2980B9; }
.category-btn[data-category="western"] { background-color: #27AE60; }

#suggestionBtn {
    padding: 15px 30px;
    font-size: 1.2em;
    border: none;
    border-radius: 5px;
    background-color: #28a745;
    color: white;
    cursor: pointer;
    margin-bottom: 20px;
    transition: background-color 0.3s;
}

#suggestionBtn:disabled, #add-menu-btn:disabled, #remove-menu-btn:disabled {
    background-color: #6c757d;
    cursor: not-allowed;
}

#suggestionBtn:hover:not(:disabled) { background-color: #218838; }

#foodSuggestion { font-size: 1.5em; font-weight: bold; min-height: 50px; }

#action-buttons button {
    padding: 10px 20px;
    font-size: 1em;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #fff;
    color: #333;
    cursor: pointer;
    margin: 0 10px;
    transition: background-color 0.3s, color 0.3s;
}

#action-buttons button:hover { background-color: #f0f0f0; }

.theme-switch-wrapper { position: absolute; top: 20px; right: 20px; }
#theme-toggle {
    padding: 8px 12px;
    font-size: 0.9em;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #fff;
    cursor: pointer;
}

.menu-management {
    margin-top: 50px;
    padding: 20px;
    border-top: 2px solid #ddd;
    width: 100%;
    max-width: 600px;
}

.menu-management h2 { margin-bottom: 20px; }
.menu-management input, .menu-management select, .menu-management button {
    padding: 10px;
    font-size: 1em;
    border-radius: 5px;
    border: 1px solid #ccc;
    margin: 5px;
}

.menu-management button {
    background-color: #007bff;
    color: white;
    cursor: pointer;
}
.menu-management button:hover { background-color: #0056b3; }


body.dark-mode {
    background-color: #121212;
    color: #f4f4f4;
}

body.dark-mode .category-btn.active {
     box-shadow: 0 0 0 4px #121212, 0 0 0 8px #007bff;
}

body.dark-mode #action-buttons button, body.dark-mode #theme-toggle, 
body.dark-mode .menu-management input, body.dark-mode .menu-management select {
    background-color: #333;
    color: #f4f4f4;
    border-color: #555;
}

body.dark-mode .menu-management { border-top-color: #555; }