:root {
    --bg-color-light: #f0f8ff; /* AliceBlue */
    --text-color-light: #4a4a4a;
    --header-bg-light: #e6e6fa; /* Lavender */
    --border-color-light: #d8bfd8; /* Thistle */
    --button-bg-light: #98fb98; /* PaleGreen */
    --button-text-light: #333;

    --bg-color-dark: #2c3e50; /* Dark Slate Gray */
    --text-color-dark: #ecf0f1; /* Clouds */
    --header-bg-dark: #34495e; /* Wet Asphalt */
    --border-color-dark: #95a5a6; /* Concrete */
    --button-bg-dark: #27ae60; /* Nephritis */
    --button-text-dark: #ecf0f1;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s, color 0.3s;
    text-align: center;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid;
    margin-bottom: 30px;
}

header h1 {
    margin: 0;
    font-size: 24px;
    font-weight: 400;
}

.theme-switcher button, .language-switcher a {
    padding: 8px 12px;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
    border-radius: 5px;
    text-decoration: none;
    font-size: 14px;
}

.language-switcher {
    margin-top: 30px;
}

.recommender {
    padding: 20px 0;
}

#recommend-btn {
    padding: 12px 25px;
    font-size: 18px;
    cursor: pointer;
    border: none;
    border-radius: 8px;
    transition: transform 0.2s;
}

#recommend-btn:hover {
    transform: scale(1.05);
}

.recommendation-output {
    margin-top: 30px;
    font-size: 26px;
    font-weight: bold;
    min-height: 40px;
}

#food-image {
    margin-top: 20px;
    max-width: 100%;
    border-radius: 10px;
    border: 3px solid;
    display: block; /* To handle display toggle */
}


/* Light Mode */
.light-mode {
    background-color: var(--bg-color-light);
    color: var(--text-color-light);
}
.light-mode header { border-bottom-color: var(--border-color-light); }
.light-mode .theme-switcher button { background-color: #fff; color: #333; border: 1px solid var(--border-color-light); }
.light-mode .language-switcher a { background-color: #fff; color: #333; border: 1px solid var(--border-color-light); }
.light-mode #recommend-btn { background-color: var(--button-bg-light); color: var(--button-text-light); }
.light-mode #food-image { border-color: var(--border-color-light); }

/* Dark Mode */
.dark-mode {
    background-color: var(--bg-color-dark);
    color: var(--text-color-dark);
}
.dark-mode header { border-bottom-color: var(--border-color-dark); }
.dark-mode .theme-switcher button { background-color: #555; color: #fff; }
.dark-mode .language-switcher a { background-color: #555; color: #fff; }
.dark-mode #recommend-btn { background-color: var(--button-bg-dark); color: var(--button-text-dark); }
.dark-mode #food-image { border-color: var(--border-color-dark); }