:root {
    --bg-color: #1a1a1a;
    --text-color: #fff;
    --container-bg-color: #2c2c2c;
    --h1-color: #f0f0f0;
    --menu-item-bg-color: #3a3a3a;
    --menu-item-box-shadow-1: #121212;
    --menu-item-box-shadow-2: #484848;
    --placeholder-color: #555;
}

[data-theme="light"] {
    --bg-color: #f0f2f5;
    --text-color: #333;
    --container-bg-color: #ffffff;
    --h1-color: #333;
    --menu-item-bg-color: #f8f9fa;
    --menu-item-box-shadow-1: #d1d9e6;
    --menu-item-box-shadow-2: #ffffff;
    --placeholder-color: #bbb;
}


body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 150px;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.top-bar {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 15px;
    align-items: center;
    z-index: 100;
}

.navbar {
    width: 100%;
    background-color: var(--container-bg-color);
    padding: 15px 0;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: absolute;
    top: 60px;
    left: 0;
    z-index: 99;
}

.navbar a {
    color: var(--text-color);
    text-decoration: none;
    margin: 0 20px;
    font-size: 1.1em;
    font-weight: 500;
    transition: color 0.3s;
}

.navbar a:hover, .navbar a.active {
    color: #007bff;
}

.lang-switcher button {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    color: var(--text-color);
}

.container {
    text-align: center;
    background-color: var(--container-bg-color);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2), 0 6px 6px rgba(0, 0, 0, 0.23);
    transition: background-color 0.3s;
}

h1 {
    margin-bottom: 30px;
    font-size: 2.5em;
    color: var(--h1-color);
    transition: color 0.3s;
}

.menu-display-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 40px;
    min-height: 120px;
}

#menu-item {
    font-size: 2.5em;
    font-weight: bold;
    color: var(--text-color);
    padding: 20px 40px;
    border-radius: 15px;
    background-color: var(--menu-item-bg-color);
    box-shadow: 5px 5px 10px var(--menu-item-box-shadow-1), -5px -5px 10px var(--menu-item-box-shadow-2);
    transition: all 0.3s ease;
}

.menu-item-placeholder {
    color: var(--placeholder-color);
}

#recommend-btn {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2em;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 6px rgba(0, 123, 255, 0.3);
}

#recommend-btn:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

#recommend-btn:active {
    transform: translateY(1px);
}

#theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
}