:root {
    --bg-color: #f0f2f5;
    --text-color: #333;
    --container-bg: #fff;
    --input-border: #ccc;
    --button-bg: #007bff;
    --button-text: #fff;
    --list-item-bg: #f9f9f9;
    --list-item-border: #007bff;
    --gradient-start: #a18cd1;
    --gradient-end: #fbc2eb;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #e1e1e1;
    --container-bg: #2d2d2d;
    --input-border: #555;
    --button-bg: #bb86fc;
    --button-text: #121212;
    --list-item-bg: #333;
    --list-item-border: #bb86fc;
    --gradient-start: #2c3e50;
    --gradient-end: #4ca1af;
}

body {
    font-family: sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    min-height: 100vh;
    background-image: linear-gradient(to top, var(--gradient-start) 0%, var(--gradient-end) 100%);
    transition: background-color 0.3s, color 0.3s;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 90%;
    max-width: 500px;
    margin-bottom: 20px;
}

.language-switcher button {
    margin-left: 10px;
}

#theme-toggle,
.language-switcher button {
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.3s, box-shadow 0.3s;
}

#theme-toggle:hover,
.language-switcher button:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}


.container {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 500px;
    transition: transform 0.3s ease-in-out, background-color 0.3s;
}

.container:hover {
    transform: translateY(-5px);
}

h1 {
    font-size: 2.5em;
    color: var(--text-color);
    margin-bottom: 20px;
    font-weight: 700;
}

#searchInput {
    width: calc(100% - 22px);
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 1em;
    margin-bottom: 15px;
    box-sizing: border-box;
    background-color: var(--container-bg);
    color: var(--text-color);
}

#searchButton {
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.3s, box-shadow 0.3s;
}

#searchButton:hover {
    opacity: 0.8;
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.4);
}

#songList {
    list-style-type: none;
    padding: 0;
    margin-top: 20px;
    text-align: left;
}

#songList li {
    background-color: var(--list-item-bg);
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 8px;
    border-left: 5px solid var(--list-item-border);
    transition: background-color 0.3s;
}

#songList li:hover {
    background-color: rgba(0,0,0,0.1);
}