* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: #f0f0f0;
}

h1 {
    margin-bottom: 10px;
    color: #333;
}

#game-container {
    position: relative;
    width: 510px;
    height: 400px;
    border: 2px solid #333;
    margin-bottom: 20px;
    background-color: #222;
    overflow: hidden;
}

#score {
    position: absolute;
    top: 10px;
    left: 10px;
    color: white;
    font-size: 18px;
}

#lives {
    position: absolute;
    top: 10px;
    right: 10px;
    color: white;
    font-size: 18px;
}

canvas {
    display: block;
    background-color: #222;
}

button {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    margin: 0 5px;
}

button:hover {
    background-color: #45a049;
}

#controls {
    margin-top: 10px;
    display: flex;
    gap: 10px;
}

#game-over {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    display: none;
}

#level-info {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    font-size: 14px;
}

.dark-mode .navbar{
    background: rgba(255, 255, 255, 0.2);
}

/* Navbar */
.navbar {
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-color: transparent;
    padding: 15px;
    display: flex;
    justify-content: flex-start;
}

/* Back Button */
.back-button {
    background: #2867f0;
    color: white;
    border: none;
    padding: 0.8rem 20px;
    width: 4rem;
    height: 2.5rem;
    font-size: 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.back-button:hover {
    background: #0190f6;
    transform: scale(1.05);
}

.toggle-btn {
    position: fixed;
    top: 0;
    right: 30px;
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 30px;
    cursor: pointer;
    transition: 0.3s;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Toggle theme style */
#toggleTheme {
    background: transparent;
    box-shadow: none;
    position: absolute;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Click animation (subtle scaling effect) */
#toggleTheme:active {
    transform: scale(0.9);
    opacity: 0.7;
}

/* Dark mode effect */
.dark-mode #toggleTheme {
    background: transparent;
    box-shadow: none;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Click animation in dark mode */
.dark-mode #toggleTheme:active {
    transform: scale(0.9);
    opacity: 0.7;
}

.toggle-btn:hover {
    background: #0056b3;
}

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

/* Dark mode for header */
.dark-mode nav {
    background: linear-gradient(135deg, #1e1e1e, #333);
}

.dark-mode .game-container{
    background: #2A2A2A;
}
.dark-mode h1{
    color: #fff;
}
.dark-mode .game-container button{
    color: #1e1e1e;
}
.dark-mode .game-container button:hover{
    background-color: #121212;
    color: #fff;
}