@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;1,100;1,200;1,300;1,400;1,500;1,600;1,700&family=Rubik+Gemstones&display=swap");

:root {
    --background-color: #2c003e; 
    --background-secondary-color: #3b0050;  
    --canvas-color: #ecf0f1;
    --text-color: rgba(255, 0, 0, 1); 
    --sidebar-color: #2c003e;
    --button-color: #e74c3c;
    --hover-color: #c0392b;
    --button-text-color: #ffffff; 
}

* {
    box-sizing: border-box;
}

body { 
    background: linear-gradient(to right, var(--background-color), var(--background-secondary-color)); 
    font-family: 'IBM Plex Sans', sans-serif; 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: space-between; 
    min-height: 100vh; 
    margin: 0; 
    padding: 0; 
}

h1 {
    font-family: 'Rubik Gemstones', cursive;
    font-size: 3rem;
    color: var(--text-color);
    animation: fadeInDown 1s;
}

@keyframes fadeInDown {
    0% {
        opacity: 0;
        transform: translateY(-50px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

canvas {
    background-color: var(--canvas-color);
    display: block;
    border-radius: 10px;
    width: 800px;
    max-width: 96%;
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
    animation: fadeInUp 1s;
}

@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(50px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

.btn {
    cursor: pointer;
    border: 0;
    padding: .625rem 1.25rem;
    background-color: var(--button-color);
    color: var(--button-text-color);
    border-radius: 5px;
    font-family: 'IBM Plex Sans', sans-serif;
    font-size: 1rem;
    transition: background-color 0.3s, transform 0.3s;
}

.btn:focus {
    outline: 0;
}

.btn:hover {
    background-color: var(--hover-color);
    transform: translateY(-3px);
}

.btn:active {
    transform: scale(0.98);
}

.rules-btn {
    position: absolute;
    top: 1.875rem;
    left: 1.875rem;
    animation: fadeInLeft 1s;
}

@keyframes fadeInLeft {
    0% {
        opacity: 0;
        transform: translateX(-50px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

.rules {
    position: absolute;
    top: 0;
    left: 0;
    background-color: rgba(44, 0, 62, 0.8); 
    color: var(--button-text-color);
    min-height: 100vh;
    width: 400px;
    line-height: 1.5;
    transform: translateX(-400px);
    transition: transform 1s ease-in-out;
    padding: 20px;
    text-align: center;
    box-sizing: border-box;
}
.rules p { 
    text-indent: 0; 
    margin-bottom: 10px;
}

#close-btn {
    display: block;
    margin: 20px auto 0;
}

.rules.show {
    transform: translateX(0);
}

.content { flex: 1; 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center; 
}

footer {
    width: 100%;
    text-align: center;
    background-color: var(--sidebar-color);
    color: var(--button-text-color);
    padding: 10px 0;
}

footer p {
    margin: 5px 0;
}