/* ------------------------- GENERAL STYLES ------------------------- */

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    font-family: var(--font-family);
    background-color: var(--mid-green);
}

#game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background-color: var(--dark-purple);
}

.scrolling-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 300vw;
    height: 100vh;
    background-image: url("img/space-bg.jpg");
    background-size: 100vw 100vh;
    background-repeat: repeat-x;
    animation: scrollBackground 30s linear infinite;
    will-change: transform;
}

@keyframes scrollBackground {
    /* BACKGROUND MOVEMENT */
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-200vw);
    }
}

#character-select,
#game-screen,
#pause-screen,
#game-over {
    position: relative;
    z-index: 1;
}
/* ------------------------- INSTRUCTION BOX------------------------- */

.instructions-box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--dark-purple);
    border: 3px solid var(--light-green);
    border-radius: var(--space-small);
    padding: var(--space-medium);
    z-index: 10;
    max-width: 400px;
    text-align: center;
    box-shadow: 0 0 20px var(--mid-purple);
}

.instructions-box h3 {
    color: var(--light-green);
    font-size: calc(var(--text) * 1.2);
    margin-bottom: var(--space-regular);
}

.instructions-box ul {
    list-style-type: none;
    padding: 0;
    margin-bottom: var(--space-large);
    text-align: left;
}

.instructions-box li {
    color: var(--light-purple);
    font-size: var(--text);
    margin-bottom: var(--space-small);
    padding-left: var(--space-regular);
    position: relative;
}

.instructions-box li:before {
    content: "•";
    color: var(--light-green);
    position: absolute;
    left: 0;
}

#close-instructions {
    padding: var(--space-small) var(--space-regular);
    background-color: var(--light-green);
    color: var(--dark-purple);
    border: none;
    border-radius: var(--space-small);
    font-size: calc(var(--text) * 0.8);
    font-family: var(--font-family);
    cursor: pointer;
    transition: background-color 0.3s;
}

#close-instructions:hover {
    background-color: var(--mid-green);
}
/* ------------------------- CHARACTER SELECTI ------------------------- */
#character-select {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

h1 {
    color: var(--light-green);
    font-size: var(--header);
    margin-bottom: var(--space-large);
    text-shadow: 0 0 10px var(--mid-purple);
    text-align: center;
}

.text {
    color: var(--light-green);
    font-size: var(--text);
    text-shadow: 0 0 10px var(--mid-purple);
    text-align: center;
    margin-bottom: var(--space-large);
}

.character-options {
    display: flex;
    gap: var(--space-extra-large);
    margin-top: var(--space-large);
    margin-bottom: var(--space-extra-large);
}

.character-option {
    width: 150px;
    height: 150px;
    background-color: var(--dark-purple);
    border-radius: var(--space-small);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    padding: var(--space-small);
    border: 2px solid transparent;
    gap: var(--space-small);
}

.character-option:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px var(--light-purple);
}

.character-option.selected {
    border-color: var(--light-green);
    box-shadow: 0 0 20px var(--light-green);
}

.character-img {
    width: 100%;
    height: 100%;
    display: block;
}

.character-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.character-label {
    color: var(--light-green);
    font-size: 16px;
    text-align: center;
    text-transform: uppercase;
}

#confirm-btn {
    padding: var(--space-regular) var(--space-medium);
    background-color: var(--light-green);
    color: var(--dark-purple);
    border: none;
    border-radius: var(--space-small);
    font-size: var(--text);
    font-family: var(--font-family);
    cursor: pointer;
    transition: background-color 0.3s;
    text-transform: uppercase;
}

#confirm-btn:hover {
    background-color: var(--mid-green);
}

#confirm-btn:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

/* ------------------------- GAME SCREEN -------------------------*/
#game-screen {
    display: none;
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 5;
}

#player {
    position: absolute;
    width: 250px;
    height: 250px;
    left: var(--space-extra-large);
    top: 50%;
    transform: translateY(-50%);
    line-height: 1;
    z-index: 5;
}

#player img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.asteroid {
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    overflow: hidden;
    animation: spin 3s linear infinite;
}

.asteroid img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

#score-container {
    position: absolute;
    top: var(--space-regular);
    right: var(--space-regular);
    display: flex;
    align-items: center;
    gap: var(--space-regular);
    z-index: 5;
}

#score {
    color: var(--light-green);
    font-size: var(--text);
    font-weight: bold;
    background-color: var(--dark-purple);
    padding: var(--space-small) var(--space-regular);
    border-radius: var(--space-small);
    border: 2px solid var(--light-green);
    text-transform: uppercase;
}

#pause-btn {
    background-color: var(--dark-purple);
    color: var(--light-green);
    border: 2px solid var(--light-green);
    border-radius: var(--space-small);
    font-size: var(--text);
    font-family: var(--font-family);
    padding: var(--space-small) var(--space-regular);
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
}

#pause-btn:hover {
    background-color: var(--mid-purple);
    box-shadow: 0 0 10px var(--light-purple);
}

/* ------------------------- GAME OVER SCREEN ------------------------- */
#game-over {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(73, 19, 191, 0.8);
    z-index: 15;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#game-over h2 {
    color: var(--light-pink);
    font-size: var(--header);
    margin-bottom: var(--space-regular);
    text-shadow: 0 0 10px var(--mid-pink);
}

#final-score {
    color: var(--light-green);
    font-size: var(--text);
    margin-bottom: var(--space-extra-large);
}

#restart-btn {
    padding: var(--space-regular) var(--space-medium);
    background-color: var(--light-green);
    color: var(--dark-purple);
    border: none;
    border-radius: var(--space-small);
    font-size: var(--text);
    font-family: var(--font-family);
    cursor: pointer;
    transition: background-color 0.3s;
}

#restart-btn:hover {
    background-color: var(--mid-green);
}

/* ------------------------- UTILITY STYLES ------------------------- */

.invisible {
    opacity: 0;
}

/* ------------------------- PAUSE SCREEN ------------------------- */

#pause-screen {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(73, 19, 191, 0.8);
    z-index: 12;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--light-green);
}

#pause-screen h2 {
    font-size: var(--header);
    margin-bottom: var(--space-extra-large);
}

#resume-btn {
    padding: var(--space-regular) var(--space-medium);
    background-color: var(--light-green);
    color: var(--dark-purple);
    border: none;
    border-radius: var(--space-small);
    font-size: var(--text);
    font-family: var(--font-family);
    cursor: pointer;
    transition: background-color 0.3s;
}

#resume-btn:hover {
    background-color: var(--mid-green);
}

/* --------------------------- VARIABLES  --------------------------- */
:root {
    --font-family: "Ranchers", sans-serif;
    --header: 80px;
    --text: 24px;

    --light-green: #bfff41;
    --mid-green: #a3de1a;
    --dark-green: #46b800;
    --light-pink: #ffc2ec;
    --mid-pink: #f0429c;
    --dark-pink: #910b64;
    --light-purple: #dcccff;
    --mid-purple: #8655ef;
    --dark-purple: #4913bf;

    --space-extra-small: 4px;
    --space-small: 8px;
    --space-regular: 16px;
    --space-medium: 32px;
    --space-large: 48px;
    --space-extra-large: 80px;
    --space-huge: 160px;
}