/* CSS Variables - Setup */
:root {
    /* Colors */
    --color-primary: #111;
    --color-text: #C0C0C0;
    --color-white: #fff;
    --color-shadow: rgba(255, 255, 255, 0.7);

    /* UI Colors */
    --header-bg: rgba(15, 17, 25, 0.35);
    --ui-element-bg: rgba(0, 0, 0, 0.15);
    --header-border: rgba(255, 255, 255, 0.06);

    /* Dimensions */
    --game-width: 640px;
    --game-height: 640px;
    --header-height: 32px;
    --player-width: 54px;
    --player-height: 45px;

    /* Z-index layers */
    --z-effects: 1000;
    --z-header: 2000;
    --z-game: 2;
    --z-background: 1;

    /* Typography */
    --font-primary: 'Press Start 2P', cursive;
    --font-size-normal: 11px;
    --font-size-large: 16px;

    /* Effects */
    --glow-primary: rgba(255, 255, 255, 0.07);
    --glow-secondary: rgba(255, 255, 255, 0.03);
    --text-shadow: 0 1px 1px rgba(0, 0, 0, 0.5);

    /* Transitions */
    --transition-standard: 0.3s;
}

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

body {
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: var(--color-primary);
    overflow: hidden;
    font-family: var(--font-primary);
    -webkit-font-smoothing: antialiased;
}

/* Lobby Section */
#lobby {
    position: relative;
    width: var(--game-width);
    height: var(--game-height);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.3));
}

#lobby-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 70%;
    background-image: url('assets/Lobby.webp');
    background-size: cover;
    z-index: var(--z-background);
    filter: brightness(0.9) contrast(1.1);
}

#lobby-logo {
    margin-top: 50px;
    width: 400px;
    height: 135px;
    margin-bottom: 5px;
    z-index: var(--z-effects);
    transition: transform var(--transition-standard) ease;
    filter: drop-shadow(0 0 10px var(--glow-primary));
}

#lobby-logo:hover {
    transform: scale(1.02);
}

#lobby-text {
    color: #fffae0f7;
    font-family: var(--font-primary);
    font-size: var(--font-size-large);
    text-align: center;
    text-shadow: 0px 2px 44px var(--color-shadow),
        0 0 10px rgba(255, 255, 255, 0.2);
    margin-bottom: 20px;
    z-index: var(--z-game);
    animation: pulse 1.5s infinite;
}

#lobby-image {
    margin-top: 120px;
    z-index: var(--z-game);
}

.directions {
    color: #f3f3f3d7;
    font-size: small;
    z-index: 10000;
    align-items: left;
    padding-bottom: 5px;
}

/* Game Section */
#game {
    position: relative;
    width: var(--game-width);
    height: var(--game-height);
    overflow: hidden;
    display: none;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.4) 0%, rgba(0, 0, 0, 0) 20%);
}

#background {
    position: absolute;
    top: 0;
    left: 0;
    width: var(--game-width);
    height: var(--game-height);
    background-image: url('assets/Playground.webp');
    background-size: cover;
    filter: contrast(1.1) brightness(0.95);
}

/* Game Elements */
#enemies-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-background);
}

.enemy {
    position: absolute;
    transition: transform 0.016s linear;
    will-change: transform;
    filter: drop-shadow(0 0 3px rgba(255, 0, 0, 0.2));
}

#player {
    position: absolute;
    width: 48px;
    height: 48px;
    background-image: url('assets/enemy-big.png');
    background-size: 200% 100%;
    background-repeat: no-repeat;
    will-change: transform, background-position;
    z-index: var(--z-game);
    filter: drop-shadow(0 0 5px var(--glow-primary));
    transform-origin: center center;
    image-rendering: pixelated;
    animation: playerSpriteAnimation 0.2s steps(2) infinite;
}

/* Sprite Animation (Switches Frames) */
@keyframes playerSpriteAnimation {

    /* First frame */
    0% {
        background-position: 0px 0;
    }

    /* Second frame (We do re-scale in: background-size)*/
    100% {
        background-position: -96px 0;
    }
}

/* Header and UI Elements */
.header {
    z-index: var(--z-header);
    position: absolute;
    width: calc(var(--game-width) - 24px);
    height: 30px;
    /* Fixed height */
    left: 13px;
    top: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(180deg,
            rgba(20, 22, 30, 0.4) 0%,
            rgba(15, 17, 25, 0.35) 100%);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    border-radius: 12px;
    padding: 0 15px;
    border: 1px solid var(--header-border);
}

.score {
    display: flex;
    gap: 6px;
    align-items: center;
    background: var(--ui-element-bg);
    border-radius: 6px;
    padding: 0 8px;
}

.lives {
    display: flex;
    gap: 5px;
    align-items: center;
    background: var(--ui-element-bg);
    border-radius: 6px;
    padding: 0 8px;
}

.wave {
    display: flex;
    align-items: center;
    background: var(--ui-element-bg);
    border-radius: 6px;
    padding: 0 8px;
}

.score img {
    width: 20px;
    height: 20px;
    opacity: 0.9;
    filter: drop-shadow(0 0 2px var(--glow-primary));
}

.lives img {
    width: 30px;
    height: 30px;
    opacity: 0.9;
    transition: opacity var(--transition-standard);
    filter: drop-shadow(0 0 2px var(--glow-primary));
}


/* Typography */
.header a,
.time,
.wave {
    font-family: var(--font-primary);
    font-size: 12px;
    color: var(--color-text);
    text-shadow: var(--text-shadow);
}

.time {
    margin: 0 12px;
}

/* Bullet System */
#bullets-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--z-background);
    pointer-events: none;
}

.bullet {
    position: absolute;
    z-index: var(--z-game);
    pointer-events: none;
    filter: drop-shadow(0 0 2px var(--glow-primary));
}

@keyframes pulse {
    0% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }

    100% {
        opacity: 1;
    }
}

/* Performance Optimizations */
.enemy,
#player,
.bullet {
    transform: translateZ(0);
    backface-visibility: hidden;
}


/* Reduce paint operations by grouping transforms */
.enemy,
.bullet,
#player {
    transform-origin: center center;
    contain: layout style paint;
}

/* Optimize composite layers */
.header {
    contain: layout style;
    z-index: var(--z-header);
}

/* Add this to your existing CSS */
.explosion {
    position: absolute;
    pointer-events: none;
    width: 48px;
    height: 48px;
    transform-origin: center center;
    will-change: transform, opacity;
    z-index: 1;
}

.explosion::before,
.explosion::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: rgba(255, 200, 0, 0.8);
    transform: scale(0);
    opacity: 1;
}

.explosion.active::before {
    animation: explode1 0.3s ease-out forwards;
}

.explosion.active::after {
    animation: explode2 0.3s ease-out forwards;
}

@keyframes explode1 {
    to {
        transform: scale(1.2);
        opacity: 0;
    }
}

@keyframes explode2 {
    to {
        transform: scale(0.8);
        opacity: 0;
    }
}

/* Victory and game-over screens */
.game-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 1000;
}

.game-screen.hidden {
    display: none;
}

.screen-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: white;
    padding: 2rem;
}

.result-image {
    width: 200px;
    height: auto;
    margin-bottom: 1rem;
}

.stats {
    margin: 1rem 0;
    font-size: 1.2rem;
}

.restart-btn {
    padding: 0.8rem 1.5rem;
    font-size: 1.1rem;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
    position: absolute;
    top: 95%;
    left: 50%;
    transform: translateX(-50%);
    /* Distance from the bottom */
}

.restart-btn:hover {
    background-color: #45a049;
}

/* Pause Modal Styles */
.pause-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    line-height: 1.7;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1500;
    font-family: var(--font-primary);
    color: white;
}

.pause-modal.hidden {
    display: none;
}

.pause-content h2 {
    text-align: center;
    animation: pulse 2s infinite;
}

.screen-content h2 {
    animation: pulse 2s infinite;
}

/**** Cutscene ****/
.scene {
    position: absolute;
    width: 640px;
    height: 640px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: none;
    /* Hidden by default */
    overflow: hidden;
    background: #000;
    z-index: 999;
    /* Ensure it appears above the lobby/game */
}

.scene-img {
    position: absolute;
    width: 640px;
    height: 640px;
    top: 0;
    left: 0;
    object-fit: cover;
}

.scene-text {
    position: absolute;
    width: 80%;
    left: 50%;
    top: 85%;
    transform: translate(-50%, -50%);
    color: #fff;
    text-align: center;
    font-family: 'Press Start 2P', sans-serif;
    font-size: 16px;
    white-space: pre-wrap;
    line-height: 1.7;
}

#mid-scene-text {
    top: 90%;
}

/************ ScoreBoard *************/
.scoreboard-container {
    margin-top: 1rem;
    margin-bottom: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 1rem;
}

.scoreboard-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
    color: #fff;
    font-family: var(--font-primary);
    font-size: 12px;
}

.scoreboard-table th,
.scoreboard-table td {
    border: 1px solid #888;
    padding: 0.5rem;
    text-align: center;
}

.input-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 1rem;
}

.score-input {
    background: #222;
    color: #fff;
    border: 1px solid #555;
    padding: 0.5rem;
    font-family: 'Press Start 2P', cursive;
    margin-right: 0.5rem;
    border-radius: 4px;
}

.submit-btn {
    background-color: #555;
    color: #fff;
    border: none;
    padding: 0.6rem 1rem;
    font-family: 'Press Start 2P', cursive;
    cursor: pointer;
    transition: background-color 0.3s;
    border-radius: 4px;
    margin-top: 0.5rem;
}

.submit-btn:hover {
    background-color: #777;
}

.error-message {
    color: red;
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

.percentile-message {
    color: #0f0;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    text-align: center;
}

.pagination-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 1rem;
}

.pagination-btn {
    background-color: #333;
    color: #fff;
    border: none;
    padding: 0.3rem 0.6rem;
    font-family: 'Press Start 2P', cursive;
    cursor: pointer;
    margin: 0 0.5rem;
    border-radius: 4px;
}

.pagination-btn:hover {
    background-color: #555;
}

.page-info {
    font-family: 'Press Start 2P', cursive;
    font-size: 0.8rem;
    color: #fff;
    margin: 0 0.5rem;
}