/* CSS Variables & Global Settings */
:root {
    --bg-color: #222;
    --text-color: #fff;
    --primary-color: #fca311;
    --secondary-color: #e63946;
    --btn-hover: #ffb703;
    --pixel-font: 'Press Start 2P', cursive;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    font-family: var(--pixel-font);
    color: var(--text-color);
}

/* Game Container and Canvas */
#game-container {
    position: relative;
    width: 100%;
    max-width: 540px;
    /* Mobile 9:16 layout vertical resolution */
    height: 100vh;
    max-height: 960px;
    background-color: #000;
    overflow: hidden;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    border: 4px solid #333;
}

#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
    /* Keep pixel art crisp */
    image-rendering: -moz-crisp-edges;
    image-rendering: -webkit-crisp-edges;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
}

/* UI Layers */
#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    /* Let clicks pass through to canvas when appropriate */
}

/* Screens */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s;
    pointer-events: auto;
    /* Buttons on screens need to be clickable */
}

.screen.active {
    opacity: 1;
    visibility: visible;
    z-index: 100;
}

h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    text-shadow: 4px 4px 0px #000;
    margin-bottom: 2rem;
    line-height: 1.5;
}

p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
    text-shadow: 2px 2px 0px #000;
}

.red-text {
    color: var(--secondary-color);
}

/* HUD Element */
#hud-top {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 15px 20px;
    box-sizing: border-box;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    pointer-events: none;
}

#hud-top.hidden {
    display: none;
}

.hud-left,
.hud-right,
.hud-center {
    display: flex;
    align-items: center;
}

#score-text {
    font-size: 1.2rem;
    text-shadow: 2px 2px 0px #000;
}

.hp-icon {
    width: 20px;
    height: 20px;
    margin-right: 5px;
    image-rendering: pixelated;
    filter: drop-shadow(2px 2px 0px #000);
}

.hp-icon.lost {
    filter: grayscale(100%) brightness(50%);
}

/* Input Field */
.input-group {
    margin-bottom: 20px;
}

#player-name-input {
    font-family: var(--pixel-font);
    font-size: 1rem;
    padding: 10px 15px;
    border: 4px solid var(--primary-color);
    background-color: rgba(0, 0, 0, 0.8);
    color: #fff;
    text-align: center;
    width: 250px;
    outline: none;
}

#player-name-input::placeholder {
    color: #888;
}

#player-name-input:focus {
    border-color: var(--text-color);
}

/* Buttons */
.pixel-btn {
    background-color: var(--primary-color);
    color: #fff;
    font-family: var(--pixel-font);
    font-size: 1rem;
    border: 4px solid #fff;
    padding: 15px 30px;
    margin-top: 20px;
    cursor: pointer;
    box-shadow: inset -4px -4px 0px rgba(0, 0, 0, 0.2);
    transition: transform 0.1s, background-color 0.2s;
    pointer-events: auto;
}

.pixel-btn:hover {
    background-color: var(--btn-hover);
    transform: scale(1.05);
}

.pixel-btn:active {
    transform: scale(0.95);
    box-shadow: inset 4px 4px 0px rgba(0, 0, 0, 0.2);
}

.small-btn {
    padding: 8px 15px;
    font-size: 0.8rem;
    background-color: var(--secondary-color);
}

.small-btn:hover {
    background-color: #f75564;
}