:root {
    --bg-color: #020617;
    /* Very dark blue (slate-950) */
    --text-color: #e2e8f0;
    --neon-blue: #38bdf8;
    --neon-pink: #f472b6;
    --neon-red: #ef4444;
    --canvas-border: #1e293b;
    --font-stack: 'Orbitron', system-ui, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

body {
    font-family: var(--font-stack);
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 20px;
    -webkit-tap-highlight-color: transparent;
    /* Subtle deep space background using gradients */
    background-image: radial-gradient(circle at 50% 0%, #0f172a 0%, #020617 70%);
}

.page-container {
    max-width: 500px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

/* Header */
.seo-header {
    text-align: center;
    background: transparent;
    width: 100%;
    border-bottom: 2px solid var(--canvas-border);
    padding-bottom: 15px;
}

.seo-header h1 {
    font-size: 1.6rem;
    color: var(--neon-blue);
    text-shadow: 0 0 10px rgba(56, 189, 248, 0.5);
    margin-bottom: 15px;
    letter-spacing: 1px;
}

.seo-header p {
    font-size: 0.85rem;
    line-height: 1.8;
    color: #94a3b8;
    font-family: system-ui, -apple-system, sans-serif;
}

.seo-header strong {
    color: var(--neon-pink);
}

/* Game Interface */
.game-wrapper {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.hud {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(5px);
    border: 1px solid var(--canvas-border);
    border-radius: 8px;
    padding: 10px 15px;
}

.score-container,
.lives-container {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.score-container span:first-child,
.lives-container span:first-child {
    font-size: 0.7rem;
    color: var(--neon-blue);
    letter-spacing: 2px;
}

#score {
    font-size: 1.2rem;
    color: #fff;
    text-shadow: 0 0 5px #fff, 0 0 10px var(--neon-blue);
    letter-spacing: 2px;
}

#lives {
    font-size: 1rem;
    letter-spacing: 2px;
}

/* Canvas Area */
.canvas-container {
    width: 100%;
    aspect-ratio: 3/4;
    /* Vertical shoot-em-up ratio */
    position: relative;
    overflow: hidden;
    background: #000;
    border: 2px solid var(--canvas-border);
    border-radius: 8px;
    box-shadow: 0 0 30px rgba(56, 189, 248, 0.1);
}

#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
    /* Keep cursor default or crosshair over canvas */
    cursor: crosshair;
}

/* Overlays */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(2, 6, 23, 0.85);
    /* Dark slate overlay */
    backdrop-filter: blur(3px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10;
    transition: opacity 0.3s;
}

.overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.overlay-content {
    text-align: center;
    padding: 20px;
}

.neon-text {
    font-size: 2rem;
    color: #fff;
    text-shadow: 0 0 5px #fff, 0 0 10px var(--neon-blue), 0 0 20px var(--neon-blue);
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.neon-text.danger {
    text-shadow: 0 0 5px #fff, 0 0 10px var(--neon-red), 0 0 20px var(--neon-red);
}

.overlay-content p {
    font-size: 1rem;
    color: var(--neon-pink);
    letter-spacing: 2px;
}

.overlay-content .instructions {
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 0.8rem;
    color: #94a3b8;
    margin-top: 20px;
    letter-spacing: normal;
}

.blink {
    animation: blinker 1.5s linear infinite;
}

@keyframes blinker {
    50% {
        opacity: 0;
    }
}

.neon-btn {
    background: transparent;
    border: 2px solid var(--neon-pink);
    color: var(--neon-pink);
    padding: 15px 30px;
    font-family: var(--font-stack);
    font-size: 1rem;
    letter-spacing: 2px;
    border-radius: 4px;
    margin-top: 30px;
    cursor: pointer;
    box-shadow: inset 0 0 10px rgba(244, 114, 182, 0.2), 0 0 10px rgba(244, 114, 182, 0.2);
    transition: all 0.2s;
}

.neon-btn:hover,
.neon-btn:active {
    background: var(--neon-pink);
    color: #000;
    box-shadow: 0 0 20px var(--neon-pink);
}

/* Article & SEO Area */
.seo-article {
    background: transparent;
    padding: 20px 0;
    width: 100%;
    font-family: system-ui, -apple-system, sans-serif;
    color: #94a3b8;
}

.seo-article h2 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--text-color);
    font-family: var(--font-stack);
}

.seo-article ul {
    list-style-position: inside;
    line-height: 1.8;
}

.seo-article li {
    margin-bottom: 15px;
}

.seo-article strong {
    color: var(--text-color);
}

.back-link {
    margin-bottom: 40px;
    font-family: system-ui, -apple-system, sans-serif;
    width: 100%;
    text-align: center;
}

.back-link a {
    color: var(--neon-blue);
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    padding: 10px 20px;
    border: 1px solid rgba(56, 189, 248, 0.3);
    border-radius: 20px;
    display: inline-block;
    transition: all 0.2s;
}

.back-link a:hover {
    background: rgba(56, 189, 248, 0.1);
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
}