:root {
    --color-primary: #ffaa22; /* Amber (UI primary) */
    --color-secondary: #ffaa22; /* Amber */
    --color-danger: #ffaa22;
    --color-success: #7A1BC8; /* Violet for in-game accents where needed */
    --color-bg: #000000;
    --font-main: 'monospace', sans-serif;
}

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

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--color-bg);
    color: white;
    font-family: var(--font-main);
}

#game-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.screen {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: radial-gradient(ellipse at center, #000510 0%, #000000 100%);
    z-index: 10;
}

.screen.hidden {
    display: none !important;
}

#hud {
    background: transparent;
    pointer-events: none;
    z-index: 5;
}

/* Menu Content */
.menu-content {
    text-align: center;
    max-width: 500px;
    padding: 20px;
}

.title {
    font-size: 48px;
    font-weight: 900;
    letter-spacing: 8px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--color-primary);
    font-size: 13px;
    letter-spacing: 4px;
    margin-bottom: 48px;
}

.instructions {
    color: var(--color-primary);
    font-size: 12px;
    line-height: 2;
    margin-bottom: 48px;
    text-align: left;
}

.controls-hint {
    margin-top: 12px;
    color: var(--color-primary);
    text-align: center;
}

/* Buttons */
.btn-primary {
    padding: 14px 48px;
    font-size: 16px;
    letter-spacing: 6px;
    font-family: var(--font-main);
    font-weight: 700;
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    cursor: pointer;
    text-shadow: 0 0 10px var(--color-primary);
    box-shadow: 0 0 20px rgba(255,170,34,0.14); /* subtle amber glow */
    transition: all 0.2s;
}

.btn-primary:hover {
    background: rgba(255,170,34,0.08); /* subtle amber hover */
    box-shadow: 0 0 40px rgba(255,170,34,0.45); /* amber glow on hover */
}

/* HUD elements */
.hud-top-left { position: absolute; top: 20px; left: 20px; display: flex; gap: 8px; }
.hud-top-right { position: absolute; top: 20px; right: 20px; text-align: right; }

.hp-bar { display: flex; gap: 8px; }
.hp-dot {
    width: 20px; height: 20px; border-radius: 50%;
    transition: all 0.2s;
}
.hp-dot.active { background: var(--color-primary); box-shadow: 0 0 8px var(--color-primary); }
.hp-dot.empty { background: var(--color-bg); }

.threat-text { color: var(--color-secondary); font-size: 13px; text-shadow: 0 0 8px var(--color-secondary); }
.level-text { color: #aaaaaa; font-size: 11px; margin-top: 4px; }

/* Crosshair */
.crosshair {
    position: absolute;
    width: 24px;
    height: 24px;
}
.crosshair .dot {
    position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%);
    width: 3px; height: 3px; border-radius: 50%; background: rgba(255,255,255,0.4);
    transition: width 0.1s, height 0.1s;
}
.crosshair .line { position: absolute; background: rgba(255,255,255,0.5); }
.crosshair .top, .crosshair .bottom { width: 1px; height: 7px; left: 50%; transform: translateX(-50%); }
.crosshair .left, .crosshair .right { width: 7px; height: 1px; top: 50%; transform: translateY(-50%); }
.crosshair .top { top: 0; } .crosshair .bottom { bottom: 0; }
.crosshair .left { left: 0; } .crosshair .right { right: 0; }

/* Entropy Bar */
.entropy-container {
    position: absolute; bottom: 64px; left: 50%; transform: translateX(-50%);
    width: 200px; text-align: center;
    transition: transform 0.1s;
}

.entropy-container.warning {
    animation: entropy-warning-pulse 0.4s infinite;
}

@keyframes entropy-warning-pulse {
    0%, 100% { transform: translateX(-50%) scale(1); filter: saturate(1) brightness(1); }
    50% { transform: translateX(-50%) scale(1.08); filter: saturate(2) brightness(1.4); }
}
.entropy-label { font-size: 11px; letter-spacing: 3px; margin-bottom: 4px; transition: color 0.3s; }
.bar-bg { width: 100%; height: 8px; background: #111; border: 1px solid #333; border-radius: 4px; overflow: hidden; }
.bar-fill { height: 100%; width: 0%; transition: width 0.1s, background 0.3s; }
.bar-notches { display: flex; justify-content: space-between; margin-top: 4px; }
.bar-notches span { width: 2px; height: 4px; background: var(--color-bg); }

/* Overheat */
.overheat-text {
    position: absolute; top: 40%; color: var(--color-danger); font-size: 18px;
    letter-spacing: 6px; text-shadow: 0 0 20px var(--color-danger);
    animation: pulse 0.5s infinite;
}
.overheat-text.hidden {
    display: none !important;
}

/* States */
.dead { color: var(--color-danger); text-shadow: 0 0 30px var(--color-danger); }
.subtitle.dead { color: #442200; }
.dead-btn { border-color: var(--color-danger); color: var(--color-danger); text-shadow: 0 0 10px var(--color-danger); }

.complete { color: #5577aa; text-shadow: 0 0 30px var(--color-success); }
.level-complete-tag { color: var(--color-success); font-size: 14px; letter-spacing: 8px; margin-bottom: 8px; text-shadow: 0 0 20px var(--color-success); }
.complete-btn { border-color: var(--color-success); color: var(--color-success); text-shadow: 0 0 10px var(--color-success); }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.bottom-hint { position: absolute; bottom: 16px; color: var(--color-primary); font-size: 10px; letter-spacing: 2px; }

/* Hit Glow Indicators */
.hit-glow {
    position: absolute;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.1s;
    z-index: 4;
}
.hit-glow.top { top: 0; left: 0; width: 100%; height: 150px; background: linear-gradient(to bottom, rgba(255, 170, 34, 0.6), transparent); }
.hit-glow.bottom { bottom: 0; left: 0; width: 100%; height: 150px; background: linear-gradient(to top, rgba(255, 170, 34, 0.6), transparent); }
.hit-glow.left { top: 0; left: 0; width: 150px; height: 100%; background: linear-gradient(to right, rgba(255, 170, 34, 0.6), transparent); }
.hit-glow.right { top: 0; right: 0; width: 150px; height: 100%; background: linear-gradient(to left, rgba(255, 170, 34, 0.6), transparent); }

#joystick-container {
    position: absolute;
    bottom: 40px;
    left: 40px;
    width: 120px;
    height: 120px;
    z-index: 20;
    pointer-events: auto;
}