/* === Reset === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --accent:     #00ffc8;
    --accent-dim: rgba(0, 255, 200, 0.15);
    --accent-glow:rgba(0, 255, 200, 0.5);
    --bg:         #050a0f;
    --text:       #cce8e0;
}

html, body {
    width: 100%; height: 100%;
    overflow: hidden;
    background: var(--bg);
    font-family: 'Courier New', Courier, monospace;
    touch-action: none;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

/* === Canvas layers === */
#bgCanvas, #gameCanvas {
    position: fixed;
    display: block;
    top: 0; left: 0;
    width: 100%; height: 100%;
}
#bgCanvas   { z-index: 0; }
#gameCanvas { z-index: 1; touch-action: none; }

/* === UI shell === */
.game-shell {
    position: fixed;
    inset: 0;
    z-index: 10;
    pointer-events: none;
}
.game-shell > * { pointer-events: auto; }

/* === Help button === */
.help-btn {
    position: absolute;
    top: 16px; right: 16px;
    width: 44px; height: 44px;
    border-radius: 50%;
    border: 2px solid var(--accent);
    background: rgba(5, 10, 15, 0.85);
    color: var(--accent);
    font-size: 20px; font-weight: bold;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 30;
}
.help-btn:hover, .help-btn:focus {
    background: var(--accent-dim);
    box-shadow: 0 0 16px var(--accent-glow);
    outline: none;
}

/* === Help panel (fold-out) === */
.help-panel {
    position: absolute;
    top: 70px; right: 16px;
    width: min(280px, calc(100vw - 32px));
    background: rgba(3, 8, 14, 0.97);
    border: 1px solid rgba(0, 255, 200, 0.25);
    border-radius: 12px;
    padding: 18px 18px 14px;
    color: var(--text);
    font-size: 13px; line-height: 1.75;

    transform-origin: top right;
    transform: scale(0.88) translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 30;
}
.help-panel.open {
    transform: scale(1) translateY(0);
    opacity: 1;
    pointer-events: auto;
}
.help-close {
    position: absolute;
    top: 8px; right: 12px;
    background: none; border: none;
    color: var(--accent);
    font-size: 22px; line-height: 1;
    font-family: inherit; cursor: pointer; padding: 4px;
}
.help-panel h3 {
    color: var(--accent);
    font-size: 11px; letter-spacing: 3px;
    text-transform: uppercase; margin-bottom: 12px;
}
.help-panel ul { list-style: none; margin-bottom: 10px; }
.help-panel li { padding-left: 16px; position: relative; margin-bottom: 4px; }
.help-panel li::before { content: '▸'; position: absolute; left: 0; color: var(--accent); }
.help-footer {
    border-top: 1px solid rgba(0,255,200,0.12);
    padding-top: 10px;
    font-size: 12px;
    color: rgba(200,230,220,0.55);
}

/* === Pause & Menu === */
.pause-btn {
    position: absolute;
    top: 16px; left: 50%;
    transform: translateX(-50%);
    background: transparent;
    border: 2px solid var(--accent);
    color: var(--accent);
    width: 44px; height: 44px;
    border-radius: 50%;
    font-size: 16px; font-weight: bold;
    cursor: pointer; z-index: 20;
    transition: background 0.2s;
    opacity: 1; pointer-events: auto;
}
.pause-btn.hidden { opacity: 0; pointer-events: none; }
.pause-btn:hover { background: var(--accent-dim); }

.pause-overlay {
    position: absolute; inset: 0;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    background: rgba(5, 10, 15, 0.85);
    opacity: 0; pointer-events: none;
    transition: opacity 0.3s;
    z-index: 15;
    backdrop-filter: blur(5px);
}
.pause-overlay.visible { opacity: 1; pointer-events: auto; }
.pause-title { color: var(--text); font-size: 48px; letter-spacing: 8px; margin-bottom: 20px; }
.resume-btn {
    padding: 12px 40px; background: transparent; border: 2px solid var(--accent); color: var(--accent);
    font-size: 16px; letter-spacing: 3px; cursor: pointer; transition: 0.2s;
}
.resume-btn:hover { background: var(--accent-dim); }

/* === HUD === */
.hud {
    position: absolute;
    top: 16px; left: 16px;
    display: flex; flex-direction: column; gap: 2px;
    color: var(--accent);
    font-size: 12px; letter-spacing: 2px;
    opacity: 0; pointer-events: none;
    transition: opacity 0.4s ease;
}
.hud.visible { opacity: 1; }
.hud-level { font-size: 15px; font-weight: bold; }
.hud-score { opacity: 0.8; }
.hud-stuns { margin-top: 4px; font-size: 16px; color: #ffeb3b; text-shadow: 0 0 5px rgba(255,235,59,0.5); }
.stun-icon { margin-right: 3px; }
.hud-energy { margin-top: 4px; display: flex; gap: 3px; }
.energy-block { width: 14px; height: 10px; background: rgba(255,255,255,0.15); border: 1px solid rgba(0,255,200,0.3); transition: background 0.3s, box-shadow 0.3s; }
.energy-block.filled { background: var(--accent); box-shadow: 0 0 8px var(--accent-glow); }

/* === Start screen === */
.start-screen {
    position: absolute; inset: 0;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 20px;
    transition: opacity 0.4s ease;
}
.start-screen.hidden { opacity: 0; pointer-events: none; }

.game-title {
    font-size: clamp(38px, 10vw, 76px);
    color: var(--accent);
    letter-spacing: 8px; text-align: center; line-height: 1.1;
    text-shadow: 0 0 30px var(--accent-glow), 0 0 70px rgba(0,255,200,0.15);
}
.game-sub {
    color: rgba(0,255,200,0.5);
    font-size: 13px; letter-spacing: 4px;
    text-transform: uppercase; margin-top: -8px;
}
.start-btn {
    margin-top: 8px;
    padding: 14px 52px;
    background: transparent;
    border: 2px solid var(--accent);
    color: var(--accent);
    font-size: 18px; letter-spacing: 5px;
    font-family: inherit; cursor: pointer;
    text-transform: uppercase;
    transition: background 0.2s, box-shadow 0.2s;
}
.start-btn:hover, .start-btn:focus {
    background: var(--accent-dim);
    box-shadow: 0 0 24px var(--accent-glow);
    outline: none;
}

/* === Level complete === */
.level-complete {
    position: absolute; inset: 0;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 18px;
    opacity: 0; pointer-events: none;
    transition: opacity 0.5s ease;
}
.level-complete.visible { opacity: 1; pointer-events: auto; }

.complete-title {
    font-size: clamp(28px, 8vw, 52px);
    color: #ffd700; letter-spacing: 4px;
    text-shadow: 0 0 24px rgba(255,215,0,0.6);
}
.complete-bonus {
    color: rgba(255,215,0,0.7);
    font-size: 14px; letter-spacing: 2px;
}
.next-btn {
    padding: 12px 40px;
    background: transparent;
    border: 2px solid #ffd700;
    color: #ffd700;
    font-size: 15px; letter-spacing: 3px;
    font-family: inherit; cursor: pointer;
    transition: background 0.2s, box-shadow 0.2s;
}
.next-btn:hover, .next-btn:focus {
    background: rgba(255,215,0,0.12);
    box-shadow: 0 0 20px rgba(255,215,0,0.4);
    outline: none;
}

/* === Game Over screen === */
.game-over-screen {
    position: absolute; inset: 0;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 18px;
    background: rgba(5, 10, 15, 0.85);
    opacity: 0; pointer-events: none;
    transition: opacity 0.5s ease;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}
.game-over-screen.visible { opacity: 1; pointer-events: auto; }

.game-over-title {
    font-size: clamp(32px, 9vw, 64px);
    color: #ff3344; letter-spacing: 6px;
    text-shadow: 0 0 24px rgba(255,50,68,0.6);
}
.game-over-sub {
    color: rgba(255,100,100,0.8);
    font-size: 16px; letter-spacing: 3px;
    text-transform: uppercase;
}
.restart-btn {
    margin-top: 10px;
    padding: 12px 40px;
    background: transparent;
    border: 2px solid #ff3344;
    color: #ff3344;
    font-size: 16px; letter-spacing: 3px;
    font-family: inherit; cursor: pointer;
    text-transform: uppercase;
    transition: background 0.2s, box-shadow 0.2s;
}
.restart-btn:hover, .restart-btn:focus {
    background: rgba(255,51,68,0.15);
    box-shadow: 0 0 20px rgba(255,51,68,0.5);
    outline: none;
}

.highscore-entry {
    display: flex; gap: 10px; margin-top: 20px; margin-bottom: 20px;
}
.gamertag-input {
    padding: 8px 12px;
    background: rgba(0,0,0,0.5);
    border: 1px solid rgba(255,255,255,0.3);
    color: white; font-family: inherit; font-size: 14px;
    outline: none; text-align: center;
}
.gamertag-input:focus { border-color: var(--accent); }
.submit-score-btn {
    padding: 8px 16px; background: transparent; border: 1px solid var(--accent); color: var(--accent);
    cursor: pointer; font-family: inherit; transition: 0.2s;
}
.submit-score-btn:hover { background: var(--accent-dim); }

.highscore-board {
    background: rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.1);
    padding: 15px; border-radius: 8px;
    width: min(280px, calc(100vw - 32px));
    text-align: center;
    color: var(--text);
    margin-bottom: 20px;
    margin-top: 15px;
    max-height: 35vh;
    overflow-y: auto;
}
.highscore-board h3 { color: #ffd700; font-size: 14px; letter-spacing: 2px; margin-bottom: 10px; }
.highscore-board ul { list-style: none; padding: 0; font-size: 13px; text-align: left; }
.highscore-board li { display: flex; justify-content: space-between; margin-bottom: 5px; opacity: 0.8; }
.hs-rank { color: rgba(255,255,255,0.4); width: 20px; display: inline-block; }
.hs-name { color: #fff; flex-grow: 1; padding: 0 10px; }
.hs-score { color: var(--accent); }