:root {
    --bg-dark: #05080c;
    --card-bg: rgba(12, 18, 28, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --neon-green: #84cc16;
    --neon-purple: #9d4edd;
    --text-color: #f8fafc;
    --text-muted: #475569;
    --font-pixel: 'Press Start 2P', monospace;
    --font-sans: 'Outfit', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-color);
    font-family: var(--font-sans);
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    background: radial-gradient(circle at center, #0f1c16 0%, #03060a 100%);
}

#game-container {
    position: relative;
    width: 95%;
    max-width: 1000px;
    aspect-ratio: 16 / 9;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.85),
                0 0 35px rgba(132, 204, 22, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

#game-container:fullscreen {
    width: 100vw !important;
    height: 100vh !important;
    max-width: none !important;
    max-height: none !important;
    border-radius: 0 !important;
    border: none !important;
}

#game-container:-webkit-full-screen {
    width: 100vw !important;
    height: 100vh !important;
    max-width: none !important;
    max-height: none !important;
    border-radius: 0 !important;
    border: none !important;
}

#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
    background-color: #0b1411;
}

/* Heads Up Display (HUD) */
#hud {
    position: absolute;
    top: 15px;
    left: 0;
    width: 100%;
    padding: 0 25px;
    display: flex;
    justify-content: space-between;
    pointer-events: none;
    z-index: 10;
}

.hud-item {
    background: rgba(8, 14, 12, 0.7);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 6px 14px;
    display: flex;
    flex-direction: column;
    align-items: center;
    backdrop-filter: blur(8px);
}

.hud-btn {
    justify-content: center;
    cursor: pointer;
    color: var(--text-muted);
    pointer-events: auto;
    transition: all 0.2s ease;
}

.hud-btn:hover {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.1);
}

.hud-label {
    font-family: var(--font-pixel);
    font-size: 7px;
    color: var(--text-muted);
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.hud-value {
    font-family: var(--font-pixel);
    font-size: 13px;
    font-weight: bold;
    color: var(--neon-green);
    text-shadow: 0 0 8px rgba(132, 204, 22, 0.4);
}

/* Menus and Overlays */
.overlay {
    position: absolute;
    inset: 0;
    background: rgba(3, 6, 8, 0.85);
    backdrop-filter: blur(12px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    transition: opacity 0.3s ease;
}

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

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 2.2rem;
    width: 90%;
    max-width: 460px;
    text-align: center;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
    animation: zoom-in 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.border-red {
    border-color: rgba(239, 68, 68, 0.3);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5),
                0 0 20px rgba(239, 68, 68, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

@keyframes zoom-in {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.logo {
    font-family: var(--font-pixel);
    font-size: 1.8rem;
    color: #fff;
    margin-bottom: 0.5rem;
    letter-spacing: 2px;
    text-shadow: 0 0 12px rgba(132, 204, 22, 0.7);
}

.tagline {
    font-size: 0.95rem;
    color: var(--neon-green);
    margin-bottom: 1.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.controls-card {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 12px;
    padding: 1.2rem;
    margin-bottom: 1.8rem;
    text-align: left;
    box-shadow: inset 0 2px 8px rgba(0,0,0,0.5);
}

.controls-card p {
    font-size: 0.85rem;
    color: var(--text-color);
    margin-bottom: 0.6rem;
    line-height: 1.5;
}

.controls-card p:last-child {
    margin-bottom: 0;
}

.key {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    padding: 2px 6px;
    font-family: var(--font-pixel);
    font-size: 8px;
    color: #fff;
}

.btn {
    width: 100%;
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-family: var(--font-pixel);
    font-size: 10px;
    letter-spacing: 1px;
    color: #fff;
    background: linear-gradient(135deg, var(--neon-green) 0%, rgba(12, 18, 28, 0.9) 100%);
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(132, 204, 22, 0.3);
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(132, 204, 22, 0.55);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-restart {
    background: linear-gradient(135deg, #10b981 0%, rgba(12, 18, 28, 0.9) 100%);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-restart:hover {
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.55);
}

.btn-share {
    background: linear-gradient(135deg, var(--neon-purple) 0%, rgba(12, 18, 28, 0.9) 100%);
    box-shadow: 0 4px 15px rgba(157, 78, 221, 0.3);
}

.btn-share:hover {
    box-shadow: 0 8px 25px rgba(157, 78, 221, 0.55);
}

.btn-back {
    display: block;
    text-decoration: none;
    background: rgba(255, 255, 255, 0.05);
    box-shadow: none;
    margin-top: 10px;
    text-align: center;
}

.btn-back:hover {
    background: rgba(255, 255, 255, 0.1);
    box-shadow: none;
}

.btn-group {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.btn-group .btn {
    flex: 1;
}

.gameover-title {
    font-family: var(--font-pixel);
    font-size: 2rem;
    color: #ef4444;
    text-shadow: 0 0 10px rgba(239, 68, 68, 0.5);
    margin-bottom: 0.5rem;
}

.gameover-desc {
    font-size: 0.9rem;
    color: var(--text-color);
    margin-bottom: 1.8rem;
    line-height: 1.5;
}

.scores-row {
    display: flex;
    gap: 15px;
    margin-bottom: 1.8rem;
}

.score-card {
    flex: 1;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 12px;
    padding: 0.8rem;
}

.score-card span {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 4px;
}

.score-card strong {
    font-family: var(--font-pixel);
    font-size: 1.2rem;
    color: #fff;
}

.stats-footer {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 1.2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 0.8rem;
}