/* Theme Variables Matrix */
:root[data-theme="dark"] {
    --bg-glow: #0a0a12;
    --surface-panel: rgba(20, 20, 35, 0.85);
    --canvas-bg: #05050a;
    --canvas-border: rgba(0, 242, 254, 0.4);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --hud-bg: #141423;
    --neon-blue: #00f2fe;
    --neon-pink: #ff007f;
    --paddle-color: #00f2fe;
}

:root[data-theme="light"] {
    --bg-glow: #e2e8f0;
    --surface-panel: #ffffff;
    --canvas-bg: #f8fafc;
    --canvas-border: #64748b;
    --text-main: #0f172a;
    --text-muted: #475569;
    --hud-bg: #f1f5f9;
    --neon-blue: #0284c7;
    --neon-pink: #db2777;
    --paddle-color: #0284c7;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    user-select: none;
    touch-action: none;
}

body {
    background-color: var(--bg-glow);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-main);
    overflow: hidden;
    transition: background-color 0.3s ease;
    padding: 10px;
}

.game-wrapper {
    position: relative;
    background: var(--surface-panel);
    border: 2px solid var(--canvas-border);
    border-radius: 24px;
    padding: 15px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    width: 100%;
    max-width: 840px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* HUD Display Dashboard Header */
.hud-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    background: var(--hud-bg);
    padding: 10px 15px;
    border-radius: 14px;
    border: 1px solid rgba(0,0,0,0.05);
    flex-wrap: wrap;
    gap: 10px;
    transition: background-color 0.3s ease;
}

.hud-stats-group {
    display: flex;
    gap: 20px;
}

.hud-stat {
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: 1px;
    text-transform: uppercase;
}
.hud-stat span {
    color: var(--neon-blue);
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.2rem;
}

.toggles-group {
    display: flex;
    gap: 15px;
    align-items: center;
}

/* Modernized Toggle Switches */
.toggle-item {
    display: flex;
    align-items: center;
    gap: 6px;
}
.theme-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 22px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #64748b;
    transition: .4s;
    border-radius: 34px;
}
.slider:before {
    position: absolute;
    content: "";
    height: 14px; width: 14px;
    left: 4px; bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}
input:checked + .slider { background-color: var(--neon-blue); }
input:checked + .slider:before { transform: translateX(22px); }

/* Canvas Arena CONTAINER */
.canvas-container {
    position: relative;
    width: 100%;
}

canvas {
    background-color: var(--canvas-bg);
    border: 3px solid var(--canvas-border);
    border-radius: 16px;
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 800 / 500;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Screen Menu Overlays */
.screen-overlay {
    position: absolute;
    top: 3px; left: 3px; right: 3px; bottom: 3px;
    border-radius: 14px;
    background-color: rgba(5, 5, 10, 0.9);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10;
    padding: 20px;
}
:root[data-theme="light"] .screen-overlay {
    background-color: rgba(255, 255, 255, 0.95);
}

.screen-overlay h1 {
    font-size: calc(1.8rem + 2vw);
    font-weight: 900;
    letter-spacing: -1px;
    margin-bottom: 8px;
    background: linear-gradient(to right, var(--neon-blue), var(--neon-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
}

.screen-overlay p {
    font-size: calc(0.85rem + 0.2vw);
    color: var(--text-muted);
    margin-bottom: 20px;
    text-align: center;
    max-width: 500px;
}

.btn-action {
    background: linear-gradient(135deg, var(--neon-blue), #4f46e5);
    color: white;
    border: none;
    padding: 12px 36px;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(0, 242, 254, 0.2);
    transition: transform 0.1s, box-shadow 0.2s;
}
.btn-action:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 25px rgba(0, 242, 254, 0.3);
}