/* Ping Pong - Arcade Style CSS */
/* Inspired by Plane Battle design system */

/* CSS Variables for consistent palette */
:root {
    --bg-dark: #0a0a1a;
    --bg-panel: rgba(20, 25, 40, 0.9);
    --accent-cyan: #00d4ff;
    --accent-blue: #4a9eff;
    --accent-purple: #b347d9;
    --accent-pink: #ff6b9d;
    --accent-green: #00ff88;
    --accent-red: #ff4757;
    --text-primary: #ffffff;
    --text-secondary: #a0a8c0;
    --border-glow: rgba(0, 212, 255, 0.5);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

/* Reset and base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Exo 2', 'Segoe UI', sans-serif;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(0, 212, 255, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(179, 71, 217, 0.15) 0%, transparent 50%),
        linear-gradient(135deg, var(--bg-dark) 0%, #0f1420 50%, #0a0f1a 100%);
    animation: bgPulse 8s ease-in-out infinite;
}

@keyframes bgPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.95; }
}

/* Game Container */
#gameContainer {
    text-align: center;
    width: 100%;
    max-width: 900px;
    padding: 20px;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Title Styling */
#gameTitle {
    font-family: 'Orbitron', sans-serif;
    font-size: 48px;
    font-weight: 900;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 50%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px rgba(0, 212, 255, 0.5);
    letter-spacing: 8px;
    text-transform: uppercase;
    animation: titleGlow 3s ease-in-out infinite;
}

@keyframes titleGlow {
    0%, 100% { filter: brightness(1) drop-shadow(0 0 20px rgba(0, 212, 255, 0.8)); }
    50% { filter: brightness(1.2) drop-shadow(0 0 40px rgba(0, 212, 255, 1)); }
}

/* HUD Panel */
#hudPanel {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    margin-bottom: 15px;
    padding: 12px 30px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.scoreBox {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.scoreLabel {
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 2px;
}

.scoreValue {
    font-family: 'Orbitron', sans-serif;
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    text-shadow: 0 0 20px currentColor;
}

.scoreValue.player { color: var(--accent-cyan); }
.scoreValue.computer { color: var(--accent-pink); }

.scoreDivider {
    font-family: 'Orbitron', sans-serif;
    font-size: 24px;
    color: var(--text-secondary);
    opacity: 0.5;
}

/* Winner Display */
#winner {
    font-family: 'Orbitron', sans-serif;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 15px;
    min-height: 40px;
    text-transform: uppercase;
    letter-spacing: 4px;
    animation: winnerPulse 1.5s ease-in-out infinite;
}

#winner.playerWin {
    color: var(--accent-green);
    text-shadow: 0 0 30px var(--accent-green), 0 0 60px var(--accent-green);
}

#winner.computerWin {
    color: var(--accent-red);
    text-shadow: 0 0 30px var(--accent-red), 0 0 60px var(--accent-red);
}

@keyframes winnerPulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.9; }
}

/* Canvas */
#gameCanvas {
    border: 2px solid var(--accent-cyan);
    border-radius: 12px;
    background: #0a0a15;
    max-width: 100%;
    height: auto;
    touch-action: none;
    box-shadow: 
        0 0 0 1px rgba(0, 212, 255, 0.3),
        0 0 30px rgba(0, 212, 255, 0.2),
        0 10px 50px rgba(0, 0, 0, 0.5);
    transition: box-shadow 0.3s ease;
}

#gameCanvas:hover {
    box-shadow: 
        0 0 0 1px rgba(0, 212, 255, 0.5),
        0 0 50px rgba(0, 212, 255, 0.3),
        0 10px 50px rgba(0, 0, 0, 0.5);
}

/* Menu Card */
.menuCard {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 40px 60px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    animation: cardFloat 4s ease-in-out infinite;
}

@keyframes cardFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.difficultyDisplay {
    font-size: 14px;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin: 20px 0;
    padding: 10px 20px;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 25px;
    display: inline-block;
}

/* Buttons */
.btn {
    font-family: 'Orbitron', sans-serif;
    font-size: 16px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    padding: 15px 40px;
    margin: 10px;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
    color: #000;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.6);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: var(--glass-bg);
    color: var(--text-primary);
    border-color: var(--accent-cyan);
}

/* Key Badges */
.keyBadge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    padding: 0 10px;
    background: linear-gradient(180deg, #3a3a5a 0%, #2a2a4a 100%);
    border: 1px solid #4a4a6a;
    border-radius: 6px;
    font-family: 'Orbitron', sans-serif;
    font-size: 12px;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    box-shadow: 
        0 4px 0 #1a1a2a,
        0 5px 10px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    margin: 0 3px;
    transition: all 0.1s ease;
}

.keyBadge:active {
    transform: translateY(4px);
    box-shadow: 
        0 0 0 #1a1a2a,
        0 1px 5px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

/* Controls Panel */
#controlsPanel {
    margin-top: 20px;
    padding: 15px 25px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    align-items: center;
}

.controlGroup {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Touch Controls */
#touchControls {
    display: none;
    margin-top: 20px;
}

.touchZone {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding: 15px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
}

.touchArea {
    flex: 1;
    padding: 20px;
    background: rgba(255, 255, 255, 0.03);
    border: 2px dashed rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.touchArea.active {
    border-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.1);
}

/* Mobile Styles */
@media (max-width: 850px) {
    #gameContainer {
        padding: 10px;
    }
    
    #gameTitle {
        font-size: 32px;
        letter-spacing: 4px;
    }
    
    #hudPanel {
        padding: 10px 20px;
        gap: 20px;
    }
    
    .scoreValue {
        font-size: 24px;
    }
    
    .menuCard {
        padding: 30px 40px;
    }
    
    .btn {
        padding: 12px 30px;
        font-size: 14px;
    }
}

@media (hover: none) and (pointer: coarse) {
    #controlsPanel {
        display: none;
    }
    
    #touchControls {
        display: block;
    }
}

/* Utility */
.hidden {
    display: none !important;
}

.fadeIn {
    animation: fadeIn 0.5s ease-out;
}

.fadeOut {
    animation: fadeOut 0.3s ease-out forwards;
}

@keyframes fadeOut {
    to { opacity: 0; transform: translateY(-10px); }
}