/* =============================================
   NEON PONG - Main Stylesheet
   Synthwave Retro Aesthetic
   ============================================= */

/* CSS Variables */
:root {
    /* Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --neon-pink: #ff00ff;
    --neon-pink-light: #ff2d95;
    --neon-cyan: #00ffff;
    --neon-cyan-light: #00f5ff;
    --neon-purple: #bf00ff;
    --neon-purple-light: #9d00ff;
    --electric-blue: #0080ff;
    --hot-orange: #ff6600;
    --grid-color: #330033;
    --text-primary: #ffffff;
    --text-secondary: #aaaaaa;
    
    /* Difficulty Colors */
    --diff-easy: #00ff00;
    --diff-medium: #ffff00;
    --diff-hard: #ff6600;
    --diff-impossible: #ff0000;
    
    /* Glow Effects */
    --glow-pink: 0 0 10px #ff00ff, 0 0 20px #ff00ff, 0 0 40px #ff00ff;
    --glow-cyan: 0 0 10px #00ffff, 0 0 20px #00ffff, 0 0 40px #00ffff;
    --glow-purple: 0 0 10px #bf00ff, 0 0 20px #bf00ff, 0 0 40px #bf00ff;
    
    /* Typography */
    --font-display: 'Orbitron', sans-serif;
    --font-pixel: 'Press Start 2P', cursive;
    
    /* Spacing */
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    touch-action: none;
}

body {
    font-family: var(--font-display);
    background: var(--bg-primary);
    color: var(--text-primary);
    user-select: none;
    -webkit-user-select: none;
}

/* Prevent iOS bounce scroll */
html {
    position: fixed;
    overflow: hidden;
}

/* Screen Management */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--safe-area-top) var(--safe-area-right) var(--safe-area-bottom) var(--safe-area-left);
    background: var(--bg-primary);
    z-index: 10;
}

.screen.active {
    display: flex;
}

.screen.overlay {
    background: rgba(10, 10, 10, 0.95);
    z-index: 100;
}

/* Grid Background */
.grid-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(to bottom, 
            transparent 0%, 
            rgba(26, 26, 46, 0.5) 50%, 
            var(--bg-secondary) 100%),
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 100% 100%, 40px 40px, 40px 40px;
    perspective: 500px;
    transform-style: preserve-3d;
    z-index: -1;
    opacity: 0.6;
}

.grid-background::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    transform: rotateX(60deg);
    transform-origin: bottom;
}

/* Typography */
.neon-text {
    text-shadow: var(--glow-pink);
    color: var(--neon-pink);
}

.neon-text.cyan {
    text-shadow: var(--glow-cyan);
    color: var(--neon-cyan);
}

.neon-text.purple {
    text-shadow: var(--glow-purple);
    color: var(--neon-purple);
}

.game-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 10vw, 4rem);
    font-weight: 900;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: 0.5em;
}

.subtitle {
    font-family: var(--font-pixel);
    font-size: clamp(0.5rem, 2.5vw, 0.8rem);
    color: var(--neon-cyan);
    text-shadow: var(--glow-cyan);
    letter-spacing: 0.3em;
    margin-bottom: 2em;
}

.menu-title {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 6vw, 2.5rem);
    font-weight: 700;
    letter-spacing: 0.15em;
    margin-bottom: 1.5em;
}

/* Buttons */
.btn {
    font-family: var(--font-display);
    font-size: clamp(0.8rem, 3vw, 1rem);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-primary);
    background: transparent;
    border: 2px solid var(--neon-pink);
    border-radius: 8px;
    padding: 1em 2em;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 0, 255, 0.3), transparent);
    transition: left var(--transition-normal);
}

.btn:hover::before,
.btn:active::before {
    left: 100%;
}

.btn:hover,
.btn:active {
    background: rgba(255, 0, 255, 0.2);
    box-shadow: var(--glow-pink);
    transform: scale(1.02);
}

.btn-primary {
    background: linear-gradient(135deg, var(--neon-pink) 0%, var(--neon-purple) 100%);
    border: none;
    box-shadow: var(--glow-pink);
}

.btn-primary:hover,
.btn-primary:active {
    background: linear-gradient(135deg, var(--neon-pink-light) 0%, var(--neon-purple-light) 100%);
}

.btn-menu {
    width: 100%;
    max-width: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3em;
    margin-bottom: 0.8em;
    padding: 1.2em 1.5em;
}

.btn-menu .btn-icon {
    font-size: 1.5em;
    margin-bottom: 0.2em;
}

.btn-menu .btn-subtitle {
    font-size: 0.6em;
    color: var(--text-secondary);
    font-weight: 400;
    letter-spacing: 0.05em;
}

.btn-back {
    margin-top: 2em;
    font-size: 0.8rem;
    padding: 0.8em 1.5em;
    border-color: var(--neon-cyan);
}

.btn-back:hover {
    border-color: var(--neon-cyan);
    background: rgba(0, 255, 255, 0.2);
    box-shadow: var(--glow-cyan);
}

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 1.2rem;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-quit {
    border-color: var(--hot-orange);
}

.btn-quit:hover {
    background: rgba(255, 102, 0, 0.2);
    box-shadow: 0 0 10px var(--hot-orange), 0 0 20px var(--hot-orange);
}

/* Difficulty buttons */
.btn-easy { border-color: var(--diff-easy); }
.btn-easy:hover { background: rgba(0, 255, 0, 0.2); box-shadow: 0 0 20px var(--diff-easy); }
.btn-medium { border-color: var(--diff-medium); }
.btn-medium:hover { background: rgba(255, 255, 0, 0.2); box-shadow: 0 0 20px var(--diff-medium); }
.btn-hard { border-color: var(--diff-hard); }
.btn-hard:hover { background: rgba(255, 102, 0, 0.2); box-shadow: 0 0 20px var(--diff-hard); }
.btn-impossible { border-color: var(--diff-impossible); }
.btn-impossible:hover { background: rgba(255, 0, 0, 0.2); box-shadow: 0 0 20px var(--diff-impossible); }

/* Menu Content */
.menu-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2em;
    z-index: 1;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

/* Loading Screen */
#loading-screen {
    background: var(--bg-primary);
}

.loading-content {
    text-align: center;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: var(--bg-secondary);
    border-radius: 2px;
    margin: 2em auto;
    overflow: hidden;
}

.loading-progress {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--neon-pink), var(--neon-cyan));
    border-radius: 2px;
    animation: loading 2s ease-in-out forwards;
}

@keyframes loading {
    0% { width: 0%; }
    100% { width: 100%; }
}

.loading-text {
    font-family: var(--font-pixel);
    font-size: 0.8rem;
    color: var(--text-secondary);
    animation: blink 1s infinite;
}

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

/* Title Screen */
.title-content {
    text-align: center;
    z-index: 1;
}

.tap-to-start {
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: var(--glow-pink); }
    50% { box-shadow: 0 0 20px #ff00ff, 0 0 40px #ff00ff, 0 0 60px #ff00ff; }
}

.title-footer {
    position: absolute;
    bottom: 2em;
    font-size: 0.7rem;
    color: var(--text-secondary);
}

/* Game Screen */
#game-screen {
    padding: 0;
    background: var(--bg-primary);
}

#game-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.game-hud {
    position: absolute;
    top: var(--safe-area-top);
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1em;
    z-index: 20;
}

.score-display {
    display: flex;
    align-items: center;
    gap: 0.5em;
    font-family: var(--font-pixel);
    font-size: clamp(1.2rem, 5vw, 2rem);
}

.player-score {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2em;
}

#player1-score .score-value {
    color: var(--neon-cyan);
    text-shadow: var(--glow-cyan);
}

#player2-score .score-value {
    color: var(--neon-pink);
    text-shadow: var(--glow-pink);
}

.player-label {
    font-size: 0.5em;
    color: var(--text-secondary);
}

.score-divider {
    color: var(--text-secondary);
    font-size: 1.5em;
}

.pause-btn {
    position: absolute;
    right: 1em;
    top: 50%;
    transform: translateY(-50%);
}

.game-message {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 6vw, 3rem);
    font-weight: 700;
    color: var(--neon-pink);
    text-shadow: var(--glow-pink);
    text-align: center;
    z-index: 30;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.game-message.visible {
    opacity: 1;
}

/* Touch Zones */
.touch-zones {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    z-index: 15;
    pointer-events: none;
}

.touch-zone {
    flex: 1;
    pointer-events: none;
}

.touch-zone.active {
    background: rgba(255, 255, 255, 0.05);
}

/* Game Over Screen */
.gameover-content {
    text-align: center;
    padding: 2em;
}

.winner-text {
    font-size: clamp(1.5rem, 6vw, 2.5rem);
    margin-bottom: 0.5em;
    animation: winner-pulse 0.5s ease-in-out infinite alternate;
}

@keyframes winner-pulse {
    from { transform: scale(1); }
    to { transform: scale(1.05); }
}

.final-score {
    font-family: var(--font-pixel);
    font-size: clamp(2rem, 10vw, 4rem);
    color: var(--text-primary);
    margin-bottom: 1em;
}

.final-score span:first-child { color: var(--neon-cyan); }
.final-score span:last-child { color: var(--neon-pink); }

.game-stats {
    display: flex;
    justify-content: center;
    gap: 2em;
    margin-bottom: 2em;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3em;
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.stat-value {
    font-family: var(--font-pixel);
    font-size: 1.2rem;
    color: var(--neon-cyan);
}

/* Settings Screen */
.settings-content {
    max-width: 400px;
    width: 100%;
}

.settings-group {
    width: 100%;
    margin-bottom: 1.5em;
    padding: 1em;
    background: rgba(26, 26, 46, 0.5);
    border-radius: 10px;
    border: 1px solid rgba(255, 0, 255, 0.2);
}

.setting-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.8em 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.setting-item:last-child {
    border-bottom: none;
}

.setting-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.setting-slider {
    -webkit-appearance: none;
    width: 120px;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    outline: none;
}

.setting-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--neon-pink);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--neon-pink);
}

.setting-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--neon-pink);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--neon-pink);
    border: none;
}

.setting-value {
    font-family: var(--font-pixel);
    font-size: 0.7rem;
    color: var(--neon-cyan);
    min-width: 40px;
    text-align: right;
}

.setting-description {
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.7;
    margin: 0.5em 0 0 0;
    padding: 0;
    line-height: 1.4;
}

/* Toggle Switch */
.toggle {
    position: relative;
    width: 50px;
    height: 26px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-secondary);
    border-radius: 13px;
    cursor: pointer;
    transition: var(--transition-normal);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    left: 3px;
    bottom: 3px;
    background: var(--text-secondary);
    border-radius: 50%;
    transition: var(--transition-normal);
}

.toggle input:checked + .toggle-slider {
    background: var(--neon-pink);
    box-shadow: 0 0 10px var(--neon-pink);
}

.toggle input:checked + .toggle-slider::before {
    transform: translateX(24px);
    background: white;
}

/* How to Play */
.howtoplay-content {
    max-width: 400px;
}

.instructions {
    width: 100%;
}

.instruction-item {
    display: flex;
    align-items: flex-start;
    gap: 1em;
    padding: 1em;
    margin-bottom: 1em;
    background: rgba(26, 26, 46, 0.5);
    border-radius: 10px;
    border: 1px solid rgba(0, 255, 255, 0.2);
}

.instruction-icon {
    font-size: 2rem;
}

.instruction-text h3 {
    font-size: 0.9rem;
    color: var(--neon-cyan);
    margin-bottom: 0.3em;
}

.instruction-text p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Leaderboard */
.leaderboard-content {
    max-width: 400px;
    width: 100%;
}

.leaderboard-tabs {
    display: flex;
    gap: 0.5em;
    margin-bottom: 1em;
}

.tab-btn {
    font-family: var(--font-display);
    font-size: 0.7rem;
    padding: 0.5em 1em;
    background: transparent;
    border: 1px solid var(--neon-purple);
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.tab-btn.active {
    background: var(--neon-purple);
    color: white;
    box-shadow: 0 0 10px var(--neon-purple);
}

.leaderboard-list {
    width: 100%;
    max-height: 300px;
    overflow-y: auto;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    padding: 0.8em;
    margin-bottom: 0.5em;
    background: rgba(26, 26, 46, 0.5);
    border-radius: 8px;
    border: 1px solid rgba(255, 0, 255, 0.2);
}

.leaderboard-rank {
    font-family: var(--font-pixel);
    font-size: 1rem;
    width: 40px;
    color: var(--neon-pink);
}

.leaderboard-rank.gold { color: #ffd700; }
.leaderboard-rank.silver { color: #c0c0c0; }
.leaderboard-rank.bronze { color: #cd7f32; }

.leaderboard-name {
    flex: 1;
    font-size: 0.9rem;
}

.leaderboard-score {
    font-family: var(--font-pixel);
    font-size: 0.9rem;
    color: var(--neon-cyan);
}

/* Online Lobby */
.lobby-content {
    max-width: 400px;
}

.lobby-options {
    width: 100%;
    margin-bottom: 1em;
}

.room-code-input {
    display: flex;
    gap: 0.5em;
    margin-bottom: 1em;
}

.room-code-input input {
    font-family: var(--font-pixel);
    font-size: 1rem;
    padding: 0.8em;
    background: var(--bg-secondary);
    border: 2px solid var(--neon-cyan);
    border-radius: 8px;
    color: var(--text-primary);
    text-align: center;
    text-transform: uppercase;
    width: 150px;
}

.room-code-input input:focus {
    outline: none;
    box-shadow: var(--glow-cyan);
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 0.5em;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #ff0000;
}

.status-dot.connected {
    background: #00ff00;
    box-shadow: 0 0 10px #00ff00;
}

/* Countdown Overlay */
.countdown-overlay {
    display: none;
    background: rgba(10, 10, 10, 0.8);
}

.countdown-overlay.active {
    display: flex;
}

.countdown-number {
    font-family: var(--font-pixel);
    font-size: clamp(4rem, 20vw, 8rem);
    color: var(--neon-pink);
    text-shadow: var(--glow-pink);
    animation: countdown-pop 0.5s ease-out;
}

@keyframes countdown-pop {
    0% { transform: scale(2); opacity: 0; }
    50% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(1); opacity: 1; }
}

/* Scanlines Effect */
.scanlines {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1000;
    opacity: 0.1;
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 0, 0, 0.15),
        rgba(0, 0, 0, 0.15) 1px,
        transparent 1px,
        transparent 2px
    );
}

.scanlines.disabled {
    display: none;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--neon-purple);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--neon-pink);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    pointer-events: none;
}

.toast {
    background: linear-gradient(135deg, rgba(26, 26, 46, 0.95) 0%, rgba(22, 33, 62, 0.95) 100%);
    border: 1px solid var(--neon-cyan);
    border-radius: 8px;
    padding: 15px 25px;
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: 0.9rem;
    box-shadow: 0 4px 20px rgba(0, 255, 255, 0.3), var(--glow-cyan);
    animation: toastSlideIn 0.3s ease-out forwards;
    pointer-events: auto;
    max-width: 90vw;
    text-align: center;
}

.toast.toast-error {
    border-color: var(--neon-pink);
    box-shadow: 0 4px 20px rgba(255, 0, 255, 0.3), var(--glow-pink);
}

.toast.toast-success {
    border-color: var(--diff-easy);
    box-shadow: 0 4px 20px rgba(0, 255, 0, 0.3), 0 0 10px #00ff00, 0 0 20px #00ff00;
}

.toast.toast-info {
    border-color: var(--neon-purple);
    box-shadow: 0 4px 20px rgba(191, 0, 255, 0.3), var(--glow-purple);
}

.toast.toast-exit {
    animation: toastSlideOut 0.3s ease-in forwards;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes toastSlideOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}