/* ==========================================================================
   CYBERPONG - DESIGN SYSTEM & STYLESHEET
   ========================================================================== */

:root {
    /* Color Palette - Default Cyber Neon */
    --bg-dark: #080b12;
    --bg-card: rgba(16, 23, 42, 0.75);
    --border-glow: rgba(0, 240, 255, 0.4);
    --primary-cyan: #00f0ff;
    --primary-magenta: #ff007f;
    --accent-yellow: #ffe600;
    --accent-green: #00ff66;
    --text-main: #f0f6fc;
    --text-muted: #8b949e;

    /* Theme-dependent Canvas Palette */
    --canvas-bg: #0b0e17;
    --p1-color: #00f0ff;
    --p2-color: #ff007f;
    --ball-color: #ffffff;
    --grid-color: rgba(0, 240, 255, 0.08);

    /* Fonts & Radii */
    --font-heading: 'Orbitron', sans-serif;
    --font-body: 'Rajdhani', sans-serif;
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    /* Shadows & Glows */
    --glow-cyan: 0 0 15px rgba(0, 240, 255, 0.6);
    --glow-magenta: 0 0 15px rgba(ff, 0, 127, 0.6);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.7);
}

/* Theme Variations */
[data-theme="synthwave"] {
    --bg-dark: #12091c;
    --bg-card: rgba(30, 12, 48, 0.8);
    --border-glow: rgba(255, 110, 199, 0.5);
    --primary-cyan: #ff71ce;
    --primary-magenta: #05ffa1;
    --accent-yellow: #ffb800;
    --canvas-bg: #180928;
    --p1-color: #ff71ce;
    --p2-color: #05ffa1;
    --grid-color: rgba(255, 113, 206, 0.1);
}

[data-theme="matrix"] {
    --bg-dark: #020d04;
    --bg-card: rgba(5, 26, 10, 0.85);
    --border-glow: rgba(0, 255, 102, 0.5);
    --primary-cyan: #00ff66;
    --primary-magenta: #33ff99;
    --accent-yellow: #ccff00;
    --canvas-bg: #031406;
    --p1-color: #00ff66;
    --p2-color: #33ff99;
    --grid-color: rgba(0, 255, 102, 0.1);
}

[data-theme="classic"] {
    --bg-dark: #0a0a0a;
    --bg-card: rgba(20, 20, 20, 0.9);
    --border-glow: rgba(255, 255, 255, 0.3);
    --primary-cyan: #ffffff;
    --primary-magenta: #cccccc;
    --accent-yellow: #ffffff;
    --canvas-bg: #000000;
    --p1-color: #ffffff;
    --p2-color: #ffffff;
    --grid-color: rgba(255, 255, 255, 0.05);
}

/* Global Reset */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 16px;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    background-image: 
        radial-gradient(circle at 15% 15%, rgba(0, 240, 255, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 85% 85%, rgba(255, 0, 127, 0.05) 0%, transparent 40%);
}

#gameContainer {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 1100px;
    height: 96vh;
    padding: 10px;
    gap: 12px;
}

/* HUD Top Header */
.hud-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: 10px 24px;
    box-shadow: var(--glass-shadow);
}

.hud-player {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 180px;
}

.hud-p1 {
    justify-content: flex-start;
}

.hud-p2 {
    justify-content: flex-end;
}

.player-label {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 0.95rem;
    letter-spacing: 2px;
}

.hud-p1 .player-label {
    color: var(--primary-cyan);
    text-shadow: var(--glow-cyan);
}

.hud-p2 .player-label {
    color: var(--primary-magenta);
    text-shadow: var(--glow-magenta);
}

.score-display {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 900;
    line-height: 1;
}

.hud-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.brand-title {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 900;
    letter-spacing: 3px;
    background: linear-gradient(90deg, var(--primary-cyan), var(--primary-magenta));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.mode-badge {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.05);
    padding: 2px 10px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.hud-controls {
    display: flex;
    gap: 8px;
}

.icon-btn {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--text-main);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--primary-cyan);
    transform: translateY(-2px);
    box-shadow: var(--glow-cyan);
}

/* Canvas Area */
.canvas-wrapper {
    position: relative;
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 25px rgba(0, 0, 0, 0.8);
    background: var(--canvas-bg);
}

canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

/* Screen Shake Effect */
#screenShakeOverlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.shake {
    animation: shakeAnim 0.3s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}

@keyframes shakeAnim {
    10%, 90% { transform: translate3d(-2px, 0, 0); }
    20%, 80% { transform: translate3d(4px, 0, 0); }
    30%, 50%, 70% { transform: translate3d(-6px, 0, 0); }
    40%, 60% { transform: translate3d(6px, 0, 0); }
}

/* Screen Overlays (Menu, Pause, Victory) */
.screen-overlay {
    position: absolute;
    inset: 0;
    background: rgba(8, 11, 18, 0.85);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.screen-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.screen-overlay.hidden {
    display: none;
}

/* Glass Card Component */
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-lg);
    padding: 32px 40px;
    box-shadow: var(--glass-shadow), 0 0 30px rgba(0, 240, 255, 0.15);
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 90%;
    max-width: 540px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.menu-card {
    max-width: 580px;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 2.8rem;
    font-weight: 900;
    letter-spacing: 6px;
    margin-bottom: 2px;
}

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

.tagline {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

/* Menu Settings Layout */
.menu-sections {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin-bottom: 24px;
}

.setting-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    width: 100%;
}

.setting-label {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--primary-cyan);
}

.btn-grid {
    display: flex;
    width: 100%;
    gap: 8px;
}

.btn-option {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--text-muted);
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 10px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-option:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
}

.btn-option.active {
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.2), rgba(255, 0, 127, 0.2));
    border-color: var(--primary-cyan);
    color: #ffffff;
    box-shadow: var(--glow-cyan);
}

.inline-settings {
    flex-direction: row;
    justify-content: space-between;
    gap: 16px;
}

.setting-sub {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
}

.cyber-select {
    width: 100%;
    background: rgba(10, 15, 26, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-main);
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 10px;
    border-radius: var(--radius-sm);
    outline: none;
    cursor: pointer;
}

.cyber-select:focus {
    border-color: var(--primary-cyan);
    box-shadow: var(--glow-cyan);
}

/* Audio Settings & Sliders */
.audio-settings {
    flex-direction: row;
    gap: 16px;
}

.slider-label-row {
    display: flex;
    justify-content: space-between;
    width: 100%;
    align-items: center;
}

.vol-value {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    color: var(--primary-cyan);
    font-weight: 700;
}

.slider-row {
    display: flex;
    width: 100%;
    gap: 8px;
    align-items: center;
}

.cyber-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 3px;
    outline: none;
}

.cyber-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary-cyan);
    cursor: pointer;
    box-shadow: var(--glow-cyan);
    transition: transform 0.15s ease;
}

.cyber-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.btn-small {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-muted);
    font-family: var(--font-heading);
    font-size: 0.65rem;
    font-weight: 800;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-small:hover {
    background: rgba(255, 255, 255, 0.2);
    color: #ffffff;
}

.btn-small.muted {
    background: rgba(255, 0, 70, 0.25);
    border-color: #ff3366;
    color: #ff3366;
}

/* Controls Hint Box */
.controls-hint {
    display: flex;
    justify-content: space-around;
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.hint-col {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.hint-title {
    font-family: var(--font-heading);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--primary-cyan);
    margin-right: 4px;
}

.key-badge {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-main);
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 800;
    padding: 2px 6px;
    border-radius: 4px;
    border-bottom: 2px solid rgba(255, 255, 255, 0.4);
}

/* Buttons */
.btn-primary {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-cyan), var(--primary-magenta));
    border: none;
    color: #ffffff;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 900;
    letter-spacing: 3px;
    padding: 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.25s ease;
    box-shadow: 0 4px 20px rgba(0, 240, 255, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(255, 0, 127, 0.6);
}

.btn-secondary {
    width: 100%;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-main);
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    padding: 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.18);
    border-color: var(--primary-cyan);
}

.btn-danger {
    width: 100%;
    background: rgba(255, 0, 70, 0.2);
    border: 1px solid rgba(255, 0, 70, 0.4);
    color: #ff3366;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    padding: 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-danger:hover {
    background: rgba(255, 0, 70, 0.4);
    box-shadow: 0 0 15px rgba(255, 0, 70, 0.5);
}

.pause-card, .result-card {
    gap: 20px;
}

.pause-card h2, .winner-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    letter-spacing: 4px;
}

.victory-banner {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 4px;
    color: var(--accent-yellow);
}

.final-score {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--primary-cyan);
    text-shadow: var(--glow-cyan);
}

.pause-actions, .result-actions {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Active Power-up HUD Overlay */
.powerup-hud {
    position: absolute;
    bottom: 15px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(10, 15, 26, 0.85);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(0, 240, 255, 0.3);
    border-radius: 30px;
    padding: 6px 18px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 5;
}

.powerup-title {
    font-family: var(--font-heading);
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--accent-yellow);
    letter-spacing: 1px;
}

.powerup-list {
    display: flex;
    gap: 8px;
}

.powerup-badge {
    background: rgba(255, 255, 255, 0.1);
    font-size: 0.85rem;
    padding: 2px 8px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popIn {
    0% { transform: scale(0); }
    100% { transform: scale(1); }
}

/* Footer */
.footer-bar {
    display: flex;
    justify-content: center;
    gap: 30px;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 1px;
}

/* Active Icon Button Highlight */
.icon-btn.active {
    background: rgba(0, 240, 255, 0.25);
    border-color: var(--primary-cyan);
    box-shadow: var(--glow-cyan);
}

/* On-Screen Mobile / Phone Controls Overlay */
.mobile-controls-overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 8;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.mobile-controls-overlay.active {
    opacity: 1;
}

.touch-zone {
    display: flex;
    flex-direction: column;
    gap: 18px;
    pointer-events: auto;
    touch-action: none;
}

.touch-btn {
    width: 68px;
    height: 68px;
    border-radius: 50%;
    background: rgba(16, 23, 42, 0.7);
    backdrop-filter: blur(8px);
    border: 2px solid var(--primary-cyan);
    color: var(--primary-cyan);
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.6), var(--glow-cyan);
    transition: transform 0.1s ease, background-color 0.1s ease, box-shadow 0.1s ease;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
}

.touch-btn:active, .touch-btn.pressed {
    transform: scale(0.92);
    background: var(--primary-cyan);
    color: #080b12;
    box-shadow: 0 0 25px var(--primary-cyan);
}

.p2-touch-zone .touch-btn {
    border-color: var(--primary-magenta);
    color: var(--primary-magenta);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.6), var(--glow-magenta);
}

.p2-touch-zone .touch-btn:active, .p2-touch-zone .touch-btn.pressed {
    background: var(--primary-magenta);
    color: #080b12;
    box-shadow: 0 0 25px var(--primary-magenta);
}

.touch-serve {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: auto;
    height: auto;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-cyan), var(--primary-magenta));
    color: #ffffff;
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 800;
    letter-spacing: 2px;
    border: none;
    box-shadow: 0 4px 20px rgba(0, 240, 255, 0.6);
    pointer-events: auto;
    animation: pulseServe 1.5s infinite ease-in-out;
}

@keyframes pulseServe {
    0%, 100% { transform: translateX(-50%) scale(1); }
    50% { transform: translateX(-50%) scale(1.06); }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    #gameContainer {
        height: 100vh;
        padding: 6px;
        gap: 6px;
    }
    .glass-card {
        padding: 20px 20px;
    }
    .logo-text {
        font-size: 2rem;
    }
    .hud-bar {
        padding: 6px 12px;
    }
    .hud-player {
        min-width: auto;
    }
    .player-label {
        font-size: 0.7rem;
    }
    .score-display {
        font-size: 1.5rem;
    }
    .controls-hint {
        flex-direction: column;
        gap: 6px;
    }
    .touch-btn {
        width: 60px;
        height: 60px;
        font-size: 1.4rem;
    }
    .mobile-controls-overlay {
        padding: 10px;
    }
}