/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a35;
    --bg-card: rgba(30, 30, 60, 0.8);
    --text-primary: #ffffff;
    --text-secondary: #a0a0c0;
    --accent-cyan: #00d4ff;
    --accent-magenta: #ff00aa;
    --accent-green: #00ff88;
    --accent-yellow: #ffcc00;
    --accent-red: #ff4466;
    --gradient-primary: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta));
    --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.3);
    --border-radius: 16px;
    --transition: all 0.3s ease;
}

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

html,
body {
    height: 100%;
    overflow: hidden;
    touch-action: manipulation;
}

body {
    font-family: 'Outfit', sans-serif;
    background: var(--bg-primary);
    background-image:
        radial-gradient(ellipse at top, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at bottom, rgba(255, 0, 170, 0.1) 0%, transparent 50%);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
}

/* ===== Container ===== */
.container {
    width: 100%;
    height: 100%;
    max-width: 480px;
    position: relative;
    overflow: hidden;
}

/* ===== Screen States ===== */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    flex-direction: column;
}

.screen.active {
    display: flex;
}

.screen.overlay {
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    justify-content: center;
    align-items: center;
    z-index: 100;
}

/* ===== Menu Screen ===== */
.menu-content {
    padding: 40px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: 24px;
}

.game-title {
    font-size: 3rem;
    font-weight: 700;
    text-align: center;
    letter-spacing: 4px;
}

.game-title .ping {
    color: var(--accent-cyan);
    text-shadow: 0 0 20px var(--accent-cyan);
}

.game-title .pong {
    color: var(--accent-magenta);
    text-shadow: 0 0 20px var(--accent-magenta);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    letter-spacing: 2px;
    margin-top: -16px;
}

/* ===== Difficulty Section ===== */
.difficulty-section {
    width: 100%;
    text-align: center;
    margin: 16px 0;
}

.difficulty-section h2 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-weight: 400;
}

.difficulty-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.diff-btn {
    flex: 1;
    max-width: 100px;
    padding: 16px 12px;
    background: var(--bg-card);
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.diff-btn:hover,
.diff-btn:active {
    transform: translateY(-2px);
    background: rgba(30, 30, 60, 1);
}

.diff-btn.active {
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-glow);
}

.diff-btn[data-difficulty="easy"].active {
    border-color: var(--accent-green);
    box-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
}

.diff-btn[data-difficulty="medium"].active {
    border-color: var(--accent-yellow);
    box-shadow: 0 0 20px rgba(255, 204, 0, 0.3);
}

.diff-btn[data-difficulty="hard"].active {
    border-color: var(--accent-red);
    box-shadow: 0 0 20px rgba(255, 68, 102, 0.3);
}

.diff-icon {
    font-size: 1.5rem;
}

.diff-label {
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 600;
}

/* ===== Speed Section ===== */
.speed-section {
    width: 100%;
    text-align: center;
    margin: 8px 0;
}

.speed-section h2 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 400;
}

.speed-control {
    display: flex;
    align-items: center;
    gap: 12px;
    justify-content: center;
    padding: 0 16px;
}

.speed-icon {
    font-size: 1.2rem;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    max-width: 200px;
    height: 8px;
    background: var(--bg-card);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
    transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.7);
}

input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.speed-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 10px;
}

#speed-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-cyan);
    min-width: 60px;
}

.reset-btn {
    padding: 6px 12px;
    font-size: 0.8rem;
    font-family: inherit;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--text-secondary);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.reset-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-primary);
}

/* ===== Buttons ===== */
.primary-btn {
    width: 100%;
    max-width: 280px;
    padding: 18px 32px;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: inherit;
    color: var(--bg-primary);
    background: var(--gradient-primary);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: var(--shadow-glow);
}

.primary-btn:hover,
.primary-btn:active {
    transform: scale(1.02);
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.5);
}

.secondary-btn {
    width: 100%;
    max-width: 280px;
    padding: 16px 32px;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-card);
    border: 2px solid var(--text-secondary);
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.secondary-btn:hover,
.secondary-btn:active {
    background: rgba(50, 50, 80, 0.8);
    border-color: var(--text-primary);
}

.icon-btn {
    width: 48px;
    height: 48px;
    font-size: 1.5rem;
    background: var(--bg-card);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.icon-btn:active {
    transform: scale(0.95);
}

/* ===== Instructions ===== */
.instructions {
    margin-top: 16px;
    padding: 16px 24px;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    text-align: center;
}

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

/* ===== Game Screen ===== */
.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: var(--bg-secondary);
}

.score-display {
    display: flex;
    align-items: center;
    gap: 16px;
}

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

.score-label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    letter-spacing: 1px;
}

.score-value {
    font-size: 2rem;
    font-weight: 700;
}

.ai-score .score-value {
    color: var(--accent-magenta);
}

.player-score .score-value {
    color: var(--accent-cyan);
}

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

#game-canvas {
    flex: 1;
    width: 100%;
    display: block;
    touch-action: none;
}

.touch-hint {
    padding: 12px;
    background: var(--bg-secondary);
    text-align: center;
}

.touch-hint p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ===== Modal ===== */
.modal {
    background: var(--bg-card);
    padding: 40px 32px;
    border-radius: 24px;
    text-align: center;
    max-width: 320px;
    width: 90%;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.modal h2 {
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.modal-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
}

.final-score {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 32px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== Animations ===== */
@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.game-title {
    animation: float 3s ease-in-out infinite;
}

/* ===== Responsive ===== */
@media (max-height: 600px) {
    .menu-content {
        padding: 20px 16px;
        gap: 16px;
    }

    .game-title {
        font-size: 2.5rem;
    }

    .difficulty-section {
        margin: 8px 0;
    }

    .diff-btn {
        padding: 12px 8px;
    }

    .primary-btn {
        padding: 14px 24px;
    }

    .instructions {
        margin-top: 8px;
        padding: 12px 16px;
    }
}

@media (min-width: 481px) {
    .container {
        border-radius: 24px;
        max-height: 800px;
        box-shadow:
            0 0 60px rgba(0, 212, 255, 0.2),
            0 0 100px rgba(255, 0, 170, 0.1);
        overflow: hidden;
    }
}