body { 
    margin: 0; 
    overflow: hidden; 
    background-color: #000; 
    font-family: 'Orbitron', sans-serif; 
    user-select: none; 
}
canvas { 
    display: block; 
}
#ui-layer { 
    position: absolute; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    pointer-events: none; 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    overflow: hidden;
}

/* Main Menu Styles */
#main-menu {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    pointer-events: auto;
    z-index: 100;
}

#menu-overlay-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('./assets/paddle-theme.png');
    background-size: cover;
    background-position: center;
    filter: brightness(1); /* Preserve original brightness */
}

#menu-content {
    position: relative;
    z-index: 101;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 6vh 0;
    box-sizing: border-box;
}

#start-prompt {
    font-size: clamp(2rem, 5vw, 4rem);
    color: #fff;
    font-weight: 700;
    text-shadow: 0 0 20px rgba(0,0,0,0.8), 0 0 10px rgba(255,255,255,0.4);
    letter-spacing: 5px;
    animation: pulse 2s infinite ease-in-out;
    margin-top: 15vh; /* Pushes it below center */
}

@keyframes pulse {
    0%, 100% { opacity: 0.8; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.05); }
}

/* Difficulty selector */
#difficulty-selector {
    display: flex;
    gap: 14px;
    margin-top: 28px;
    flex-wrap: wrap;
    justify-content: center;
}

.diff-btn {
    padding: 12px 26px;
    font-family: 'Orbitron', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 2px;
    border-radius: 8px;
    border: 2px solid rgba(255,255,255,0.3);
    background: rgba(0,0,0,0.65);
    color: rgba(255,255,255,0.6);
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.diff-btn:hover {
    background: rgba(255,255,255,0.15);
    color: #fff;
    transform: translateY(-2px);
}

.diff-btn.active[data-diff="easy"] {
    border-color: #44cc44;
    color: #44cc44;
    background: rgba(68,204,68,0.15);
    box-shadow: 0 0 14px rgba(68,204,68,0.4);
}

.diff-btn.active[data-diff="medium"] {
    border-color: #ffcc00;
    color: #ffcc00;
    background: rgba(255,204,0,0.15);
    box-shadow: 0 0 14px rgba(255,204,0,0.4);
}

.diff-btn.active[data-diff="hard"] {
    border-color: #ff8800;
    color: #ff8800;
    background: rgba(255,136,0,0.15);
    box-shadow: 0 0 14px rgba(255,136,0,0.4);
}

.superhuman-btn {
    border-color: rgba(255,34,68,0.5) !important;
    color: rgba(255,34,68,0.7) !important;
}

.diff-btn.active[data-diff="superhuman"] {
    border-color: #ff2244;
    color: #ff2244;
    background: rgba(255,34,68,0.15);
    box-shadow: 0 0 18px rgba(255,34,68,0.6);
    animation: redPulse 1.2s infinite ease-in-out;
}

@keyframes redPulse {
    0%, 100% { box-shadow: 0 0 14px rgba(255,34,68,0.5); }
    50% { box-shadow: 0 0 28px rgba(255,34,68,0.9); }
}

#menu-bottom {
    position: absolute;
    bottom: 40px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#instructions {
    background: rgba(0, 0, 0, 0.85);
    padding: 20px 40px;
    border-radius: 15px;
    border: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    color: #eee;
    max-width: 600px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

#instructions h3 {
    margin-top: 0;
    color: #ffcc00;
    font-size: 1.2rem;
    letter-spacing: 2px;
}

#instructions p {
    margin: 5px 0;
    font-size: 0.9rem;
    color: #bbb;
}

#credits-btn {
    position: absolute;
    bottom: 0px;
    right: 40px;
    background: rgba(0, 0, 0, 0.7);
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: white;
    padding: 15px 45px;
    font-family: 'Orbitron', sans-serif;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 8px;
    font-weight: 700;
    letter-spacing: 2px;
    font-size: 1.2rem;
}

#back-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 10px 30px;
    font-family: 'Orbitron', sans-serif;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 5px;
    font-weight: 700;
    letter-spacing: 1px;
}

#credits-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: #fff;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

#back-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

/* Credits Screen */
#credits-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 200;
    pointer-events: auto;
}

#credits-content {
    max-width: 600px;
    text-align: center;
    padding: 40px;
    color: #ccc;
}

#credits-content h2 { color: #fff; margin-bottom: 30px; }
#credits-content strong { color: #ffcc00; }
#credits-content p { line-height: 1.6; margin: 15px 0; }

#linkedin-link {
    display: inline-block;
    color: #0077b5;
    text-decoration: none;
    font-weight: 700;
    margin: 10px 0;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

#linkedin-link:hover {
    border-bottom-color: #0077b5;
}

#credits-footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #333;
}

#credits-footer h3 { color: #fff; margin-bottom: 10px; }

#score-board { 
    margin-top: 4vh; 
    font-size: clamp(3rem, 6vw, 5rem); 
    font-weight: 700; 
    color: rgba(255, 255, 255, 0.9); 
    text-shadow: 0 4px 15px rgba(0,0,0,0.8); 
    display: flex; 
    gap: 20px; 
    z-index: 10;
}

#diff-label {
    position: absolute;
    top: 20px;
    right: 24px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 2px;
    padding: 5px 14px;
    border-radius: 6px;
    border: 1px solid #ffcc00;
    color: #ffcc00;
    background: rgba(0,0,0,0.6);
    z-index: 10;
    pointer-events: none;
}
#player-score { color: #cc2222; }
#ai-score { color: #ffcc00; } /* Default, overridden dynamically by difficulty color */
#score-divider { color: #ffffff; }

#rally-container { 
    margin-top: 10px; 
    font-size: clamp(1rem, 2vw, 1.5rem); 
    color: #ffcc00; 
    font-weight: 700;
    text-shadow: 0 2px 8px rgba(0,0,0,0.8); 
    transition: opacity 0.3s; 
    background: rgba(0, 0, 0, 0.4);
    padding: 5px 15px;
    border-radius: 10px;
    border: 1px solid rgba(255, 204, 0, 0.3);
}

#message-overlay { 
    position: absolute; 
    top: 50%; 
    left: 50%; 
    transform: translate(-50%, -50%); 
    text-align: center; 
    color: white; 
    background: rgba(10, 10, 10, 0.85); 
    padding: 40px 60px; 
    border-radius: 20px; 
    border: 2px solid #333; 
    pointer-events: auto; 
    cursor: pointer; 
    transition: opacity 0.3s, transform 0.2s;
    box-shadow: 0 10px 40px rgba(0,0,0,0.8);
}
#message-overlay:hover {
    transform: translate(-50%, -50%) scale(1.02);
    border-color: #555;
}
#main-message { 
    margin: 0 0 15px 0; 
    font-size: clamp(2rem, 5vw, 4rem); 
    letter-spacing: 4px; 
    text-transform: uppercase; 
    text-shadow: 0 0 15px rgba(255,255,255,0.2);
}
#sub-message { 
    margin: 0; 
    font-size: clamp(1rem, 2vw, 1.2rem); 
    color: #bbb; 
}
.hidden { 
    opacity: 0; 
    pointer-events: none !important; 
}