html, body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    height: 100%;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #111;
    color: #fff;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #111;
    position: relative;
}

#playSpace {
    width: 600px;
    height: 600px;
    position: relative;
    border: 3px solid #fff;
    background-color: #222;
    box-shadow: 0 0 20px #80ff00 inset, 0 0 15px #c0ff00;
}

.tile {
    box-sizing: border-box;
    border: 1px solid rgba(255,255,255,0.1);
    width: 80px;
    height: 80px;
    position: absolute;
    background-size: cover;
}

#hero, #derplenaut {
    position: absolute;
    width: 80px;
    height: 80px;
    z-index: 10;
}
.popup {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -55%);
    z-index: 100;
    text-align: center;
    padding: 25px 40px;
    border-radius: 12px;
    background-color: #1c1c1c;
    color: #e6ff7f;
    box-shadow: 0 0 15px rgba(230, 255, 127, 0.5), 0 0 40px rgba(230, 255, 127, 0.2) inset;
    border: 2px solid #aaff4c;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease-in-out, transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
    font-family: 'Segoe UI', sans-serif;
}

.popup.visible {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%);
}

.popup h2 {
    font-size: 2em;
    font-weight: 700;
    margin-bottom: 12px;
    color: #dfff7f;
}

.popup p {
    color: #d4ff9f;
    font-size: 1.15rem;
    line-height: 1.5;
}

.popup button {
    padding: 10px 22px;
    margin-top: 20px;
    border-radius: 10px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    border: 2px solid #c0ff00;
    background: linear-gradient(145deg, #dfff7f, #aaff4c);
    color: #1c1c1c;
    text-transform: uppercase;
    transition: all 0.25s ease;
    box-shadow: 0 0 8px rgba(208, 255, 127, 0.5);
}

.popup button:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(208, 255, 127, 0.8);
}

.game-over-popup {
    border-top: 4px solid #ffb347;
    background-color: #1c1c1c;
    box-shadow: 0 0 15px rgba(255, 179, 71, 0.5);
}

.game-over-popup h2 {
    color: #ffcc66;
}

.game-over-popup p {
    color: #ffe5b4;
}

.game-over-popup button {
    background: linear-gradient(145deg, #ffb347, #ffcc66);
    border-color: #ffb347;
    color: #1c1c1c;
}

.game-over-popup button:hover {
    background: linear-gradient(145deg, #ff9933, #ffaa55);
}

.win-popup {
    border-top: 4px solid #8aff7f;
    background-color: #1c1c1c;
    box-shadow: 0 0 15px rgba(138, 255, 127, 0.5);
}

.win-popup h2 {
    color: #baff99;
}

.win-popup p {
    color: #d4ffb4;
}

.win-popup button {
    background: linear-gradient(145deg, #8aff7f, #baff99);
    border-color: #8aff7f;
    color: #1c1c1c;
}

.win-popup button:hover {
    background: linear-gradient(145deg, #66ff55, #99ff88);
}

.win-popup button:hover {
    background-color: #27ae60;
}

.start-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Darker, richer gradient */
    background: radial-gradient(circle at center, #1a1a1a 0%, #050505 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #c0ff00;
    font-family: 'Handjet', sans-serif;
    z-index: 1000;
    text-align: center;
    overflow: hidden;
}

/* 1. The "CRT/Scanline" Overlay - Adds instant texture */
.start-screen::before {
    content: " ";
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), 
                linear-gradient(90deg, rgba(255, 0, 0, 0.03), rgba(0, 255, 0, 0.01), rgba(0, 0, 255, 0.03));
    background-size: 100% 3px, 3px 100%;
    pointer-events: none;
    z-index: 1001;
}

.start-screen h1 {
    font-size: 8rem; /* Bigger impact */
    margin-bottom: 3rem;
    color: #c0ff00;
    letter-spacing: -2px;
    text-transform: uppercase;
    /* Multilayered glow for depth */
    text-shadow:
        0 0 10px rgba(192, 255, 0, 0.8),
        0 0 20px rgba(192, 255, 0, 0.4),
        0 0 40px rgba(192, 255, 0, 0.2);
    animation: glowPulse 2s infinite alternate;
}

.start-screen .buttons {
    display: flex;
    gap: 2.5rem;
    z-index: 1002; /* Ensure buttons are clickable above overlay */
}

.start-screen .buttons button {
    padding: 1rem 3.5rem;
    font-size: 1.8rem;
    font-family: 'Handjet', sans-serif;
    font-weight: 900;
    border: 2px solid #c0ff00;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    text-transform: uppercase;
    clip-path: polygon(10% 0, 100% 0, 100% 70%, 90% 100%, 0 100%, 0 30%); /* Angled "Gaming" corners */
}

/* Primary Button (Start) */
#startButton {
    background: #c0ff00;
    color: #000;
    box-shadow: 0 0 20px rgba(192, 255, 0, 0.4);
}

#startButton:hover {
    transform: translateY(-5px) scale(1.05);
    background: #fff;
    border-color: #fff;
    box-shadow: 0 0 40px rgba(255, 255, 255, 0.6);
}

/* Secondary Button (Instructions) */
#instructionsButton {
    background: rgba(192, 255, 0, 0.1);
    color: #c0ff00;
}

#instructionsButton:hover {
    transform: translateY(-5px) scale(1.05);
    background: rgba(192, 255, 0, 0.3);
    box-shadow: 0 0 20px rgba(192, 255, 0, 0.4);
}

@keyframes glowPulse {
    from { filter: brightness(1) contrast(1); }
    to { filter: brightness(1.2) contrast(1.2); }
}

#instructionsText {
    margin-top: 2rem;
    color: #dfff00;
    text-align: left;
    max-width: 600px;
    font-size: 1.3rem;
    line-height: 1.6;
    background: rgba(0, 0, 0, 0.6);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 0 15px #c0ff00 inset;
}


body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

    .instructions-card {
        margin: 2.5rem auto 0 auto;
        max-width: 520px;
        background: linear-gradient(135deg, #232323 60%, #2a2a2a 100%);
        border-radius: 22px;
        box-shadow: 0 0 32px #c0ff00, 0 0 18px #aaff00 inset, 0 4px 32px #000;
        border: 3px solid #c0ff00;
        padding: 2.8rem 2.2rem 2rem 2.2rem;
        color: #f6ffdf;
        font-size: 1.22rem;
        line-height: 1.8;
        opacity: 0;
        transform: translateY(-20px);
        transition: opacity 0.35s cubic-bezier(.4,0,.2,1), transform 0.35s cubic-bezier(.4,0,.2,1);
        display: none;
        z-index: 1100;
        font-family: 'Montserrat', 'Poppins', 'Segoe UI', sans-serif;
        position: relative;
        overflow: hidden;
    }
    .instructions-card::before {
        content: "";
        position: absolute;
        top: 0; left: 0; right: 0; height: 8px;
        background: linear-gradient(90deg, #c0ff00 0%, #aaff00 50%, #80ff00 100%);
        border-radius: 22px 22px 0 0;
        opacity: 0.7;
    }
    .instructions-card::after {
        content: "";
        position: absolute;
        bottom: 0; left: 0; right: 0; height: 8px;
        background: linear-gradient(90deg, #c0ff00 0%, #aaff00 50%, #80ff00 100%);
        border-radius: 0 0 22px 22px;
        opacity: 0.7;
    }
    
    .instructions-card.visible {
        opacity: 1;
        transform: translateY(0);
        display: block;
    }
    .instructions-header {
        display: flex;
        align-items: center;
        justify-content: center;
        margin-bottom: 1.8rem;
    }
    
    .instructions-icon {
        font-size: 2.2rem;
        color: #c0ff00;
        filter: drop-shadow(0 0 8px #c0ff00);
    }
    .instructions-header h2 {
        font-size: 2.4rem;
        font-weight: 700;
        margin: 0;
        letter-spacing: 1px;
        background: linear-gradient(90deg, #c0ff00 0%, #aaff00 50%, #80ff00 100%);
        color: transparent;
        -webkit-background-clip: text;
        background-clip: text;
        animation: instructions-glow 2s infinite alternate;
        font-family: 'Montserrat', 'Poppins', sans-serif;
    }
    @keyframes instructions-glow {
        0% { filter: drop-shadow(0 0 6px #c0ff00); }
        100% { filter: drop-shadow(0 0 16px #aaff00); }
    }
    
    .instructions-body ul {
        margin: 1rem 0 1.2rem 0;
        padding-left: 1.2rem;
        list-style: disc;
    }
    .instructions-list {
        margin-bottom: 1.2rem;
        padding: 0.5rem 0 0.5rem 0;
        background: rgba(255,255,255,0.04);
        border-radius: 10px;
        box-shadow: 0 0 8px #c0ff00 inset;
    }
    
    .instructions-label {
        color: #c0ff00;
        font-weight: 700;
        margin-right: 0.3em;
        font-family: 'Poppins', 'Montserrat', sans-serif;
        letter-spacing: 0.03em;
        font-size: 1.08em;
    }
    .instructions-welcome {
        color: #f6ffdf;
        font-size: 1.22rem;
        margin-bottom: 1.1rem;
        font-family: 'Poppins', 'Montserrat', sans-serif;
        text-align: center;
        letter-spacing: 0.02em;
    }
    .instructions-goodluck {
        color: #c0ff00;
        font-size: 1.18rem;
        margin-top: 1.2rem;
        font-weight: 600;
        text-align: center;
        font-family: 'Montserrat', 'Poppins', sans-serif;
        letter-spacing: 0.03em;
    }
    
    .instructions-body li {
        margin-bottom: 0.7rem;
        font-size: 1.18rem;
        color: #f6ffdf;
        letter-spacing: 0.02em;
        font-family: 'Poppins', 'Montserrat', sans-serif;
    }
    .instructions-body .key {
        display: inline-block;
        background: linear-gradient(90deg, #232323 60%, #2a2a2a 100%);
        color: #c0ff00;
        border-radius: 6px;
        padding: 0.15em 0.5em;
        font-family: 'Montserrat', 'Poppins', 'Segoe UI', monospace;
        font-size: 1.08em;
        box-shadow: 0 0 4px #c0ff00 inset;
        margin-left: 0.2em;
        border: 1.5px solid #c0ff00;
        letter-spacing: 0.04em;
    }
    .instructions-body p {
        color: #f6ffdf;
        margin-bottom: 0.7rem;
        font-size: 1.15rem;
        font-family: 'Poppins', 'Montserrat', sans-serif;
    }

.particle {
    position: absolute;
    width: 6px;
    height: 6px;
    background: radial-gradient(circle, #c0ff00 0%, #80ff00 70%, transparent 100%);
    border-radius: 50%;
    animation: floatParticle linear infinite;
    opacity: 0.6;
    pointer-events: none;
}

@keyframes floatParticle {
    0% {
        transform: translate(var(--startX), var(--startY)) scale(0.5);
        opacity: 0;
    }
    10% {
        opacity: 0.6;
    }
    100% {
        transform: translate(var(--endX), var(--endY)) scale(1.2);
        opacity: 0;
    }
}

#messageArea {
    width: 600px;
    margin-bottom: 10px;
    padding: 12px 20px;
    border-radius: 10px;
    background: #1c1c1c;
    color: #e6ff7f;
    font-size: 1.2rem;
    text-align: center;
    font-weight: 600;
    box-shadow: 0 0 10px #aaff4c, 0 0 20px #dfff7f inset;
    border: 2px solid #aaff4c;
    font-family: 'Segoe UI', sans-serif;
}