:root {
    --bg-color: #050505;
    --text-color: #e0faff;
    --accent-color: #00ffcc;
    /* Cyan Neon */
    --neon-purple: #bc13fe;
    --neon-pink: #ff0055;
    --neon-blue: #00ccff;
    --glass-bg: rgba(5, 10, 15, 0.85);
    --border-glow: 0 0 10px rgba(0, 255, 204, 0.5);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Exo 2', sans-serif;
    overflow: hidden;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

body::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(0deg,
            transparent,
            transparent 2px,
            rgba(0, 255, 204, 0.03) 3px);
    pointer-events: none;
    z-index: 5;
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* Overlay Styles */
#overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    z-index: 10;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    transition: opacity 0.5s ease, visibility 0.5s;
}

#overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.content h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
    color: #fff;
    text-shadow:
        3px 3px var(--neon-pink),
        -3px -3px var(--neon-blue);
    letter-spacing: 8px;
    animation: titleGlitch 5s infinite;
}

@keyframes titleGlitch {
    0% {
        transform: skew(0deg);
    }

    98% {
        transform: skew(0deg);
    }

    99% {
        transform: skew(10deg);
        color: var(--neon-pink);
    }

    100% {
        transform: skew(-10deg);
        color: var(--neon-blue);
    }
}

.content p {
    font-size: 1rem;
    margin-bottom: 2rem;
    color: var(--text-color);
}

/* Brand Logo */
#app-logo {
    position: absolute;
    top: 30px;
    left: 30px;
    z-index: 110;
    font-family: 'Orbitron', sans-serif;
    color: #fff;
    font-weight: 900;
    font-size: 28px;
    letter-spacing: 6px;
    text-shadow:
        0 0 10px rgba(0, 255, 204, 0.8),
        0 0 20px rgba(0, 255, 204, 0.4);
    pointer-events: none;
    user-select: none;
}

#app-logo::after {
    content: "SYSTEM";
    font-size: 10px;
    display: block;
    margin-top: -5px;
    color: var(--neon-pink);
    letter-spacing: 2px;
}

#app-logo span {
    color: var(--accent-color);
    font-size: 12px;
    font-weight: 400;
    margin-left: 10px;
    border: 1px solid var(--accent-color);
    padding: 2px 6px;
    vertical-align: middle;
}

/* UI Panel Container - TOP LEFT */
#ui-controls.panel {
    position: absolute;
    top: 100px;
    left: 30px;
    z-index: 100;

    display: none;
    flex-direction: column;
    gap: 20px;

    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(0, 255, 204, 0.3);
    border-left: 4px solid var(--accent-color);
    padding: 25px;
    box-shadow: 10px 10px 30px rgba(0, 0, 0, 0.5);
    min-width: 250px;
}

/* Guide Modal */
#guideModal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
}

#guideModal.visible {
    display: flex;
}

.guide-content {
    background: rgba(10, 15, 15, 0.95);
    border: 1px solid var(--accent-color);
    padding: 40px;
    max-width: 600px;
    position: relative;
    box-shadow: 0 0 40px rgba(0, 255, 204, 0.15);
}

.guide-content h2 {
    color: var(--accent-color);
    border-bottom: 1px solid rgba(0, 255, 204, 0.3);
    padding-bottom: 10px;
    margin-bottom: 20px;
    font-family: 'Courier New', monospace;
    letter-spacing: 2px;
}

.guide-section {
    margin-bottom: 20px;
    text-align: left;
}

.guide-section h3 {
    color: #fff;
    font-size: 14px;
    margin-bottom: 8px;
    opacity: 0.9;
}

.guide-section p {
    color: #ccc;
    font-size: 13px;
    line-height: 1.5;
    margin-bottom: 5px;
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    color: var(--accent-color);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s;
}

.close-modal:hover {
    color: #fff;
}

/* Secondary Button (Guide) */
.secondary-btn {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 8px 15px;
    font-size: 11px;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
}

.secondary-btn:hover {
    background: rgba(0, 255, 204, 0.1);
}

/* Header Text */
.panel-header {
    font-family: 'Orbitron', sans-serif;
    color: var(--accent-color);
    font-size: 12px;
    font-weight: 900;
    letter-spacing: 3px;
    border-bottom: 2px solid rgba(0, 255, 204, 0.2);
    padding-bottom: 12px;
    margin-bottom: 10px;
    text-transform: uppercase;
}

/* Sliders */
.control-group {
    display: flex;
    flex-direction: column;
    /* Stack label and slider */
    gap: 5px;
}

.control-group label {
    font-family: 'Helvetica Neue', sans-serif;
    color: #888;
    font-size: 10px;
    letter-spacing: 1px;
}

/* Mode Selector Dropdown */
#modeSelector {
    width: 100%;
    padding: 10px;
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(0, 255, 204, 0.4);
    color: #fff;
    font-family: 'Exo 2', sans-serif;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    outline: none;
    transition: border-color 0.3s;
}

#modeSelector:focus {
    border-color: var(--accent-color);
}

#modeSelector option {
    background: #111;
    color: var(--accent-color);
}

input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    /* Standard property */
    width: 100%;
    background: transparent;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 12px;
    width: 12px;
    background: var(--accent-color);
    cursor: pointer;
    margin-top: -5px;
    border-radius: 50%;
    /* Rounded thumb */
    box-shadow: 0 0 5px var(--accent-color);
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 2px;
    cursor: pointer;
    background: #444;
}

/* Footer / Button */
.panel-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 15px;
    margin-top: 5px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

#downloadButton {
    background: rgba(0, 255, 204, 0.1);
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 8px 15px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 12px;
    font-weight: bold;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s ease;
}

#downloadButton:hover {
    background: var(--accent-color);
    color: #000;
    box-shadow: 0 0 15px var(--accent-color);
}

#startButton {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    padding: 18px 45px;
    font-family: 'Orbitron', sans-serif;
    font-size: 1.4rem;
    font-weight: 900;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    text-transform: uppercase;
    letter-spacing: 5px;
    position: relative;
    overflow: hidden;
}

#startButton::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 255, 204, 0.2), transparent);
    transition: 0.5s;
}

#startButton:hover::before {
    left: 100%;
}

#startButton:hover {
    background: var(--accent-color);
    color: #000;
    box-shadow: 0 0 30px var(--accent-color);
    transform: scale(1.05);
}

.privacy-notice {
    margin-top: 3rem;
    font-size: 0.7rem !important;
    opacity: 0.6;
    line-height: 1.4;
    border-top: 1px dashed #333;
    padding-top: 1rem;
}