* {
    box-sizing: border-box;
}

/* Basic reset and full-screen canvas styling */
html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
    background-color: #000;
    font-family: monospace;
    color: #eee;
}

#matrix-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* --- Controls Panel --- */
.controls {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 15px;
    background-color: rgba(10, 20, 10, 0.7);
    border-radius: 8px;
    border: 1px solid limegreen;
    box-shadow: 0 0 15px rgba(0, 255, 0, 0.3);
    width: 320px;
    backdrop-filter: blur(3px);
    max-height: calc(100vh - 20px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: limegreen #1a1a1a;
    transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out;
}

.controls::-webkit-scrollbar {
    background-color: #1a1a1a;
}

.controls[data-visible="false"] {
    opacity: 0;
    transform: translateX(-110%);
    pointer-events: none;
}

.controls h3 {
    margin-top: 0;
    margin-bottom: 15px;
    color: limegreen;
    text-align: center;
    font-weight: normal;
    letter-spacing: 1px;
}

fieldset {
    border: 1px solid #333;
    border-radius: 4px;
    padding: 10px 15px;
    margin-bottom: 15px;
}

legend {
    color: #888;
    font-size: 0.8em;
    padding: 0 5px;
}

.control-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 10px;
}

.control-group:last-child {
    margin-bottom: 0;
}

.full-width {
    grid-column: 1 / -1;
}

.control-group label {
    margin-bottom: 8px;
    font-size: 0.9em;
    color: #ccc;
}

.control-group label small {
    opacity: 0.7;
}

.inline-inputs {
    display: flex;
    gap: 10px;
}

/* --- Input Styling --- */
input[type="number"],
input[type="text"],
select,
button {
    background-color: #1a1a1a;
    color: limegreen;
    border: 1px solid #444;
    padding: 8px;
    font-family: monospace;
    border-radius: 4px;
    box-sizing: border-box;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="color"] {
    background-color: #1a1a1a;
    border: 2px solid #444;
    border-radius: 4px;
    padding: 2px;
    height: 38px;
    width: 100%;
}

input:focus, select:focus {
    outline: none;
    border-color: limegreen;
    box-shadow: 0 0 5px rgba(0, 255, 0, 0.5);
}

input:hover, select:hover {
    background-color: #222;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: #333;
    outline: none;
    border-radius: 4px;
    margin: auto 0;
}

input[type="range"]:hover {
    background-color: #383838;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: limegreen;
    cursor: pointer;
    border-radius: 50%;
    border: 2px solid #111;
    transition: all 0.3s ease-in-out;
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: limegreen;
    cursor: pointer;
    border-radius: 50%;
    border: 2px solid #111;
    transition: all 0.3s ease-in-out;
}

input[type=range]::-webkit-slider-thumb:hover {
    cursor: pointer;
    border-radius: 25%;
}

input[type=range]::-moz-range-thumb:hover {
    cursor: pointer;
    border-radius: 25%;
}

.range-group {
    display: grid;
    grid-template-columns: 1fr 60px;
    gap: 10px;
    align-items: center;
}

.range-group label {
    grid-column: 1 / -1;
    margin-bottom: 0;
}

.range-group input[type="number"] {
    text-align: center;
    padding: 6px;
}

.hidden {
    display: none;
}

/* --- Buttons --- */
.button-group {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.button-group button {
    flex-grow: 1;
    cursor: pointer;
    border-color: limegreen;
}

.button-group button:hover {
    background-color: limegreen;
    color: #111;
}

#toggle-controls {
    position: absolute;
    top: 10px;
    left: 10px;
    width: 40px;
    height: 40px;
    border: 1px solid limegreen;
    border-radius: 0 50% 50% 50%;
    background-color: rgba(10, 20, 10, 0.85);
    z-index: 10;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, left 0.3s ease-in-out, border-radius 0.3s ease-in-out;
}

#toggle-controls img {
    width: 22px;
    height: 22px;
    filter: invert(65%) sepia(74%) saturate(1500%) hue-rotate(80deg);
    transition: filter 0.2s;
}

#toggle-controls:hover {
    background-color: limegreen;
}

#toggle-controls:hover img {
    filter: none;
}

#toggle-controls:has(+ .controls[data-visible="true"]) {
    left: 290px;
    border-radius: 50% 8px 50% 50%;
    transition: left 0.3s ease-in-out, border-radius 0.3s ease-in-out;
}