:root {
    --bg-color: #050510;
    --text-color: #ffffff;
    --panel-bg: rgba(255, 255, 255, 0.05);
    --panel-border: rgba(255, 255, 255, 0.1);
    --accent: #00f2ff;
    --font-main: 'Outfit', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-user-select: none;
    user-select: none;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

/* Canvas Layer - Full Screen */
#splatter-canvas {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    cursor: crosshair;
}

/* UI Layer - Floating above canvas */
#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none; /* Let clicks pass through to canvas */
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 2rem;
}

/* Header */
header {
    pointer-events: auto;
    text-shadow: 0 0 20px rgba(0, 242, 255, 0.3);
}

header h1 {
    font-weight: 700;
    font-size: 2.5rem;
    letter-spacing: -1px;
    background: linear-gradient(90deg, #fff, #aaa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    font-weight: 300;
    opacity: 0.6;
    letter-spacing: 2px;
    font-size: 0.9rem;
    text-transform: uppercase;
}

/* Controls Panel */
.controls {
    pointer-events: auto;
    background: var(--panel-bg);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid var(--panel-border);
    border-radius: 20px;
    padding: 1.5rem;
    width: 300px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.controls:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
}

.control-group label {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.8rem;
    opacity: 0.8;
}

/* Palette Buttons */
.palette-selector {
    display: flex;
    gap: 10px;
}

.palette-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.palette-btn:hover {
    transform: scale(1.1);
}

.palette-btn.active {
    border-color: #fff;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
}

/* Range Slider */
input[type="range"] {
    width: 100%;
    height: 6px;
    background: rgba(255,255,255,0.1);
    border-radius: 3px;
    appearance: none;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--text-color);
    cursor: pointer;
    transition: background 0.2s, transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 10px rgba(255,255,255,0.5);
}

/* Toggle Groups */
.toggle-group {
    display: flex;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    padding: 5px;
    border-radius: 12px;
    flex-wrap: wrap; /* Allow wrapping for many buttons */
}

.mode-btn {
    flex: 1;
    min-width: 80px; /* Ensure clickability */
    padding: 8px 12px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease;
    font-family: 'Outfit', sans-serif;
    font-weight: 500;
    font-size: 0.9rem;
    white-space: nowrap; /* Prevent text break */
}

.mode-btn.active {
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    font-weight: bold;
}

/* Physics Toggle */
.toggle-btn {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--panel-border);
    color: var(--text-color);
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.8rem;
    text-transform: uppercase;
    transition: all 0.2s;
}

.toggle-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.toggle-btn.active { /* For Anti-gravity ON state or similar status */
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 10px rgba(0, 242, 255, 0.2);
}

/* Action Buttons */
#clear-btn {
    background: transparent;
    border: 1px solid var(--panel-border);
    color: var(--text-color);
    padding: 0.8rem;
    border-radius: 10px;
    cursor: pointer;
    font-family: var(--font-main);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.8rem;
    transition: all 0.2s;
}

#clear-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.3);
}

#clear-btn:active {
    transform: scale(0.98);
}