:root {
    --bg-color: #050505;
    --panel-bg: rgba(20, 20, 20, 0.7);
    --accent-color: #00f0ff;
    --text-main: #e0e0e0;
    --text-muted: #888;
    --glass-border: rgba(255, 255, 255, 0.1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Outfit', sans-serif;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: 
        radial-gradient(circle at 20% 30%, rgba(0, 240, 255, 0.03) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(255, 0, 255, 0.03) 0%, transparent 40%),
        #050505;
}

header {
    flex-shrink: 0;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
}

h1 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, #fff, #b8b8b8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.main-container {
    flex: 1;
    display: flex;
    overflow: hidden; /* Prevent body scroll */
    padding: 1rem;
    gap: 1rem;
    min-height: 0; /* Important for flex children to allow shrink */
}

.simulation-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-width: 0; /* Prevent overflow of flex items */
}

.canvas-wrapper {
    flex: 1;
    position: relative;
    background: var(--panel-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    overflow: hidden;
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 24px rgba(0,0,0,0.4);
    min-height: 100px; /* Ensure visibility */
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.canvas-label {
    position: absolute;
    top: 1rem;
    left: 1rem;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: 600;
    pointer-events: none;
    z-index: 10;
    background: rgba(0,0,0,0.4);
    padding: 0.3rem 0.6rem;
    border-radius: 12px;
}

.sidebar {
    width: 320px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex-shrink: 0;
    overflow-y: auto; /* Allow sidebar to scroll if too high */
    scrollbar-width: none; /* Hide scrollbar Firefox */
}
.sidebar::-webkit-scrollbar { display: none; } /* Hide scrollbar Chrome/Safari */

.controls-card {
    background: var(--panel-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}

.info-card {
    flex: 1;
    background: rgba(255,255,255,0.02);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-main);
}

.info-card h3 {
    color: #fff;
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.control-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.control-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.control-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-color);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255,255,255,0.08);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: #fff;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(255,255,255,0.4);
    transition: all 0.2s ease;
    border: 2px solid var(--bg-color);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    background: var(--accent-color);
}

.spectrum-bar {
    height: 6px;
    width: 100%;
    border-radius: 3px;
    background: linear-gradient(to right, 
        rgb(127, 0, 255) 0%, 
        rgb(0, 0, 255) 16.2%, 
        rgb(0, 255, 255) 29.7%, 
        rgb(0, 255, 0) 35.1%, 
        rgb(255, 255, 0) 54.1%, 
        rgb(255, 0, 0) 71.6%, 
        rgb(255, 0, 0) 100%
    );
    margin-bottom: -4px;
}

@media (max-width: 900px) {
    .main-container {
        flex-direction: column;
        overflow-y: auto;
    }
    .sidebar {
        width: 100%;
    }
    .canvas-wrapper {
        min-height: 180px;
    }
}