:root {
    --bg-color: #050508;
    --panel-bg: rgba(15, 20, 30, 0.65);
    --border-color: rgba(0, 229, 255, 0.15);
    --accent: #00e5ff;
    --accent-glow: rgba(0, 229, 255, 0.6);
    --text-primary: #ffffff;
    --text-secondary: #8a9bb4;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, sans-serif;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

.viewer-section {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at center, #111520 0%, #030406 100%);
    transition: background 0.3s ease;
}

.canvas-wrapper {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    box-shadow: 0 25px 80px rgba(0,0,0,0.8), 0 0 0 1px rgba(255,255,255,0.05);
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.canvas-wrapper:hover {
    transform: scale(1.01);
}

canvas {
    display: block;
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
}

#base-canvas {
    position: relative;
    z-index: 1;
}

#glow-canvas {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    mix-blend-mode: screen;
    pointer-events: none;
}

.pulse-anim {
    animation: neon-pulse var(--pulse-dur, 1.5s) infinite alternate ease-in-out;
}

@keyframes neon-pulse {
    0% { 
        opacity: 0.1; 
        filter: blur(var(--glow-rad, 15px)) brightness(0.9); 
    }
    100% { 
        opacity: 1; 
        filter: blur(var(--glow-rad, 15px)) brightness(1.6) drop-shadow(0 0 12px var(--accent-glow)); 
    }
}

.placeholder-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 3;
    pointer-events: none;
    color: var(--text-secondary);
    background: rgba(0,0,0,0.4);
    padding: 40px 60px;
    border-radius: 16px;
    backdrop-filter: blur(10px);
    border: 1px dashed rgba(255,255,255,0.2);
}

.placeholder-text h2 {
    color: var(--text-primary);
    font-weight: 400;
    font-size: 20px;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.controls-section {
    width: 360px;
    padding: 30px 24px;
    border-left: 1px solid var(--border-color);
    background: var(--panel-bg);
    backdrop-filter: blur(30px);
    z-index: 10;
    box-shadow: -10px 0 30px rgba(0,0,0,0.5);
    overflow-y: auto;
}

.glass-panel {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.glass-panel h1 {
    font-size: 28px;
    font-weight: 600;
    margin: 0;
    background: linear-gradient(90deg, #ffffff, var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

.subtitle {
    margin: 0;
    margin-top: -20px;
    font-size: 11px;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 600;
}

.instructions {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    background: rgba(0, 229, 255, 0.05);
    padding: 12px;
    border-radius: 8px;
    border-left: 3px solid var(--accent);
}

.divider {
    border: none;
    height: 1px;
    background: linear-gradient(90deg, rgba(255,255,255,0.05), rgba(255,255,255,0.1), rgba(255,255,255,0.05));
    margin: 8px 0;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.control-group label {
    font-size: 13px;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 300;
}

.val-badge {
    background: rgba(255,255,255,0.08);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    color: var(--accent);
    font-family: monospace;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    background: rgba(255,255,255,0.1);
    border-radius: 2px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    box-shadow: 0 0 12px var(--accent-glow);
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.3);
}

.primary-btn {
    background: rgba(0, 229, 255, 0.05);
    color: var(--accent);
    border: 1px solid rgba(0, 229, 255, 0.3);
    padding: 14px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.3s ease;
    margin-top: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.primary-btn:hover {
    background: var(--accent);
    color: #000;
    border-color: var(--accent);
    box-shadow: 0 0 20px var(--accent-glow);
    transform: translateY(-2px);
}

.primary-btn:active {
    transform: translateY(0);
}