:root {
    --primary: #7C3AED;
    --secondary: #A78BFA;
    --accent: #F472B6;
    --bg: #030712;
    --surface: rgba(17, 24, 39, 0.7);
    --text: #F9FAFB;
    --text-muted: #9CA3AF;
    --border: rgba(255, 255, 255, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

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

/* Fallback Message */
#fallback {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.hidden {
    display: none !important;
}

.message {
    text-align: center;
    padding: 2rem;
    max-width: 600px;
}

.message h1 {
    color: var(--accent);
    margin-bottom: 1rem;
}

/* Stats */
#stats {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--surface);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    font-family: monospace;
    font-size: 0.9rem;
    pointer-events: none;
    user-select: none;
}

#stats span {
    color: var(--secondary);
    font-weight: bold;
}

/* UI Container */
#ui-container {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 300px;
    background: var(--surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    transition: all 0.3s ease;
    max-height: calc(100vh - 2rem);
    overflow-y: auto;
}

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

.header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.5px;
}

#toggle-ui {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.2rem;
}

.controls {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

select, button, input[type="range"] {
    width: 100%;
}

select {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.5rem;
    border-radius: 6px;
    outline: none;
    cursor: pointer;
}

select:focus {
    border-color: var(--primary);
}

/* Sliders */
input[type="range"] {
    -webkit-appearance: none;
    background: transparent;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
    background: rgba(255, 255, 255, 0.1);
    height: 4px;
    border-radius: 2px;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    background: var(--secondary);
    width: 16px;
    height: 16px;
    border-radius: 50%;
    margin-top: -6px;
    transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    background: var(--primary);
}

/* Buttons */
button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.2s, transform 0.1s;
}

button:hover {
    background: var(--secondary);
}

button:active {
    transform: scale(0.98);
}

.preset-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.preset-buttons button {
    background: rgba(255, 255, 255, 0.05);
    font-size: 0.8rem;
    padding: 0.5rem;
}

.preset-buttons button:hover {
    background: rgba(255, 255, 255, 0.1);
}

.actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1rem;
    border-top: 1px solid var(--border);
    padding-top: 1rem;
}

#reset-btn {
    background: rgba(244, 114, 182, 0.2);
    color: var(--accent);
    border: 1px solid rgba(244, 114, 182, 0.3);
}

#reset-btn:hover {
    background: rgba(244, 114, 182, 0.4);
}

/* Scrollbar */
#ui-container::-webkit-scrollbar {
    width: 6px;
}

#ui-container::-webkit-scrollbar-track {
    background: transparent;
}

#ui-container::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

#ui-container::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}