:root {
    --bg-color: #050505;
    --text-color: #ffffff;
    --panel-bg: rgba(20, 20, 20, 0.65);
    --panel-border: rgba(255, 255, 255, 0.1);
    --accent: #00ffaa;
    --accent-hover: #00cc88;
    --font-main: 'Outfit', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    overflow: hidden;
}

#canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1;
}

#ui-container {
    position: relative;
    z-index: 10;
}

/* Hamburger Button */
#hamburger-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    color: var(--text-color);
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

#hamburger-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: scale(1.05);
}

/* Settings Panel */
#settings-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 320px;
    height: 100vh;
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-left: 1px solid var(--panel-border);
    padding: 24px;
    transform: translateX(0);
    transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
    overflow-y: auto;
}

#settings-panel.hidden {
    transform: translateX(100%);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.panel-header h2 {
    font-weight: 500;
    font-size: 1.5rem;
    letter-spacing: -0.02em;
}

#close-btn {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    opacity: 0.7;
    transition: opacity 0.2s;
}

#close-btn:hover {
    opacity: 1;
}

/* Controls */
.control-group {
    margin-bottom: 24px;
}

.control-group label {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 8px;
    opacity: 0.9;
}

input[type="range"] {
    width: 100%;
    margin-bottom: 8px;
    cursor: pointer;
    accent-color: var(--accent);
}

select {
    width: 100%;
    padding: 8px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    color: var(--text-color);
    cursor: pointer;
    font-family: var(--font-main);
    outline: none;
}

option {
    background: #222;
}

.color-row {
    display: flex;
    gap: 10px;
}

input[type="color"] {
    width: 100%;
    height: 40px;
    border: none;
    background: transparent;
    cursor: pointer;
}

.value-display {
    font-size: 0.8rem;
    color: var(--accent);
    font-family: monospace;
}

.divider {
    height: 1px;
    background: var(--panel-border);
    margin: 24px 0;
}

/* Metrics */
.info-section {
    margin-bottom: 24px;
}

.info-section h3 {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 12px;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.metric-row {
    font-size: 0.8rem;
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    opacity: 0.8;
}

.mono-val {
    font-family: monospace;
    color: var(--accent);
}

.metric {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.fade-text {
    font-size: 0.75rem;
    color: var(--accent);
    margin-top: 6px;
    opacity: 0;
    transition: opacity 1s ease;
    font-style: italic;
    pointer-events: none;
}

.fade-text.visible {
    opacity: 0.8;
}

.metric span {
    width: 60px;
}

.bar-container {
    flex-grow: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    transition: width 0.1s linear;
}

#status-text {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Buttons */
#start-audio-btn {
    width: 100%;
    padding: 12px;
    background: var(--accent);
    border: none;
    border-radius: 8px;
    color: #000;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.2s;
    font-family: var(--font-main);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

#start-audio-btn:hover {
    background: var(--accent-hover);
}

#start-audio-btn:disabled {
    background: #333;
    color: #555;
    cursor: not-allowed;
}

#settings-panel::-webkit-scrollbar {
    width: 8px;
}

#settings-panel::-webkit-scrollbar-track {
    background: transparent;
}

#settings-panel::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}