:root {
    --bg-dark: #0A0A0A;
    --bg-panel: #111111;
    --accent: #FF6600;
    --accent-dim: rgba(255, 102, 0, 0.4);
    --border: #222222;
    --text-main: #FFFFFF;
    --text-dim: #888888;
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Noto Sans KR', sans-serif;
    --panel-width: 360px;
    --timeline-height: 60px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

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

#app-container {
    display: grid;
    grid-template-areas: 
        "main aside"
        "footer footer";
    grid-template-columns: 1fr var(--panel-width);
    grid-template-rows: 1fr var(--timeline-height);
    width: 100%;
    height: 100%;
}

/* Canvas Viewport */
#canvas-container {
    grid-area: main;
    position: relative;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

#p5-canvas {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

/* Checkerboard grid */
.canvas-grid-bg {
    background-image: linear-gradient(45deg, #111 25%, transparent 25%), 
                      linear-gradient(-45deg, #111 25%, transparent 25%), 
                      linear-gradient(45deg, transparent 75%, #111 75%), 
                      linear-gradient(-45deg, transparent 75%, #111 75%);
    background-size: 20px 20px;
}

/* Export Progress */
#export-progress-container {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    width: 340px;
    background: rgba(0,0,0,0.9);
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 4px;
    z-index: 1000;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    font-family: var(--font-display);
    font-size: 10px;
    margin-bottom: 12px;
}

.progress-info .label { color: var(--text-dim); letter-spacing: 2px; }
.progress-info .value { color: var(--accent); font-weight: 700; }

.progress-bar-wrap {
    width: 100%;
    height: 2px;
    background: #222;
}

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

#viewport-overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    pointer-events: none;
}

.status-bar {
    display: flex;
    gap: 24px;
    font-family: var(--font-display);
    font-size: 10px;
    letter-spacing: 0.1em;
}

.status-item .label { color: var(--text-dim); }
.status-item .value { color: var(--text-main); font-weight: 700; }

/* Control Panel */
#control-panel {
    grid-area: aside;
    background: var(--bg-panel);
    border-left: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.panel-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 2px;
}

.version {
    font-size: 9px;
    color: var(--text-dim);
    margin-left: 8px;
}

#fluxus-btn {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    padding: 6px 14px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 9px;
    border-radius: 2px;
    cursor: pointer;
    transition: all 0.2s;
}

#fluxus-btn:hover { background: var(--accent); color: #000; }

#tweakpane-container {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.panel-footer {
    padding: 24px;
    border-top: 1px solid var(--border);
}

.primary-btn {
    width: 100%;
    background: var(--accent);
    color: #000;
    border: none;
    padding: 16px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 11px;
    letter-spacing: 2px;
    cursor: pointer;
    margin-bottom: 20px;
}

.attribution {
    font-family: var(--font-display);
    font-size: 8px;
    color: var(--text-dim);
    text-align: center;
    letter-spacing: 0.3em;
}

/* Timeline */
#timeline-bar {
    grid-area: footer;
    background: var(--bg-panel);
    border-top: 1px solid var(--border);
    padding: 0 24px;
    display: flex;
    align-items: center;
}

.timeline-track {
    width: 100%;
    height: 2px;
    background: var(--border);
    position: relative;
}

.playhead {
    position: absolute;
    left: 0%;
    top: -8px;
    width: 1px;
    height: 18px;
    background: var(--accent);
}

/* Fullscreen Helper */
:fullscreen #canvas-container {
    width: 100vw;
    height: 100vh;
}