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

:root {
    --bg-color: #080808;
    --panel-bg: rgba(15, 15, 15, 0.9);
    --text-color: #e0e0e0;
    --text-muted: #888;
    --border-color: #333;
    --accent: #ffffff;
    --grid-color: rgba(255, 255, 255, 0.05);
    --slider-track: #333;
    --slider-thumb: #ccc;
}

body {
    font-family: 'Space Mono', monospace;
    background: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
    font-size: 12px;
}

/* Background Grid */
.app-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 50px 50px;
    background-position: center center;
}

/* Stage Area */
.stage {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none; /* Allow clicks to pass through empty areas */
}

.preview-container {
    position: relative;
    width: 400px;
    height: 300px;
    pointer-events: auto;
    box-shadow: 0 0 50px rgba(0,0,0,0.5);
}

#preview-element {
    width: 100%;
    height: 100%;
    background: #ff4a00;
    overflow: hidden;
}

#preview-element img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

#grid-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

/* Config Panel */
.config-panel {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 340px;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    border-radius: 4px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 40px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.panel-header {
    padding: 10px 15px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255,255,255,0.02);
}

.panel-header h2 {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    color: var(--text-muted);
}

.header-decoration {
    font-size: 12px;
    color: var(--text-muted);
}

.panel-content {
    padding: 15px;
    overflow-y: auto;
}

/* Scrollbar */
.panel-content::-webkit-scrollbar {
    width: 4px;
}
.panel-content::-webkit-scrollbar-track {
    background: transparent;
}
.panel-content::-webkit-scrollbar-thumb {
    background: #444;
    border-radius: 2px;
}

/* Mode Toggle */
.mode-toggle {
    display: flex;
    gap: 1px;
    background: var(--border-color);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 20px;
}

.mode-btn {
    flex: 1;
    padding: 8px;
    background: #111;
    color: var(--text-muted);
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 11px;
    text-transform: uppercase;
    transition: all 0.2s;
}

.mode-btn:hover {
    color: var(--text-color);
}

.mode-btn.active {
    background: #333;
    color: var(--text-color);
}

/* Instructions */
.instructions {
    margin-bottom: 20px;
    padding: 10px;
    background: rgba(255,255,255,0.03);
    border-left: 2px solid var(--text-muted);
    color: var(--text-muted);
    font-size: 11px;
}

/* Sections */
h3 {
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 15px;
    letter-spacing: 1px;
    border-bottom: 1px solid #222;
    padding-bottom: 5px;
}

.control-section {
    margin-bottom: 20px;
}

.corner-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px 15px;
}

.corner-control {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 15px;
}

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

.corner-control label {
    font-size: 11px;
    color: var(--text-muted);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.checkbox-label span {
    font-size: 10px;
    text-transform: uppercase;
}

/* Custom Inputs */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 2px;
    background: var(--slider-track);
    outline: none;
    margin: 5px 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 10px;
    height: 10px;
    background: var(--slider-thumb);
    cursor: pointer;
    border-radius: 0; /* Square handles for tech look */
    border: 1px solid #000;
}

input[type="checkbox"], input[type="radio"] {
    appearance: none;
    width: 12px;
    height: 12px;
    border: 1px solid var(--text-muted);
    background: transparent;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

input[type="checkbox"]:checked, input[type="radio"]:checked {
    background: var(--text-color);
    border-color: var(--text-color);
}

/* Sub-controls */
.width-control, .angle-control {
    margin-top: 5px;
    padding-left: 8px;
    border-left: 1px solid #333;
}

.value-display {
    font-size: 10px;
    color: var(--text-color);
    align-self: flex-end;
    font-family: monospace;
}

.edge-type-control {
    display: flex;
    gap: 10px;
    margin: 8px 0;
}

.trapezoid-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

/* Polygon Actions */
.polygon-actions {
    display: flex;
    gap: 5px;
    margin-bottom: 10px;
}

.polygon-actions button {
    flex: 1;
    background: transparent;
    border: 1px solid var(--text-muted);
    color: var(--text-color);
    padding: 6px;
    font-family: inherit;
    font-size: 10px;
    text-transform: uppercase;
    cursor: pointer;
}

.polygon-actions button:hover {
    background: rgba(255,255,255,0.1);
}

.point-list {
    max-height: 100px;
    overflow-y: auto;
    font-size: 10px;
    background: #111;
    padding: 5px;
    border: 1px solid #333;
    margin-bottom: 15px;
    color: var(--text-muted);
}

.point-item {
    padding: 2px 0;
    border-bottom: 1px solid #222;
}

/* CSS Output */
.css-output {
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
    margin-top: 20px;
}

.code-block {
    background: #000;
    border: 1px solid #333;
    padding: 10px;
    margin-bottom: 10px;
    font-size: 10px;
    color: #88ff88;
    overflow-x: auto;
}

#copy-btn {
    width: 100%;
    padding: 8px;
    background: var(--text-color);
    color: #000;
    border: none;
    font-family: inherit;
    font-weight: 700;
    font-size: 11px;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.2s;
}

#copy-btn:hover {
    background: #fff;
}

#copy-btn.copied {
    background: #88ff88;
}