:root {
    --bp-bg: #0b1a30;
    --bp-grid: rgba(0, 242, 255, 0.07);
    --bp-grid-major: rgba(0, 242, 255, 0.15);
    --bp-line: #00f2ff;
    --bp-line-dim: rgba(0, 242, 255, 0.4);
    --bp-text: #e0f2fe;
    --bp-accent: #bf00ff;
    --bp-accent-dim: rgba(191, 0, 255, 0.4);
    --bp-warn: #ffaa00;
    --bp-panel-bg: rgba(11, 26, 48, 0.85);
    --bp-border: 1px solid rgba(0, 242, 255, 0.3);
    --bp-border-bright: 1px solid #00f2ff;
}

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

body {
    background-color: var(--bp-bg);
    background-image: 
        linear-gradient(var(--bp-grid-major) 1px, transparent 1px),
        linear-gradient(90deg, var(--bp-grid-major) 1px, transparent 1px),
        linear-gradient(var(--bp-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--bp-grid) 1px, transparent 1px);
    background-size: 100px 100px, 100px 100px, 20px 20px, 20px 20px;
    color: var(--bp-text);
    font-family: 'Space Mono', monospace;
    overflow: hidden;
    height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr auto;
}

/* Scanline Overlay */
.scanline {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 242, 255, 0.015) 2px,
        rgba(0, 242, 255, 0.015) 4px
    );
    pointer-events: none;
    z-index: 9999;
}

/* Technical Border Overlay */
.blueprint-border {
    position: absolute;
    top: 10px;
    left: 10px;
    right: 10px;
    bottom: 10px;
    border: 2px solid var(--bp-line);
    pointer-events: none;
    z-index: 1000;
    opacity: 0.8;
}
.blueprint-border::before {
    content: "";
    position: absolute;
    top: 4px;
    left: 4px;
    right: 4px;
    bottom: 4px;
    border: 0.5px solid var(--bp-line-dim);
}

/* Header / Drawing Title Block */
header {
    padding: 16px 24px;
    background: rgba(11, 26, 48, 0.9);
    border-bottom: 2px solid var(--bp-line);
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.title-block {
    display: flex;
    align-items: center;
    gap: 20px;
}

.drawing-number {
    border: 1px solid var(--bp-accent);
    padding: 4px 8px;
    font-size: 0.85rem;
    color: var(--bp-accent);
    text-shadow: 0 0 8px var(--bp-accent-dim);
}

h1 {
    font-family: 'Share Tech Mono', monospace;
    font-size: 1.4rem;
    letter-spacing: 2px;
    color: #fff;
    text-shadow: 0 0 10px rgba(191, 0, 255, 0.5);
}

/* Workspace Grid */
main {
    display: grid;
    grid-template-columns: 340px 1fr 300px;
    height: 100%;
    overflow: hidden;
    position: relative;
}

/* Panels styling */
.panel {
    background: var(--bp-panel-bg);
    border-right: 1px solid rgba(0, 242, 255, 0.2);
    display: flex;
    flex-direction: column;
    z-index: 5;
    overflow-y: auto;
    position: relative;
    backdrop-filter: blur(5px);
}

.panel-right {
    border-right: none;
    border-left: 1px solid rgba(0, 242, 255, 0.2);
}

.panel-header {
    padding: 12px 20px;
    border-bottom: 1px solid rgba(0, 242, 255, 0.3);
    background: rgba(191, 0, 255, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-title {
    font-family: 'Share Tech Mono', monospace;
    text-transform: uppercase;
    font-size: 0.95rem;
    letter-spacing: 1px;
    color: var(--bp-accent);
    font-weight: bold;
    text-shadow: 0 0 6px var(--bp-accent-dim);
}

.panel-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Viewport */
#viewport-container {
    position: relative;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, #0f2c4c 0%, #061224 100%);
}

#canvas3d {
    width: 100%;
    height: 100%;
    display: block;
}

/* Interactive overlay for dimensioning */
#dimensions-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 2;
}

/* Widgets & Sliders */
.control-group {
    border: 1px dashed rgba(191, 0, 255, 0.2);
    padding: 14px;
    border-radius: 4px;
    background: rgba(191, 0, 255, 0.01);
}

.control-group-title {
    font-size: 0.8rem;
    color: var(--bp-warn);
    margin-bottom: 12px;
    text-transform: uppercase;
    font-weight: bold;
    display: flex;
    justify-content: space-between;
}

.param-row {
    margin-bottom: 12px;
}
.param-row:last-child {
    margin-bottom: 0;
}

.param-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    margin-bottom: 6px;
}

.param-label {
    color: rgba(255,255,255,0.7);
}
.param-value {
    color: var(--bp-line);
    font-weight: bold;
}

input[type="range"] {
    flex: 1;
    width: 100%;
    height: 2px;
    background: rgba(191, 0, 255, 0.2);
    appearance: none;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 10px;
    height: 18px;
    background: var(--bp-accent);
    border: 1px solid var(--bp-bg);
    cursor: pointer;
    box-shadow: 0 0 5px var(--bp-accent);
}

/* View Mode Controls */
.btn-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.btn {
    background: transparent;
    border: 1px solid rgba(191, 0, 255, 0.4);
    color: var(--bp-text);
    padding: 8px 12px;
    font-family: 'Space Mono', monospace;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    text-transform: uppercase;
}

.btn:hover {
    background: rgba(191, 0, 255, 0.1);
    border-color: var(--bp-accent);
}

.btn.active {
    background: rgba(191, 0, 255, 0.2);
    border-color: var(--bp-accent);
    color: #fff;
    box-shadow: 0 0 8px rgba(191, 0, 255, 0.3);
}

.btn-accent {
    border-color: var(--bp-warn);
    color: var(--bp-warn);
    grid-column: span 2;
    font-weight: bold;
    margin-top: 10px;
}

.btn-accent:hover {
    background: rgba(255, 170, 0, 0.1);
    border-color: var(--bp-warn);
}

/* Checkbox lists */
.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.75rem;
    padding: 4px 0;
}

.toggle-row input[type="checkbox"] {
    appearance: none;
    width: 14px;
    height: 14px;
    border: 1px solid rgba(191, 0, 255, 0.4);
    background: transparent;
    cursor: pointer;
    position: relative;
    outline: none;
}

.toggle-row input[type="checkbox"]:checked {
    background: var(--bp-accent);
    box-shadow: 0 0 5px var(--bp-accent);
}

.toggle-row input[type="checkbox"]:checked::after {
    content: "✓";
    color: #fff;
    font-size: 10px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: bold;
}

/* Specs Sheet on Right */
.spec-item {
    border-bottom: 1px dashed rgba(191, 0, 255, 0.1);
    padding: 8px 0;
    font-size: 0.75rem;
    display: flex;
    justify-content: space-between;
}
.spec-label {
    color: rgba(255,255,255,0.5);
}
.spec-val {
    color: #fff;
}

/* Bottom Status Block */
footer {
    background: rgba(11, 26, 48, 0.95);
    border-top: 2px solid var(--bp-accent);
    padding: 8px 24px;
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    font-size: 0.7rem;
    color: var(--bp-accent-dim);
    align-items: center;
    z-index: 10;
}

.status-left {
    display: flex;
    align-items: center;
    gap: 15px;
}
.status-dot {
    width: 6px;
    height: 6px;
    background-color: var(--bp-accent);
    border-radius: 50%;
    animation: blink 2s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 1; box-shadow: 0 0 6px var(--bp-accent); }
}

/* Leader Line overlays in CSS/SVG */
.leader-label {
    position: absolute;
    background: rgba(11, 26, 48, 0.9);
    border: 1px solid var(--bp-accent);
    color: #fff;
    padding: 2px 6px;
    font-size: 0.65rem;
    border-radius: 2px;
    pointer-events: none;
    white-space: nowrap;
    box-shadow: 0 0 5px rgba(191, 0, 255, 0.2);
}

/* Tabs System Layout */
.tab-container {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-bottom: 15px;
    border-bottom: 1px solid rgba(191, 0, 255, 0.2);
    padding-bottom: 8px;
}

.tab-btn {
    background: transparent;
    border: 1px solid rgba(191, 0, 255, 0.25);
    color: rgba(255, 255, 255, 0.6);
    padding: 6px 10px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn:hover {
    border-color: var(--bp-accent);
    color: #fff;
}

.tab-btn.active {
    background: rgba(191, 0, 255, 0.15);
    border-color: var(--bp-accent);
    color: var(--bp-accent);
    text-shadow: 0 0 4px rgba(191, 0, 255, 0.5);
    font-weight: bold;
}

/* Tab content panels */
.tab-content-panel {
    display: none;
}

.tab-content-panel.active {
    display: block;
}

/* Numeric Input styling */
.param-num-input {
    background: transparent;
    border: 1px dashed rgba(191, 0, 255, 0.3);
    color: var(--bp-line);
    font-family: 'Space Mono', monospace;
    font-size: 0.75rem;
    font-weight: bold;
    width: 55px;
    text-align: right;
    padding: 1px 4px;
    outline: none;
    border-radius: 2px;
    transition: all 0.2s;
}
.param-num-input:focus {
    border: 1px solid var(--bp-accent);
    background: rgba(191, 0, 255, 0.05);
}
.param-num-input::-webkit-outer-spin-button,
.param-num-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.param-num-input[type=number] {
    -moz-appearance: textfield;
}

/* Glassmorphic Tooltips for Sliders */
.slider-tooltip {
    position: absolute;
    background: rgba(11, 26, 48, 0.95);
    border: 1px solid var(--bp-accent);
    color: var(--bp-text);
    padding: 8px 12px;
    font-size: 0.7rem;
    font-family: 'Space Mono', monospace;
    border-radius: 4px;
    pointer-events: none;
    z-index: 10000;
    box-shadow: 0 0 15px rgba(191, 0, 255, 0.25);
    backdrop-filter: blur(10px);
    width: 230px;
    line-height: 1.4;
    transition: opacity 0.15s ease-in-out;
    opacity: 0;
    display: none;
}
.slider-tooltip .tooltip-title {
    font-family: 'Share Tech Mono', monospace;
    color: var(--bp-warn);
    font-weight: bold;
    margin-bottom: 4px;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
}
.slider-tooltip .tooltip-desc {
    color: rgba(255, 255, 255, 0.85);
}