:root {
    --bp-bg: #02090b;
    --bp-grid: rgba(0, 243, 255, 0.05);
    --bp-grid-major: rgba(0, 243, 255, 0.15);
    --bp-line: #00f3ff;
    --bp-line-dim: rgba(0, 243, 255, 0.35);
    --bp-text: #e0fbfc;
    --bp-text-dim: #7f9ea8;
    --bp-accent: #c8ff00;
    --bp-accent-pink: #ff007f;
    --bp-accent-orange: #ffaa00;
    --bp-panel-bg: rgba(4, 14, 20, 0.92);
    --bp-border: 1px solid rgba(0, 243, 255, 0.25);
    --bp-border-bright: 1px solid #00f3ff;
}

* {
    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;
}

/* Blueprint Corner Border Overlay */
.blueprint-border {
    position: absolute;
    top: 8px;
    left: 8px;
    right: 8px;
    bottom: 8px;
    border: 2px solid var(--bp-line);
    pointer-events: none;
    z-index: 999;
    opacity: 0.5;
}

/* Header */
header {
    padding: 12px 24px;
    background: rgba(2, 9, 11, 0.96);
    border-bottom: 2px solid var(--bp-line);
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 20px rgba(0, 243, 255, 0.15);
}

.title-block {
    display: flex;
    align-items: center;
    gap: 16px;
}

.drawing-number {
    border: 1px solid var(--bp-line);
    padding: 4px 8px;
    font-size: 0.8rem;
    color: var(--bp-line);
    background: rgba(0, 243, 255, 0.08);
    font-weight: bold;
    letter-spacing: 1px;
}

h1 {
    font-family: 'Share Tech Mono', monospace;
    font-size: 1.4rem;
    letter-spacing: 1.5px;
    color: #fff;
    text-shadow: 0 0 10px rgba(0, 243, 255, 0.6);
}

.tags-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.tag {
    font-size: 0.7rem;
    padding: 3px 8px;
    border: 1px solid var(--bp-line-dim);
    border-radius: 3px;
    background: rgba(0, 243, 255, 0.05);
    color: var(--bp-text);
    text-transform: uppercase;
}

.tag.accent {
    border-color: var(--bp-accent);
    color: var(--bp-accent);
    background: rgba(200, 255, 0, 0.1);
}

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

.header-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #00ff88;
    box-shadow: 0 0 8px #00ff88;
}

/* Main Workspace */
main {
    display: grid;
    grid-template-columns: 380px 1fr;
    height: 100%;
    overflow: hidden;
    position: relative;
}

/* Left Parameter Panel */
.panel {
    background: var(--bp-panel-bg);
    border-right: 1px solid rgba(0, 243, 255, 0.3);
    backdrop-filter: blur(12px);
    display: flex;
    flex-direction: column;
    height: 100%;
    z-index: 5;
    overflow: hidden;
}

.panel-header {
    padding: 12px 18px;
    border-bottom: 1px solid rgba(0, 243, 255, 0.2);
    font-size: 0.85rem;
    font-weight: bold;
    color: var(--bp-line);
    letter-spacing: 1px;
    background: rgba(0, 243, 255, 0.05);
}

.panel-content {
    padding: 16px;
    overflow-y: auto;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* Scrollbar */
.panel-content::-webkit-scrollbar {
    width: 6px;
}
.panel-content::-webkit-scrollbar-thumb {
    background: rgba(0, 243, 255, 0.3);
    border-radius: 3px;
}

/* Control Groups */
.control-group {
    background: rgba(2, 9, 14, 0.6);
    border: 1px solid rgba(0, 243, 255, 0.15);
    border-radius: 4px;
    padding: 12px;
}

.control-group-title {
    font-size: 0.75rem;
    font-weight: bold;
    color: var(--bp-line);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 1px dashed rgba(0, 243, 255, 0.2);
    padding-bottom: 4px;
}

.control-group-title.lime {
    color: var(--bp-accent);
    border-color: rgba(200, 255, 0, 0.3);
}

.control-group-title.pink {
    color: var(--bp-accent-pink);
    border-color: rgba(255, 0, 127, 0.3);
}

.param-row {
    margin-bottom: 10px;
}
.param-row:last-child {
    margin-bottom: 0;
}

.param-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.72rem;
    margin-bottom: 4px;
}

.param-label {
    color: var(--bp-text-dim);
}

.param-value {
    color: var(--bp-line);
    font-weight: bold;
}

/* Inputs */
input[type="range"] {
    width: 100%;
    height: 4px;
    background: rgba(0, 243, 255, 0.2);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--bp-line);
    box-shadow: 0 0 8px var(--bp-line);
    cursor: pointer;
}

select.select-input {
    width: 100%;
    padding: 6px 10px;
    background: rgba(6, 16, 24, 0.95);
    border: 1px solid rgba(0, 243, 255, 0.3);
    color: var(--bp-line);
    font-family: inherit;
    font-size: 0.75rem;
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

/* Buttons */
.btn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin-top: 6px;
}

.btn {
    padding: 7px 10px;
    background: rgba(0, 243, 255, 0.08);
    border: 1px solid rgba(0, 243, 255, 0.3);
    color: var(--bp-line);
    font-family: inherit;
    font-size: 0.7rem;
    cursor: pointer;
    border-radius: 3px;
    transition: all 0.15s ease;
    text-align: center;
}

.btn:hover {
    background: rgba(0, 243, 255, 0.2);
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.3);
    color: #fff;
}

.btn.active {
    background: var(--bp-line);
    color: #02090b;
    font-weight: bold;
    box-shadow: 0 0 12px var(--bp-line);
}

.btn.primary {
    background: rgba(0, 243, 255, 0.15);
    border-color: var(--bp-line);
    font-weight: bold;
}

.btn.pink {
    border-color: var(--bp-accent-pink);
    color: var(--bp-accent-pink);
    background: rgba(255, 0, 127, 0.1);
}
.btn.pink:hover {
    background: rgba(255, 0, 127, 0.25);
    box-shadow: 0 0 10px rgba(255, 0, 127, 0.4);
}

.btn.lime {
    border-color: var(--bp-accent);
    color: var(--bp-accent);
    background: rgba(200, 255, 0, 0.1);
}
.btn.lime:hover {
    background: rgba(200, 255, 0, 0.25);
    box-shadow: 0 0 10px rgba(200, 255, 0, 0.4);
}

/* Viewport Area */
#viewport-container {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

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

#dimensions-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 4;
}

/* Live Stats Overlay */
.overlay-stats {
    position: absolute;
    top: 16px;
    right: 20px;
    background: rgba(2, 10, 16, 0.85);
    border: 1px solid rgba(0, 243, 255, 0.3);
    padding: 12px 16px;
    border-radius: 4px;
    font-size: 0.72rem;
    display: flex;
    flex-direction: column;
    gap: 6px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    z-index: 6;
}

.overlay-stats div {
    display: flex;
    justify-content: space-between;
    gap: 16px;
}

.overlay-stats span {
    color: var(--bp-line);
    font-weight: bold;
}

/* Callout badge for fan & relief */
.feature-badge-row {
    position: absolute;
    bottom: 20px;
    left: 20px;
    display: flex;
    gap: 10px;
    z-index: 6;
}

.feature-pill {
    background: rgba(2, 12, 18, 0.85);
    border: 1px solid rgba(0, 243, 255, 0.35);
    border-radius: 20px;
    padding: 6px 14px;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    gap: 6px;
    color: #e0fbfc;
}

.feature-pill.fan {
    border-color: #00f3ff;
}
.feature-pill.relief {
    border-color: #c8ff00;
    color: #c8ff00;
}
.feature-pill.screws {
    border-color: #ffaa00;
    color: #ffaa00;
}

/* Footer */
footer {
    padding: 8px 24px;
    background: rgba(2, 9, 11, 0.98);
    border-top: 1px solid rgba(0, 243, 255, 0.2);
    font-size: 0.7rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--bp-text-dim);
    z-index: 10;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

#kernel-status.active {
    color: #00ff88;
    font-weight: bold;
}