:root {
    --bg-dark: #070a0e;
    --panel-bg: rgba(10, 15, 24, 0.88);
    --panel-border: rgba(0, 255, 170, 0.22);
    --panel-border-glow: rgba(0, 255, 170, 0.12);
    --accent-cyan: #00f0ff;
    --accent-green: #00ffaa;
    --accent-amber: #ffaa00;
    --accent-red: #ff3366;
    --text-main: #e2e8f0;
    --text-dim: #718096;
    --text-highlight: #ffffff;
    --font-mono: 'JetBrains Mono', monospace, monospace;
    --font-sans: 'Space Grotesk', system-ui, sans-serif;
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-mono);
    user-select: none;
    -webkit-font-smoothing: antialiased;
}

#app-container {
    display: flex;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
    position: relative;
}

/* ==========================================================================
   Top Navigation & Header Bar
   ========================================================================== */
#top-bar {
    height: 52px;
    background: rgba(8, 12, 18, 0.95);
    border-bottom: 1px solid var(--panel-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.25rem;
    z-index: 100;
    backdrop-filter: blur(8px);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-green);
    box-shadow: 0 0 10px var(--accent-green);
    animation: pulse-glow 2s infinite ease-in-out;
}

@keyframes pulse-glow {
    0%, 100% { opacity: 0.6; transform: scale(0.9); }
    50% { opacity: 1.0; transform: scale(1.15); box-shadow: 0 0 14px var(--accent-green); }
}

.brand-title {
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0.12em;
    color: var(--accent-green);
    text-shadow: 0 0 8px rgba(0, 255, 170, 0.4);
}

.brand-subtitle {
    font-size: 0.72rem;
    color: var(--text-dim);
    letter-spacing: 0.08em;
}

.top-controls {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    overflow-x: auto;
    scrollbar-width: none;
}
.top-controls::-webkit-scrollbar {
    display: none;
}

button {
    font-family: var(--font-mono);
    cursor: pointer;
}

.btn-toggle, .btn-action, .btn-nav {
    background: rgba(18, 26, 38, 0.85);
    border: 1px solid rgba(0, 255, 170, 0.25);
    color: var(--text-main);
    font-size: 0.75rem;
    padding: 0.38rem 0.75rem;
    border-radius: 3px;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    text-decoration: none;
}

.btn-toggle:hover, .btn-action:hover, .btn-nav:hover {
    background: rgba(0, 255, 170, 0.12);
    border-color: var(--accent-green);
    color: #fff;
    box-shadow: 0 0 10px rgba(0, 255, 170, 0.25);
}

.btn-toggle.active {
    background: rgba(0, 240, 255, 0.16);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
}

.btn-nav {
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--text-dim);
}

.btn-nav:hover {
    border-color: #fff;
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

/* ==========================================================================
   Main Viewport & Interactive Canvas
   ========================================================================== */
#viewport {
    flex: 1;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at 50% 50%, #0c1420 0%, #06090d 100%);
}

#lbm-canvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
}

/* ==========================================================================
   Telemetry Floating HUD Bar
   ========================================================================== */
#telemetry-bar {
    position: absolute;
    bottom: 20px;
    left: 360px; /* Offset from sidebar */
    right: 30px;
    background: rgba(9, 14, 22, 0.88);
    border: 1px solid var(--panel-border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6), 0 0 15px var(--panel-border-glow);
    backdrop-filter: blur(12px);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding: 0.65rem 1.25rem;
    z-index: 50;
    pointer-events: none;
}

.telemetry-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.18rem;
}

.t-label {
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: var(--text-dim);
}

.t-val {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-highlight);
    letter-spacing: 0.05em;
}

.highlight-amber {
    color: var(--accent-amber);
    text-shadow: 0 0 8px rgba(255, 170, 0, 0.4);
}

.highlight-cyan {
    color: var(--accent-cyan);
    text-shadow: 0 0 8px rgba(0, 240, 255, 0.4);
}

/* ==========================================================================
   Left Interactive Control Sidebar Drawer
   ========================================================================== */
#sidebar {
    position: absolute;
    top: 52px;
    left: 0;
    bottom: 0;
    width: 330px;
    background: var(--panel-bg);
    border-right: 1px solid var(--panel-border);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(16px);
    padding: 1.2rem 1rem;
    overflow-y: auto;
    z-index: 60;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

#sidebar::-webkit-scrollbar {
    width: 4px;
}
#sidebar::-webkit-scrollbar-thumb {
    background: rgba(0, 255, 170, 0.2);
    border-radius: 2px;
}

.panel-section {
    background: rgba(14, 21, 32, 0.6);
    border: 1px solid rgba(0, 255, 170, 0.15);
    border-radius: 4px;
    padding: 0.85rem 0.8rem;
}

.panel-section h3 {
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    color: var(--accent-green);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    border-bottom: 1px solid rgba(0, 255, 170, 0.15);
    padding-bottom: 0.35rem;
}

/* Preset Buttons Grid */
.preset-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem;
    margin-bottom: 0.65rem;
}

.preset-btn {
    background: rgba(20, 30, 45, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--text-main);
    padding: 0.45rem 0.4rem;
    font-size: 0.7rem;
    border-radius: 3px;
    letter-spacing: 0.04em;
    transition: all 0.18s ease;
    text-align: center;
}

.preset-btn:hover {
    background: rgba(0, 255, 170, 0.15);
    border-color: var(--accent-green);
    color: #fff;
}

.preset-btn.active {
    background: rgba(0, 240, 255, 0.2);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    font-weight: 600;
    box-shadow: inset 0 0 8px rgba(0, 240, 255, 0.25);
}

/* Radio Cards (Visualization Modes) */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    margin-bottom: 0.75rem;
}

.radio-card {
    display: flex;
    align-items: center;
    background: rgba(18, 26, 40, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0.4rem 0.6rem;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.18s ease;
}

.radio-card input {
    margin-right: 0.5rem;
    accent-color: var(--accent-cyan);
}

.radio-card .card-text {
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    color: var(--text-main);
}

.radio-card.active, .radio-card:has(input:checked) {
    border-color: var(--accent-cyan);
    background: rgba(0, 240, 255, 0.12);
}

.radio-card:has(input:checked) .card-text {
    color: var(--accent-cyan);
    font-weight: 600;
}

/* Control Sliders & Rows */
.control-row {
    margin-bottom: 0.65rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.control-row:last-child {
    margin-bottom: 0;
}

.label-val {
    display: flex;
    justify-content: space-between;
    font-size: 0.68rem;
    letter-spacing: 0.05em;
}

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

.label-val span {
    color: var(--text-highlight);
    font-weight: 600;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
    outline: none;
    margin: 0.3rem 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent-green);
    cursor: pointer;
    box-shadow: 0 0 6px var(--accent-green);
    transition: transform 0.1s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.3);
}

.styled-select {
    width: 100%;
    background: rgba(18, 26, 40, 0.9);
    border: 1px solid rgba(0, 255, 170, 0.25);
    color: var(--text-main);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    padding: 0.35rem 0.5rem;
    border-radius: 3px;
    outline: none;
}

.styled-select:focus {
    border-color: var(--accent-cyan);
}

/* Tool Buttons (Draw / Erase / Pulse) */
.tool-btn-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.35rem;
    margin-bottom: 0.65rem;
}

.tool-btn {
    background: rgba(18, 26, 40, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--text-dim);
    font-size: 0.68rem;
    padding: 0.4rem 0.2rem;
    border-radius: 3px;
    text-align: center;
    transition: all 0.18s ease;
}

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

.tool-btn.active {
    background: rgba(255, 170, 0, 0.16);
    border-color: var(--accent-amber);
    color: var(--accent-amber);
    font-weight: 600;
}

/* Artifact Relic Box */
.artifact-box {
    border-color: rgba(255, 170, 0, 0.35);
    background: rgba(25, 20, 10, 0.6);
}

.artifact-box h4 {
    font-size: 0.78rem;
    color: var(--accent-amber);
    margin: 0.3rem 0;
}

.artifact-tag {
    font-size: 0.58rem;
    padding: 0.1rem 0.3rem;
    background: rgba(255, 170, 0, 0.2);
    border-radius: 2px;
    color: var(--accent-amber);
    letter-spacing: 0.1em;
}

.artifact-desc {
    font-size: 0.68rem;
    line-height: 1.45;
    color: #cbd5e0;
    margin-bottom: 0.5rem;
}

.relic-link {
    font-size: 0.68rem;
    color: var(--accent-cyan);
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: color 0.15s ease;
}

.relic-link:hover {
    color: #fff;
    text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 900px) {
    #sidebar {
        width: 280px;
    }
    #telemetry-bar {
        left: 290px;
        flex-wrap: wrap;
        gap: 0.5rem;
    }
}