:root {
    --sleeve-color: #1fb6ff; /* Cyan/Blue like DSG Active */
    --ring-color: #f59e0b;   /* Amber/Gold */
    --gear-color: #475569;   /* Slate-600 */
    --bg-color: #0b1220;     /* Dark Background */
    --panel-bg: #0f1828;     /* Panel Background */
    --text-color: #e6edf5;   /* Light Text */
    --border-color: #1f2c3e; /* Dark Border */
}

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    margin: 0;
    padding: 20px;
    min-height: 100vh;
}

/* Header with Back Button */
.header-bar {
    width: 100%;
    max-width: 1200px;
    display: flex;
    align-items: center;
    gap: 15px;
    margin: 0 auto 20px auto;
    background-color: var(--panel-bg);
    padding: 15px 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 14px 30px rgba(0,0,0,0.35);
    box-sizing: border-box;
}
.back-btn {
    color: #9ca8bb;
    font-size: 1.2rem;
    text-decoration: none;
    transition: color 0.2s;
}
.back-btn:hover { color: #1fb6ff; }

h2 { margin: 0; color: #e6edf5; font-size: 1.5rem; }
p.subtitle { margin-top: 5px; color: #9ca8bb; font-size: 0.9rem; margin-bottom: 0; }

/* Layout */
.content-card {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    box-sizing: border-box;
    background-color: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 14px 30px rgba(0,0,0,0.35);
}
.main-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 100%;
    box-sizing: border-box;
}

@media (min-width: 1024px) {
    .main-container { 
        display: grid; 
        grid-template-columns: 1fr 350px; 
        align-items: stretch;
    }
}

@media (max-width: 600px) {
    body { padding: 10px; }
    .header-bar { padding: 15px; flex-direction: column; align-items: flex-start; gap: 10px; }
    .header-bar .back-btn { align-self: flex-end; margin-top: -30px; }
}

.vis-column {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.view-box {
    background: #0f1a2a; /* Darker for canvas bg */
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 15px;
    box-shadow: inset 0 0 12px rgba(0,0,0,0.35);
    position: relative;
}
.view-label {
    position: absolute; top: 10px; left: 10px;
    font-size: 12px; font-weight: bold; text-transform: uppercase; color: #9ca8bb;
    background: rgba(15, 24, 40, 0.9); padding: 2px 8px; border-radius: 4px;
    border: 1px solid var(--border-color);
}

canvas { width: 100%; height: 100%; display: block; }
#canvas-cross-section { height: 180px; }
#canvas-teeth { height: 250px; cursor: ew-resize; }

.controls-column {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.control-panel {
    background: var(--panel-bg);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 12px 30px rgba(0,0,0,0.35);
}

.slider-group { margin-bottom: 25px; }
.slider-label { display: flex; justify-content: space-between; margin-bottom: 8px; font-weight: 600; font-size: 0.9rem; color: #e6edf5; }
.slider-value { color: var(--sleeve-color); font-family: monospace; }

input[type=range] {
    width: 100%;
    -webkit-appearance: none;
    height: 6px;
    background: #1f2c3e;
    border-radius: 3px;
    outline: none;
}
input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px; height: 20px;
    border-radius: 50%;
    cursor: pointer;
    margin-top: -7px;
    border: 2px solid #0b1220;
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
}
#slider-shift::-webkit-slider-thumb { background: var(--sleeve-color); box-shadow: 0 0 12px rgba(31,182,255,0.5); }
#slider-speed::-webkit-slider-thumb { background: #94a3b8; }

.status-box {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 10px;
}
.indicator {
    padding: 10px;
    border-radius: 6px;
    text-align: center;
    font-size: 0.85rem;
    font-weight: bold;
    transition: all 0.3s;
    border: 1px solid transparent;
}
.state-neutral { background-color: #111a29; color: #94a3b8; border-color: #1f2c3e; }
.state-sync { background-color: rgba(245, 158, 11, 0.15); color: #f59e0b; border-color: rgba(245, 158, 11, 0.3); }
.state-blocked { background-color: rgba(220, 38, 38, 0.15); color: #ef4444; border-color: rgba(220, 38, 38, 0.3); animation: pulse-red 1s infinite; }
.state-engaged { background-color: rgba(34, 197, 94, 0.15); color: #22c55e; border-color: rgba(34, 197, 94, 0.3); }

@keyframes pulse-red {
    0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    70% { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
    100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.legend {
    display: flex;
    gap: 15px;
    font-size: 0.8rem;
    margin-top: 10px;
    justify-content: center;
    color: #9ca8bb;
}
.legend-item { display: flex; align-items: center; gap: 5px; }
.dot { width: 10px; height: 10px; border-radius: 2px; }

.explanation {
    font-size: 0.9rem;
    line-height: 1.5;
    color: #cbd5e1;
    background: #111a29;
    border-left: 4px solid #1fb6ff;
    padding: 10px;
    margin-top: 15px;
    border-radius: 0 4px 4px 0;
}