/* ══════════════════════════════════════════════════════════
   emg_robotic_arm.html  ·  page-specific styles
   ══════════════════════════════════════════════════════════ */

/* ─── Common stack used on slides 1 and 2 ─── */
.assemble-stack,
.arm-stack {
    display: flex;
    flex-direction: column;
    gap: 14px;
    width: 100%;
    max-width: 920px;
    padding-top: 18px;
}

.tray-wrap,
.chain-wrap {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-panel);
    padding: 12px 14px;
}

.tray-label,
.chain-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 10px;
}

/* ─── Tray of source blocks (slide 1) ─── */
.block-tray {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    min-height: 56px;
}

/* ─── Chain of slots ─── */
.block-chain {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    min-height: 72px;
}

.chain-slot {
    flex: 0 0 auto;
    min-width: 100px;
    height: 64px;
    border: 1.5px dashed var(--border);
    border-radius: 10px;
    background: var(--bg-2);
    display: grid;
    place-items: center;
    text-align: center;
    position: relative;
    transition: border-color 0.12s, background 0.12s;
}
.chain-slot.over {
    border-color: var(--accent);
    background: var(--accent-soft-faint);
}
.chain-slot .slot-num {
    position: absolute;
    top: 4px;
    left: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    color: var(--muted);
    letter-spacing: 0.10em;
}
.chain-slot.filled {
    border-style: solid;
}
.chain-slot.correct {
    border-color: var(--c-correct);
    background: color-mix(in srgb, var(--c-correct) 12%, var(--bg-2));
}
.chain-slot.wrong {
    border-color: var(--c-wrong);
    background: color-mix(in srgb, var(--c-wrong) 10%, var(--bg-2));
}

.chain-arrow {
    flex: 0 0 auto;
    width: 14px;
    color: var(--muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    text-align: center;
    user-select: none;
}

/* ─── Endcap chips that bracket the chain ─── */
.chain-endcap {
    flex: 0 0 auto;
    min-width: 84px;
    height: 64px;
    padding: 0 10px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--bg-2);
    display: grid;
    place-items: center;
    text-align: center;
}
.chain-endcap .top {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 2px;
}
.chain-endcap .name {
    font-size: 12px;
    font-weight: 600;
    color: var(--fg);
    line-height: 1.15;
}

/* ─── Block tile (in tray, in slot, or in editable chain) ─── */
.block-tile {
    flex: 0 0 auto;
    min-width: 96px;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-2);
    cursor: grab;
    user-select: none;
    text-align: center;
    transition: border-color 0.12s, background 0.12s, transform 0.08s;
}
.block-tile:hover {
    border-color: var(--border-hover);
}
.block-tile:active {
    cursor: grabbing;
    transform: scale(0.98);
}
.block-tile.dragging {
    opacity: 0.4;
}
.block-tile .ttl {
    font-family: 'JetBrains Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.10em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 2px;
}
.block-tile .name {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--fg);
    line-height: 1.2;
}

/* In-slot tile takes the slot's full size */
.chain-slot .block-tile {
    width: 100%;
    height: 100%;
    margin: 0;
    border: none;
    background: transparent;
    display: grid;
    place-items: center;
    padding: 4px 8px;
}

/* ─── Lab dashboard (slide 2) ─── */
.slide.lab {
    grid-template-columns: 1fr;
    padding: 56px 18px 72px;
    overflow-y: auto;
    max-width: none;
    align-items: stretch;
}
.slide.lab > .lab-view {
    width: 100%;
    min-height: calc(100vh - 128px);
    height: 100%;
}
.lab-view {
    display: grid;
    grid-template-columns: minmax(300px, 24%) minmax(0, 1fr) minmax(280px, 22%);
    grid-template-rows: auto minmax(0, 1fr) auto;
    grid-template-areas:
        "toolbar toolbar  toolbar"
        "plots   hand     sidebar"
        "chain   chain    chain";
    gap: 12px;
}
.lab-toolbar { grid-area: toolbar; justify-content: center; }
.lab-plots {
    grid-area: plots;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 0;
}
.lab-plots .lab-plot {
    flex: 1 1 0;
    min-height: 140px;
    aspect-ratio: auto;
}
.lab-hand {
    grid-area: hand;
    position: relative;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-2);
    overflow: hidden;
    min-height: 0;
}
.lab-hand #arm-three {
    position: absolute;
    inset: 0;
}
.lab-hand #arm-three canvas {
    display: block;
    width: 100% !important;
    height: 100% !important;
}
.lab-sidebar {
    grid-area: sidebar;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 0;
}
.lab-sidebar .webcam-panel { flex: 0 0 auto; }
.lab-sidebar .finger-controls { flex: 1 1 0; min-height: 0; }
.lab-chain {
    grid-area: chain;
    display: grid;
    grid-template-columns: minmax(240px, 0.85fr) minmax(0, 2fr);
    gap: 10px;
}
.lab-chain .tray-wrap,
.lab-chain .chain-wrap {
    margin: 0;
}
.lab-chain .block-tray { min-height: 56px; }
.lab-chain .block-chain { min-height: 64px; }

@media (max-width: 1100px) {
    .lab-view {
        grid-template-columns: 1fr;
        grid-template-areas:
            "toolbar"
            "hand"
            "plots"
            "sidebar"
            "chain";
    }
    .lab-plots .lab-plot { aspect-ratio: 3 / 1; }
    .lab-chain { grid-template-columns: 1fr; }
}

/* ─── Per-finger trace colours ─── */
svg.ov .trace.f-thumb  { stroke: var(--c-input); }
svg.ov .trace.f-index  { stroke: var(--c-output); }
svg.ov .trace.f-middle { stroke: var(--c-output2); }
svg.ov .trace.f-ring   { stroke: var(--c-thresh); }
svg.ov .trace.f-pinky  { stroke: var(--c-pre); }

/* In overlay mode all five traces share one y-axis; thin them slightly and drop
   opacity so overlapping curves remain distinguishable. */
svg.ov.mode-overlay .trace {
    stroke-opacity: 0.62;
    stroke-width: 1.7;
}

/* ─── Compact overlay/stacked toggle, lives in the top bar above the plots ─── */
.lab-plots-header {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2px 0 0;
}
.plot-toggle {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--bg-panel);
    font-family: 'JetBrains Mono', monospace;
    font-size: 9.5px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--muted);
    cursor: pointer;
    user-select: none;
    transition: border-color 0.12s;
}
.plot-toggle:hover { border-color: var(--border-hover); }
.plot-toggle:focus-visible {
    outline: none;
    border-color: var(--accent);
}
.plot-toggle .opt {
    padding: 1px 4px;
    border-radius: 999px;
    color: var(--muted);
    transition: color 0.12s, background 0.12s;
}
.plot-toggle .opt.active {
    color: var(--accent);
    background: var(--accent-soft);
}
.plot-toggle .sep {
    color: var(--border);
    pointer-events: none;
}

/* ─── Per-lane labels and lane dividers on the stacked trace plots ─── */
svg.ov .lane-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10.5px;
    letter-spacing: 0.10em;
    text-transform: uppercase;
}
svg.ov .lane-label.f-thumb  { fill: var(--c-input); }
svg.ov .lane-label.f-index  { fill: var(--c-output); }
svg.ov .lane-label.f-middle { fill: var(--c-output2); }
svg.ov .lane-label.f-ring   { fill: var(--c-thresh); }
svg.ov .lane-label.f-pinky  { fill: var(--c-pre); }
svg.ov .grid line.lane-sep {
    stroke: var(--border);
    stroke-width: 1;
}
svg.ov .grid line.lane-zero {
    stroke: var(--grid-line);
    stroke-width: 1;
    stroke-dasharray: 2 3;
    opacity: 0.6;
}

/* ─── Sensor row + webcam panel ─── */
.sensor-panel {
    display: grid;
    grid-template-columns: minmax(220px, 1fr) minmax(0, 1.05fr);
    gap: 14px;
    align-items: stretch;
}
.finger-controls {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-panel);
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.finger-row {
    display: grid;
    grid-template-columns: 18px 12px 56px 1fr 44px;
    align-items: center;
    gap: 10px;
    padding: 4px 6px;
    border-radius: 8px;
    cursor: pointer;
    user-select: none;
    transition: background 0.12s, opacity 0.12s;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-dim);
}
.finger-row:hover { background: var(--pill-bg); }
.finger-row.disabled { opacity: 0.4; }
.finger-row input[type="checkbox"] {
    accent-color: var(--accent);
    margin: 0;
}
.finger-row .swatch {
    width: 10px; height: 10px; border-radius: 50%;
    background: var(--muted);
    box-shadow: 0 0 0 1px var(--bg-2) inset;
}
.finger-row.f-thumb  .swatch { background: var(--c-input); }
.finger-row.f-index  .swatch { background: var(--c-output); }
.finger-row.f-middle .swatch { background: var(--c-output2); }
.finger-row.f-ring   .swatch { background: var(--c-thresh); }
.finger-row.f-pinky  .swatch { background: var(--c-pre); }
.finger-row .name {
    color: var(--fg);
    letter-spacing: 0.10em;
    text-transform: uppercase;
    font-size: 10.5px;
}
.finger-row .bar {
    position: relative;
    height: 6px;
    background: var(--slider-track);
    border-radius: 999px;
    overflow: hidden;
}
.finger-row .bar .fill {
    position: absolute; left: 0; top: 0; bottom: 0;
    width: 0%;
    background: var(--muted);
    transition: width 0.05s linear;
}
.finger-row.f-thumb  .bar .fill { background: var(--c-input); }
.finger-row.f-index  .bar .fill { background: var(--c-output); }
.finger-row.f-middle .bar .fill { background: var(--c-output2); }
.finger-row.f-ring   .bar .fill { background: var(--c-thresh); }
.finger-row.f-pinky  .bar .fill { background: var(--c-pre); }
.finger-row .val { color: var(--fg); text-align: right; font-size: 11px; }

.finger-divider {
    height: 1px;
    background: var(--border);
    margin: 6px 4px;
}
.finger-row.finger-row-rot .swatch { background: var(--accent); }
.finger-row.finger-row-rot .bar .fill { background: var(--accent); width: 0%; }
.finger-row.finger-row-rot .name { color: var(--accent); }
.finger-row.finger-row-rot.disabled { opacity: 0.55; }
.finger-row.finger-row-rot:not(.disabled) .bar .fill { width: 100%; }

.webcam-panel {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--bg-panel);
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 0;
}
.webcam-panel .header {
    display: flex; align-items: center; gap: 10px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px; letter-spacing: 0.12em;
    text-transform: uppercase; color: var(--muted);
}
.webcam-panel .header .status { color: var(--accent); }
.webcam-panel .frame {
    position: relative;
    aspect-ratio: 4 / 3;
    background: #000;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border);
}
.webcam-panel .frame .placeholder {
    position: absolute; inset: 0;
    display: grid; place-items: center;
    color: var(--muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px; letter-spacing: 0.10em;
    text-transform: uppercase;
}
.webcam-panel .frame canvas.handpose-canvas {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
    display: block;
}

@media (max-width: 1100px) {
    .sensor-panel { grid-template-columns: 1fr; }
}

/* The editable chain on slide 2 hides the slot numbers and uses solid borders */
.block-chain.editable .chain-slot {
    border-style: solid;
}
.block-chain.editable .chain-slot .slot-num {
    display: none;
}

/* Use a wider plot column on slide 2 so the arm canvas reads well */
.slide:has(.arm-three-box) {
    grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.7fr);
}
.slide:has(.arm-three-box) .arm-stack {
    max-width: 1080px;
}

@media (max-width: 1000px) {
    .slide:has(.arm-three-box) {
        grid-template-columns: 1fr;
    }
    .chain-slot,
    .chain-endcap {
        min-width: 90px;
    }
}