/* ==========================================================================
   HP 9872B Multi-Color Plotter Emulator - Design Stylesheet
   ========================================================================== */

/* 1. Global Reset & Theme Variables */
:root {
    /* Color Palette */
    --color-bg-dark: #000000;
    --color-chassis-light: #e0ddd6;
    --color-chassis-dark: #b8b5ac;
    --color-chassis-shadow: #5c5a54;
    --color-console-bg: #a8a59c;
    --color-console-border: #4c4b45;
    
    --color-paper: #faf9f6;
    --color-dark-recess: #1a1917;
    --color-metal: #85837d;
    --color-silver-badge: linear-gradient(135deg, #f3f4f6 0%, #d1d5db 30%, #9ca3af 70%, #f3f4f6 100%);
    
    /* LEDs */
    --led-red-off: #520b0b;
    --led-red-on: #ff2222;
    --led-orange-off: #5c3506;
    --led-orange-on: #ffa500;
    --led-power-off: #0b3d1b;
    --led-power-on: #00ff66;

    /* Pen Default Colors (customizable) */
    --pen-1-color: #1c1917; /* Black */
    --pen-2-color: #dc2626; /* Red */
    --pen-3-color: #16a34a; /* Green */
    --pen-4-color: #2563eb; /* Blue */
    --pen-5-color: #eab308; /* Yellow */
    --pen-6-color: #d946ef; /* Magenta */
    --pen-7-color: #0891b2; /* Cyan */
    --pen-8-color: #78350f; /* Brown */
    
    /* Sidebar */
    --sidebar-bg: rgba(18, 18, 18, 0.95);
    --sidebar-border: #2e2d28;
}

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

body {
    background-color: var(--color-bg-dark);
    color: #e5e7eb;
    font-family: 'Inter', sans-serif;
    height: 100vh;
    width: 100vw;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* 2. Main App Container & Scaled Plotter Grid */
.app-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-dark);
}

.plotter-chassis {
    position: relative;
    /* Aspect ratio: ~1.15 : 1 (width:depth) */
    width: min(95vw, 105vh * 1.15);
    height: calc(min(95vw, 105vh * 1.15) / 1.15);
    background: linear-gradient(135deg, var(--color-chassis-light) 0%, var(--color-chassis-dark) 100%);
    border: 6px solid var(--color-console-border);
    border-radius: 16px;
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.95),
        inset 0 2px 4px rgba(255, 255, 255, 0.5),
        inset 0 -4px 10px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    user-select: none;
}

/* Power Off State filter */
.plotter-chassis.power-off {
    filter: brightness(0.65) contrast(0.9);
}

/* 3. Top Frame Section */
.plotter-top-frame {
    height: 11%;
    border-bottom: 4px solid var(--color-console-border);
    background: linear-gradient(180deg, var(--color-chassis-light) 0%, var(--color-chassis-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 4%;
    box-shadow: inset 0 2px 2px rgba(255, 255, 255, 0.4);
}

.silver-badge {
    background: var(--color-silver-badge);
    border: 1.5px solid #7c7b75;
    border-radius: 4px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4px 16px;
    box-shadow: 
        inset 0 1px 1px #fff,
        0 2px 4px rgba(0, 0, 0, 0.25);
}

.badge-model {
    font-family: 'Outfit', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    color: #111827;
    letter-spacing: 1px;
    line-height: 1;
}

.badge-type {
    font-size: 0.45rem;
    font-weight: 600;
    color: #4b5563;
    letter-spacing: 2px;
    margin-top: 2px;
}

.chassis-power-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
}

.power-label {
    font-size: 0.55rem;
    font-weight: 700;
    color: #374151;
    letter-spacing: 1.5px;
}

/* LED Indicators */
.led {
    border-radius: 50%;
    border: 1px solid #1a1a1a;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.5);
    transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.led-power {
    width: 10px;
    height: 10px;
    background-color: var(--led-power-off);
}

.led-power.active {
    background-color: var(--led-power-on);
    box-shadow: 0 0 8px var(--led-power-on), inset 0 1px 1px rgba(255,255,255,0.8);
}

/* 4. Plotter Bed Recess (Drawing & Rails) */
.plotter-bed {
    flex-grow: 1;
    background-color: var(--color-dark-recess);
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 8px 16px rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2% 0;
}

/* Metal Guide Rails top/bottom */
.x-rail-shadow {
    position: absolute;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(180deg, #44433d, #22211e 50%, #44433d);
    border-top: 1px solid #111;
    border-bottom: 1px solid #555;
    z-index: 2;
}
.x-rail-shadow.top { top: 0; }
.x-rail-shadow.bottom { bottom: 0; }

/* Paper Bed Container */
.paper-bed-container {
    width: 86%;
    height: 94%;
    display: flex;
    align-items: flex-end; /* Reference point for paper loading is bottom-left */
    justify-content: flex-start;
    position: relative;
    z-index: 1;
}

#plotter-bed-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    image-rendering: pixelated;
}

.paper-sheet {
    background-color: var(--color-paper);
    position: relative;
    z-index: 1;
    border: 1px solid rgba(0, 0, 0, 0.18); /* Faint paper edge border */
    box-shadow: 
        0 10px 25px rgba(0, 0, 0, 0.75),
        inset 0 1px 1px rgba(255, 255, 255, 0.8);
    overflow: hidden;
}

/* Paper Corner Clamps */
.paper-clamp {
    position: absolute;
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, #7c7b75, #4d4c47);
    border: 1px solid #333;
    box-shadow: 0 1px 3px rgba(0,0,0,0.5);
    z-index: 3;
}
.paper-clamp.top-left { top: 0; left: 0; border-radius: 0 0 10px 0; }
.paper-clamp.top-right { top: 0; right: 0; border-radius: 0 0 0 10px; }
.paper-clamp.bottom-left { bottom: 0; left: 0; border-radius: 0 10px 0 0; }
.paper-clamp.bottom-right { bottom: 0; right: 0; border-radius: 10px 0 0 0; }

/* The HTML5 Drawing Canvases (Background & Foreground) */
.paper-sheet canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    image-rendering: pixelated;
}
#plotter-bg-canvas {
    z-index: 1;
}
#plotter-canvas {
    z-index: 2;
    background-color: transparent;
}

/* 5. Animated Carriages */
.x-carriage {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 4.5%; /* width of vertical bar */
    /* Starting point left aligns pen tip with coordinate 0. 
       This will be animated using translateX in percent of paper width. */
    left: 7%; /* Center alignment offset */
    background: linear-gradient(to right, #cfcdc6, #9b9991 25%, #4c4b45 75%, #cfcdc6);
    box-shadow: 
        -4px 0 15px rgba(0, 0, 0, 0.65), 
        4px 0 15px rgba(0, 0, 0, 0.65);
    z-index: 8;
    pointer-events: none;
    transition: transform 0.05s linear;
}

.x-carriage-track {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 45%;
    width: 10%;
    background: linear-gradient(to right, #555, #aaa, #333);
}

.y-carriage {
    position: absolute;
    left: -20%;
    width: 140%;
    /* Spans square */
    height: 5.5%;
    background: linear-gradient(135deg, #6b6a64 0%, #3a3934 100%);
    border: 1.5px solid #222;
    border-radius: 4px;
    box-shadow: 
        0 4px 8px rgba(0, 0, 0, 0.6),
        inset 0 1px 1px rgba(255,255,255,0.2);
    z-index: 9;
    transition: transform 0.05s linear;
}

.y-carriage-arm {
    position: absolute;
    top: 50%;
    left: -45%;
    width: 50%;
    height: 90%; /* Taller arm to connect and match the larger pen */
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.y-carriage-arm::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, #9b9991, #666);
    border: 1px solid #333;
    border-radius: 4px 0 0 4px;
    z-index: -1; /* Render metal bar behind pen casing child */
    clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 45% 100%, 45% 45%, 0% 45%);
}

.pen-casing {
    position: relative;
    z-index: 2;
    width: 26px; /* 11.5 mm equivalent */
    height: 26px;
    border-radius: 50%;
    background-color: #222;
    border: 1px solid #111;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.8);
}

.pen-tip {
    width: 18px; /* 8 mm equivalent */
    height: 18px;
    border-radius: 50%;
    box-shadow: 0 1px 2px rgba(0,0,0,0.5);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

/* Visual cue for Pen Down (slight scale pulse and tight shadow) */
.pen-tip.down {
    transform: scale(1.1);
    box-shadow: 0 0 1px rgba(0,0,0,0.9);
}

/* Carriage shadow on paper bed */
.y-carriage-shadow {
    position: absolute;
    top: 15%;
    left: -50%;
    width: 60%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    filter: blur(4px);
    z-index: -1;
    pointer-events: none;
    transform: translate(6px, 8px);
}

/* Magnifier Lens / Alignment Scope (2x Zoom) */
.magnifier-lens {
    position: absolute;
    top: 0;
    left: 0;
    width: 26px; /* 11.5 mm equivalent */
    height: 26px;
    border-radius: 50%;
    border: 1.5px solid #ef4444; /* High-visibility red scope outer border */
    box-shadow: 
        0 4px 10px rgba(0,0,0,0.5), 
        inset 0 0 8px rgba(0,0,0,0.4);
    z-index: 15; /* Render above carriages & rails */
    overflow: hidden;
    display: none;
    pointer-events: none;
    background-color: #ffffff;
    transition: transform 0.05s linear;
}

.magnifier-lens.active {
    display: block;
}

#magnifier-canvas {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    display: block;
}

.magnifier-crosshair {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* Red cursor scope crosshairs */
.magnifier-crosshair::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 8%;
    right: 8%;
    height: 1px;
    background-color: rgba(239, 68, 68, 0.6);
    transform: translateY(-50%);
}

.magnifier-crosshair::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 8%;
    bottom: 8%;
    width: 1px;
    background-color: rgba(239, 68, 68, 0.6);
    transform: translateX(-50%);
}

/* 6. Console Controls Area */
.plotter-console {
    height: 27%;
    border-top: 5px solid var(--color-console-border);
    background: linear-gradient(180deg, var(--color-chassis-dark) 0%, var(--color-chassis-shadow) 100%);
    display: flex;
    flex-direction: column;
    padding: 1% 2%;
    box-shadow: 
        inset 0 4px 6px rgba(255, 255, 255, 0.25),
        inset 0 -2px 5px rgba(0, 0, 0, 0.4);
    gap: 6px;
    position: relative;
    z-index: 10;
}

/* Pen Stables Row */
.pen-stables-container {
    display: flex;
    align-items: center;
    gap: 16px;
    border-bottom: 2px dashed rgba(0, 0, 0, 0.15);
    padding-bottom: 6px;
    height: 60px; /* Force container height to move divider down */
}

.pen-stables-label {
    font-size: 0.55rem;
    font-weight: 700;
    color: #27272a;
    letter-spacing: 1.5px;
    width: 14%;
    line-height: 1.2;
}

.pen-stables {
    position: relative;
    flex-grow: 1;
    height: 100%;
}

.pen-station {
    position: absolute;
    bottom: -2px; /* Move down slightly to stay within plotter console area */
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    width: 8%;
    transform: translateX(-50%);
}

.pen-station:nth-child(1) { left: 8.75%; }
.pen-station:nth-child(2) { left: 19.75%; }
.pen-station:nth-child(3) { left: 30.75%; }
.pen-station:nth-child(4) { left: 41.75%; }
.pen-station:nth-child(5) { left: 52.75%; }
.pen-station:nth-child(6) { left: 63.75%; }
.pen-station:nth-child(7) { left: 74.75%; }
.pen-station:nth-child(8) { left: 85.75%; }

.pen-slot-hole {
    width: 26px; /* 11.5 mm equivalent */
    height: 26px;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #333333 0%, #111111 75%);
    border: 1.5px solid #666;
    box-shadow: 
        inset 0 2px 4px rgba(0,0,0,0.85),
        0 1px 1px rgba(255,255,255,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
}

.pen-body-in-slot {
    width: 18px; /* 8 mm equivalent */
    height: 18px;
    border-radius: 50%;
    box-shadow: 
        0 1px 2px rgba(0,0,0,0.6),
        inset 0 1px 1px rgba(255,255,255,0.5);
    transition: opacity 0.1s ease;
}

.pen-body-in-slot.empty {
    opacity: 0;
}

/* Buttons Styling */
.btn-console {
    background: linear-gradient(180deg, #f3f4f6 0%, #d1d5db 100%);
    color: #1f2937;
    border: 1.5px solid #6b7280;
    border-radius: 4px;
    font-family: 'Inter', sans-serif;
    font-weight: 700;
    font-size: 0.75rem;
    cursor: pointer;
    box-shadow: 
        0 2px 3px rgba(0,0,0,0.35),
        inset 0 1px 0 rgba(255,255,255,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.05s ease, box-shadow 0.05s ease;
}

.btn-console:active {
    transform: translateY(1.5px);
    box-shadow: 
        0 0.5px 1px rgba(0,0,0,0.3),
        inset 0 1px 3px rgba(0,0,0,0.4);
}

.btn-pen-select {
    width: 22px;
    height: 22px;
    font-size: 0.65rem;
    border-radius: 3px;
}

/* Lower Controls Grid */
.console-lower-controls {
    display: flex;
    flex-grow: 1;
    justify-content: space-between;
    align-items: center;
}

.control-block {
    height: 100%;
    display: flex;
    align-items: center;
}

/* Jog D-Pad */
.jog-block {
    width: 24%;
    justify-content: center;
}

.dpad-container {
    position: relative;
    width: 90px;
    height: 90px;
    background-color: #78756e;
    border-radius: 50%;
    border: 2px solid #333;
    box-shadow: 
        inset 0 2px 4px rgba(0,0,0,0.4),
        0 2px 4px rgba(255,255,255,0.25);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-jog {
    position: absolute;
    width: 26px;
    height: 26px;
    background: linear-gradient(180deg, #e5e7eb 0%, #9ca3af 100%);
    border: 1.5px solid #4b5563;
    border-radius: 4px;
    color: #111827;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 1.5px 2px rgba(0,0,0,0.3);
}

.btn-jog:active {
    background: linear-gradient(180deg, #9ca3af 0%, #6b7280 100%);
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.4);
}

.btn-jog-up { top: 6px; left: 50%; transform: translateX(-50%); }
.btn-jog-down { bottom: 6px; left: 50%; transform: translateX(-50%); }
.btn-jog-left { left: 6px; top: 50%; transform: translateY(-50%); }
.btn-jog-right { right: 6px; top: 50%; transform: translateY(-50%); }

.btn-jog-fast {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: #b91c1c;
    border: 2px solid #7f1d1d;
    color: #fca5a5;
    font-size: 0.45rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 
        0 1px 2px rgba(0,0,0,0.4),
        inset 0 1px 0 rgba(255,255,255,0.2);
}

.btn-jog-fast:active, .btn-jog-fast.active {
    background-color: #7f1d1d;
    box-shadow: inset 0 1.5px 3px rgba(0,0,0,0.6);
    color: #ef4444;
}

/* Operations Blocks */
.operations-block {
    width: 58%;
    display: flex;
    justify-content: space-around;
    align-items: center;
    border-left: 2px solid rgba(0,0,0,0.2);
    border-right: 2px solid rgba(0,0,0,0.2);
    padding: 0 2%;
}

.op-button-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.orange-btn {
    background: linear-gradient(180deg, #ea580c 0%, #c2410c 100%);
    border-color: #9a3412;
    color: #ffedd5;
    width: 48px;
    height: 32px;
    font-size: 0.6rem;
}
.orange-btn:active {
    background: linear-gradient(180deg, #c2410c 0%, #9a3412 100%);
}

.grey-btn {
    width: 42px;
    height: 32px;
    font-size: 0.65rem;
}

.grey-btn.small-text {
    font-size: 0.45rem;
    line-height: 1.1;
}

.btn-subtext {
    font-size: 0.45rem;
    font-weight: 700;
    color: #3f3f46;
    letter-spacing: 1px;
}

.led-indicator-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    min-width: 55px;
}

.led-console {
    width: 12px;
    height: 12px;
}

.orange-led {
    background-color: var(--led-orange-off);
}
.orange-led.active {
    background-color: var(--led-orange-on);
    box-shadow: 0 0 8px var(--led-orange-on), inset 0 1px 1px rgba(255,255,255,0.8);
}

.red-led {
    background-color: var(--led-red-off);
}
.red-led.active {
    background-color: var(--led-red-on);
    box-shadow: 0 0 8px var(--led-red-on), inset 0 1px 1px rgba(255,255,255,0.8);
}

.led-label {
    font-size: 0.45rem;
    font-weight: 700;
    color: #27272a;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

/* Power Block Rocker Switch */
.power-block {
    width: 14%;
    justify-content: center;
}

.power-switch-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.switch-label {
    font-size: 0.5rem;
    font-weight: 800;
    color: #27272a;
    letter-spacing: 1px;
}

.rocker-switch {
    width: 22px;
    height: 42px;
    background-color: #27272a;
    border-radius: 4px;
    border: 2px solid #1a1a1a;
    box-shadow: 
        0 1px 2px rgba(255,255,255,0.35),
        inset 0 2px 4px rgba(0,0,0,0.8);
    position: relative;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    padding: 2px;
}

.rocker-bar {
    width: 100%;
    height: 50%;
    background: linear-gradient(180deg, #f3f4f6 0%, #9ca3af 100%);
    border: 1px solid #4b5563;
    border-radius: 2px;
    box-shadow: 
        0 2px 3px rgba(0,0,0,0.4),
        inset 0 1px 0 #fff;
    transition: transform 0.15s ease-in-out;
}

.rocker-switch.on .rocker-bar {
    transform: translateY(0);
}

.rocker-switch.off .rocker-bar {
    transform: translateY(100%);
    background: linear-gradient(180deg, #9ca3af 0%, #4b5563 100%);
    box-shadow: 
        0 -2px 3px rgba(0,0,0,0.4),
        inset 0 1px 0 rgba(255,255,255,0.2);
}

/* 7. Slide-out Settings Panel Trigger Tab */
.sidebar-tab-trigger {
    position: absolute;
    right: 0;
    background: rgba(30, 29, 27, 0.95);
    border: 1px solid #4c4b45;
    border-right: none;
    border-radius: 8px 0 0 8px;
    color: #e5e7eb;
    padding: 16px 8px;
    cursor: pointer;
    z-index: 100;
    box-shadow: -4px 0 15px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.2s ease;
}

/* Controls tab — slightly below centre */
#sidebar-trigger {
    top: calc(50% + 10px);
    transform: translateY(0);
}

/* Help tab — above Controls tab */
#help-trigger {
    top: calc(50% - 90px);
    transform: translateY(0);
}

.sidebar-tab-trigger:hover {
    background-color: #272522;
    color: #ffffff;
}

.sidebar-tab-trigger.panel-open {
    right: 320px; /* slides with the panel */
}

.tab-label {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 2px;
}

/* 8. Slide-out Sidebar Panel Styling */
.sidebar-panel {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 320px;
    background-color: var(--sidebar-bg);
    border-left: 1px solid var(--sidebar-border);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.85);
    z-index: 99;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(12px);
}

.sidebar-panel.open {
    transform: translateX(0);
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid #2e2c26;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-header h2 {
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: #fff;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-close-sidebar {
    background: none;
    border: none;
    color: #9ca3af;
    font-size: 1.1rem;
    cursor: pointer;
}
.btn-close-sidebar:hover {
    color: #fff;
}

.sidebar-body {
    flex-grow: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Settings Groups & Cards */
.settings-group {
    background-color: rgba(30, 29, 27, 0.4);
    border: 1px solid #2a2924;
    border-radius: 8px;
    padding: 14px;
    transition: padding 0.2s ease;
}

.settings-group.collapsed {
    padding-bottom: 8px;
}

.settings-group.collapsed .settings-group-content {
    display: none;
}

.settings-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: #ea580c;
    letter-spacing: 1px;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
    border-bottom: 1px solid #2a2924;
    padding-bottom: 6px;
    cursor: pointer;
    user-select: none;
    transition: color 0.15s ease;
}

.settings-group.collapsed .settings-title {
    margin-bottom: 0;
    border-bottom: none;
    padding-bottom: 0;
}

.settings-title:hover {
    color: #f97316;
}

.settings-title .toggle-icon {
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.settings-group.collapsed .toggle-icon {
    transform: rotate(-90deg);
}

.section-desc {
    font-size: 0.65rem;
    color: #9ca3af;
    margin-bottom: 8px;
}

.serial-status-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    margin-bottom: 10px;
}

.status-indicator {
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.65rem;
}
.status-indicator.offline { background-color: #7f1d1d; color: #fca5a5; }
.status-indicator.online { background-color: #064e3b; color: #a7f3d0; }
.status-indicator.jogging { background-color: #854d0e; color: #fef08a; }

.unsupported-msg {
    color: #f87171;
    font-size: 0.65rem;
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: 8px;
}

/* Buttons */
.btn {
    width: 100%;
    padding: 8px 14px;
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 0.75rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: background-color 0.15s ease;
}

.btn-primary {
    background-color: #ea580c;
    border: none;
    color: #fff;
}
.btn-primary:hover:not(:disabled) { background-color: #c2410c; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-action {
    background-color: #27272a;
    border: 1px solid #3f3f46;
    color: #e4e4e7;
}
.btn-action:hover {
    background-color: #3f3f46;
    color: #fff;
}

.btn-danger {
    background-color: #7f1d1d;
    border: 1px solid #b91c1c;
    color: #fca5a5;
    margin-top: 4px;
}
.btn-danger:hover {
    background-color: #b91c1c;
    color: #fff;
}

/* Control Items */
.control-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.control-item-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    margin-top: 8px;
}
.control-item-row input[type="checkbox"] {
    cursor: pointer;
}

.control-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: #9ca3af;
    text-transform: uppercase;
}

.setting-select {
    background-color: #18181b;
    border: 1px solid #3f3f46;
    border-radius: 4px;
    color: #e4e4e7;
    padding: 6px;
    font-size: 0.75rem;
    width: 100%;
    cursor: pointer;
}

.setting-range {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #3f3f46;
    outline: none;
}
.setting-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: #ea580c;
    cursor: pointer;
}

.range-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.6rem;
    color: #6b7280;
}

.demo-buttons {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Pen Carousel Configuration Table */
.pen-editor-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.7rem;
}

.pen-editor-table th {
    text-align: left;
    color: #9ca3af;
    font-weight: 600;
    padding: 6px 4px;
    border-bottom: 1px solid #2a2924;
}

.pen-editor-table td {
    padding: 6px 4px;
    vertical-align: middle;
}

.pen-color-preview {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 1px solid #fff;
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0,0,0,0.5);
    transition: transform 0.1s ease;
}
.pen-color-preview:hover {
    transform: scale(1.2);
}

.hidden-color-picker {
    display: none;
}

.width-input {
    width: 50px;
    background-color: #18181b;
    border: 1px solid #3f3f46;
    border-radius: 4px;
    color: #e4e4e7;
    padding: 2px 4px;
    font-size: 0.7rem;
}

/* Live Terminal Log */
.log-container {
    background-color: #0c0a09;
    border: 1px solid #292524;
    border-radius: 6px;
    padding: 8px;
    font-family: 'Fira Code', monospace;
    font-size: 0.6rem;
}

.log-viewport {
    height: 110px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    color: #86efac;
}

.log-empty-msg {
    color: #78716c;
    font-style: italic;
}

.log-line {
    word-break: break-all;
    line-height: 1.3;
}

.log-line.error {
    color: #fca5a5;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--sidebar-border);
    text-align: center;
}

.sidebar-footer p {
    font-size: 0.6rem;
    color: #4b5563;
}

/* 9. Toast Notification System */
.toast-container {
    position: absolute;
    bottom: 20px;
    left: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast-feedback {
    background-color: rgba(24, 24, 27, 0.9);
    border: 1px solid #3f3f46;
    border-radius: 6px;
    color: #fff;
    padding: 10px 16px;
    font-size: 0.75rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    gap: 8px;
    transform: translateY(20px);
    opacity: 0;
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
    backdrop-filter: blur(8px);
}

.toast-feedback.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-feedback i {
    color: #ea580c;
}

/* 10. Left Sidebar Panel & Left Trigger (Debugger) */
.sidebar-panel-left {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 320px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    box-shadow: 10px 0 30px rgba(0, 0, 0, 0.85);
    z-index: 99;
    display: flex;
    flex-direction: column;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(12px);
}

.sidebar-panel-left.open {
    transform: translateX(0);
}

.sidebar-tab-trigger-left {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(30, 29, 27, 0.95);
    border: 1px solid #4c4b45;
    border-left: none;
    border-radius: 0 8px 8px 0;
    color: #e5e7eb;
    padding: 16px 8px;
    cursor: pointer;
    z-index: 100;
    box-shadow: 4px 0 15px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: left 0.3s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.2s ease;
}

.sidebar-tab-trigger-left:hover {
    background-color: #272522;
    color: #ffffff;
}

.sidebar-tab-trigger-left.panel-open {
    left: 320px; /* slides with the panel */
}

/* Debugger Specifics */
.debug-input-container {
    position: relative;
    width: 100%;
}

.debug-textarea {
    width: 100%;
    height: 90px;
    background-color: #0c0a09;
    border: 1px solid #2e2d28;
    border-radius: 6px;
    color: #86efac;
    padding: 8px;
    font-family: 'Fira Code', monospace;
    font-size: 0.65rem;
    resize: none;
    outline: none;
    line-height: 1.3;
    transition: border-color 0.15s ease, background-color 0.15s ease;
}

.debug-textarea.dragover {
    border-color: #22c55e;
    background-color: #052e16;
}

.debug-drag-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none; /* Clicking anywhere focuses the textarea */
    border: 1px dashed rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    background-color: rgba(12, 10, 9, 0.85);
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

/* Allow click interaction on the text action button link only */
.debug-drag-placeholder .btn-select-file-link {
    pointer-events: auto;
    color: #f97316;
    text-decoration: underline;
    cursor: pointer;
    font-weight: 500;
}

.debug-drag-placeholder .btn-select-file-link:hover {
    color: #fdba74;
}

.debug-input-container.has-content .debug-drag-placeholder {
    opacity: 0;
    visibility: hidden;
}

.drag-icon {
    font-size: 1.6rem;
    color: #a1a1aa;
    margin-bottom: 4px;
}

.drag-title {
    font-size: 0.72rem;
    font-weight: 600;
    color: #e4e4e7;
}

.drag-subtitle {
    font-size: 0.58rem;
    color: #71717a;
    margin-top: 2px;
}

.debug-textarea::placeholder {
    color: #57534e;
}

.debug-status-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    margin-bottom: 8px;
}

.debug-item {
    font-family: 'Fira Code', monospace;
    font-size: 0.62rem;
    display: flex;
    align-items: flex-start;
    gap: 6px;
    padding: 6px 4px;
    color: #d4d4d8;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
    cursor: pointer;
    line-height: 1.3;
}

.debug-item:hover {
    background-color: rgba(255, 255, 255, 0.03);
}

.debug-item i {
    margin-top: 1.5px;
    font-size: 0.65rem;
}

.debug-item.pending i {
    color: #52525b;
}

.debug-item.active {
    color: #ffffff;
    background-color: rgba(234, 88, 12, 0.2);
    font-weight: 600;
    animation: debug-active-pulse 1.8s infinite;
}

.debug-item.active i {
    color: #ea580c;
}

.debug-item.done {
    color: #71717a;
}

.debug-item.done i {
    color: #10b981;
}

@keyframes debug-active-pulse {
    0% { background-color: rgba(234, 88, 12, 0.15); }
    50% { background-color: rgba(234, 88, 12, 0.3); }
    100% { background-color: rgba(234, 88, 12, 0.15); }
}

/* Debug Carriage Status Card Styling */
.debug-status-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
    font-size: 0.75rem;
    font-family: 'Fira Code', monospace;
}

.debug-status-row .status-label {
    color: #9ca3af;
}

.debug-status-row .status-value {
    color: #f97316;
    font-weight: 600;
}

.debug-scope-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 12px;
    gap: 6px;
}

.debug-scope-lens {
    position: relative;
    width: 70px;
    height: 70px;
    border-radius: 50%;
    border: 2px solid #ef4444; /* High visibility red border */
    box-shadow: 
        0 4px 8px rgba(0,0,0,0.6),
        inset 0 0 10px rgba(0,0,0,0.5);
    overflow: hidden;
    background-color: #ffffff;
}

#debug-magnifier-canvas {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    display: block;
}

.debug-scope-crosshair {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.debug-scope-crosshair::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 4px;
    right: 4px;
    height: 1px;
    background-color: rgba(239, 68, 68, 0.6);
    transform: translateY(-50%);
}

.debug-scope-crosshair::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 4px;
    bottom: 4px;
    width: 1px;
    background-color: rgba(239, 68, 68, 0.6);
    transform: translateX(-50%);
}

.scope-caption {
    font-size: 0.6rem;
    color: #9ca3af;
    letter-spacing: 0.5px;
}


/* ============================================================
   Help Panel Specific Styles
   ============================================================ */

/* Sidebar body base text */
#help-panel .sidebar-body {
    font-size: 0.78rem;
    color: #d1d5db;
    line-height: 1.6;
}

#help-panel p {
    margin: 0 0 8px;
}

#help-panel ul, #help-panel ol {
    margin: 4px 0 8px 16px;
    padding: 0;
}

#help-panel li {
    margin-bottom: 4px;
}

/* Contents / Index anchor links */
.help-contents-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.help-contents-list a {
    display: flex;
    align-items: center;
    gap: 6px;
    color: #ea580c;
    text-decoration: none;
    font-size: 0.76rem;
    font-weight: 600;
    padding: 5px 8px;
    border-radius: 5px;
    transition: background 0.15s, color 0.15s;
}

.help-contents-list a:hover {
    background: rgba(234, 88, 12, 0.12);
    color: #f97316;
}

.help-contents-list .toc-section {
    color: #6b7280;
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    padding: 8px 8px 2px;
}

/* Index grid */
.help-index-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3px 8px;
}

.help-index-grid a {
    color: #ea580c;
    text-decoration: none;
    font-size: 0.72rem;
    padding: 2px 0;
    border-bottom: 1px dashed #2a2924;
    transition: color 0.15s;
}

.help-index-grid a:hover {
    color: #f97316;
}

/* Technical "deep-dive" card */
.tech-card {
    background: rgba(15, 14, 12, 0.7);
    border: 1px solid #3b3a32;
    border-left: 3px solid #6366f1;
    border-radius: 6px;
    padding: 10px 12px;
    margin: 8px 0;
    font-size: 0.73rem;
}

.tech-card-title {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: #818cf8;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.tech-card code {
    background: rgba(99, 102, 241, 0.15);
    color: #a5b4fc;
    padding: 1px 4px;
    border-radius: 3px;
    font-size: 0.72rem;
}

/* General inline code */
#help-panel code {
    background: rgba(255,255,255,0.06);
    color: #93c5fd;
    padding: 1px 5px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.72rem;
}

/* Tip / note callout */
.help-callout {
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.25);
    border-left: 3px solid #10b981;
    border-radius: 6px;
    padding: 8px 12px;
    margin: 8px 0;
    font-size: 0.73rem;
    color: #a7f3d0;
}

.help-callout.warn {
    background: rgba(245, 158, 11, 0.08);
    border-color: rgba(245, 158, 11, 0.25);
    border-left-color: #f59e0b;
    color: #fde68a;
}

.help-callout-title {
    font-weight: 700;
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

/* HPGL command table */
.hpgl-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.72rem;
    margin: 4px 0;
}

.hpgl-table thead th {
    background: rgba(234, 88, 12, 0.15);
    color: #ea580c;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.65rem;
    letter-spacing: 1px;
    padding: 6px 8px;
    text-align: left;
    border-bottom: 1px solid #3b3a32;
}

.hpgl-table tbody tr {
    border-bottom: 1px solid #1f1e1b;
    transition: background 0.1s;
}

.hpgl-table tbody tr:hover {
    background: rgba(255,255,255,0.03);
}

.hpgl-table td {
    padding: 5px 8px;
    vertical-align: top;
}

.hpgl-table td:first-child {
    font-family: 'Courier New', monospace;
    font-weight: 700;
    color: #93c5fd;
    white-space: nowrap;
    width: 52px;
}

.hpgl-table td:nth-child(2) {
    color: #f97316;
    font-weight: 600;
    width: 100px;
}

.hpgl-table td:last-child {
    color: #9ca3af;
}

/* Level badges */
.cmd-badge {
    display: inline-block;
    font-size: 0.58rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    padding: 1px 5px;
    border-radius: 3px;
    vertical-align: middle;
    margin-left: 4px;
}

.cmd-badge.gl2 {
    background: rgba(99, 102, 241, 0.2);
    color: #818cf8;
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.cmd-badge.classic {
    background: rgba(234, 88, 12, 0.15);
    color: #fb923c;
    border: 1px solid rgba(234, 88, 12, 0.25);
}

/* Feature chip row */
.feature-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin: 6px 0;
}

.feature-chip {
    background: rgba(255,255,255,0.05);
    border: 1px solid #3b3a32;
    border-radius: 20px;
    padding: 3px 10px;
    font-size: 0.67rem;
    color: #d1d5db;
}