:root {
            --bg-color: #12151a;
            --container-bg: #1a1f27;
            --panel-bg: #212833;
            --border-color: #2c3542;
            --panel-sunken: rgba(0, 0, 0, 0.3);
            --text-primary: #e7ebf0;
            --text-secondary: #93a1b3;
            --accent-orange: #f97316;
            --accent-cyan: #38bdf8;
            --accent-red: #ef4444;
            --accent-green: #22c55e;
            --display-font: 'Michroma', sans-serif;
            --body-font: 'Titillium Web', sans-serif;
            --shadow-color: rgba(0, 0, 0, 0.6);

            /* Shared kit mapping */
            --kit-accent: var(--accent-orange);
            --kit-accent-ink: #1c0f02;
            --kit-accent-glow: rgba(249, 115, 22, 0.25);
            --kit-surface: var(--panel-bg);
            --kit-border: var(--border-color);
            --kit-input-bg: var(--container-bg);
            --kit-error: var(--accent-red);

            /* Ratio dial + meshed-gear rig (dark) */
            --dial-face-bg: #0b0f14;
            --canvas-bg: #0a0d12;
            --gear-metal: #4b5563;
            --gear-metal-driven: #64748b;
        }

        body.light-mode {
            --bg-color: #f5f4ef;
            --container-bg: #ffffff;
            --panel-bg: #f2f0e8;
            --border-color: #d9d4c8;
            --panel-sunken: rgba(0, 0, 0, 0.05);
            --text-primary: #201a10;
            --text-secondary: #5c5647;
            --accent-orange: #c2410c;
            --accent-cyan: #0369a1;
            --accent-red: #b91c1c;
            --accent-green: #15803d;
            --shadow-color: rgba(0, 0, 0, 0.1);

            /* Shared kit mapping (light theme) */
            --kit-accent: var(--accent-orange);
            --kit-accent-ink: #fff7f0;
            --kit-accent-glow: rgba(194, 65, 12, 0.18);
            --kit-surface: var(--panel-bg);
            --kit-border: var(--border-color);
            --kit-input-bg: var(--container-bg);
            --kit-error: var(--accent-red);

            /* Ratio dial + meshed-gear rig (light) */
            --dial-face-bg: #e7e2d3;
            --canvas-bg: #efece1;
            --gear-metal: #7c8797;
            --gear-metal-driven: #9aa6b5;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-primary);
            font-family: var(--body-font);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .top-controls {
            position: fixed;
            top: 20px;
            right: 24px;
            z-index: 1000;
        }

        .theme-toggle-btn {
            background: var(--container-bg);
            color: var(--text-primary);
            border: 2px solid var(--border-color);
            padding: 8px 16px;
            border-radius: 8px;
            font-family: var(--body-font);
            font-weight: 700;
            font-size: 0.85rem;
            cursor: pointer;
            box-shadow: 0 4px 10px var(--shadow-color);
        }

        .theme-toggle-btn:hover {
            border-color: var(--accent-orange);
        }

        .workshop-container {
            width: 100%;
            max-width: 900px;
            background: var(--container-bg);
            border: 2px solid var(--border-color);
            border-top: 6px solid var(--accent-orange);
            border-radius: 10px;
            padding: 32px;
            box-shadow: 0 12px 30px var(--shadow-color);
            min-height: 600px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .hero-icon {
            font-size: 3.2rem;
            margin-bottom: 8px;
        }

        .workshop-title {
            font-family: var(--display-font);
            font-size: 1.7rem;
            color: var(--accent-orange);
            text-align: center;
            letter-spacing: 1px;
            margin-bottom: 8px;
        }

        .workshop-subtitle {
            font-family: var(--body-font);
            font-weight: 600;
            text-align: center;
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .screen-center {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 10px 0;
        }

        .brief-box {
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 20px 28px;
            text-align: left;
            margin: 16px 0;
            max-width: 680px;
            line-height: 1.7;
            font-size: 0.95rem;
        }

        .brief-box ul { padding-left: 20px; }
        .brief-box li { margin-bottom: 8px; }

        .action-btn {
            background: var(--accent-orange);
            color: #fff7f0;
            border: none;
            padding: 14px 36px;
            font-family: var(--display-font);
            font-size: 0.9rem;
            font-weight: 700;
            letter-spacing: 1px;
            cursor: pointer;
            margin-top: 18px;
            border-radius: 8px;
            box-shadow: 0 4px 12px var(--shadow-color);
        }

        .action-btn:hover { opacity: 0.92; }

        /* HUD Bar */
        .hud-bar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            padding: 12px 20px;
            margin-bottom: 18px;
            border-radius: 8px;
            gap: 12px;
            flex-wrap: wrap;
        }

        .hud-item {
            display: flex;
            flex-direction: column;
        }

        .hud-label {
            font-size: 0.72rem;
            color: var(--text-secondary);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .hud-value {
            font-family: var(--display-font);
            font-size: 1rem;
            color: var(--accent-cyan);
        }

        .power-container {
            width: 160px;
            height: 12px;
            background: var(--border-color);
            border-radius: 6px;
            overflow: hidden;
            margin-top: 4px;
        }

        .power-fill {
            height: 100%;
            width: 100%;
            background: var(--accent-green);
            transition: width 0.3s ease, background-color 0.3s ease;
        }

        /* Rover Track */
        .rover-track {
            position: relative;
            height: 64px;
            background: var(--panel-sunken);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 18px;
            overflow: hidden;
        }

        .track-terrain {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 14px;
            background: repeating-linear-gradient(
                90deg,
                var(--border-color),
                var(--border-color) 10px,
                transparent 10px,
                transparent 20px
            );
        }

        .rover-icon {
            position: absolute;
            bottom: 12px;
            left: 8px;
            font-size: 1.8rem;
            transition: left 0.6s ease;
        }

        @keyframes roverHop {
            0% { transform: translateY(0) rotate(0deg); }
            30% { transform: translateY(-16px) rotate(-10deg); }
            55% { transform: translateY(-2px) rotate(6deg); }
            100% { transform: translateY(0) rotate(0deg); }
        }

        @keyframes roverStumble {
            0%, 100% { transform: translateX(0) rotate(0deg); }
            20% { transform: translateX(-5px) rotate(-8deg); }
            40% { transform: translateX(4px) rotate(7deg); }
            60% { transform: translateX(-4px) rotate(-6deg); }
            80% { transform: translateX(3px) rotate(4deg); }
        }

        .rover-icon.hop { animation: roverHop 0.65s ease; }
        .rover-icon.stumble { animation: roverStumble 0.65s ease; }

        .track-goal {
            position: absolute;
            bottom: 8px;
            right: 10px;
            font-size: 1.5rem;
        }

        /* Mission Prompt */
        .mission-box {
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            border-left: 4px solid var(--accent-orange);
            border-radius: 8px;
            padding: 18px 22px;
            margin-bottom: 18px;
        }

        .mission-tag {
            font-family: var(--display-font);
            font-size: 0.7rem;
            text-transform: uppercase;
            color: var(--accent-orange);
            margin-bottom: 8px;
            letter-spacing: 1px;
        }

        .mission-text {
            font-size: 1.08rem;
            line-height: 1.55;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .target-readout {
            font-family: var(--display-font);
            font-size: 0.85rem;
            color: var(--accent-cyan);
        }

        .tolerance-note {
            font-family: var(--body-font);
            font-size: 0.78rem;
            color: var(--text-secondary);
            margin-left: 6px;
        }

        /* Interlocking Gear Dial Panel */
        .gear-panel {
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 18px 22px;
        }

        .dial-mech-row {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            align-items: flex-start;
            justify-content: center;
            margin-bottom: 16px;
        }

        .dial-column {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
            flex: 1 1 220px;
        }

        .dial-label {
            font-family: var(--display-font);
            font-size: 0.68rem;
            text-align: center;
            color: var(--text-secondary);
            letter-spacing: 0.5px;
        }

        .ratio-dial {
            width: 170px;
            height: 170px;
            touch-action: none;
            cursor: grab;
            outline: none;
            -webkit-tap-highlight-color: transparent;
        }

        .ratio-dial.dragging {
            cursor: grabbing;
        }

        .dial-face {
            position: relative;
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background: var(--dial-face-bg);
            border: 4px solid var(--border-color);
            box-shadow: inset 0 4px 12px var(--shadow-color);
        }

        .ratio-dial:focus-visible .dial-face {
            box-shadow: inset 0 4px 12px var(--shadow-color), 0 0 0 3px var(--accent-cyan);
        }

        .dial-needle {
            position: absolute;
            left: 50%;
            top: 50%;
            width: 5px;
            height: 42%;
            background: var(--accent-red);
            border-radius: 3px;
            transform-origin: 50% 100%;
            transform: translate(-50%, -100%) rotate(-135deg);
            box-shadow: 0 0 6px var(--accent-red);
        }

        .dial-hub {
            position: absolute;
            left: 50%;
            top: 50%;
            width: 34px;
            height: 34px;
            margin: -17px 0 0 -17px;
            border-radius: 50%;
            background: var(--panel-bg);
            border: 2px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.05rem;
            pointer-events: none;
        }

        .dial-tick {
            position: absolute;
            bottom: 10px;
            font-size: 0.6rem;
            font-weight: 700;
            color: var(--text-secondary);
            letter-spacing: 0.5px;
            pointer-events: none;
        }

        .dial-tick-min { left: 10px; }
        .dial-tick-max { right: 10px; }

        .gear-column {
            flex: 1 1 260px;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
        }

        .gear-svg {
            width: 100%;
            max-width: 280px;
            background: var(--canvas-bg);
            border: 1px solid var(--border-color);
            border-radius: 8px;
        }

        .gear-fill-driver {
            fill: var(--gear-metal);
            stroke: var(--border-color);
            stroke-width: 1;
        }

        .gear-fill-driven {
            fill: var(--gear-metal-driven);
            stroke: var(--border-color);
            stroke-width: 1;
        }

        .gear-hole {
            fill: var(--canvas-bg);
        }

        .gear-bolt {
            fill: var(--text-secondary);
        }

        .gear-caption {
            font-size: 0.78rem;
            color: var(--text-secondary);
            text-align: center;
        }

        .live-readout {
            font-family: var(--display-font);
            font-size: 0.95rem;
            color: var(--text-primary);
            margin: 4px 0 14px;
            text-align: center;
        }

        #achievedReadout {
            color: var(--accent-cyan);
        }

        .match-badge {
            margin-left: 8px;
            font-size: 0.8rem;
            font-weight: 700;
            font-family: var(--body-font);
            padding: 2px 8px;
            border-radius: 6px;
            background: var(--panel-sunken);
        }

        .match-good { color: var(--accent-green); }
        .match-warm { color: var(--accent-orange); }
        .match-bad { color: var(--accent-red); }

        .fire-btn {
            background: var(--accent-orange);
            color: #fff7f0;
            border: none;
            padding: 14px;
            font-family: var(--display-font);
            font-size: 0.9rem;
            font-weight: 700;
            letter-spacing: 1px;
            cursor: pointer;
            border-radius: 8px;
            width: 100%;
            box-shadow: 0 4px 14px var(--shadow-color);
        }

        .fire-btn:hover {
            opacity: 0.92;
        }

        .fire-btn:disabled {
            opacity: 0.55;
            cursor: default;
        }

        .feedback-line {
            font-family: var(--body-font);
            text-align: center;
            font-size: 1rem;
            font-weight: 700;
            min-height: 24px;
            margin-top: 10px;
        }

        .text-success { color: var(--accent-green); }
        .text-error { color: var(--accent-red); }

        .score-readout {
            font-family: var(--display-font);
            font-size: 1.1rem;
            background: var(--panel-bg);
            padding: 10px 22px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 12px;
            color: var(--accent-orange);
        }

        footer {
            margin-top: 20px;
            font-family: var(--body-font);
            font-size: 0.8rem;
            color: var(--text-secondary);
            text-align: center;
        }

        @media (max-width: 640px) {
            .hud-bar { flex-direction: column; align-items: flex-start; }
        }