:root {
            --bg-color: #121418;
            --container-bg: #1a1e24;
            --border-color: #2e3540;
            --text-primary: #e2e8f0;
            --text-secondary: #94a3b8;
            --accent-amber: #d97706;
            --accent-red: #dc2626;
            --accent-green: #16a34a;
            --card-bg: #222730;
            --typewriter-font: 'Special Elite', cursive, monospace;
            --code-font: 'Courier Prime', monospace;
            --sans-font: 'Inter', sans-serif;
            --shadow-color: rgba(0, 0, 0, 0.5);

            /* Shared kit mapping */
            --kit-accent: var(--accent-amber);
            --kit-accent-ink: #1c1400;
            --kit-accent-glow: rgba(217, 119, 6, 0.25);
            --kit-surface: var(--card-bg);
            --kit-border: var(--border-color);
            --kit-input-bg: var(--container-bg);
            --kit-error: var(--accent-red);

            /* Corkboard panel — redeclared (not chained) in the light block too,
               see body.light-mode comment below for why. */
            --board-bg: var(--card-bg);
            --board-dot: var(--border-color);
        }

        body.light-mode {
            --bg-color: #f1f5f9;
            --container-bg: #ffffff;
            --border-color: #cbd5e1;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --accent-amber: #b45309;
            --accent-red: #b91c1c;
            --accent-green: #15803d;
            --card-bg: #f8fafc;
            --shadow-color: rgba(0, 0, 0, 0.1);

            /* Shared kit mapping (redeclared here — see dark-block comment) */
            --kit-accent: var(--accent-amber);
            --kit-accent-ink: #ffffff;
            --kit-accent-glow: rgba(180, 83, 9, 0.2);
            --kit-surface: var(--card-bg);
            --kit-border: var(--border-color);
            --kit-input-bg: var(--container-bg);
            --kit-error: var(--accent-red);

            /* Corkboard panel — redeclared explicitly here, not inherited via
               var-of-var, so the light theme actually re-tracks it. */
            --board-bg: var(--card-bg);
            --board-dot: var(--border-color);
        }

        * {
            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(--sans-font);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        /* Top Right Theme Toggle Switch */
        .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: 4px;
            font-family: var(--code-font);
            font-weight: 700;
            font-size: 0.85rem;
            cursor: pointer;
            box-shadow: 0 4px 10px var(--shadow-color);
            letter-spacing: 0.5px;
        }

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

        /* Main Folder/Board Container */
        .dossier-container {
            width: 100%;
            max-width: 840px;
            background: var(--container-bg);
            border: 2px solid var(--border-color);
            border-top: 6px solid var(--accent-amber);
            border-radius: 4px;
            padding: 36px;
            box-shadow: 0 12px 30px var(--shadow-color);
            min-height: 560px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            position: relative;
        }

        /* Header Styling */
        .case-title {
            font-family: var(--typewriter-font);
            font-size: 2.1rem;
            color: var(--accent-amber);
            text-align: center;
            letter-spacing: 1px;
            margin-bottom: 6px;
            text-transform: uppercase;
        }

        .case-subtitle {
            font-family: var(--code-font);
            text-align: center;
            color: var(--text-secondary);
            font-size: 0.95rem;
            margin-bottom: 24px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        /* HUD Status Bar */
        .status-bar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 12px 20px;
            margin-bottom: 16px;
            font-family: var(--code-font);
            flex-wrap: wrap;
            gap: 8px;
        }

        .status-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            font-weight: 700;
        }

        .status-label {
            color: var(--text-secondary);
        }

        .status-value {
            color: var(--accent-amber);
        }

        /* Flavor narration line above the corkboard */
        .narration-line {
            font-family: var(--typewriter-font);
            font-size: 0.95rem;
            color: var(--text-secondary);
            text-align: center;
            font-style: italic;
            margin-bottom: 16px;
            line-height: 1.5;
        }

        /* ============ CORKBOARD ============ */

        .corkboard-wrap {
            position: relative;
            background-color: var(--board-bg);
            background-image: radial-gradient(var(--board-dot) 1.4px, transparent 1.6px);
            background-size: 18px 18px;
            border: 2px dashed var(--border-color);
            border-radius: 6px;
            padding: 20px;
            margin-bottom: 16px;
        }

        .string-svg {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
            overflow: visible;
            pointer-events: none;
        }

        .drag-line {
            stroke: var(--accent-red);
            stroke-width: 3;
            stroke-linecap: round;
        }

        .pinned-string {
            stroke: var(--accent-red);
            stroke-width: 3;
            stroke-linecap: round;
        }

        .pinned-string.solved {
            filter: drop-shadow(0 2px 1px var(--shadow-color));
        }

        .pinned-string.snapped {
            transform-box: fill-box;
            transform-origin: center;
            animation: snapFall 0.7s ease forwards;
        }

        @keyframes snapFall {
            0% { transform: translateY(0) rotate(0deg); opacity: 0.95; }
            100% { transform: translateY(46px) rotate(10deg); opacity: 0; }
        }

        /* Clue file — the draggable case card */
        .clue-card {
            position: relative;
            z-index: 2;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-left: 4px solid var(--accent-amber);
            padding: 22px 24px 30px;
            cursor: grab;
            touch-action: none;
            user-select: none;
            box-shadow: 0 6px 14px var(--shadow-color);
        }

        .clue-card.dragging {
            cursor: grabbing;
            box-shadow: 0 0 0 3px var(--accent-amber), 0 10px 22px var(--shadow-color);
        }

        .clue-card.pinned {
            opacity: 0.82;
            cursor: default;
        }

        .evidence-tag {
            font-family: var(--code-font);
            font-size: 0.75rem;
            text-transform: uppercase;
            color: var(--accent-amber);
            font-weight: 700;
            margin-bottom: 10px;
            letter-spacing: 1px;
        }

        .evidence-text {
            font-size: 1.15rem;
            line-height: 1.6;
            font-weight: 500;
        }

        .clue-drag-hint {
            margin-top: 14px;
            font-family: var(--code-font);
            font-size: 0.78rem;
            color: var(--text-secondary);
            letter-spacing: 0.3px;
        }

        .clue-pin {
            position: absolute;
            left: 50%;
            bottom: -18px;
            transform: translateX(-50%);
            font-size: 1.7rem;
            line-height: 1;
            filter: drop-shadow(0 3px 2px var(--shadow-color));
            pointer-events: none;
        }

        /* Leads layer — the scattered suspect/answer cards */
        .leads-layer {
            position: relative;
            width: 100%;
            height: 300px;
            margin-top: 34px;
            z-index: 2;
        }

        .corkboard-wrap.drag-active .lead-card {
            outline: 2px dashed var(--accent-amber);
            outline-offset: 2px;
        }

        .lead-card {
            position: absolute;
            width: 44%;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 2px;
            padding: 14px 16px 16px;
            box-shadow: 0 5px 12px var(--shadow-color);
            transform: rotate(var(--rot, 0deg));
        }

        .lead-card.disabled {
            pointer-events: none;
        }

        .lead-card.correct {
            border-color: var(--accent-green) !important;
            background: rgba(22, 163, 74, 0.15);
        }

        .lead-card.wrong {
            border-color: var(--accent-red) !important;
            background: rgba(220, 38, 38, 0.15);
            animation: shake 0.45s ease;
        }

        .lead-card.thunk {
            animation: thunk 0.4s ease;
        }

        @keyframes thunk {
            0% { transform: scale(1) rotate(var(--rot, 0deg)); }
            45% { transform: scale(1.14) rotate(var(--rot, 0deg)); }
            100% { transform: scale(1) rotate(var(--rot, 0deg)); }
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0) rotate(var(--rot, 0deg)); }
            20% { transform: translateX(-7px) rotate(var(--rot, 0deg)); }
            40% { transform: translateX(7px) rotate(var(--rot, 0deg)); }
            60% { transform: translateX(-5px) rotate(var(--rot, 0deg)); }
            80% { transform: translateX(5px) rotate(var(--rot, 0deg)); }
        }

        .lead-pin {
            display: block;
            font-size: 1.1rem;
            margin-bottom: 4px;
        }

        .lead-label {
            display: block;
            font-family: var(--code-font);
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 0.8px;
            color: var(--text-secondary);
            font-weight: 700;
            margin-bottom: 6px;
        }

        .lead-text {
            display: block;
            font-size: 1rem;
            font-weight: 600;
            line-height: 1.4;
        }

        @media (max-width: 640px) {
            .leads-layer {
                height: auto;
            }
            .lead-card {
                position: static !important;
                left: auto !important;
                top: auto !important;
                width: 100% !important;
                transform: none !important;
                margin-bottom: 12px;
            }
            .lead-card:last-child {
                margin-bottom: 0;
            }
            .string-svg {
                display: none;
            }
        }

        /* Feedback Message */
        .feedback-line {
            font-family: var(--code-font);
            text-align: center;
            font-size: 1rem;
            font-weight: 700;
            min-height: 24px;
            text-transform: uppercase;
        }

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

        /* General Screen Centering Layout */
        .screen-center {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 10px 0;
        }

        .action-btn {
            background: var(--accent-amber);
            color: #ffffff;
            border: none;
            padding: 14px 36px;
            font-family: var(--code-font);
            font-size: 1rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            cursor: pointer;
            margin-top: 20px;
            box-shadow: 0 4px 12px var(--shadow-color);
        }

        .action-btn:hover {
            opacity: 0.9;
        }

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

        .dossier-box ul {
            padding-left: 20px;
        }

        .dossier-box li {
            margin-bottom: 8px;
        }

        /* Proof of Progress Alert Box */
        .disclaimer-box {
            background: rgba(217, 119, 6, 0.08);
            border: 2px dashed var(--accent-amber);
            padding: 20px 24px;
            margin: 20px 0;
            text-align: center;
            max-width: 680px;
        }

        .disclaimer-box h3 {
            font-family: var(--typewriter-font);
            color: var(--accent-amber);
            font-size: 1.2rem;
            margin-bottom: 8px;
            text-transform: uppercase;
        }

        .disclaimer-box p {
            font-size: 0.95rem;
            line-weight: 1.5;
            color: var(--text-primary);
        }

        footer {
            margin-top: 24px;
            font-family: var(--code-font);
            font-size: 0.8rem;
            color: var(--text-secondary);
            text-align: center;
            letter-spacing: 0.5px;
        }