/* ============================================================
           Generic Agent AI Water Pump Automation — Futuristic White Lofi
           ============================================================ */

        :root {
            --bg-root: #FAFAF8;
            --bg-surface: #FFFFFF;
            --bg-glass: rgba(255, 255, 255, 0.72);
            --bg-glass-strong: rgba(255, 255, 255, 0.88);
            --bg-muted: #F4F3F0;
            --lofi-lavender: #C4B5E8;
            --lofi-sage: #A8C5B5;
            --lofi-peach: #F5D0C5;
            --lofi-dusty-blue: #9BB5CE;
            --lofi-mauve: #B8A9C9;
            --lofi-blush: #E8D5E0;
            --accent: #7B9FD4;
            --accent-deep: #5A7FAD;
            --text-primary: #1A1A1E;
            --text-secondary: #5C5C66;
            --text-muted: #8E8E93;
            --border: rgba(0, 0, 0, 0.06);
            --border-medium: rgba(0, 0, 0, 0.1);
            --shadow-soft: 0 4px 24px rgba(26, 26, 30, 0.04);
            --shadow-glass: 0 8px 32px rgba(155, 181, 206, 0.12);
            --radius-sm: 10px;
            --radius-md: 16px;
            --radius-lg: 22px;
            --radius-xl: 28px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --font-mono: 'JetBrains Mono', 'IBM Plex Mono', 'SF Mono', monospace;
            --gradient-progress: linear-gradient(90deg, var(--lofi-lavender), var(--lofi-dusty-blue));
            --gradient-hero: radial-gradient(ellipse 70% 50% at 15% 20%, rgba(196, 181, 232, 0.18) 0%, transparent 55%),
                             radial-gradient(ellipse 60% 45% at 85% 75%, rgba(155, 181, 206, 0.14) 0%, transparent 55%),
                             radial-gradient(ellipse 50% 40% at 50% 50%, rgba(168, 197, 181, 0.08) 0%, transparent 60%);
            --water-color: #7B9FD4;
            --pump-active: #A8C5B5;
            --sensor-active: #F5D0C5;
        }

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

        html { scroll-behavior: smooth; }

        body {
            font-family: var(--font-sans);
            background: var(--bg-root);
            color: var(--text-primary);
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            line-height: 1.5;
        }

        ::selection {
            background: rgba(168, 197, 181, 0.35);
            color: var(--text-primary);
        }

        /* ===== BACKGROUND GRID ===== */
        .df-grid-bg {
            position: fixed;
            inset: 0;
            pointer-events: none;
            z-index: 0;
            background: var(--gradient-hero);
        }

        .df-grid-bg::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image:
                linear-gradient(rgba(155, 181, 206, 0.07) 1px, transparent 1px),
                linear-gradient(90deg, rgba(155, 181, 206, 0.07) 1px, transparent 1px);
            background-size: 48px 48px;
            mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 20%, transparent 75%);
        }

        .df-shell {
            position: relative;
            z-index: 1;
            max-width: 1180px;
            margin: 0 auto;
            padding: 28px 20px 60px;
        }

        /* ===== HEADER ===== */
        .df-header {
            text-align: center;
            margin-bottom: 32px;
        }

        .df-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-family: var(--font-mono);
            font-size: 11px;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--text-muted);
            margin-bottom: 12px;
        }

        .pulse-dot {
            display: inline-block;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--lofi-sage);
            box-shadow: 0 0 8px rgba(168, 197, 181, 0.8);
            animation: pulseDot 2.4s ease-in-out infinite;
        }

        @keyframes pulseDot {
            0%, 100% { opacity: 0.5; transform: scale(1); }
            50% { opacity: 1; transform: scale(1.3); }
        }

        .df-header h1 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 12px;
            background: linear-gradient(90deg, var(--text-primary), var(--accent-deep));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 20px;
        }

        .badges {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 20px;
        }

        .badge {
            font-family: var(--font-mono);
            font-size: 11px;
            padding: 4px 12px;
            border-radius: 99px;
            background: var(--bg-glass-strong);
            border: 1px solid var(--border);
            backdrop-filter: blur(12px);
        }

        /* ===== CONTROLS ===== */
        .controls {
            display: flex;
            justify-content: center;
            gap: 12px;
            margin-bottom: 12px;
            flex-wrap: wrap;
        }

        .speed-control {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            margin-bottom: 20px;
            padding: 10px 18px;
            background: var(--bg-glass-strong);
            border: 1px solid var(--border);
            border-radius: 999px;
            flex-wrap: wrap;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }

        .speed-control label {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-secondary);
            white-space: nowrap;
        }

        .speed-control input[type="range"] {
            flex: 1;
            min-width: 140px;
            max-width: 220px;
            accent-color: var(--lofi-lavender);
            cursor: pointer;
        }

        .speed-label {
            font-family: var(--font-mono);
            font-size: 13px;
            font-weight: 700;
            color: var(--text-primary);
            min-width: 42px;
            text-align: right;
        }

        .speed-hint {
            width: 100%;
            text-align: center;
            font-size: 11px;
            color: var(--text-muted);
        }

        .btn {
            font-family: var(--font-sans);
            background: var(--text-primary);
            color: #fff;
            border: none;
            padding: 11px 22px;
            border-radius: 999px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
        }

        .btn:hover:not(:disabled) {
            transform: translateY(-1px);
            box-shadow: var(--shadow-soft);
        }

        .btn:disabled {
            opacity: 0.38;
            cursor: not-allowed;
        }

        .btn.stop {
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-medium);
        }

        .btn.stop:hover:not(:disabled) {
            background: rgba(245, 208, 197, 0.35);
            border-color: var(--lofi-peach);
        }

        .btn.secondary {
            background: var(--bg-glass-strong);
            color: var(--text-primary);
            border: 1px solid var(--border);
            backdrop-filter: blur(12px);
        }

        .btn.secondary:hover:not(:disabled) {
            border-color: var(--lofi-lavender);
            box-shadow: var(--shadow-glass);
        }

        .btn-ghost {
            padding: 7px 14px;
            font-size: 13px;
        }

        /* ===== PROGRESS ===== */
        .progress-wrap {
            margin-bottom: 20px;
        }

        .progress {
            width: 100%;
            height: 4px;
            background: rgba(155, 181, 206, 0.2);
            border-radius: 99px;
            overflow: hidden;
        }

        .progress-bar {
            height: 100%;
            background: var(--gradient-progress);
            width: 0%;
            transition: width 0.45s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
        }

        .progress-bar::after {
            content: '';
            position: absolute;
            right: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: #fff;
            box-shadow: 0 0 10px var(--lofi-lavender);
        }

        .progress-label {
            display: flex;
            justify-content: space-between;
            font-family: var(--font-mono);
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 8px;
        }

        /* ===== STEPPER ===== */
        #stageNav {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 0;
            margin-bottom: 24px;
            flex-wrap: wrap;
            padding: 12px 16px;
            background: var(--bg-glass);
            backdrop-filter: blur(20px);
            border: 1px solid var(--border);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-soft);
        }

        .stage-btn {
            position: relative;
            background: transparent !important;
            color: var(--text-muted) !important;
            border: none !important;
            padding: 8px 6px !important;
            font-size: 0 !important;
            margin: 0 !important;
            min-width: 32px;
            height: 32px;
            border-radius: 50% !important;
            box-shadow: none !important;
            transform: none !important;
        }

        .stage-btn::before {
            content: attr(data-step);
            font-family: var(--font-mono);
            font-size: 10px;
            font-weight: 600;
            color: var(--text-muted);
        }

        .stage-btn::after {
            content: '';
            position: absolute;
            top: 50%;
            left: calc(100% - 2px);
            width: 20px;
            height: 1px;
            background: var(--border-medium);
            transform: translateY(-50%);
        }

        .stage-btn:last-child::after { display: none; }

        .stage-btn:hover:not(.active) {
            background: rgba(168, 197, 181, 0.2) !important;
        }

        .stage-btn.active {
            background: var(--lofi-lavender) !important;
            box-shadow: 0 0 0 3px rgba(196, 181, 232, 0.35), var(--shadow-glass) !important;
            transform: scale(1.08) !important;
        }

        .stage-btn.active::before { color: var(--text-primary); }

        .wa-typing {
            display: none;
            align-items: center;
            gap: 4px;
            padding: 11px 15px;
            background: var(--bg-surface);
            border: 1px solid var(--border);
            border-radius: 14px;
            border-top-left-radius: 4px;
            margin-bottom: 12px;
            align-self: flex-start;
        }

        .wa-typing.visible { display: flex; }

        .wa-typing-dot {
            width: 7px;
            height: 7px;
            background: var(--lofi-mauve);
            border-radius: 50%;
            animation: waTypingBounce 1.4s infinite ease-in-out both;
        }

        .wa-typing-dot:nth-child(1) { animation-delay: -0.32s; }
        .wa-typing-dot:nth-child(2) { animation-delay: -0.16s; }

        @keyframes waTypingBounce {
            0%, 80%, 100% { transform: scale(0); }
            40% { transform: scale(1); }
        }

        /* ===== STAGE PANELS ===== */
        .stage {
            display: none;
            background: var(--bg-glass-strong);
            backdrop-filter: blur(24px);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 24px;
            margin-bottom: 20px;
            box-shadow: var(--shadow-glass);
            animation: stageIn 0.28s ease-out;
        }

        .stage.active { display: block; }

        @keyframes stageIn {
            from { opacity: 0; transform: translateY(8px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .df-stage-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .df-stage-top h2 { margin-bottom: 0; }

        .stage-icon {
            display: inline-block;
            width: 28px;
            height: 28px;
            line-height: 28px;
            text-align: center;
            font-family: var(--font-mono);
            font-size: 12px;
            background: var(--bg-muted);
            border-radius: 6px;
            margin-right: 8px;
        }

        /* ===== WHATSAPP CHAT ===== */
        .wa-fullpage {
            background: #f0f2f5;
            border-radius: var(--radius-md);
            padding: 16px;
            margin-bottom: 20px;
        }

        .wa-header {
            background: linear-gradient(135deg, rgba(123, 159, 212, 0.9) 0%, rgba(196, 181, 232, 0.85) 100%);
            padding: 14px 18px;
            display: flex;
            align-items: center;
            gap: 14px;
            color: #fff;
        }

        .wa-avatar {
            width: 42px;
            height: 42px;
            border-radius: 12px;
            background: rgba(255, 255, 255, 0.9);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            flex-shrink: 0;
        }

        .wa-info h3 {
            margin: 0;
            font-size: 15px;
            color: #fff;
            font-weight: 600;
        }

        .wa-status {
            font-family: var(--font-mono);
            font-size: 11px;
            opacity: 0.92;
            color: rgba(255, 255, 255, 0.9);
        }

        .wa-status.typing { color: #E8F4FF; font-style: italic; }

        .wa-chat {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .wa-message {
            margin-bottom: 14px;
            display: flex;
            flex-direction: column;
        }

        .wa-message-left { align-items: flex-start; }
        .wa-message-right { align-items: flex-end; }

        .wa-bubble {
            max-width: 82%;
            padding: 11px 15px;
            border-radius: 14px;
            font-size: 14px;
            line-height: 1.55;
            box-shadow: var(--shadow-soft);
        }

        .wa-message-left .wa-bubble {
            background: var(--bg-surface);
            border: 1px solid var(--border);
            border-top-left-radius: 4px;
        }

        .wa-message-right .wa-bubble {
            background: rgba(196, 181, 232, 0.35);
            border: 1px solid rgba(196, 181, 232, 0.4);
            border-top-right-radius: 4px;
        }

        .wa-message-sender {
            font-weight: 600;
            font-size: 12px;
            margin-bottom: 4px;
            opacity: 0.8;
        }

        .wa-time {
            font-family: var(--font-mono);
            font-size: 10px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        .wa-ticks { color: var(--lofi-dusty-blue); font-size: 10px; }
        .wa-ticks.read { color: var(--accent); }

        /* ===== DASHBOARD ===== */
        .dashboard-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 14px;
            margin-bottom: 20px;
        }

        .dashboard-card {
            background: var(--bg-glass-strong);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 18px;
            text-align: center;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .dashboard-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-glass);
        }

        .dashboard-card .title {
            font-family: var(--font-mono);
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.06em;
        }

        .dashboard-card .value {
            font-size: 20px;
            font-weight: 600;
            font-variant-numeric: tabular-nums;
        }

        .dashboard-card .value.normal {
            color: var(--lofi-sage);
        }

        .dashboard-card .value.low {
            color: var(--lofi-peach);
        }

        .dashboard-card .value.active {
            color: var(--pump-active);
        }

        .dashboard-card .value.standby {
            color: var(--text-muted);
        }

        /* ===== WATER TANK ===== */
        .tank-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            margin: 20px 0;
        }

        .tank {
            width: 150px;
            height: 300px;
            border: 3px solid var(--border);
            border-radius: 10px;
            position: relative;
            overflow: hidden;
            background-color: #f8fafc;
            box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.05);
        }

        .water {
            position: absolute;
            bottom: 0;
            width: 100%;
            background-color: var(--water-color);
            transition: height 1s ease, background-color 0.4s ease;
        }

        .water.water-ok {
            background-color: #3b82f6;
        }

        .water.water-alert {
            background-color: #ef4444;
        }

        .water::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 20px;
            background: rgba(255, 255, 255, 0.3);
            animation: wave 2s infinite linear;
        }

        @keyframes wave {
            0% { transform: translateX(0); }
            100% { transform: translateX(100%); }
        }

        .float-sensor {
            position: absolute;
            left: -20px;
            width: 20px;
            height: 5px;
            background-color: var(--sensor-active);
            transition: background-color 0.3s;
        }

        .float-sensor.active {
            background-color: #ef4444;
            box-shadow: 0 0 8px rgba(239, 68, 68, 0.5);
        }

        .pump {
            margin-top: 20px;
            position: relative;
            text-align: center;
        }

        .pump-pipe {
            width: 50px;
            height: 5px;
            background-color: var(--text-secondary);
            margin: 0 auto 10px;
        }

        .pump-flow {
            position: absolute;
            top: -30px;
            left: 50%;
            transform: translateX(-50%);
            width: 5px;
            height: 30px;
            background-color: var(--water-color);
            animation: flow 1s infinite;
            display: none;
        }

        .pump-flow.active {
            display: block;
        }

        @keyframes flow {
            0% { height: 0; opacity: 0; }
            50% { opacity: 1; }
            100% { height: 30px; opacity: 0; }
        }

        .threshold {
            position: absolute;
            left: 0;
            right: 0;
            height: 2px;
            background-color: var(--lofi-peach);
            z-index: 3;
        }

        .threshold-label {
            position: absolute;
            right: -8px;
            top: -22px;
            transform: translateX(100%);
            font-size: 10px;
            font-weight: 600;
            color: #9A4A3A;
            white-space: nowrap;
            background: rgba(245, 208, 197, 0.35);
            padding: 2px 8px;
            border-radius: 6px;
            border: 1px solid rgba(245, 208, 197, 0.5);
        }

        .low-threshold { bottom: 30%; }
        .stop-threshold { bottom: 85%; }

        .float-sensor.blink {
            animation: floatBlink 0.8s ease-in-out infinite;
        }

        @keyframes floatBlink {
            0%, 100% { opacity: 1; box-shadow: 0 0 8px rgba(239, 68, 68, 0.5); }
            50% { opacity: 0.5; box-shadow: 0 0 16px rgba(239, 68, 68, 0.9); }
        }

        .pump-icon-spin {
            display: inline-block;
            animation: pumpSpin 1.2s linear infinite;
        }

        @keyframes pumpSpin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        /* ===== NARRATOR ===== */
        .narrator-bar {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            background: rgba(196, 181, 232, 0.12);
            border: 1px solid rgba(196, 181, 232, 0.28);
            border-radius: var(--radius-md);
            padding: 12px 16px;
            margin-bottom: 16px;
            animation: narratorIn 0.4s ease-out;
        }

        .narrator-icon { font-size: 18px; flex-shrink: 0; margin-top: 1px; }

        .narrator-text {
            font-size: 14px;
            line-height: 1.5;
            color: var(--text-primary);
        }

        @keyframes narratorIn {
            from { opacity: 0; transform: translateY(-4px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* ===== STAGE 3 SIMPLE VIEW ===== */
        .script-view-toggle {
            display: flex;
            gap: 8px;
            margin-bottom: 16px;
            flex-wrap: wrap;
        }

        .view-btn {
            padding: 8px 16px;
            border-radius: 99px;
            border: 1px solid var(--border);
            background: var(--bg-muted);
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
        }

        .view-btn.active {
            background: var(--lofi-lavender);
            border-color: var(--lofi-lavender);
            color: var(--text-primary);
        }

        .script-simple { display: flex; flex-direction: column; gap: 12px; }

        .simple-step {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 14px 16px;
            background: var(--bg-muted);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            opacity: 0.4;
            transform: translateX(-8px);
            transition: all 0.4s ease;
        }

        .simple-step.active {
            opacity: 1;
            transform: translateX(0);
            border-color: var(--lofi-lavender);
            box-shadow: 0 0 0 2px rgba(196, 181, 232, 0.25);
        }

        .simple-step.done {
            opacity: 1;
            transform: translateX(0);
            border-color: var(--lofi-sage);
            background: rgba(168, 197, 181, 0.12);
        }

        .simple-step-num {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--bg-glass-strong);
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: var(--font-mono);
            font-size: 12px;
            font-weight: 700;
            flex-shrink: 0;
        }

        .simple-step.active .simple-step-num { background: var(--lofi-lavender); }
        .simple-step.done .simple-step-num { background: var(--lofi-sage); color: #fff; }

        .simple-step-icon { font-size: 24px; flex-shrink: 0; }

        .simple-step-text strong {
            display: block;
            font-size: 14px;
            margin-bottom: 2px;
        }

        .simple-step-text span {
            font-size: 12px;
            color: var(--text-secondary);
        }

        .code-block.typing-line .highlight-reveal {
            animation: highlightPulse 0.6s ease;
        }

        @keyframes highlightPulse {
            0% { background-color: transparent; }
            50% { background-color: rgba(168, 197, 181, 0.5); }
            100% { background-color: rgba(168, 197, 181, 0.3); }
        }

        .pump-status {
            font-family: var(--font-mono);
            font-size: 14px;
            font-weight: 600;
            padding: 6px 12px;
            border-radius: 99px;
            background: var(--bg-muted);
            color: var(--text-secondary);
        }

        .pump-status.active {
            background: rgba(168, 197, 181, 0.25);
            color: var(--pump-active);
        }

        .pump-lamp {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            margin: 0 auto 10px;
            border: 2px solid rgba(0, 0, 0, 0.08);
            transition: background 0.3s, box-shadow 0.3s;
        }

        .pump-lamp.on {
            background: #22c55e;
            box-shadow: 0 0 14px rgba(34, 197, 94, 0.85);
        }

        .pump-lamp.off {
            background: #ef4444;
            box-shadow: 0 0 14px rgba(239, 68, 68, 0.7);
        }

        .sim-phase-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-family: var(--font-mono);
            font-size: 11px;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            padding: 6px 14px;
            border-radius: 99px;
            background: rgba(123, 159, 212, 0.12);
            border: 1px solid rgba(123, 159, 212, 0.28);
            color: var(--accent-deep);
            margin-bottom: 16px;
        }

        /* ===== BLOCK DIAGRAM (stage 2 mini) ===== */
        .block-diagram {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 12px;
        }

        .block {
            width: 180px;
            padding: 16px 12px;
            background: var(--bg-glass-strong);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            text-align: center;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-soft);
        }

        .block:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-glass);
        }

        .block.active {
            box-shadow: 0 0 0 3px rgba(196, 181, 232, 0.35), var(--shadow-glass);
            transform: scale(1.03);
            border-color: var(--lofi-lavender);
        }

        .block-icon {
            font-size: 24px;
            margin-bottom: 8px;
        }

        .block-label {
            font-size: 14px;
            font-weight: 500;
        }

        .arrow-down {
            font-size: 20px;
            color: var(--text-muted);
        }

        /* ===== SIGNAL FLOW (stage 4) ===== */
        .signal-flow-wrap {
            position: relative;
            width: 100%;
            min-height: 120px;
            padding: 12px 4px 8px;
        }

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

        .signal-flow-grid {
            position: relative;
            z-index: 2;
            display: grid;
            gap: 28px 12px;
            width: 100%;
        }

        .flow-legend {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 16px;
            margin-bottom: 14px;
            padding: 10px 14px;
            background: var(--bg-muted);
            border-radius: var(--radius-sm);
            font-size: 12px;
        }

        .flow-legend-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--text-secondary);
        }

        .flow-legend-item .dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            flex-shrink: 0;
        }

        .flow-legend-item.pending .dot { background: #d1d5db; }
        .flow-legend-item.active .dot { background: var(--lofi-lavender); box-shadow: 0 0 8px var(--lofi-lavender); animation: legendPulse 1.2s ease-in-out infinite; }
        .flow-legend-item.done .dot { background: var(--lofi-sage); }

        @keyframes legendPulse {
            0%, 100% { transform: scale(1); opacity: 1; }
            50% { transform: scale(1.25); opacity: 0.75; }
        }

        .flow-block {
            position: relative;
            padding: 28px 10px 14px;
            background: var(--bg-glass-strong);
            border: 2px solid var(--border);
            border-radius: var(--radius-md);
            text-align: center;
            transition: background 0.45s ease, border-color 0.45s ease, box-shadow 0.45s ease, transform 0.45s ease, opacity 0.45s ease;
            box-shadow: var(--shadow-soft);
            min-width: 0;
            overflow: hidden;
        }

        .flow-block-index {
            position: absolute;
            top: 8px;
            left: 8px;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: var(--bg-muted);
            color: var(--text-muted);
            font-family: var(--font-mono);
            font-size: 10px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.4s ease;
        }

        .flow-block-status {
            position: absolute;
            top: 8px;
            right: 8px;
            font-size: 9px;
            font-weight: 700;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            padding: 3px 7px;
            border-radius: 99px;
            background: rgba(0, 0, 0, 0.05);
            color: var(--text-muted);
            transition: all 0.4s ease;
        }

        .flow-active-bar {
            position: absolute;
            bottom: 0;
            left: 0;
            height: 3px;
            width: 0%;
            background: linear-gradient(90deg, var(--lofi-lavender), var(--lofi-dusty-blue));
            transition: width var(--flow-step-ms, 2600ms) linear, background 0.4s ease;
        }

        .flow-block.pending {
            opacity: 0.5;
            background: #f4f4f5;
            border-color: #e4e4e7;
        }

        .flow-block.pending .block-icon { filter: grayscale(0.6); opacity: 0.7; }

        .flow-block.active {
            opacity: 1;
            background: linear-gradient(160deg, rgba(196, 181, 232, 0.28) 0%, rgba(255, 255, 255, 0.95) 55%);
            border-color: var(--lofi-lavender);
            box-shadow: 0 0 0 3px rgba(196, 181, 232, 0.4), 0 8px 28px rgba(196, 181, 232, 0.22);
            transform: scale(1.06);
            animation: blockActiveGlow 1.4s ease-in-out infinite;
        }

        .flow-block.active .flow-block-index {
            background: var(--lofi-lavender);
            color: var(--text-primary);
            animation: indexPop 0.5s ease;
        }

        .flow-block.active .flow-block-status {
            background: var(--lofi-lavender);
            color: var(--text-primary);
            animation: statusBlink 1s ease-in-out infinite;
        }

        .flow-block.active .flow-active-bar { width: 100%; }

        .flow-block.active .block-icon {
            animation: iconBounce 0.7s ease infinite;
            filter: none;
            opacity: 1;
        }

        .flow-block.done {
            opacity: 1;
            background: linear-gradient(160deg, rgba(168, 197, 181, 0.22) 0%, rgba(255, 255, 255, 0.95) 60%);
            border-color: var(--lofi-sage);
            box-shadow: 0 0 0 2px rgba(168, 197, 181, 0.35);
            transform: scale(1);
        }

        .flow-block.done .flow-block-index {
            background: var(--lofi-sage);
            color: #fff;
        }

        .flow-block.done .flow-block-status {
            background: var(--lofi-sage);
            color: #fff;
        }

        .flow-block.done .flow-active-bar {
            width: 100%;
            background: var(--lofi-sage);
        }

        .flow-block.done .block-icon { filter: none; opacity: 1; }

        @keyframes blockActiveGlow {
            0%, 100% { box-shadow: 0 0 0 3px rgba(196, 181, 232, 0.35), 0 6px 20px rgba(196, 181, 232, 0.15); }
            50% { box-shadow: 0 0 0 5px rgba(196, 181, 232, 0.55), 0 10px 32px rgba(196, 181, 232, 0.3); }
        }

        @keyframes iconBounce {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-5px); }
        }

        @keyframes indexPop {
            0% { transform: scale(0.7); }
            60% { transform: scale(1.15); }
            100% { transform: scale(1); }
        }

        @keyframes statusBlink {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.65; }
        }

        .flow-block .block-icon { font-size: 22px; margin-bottom: 6px; transition: filter 0.4s, transform 0.4s; }
        .flow-block .block-label { font-size: 12px; font-weight: 600; line-height: 1.35; }

        .flow-path {
            fill: none;
            stroke: rgba(0, 0, 0, 0.12);
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
            transition: stroke 0.3s ease;
        }

        .flow-path.active {
            stroke: var(--lofi-lavender);
            filter: drop-shadow(0 0 4px rgba(196, 181, 232, 0.55));
            animation: drawSignalPath var(--flow-step-ms, 2600ms) ease forwards;
        }

        .flow-path.done {
            stroke: var(--lofi-sage);
            stroke-dashoffset: 0;
        }

        @keyframes drawSignalPath {
            to { stroke-dashoffset: 0; }
        }

        /* ===== SCHEMATIC (stage 5 uses signal-flow layout) ===== */
        .schematic-container {
            background: var(--bg-glass-strong);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 20px 16px;
            box-shadow: var(--shadow-soft);
        }

        .schematic-container .flow-block .block-label {
            font-family: var(--font-mono);
            font-size: 11px;
            letter-spacing: -0.01em;
        }

        .warning-box {
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            margin-top: 16px;
            font-size: 13px;
            background: rgba(245, 208, 197, 0.2);
            border: 1px solid rgba(245, 208, 197, 0.4);
            color: #9A4A3A;
        }

        /* ===== PYTHON SCRIPT ===== */
        .code-block {
            background: #1e293b;
            color: #f8fafc;
            border-radius: var(--radius-md);
            padding: 16px;
            font-family: var(--font-mono);
            overflow-x: auto;
            margin: 16px 0;
            display: none;
        }

        .code-block.active {
            display: block;
        }

        .highlight {
            background-color: rgba(168, 197, 181, 0.3);
        }

        /* ===== TERMINAL LOG ===== */
        .terminal {
            background: #1e293b;
            color: #f8fafc;
            border-radius: var(--radius-md);
            padding: 16px;
            font-family: var(--font-mono);
            height: 200px;
            overflow-y: auto;
            margin: 16px 0;
        }

        .terminal-line {
            margin-bottom: 5px;
            font-size: 13px;
        }

        .terminal-system {
            color: #93c5fd;
        }

        .terminal-stage {
            color: #a7f3d0;
        }

        .terminal-alert {
            color: #fcd34d;
        }

        .terminal-action {
            color: #fca5a5;
        }

        /* ===== REPORT ===== */
        .report-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 14px;
        }

        .report-card {
            background: var(--bg-glass-strong);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 18px;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .report-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-glass);
        }

        .report-label {
            font-family: var(--font-mono);
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 6px;
            text-transform: uppercase;
            letter-spacing: 0.06em;
        }

        .report-value {
            font-size: 16px;
            font-weight: 500;
            font-variant-numeric: tabular-nums;
        }

        /* ===== ARCHITECTURE ===== */
        .architecture-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
        }

        .layer-card {
            background: var(--bg-glass-strong);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 20px;
            box-shadow: var(--shadow-soft);
        }

        .layer-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-glass);
        }

        .layer-title {
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .layer-title .icon {
            font-size: 18px;
        }

        .layer-items {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .layer-item {
            font-size: 14px;
            padding: 8px 12px;
            background: var(--bg-muted);
            border-radius: 6px;
        }

        /* ===== SAFETY NOTES ===== */
        .safety-notes {
            background: rgba(196, 181, 232, 0.1);
            border: 1px solid rgba(196, 181, 232, 0.3);
            border-radius: var(--radius-md);
            padding: 16px;
            margin-top: 16px;
        }

        .safety-notes ul {
            padding-left: 20px;
            margin: 12px 0;
        }

        .safety-notes li {
            margin-bottom: 8px;
            font-size: 14px;
        }

        /* ===== RESPONSIVE ===== */
        @media (max-width: 768px) {
            .df-shell { padding: 16px 14px 40px; }
            .df-header h1 { font-size: 24px; }
            .subtitle { font-size: 14px; }
            .dashboard-grid, .report-grid, .architecture-grid { grid-template-columns: 1fr; }
            #stageNav { gap: 4px; padding: 10px; }
            .stage-btn::after { width: 10px; }
            .stage { padding: 18px 14px; }
            .block { width: 150px; padding: 12px 8px; }
            .flow-block { padding: 12px 8px; }
            .flow-block .block-label { font-size: 11px; }
            .signal-flow-grid { gap: 24px 8px; }
            .schematic-container .flow-block .block-label { font-size: 10px; }
            .threshold-label { font-size: 9px; right: -4px; }
            .narrator-text { font-size: 13px; }
        }

        /* Day/Night Theme Toggle */
        html[data-theme="dark"] {
            --bg-root: #0b1220;
            --bg-surface: rgba(15, 23, 42, 0.92);
            --bg-glass: rgba(30, 41, 59, 0.85);
            --bg-glass-strong: rgba(30, 41, 59, 0.92);
            --bg-muted: #1e293b;
            --text-primary: #f8fafc;
            --text-secondary: #cbd5e1;
            --text-muted: #94a3b8;
            --border: rgba(102, 126, 234, 0.35);
            --accent: #667eea;
            --accent-deep: #4f46e5;
        }

        html[data-theme="dark"] .df-grid-bg { background: var(--bg-root); }
        html[data-theme="dark"] .df-shell { background: var(--bg-root); color: var(--text-primary); }
        html[data-theme="dark"] .df-header h1 { background: linear-gradient(90deg, var(--text-primary), var(--accent-deep)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        html[data-theme="dark"] .btn { background: var(--text-primary); color: #fff; }
        html[data-theme="dark"] .btn.secondary { background: var(--bg-glass); color: var(--text-primary); border: 1px solid var(--border); }
        html[data-theme="dark"] .badge { background: var(--bg-glass); border: 1px solid var(--border); }
        html[data-theme="dark"] .stage { background: var(--bg-glass); border: 1px solid var(--border); box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3); }
        html[data-theme="dark"] .terminal { background: #111827; color: #e5e7eb; }
        html[data-theme="dark"] .terminal-system { color: #60a5fa; }
        html[data-theme="dark"] .terminal-stage { color: #34d399; }
        html[data-theme="dark"] .terminal-alert { color: #fbbf24; }
        html[data-theme="dark"] .terminal-action { color: #f87171; }
        html[data-theme="dark"] .guardrails { background: rgba(55, 65, 81, 0.5); border: 1px solid var(--border); color: var(--text-primary); }
        html[data-theme="dark"] .warning-box { background: rgba(186, 205, 242, 0.1); border: 1px solid rgba(196, 181, 232, 0.4); color: #a5b4fc; }
        html[data-theme="dark"] .architecture-grid .layer-card { background: var(--bg-glass); border: 1px solid var(--border); }
        html[data-theme="dark"] .layer-title { color: var(--text-primary); }
        html[data-theme="dark"] .layer-item { background: var(--bg-glass-strong); color: var(--text-muted); border: 1px solid var(--border); }
        html[data-theme="dark"] .ainna-theme-switch.theme-toggle { background: rgba(255, 255, 255, 0.1); border-color: rgba(255, 255, 255, 0.2); }
        html[data-theme="dark"] .ainna-theme-switch.theme-toggle:hover { background: rgba(255, 255, 255, 0.15); }
        html[data-theme="light"] .ainna-theme-switch.theme-toggle { background: rgba(255, 255, 255, 0.96); border-color: rgba(26, 26, 26, 0.14); }
        html[data-theme="light"] .ainna-theme-switch.theme-toggle:hover { background: rgba(255, 255, 255, 0.98); }