:root {
    --qr-bg-main: #f8fafc;
    --qr-card-surface: #ffffff;
    --qr-primary-gradient: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    --qr-primary-hover: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
    --qr-secondary-color: #64748b;
    --qr-dark-slate: #0f172a;
    --qr-border-light: #e2e8f0;
    --qr-input-focus: #3b82f6;
    --qr-error-bg: #fef2f2;
    --qr-error-txt: #dc2626;
    --qr-radius-lg: 16px;
    --qr-radius-md: 10px;
    --qr-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
}

/* Wrapper Scoping Isolation layer */
#qr-tool-container.qr-wrapper {
    font-family: var(--qr-font-family);
    background-color: var(--qr-bg-main);
    padding: 30px;
    border-radius: var(--qr-radius-lg);
    box-sizing: border-box;
    max-width: 1140px;
    margin: 20px auto;
    color: var(--qr-dark-slate);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
}

#qr-tool-container * {
    box-sizing: border-box;
    transition: all 0.25s ease;
}

/* Grid Dashboard Core Layout */
.qr-dashboard {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 30px;
    align-items: start;
}

.qr-panel-left, .qr-panel-right {
    background-color: var(--qr-card-surface);
    border-radius: var(--qr-radius-lg);
    padding: 25px;
    border: 1px solid var(--qr-border-light);
}

.qr-panel-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--qr-border-light);
    color: var(--qr-dark-slate);
    display: flex;
    align-items: center;
    gap: 10px;
}

.qr-panel-title i {
    color: #2563eb;
}

/* Tab Filtering Segment Row Controls */
.qr-type-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 20px;
}

@media(max-width: 768px) {
    .qr-type-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.qr-type-btn {
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
    padding: 10px 6px;
    border-radius: var(--qr-radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--qr-secondary-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.qr-type-btn i {
    font-size: 1.1rem;
}

.qr-type-btn:hover {
    background: #e2e8f0;
    color: var(--qr-dark-slate);
}

.qr-type-btn.active {
    background: var(--qr-primary-gradient);
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

/* Context Switchable Field Elements */
.fields-context {
    display: none !important;
}

.fields-context.dynamic-active {
    display: block !important;
    animation: qrFadeIn 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.qr-input-form-wrapper {
    background: #f8fafc;
    border-radius: var(--qr-radius-md);
    padding: 20px;
    border: 1px solid var(--qr-border-light);
    margin-bottom: 25px;
    min-height: 160px;
}

.qr-input-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 6px;
    color: var(--qr-dark-slate);
}

.qr-input-group label.sub-label {
    margin-top: 12px;
}

.qr-field {
    width: 100% !important;
    padding: 10px 14px !important;
    border: 1px solid var(--qr-border-light) !important;
    background-color: #ffffff !important;
    color: var(--qr-dark-slate) !important;
    border-radius: 8px !important;
    font-size: 0.95rem !important;
    outline: none !important;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.02) !important;
}

.qr-field:focus {
    border-color: var(--qr-input-focus) !important;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15) !important;
}

.qr-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

/* Collapsible Multi-Settings Panel Container */
.qr-settings-panel {
    border: 1px solid var(--qr-border-light);
    border-radius: var(--qr-radius-md);
    margin-bottom: 25px;
    overflow: hidden;
}

.qr-settings-toggle {
    background: #f1f5f9;
    margin: 0;
    padding: 14px 20px;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.qr-settings-toggle:hover {
    background: #e2e8f0;
}

.qr-settings-toggle .arrow-state {
    font-size: 0.8rem;
    transform: rotate(0deg);
}

.qr-settings-panel.open .arrow-state {
    transform: rotate(180deg);
}

.qr-settings-content {
    display: none;
    padding: 20px;
    background: #ffffff;
    border-top: 1px solid var(--qr-border-light);
}

.qr-settings-panel.open .qr-settings-content {
    display: block;
}

.qr-control-row {
    margin-bottom: 16px;
}

.qr-control-row label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 8px;
    color: var(--qr-secondary-color);
}

.slider-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
}

.slider-wrapper input[type="range"] {
    flex: 1;
    cursor: pointer;
    accent-color: #2563eb;
}

.slider-wrapper span {
    font-weight: 700;
    font-size: 0.85rem;
    background: #e2e8f0;
    padding: 3px 8px;
    border-radius: 4px;
    min-width: 50px;
    text-align: center;
}

.qr-control-flex-row {
    display: flex;
    gap: 20px;
    margin-bottom: 16px;
}

.color-picker-block {
    flex: 1;
}

.color-picker-block label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 6px;
    color: var(--qr-secondary-color);
}

.color-picker-input-wrap input[type="color"] {
    border: 1px solid var(--qr-border-light);
    padding: 2px;
    width: 100%;
    height: 38px;
    border-radius: 6px;
    background: none;
    cursor: pointer;
}

.asset-uploader .upload-btn-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.asset-uploader input[type="file"] {
    font-size: 0.8rem;
}

.qr-action-btn-sm {
    background: #ef4444;
    color: white;
    border: none;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
}

/* Execution Operations Buttons Row */
.qr-action-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 12px;
}

.qr-btn-primary {
    background: var(--qr-primary-gradient);
    color: #ffffff !important;
    border: none;
    padding: 14px 20px;
    border-radius: var(--qr-radius-md);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.qr-btn-primary:hover {
    background: var(--qr-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.qr-btn-secondary {
    background: #ffffff;
    color: var(--qr-secondary-color) !important;
    border: 1px solid var(--qr-border-light);
    padding: 14px 10px;
    border-radius: var(--qr-radius-md);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
}

.qr-btn-secondary:hover {
    background: #f1f5f9;
    color: var(--qr-dark-slate) !important;
}

/* Rendering Feedback Notices UI element */
.qr-ui-error {
    background-color: var(--qr-error-bg);
    border: 1px solid #fca5a5;
    color: var(--qr-error-txt);
    padding: 12px 16px;
    border-radius: var(--qr-radius-md);
    margin-top: 15px;
    font-size: 0.85rem;
    font-weight: 600;
    animation: qrFadeIn 0.25s ease;
}

/* Output Live View Display Matrix Container Styling (Right Box Panel) */
.qr-output-card {
    background: #f8fafc;
    border: 1px solid var(--qr-border-light);
    border-radius: var(--qr-radius-md);
    padding: 30px;
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 280px;
}

.qr-preview-render-zone {
    padding: 16px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    display: inline-block;
    max-width: 100%;
    overflow: auto;
}

.qr-preview-render-zone canvas, .qr-preview-render-zone img {
    display: block;
    margin: 0 auto;
    max-width: 100%;
    height: auto !important;
}

.qr-output-meta-spec {
    margin-top: 12px;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--qr-secondary-color);
    background: #e2e8f0;
    padding: 2px 10px;
    border-radius: 20px;
}

/* Download Engine Format Flex Blocks Matrix */
.download-format-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 12px;
}

.qr-download-btn {
    color: white !important;
    border: none;
    padding: 10px 8px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.qr-download-btn.btn-png { background: #10b981; }
.qr-download-btn.btn-png:hover { background: #059669; }
.qr-download-btn.btn-jpg { background: #f59e0b; }
.qr-download-btn.btn-jpg:hover { background: #d97706; }
.qr-download-btn.btn-svg { background: #8b5cf6; }
.qr-download-btn.btn-svg:hover { background: #7c3aed; }

.qr-btn-utility {
    width: 100%;
    background: #ffffff;
    color: var(--qr-dark-slate) !important;
    border: 1px solid var(--qr-border-light);
    padding: 10px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.qr-btn-utility:hover {
    background: #f1f5f9;
}

/* System Engine Execution Logs (History Framework UI Markup) */
.qr-history-container {
    margin-top: 25px;
    border-top: 1px dashed var(--qr-border-light);
    padding-top: 20px;
}

.qr-history-container h4 {
    margin: 0 0 12px 0;
    font-size: 0.9rem;
    color: var(--qr-dark-slate);
    font-weight: 700;
}

.qr-history-list-items {
    list-style: none !important;
    padding: 0 !important;
    margin: 0 !important;
}

.qr-history-list-items li {
    padding: 8px 12px !important;
    background: #f8fafc !important;
    border: 1px solid var(--qr-border-light) !important;
    border-radius: 6px !important;
    font-size: 0.8rem !important;
    margin-bottom: 6px !important;
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    font-weight: 500;
    color: var(--qr-secondary-color);
}

.qr-history-list-items li.empty-msg {
    justify-content: center !important;
    font-style: italic;
    background: transparent !important;
    border: none !important;
}

.qr-history-list-items .restore-log-item {
    background: #2563eb;
    color: white;
    border: none;
    padding: 2px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
}

.qr-history-list-items .restore-log-item:hover {
    background: #1d4ed8;
}

/* Responsive Structural Breakpoint Breakdowns Matrix */
@media (max-width: 900px) {
    .qr-dashboard {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Dark Mode Universal System Detection Stylesheet Adaptation Injection */
@media (prefers-color-scheme: dark) {
    :root {
        --qr-bg-main: #0f172a;
        --qr-card-surface: #1e293b;
        --qr-dark-slate: #f8fafc;
        --qr-border-light: #334155;
        --qr-secondary-color: #94a3b8;
    }
    .qr-input-form-wrapper, .qr-settings-toggle, .qr-output-card, .qr-history-list-items li {
        background: #111827 !important;
    }
    .qr-field {
        background-color: #1e293b !important;
        border-color: #334155 !important;
    }
    .qr-type-btn {
        background: #1e293b;
        border-color: #334155;
    }
    .qr-type-btn:hover {
        background: #334155;
    }
    .slider-wrapper span {
        background: #334155;
        color: #ffffff;
    }
    .qr-settings-content {
        background: #1e293b;
    }
    .qr-btn-secondary, .qr-btn-utility {
        background: #1e293b;
    }
    .qr-btn-secondary:hover, .qr-btn-utility:hover {
        background: #334155;
    }
}