/**
 * SEO Suite - Premium QR Code Generator Stylesheet
 * Responsive, Mobile-First, Accessible, Dark Mode Supported
 */

:root {
    --qr-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --qr-bg: #f8fafc;
    --qr-card-bg: #ffffff;
    --qr-card-border: #e2e8f0;
    --qr-card-border-focus: #4f46e5;
    --qr-text-main: #0f172a;
    --qr-text-muted: #64748b;
    --qr-text-sub: #475569;
    --qr-primary: #4f46e5;
    --qr-primary-hover: #4338ca;
    --qr-primary-light: rgba(79, 70, 229, 0.08);
    --qr-indigo: #6366f1;
    --qr-emerald: #10b981;
    --qr-emerald-light: rgba(16, 185, 129, 0.1);
    --qr-danger: #ef4444;
    --qr-danger-light: rgba(239, 68, 68, 0.1);
    --qr-warning: #f59e0b;
    --qr-warning-light: rgba(245, 158, 11, 0.1);
    --qr-input-bg: #f8fafc;
    --qr-input-border: #cbd5e1;
    --qr-pill-bg: #f1f5f9;
    --qr-pill-hover: #e2e8f0;
    --qr-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --qr-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --qr-shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
    --qr-radius-lg: 20px;
    --qr-radius-md: 12px;
    --qr-radius-sm: 8px;
    --qr-transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Overrides */
[data-qr-theme="dark"], body.dark-mode-active {
    --qr-bg: #0b1120;
    --qr-card-bg: #1e293b;
    --qr-card-border: #334155;
    --qr-card-border-focus: #818cf8;
    --qr-text-main: #f8fafc;
    --qr-text-muted: #94a3b8;
    --qr-text-sub: #cbd5e1;
    --qr-primary: #818cf8;
    --qr-primary-hover: #6366f1;
    --qr-primary-light: rgba(129, 140, 248, 0.15);
    --qr-input-bg: #0f172a;
    --qr-input-border: #334155;
    --qr-pill-bg: #0f172a;
    --qr-pill-hover: #334155;
    --qr-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --qr-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --qr-shadow-lg: 0 12px 28px -4px rgba(0, 0, 0, 0.5);
}

/* Base Wrapper */
.qr-app-wrapper {
    font-family: var(--qr-font);
    color: var(--qr-text-main);
    box-sizing: border-box;
    position: relative;
    padding-bottom: 40px;
}

.qr-app-wrapper *,
.qr-app-wrapper *::before,
.qr-app-wrapper *::after {
    box-sizing: inherit;
}

/* Hero Header */
.qr-hero-section {
    position: relative;
    padding: 24px 0 16px 0;
    margin-bottom: 24px;
}

.qr-hero-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 14px;
}

.qr-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: 9999px;
    background: var(--qr-primary-light);
    color: var(--qr-primary);
    font-size: 13px;
    font-weight: 600;
    border: 1px solid rgba(99, 102, 241, 0.25);
}

.qr-status-pulse {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--qr-primary);
    box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.7);
    animation: qrPulse 2s infinite;
}

@keyframes qrPulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(99, 102, 241, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(99, 102, 241, 0); }
}

.qr-theme-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--qr-card-bg);
    border: 1px solid var(--qr-card-border);
    color: var(--qr-text-sub);
    padding: 6px 14px;
    border-radius: 9999px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--qr-transition);
}

.qr-theme-toggle-btn:hover {
    background: var(--qr-pill-hover);
    color: var(--qr-primary);
    border-color: var(--qr-primary);
}

.qr-hero-title {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.25;
    margin: 0 0 10px 0;
    color: var(--qr-text-main);
}

.qr-title-gradient {
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 50%, #06b6d4 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.qr-hero-subtitle {
    font-size: 16px;
    color: var(--qr-text-muted);
    margin: 0 0 18px 0;
    line-height: 1.5;
    max-width: 800px;
}

.qr-features-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.qr-feature-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12.5px;
    font-weight: 500;
    background: var(--qr-card-bg);
    border: 1px solid var(--qr-card-border);
    color: var(--qr-text-sub);
}

/* Main Studio Layout: 2 Columns on Desktop */
.qr-studio-grid {
    display: grid;
    grid-template-columns: 1.45fr 1fr;
    gap: 24px;
    align-items: start;
    margin-bottom: 30px;
}

/* Left Column: Form & Customization */
.qr-editor-card {
    background: var(--qr-card-bg);
    border: 1px solid var(--qr-card-border);
    border-radius: var(--qr-radius-lg);
    box-shadow: var(--qr-shadow-lg);
    padding: 24px;
    position: relative;
    transition: var(--qr-transition);
}

/* QR Type Selector Tabs */
.qr-types-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 22px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--qr-card-border);
}

.qr-type-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 14px;
    border-radius: 10px;
    background: var(--qr-pill-bg);
    border: 1px solid var(--qr-card-border);
    color: var(--qr-text-sub);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--qr-transition);
}

.qr-type-btn:hover {
    background: var(--qr-pill-hover);
    color: var(--qr-primary);
    border-color: var(--qr-primary);
}

.qr-type-btn.is-active {
    background: var(--qr-primary);
    color: #ffffff;
    border-color: var(--qr-primary);
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

.qr-type-btn i {
    font-size: 13px;
}

/* Form Container */
.qr-form-section {
    margin-bottom: 24px;
}

.qr-form-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.qr-form-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--qr-text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.qr-example-btn {
    font-size: 12px;
    font-weight: 600;
    color: var(--qr-primary);
    background: var(--qr-primary-light);
    border: 1px solid rgba(79, 70, 229, 0.2);
    padding: 4px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--qr-transition);
}

.qr-example-btn:hover {
    background: var(--qr-primary);
    color: #ffffff;
}

/* Form Fields */
.qr-input-group {
    margin-bottom: 16px;
}

.qr-input-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--qr-text-main);
    margin-bottom: 6px;
}

.qr-input-group .qr-hint {
    font-size: 11.5px;
    color: var(--qr-text-muted);
    margin-top: 4px;
}

.qr-form-control {
    width: 100%;
    padding: 10px 14px;
    border-radius: var(--qr-radius-sm);
    border: 1.5px solid var(--qr-input-border);
    background: var(--qr-input-bg);
    color: var(--qr-text-main);
    font-size: 14px;
    font-family: inherit;
    transition: var(--qr-transition);
    outline: none;
}

.qr-form-control:focus {
    border-color: var(--qr-card-border-focus);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.qr-form-control::placeholder {
    color: var(--qr-text-muted);
    opacity: 0.6;
}

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

.qr-form-row-3 {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
}

/* Validation Alert */
.qr-validation-msg {
    padding: 8px 12px;
    border-radius: 6px;
    background: var(--qr-danger-light);
    color: var(--qr-danger);
    font-size: 12.5px;
    font-weight: 600;
    margin-bottom: 14px;
    display: none;
    align-items: center;
    gap: 6px;
}

.qr-validation-msg.is-visible {
    display: flex;
}

/* =============================================================================
   Customization Panel
   ============================================================================= */
.qr-custom-accordion {
    border-top: 1px solid var(--qr-card-border);
    padding-top: 18px;
}

.qr-custom-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.qr-custom-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--qr-text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.qr-reset-btn {
    font-size: 12px;
    color: var(--qr-text-muted);
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.2s;
    font-weight: 600;
}

.qr-reset-btn:hover {
    color: var(--qr-danger);
}

/* Customization Options Grid */
.qr-options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 18px;
}

.qr-option-box {
    background: var(--qr-input-bg);
    border: 1px solid var(--qr-card-border);
    border-radius: var(--qr-radius-md);
    padding: 12px 14px;
}

.qr-option-box label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12.5px;
    font-weight: 700;
    color: var(--qr-text-sub);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.qr-color-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.qr-color-input {
    width: 38px;
    height: 38px;
    border: none;
    padding: 0;
    border-radius: 6px;
    cursor: pointer;
    background: transparent;
}

.qr-color-hex {
    flex: 1;
    font-family: monospace;
    font-size: 13px;
    font-weight: 600;
}

/* Quick Palette Chips */
.qr-palette-row {
    display: flex;
    gap: 6px;
    margin-top: 8px;
    flex-wrap: wrap;
}

.qr-color-chip {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    cursor: pointer;
    border: 1.5px solid #ffffff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.25);
    transition: transform 0.15s;
}

.qr-color-chip:hover {
    transform: scale(1.2);
}

/* Style Selectors */
.qr-style-pills {
    display: flex;
    gap: 6px;
}

.qr-style-btn {
    flex: 1;
    padding: 6px 10px;
    border-radius: 6px;
    background: var(--qr-card-bg);
    border: 1px solid var(--qr-card-border);
    font-size: 12px;
    font-weight: 600;
    color: var(--qr-text-sub);
    cursor: pointer;
    text-align: center;
    transition: var(--qr-transition);
}

.qr-style-btn:hover {
    border-color: var(--qr-primary);
    color: var(--qr-primary);
}

.qr-style-btn.is-active {
    background: var(--qr-primary);
    color: #ffffff;
    border-color: var(--qr-primary);
}

/* Logo Upload Box */
.qr-logo-upload-box {
    margin-top: 14px;
    background: var(--qr-input-bg);
    border: 1.5px dashed var(--qr-card-border);
    border-radius: var(--qr-radius-md);
    padding: 14px;
    text-align: center;
    position: relative;
    transition: var(--qr-transition);
}

.qr-logo-upload-box:hover {
    border-color: var(--qr-primary);
}

.qr-logo-upload-box.has-logo {
    border-style: solid;
    border-color: var(--qr-emerald);
}

.qr-logo-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 6px;
    background: var(--qr-card-bg);
    border: 1px solid var(--qr-card-border);
    font-size: 12.5px;
    font-weight: 600;
    color: var(--qr-text-main);
    cursor: pointer;
}

.qr-logo-controls {
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-top: 10px;
}

.qr-logo-controls.is-visible {
    display: flex;
}

.qr-logo-thumb-preview {
    width: 36px;
    height: 36px;
    object-fit: contain;
    border-radius: 4px;
    background: #ffffff;
    border: 1px solid var(--qr-card-border);
}

/* =============================================================================
   Right Column: Sticky Preview & Actions
   ============================================================================= */
.qr-preview-card {
    background: var(--qr-card-bg);
    border: 1px solid var(--qr-card-border);
    border-radius: var(--qr-radius-lg);
    box-shadow: var(--qr-shadow-lg);
    padding: 24px;
    text-align: center;
    position: sticky;
    top: 24px;
    transition: var(--qr-transition);
}

.qr-preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.qr-preview-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--qr-text-main);
}

.qr-scannable-pill {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 9999px;
    font-size: 11.5px;
    font-weight: 700;
    background: var(--qr-emerald-light);
    color: var(--qr-emerald);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Canvas Viewport */
.qr-canvas-wrapper {
    background: #ffffff;
    border: 1px solid var(--qr-card-border);
    border-radius: var(--qr-radius-md);
    padding: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--qr-shadow-sm);
    margin-bottom: 18px;
    position: relative;
    max-width: 100%;
}

#qrCanvas {
    max-width: 100%;
    height: auto !important;
    display: block;
}

/* Payload Preview Badge */
.qr-payload-badge {
    background: var(--qr-input-bg);
    border: 1px solid var(--qr-card-border);
    border-radius: 6px;
    padding: 8px 12px;
    font-size: 12px;
    color: var(--qr-text-muted);
    margin-bottom: 18px;
    word-break: break-all;
    text-align: left;
    max-height: 60px;
    overflow-y: auto;
}

/* Download Actions */
.qr-download-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 12px;
}

.qr-btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: var(--qr-radius-sm);
    background: var(--qr-primary);
    color: #ffffff;
    font-size: 13.5px;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: var(--qr-transition);
}

.qr-btn-primary:hover {
    background: var(--qr-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.35);
}

.qr-btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: var(--qr-radius-sm);
    background: var(--qr-card-bg);
    color: var(--qr-text-main);
    border: 1px solid var(--qr-card-border);
    font-size: 13.5px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--qr-transition);
}

.qr-btn-secondary:hover {
    background: var(--qr-pill-hover);
    border-color: var(--qr-primary);
    color: var(--qr-primary);
}

.qr-sub-actions-row {
    display: flex;
    gap: 8px;
    margin-bottom: 14px;
}

.qr-sub-actions-row button {
    flex: 1;
    padding: 7px 10px;
    font-size: 12.5px;
    font-weight: 600;
}

/* Filename Box */
.qr-filename-box {
    margin-bottom: 14px;
}

.qr-filename-input {
    width: 100%;
    padding: 7px 12px;
    font-size: 12.5px;
    border-radius: var(--qr-radius-sm);
    border: 1px solid var(--qr-card-border);
    background: var(--qr-input-bg);
    color: var(--qr-text-main);
    outline: none;
}

/* =============================================================================
   Scanner & Templates Utility Drawer
   ============================================================================= */
.qr-utils-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

.qr-util-card {
    background: var(--qr-card-bg);
    border: 1px solid var(--qr-card-border);
    border-radius: var(--qr-radius-lg);
    box-shadow: var(--qr-shadow-md);
    padding: 20px;
}

.qr-util-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.qr-util-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--qr-text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Template Chips */
.qr-template-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.qr-template-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 12px;
    border-radius: 8px;
    background: var(--qr-pill-bg);
    border: 1px solid var(--qr-card-border);
    font-size: 12.5px;
    font-weight: 600;
    color: var(--qr-text-sub);
    cursor: pointer;
    transition: var(--qr-transition);
}

.qr-template-chip:hover {
    background: var(--qr-primary-light);
    color: var(--qr-primary);
    border-color: var(--qr-primary);
}

/* Scanner Container */
.qr-scanner-box {
    position: relative;
    background: var(--qr-input-bg);
    border: 1.5px dashed var(--qr-card-border);
    border-radius: var(--qr-radius-md);
    padding: 16px;
    text-align: center;
}

.qr-scanner-viewport {
    width: 100%;
    min-height: 180px;
    border-radius: 8px;
    overflow: hidden;
    background: #000000;
    display: none;
    margin-bottom: 12px;
}

.qr-scanner-viewport.is-active {
    display: block;
}

.qr-scanner-result {
    display: none;
    padding: 10px 12px;
    background: var(--qr-card-bg);
    border: 1px solid var(--qr-emerald);
    border-radius: 6px;
    font-size: 13px;
    text-align: left;
    margin-top: 10px;
    word-break: break-all;
}

.qr-scanner-result.is-visible {
    display: block;
}

/* Recent Generations */
.qr-recent-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 200px;
    overflow-y: auto;
}

.qr-recent-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    background: var(--qr-input-bg);
    border: 1px solid var(--qr-card-border);
    border-radius: 6px;
    font-size: 12.5px;
    cursor: pointer;
    transition: var(--qr-transition);
}

.qr-recent-item:hover {
    border-color: var(--qr-primary);
    background: var(--qr-primary-light);
}

.qr-recent-type-badge {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    padding: 2px 6px;
    border-radius: 4px;
    background: var(--qr-card-bg);
    border: 1px solid var(--qr-card-border);
    color: var(--qr-primary);
}

/* =============================================================================
   SEO Guide & FAQ Article
   ============================================================================= */
.qr-article {
    background: var(--qr-card-bg);
    border: 1px solid var(--qr-card-border);
    border-radius: var(--qr-radius-lg);
    box-shadow: var(--qr-shadow-sm);
    padding: 32px;
    margin-bottom: 30px;
    line-height: 1.7;
    color: var(--qr-text-sub);
}

.qr-article h2 {
    font-size: 22px;
    font-weight: 800;
    color: var(--qr-text-main);
    margin: 28px 0 12px 0;
    letter-spacing: -0.01em;
}

.qr-article h2:first-child {
    margin-top: 0;
}

.qr-article h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--qr-text-main);
    margin: 20px 0 8px 0;
}

.qr-article p {
    font-size: 14.5px;
    margin-bottom: 16px;
}

.qr-article ul, .qr-article ol {
    margin: 0 0 18px 22px;
    padding: 0;
}

.qr-article li {
    font-size: 14.5px;
    margin-bottom: 8px;
}

.qr-compare-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 13.5px;
}

.qr-compare-table th {
    text-align: left;
    padding: 10px 14px;
    background: var(--qr-input-bg);
    color: var(--qr-text-muted);
    font-weight: 700;
    font-size: 12px;
    text-transform: uppercase;
    border-bottom: 1px solid var(--qr-card-border);
}

.qr-compare-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--qr-card-border);
    color: var(--qr-text-main);
}

.qr-compare-table tr:hover td {
    background: var(--qr-primary-light);
}

/* FAQ Grid */
.qr-faq-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 18px;
}

.qr-faq-card {
    background: var(--qr-input-bg);
    border: 1px solid var(--qr-card-border);
    border-radius: var(--qr-radius-md);
    padding: 18px 20px;
    transition: var(--qr-transition);
}

.qr-faq-card h3 {
    font-size: 15.5px;
    font-weight: 700;
    color: var(--qr-text-main);
    margin: 0 0 8px 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.qr-faq-card h3 i {
    color: var(--qr-primary);
    font-size: 15px;
}

.qr-faq-card p {
    font-size: 14px;
    margin: 0;
    color: var(--qr-text-sub);
}

/* Toast */
.qr-toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: #0f172a;
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 12px 20px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
    z-index: 100000;
    transform: translateY(100px);
    opacity: 0;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s;
    pointer-events: none;
}

.qr-toast.is-active {
    transform: translateY(0);
    opacity: 1;
}

.qr-toast i {
    color: #34d399;
}

/* Print View Styles */
@media print {
    body * {
        visibility: hidden;
    }
    #printSection, #printSection * {
        visibility: visible;
    }
    #printSection {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        text-align: center;
        padding: 40px;
    }
}

/* =============================================================================
   Responsive Media Queries
   ============================================================================= */
@media (max-width: 991px) {
    .qr-studio-grid {
        grid-template-columns: 1fr;
    }
    .qr-preview-card {
        position: static;
    }
    .qr-utils-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 767px) {
    .qr-hero-title {
        font-size: 24px;
    }
    .qr-editor-card, .qr-preview-card {
        padding: 20px 16px;
    }
    .qr-options-grid {
        grid-template-columns: 1fr;
    }
    .qr-form-row, .qr-form-row-3 {
        grid-template-columns: 1fr;
    }
    .qr-types-bar {
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 8px;
        -webkit-overflow-scrolling: touch;
    }
    .qr-type-btn {
        flex-shrink: 0;
    }
    .qr-article {
        padding: 20px 16px;
    }
}