/* ==========================================================================
   FREE QR CODE GENERATOR - MODERN DESIGN SYSTEM & RESPONSIVE STYLES
   ========================================================================== */

:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-subtle: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-light: #e0e7ff;
  --color-primary-focus: rgba(79, 70, 229, 0.25);
  
  --color-success: #10b981;
  --color-success-light: #ecfdf5;
  --color-success-border: #a7f3d0;
  --color-warning: #f59e0b;
  --color-warning-light: #fffbeb;
  --color-warning-border: #fde68a;
  --color-danger: #ef4444;
  --color-danger-light: #fef2f2;
  --color-danger-border: #fecaca;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ==========================================================================
   LAYOUT CONTAINERS
   ========================================================================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ==========================================================================
   HEADER & NAVBAR
   ========================================================================== */

.site-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-text-primary);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.025em;
}

.brand-icon {
  width: 2.25rem;
  height: 2.25rem;
  color: var(--color-primary);
}

.header-nav {
  display: none;
  align-items: center;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .header-nav {
    display: flex;
  }
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-link:hover {
  color: var(--color-primary);
}

.header-badges {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background-color: var(--color-success-light);
  color: #065f46;
  border: 1px solid var(--color-success-border);
}

.pill-badge.privacy {
  background-color: var(--color-primary-light);
  color: #3730a3;
  border-color: #c7d2fe;
}

/* ==========================================================================
   HERO / INTRO SECTION
   ========================================================================== */

.hero-section {
  padding: 2.5rem 0 1.5rem;
  text-align: center;
}

.hero-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--color-text-primary);
  margin-bottom: 0.75rem;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--color-text-secondary);
  max-width: 44rem;
  margin: 0 auto 1.5rem;
}

.trust-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1.25rem 2rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.trust-item svg {
  width: 1.125rem;
  height: 1.125rem;
  color: var(--color-primary);
}

/* ==========================================================================
   APP WORKSPACE GRID
   ========================================================================== */

.workspace-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  margin-bottom: 3.5rem;
}

@media (min-width: 900px) {
  .workspace-grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }
}

.panel-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
}

.panel-header {
  margin-bottom: 1.25rem;
}

.panel-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

.panel-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

/* ==========================================================================
   INPUT FORM CONTROLS
   ========================================================================== */

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.label-actions {
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.btn-clear-text {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.125rem 0.5rem;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-clear-text:hover {
  background-color: var(--color-danger-light);
  color: var(--color-danger);
  border-color: var(--color-danger-border);
}

.counter-badge {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.input-wrapper {
  position: relative;
}

.text-input {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  resize: vertical;
  min-height: 5.5rem;
}

.text-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-focus);
}

/* Modern HTML5 User Invalid states */
.text-input:user-invalid {
  border-color: var(--color-danger);
  background-color: var(--color-danger-light);
}

.url-suggestion {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  background-color: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-sm);
  color: #1e40af;
}

.url-suggestion.active {
  display: flex;
}

.url-suggestion-btn {
  background: none;
  border: none;
  padding: 0;
  font-weight: 600;
  text-decoration: underline;
  color: var(--color-primary);
  cursor: pointer;
}

/* Sample Quick Presets */
.preset-templates {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.625rem;
}

.preset-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.preset-btn {
  background-color: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.preset-btn:hover {
  background-color: var(--color-primary-light);
  border-color: #c7d2fe;
  color: var(--color-primary);
}

/* ==========================================================================
   CUSTOMIZATION CONTROLS
   ========================================================================== */

.customizer-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1.25rem;
}

/* Color Pickers Grid */
.colors-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.color-control {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.color-input-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.375rem 0.5rem;
  background-color: var(--color-surface);
}

.color-input-box:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-focus);
}

input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  border: none;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: none;
}

input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}

input[type="color"]::-webkit-color-swatch {
  border: 1px solid rgba(0, 0, 0, 0.15);
  border-radius: var(--radius-sm);
}

.color-hex-text {
  border: none;
  outline: none;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  width: 100%;
  color: var(--color-text-primary);
}

/* Color Swatch Presets */
.color-swatches {
  display: flex;
  gap: 0.375rem;
  margin-top: 0.25rem;
}

.swatch-btn {
  width: 1.375rem;
  height: 1.375rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(0, 0, 0, 0.15);
  cursor: pointer;
  transition: transform 0.1s ease;
}

.swatch-btn:hover {
  transform: scale(1.15);
}

/* Contrast Status Banner */
.contrast-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  background-color: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
}

.contrast-banner.good {
  background-color: var(--color-success-light);
  border-color: var(--color-success-border);
  color: #065f46;
}

.contrast-banner.warning {
  background-color: var(--color-warning-light);
  border-color: var(--color-warning-border);
  color: #92400e;
}

.contrast-banner.critical {
  background-color: var(--color-danger-light);
  border-color: var(--color-danger-border);
  color: #991b1b;
}

/* Option Button Segmented Controls */
.segmented-group {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.375rem;
  background-color: var(--color-surface-subtle);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.segmented-btn {
  padding: 0.5rem 0.25rem;
  font-size: 0.8125rem;
  font-weight: 600;
  text-align: center;
  border: none;
  background: none;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.segmented-btn:hover {
  color: var(--color-text-primary);
}

.segmented-btn.active {
  background-color: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

/* Range Slider */
.slider-control {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.range-slider {
  flex: 1;
  accent-color: var(--color-primary);
  height: 0.375rem;
  cursor: pointer;
}

.slider-val {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  min-width: 2rem;
  text-align: right;
  color: var(--color-text-primary);
}

/* Form Action Buttons */
.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-hover);
}

.btn-secondary {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

.btn-secondary:hover {
  background-color: var(--color-surface-subtle);
  border-color: var(--color-border-hover);
}

.btn-sm {
  padding: 0.4375rem 0.75rem;
  font-size: 0.8125rem;
}

/* ==========================================================================
   PREVIEW PANEL
   ========================================================================== */

.preview-panel {
  position: sticky;
  top: 5.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.preview-box {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 1 / 1;
  background-color: var(--color-surface-subtle);
  border: 1.5px dashed var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
}

.preview-box.has-qr {
  border-style: solid;
  border-color: var(--color-border);
  background-color: var(--color-surface);
}

#qrCanvas {
  max-width: 100%;
  max-height: 100%;
  display: block;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
}

.empty-state svg {
  width: 3rem;
  height: 3rem;
  opacity: 0.5;
}

.export-actions {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.download-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.copy-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.qr-meta-details {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
  margin-top: 0.5rem;
}

/* Toast Message */
.toast-msg {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: #1e293b;
  color: #ffffff;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-xl);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease;
  z-index: 50;
}

.toast-msg.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ==========================================================================
   EDUCATIONAL & SEO CONTENT SECTIONS
   ========================================================================== */

.content-section {
  padding: 3.5rem 0;
  border-top: 1px solid var(--color-border);
}

.section-header {
  text-align: center;
  max-width: 48rem;
  margin: 0 auto 2.5rem;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

/* 3-Step Guide Cards */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.step-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.step-num {
  width: 2.25rem;
  height: 2.25rem;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

.step-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.step-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Comparison Table (Static vs Dynamic) */
.comparison-box {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-top: 1.5rem;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.comparison-table th,
.comparison-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
  background-color: var(--color-surface-subtle);
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--color-text-primary);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table td {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.highlight-col {
  background-color: #f5f3ff;
  font-weight: 600;
  color: var(--color-primary) !important;
}

/* FAQ Accordion Section */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  max-width: 52rem;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .faq-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.faq-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.faq-q {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.faq-a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   RELATED TOOLS & FUTURE UTILITIES DIRECTORY
   ========================================================================== */

.tools-directory-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.tool-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  position: relative;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.tool-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.tool-card.active-tool {
  border-color: #c7d2fe;
}

.tool-status-badge {
  align-self: flex-start;
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tool-status-badge.active {
  background-color: var(--color-success-light);
  color: #065f46;
  border: 1px solid var(--color-success-border);
}

.tool-status-badge.upcoming {
  background-color: var(--color-surface-subtle);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.tool-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.tool-desc {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  flex: 1;
}

.tool-action-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  cursor: pointer;
}

.tool-action-link:hover {
  text-decoration: underline;
}

.tool-meta-note {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.site-footer {
  margin-top: auto;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1rem;
}

.footer-privacy-promise {
  max-width: 36rem;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  background-color: var(--color-surface-subtle);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

/* ==========================================================================
   ADSTERRA ADVERTISING STYLES
   ========================================================================== */

.ad-container-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  margin: 2.5rem 0 1.5rem 0;
  padding: 0 1rem;
  box-sizing: border-box;
}

.ad-banner-468 {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60px;
  max-width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-md);
}

.ad-banner-468 iframe {
  max-width: 100%;
}