/* ============================================================
   QR Code Generator — style.css
   Mobile-first, responsive, modern (Blues/Indigos + clean whites)
   ============================================================ */

/* --------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------- */
:root {
  /* Colors */
  --color-primary:       #4f46e5; /* indigo-600 */
  --color-primary-hover: #4338ca; /* indigo-700 */
  --color-primary-light: #eef2ff; /* indigo-50 */
  --color-secondary:     #0ea5e9; /* sky-500 */
  --color-accent:        #6366f1; /* indigo-500 */

  --color-text:          #111827; /* gray-900 */
  --color-text-muted:    #6b7280; /* gray-500 */
  --color-text-light:    #9ca3af; /* gray-400 */

  --color-bg:            #ffffff;
  --color-bg-subtle:     #f9fafb; /* gray-50 */
  --color-bg-muted:      #f3f4f6; /* gray-100 */

  --color-border:        #e5e7eb; /* gray-200 */
  --color-border-focus:  #4f46e5;

  --color-success:       #10b981;
  --color-error:         #ef4444;
  --color-warning:       #f59e0b;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;

  --font-normal:   400;
  --font-medium:   500;
  --font-semibold: 600;
  --font-bold:     700;
  --font-extrabold:800;

  --leading-tight:  1.25;
  --leading-normal: 1.5;
  --leading-relaxed:1.625;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border radius */
  --radius-sm:   0.25rem;
  --radius-md:   0.5rem;
  --radius-lg:   0.75rem;
  --radius-xl:   1rem;
  --radius-2xl:  1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --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);
  --shadow-focus: 0 0 0 3px rgb(79 70 229 / 0.2);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow:   350ms ease;

  /* Layout */
  --container-max: 1200px;
  --header-height: 64px;
}

/* --------------------------------------------------
   Reset & Base Styles
   -------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--color-text);
}

/* --------------------------------------------------
   Utility Classes
   -------------------------------------------------- */
[hidden] {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

/* --------------------------------------------------
   Header
   -------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: var(--space-4);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-text);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-6);
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* Ad Leaderboard (below nav) */
.ad-leaderboard {
  display: flex;
  justify-content: center;
  padding: var(--space-2) 0;
  overflow: hidden;
}

/* --------------------------------------------------
   Hero Section
   -------------------------------------------------- */
.hero {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, #e0e7ff 50%, #ede9fe 100%);
  padding: var(--space-12) 0 var(--space-10);
  text-align: center;
}

.hero-content {
  max-width: 700px;
  margin-inline: auto;
}

.hero h1 {
  font-size: var(--text-4xl);
  font-weight: var(--font-extrabold);
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  background-color: var(--color-bg);
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  border: 1.5px solid var(--color-primary);
  border-radius: var(--radius-full);
}

/* --------------------------------------------------
   Generator Section
   -------------------------------------------------- */
.generator-section {
  padding: var(--space-12) 0;
  background-color: var(--color-bg);
}

.generator-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

/* Form Panel */
.form-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.required {
  color: var(--color-error);
  margin-left: var(--space-1);
}

.form-optional {
  font-weight: var(--font-normal);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.form-control {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-focus);
}

.form-control:hover:not(:focus) {
  border-color: #9ca3af;
}

.form-control.is-invalid {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgb(239 68 68 / 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-10);
  cursor: pointer;
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--color-error);
  font-weight: var(--font-medium);
  min-height: 1.25rem;
}

/* Color Picker */
.color-picker-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast);
  cursor: pointer;
  min-height: 46px;
  box-sizing: border-box;
}

.color-picker-wrapper:focus-within {
  border-color: var(--color-border-focus);
  box-shadow: var(--shadow-focus);
}

.color-picker {
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: none;
}

.color-picker::-webkit-color-swatch-wrapper { padding: 0; }
.color-picker::-webkit-color-swatch { border-radius: var(--radius-sm); border: none; }
.color-picker::-moz-color-swatch { border-radius: var(--radius-sm); border: none; }

.color-value {
  font-size: var(--text-sm);
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  font-weight: var(--font-medium);
}

/* Photo Upload */
.form-control-file-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.photo-dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-6) var(--space-4);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-subtle);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  text-align: center;
  color: var(--color-text-muted);
}

.photo-dropzone:hover,
.photo-dropzone.drag-over {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.photo-dropzone:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

.photo-dropzone-text {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
}

.photo-dropzone-hint {
  font-size: var(--text-xs);
  color: var(--color-text-light);
}

.photo-preview {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-muted);
  border-radius: var(--radius-md);
}

.photo-preview img {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.photo-preview-name {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.btn-remove-photo {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--color-error);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background-color var(--transition-fast);
}

.btn-remove-photo:hover {
  background: #dc2626;
}

/* Radio Group */
.radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.radio-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.radio-option:hover {
  border-color: var(--color-primary);
}

.radio-option:has(input:checked) {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.radio-option input[type="radio"] {
  margin-top: 3px;
  accent-color: var(--color-primary);
}

.radio-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.radio-label {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.radio-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* --------------------------------------------------
   Buttons
   -------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-lg);
  transition: background-color var(--transition-fast), color var(--transition-fast),
              box-shadow var(--transition-fast), transform var(--transition-fast),
              border-color var(--transition-fast);
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background-color: var(--color-primary);
  color: #fff;
  border: 2px solid transparent;
}

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

.btn-primary:disabled,
.btn-primary[aria-busy="true"] {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-generate {
  width: 100%;
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-base);
  border-radius: var(--radius-xl);
  margin-top: var(--space-2);
}

.btn-download {
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-bg);
  color: var(--color-text);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  transition: border-color var(--transition-fast), background-color var(--transition-fast),
              color var(--transition-fast);
}

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

.btn-download-recommended {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.badge-rec {
  display: inline-flex;
  align-items: center;
  padding: 1px var(--space-2);
  background-color: var(--color-primary);
  color: #fff;
  font-size: 10px;
  font-weight: var(--font-bold);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --------------------------------------------------
   Preview Panel
   -------------------------------------------------- */
.preview-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.preview-card {
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  text-align: center;
  transition: border-color var(--transition-normal);
  position: relative;
}

.preview-card:has(#preview-result:not([hidden])) {
  border-color: var(--color-primary);
}

.preview-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-light);
}

.preview-empty svg {
  opacity: 0.3;
}

.preview-empty p {
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
}

.preview-hint {
  font-size: var(--text-sm) !important;
  color: var(--color-text-light) !important;
  font-weight: var(--font-normal) !important;
}

/* Spinner */
.preview-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  color: var(--color-text-muted);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* QR Image */
.preview-result {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.qr-image {
  max-width: 280px;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.preview-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: italic;
}

/* Error */
.preview-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-error);
}

.preview-error p {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
}

/* Download Section */
.download-section {
  background-color: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
}

.download-heading {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-1);
}

.download-hint {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.download-sizes {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* --------------------------------------------------
   Ad Containers
   -------------------------------------------------- */
.ad-container {
  overflow: hidden;
  text-align: center;
}

.ad-leaderboard {
  min-height: 90px;
}

.ad-in-content {
  margin-top: var(--space-4);
  background-color: var(--color-bg-muted);
  border-radius: var(--radius-lg);
  min-height: 250px;
}

.ad-sidebar {
  display: flex;
  justify-content: center;
  margin-top: var(--space-2);
  min-height: 250px;
}

/* --------------------------------------------------
   Section Shared
   -------------------------------------------------- */
.section-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-extrabold);
  color: var(--color-text);
  text-align: center;
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  text-align: center;
  max-width: 600px;
  margin-inline: auto;
  margin-bottom: var(--space-10);
  line-height: var(--leading-relaxed);
}

/* --------------------------------------------------
   Features Section
   -------------------------------------------------- */
.features-section {
  padding: var(--space-16) 0;
  background-color: var(--color-bg-subtle);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.feature-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  transition: box-shadow var(--transition-normal), transform var(--transition-normal),
              border-color var(--transition-normal);
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
}

.feature-card h3 {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
}

.feature-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
}

/* --------------------------------------------------
   What is a QR Code Section
   -------------------------------------------------- */
.whatisqr-section {
  padding: var(--space-16) 0;
  background-color: var(--color-bg);
}

.whatisqr-content {
  max-width: 750px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
}

/* --------------------------------------------------
   Use Cases Section
   -------------------------------------------------- */
.usecases-section {
  padding: var(--space-16) 0;
  background-color: var(--color-bg-subtle);
}

/* --------------------------------------------------
   How-To Section
   -------------------------------------------------- */
.howto-section {
  padding: var(--space-16) 0;
  background-color: var(--color-bg);
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  max-width: 700px;
  margin-inline: auto;
}

.step {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background-color: var(--color-primary);
  color: #fff;
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.step-content h3 {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-2);
}

.step-content p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
}

/* --------------------------------------------------
   FAQ Section
   -------------------------------------------------- */
.faq-section {
  padding: var(--space-16) 0;
  background-color: var(--color-bg-subtle);
}

.faq-list {
  max-width: 750px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.faq-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--color-primary);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  user-select: none;
  -webkit-user-select: none;
  gap: var(--space-4);
  transition: color var(--transition-fast);
}

.faq-question::-webkit-details-marker { display: none; }
.faq-question::marker { display: none; }

.faq-question::after {
  content: '';
  display: inline-block;
  width: 20px;
  height: 20px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%234f46e5' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.faq-item[open] .faq-question::after {
  transform: rotate(180deg);
}

.faq-item[open] .faq-question {
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 var(--space-6) var(--space-5);
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
}

.faq-list-items {
  list-style: disc;
  padding-left: var(--space-6);
  margin: var(--space-3) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.faq-list-items li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
}

/* --------------------------------------------------
   Footer
   -------------------------------------------------- */
.site-footer {
  background-color: var(--color-text);
  color: #d1d5db;
  padding: var(--space-12) 0 var(--space-6);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: #fff;
  margin-bottom: var(--space-3);
  text-decoration: none;
}

.footer-logo:hover {
  color: var(--color-secondary);
  text-decoration: none;
}

.footer-tagline {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: #9ca3af;
}

.footer-nav h4 {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-nav a {
  font-size: var(--text-sm);
  color: #9ca3af;
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: #fff;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid #374151;
  padding-top: var(--space-6);
  text-align: center;
  font-size: var(--text-sm);
  color: #9ca3af;
}

.footer-bottom a {
  color: #d1d5db;
}

.footer-bottom a:hover {
  color: #fff;
}

/* --------------------------------------------------
   Responsive — 768px (Tablet)
   -------------------------------------------------- */
@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-6);
  }

  .nav-links {
    display: flex;
  }

  .hero h1 {
    font-size: var(--text-5xl);
  }

  .hero {
    padding: var(--space-20) 0 var(--space-16);
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }

  .steps-list {
    gap: var(--space-8);
  }
}

/* --------------------------------------------------
   Responsive — 1024px (Desktop)
   -------------------------------------------------- */
@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-8);
  }

  .generator-layout {
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: var(--space-10);
    align-items: start;
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .usecases-section .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --------------------------------------------------
   Responsive — 1200px (Wide)
   -------------------------------------------------- */
@media (min-width: 1200px) {
  .generator-layout {
    grid-template-columns: 1fr 460px;
    gap: var(--space-12);
  }

  .hero h1 {
    font-size: 3.5rem;
  }
}

/* --------------------------------------------------
   Print Styles
   -------------------------------------------------- */
@media print {
  .site-header,
  .hero,
  .form-panel,
  .features-section,
  .howto-section,
  .faq-section,
  .site-footer,
  .ad-container,
  .download-section,
  .btn {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .preview-panel {
    display: flex;
    justify-content: center;
  }

  .preview-card {
    border: none;
    box-shadow: none;
    padding: 0;
  }

  .qr-image {
    max-width: 400px;
    width: 100%;
  }
}

/* --------------------------------------------------
   Privacy Policy Page
   -------------------------------------------------- */
.privacy-section {
  padding: var(--spacing-16) 0;
}

.privacy-updated {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--spacing-8);
}

.privacy-content {
  max-width: 48rem;
}

.privacy-content h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-top: var(--spacing-8);
  margin-bottom: var(--spacing-3);
  color: var(--color-text);
}

.privacy-content h3 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-top: var(--spacing-4);
  margin-bottom: var(--spacing-2);
  color: var(--color-text);
}

.privacy-content p,
.privacy-content ul,
.privacy-content li {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-muted);
}

.privacy-content ul {
  padding-left: var(--spacing-6);
  margin-bottom: var(--spacing-4);
}

.privacy-content li {
  margin-bottom: var(--spacing-2);
}

.privacy-content a {
  color: var(--color-primary);
  text-decoration: underline;
}

.privacy-content a:hover {
  color: var(--color-primary-hover);
}

.privacy-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-3) 0 var(--spacing-6);
  font-size: var(--text-sm);
}

.privacy-table th,
.privacy-table td {
  text-align: left;
  padding: var(--spacing-2) var(--spacing-3);
  border-bottom: 1px solid var(--color-border);
}

.privacy-table th {
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-bg-subtle);
}

.privacy-table td {
  color: var(--color-text-muted);
}

/* --------------------------------------------------
   Cookie Consent Banner
   -------------------------------------------------- */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--color-text);
  color: #d1d5db;
  padding: var(--space-5) var(--space-4);
  box-shadow: 0 -4px 12px rgb(0 0 0 / 0.15);
}

.cookie-banner-content {
  max-width: var(--container-max);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.cookie-banner-text {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  flex: 1;
}

.cookie-banner-link {
  color: #fff;
  text-decoration: underline;
}

.cookie-banner-link:hover {
  color: var(--color-secondary);
}

.cookie-banner-actions {
  display: flex;
  gap: var(--space-3);
  flex-shrink: 0;
}

.btn-cookie-accept,
.btn-cookie-decline {
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-lg);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.btn-cookie-accept {
  background-color: #fff;
  color: var(--color-text);
  border: 2px solid #fff;
}

.btn-cookie-accept:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary-light);
}

.btn-cookie-decline {
  background-color: transparent;
  color: #d1d5db;
  border: 2px solid #6b7280;
}

.btn-cookie-decline:hover {
  background-color: #374151;
  border-color: #9ca3af;
  color: #fff;
}

@media (max-width: 640px) {
  .cookie-banner-content {
    flex-direction: column;
    text-align: center;
  }

  .cookie-banner-actions {
    width: 100%;
    justify-content: center;
  }

  .btn-cookie-accept,
  .btn-cookie-decline {
    flex: 1;
  }
}

/* --------------------------------------------------
   Accessibility — Reduced Motion
   -------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}