/* ================================
   MODERN QR GENERATOR CSS
   ================================ */

/* CSS Custom Properties (Design System) */
:root {
  /* Colors */
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --secondary: #8b5cf6;
  --accent: #f59e0b;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --info: #06b6d4;

  /* Grays */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;

  /* Fonts */
  --font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;

  /* Font Sizes */
  --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;

  /* 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;

  /* Borders */
  --radius-sm: 0.375rem;
  --radius: 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: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --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-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* Base Styles */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--gray-800);
  background-color: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 {
  font-size: var(--text-4xl);
}
h2 {
  font-size: var(--text-3xl);
}
h3 {
  font-size: var(--text-2xl);
}
h4 {
  font-size: var(--text-xl);
}
h5 {
  font-size: var(--text-lg);
}
h6 {
  font-size: var(--text-base);
}

p {
  margin-bottom: 1rem;
}

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

a:hover {
  color: var(--primary-dark);
}

/* Modern Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: var(--transition);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  border: none;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-dark), #7c3aed);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
  color: white;
}

.btn-secondary {
  background: var(--gray-100);
  color: var(--gray-700);
  border-color: var(--gray-200);
}

.btn-secondary:hover {
  background: var(--gray-200);
  color: var(--gray-800);
}

.btn-outline-primary {
  background: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

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

.btn-success {
  background: var(--success);
  color: white;
}

.btn-success:hover {
  background: #059669;
  color: white;
}

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
  color: white;
}

.btn-warning {
  background: var(--warning);
  color: white;
}

.btn-warning:hover {
  background: #d97706;
  color: white;
}

.btn-info {
  background: var(--info);
  color: white;
}

.btn-info:hover {
  background: #0891b2;
  color: white;
}

/* Modern Cards */
.card {
  background: white;
  border-radius: var(--radius-xl);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

.hover-lift {
  transition: var(--transition);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card-header {
  padding: var(--space-6) var(--space-6) var(--space-4);
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
  font-weight: 600;
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-4) var(--space-6);
  background: var(--gray-50);
  border-top: 1px solid var(--gray-200);
}

/* Glass Effect */
.glass {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Modern Forms */
.form-control {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  transition: var(--transition);
  background: white;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgb(99 102 241 / 0.1);
}

.form-label {
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: var(--space-2);
  display: block;
}

.form-select {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  background: white;
  cursor: pointer;
}

.form-check-input {
  margin-right: var(--space-2);
}

/* Input Groups */
.input-group {
  position: relative;
  display: flex;
  align-items: stretch;
}

.input-group .form-control {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  flex: 1;
}

.input-group .btn {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

.input-group-text {
  padding: var(--space-3) var(--space-4);
  background: var(--gray-100);
  border: 1px solid var(--gray-300);
  border-right: none;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  color: var(--gray-600);
}

/* Size Selector */
.size-selector {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.form-range {
  flex: 1;
  height: 6px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  outline: none;
  -webkit-appearance: none;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--primary);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.form-range::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

.size-display {
  min-width: 60px;
  padding: var(--space-1) var(--space-3);
  background: var(--primary);
  color: white;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  text-align: center;
}

/* QR Code Container */
.qr-code-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-8);
  background: var(--gray-50);
  border-radius: var(--radius-xl);
  border: 2px dashed var(--gray-300);
}

.qr-code-container canvas,
.qr-code-container img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

/* Button Groups */
.btn-group-custom {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-4);
}

.btn-group-custom .btn {
  flex: 1;
  min-width: 120px;
}

/* Modern Alerts */
.alert {
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-xl);
  border: none;
  margin-bottom: var(--space-4);
}

.alert-success {
  background: linear-gradient(135deg, #ecfdf5, #d1fae5);
  color: #065f46;
  border-left: 4px solid var(--success);
}

.alert-danger {
  background: linear-gradient(135deg, #fef2f2, #fecaca);
  color: #991b1b;
  border-left: 4px solid var(--danger);
}

.alert-warning {
  background: linear-gradient(135deg, #fffbeb, #fed7aa);
  color: #92400e;
  border-left: 4px solid var(--warning);
}

.alert-info {
  background: linear-gradient(135deg, #f0f9ff, #bae6fd);
  color: #0c4a6e;
  border-left: 4px solid var(--info);
}

/* Statistics Cards */
.stat-card {
  background: white;
  padding: var(--space-8) var(--space-6);
  border-radius: var(--radius-xl);
  text-align: center;
  border: 1px solid var(--gray-200);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.stat-card i {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: var(--space-4);
  display: block;
}

.stat-card h3 {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: var(--space-2);
}

.stat-card p {
  color: var(--gray-600);
  margin: 0;
  font-weight: 500;
}

/* Loading Spinner */
.spinner-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.9);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  backdrop-filter: blur(5px);
}

.spinner-wrapper.show {
  display: flex;
}

/* Gradient Text */
.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
}

/* Modern Navigation Tabs */
.nav-tabs {
  border-bottom: 2px solid var(--gray-200);
  gap: var(--space-2);
}

.nav-tabs .nav-link {
  border: none;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: var(--space-3) var(--space-6);
  font-weight: 600;
  color: var(--gray-600);
  background: transparent;
  transition: var(--transition);
  position: relative;
}

.nav-tabs .nav-link:hover {
  color: var(--primary);
  background: var(--gray-50);
}

.nav-tabs .nav-link.active {
  color: var(--primary);
  background: white;
  border-bottom: 2px solid var(--primary);
}

.nav-tabs .nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
}

/* Tab Content */
.tab-content {
  margin-top: var(--space-6);
}

.tab-pane {
  opacity: 0;
  transition: opacity var(--transition);
}

.tab-pane.active {
  opacity: 1;
}

/* Modern Tables */
.table {
  width: 100%;
  margin-bottom: 0;
  border-collapse: separate;
  border-spacing: 0;
}

.table thead th {
  background: var(--gray-50);
  color: var(--gray-700);
  font-weight: 600;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--gray-200);
}

.table tbody td {
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--gray-200);
  vertical-align: middle;
}

.table tbody tr:hover {
  background: var(--gray-50);
}

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

/* Badges */
.badge {
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
}

.bg-primary {
  background: var(--primary) !important;
}
.bg-success {
  background: var(--success) !important;
}
.bg-danger {
  background: var(--danger) !important;
}
.bg-warning {
  background: var(--warning) !important;
}
.bg-info {
  background: var(--info) !important;
}
.bg-light {
  background: var(--gray-100) !important;
  color: var(--gray-700) !important;
}
.bg-dark {
  background: var(--gray-800) !important;
}

/* Text Colors */
.text-primary {
  color: var(--primary) !important;
}
.text-success {
  color: var(--success) !important;
}
.text-danger {
  color: var(--danger) !important;
}
.text-warning {
  color: var(--warning) !important;
}
.text-info {
  color: var(--info) !important;
}
.text-muted {
  color: var(--gray-500) !important;
}
.text-light {
  color: var(--gray-300) !important;
}
.text-dark {
  color: var(--gray-800) !important;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.fade-in-up {
  animation: fadeInUp 0.8s ease-out;
}

.fade-in-down {
  animation: fadeInDown 0.8s ease-out;
}

.fade-in-left {
  animation: fadeInLeft 0.8s ease-out;
}

.fade-in-right {
  animation: fadeInRight 0.8s ease-out;
}

/* Utility Classes */
.text-center {
  text-align: center;
}
.text-left {
  text-align: left;
}
.text-right {
  text-align: right;
}

.d-none {
  display: none;
}
.d-block {
  display: block;
}
.d-flex {
  display: flex;
}
.d-inline-flex {
  display: inline-flex;
}

.justify-content-center {
  justify-content: center;
}
.justify-content-between {
  justify-content: space-between;
}
.align-items-center {
  align-items: center;
}

.mt-1 {
  margin-top: var(--space-1);
}
.mt-2 {
  margin-top: var(--space-2);
}
.mt-3 {
  margin-top: var(--space-3);
}
.mt-4 {
  margin-top: var(--space-4);
}
.mt-5 {
  margin-top: var(--space-5);
}

.mb-1 {
  margin-bottom: var(--space-1);
}
.mb-2 {
  margin-bottom: var(--space-2);
}
.mb-3 {
  margin-bottom: var(--space-3);
}
.mb-4 {
  margin-bottom: var(--space-4);
}
.mb-5 {
  margin-bottom: var(--space-5);
}

.p-1 {
  padding: var(--space-1);
}
.p-2 {
  padding: var(--space-2);
}
.p-3 {
  padding: var(--space-3);
}
.p-4 {
  padding: var(--space-4);
}
.p-5 {
  padding: var(--space-5);
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  :root {
    --gray-50: #18181b;
    --gray-100: #27272a;
    --gray-200: #3f3f46;
    --gray-300: #52525b;
    --gray-400: #71717a;
    --gray-500: #a1a1aa;
    --gray-600: #d4d4d8;
    --gray-700: #e4e4e7;
    --gray-800: #f4f4f5;
    --gray-900: #fafafa;
  }

  body {
    background-color: var(--gray-50);
    color: var(--gray-800);
  }

  .card {
    background: var(--gray-100);
    border-color: var(--gray-200);
  }

  .form-control {
    background: var(--gray-100);
    border-color: var(--gray-200);
    color: var(--gray-800);
  }

  .form-control:focus {
    background: var(--gray-100);
    color: var(--gray-800);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .btn-group-custom {
    flex-direction: column;
  }

  .btn-group-custom .btn {
    width: 100%;
  }

  .stat-card {
    padding: var(--space-6) var(--space-4);
  }

  .stat-card i {
    font-size: 2rem;
  }

  .stat-card h3 {
    font-size: var(--text-2xl);
  }
}

@media (max-width: 576px) {
  .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .card-body {
    padding: var(--space-4);
  }

  .btn-lg {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-sm);
  }
}

/* Enhanced QR Code Display - Add to your style.css */

/* QR Container - Responsive Sizing */
.qr-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  background: #f8fafc;
  border-radius: 12px;
  border: 2px dashed #cbd5e1;
  min-height: 200px; /* Minimum height for small QR codes */
  max-width: 100%;
  overflow: hidden; /* Prevent overflow */
}

/* QR Code Elements - Responsive */
#qrcode {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  max-width: 100%;
}

#qrcode canvas,
#qrcode img {
  max-width: 100% !important;
  max-height: 100% !important;
  height: auto !important;
  width: auto !important;
  object-fit: contain; /* Maintain aspect ratio */
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* QR Display Container */
.qr-display {
  text-align: center;
  margin-bottom: 24px;
  width: 100%;
}

/* Responsive QR Sizes */
@media (max-width: 768px) {
  .qr-container {
    padding: 15px;
    min-height: 150px;
  }

  #qrcode canvas,
  #qrcode img {
    max-width: 280px !important;
    max-height: 280px !important;
  }
}

@media (max-width: 480px) {
  .qr-container {
    padding: 10px;
    min-height: 120px;
  }

  #qrcode canvas,
  #qrcode img {
    max-width: 200px !important;
    max-height: 200px !important;
  }
}

/* Large QR Codes - Desktop */
@media (min-width: 1200px) {
  #qrcode canvas,
  #qrcode img {
    max-width: 400px !important;
    max-height: 400px !important;
  }
}

/* QR Result Card Responsive */
.qr-result-card {
  background: white;
  border-radius: 16px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  max-width: 100%;
}

.result-content {
  padding: 32px 24px;
  overflow: hidden; /* Prevent content overflow */
}

/* Ensure QR code scales properly within its container */
.qr-size-wrapper {
  position: relative;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Loading state improvements */
.qr-loading {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
  flex-direction: column;
  gap: 16px;
}

.qr-loading .spinner-border {
  width: 3rem;
  height: 3rem;
  border-width: 0.3em;
}

/* Preview container sticky positioning fix */
.qr-preview-container {
  position: sticky;
  top: 100px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

/* Improved placeholder responsive design */
.qr-placeholder-card {
  background: white;
  border-radius: 16px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
  padding: 40px 24px;
  text-align: center;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

@media (max-width: 768px) {
  .qr-placeholder-card {
    padding: 30px 20px;
    min-height: 250px;
  }

  .placeholder-features {
    flex-direction: column;
    gap: 16px;
    align-items: center;
  }

  .feature {
    flex-direction: row;
    gap: 12px;
  }
}