/* Global box sizing and variables */
:root {
  --primary-color: #10B981;
  --primary-hover: #059669;
  --secondary-color: #3b82f6;
  --secondary-hover: #2563eb;
  --background-color: #ffffff;
  --card-background: #ffffff;
  --text-primary: #1F2937;
  --text-secondary: #6B7280;
  --success-color: #10b981;
  --error-color: #ef4444;
  --border-color: #E5E7EB;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --container-width: 640px;
  --border-radius: 0.5rem;
}

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

/* Reset html and body for full height and flex layout */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--background-color);
  color: var(--text-primary);
  line-height: 1.5;
}

body {
  display: flex;
  flex-direction: column;
}

/* Header styling */
header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  padding: 1.5rem 1rem;
  color: white;
  text-align: center;
  box-shadow: var(--shadow-md);
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  letter-spacing: -0.025em;
}

header .tagline {
  font-size: 1.125rem;
  margin: 0.25rem 0;
  opacity: 0.9;
}

header .description {
  font-size: 0.875rem;
  margin: 0.75rem auto;
  max-width: 500px;
  opacity: 0.8;
  line-height: 1.5;
}

/* Main container */
.container {
  width: 90%;
  max-width: var(--container-width);
  margin: 1.5rem auto;
  flex: 1;
}

/* Tab Navigation */
.tab-nav {
  display: flex;
  width: 100%;
  margin-bottom: 1rem;
  background: var(--card-background);
  border-radius: var(--border-radius);
  padding: 0.25rem;
  box-shadow: var(--shadow-sm);
}

.tab-btn {
  flex: 1;
  padding: 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  text-align: center;
  background: transparent;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  border-radius: calc(var(--border-radius) - 0.125rem);
}

.tab-btn.active {
  background: var(--primary-color);
  color: white;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

/* Card styling */
.card {
  background: var(--card-background);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  transition: transform 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
}

/* Form styling */
.form-group {
  margin-bottom: 1rem;
}

form label {
  display: block;
  margin-bottom: 0.375rem;
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.875rem;
}

form input[type="text"],
form textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  transition: all 0.2s ease;
  background: var(--background-color);
}

form input[type="text"]:focus,
form textarea:focus {
  border-color: var(--primary-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* Button styles */
.btn {
  display: inline-block;
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
  transition: all 0.2s ease;
}

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

.primary-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

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

.secondary-btn:hover {
  background: var(--secondary-hover);
  transform: translateY(-1px);
}

/* Alert messages */
.alert {
  padding: 1rem;
  margin-bottom: 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
}

.alert.success {
  background-color: #dcfce7;
  color: var(--success-color);
  border: 1px solid #bbf7d0;
}

.alert.error {
  background-color: #fee2e2;
  color: var(--error-color);
  border: 1px solid #fecaca;
}

.alert.info {
  background-color: #dbeafe;
  color: var(--secondary-color);
  border: 1px solid #bfdbfe;
}

/* Generated info styling */
.generated-info {
  text-align: center;
  padding: 0.75rem;
}

.generated-info p {
  margin: 0.75rem 0;
  font-size: 0.875rem;
}

.qr-container {
  margin: 1rem auto;
  padding: 0.75rem;
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  display: inline-block;
}

.qr-container img {
  width: 160px;
  height: 160px;
}

.link-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
}

.link-container input[type="text"] {
  width: 100%;
  max-width: 360px;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 0.875rem;
  text-align: center;
  background: var(--background-color);
}

.copy-link-btn {
  background: var(--text-primary);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.copy-link-btn:hover {
  background: var(--text-secondary);
  transform: translateY(-1px);
}

/* Text display area */
.result-text {
  background: var(--card-background);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.text-header {
  background: var(--background-color);
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.text-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.text-header h2 i {
  color: var(--primary-color);
  font-size: 1.25rem;
}

.text-actions {
  display: flex;
  gap: 0.5rem;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 0.75rem;
  background: var(--card-background);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.action-btn i {
  font-size: 1rem;
}

.text-container {
  padding: 1.25rem;
  position: relative;
}

.text-display {
  width: 100%;       /* stretch across the card */
  max-height: 60vh;  /* occupy up to 60% of viewport height */
  min-height: 150px;
  overflow: auto;    /* internal scroll */
  white-space: pre-wrap;
}

.text-display:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.text-display::-webkit-scrollbar {
  width: 8px;
}

.text-display::-webkit-scrollbar-track {
  background: transparent;
}

.text-display::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: 4px;
}

.text-info {
  display: flex;
  gap: 1rem;
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: var(--background-color);
  border-radius: var(--border-radius);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.text-length, .text-lines {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.text-length::before {
  content: '📝';
}

.text-lines::before {
  content: '📊';
}

/* FAQ Section */
.faq-section {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--card-background);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
}

.faq-section h3 {
  text-align: center;
  margin-bottom: 1.5rem;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.faq {
  display: grid;
  gap: 0.75rem;
}

.faq-item {
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: all 0.2s ease;
}

.faq-item:hover {
  box-shadow: var(--shadow-md);
}

.faq-question {
  padding: 0.75rem 1rem;
  background: var(--background-color);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
  font-size: 0.875rem;
}

.faq-toggle {
  font-size: 1.25rem;
  transition: transform 0.2s ease;
  color: var(--text-secondary);
}

.faq-answer {
  padding: 0.75rem 1rem;
  background: white;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: none;
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.faq-item.active .faq-answer {
  display: block;
}

/* Footer */
footer {
  text-align: center;
  padding: 1.5rem;
  background: var(--card-background);
  color: var(--text-secondary);
  box-shadow: var(--shadow-md);
  font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --container-width: 100%;
  }
  
  header h1 {
    font-size: 1.75rem;
  }
  
  .container {
    width: 95%;
    margin: 1rem auto;
  }
  
  .card {
    padding: 1.25rem;
  }
  
  .qr-container img {
    width: 140px;
    height: 140px;
  }
}

@media (max-width: 480px) {
  header {
    padding: 1.25rem 1rem;
  }
  
  header h1 {
    font-size: 1.5rem;
  }
  
  .tab-nav {
    flex-direction: row;
  }
  
  .tab-btn {
    width: 50%;
  }
  
  .link-container input[type="text"] {
    font-size: 0.75rem;
  }
  
  .faq-section {
    padding: 1rem;
  }
  
  .result-text h2 {
    font-size: 1rem;
  }
  
  .text-header {
    flex-direction: column;
    gap: 0.75rem;
    align-items: flex-start;
  }
  
  .text-actions {
    width: 100%;
    justify-content: space-between;
  }
  
  .action-btn {
    flex: 1;
    justify-content: center;
  }
  
  .text-info {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .text-display {
    min-height: 120px;
  }
}

/* Message alerts */
.message {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    z-index: 1000;
    animation: slideIn 0.3s ease-out;
    box-shadow: var(--shadow-lg);
    background-color: #3B82F6;
    color: white;
}

.message.error {
    background-color: #EF4444;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

/* Update all primary color references */
.btn-primary {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

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

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

.text-header h2 i {
    color: var(--primary-color);
    font-size: 1.25rem;
}

.text-display:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}