/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* CSS Variables for Light / Dark Mode */
:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #f8fafc;
  --surface-color: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border-color: #e2e8f0;
  --danger-color: #ef4444;
  --success-color: #22c55e;
  --dropzone-bg: #eff6ff;
  --dropzone-border: #93c5fd;
  --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);
  --transition: all 0.3s ease;
  --ad-bg: #e5e7eb;
}

[data-theme="dark"] {
  --primary-color: #3b82f6;
  --primary-hover: #60a5fa;
  --bg-color: #0f172a;
  --surface-color: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --border-color: #334155;
  --dropzone-bg: #1e293b;
  --dropzone-border: #475569;
  --ad-bg: #1e293b;
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

/* Typography elements */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

/* Layout Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* Header & Navigation */
.header {
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo:hover {
  text-decoration: none;
}

.nav-menu {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  color: var(--text-primary);
  font-weight: 500;
  text-transform: capitalize;
}

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

.theme-toggle {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 1.25rem;
  padding: 0.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle:hover {
  background-color: var(--border-color);
}

/* Main Content Area */
main {
  flex: 1;
  padding: 3rem 0;
}

/* Page Headers */
.page-header {
  text-align: center;
  margin-bottom: 3rem;
}

.page-header h1 {
  font-size: 2.5rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.page-header p {
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  font-size: 1rem;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--surface-color);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--border-color);
  text-decoration: none;
}

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

.btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* Tool Interface Section */
.tool-section {
  background-color: var(--surface-color);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 3rem;
  border: 1px solid var(--border-color);
}

.dropzone {
  border: 2px dashed var(--dropzone-border);
  background-color: var(--dropzone-bg);
  border-radius: 12px;
  padding: 3rem 2rem;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  margin-bottom: 1.5rem;
}

.dropzone.dragover {
  border-color: var(--primary-color);
  background-color: var(--primary-color);
  opacity: 0.1;
}

.dropzone-icon {
  font-size: 3rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.dropzone-text {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.dropzone-hint {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

#fileInput {
  display: none;
}

/* Processing Indicator */
.processing-indicator {
  display: none;
  text-align: center;
  padding: 2rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.progress-bar-container {
  width: 100%;
  height: 8px;
  background-color: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 1rem;
  display: none;
}

.progress-bar {
  height: 100%;
  background-color: var(--primary-color);
  width: 0%;
  transition: width 0.3s ease;
}

/* Result Section */
.result-section {
  display: none;
  margin-top: 2rem;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 2rem;
}

.image-preview-container {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 250px;
}

.image-preview {
  max-width: 100%;
  max-height: 300px;
  object-fit: contain;
  margin-bottom: 1rem;
}

.result-stats {
  width: 100%;
  display: flex;
  justify-content: space-around;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.875rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.stat-value {
  font-weight: 600;
  color: var(--text-primary);
}

.text-output-container {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.text-output {
  width: 100%;
  height: 100%;
  min-height: 250px;
  padding: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  resize: vertical;
  margin-bottom: 1rem;
}

.text-output:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.output-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}

/* Content Sections (SEO Content) */
.content-section {
  background-color: var(--surface-color);
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
  border: 1px solid var(--border-color);
}

.content-section h2 {
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
  border-bottom: 2px solid var(--bg-color);
  padding-bottom: 0.5rem;
}

.content-section h3 {
  font-size: 1.3rem;
  margin-top: 1.5rem;
}

.content-section ul {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

/* FAQ Section */
.faq-item {
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  color: var(--text-secondary);
  margin-top: 0.5rem;
  display: none;
}

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

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-weight: 500;
  color: var(--text-primary);
}

.form-input, .form-textarea {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: var(--transition);
}

.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}


/* Footer */
.footer {
  background-color: var(--surface-color);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  margin-top: auto;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-col h4 {
  font-size: 1.125rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a {
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Responsive Styles */
@media (max-width: 768px) {
  .result-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-menu {
    display: none; /* Mobile menu can be toggled via JS if needed, but keeping simple for now */
  }
  
  .page-header h1 {
    font-size: 2rem;
  }
  
  .tool-section, .content-section {
    padding: 1.5rem;
  }
  
  .dropzone {
    padding: 2rem 1rem;
  }
}