:root {
  --primary-blue: #2563eb;
  --light-blue: #eff6ff;
  --dark-blue: #1e40af;
  --white: #ffffff;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-600: #4b5563;
  --gray-800: #1f2937;
  --success-green: #10b981;
  --error-red: #ef4444;
  --warning-yellow: #f59e0b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--gray-100);
  color: var(--gray-800);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header Styles */
.header {
  background: linear-gradient(135deg, var(--primary-blue), var(--dark-blue));
  color: var(--white);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

.logo h1 {
  margin: 0;
  font-size: 1.8rem;
  font-weight: 700;
}

.logo .tagline {
  font-size: 0.9rem;
  opacity: 0.9;
  font-weight: 300;
}

.nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav__menu {
  list-style: none;
  display: flex;
  gap: 0.5rem;
  padding: 0;
  margin: 0;
}

.nav__link {
  color: var(--white);
  text-decoration: none;
  padding: 0.75rem 1rem;
  display: block;
  font-weight: 500;
  border-radius: 6px;
  transition: all 0.3s ease;
}

.nav__link:hover,
.nav__link.active {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.nav__toggle {
  display: none;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--white);
  cursor: pointer;
  padding: 0.5rem;
}

/* Main Layout */
.main-layout {
  display: grid;
  grid-template-columns: 320px 1fr 180px;
  gap: 1.5rem;
  margin: 1.5rem auto;
  align-items: start;
}

.ad-sidebar {
  background: var(--white);
  border: 2px dashed var(--primary-blue);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 650px;
  position: sticky;
  top: 120px;
}

.ad-sidebar--left {
  grid-column: 1;
}

.ad-sidebar--right {
  grid-column: 3;
}

.main {
  grid-column: 2;
  background: var(--white);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.05), 0 1px 3px rgba(0,0,0,0.1);
  min-height: 70vh;
}

/* Page Management */
.page {
  display: none;
}

.page.active {
  display: block;
  animation: fadeIn 0.3s ease-in;
}

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

/* Form Elements */
textarea {
  width: 100%;
  min-height: 200px;
  margin: 1rem 0;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9rem;
  resize: vertical;
  padding: 1rem;
  border: 2px solid var(--gray-300);
  border-radius: 8px;
  background: var(--gray-100);
  transition: border-color 0.3s ease;
}

textarea:focus {
  outline: none;
  border-color: var(--primary-blue);
  background: var(--white);
}

button {
  cursor: pointer;
  margin: 0.5rem 0.5rem 0.5rem 0;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 6px;
  background: var(--primary-blue);
  color: var(--white);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.3);
}

button:hover {
  background: var(--dark-blue);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(37, 99, 235, 0.4);
}

button:active {
  transform: translateY(0);
}

/* Button Container for Centered Positioning */
.button-container {
  display: flex;
  justify-content: center;
  margin-top: 0.5rem;
}

.button-container button {
  margin: 0;
}

/* Button Row for other pages */
.button-row {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  align-items: center;
}

/* Converter Layouts */
.converter-controls {
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.converter-controls label {
  font-weight: 600;
  color: var(--gray-600);
}

.converter-controls select {
  padding: 0.5rem;
  font-size: 1rem;
  border: 2px solid var(--gray-300);
  border-radius: 6px;
  background: var(--white);
}

.converter-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 1rem 0;
}

.input-section,
.output-section {
  display: flex;
  flex-direction: column;
}

.input-section label,
.output-section label {
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--gray-600);
}

/* Results and Tree Container */
.results-container {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--gray-100);
  border-radius: 8px;
  border-left: 4px solid var(--primary-blue);
  font-family: monospace;
  white-space: pre-wrap;
}

.results-container.error {
  border-left-color: var(--error-red);
  background: #fef2f2;
  color: var(--error-red);
}

.results-container.success {
  border-left-color: var(--success-green);
  background: #f0fdf4;
  color: var(--success-green);
}

/* UPDATED: Full-width Path Display for Prettifier */
.path-display-full {
  width: 100%;
  background: var(--gray-200);
  padding: 1rem;
  border-radius: 8px;
  font-family: monospace;
  font-weight: 600;
  color: var(--primary-blue);
  overflow-x: auto;
  white-space: nowrap;
  margin: 1rem 0;
  min-height: 3rem;
  display: flex;
  align-items: center;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 2px solid var(--gray-300);
  user-select: all; /* Allow text selection for copying */
}

.path-display-full:hover {
  border-color: var(--primary-blue);
  background: var(--light-blue);
}

.path-display-full.clicked {
  background: var(--primary-blue);
  color: var(--white);
}

/* Path Tooltip */
.path-tooltip {
  position: absolute;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: normal;
  white-space: nowrap;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  pointer-events: none;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.path-tooltip.show {
  opacity: 1;
  visibility: visible;
}

/* Original Path Container (not used in prettifier anymore) */
.path-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1rem 0;
}

.path-display {
  background: var(--gray-200);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-family: monospace;
  font-weight: 600;
  color: var(--primary-blue);
  flex: 1;
  overflow-x: auto;
  white-space: nowrap;
  max-width: 500px;
  min-height: 2.5rem;
  display: flex;
  align-items: center;
}

.copy-path-button {
  background: var(--gray-300);
  color: var(--gray-600);
  border: none;
  border-radius: 4px;
  padding: 0.5rem;
  font-size: 0.8rem;
  cursor: pointer;
  margin: 0;
  box-shadow: none;
  min-width: 2.5rem;
  height: 2.5rem;
  transition: all 0.2s ease;
}

.copy-path-button:hover {
  background: var(--primary-blue);
  color: var(--white);
  transform: none;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.3);
}

.tree-container {
  background: var(--white);
  border: 2px solid var(--gray-300);
  border-radius: 8px;
  padding: 1rem;
  margin: 1rem 0;
  font-family: monospace;
  max-height: 500px;
  overflow-y: auto;
}

.tree-node {
  margin: 0.25rem 0;
  padding: 0.25rem 0;
}

.tree-node-toggle {
  background: none;
  border: none;
  color: var(--primary-blue);
  cursor: pointer;
  font-size: 0.8rem;
  padding: 0 0.5rem 0 0;
  margin: 0;
  box-shadow: none;
}

.tree-node-toggle:hover {
  background: none;
  transform: none;
  box-shadow: none;
  color: var(--dark-blue);
}

.tree-node-content {
  display: inline;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  transition: background-color 0.2s ease;
}

.tree-node-content:hover {
  background-color: var(--light-blue);
}

.tree-node-content.selected {
  background-color: var(--primary-blue);
  color: var(--white);
}

.tree-node-children {
  margin-left: 1.5rem;
  border-left: 1px solid var(--gray-300);
  padding-left: 1rem;
}

.tree-node-children.collapsed {
  display: none;
}

/* Example Comparison */
.example-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

.example-block {
  background: var(--gray-100);
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid var(--gray-300);
}

.example-block h4 {
  margin-top: 0;
  color: var(--primary-blue);
}

.example-block pre {
  background: var(--gray-800);
  color: var(--white);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.85rem;
}

/* Ad Banners */
.ad-banner {
  width: 100%;
  text-align: center;
  padding: 1.5rem;
  border: 2px dashed var(--primary-blue);
  background: var(--light-blue);
  font-weight: 600;
  color: var(--primary-blue);
  margin: 1rem 0;
  border-radius: 8px;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ad-banner--top {
  margin-top: 0;
}

.ad-banner--bottom {
  margin-bottom: 0;
}

.ad-placeholder {
  font-size: 1.1rem;
}

/* Footer */
.footer {
  background: var(--gray-800);
  color: var(--white);
  text-align: center;
  padding: 2rem 0;
  margin-top: 3rem;
}

.footer button {
  background: var(--primary-blue);
  margin-bottom: 1rem;
}

/* Mobile Responsive */
@media (max-width: 1024px) {
  .main-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .ad-sidebar--left, 
  .ad-sidebar--right {
    display: none;
  }
  
  .converter-layout {
    grid-template-columns: 1fr;
  }
  
  .example-comparison {
    grid-template-columns: 1fr;
  }

  .button-row {
    flex-direction: column;
    align-items: stretch;
  }

  .button-row button {
    margin: 0.25rem 0;
  }
}

@media (max-width: 768px) {
  .nav__toggle {
    display: block;
  }
  
  .nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--primary-blue);
    flex-direction: column;
    padding: 1rem;
    margin: 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border-radius: 0 0 8px 8px;
    z-index: 200;
  }
  
  .nav__menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav__link {
    padding: 1rem;
    border-radius: 6px;
    margin: 0.25rem 0;
  }
  
  .main {
    padding: 1rem;
  }
  
  .converter-controls {
    flex-direction: column;
    align-items: stretch;
  }
  
  .header__content {
    position: relative;
  }
  
  .nav {
    position: relative;
  }
}