/* ====================
   CSS Variables & Theme
   ==================== */

:root {
  /* Light theme colors */
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-secondary: #8b5cf6;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-info: #06b6d4;
  --color-accent: #ec4899;
  --color-error: #ef4444;

  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-alt: #f1f5f9;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-border: #e2e8f0;
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-overlay: rgba(0, 0, 0, 0.5);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;

  /* Z-index layers */
  --z-dropdown: 50;
  --z-sticky: 100;
  --z-modal: 1000;
  --z-toast: 1100;
}

/* Dark theme */
[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-surface-alt: #334155;
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-border: #334155;
  --color-shadow: rgba(0, 0, 0, 0.4);
  --color-overlay: rgba(0, 0, 0, 0.7);
}

/* ====================
   Reset & Base Styles
   ==================== */

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

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

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

/* ====================
   Navigation Bar
   ==================== */

.navbar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 1px 3px var(--color-shadow);
  transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
  background: rgba(30, 41, 59, 0.9);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  font-size: var(--font-size-lg);
}

.brand-icon {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: var(--font-size-xl);
}

.brand-name {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Navigation Menu */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex: 1;
  justify-content: center;
}

.nav-item {
  position: relative;
}

.nav-link {
  background: transparent;
  border: none;
  color: var(--color-text);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-link:hover {
  background: var(--color-surface-alt);
  color: var(--color-primary);
}

/* Dropdown Menu */
.dropdown-content {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  min-width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px var(--color-shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  z-index: var(--z-dropdown);
}

.dropdown:hover .dropdown-content {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast);
  font-size: var(--font-size-sm);
}

.dropdown-item:hover {
  background: var(--color-surface-alt);
  color: var(--color-primary);
}

.dropdown-item.coming-soon {
  opacity: 0.5;
  cursor: not-allowed;
}

.dropdown-divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--spacing-xs) 0;
}

.theme-toggle {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: all var(--transition-fast);
  font-size: var(--font-size-lg);
}

.theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px var(--color-shadow);
}

.theme-icon {
  transition: opacity var(--transition-fast);
}

[data-theme="light"] .dark-icon,
[data-theme="dark"] .light-icon {
  display: none;
}

/* Hamburger Menu */
.hamburger-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  z-index: 1001;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

/* Show hamburger on mobile */
@media (max-width: 1024px) {
  .hamburger-btn {
    display: flex;
  }
}

.hamburger-btn:hover {
  background: var(--color-surface-alt);
}

/* Hamburger lines - support both with and without class */
.hamburger-line,
.hamburger-btn span {
  width: 24px;
  height: 3px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  display: block;
}

.hamburger-btn.active .hamburger-line:nth-child(1),
.hamburger-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.hamburger-btn.active .hamburger-line:nth-child(2),
.hamburger-btn.active span:nth-child(2) {
  opacity: 0;
}

.hamburger-btn.active .hamburger-line:nth-child(3),
.hamburger-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* ====================
   Main Container
   ==================== */

.main-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
  width: 100%;
  flex: 1;
}

/* ====================
   Upload Section
   ==================== */

.upload-section {
  margin-bottom: var(--spacing-xl);
}

.upload-zone {
  background: var(--color-surface);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-base);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--color-primary);
  background: var(--color-surface-alt);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--color-shadow);
}

.upload-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

.upload-text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
}

.upload-link {
  color: var(--color-primary);
  text-decoration: underline;
  cursor: pointer;
  font-weight: 500;
}

/* ====================
   Actions Section
   ==================== */

.actions-section {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  justify-content: center;
}

.button-group {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width var(--transition-base), height var(--transition-base);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--color-shadow);
}

.btn:active {
  transform: translateY(0);
}

.btn-icon {
  font-size: var(--font-size-lg);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: white;
}

.btn-secondary {
  background: linear-gradient(135deg, var(--color-secondary), #7c3aed);
  color: white;
}

.btn-success {
  background: linear-gradient(135deg, var(--color-success), #059669);
  color: white;
}

.btn-info {
  background: linear-gradient(135deg, var(--color-info), #0891b2);
  color: white;
}

.btn-warning {
  background: linear-gradient(135deg, var(--color-warning), #d97706);
  color: white;
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent), #db2777);
  color: white;
}

/* ====================
   Editor Section
   ==================== */

.editor-section {
  margin-bottom: var(--spacing-xl);
}

.editor-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.editor-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 12px var(--color-shadow);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.editor-panel:hover {
  box-shadow: 0 8px 24px var(--color-shadow);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.panel-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--color-text);
}

.panel-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.btn-icon-action {
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--spacing-xs);
  cursor: pointer;
  color: var(--color-text-secondary);
  font-size: 20px;
  line-height: 1;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
}

.btn-icon-action:hover {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-primary);
  transform: scale(1.1);
}

.char-count {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: 400;
}

/* Textarea Wrapper for Error Highlighting */
.textarea-wrapper {
  position: relative;
  flex: 1;
  display: flex;
}

.json-textarea {
  width: 100%;
  min-height: 500px;
  padding: var(--spacing-lg);
  border: none;
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  resize: vertical;
  transition: background var(--transition-base), color var(--transition-base);
  flex: 1;
}

.json-textarea:focus {
  outline: none;
  background: var(--color-bg);
}

.json-textarea::placeholder {
  color: var(--color-text-secondary);
  opacity: 0.6;
}

/* Error Indicator */
.error-indicator {
  position: absolute;
  left: 0;
  width: 4px;
  background: var(--color-error);
  transition: all var(--transition-base);
  pointer-events: none;
  z-index: 1;
}

.error-details {
  display: flex;
  align-items: start;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(239, 68, 68, 0.1);
  border-top: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--color-error);
  font-size: var(--font-size-sm);
}

.error-icon {
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.error-info {
  flex: 1;
}

.error-location {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.error-message {
  color: var(--color-text-secondary);
}

/* ====================
   Fullscreen Modal
   ==================== */

.fullscreen-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-overlay);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  backdrop-filter: blur(4px);
}

.fullscreen-modal.active {
  opacity: 1;
  visibility: visible;
}

.fullscreen-content {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  width: 95%;
  height: 90%;
  max-width: 1400px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  transform: scale(0.9);
  transition: transform var(--transition-base);
}

.fullscreen-modal.active .fullscreen-content {
  transform: scale(1);
}

.fullscreen-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.fullscreen-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text);
}

.close-fullscreen {
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-size: 32px;
  cursor: pointer;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  line-height: 1;
}

.close-fullscreen:hover {
  background: var(--color-surface-alt);
  color: var(--color-error);
}

.fullscreen-body {
  flex: 1;
  overflow: auto;
  padding: var(--spacing-lg);
}

.fullscreen-output {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  color: var(--color-text);
  white-space: pre-wrap;
  word-wrap: break-word;
  margin: 0;
}

/* ====================
   Message Container
   ==================== */

.message-container {
  position: fixed;
  top: 100px;
  right: var(--spacing-lg);
  max-width: 400px;
  z-index: var(--z-toast);
}

.message {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  box-shadow: 0 8px 24px var(--color-shadow);
  animation: slideIn var(--transition-base);
  display: flex;
  align-items: start;
  gap: var(--spacing-sm);
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }

  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideOut {
  to {
    transform: translateX(400px);
    opacity: 0;
  }
}

.message-icon {
  font-size: var(--font-size-xl);
  flex-shrink: 0;
}

.message-content {
  flex: 1;
}

.message-title {
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.message-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.message.success {
  border-left: 4px solid var(--color-success);
}

.message.error {
  border-left: 4px solid var(--color-error);
}

.message.info {
  border-left: 4px solid var(--color-info);
}

/* ====================
   Footer
   ==================== */

.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0;
  margin-top: auto;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  font-size: var(--font-size-lg);
}

.footer-icon {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.footer-name {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-info {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.footer-links {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

/* ====================
   Responsive Design - Modern Minimalist Mobile
   ==================== */

@media (max-width: 1024px) {
  .editor-container {
    grid-template-columns: 1fr;
  }

  .actions-section {
    flex-direction: column;
  }

  .button-group {
    width: 100%;
    justify-content: center;
  }

  /* Modern Minimalist Hamburger Button */
  .hamburger-btn {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 6px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 12px;
    z-index: 1001;
    border-radius: 8px;
    transition: all 300ms ease;
    position: relative;
  }

  .hamburger-btn:hover {
    background: rgba(20, 83, 88, 0.1);
  }

  /* Hamburger lines - clean teal design */
  .hamburger-btn span {
    width: 28px;
    height: 3px;
    background: #145358;
    border-radius: 3px;
    transition: all 400ms cubic-bezier(0.4, 0, 0.2, 1);
    display: block;
  }

  /* Transform to X when active */
  .hamburger-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
  }

  .hamburger-btn.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(-20px);
  }

  .hamburger-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  /* Modern Minimalist Drawer */
  .nav-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 320px;
    height: 100vh;
    background: white;
    flex-direction: column;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
    transform: translateX(-100%);
    opacity: 0;
    overflow-y: auto;
    transition:
      transform 450ms cubic-bezier(0.4, 0, 0.2, 1),
      opacity 450ms ease;
    z-index: 1000;
    padding: 80px 0 30px;
  }

  [data-theme="dark"] .nav-menu {
    background: #1a1a1a;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.5);
  }

  .nav-menu.active {
    transform: translateX(0);
    opacity: 1;
  }

  /* Backdrop overlay */
  .nav-menu.active::before {
    content: '';
    position: fixed;
    top: 0;
    left: 320px;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: -1;
    animation: fadeInBackdrop 450ms ease;
  }

  @keyframes fadeInBackdrop {
    from {
      opacity: 0;
    }

    to {
      opacity: 1;
    }
  }

  /* Minimalist menu items */
  .nav-item {
    width: 100%;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  }

  [data-theme="dark"] .nav-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  /* Mobile dropdown styling - start collapsed */
  .nav-item.dropdown .dropdown-content {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    border-radius: 0;
    background: transparent;
    min-width: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 300ms ease, padding 300ms ease;
    padding: 0;
  }

  /* When dropdown is active/expanded */
  .nav-item.dropdown.active .dropdown-content {
    max-height: 500px;
    padding: 0.5rem 0;
    background: rgba(0, 0, 0, 0.03);
  }

  [data-theme="dark"] .nav-item.dropdown.active .dropdown-content {
    background: rgba(255, 255, 255, 0.03);
  }

  /* Dropdown items */
  .nav-item.dropdown .dropdown-item {
    padding: 1rem 2.5rem;
    font-size: 1rem;
    border-left: 3px solid transparent;
  }

  .nav-item.dropdown .dropdown-item:hover {
    background: rgba(20, 83, 88, 0.08);
    border-left-color: #145358;
    color: #145358;
  }

  [data-theme="dark"] .nav-item.dropdown .dropdown-item:hover {
    background: rgba(99, 102, 241, 0.15);
    border-left-color: #6366f1;
    color: #6366f1;
  }

  /* Chevron indicator */
  .nav-item.dropdown .nav-link::after {
    content: '▼';
    display: inline-block;
    margin-left: auto;
    font-size: 0.75rem;
    transition: transform 300ms ease;
  }

  .nav-item.dropdown.active .nav-link::after {
    transform: rotate(180deg);
  }

  /* Clean menu links */
  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 1.5rem 2rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: #2c3e50;
    transition: all 300ms ease;
    position: relative;
    text-align: left;
    border: none;
    background: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  [data-theme="dark"] .nav-link {
    color: #e5e5e5;
  }

  /* Remove dropdown arrows */
  .nav-link::after {
    content: '';
    display: none;
  }

  /* Hover effect */
  .nav-link:hover,
  .nav-link:active {
    background: linear-gradient(90deg,
        rgba(20, 83, 88, 0.08) 0%,
        transparent 100%);
    color: #145358;
    padding-left: 2.5rem;
  }

  [data-theme="dark"] .nav-link:hover,
  [data-theme="dark"] .nav-link:active {
    background: linear-gradient(90deg,
        rgba(99, 102, 241, 0.15) 0%,
        transparent 100%);
    color: #6366f1;
  }

  /* Active indicator */
  .nav-link:hover::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 60%;
    background: #145358;
    border-radius: 0 4px 4px 0;
  }

  [data-theme="dark"] .nav-link:hover::before {
    background: #6366f1;
  }

  /* Theme toggle button in drawer */
  #mobileThemeToggle {
    margin-top: auto;
    background: #145358;
    color: white;
    border-radius: 12px;
    margin: 2rem;
    padding: 1.25rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    transition: all 300ms ease;
  }

  #mobileThemeToggle:hover {
    background: #0f4146;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(20, 83, 88, 0.3);
  }

  [data-theme="dark"] #mobileThemeToggle {
    background: #6366f1;
  }

  [data-theme="dark"] #mobileThemeToggle:hover {
    background: #5558DD;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
  }

  /* Lock body scroll when menu is open */
  body:has(.nav-menu.active) {
    overflow: hidden;
  }
}

@media (max-width: 768px) {
  .main-container {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .nav-brand {
    font-size: var(--font-size-base);
  }

  .brand-name {
    display: none;
  }

  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }

  .json-textarea {
    min-height: 350px;
    font-size: 13px;
  }

  .message-container {
    left: var(--spacing-md);
    right: var(--spacing-md);
    max-width: none;
  }

  .fullscreen-content {
    width: 100%;
    height: 100%;
    border-radius: 0;
  }

  .footer-content {
    gap: var(--spacing-md);
  }

  .footer-links {
    gap: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .button-group {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .upload-zone {
    padding: var(--spacing-lg);
  }

  .upload-icon {
    font-size: 32px;
  }

  .json-textarea {
    min-height: 300px;
  }

  .panel-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  .panel-actions {
    width: 100%;
    justify-content: space-between;
  }
}

/* ====================
   Loading State
   ==================== */

.btn.loading {
  opacity: 0.7;
  pointer-events: none;
  position: relative;
}

.btn.loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid transparent;
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ====================
   Accessibility
   ==================== */

.btn:focus-visible,
.json-textarea:focus-visible,
.theme-toggle:focus-visible,
.nav-link:focus-visible,
.close-fullscreen:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}