/* ==========================================================================
   CSS RESET & VARIABLES
   ========================================================================== */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-serif: 'Merriweather', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, monospace;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.4);
}

/* Theme Configuration */
.theme-midnight {
  --bg-color: #080b11;
  --bg-panel: rgba(13, 18, 30, 0.8);
  --bg-panel-solid: #0d121e;
  --bg-input: #171e30;
  --border-color: rgba(56, 189, 248, 0.15);
  --border-color-focus: #38bdf8;
  --accent-color: #38bdf8;
  --accent-hover: #0ea5e9;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --md-code-bg: #1e293b;
  --scrollbar-bg: #1e293b;
  --scrollbar-thumb: #38bdf8;
}

.theme-dracula {
  --bg-color: #1a1a24;
  --bg-panel: rgba(40, 42, 54, 0.8);
  --bg-panel-solid: #282a36;
  --bg-input: #343746;
  --border-color: rgba(189, 147, 249, 0.2);
  --border-color-focus: #bd93f9;
  --accent-color: #ff79c6;
  --accent-hover: #ff92df;
  --text-primary: #f8f8f2;
  --text-secondary: #a9b1d6;
  --text-muted: #6272a4;
  --md-code-bg: #1d1f27;
  --scrollbar-bg: #282a36;
  --scrollbar-thumb: #bd93f9;
}

.theme-nord {
  --bg-color: #1e222a;
  --bg-panel: rgba(46, 52, 64, 0.8);
  --bg-panel-solid: #2e3440;
  --bg-input: #3b4252;
  --border-color: rgba(136, 192, 208, 0.2);
  --border-color-focus: #88c0d0;
  --accent-color: #88c0d0;
  --accent-hover: #8fbcbb;
  --text-primary: #eceff4;
  --text-secondary: #d8dee9;
  --text-muted: #4c566a;
  --md-code-bg: #242933;
  --scrollbar-bg: #2e3440;
  --scrollbar-thumb: #88c0d0;
}

.theme-cyberpunk {
  --bg-color: #030303;
  --bg-panel: rgba(15, 5, 25, 0.85);
  --bg-panel-solid: #0f0519;
  --bg-input: #230833;
  --border-color: rgba(255, 0, 127, 0.35);
  --border-color-focus: #ff007f;
  --accent-color: #bc13fe;
  --accent-hover: #ff007f;
  --text-primary: #00ffcc;
  --text-secondary: #b5b5b5;
  --text-muted: #5e4f75;
  --md-code-bg: #140522;
  --scrollbar-bg: #0f0519;
  --scrollbar-thumb: #ff007f;
}

.theme-obsidian {
  --bg-color: #121212;
  --bg-panel: rgba(30, 30, 30, 0.8);
  --bg-panel-solid: #1e1e1e;
  --bg-input: #2d2d2d;
  --border-color: rgba(249, 38, 114, 0.2);
  --border-color-focus: #f92672;
  --accent-color: #a6e22e;
  --accent-hover: #f92672;
  --text-primary: #f8f8f2;
  --text-secondary: #bfbfbf;
  --text-muted: #75715e;
  --md-code-bg: #272822;
  --scrollbar-bg: #1e1e1e;
  --scrollbar-thumb: #a6e22e;
}

/* ==========================================================================
   GLOBAL STYLES
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-primary);
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: background-color var(--transition-normal);
}

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

a:hover {
  text-decoration: underline;
  color: var(--accent-hover);
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-bg);
}

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

::-webkit-scrollbar-thumb:hover {
  opacity: 0.8;
}

/* ==========================================================================
   HEADER / BRANDING
   ========================================================================== */
.app-header {
  height: 60px;
  background-color: var(--bg-panel-solid);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 10;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  box-shadow: 0 0 12px var(--accent-color);
}

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-text .accent {
  color: var(--accent-color);
  text-shadow: 0 0 8px rgba(var(--accent-color), 0.3);
}

.brand-text .subdomain {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: block;
  margin-top: -2px;
}

.header-actions {
  display: flex;
  gap: 10px;
}

/* Button UI Components */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--accent-color);
  color: #000000;
  font-weight: 600;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.1);
}

.btn-secondary {
  background-color: var(--bg-input);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--scrollbar-bg);
  border-color: var(--border-color-focus);
}

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

.btn-accent:hover {
  background-color: var(--accent-color);
  color: #000;
}

.btn-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border-color: rgba(239, 68, 68, 0.2);
  padding: 8px 12px;
}

.btn-danger:hover {
  background-color: #ef4444;
  color: #fff;
}

.btn-block {
  width: 100%;
}

/* Spinner Animation */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

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

/* ==========================================================================
   APP LAYOUT
   ========================================================================== */
.app-main {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

/* ==========================================================================
   SIDEBAR CONTROL PANEL
   ========================================================================== */
.control-panel {
  width: 300px;
  background-color: var(--bg-panel);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 20px;
  gap: 20px;
  overflow-y: auto;
  z-index: 5;
  backdrop-filter: blur(15px);
  box-shadow: 4px 0 15px rgba(0, 0, 0, 0.2);
}

.panel-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--border-color);
}

.panel-section:last-of-type {
  border-bottom: none;
}

.panel-section h3 {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-section h3 i {
  color: var(--accent-color);
  width: 16px;
  height: 16px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-group label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* Select wrapper and styled selects */
.select-wrapper {
  position: relative;
  width: 100%;
}

.select-wrapper select {
  width: 100%;
  padding: 10px 14px;
  background-color: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  outline: none;
  appearance: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.select-wrapper select:focus {
  border-color: var(--border-color-focus);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.05);
}

.select-arrow {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--text-muted);
  width: 14px;
  height: 14px;
}

/* Range input font size */
.font-size-control {
  display: flex;
  align-items: center;
  gap: 12px;
}

.font-size-control input[type="range"] {
  flex: 1;
  accent-color: var(--accent-color);
  cursor: pointer;
}

.font-size-control span {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  min-width: 40px;
  text-align: right;
}

/* Checkbox customizations */
.checkbox-group {
  margin-top: 6px;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-secondary);
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  display: none;
}

.custom-checkbox {
  width: 18px;
  height: 18px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: all var(--transition-fast);
}

.checkbox-label input[type="checkbox"]:checked + .custom-checkbox {
  background-color: var(--accent-color);
  border-color: var(--accent-color);
}

.checkbox-label input[type="checkbox"]:checked + .custom-checkbox::after {
  content: "";
  display: block;
  width: 5px;
  height: 10px;
  border: solid #000;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-bottom: 2px;
}

.export-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 25px;
  padding-top: 15px;
  border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   WORKSPACE SPLIT-PANEL
   ========================================================================== */
.workspace {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  height: 100%;
}

.workspace-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: rgba(5, 5, 10, 0.2);
}

.editor-container {
  border-right: 1px solid var(--border-color);
}

.panel-header {
  height: 40px;
  background-color: var(--bg-panel-solid);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
  letter-spacing: 0.3px;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-title i {
  color: var(--accent-color);
  width: 14px;
  height: 14px;
}

.editor-stats, .preview-info {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.editor-stats .divider {
  opacity: 0.3;
}

.info-icon {
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  cursor: help;
}

/* ==========================================================================
   EDITOR COMPONENT (Textarea)
   ========================================================================== */
.textarea-wrapper {
  flex: 1;
  position: relative;
  overflow: hidden;
}

#markdown-input {
  width: 100%;
  height: 100%;
  padding: 20px;
  background-color: transparent;
  color: var(--text-primary);
  border: none;
  resize: none;
  outline: none;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.6;
  white-space: pre-wrap;
  tab-size: 4;
}

/* ==========================================================================
   PREVIEW CANVAS / PAGE SIMULATOR
   ========================================================================== */
.preview-container {
  background-color: var(--bg-color);
}

.preview-canvas-wrapper {
  flex: 1;
  overflow-y: auto;
  padding: 30px;
  display: flex;
  justify-content: center;
  scroll-behavior: smooth;
}

/* Simulate actual paper page */
.markdown-body {
  background-color: var(--bg-panel-solid);
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  width: 100%;
  max-width: 800px;
  min-height: 1122px; /* standard A4 ratio preview */
  height: fit-content;
  box-sizing: border-box;
  transition: all var(--transition-normal);
}

/* Page Sizes Configurations */
.markdown-body.a4 {
  width: 210mm;
  min-height: 297mm;
}

.markdown-body.letter {
  width: 215.9mm;
  min-height: 279.4mm;
}

.markdown-body.a5 {
  width: 148mm;
  min-height: 210mm;
}

/* Margin Configurations */
.markdown-body.margin-normal {
  padding: 20mm;
}

.markdown-body.margin-narrow {
  padding: 10mm;
}

.markdown-body.margin-wide {
  padding: 30mm;
}

.markdown-body.margin-none {
  padding: 0;
}

/* Typography styles applied dynamically */
.markdown-body.font-sans {
  font-family: var(--font-sans);
}

.markdown-body.font-serif {
  font-family: var(--font-serif);
}

.markdown-body.font-mono {
  font-family: var(--font-mono);
}

/* ==========================================================================
   MARKDOWN ELEMENT RENDERING STYLES
   ========================================================================== */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

.markdown-body h1 {
  font-size: 2.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.3em;
  margin-top: 0;
}

.markdown-body h2 {
  font-size: 1.75rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.3em;
}

.markdown-body h3 {
  font-size: 1.4rem;
}

.markdown-body h4 {
  font-size: 1.15rem;
}

.markdown-body p {
  margin-top: 0;
  margin-bottom: 1em;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Lists */
.markdown-body ul,
.markdown-body ol {
  margin-top: 0;
  margin-bottom: 1em;
  padding-left: 2em;
  color: var(--text-secondary);
  line-height: 1.6;
}

.markdown-body li {
  margin-bottom: 0.25em;
}

.markdown-body li > ul,
.markdown-body li > ol {
  margin-top: 0.25em;
  margin-bottom: 0;
}

/* Checklists */
.markdown-body input[type="checkbox"] {
  margin: 0 0.2em 0.25em -1.6em;
  vertical-align: middle;
  pointer-events: none;
  accent-color: var(--accent-color);
}

/* Blockquotes */
.markdown-body blockquote {
  padding: 0 1em;
  color: var(--text-muted);
  border-left: 0.25em solid var(--accent-color);
  background-color: var(--bg-panel);
  border-radius: 0 4px 4px 0;
  margin: 1.5em 0;
  font-style: italic;
}

.markdown-body blockquote p {
  margin: 0;
  padding: 10px 0;
}

/* Code & Pre */
.markdown-body code {
  padding: 0.2em 0.4em;
  margin: 0;
  font-size: 85%;
  background-color: var(--md-code-bg);
  border-radius: 6px;
  font-family: var(--font-mono);
  color: var(--accent-color);
  font-weight: 500;
}

.markdown-body pre {
  padding: 16px;
  overflow: auto;
  font-size: 85%;
  line-height: 1.45;
  background-color: var(--md-code-bg);
  border-radius: 8px;
  margin-bottom: 1.2em;
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
}

.markdown-body pre code {
  padding: 0;
  margin: 0;
  font-size: 100%;
  word-break: normal;
  white-space: pre;
  background: transparent;
  border: 0;
  color: var(--text-primary);
  font-weight: 400;
}

/* Horizontal Rule */
.markdown-body hr {
  height: 2px;
  padding: 0;
  margin: 24px 0;
  background-color: var(--border-color);
  border: 0;
}

/* Tables */
.markdown-body table {
  width: 100%;
  overflow: auto;
  border-spacing: 0;
  border-collapse: collapse;
  margin-top: 0;
  margin-bottom: 1.2em;
  color: var(--text-secondary);
}

.markdown-body table th {
  font-weight: 600;
  background-color: var(--bg-panel);
  color: var(--text-primary);
}

.markdown-body table th,
.markdown-body table td {
  padding: 10px 14px;
  border: 1px solid var(--border-color);
}

.markdown-body table tr {
  background-color: transparent;
  border-top: 1px solid var(--border-color);
}

.markdown-body table tr:nth-child(2n) {
  background-color: rgba(255, 255, 255, 0.015);
}

/* Images */
.markdown-body img {
  max-width: 100%;
  box-sizing: content-box;
  background-color: transparent;
  border-radius: 6px;
  margin: 1.5em 0;
}

/* Page Break styling inside simulator */
.markdown-body .page-break {
  display: block;
  border-top: 1px dashed rgba(255, 255, 255, 0.15);
  margin: 20px 0;
  position: relative;
  text-align: center;
  pointer-events: none;
}

.markdown-body .page-break::after {
  content: "SAYFA SONU (PAGE BREAK)";
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--text-muted);
  position: absolute;
  top: -7px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--bg-panel-solid);
  padding: 0 10px;
}

/* Hide line breaks visual separator when disabled */
.markdown-body.hide-breaks .page-break {
  border-top: none;
}
.markdown-body.hide-breaks .page-break::after {
  display: none;
}

/* Syntax Highlighting overrides for Dracula/Nord themes compatibility */
.token.comment, .token.prolog, .token.doctype, .token.cdata {
  color: var(--text-muted);
}
.token.property, .token.tag, .token.boolean, .token.number, .token.constant, .token.symbol, .token.deleted {
  color: #ff79c6;
}
.token.selector, .token.attr-name, .token.string, .token.char, .token.builtin, .token.inserted {
  color: #50fa7b;
}
.token.operator, .token.entity, .token.url, .language-css .token.string, .style .token.string {
  color: var(--text-primary);
}
.token.atrule, .token.attr-value, .token.keyword {
  color: var(--accent-color);
}
.token.function, .token.class-name {
  color: #8be9fd;
}
.token.regex, .token.important, .token.variable {
  color: #f1fa8c;
}

/* ==========================================================================
   MODAL OVERLAY (Print instructions)
   ========================================================================== */
.print-instruction-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background-color: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
  backdrop-filter: blur(10px);
}

.print-instruction-modal.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background-color: var(--bg-panel-solid);
  border: 1px solid var(--border-color-focus);
  border-radius: 12px;
  width: 90%;
  max-width: 500px;
  padding: 30px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.modal-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-content p {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.modal-content ul {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.modal-content li {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.modal-content strong {
  color: var(--text-primary);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 10px;
}

.modal-note {
  margin-top: 5px;
  padding: 10px 14px;
  background-color: rgba(255, 255, 255, 0.03);
  border-radius: 6px;
  border-left: 3px solid var(--accent-color);
}

.modal-note p {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--text-secondary);
}

.modal-note strong {
  color: var(--accent-color);
}

/* Mobile Tabs (hidden by default on desktop) */
.mobile-tabs {
  display: none;
}

/* ==========================================================================
   MOBILE RESPONSIVENESS (Max-width: 768px)
   ========================================================================== */
@media (max-width: 768px) {
  .app-header {
    height: 50px;
    padding: 0 12px;
  }
  
  .brand-text h1 {
    font-size: 1rem;
  }
  
  .brand-text .subdomain {
    font-size: 0.65rem;
  }
  
  .header-actions .btn span {
    display: none; /* Icon-only headers on mobile */
  }
  
  .header-actions .btn {
    padding: 6px 10px;
  }

  /* Mobile bottom tab navigation */
  .mobile-tabs {
    display: flex;
    background-color: var(--bg-panel-solid);
    border-bottom: 1px solid var(--border-color);
    height: 50px;
    width: 100%;
    z-index: 10;
  }
  
  .tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 3px solid transparent;
  }
  
  .tab-btn i {
    width: 18px;
    height: 18px;
  }
  
  .tab-btn:hover {
    color: var(--text-primary);
  }
  
  .tab-btn.active {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
    background-color: rgba(255, 255, 255, 0.02);
  }

  .app-main {
    flex-direction: column !important;
    height: calc(100vh - 100px); /* 100px = header(50px) + tabs(50px) */
    height: calc(100dvh - 100px);
  }

  /* Control Panel sliding drawer layout */
  .control-panel {
    width: 100% !important;
    height: 100% !important;
    border-right: none !important;
    border-bottom: none !important;
    display: none;
    padding: 15px;
    overflow-y: auto;
  }

  .workspace {
    grid-template-columns: 1fr !important;
    height: 100% !important;
    width: 100%;
  }

  .workspace-panel {
    width: 100%;
    height: 100%;
  }

  .editor-container {
    border-right: none !important;
    display: none;
  }

  .preview-container {
    display: none;
  }

  .preview-canvas-wrapper {
    padding: 12px;
  }

  /* Responsive document simulation */
  .markdown-body {
    width: 100% !important;
    min-height: auto !important;
    box-shadow: none !important;
    border: none !important;
    border-radius: 0 !important;
  }

  .markdown-body.margin-normal { padding: 20px !important; }
  .markdown-body.margin-narrow { padding: 10px !important; }
  .markdown-body.margin-wide { padding: 30px !important; }
  .markdown-body.margin-none { padding: 0 !important; }

  /* Active states toggling */
  .app-main.show-editor .editor-container {
    display: flex !important;
  }
  
  .app-main.show-preview .preview-container {
    display: flex !important;
  }
  
  .app-main.show-settings .control-panel {
    display: flex !important;
  }

  /* Printing instruction modal responsiveness */
  .modal-content {
    width: 95%;
    padding: 20px;
    gap: 12px;
  }
  
  .modal-content h2 {
    font-size: 1.2rem;
  }
}

/* ==========================================================================
   PRINT MEDIA CUSTOMIZATION (The core requirements)
   ========================================================================== */
@media print {
  /* Hide all UI elements with high specificity to override active mobile tab rules */
  body .app-header, 
  body .mobile-tabs,
  body .print-instruction-modal,
  body .app-main .control-panel,
  body .app-main.show-settings .control-panel,
  body .app-main .editor-container,
  body .app-main.show-editor .editor-container,
  body .preview-container .panel-header,
  body .preview-info {
    display: none !important;
  }

  html, body {
    background-color: var(--bg-color) !important;
    color: var(--text-primary) !important;
    overflow: visible !important;
    height: auto !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  /* Force display the preview container regardless of active tab */
  body .app-main .preview-container,
  body .app-main.show-editor .preview-container,
  body .app-main.show-settings .preview-container,
  body .app-main.show-preview .preview-container {
    display: block !important;
    width: 100% !important;
    height: auto !important;
    margin: 0 !important;
    padding: 0 !important;
    overflow: visible !important;
    box-shadow: none !important;
    border: none !important;
    background: transparent !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  .app-main {
    margin: 0 !important;
    padding: 0 !important;
    display: block !important;
    overflow: visible !important;
    height: auto !important;
  }

  .workspace {
    display: block !important;
    margin: 0 !important;
    padding: 0 !important;
    overflow: visible !important;
    grid-template-columns: 1fr !important;
  }

  .preview-canvas-wrapper {
    overflow: visible !important;
    padding: 0 !important;
    margin: 0 !important;
    background: transparent !important;
    display: block !important;
  }

  .markdown-body {
    box-shadow: none !important;
    border: none !important;
    margin: 0 !important;
    padding: 0 !important;
    width: 100% !important;
    max-width: 100% !important;
    min-height: 0 !important;
    height: auto !important;
    background-color: var(--bg-color) !important;
    color: var(--text-primary) !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  /* Page breaks are enforced */
  .page-break {
    page-break-before: always !important;
    break-before: page !important;
    border-top: none !important;
    margin: 0 !important;
    height: 0 !important;
  }

  .page-break::after {
    display: none !important;
  }
}

/* ==========================================================================
   HIDDEN PDF INVERTER FEATURES (Canvas + TextLayer approach)
   ========================================================================== */

.pdf-mode-active .control-panel {
  display: none !important;
}

.pdf-mode-active .editor-container {
  display: none !important;
}

.pdf-mode-active .workspace {
  grid-template-columns: 1fr !important;
}

.pdf-mode-active .preview-container {
  width: 100% !important;
  height: 100% !important;
}

.pdf-mode-active .preview-canvas-wrapper {
  padding: 24px !important;
  overflow-y: auto !important;
  height: 100% !important;
  width: 100% !important;
}

.pdf-mode-active .markdown-body {
  padding: 0 !important;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
  width: auto !important;
  min-height: auto !important;
}

/* PDF Page structure */
.pdf-page-wrapper {
  position: relative;
  margin: 24px auto;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  background-color: #000000;
  overflow: hidden;
  border-radius: 6px;
  transition: all var(--transition-normal);
}

.pdf-page-canvas {
  display: block;
  max-width: 100%;
  height: auto;
  filter: invert(1) hue-rotate(180deg);
}

/* PDF.js Text Layer standard styles */
.textLayer {
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
  opacity: 1;
  line-height: 1.0;
  pointer-events: auto;
}

.textLayer span {
  color: transparent;
  position: absolute;
  white-space: pre;
  cursor: text;
  transform-origin: 0% 0%;
}

.textLayer span::selection {
  background-color: rgba(56, 189, 248, 0.35); /* custom translucent blue highlight */
}

/* Header buttons toggling in PDF mode */
.pdf-mode-active #btn-clear {
  display: none !important;
}

.pdf-mode-active #btn-header-print {
  display: inline-flex !important;
}

.pdf-mode-active #btn-pdf-close {
  display: inline-flex !important;
}

/* PDF Mode Print Settings */
@media print {
  body.pdf-mode-active {
    background: transparent !important;
  }
  
  body.pdf-mode-active .app-main {
    overflow: visible !important;
    height: auto !important;
  }
  
  body.pdf-mode-active .preview-canvas-wrapper {
    overflow: visible !important;
    padding: 0 !important;
    margin: 0 !important;
    width: 100% !important;
    display: block !important;
  }
  
  body.pdf-mode-active .markdown-body {
    background: transparent !important;
    padding: 0 !important;
    margin: 0 !important;
    width: 100% !important;
    max-width: 100% !important;
  }

  body.pdf-mode-active .pdf-page-wrapper {
    margin: 0 !important;
    box-shadow: none !important;
    border: none !important;
    border-radius: 0 !important;
    width: 100% !important;
    height: auto !important;
    page-break-after: always !important;
    break-after: page !important;
    position: relative !important;
    display: block !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  
  body.pdf-mode-active .pdf-page-canvas {
    width: 100% !important;
    height: auto !important;
    display: block !important;
    filter: invert(1) hue-rotate(180deg) !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  
  body.pdf-mode-active .textLayer {
    display: block !important;
    opacity: 1 !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
  
  body.pdf-mode-active .textLayer span {
    color: transparent !important;
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }
}