/* --- CSS DESIGN SYSTEM & RESET --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Font Families */
  --font-ui: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-sheet: 'Inter', -apple-system, sans-serif;

  /* Theme: Light (Default UI) */
  --bg-app: #f1f5f9;
  --bg-sidebar: rgba(255, 255, 255, 0.75);
  --bg-sidebar-blur: 16px;
  --border-ui: rgba(226, 232, 240, 0.8);
  --border-ui-focus: #4f883d;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --accent: #4f883d;
  --accent-light: #eef5ec;
  --accent-hover: #3b692e;
  --card-bg: #ffffff;
  --hover-bg: rgba(79, 136, 61, 0.06);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -4px rgba(0,0,0,0.05);
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);

  /* Static colors for paper worksheet (always white background, black text/borders) */
  --paper-bg: #ffffff;
  --paper-text: #1e293b;
  --paper-text-muted: #64748b;
  --paper-grid-border: #1e293b;
  --paper-grid-label: #475569;
  --paper-accent: #4f883d; /* Green for answers key */
  --paper-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.08);
}

/* Theme: Dark UI Override */
body.dark-theme {
  --bg-app: #090d16;
  --bg-sidebar: rgba(15, 23, 42, 0.8);
  --border-ui: rgba(51, 65, 85, 0.5);
  --border-ui-focus: #60a54d;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #60a54d;
  --accent-light: rgba(96, 165, 77, 0.15);
  --accent-hover: #4f883d;
  --card-bg: #1e293b;
  --hover-bg: rgba(96, 165, 77, 0.08);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.15), 0 2px 4px -2px rgba(0,0,0,0.15);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.2), 0 4px 6px -4px rgba(0,0,0,0.2);
}

/* Base Body Styling */
body {
  font-family: var(--font-ui);
  background-color: var(--bg-app);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* App Container Layout */
.app-container {
  display: flex;
  flex-wrap: wrap;
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  position: relative;
  overflow: hidden;
}

/* --- SIDEBAR PANEL (LEFT) --- */
.sidebar {
  flex: 0 0 clamp(300px, 32%, 380px);
  width: clamp(300px, 32%, 380px);
  background-color: var(--bg-sidebar);
  backdrop-filter: blur(var(--bg-sidebar-blur));
  -webkit-backdrop-filter: blur(var(--bg-sidebar-blur));
  border-right: 1px solid var(--border-ui);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color var(--transition-normal), border var(--transition-normal);
}

/* Sidebar Header */
.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-ui);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  color: var(--accent);
  width: 28px;
  height: 28px;
}

.logo h1 {
  font-size: 1.35rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #7bb865);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}

/* Theme / Icon Buttons */
.btn-icon {
  background: var(--card-bg);
  border: 1px solid var(--border-ui);
  color: var(--text-main);
  width: 38px;
  height: 38px;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background-color: var(--hover-bg);
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* Sidebar Scroll Content */
.sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Scrollbar Customization */
.sidebar-scroll::-webkit-scrollbar,
.gallery-wrapper::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.sidebar-scroll::-webkit-scrollbar-track,
.gallery-wrapper::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar-scroll::-webkit-scrollbar-thumb,
.gallery-wrapper::-webkit-scrollbar-thumb {
  background: var(--border-ui);
  border-radius: 10px;
}

.sidebar-scroll::-webkit-scrollbar-thumb:hover,
.gallery-wrapper::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Section Styling */
.settings-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.settings-section h2 {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
}

.settings-section h2 i {
  width: 16px;
  height: 16px;
  color: var(--accent);
}

/* Form Controls & Inputs */
.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
}

.slider-label span:last-child {
  color: var(--accent);
  background-color: var(--accent-light);
  padding: 0.15rem 0.5rem;
  border-radius: 6px;
  font-family: monospace;
}

/* Styled Inputs */
.range-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border-ui);
  outline: none;
  transition: background var(--transition-fast);
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 2px 4px rgba(79, 136, 61, 0.4);
  transition: transform var(--transition-fast);
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.select-dropdown, .text-input {
  width: 100%;
  padding: 0.75rem;
  border-radius: 10px;
  border: 1px solid var(--border-ui);
  background-color: var(--card-bg);
  color: var(--text-main);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  outline: none;
  transition: all var(--transition-fast);
}

.select-dropdown:focus, .text-input:focus {
  border-color: var(--border-ui-focus);
  box-shadow: 0 0 0 3px var(--accent-light);
}

textarea.text-input {
  resize: vertical;
}

/* Button Layouts */
.button-row {
  display: flex;
  gap: 0.75rem;
}

.flex-1 {
  flex: 1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1rem;
  border-radius: 10px;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.btn:disabled {
  cursor: wait;
  opacity: 0.75;
  transform: none !important;
  box-shadow: none !important;
}

.btn i {
  width: 16px;
  height: 16px;
}

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

.btn-primary:hover {
  background-color: var(--accent-hover);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--card-bg);
  border-color: var(--border-ui);
  color: var(--text-main);
}

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

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

.btn-accent:hover {
  background-color: var(--accent);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
}

.btn-large {
  width: 100%;
  padding: 1rem;
  font-size: 1rem;
  border-radius: 12px;
}

/* Tool Picker (Stamp / Eraser) */
.tool-picker {
  display: flex;
  gap: 0.75rem;
}

.tool-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.6rem;
  border-radius: 10px;
  background-color: var(--card-bg);
  border: 1px solid var(--border-ui);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tool-btn i {
  width: 20px;
  height: 20px;
}

.tool-btn span {
  font-size: 0.75rem;
  font-weight: 600;
}

.tool-btn:hover {
  border-color: var(--accent);
  color: var(--text-main);
}

.tool-btn.active {
  background-color: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

/* Stamp Preview Container */
.active-stamp-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem;
  border-radius: 10px;
  background: var(--hover-bg);
  border: 1px dashed var(--accent);
}

.active-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.stamp-preview-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--card-bg);
  padding: 0.25rem 0.5rem;
  border-radius: 8px;
  border: 1px solid var(--border-ui);
  min-height: 38px;
}

.stamp-preview-box img {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.stamp-preview-box span {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Search Box */
.search-box-container {
  position: relative;
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  pointer-events: none;
}

.search-input {
  padding-left: 2.25rem !important;
}

/* Gallery Grid */
.gallery-wrapper {
  max-height: 220px;
  overflow-x: hidden;
  overflow-y: auto;
  border: 1px solid var(--border-ui);
  border-radius: 10px;
  background-color: var(--card-bg);
  padding: 0.5rem;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(42px, 1fr));
  gap: 0.5rem;
}

.gallery-item {
  width: 100%;
  min-width: 0;
  aspect-ratio: 1;
  border: 1px solid var(--border-ui);
  background-color: var(--bg-app);
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
  position: relative;
  transition: all var(--transition-fast);
}

.gallery-item img {
  width: 90%;
  height: 90%;
  min-width: 0;
  object-fit: contain;
}

.gallery-item:hover {
  border-color: var(--accent);
  transform: scale(1.08);
  box-shadow: var(--shadow-sm);
  background-color: var(--hover-bg);
}

.gallery-item.selected {
  border-color: var(--accent);
  background-color: var(--accent-light);
  box-shadow: 0 0 0 2px var(--accent);
}

.gallery-item.selected::after {
  content: '';
  position: absolute;
  top: -3px;
  right: -3px;
  width: 8px;
  height: 8px;
  background-color: var(--accent);
  border-radius: 50%;
}

/* Drag & Drop Upload Zone */
.upload-zone {
  border: 2px dashed var(--border-ui);
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 1.25rem 0.75rem;
  text-align: center;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--accent);
  background-color: var(--hover-bg);
}

.upload-icon {
  width: 32px;
  height: 32px;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  transition: color var(--transition-fast);
}

.upload-zone:hover .upload-icon, .upload-zone.dragover .upload-icon {
  color: var(--accent);
  transform: translateY(-2px);
}

.upload-text {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.upload-subtext {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.user-images-container {
  margin-top: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.user-images-container h3 {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
}

/* Checkbox Switch styling */
.checkbox-group {
  flex-direction: row !important;
  align-items: center;
  gap: 0.75rem !important;
  padding: 0.5rem 0;
}

.checkbox-label {
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--border-ui);
  transition: .3s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .3s;
  box-shadow: var(--shadow-sm);
}

input:checked + .slider {
  background-color: var(--accent);
}

input:focus + .slider {
  box-shadow: 0 0 1px var(--accent);
}

input:checked + .slider:before {
  transform: translateX(20px);
}

.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

/* Sidebar Actions & Footer */
.sidebar-actions {
  margin-top: 1rem;
}

.sidebar-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-ui);
  text-align: center;
}

.sidebar-footer span {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Utility Hidden */
.hidden {
  display: none !important;
}


/* --- PREVIEW WORKSPACE AREA (RIGHT) --- */
.preview-area {
  flex: 1 1 420px;
  min-width: min(100%, 420px);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 2rem 1.25rem;
  overflow: auto;
  height: 100vh;
}

.preview-shell {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1rem;
  width: min(100%, 210mm);
  min-width: 0;
}

.preview-actions {
  width: 100%;
  display: flex;
  justify-content: flex-end;
}

.preview-download-btn {
  padding-inline: 1.25rem;
  border-radius: 10px;
  box-shadow: var(--shadow-md);
}

/* A4 Worksheet Sheet Viewport Styling */
.worksheet-paper {
  background-color: var(--paper-bg);
  color: var(--paper-text);
  width: 100%;
  max-width: 210mm;
  min-height: 297mm;
  padding: 20mm;
  border-radius: 12px;
  box-shadow: var(--paper-shadow);
  display: flex;
  flex-direction: column;
  position: relative;
  font-family: var(--font-sheet);
  transition: transform var(--transition-normal);
}

/* Printable Worksheet Header (School Data) */
.sheet-school-header {
  display: flex;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.header-field {
  display: flex;
  align-items: flex-end;
  flex: 2;
}

.header-field.class-field,
.header-field.date-field {
  flex: 1;
}

.field-label {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--paper-text-muted);
  white-space: nowrap;
  margin-right: 0.5rem;
  letter-spacing: 0.5px;
}

.field-line {
  border-bottom: 1.5px dotted #94a3b8;
  flex: 1;
  height: 1.2rem;
}

/* Title Section */
.sheet-title-section {
  margin-bottom: 2rem;
  text-align: center;
}

.sheet-title-section h2 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: #4f883d;
  border: 1px transparent dashed;
  padding: 4px 8px;
  border-radius: 6px;
}

.sheet-title-section p {
  font-size: 0.95rem;
  color: var(--paper-text-muted);
  line-height: 1.4;
  border: 1px transparent dashed;
  padding: 4px 8px;
  border-radius: 6px;
}

/* Content Editable State Indicator in browser */
.editable-text:hover {
  border-color: #cbd5e1 !important;
  background-color: #f8fafc;
  cursor: text;
}

.editable-text:focus {
  border-color: var(--accent) !important;
  background-color: #ffffff;
  outline: none;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* --- THE GRID --- */
.sheet-grid-container {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 2.5rem;
  flex: 1; /* Pushes legend down if space allows */
}

.grid-scroll-limiter {
  width: 100%;
  max-width: 580px; /* Restrict grid size for beautiful look */
  margin: 0 auto;
}

.battleship-grid {
  display: grid;
  width: 100%;
  background-color: transparent;
}

/* Cells styling */
.grid-cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast);
  min-width: 0;
  min-height: 0;
}

/* Label Cells (Columns and Rows headers) */
.grid-cell.col-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--paper-grid-label);
  height: 25px;
  padding-bottom: 4px;
}

.grid-cell.row-label {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--paper-grid-label);
  width: 25px;
  padding-right: 4px;
  justify-content: flex-end;
}

/* Game Playing Cells with borders */
.grid-cell.game-cell {
  border: 2px solid var(--paper-grid-border);
  margin-left: -2px; /* Collapse border overlap */
  margin-top: -2px;
  cursor: pointer;
  background-color: #ffffff;
  aspect-ratio: 1 / 1;
  min-width: 0;
  min-height: 0;
}

/* First elements in row/col shouldn't shift */
.grid-cell.game-cell:hover {
  background-color: var(--hover-bg);
}

.grid-cell.game-cell.cell-preview-hover img {
  opacity: 0.45;
  filter: grayscale(40%);
  transform: scale(0.9);
}

.grid-cell.game-cell.cell-preview-erase::before {
  content: '✕';
  color: #ef4444;
  font-size: 1.5rem;
  font-weight: bold;
  position: absolute;
  z-index: 10;
  text-shadow: 0 0 3px white;
  animation: pulse-red 1s infinite alternate;
}

@keyframes pulse-red {
  from { transform: scale(0.9); opacity: 0.7; }
  to { transform: scale(1.1); opacity: 1; }
}

/* Images inside grid cells */
.grid-cell img.cell-image {
  width: 82%;
  height: 82%;
  object-fit: contain;
  z-index: 2;
  transition: transform var(--transition-fast);
  user-select: none;
  -webkit-user-drag: none;
}

.grid-cell.game-cell:active img.cell-image {
  transform: scale(0.85);
}

/* --- THE LEGEND --- */
.sheet-legend-section {
  border-top: 1.5px dashed #cbd5e1;
  padding-top: 1.5rem;
  margin-top: auto; /* Stays at the bottom of page content */
}

.legend-title {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #4f883d;
  margin-bottom: 1rem;
  letter-spacing: 0.5px;
}

.worksheet-legend {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  column-gap: 3rem;
  row-gap: 1.25rem;
}

.legend-empty-state {
  grid-column: 1 / span 2;
  text-align: center;
  padding: 1.5rem;
  color: var(--paper-text-muted);
  border: 1px dashed #cbd5e1;
  border-radius: 8px;
  font-size: 0.85rem;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.legend-img-box {
  width: 38px;
  height: 38px;
  border: 1.5px solid var(--paper-grid-border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3px;
  background-color: #ffffff;
  flex-shrink: 0;
}

.legend-img-box img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.legend-info {
  display: flex;
  align-items: flex-end;
  flex-grow: 1;
  gap: 0.5rem;
}

.legend-label-editable {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--paper-text);
  border-bottom: 1px dashed transparent;
  padding-bottom: 1px;
}

.legend-label-editable:hover {
  border-color: #94a3b8;
  cursor: text;
  background-color: #f8fafc;
}

.legend-label-editable:focus {
  border-color: var(--accent);
  background-color: #ffffff;
  outline: none;
}

.legend-line {
  border-bottom: 1.5px dotted #94a3b8;
  flex-grow: 1;
  min-width: 60px;
  height: 1.2rem;
  position: relative;
}

.coordinate-answer {
  position: absolute;
  bottom: 0px;
  left: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--paper-accent);
  font-family: var(--font-sheet);
  animation: reveal-coordinate 0.25s ease-out;
}

@keyframes reveal-coordinate {
  from { transform: translateY(4px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* --- WORKSHEET FOOTER --- */
.sheet-footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid #e2e8f0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-left span {
  font-size: 0.75rem;
  color: var(--paper-text-muted);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--paper-text-muted);
}

.mini-icon {
  background-color: #f1f5f9;
  width: 22px;
  height: 22px;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mini-icon i {
  width: 13px;
  height: 13px;
  color: var(--paper-text-muted);
}

.logo-text {
  font-size: 0.8rem;
  font-weight: 700;
  font-family: var(--font-ui);
}


/* --- RESPONSIVE ADJUSTMENTS --- */

/* Width < 850px: Stack panel above sheet */
@media (max-width: 850px) {
  body {
    overflow-y: auto;
  }
  .app-container {
    flex-direction: column;
    height: auto;
  }
  .sidebar {
    width: 100%;
    height: auto;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--border-ui);
    position: relative;
  }
  .sidebar-scroll {
    height: auto;
    overflow-y: visible;
  }
  .preview-area {
    width: 100%;
    height: auto;
    overflow-y: visible;
    padding: 1.5rem 1rem;
    justify-content: center;
  }
  .preview-shell {
    width: 100%;
    max-width: 210mm;
  }
  .worksheet-paper {
    width: 100%;
    max-width: 210mm;
    min-height: auto;
    aspect-ratio: 1 / 1.414; /* A4 aspect ratio */
    padding: 12mm;
  }
  .worksheet-legend {
    column-gap: 1.5rem;
  }
}

/* Width < 600px: Scale paper content down */
@media (max-width: 600px) {
  .worksheet-paper {
    padding: 8mm;
  }
  .sheet-title-section h2 {
    font-size: 1.3rem;
  }
  .sheet-title-section p {
    font-size: 0.8rem;
  }
  .sheet-school-header {
    gap: 0.75rem;
    margin-bottom: 1.5rem;
  }
  .worksheet-legend {
    grid-template-columns: 1fr;
    row-gap: 0.75rem;
  }
  .grid-cell.col-label, .grid-cell.row-label {
    font-size: 0.75rem;
  }
}

/* --- ANSWER KEY PAGE SPECIAL STYLING (SCREEN ONLY) --- */
.worksheet-paper.answer-key-sheet {
  display: none !important; /* Hide on screen preview */
}

.worksheet-paper.answer-key-sheet::before {
  content: 'KLUCZ ODPOWIEDZI';
  position: absolute;
  top: 20px;
  right: 20px;
  background-color: var(--accent);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.35rem 0.8rem;
  border-radius: 6px;
  letter-spacing: 1px;
  z-index: 10;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

/* --- PDF EXPORT OVERRIDES --- */
body.pdf-exporting {
  display: block !important;
  overflow: visible !important;
  background: #ffffff !important;
}

body.pdf-exporting .app-container {
  display: none !important;
}

.pdf-export-root {
  position: static;
  width: 210mm;
  background: #ffffff;
  color: #000000;
  pointer-events: none;
}

.pdf-export-root .worksheet-paper {
  width: 210mm !important;
  max-width: 210mm !important;
  height: 296mm !important;
  min-height: 296mm !important;
  padding: 20mm !important;
  margin: 0 !important;
  border: none !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  background: #ffffff !important;
  color: #000000 !important;
  overflow: hidden !important;
}

.pdf-export-root.has-answer-key .worksheet-paper {
  page-break-after: always;
  break-after: page;
}

.pdf-export-root.has-answer-key .worksheet-paper:last-child {
  page-break-after: auto;
  break-after: auto;
}

.pdf-export-root .worksheet-paper.answer-key-sheet {
  display: flex !important;
}

.pdf-export-root .worksheet-paper.answer-key-sheet::before {
  background-color: #f1f5f9 !important;
  border: 1.5px solid #000000 !important;
  color: #000000 !important;
  top: 8mm !important;
  right: 8mm !important;
}

.pdf-export-root .grid-scroll-limiter {
  max-width: 14cm !important;
  margin: 0 auto !important;
}

.pdf-export-root .battleship-grid {
  width: 14cm !important;
}

.pdf-export-root .coordinate-answer {
  color: #000000 !important;
  background: #ffffff !important;
  font-weight: 800 !important;
  z-index: 2;
}


/* --- PRINT STYLE OVERRIDES --- */
@media print {
  /* Suppress browser decorations */
  * {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
    color-adjust: exact !important;
  }

  body {
    background-color: #ffffff !important;
    background: #ffffff !important;
    color: #000000 !important;
    min-height: 0 !important;
    height: auto !important;
    overflow: visible !important;
  }

  .app-container {
    display: block !important;
    width: auto !important;
    height: auto !important;
    min-height: 0 !important;
  }

  /* Hide sidebar and all other interactive UI */
  .no-print, 
  .sidebar,
  #theme-toggle {
    display: none !important;
  }

  /* Set A4 margins */
  @page {
    size: A4 portrait;
    margin: 12mm 15mm;
  }

  /* Target page sheet container */
  .preview-area {
    padding: 0 !important;
    margin: 0 !important;
    width: 100% !important;
    height: auto !important;
    min-height: 0 !important;
    display: block !important;
    overflow: visible !important;
  }

  .worksheet-paper {
    width: 100% !important;
    max-width: 100% !important;
    height: auto !important;
    min-height: 0 !important;
    padding: 0 !important;
    margin: 0 !important;
    box-shadow: none !important;
    border: none !important;
    border-radius: 0 !important;
    background-color: #ffffff !important;
    background: #ffffff !important;
    color: #000000 !important;
    overflow: visible !important;
    page-break-after: always !important;
    break-after: page !important;
  }

  .worksheet-paper:last-of-type {
    page-break-after: avoid !important;
    break-after: avoid !important;
  }

  /* Answer Key Page print adjustments */
  .worksheet-paper.answer-key-sheet {
    display: block !important; /* Show on print! */
    border: none !important;
    margin: 0 !important;
    box-shadow: none !important;
  }

  .worksheet-paper.answer-key-sheet::before {
    background-color: #f1f5f9 !important;
    border: 1.5px solid #000000 !important;
    color: #000000 !important;
    top: 0 !important;
    right: 0 !important;
  }

  /* Make sure titles are crisp */
  .sheet-title-section h2 {
    font-size: 2rem !important;
    margin-bottom: 0.25rem !important;
  }

  .sheet-title-section p {
    font-size: 1rem !important;
  }

  .editable-text:hover {
    background-color: transparent !important;
    border-color: transparent !important;
  }

  /* Ensure grid is crisp */
  .grid-scroll-limiter {
    max-width: 14cm !important; /* Fixed print size for grid on A4 */
    margin: 1cm auto !important;
  }

  .battleship-grid {
    width: 14cm !important;
    height: auto !important; /* Allow height to adapt to aspect ratio */
    page-break-inside: avoid !important;
    break-inside: avoid !important;
  }

  .grid-cell.game-cell {
    border: 2.5px solid #000000 !important; /* Thick crisp borders for laser printing */
    background-color: #ffffff !important;
  }

  .grid-cell.col-label, .grid-cell.row-label {
    color: #000000 !important;
  }

  /* Legend print styles */
  .sheet-legend-section {
    page-break-inside: avoid !important;
    break-inside: avoid !important;
    margin-top: 1cm !important;
  }

  .worksheet-legend {
    column-gap: 2cm !important;
    row-gap: 0.5cm !important;
  }

  .legend-img-box {
    border: 2px solid #000000 !important;
  }

  .legend-line {
    border-bottom: 1.5px dotted #000000 !important;
  }

  .coordinate-answer {
    color: #000000 !important; /* Answers in black for printable answer key */
    font-weight: bold !important;
  }

  /* Logo styling on print */
  .footer-logo {
    color: #000000 !important;
  }

  .mini-icon {
    border: 1px solid #000000 !important;
    background-color: transparent !important;
  }
}