/* Custom design system for Sudoku */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #131a26;
  --bg-tertiary: #1b2537;
  
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-light: rgba(79, 70, 229, 0.15);
  
  --border-color: #1e293b;
  --border-bold: #3b82f6;
  
  /* Game cell states */
  --cell-bg: #131a26;
  --cell-hover: #1e293b;
  --cell-focus: #1e1b4b;
  --cell-related: #162033;
  --cell-same-val: #1e2b48;
  --text-given: #e2e8f0;
  --text-user: #60a5fa;
  --text-note: #a78bfa;
  --text-error: #f87171;
  --cell-error-bg: #450a0a;
  
  --success: #10b981;
  --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

body.theme-light {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: rgba(37, 99, 235, 0.15);
  
  --border-color: #e2e8f0;
  --border-bold: #3b82f6;
  
  --cell-bg: #ffffff;
  --cell-hover: #f1f5f9;
  --cell-focus: #e0f2fe;
  --cell-related: #f8fafc;
  --cell-same-val: #dbeafe;
  --text-given: #0f172a;
  --text-user: #2563eb;
  --text-note: #7c3aed;
  --text-error: #ef4444;
  --cell-error-bg: #fee2e2;
}

body.theme-eye-saver {
  --bg-primary: #f4ecd8;
  --bg-secondary: #ebdcb9;
  --bg-tertiary: #e3d2aa;
  
  --text-primary: #433422;
  --text-secondary: #5c4a37;
  --text-muted: #7d6b58;
  
  --accent: #b45309;
  --accent-hover: #92400e;
  --accent-light: rgba(180, 83, 9, 0.15);
  
  --border-color: #d7c59d;
  --border-bold: #b45309;
  
  --cell-bg: #ebdcb9;
  --cell-hover: #e3d2aa;
  --cell-focus: #fef3c7;
  --cell-related: #f5ece1;
  --cell-same-val: #fde68a;
  --text-given: #433422;
  --text-user: #b45309;
  --text-note: #6d28d9;
  --text-error: #b91c1c;
  --cell-error-bg: #fca5a5;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  overflow-x: hidden;
}

/* Header & Tabs */
.game-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  width: 100%;
  position: sticky;
  top: 0;
  z-index: 100;
}

.tab-bar {
  display: flex;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  height: 56px;
}

.brand {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-right: 2rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.brand span {
  color: var(--border-bold);
}

.nav-tabs {
  display: flex;
  gap: 0.5rem;
  height: 100%;
  align-items: center;
}

.nav-tab {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.85rem;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.nav-tab:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

.nav-tab.active {
  color: var(--text-primary);
  background-color: var(--accent-light);
  border: 1px solid rgba(79, 70, 229, 0.3);
}

.header-links-right {
  margin-left: auto;
  display: flex;
  gap: 1rem;
}

.header-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color 0.2s ease;
}

.header-link:hover {
  color: var(--text-primary);
}

/* Secondary Menu Bar */
.menu-bar {
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  width: 100%;
}

.menu-bar-contents {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.menu-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  transition: all 0.2s ease;
  font-family: inherit;
}

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

.menu-btn:active {
  transform: scale(0.97);
}

/* Dropdown Container */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 0.35rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  min-width: 150px;
  box-shadow: var(--shadow-lg);
  z-index: 10;
  overflow: hidden;
}

.dropdown-content.show {
  display: block;
  animation: slideDown 0.15s ease-out;
}

.dropdown-item {
  width: 100%;
  padding: 0.6rem 1rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  text-align: left;
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.dropdown-item:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

.dropdown-item.active {
  color: var(--text-primary);
  background-color: var(--accent);
}

/* Main Area Layout */
.main-wrapper {
  max-width: 1200px;
  width: 100%;
  margin: 1.5rem auto;
  padding: 0 1rem;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2rem;
  flex: 1;
}

@media (max-width: 992px) {
  .main-wrapper {
    grid-template-columns: 1fr;
  }
}

/* Board Center Layout */
.play-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
}

/* Grid Container */
.sudoku-container {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1 / 1;
  background-color: var(--border-color);
  border: 3px solid var(--text-primary);
  border-radius: 12px;
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  grid-template-rows: repeat(9, 1fr);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  user-select: none;
  touch-action: manipulation;
}

/* Cell Elements */
.sudoku-cell {
  background-color: var(--cell-bg);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  transition: background-color 0.15s ease, color 0.15s ease;
}

/* Border styles for 3x3 blocks */
.sudoku-cell:nth-child(3n) {
  border-right: 2px solid var(--text-primary);
}
.sudoku-cell:nth-child(9n) {
  border-right: none;
}
.sudoku-cell:nth-child(n+19):nth-child(-n+27),
.sudoku-cell:nth-child(n+46):nth-child(-n+54) {
  border-bottom: 2px solid var(--text-primary);
}

/* Cell State Highlights */
.sudoku-cell.hovered {
  background-color: var(--cell-hover);
}

.sudoku-cell.related {
  background-color: var(--cell-related);
}

.sudoku-cell.same-value {
  background-color: var(--cell-same-val);
}

.sudoku-cell.focused {
  background-color: var(--cell-focus);
  outline: 2px solid var(--border-bold);
  outline-offset: -2px;
  z-index: 2;
}

/* Cell content typing */
.sudoku-cell.given {
  color: var(--text-given);
}

.sudoku-cell.user {
  color: var(--text-user);
}

.sudoku-cell.error {
  background-color: var(--cell-error-bg);
  color: var(--text-error);
}

/* Pencil mark subgrid */
.notes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  width: 100%;
  height: 100%;
  padding: 2px;
  pointer-events: none;
}

.note-item {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-note);
  opacity: 0.8;
}

/* Number Pad & Controls */
.controls-container {
  width: 100%;
  max-width: 480px;
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.numpad {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 0.5rem;
}

.num-btn {
  aspect-ratio: 1/1;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  font-family: inherit;
}

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

.num-btn:active {
  transform: scale(0.93);
}

.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1.2fr;
  gap: 0.75rem;
}

.action-btn {
  padding: 0.75rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-family: inherit;
  transition: all 0.2s ease;
}

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

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

/* Sidebar & Ads container */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.adsense-box {
  width: 100%;
  height: 600px;
  background-color: var(--bg-secondary);
  border: 1px dashed var(--border-color);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 1rem;
}

/* Modals & Dialogs */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay.show {
  display: flex;
}

.modal-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  width: 92%;
  max-width: 480px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: zoomIn 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
}

.modal-body {
  padding: 1.5rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  flex: 1;
  max-height: 60vh;
  overflow-y: auto;
}

.modal-body h4 {
  color: var(--text-primary);
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.modal-body p {
  margin-bottom: 1rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

.btn-primary {
  background-color: var(--accent);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: background-color 0.2s ease;
}

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

/* Footer Section */
footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
  width: 100%;
  padding: 1.5rem 1rem;
}

.footer-contents {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Keyframe animations */
@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Responsive Font Scaling for Board Cells */
@media (max-width: 480px) {
  .sudoku-cell {
    font-size: 1.3rem;
  }
  .note-item {
    font-size: 0.5rem;
  }
  .num-btn {
    font-size: 1.25rem;
  }
}

/* Solitaire & Spider Layouts */
.solitaire-board {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

.board-top-row {
  display: flex;
  justify-content: space-between;
  width: 100%;
}

.stock-waste-group, .foundations-group {
  display: flex;
  gap: 0.75rem;
}

.board-tableau {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.75rem;
  width: 100%;
  min-height: 450px;
}

.board-tableau-spider {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 0.5rem;
  width: 100%;
  min-height: 450px;
}

/* Card Styling */
.card-stack {
  display: flex;
  flex-direction: column;
  width: 100%;
  min-height: 120px;
  border-radius: 8px;
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px dashed var(--border-color);
  padding: 0.25rem;
}

.pile-slot {
  width: 90px;
  height: 130px;
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  background-color: rgba(0, 0, 0, 0.15);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--text-muted);
  cursor: pointer;
}

.solitaire-card {
  position: relative;
  width: 100%;
  height: 120px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: -90px;
  box-shadow: var(--shadow-lg);
  user-select: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 0.4rem;
  font-weight: 700;
  font-size: 1.1rem;
  cursor: grab;
  transition: transform 0.1s ease;
}

.solitaire-card:last-child {
  margin-bottom: 0;
}

.solitaire-card.red {
  color: #ef4444;
}

.solitaire-card.black {
  color: var(--text-primary);
}

.solitaire-card.face-down {
  background-color: var(--accent);
  background-image: repeating-linear-gradient(45deg, transparent, transparent 8px, rgba(255,255,255,0.06) 8px, rgba(255,255,255,0.06) 16px);
  border-color: var(--accent-hover);
  color: transparent !important;
  cursor: default;
}

.card-top {
  display: flex;
  justify-content: space-between;
  line-height: 1;
}

.card-bottom {
  display: flex;
  justify-content: flex-end;
  align-items: flex-end;
  line-height: 1;
  font-size: 1.5rem;
}

.solitaire-card.dragging {
  opacity: 0.4;
  transform: scale(0.98);
}

/* Mahjong Layouts */
.mahjong-board-container {
  width: 100%;
  max-width: 800px;
  height: 520px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.mahjong-tile {
  position: absolute;
  width: 42px;
  height: 54px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-bottom: 5px solid var(--border-bold);
  border-right: 4px solid var(--border-bold);
  border-radius: 6px;
  box-shadow: 2px 2px 4px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  cursor: pointer;
  user-select: none;
  transition: background-color 0.15s ease, transform 0.1s ease;
  z-index: 1;
}

.mahjong-tile:hover {
  filter: brightness(1.15);
  transform: translate(-1px, -1px);
}

.mahjong-tile.selected {
  background-color: var(--accent-light);
  border-color: var(--accent);
  border-bottom-color: var(--accent);
  border-right-color: var(--accent);
  transform: scale(1.08) translateY(-2px);
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.4);
  z-index: 9999 !important;
}

.mahjong-tile.blocked {
  filter: brightness(0.65);
  cursor: not-allowed;
}

/* Responsive scale for games board sizing */
@media (max-width: 768px) {
  .pile-slot, .solitaire-card {
    height: 95px;
  }
  .solitaire-card {
    margin-bottom: -72px;
    font-size: 0.9rem;
  }
  .card-bottom {
    font-size: 1.1rem;
  }
  .mahjong-board-container {
    height: 380px;
  }
  .mahjong-tile {
    width: 28px;
    height: 38px;
    font-size: 1.1rem;
    border-bottom-width: 3px;
    border-right-width: 2px;
  }
}

/* Theme select dropdown in menu */
.theme-selector-wrapper {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-selector-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.theme-dropdown {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  outline: none;
  font-family: inherit;
}

/* Hamburger Menu Button - hidden on desktop */
.hamburger-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.65rem;
  cursor: pointer;
  padding: 0.35rem;
  margin-right: 0.5rem;
  line-height: 1;
  transition: opacity 0.2s ease;
  user-select: none;
}

.hamburger-menu-btn:hover {
  opacity: 0.75;
}

/* Mobile Sidebar and Overlay */
.mobile-sidebar {
  position: fixed;
  top: 0;
  left: -280px;
  width: 280px;
  height: 100%;
  z-index: 2000;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.mobile-sidebar.show {
  transform: translateX(280px);
}

.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  z-index: 1999;
  transition: opacity 0.3s ease;
}

.sidebar-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.sidebar-header {
  padding: 1.25rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.6rem;
  cursor: pointer;
  line-height: 1;
}

.sidebar-nav {
  padding: 1.25rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
  overflow-y: auto;
}

.sidebar-nav-tab {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.sidebar-nav-tab:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.sidebar-nav-tab.active {
  background-color: var(--accent-light);
  color: var(--text-primary);
  border: 1px solid rgba(79, 70, 229, 0.2);
}

.sidebar-footer {
  padding: 1.25rem 1rem;
  border-top: 1px solid var(--border-color);
}

/* Responsive Overrides */
@media (max-width: 768px) {
  .hamburger-menu-btn {
    display: block;
  }
  .nav-tabs {
    display: none !important;
  }
  .theme-selector-wrapper {
    display: none !important;
  }
  .header-links-right {
    display: none !important;
  }
  .tab-bar {
    padding: 0 0.75rem;
  }
  .brand {
    margin-right: 0;
    font-size: 1.15rem;
  }
}

/* Screen Orientation Overlay (Landscape suggestion for card games) */
.orientation-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--bg-primary);
  z-index: 9999;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  box-sizing: border-box;
}

/* Show only on mobile screens (max-width: 896px) in portrait orientation */
@media (max-width: 896px) and (orientation: portrait) {
  .orientation-overlay.enforced {
    display: flex;
  }
}

.orientation-icon {
  font-size: 4.5rem;
  margin-bottom: 1.5rem;
  animation: rotate-device-animation 2.2s infinite ease-in-out;
  color: var(--border-bold);
  user-select: none;
}

.orientation-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.orientation-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 320px;
  line-height: 1.6;
}

@keyframes rotate-device-animation {
  0% {
    transform: rotate(0deg);
  }
  40% {
    transform: rotate(-90deg);
  }
  80% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(0deg);
  }
}