/* ==========================================
   CSS Variables & Reset
   ========================================== */
:root {
  /* Colors */
  --color-bg: #0f0f1a;
  --color-bg-secondary: #1a1a2e;
  --color-bg-tertiary: #252542;
  --color-surface: #2d2d4a;
  --color-surface-hover: #3d3d5c;

  --color-primary: #6c63ff;
  --color-primary-light: #8b85ff;
  --color-primary-dark: #4f46e5;

  --color-text: #ffffff;
  --color-text-secondary: #a0a0b8;
  --color-text-muted: #6b6b80;

  --color-success: #10b981;
  --color-success-bg: rgba(16, 185, 129, 0.15);
  --color-error: #ef4444;
  --color-error-bg: rgba(239, 68, 68, 0.15);

  --color-border: #3d3d5c;
  --color-border-strong: #5c5c7a;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(108, 99, 255, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

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

html {
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ==========================================
   App Layout
   ========================================== */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 600px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* ==========================================
   Header
   ========================================== */
.header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.title {
  font-size: 2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title-icon {
  font-size: 2.5rem;
  -webkit-text-fill-color: initial;
}

.subtitle {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-top: var(--spacing-xs);
}

/* ==========================================
   Date Navigation
   ========================================== */
.date-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-btn:hover:not(:disabled) {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

.nav-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.nav-btn svg {
  flex-shrink: 0;
}

.current-date {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.date-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.date-value {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary-light);
}

/* ==========================================
   Controls
   ========================================== */
.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

/* Toggle Switch */
.autocheck-toggle {
  display: flex;
  align-items: center;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
}

.toggle-text {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.toggle-wrapper {
  position: relative;
  width: 48px;
  height: 26px;
}

.toggle-input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 26px;
  transition: all var(--transition-normal);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--color-text-muted);
  border-radius: 50%;
  transition: all var(--transition-normal);
}

.toggle-input:checked+.toggle-slider {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.toggle-input:checked+.toggle-slider::before {
  transform: translateY(-50%) translateX(22px);
  background: var(--color-text);
}

.toggle-input:focus+.toggle-slider {
  box-shadow: 0 0 0 2px rgba(108, 99, 255, 0.3);
}

/* Clear Button */
.clear-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.clear-btn:hover:not(:disabled) {
  background: var(--color-error-bg);
  border-color: var(--color-error);
  color: var(--color-error);
}

.clear-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ==========================================
   Sudoku Grid
   ========================================== */
.sudoku-container {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.sudoku-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 3px solid var(--color-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 1;
  box-shadow: var(--shadow-glow);
}

.cell {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
  font-size: clamp(1.2rem, 4vw, 1.6rem);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  aspect-ratio: 1;
}

/* 3x3 Box Separators usando box-shadow inset para evitar desbordamiento */
.cell:nth-child(3n):not(:nth-child(9n)) {
  box-shadow: inset -2px 0 0 var(--color-primary);
}

.cell:nth-child(n+19):nth-child(-n+27),
.cell:nth-child(n+46):nth-child(-n+54) {
  box-shadow: inset 0 -2px 0 var(--color-primary);
}

/* Celdas en intersección (columna 3 o 6 Y fila 3 o 6) */
.cell:nth-child(3n):not(:nth-child(9n)):nth-child(n+19):nth-child(-n+27),
.cell:nth-child(3n):not(:nth-child(9n)):nth-child(n+46):nth-child(-n+54) {
  box-shadow: inset -2px 0 0 var(--color-primary), inset 0 -2px 0 var(--color-primary);
}

/* Cell States */
.cell.given {
  color: var(--color-text);
  cursor: default;
}

.cell.editable {
  color: var(--color-primary-light);
}

.cell.editable:hover {
  background: var(--color-surface);
}

.cell.selected {
  background: var(--color-surface-hover);
}

.cell.selected::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid var(--color-primary);
  pointer-events: none;
}

/* Partner selection in coop mode - Host (gold/yellow) */
.cell.partner-selected-host::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid #ffd700;
  pointer-events: none;
}

/* Partner selection in coop mode - Guest (cyan/teal) */
.cell.partner-selected-guest::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid #00d9ff;
  pointer-events: none;
}

/* Numbers placed by host - gold/yellow */
.cell.host-placed {
  color: #ffd700 !important;
}

/* Numbers placed by guest - cyan/teal */
.cell.guest-placed {
  color: #00d9ff !important;
}

.cell.selected.highlighted {
  background: var(--color-surface-hover) !important;
}

.cell.editable:focus {
  outline: none;
}

.cell.highlighted {
  background: rgba(108, 99, 255, 0.08);
}

.cell.correct,
.cell.correct:hover {
  background: var(--color-success-bg) !important;
  color: var(--color-success);
}

.cell.incorrect,
.cell.incorrect:hover {
  background: var(--color-error-bg) !important;
  color: var(--color-error);
  animation: shake 0.3s ease;
}

@keyframes shake {

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

  25% {
    transform: translateX(-3px);
  }

  75% {
    transform: translateX(3px);
  }
}

/* Cell Input */
.cell-input {
  position: absolute;
  width: 100%;
  height: 100%;
  background: transparent;
  border: none;
  text-align: center;
  font-size: inherit;
  font-weight: inherit;
  font-family: inherit;
  color: inherit;
  caret-color: var(--color-primary);
  outline: none;
}

.cell-input:focus {
  background: var(--color-surface);
}

/* Loading State */
.loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  background: rgba(15, 15, 26, 0.95);
  border-radius: var(--radius-lg);
  z-index: 10;
}

.loading.hidden {
  display: none;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-surface);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading span {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* ==========================================
   Status Messages
   ========================================== */
.status {
  flex: 1;
  text-align: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
  opacity: 0;
  transition: opacity var(--transition-normal);
  min-height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.status.visible {
  opacity: 1;
}

.status.success {
  background: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid var(--color-success);
}

.status.error {
  background: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  margin-top: auto;
  text-align: center;
  padding-top: var(--spacing-lg);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* ==========================================
   Modal
   ========================================== */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  max-width: 320px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.2s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-text {
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
}

.modal-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

.modal-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.modal-btn-cancel {
  background: var(--color-error);
  color: white;
  border-color: var(--color-error);
}

.modal-btn-cancel:hover {
  background: #dc2626;
}

.modal-btn-confirm {
  background: var(--color-success);
  color: white;
}

.modal-btn-confirm:hover {
  background: #16a34a;
}

/* ==========================================
   User Area
   ========================================== */
.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
}

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

.user-logged-in {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.user-logged-in.hidden,
.user-logged-out.hidden {
  display: none;
}

.username-display {
  color: var(--color-primary-light);
  font-weight: 500;
  font-size: 0.9rem;
}

.user-btn {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-btn:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
}

.user-btn-logout {
  background: transparent;
  color: var(--color-text-secondary);
}

.user-btn-logout:hover {
  color: var(--color-error);
  border-color: var(--color-error);
}

/* ==========================================
   Auth Modal
   ========================================== */
.auth-modal {
  max-width: 360px;
  width: 90%;
}

.auth-tabs {
  display: flex;
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.auth-tab {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.auth-tab.active {
  color: var(--color-primary-light);
}

.auth-tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.auth-form.hidden {
  display: none;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  text-align: left;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.form-group input {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.form-group input::placeholder {
  color: var(--color-text-muted);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.auth-error {
  padding: var(--spacing-sm);
  background: var(--color-error-bg);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-sm);
  color: var(--color-error);
  font-size: 0.85rem;
}

.auth-error.hidden {
  display: none;
}

.auth-submit {
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
  margin-top: var(--spacing-sm);
}

.auth-submit:hover {
  background: var(--color-primary-dark);
}

.auth-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ==========================================
   Responsive
   ========================================== */
@media (max-width: 480px) {
  .app {
    padding: var(--spacing-md);
  }

  .title {
    font-size: 1.5rem;
  }

  .title-icon {
    font-size: 1.8rem;
  }

  .date-nav {
    padding: var(--spacing-sm);
  }

  .nav-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8rem;
  }

  .nav-btn svg {
    width: 16px;
    height: 16px;
  }

  .controls {
    flex-wrap: wrap;
    justify-content: center;
  }
}

/* ==========================================
   Friends & Coop Buttons
   ========================================== */
.user-btn-friends,
.user-btn-coop {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 1.1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-btn-friends:hover,
.user-btn-coop:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
}

/* ==========================================
   Friends Modal
   ========================================== */
.friends-modal {
  max-width: 400px;
  width: 90%;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.modal-header h2 {
  margin: 0;
  font-size: 1.3rem;
}

.modal-close {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.modal-close:hover {
  color: var(--color-text);
}

.friends-search {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.friends-search input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 0.95rem;
}

.friends-search input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-xs);
  max-height: 200px;
  overflow-y: auto;
  z-index: 10;
}

.search-result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item button {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 0.8rem;
  cursor: pointer;
}

.friend-requests {
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md);
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

.friend-requests h3 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.requests-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.request-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-sm);
}

.request-actions {
  display: flex;
  gap: var(--spacing-xs);
}

.request-actions button {
  padding: var(--spacing-xs) var(--spacing-sm);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
}

.btn-accept {
  background: var(--color-success);
  color: white;
}

.btn-reject {
  background: var(--color-error);
  color: white;
}

.friends-list-section h3 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.friends-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.friend-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

.friend-item button {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
}

.friend-item button:hover {
  border-color: var(--color-error);
  color: var(--color-error);
}

.no-friends {
  color: var(--color-text-muted);
  text-align: center;
  padding: var(--spacing-md);
}

/* ==========================================
   Coop Modal
   ========================================== */
.coop-modal {
  max-width: 400px;
  width: 90%;
}

.coop-section {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.coop-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.coop-section h3 {
  margin: 0 0 var(--spacing-xs) 0;
  font-size: 1rem;
}

.coop-description {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  margin-bottom: var(--spacing-sm);
}

.coop-action-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.coop-action-btn:hover {
  background: var(--color-primary-dark);
}

.coop-join {
  display: flex;
  gap: var(--spacing-sm);
}

.coop-join input {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.coop-join input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.sessions-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.session-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface);
  border-radius: var(--radius-md);
}

.session-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.session-info .session-date {
  font-weight: 500;
}

.session-info .session-status {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.session-item button {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 0.8rem;
  cursor: pointer;
}

/* ==========================================
   Coop Waiting Modal
   ========================================== */
.coop-waiting-modal {
  text-align: center;
  max-width: 350px;
}

.coop-waiting-modal h2 {
  margin-bottom: var(--spacing-sm);
}

.coop-waiting-modal p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.invite-code-display {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.invite-code {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-primary-light);
  background: var(--color-surface);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
}

.copy-btn {
  padding: var(--spacing-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 1.2rem;
}

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

.coop-settings {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  text-align: left;
}

.coop-settings label {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.coop-settings input[type="text"] {
  width: 120px;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  text-align: center;
}

/* ==========================================
   Coop Indicator
   ========================================== */
.coop-indicator {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-xs) var(--spacing-md);
  background: linear-gradient(135deg, rgba(108, 99, 255, 0.2), rgba(139, 133, 255, 0.1));
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  max-width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

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

.coop-badge {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--color-primary-light);
}

.coop-partner {
  color: var(--color-text-secondary);
  font-size: 0.85rem;
}

.coop-leave-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
}

.coop-leave-btn:hover {
  border-color: var(--color-error);
  color: var(--color-error);
}

.coop-indicator.hidden {
  display: none;
}

/* Cell highlight for coop partner */
.cell.partner-placed {
  color: #ff9f43 !important;
}

/* ==========================================
   Coop Friends List & Invitations
   ========================================== */
.coop-friends-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-height: 200px;
  overflow-y: auto;
}

.coop-friend-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.coop-friend-item:hover {
  background: var(--color-surface-hover);
}

.coop-friend-item .invite-btn {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.coop-friend-item .invite-btn:hover {
  background: var(--color-primary-dark);
}

.coop-friend-item .invite-btn:disabled {
  background: var(--color-text-muted);
  cursor: not-allowed;
}

.invitations-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.invitation-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background: linear-gradient(135deg, rgba(108, 99, 255, 0.15), rgba(139, 133, 255, 0.05));
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
}

.invitation-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.invitation-from {
  font-weight: 500;
}

.invitation-date {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.invitation-actions {
  display: flex;
  gap: var(--spacing-xs);
}

.invitation-actions button {
  padding: var(--spacing-xs) var(--spacing-sm);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
}

.invitation-actions .btn-accept {
  background: var(--color-success);
  color: white;
}

.invitation-actions .btn-reject {
  background: var(--color-error);
  color: white;
}

/* Coop Invite Received Modal */
.coop-invite-modal {
  text-align: center;
  max-width: 350px;
}

.coop-invite-modal h2 {
  margin-bottom: var(--spacing-md);
}

.coop-invite-modal p {
  margin-bottom: var(--spacing-sm);
}

.invite-details {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-lg) !important;
}

/* Waiting Modal */
.coop-waiting-modal {
  text-align: center;
  max-width: 300px;
}

.waiting-spinner {
  margin: var(--spacing-lg) 0;
}

.coop-waiting-modal h2 {
  margin-bottom: var(--spacing-sm);
}

.coop-waiting-modal p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}
/* ==========================================
   Mobile Number Pad Modal
   ========================================== */
.number-pad-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  opacity: 1;
  transition: opacity 0.2s ease;
}

.number-pad-modal.hidden {
  display: none;
  opacity: 0;
}

.number-pad-container {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  border: 1px solid var(--color-border);
  max-width: 320px;
  width: 90%;
}

.number-pad-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.number-pad-btn {
  aspect-ratio: 1;
  font-size: 1.75rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  min-height: 60px;
}

.number-pad-btn:hover {
  background: var(--color-surface-hover);
  transform: scale(1.02);
}

.number-pad-btn:active {
  transform: scale(0.95);
  background: var(--color-primary);
}

.number-pad-btn.number-pad-action {
  background: var(--color-bg-tertiary);
}

.number-pad-btn.number-pad-action:hover {
  background: var(--color-surface);
}

.number-pad-btn.number-pad-close {
  background: var(--color-error-bg);
  color: var(--color-error);
}

.number-pad-btn.number-pad-close:hover {
  background: var(--color-error);
  color: white;
}

.number-pad-btn.notes-active {
  background: var(--color-primary);
  color: white;
}

.number-pad-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

.number-pad-bottom-btn {
  flex: 1;
  padding: var(--spacing-md);
  font-size: 1rem;
  font-weight: 500;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.15s ease;
}

#numberPadDelete {
  background: var(--color-primary);
  color: white;
}

#numberPadDelete:hover {
  background: var(--color-primary-light);
}

#numberPadClose {
  background: var(--color-surface);
  color: var(--color-text);
}

#numberPadClose:hover {
  background: var(--color-surface-hover);
}