/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #7986b8 0%, #8b6d9c 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.5rem;
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

.container {
  max-width: min(98vw, 1600px);
  max-height: 98vh;
  width: 100%;
  background: white;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  overflow: auto;
  align-items: center;
}

/* Controls - single compact row */
.controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  padding: 0.4rem 0.75rem;
  background: #ecf0f1;
  border-radius: 6px;
  flex-shrink: 0;
  width: fit-content;
  max-width: 90%;
  transition: opacity 0.6s ease;  /* Smooth fade */
}

.controls-fade {
  opacity: 0.35;  /* Subtle but still visible */
}

.icon {
  font-size: 1.3rem;
  line-height: 1;
}

#difficulty-select {
  padding: 0.35rem 0.5rem;
  font-size: 0.8rem;
  border: 1.5px solid #bdc3c7;
  border-radius: 4px;
  background: white;
  color: #2c3e50;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s;
  min-height: 32px;
}

#difficulty-select:hover {
  border-color: #95a5a6;
}

#difficulty-select:focus {
  outline: none;
  border-color: #7986b8;
}

.stat {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: #2c3e50;
  white-space: nowrap;
}

.stat span:first-child {
  font-size: 1.1rem;
}

.stat-value {
  font-family: 'Courier New', monospace;
  min-width: 2.5ch;
  text-align: center;
  font-size: 0.9rem;
}

#reset-button {
  font-size: 1.3rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.15rem 0.3rem;
  transition: transform 0.15s;
  line-height: 1;
  min-width: 36px;
  min-height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

#reset-button:hover {
  transform: scale(1.15);
}

#reset-button:active {
  transform: scale(0.9);
}

/* Language toggle button */
#lang-toggle {
  font-size: 0.85rem;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #ecf0f1;
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  transition: all 0.2s ease;
  font-weight: 500;
}

#lang-toggle:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.5);
}

#lang-toggle:active {
  transform: scale(0.95);
}

/* Board - Mobile first (supports 9x9, 16x16, 30x16) */
#board {
  width: fit-content;
  max-width: 100%;
  margin: 0 auto;
  display: grid;
  gap: 1px;
  background: linear-gradient(135deg, #8395a7 0%, #95a5a6 100%);
  border: 3px solid #7f8c8d;
  border-radius: 8px;
  padding: 2px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15),
              inset 0 2px 4px rgba(0, 0, 0, 0.1);
  touch-action: none; /* Prevent browser touch handling - we handle it ourselves */
}

/* Cell styles */
.cell {
  background: #bdc3c7;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Arial Black', 'Arial Bold', sans-serif;
  font-weight: 900;
  font-size: clamp(0.6rem, 1.5vmin, 1.2rem);
  cursor: pointer;
  transition: all 0.15s;
  border-radius: 2px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  position: relative;
}

.cell.covered {
  background: linear-gradient(145deg, #d5dde0, #a8b4b8);
  box-shadow: inset -2px -2px 4px rgba(0, 0, 0, 0.1),
              inset 2px 2px 4px rgba(255, 255, 255, 0.5),
              0 1px 2px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.05);  /* Subtle separation */
}

.cell.covered:hover {
  background: linear-gradient(145deg, #c8d2d6, #9ba8ac);
  transform: scale(0.98);
}

.cell.covered:active {
  box-shadow: inset 3px 3px 6px rgba(0, 0, 0, 0.25),
              inset -1px -1px 3px rgba(255, 255, 255, 0.5);
  transform: scale(0.95);
}

.cell.pressing {
  background: linear-gradient(145deg, #d4cfc9, #e8e3dc) !important;
  box-shadow:
    inset 0 0 6px rgba(180, 170, 160, 0.4),
    0 0 0 2px rgba(120, 110, 100, 0.25),  /* Soft "outline" via shadow */
    0 0 8px rgba(180, 170, 160, 0.2) !important;
  filter: contrast(1.05);  /* Slight contrast boost for visibility */
  transform: scale(0.97) !important;
  animation: pulse-pressing 0.2s ease-in-out;
}

@keyframes pulse-pressing {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.92; }  /* More subtle pulse */
}

.cell.revealed {
  background: #f8f9fa;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08),
              inset 2px 2px 4px rgba(0, 0, 0, 0.06);
  cursor: default;
}

.cell.revealed:hover {
  transform: none;
}

.cell.flagged {
  background: linear-gradient(145deg, #ecf0f1, #d5dde0);
  box-shadow: inset -2px -2px 5px rgba(0, 0, 0, 0.1),
              inset 2px 2px 5px rgba(255, 255, 255, 0.6),
              0 2px 4px rgba(231, 76, 60, 0.3);
}

.cell.exploded {
  background: radial-gradient(circle, #e74c3c 0%, #c0392b 100%);
  box-shadow: 0 0 15px rgba(231, 76, 60, 0.6),
              inset 0 0 10px rgba(0, 0, 0, 0.3);
  animation: explode 0.5s ease-out;
}

.cell.mine {
  background: linear-gradient(145deg, #455a64, #2c3e50);
  color: #e74c3c;
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.2),
              inset 2px 2px 4px rgba(0, 0, 0, 0.3);
}

/* Animations */
@keyframes explode {
  0% {
    transform: scale(1);
    filter: brightness(1);
  }
  25% {
    transform: scale(1.3);
    filter: brightness(1.5);
  }
  50% {
    transform: scale(0.9) rotate(5deg);
    filter: brightness(1.2);
  }
  75% {
    transform: scale(1.1) rotate(-5deg);
    filter: brightness(1.3);
  }
  100% {
    transform: scale(1) rotate(0deg);
    filter: brightness(1);
  }
}

@keyframes reveal {
  0% {
    transform: scale(0.9);
    opacity: 0.7;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.cell.revealed {
  animation: reveal 0.15s ease-out;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.35);  /* Calmer overlay (was 0.5) */
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s;
}

.modal.show {
  opacity: 1;
}

.modal-content {
  background: white;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);  /* Softer shadow */
  text-align: center;
  max-width: 90%;
  animation: modalSlideIn 0.25s ease-out;  /* Shorter animation */
}

@keyframes modalSlideIn {
  from {
    transform: translateY(-50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-content h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: #2c3e50;
}

.modal-content p {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
  color: #7f8c8d;
  line-height: 1.6;
}

.modal-content button {
  background: linear-gradient(135deg, #7986b8 0%, #8b6d9c 100%);
  color: white;
  border: none;
  padding: 0.75rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}

.modal-content button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.modal-content button:active {
  transform: translateY(0);
}

/* Modal button touch target */
.modal-content button {
  min-height: 44px;  /* iOS minimum touch target */
}

/* Octile cross-promotion styling - minimal, non-intrusive */
.octile-promo {
  font-size: 0.85rem;
  color: #95a5a6;  /* Very muted gray */
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  text-align: center;
  min-height: 44px;  /* Touch target */
  display: flex;
  align-items: center;
  justify-content: center;
}

.octile-promo a {
  color: #7986b8;  /* Calm purple */
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-bottom-color 0.2s;
  margin-left: 0.25rem;  /* Small gap after "Explore further:" */
}

.octile-promo a:hover {
  border-bottom-color: #7986b8;
}

.octile-promo a:focus-visible {
  outline: 2px solid rgba(121, 134, 184, 0.55);
  outline-offset: 2px;
  border-bottom-color: transparent;
}

/* Accessibility: Prefers Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .modal-content {
    animation: none !important;
  }
  .cell.pressing {
    animation: none !important;
  }
}

/* Mobile bottom sheet (Octile Universe - highest impact) */
@media (max-width: 767px) {
  .modal {
    align-items: flex-end;  /* Bottom instead of center */
  }

  .container {
    justify-content: flex-start;  /* Board moves up */
    padding-top: 0.5rem;
  }

  .modal-content {
    width: 100%;
    max-width: 100%;
    max-height: 55vh;  /* Half screen */
    overflow: auto;    /* Handle long content */
    border-radius: 16px 16px 0 0;  /* Rounded top only */
    margin: 0;
    /* iOS safe area */
    padding-bottom: calc(1.25rem + env(safe-area-inset-bottom, 0px));
    animation: slideUpFromBottom 0.28s ease-out;
  }

  @keyframes slideUpFromBottom {
    from {
      transform: translateY(100%);
      opacity: 0;
    }
    to {
      transform: translateY(0);
      opacity: 1;
    }
  }
}

/* Mobile-only difficulties */
@media (max-width: 767px) {
  #difficulty-select option.desktop-only {
    display: none;
  }
}

/* Small mobile adjustments */
@media (max-width: 400px) {
  .container {
    padding: 0.4rem;
  }

  .controls {
    gap: 0.5rem;
    padding: 0.35rem 0.5rem;
  }

  .icon {
    font-size: 1.1rem;
  }

  #difficulty-select {
    font-size: 0.7rem;
    padding: 0.3rem 0.4rem;
  }

  .stat {
    font-size: 0.8rem;
  }

  .stat span:first-child {
    font-size: 1rem;
  }

  #reset-button {
    font-size: 1.1rem;
    min-width: 32px;
    min-height: 32px;
  }
}

/* SVG icon styling */
.cell svg {
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.2));
}

.cell.mine svg {
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.4));
}

.cell.exploded svg {
  filter: drop-shadow(0 0 8px rgba(255, 107, 107, 0.8));
}

.cell.flagged svg {
  filter: drop-shadow(1px 1px 2px rgba(0, 0, 0, 0.3));
}

/* Desktop styles */
@media (min-width: 768px) {
  body {
    padding: 0.5rem;
  }

  .container {
    padding: 0.75rem;
    max-width: min(98vw, 1800px);
    max-height: 96vh;
  }

  .controls {
    gap: 1rem;
    padding: 0.5rem 1rem;
  }

  .icon {
    font-size: 1.5rem;
  }

  .stat {
    font-size: 1rem;
  }

  .stat span:first-child {
    font-size: 1.2rem;
  }

  .cell {
    font-size: clamp(0.7rem, 1.5vmin, 1.3rem);
    border-radius: 3px;
  }

  .cell.covered:hover {
    box-shadow: inset -3px -3px 6px rgba(0, 0, 0, 0.15),
                inset 3px 3px 6px rgba(255, 255, 255, 0.8),
                0 2px 4px rgba(0, 0, 0, 0.15);
  }

  #reset-button {
    font-size: 1.5rem;
    min-width: 40px;
    min-height: 40px;
  }

  #difficulty-select {
    font-size: 0.9rem;
    padding: 0.4rem 0.6rem;
  }

  #board {
    gap: 1.5px;
  }
}

/* Landscape mobile optimization */
@media (max-width: 767px) and (orientation: landscape) {
  body {
    padding: 0.25rem;
  }

  .container {
    padding: 0.35rem;
    gap: 0.3rem;
    max-height: 98vh;
  }

  .controls {
    padding: 0.3rem 0.5rem;
    gap: 0.5rem;
  }

  .icon {
    font-size: 1rem;
  }

  #difficulty-select {
    font-size: 0.7rem;
    padding: 0.25rem 0.35rem;
  }

  .stat {
    font-size: 0.75rem;
  }

  .stat span:first-child {
    font-size: 0.9rem;
  }

  #reset-button {
    font-size: 1rem;
    min-width: 30px;
    min-height: 30px;
  }

  #board {
    gap: 0.5px;
  }

  .cell {
    font-size: clamp(0.5rem, 1.3vmin, 0.85rem);
  }
}

/* Prevent text selection on touch devices */
@media (hover: none) {
  .cell {
    -webkit-tap-highlight-color: transparent;
  }
}

/* OTA Update Banner */
#update-banner {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: linear-gradient(135deg, #0f3460, #1a5276);
  border-bottom: 2px solid #f1c40f;
  padding: 12px 16px;
  text-align: center;
  z-index: 9999;
  color: white;
}

#update-banner.show {
  display: block;
}

#update-banner.force {
  background: linear-gradient(135deg, #b85c00, #c0392b);
  z-index: 9999;
  pointer-events: all;
}

#update-banner.force::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.95);
  z-index: 9998;
  pointer-events: all;
}

#update-text {
  margin: 0 0 8px 0;
  font-size: 14px;
}

.update-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}

.btn-update,
.btn-dismiss {
  padding: 6px 16px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: opacity 0.2s;
}

.btn-update {
  background: #f1c40f;
  color: #2c3e50;
}

.btn-update:hover {
  opacity: 0.9;
}

.btn-dismiss {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

.btn-dismiss:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Help Modal */
#help-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  z-index: 10000;
  padding: 20px;
  overflow-y: auto;
}

#help-modal.show {
  display: flex;
  align-items: center;
  justify-content: center;
}

#help-modal h3 {
  color: #41566f;
  margin-top: 16px;
  margin-bottom: 8px;
}

#help-modal ul {
  padding-left: 24px;
}

#help-modal li {
  margin: 4px 0;
}

.help-octile {
  margin-top: 24px;
  padding: 12px;
  background: #f5f5f5;
  border-left: 3px solid #7986b8;
}

.help-octile p {
  margin: 0;
  font-size: 0.9em;
  color: #666;
}

/* Help Modal Links */
.help-links {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  font-size: 0.9em;
  color: #666;
}

.help-links a {
  color: #7986b8;
  text-decoration: none;
}

.help-links a:hover {
  text-decoration: underline;
}

.help-contact {
  margin-top: 8px;
  font-size: 0.85em;
}

.help-contact-alt {
  margin-top: 4px;
  font-size: 0.75em;
  color: #888;
}

/* Footer */
.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px 20px;
  text-align: center;
  background: rgba(44, 62, 80, 0.95);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8em;
  color: #bbb;
  z-index: 100;
}

.footer-text {
  margin: 0 0 4px 0;
}

.footer-links {
  margin: 0;
}

.footer-links a {
  color: #7986b8;
  text-decoration: none;
  margin: 0 4px;
}

.footer-links a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .footer {
    font-size: 0.7em;
    padding: 8px 12px;
  }
}