html, body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 52%;
  max-width: 1080px;
  margin: auto;
  background-color: #f5f0e6;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

@media (max-width: 768px) {
  body {
    padding: 15px;
    overflow-x: hidden;
  }
  
  /* Improve touch targets for mobile */
  .grid-item {
    min-height: 44px;
    min-width: 44px;
  }
  
  .btn {
    padding: 12px 20px;
  }
}

@media (max-width: 480px) {
  body {
    width: 98%;
    padding: 10px;
    overflow-x: hidden;
  }
  
  .grid {
    max-width: 100%;
    box-sizing: border-box;
  }
}

/* header */
h1 {
  color: #50463c;
  text-align: center;
  margin: 30px auto;
}

.game-description {
  color: #50463c;
  text-align: center;
  margin: 20px auto;
  max-width: 600px;
  font-size: 15px;
  line-height: 1.4;
}

@media (max-width: 768px) {
  h1 {
    margin: 20px auto;
    font-size: 2.8em;
  }
  
  .game-description {
    font-size: 15px;
    margin: 15px auto;
    padding: 0 20px;
  }
}

@media (max-width: 480px) {
  h1 {
    margin: 20px auto;
    font-size: 2.4em;
  }
}

/* main */
.grid {
  width: fit-content;
  padding: 15px;
  margin: 25px auto;
  border-radius: 10px;
  display: grid;
  grid-gap: 12px;
  background-color: #b4a596;
}

@media (max-width: 768px) {
  .grid {
    padding: 20px;
    margin: 15px auto;
    grid-gap: 15px;
  }
}

@media (max-width: 480px) {
  .grid {
    padding: 15px;
    margin: 10px auto;
    grid-gap: 10px;
  }
}
#grid2 {
  grid-template-columns: auto auto;
}
#grid3 {
  grid-template-columns: auto auto auto;
}
#grid4 {
  grid-template-columns: auto auto auto auto;
}
#grid5 {
  grid-template-columns: auto auto auto auto auto;
}
#grid6 {
  grid-template-columns: auto auto auto auto auto auto;
}
#grid7 {
  grid-template-columns: auto auto auto auto auto auto auto;
}
.grid-item {
  width: 55px;
  height: 55px;
  border-radius: 6px;
  box-shadow:0 2px 4px rgba(0, 0, 0, 0.1);
  background-color: #e6d7c3;
  color: #50463c;
  font-size: 20px;
  font-weight: 500;
  text-align: center;
  display: flex;
  justify-content: center;
  flex-direction: column;
  cursor: pointer;
  transition: transform 0.1s ease;
}

/* Desktop click effects */
.grid-item:active {
  transform: scale(0.95);
  background-color: #9c8b7a;
}

/* Mobile touch effects */
.grid-item.touching {
  transform: scale(0.95);
  background-color: #9c8b7a;
  transition: transform 0.1s ease, background-color 0.1s ease;
}

/* Enhanced mobile click effects */
@media (max-width: 768px) {
  .grid-item:active,
  .grid-item.touching {
    transform: scale(0.92);
    background-color: #9c8b7a;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
  }
}

#grid6 .grid-item {
  width: 45px;
  height: 45px;
  font-size: 14px;
}

#grid6 {
  grid-gap: 10px;
}

#grid7 .grid-item {
  width: 40px;
  height: 40px;
  font-size: 12px;
}

#grid7 {
  grid-gap: 8px;
}

@media (max-width: 768px) {
  .grid-item {
    width: 85px;
    height: 85px;
    font-size: 28px;
  }
  
  #grid6 .grid-item {
    width: 65px;
    height: 65px;
    font-size: 18px;
  }
  
  #grid6 {
    grid-gap: 12px;
  }
  
  #grid7 .grid-item {
    width: 55px;
    height: 55px;
    font-size: 14px;
  }
  
  #grid7 {
    grid-gap: 10px;
  }
}

@media (max-width: 480px) {
  .grid-item {
    width: 55px;
    height: 55px;
    font-size: 20px;
  }
  
  #grid6 .grid-item {
    width: 50px;
    height: 50px;
    font-size: 14px;
  }
  
  #grid6 {
    grid-gap: 8px;
  }
  
  #grid7 .grid-item {
    width: 45px;
    height: 45px;
    font-size: 12px;
  }
  
  #grid7 {
    grid-gap: 6px;
  }
}

@media (max-width: 360px) {
  .grid-item {
    width: 55px;
    height: 55px;
    font-size: 16px;
  }
  
  #grid6 .grid-item {
    width: 40px;
    height: 40px;
    font-size: 12px;
  }
  
  #grid6 {
    grid-gap: 6px;
  }
  
  #grid7 .grid-item {
    width: 35px;
    height: 35px;
    font-size: 10px;
  }
  
  #grid7 {
    grid-gap: 4px;
  }
  
  .grid {
    padding: 10px;
    margin: 5px auto;
    grid-gap: 8px;
  }
  
  h1 {
    font-size: 1.3em;
    margin: 10px auto;
  }
  
  .btn {
    padding: 10px 15px;
    font-size: 11px;
  }
  
  #navBars {
    margin: 20px auto;
  }
  
  #navBars div {
    margin: 3px;
    min-width: 50px;
  }
}

#result {
  margin: 50px auto;
  width: fit-content;
}
#done,
#stopwatch {
  margin-bottom: 40px;
  color: #50463c;
  text-align: center;
  font-size: 24px;
}
#restart,
#next {
  display: inline;
  margin: 20px;
}

@media (max-width: 768px) {
  #result {
    margin: 30px auto;
  }
  #done,
  #stopwatch {
    margin-bottom: 30px;
    font-size: 24px;
  }
  #restart,
  #next {
    margin: 15px;
  }
}

@media (max-width: 480px) {
  #result {
    margin: 20px auto;
  }
  #done,
  #stopwatch {
    margin-bottom: 20px;
    font-size: 22px;
  }
  #restart,
  #next {
    display: block;
    margin: 10px auto;
    text-align: center;
  }
}
.btn {
  color: #9c8b7a;
  font-family: Arial, Helvetica, sans-serif;
  background-color: #222;
  padding: 20px 30px;
  margin: auto;
  width: fit-content;
  border-radius: 5px;
  box-shadow: 0px 4px 2px #111;
  cursor: pointer;
  transition-duration: 0.1s;
  box-shadow: 0px 4px 2px #111;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

@media (max-width: 768px) {
  .btn {
    padding: 15px 25px;
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  .btn {
    padding: 12px 20px;
    font-size: 14px;
    margin: 5px;
  }
}
.btn:hover {
  color: #9c8b7a;
}
.btn:active {
  background-color: #111;
  box-shadow: 0px 0px 2px #111;
  transform: translateY(2px) scale(0.98);
}

@media (max-width: 768px) {
  .btn:active {
    transform: translateY(5px);
    background-color: #111;
  }
}
.hidden {
  display: none !important;
}
hr {
  border-color: #50463c;
  margin: 30px auto;
}

/* Game Information Section */
.info-section {
  margin: 60px auto;
  max-width: 1200px;
  background: #f5f0e6;
  border-radius: 15px;
  padding: 40px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.info-section h2 {
  color: #50463c;
  text-align: center;
  font-size: 2.5em;
  margin-bottom: 40px;
  font-weight: 700;
}

.info-grid {
  display: flex;
  flex-direction: column;
  gap: 30px;
  margin-bottom: 40px;
}

.info-card {
  background: #e6d7c3;
  border-radius: 12px;
  padding: 25px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.info-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.info-card h3 {
  color: #50463c;
  font-size: 1.4em;
  margin-bottom: 15px;
  font-weight: 600;
  border-bottom: 2px solid #b4a596;
  padding-bottom: 8px;
}

.info-card p {
  color: #50463c;
  line-height: 1.6;
  margin-bottom: 15px;
  font-size: 15px;
}

.info-card ul {
  color: #50463c;
  line-height: 1.6;
  padding-left: 20px;
}

.info-card li {
  margin-bottom: 8px;
  font-size: 14px;
}

.info-card strong {
  color: #50463c;
  font-weight: 600;
}

.research-section {
  background: #e6d7c3;
  border-radius: 12px;
  padding: 25px;
  margin-top: 30px;
}

.research-section h3 {
  color: #50463c;
  font-size: 1.4em;
  margin-bottom: 15px;
  font-weight: 600;
  border-bottom: 2px solid #b4a596;
  padding-bottom: 8px;
}

.research-section p {
  color: #50463c;
  line-height: 1.6;
  margin-bottom: 15px;
  font-size: 15px;
}

.research-section ul {
  color: #50463c;
  line-height: 1.6;
  padding-left: 20px;
}

.research-section li {
  margin-bottom: 8px;
  font-size: 14px;
}

.research-section em {
  font-style: italic;
  color: #50463c;
}
#navBars {
  margin: 30px auto;
  width: fit-content;
  text-align: center;
}

#gridLabel {
  color: #50463c;
  font-size: 18px;
  margin-right: 15px;
  font-weight: 500;
}

#gridSelector {
  background-color: #e6d7c3;
  color: #50463c;
  border: 2px solid #50463c;
  border-radius: 5px;
  padding: 10px 15px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  transition: all 0.3s ease;
}

#gridSelector:hover {
  background-color: #b4a596;
  color: #50463c;
}

#gridSelector:focus {
  border-color: #b4a596;
}

#gridSelector option {
  padding: 5px;
  background-color: #e6d7c3;
}

@media (max-width: 768px) {
  #navBars {
    margin: 40px auto;
  }
  
  #gridLabel {
    font-size: 20px;
    margin-right: 10px;
  }
  
  #gridSelector {
    padding: 10px 15px;
    font-size: 18px;
  }
  
  /* Info section mobile styles */
  .info-section {
    margin: 40px auto;
    padding: 25px;
  }
  
  .info-section h2 {
    font-size: 2.2em;
    margin-bottom: 30px;
  }
  
  .info-grid {
    gap: 20px;
  }
  
  .info-card {
    padding: 20px;
  }
  
  .info-card h3 {
    font-size: 1.4em;
  }
  
  .info-card p,
  .info-card li {
    font-size: 16px;
  }
  
  .research-section {
    padding: 20px;
  }
  
  /* Timer section mobile optimization */
  #timer-section {
    margin: 20px auto;
  }
  
  #stopwatch {
    font-size: 20px;
  }
  
  /* Result section mobile optimization */
  #result {
    margin: 30px auto;
  }
  
  #restart,
  #next {
    display: block;
    margin: 15px auto;
    width: 80%;
    max-width: 200px;
  }
}

@media (max-width: 480px) {
  #navBars {
    margin: 30px auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
  }
  
  #gridLabel {
    font-size: 18px;
    margin-right: 0;
    margin-bottom: 5px;
  }
  
  #gridSelector {
    padding: 12px 18px;
    font-size: 16px;
    min-width: 180px;
  }
  
  /* Info section small screen styles */
  .info-section {
    margin: 30px auto;
    padding: 20px;
  }
  
  .info-section h2 {
    font-size: 2em;
    margin-bottom: 25px;
  }
  
  .info-card {
    padding: 15px;
  }
  
  .info-card h3 {
    font-size: 1.3em;
  }
  
  .info-card p,
  .info-card li {
    font-size: 15px;
  }
  
  .research-section {
    padding: 15px;
  }
  
  /* Navigation optimization for small screens */
  #navBars {
    flex-direction: column;
    gap: 10px;
    align-items: center;
  }
  
  #gridLabel {
    font-size: 14px;
    margin-bottom: 5px;
  }
  
  #gridSelector {
    padding: 10px 12px;
    font-size: 14px;
    min-width: 180px;
  }
  
  /* Game area optimization */
  .grid {
    padding: 15px;
    margin: 10px auto;
    grid-gap: 8px;
  }
  
  /* Timer and result sections */
  #timer-section {
    margin: 15px auto;
  }
  
  #stopwatch {
    font-size: 18px;
  }
  
  #result {
    margin: 25px auto;
  }
  
  #restart,
  #next {
    width: 90%;
    max-width: 180px;
    padding: 10px 15px;
    font-size: 15px;
  }
}

/* Extra small devices (phones in landscape mode, small phones) */
@media (max-width: 360px) {
  h1 {
    font-size: 1.8em;
    margin: 15px auto;
  }
  
  .game-description {
    font-size: 13px;
    margin: 10px auto;
    padding: 0 15px;
  }
  
  /* Grid items for very small screens */
  .grid-item {
    width: 42px;
    height: 42px;
    font-size: 14px;
  }
  
  #grid6 .grid-item {
    width: 35px;
    height: 35px;
    font-size: 12px;
  }
  
  #grid7 .grid-item {
    width: 30px;
    height: 30px;
    font-size: 10px;
  }
  
  /* Grid spacing for very small screens */
  .grid {
    width: 95%;
    max-width: 500px;
    padding: 10px;
    margin: 8px auto;
    grid-gap: 6px;
  }
  
  #grid6 {
    grid-gap: 6px;
  }
  
  #grid7 {
    grid-gap: 4px;
  }
  
  /* Info section for very small screens */
  .info-section {
    margin: 20px auto;
    padding: 15px;
  }
  
  .info-section h2 {
    font-size: 1.8em;
    margin-bottom: 20px;
  }
  
  .info-card {
    padding: 12px;
  }
  
  .info-card h3 {
    font-size: 1.2em;
  }
  
  .info-card p,
  .info-card li {
    font-size: 14px;
  }
  
  .research-section {
    padding: 12px;
  }
  
  /* Navigation for very small screens */
  #navBars {
    margin: 20px auto;
  }
  
  #gridLabel {
    font-size: 13px;
  }
  
  #gridSelector {
    padding: 8px 10px;
    font-size: 13px;
    min-width: 160px;
  }
  
  /* Timer and buttons for very small screens */
  #stopwatch {
    font-size: 16px;
  }
  
  #restart,
  #next {
    width: 95%;
    max-width: 160px;
    padding: 8px 12px;
    font-size: 15px;
  }
}

/* Animation Keyframes */
@keyframes successPulse {
  0% {
    transform: scale(1);
    box-shadow: 0 4px 8px rgba(76, 175, 80, 0.3);
  }
  50% {
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(76, 175, 80, 0.5);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 4px 8px rgba(76, 175, 80, 0.3);
  }
}

@keyframes errorShake {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-3px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(3px);
  }
}

/* Modal Overlay Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s ease, backdrop-filter 0.3s ease;
}

.modal-overlay.show {
  opacity: 1;
}

.modal-content {
  background: linear-gradient(135deg, #f5f0e6 0%, #e6d7c3 100%);
  border-radius: 20px;
  padding: 40px;
  max-width: 500px;
  width: 90%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  position: relative;
  transform: scale(0.8) translateY(50px);
  transition: transform 0.3s ease;
  border: 3px solid #b4a596;
}

.modal-overlay.show .modal-content {
  transform: scale(1) translateY(0);
}

.modal-header {
  text-align: center;
  margin-bottom: 30px;
}

.modal-header h2 {
  color: #50463c;
  font-size: 2.2em;
  margin: 0 0 15px 0;
  font-weight: 700;
}

.completion-time {
  color: #50463c;
  font-size: 1.2em;
  font-weight: 500;
  background: rgba(180, 165, 150, 0.3);
  padding: 10px 20px;
  border-radius: 25px;
  display: inline-block;
}

.modal-body {
  text-align: center;
}

.modal-body #done {
  color: #50463c;
  font-size: 1.8em;
  font-weight: 600;
  margin-bottom: 20px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.score-rating {
  color: #50463c;
  font-size: 1.4em;
  font-weight: 700;
  margin-bottom: 15px;
  padding: 12px 20px;
  border-radius: 15px;
  background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
  color: white;
  text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
  box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.score-rating.advanced {
  background: linear-gradient(135deg, #2196F3 0%, #1976D2 100%);
  box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.score-rating.intermediate {
  background: linear-gradient(135deg, #FF9800 0%, #F57C00 100%);
  box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
}

.score-rating.beginner {
  background: linear-gradient(135deg, #f44336 0%, #d32f2f 100%);
  box-shadow: 0 4px 12px rgba(244, 67, 54, 0.3);
}

.score-rating.exceptional {
  background: linear-gradient(135deg, #FFD700 0%, #FFA000 100%);
  box-shadow: 0 4px 12px rgba(255, 215, 0, 0.4);
  color: #333;
  text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.3);
}

.score-reference {
  color: #50463c;
  font-size: 0.9em;
  margin-bottom: 25px;
  padding: 15px;
  background: rgba(180, 165, 150, 0.2);
  border-radius: 10px;
  border-left: 4px solid #b4a596;
  text-align: left;
  line-height: 1.4;
}

.score-reference h4 {
  margin: 0 0 8px 0;
  font-size: 1em;
  font-weight: 600;
  color: #50463c;
}

.score-reference ul {
  margin: 0;
  padding-left: 15px;
}

.score-reference li {
  margin-bottom: 4px;
  font-size: 1.2em;
}

.modal-buttons {
  display: flex;
  gap: 2px;
  justify-content: center;
  flex-wrap: wrap;
}

.modal-btn {
  background: linear-gradient(135deg, #50463c 0%, #3a342e 100%);
  color: #e6d7c3;
  border: none;
  border-radius: 15px;
  padding: 18px 30px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 8px 20px rgba(80, 70, 60, 0.3);
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 160px;
  justify-content: center;
}

.modal-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(80, 70, 60, 0.4);
  background: linear-gradient(135deg, #5a5047 0%, #4a3f38 100%);
}

.modal-btn:hover .btn-icon svg {
  transform: scale(1.1);
}

.restart-btn:hover .btn-icon svg {
  transform: rotate(180deg) scale(1.1);
}

.next-btn:hover .btn-icon svg {
  transform: translateY(-2px) scale(1.1);
}

.modal-btn:active {
  transform: translateY(-1px);
  box-shadow: 0 6px 15px rgba(80, 70, 60, 0.3);
}

.restart-btn {
  background: linear-gradient(135deg, #50463c 0%, #3a342e 100%);
}

.next-btn {
  background: linear-gradient(135deg, #2d5016 0%, #1f350f 100%);
}

.next-btn:hover {
  background: linear-gradient(135deg, #3a6b1f 0%, #2a4a14 100%);
}

.btn-icon {
  font-size: 1.2em;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease;
}

.btn-icon svg {
  width: 20px;
  height: 20px;
  transition: transform 0.2s ease;
}

.btn-text {
  font-family: Arial, Helvetica, sans-serif;
}

.modal-close {
  position: absolute;
  top: 15px;
  right: 20px;
  background: none;
  border: none;
  font-size: 30px;
  color: #50463c;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.3s ease;
}

.modal-close:hover {
  background-color: rgba(180, 165, 150, 0.3);
  transform: rotate(90deg);
}

/* Mobile Modal Styles */
@media (max-width: 768px) {
  .modal-content {
    padding: 35px 25px;
    margin: 20px;
    max-width: 95%;
  }
  
  .modal-header h2 {
    font-size: 2.2em;
  }
  
  .completion-time {
    font-size: 1.3em;
    padding: 12px 20px;
  }
  
  .modal-body #done {
    font-size: 1.8em;
    margin-bottom: 25px;
  }
  
  .score-rating {
    font-size: 1.5em;
    margin-bottom: 15px;
    padding: 12px 20px;
  }
  
  .score-reference {
    font-size: 1em;
    margin-bottom: 25px;
    padding: 15px;
  }
  
  .modal-buttons {
    flex-direction: column;
    gap: 2px;
  }
  
  .modal-btn {
    width: 100%;
    padding: 18px 30px;
    font-size: 18px;
  }
  
  .modal-close {
    top: 12px;
    right: 18px;
    font-size: 30px;
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .modal-content {
    padding: 30px 20px;
    margin: 15px;
    border-radius: 15px;
  }
  
  .modal-header h2 {
    font-size: 1.9em;
  }
  
  .completion-time {
    font-size: 1.1em;
    padding: 10px 16px;
  }
  
  .modal-body #done {
    font-size: 1.6em;
    margin-bottom: 20px;
  }
  
  .score-rating {
    font-size: 1.3em;
    margin-bottom: 12px;
    padding: 10px 16px;
  }
  
  .score-reference {
    font-size: 0.9em;
    margin-bottom: 20px;
    padding: 12px;
  }
  
  .modal-btn {
    padding: 15px 25px;
    font-size: 16px;
    min-width: auto;
  }
  
  .btn-icon {
    font-size: 1.2em;
  }
  
  .btn-icon svg {
    width: 20px;
    height: 20px;
  }
}

/* Landscape orientation optimization for mobile devices */
@media (max-height: 500px) and (orientation: landscape) {
  body {
    padding: 10px;
  }
  
  h1 {
    font-size: 1.5em;
    margin: 10px auto;
  }
  
  .game-description {
    font-size: 12px;
    margin: 5px auto;
  }
  
  .info-section {
    margin: 20px auto;
    padding: 15px;
  }
  
  .info-section h2 {
    font-size: 1.4em;
    margin-bottom: 15px;
  }
  
  .info-grid {
    gap: 15px;
  }
  
  .info-card {
    padding: 12px;
  }
  
  .info-card h3 {
    font-size: 1em;
  }
  
  .info-card p,
  .info-card li {
    font-size: 11px;
  }
  
  .grid {
    width: 90%;
    max-width: 500px;
    padding: 10px;
    margin: 5px auto;
  }
  
  #navBars {
    margin: 15px auto;
  }
  
  #result {
    margin: 15px auto;
  }
  
  #restart,
  #next {
    display: inline-block;
    margin: 5px 10px;
    width: auto;
    padding: 8px 15px;
    font-size: 15px;
  }
}