* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

:root {
  --bg-gradient: linear-gradient(135deg, #FF6B6B 0%, #4ECDC4 100%);
  --card-bg: rgba(255, 255, 255, 0.92);
  --card-border: #e0e0e0;
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-light: #999;
  --green: #4CAF50;
  --green-dark: #388E3C;
  --blue: #2196F3;
  --blue-dark: #1976D2;
  --purple: #9C27B0;
  --purple-dark: #7B1FA2;
  --red: #ef5350;
  --red-dark: #c62828;
  --orange: #FF9800;
  --gold: #FFD700;
  --cell-in-range: #4CAF50;
  --cell-in-range-border: #388E3C;
  --cell-selected-bg: #e3f2fd;
  --cell-selected-border: #90caf9;
  --cell-out-bg: #f5f5f5;
  --cell-out-border: #e0e0e0;
  --cell-bomb-bg: #ff5252;
  --cell-bomb-border: #c62828;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-gradient);
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--text-primary);
}

body.theme-dark {
  --bg-gradient: linear-gradient(135deg, #2C3E50 0%, #4CA1AF 100%);
}

body.theme-vibrant {
  --bg-gradient: linear-gradient(135deg, #FF416C 0%, #FF4B2B 100%);
}

body.theme-cool {
  --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

body.theme-warm {
  --bg-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

body.theme-purple {
  --bg-gradient: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
}

.hidden {
  display: none !important;
}

#app {
  max-width: 480px;
  margin: 0 auto;
  padding: 0 16px;
  min-height: 100vh;
}

#game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
}

#game-title {
  font-size: 22px;
  color: #fff;
  text-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.icon-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.6);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.icon-btn:hover {
  background: rgba(255,255,255,0.85);
}

.section-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
}

.section-card h3 {
  font-size: 16px;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.option-group {
  display: flex;
  gap: 10px;
}

.option-group.two-col .option-btn {
  flex: 1;
}

.option-group.three-col {
  flex-wrap: wrap;
}

.option-group.three-col .option-btn {
  flex: 1;
  min-width: calc(33.33% - 8px);
}

.option-btn {
  background: rgba(255,255,255,0.9);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 10px 8px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transition: all 0.2s;
  font-size: 14px;
  color: var(--text-primary);
}

.option-btn:hover {
  border-color: #bbb;
}

.option-btn.active {
  background: rgba(200, 255, 200, 0.8);
  border-color: var(--green);
  border-width: 2px;
}

.option-btn.active[data-value="easy"],
.option-btn.active[data-value="auto"] {
  background: rgba(255, 243, 186, 0.8);
  border-color: var(--gold);
}

.option-icon {
  font-size: 24px;
}

.option-text {
  font-weight: 500;
}

.option-sub {
  font-size: 12px;
  color: var(--text-secondary);
}

.button-group {
  margin-top: 16px;
}

.top-row {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}

.bottom-row {
  display: flex;
  gap: 10px;
}

.action-btn {
  border: none;
  border-radius: 12px;
  padding: 14px 20px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  color: #fff;
  transition: all 0.2s;
  text-align: center;
}

.action-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.action-btn:active {
  transform: translateY(0);
}

.action-btn.primary {
  background: linear-gradient(180deg, #66BB6A, #4CAF50);
  border: 2px solid var(--green-dark);
  flex: 1;
}

.action-btn.purple {
  background: linear-gradient(180deg, #BA68C8, #9C27B0);
  border: 2px solid var(--purple-dark);
  flex: 2;
}

.action-btn.green {
  background: linear-gradient(180deg, #66BB6A, #4CAF50);
  border: 2px solid var(--green-dark);
  flex: 1;
}

.action-btn.blue {
  background: linear-gradient(180deg, #42A5F5, #2196F3);
  border: 2px solid var(--blue-dark);
}

.action-btn.blue.small,
.action-btn.green.small {
  padding: 10px 16px;
  font-size: 14px;
  flex: 1;
}

.action-btn.full-width {
  width: 100%;
}

.action-btn.half {
  flex: 1;
}

#game-interface {
  padding-bottom: 20px;
}

#game-info {
  background: rgba(255,255,255,0.85);
  border: 1px solid rgba(224,224,224,0.8);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 12px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  color: var(--text-primary);
  line-height: 1.8;
}

#info-timer {
  text-align: center;
  font-size: 14px;
  color: var(--red);
  font-weight: bold;
}

#number-grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 3px;
  margin-bottom: 12px;
}

.grid-cell {
  aspect-ratio: 1;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
  position: relative;
}

.grid-cell.in-range {
  background: var(--cell-in-range);
  border: 1px solid var(--cell-in-range-border);
  color: #fff;
}

.grid-cell.in-range:hover {
  filter: brightness(1.15);
  transform: scale(1.05);
}

.grid-cell.in-range:active {
  transform: scale(0.95);
}

.grid-cell.selected {
  background: var(--cell-selected-bg);
  border: 1px solid var(--cell-selected-border);
  color: #9aa0a6;
  cursor: default;
}

.grid-cell.out-range {
  background: var(--cell-out-bg);
  border: 1px solid var(--cell-out-border);
  color: #bbb;
  cursor: default;
  opacity: 0.5;
}

.grid-cell.bomb-revealed {
  background: var(--cell-bomb-bg);
  border: 1px solid var(--cell-bomb-border);
  color: #fff;
  animation: bomb-pulse 0.5s ease-in-out;
}

@keyframes bomb-pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.grid-cell.empty {
  visibility: hidden;
}

#game-actions {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
}

#turn-tip {
  background: linear-gradient(180deg, #ff6b6b, #ee5a24);
  border: 2px solid #c0392b;
  border-radius: 8px;
  padding: 12px;
  text-align: center;
  color: #fff9c4;
  font-weight: bold;
  font-size: 16px;
  animation: glow 1.5s ease-in-out infinite alternate;
}

@keyframes glow {
  from { box-shadow: 0 0 5px rgba(255,87,34,0.5); }
  to { box-shadow: 0 0 15px rgba(255,87,34,0.8); }
}

#hint-bar {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.75);
  color: #fff;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 1000;
  animation: fadeInDown 0.3s ease;
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateX(-50%) translateY(-10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

#modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 100;
}

.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 200;
  width: 90%;
  max-width: 380px;
}

.modal-content {
  background: #fff;
  border: 1px solid #e8e8e8;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

.modal-content h2 {
  text-align: center;
  font-size: 20px;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.06);
  font-size: 20px;
  cursor: pointer;
  color: #555;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: rgba(0,0,0,0.12);
}

.result-icon {
  text-align: center;
  font-size: 48px;
  margin-bottom: 8px;
}

.modal-content p {
  text-align: center;
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

#result-score {
  font-weight: bold;
  color: var(--green);
}

.setting-row {
  display: flex;
  align-items: center;
  margin-bottom: 16px;
  gap: 12px;
}

.setting-row label {
  font-size: 15px;
  color: var(--text-primary);
  min-width: 70px;
  text-align: right;
}

.setting-options {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.setting-btn {
  padding: 8px 16px;
  border-radius: 6px;
  border: 1px solid var(--card-border);
  background: #f5f5f5;
  font-size: 14px;
  cursor: pointer;
  color: var(--text-primary);
  transition: all 0.2s;
  text-decoration: none;
  display: inline-block;
}

.setting-btn.active {
  background: var(--green);
  color: #fff;
  border-color: var(--green);
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.toggle-switch {
  width: 52px;
  height: 30px;
  border-radius: 15px;
  background: #e0e0e0;
  cursor: pointer;
  position: relative;
  transition: background 0.3s;
}

.toggle-switch.active {
  background: var(--green);
}

.toggle-knob {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #fff;
  position: absolute;
  top: 2px;
  left: 2px;
  transition: left 0.3s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.toggle-switch.active .toggle-knob {
  left: 24px;
}

.rules-list p {
  text-align: left;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 2;
}

.room-modal {
  position: relative;
}

.room-id-display {
  text-align: center;
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 12px;
}

.room-section {
  margin-bottom: 12px;
}

.room-section h4 {
  font-size: 15px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.drag-hint {
  font-size: 11px;
  color: #999;
  font-weight: normal;
}

#player-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 4px 0;
  min-height: 40px;
}

.player-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 10px;
  position: relative;
  padding: 8px 12px;
  background: #f8f9fa;
  border: 1px solid #e8e8e8;
  border-radius: 10px;
  cursor: grab;
  transition: background 0.15s, box-shadow 0.15s, transform 0.15s;
  user-select: none;
}

.player-item:hover {
  background: #f0f2f5;
}

.player-item.dragging {
  opacity: 0.5;
  background: #e3f2fd;
  border-color: var(--blue);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  transform: scale(1.02);
}

.player-item.drag-over {
  border-top: 3px solid var(--blue);
}

.player-item .drag-handle {
  font-size: 16px;
  color: #bbb;
  cursor: grab;
  flex-shrink: 0;
}

.player-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, #66bb6a, #43a047);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  font-weight: bold;
  border: 2px solid #e0e0e0;
  flex-shrink: 0;
  position: relative;
}

.player-avatar.host {
  border-color: var(--green);
  background: linear-gradient(135deg, rgba(76,175,80,0.8), rgba(67,160,71,0.6));
}

.player-avatar.current-turn {
  border-color: var(--orange);
  box-shadow: 0 0 8px rgba(255,152,0,0.5);
}

.player-info {
  flex: 1;
  min-width: 0;
}

.player-name {
  font-size: 14px;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.player-status {
  font-size: 11px;
  color: var(--text-light);
}

.player-host-badge {
  font-size: 13px;
}

.player-ready-badge {
  font-size: 12px;
  color: var(--green);
}

.player-order {
  font-size: 11px;
  color: var(--text-light);
  flex-shrink: 0;
}

.player-kick-btn {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--red);
  color: #fff;
  border: none;
  font-size: 13px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
}

.player-kick-btn:hover {
  background: #d32f2f;
}

.join-input-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#input-room-id {
  padding: 12px 16px;
  border: 2px solid var(--card-border);
  border-radius: 10px;
  font-size: 16px;
  text-align: center;
  letter-spacing: 2px;
  outline: none;
  transition: border-color 0.2s;
}

#input-room-id:focus {
  border-color: var(--blue);
}

@media (max-width: 360px) {
  .grid-cell {

@media (min-width: 481px) {
  #app {
    padding: 0 24px;
  }

  .grid-cell {
    font-size: 15px;
  }
}