/* ===== 设计变量 ===== */
:root {
  --color-bg: #f0fdf4;
  --color-bg-dark: #dcfce7;
  --color-primary: #15803d;
  --color-primary-dark: #14532d;
  --color-primary-light: #22c55e;
  --color-accent: #22c55e;
  --color-card: #ffffff;
  --color-gold: #d97706;
  --color-error: #dc2626;
  --color-text: #1e293b;
  --color-muted: #64748b;
  --shadow-green: rgba(21, 128, 61, 0.12);
  --shadow-green-lg: rgba(21, 128, 61, 0.2);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0a1f14;
    --color-bg-dark: #0f2918;
    --color-primary: #22c55e;
    --color-primary-dark: #15803d;
    --color-accent: #4ade80;
    --color-card: #14261c;
    --color-text: #f1f5f9;
    --color-muted: #94a3b8;
    --shadow-green: rgba(34, 197, 94, 0.15);
    --shadow-green-lg: rgba(34, 197, 94, 0.25);
  }
}

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

html, body {
  width: 100%;
  height: 100%;
  min-height: 100%;
  min-height: -webkit-fill-available;
  overflow-x: hidden;
}

body {
  background: var(--color-bg);
  background-image:
    radial-gradient(circle at 20% 80%, rgba(34, 197, 94, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(21, 128, 61, 0.05) 0%, transparent 50%);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@supports (padding-top: env(safe-area-inset-top)) {
  .safe-area-top { padding-top: env(safe-area-inset-top); }
  .safe-area-bottom { padding-bottom: env(safe-area-inset-bottom); }
}

.mahjong-tile {
  position: relative;
  touch-action: manipulation;
  user-select: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  background: linear-gradient(145deg, #fffef7 0%, #f5f0e1 50%, #e8e0c8 100%);
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.8),
    inset 0 -1px 0 rgba(0, 0, 0, 0.05);
}

.mahjong-tile:active {
  transform: scale(0.95) translateY(2px);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}

.mahjong-tile img {
  filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.1));
}

.mahjong-tile img.tile-img {
  transition: opacity 0.12s ease;
}

.mahjong-tile--graphic {
  background: transparent;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
}

.mahjong-tile--sprite {
  background-repeat: no-repeat;
  background-color: transparent;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
  image-rendering: -webkit-optimize-contrast;
}

.mahjong-hand {
  background: linear-gradient(135deg, #166534 0%, #14532d 50%, #0f4224 100%);
  box-shadow:
    inset 0 2px 10px rgba(0, 0, 0, 0.3),
    0 4px 20px rgba(21, 128, 61, 0.3);
  position: relative;
  overflow: hidden;
}

.mahjong-hand::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}

.hand-area-mini {
  background: linear-gradient(135deg, #166534 0%, #14532d 100%);
  border-radius: 8px;
}

.tile-wrapper {
  animation: tileAppear 0.3s ease backwards;
}

.tile-wrapper:nth-child(1) { animation-delay: 0.02s; }
.tile-wrapper:nth-child(2) { animation-delay: 0.04s; }
.tile-wrapper:nth-child(3) { animation-delay: 0.06s; }
.tile-wrapper:nth-child(4) { animation-delay: 0.08s; }
.tile-wrapper:nth-child(5) { animation-delay: 0.10s; }
.tile-wrapper:nth-child(6) { animation-delay: 0.12s; }
.tile-wrapper:nth-child(7) { animation-delay: 0.14s; }
.tile-wrapper:nth-child(8) { animation-delay: 0.16s; }
.tile-wrapper:nth-child(9) { animation-delay: 0.18s; }
.tile-wrapper:nth-child(10) { animation-delay: 0.20s; }
.tile-wrapper:nth-child(11) { animation-delay: 0.22s; }
.tile-wrapper:nth-child(12) { animation-delay: 0.24s; }
.tile-wrapper:nth-child(13) { animation-delay: 0.26s; }
.tile-wrapper:nth-child(14) { animation-delay: 0.28s; }

@keyframes tileAppear {
  from { opacity: 0; transform: translateY(10px) scale(0.9); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.option-card {
  background: var(--color-card);
  border-radius: 12px;
  box-shadow: 0 2px 8px var(--shadow-green);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  border: 2px solid transparent;
  cursor: pointer;
}

.option-card:hover:not(.selected):not(.correct):not(.wrong) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--shadow-green-lg);
  border-color: var(--color-primary-light);
}

.option-card.selected {
  background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--shadow-green-lg);
}

.option-card.correct {
  background: linear-gradient(135deg, #dcfce7 0%, #bbf7d0 100%);
  border-color: var(--color-accent);
  animation: correctPulse 0.5s ease;
}

.option-card.wrong {
  background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
  border-color: var(--color-error);
  animation: wrongShake 0.4s ease;
}

@keyframes correctPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-5px); }
  40%, 80% { transform: translateX(5px); }
}

.stats-panel {
  background: var(--color-card);
  border-radius: 16px;
  box-shadow: 0 4px 20px var(--shadow-green);
}

.stat-item { position: relative; }
.stat-item .stat-value { font-variant-numeric: tabular-nums; }
.stat-item.highlight {
  background: linear-gradient(135deg, rgba(217, 119, 6, 0.1) 0%, rgba(251, 191, 36, 0.05) 100%);
  border-radius: 8px;
}

.streak-number {
  animation: streakPulse 1s ease infinite;
  color: var(--color-gold);
}

@keyframes streakPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  font-weight: 600;
  border-radius: 12px;
  border: none;
  box-shadow: 0 4px 15px var(--shadow-green-lg);
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--shadow-green-lg);
}

.btn-primary:active:not(:disabled) { transform: translateY(0); }

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-secondary {
  background: var(--color-card);
  color: var(--color-muted);
  font-weight: 500;
  border-radius: 12px;
  border: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-secondary:hover { background: var(--color-bg-dark); }

.answer-feedback {
  animation: feedbackAppear 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  backdrop-filter: blur(8px);
}

@keyframes feedbackAppear {
  from { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
  to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

.question-card { animation: slideUp 0.4s ease; }

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.explanation-card {
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
  border: 1px solid rgba(217, 119, 6, 0.2);
  border-radius: 12px;
  animation: fadeSlideIn 0.3s ease;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.loading-spinner {
  border: 3px solid var(--color-bg-dark);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.boot-loading,
.question-loading-panel {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px;
  background: var(--color-bg);
  color: var(--color-muted);
  text-align: center;
}

.question-loading-panel {
  min-height: 220px;
}

.boot-spinner,
.question-loading-panel .loading-spinner {
  width: 48px;
  height: 48px;
}

.load-bar-track {
  width: min(280px, 80vw);
  height: 8px;
  background: var(--color-bg-dark);
  border-radius: 999px;
  overflow: hidden;
}

.load-bar-fill {
  height: 100%;
  width: 8%;
  background: var(--color-primary);
  border-radius: 999px;
  transition: width 0.25s ease;
}

.load-error-panel {
  min-height: 220px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 24px;
  text-align: center;
  color: var(--color-muted);
}

.load-error-panel button {
  margin-top: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: 12px;
  background: var(--color-primary);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}

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

.page-enter { animation: pageEnter 0.4s ease; }

@keyframes pageEnter {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

.menu-panel {
  background: var(--color-card);
  box-shadow: -8px 0 40px rgba(0, 0, 0, 0.18);
  width: min(20rem, 92vw);
  display: flex;
  flex-direction: column;
  max-height: 100dvh;
}

.menu-panel-header {
  flex-shrink: 0;
  padding: 1rem 1rem 0.75rem;
  border-bottom: 1px solid var(--color-bg-dark);
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-card) 100%);
}

.menu-panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem 1rem 1.25rem;
  -webkit-overflow-scrolling: touch;
}

.menu-current-card {
  background: linear-gradient(135deg, rgba(22, 101, 52, 0.08) 0%, rgba(22, 101, 52, 0.03) 100%);
  border: 1px solid rgba(22, 101, 52, 0.15);
  border-radius: 1rem;
  padding: 0.875rem 1rem;
  margin-bottom: 0.75rem;
}

.menu-current-title {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.35;
}

.menu-current-sub {
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-top: 0.25rem;
}

.menu-progress-bar {
  height: 6px;
  border-radius: 999px;
  background: var(--color-bg-dark);
  overflow: hidden;
  margin-top: 0.625rem;
}

.menu-progress-fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width 0.35s ease;
}

.menu-section {
  margin-bottom: 0.875rem;
}

.menu-section-title {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 0.5rem;
  padding: 0 0.125rem;
}

.menu-section-card--compact {
  padding: 0.65rem 0.75rem;
}

.menu-stats-row--tight {
  margin-bottom: 0.5rem;
}

.bank-entry-card {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-align: left;
  padding: 0.85rem 0.9rem;
  border-radius: 1rem;
  border: 1.5px solid rgba(21, 128, 61, 0.18);
  background: linear-gradient(135deg, rgba(21, 128, 61, 0.1), rgba(34, 197, 94, 0.04));
  cursor: pointer;
}

.bank-entry-emoji {
  font-size: 1.6rem;
  line-height: 1;
}

.bank-entry-text {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.bank-entry-label {
  font-size: 0.6875rem;
  color: var(--color-muted);
  font-weight: 600;
}

.bank-entry-name {
  font-size: 0.9375rem;
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.25;
}

.bank-entry-action {
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  background: var(--color-primary);
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
}

.menu-more-details {
  border-radius: 1rem;
  background: var(--color-bg);
  padding: 0.15rem 0.75rem 0.75rem;
}

.menu-more-details > summary {
  list-style: none;
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-muted);
  padding: 0.7rem 0.15rem;
}

.menu-more-details > summary::-webkit-details-marker {
  display: none;
}

.menu-more-details > summary::after {
  content: ' ›';
  float: right;
  font-weight: 400;
}

.menu-more-details[open] > summary::after {
  content: ' ˅';
}

.menu-more-body {
  padding-bottom: 0.25rem;
}

.menu-reset-link {
  display: block;
  width: 100%;
  margin-top: 0.75rem;
  border: none;
  background: transparent;
  color: var(--color-muted);
  font-size: 0.75rem;
  text-decoration: underline;
  cursor: pointer;
  padding: 0.35rem 0;
}

.bank-picker-sheet {
  position: fixed;
  inset: 0;
  z-index: 88;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  padding-top: max(1rem, env(safe-area-inset-top));
  padding-bottom: max(1rem, env(safe-area-inset-bottom));
}

.bank-picker-sheet.hidden {
  display: none;
}

.bank-picker-backdrop {
  position: absolute;
  inset: 0;
  border: none;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(3px);
}

.bank-picker-panel {
  position: relative;
  width: min(100%, 26rem);
  max-height: min(92vh, 860px);
  background: var(--color-card);
  border-radius: 1.25rem;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: bankSheetIn 0.22s ease;
}

@keyframes bankSheetIn {
  from { opacity: 0; transform: scale(0.96) translateY(8px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.bank-picker-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1rem 0.75rem;
  border-bottom: 1px solid var(--color-bg-dark);
}

.bank-picker-title {
  font-size: 1rem;
  font-weight: 800;
}

.bank-picker-sub {
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-top: 0.15rem;
}

.bank-picker-body {
  overflow-y: auto;
  padding: 0.85rem 1rem 1.1rem;
  -webkit-overflow-scrolling: touch;
}

.bank-group + .bank-group {
  margin-top: 0.85rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--color-bg-dark);
}

.bank-group-title {
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-muted);
  margin-bottom: 0.45rem;
  padding-left: 0.15rem;
}

.bank-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem;
}

.bank-grid--challenge {
  grid-template-columns: 1fr;
}

.bank-tile {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  text-align: left;
  padding: 0.65rem 0.7rem;
  border-radius: 0.85rem;
  border: 1.5px solid transparent;
  background: var(--color-card);
  color: var(--color-text);
  box-shadow: 0 1px 2px var(--shadow-green);
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.12s ease, background 0.15s ease;
  position: relative;
  min-height: 3.25rem;
}

.bank-tile:active {
  transform: scale(0.98);
}

.bank-tile.is-active {
  border-color: var(--color-primary);
  background: linear-gradient(135deg, rgba(21, 128, 61, 0.1), rgba(34, 197, 94, 0.06));
  box-shadow: 0 0 0 1px rgba(21, 128, 61, 0.12);
}

.bank-tile--challenge {
  padding: 0.8rem 0.85rem;
  background: linear-gradient(135deg, #ecfdf5, #fff);
  border-color: rgba(21, 128, 61, 0.12);
}

.bank-tile--challenge.is-active {
  background: linear-gradient(135deg, rgba(21, 128, 61, 0.14), rgba(253, 230, 138, 0.2));
  border-color: var(--color-primary);
}

.bank-tile-emoji {
  font-size: 1.35rem;
  line-height: 1;
  flex-shrink: 0;
}

.bank-tile-body {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
}

.bank-tile-name {
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1.2;
}

.bank-tile-count {
  font-size: 0.6875rem;
  color: var(--color-muted);
}

.bank-tile-badge {
  margin-left: auto;
  flex-shrink: 0;
  font-size: 0.625rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #b45309;
  background: #fef3c7;
  border-radius: 999px;
  padding: 0.15rem 0.45rem;
}

.bank-tile-badge--explain {
  color: #1d4ed8;
  background: #dbeafe;
}

.bank-tile--explain.is-active {
  border-color: #2563eb;
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.15);
}

.level-summary {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-top: 0.65rem;
  padding: 0.7rem 0.75rem;
  border-radius: 0.85rem;
  background: linear-gradient(135deg, rgba(21, 128, 61, 0.08), rgba(250, 204, 21, 0.12));
  border: 1px solid rgba(21, 128, 61, 0.15);
}

.level-summary-main {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex: 1;
  min-width: 0;
}

.level-summary-emoji {
  font-size: 1.5rem;
}

.level-summary-label {
  font-size: 0.625rem;
  color: var(--color-muted);
  font-weight: 600;
}

.level-summary-title {
  font-size: 0.875rem;
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.25;
}

.level-summary-count {
  font-size: 0.6875rem;
  color: var(--color-muted);
  margin-top: 0.1rem;
}

.level-summary-btn {
  flex-shrink: 0;
  border: none;
  border-radius: 999px;
  padding: 0.45rem 0.85rem;
  background: var(--color-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
}

.level-picker-sheet {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  padding-top: max(1rem, env(safe-area-inset-top));
  padding-bottom: max(1rem, env(safe-area-inset-bottom));
}

.level-picker-sheet.hidden {
  display: none;
}

.level-picker-backdrop {
  position: absolute;
  inset: 0;
  border: none;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(3px);
}

.level-picker-panel {
  position: relative;
  width: min(100%, 26rem);
  max-height: min(78vh, 640px);
  background: var(--color-card);
  border-radius: 1.25rem;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: bankSheetIn 0.22s ease;
}

.level-picker-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1rem 0.75rem;
  border-bottom: 1px solid var(--color-bg-dark);
}

.level-picker-title {
  font-size: 1rem;
  font-weight: 800;
}

.level-picker-sub {
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-top: 0.15rem;
}

.level-picker-close {
  width: 2rem;
  height: 2rem;
  border: none;
  border-radius: 999px;
  background: var(--color-bg);
  color: var(--color-muted);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}

.level-picker-body {
  overflow-y: auto;
  padding: 0.75rem 1rem 1rem;
  -webkit-overflow-scrolling: touch;
}

.level-sheet-group + .level-sheet-group {
  margin-top: 0.85rem;
}

.level-sheet-group-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-muted);
  margin-bottom: 0.4rem;
}

.level-chip-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.level-chip {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.1rem;
  text-align: left;
  padding: 0.55rem 0.6rem;
  border-radius: 0.75rem;
  border: 1.5px solid var(--color-bg-dark);
  background: var(--color-bg);
  cursor: pointer;
}

.level-chip.is-active {
  border-color: var(--color-primary);
  background: rgba(21, 128, 61, 0.1);
}

.level-chip-lv {
  font-size: 0.6875rem;
  font-weight: 800;
  color: var(--color-primary);
}

.level-chip-name {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.25;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

@media (prefers-color-scheme: dark) {
  .bank-tile--challenge {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.12), var(--color-card));
  }
  .level-summary {
    background: linear-gradient(135deg, rgba(34, 197, 94, 0.12), rgba(250, 204, 21, 0.08));
  }
  .bank-tile-badge {
    background: rgba(250, 204, 21, 0.2);
    color: #fbbf24;
  }
  .bank-tile-badge--explain {
    background: rgba(59, 130, 246, 0.22);
    color: #93c5fd;
  }
}

.menu-field + .menu-field {
  margin-top: 0.625rem;
}

.menu-field label,
.menu-field-label {
  display: block;
  font-size: 0.6875rem;
  color: var(--color-muted);
  margin-bottom: 0.3rem;
  padding-left: 0.125rem;
}

.practice-mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.practice-mode-chip {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  padding: 0.55rem 0.65rem;
  border-radius: 0.75rem;
  border: 1.5px solid var(--color-bg-dark);
  background: var(--color-card);
  color: var(--color-text);
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.practice-mode-chip:hover {
  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-bg-dark));
}

.practice-mode-chip.is-active {
  border-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 12%, var(--color-card));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 25%, transparent);
}

.practice-mode-chip-label {
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1.2;
}

.practice-mode-chip-hint {
  font-size: 0.625rem;
  color: var(--color-muted);
  line-height: 1.3;
}

.practice-mode-chip.is-active .practice-mode-chip-hint {
  color: color-mix(in srgb, var(--color-primary) 70%, var(--color-muted));
}

.menu-select {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border-radius: 0.75rem;
  border: 1px solid var(--color-bg-dark);
  background: var(--color-card);
  color: var(--color-text);
  font-size: 0.8125rem;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  background-size: 1rem;
  padding-right: 2rem;
}

.menu-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.35rem 0.125rem;
  margin-top: 0.5rem;
}

.menu-toggle-row span {
  font-size: 0.8125rem;
  color: var(--color-text);
}

.menu-action-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.menu-action-grid--stack {
  grid-template-columns: 1fr;
}

.menu-action-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.75rem 0.5rem;
  border-radius: 0.875rem;
  background: var(--color-bg);
  border: 1px solid transparent;
  color: var(--color-text);
  font-size: 0.75rem;
  font-weight: 600;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}

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

.menu-action-btn:hover {
  background: var(--color-bg-dark);
}

.menu-action-btn--wide {
  grid-column: 1 / -1;
  flex-direction: row;
  justify-content: flex-start;
  align-items: center;
  padding: 0.875rem 1rem;
  gap: 0.75rem;
}

.menu-action-btn--subtle {
  background: var(--color-card);
  border-color: var(--color-bg-dark);
}

.menu-action-text {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.125rem;
  text-align: left;
}

.menu-action-label {
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.2;
}

.menu-action-desc {
  font-size: 0.6875rem;
  font-weight: 400;
  color: var(--color-muted);
  line-height: 1.35;
}

.menu-action-meta--badge {
  min-width: 1.75rem;
  height: 1.75rem;
  padding: 0 0.5rem;
  border-radius: 9999px;
  background: #fee2e2;
  color: #b91c1c;
  font-size: 0.8125rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.wrong-list-badge {
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.2);
  padding: 0.25rem 0.625rem;
  border-radius: 9999px;
  white-space: nowrap;
}

.menu-action-icon {
  width: 2rem;
  height: 2rem;
  border-radius: 0.625rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.menu-action-icon--red { background: #fee2e2; }
.menu-action-icon--gray { background: var(--color-bg-dark); }

.menu-action-meta {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--color-muted);
  font-weight: 500;
}

.menu-stats-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.menu-stat-chip {
  background: var(--color-card);
  border-radius: 0.75rem;
  padding: 0.625rem;
  text-align: center;
}

.menu-stat-chip strong {
  display: block;
  font-size: 1.25rem;
  font-weight: 800;
  line-height: 1.2;
}

.menu-stat-chip span {
  font-size: 0.625rem;
  color: var(--color-muted);
}

.menu-stat-chip strong.text-primary { color: var(--color-primary); }
.menu-stat-chip strong.text-accent { color: var(--color-accent); }

.menu-activation-details summary {
  cursor: pointer;
  list-style: none;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
  padding: 0.5rem 0;
}

.menu-activation-details summary::-webkit-details-marker {
  display: none;
}

.menu-activation-details[open] summary {
  margin-bottom: 0.5rem;
}

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--shadow-green-lg);
  border-radius: 2px;
}

.navbar-gradient {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  box-shadow: 0 4px 20px var(--shadow-green-lg);
}

/* 首页顶栏：文字/按钮垂直居中 */
.app-navbar {
  flex-shrink: 0;
  padding-top: env(safe-area-inset-top, 0px);
}

.app-navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: 3.25rem;
  padding: 0.625rem 1rem;
}

.app-navbar-left,
.app-navbar-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.app-navbar-right {
  flex-shrink: 0;
}

.app-navbar-logo {
  font-size: 1.5rem;
  line-height: 1;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.app-navbar-titles {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  gap: 0.1rem;
}

.app-navbar-title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.app-navbar-sub {
  margin: 0;
  font-size: 0.6875rem;
  line-height: 1.2;
  color: rgba(255, 255, 255, 0.78);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 11rem;
}

.app-navbar-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
  padding: 0.4rem 0.65rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.2);
  white-space: nowrap;
}

.app-navbar-menu {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: none;
  border-radius: 0.75rem;
  background: transparent;
  color: #fff;
  cursor: pointer;
  padding: 0;
}

.app-navbar-menu:hover,
.app-navbar-menu:active {
  background: rgba(255, 255, 255, 0.12);
}

.progress-ring { transform: rotate(-90deg); }
.progress-ring-circle { transition: stroke-dashoffset 0.5s ease; }

#float-ad-btn {
  animation: floatBtnPulse 2s ease-in-out infinite;
  touch-action: manipulation;
}

@keyframes floatBtnPulse {
  0%, 100% {
    transform: scale(1);
    box-shadow: 0 4px 20px rgba(251, 191, 36, 0.4);
  }
  50% {
    transform: scale(1.05);
    box-shadow: 0 6px 25px rgba(251, 191, 36, 0.6);
  }
}

#float-ad-btn:hover { animation: none; }

#ad-modal > div {
  animation: adModalAppear 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes adModalAppear {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.page-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.125rem;
  padding: 0.5rem 0.625rem 0.5rem 0.375rem;
  border-radius: 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  transition: background 0.15s ease;
  flex-shrink: 0;
}

.page-back-btn:active,
.page-back-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.wrong-page-footer {
  padding: 0.75rem 1rem calc(0.75rem + env(safe-area-inset-bottom, 0px));
  background: var(--color-card);
  border-top: 1px solid var(--color-bg-dark);
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.06);
}

.wrong-page-back-btn {
  width: 100%;
  padding: 0.875rem 1rem;
  border-radius: 0.875rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-bg-dark);
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.wrong-page-back-btn:active {
  transform: scale(0.98);
  opacity: 0.9;
}

.wrong-page-body {
  padding-bottom: 0.5rem;
}

.hidden { display: none !important; }