/* ============================================================
   敲敲乐 · 样式表
   卡通教育风格 · 活泼明亮 · 儿童友好
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  --c-primary: #6C5CE7;
  --c-primary-light: #A29BFE;
  --c-accent: #FDCB6E;
  --c-success: #00B894;
  --c-danger: #FF6B6B;
  --c-info: #74B9FF;
  --c-warning: #FFD93D;

  --c-bg: #FFF9F0;
  --c-bg-card: #FFFFFF;
  --c-bg-soft: #F8F9FF;

  --c-text: #2D3436;
  --c-text-soft: #636E72;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --shadow-sm: 0 2px 8px rgba(108,92,231,0.08);
  --shadow-md: 0 6px 20px rgba(108,92,231,0.12);
  --shadow-lg: 0 12px 40px rgba(108,92,231,0.18);

  --font: 'Nunito', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --tap: 48px; /* 最小点击区 */
}

/* ---------- 基础重置 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  background: var(--c-bg);
  background-image:
    radial-gradient(circle at 10% 20%, rgba(162,155,254,0.15) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(253,203,110,0.15) 0%, transparent 40%);
  color: var(--c-text);
  font-size: 16px;
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  overflow-x: hidden;
}

#app {
  max-width: 900px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding-bottom: 80px;
}

/* ---------- 顶部导航栏 ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(108,92,231,0.08);
  gap: 12px;
}
.topbar-left .logo {
  font-size: 22px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.topbar-center {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  max-width: 320px;
}
.progress-bar {
  flex: 1;
  height: 12px;
  background: var(--c-bg-soft);
  border-radius: 999px;
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.06);
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--c-primary-light), var(--c-primary));
  border-radius: 999px;
  transition: width 0.4s cubic-bezier(0.4,0,0.2,1);
}
.progress-text {
  font-size: 13px;
  font-weight: 700;
  color: var(--c-text-soft);
  white-space: nowrap;
}
.topbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
}
.combo-badge {
  background: linear-gradient(135deg, var(--c-danger), var(--c-warning));
  color: #fff;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
  animation: comboPulse 0.5s ease;
}
@keyframes comboPulse {
  0% { transform: scale(0.8); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}
.icon-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--c-bg-soft);
  border: none;
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-text);
  cursor: pointer;
  transition: all 0.2s;
  min-height: 40px;
}
.icon-btn:hover { background: var(--c-primary-light); color: #fff; transform: translateY(-1px); }
.icon-btn:active { transform: scale(0.95); }

/* ---------- 视图容器 ---------- */
#view-container {
  flex: 1;
  padding: 20px;
  animation: fadeIn 0.3s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.view { animation: fadeIn 0.3s ease; }

/* ---------- 通用区块 ---------- */
.section {
  background: var(--c-bg-card);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}
.section-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--c-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  border-radius: 999px;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  min-height: var(--tap);
  font-family: var(--font);
}
.btn:active { transform: scale(0.96); }
.btn-primary {
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
  color: #fff;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.btn-outline {
  background: var(--c-bg-card);
  color: var(--c-primary);
  border: 2px solid var(--c-primary-light);
}
.btn-outline:hover { background: var(--c-bg-soft); }
.btn-danger {
  background: linear-gradient(135deg, var(--c-danger), #ff8e8e);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-danger:hover { transform: translateY(-2px); }

/* ---------- 首页：档案列表 ---------- */
.profile-list {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: 12px;
}
.profile-card {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: var(--c-bg-soft);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  cursor: pointer;
  transition: all 0.2s;
  border: 3px solid transparent;
  min-width: 90px;
}
.profile-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); }
.profile-card.active {
  border-color: var(--c-primary);
  background: linear-gradient(135deg, rgba(108,92,231,0.08), rgba(162,155,254,0.08));
}
.pf-avatar { font-size: 32px; }
.pf-name { font-size: 14px; font-weight: 700; }
.pf-stars { font-size: 12px; color: var(--c-text-soft); }
.pf-actions { display: flex; gap: 4px; margin-top: 6px; }
.pf-action-btn {
  border: none;
  background: rgba(0,0,0,0.06);
  border-radius: var(--radius-sm);
  width: 26px; height: 26px;
  font-size: 13px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s;
  line-height: 1;
}
.pf-action-btn:hover { background: rgba(0,0,0,0.16); }
.pf-del-btn:hover { background: rgba(255,99,99,0.20); }

/* ---------- 首页：课文网格 ---------- */
.lesson-tools, .backup-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 16px; }
.lesson-tools-hint, .storage-hint { color: var(--c-text-soft); font-size: 13px; line-height: 1.6; }
.storage-hint { margin: 0 0 12px; }
.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.lesson-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: linear-gradient(135deg, var(--c-bg-card), var(--c-bg-soft));
  border-radius: var(--radius-md);
  padding: 16px;
  cursor: pointer;
  transition: all 0.25s;
  box-shadow: var(--shadow-sm);
  border: 2px solid transparent;
}
.lesson-card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-md);
  border-color: var(--c-primary-light);
}
.lesson-progress-ring {
  width: 56px; height: 56px;
  border-radius: 50%;
  flex-shrink: 0;
  background: conic-gradient(var(--c-primary) calc(var(--p,0) * 1%), var(--c-bg-soft) 0);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.lesson-progress-ring::before {
  content: '';
  position: absolute;
  inset: 5px;
  background: var(--c-bg-card);
  border-radius: 50%;
}
.ring-num {
  position: relative;
  font-size: 13px;
  font-weight: 800;
  color: var(--c-primary);
}
.lesson-info { flex: 1; min-width: 0; }
.lesson-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.lesson-meta { font-size: 12px; color: var(--c-text-soft); }

/* ---------- 首页：成就预览 ---------- */
.achievement-preview {
  display: flex;
  gap: 12px;
}
.ach-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: linear-gradient(135deg, var(--c-bg-soft), var(--c-bg-card));
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}
.ach-icon { font-size: 28px; }
.ach-num { font-size: 24px; font-weight: 800; color: var(--c-primary); }
.ach-label { font-size: 12px; color: var(--c-text-soft); }

/* ---------- 练习页 ---------- */
#view-practice {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.verse-panel {
  background: var(--c-bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: 18px 24px 16px;
}
.verse-label {
  color: var(--c-text-soft);
  font-size: 13px;
  text-align: center;
  margin-bottom: 10px;
}
.context-area {
  text-align: center;
  font-size: 28px;
  font-weight: 600;
  line-height: 1.9;
  min-height: 54px;
  overflow-wrap: anywhere;
}
.ctx-char {
  display: inline-block;
  padding: 0 2px;
  border-radius: 8px;
  transition: color 0.2s, background-color 0.2s;
}
.ctx-done { color: var(--c-success); }
.ctx-current {
  background: var(--c-primary);
  color: #fff;
  box-shadow: var(--shadow-md);
}
.ctx-skipped { opacity: 0.4; }

.current-char-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding-top: 10px;
  min-height: 98px;
}
.char-pinyin {
  font-size: 24px;
  font-weight: 700;
  color: var(--c-primary);
  letter-spacing: 2px;
}
.char-hanzi {
  font-size: 52px;
  font-weight: 800;
  color: var(--c-text);
  line-height: 1.1;
  animation: charBounce 0.4s ease;
}
@keyframes charBounce {
  0% { transform: scale(0.7); opacity: 0; }
  60% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}
.char-typed {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-success);
  letter-spacing: 3px;
  font-family: 'Courier New', monospace;
  min-height: 24px;
}
.error-hint {
  text-align: center;
  font-size: 16px;
  color: var(--c-danger);
  font-weight: 600;
  animation: shake 0.3s ease;
}
@keyframes shake {
  0%,100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

/* ---------- 模拟键盘 ---------- */
.keyboard-area {
  background: var(--c-bg-card);
  border-radius: var(--radius-lg);
  padding: 12px;
  box-shadow: var(--shadow-md);
}
.kb-row {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-bottom: 6px;
}
.kb-row:last-child { margin-bottom: 0; }
.kb-key {
  flex: 1;
  max-width: 64px;
  min-height: 50px;
  border: none;
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, #fff, var(--c-bg-soft));
  font-size: 20px;
  font-weight: 800;
  color: var(--c-text);
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: 0 2px 0 rgba(108,92,231,0.15), var(--shadow-sm);
  font-family: var(--font);
  touch-action: manipulation;
}
.kb-key:hover { transform: translateY(-2px); box-shadow: 0 4px 0 rgba(108,92,231,0.2), var(--shadow-md); }
.kb-key:active { transform: translateY(1px); box-shadow: 0 1px 0 rgba(108,92,231,0.15); }
.kb-target {
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
  color: #fff;
  animation: targetPulse 1.2s ease-in-out infinite;
  box-shadow: 0 0 0 4px rgba(108,92,231,0.25), var(--shadow-md);
}
@keyframes targetPulse {
  0%,100% { box-shadow: 0 0 0 4px rgba(108,92,231,0.25), var(--shadow-md); }
  50% { box-shadow: 0 0 0 8px rgba(108,92,231,0.15), var(--shadow-lg); }
}
.kb-correct {
  background: linear-gradient(135deg, var(--c-success), #00d4a8) !important;
  color: #fff !important;
  animation: correctFlash 0.35s ease;
}
@keyframes correctFlash {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}
.kb-error {
  background: linear-gradient(135deg, var(--c-danger), #ff8e8e) !important;
  color: #fff !important;
}
.kb-shake { animation: kbShake 0.4s ease; }
@keyframes kbShake {
  0%,100% { transform: translateX(0); }
  20% { transform: translateX(-8px) rotate(-3deg); }
  40% { transform: translateX(8px) rotate(3deg); }
  60% { transform: translateX(-6px) rotate(-2deg); }
  80% { transform: translateX(6px) rotate(2deg); }
}
.kb-hint {
  background: linear-gradient(135deg, var(--c-warning), var(--c-accent)) !important;
  color: var(--c-text) !important;
  animation: hintGlow 1s ease;
}
@keyframes hintGlow {
  0%,100% { box-shadow: 0 0 0 4px rgba(253,203,110,0.4); }
  50% { box-shadow: 0 0 0 12px rgba(253,203,110,0.2); }
}

/* ---------- 完成页 ---------- */
.complete-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 40px 24px;
  background: var(--c-bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  text-align: center;
}
.badge-pop {
  font-size: 80px;
  animation: badgeIn 0.6s cubic-bezier(0.34,1.56,0.64,1);
}
@keyframes badgeIn {
  0% { transform: scale(0) rotate(-180deg); opacity: 0; }
  60% { transform: scale(1.2) rotate(10deg); }
  100% { transform: scale(1) rotate(0); opacity: 1; }
}
.complete-title {
  font-size: 28px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.complete-stats {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}
.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: var(--c-bg-soft);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  min-width: 90px;
}
.stat-num { font-size: 24px; font-weight: 800; color: var(--c-primary); }
.stat-label { font-size: 12px; color: var(--c-text-soft); }
.accuracy-ring {
  width: 56px; height: 56px;
  transform: rotate(-90deg);
}
.accuracy-ring .ring-bg { fill: none; stroke: var(--c-bg-soft); stroke-width: 6; }
.accuracy-ring .ring-fg {
  fill: none;
  stroke: var(--c-success);
  stroke-width: 6;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.8s ease;
}
.complete-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

/* ---------- 报告页 ---------- */
.report-overview {
  display: flex;
  gap: 12px;
}
.report-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
  color: #fff;
  border-radius: var(--radius-md);
  padding: 18px;
  box-shadow: var(--shadow-md);
}
.report-num { font-size: 28px; font-weight: 800; }
.report-label { font-size: 12px; opacity: 0.9; }
.trend-chart {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  height: 160px;
  padding: 10px;
  background: var(--c-bg-soft);
  border-radius: var(--radius-md);
}
.trend-bar {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
  gap: 4px;
  position: relative;
}
.trend-fill {
  width: 100%;
  max-width: 40px;
  background: linear-gradient(180deg, var(--c-primary-light), var(--c-primary));
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: height 0.6s ease;
  min-height: 4px;
}
.trend-label { font-size: 11px; font-weight: 700; color: var(--c-primary); }
.trend-date { font-size: 10px; color: var(--c-text-soft); }
.reward-list { display: flex; flex-direction: column; gap: 8px; }
.reward-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--c-bg-soft);
  border-radius: var(--radius-md);
  padding: 12px 16px;
}
.rw-icon { font-size: 24px; }
.rw-label { flex: 1; font-weight: 600; }
.rw-val { font-weight: 800; color: var(--c-primary); }
.report-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- 设置页 ---------- */
.option-cards {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.option-card {
  flex: 1;
  min-width: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  background: var(--c-bg-soft);
  border: 3px solid transparent;
  border-radius: var(--radius-md);
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font);
}
.option-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.option-card.selected {
  border-color: var(--c-primary);
  background: linear-gradient(135deg, rgba(108,92,231,0.1), rgba(162,155,254,0.1));
}
.opt-icon { font-size: 28px; }
.opt-title { font-size: 14px; font-weight: 700; }
.opt-desc { font-size: 11px; color: var(--c-text-soft); text-align: center; }

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
}
.toggle { position: relative; width: 52px; height: 30px; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--c-bg-soft);
  border-radius: 999px;
  cursor: pointer;
  transition: 0.3s;
  border: 2px solid var(--c-primary-light);
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 22px; height: 22px;
  left: 3px; top: 50%;
  transform: translateY(-50%);
  background: var(--c-primary-light);
  border-radius: 50%;
  transition: 0.3s;
}
.toggle input:checked + .toggle-slider { background: var(--c-primary); }
.toggle input:checked + .toggle-slider::before { transform: translate(22px,-50%); background: #fff; }

/* ---------- 底部导航 ---------- */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-top: 1px solid rgba(108,92,231,0.08);
  z-index: 50;
}
.nav-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  background: none;
  border: none;
  padding: 10px;
  font-size: 20px;
  cursor: pointer;
  color: var(--c-text-soft);
  transition: all 0.2s;
  font-family: var(--font);
}
.nav-btn span { font-size: 11px; font-weight: 600; }
.nav-btn.active { color: var(--c-primary); }
.nav-btn.active span { font-weight: 800; }
.nav-btn:active { transform: scale(0.92); }

/* ---------- 模态弹窗 ---------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(45,52,54,0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
  animation: overlayIn 0.2s ease;
}
/* [hidden] 属性必须显式覆盖 display:flex/grid，否则隐藏的视图/弹窗仍会显示。
   用 !important 保证优先级高于任何 #id { display:flex } 声明（如 #view-practice）。 */
[hidden] { display: none !important; }
@keyframes overlayIn { from { opacity: 0; } to { opacity: 1; } }
.modal-card {
  background: var(--c-bg-card);
  border-radius: var(--radius-xl);
  padding: 28px 24px;
  max-width: 480px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.3s cubic-bezier(0.34,1.56,0.64,1);
}
.modal-card.modal-sm { max-width: 360px; }
@keyframes modalIn {
  from { transform: scale(0.8) translateY(20px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}
.modal-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--c-primary);
  text-align: center;
}
.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  justify-content: center;
  flex-wrap: wrap;
}
.confirm-msg {
  text-align: center;
  color: var(--c-text-soft);
  line-height: 1.6;
}

/* ---------- 多音字校对面板 ---------- */
.poly-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-height: 50vh;
  overflow-y: auto;
}
.poly-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px;
  background: var(--c-bg-soft);
  border-radius: var(--radius-md);
}
.poly-char {
  font-size: 36px;
  font-weight: 800;
  color: var(--c-primary);
  min-width: 50px;
  text-align: center;
}
.poly-candidates {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.poly-btn {
  background: var(--c-bg-card);
  border: 2px solid var(--c-bg-soft);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font);
  color: var(--c-text);
}
.poly-btn:hover { border-color: var(--c-primary-light); }
.poly-btn.selected {
  background: var(--c-primary);
  color: #fff;
  border-color: var(--c-primary);
}

/* ---------- 档案弹窗表单 ---------- */
.form-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.form-row > span { font-weight: 600; min-width: 50px; }
.form-row input[type=text] {
  flex: 1;
  padding: 12px 16px;
  border: 2px solid var(--c-bg-soft);
  border-radius: var(--radius-md);
  font-size: 16px;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.2s;
}
.form-row input[type=text]:focus { border-color: var(--c-primary); }
.avatar-picker {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  flex: 1;
}
.avatar-btn {
  width: 40px; height: 40px;
  border: 2px solid transparent;
  border-radius: 50%;
  background: var(--c-bg-soft);
  font-size: 20px;
  cursor: pointer;
  transition: all 0.2s;
}
.avatar-btn:hover { transform: scale(1.1); }
.avatar-btn.selected { border-color: var(--c-primary); background: rgba(108,92,231,0.1); }

/* ---------- 奖励浮层 ---------- */
.reward-overlay {
  position: fixed;
  top: 30%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 90;
  pointer-events: none;
}
.reward-overlay.show .reward-star,
.reward-overlay.show .reward-flower {
  animation: rewardFloat 0.8s ease forwards;
}
.reward-star, .reward-flower {
  font-size: 48px;
  display: inline-block;
}
@keyframes rewardFloat {
  0% { transform: scale(0) translateY(0); opacity: 0; }
  30% { transform: scale(1.3) translateY(-10px); opacity: 1; }
  100% { transform: scale(1) translateY(-60px); opacity: 0; }
}

/* ---------- 连击撒花 ---------- */
.confetti {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 95;
  overflow: hidden;
}
.confetti-piece {
  position: absolute;
  top: -10px;
  width: 10px; height: 14px;
  border-radius: 2px;
  animation: confettiFall linear forwards;
}
@keyframes confettiFall {
  0% { transform: translateY(0) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

/* ---------- 空状态提示 ---------- */
.loading-hint, .empty-hint {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--c-text-soft);
  padding: 30px;
  font-size: 14px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 600px) {
  .topbar { padding: 10px 12px; gap: 8px; }
  .topbar-left .logo { font-size: 18px; }
  .icon-btn { padding: 6px 10px; font-size: 13px; }
  .icon-btn span:not([id]) { display: none; }
  #current-name { display: none; }
  #view-container { padding: 12px; }
  .section { padding: 16px; }
  .char-hanzi { font-size: 44px; }
  .char-pinyin { font-size: 22px; }
  .verse-panel { padding: 14px 16px; }
  .context-area { font-size: 23px; line-height: 1.8; }
  .current-char-card { min-height: 90px; }
  .kb-key { min-height: 48px; font-size: 18px; max-width: 42px; }
  .lesson-grid { grid-template-columns: 1fr; }
  .complete-stats { gap: 8px; }
  .stat-item { min-width: 70px; padding: 12px; }
  .report-overview { flex-direction: column; }
  .option-cards { flex-direction: column; }
}

/* ---------- 打印优化 ---------- */
@media print {
  .topbar, .bottom-nav, .report-actions, .nav-btn { display: none !important; }
  #view-container { padding: 0; }
  .section { box-shadow: none; border: 1px solid #ddd; }
}