/* ================================================================
   生词听写 PWA 应用 - 全局样式
   设计原则：儿童友好、大按钮、圆角、明亮柔和色彩
   ================================================================ */

/* ---------- CSS 变量 ---------- */
:root {
  --bg: #fdf6f0;
  --bg-gradient: linear-gradient(145deg, #fdf6f0 0%, #f5ead8 100%);
  --card-bg: rgba(255, 255, 255, 0.85);
  --card-border: #f0d5c8;
  --primary: #FF8FAB;
  --primary-dark: #e87a95;
  --primary-light: #ffd4e0;
  --accent: #FFD93D;
  --accent-dark: #f0c020;
  --text: #3f2a14;
  --text-secondary: #6a4f5a;
  --text-muted: #9a7a8a;
  --success: #6BCB77;
  --error: #FF6B6B;
  --warning: #FF9F43;
  --highlight: #d47a4a;
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
  --radius: 20px;
  --radius-lg: 30px;
  --radius-sm: 12px;
  --radius-xs: 8px;
  --font: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Comic Sans MS', cursive, sans-serif;
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  font-family: var(--font);
  background: var(--bg-gradient);
  min-height: 100vh;
  min-height: 100dvh;
  padding: 12px 16px 40px;
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 页面容器 ---------- */
.page-container {
  max-width: 720px;
  margin: 0 auto;
}

/* ================================================================
   导航栏
   ================================================================ */
.navbar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 60px;
  margin-bottom: 16px;
  border: 2px solid var(--card-border);
  box-shadow: var(--shadow);
  position: sticky;
  top: 10px;
  z-index: 100;
}

.navbar a {
  text-decoration: none;
  font-size: 1rem;
  font-weight: 700;
  padding: 10px 22px;
  border-radius: 40px;
  transition: all 0.3s ease;
  color: var(--text-secondary);
  background: transparent;
  border: 2px solid transparent;
  white-space: nowrap;
}

.navbar a:hover {
  background: #fdf0ec;
  transform: translateY(-2px);
}

.navbar a.active {
  background: var(--accent);
  color: #5a3f1a;
  border-color: var(--accent);
  box-shadow: 0 4px 14px rgba(255, 217, 61, 0.35);
}

.navbar a.active:hover {
  transform: translateY(-2px);
}

.navbar .nav-sep {
  color: #d0c0b8;
  font-weight: 300;
  font-size: 1.2rem;
}

/* ================================================================
   页面标题
   ================================================================ */
.page-header {
  text-align: center;
  padding: 8px 0 12px;
}

.page-header h1 {
  font-size: 2rem;
  color: #7b3f6b;
  text-shadow: 3px 3px 0 #f0c8d8;
  letter-spacing: 2px;
  margin-bottom: 4px;
}

.page-header .subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* ================================================================
   卡片容器
   ================================================================ */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: 20px 18px;
  border: 2px solid var(--card-border);
  box-shadow: var(--shadow);
  margin-bottom: 14px;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 12px;
  text-align: center;
}

/* ================================================================
   组别跳转控制区
   ================================================================ */
.group-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.group-controls input {
  width: 120px;
  padding: 10px 14px;
  border: 2px solid var(--card-border);
  border-radius: 40px;
  font-size: 1rem;
  font-family: var(--font);
  text-align: center;
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border-color 0.3s;
}

.group-controls input:focus {
  border-color: var(--primary);
}

.group-info {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--highlight);
  text-align: center;
  margin-top: 8px;
  min-height: 1.2em;
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 40px;
  border: 2px solid transparent;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: var(--font);
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
  user-select: none;
  -webkit-user-select: none;
  position: relative;
  overflow: hidden;
}

.btn:active {
  transform: scale(0.96);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 4px 0 var(--primary-dark);
}

.btn-primary:hover:not(:disabled) {
  background: #ff9db5;
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  box-shadow: 0 1px 0 var(--primary-dark);
  transform: translateY(2px);
}

.btn-accent {
  background: var(--accent);
  color: #5a3f1a;
  border-color: var(--accent);
  box-shadow: 0 4px 0 var(--accent-dark);
}

.btn-accent:hover:not(:disabled) {
  background: #ffe566;
  transform: translateY(-1px);
}

.btn-accent:active:not(:disabled) {
  box-shadow: 0 1px 0 var(--accent-dark);
  transform: translateY(2px);
}

.btn-outline {
  background: #fff;
  color: var(--text-secondary);
  border-color: #dbb5a8;
  box-shadow: 0 3px 0 #d0b8a8;
}

.btn-outline:hover:not(:disabled) {
  background: #fdf0ec;
  transform: translateY(-1px);
}

.btn-outline:active:not(:disabled) {
  box-shadow: 0 1px 0 #d0b8a8;
  transform: translateY(2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.5);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 14px 32px;
  font-size: 1.15rem;
  border-radius: 50px;
}

/* ---------- 喇叭按钮 ---------- */
.speaker-btn {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, #FFD93D, #FFA940);
  border: 3px solid #f0c020;
  font-size: 2.2rem;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 6px 0 #d49a20, 0 8px 20px rgba(255, 169, 64, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
}

.speaker-btn:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 8px 0 #d49a20, 0 12px 25px rgba(255, 169, 64, 0.4);
}

.speaker-btn:active {
  transform: translateY(3px);
  box-shadow: 0 2px 0 #d49a20, 0 4px 10px rgba(255, 169, 64, 0.3);
}

.speaker-btn.speaking {
  animation: speaker-pulse 0.6s ease-in-out infinite;
}

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

/* ================================================================
   学习区
   ================================================================ */
.study-area {
  text-align: center;
}

.study-area .word-display {
  font-size: 2.8rem;
  font-weight: 800;
  color: #7b3f6b;
  margin: 10px 0;
  min-height: 1.5em;
  text-shadow: 2px 2px 0 #f0c8d8;
  letter-spacing: 4px;
}

.study-area .word-info {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin: 10px 0;
  padding: 12px 16px;
  background: #fdf6ee;
  border-radius: var(--radius);
  display: none;
}

.study-area .word-info.show {
  display: block;
  animation: fadeInUp 0.4s ease;
}

.study-area .word-info .pinyin {
  color: var(--primary);
  font-weight: 600;
}

.study-area .word-info .explain {
  color: var(--text-secondary);
}

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

/* ---------- 答题输入区 ---------- */
.answer-area {
  margin: 16px 0;
}

.answer-area input {
  width: 100%;
  max-width: 340px;
  padding: 14px 18px;
  border: 3px solid var(--card-border);
  border-radius: 50px;
  font-size: 1.2rem;
  font-family: var(--font);
  text-align: center;
  background: #fff;
  color: var(--text);
  outline: none;
  transition: border-color 0.3s;
  letter-spacing: 2px;
}

.answer-area input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(255, 143, 171, 0.15);
}

/* ---------- 提交按钮区域 ---------- */
.submit-area {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 16px 0;
}

/* ---------- 4秒倒计时样式 ---------- */
.countdown-badge {
  display: inline-block;
  background: var(--error);
  color: #fff;
  border-radius: 50%;
  width: 26px;
  height: 26px;
  line-height: 26px;
  font-size: 0.8rem;
  font-weight: 700;
  text-align: center;
}

/* ================================================================
   反馈区
   ================================================================ */
.feedback {
  font-size: 1.2rem;
  font-weight: 700;
  min-height: 2em;
  padding: 8px;
  text-align: center;
  transition: all 0.3s;
}

.feedback.correct {
  color: var(--success);
  animation: popIn 0.4s ease;
}

.feedback.wrong {
  color: var(--error);
  animation: shake 0.5s ease;
}

.feedback.info {
  color: var(--text-secondary);
}

@keyframes popIn {
  0% { transform: scale(0.5); opacity: 0; }
  70% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
}

/* ================================================================
   进度条
   ================================================================ */
.progress-section {
  margin-bottom: 6px;
}

.progress-bar-wrap {
  width: 100%;
  height: 14px;
  background: #e8ddd0;
  border-radius: 20px;
  overflow: hidden;
  margin: 6px 0;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #FFD93D, #FFA940);
  border-radius: 20px;
  transition: width 0.5s ease;
}

.progress-text {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.progress-text .correct-count {
  color: var(--success);
}

/* ================================================================
   下一个按钮
   ================================================================ */
.next-btn-wrap {
  text-align: center;
  margin-top: 8px;
}

/* ================================================================
   弹窗/覆盖层
   ================================================================ */
.overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.overlay.show {
  display: flex;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.dialog {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  max-width: 340px;
  width: 90%;
  box-shadow: var(--shadow-lg);
  animation: popIn 0.35s ease;
}

.dialog h3 {
  font-size: 1.3rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.dialog p {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 18px;
  line-height: 1.6;
}

.dialog .dialog-btns {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ================================================================
   错题列表
   ================================================================ */
.wrong-list-section {
  display: none;
  margin-top: 8px;
}

.wrong-list-section.show {
  display: block;
  animation: fadeInUp 0.4s ease;
}

.wrong-list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  font-weight: 700;
  color: var(--text-secondary);
  font-size: 1rem;
  flex-wrap: wrap;
  gap: 8px;
}

.wrong-list-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 4px;
  background: #fdf6ee;
  border-bottom: 1px solid #f0e0d0;
  transition: background 0.2s;
  flex-wrap: wrap;
}

.wrong-list-item:hover {
  background: #fdf0e8;
}

.wrong-list-item .wl-index {
  font-weight: 700;
  color: var(--text-muted);
  min-width: 28px;
}

.wrong-list-item .wl-info {
  flex: 1;
  font-weight: 600;
  color: var(--text);
  min-width: 120px;
}

.wrong-list-item .wl-count {
  font-weight: 700;
  color: var(--success);
  white-space: nowrap;
}

.wrong-list-item .wl-del {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--error);
  padding: 4px 8px;
  border-radius: 50%;
  transition: background 0.2s;
}

.wrong-list-item .wl-del:hover {
  background: #ffe8e8;
}

/* ---------- 分页 ---------- */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.pagination .page-btn {
  min-width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--card-border);
  background: #fff;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.9rem;
  transition: all 0.2s;
}

.pagination .page-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.pagination .page-btn:hover:not(.active):not(:disabled) {
  background: #fdf0ec;
}

.pagination .page-nav {
  padding: 0 12px;
  border-radius: 20px;
}

/* ================================================================
   排行榜
   ================================================================ */

/* Tab切换 */
.rank-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.rank-tab {
  padding: 10px 32px;
  border-radius: 40px;
  border: 3px solid #dbb5a8;
  background: #fdf0e8;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s;
  font-family: var(--font);
  box-shadow: 0 3px 0 #c0a098;
}

.rank-tab:active {
  transform: translateY(3px);
  box-shadow: 0 0px 0 #c0a098;
}

.rank-tab.active {
  background: var(--accent);
  border-color: var(--accent-dark);
  box-shadow: 0 1px 0 #c0a098;
  transform: translateY(2px);
}

/* 排行榜列表 */
.rank-list {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  border: 2px solid var(--card-border);
  min-height: 300px;
}

.rank-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 16px;
  margin-bottom: 3px;
  transition: background 0.2s;
  border-bottom: 1px solid #f5ede8;
}

.rank-item:last-child {
  border-bottom: none;
}

.rank-item .rank-num {
  font-size: 1.1rem;
  font-weight: 700;
  color: #9a8a8a;
  min-width: 36px;
  text-align: center;
}

.rank-item .rank-num.top1 { color: #FFD93D; font-size: 1.4rem; }
.rank-item .rank-num.top2 { color: #C0C0C0; font-size: 1.3rem; }
.rank-item .rank-num.top3 { color: #CD7F32; font-size: 1.2rem; }

.rank-item .rank-name {
  flex: 1;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.rank-item .rank-name .badge {
  font-size: 0.7rem;
  background: #ffd93d;
  padding: 1px 10px;
  border-radius: 20px;
  margin-left: 8px;
  font-weight: 700;
}

.rank-item .rank-flowers {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--highlight);
}

/* 本人高亮 */
.rank-item.is-me {
  background: linear-gradient(145deg, #fff8f0, #fdf0e2);
  border: 2px solid #ffd93d;
  border-radius: 16px;
  padding: 10px 14px;
  box-shadow: 0 0 20px rgba(255, 217, 61, 0.2);
}

.rank-item.is-me .rank-name {
  color: var(--highlight);
}

.rank-item.is-me .me-badge {
  font-size: 0.7rem;
  background: #ff6b8a;
  color: #fff;
  padding: 1px 12px;
  border-radius: 20px;
  margin-left: 8px;
  font-weight: 700;
}

/* 用户数据卡片 */
.user-data-card {
  background: linear-gradient(135deg, #fff5f8, #fdf0f5);
  border: 2px solid #f0d0d8;
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  margin-bottom: 14px;
  text-align: center;
}

.user-data-card .user-data-header {
  font-weight: 700;
  color: var(--highlight);
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.user-data-grid {
  display: flex;
  justify-content: center;
  gap: 16px 20px;
  flex-wrap: wrap;
}

.user-data-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.user-data-item .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.user-data-item .value {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--highlight);
}

/* 底部统计 */
.bottom-stats {
  margin-top: 14px;
  background: rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  border: 2px solid var(--card-border);
  text-align: center;
}

.bottom-stats .stat-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 600;
  line-height: 1.6;
}

.bottom-stats .highlight {
  color: var(--primary);
  font-weight: 800;
}

/* ================================================================
   Toast 提示
   ================================================================ */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(50, 40, 45, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: #fff;
  padding: 12px 28px;
  border-radius: 60px;
  font-size: 1rem;
  font-weight: 600;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
  z-index: 9999;
  animation: toast-in 0.4s ease-out;
  max-width: 90%;
  text-align: center;
  white-space: nowrap;
}

.toast.hidden {
  display: none;
}

@keyframes toast-in {
  0% { transform: translateX(-50%) translateY(30px) scale(0.9); opacity: 0; }
  100% { transform: translateX(-50%) translateY(0) scale(1); opacity: 1; }
}

/* ================================================================
   🎉 毕业提示特效
   ================================================================ */
.graduate-flash {
  animation: graduate-glow 0.8s ease-in-out 3;
}

@keyframes graduate-glow {
  0%, 100% { box-shadow: 0 0 0px rgba(107, 203, 119, 0); }
  50% { box-shadow: 0 0 30px rgba(107, 203, 119, 0.6), 0 0 60px rgba(107, 203, 119, 0.3); }
}

/* ================================================================
   空状态
   ================================================================ */
.empty-state {
  text-align: center;
  padding: 30px 20px;
  color: var(--text-muted);
  font-size: 1.1rem;
  line-height: 1.8;
}

.empty-state .empty-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: 10px;
}

/* ================================================================
   加载状态
   ================================================================ */
.loading {
  text-align: center;
  padding: 40px 20px;
  color: #b0a09a;
  font-size: 1.1rem;
}

.loading .spinner {
  display: inline-block;
  animation: spin 1s linear infinite;
  font-size: 2rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ================================================================
   成功/错误闪烁效果
   ================================================================ */
.correct-flash {
  animation: correct-glow 0.6s ease;
}

@keyframes correct-glow {
  0%, 100% { background: transparent; }
  50% { background: rgba(107, 203, 119, 0.15); }
}

.wrong-flash {
  animation: wrong-shake 0.5s ease;
}

@keyframes wrong-shake {
  0%, 100% { background: transparent; }
  50% { background: rgba(255, 107, 107, 0.1); }
}

/* ================================================================
   响应式设计
   ================================================================ */
@media (max-width: 650px) {
  .navbar a { font-size: 0.8rem; padding: 7px 13px; }
  .page-header h1 { font-size: 1.5rem; }
  .speaker-btn { width: 66px; height: 66px; font-size: 1.8rem; }
  .study-area .word-display { font-size: 2.2rem; }
  .btn { font-size: 0.85rem; padding: 8px 16px; }
  .btn-lg { font-size: 1rem; padding: 12px 24px; }
  .rank-tab { font-size: 0.85rem; padding: 8px 18px; }
  .rank-item { padding: 8px 10px; gap: 8px; }
  .rank-item .rank-name { font-size: 0.9rem; }
  .rank-item .rank-flowers { font-size: 0.95rem; }
  .group-controls input { width: 100px; }
  .card { padding: 16px 12px; }
  .user-data-item .value { font-size: 1.1rem; }
}

@media (max-width: 400px) {
  body { padding: 8px 8px 30px; }
  .navbar a { font-size: 0.7rem; padding: 6px 10px; }
  .page-header h1 { font-size: 1.2rem; }
  .speaker-btn { width: 56px; height: 56px; font-size: 1.5rem; }
  .study-area .word-display { font-size: 1.8rem; }
  .submit-area { flex-direction: column; align-items: center; }
  .rank-item { flex-wrap: wrap; gap: 4px; }
  .rank-item .rank-name { flex-basis: 100%; }
  .group-controls { gap: 4px; }
  .group-controls input { width: 80px; font-size: 0.85rem; }
  .dialog { padding: 20px 16px; }
  .pagination .page-btn { min-width: 30px; height: 30px; font-size: 0.8rem; }
  .wrong-list-item { font-size: 0.85rem; padding: 8px 10px; }
}

/* ================================================================
   打印隐藏（PWA不需要）
   ================================================================ */
@media print {
  .navbar, .toast, .overlay { display: none !important; }
}