/* ============ 学习页布局 ============ */
.learn {
  padding-bottom: 40px;
}

.progressbar {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 6px 0 18px;
  padding: 14px 18px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: #eef0ff;
}

.progressbar .num {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.progressbar .track {
  flex: 1;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.18);
  overflow: hidden;
}

.progressbar .fill {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--brand-2), #a29bfe);
  transition: width 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.progressbar .stat {
  font-size: 13px;
  opacity: 0.85;
  white-space: nowrap;
}

/* ============ 翻页舞台 ============ */
.stage {
  perspective: 1600px;
}

.card {
  position: relative;
  background: var(--card);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 26px 26px 22px;
  transform-style: preserve-3d;
  transition: transform 0.42s cubic-bezier(0.55, 0.06, 0.35, 1), opacity 0.32s ease;
  will-change: transform, opacity;
}

.card.turning-out {
  transform: rotateY(-84deg) translateX(-6%);
  opacity: 0;
}

.card.turning-out-back {
  transform: rotateY(84deg) translateX(6%);
  opacity: 0;
}

.card.turning-in {
  transition: none;
  transform: rotateY(78deg) translateX(5%);
  opacity: 0;
}

.card.turning-in-back {
  transition: none;
  transform: rotateY(-78deg) translateX(-5%);
  opacity: 0;
}

.card.shake {
  animation: shake 0.42s cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

.card.pop {
  animation: pop 0.5s ease;
}

@keyframes shake {
  10%, 90% { transform: translateX(-3px); }
  20%, 80% { transform: translateX(6px); }
  30%, 50%, 70% { transform: translateX(-9px); }
  40%, 60% { transform: translateX(9px); }
}

@keyframes pop {
  0% { transform: scale(1); }
  40% { transform: scale(1.025); }
  100% { transform: scale(1); }
}

/* 卡片头部 */
.card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 6px;
}

.tag {
  font-size: 12px;
  font-weight: 700;
  color: var(--brand);
  background: #efecff;
  padding: 5px 11px;
  border-radius: 999px;
  letter-spacing: 0.5px;
}

.speak {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 8px 18px rgba(108, 92, 231, 0.35);
  transition: transform 0.15s, filter 0.2s;
}

.speak:hover {
  transform: translateY(-2px);
  filter: brightness(1.06);
}

.speak.playing .icon {
  animation: wave 0.7s ease-in-out infinite;
}

@keyframes wave {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.22); }
}

/* 中文释义 */
.meaning {
  margin: 10px 0 4px;
  font-size: clamp(30px, 6vw, 44px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 1px;
}

.phonetic {
  font-size: 16px;
  color: var(--ink-soft);
  letter-spacing: 0.5px;
  min-height: 22px;
}

.example {
  margin-top: 12px;
  padding: 11px 14px;
  border-left: 3px solid var(--brand-2);
  background: #f6fbfb;
  border-radius: 0 10px 10px 0;
  font-size: 14px;
  line-height: 1.7;
  color: #37536b;
}

.example[hidden] {
  display: none;
}

/* 例句中被星号隐藏的答案单词 */
.example .mask {
  color: #6f9cbd;
  font-weight: 800;
  letter-spacing: 2px;
  user-select: none;
}

/* 答对后揭晓的答案单词 */
.example b.ex-hit {
  color: var(--brand);
  font-weight: 800;
}

/* 答案槽位(输入框) */
.answer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin: 24px 0 6px;
  padding: 16px 12px;
  border-radius: 16px;
  background: #f7f8fd;
  border: 2px dashed #dcdff2;
  transition: border-color 0.25s, background 0.25s;
}

.answer.correct {
  border-color: var(--ok);
  border-style: solid;
  background: #eafaf5;
}

.answer.wrong {
  border-color: var(--bad);
  border-style: solid;
  background: #fdf1ef;
}

.slot {
  width: clamp(34px, 7.2vw, 46px);
  height: clamp(44px, 9vw, 56px);
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: #fff;
  border: 2px solid #e3e6f4;
  font-size: clamp(19px, 4.2vw, 25px);
  font-weight: 800;
  text-transform: lowercase;
  color: var(--ink);
  cursor: pointer;
  transition: transform 0.14s, border-color 0.2s, background 0.2s, color 0.2s;
  user-select: none;
}

.slot.empty {
  color: #c7ccdf;
  font-weight: 600;
}

.slot.active {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.14);
}

.slot.filled:hover {
  transform: translateY(-3px);
  border-color: #b9c0e6;
}

.slot.bad {
  border-color: var(--bad);
  background: #fdecea;
  color: var(--bad);
  animation: nudge 0.35s ease;
}

.slot.good {
  border-color: var(--ok);
  background: #e6f9f2;
  color: #00856a;
}

.slot.hinted {
  border-color: var(--warn);
  background: #fff8e6;
  color: #b8860b;
}

@keyframes nudge {
  0%, 100% { transform: translateY(0); }
  30% { transform: translateY(-5px); }
  60% { transform: translateY(2px); }
}

.answer-tip {
  margin: 8px 0 0;
  text-align: center;
  font-size: 12.5px;
  color: var(--ink-soft);
  min-height: 18px;
}

/* 反馈条 */
.feedback {
  margin-top: 12px;
  padding: 0;
  text-align: center;
  font-size: 15px;
  font-weight: 700;
  min-height: 22px;
  transition: color 0.2s;
}

.feedback.ok { color: var(--ok); }
.feedback.bad { color: var(--bad); }

/* 操作区 */
.actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 14px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

/* ============ 字母选项区(卡片内键盘区) ============ */
.bank {
  margin-top: 14px;
  padding: 14px 16px 16px;
  border-radius: 16px;
  background: linear-gradient(180deg, #262b52, #1b2040);
  border: 1px solid #303668;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.bank-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  color: #dfe2ff;
  font-size: 13.5px;
}

.bank-head .title {
  font-weight: 700;
  letter-spacing: 0.5px;
}

.bank-head .toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  opacity: 0.9;
  cursor: pointer;
}

.tiles {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.tile {
  width: clamp(44px, 9.4vw, 58px);
  height: clamp(48px, 10.4vw, 62px);
  border-radius: 13px;
  background: #fff;
  color: var(--ink);
  font-size: clamp(20px, 4.6vw, 26px);
  font-weight: 800;
  text-transform: lowercase;
  box-shadow: 0 5px 0 #cfD4ea, var(--shadow-soft);
  transition: transform 0.13s, box-shadow 0.13s, opacity 0.2s, background 0.2s;
  user-select: none;
}

.tile:hover:not(:disabled) {
  transform: translateY(-4px);
  box-shadow: 0 9px 0 #cfd4ea, 0 12px 22px rgba(0, 0, 0, 0.22);
  background: #f4f2ff;
}

.tile:active:not(:disabled) {
  transform: translateY(1px);
  box-shadow: 0 2px 0 #cfd4ea;
}

.tile.used {
  opacity: 0.22;
  box-shadow: none;
  transform: scale(0.92);
  cursor: default;
}

/* ============ 完成页 ============ */
.done {
  text-align: center;
  padding: 40px 24px 34px;
}

.done .trophy {
  font-size: 62px;
  display: block;
  margin-bottom: 8px;
  animation: float 2.4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-9px); }
}

.done h2 {
  margin: 4px 0 6px;
  font-size: 26px;
}

.done p {
  margin: 0 0 20px;
  color: var(--ink-soft);
}

.done .stats {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.done .stat-box {
  min-width: 108px;
  padding: 14px 16px;
  border-radius: 14px;
  background: #f6f7fd;
}

.done .stat-box b {
  display: block;
  font-size: 24px;
  color: var(--brand);
}

.done .stat-box span {
  font-size: 12.5px;
  color: var(--ink-soft);
}

.done .review {
  margin-top: 24px;
  text-align: left;
}

.done .review h3 {
  font-size: 15px;
  margin: 0 0 10px;
  color: var(--ink-soft);
}

.review-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 10px;
}

.review-item {
  padding: 11px 13px;
  border-radius: 12px;
  background: #f7f8fd;
  border-left: 3px solid var(--ok);
  font-size: 14px;
}

.review-item.miss {
  border-left-color: var(--bad);
  background: #fdf4f3;
}

.review-item b {
  display: block;
  font-size: 15.5px;
  letter-spacing: 0.4px;
}

.review-item span {
  color: var(--ink-soft);
  font-size: 13px;
}

/* ============ 响应式：手机一屏紧凑布局 ============ */
@media (max-width: 640px) {
  .wrap {
    width: calc(100% - 20px);
  }

  .learn {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
    padding-bottom: 10px;
  }

  .topbar {
    gap: 10px;
    padding: 10px 0 6px;
  }

  .brand {
    font-size: 16px;
  }

  .brand .logo {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    font-size: 15px;
  }

  .navlink {
    padding: 6px 10px;
    font-size: 12px;
  }

  .progressbar {
    gap: 10px;
    margin: 2px 0 8px;
    padding: 8px 12px;
    border-radius: 12px;
  }

  .progressbar .num {
    font-size: 12px;
  }

  .progressbar .track {
    height: 6px;
  }

  .progressbar .stat {
    display: none;
  }

  .card {
    padding: 12px 12px 10px;
    border-radius: 18px;
  }

  .card-head {
    gap: 8px;
    margin-bottom: 2px;
  }

  .tag {
    font-size: 11px;
    padding: 3px 9px;
  }

  .speak {
    gap: 5px;
    padding: 6px 12px;
    font-size: 12px;
  }

  .meaning {
    margin: 6px 0 0;
    font-size: clamp(22px, 6.6vw, 30px);
  }

  .phonetic {
    font-size: 13px;
    min-height: 17px;
  }

  .example {
    margin-top: 8px;
    padding: 7px 10px;
    font-size: 12px;
    line-height: 1.5;
  }

  .answer {
    gap: 6px;
    margin: 12px 0 2px;
    padding: 10px 6px;
    border-radius: 12px;
  }

  .slot {
    width: clamp(26px, 7.6vw, 36px);
    height: clamp(34px, 9.8vw, 46px);
    border-radius: 8px;
    font-size: clamp(16px, 4.8vw, 22px);
  }

  .answer-tip {
    margin: 5px 0 0;
    font-size: 11px;
    min-height: 15px;
  }

  .feedback {
    margin-top: 5px;
    font-size: 13px;
    min-height: 18px;
  }

  .bank {
    margin-top: 8px;
    padding: 8px 8px 10px;
    border-radius: 14px;
  }

  .bank-head {
    margin-bottom: 7px;
    font-size: 12px;
  }

  .bank-head .toggle {
    font-size: 11px;
  }

  .tiles {
    gap: 6px;
  }

  .tile {
    width: clamp(32px, 9.6vw, 42px);
    height: clamp(36px, 10.8vw, 46px);
    border-radius: 10px;
    font-size: clamp(16px, 4.8vw, 21px);
    box-shadow: 0 3px 0 #cfd4ea;
  }

  .tile:hover:not(:disabled) {
    box-shadow: 0 5px 0 #cfd4ea, 0 8px 16px rgba(0, 0, 0, 0.2);
  }

  .actions {
    gap: 6px;
    margin-top: 10px;
    padding-top: 10px;
  }

  .actions .btn {
    flex: 1;
    min-width: 0;
    padding: 9px 4px;
    border-radius: 10px;
    font-size: 12.5px;
  }

  .mode-btn {
    padding: 4px 10px;
    font-size: 12px;
  }

  .pad {
    height: 104px;
  }

  .hand-tip {
    font-size: 11px;
  }
}

.tiles[hidden] {
  display: none;
}

/* ---------- 输入方式切换 ---------- */
.mode-switch {
  display: flex;
  gap: 4px;
  padding: 3px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.14);
}

.mode-btn {
  padding: 5px 12px;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 600;
  color: #dfe2ff;
  transition: background 0.2s, color 0.2s;
}

.mode-btn.active {
  background: #fff;
  color: var(--ink);
}

/* ---------- 手写输入面板 ---------- */
.hand {
  margin-top: 2px;
}

.pad {
  display: block;
  width: 100%;
  height: 120px;
  border-radius: 12px;
  background: #fff;
  touch-action: none;
  cursor: crosshair;
}

.hand-ops {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.btn-light {
  background: #fff;
  color: var(--ink);
}

.btn-lightghost {
  background: rgba(255, 255, 255, 0.16);
  color: #e7e9ff;
}

.cands {
  display: flex;
  gap: 6px;
  margin-left: auto;
}

.cand {
  min-width: 34px;
  height: 34px;
  padding: 0 8px;
  border-radius: 9px;
  background: #fff;
  color: var(--ink);
  font-weight: 800;
  font-size: 16px;
}

.cand:first-child {
  outline: 2px solid var(--brand-2);
}

.hand-tip {
  margin: 7px 0 0;
  font-size: 11.5px;
  color: #aeb4dd;
}

/* ---------- 课本选择 ---------- */
.book-card {
  padding: 26px 24px 28px;
}

.book-title {
  margin: 0 0 6px;
  font-size: 24px;
  color: var(--ink);
}

.book-sub {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 13.5px;
}

.book-list {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
}

.book-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: flex-start;
  padding: 14px 16px;
  border-radius: 14px;
  background: linear-gradient(160deg, #f4f6ff, #e9edff);
  border: 1px solid #d8ddf6;
  text-align: left;
  transition: transform 0.15s, box-shadow 0.15s;
}

.book-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(64, 74, 158, 0.15);
}

.book-item b {
  font-size: 16px;
  color: var(--ink);
}

.book-item span {
  font-size: 12.5px;
  color: var(--muted);
}

.book-item.empty {
  opacity: 0.55;
}

.book-empty {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13.5px;
}

.book-chip {
  cursor: pointer;
  font-family: inherit;
}

.back-link {
  display: inline-block;
  margin: 0 0 12px;
  padding: 0;
  background: none;
  border: 0;
  color: #5a63c8;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.back-link:hover {
  text-decoration: underline;
}

/* ---------- 错题本 ---------- */
.mistake-count {
  display: inline-block;
  min-width: 18px;
  margin-left: 6px;
  padding: 1px 6px;
  border-radius: 999px;
  background: #ff5d5d;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  text-align: center;
}

.mistake-tools {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.mistake-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mistake-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  background: #fff5f5;
  border: 1px solid #ffd9d9;
}

.mi-body {
  flex: 1;
  min-width: 0;
}

.mi-w {
  font-size: 17px;
  font-weight: 700;
  color: #333;
}

.mi-w .p {
  margin-left: 6px;
  font-size: 13px;
  font-weight: 400;
  color: #8a8fa8;
}

.mi-m {
  margin-top: 2px;
  font-size: 14px;
  color: #555;
}

.mi-meta {
  margin-top: 4px;
  font-size: 12px;
  color: #b0565a;
}

.mi-ops {
  display: flex;
  gap: 6px;
}

.mi-btn {
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  font-size: 15px;
  cursor: pointer;
}

.mi-btn.danger {
  color: #d64545;
}