/* 沪词 P1 全局样式 —— 温和、清晰、适合长时间阅读 */

:root {
  --primary: #4a7c6f;
  --primary-hover: #3d665b;
  --primary-focus: rgba(74, 124, 111, 0.25);
  --secondary: #6b8cae;
  --accent: #e8a87c;
  --background: #f8f9f8;
  --surface: #ffffff;
  --muted: #7a8a84;
  --text: #2c3531;
  --success: #5a9b7c;
  --warning: #d4a056;
  --danger: #c86b6b;
  --radius: 1rem;
  --shadow: 0 4px 20px rgba(44, 53, 49, 0.08);
  --font-body: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  --font-display: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

/* Pico 主题变量覆盖（P2-6）：全站主色统一墨绿、二级按钮收敛中性灰绿。
   必须写在与 Pico 同优先级的 :root:not([data-theme="dark"]) 上——
   Pico 用该选择器定义变量，普通 :root 会被它压住（视觉实测 09-16）。 */
[data-theme="light"],
:root:not([data-theme="dark"]) {
  color-scheme: light;
  --pico-primary: var(--primary);
  --pico-primary-background: var(--primary);
  --pico-primary-border: var(--primary);
  --pico-primary-hover: var(--primary-hover);
  --pico-primary-hover-background: var(--primary-hover);
  --pico-primary-hover-border: var(--primary-hover);
  --pico-primary-focus: var(--primary-focus);
  --pico-primary-inverse: #ffffff;
  --pico-primary-underline: transparent;
  --pico-secondary: #e2e8e5;
  --pico-secondary-background: #e2e8e5;
  --pico-secondary-border: #d8e0dc;
  --pico-secondary-hover: #d3ded9;
  --pico-secondary-hover-background: #d3ded9;
  --pico-secondary-hover-border: #c8d5cf;
  --pico-secondary-inverse: var(--text);
  --pico-secondary-underline: transparent;
}

html,
body {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.7;
  background: var(--background);
  color: var(--text);
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.container {
  max-width: 720px;
  padding: 1.5rem 1rem;
}

/* 导航栏 */
.app-nav {
  background: var(--surface);
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-nav .nav-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.app-nav .brand {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.app-nav .nav-links {
  display: flex;
  gap: 1.25rem;
}

.app-nav .nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.app-nav .nav-links a:hover,
.app-nav .nav-links a[aria-current="page"] {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* 卡片 */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.card-title {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

/* 首页数字卡片 */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1rem;
  text-align: center;
  transition: transform 0.15s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
}

.stat-card .number {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}

.stat-card .label {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

.stat-card.mistake .number {
  color: var(--danger);
}

/* P2-8：错题为 0 时用中性色，避免无谓的紧张感 */
.stat-card.mistake.zero .number {
  color: var(--muted);
}

/* 按钮 */
button, .button {
  border-radius: 0.75rem;
  font-weight: 600;
}

button:disabled, .button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-large {
  width: 100%;
  padding: 1rem;
  font-size: 1.1rem;
}

/* 时间盒选择 */
.timebox-options {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 1rem;
}

.timebox-options label {
  flex: 1;
  max-width: 100px;
}

.timebox-options input[type="radio"] {
  position: absolute;
  opacity: 0;
}

.timebox-options .option-box {
  display: block;
  text-align: center;
  padding: 0.75rem 0.5rem;
  border: 2px solid #d5ddd9;
  border-radius: 0.75rem;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.timebox-options input:checked + .option-box {
  border-color: var(--primary);
  background: rgba(74, 124, 111, 0.08);
  color: var(--primary);
  font-weight: 600;
}

.pos-tag {
  font-size: 0.85em;
  color: var(--muted);
  margin-right: 0.35em;
}

/* 答后反馈卡（词条卡，阶层 C 批次 1）：首见/答错时展开，先测后教 */
.entry-card {
  margin-top: 1rem;
  border-left: 4px solid var(--primary);
}

.entry-head {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.entry-word {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text);
}

.entry-card .phonetic {
  font-size: 1.05rem;
  color: var(--muted);
  font-family: "Times New Roman", Georgia, serif;
}

.entry-meaning {
  font-size: 1.2rem;
  color: var(--primary);
  font-weight: 500;
  text-align: center;
  margin: 0.5rem 0 1rem;
  line-height: 1.6;
}

.entry-section {
  margin-top: 0.9rem;
}

.entry-label {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.entry-example {
  font-size: 0.95rem;
  line-height: 1.6;
  margin: 0.3rem 0;
}

.entry-trans {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
}

.entry-note {
  font-size: 0.92rem;
  line-height: 1.6;
  margin: 0.2rem 0;
}

/* 档3 例句挖空：中文整句译文棚架 */
.cloze-trans {
  margin-top: 0.5rem;
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.6;
}

/* 区块口径说明（T6：准确率等口径标注） */
.section-note {
  font-size: 0.82rem;
  color: var(--muted);
  margin: -0.25rem 0 0.75rem;
}

/* 档2 默写提示（词性 + 首字母 + 格数，09-13 拍板；serve 动态下发） */
.hint-letters {
  font-family: "Times New Roman", Georgia, serif;
  letter-spacing: 2px;
  color: var(--primary);
  font-weight: 600;
  margin-right: 0.35em;
}

.hint-blanks {
  color: var(--muted);
}

/* 专项训练入口（首页，stage1 独立于每日主线） */
.special-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.special-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 1rem 0.5rem;
  border: 1px solid #d8e0dc;
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.15s, transform 0.1s;
}

.special-btn:hover:not(:disabled) {
  border-color: var(--primary);
  transform: translateY(-1px);
}

.special-name {
  font-weight: 600;
}

.special-count {
  font-size: 0.85rem;
  color: var(--muted);
}

/* 进度条 */
.progress-track {
  height: 10px;
  background: #e2e8e5;
  border-radius: 999px;
  overflow: hidden;
  margin: 1rem 0 0.5rem;
}

.progress-fill {
  height: 100%;
  /* P2-11：单色（原"绿+蓝灰"双色无法对应任何一段，语义不明） */
  background: var(--primary);
  border-radius: 999px;
  transition: width 0.4s ease;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--muted);
}

/* 反馈 */
.feedback {
  padding: 1rem;
  border-radius: 0.75rem;
  margin: 1rem 0;
  text-align: center;
  font-weight: 500;
}

.feedback.correct {
  background: rgba(90, 155, 124, 0.12);
  color: #3d6651;
}

.feedback.incorrect {
  background: rgba(200, 107, 107, 0.12);
  color: #8b4545;
}

.feedback .answer-reveal {
  margin-top: 0.5rem;
  font-weight: 600;
  color: #8b4545;
}

/* 默写提示 */
.hint-box {
  padding: 1rem;
  margin: 1rem 0;
  border-radius: 0.75rem;
  background: rgba(74, 124, 111, 0.08);
  border-left: 4px solid var(--primary);
  color: var(--primary);
  text-align: center;
  font-weight: 500;
}

/* 错题本 */
.mistake-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mistake-item {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  margin-bottom: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
}

.mistake-item .word {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.mistake-item .meaning {
  color: var(--muted);
  flex: 1 1 100%;
}

.mistake-item .tag {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  font-size: 0.8rem;
  background: rgba(200, 107, 107, 0.12);
  color: var(--danger);
}

.mistake-item .meta {
  font-size: 0.8rem;
  color: var(--muted);
}

/* 进度页 */
.progress-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.progress-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  text-align: center;
}

.progress-card .value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}

.progress-card .label {
  font-size: 0.9rem;
  color: var(--muted);
}

.bar-chart {
  margin-top: 0.5rem;
}

.bar-row {
  display: flex;
  align-items: center;
  margin-bottom: 0.75rem;
}

.bar-label {
  width: 4rem;
  font-size: 0.9rem;
  color: var(--muted);
  flex-shrink: 0;
}

.bar-track {
  flex: 1;
  height: 1.25rem;
  background: #e2e8e5;
  border-radius: 999px;
  overflow: hidden;
  margin: 0 0.75rem;
}

.bar-fill {
  height: 100%;
  background: var(--danger);
  border-radius: 999px;
  transition: width 0.4s ease;
  opacity: 0.85;
}

.bar-value {
  width: 2rem;
  text-align: right;
  font-size: 0.9rem;
  color: var(--text);
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--muted);
}

.empty-state .icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.6;
}

/* 加载与错误 */
.loading, .error {
  text-align: center;
  padding: 3rem 1rem;
}

.error {
  color: var(--danger);
}

/* 响应式 */
@media (max-width: 480px) {
  html, body {
    font-size: 16px;
  }

  .container {
    padding: 1rem 0.75rem;
  }

  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .special-grid {
    grid-template-columns: 1fr;
  }

  .entry-word {
    font-size: 1.5rem;
  }
}

@media (min-width: 992px) {
  .container {
    max-width: 800px;
  }
}

/* ---- P4 新增：四段进度 + 选词点选 ---- */
.segment-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 0.75rem 0 0.5rem;
}

.segment-chip {
  font-size: 0.85rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: var(--muted-bg, #eee);
  color: var(--muted, #666);
  white-space: nowrap;
}

.segment-chip.active {
  background: var(--primary, #41729e);
  color: #fff;
  font-weight: 600;
}

.choice-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

@media (max-width: 600px) {
  .choice-grid {
    grid-template-columns: 1fr;
  }
}

.choice-btn {
  padding: 1rem 1.1rem;
  font-size: 1.05rem;
  text-align: left;
  border-radius: 0.5rem;
  white-space: normal;
  line-height: 1.5;
  /* P2-7：默认态降饱和（素雅风），三态语义见下 */
  background: var(--surface);
  border: 1px solid #d8e0dc;
  color: var(--text);
}

.choice-btn:hover:not(:disabled) {
  border-color: var(--primary);
}

/* P2-7 三态：你选错的=红边+删除线；正确答案=实心墨绿白字；其余（没碰过的）=淡化灰 */
.choice-btn.wrong {
  border: 1px solid var(--danger);
  color: #8b4545;
  text-decoration: line-through;
  background: transparent;
}

.choice-btn.revealed {
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #ffffff;
  font-weight: 600;
}

.choice-btn:disabled:not(.wrong):not(.revealed) {
  opacity: 0.5;
}

/* Pico 对 disabled 按钮统一加透明度，会把"正确答案/已选错"两态冲淡（视觉实测 09-16）→ 还原 */
.choice-btn:disabled.wrong,
.choice-btn:disabled.revealed {
  opacity: 1;
}

/* ---------------------------------------------------------------------------
   练习页布局（2026-10-20）：桌面题目 + 词条卡双栏，反馈/下一题在题目右上角。
   单列时内容保持 760px 阅读宽度；出现词条卡后桌面扩到 1120px 两栏。
   --------------------------------------------------------------------------- */
body.practice-page .container {
  max-width: 1120px;
}

body.practice-page .app-nav .nav-inner {
  max-width: 1120px;
}

.practice-layout {
  max-width: 760px;
  margin: 0 auto;
}

.practice-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  align-items: start;
}

.question-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.35rem;
}

.question-head .card-title {
  margin-bottom: 0;
}

.question-word {
  font-size: 1.75rem;
  line-height: 1.4;
  font-weight: 600;
  overflow-wrap: anywhere;
  margin-bottom: 1rem;
}

.question-word.is-sentence {
  font-size: 1.35rem;
  line-height: 1.6;
}

.question-word .question-meta {
  display: inline-flex;
  align-items: baseline;
  gap: 0.3rem;
  margin-left: 0.35rem;
  font-weight: 400;
  white-space: nowrap;
}

.question-word .phonetic {
  font-size: 0.95rem;
  color: var(--muted);
  font-family: "Times New Roman", Georgia, serif;
}

.question-word .pos-tag {
  font-size: 0.8rem;
  margin-right: 0;
}

.question-prompt {
  font-size: 1.3rem;
  line-height: 1.7;
  overflow-wrap: anywhere;
  margin-bottom: 0.75rem;
}

.question-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  padding-top: 0.15rem;
}

.answer-chip {
  display: inline-flex;
  align-items: center;
  min-height: 2.4rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 600;
  white-space: nowrap;
}

.answer-chip.correct {
  background: rgba(90, 155, 124, 0.14);
  color: #3d6651;
}

.answer-chip.incorrect {
  background: rgba(200, 107, 107, 0.14);
  color: #8b4545;
}

.btn-next {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.4rem;
  padding: 0.5rem 0.9rem;
  border: 0;
  border-radius: 0.65rem;
  background: var(--primary);
  color: #ffffff;
  font-size: 0.92rem;
  font-weight: 600;
  white-space: nowrap;
  width: auto;
  margin: 0;
}

.btn-next:hover {
  background: var(--primary-hover);
}

.answer-reveal-line {
  margin: 0.75rem 0 0;
  color: var(--danger);
  font-size: 0.92rem;
  font-weight: 600;
  text-align: center;
}

.practice-side {
  min-width: 0;
}

.practice-side .entry-card {
  margin-top: 0;
}

.practice-side .entry-head {
  justify-content: flex-start;
}

.practice-side .entry-meaning {
  text-align: left;
}

.summary-card {
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

/* 档2/档3 首字母遮罩：保留空格，字母/下划线可读 */
.hint-mask {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.08em;
  white-space: pre-wrap;
}

.cloze-hint {
  margin-top: 0.4rem;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ---------------------------------------------------------------------------
   内嵌字母键盘（2026-10-21）：档2 默写 / 档3 例句挖空共用。
   字母格按 hint_mask 渲染固定首字母与空格，输入实时回显；下方屏幕键盘
   不唤出系统输入法，避免联想提示代替回忆。
   --------------------------------------------------------------------------- */
.letter-keyboard {
  margin-top: 0.55rem;
}

.letter-cells {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: center;
  gap: 3px;
  min-height: 2.4rem;
  padding: 0 0.25rem;
}

.letter-cell {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: clamp(1.1rem, 4.4vw, 2rem);
  height: 2.3rem;
  border-bottom: 2px solid #d8e0dc;
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: clamp(1.05rem, 3.4vw, 1.45rem);
  font-weight: 600;
  line-height: 1;
}

.letter-cell.is-hint {
  color: var(--muted);
  border-bottom-color: var(--muted);
}

.letter-cell.is-active {
  border-bottom-color: var(--primary);
}

.letter-cell.is-filled {
  color: var(--primary);
}

.letter-cell.letter-gap {
  width: 0.55rem;
  border-bottom: 0;
}

.letter-cell.letter-sep {
  width: 0.9rem;
  border-bottom: 0;
  color: var(--muted);
}

.keyboard-caption {
  margin-top: 0.2rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.2;
}

.onscreen-keyboard {
  margin-top: 0.6rem;
  padding: 0.55rem 0.45rem 0.55rem;
  border-radius: 1.1rem 1.1rem 0.6rem 0.6rem;
  background: #e6ece9;
}

.keyboard-row {
  display: grid;
  gap: 5px;
  margin-bottom: 5px;
}

.keyboard-row.row-10 {
  grid-template-columns: repeat(10, 1fr);
}

.keyboard-row.row-9 {
  grid-template-columns: repeat(9, 1fr);
  padding: 0 0.9rem;
}

.keyboard-row.row-7 {
  grid-template-columns: repeat(7, 1fr) 1.35fr;
  margin-bottom: 0;
}

.keyboard-row .key-btn {
  width: 100%;
  min-height: 2.2rem;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0.45rem;
  background: var(--surface);
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1;
  box-shadow: 0 2px 0 rgba(44, 53, 49, 0.12);
}

.keyboard-row .key-btn:active {
  transform: translateY(1px);
  box-shadow: none;
}

.keyboard-row .key-btn:disabled {
  opacity: 0.55;
}

.keyboard-row .key-back {
  font-size: 0.95rem;
}

.keyboard-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 0.35rem;
  padding: 0 0.5rem;
}

.keyboard-actions .skip-btn {
  width: auto;
  margin: 0;
  padding: 0.4rem 0.25rem;
  border: 0;
  background: transparent;
  color: var(--danger);
  font-size: 0.9rem;
  font-weight: 600;
}

.keyboard-actions .confirm-btn {
  width: auto;
  min-width: 8rem;
  min-height: 2.2rem;
  margin: 0;
  padding: 0 1.25rem;
  border: 0;
  border-radius: 0.6rem;
  background: var(--primary);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 600;
}

.keyboard-actions .confirm-btn:disabled {
  background: #d5dedb;
  color: var(--muted);
  opacity: 1;
}

@media (max-width: 480px) {
  .onscreen-keyboard {
    padding-left: 0.3rem;
    padding-right: 0.3rem;
  }

  .keyboard-row {
    gap: 4px;
  }

  .keyboard-row.row-9 {
    padding: 0 0.55rem;
  }

  .keyboard-row .key-btn {
    min-height: 2.35rem;
  }
}

@media (min-width: 1000px) {
  .practice-layout.has-entry {
    max-width: 1120px;
  }

  .practice-layout.has-entry .practice-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(320px, 1fr);
  }

  .practice-side {
    position: sticky;
    top: 5.5rem;
  }
}

@media (max-width: 900px) {
  body.practice-page .container,
  body.practice-page .app-nav .nav-inner {
    max-width: 720px;
  }
}

@media (max-width: 600px) {
  .question-head {
    flex-direction: column;
  }

  .question-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .question-word {
    font-size: 1.5rem;
  }

  .question-word.is-sentence {
    font-size: 1.25rem;
  }

  .question-word .phonetic {
    font-size: 0.9rem;
  }

  .question-word .pos-tag {
    font-size: 0.75rem;
  }

  .question-prompt {
    font-size: 1.15rem;
  }
}