:root {
  --bg: #fbf7f1;
  --card: #ffffff;
  --ink: #2d2724;
  --muted: #7e6d66;
  --shadow: 0 14px 32px rgba(90, 68, 52, 0.12);

  --theme-1a: #6BA892;
  --theme-1a-soft: #e9f5ef;
  --theme-1a-dark: #356b58;

  --theme-1b: #6F8FC7;
  --theme-1b-soft: #edf3ff;
  --theme-1b-dark: #3f5f9a;

  --theme-1c: #D88A63;
  --theme-1c-soft: #fff0e8;
  --theme-1c-dark: #8f4f32;

  --active-color: var(--theme-1a);
  --active-soft: var(--theme-1a-soft);
  --active-dark: var(--theme-1a-dark);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(107,168,146,.18), transparent 30%),
    radial-gradient(circle at top right, rgba(111,143,199,.16), transparent 28%),
    radial-gradient(circle at 50% 0%, rgba(216,138,99,.14), transparent 40%),
    linear-gradient(180deg, #fffdf9 0%, var(--bg) 100%);
  color: var(--ink);
  min-height: 100vh;
  line-height: 1.6;
}

.hidden {
  display: none !important;
}

.page {
  width: min(96vw, 1800px);
  max-width: none;
  margin: 0 auto;
  padding: 34px 24px 50px;
}

/* ===================== Home Hero ===================== */
.hero,
.lesson-hero {
  position: relative;
  overflow: hidden;
  border-radius: 34px;
  padding: 18px 26px;
  box-shadow: var(--shadow);
  border: 1px solid rgba(90, 68, 52, 0.08);
  text-align: center;
}

.hero {
  position: relative;
  background: linear-gradient(135deg, #f2fbf6 0%, #eef4ff 46%, #fff0e8 100%);
}

.hero::after {
  content: "读 · 听 · 说";
  position: absolute;
  right: 28px;
  bottom: 18px;
  color: rgba(90,68,52,.10);
  font-size: 58px;
  font-weight: 900;
  letter-spacing: 8px;
  pointer-events: none;
}

.lesson-hero {
  margin-top: 8px;
}

.brand-tag {
  display: inline-block;
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,.68);
  color: #5f514a;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 14px;
  box-shadow: 0 4px 12px rgba(90,68,52,.08);
}

h1 {
  margin: 0;
  color: #4b3b35;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.08;
  letter-spacing: 0.5px;
  font-weight: 900;
  text-shadow: 0 1px 0 rgba(255,255,255,.9);
}

.subtitle {
  margin: 16px auto 0;
  max-width: 760px;
  color: #6b5b54;
  font-size: 17px;
  line-height: 1.7;
}

/* ===================== Buttons / Toolbars ===================== */
.toolbar,
.top-nav,
.reading-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}
#bookFilters {
  justify-content: center;
  margin: 22px 0 26px;
}
#bookFilters button {
  min-width: 66px;
}

.toolbar,
.top-nav {
  margin: 16px 0;
}

#lessonToolbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(251,247,241,.88);
  backdrop-filter: blur(8px);
  padding: 12px 0;
}

button {
  border: 0;
  cursor: pointer;
  padding: 10px 16px;
  border-radius: 999px;
  background: #fff;
  color: #5f514a;
  font-size: 15px;
  font-weight: 800;
  box-shadow: 0 6px 14px rgba(90,68,52,.10);
  transition: .2s ease;
}

button:hover {
  transform: translateY(-2px);
}

button.active {
  background: var(--active-color, #4d3b35);
  color: #fff;
}

#bookFilters button.active {
  background: #4d3b35;
  color: #fff;
}

/* ===================== Home Book Sections ===================== */
.book-section {
  margin-top: 28px;
  background: rgba(255,255,255,.92);
  border-radius: 30px;
  padding: 24px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.book-section .section-title {
  border-bottom: 1px solid rgba(90,68,52,.08);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-size: 26px;
  color: var(--active-dark, #356b58);
}

.lesson-grid,
.key-grid,
.practice-grid {
  display: grid;
  gap: 16px;
}

.lesson-grid {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.key-grid {
  grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
}

.practice-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.lesson-card {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 20px;
  min-height: 185px;
  transition: .22s ease;
  position: relative;
  overflow: hidden;
  background: rgba(255,255,255,.94);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.lesson-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 24px rgba(90,68,52,.14);
}

.lesson-number,
.status {
  display: inline-block;
  border-radius: 999px;
  font-weight: 800;
}

.lesson-number {
  padding: 5px 10px;
  font-size: 13px;
  margin-bottom: 12px;
}

.status {
  margin-top: 14px;
  padding: 5px 9px;
  font-size: 12px;
}

.lesson-title {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 12px;
  color: #493730;
}

.lesson-pinyin {
  color: #9a8f89;
  font-size: 15px;
  margin-bottom: 0;
  font-weight: 500;
}

.lesson-desc {
  color: #735c54;
  font-size: 14px;
  line-height: 1.6;
  max-width: 86%;
}

.teacher-note {
  margin-top: 24px;
  padding: 18px 20px;
  border-radius: 22px;
  background: rgba(255,255,255,.78);
  color: #6a5a52;
  line-height: 1.8;
  font-size: 15px;
  box-shadow: 0 8px 20px rgba(90,68,52,.08);
  border: 1px solid rgba(90,68,52,.08);
}

/* ===================== Lesson Common Layout ===================== */
.card {
  background: rgba(255,255,255,.94);
  border: 1px solid rgba(90,68,52,.08);
  border-radius: 26px;
  padding: 24px;
  box-shadow: var(--shadow);
  margin-top: 20px;
}

.student-tip {
  color: #657a70;
  font-size: 15px;
  margin-top: 0;
}

.translation {
  margin-top: 8px;
  padding: 8px 12px;
  border-radius: 14px;
  background: var(--active-soft, #eef8f3);
  color: var(--active-dark, #385f51);
  font-size: 16px;
}

/* ===================== Key Words ===================== */
.key-card {
  background: rgba(255,255,255,.86);
  border: 1px solid rgba(90,68,52,.08);
  border-radius: 18px;
  padding: 12px;
  text-align: center;
  cursor: pointer;
  transition: .2s ease;
  min-height: 128px;
  box-shadow: 0 6px 14px rgba(90,68,52,.06);
}

.key-card:hover,
.sentence-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(90,68,52,.12);
}

.emoji {
  font-size: 28px;
  display: block;
}

.hanzi {
  font-size: 26px;
  font-weight: 900;
  margin-top: 4px;
}

.small-pinyin {
  color: var(--muted);
  font-size: 20px;
  margin-top: 2px;
}

/* ===================== Key Sentences ===================== */
.sentence-bank {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 18px;
}

.sentence-card {
  background: linear-gradient(180deg, #fff, rgba(255,255,255,.72));
  border: 1px dashed rgba(90,68,52,.16);
  border-radius: 20px;
  padding: 14px 18px;
  cursor: pointer;
  overflow-x: auto;
  transition: .2s ease;
}

.sentence-card .line {
  flex-wrap: nowrap;
  margin: 4px 0;
  gap: 6px 9px;
}

.sentence-card .token-pinyin {
  font-size: 16px;
}

.sentence-card .token-hanzi,
.sentence-card .punct {
  font-size: 30px;
}

.sentence-card .token {
  min-width: 36px;
}

/* ===================== Token System ===================== */
.line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: flex-end;
  margin: 18px 0;
}

.token {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  min-width: 48px;
}

.token-pinyin {
  font-size: clamp(17px, 2vw, 26px);
  line-height: 1.1;
  color: #66766f;
  font-weight: 700;
  margin-bottom: 4px;
  white-space: nowrap;
}

.token-hanzi {
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.08;
  font-weight: 900;
  white-space: nowrap;
}

.punct {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 900;
  line-height: 1.08;
  margin-left: -8px;
}

.pause {
  color: #9aaaa2;
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 500;
  align-self: flex-end;
  padding-bottom: 4px;
}

/* =====================
   Semantic Token Colors
   山水蓝绿系：柔和、统一、适合投屏
===================== */

/* 人物 / 主语 */
.self,
.person,
.speaker {
  color: #3f6f8f;
}


/* 动作 / 判断 */
.activity {
  color: #7a6a3a;
}

/* 名字 */
.name {
  color: #6b5f8f;
}

/* 地点 / 国家 */
.place,
.country,
.location {
  color: #4f7f68;
}

/* 时间 / 年龄 */
.time {
  color: #8a6f4d;
}

/* 喜欢 / 情感 */
.like {
  color: #8f5f5f;
}

.not-like {
  color: #9b4f4f;
}

/* 问候 / 感谢 / 告别 / 尊称 */
.greeting,
.thanks,
.bye,
.respect {
  color: #8f6f4f;
}

.from {
  color: #8f6f4f;
}
/* ===================== Reading ===================== */
.reading-card {
  min-height: 72vh;
  padding: clamp(22px, 4vw, 42px);
}

.reading-toolbar {
  justify-content: space-between;
  margin-bottom: 16px;
}

.reading-toolbar-left,
.reading-toolbar-right {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.reading-box {
  background: linear-gradient(180deg, #fff, rgba(255,255,255,.72));
  border-radius: 28px;
  border: 1px dashed rgba(90,68,52,.16);
  padding: clamp(22px, 4vw, 44px);
  min-height: 54vh;
}

.level-label {
  display: inline-block;
  padding: 8px 15px;
  border-radius: 999px;
  background: var(--active-soft, #e9f5ef);
  color: var(--active-dark, #356b58);
  font-weight: 900;
  margin-bottom: 24px;
  font-size: 19px;
}

.reading-box .token {
  cursor: pointer;
  position: relative;
  padding: 3px 5px;
  border-radius: 12px;
  transition: .18s ease;
}

.reading-box .token:hover {
  background: rgba(90,68,52,.08);
}

.tip {
  margin-top: 26px;
  padding: 16px 18px;
  border-radius: 18px;
  background: var(--active-soft, #e9f5ef);
  color: var(--active-dark, #356b58);
  font-size: 18px;
}

.meaning-pop {
  position: fixed;
  z-index: 2000;
  max-width: 260px;
  background: #fff;
  color: var(--active-dark, #356b58);
  border: 1px solid rgba(90,68,52,.12);
  box-shadow: 0 12px 28px rgba(58,101,82,.18);
  border-radius: 18px;
  padding: 12px 14px;
  font-size: 18px;
  font-weight: 800;
  display: none;
}

/* ===================== Practice ===================== */
.practice-question {
  padding: 18px;
  background: rgba(255,255,255,.72);
  border: 1px solid rgba(90,68,52,.08);
  border-radius: 20px;
}

.practice-question strong {
  font-size: 19px;
}

.inline-pinyin {
  color: #777;
  font-size: 16px;
  display: block;
  font-weight: 600;
  margin-top: 2px;
}

.choices {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.choice {
  display: inline-block;
  background: #fff;
  border: 1px solid rgba(90,68,52,.12);
  border-radius: 16px;
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 800;
  font-size: 17px;
  transition: .18s ease;
}

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

.choice.correct {
  background: #e7f6ed;
  border-color: #89c99f;
  color: #2f7a4e;
}

.choice.wrong {
  background: #ffecec;
  border-color: #e6a0a0;
  color: #a94343;
}

/* ===================== Challenge ===================== */
.challenge {
  background: linear-gradient(135deg, rgba(255,255,255,.82), #fff);
  border-left: 6px solid var(--active-color, #6BA892);
  padding: 20px 22px;
}

.challenge .section-title {
  font-size: 22px;
  margin-bottom: 8px;
  color: var(--active-dark, #356b58);
}

.challenge .line {
  margin: 10px 0;
  gap: 7px;
}

.challenge .token {
  min-width: 38px;
}

.challenge .token-pinyin {
  font-size: 15px;
  margin-bottom: 2px;
}

.challenge .token-hanzi,
.challenge .punct {
  font-size: 28px;
  line-height: 1.05;
}

.challenge .tip {
  margin-top: 12px;
  padding: 10px 12px;
  font-size: 14px;
}

.fill {
  display: inline-block;
  min-width: 150px;
  border-bottom: 4px solid var(--active-color, #6BA892);
  height: 1.2em;
  vertical-align: middle;
}

/* ===================== Footer ===================== */
.footer-note {
  text-align: center;
  color: var(--muted);
  margin-top: 30px;
  font-size: 14px;
}

.signature {
  display: flex;
  justify-content: flex-end;
  margin-top: 30px;
}

.signature-inner {
  background: rgba(255,245,238,.75);
  padding: 6px 12px;
  border-radius: 12px;
}

.signature-inner span {
  font-family: 'STLiti','KaiTi','Kaiti SC',serif;
  font-size: 18px;
  color: #9b6a58;
  letter-spacing: 1px;
}

/* ===================== Toggle States ===================== */
body.hide-pinyin .small-pinyin,
body.hide-pinyin .token-pinyin,
body.hide-pinyin .inline-pinyin {
  display: none;
}

body.hide-translation .translation {
  display: none;
}

/* ===================== Responsive ===================== */
@media (max-width: 620px) {
  .page {
    padding: 24px 12px 40px;
  }

  .hero,
  .lesson-hero {
    padding: 28px 18px;
    border-radius: 26px;
  }

  .hero::after {
    font-size: 36px;
    right: 14px;
    bottom: 10px;
  }

  .book-section,
  .card {
    padding: 18px;
  }

  .section-title {
    font-size: 22px;
  }

  .lesson-card {
    min-height: 170px;
  }

  .token-hanzi,
  .punct {
    font-size: clamp(28px, 8vw, 42px);
  }

  .token-pinyin {
    font-size: clamp(16px, 4vw, 22px);
  }

  .reading-box {
    padding: 20px;
  }
}
/* =========================================================
   Reading Sentence System
========================================================= */

.reading-sentence-row {

  position: relative;

  margin: 18px 0;

  padding-right: 74px;
}


.reading-sentence-row .sentence-content .line {
  margin:0;
  display:flex;
  flex-wrap:wrap;
  gap:10px 12px;
  align-items:flex-end;
}

/* =========================
   Right Side Buttons
========================= */

.sentence-tools {

  position: absolute;

  right: -70px;
  top: 50%;

  transform: translateY(-50%);

  display: flex;

  align-items: center;

  gap: 4px;
}

.sentence-audio-btn,
.sentence-translate-btn {

  width: 28px;
  height: 28px;

  min-width: 28px;

  border: none;

  border-radius: 50%;

  background: var(--active-soft, #f3f4f6);

  color: var(--active-dark, #333);

  font-size: 12px;

  cursor: pointer;

  display: inline-flex;

  align-items: center;

  justify-content: center;

  box-shadow: 0 2px 6px rgba(90, 68, 52, 0.12);

  transition: all 0.15s ease;
}

.sentence-audio-btn:hover,
.sentence-translate-btn:hover {

  background: #ffffff;

  transform: translateY(-1px);
}

/* =========================
   Sentence Translation
========================= */

.sentence-translation {

  display: none;

  margin-top: 10px;

  margin-left: 4px;

  padding: 10px 14px;

  border-radius: 14px;

  background: rgba(255,255,255,.75);

  color: #5d534d;

  font-size: 15px;

  line-height: 1.7;

  border: 1px solid rgba(90,68,52,.06);
}

.sentence-translation.show {

  display: block;
}

/* =========================
   Token Stability
========================= */

.token {

  display: inline-flex;

  flex-direction: column;

  align-items: center;

  justify-content: flex-end;

  white-space: nowrap;

  vertical-align: bottom;
}

/* 标点跟随前词 */

.punct-inline {

  display: inline-block;

  white-space: nowrap;

  font-size: 1.8em;

  font-weight: 800;

  margin-left: -2px;

  margin-right: 4px;

  vertical-align: bottom;

  line-height: 1;
}

/* =========================
   Hide Old Reading Button
========================= */

button[onclick="speakReading()"] {

  display: none !important;
}

/* =========================
   Mobile
========================= */

@media (max-width: 640px) {

  .reading-sentence-row {

    padding-right: 64px;
  }

  .sentence-tools {

    gap: 3px;
  }

  .sentence-audio-btn,
  .sentence-translate-btn {

    width: 25px;
    height: 25px;

    min-width: 25px;

    font-size: 10px;
  }

  .sentence-translation {

    font-size: 14px;

    line-height: 1.6;
  }
}
/* Dialogue hanging indent: one speaker, multiple sentences aligned */
.reading-sentence-row.dialogue-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 14px;
  align-items: start;
  padding-right: 74px;
  position: relative;
}

.dialogue-speaker-fixed {
  grid-column: 1;
  padding-top: 0;
}

.dialogue-content-fixed {
  grid-column: 2;
  min-width: 0;
}

.dialogue-sentence-block {
  position: relative;
  margin-bottom: 10px;
}

.dialogue-sentence-block .line {
  margin: 0;
}
.copy-link-btn {
  position: absolute;
  top: 12px;
  right: 12px;

  width: auto;
  height: 30px;
  min-width: 92px;

  padding: 0 10px;

  border-radius: 999px;

  font-size: 12px;
  font-weight: 800;

  opacity: 0.72;
  background: rgba(255,255,255,.86);
  color: #5f514a;

  box-shadow: 0 4px 10px rgba(90,68,52,.10);
  z-index: 5;

  white-space: nowrap;
}

.copy-link-btn:hover {
  opacity: 1;
  transform: translateY(-1px);
}
.hero h1 {
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.hero h1 br + * {
  font-weight: 700;
}
.hero-title {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin: 0;
  line-height: 1.05;
}

.hero-title-cn {
  font-size: clamp(46px, 5vw, 72px);
  font-weight: 900;
  letter-spacing: 6px;
  color: #4b3b35;
}

.hero-title-en {
  font-size: clamp(28px, 3.2vw, 46px);
  font-weight: 700;
  letter-spacing: 1px;
  color: #5f514a;
}

.hero-subtitle-cn {
  margin-top: 12px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 4px;
  color: #7b6a62;
}
.hero-title-simple {
  margin: 0;
  font-size: clamp(42px, 5vw, 72px);
  line-height: 1.15;
  font-weight: 900;
  letter-spacing: 2px;
  color: #4b3b35;
}
.hero-title-final {
  margin: 6px 0 0;
  font-size: clamp(54px, 6vw, 88px);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: 8px;
  color: #4b3b35;
}

.hero-subtitle-final {
  margin-top: 14px;
  font-size: clamp(18px, 2vw, 26px);
  font-weight: 800;
  letter-spacing: 8px;
  color: #7b6a62;
}
.lesson-title {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.35;
}

.lesson-pinyin {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.35;
}
/* Lesson page hero refinement */
#lessonHero.lesson-hero {
  box-shadow: 0 10px 24px rgba(90,68,52,.08);
  border-radius: 28px;
  padding: 26px 24px;
  min-height: auto;
}

#lessonHero .line {
  background: rgba(255,255,255,.72) !important;
  box-shadow: 0 8px 18px rgba(90,68,52,.06) !important;
  border: 1px solid rgba(255,255,255,.7);
}

#lessonHero .token-hanzi {
  font-size: clamp(36px, 4vw, 58px);
}

#lessonHero .token-pinyin {
  font-size: clamp(18px, 2vw, 28px);
  opacity: .82;
}
.sentence-row {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(260px, .85fr);
  gap: 28px;
  align-items: center;
}

.sentence-left .line {
  margin: 0;
}

.sentence-right {
  margin-top: 0;
  font-size: 15px;
  line-height: 1.6;
  color: #6f625c;
  background: rgba(255,255,255,.55);
  border-radius: 14px;
  padding: 10px 14px;
}

@media (max-width: 760px) {
  .sentence-row {
    grid-template-columns: 1fr;
    gap: 10px;
  }
}
@media (max-width: 760px) {
  .key-grid {
    grid-template-columns: repeat(2, minmax(120px, 1fr)) !important;
  }
}
/* =========================================================
   Home Single-Book Switch Layout
========================================================= */

#bookFilters {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin: 24px 0 28px;
}

.book-filter-btn {
  min-width: 74px;
  height: 52px;
  padding: 0 20px;
  border-radius: 22px;
  font-size: 22px;
  font-weight: 900;
  background: var(--book-soft);
  color: var(--book-dark);
  border: 2px solid transparent;
  box-shadow: 0 8px 18px rgba(90,68,52,.10);
}

.book-filter-btn.active {
  min-width: 104px;
  height: 66px;
  font-size: 30px;
  background: var(--book-color) !important;
  color: #fff !important;
  border-color: rgba(255,255,255,.9);
  transform: translateY(-3px);
}

.book-section {
  margin-top: 16px;
}

.book-section .section-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
}

.lesson-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

@media (max-width: 760px) {
  #bookFilters {
    gap: 8px;
    margin: 18px 0 20px;
  }

  .book-filter-btn {
    min-width: 48px;
    height: 38px;
    padding: 0 10px;
    font-size: 16px;
    border-radius: 16px;
  }

  .book-filter-btn.active {
    min-width: 64px;
    height: 46px;
    font-size: 21px;
  }

  .book-section .section-title {
    flex-wrap: nowrap;
    white-space: nowrap;
    overflow-x: auto;
  }

  .book-section .section-title h2 {
    font-size: 22px !important;
    white-space: nowrap;
  }

  .book-section .section-title span {
    font-size: 11px !important;
    white-space: nowrap;
    opacity: .7;
  }

  .lesson-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
    gap: 8px !important;
  }

  .lesson-card {
    min-height: 120px !important;
    padding: 10px 8px !important;
    border-radius: 16px !important;
  }

  .lesson-number {
    font-size: 10px !important;
    padding: 3px 7px !important;
    margin-bottom: 6px !important;
  }

  .lesson-title {
    font-size: 16px !important;
    line-height: 1.25 !important;
  }

  .lesson-pinyin {
    font-size: 11px !important;
    line-height: 1.25 !important;
  }

  .copy-link-btn {
  height: 24px !important;
  min-width: 70px !important;
  width: auto !important;
  padding: 0 7px !important;
  font-size: 10px !important;
  top: 8px !important;
  right: 8px !important;
}
}
/* =========================================================
   Home Dashboard Tight Upgrade
   Bigger book buttons + smaller lesson cards
========================================================= */

/* 顶部 1A/1B/1C 按钮更大、更明显 */
.book-filter-btn {
  min-width: 92px !important;
  height: 58px !important;
  font-size: 28px !important;
  border-radius: 24px !important;
  background: color-mix(in srgb, var(--book-color) 28%, white) !important;
  color: var(--book-dark) !important;
}

.book-filter-btn.active {
  min-width: 118px !important;
  height: 68px !important;
  font-size: 36px !important;
  background: var(--book-color) !important;
  color: #fff !important;
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 12px 26px rgba(90,68,52,.18) !important;
}

/* 首页书本区整体更紧凑 */
.book-section {
  margin-top: 12px !important;
  padding: 18px 22px !important;
  border-radius: 26px !important;
}

/* 顶部标题区压缩 */
.book-section .section-title {
  padding-bottom: 10px !important;
  margin-bottom: 14px !important;
}

.book-section .section-title h2 {
  font-size: 36px !important;
}

.book-section .section-title span {
  font-size: 13px !important;
}

/* 9课卡片更小，保持三列 */
.lesson-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
  gap: 12px !important;
}

.lesson-card {
  min-height: 130px !important;
  padding: 14px 16px !important;
  border-radius: 20px !important;
}

.lesson-number {
  font-size: 12px !important;
  padding: 4px 9px !important;
  margin-bottom: 8px !important;
}

.lesson-title {
  font-size: 21px !important;
  line-height: 1.25 !important;
  margin-bottom: 6px !important;
  -webkit-line-clamp: 1 !important;
}

.lesson-pinyin {
  font-size: 13px !important;
  line-height: 1.25 !important;
  -webkit-line-clamp: 1 !important;
}

.lesson-card > div[style*="font-size:60px"] {
  font-size: 42px !important;
  right: 14px !important;
  bottom: 8px !important;
}

/* 手机端也更紧凑 */
@media (max-width: 760px) {
  .book-filter-btn {
    min-width: 58px !important;
    height: 42px !important;
    font-size: 18px !important;
  }

  .book-filter-btn.active {
    min-width: 72px !important;
    height: 50px !important;
    font-size: 24px !important;
  }

  .book-section .section-title h2 {
    font-size: 22px !important;
  }

  .book-section .section-title span {
    font-size: 11px !important;
  }

  .lesson-card {
    min-height: 110px !important;
    padding: 10px 8px !important;
  }

  .lesson-title {
    font-size: 15px !important;
  }

  .lesson-pinyin {
    font-size: 10px !important;
  }
}
/* =========================================================
   Lesson Module Tabs
   Words / Reading / Practice / Challenge
========================================================= */

.lesson-module-tabs {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 18px 0 20px;
  padding: 12px 0;
  background: rgba(251,247,241,.9);
  backdrop-filter: blur(8px);
}

.lesson-module-btn {
  min-height: 58px;
  border-radius: 24px;
  font-size: 20px;
  font-weight: 900;
  background: #fff;
  color: var(--active-dark);
  border: 2px solid var(--active-soft);
}

.lesson-module-btn.active {
  background: var(--active-color) !important;
  color: #fff !important;
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 26px rgba(90,68,52,.18);
}

.lesson-module {
  animation: lessonModuleFade .18s ease;
}

@keyframes lessonModuleFade {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 760px) {
  .lesson-module-tabs {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin: 14px 0 16px;
  }

  .lesson-module-btn {
    min-height: 46px;
    font-size: 16px;
    border-radius: 18px;
    padding: 8px 6px;
  }
}
/* =========================================================
   Quiz Mode
   Practice as one-question-at-a-time quiz
========================================================= */

.practice-grid {
  display: block !important;
}

.quiz-card {
  max-width: 860px;
  margin: 0 auto;
  padding: 26px;
  border-radius: 26px;
  background: linear-gradient(180deg, #fff, rgba(255,255,255,.78));
  border: 1px solid rgba(90,68,52,.08);
  box-shadow: 0 10px 24px rgba(90,68,52,.08);
}

.quiz-progress {
  display: inline-block;
  margin-bottom: 18px;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--active-soft);
  color: var(--active-dark);
  font-weight: 900;
  font-size: 16px;
}

.quiz-question {
  font-size: 22px;
  line-height: 1.55;
  color: #493730;
  margin-bottom: 20px;
}

.quiz-prompt {
  margin-top: 16px;
  padding: 16px;
  border-radius: 18px;
  background: rgba(255,255,255,.72);
  border: 1px dashed rgba(90,68,52,.14);
  font-size: 26px;
  text-align: center;
}

.quiz-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 18px;
}

.quiz-choice {
  width: 100%;
  min-height: 72px;
  border-radius: 20px;
  padding: 14px 16px;
  font-size: 20px;
  line-height: 1.35;
  text-align: center;
  background: #fff;
  border: 2px solid rgba(90,68,52,.10);
  color: #4b3b35;
}

.quiz-choice.correct {
  background: #e7f6ed !important;
  border-color: #7ac895 !important;
  color: #2f7a4e !important;
}

.quiz-choice.wrong {
  background: #ffecec !important;
  border-color: #e6a0a0 !important;
  color: #a94343 !important;
}

.quiz-nav {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: 24px;
}

.quiz-nav button {
  min-width: 150px;
  min-height: 48px;
  font-size: 17px;
}

.quiz-nav button:disabled {
  opacity: .35;
  cursor: not-allowed;
  transform: none;
}

@media (max-width: 760px) {
  .lesson-module-tabs {
    grid-template-columns: repeat(3, 1fr);
  }

  .quiz-card {
    padding: 18px 14px;
  }

  .quiz-question {
    font-size: 18px;
  }

  .quiz-choices {
    grid-template-columns: 1fr;
  }

  .quiz-choice {
    min-height: 58px;
    font-size: 17px;
  }

  .quiz-nav button {
    min-width: 0;
    width: 100%;
    font-size: 15px;
  }
}
/* =========================================================
   Quiz V2.2 Visual Upgrade
========================================================= */

.quiz-card {
  max-width: 900px;
  margin: 0 auto;
  padding: 34px;
  border-radius: 32px;
  background: linear-gradient(180deg, #ffffff, rgba(255,255,255,.82));
  border: 1px solid rgba(90,68,52,.08);
  box-shadow: 0 16px 34px rgba(90,68,52,.10);
}

.quiz-top {
  margin-bottom: 22px;
}

.quiz-progress {
  display: inline-block;
  margin-bottom: 12px;
  padding: 7px 16px;
  border-radius: 999px;
  background: var(--active-soft);
  color: var(--active-dark);
  font-weight: 900;
  font-size: 16px;
}

.quiz-progress-bar {
  width: 100%;
  height: 12px;
  border-radius: 999px;
  background: rgba(90,68,52,.08);
  overflow: hidden;
}

.quiz-progress-bar div {
  height: 100%;
  border-radius: 999px;
  background: var(--active-color);
  transition: width .25s ease;
}

.quiz-instruction {
  font-size: 28px;
  font-weight: 900;
  color: var(--active-dark);
  margin: 22px 0;
  line-height: 1.35;
}

.quiz-chinese-card,
.quiz-english-card,
.quiz-question-text {
  margin: 20px 0 26px;
  padding: 24px 28px;
  border-radius: 28px;
  background: var(--active-soft);
  color: var(--active-dark);
  text-align: center;
  border: 1px solid rgba(90,68,52,.08);
}

.quiz-chinese-card .line {
  justify-content: center;
  margin: 0;
}

.quiz-pinyin {
  font-size: 24px;
  font-weight: 800;
  color: #657a70;
  margin-bottom: 4px;
}

.quiz-hanzi {
  font-size: 54px;
  font-weight: 900;
  line-height: 1.15;
}

.quiz-english-card {
  font-size: 36px;
  font-weight: 900;
  line-height: 1.3;
}

.quiz-question-text {
  font-size: 26px;
  font-weight: 800;
  line-height: 1.45;
}

.quiz-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.quiz-choice {
  width: 100%;
  min-height: 76px;
  border-radius: 24px;
  padding: 16px 20px;
  font-size: 22px;
  line-height: 1.35;
  text-align: center;
  background: #fff;
  color: #4b3b35;
  border: 2px solid rgba(90,68,52,.10);
  box-shadow: 0 8px 18px rgba(90,68,52,.08);
}

.quiz-choice:hover {
  transform: translateY(-2px);
}

.quiz-choice.correct {
  background: #e7f6ed !important;
  border-color: #74c993 !important;
  color: #2f7a4e !important;
}

.quiz-choice.wrong {
  background: #ffecec !important;
  border-color: #e6a0a0 !important;
  color: #a94343 !important;
}

.quiz-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 28px;
}

.quiz-nav button {
  min-width: 150px;
  min-height: 50px;
  font-size: 17px;
}

.quiz-nav button:disabled {
  opacity: .35;
  cursor: not-allowed;
  transform: none;
}

@media (max-width: 760px) {
  .quiz-card {
    padding: 20px 14px;
    border-radius: 24px;
  }

  .quiz-instruction {
    font-size: 22px;
  }

  .quiz-chinese-card,
  .quiz-english-card,
  .quiz-question-text {
    padding: 18px 14px;
    border-radius: 22px;
  }

  .quiz-pinyin {
    font-size: 20px;
  }

  .quiz-hanzi {
    font-size: 42px;
  }

  .quiz-english-card {
    font-size: 26px;
  }

  .quiz-choices {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .quiz-choice {
    min-height: 58px;
    font-size: 18px;
    border-radius: 18px;
  }

  .quiz-nav button {
    width: 100%;
    min-width: 0;
  }
}
/* =========================================================
   Quiz V2.3 Score + First Answer Only
========================================================= */

.quiz-choice:disabled {
  cursor: default;
  transform: none;
}

.quiz-feedback {
  margin-top: 18px;
  padding: 14px 18px;
  border-radius: 18px;
  font-size: 20px;
  font-weight: 900;
  text-align: center;
}

.quiz-feedback.correct {
  background: #e7f6ed;
  color: #2f7a4e;
}

.quiz-feedback.wrong {
  background: #fff0e8;
  color: #9b5a37;
}

.quiz-result-card {
  text-align: center;
}

.quiz-result-title {
  font-size: 34px;
  font-weight: 900;
  color: var(--active-dark);
  margin-bottom: 18px;
}

.quiz-score {
  font-size: 76px;
  font-weight: 900;
  color: var(--active-dark);
  line-height: 1;
}

.quiz-score-percent {
  margin-top: 10px;
  font-size: 30px;
  font-weight: 900;
  color: var(--active-color);
}

.quiz-result-message {
  margin: 24px auto;
  max-width: 620px;
  font-size: 22px;
  line-height: 1.5;
  color: #5f514a;
}

.quiz-result-actions {
  justify-content: center;
}

@media (max-width: 760px) {
  .quiz-result-title {
    font-size: 26px;
  }

  .quiz-score {
    font-size: 56px;
  }

  .quiz-score-percent {
    font-size: 24px;
  }

  .quiz-result-message {
    font-size: 18px;
  }
}
/* Lesson page compact header + global display tools */

#lessonHero.lesson-hero {
  padding: 16px 22px !important;
  border-radius: 26px !important;
}

#lessonHero .line {
  padding: 10px 18px !important;
  border-radius: 20px !important;
}

#lessonHero .token-hanzi {
  font-size: clamp(30px, 3vw, 44px) !important;
}

#lessonHero .token-pinyin {
  font-size: clamp(15px, 1.5vw, 22px) !important;
}

#lessonHero div[style*="margin-top:26px"] {
  margin-top: 14px !important;
  font-size: 12px !important;
}

#lessonHero div[style*="margin-top:12px"] {
  margin-top: 8px !important;
  font-size: 15px !important;
}

.lesson-module-tabs {
  max-width: 1180px;
  margin: 18px auto 12px !important;
}

.lesson-display-tools {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin: 0 auto 18px;
  padding: 0 10px;
}

.lesson-display-tools button {
  min-width: 220px;
  height: 46px;
  font-size: 16px;
}

#lessonToolbar {
  justify-content: center !important;
}

#lessonToolbar button {
  min-width: 150px;
}

@media (max-width: 760px) {
  .lesson-display-tools {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .lesson-display-tools button {
    min-width: 0;
    width: 100%;
    font-size: 14px;
  }
}
/* =========================================================
   Reading Layout Clean Upgrade
========================================================= */

.reading-card {
  position: relative;
}

.reading-card > .section-title {
  justify-content: center;
  font-size: 30px !important;
  margin-bottom: 12px !important;
}

/* 拼音/翻译变成右侧小工具 */
.reading-header-tools {
  position: absolute;
  top: 22px;
  right: 26px;
  display: flex;
  gap: 8px;
}

.reading-header-tools button {
  min-width: auto !important;
  height: 34px !important;
  padding: 0 12px !important;
  font-size: 13px !important;
  border-radius: 999px !important;
  background: rgba(255,255,255,.78) !important;
  color: var(--active-dark) !important;
  box-shadow: 0 4px 12px rgba(90,68,52,.08) !important;
}

/* Level A/B/C 上移到 Reading 标题下面，并居中 */
#lessonToolbar {
  position: static !important;
  display: flex !important;
  justify-content: center !important;
  gap: 14px !important;
  margin: 8px auto 24px !important;
  padding: 10px 0 !important;
  background: transparent !important;
  backdrop-filter: none !important;
}

/* Level 按钮变成小色块，和上面大模块区分 */
#lessonToolbar button {
  min-width: 140px !important;
  height: 42px !important;
  padding: 0 18px !important;
  font-size: 15px !important;
  border-radius: 16px !important;
  box-shadow: none !important;
  border: 2px solid rgba(90,68,52,.08) !important;
  background: var(--active-soft) !important;
  color: var(--active-dark) !important;
}

/* 三个 Level 用不同透明度区分 */
#lessonToolbar button:nth-child(1) {
  background: rgba(107,168,146,.16) !important;
  color: #356b58 !important;
}

#lessonToolbar button:nth-child(2) {
  background: rgba(216,170,83,.18) !important;
  color: #8a651e !important;
}

#lessonToolbar button:nth-child(3) {
  background: rgba(111,143,199,.18) !important;
  color: #3f5f9a !important;
}

#lessonToolbar button.active {
  color: #fff !important;
  transform: none !important;
}

#lessonToolbar button:nth-child(1).active {
  background: #6BA892 !important;
}

#lessonToolbar button:nth-child(2).active {
  background: #D8AA53 !important;
}

#lessonToolbar button:nth-child(3).active {
  background: #6F8FC7 !important;
}

/* 模块按钮保持大，但和工具按钮区别明显 */
.lesson-module-tabs {
  max-width: 980px !important;
  margin: 18px auto 18px !important;
  gap: 18px !important;
}

.lesson-module-btn {
  min-height: 56px !important;
  font-size: 20px !important;
  border-radius: 22px !important;
}

/* 手机端 */
@media (max-width: 760px) {
  .reading-card > .section-title {
    justify-content: flex-start;
    font-size: 24px !important;
  }

  .reading-header-tools {
    position: static;
    justify-content: center;
    margin-bottom: 12px;
  }

  .reading-header-tools button {
    flex: 1;
    height: 38px !important;
    font-size: 13px !important;
  }

  #lessonToolbar {
    display: grid !important;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px !important;
  }

  #lessonToolbar button {
    min-width: 0 !important;
    width: 100% !important;
    font-size: 13px !important;
    padding: 0 6px !important;
  }
}
/* Lesson top module row + small global tools */

.lesson-module-tabs {
  display: grid !important;
  grid-template-columns: 1fr 1fr 1fr auto !important;
  align-items: center !important;
  max-width: 1180px !important;
  margin: 18px auto 22px !important;
  gap: 14px !important;
}

.lesson-global-tools {
  display: flex;
  gap: 8px;
  align-items: center;
  justify-content: flex-end;
}

.lesson-global-tools button {
  min-width: auto !important;
  height: 34px !important;
  padding: 0 12px !important;
  font-size: 13px !important;
  border-radius: 999px !important;
  background: rgba(255,255,255,.65) !important;
  color: var(--active-dark) !important;
  border: 1px solid rgba(90,68,52,.08) !important;
  box-shadow: 0 4px 10px rgba(90,68,52,.06) !important;
  opacity: .75;
}

.lesson-global-tools button:hover {
  opacity: 1;
  transform: translateY(-1px);
}

/* Reading内部不再需要右侧工具 */
.reading-header-tools,
.lesson-display-tools {
  display: none !important;
}

@media (max-width: 760px) {
  .lesson-module-tabs {
    grid-template-columns: repeat(3, 1fr) !important;
  }

  .lesson-global-tools {
    grid-column: 1 / -1;
    justify-content: center;
    margin-top: 4px;
  }

  .lesson-global-tools button {
    height: 32px !important;
    font-size: 12px !important;
  }
}
/* Home brand refinement */

.brand-tag {
  font-size: 22px !important;
  padding: 10px 22px !important;
  letter-spacing: 1.5px !important;
}

.hero-title-final {
  font-size: clamp(44px, 5vw, 70px) !important;
  letter-spacing: 6px !important;
}

.hero-subtitle-final {
  font-size: clamp(17px, 1.7vw, 23px) !important;
  letter-spacing: 7px !important;
}

.library-about {
  max-width: 1180px;
  margin: 24px auto 0;
  padding: 14px 22px;
  border-radius: 18px;
  background: rgba(255,255,255,.55);
  color: rgba(90,68,52,.62);
  font-size: 13px;
  line-height: 1.8;
  text-align: center;
  box-shadow: 0 8px 18px rgba(90,68,52,.05);
}

@media (max-width: 760px) {
  .brand-tag {
    font-size: 15px !important;
    padding: 7px 14px !important;
  }

  .hero-title-final {
    font-size: 44px !important;
  }

  .library-about {
    font-size: 11px;
    text-align: left;
  }
}
.back-haoteach{
    position:absolute;
    top:22px;
    left:22px;

    display:flex;
    align-items:center;

    padding:10px 18px;

    border-radius:999px;

    background:rgba(255,255,255,.92);

    color:#5b4a42;

    font-size:15px;
    font-weight:700;

    text-decoration:none;

    box-shadow:0 8px 18px rgba(0,0,0,.08);

    transition:.25s;
    z-index:10;
}

.back-haoteach:hover{
    transform:translateY(-2px);
    box-shadow:0 12px 24px rgba(0,0,0,.12);
}