:root {
  --paper: #edf5e8;
  --paper-deep: #cfe0c1;
  --ink: #203024;
  --muted: #657362;
  --line: #c8d8bf;
  --red: #984a38;
  --blue: #2e5963;
  --green: #416a4b;
  --white: #fbfdf4;
  --shadow: 0 18px 45px rgba(31, 55, 36, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(65, 106, 75, 0.07) 1px, transparent 1px),
    linear-gradient(0deg, rgba(46, 89, 99, 0.05) 1px, transparent 1px),
    var(--paper);
  background-size: 34px 34px;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Serif SC", serif;
}

button,
input {
  font: inherit;
}

.sidebar-toggle {
  display: none;
}

.app-shell {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  padding: 24px 18px;
  border-right: 1px solid var(--line);
  background: rgba(251, 253, 244, 0.9);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 22px;
}

.brand-mark {
  display: grid;
  width: 54px;
  height: 54px;
  place-items: center;
  color: var(--white);
  background: var(--ink);
  border: 3px double var(--paper-deep);
  font-size: 20px;
  font-weight: 800;
}

.brand h1,
.reader-head h2,
.practice-head h3 {
  margin: 0;
}

.brand h1 {
  font-size: 22px;
  letter-spacing: 0;
}

.brand p,
.meta,
.eyebrow {
  margin: 4px 0 0;
  color: var(--muted);
}

.search-box {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 13px;
}

.search-box input {
  width: 100%;
  height: 42px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: var(--white);
  outline: none;
}

.search-box input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(46, 89, 99, 0.13);
}

.category-list {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.category-btn,
.work-btn,
.reader-actions button,
.tab-btn {
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: var(--white);
  cursor: pointer;
}

.category-btn {
  min-height: 40px;
  padding: 8px 10px;
  text-align: left;
}

.category-btn.active {
  color: var(--white);
  border-color: var(--ink);
  background: var(--ink);
}

.work-list {
  display: grid;
  gap: 10px;
}

.work-btn {
  display: grid;
  gap: 4px;
  width: 100%;
  min-height: 70px;
  padding: 12px;
  text-align: left;
}

.work-btn.active {
  border-color: var(--red);
  box-shadow: inset 4px 0 0 var(--red);
}

.work-btn strong {
  font-size: 16px;
}

.work-btn span {
  color: var(--muted);
  font-size: 13px;
}

.work-btn .work-progress {
  color: var(--green);
  font-weight: 700;
}

.main-panel {
  min-width: 0;
  padding: 28px;
}

.reader-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.eyebrow {
  font-size: 13px;
  font-weight: 700;
  color: var(--red);
}

.reader-head h2 {
  margin-top: 6px;
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing: 0;
}

.reader-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.reader-actions button {
  height: 38px;
  padding: 0 14px;
}

.tab-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 12px;
}

.tab-btn {
  flex: 0 0 auto;
  height: 38px;
  padding: 0 14px;
}

.tab-btn.active {
  color: var(--white);
  border-color: var(--blue);
  background: var(--blue);
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 18px;
  align-items: start;
}

.reading-card,
.practice-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(251, 253, 244, 0.95);
  box-shadow: var(--shadow);
}

.reading-card {
  min-height: 620px;
  padding: 26px;
}

.practice-card {
  position: sticky;
  top: 28px;
  max-height: calc(100vh - 56px);
  overflow: auto;
  padding: 18px;
}

.section-title {
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 20px;
  font-weight: 800;
}

.markdown-body {
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  font-size: 18px;
  line-height: 2;
}

.markdown-body p {
  margin: 0 0 14px;
}

.markdown-body ol {
  padding-left: 24px;
}

.markdown-body li {
  margin-bottom: 8px;
}

.original-body {
  font-size: 21px;
  line-height: 2.35;
}

.original-paragraph {
  text-indent: 2em;
}

.translation-pair-body {
  display: grid;
  gap: 18px;
  font-size: 18px;
  line-height: 1.95;
}

.translation-group h3 {
  margin: 0 0 4px;
  color: var(--ink);
  font-size: 21px;
}

.translation-author {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 15px;
}

.translation-group + .translation-group {
  margin-top: 8px;
}

.translation-pair {
  padding: 0 0 18px;
  border-bottom: 1px dashed var(--line);
}

.translation-pair:last-child {
  border-bottom: 0;
}

.translation-original {
  margin: 0 0 6px;
  color: var(--ink);
  font-size: 20px;
  line-height: 2.1;
  text-indent: 2em;
}

.translation-text {
  margin: 0;
  color: var(--blue);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 16px;
  line-height: 1.85;
  text-indent: 2em;
}

.annotated-term {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  min-width: max-content;
  margin: 0 2px;
  padding: 0 3px 2px;
  border-radius: 5px;
  vertical-align: middle;
  line-height: 1.25;
  outline: none;
}

.term-text {
  position: relative;
  padding-bottom: 3px;
}

.term-text::after {
  position: absolute;
  left: 24%;
  right: 24%;
  bottom: 0;
  height: 1px;
  background: rgba(65, 106, 75, 0.36);
  content: "";
}

.inline-note {
  margin-top: 3px;
  color: var(--green);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 12px;
  line-height: 1.25;
  white-space: nowrap;
}

.annotated-term:hover,
.annotated-term:focus {
  background: rgba(207, 224, 193, 0.55);
}

.practice-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

#questionCount {
  color: var(--green);
  font-size: 13px;
  font-weight: 700;
}

.quiz-list {
  display: grid;
  gap: 12px;
}

.question-item {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fffff8;
}

.question-item h4 {
  margin: 0 0 10px;
  font-size: 15px;
}

.question-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.answer {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  color: var(--blue);
}

.answers-hidden .answer {
  display: none;
}

.content-grid.recite-layout {
  grid-template-columns: 1fr;
}

.content-grid.recite-layout .practice-card {
  display: none;
}

.recite-panel {
  display: grid;
  gap: 20px;
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
}

.recite-toolbar,
.recite-difficulties,
.recite-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.recite-toolbar {
  justify-content: space-between;
}

.recite-toolbar button {
  min-height: 40px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: var(--white);
  cursor: pointer;
}

.recite-toolbar button.active {
  color: var(--white);
  border-color: var(--blue);
  background: var(--blue);
}

.recite-toolbar button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.recite-group {
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--line);
}

.recite-group:last-of-type {
  border-bottom: 0;
}

.recite-group h3 {
  margin: 0 0 4px;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  font-size: 22px;
}

.recite-author {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 15px;
}

.recite-subtitle {
  margin: 14px 0 6px;
  color: var(--blue);
  font-size: 16px;
}

.recite-line {
  margin-bottom: 8px;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  font-size: 20px;
  line-height: 2.4;
}

.recite-unit {
  display: inline;
}

.recite-blank {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  margin: 0 4px;
  vertical-align: middle;
}

.recite-blank input {
  min-width: 3em;
  max-width: 100%;
  min-height: 40px;
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--ink);
  background: #fffff8;
  font-size: 18px;
  outline: none;
}

.recite-blank input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(46, 89, 99, 0.13);
}

.recite-blank input.correct {
  border-color: var(--green);
  background: rgba(65, 106, 75, 0.1);
}

.recite-blank input.wrong {
  border-color: var(--red);
  background: rgba(152, 74, 56, 0.1);
}

.recite-correction {
  max-width: 24em;
  color: var(--red);
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  font-size: 13px;
  line-height: 1.5;
}

.recite-wrong-list {
  display: grid;
  gap: 14px;
}

.recite-wrong-list .recite-blank {
  margin: 0;
}

.recite-score,
.recite-cleared {
  margin: 0;
  color: var(--green);
  font-weight: 700;
}

.recite-cleared {
  padding: 28px;
  border: 1px dashed var(--green);
  border-radius: 7px;
  text-align: center;
}

@media (max-width: 1100px) {
  .app-shell {
    grid-template-columns: 280px minmax(0, 1fr);
  }

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

  .practice-card {
    position: static;
    max-height: none;
  }
}

@media (max-width: 760px) {
  .app-shell {
    display: block;
  }

  .sidebar-toggle {
    position: sticky;
    z-index: 2;
    top: 0;
    display: block;
    width: 100%;
    height: 44px;
    padding: 0 18px;
    border: 0;
    border-bottom: 1px solid var(--line);
    color: var(--ink);
    background: var(--white);
    text-align: left;
    cursor: pointer;
  }

  .sidebar {
    display: none;
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .app-shell.sidebar-open .sidebar {
    display: block;
  }

  .main-panel {
    padding: 18px;
    scroll-margin-top: 44px;
  }

  .reader-head {
    display: grid;
  }

  .reader-actions {
    justify-content: flex-start;
  }

  .reader-actions button,
  .category-btn {
    min-height: 44px;
  }

  .reading-card {
    min-height: auto;
    padding: 20px;
  }

  .annotated-term {
    min-width: 0;
    max-width: 100%;
  }

  .inline-note {
    white-space: normal;
  }

  .recite-toolbar,
  .recite-difficulties,
  .recite-actions {
    align-items: stretch;
  }

  .recite-toolbar button {
    min-height: 44px;
  }

  .recite-line {
    display: grid;
    gap: 8px;
    line-height: 1.8;
  }

  .recite-unit,
  .recite-blank {
    display: block;
    margin: 0;
  }

  .recite-blank input {
    min-height: 44px;
    font-size: 16px;
  }
}

@media print {
  .sidebar,
  .sidebar-toggle,
  .reader-actions,
  .tab-strip {
    display: none;
  }

  .app-shell,
  .content-grid {
    display: block;
  }

  .main-panel {
    padding: 0;
  }

  .reading-card,
  .practice-card {
    box-shadow: none;
    page-break-inside: avoid;
  }

  .content-grid.recite-layout {
    display: none;
  }
}