:root {
  --blue: #2f6fed;
  --blue-soft: #e8efff;
  --green: #12a17a;
  --green-soft: #e3f7f0;
  --amber: #f0a020;
  --ink: #1e2430;
  --ink-2: #55617a;
  --line: #e4e9f2;
  --bg: #f5f7fc;
  --card: #ffffff;
  --shadow: 0 2px 10px rgba(30, 45, 80, 0.07);
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    "PingFang SC",
    "Microsoft YaHei",
    "Hiragino Sans GB",
    system-ui,
    -apple-system,
    "Segoe UI",
    sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ---------------- 通用 ---------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.noscript-tip {
  margin: 0 0 16px;
  padding: 10px 14px;
  background: #fff7e6;
  border: 1px solid #ffe1a8;
  border-radius: 10px;
  color: #8a5a00;
  font-size: 13px;
  line-height: 1.7;
}

/* ---------------- 顶栏 ---------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.logo {
  width: 42px;
  height: 42px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: #fff;
  overflow: hidden;
}
.logo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.brand-text {
  min-width: 0;
}
.brand-text h1 {
  margin: 0;
  font-size: 18px;
  line-height: 1.3;
  letter-spacing: 0.5px;
}
.brand-text h1 a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.2s;
}
.brand-text h1 a:hover {
  color: var(--blue);
}
.brand-text p {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--ink-2);
}

.tabs {
  display: flex;
  gap: 6px;
  padding: 4px;
  background: var(--blue-soft);
  border-radius: 999px;
  flex-wrap: wrap;
}
.tab {
  border: 0;
  background: transparent;
  color: var(--ink-2);
  padding: 8px 20px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: 0.2s;
}
.tab.active {
  background: #fff;
  color: var(--blue);
  box-shadow: var(--shadow);
}

.topbar-tools {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 14px;
}
.speed {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-2);
}
.speed input {
  width: 96px;
  accent-color: var(--blue);
}
#rateVal {
  width: 34px;
  font-variant-numeric: tabular-nums;
}

.ghost-btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-2);
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 13px;
  cursor: pointer;
  transition: 0.2s;
}
.ghost-btn:hover {
  border-color: var(--blue);
  color: var(--blue);
}

/* ---------------- 布局 ---------------- */
main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 24px 40px;
}

.view {
  display: none;
}
.view.active {
  display: block;
  animation: fade 0.25s ease;
}
@keyframes fade {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.version-tip {
  margin: 0 0 14px;
  padding: 9px 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ink-2);
  background: #eef3ff;
  border-left: 3px solid var(--blue);
  border-radius: 8px;
}

.subbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.book-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.chip {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-2);
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13px;
  cursor: pointer;
  transition: 0.18s;
}
.chip:hover {
  border-color: var(--blue);
  color: var(--blue);
}
.chip.active {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
  box-shadow: 0 3px 10px rgba(47, 111, 237, 0.25);
}

.filters {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}
input[type="search"] {
  border: 1px solid var(--line);
  background: #fff;
  padding: 9px 14px;
  border-radius: 10px;
  font-size: 13px;
  width: 240px;
  outline: none;
  transition: 0.2s;
}
input[type="search"]:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.12);
}

.switch {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--ink-2);
  cursor: pointer;
}
.switch input {
  accent-color: var(--green);
  width: 16px;
  height: 16px;
}

/* ---------------- 单元卡片 ---------------- */
.unit-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px 18px;
  margin-bottom: 16px;
}
.unit-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.unit-no {
  font-size: 12px;
  font-weight: 700;
  color: var(--blue);
  background: var(--blue-soft);
  padding: 4px 10px;
  border-radius: 8px;
}
.unit-name {
  font-size: 15px;
  font-weight: 600;
}
.unit-book {
  font-size: 11px;
  color: var(--ink-2);
  background: #f2f5fb;
  padding: 3px 8px;
  border-radius: 6px;
}
.unit-head .play-unit {
  margin-left: auto;
}

.play-btn,
.play-unit {
  border: 0;
  background: var(--green-soft);
  color: var(--green);
  font-size: 12.5px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: 9px;
  cursor: pointer;
  transition: 0.18s;
}
.play-btn:hover,
.play-unit:hover {
  background: var(--green);
  color: #fff;
}
.play-btn.playing {
  background: var(--green);
  color: #fff;
}

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

.word {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fcfdff;
  cursor: pointer;
  transition: 0.18s;
}
.word:hover {
  border-color: var(--blue);
  background: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.word.speaking {
  border-color: var(--green);
  background: var(--green-soft);
}

.word-main {
  flex: 1;
  min-width: 0;
}
.word-en {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.2px;
  word-break: break-word;
}
.word-ph {
  font-size: 12px;
  color: var(--blue);
  min-height: 14px;
}
.word-cn {
  font-size: 13px;
  color: var(--ink-2);
}
.quiz-on .word-cn {
  filter: blur(6px);
  user-select: none;
}
.quiz-on .word.revealed .word-cn {
  filter: none;
}

.word .spk {
  flex: none;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 14px;
}
.word.speaking .spk {
  background: var(--green);
  color: #fff;
}

/* ---------------- 英语：句型 ---------------- */
.pattern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 14px;
}

.pattern-card {
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 15px 17px;
  border-top: 3px solid var(--green);
}

.pattern-head {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.pattern-head .play-btn {
  flex: none;
}
.pattern-main {
  flex: 1;
  min-width: 0;
}
.pattern-en {
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.5;
  word-break: break-word;
}
.pattern-cn {
  font-size: 13px;
  color: var(--ink-2);
  margin-top: 3px;
}
.pattern-use {
  display: inline-block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--green);
  background: var(--green-soft);
  padding: 2px 9px;
  border-radius: 6px;
}
.pattern-eg {
  margin-top: 10px;
  padding: 9px 11px;
  background: #f7f9fe;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.9;
  color: var(--ink);
}
.pattern-eg .eg-cn {
  color: var(--ink-2);
  font-size: 12.5px;
}

/* ---------------- 英语：语法 ---------------- */
.grammar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 14px;
}

.grammar-card {
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 15px 17px;
  border-top: 3px solid var(--amber);
}

.grammar-head {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-wrap: wrap;
}
.grammar-title {
  margin: 0;
  font-size: 15.5px;
}
.grammar-no {
  font-size: 11px;
  color: #b87400;
  background: #fff3e0;
  padding: 2px 8px;
  border-radius: 6px;
}
.grammar-body {
  margin-top: 8px;
}
.grammar-line {
  font-size: 13.5px;
  line-height: 1.95;
}
.grammar-eg {
  margin-top: 10px;
  padding: 9px 11px;
  background: #f7f9fe;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.95;
}

/* ---------------- 语文：生字 ---------------- */
.section-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 26px 0 14px;
}
.section-title h2 {
  margin: 0;
  font-size: 17px;
}
.hint {
  font-size: 12px;
  color: #8a94a8;
}

/* 数学：学段考点梳理 */
.stage-intro {
  margin: -6px 0 14px;
  padding: 9px 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: #7a5a00;
  background: #fffaf0;
  border-radius: 10px;
}
.stage-intro[hidden] {
  display: none;
}
.section-title[hidden] {
  display: none;
}

.char-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(108px, 1fr));
  gap: 10px;
  margin-bottom: 10px;
}

.char-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 8px;
  text-align: center;
  cursor: pointer;
  transition: 0.18s;
}
.char-card:hover {
  border-color: var(--blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.char-card.speaking {
  border-color: var(--green);
  background: var(--green-soft);
}
.char-big {
  font-family: "Kaiti SC", "KaiTi", "STKaiti", serif;
  font-size: 34px;
  line-height: 1.15;
  color: var(--ink);
}
.char-py {
  font-size: 12px;
  color: var(--blue);
  margin-top: 3px;
  letter-spacing: 0.4px;
}
.char-word {
  font-size: 12px;
  color: var(--ink-2);
  margin-top: 3px;
}
.char-book {
  font-size: 10px;
  color: #9aa4b8;
  margin-top: 3px;
}
.quiz-on .char-py {
  filter: blur(5px);
}
.quiz-on .char-card.revealed .char-py {
  filter: none;
}

/* ---------------- 语文：诗文 ---------------- */
.poem-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 16px;
}

.poem-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
  border-left: 4px solid var(--amber);
  display: flex;
  flex-direction: column;
}
.poem-top {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.poem-title {
  margin: 0;
  font-size: 17px;
  font-family: "Kaiti SC", "KaiTi", "STKaiti", serif;
}
.poem-meta {
  font-size: 12px;
  color: var(--ink-2);
  margin-top: 3px;
}
.poem-tools {
  margin-left: auto;
  display: flex;
  gap: 6px;
}
.poem-body {
  margin: 12px 0 0;
  font-family: "Kaiti SC", "KaiTi", "STKaiti", serif;
  font-size: 16px;
  line-height: 2;
  color: var(--ink);
  white-space: pre-wrap;
  transition: filter 0.2s;
}
.poem-line {
  border-radius: 6px;
}
.poem-line.speaking-line {
  background: #fff6e0;
  box-shadow: 0 0 0 5px #fff6e0;
}
.poem-card.mask .poem-body {
  filter: blur(7px);
  user-select: none;
}
.poem-card.mask .mask-note {
  display: block;
}
.mask-note {
  display: none;
  font-size: 12px;
  color: var(--amber);
  margin-top: 8px;
}
.poem-note {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--ink-2);
  background: #fffdf5;
  border-radius: 8px;
  padding: 8px 10px;
  line-height: 1.7;
}
.poem-note b {
  color: var(--amber);
}

/* ---------------- 提示 ---------------- */
.empty {
  padding: 36px;
  text-align: center;
  color: #8a94a8;
  font-size: 14px;
  background: var(--card);
  border-radius: var(--radius);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translate(-50%, 20px);
  background: rgba(30, 36, 48, 0.92);
  color: #fff;
  font-size: 13px;
  padding: 10px 18px;
  border-radius: 10px;
  opacity: 0;
  pointer-events: none;
  transition: 0.25s;
  z-index: 99;
}
.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

.foot {
  text-align: center;
  font-size: 12px;
  color: #98a2b6;
  padding: 0 20px 26px;
}

/* ---------------- 数学：知识点 ---------------- */
.point-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 14px;
}

.point-card {
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 15px 17px;
  border-top: 3px solid var(--blue);
}

.point-head {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.point-cat {
  font-size: 11px;
  color: var(--blue);
  background: var(--blue-soft);
  padding: 3px 8px;
  border-radius: 6px;
}
.point-title {
  margin: 0;
  font-size: 15px;
}
.point-body {
  font-size: 13.5px;
  line-height: 1.95;
  color: var(--ink);
}
.point-line {
  padding-left: 0;
}
.point-tip {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: #9a6a00;
  background: #fffaf0;
  border-radius: 8px;
  padding: 7px 10px;
}
.point-tip b {
  color: #c47f00;
}

/* ---------------- 数学：口算练习 ---------------- */
.quiz-panel {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px 16px;
}

.quiz-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.quiz-opts {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--ink-2);
}
.quiz-opts select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 8px;
  font-size: 13px;
  background: #fff;
  color: var(--ink);
  outline: none;
}

.quiz-main {
  text-align: center;
  padding: 6px 0 2px;
}

.quiz-question {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 1px;
  min-height: 42px;
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

.quiz-form {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 12px;
  flex-wrap: wrap;
}
#quizInput {
  width: 190px;
  text-align: center;
  font-size: 18px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  outline: none;
  transition: 0.2s;
}
#quizInput:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.12);
}

.quiz-hint {
  margin: 8px 0 0;
  font-size: 12px;
  color: #98a2b6;
}

.quiz-feedback {
  min-height: 26px;
  margin-top: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-2);
}
.quiz-feedback.ok {
  color: var(--green);
}
.quiz-feedback.bad {
  color: #d64545;
}

.quiz-stats {
  margin-top: 8px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  display: flex;
  gap: 18px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--ink-2);
}
.quiz-stats b {
  color: var(--ink);
  font-size: 15px;
}

/* ---------------- 作文：类别筛选 ---------------- */
.type-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.type-chip {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-2);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: 0.18s;
}
.type-chip:hover {
  border-color: var(--amber);
  color: #b87400;
}
.type-chip.active {
  background: #fff3e0;
  border-color: var(--amber);
  color: #b87400;
  font-weight: 600;
}

/* ---------------- 作文：好词 ---------------- */
.essay-block {
  margin-bottom: 24px;
}
.block-title {
  margin: 0 0 12px;
  font-size: 16px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.block-title small {
  font-size: 12px;
  font-weight: 400;
  color: #8a94a8;
}

.word-themes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 12px;
}
.word-theme {
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 12px 14px;
}
.theme-name {
  font-size: 12px;
  color: var(--blue);
  background: var(--blue-soft);
  padding: 3px 9px;
  border-radius: 6px;
}
.word-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.word-tag {
  font-size: 14px;
  padding: 6px 12px;
  background: #f7f9fe;
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  transition: 0.18s;
  font-family: "Kaiti SC", "KaiTi", "STKaiti", serif;
}
.word-tag:hover {
  border-color: var(--blue);
  color: var(--blue);
  background: #fff;
}
.word-tag.speaking {
  background: var(--green-soft);
  border-color: var(--green);
  color: var(--green);
}

/* ---------------- 作文：好句好段 ---------------- */
.quote-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 12px;
}
.quote-card {
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 14px 16px;
  border-left: 3px solid var(--amber);
  transition: 0.18s;
}
.quote-card.speaking {
  border-left-color: var(--green);
  background: var(--green-soft);
}
.quote-tag {
  font-size: 11px;
  color: #b87400;
  background: #fff3e0;
  padding: 2px 8px;
  border-radius: 6px;
}
.quote-text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.95;
  font-family: "Kaiti SC", "KaiTi", "STKaiti", serif;
}
.quote-card .play-btn {
  margin-top: 10px;
}

/* ---------------- 作文：范文 ---------------- */
.essay-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 20px;
  margin-bottom: 16px;
  border-top: 3px solid var(--blue);
}
.essay-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.essay-title {
  margin: 0;
  font-size: 17px;
  font-family: "Kaiti SC", "KaiTi", "STKaiti", serif;
}
.essay-meta {
  font-size: 12px;
  color: var(--ink-2);
}
.essay-head .play-btn {
  margin-left: auto;
}
.essay-body {
  margin: 12px 0 0;
  font-family: "Kaiti SC", "KaiTi", "STKaiti", serif;
  font-size: 15px;
  line-height: 2.1;
}
.essay-para {
  text-indent: 2em;
  margin: 0 0 6px;
  border-radius: 4px;
  transition: 0.2s;
}
.essay-para.speaking {
  background: #fff6e0;
  box-shadow: 0 0 0 5px #fff6e0;
}
.essay-review {
  margin-top: 12px;
  padding: 9px 12px;
  background: #f0f7ff;
  border-radius: 8px;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--ink-2);
}
.essay-review b {
  color: var(--blue);
}

/* ---------------- 作文：技法 ---------------- */
.tip-list {
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 4px 18px;
}
.tip-item {
  display: flex;
  gap: 10px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 13.5px;
  line-height: 1.8;
}
.tip-item:last-child {
  border-bottom: 0;
}
.tip-no {
  flex: none;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  border-radius: 50%;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 11px;
  font-weight: 700;
  display: grid;
  place-items: center;
}

/* ---------------- 道德与法治：情景判断 ---------------- */
.point-head .play-btn {
  margin-left: auto;
  flex: none;
}

.check-stats {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--ink-2);
  background: #fff;
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 10px 16px;
  margin-bottom: 12px;
}
.check-stats b {
  color: var(--ink);
  font-size: 14px;
}

.check-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.check-item {
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 14px 16px;
}
.check-q {
  display: flex;
  gap: 9px;
  font-size: 14px;
  line-height: 1.8;
}
.check-no {
  flex: none;
  width: 20px;
  height: 20px;
  margin-top: 3px;
  border-radius: 50%;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 11px;
  font-weight: 700;
  display: grid;
  place-items: center;
}
.check-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}
.check-btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-2);
  padding: 5px 16px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: 0.18s;
}
.check-btn:hover {
  border-color: var(--blue);
  color: var(--blue);
}
.check-btn:disabled {
  cursor: default;
  opacity: 0.85;
}
.check-btn.right {
  background: var(--green-soft);
  border-color: var(--green);
  color: var(--green);
  font-weight: 600;
  opacity: 1;
}
.check-btn.wrong {
  background: #ffeeee;
  border-color: #e08b8b;
  color: #c94a4a;
  font-weight: 600;
  opacity: 1;
}
.check-why {
  display: none;
  margin-top: 10px;
  padding: 8px 11px;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--ink-2);
  background: #f7f9fe;
  border-radius: 8px;
}
.check-why b {
  color: var(--blue);
}
.check-item.judged .check-why {
  display: block;
}

/* ---------------- 科学：选择题 ---------------- */
.q-opts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}
.q-opt {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-2);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 13.5px;
  line-height: 1.6;
  text-align: left;
  max-width: 100%;
  cursor: pointer;
  transition: 0.18s;
}
.q-opt:hover {
  border-color: var(--blue);
  color: var(--blue);
}
.q-opt:disabled {
  cursor: default;
  opacity: 0.85;
}
.q-opt.right {
  background: var(--green-soft);
  border-color: var(--green);
  color: var(--green);
  font-weight: 600;
  opacity: 1;
}
.q-opt.wrong {
  background: #ffeeee;
  border-color: #e08b8b;
  color: #c94a4a;
  font-weight: 600;
  opacity: 1;
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 780px) {
  .topbar {
    padding: 8px 12px;
    gap: 8px;
  }
  .brand {
    gap: 8px;
  }
  .logo {
    width: 32px;
    height: 32px;
    border-radius: 9px;
    box-shadow: 0 1px 6px rgba(47, 111, 237, 0.12);
  }
  .brand-text h1 {
    font-size: 16px;
  }
  .brand-text p {
    display: none;
  }
  .topbar-tools {
    order: 2;
    margin-left: auto;
    width: auto;
    flex: none;
    gap: 8px;
  }
  .speed {
    font-size: 12px;
    gap: 5px;
  }
  .speed input {
    width: 56px;
  }
  #rateVal {
    width: 26px;
    font-size: 12px;
  }
  .ghost-btn {
    padding: 6px 10px;
    font-size: 12px;
    border-radius: 8px;
  }
  .tabs {
    order: 3;
    width: 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .tabs::-webkit-scrollbar {
    display: none;
  }
  .tab {
    flex: none;
    padding: 6px 12px;
    font-size: 13px;
  }
  main {
    padding: 14px 14px 30px;
  }
  input[type="search"] {
    width: 100%;
  }
  .filters {
    width: 100%;
  }
  .poem-list {
    grid-template-columns: 1fr;
  }
  .word-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  }
  .point-list {
    grid-template-columns: 1fr;
  }
  .quote-list {
    grid-template-columns: 1fr;
  }
  .word-themes {
    grid-template-columns: 1fr;
  }
  .pattern-grid {
    grid-template-columns: 1fr;
  }
  .grammar-grid {
    grid-template-columns: 1fr;
  }
  .quiz-question {
    font-size: 22px;
  }
  #quizInput {
    width: 130px;
    font-size: 16px;
  }
  .quiz-stats {
    gap: 12px;
  }
}

@media (max-width: 400px) {
  .topbar {
    padding: 8px 10px;
  }
  .brand {
    gap: 6px;
  }
  .brand-text h1 {
    font-size: 15px;
    letter-spacing: 0;
  }
  .speed {
    gap: 4px;
  }
  .speed input {
    width: 48px;
  }
  .ghost-btn {
    padding: 6px 8px;
  }
  .tab {
    padding: 6px 10px;
    font-size: 12.5px;
  }
}

@media print {
  .topbar,
  .subbar,
  .foot,
  .play-btn,
  .play-unit,
  .poem-tools {
    display: none !important;
  }
  .poem-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ddd;
  }
}