/* 拼音王国 —— 样式
   ① 令牌 ② 骨架 ③ 顶栏 ④ 首页 ⑤ 课程页 ⑥ 视频 ⑦ 字母/儿歌/声调 ⑧ 书写 ⑨ 练习 ⑩ 家长 ⑪ 页脚 ⑫ 宽屏 ⑬ 窄屏 */

/* ① 令牌 ---------------------------------------------------------------- */
:root {
  --paper: #fdfaf2;
  --paper-2: #fffdf8;
  --ink: #24322c;
  --ink-2: #5a6b63;
  --dim: #8a978f;
  --green: #2f7d5b;
  --green-d: #1f5b41;
  --green-soft: #e8f3ec;
  --amber: #e79a2c;
  --amber-soft: #fdf1dd;
  --rose: #c2564e;
  --line: #e6e2d6;
  --shadow: 0 2px 10px rgba(36, 50, 44, .06);
  --radius: 18px;
  --shell: 760px;
  --topbar-h: 56px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.7 "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  /* 刷新时不要从下往上滚；内容长出来时也别跳 */
  overflow-anchor: none;
}

[hidden] { display: none !important; }

h1, h2, h3, p, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
b, strong { font-weight: 700; }

/* 拼音字母统一用楷体族（教拼音的标准字体），没有就退回宋体 */
.pinyin {
  font-family: "Kaiti SC", "STKaiti", "KaiTi", "SimSun", "Songti SC", serif;
  font-weight: 400;
  line-height: 1;
}

/* ② 骨架 ---------------------------------------------------------------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px 16px 40px;
  display: grid;
  grid-template-columns: minmax(0, 1fr); /* 不写会按内容撑宽整页 */
  gap: 26px;
}

.sect {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 18px;
  box-shadow: var(--shadow);
}

.sect__title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  letter-spacing: .02em;
}

.sect__no {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--green-soft);
  color: var(--green-d);
  font-size: 15px;
  flex: 0 0 auto;
}

.sect__note {
  margin-top: 8px;
  color: var(--ink-2);
  font-size: 14.5px;
}

.note { color: var(--ink-2); font-size: 14px; }

/* ③ 顶栏 ---------------------------------------------------------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 16px;
  background: rgba(253, 250, 242, .92);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--line);
}

.topbar__brand {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--green-d);
}
.topbar__brand span { color: var(--amber); }

.topbar__nav {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 14.5px;
  color: var(--ink-2);
}
.topbar__nav a.is-on { color: var(--green-d); font-weight: 700; }
.topbar__me { color: var(--dim); }
.topbar__me a { color: var(--green); text-decoration: underline; text-underline-offset: 3px; }

/* ④ 首页 ---------------------------------------------------------------- */
.hero {
  padding: 22px 20px 26px;
  border-radius: 22px;
  background:
    radial-gradient(120% 90% at 12% 0%, #f2fbf6 0%, rgba(242, 251, 246, 0) 60%),
    linear-gradient(180deg, #f7fbf7 0%, var(--paper-2) 100%);
  border: 1px solid var(--line);
  text-align: center;
}

.hero__kicker {
  font-size: 13px;
  letter-spacing: .22em;
  color: var(--dim);
}

.hero__title {
  margin-top: 6px;
  font-size: 40px;
  letter-spacing: .06em;
  color: var(--green-d);
}

.hero__lead {
  margin-top: 10px;
  color: var(--ink-2);
  font-size: 15.5px;
}

.hero__letters {
  margin-top: 20px;
  display: flex;
  justify-content: center;
  gap: 14px;
  color: var(--green);
  opacity: .32;
  font-size: 34px;
}
.hero__letters span:nth-child(2n) { color: var(--amber); }

.map__list { margin-top: 14px; }

.stop {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border-radius: 16px;
  border: 1px solid var(--green);
  background: linear-gradient(180deg, #f4fbf6, #ffffff);
  transition: transform .16s ease, box-shadow .16s ease;
}
.stop:hover { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(47, 125, 91, .16); }
.stop:active { transform: translateY(0) scale(.995); }

.stop__no {
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--green);
  color: #fff;
  font-weight: 700;
}

.stop__main { display: grid; gap: 2px; min-width: 0; }

.stop__letters {
  font-family: "Kaiti SC", "STKaiti", "KaiTi", "SimSun", serif;
  font-size: 30px;
  letter-spacing: .18em;
  color: var(--green-d);
  line-height: 1.2;
}

.stop__meta { font-size: 13.5px; color: var(--ink-2); }

.stop__go { margin-left: auto; color: var(--green); font-size: 22px; }

.map__rest {
  margin-top: 12px;
  font-size: 13.5px;
  color: var(--dim);
  text-align: center;
}

.how__steps {
  margin-top: 12px;
  display: grid;
  gap: 10px;
  counter-reset: how;
}

.how__steps li {
  counter-increment: how;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 10px;
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--green-soft);
}
.how__steps li::before {
  content: counter(how);
  grid-row: 1 / span 2;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #fff;
  color: var(--green-d);
  font-size: 13px;
  font-weight: 700;
}
.how__steps b { font-size: 15.5px; }
.how__steps span { grid-column: 2; font-size: 13.5px; color: var(--ink-2); }

/* ⑤ 课程页 -------------------------------------------------------------- */
.shell--lesson { gap: 20px; }

.lesson-head {
  text-align: center;
  padding: 16px 12px 20px;
}

.lesson-head__letters {
  font-family: "Kaiti SC", "STKaiti", "KaiTi", "SimSun", serif;
  font-size: 64px;
  letter-spacing: .16em;
  color: var(--green-d);
  margin-top: 4px;
  line-height: 1.1;
}

.lesson-head__no {
  color: var(--dim);
  font-size: 13.5px;
  letter-spacing: .12em;
}

.goals {
  margin: 16px auto 0;
  max-width: 520px;
  display: grid;
  gap: 8px;
  text-align: left;
}
.goals li {
  position: relative;
  padding: 10px 12px 10px 38px;
  border-radius: 12px;
  background: var(--green-soft);
  font-size: 15.5px;
}
.goals li::before {
  content: "✓";
  position: absolute;
  left: 12px;
  top: 9px;
  color: var(--green);
  font-weight: 700;
}

/* ⑥ 视频 ---------------------------------------------------------------- */
.sect--video { border-color: #cfe3d7; }

.video-zone { margin-top: 14px; display: grid; gap: 14px; }

.vcard {
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: #fff;
}

.vcard__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 14px;
  background: var(--green-soft);
  font-size: 14px;
}
.vcard__head b { font-size: 15.5px; color: var(--green-d); }
.vcard__head span { color: var(--ink-2); }
.vcard__time { margin-left: auto; color: var(--dim); font-size: 13px; }

.vcard video {
  display: block;
  width: 100%;
  max-height: 62vh;
  background: #000;
}

.vcard__foot {
  padding: 8px 14px;
  font-size: 12.5px;
  color: var(--dim);
}

.locked {
  display: grid;
  gap: 12px;
  padding: 22px 18px;
  border-radius: 14px;
  border: 1px dashed #cfe3d7;
  background: linear-gradient(180deg, #f6fbf8, #fff);
  text-align: center;
}
.locked__icon { font-size: 30px; }
.locked__title { font-size: 17px; font-weight: 700; color: var(--green-d); }
.locked__text { font-size: 14px; color: var(--ink-2); }
.locked__btn {
  justify-self: center;
  padding: 11px 26px;
  border-radius: 999px;
  background: var(--green);
  color: #fff;
  font-size: 15.5px;
  font-weight: 700;
}
.locked__btn:hover { background: var(--green-d); }

.pending {
  padding: 18px;
  border-radius: 14px;
  background: var(--amber-soft);
  color: #7a5312;
  font-size: 14.5px;
  text-align: center;
}

/* ⑦ 字母 / 儿歌 / 声调 ----------------------------------------------- */
.letters {
  margin-top: 14px;
  display: grid;
  gap: 12px;
}

.lcard {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  background: #fff;
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  text-align: left;
  cursor: pointer;
  transition: border-color .16s ease, box-shadow .16s ease;
}
.lcard:hover { border-color: #cfe3d7; box-shadow: 0 4px 14px rgba(47, 125, 91, .12); }
.lcard.is-big { border-color: var(--green); background: linear-gradient(180deg, #f7fdf9, #fff); }

.lcard__letter {
  font-family: "Kaiti SC", "STKaiti", "KaiTi", "SimSun", serif;
  font-size: 64px;
  line-height: 1;
  color: var(--green-d);
  text-align: center;
  transition: transform .2s ease;
}
.lcard.is-big .lcard__letter { transform: scale(1.12); color: var(--green); }

.lcard__body { display: grid; gap: 4px; min-width: 0; }
.lcard__rhyme { font-size: 16px; }
.lcard__meta { font-size: 13.5px; color: var(--ink-2); }

.say {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-left: 6px;
  padding: 1px 8px 1px 6px;
  border-radius: 999px;
  background: var(--amber-soft);
  color: #8a5a10;
  font-size: 12.5px;
  vertical-align: 2px;
  white-space: nowrap;
}
.say::before { content: "🔊"; font-size: 12px; }

.rhyme {
  margin-top: 14px;
  padding: 16px;
  border-radius: 14px;
  background: linear-gradient(180deg, #fff8ea, #fffdf7);
  border: 1px solid #f0e2c6;
}
.rhyme__title { font-size: 15px; font-weight: 700; color: #8a5a10; }
.rhyme__lines { margin-top: 10px; display: grid; gap: 6px; }
.rhyme__lines li {
  font-size: 18px;
  letter-spacing: .06em;
  color: #6b4a11;
}
.rhyme__note { margin-top: 10px; font-size: 13px; color: #9a7a3e; }

.tones {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.tone {
  padding: 12px 8px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  text-align: center;
  cursor: pointer;
  display: grid;
  gap: 4px;
  justify-items: center;
}
.tone:hover { border-color: var(--green); }
.tone.is-on { border-color: var(--green); background: var(--green-soft); }
.tone__svg { width: 64px; height: 26px; }
.tone__svg path { fill: none; stroke: var(--green); stroke-width: 5; stroke-linecap: round; }
.tone__name { font-size: 14px; font-weight: 700; }
.tone__tip { font-size: 12px; color: var(--ink-2); line-height: 1.4; }

.tone-grid {
  margin-top: 14px;
  display: grid;
  gap: 8px;
}

.tone-row {
  display: grid;
  grid-template-columns: 46px repeat(4, minmax(0, 1fr));
  gap: 8px;
  align-items: center;
}
.tone-row__letter {
  font-family: "Kaiti SC", "STKaiti", "KaiTi", "SimSun", serif;
  font-size: 26px;
  color: var(--dim);
  text-align: center;
}
.tone-cell {
  padding: 10px 4px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  font-family: "Kaiti SC", "STKaiti", "KaiTi", "SimSun", serif;
  font-size: 30px;
  color: var(--green-d);
  cursor: pointer;
  transition: transform .12s ease, background .12s ease;
}
.tone-cell:hover { background: var(--green-soft); }
.tone-cell.is-hit { background: var(--green); color: #fff; transform: scale(1.06); }

.tone-hint {
  margin-top: 10px;
  min-height: 24px;
  font-size: 14px;
  color: var(--ink-2);
  text-align: center;
}

/* ⑧ 书写 ---------------------------------------------------------------- */
.writing { margin-top: 14px; display: grid; gap: 14px; }

.wcard {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  background: #fff;
}
.wcard__top { display: flex; align-items: baseline; gap: 10px; }
.wcard__letter {
  font-family: "Kaiti SC", "STKaiti", "KaiTi", "SimSun", serif;
  font-size: 34px;
  color: var(--green-d);
}
.wcard__zone { font-size: 13px; color: var(--dim); }

.grid4 {
  display: block;
  width: 100%;
  height: auto;
  margin: 10px 0 6px;
  border-radius: 10px;
  background: #fff;
}
.grid4 .line { stroke: #bcd7c7; stroke-width: 1.5; }
.grid4 .line--mid { stroke: #7fb99a; stroke-dasharray: 6 5; }
.grid4 .letter { fill: var(--green-d); font-family: "Kaiti SC", "STKaiti", "KaiTi", "SimSun", serif; }
.grid4 .hint { fill: #cfe0d6; font-size: 13px; font-family: sans-serif; }

.steps { display: grid; gap: 6px; margin-top: 8px; counter-reset: st; }
.steps li {
  counter-increment: st;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 8px;
  font-size: 14px;
  color: var(--ink-2);
  align-items: start;
}
.steps li::before {
  content: counter(st);
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--green-soft);
  color: var(--green-d);
  font-size: 12px;
  font-weight: 700;
}

/* ⑨ 练习 ---------------------------------------------------------------- */
.quiz { margin-top: 14px; display: grid; gap: 14px; }

.q {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  background: #fff;
}
.q__title { font-size: 16px; display: flex; gap: 8px; }
.q__no {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--green-soft);
  color: var(--green-d);
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 700;
}
.q__options { margin-top: 10px; display: grid; grid-template-columns: repeat(auto-fit, minmax(66px, 1fr)); gap: 8px; }

.opt {
  padding: 12px 8px;
  border-radius: 12px;
  border: 1.5px solid var(--line);
  background: #fff;
  font-family: "Kaiti SC", "STKaiti", "KaiTi", "SimSun", "Songti SC", serif;
  font-size: 24px;
  line-height: 1.2;
  cursor: pointer;
  transition: border-color .14s ease, background .14s ease, transform .12s ease;
}
.opt:hover { border-color: var(--green); }
.opt:active { transform: scale(.98); }
.opt.is-right { border-color: var(--green); background: var(--green-soft); color: var(--green-d); font-weight: 700; }
.opt.is-wrong { border-color: var(--rose); background: #fdeeed; color: var(--rose); }
.opt:disabled { cursor: default; }
.opt--mark { font-size: 38px; line-height: 1.35; }

.q__why {
  margin-top: 10px;
  font-size: 14px;
  color: var(--ink-2);
  padding: 8px 10px;
  border-radius: 10px;
  background: var(--amber-soft);
}
.q__why.is-bad { background: #fdeeed; color: #8f3f39; }

.quiz__score {
  margin-top: 12px;
  font-size: 14.5px;
  color: var(--green-d);
  text-align: center;
}

/* ⑩ 给家长 -------------------------------------------------------------- */
.sect--parent {
  background: linear-gradient(180deg, #f7faf8, var(--paper-2));
}
.sect--parent h3 { font-size: 15px; color: var(--green-d); margin-top: 14px; }
.sect--parent p { font-size: 14.5px; color: var(--ink-2); margin-top: 6px; }
.sect--parent .tips { margin-top: 8px; display: grid; gap: 6px; }
.sect--parent .tips li {
  padding-left: 20px;
  position: relative;
  font-size: 14.5px;
  color: var(--ink-2);
}
.sect--parent .tips li::before {
  content: "·";
  position: absolute;
  left: 6px;
  top: -2px;
  font-size: 22px;
  color: var(--green);
}
.sect--parent .src {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 12.5px;
  color: var(--dim);
}

/* ⑪ 页脚 ---------------------------------------------------------------- */
.foot {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 16px 34px;
  text-align: center;
  color: var(--ink-2);
  font-size: 13.5px;
}
.foot__dim { color: var(--dim); font-size: 12.5px; margin-top: 4px; }

/* ⑫ 宽屏 ---------------------------------------------------------------- */
@media (min-width: 720px) {
  .hero__title { font-size: 46px; }
  .letters { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
  .lcard { grid-template-columns: minmax(0, 1fr); text-align: center; }
  .lcard__letter { font-size: 72px; }
}

/* ⑬ 窄屏 ---------------------------------------------------------------- */
@media (max-width: 420px) {
  body { font-size: 16px; }
  .shell { padding: 14px 12px 32px; gap: 18px; }
  .hero { padding: 18px 14px 22px; }
  .hero__title { font-size: 34px; }
  .lesson-head__letters { font-size: 52px; }
  .lcard { grid-template-columns: 76px minmax(0, 1fr); gap: 10px; padding: 12px; }
  .lcard__letter { font-size: 54px; }
  .tones { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tone-row { grid-template-columns: 38px repeat(4, minmax(0, 1fr)); gap: 6px; }
  .tone-cell { font-size: 26px; }
  .sect { padding: 16px 14px; }
}