/* ============================================================
   灵灵的 AI 启蒙乐园 —— 全局设计系统
   面向小学 2-3 年级 · 大字体 · 高对比 · 圆润可爱
   ============================================================ */

:root {
  /* 品牌色：三位 AI 朋友 */
  --ds-blue:   #2f6bff;   /* DeepSeek 蓝 */
  --doubao:    #ff7a3c;   /* 豆包 橙 */
  --qwen:      #8b5cf6;   /* 千问 紫 */
  --panda:     #2bbf7e;   /* 灵灵 熊猫绿 */

  /* 背景与中性色 */
  --bg:        #fff7ec;
  --bg-card:   #ffffff;
  --ink:       #2a2a3a;
  --ink-soft:  #6b6b7b;
  --line:      #ffe3c2;

  /* 功能色 */
  --good:      #21c07a;
  --bad:       #ff5470;
  --warn:      #ffc23c;
  --star:      #ffce3a;

  /* 圆角与阴影 */
  --r-lg: 28px;
  --r-md: 18px;
  --r-sm: 12px;
  --shadow: 0 10px 0 rgba(0,0,0,.06), 0 18px 40px rgba(255,140,60,.18);
  --shadow-sm: 0 6px 0 rgba(0,0,0,.05), 0 10px 22px rgba(255,140,60,.14);

  --font: "Baloo 2", "Comic Sans MS", "PingFang SC", "Microsoft YaHei", "HarmonyOS Sans SC", sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

body {
  background-image:
    radial-gradient(circle at 12% 8%, #ffe8c8 0, transparent 28%),
    radial-gradient(circle at 88% 4%, #d8f3e6 0, transparent 26%),
    radial-gradient(circle at 50% 100%, #ffe2d2 0, transparent 40%);
  min-height: 100vh;
}

/* 拼音 ruby */
ruby { ruby-position: over; }
rt   { font-size: .55em; color: var(--ink-soft); font-weight: 600; }

/* ---------- 顶部导航 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 14px;
  padding: 12px 20px;
  background: rgba(255,247,236,.92);
  backdrop-filter: blur(8px);
  border-bottom: 3px solid var(--line);
}
.topbar .brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 22px; color: var(--panda);
  text-decoration: none;
}
.topbar .brand svg { width: 40px; height: 40px; }
.topbar .spacer { flex: 1; }

.btn {
  border: none; cursor: pointer;
  font-family: var(--font); font-weight: 800; font-size: 18px;
  padding: 12px 22px; border-radius: 999px;
  background: var(--ds-blue); color: #fff;
  box-shadow: 0 5px 0 rgba(0,0,0,.18);
  transition: transform .08s, box-shadow .08s, filter .15s;
  user-select: none;
}
.btn:active { transform: translateY(4px); box-shadow: 0 1px 0 rgba(0,0,0,.18); }
.btn.ghost   { background: #fff; color: var(--ink); box-shadow: 0 5px 0 var(--line); }
.btn.warn    { background: var(--warn); color: #5b4300; }
.btn.green   { background: var(--panda); }
.btn.orange  { background: var(--doubao); }
.btn.purple  { background: var(--qwen); }
.btn.big     { font-size: 22px; padding: 16px 32px; }
.btn[disabled]{ filter: grayscale(.6) opacity(.6); cursor: not-allowed; }

/* 老师模式开关 */
.teacher-switch {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 800; color: var(--ink-soft); font-size: 15px;
  cursor: pointer; user-select: none;
}
.teacher-switch .track {
  width: 56px; height: 30px; border-radius: 999px;
  background: #e7e0d3; position: relative; transition: background .2s;
}
.teacher-switch .knob {
  position: absolute; top: 3px; left: 3px;
  width: 24px; height: 24px; border-radius: 50%;
  background: #fff; box-shadow: 0 2px 4px rgba(0,0,0,.2);
  transition: left .2s;
}
body.teacher-on .teacher-switch .track { background: var(--qwen); }
body.teacher-on .teacher-switch .knob  { left: 29px; }

/* ---------- 页面容器 ---------- */
.wrap { max-width: 980px; margin: 0 auto; padding: 24px 20px 80px; }

.page-title {
  text-align: center; margin: 6px 0 4px;
  font-size: 34px; font-weight: 900; color: var(--ink);
}
.page-sub { text-align: center; color: var(--ink-soft); font-size: 18px; margin-top: 0; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--bg-card);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow);
  padding: 26px;
  margin: 22px 0;
  border: 3px solid #fff;
}
.card h2 { font-size: 26px; margin: 0 0 8px; }
.card h3 { font-size: 21px; margin: 18px 0 8px; }
.card p, .card li { font-size: 19px; line-height: 1.7; }

.badge-step {
  display: inline-block; background: var(--star); color: #6b4e00;
  font-weight: 900; border-radius: 999px; padding: 4px 16px; font-size: 16px;
  margin-bottom: 8px;
}

/* 比喻框 / 提示框 */
.tip {
  background: #eaf2ff; border-left: 8px solid var(--ds-blue);
  border-radius: 14px; padding: 14px 18px; margin: 14px 0; font-size: 18px;
}
.tip.fun  { background: #fff1e8; border-color: var(--doubao); }
.tip.song { background: #f3ecff; border-color: var(--qwen); }
.tip b { color: var(--ds-blue); }

/* 儿歌口诀 */
.chant {
  background: linear-gradient(135deg,#fff3d6,#ffe7cf);
  border: 3px dashed var(--doubao);
  border-radius: var(--r-md);
  padding: 18px 22px; text-align: center;
  font-size: 22px; font-weight: 800; line-height: 2; color: #a4521b;
}

/* ---------- 速记/口袋（老师模式） ---------- */
.teacher-only { display: none; }
body.teacher-on .teacher-only { display: block; }
body.teacher-on .student-only { display: none; }

.teacher-box {
  background: #f4f0ff; border: 3px solid var(--qwen);
  border-radius: var(--r-md); padding: 20px; margin: 18px 0;
}
.teacher-box h3 { color: var(--qwen); margin-top: 0; }
.teacher-box table { width: 100%; border-collapse: collapse; font-size: 17px; }
.teacher-box td, .teacher-box th { border: 2px solid #e6dcff; padding: 8px 10px; text-align: left; }
.teacher-box th { background: #efe7ff; }

/* ---------- 互动：拖拽分类 ---------- */
.drag-pool { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin: 16px 0; }
.chip {
  display: inline-flex; flex-direction: column; align-items: center; gap: 4px;
  background: #fff; border: 3px solid var(--line);
  border-radius: var(--r-sm); padding: 10px 14px; cursor: grab;
  font-size: 17px; font-weight: 700; box-shadow: var(--shadow-sm);
  touch-action: none; user-select: none;
}
.chip svg { width: 56px; height: 56px; }
.chip.dragging { opacity: .5; }

.bins { display: flex; gap: 18px; flex-wrap: wrap; justify-content: center; margin-top: 20px; }
.bin {
  flex: 1 1 220px; min-height: 150px;
  border-radius: var(--r-md); padding: 14px;
  border: 4px dashed #cfcfe0; text-align: center;
  transition: background .15s, border-color .15s;
}
.bin.is-ai   { border-color: var(--ds-blue); background: #eef4ff; }
.bin.not-ai  { border-color: var(--ink-soft); background: #f3f3f6; }
.bin.over    { background: #fff4dc; border-color: var(--doubao); }
.bin h3 { margin: 4px 0 10px; }
.bin .slot { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }

/* ---------- 互动：选择题 / 红绿灯 ---------- */
.quiz { margin: 16px 0; }
.quiz .q { font-size: 20px; font-weight: 800; margin-bottom: 12px; }
.options { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
.option {
  border: 3px solid var(--line); background: #fff;
  border-radius: var(--r-md); padding: 14px 16px; cursor: pointer;
  font-size: 18px; font-weight: 700; text-align: center;
  box-shadow: var(--shadow-sm); transition: transform .08s;
}
.option:active { transform: scale(.97); }
.option.correct { background: #e3fbef; border-color: var(--good); }
.option.wrong   { background: #ffe8ec; border-color: var(--bad); }
.feedback { margin-top: 12px; font-size: 19px; font-weight: 800; min-height: 28px; }
.feedback.ok  { color: var(--good); }
.feedback.no  { color: var(--bad); }

/* ---------- 徽章 ---------- */
.badge-wall { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; margin: 18px 0; }
.badge {
  width: 120px; text-align: center; opacity: .35; filter: grayscale(1);
  transition: .3s; font-weight: 800; font-size: 15px;
}
.badge.earned { opacity: 1; filter: none; transform: scale(1.04); }
.badge svg { width: 96px; height: 96px; }

/* 弹出奖励 */
.reward-pop {
  position: fixed; inset: 0; display: none; place-items: center;
  background: rgba(0,0,0,.45); z-index: 100;
}
.reward-pop.show { display: grid; animation: fade .25s; }
.reward-card {
  background: #fff; border-radius: var(--r-lg); padding: 30px 36px;
  text-align: center; box-shadow: var(--shadow); animation: pop .35s;
}
.reward-card svg { width: 150px; height: 150px; }
.reward-card h2 { color: var(--doubao); font-size: 28px; margin: 8px 0; }
@keyframes pop { from { transform: scale(.5); opacity: 0; } to { transform: scale(1); opacity: 1; } }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }

/* ---------- 课程卡（首页） ---------- */
.lesson-grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.lesson-card {
  display: block; text-decoration: none; color: var(--ink);
  background: #fff; border-radius: var(--r-lg); padding: 20px;
  box-shadow: var(--shadow); border: 4px solid #fff;
  transition: transform .12s, border-color .12s;
  position: relative; overflow: hidden;
}
.lesson-card:hover { transform: translateY(-6px); border-color: var(--star); }
.lesson-card .num {
  position: absolute; top: -10px; right: -6px; font-size: 70px;
  font-weight: 900; color: #fff4dc; line-height: 1;
}
.lesson-card .ico svg { width: 80px; height: 80px; }
.lesson-card h3 { margin: 8px 0 4px; font-size: 22px; }
.lesson-card p  { margin: 0; color: var(--ink-soft); font-size: 16px; }
.lesson-card .done-flag {
  display: none; position: absolute; top: 12px; left: 12px;
  background: var(--good); color: #fff; border-radius: 999px;
  font-size: 13px; font-weight: 800; padding: 3px 10px;
}
.lesson-card.done .done-flag { display: inline-block; }

/* ---------- 底部课间导航 ---------- */
.lesson-nav {
  display: flex; justify-content: space-between; gap: 12px;
  margin-top: 30px; flex-wrap: wrap;
}

/* ---------- 角色对话气泡 ---------- */
.speech {
  display: flex; align-items: flex-start; gap: 14px; margin: 16px 0;
}
.speech .avatar svg { width: 84px; height: 84px; }
.speech .bubble {
  position: relative; background: #fff; border: 3px solid var(--line);
  border-radius: 18px; padding: 14px 18px; font-size: 19px; max-width: 720px;
  box-shadow: var(--shadow-sm);
}
.speech .bubble::before {
  content: ""; position: absolute; left: -14px; top: 24px;
  border: 8px solid transparent; border-right-color: var(--line);
}
.speech.ds   .bubble { border-color: var(--ds-blue); }
.speech.doubao .bubble { border-color: var(--doubao); }
.speech.qwen .bubble { border-color: var(--qwen); }
.speech.panda .bubble { border-color: var(--panda); }

/* 手势提示 */
.hand-hint { text-align:center; color: var(--ink-soft); font-size: 16px; margin: 8px 0; }

/* 进度条 */
.progress-line { height: 16px; background: #eee3d2; border-radius: 999px; overflow: hidden; margin: 10px 0; }
.progress-line > span { display: block; height: 100%; background: linear-gradient(90deg,var(--panda),var(--ds-blue)); width: 0; transition: width .5s; }

/* 响应式 */
@media (max-width: 640px) {
  .page-title { font-size: 27px; }
  .card { padding: 18px; }
  .options { grid-template-columns: 1fr; }
  .topbar .brand { font-size: 18px; }
  .btn { font-size: 16px; padding: 10px 16px; }
}

/* 打印（家长可打印活动页） */
@media print {
  .topbar, .lesson-nav, .btn, .reward-pop { display: none !important; }
  body { background: #fff; }
  .card { box-shadow: none; border: 1px solid #ccc; page-break-inside: avoid; }
}