/* ============================================================
   字宝宝 · 大字块汉字启蒙  样式
   原则：高对比 / 大触摸区 / 楷体大字 / 柔和护眼 / 无外部字体依赖
   ============================================================ */
:root{
  --bg:#FFF8EC;
  --paper:#FFFFFF;
  --ink:#2E2A26;
  --ink-soft:#6B6055;
  --line:#EBD9C2;
  --orange:#F28C3C;
  --green:#3FA98F;
  --pink:#EE7A92;
  --star:#FFC53D;
  --shadow:0 10px 30px rgba(94,66,38,.13);
  --kai:"Kaiti SC","STKaiti","KaiTi","楷体","LXGW WenKai","Noto Serif CJK SC",serif;
  --ui:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;min-height:100%}
body{
  background:var(--bg);color:var(--ink);font-family:var(--ui);
  background-image:radial-gradient(#F6E4CC 1px,transparent 1px);
  background-size:22px 22px;
  -webkit-text-size-adjust:100%;
}
button,select{font-family:inherit;font-size:inherit;color:inherit}
button{cursor:pointer}
.hidden{display:none !important}

.view{min-height:100vh;min-height:100dvh;padding:16px;display:flex;flex-direction:column;align-items:center;justify-content:center}
#view-learn{justify-content:flex-start;padding:0;max-width:1000px;margin:0 auto}

/* ---------- 通用按钮 ---------- */
.btn{
  border:none;border-radius:18px;padding:14px 22px;font-weight:700;font-size:17px;
  background:#F3E7D6;color:var(--ink);min-height:56px;
  transition:transform .12s ease,box-shadow .12s ease,filter .12s ease;
}
.btn:active{transform:scale(.95)}
.btn-primary{background:var(--orange);color:#fff;box-shadow:0 6px 0 #D2701F}
.btn-primary:active{box-shadow:0 2px 0 #D2701F}
.btn-huge{font-size:24px;padding:20px 46px;border-radius:24px;min-height:72px}
.btn-ghost{background:transparent;color:var(--ink-soft)}
.btn-action{background:#F6EBDC;min-height:60px;font-size:16px;padding:12px 16px}
.btn-star{background:#FFF1CC;color:#9A6B12}
.icon-btn{
  width:48px;height:48px;border:none;border-radius:16px;background:#F6EBDC;
  font-size:22px;display:grid;place-items:center
}
.icon-btn:active{transform:scale(.92)}

/* ---------- 欢迎页 ---------- */
.welcome-card{
  background:var(--paper);border-radius:32px;box-shadow:var(--shadow);
  padding:36px 30px;max-width:560px;width:100%;text-align:center
}
.welcome-emoji{
  width:110px;height:110px;margin:0 auto 16px;border-radius:28px;
  background:var(--orange);color:#fff;font-family:var(--kai);font-size:72px;
  display:grid;place-items:center;box-shadow:0 8px 0 #D2701F;transform:rotate(-4deg)
}
.welcome-card h1{font-size:32px;margin:6px 0 8px;letter-spacing:2px}
.welcome-sub{color:var(--ink-soft);margin:0 0 22px;font-size:16px}
.parent-note{
  background:#FFF6E7;border:2px dashed #EBCFA5;border-radius:20px;
  padding:16px 18px;text-align:left;margin-bottom:24px;font-size:14px;line-height:1.7;color:#5A4C3C
}
.parent-note strong{display:block;font-size:15px;color:var(--ink);margin-bottom:4px}
.parent-note p{margin:0 0 6px}
.parent-note .ai-note{font-size:12px;color:#8A7863;margin:8px 0 0}
#btnStart{width:100%;margin-bottom:10px}
#btnWelcomeSettings{min-height:44px;font-size:15px}

/* ---------- 学习页 ---------- */
.topbar{
  width:100%;display:flex;align-items:center;justify-content:space-between;
  gap:12px;padding:14px 16px;background:var(--paper);border-bottom:2px solid var(--line)
}
.topbar-title{display:flex;flex-direction:column;align-items:center;line-height:1.35}
.topbar-title span:first-child{font-size:20px;font-weight:800;letter-spacing:2px}
.topbar-title span:last-child{font-size:12px;color:var(--ink-soft)}

.group-strip{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;padding:14px 12px 4px}
.group-chip{
  border:2px solid var(--line);background:var(--paper);border-radius:999px;
  padding:8px 14px;font-size:14px;font-weight:700;color:var(--ink-soft);min-height:44px
}
.group-chip.active{color:#fff;border-color:transparent;box-shadow:0 4px 0 rgba(0,0,0,.08)}
.group-chip.done::after{content:" ✓";color:var(--green)}

.blocks-wrap{flex:1;width:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:14px}
.blocks{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;
  width:100%;max-width:640px
}
.block{
  position:relative;background:var(--paper);border:none;border-radius:28px;
  box-shadow:var(--shadow);aspect-ratio:1/1;min-height:150px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  overflow:hidden;transition:transform .15s ease;touch-action:manipulation
}
.block:active{transform:scale(.95)}
.block::before{content:"";position:absolute;inset:0 auto 0 0;width:10px;background:var(--block-color,#F28C3C)}
.block-char{font-family:var(--kai);font-size:clamp(76px,17vw,140px);line-height:1;color:var(--ink)}
.block-pinyin{font-size:15px;color:var(--ink-soft);margin-top:6px;letter-spacing:2px}
.block-emoji{position:absolute;right:12px;top:10px;font-size:26px;opacity:.9}
.block-done{position:absolute;left:12px;top:10px;font-size:20px}
.block.pop{animation:pop .35s ease}
@keyframes pop{0%{transform:scale(1)}45%{transform:scale(1.06)}100%{transform:scale(1)}}
.blocks-tip{color:var(--ink-soft);font-size:15px;margin:20px 0 4px;text-align:center}

.learn-footer{
  width:100%;display:flex;align-items:center;justify-content:space-between;
  padding:12px 16px calc(16px + env(safe-area-inset-bottom));gap:8px
}
.stars-box{display:flex;align-items:center;gap:6px;font-size:20px;font-weight:800;color:#B27A16}
.star-icon{font-size:24px}

/* ---------- 设置页 ---------- */
.settings-card{
  background:var(--paper);border-radius:28px;box-shadow:var(--shadow);
  width:100%;max-width:560px;overflow:hidden
}
.settings-card .topbar{border-radius:28px 28px 0 0}
.setting-row{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:16px 20px;border-bottom:1px solid #F2E7D7
}
.setting-row strong{display:block;font-size:16px}
.setting-row small{display:block;color:var(--ink-soft);font-size:12px;margin-top:3px;line-height:1.5}
.setting-row select{
  border:2px solid var(--line);border-radius:12px;padding:10px;background:#FFF9EF;
  font-size:14px;min-height:44px;max-width:52%
}
.switch{position:relative;display:inline-block;width:56px;height:32px;flex:none}
.switch input{opacity:0;width:0;height:0}
.switch span{position:absolute;inset:0;background:#DDD0BC;border-radius:999px;transition:.2s}
.switch span::after{content:"";position:absolute;width:26px;height:26px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.2s}
.switch input:checked + span{background:var(--green)}
.switch input:checked + span::after{transform:translateX(24px)}
.setting-actions{display:flex;gap:10px;padding:20px}
.setting-actions .btn{flex:1}
.settings-foot{padding:0 20px 20px;color:#988A79;font-size:12px;line-height:1.6;margin:0}

/* ---------- 字卡弹层 ---------- */
.overlay{
  position:fixed;inset:0;background:rgba(46,42,38,.5);backdrop-filter:blur(3px);
  z-index:30;display:flex;align-items:center;justify-content:center;padding:14px;
  overflow-y:auto
}
.card{
  position:relative;background:var(--paper);border-radius:30px;box-shadow:0 20px 60px rgba(46,42,38,.3);
  width:100%;max-width:880px;max-height:94dvh;overflow-y:auto;padding:26px
}
.close-btn{
  position:absolute;right:14px;top:12px;width:48px;height:48px;border:none;
  border-radius:50%;background:#F6EBDC;font-size:30px;line-height:1;color:var(--ink-soft);z-index:2
}
.card-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:26px;align-items:start}
.tianzige-wrap{display:flex;flex-direction:column;align-items:center;gap:10px}
.tianzige{
  position:relative;width:100%;max-width:330px;aspect-ratio:1/1;background:#FFFDF8;
  border:5px solid #E7B98A;border-radius:16px;box-shadow:inset 0 0 0 2px #fff
}
.tianzige::before{content:"";position:absolute;left:50%;top:0;bottom:0;border-left:2px dashed #F0CFA8;transform:translateX(-50%)}
.tianzige::after{content:"";position:absolute;top:50%;left:0;right:0;border-top:2px dashed #F0CFA8;transform:translateY(-50%)}
.big-char{
  position:absolute;inset:0;display:grid;place-items:center;
  font-family:var(--kai);font-size:clamp(120px,22vw,230px);line-height:1;color:var(--ink);z-index:1
}
.card-emoji{font-size:44px}
.pinyin{font-size:30px;font-weight:700;letter-spacing:3px;color:var(--orange);margin-bottom:6px}
.en-row{display:flex;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.en-word{font-size:26px;font-weight:800;color:var(--green)}
.en-tag{font-size:11px;background:#E4F5F0;color:#2C8874;border-radius:8px;padding:4px 8px;letter-spacing:1px}
.hint{font-size:20px;line-height:1.6;margin:8px 0 10px;font-weight:600}
.sentence{font-size:17px;background:#FFF6E7;border-left:5px solid var(--orange);border-radius:0 12px 12px 0;padding:10px 14px;margin:0 0 10px;line-height:1.6}
.story{font-size:14px;color:var(--ink-soft);line-height:1.7;margin:0 0 16px}
.story.is-ai{background:#F0EDFF;border-radius:12px;padding:10px 12px;color:#5B4D8F}
.story.is-ai::before{content:"AI 生成 · 家长请先看一眼　";font-size:11px;color:#8A76C9;display:block;letter-spacing:1px}
.card-actions{display:flex;flex-wrap:wrap;gap:10px}
.card-actions .btn{flex:1 1 42%;min-width:130px}

/* ---------- 面板：笔顺 / 测验 ---------- */
.panel{margin-top:22px;border-top:2px dashed var(--line);padding-top:18px}
.panel-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;padding-right:56px}
.panel-head strong{font-size:18px}
.writer-target{
  position:relative;width:min(300px,78vw);aspect-ratio:1/1;margin:0 auto;
  background:#FFFDF8;border:4px solid #E7B98A;border-radius:12px
}
.writer-target::before{content:"";position:absolute;left:50%;top:0;bottom:0;border-left:2px dashed #F0CFA8;transform:translateX(-50%)}
.writer-target::after{content:"";position:absolute;top:50%;left:0;right:0;border-top:2px dashed #F0CFA8;transform:translateY(-50%)}
.panel-actions{display:flex;gap:10px;justify-content:center;margin-top:14px;flex-wrap:wrap}
.fallback{background:#FFF6E7;border-radius:12px;padding:12px;font-size:14px;color:#8A6A45;text-align:center;line-height:1.6}

.quiz-question{text-align:center}
.quiz-emoji{font-size:64px;line-height:1.2}
.quiz-question p#quizText{font-size:24px;font-weight:800;margin:4px 0 2px}
.quiz-en{color:var(--green);font-size:15px;margin:0 0 6px;font-weight:700}
.quiz-options{display:flex;justify-content:center;gap:20px;margin-top:16px;flex-wrap:wrap}
.quiz-opt{
  width:min(160px,38vw);aspect-ratio:1/1;background:var(--paper);border:4px solid var(--line);
  border-radius:24px;font-family:var(--kai);font-size:clamp(70px,15vw,110px);
  box-shadow:var(--shadow);transition:transform .15s ease
}
.quiz-opt:active{transform:scale(.94)}
.quiz-opt.right{border-color:var(--green);background:#EAF8F3;animation:pop .4s ease}
.quiz-opt.wrong{border-color:var(--pink);animation:shake .35s ease}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-8px)}75%{transform:translateX(8px)}}
.quiz-feedback{text-align:center;font-size:19px;font-weight:700;min-height:28px;margin:14px 0 0;color:var(--green)}

/* ---------- 反馈 ---------- */
.toast{
  position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);
  background:var(--ink);color:#fff;padding:12px 22px;border-radius:999px;
  font-size:15px;opacity:0;pointer-events:none;transition:.25s;z-index:60;max-width:88vw;text-align:center
}
.toast.show{opacity:1;transform:translate(-50%,0)}
.celebrate{position:fixed;inset:0;z-index:70;display:grid;place-items:center;background:rgba(255,248,236,.55);pointer-events:none}
.celebrate-inner{font-size:110px;text-align:center;animation:pop .5s ease;color:var(--star)}
.celebrate-inner span{font-size:34px;font-weight:800;color:var(--orange);font-family:var(--ui)}

/* ---------- 响应式 ---------- */
@media (min-width:720px){
  .blocks{grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;max-width:900px}
  .group-chip{font-size:15px;padding:10px 18px}
}
@media (max-width:640px){
  .card{padding:20px 16px;border-radius:24px}
  .card-grid{grid-template-columns:1fr;gap:14px}
  .tianzige-wrap{flex-direction:row;justify-content:center;gap:16px}
  .tianzige{max-width:190px}
  .card-emoji{font-size:38px}
  .tianzige-wrap{order:1}
  .card-info{order:2}
  .pinyin{font-size:26px}
  .hint{font-size:18px}
  .card-actions .btn{flex:1 1 45%;min-width:0;font-size:15px;padding:10px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
}

/* ---------- 小屏防溢出 ----------
   flex / grid item 默认 min-width:auto，内容较宽时会把弹层撑出视口，
   这里统一放开收缩；同时给按钮一个明确的 50% 基准，320px 小屏也不挤。 */
.card{min-width:0;max-width:min(880px,calc(100vw - 28px))}
.card-grid > *,.card-info,.card-actions,.tianzige-wrap{min-width:0}
/* 上半张字卡收起后，面板顶部不再留一条悬空的分隔虚线 */
.card-grid.hidden ~ .panel{margin-top:0;border-top:none;padding-top:0}
@media (max-width:640px){
  .card-actions .btn{flex:1 1 calc(50% - 5px);min-width:0;word-break:break-word}
}