/* KET 学习乐园 · 低龄友好样式 */
:root{
  --c1:#5B7CFA; --c1d:#3F5FE0;
  --c2:#FF8A4C; --c3:#34C77B; --c4:#FFC53D; --c5:#B07BFF;
  --ink:#26303F; --ink2:#5B6879; --line:#E8EDF6;
  --bg:#F3F6FF; --card:#FFFFFF;
  --ok:#1FA95C; --bad:#E4483C;
  --r:22px; --r-s:14px;
  --sh:0 6px 20px rgba(40,60,120,.08);
  --sh-h:0 10px 28px rgba(40,60,120,.16);
  --fs:17px;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{margin:0;padding:0}
body{
  font-family:"Nunito","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:var(--fs); line-height:1.62; color:var(--ink);
  background:
    radial-gradient(1100px 420px at 12% -8%, #DCE6FF 0%, rgba(220,230,255,0) 60%),
    radial-gradient(900px 380px at 95% 0%, #FFE7D2 0%, rgba(255,231,210,0) 55%),
    var(--bg);
  -webkit-tap-highlight-color:transparent;
}
#app{max-width:1080px;margin:0 auto;padding:0 16px 96px;display:flex;flex-direction:column;min-height:100vh}
.i{width:1.2em;height:1.2em;fill:currentColor;flex:none}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}

/* ---------- top bar ---------- */
.topbar{display:flex;align-items:center;gap:14px;padding:14px 2px 10px;position:sticky;top:0;z-index:30;
  background:linear-gradient(180deg,var(--bg) 72%,rgba(243,246,255,0));}
.brand{display:flex;align-items:center;gap:10px;font-size:16px}
.brand-mark{width:42px;height:42px;border-radius:14px;background:linear-gradient(145deg,var(--c1),var(--c5));color:#fff;
  display:grid;place-items:center;font-weight:900;font-size:22px;box-shadow:var(--sh)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text b{font-size:19px;letter-spacing:.5px}
.brand-text small{color:var(--ink2);font-size:12px}
.topnav{margin-left:auto;display:flex;gap:6px}
.topnav a{padding:9px 16px;border-radius:999px;font-weight:700;color:var(--ink2)}
.topnav a.on{background:var(--c1);color:#fff;box-shadow:var(--sh)}
.streak{display:flex;align-items:center;gap:5px;background:#FFF3E0;color:#E07B1F;font-weight:800;
  padding:8px 13px;border-radius:999px;font-size:15px}
.streak .i{width:18px;height:18px}

/* ---------- layout ---------- */
.view{flex:1;padding-top:6px}
.tabbar{display:none}
.grid{display:grid;gap:14px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.sp{flex:1}
h1.page{font-size:26px;margin:6px 0 2px}
h2.sec{font-size:20px;margin:26px 0 12px;display:flex;align-items:center;gap:8px}
.hint{color:var(--ink2);font-size:15px;margin:0 0 14px}
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--sh);padding:18px}
.center{text-align:center}

/* ---------- hero / big tiles ---------- */
.hero{background:linear-gradient(135deg,#5B7CFA 0%,#8E6BFF 55%,#FF8A4C 130%);color:#fff;border-radius:26px;
  padding:22px;box-shadow:0 14px 30px rgba(91,124,250,.32);position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;right:-40px;top:-40px;width:180px;height:180px;border-radius:50%;background:rgba(255,255,255,.14)}
.hero h1{margin:0 0 4px;font-size:27px}
.hero p{margin:0 0 16px;opacity:.94;font-size:16px}
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:14px}
.tile{background:var(--card);border-radius:var(--r);box-shadow:var(--sh);padding:18px;display:flex;gap:14px;align-items:center;
  transition:transform .15s ease, box-shadow .15s ease;border:2px solid transparent}
.tile:hover{transform:translateY(-3px);box-shadow:var(--sh-h)}
.tile .emoji{width:56px;height:56px;border-radius:18px;display:grid;place-items:center;font-size:26px;font-weight:900;color:#fff;flex:none}
.tile b{display:block;font-size:19px}
.tile span{color:var(--ink2);font-size:14px}
.tile.w .emoji{background:linear-gradient(140deg,var(--c1),#7FA6FF)}
.tile.r .emoji{background:linear-gradient(140deg,var(--c2),#FFB067)}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 22px;border-radius:16px;
  font-weight:800;font-size:17px;background:var(--c1);color:#fff;box-shadow:0 6px 0 var(--c1d);transition:transform .1s, box-shadow .1s}
.btn:active{transform:translateY(4px);box-shadow:0 2px 0 var(--c1d)}
.btn.ghost{background:#fff;color:var(--c1);box-shadow:0 6px 0 #DDE5F5;border:2px solid #E3EAFB}
.btn.green{background:var(--c3);box-shadow:0 6px 0 #23A25E}
.btn.orange{background:var(--c2);box-shadow:0 6px 0 #E06A2B}
.btn.yellow{background:var(--c4);color:#6B4B00;box-shadow:0 6px 0 #E0A800}
.btn.red{background:var(--bad);box-shadow:0 6px 0 #B93528}
.btn.sm{padding:9px 15px;font-size:15px;border-radius:13px;box-shadow:0 4px 0 rgba(0,0,0,.14)}
.btn.block{width:100%}
.btn[disabled]{opacity:.45;pointer-events:none}
.icon-btn{width:40px;height:40px;border-radius:12px;background:#EEF2FB;color:var(--ink2);display:grid;place-items:center;font-size:18px}

/* ---------- chips / progress ---------- */
.chips{display:flex;gap:9px;flex-wrap:wrap}
.chip{padding:8px 15px;border-radius:999px;background:#fff;border:2px solid var(--line);font-weight:700;font-size:15px;color:var(--ink2)}
.chip.on{background:var(--c1);border-color:var(--c1);color:#fff}
.bar{height:12px;border-radius:99px;background:#E4EAF7;overflow:hidden}
.bar>i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--c3),#7ED9A6);transition:width .3s}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.stat{background:#fff;border-radius:18px;padding:14px;text-align:center;box-shadow:var(--sh)}
.stat b{display:block;font-size:24px;color:var(--c1)}
.stat span{font-size:13px;color:var(--ink2)}

/* ---------- word card ---------- */
.studywrap{max-width:620px;margin:0 auto}
.wcard{background:#fff;border-radius:28px;box-shadow:var(--sh);padding:26px 22px;text-align:center;position:relative;min-height:340px}
.wcard .idx{position:absolute;left:20px;top:18px;color:var(--ink2);font-size:14px;font-weight:700}
.wcard .topic{position:absolute;right:20px;top:18px;font-size:13px;background:#EEF2FB;color:var(--c1);padding:4px 10px;border-radius:99px;font-weight:700}
.wword{font-size:44px;font-weight:900;letter-spacing:.5px;margin:26px 0 6px;word-break:break-word}
.wphon{font-size:20px;color:var(--ink2);margin-bottom:6px}
.wpos{display:inline-block;background:#F1EBFF;color:#7A4FD6;border-radius:10px;padding:2px 10px;font-size:14px;font-weight:800}
.wcn{font-size:26px;font-weight:800;margin:14px 0 8px;color:var(--c1d)}
.wex{font-size:17px;color:var(--ink);background:#F7F9FF;border-radius:14px;padding:12px;margin-top:12px;line-height:1.55}
.wex em{font-style:normal;font-weight:900;color:var(--c2)}
.wex small{display:block;color:var(--ink2);font-size:14px;margin-top:3px}
.reveal{margin-top:16px}
.speak{position:absolute;right:18px;bottom:18px;width:48px;height:48px;border-radius:50%;background:var(--c1);color:#fff;display:grid;place-items:center;box-shadow:var(--sh)}
.speak:active{transform:scale(.94)}

/* ---------- quiz options ---------- */
.opts{display:grid;gap:11px;margin-top:14px}
.opt{background:#fff;border:2px solid var(--line);border-radius:16px;padding:14px 16px;font-size:18px;text-align:left;
  display:flex;gap:11px;align-items:flex-start;transition:all .12s}
.opt:hover{border-color:#C7D3F5}
.opt .key{width:30px;height:30px;border-radius:9px;background:#EEF2FB;color:var(--c1);font-weight:900;display:grid;place-items:center;flex:none;font-size:16px}
.opt.right{border-color:var(--c3);background:#EDFBF2}
.opt.right .key{background:var(--c3);color:#fff}
.opt.wrong{border-color:var(--bad);background:#FDEEEC}
.opt.wrong .key{background:var(--bad);color:#fff}
.opt.dis{pointer-events:none;opacity:.75}

/* ---------- reading ---------- */
.partcard{display:flex;gap:14px;align-items:center;cursor:pointer}
.partcard .num{width:58px;height:58px;border-radius:18px;color:#fff;display:grid;place-items:center;font-weight:900;font-size:15px;text-align:center;line-height:1.1;flex:none}
.p1 .num{background:linear-gradient(140deg,#5B7CFA,#8AA8FF)}
.p2 .num{background:linear-gradient(140deg,#34C77B,#7ED9A6)}
.p3 .num{background:linear-gradient(140deg,#FF8A4C,#FFBB7D)}
.p4 .num{background:linear-gradient(140deg,#B07BFF,#CFAAFF)}
.p5 .num{background:linear-gradient(140deg,#F5578C,#FF9BBB)}
.p6 .num{background:linear-gradient(140deg,#12B5C9,#6BE0EC)}
.tin{flex:1;min-width:150px;font:inherit;font-size:18px;padding:11px 14px;border:2px solid var(--line);border-radius:14px;background:#fff;color:var(--ink)}
.tin:focus{outline:none;border-color:var(--c1);box-shadow:0 0 0 4px #5B7CFA22}
.passage{background:#fff;border-radius:var(--r);box-shadow:var(--sh);padding:20px 22px;font-size:18px;line-height:1.85}
.passage h3{margin:0 0 10px;font-size:20px}
.passage .gap{display:inline-block;min-width:52px;border-bottom:2px solid var(--c1);text-align:center;font-weight:900;color:var(--c1);margin:0 3px}
.qblock{background:#fff;border-radius:var(--r);box-shadow:var(--sh);padding:16px 18px;margin-top:14px}
.qblock .qhead{display:flex;gap:10px;align-items:flex-start;font-size:18px;font-weight:700}
.qblock .qno{background:var(--c1);color:#fff;border-radius:10px;padding:2px 10px;font-size:15px;font-weight:900;flex:none}
.fb{margin-top:12px;border-radius:16px;padding:14px 16px;font-size:16px;line-height:1.7}
.fb.point{background:#FFF8E6;border-left:6px solid var(--c4)}
.fb.expl{background:#F0F5FF;border-left:6px solid var(--c1)}
.fb b{display:block;margin-bottom:4px;font-size:15px;color:var(--ink2)}
.qtools{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap;align-items:center}
.tag{font-size:13px;font-weight:800;padding:3px 10px;border-radius:99px;background:#EEF2FB;color:var(--c1)}
.tag.old{background:#FFECEC;color:#C0392B}
.matchgrid{display:grid;gap:12px}
.person{background:#F7F9FF;border:2px dashed #C9D6F5;border-radius:16px;padding:12px 16px;font-size:17px}
.slot{background:#fff;border-radius:16px;padding:14px;box-shadow:var(--sh)}
.slot b{color:var(--c1d)}
.pill{display:inline-grid;place-items:center;min-width:34px;height:34px;padding:0 8px;border-radius:11px;background:#EEF2FB;font-weight:900;color:var(--c1);border:2px solid transparent}
.pill.pick{background:var(--c1);color:#fff}
.pill.right{background:var(--c3);color:#fff}
.pill.wrong{background:var(--bad);color:#fff}

/* ---------- list of sets ---------- */
.setlist{display:grid;gap:11px}
.setrow{background:#fff;border-radius:18px;box-shadow:var(--sh);padding:14px 16px;display:flex;gap:12px;align-items:center;cursor:pointer}
.setrow:hover{transform:translateY(-2px)}
.setrow .t{font-weight:800;font-size:17px}
.setrow .s{color:var(--ink2);font-size:14px}
.done-badge{background:#E7F8EE;color:#1FA95C;font-weight:800;font-size:13px;padding:3px 10px;border-radius:99px}

/* ---------- empty / loading ---------- */
.empty{text-align:center;padding:60px 20px;color:var(--ink2)}
.spin{width:44px;height:44px;border-radius:50%;border:5px solid #DDE5F5;border-top-color:var(--c1);margin:0 auto 14px;animation:sp 1s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
@keyframes pop{0%{transform:scale(.9);opacity:0}100%{transform:scale(1);opacity:1}}
.pop{animation:pop .22s ease}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-7px)}75%{transform:translateX(7px)}}
.shake{animation:shake .3s}

/* ---------- toast / modal ---------- */
.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%);background:#26303F;color:#fff;padding:12px 22px;border-radius:16px;
  font-weight:800;z-index:80;box-shadow:var(--sh-h);animation:pop .2s}
.modal{position:fixed;inset:0;background:rgba(20,30,55,.45);display:grid;place-items:center;z-index:90;padding:18px}
.modal-box{background:#fff;border-radius:24px;max-width:640px;width:100%;max-height:84vh;overflow:auto;box-shadow:var(--sh-h)}
.modal-head{display:flex;align-items:center;gap:10px;padding:16px 18px;border-bottom:1px solid var(--line);position:sticky;top:0;background:#fff}
.modal-head b{font-size:19px;flex:1}
.modal-body{padding:18px}

/* ---------- responsive ---------- */
@media (max-width:820px){
  .g4{grid-template-columns:repeat(2,1fr)}
  .g3{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:680px){
  :root{--fs:16px}
  .topnav{display:none}
  /* 微信顶部导航栏占用约 44-50px，压缩顶部间距 */
  #app{padding-bottom:84px;padding-top:0}
  .topbar{padding:6px 2px 6px;top:0}
  .brand-mark{width:36px;height:36px;border-radius:12px;font-size:19px}
  .brand-text b{font-size:17px}
  .brand-text small{font-size:11px}
  h1.page{font-size:22px;margin:2px 0 4px}
  h2.sec{font-size:18px;margin:18px 0 8px}
  .hint{font-size:14px;margin:0 0 10px}
  .card{padding:14px;border-radius:18px}
  .hero{padding:14px;border-radius:18px}
  .hero h1{font-size:21px;margin:0 0 2px}
  .hero p{font-size:14px;margin:0 0 10px}
  .tile{padding:14px;gap:10px}
  .tile .emoji{width:48px;height:48px;font-size:22px}
  .tile b{font-size:17px}
  .tabbar{display:grid;grid-template-columns:repeat(4,1fr);position:fixed;bottom:0;left:0;right:0;background:#fff;
    box-shadow:0 -4px 18px rgba(40,60,120,.12);padding:4px 4px calc(4px + env(safe-area-inset-bottom));z-index:40}
  .tabbar a{display:flex;flex-direction:column;align-items:center;gap:2px;font-size:11px;color:var(--ink2);padding:3px 0;border-radius:10px}
  .tabbar a.on{color:var(--c1);background:#EEF2FB;font-weight:800}
  .tabbar .i{width:22px;height:22px}
  .tiles{grid-template-columns:1fr}
  .g2,.g3,.g4{grid-template-columns:1fr}
  .wword{font-size:30px}
  .streak{padding:5px 9px;font-size:13px}
  .btn{padding:11px 18px;font-size:15px;border-radius:14px}
  .btn.sm{padding:7px 13px;font-size:14px}
  .view{padding-top:2px}
  .passage-img img{border-radius:6px}
}

/* 拼写练习 + 阅读点词查词 */
.scells{display:flex;gap:5px;justify-content:center;flex-wrap:wrap;margin:10px 0}
.sc{width:27px;height:36px;display:grid;place-items:center;border-radius:9px;background:#EEF2FB;color:var(--ink2);font-weight:900;font-size:19px;border:2px solid transparent}
.sc.ok{background:#E4F7EA;color:var(--c3);border-color:#9BE0B0}
.sc.no{background:#FDEEEC;color:var(--bad);border-color:#F3B7AE}
.wd{border-bottom:2px dotted var(--c1);cursor:pointer}
.wd:active{background:#EEF2FB}
.wpop .wpw{font-size:28px;font-weight:900;color:var(--c1d)}
.wpop .wpcn{font-size:19px;font-weight:700;line-height:1.5}
.wpop .wpe{margin-top:10px;padding:10px 12px;background:#F7F9FF;border-radius:12px;font-size:16px;line-height:1.55}
.wpop .wpe em{font-style:normal;font-weight:900;color:var(--c5)}