/* ===========================================================
   数学小狐狸 · 设计系统（浅色主题）
   =========================================================== */
:root{
  --ink:#3B3B4F;
  --ink-2:#6C6885;
  --sub:#9693AC;
  --c1:#FF7A59;      /* 珊瑚橙 主色 */
  --c1d:#F2603C;
  --c2:#22B8AE;      /* 湖水青 */
  --c3:#FFB020;      /* 蜜糖黄 */
  --c4:#9B7BF0;      /* 薰衣草紫 */
  --c5:#4B8DF8;      /* 天空蓝 */
  --c6:#4FBF74;      /* 薄荷绿 */
  --pink:#FF8FB1;
  --bg:#FFF8F1;
  --bg2:#FFF1E6;
  --card:#FFFFFF;
  --line:#F0E8DE;
  --line2:#E7E1F3;
  --shadow:0 8px 24px rgba(93,72,60,.10);
  --shadow-lg:0 18px 42px rgba(93,72,60,.16);
  --r-l:26px; --r-m:18px; --r-s:12px;
  --safe: env(safe-area-inset-bottom, 0px);
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,"Segoe UI",Roboto,sans-serif;
  color:var(--ink);
  background:
    radial-gradient(1100px 520px at 8% -8%, #FFE7D3 0%, rgba(255,231,211,0) 62%),
    radial-gradient(900px 480px at 104% 4%, #DDF5F2 0%, rgba(221,245,242,0) 60%),
    radial-gradient(760px 500px at 50% 108%, #EFE7FF 0%, rgba(239,231,255,0) 62%),
    var(--bg);
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
a{text-decoration:none;color:inherit}

#fxCanvas{position:fixed;inset:0;pointer-events:none;z-index:900}

/* ---------------- 顶部栏 ---------------- */
.topbar{position:sticky;top:0;z-index:60}
.topbar-inner{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:10px 14px;
  background:linear-gradient(120deg,#FFB98A 0%,#FF8E72 38%,#FF7A9C 70%,#B08BF5 100%);
  background-size:220% 100%;
  animation:hueflow 18s linear infinite;
  box-shadow:0 6px 20px rgba(255,122,89,.28);
}
@keyframes hueflow{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
.topbar-wave{
  height:14px;margin-top:-1px;
  background:radial-gradient(12px 14px at 12px 0, transparent 12px, var(--bg) 12.5px) repeat-x;
  background-size:24px 14px;
  filter:drop-shadow(0 2px 0 rgba(0,0,0,.03));
}
.brand{display:flex;align-items:center;gap:9px;color:#fff}
.brand-badge{
  width:38px;height:38px;border-radius:14px;display:grid;place-items:center;font-size:22px;
  background:rgba(255,255,255,.28);backdrop-filter:blur(6px);
  box-shadow:inset 0 0 0 2px rgba(255,255,255,.45);
  animation:wiggle 3.6s ease-in-out infinite;
}
@keyframes wiggle{0%,88%,100%{transform:rotate(0) scale(1)}92%{transform:rotate(-11deg) scale(1.08)}96%{transform:rotate(9deg) scale(1.08)}}
.brand-txt{display:flex;flex-direction:column;line-height:1.18}
.brand-txt b{font-size:16px;letter-spacing:.5px}
.brand-txt i{font-size:10.5px;font-style:normal;opacity:.88}
.topbar-right{display:flex;align-items:center;gap:7px}
.chip{
  display:flex;align-items:center;gap:4px;color:#fff;font-weight:800;font-size:13px;
  padding:6px 11px;border-radius:999px;background:rgba(255,255,255,.24);
  box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.4);
}
.chip-coin .coin-ico{display:inline-block;animation:coinspin 3.2s linear infinite}
@keyframes coinspin{0%,70%{transform:rotateY(0)}85%{transform:rotateY(180deg)}100%{transform:rotateY(360deg)}}
.chip.bump{animation:bump .5s cubic-bezier(.3,1.6,.5,1)}
@keyframes bump{0%{transform:scale(1)}40%{transform:scale(1.28)}100%{transform:scale(1)}}
.icon-btn{
  width:34px;height:34px;border-radius:12px;font-size:16px;color:#fff;
  background:rgba(255,255,255,.22);box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.35);
  display:grid;place-items:center;transition:transform .16s,background .16s;
}
.icon-btn:active{transform:scale(.88)}
.icon-btn.off{opacity:.45;filter:grayscale(1)}

/* ---------------- 布局 ---------------- */
.view{max-width:860px;margin:0 auto;padding:10px 14px calc(96px + var(--safe));}
.sec-title{display:flex;align-items:center;gap:8px;margin:20px 4px 12px;font-size:16px;font-weight:900}
.sec-title .dot{width:9px;height:9px;border-radius:50%;background:var(--c1);box-shadow:0 0 0 4px rgba(255,122,89,.18)}
.sec-title small{margin-left:auto;font-size:11.5px;color:var(--sub);font-weight:700}

.card{background:var(--card);border-radius:var(--r-l);box-shadow:var(--shadow);padding:16px;position:relative;overflow:hidden}
.fade-up{opacity:0;transform:translateY(16px);animation:fadeUp .5s cubic-bezier(.2,.9,.3,1) forwards}
@keyframes fadeUp{to{opacity:1;transform:none}}

/* ---------------- 打卡卡片 ---------------- */
.checkin{
  background:linear-gradient(135deg,#FFF6EC 0%,#FFEAF1 52%,#EFEAFF 100%);
  border-radius:var(--r-l);padding:16px;box-shadow:var(--shadow);position:relative;overflow:hidden;
}
.checkin::after{
  content:"";position:absolute;right:-34px;top:-42px;width:150px;height:150px;border-radius:50%;
  background:radial-gradient(circle at 35% 35%,rgba(255,176,32,.36),rgba(255,176,32,0) 66%);
  animation:floaty 6s ease-in-out infinite;
}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(12px)}}
.checkin-head{display:flex;align-items:center;gap:10px;position:relative;z-index:1}
.checkin-head h3{margin:0;font-size:17px}
.checkin-head p{margin:2px 0 0;font-size:11.5px;color:var(--ink-2)}
.btn-checkin{
  margin-left:auto;padding:11px 20px;border-radius:999px;color:#fff;font-weight:900;font-size:14px;
  background:linear-gradient(135deg,#FF9A6B,#FF6F91);
  box-shadow:0 8px 20px rgba(255,111,145,.42);transition:transform .16s;
}
.btn-checkin:active{transform:scale(.94)}
.btn-checkin[disabled]{background:#E3DFEA;color:#9C98AE;box-shadow:none;cursor:default}
.week{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin-top:14px;position:relative;z-index:1}
.day{background:rgba(255,255,255,.72);border-radius:14px;padding:8px 2px;text-align:center;transition:transform .2s}
.day b{display:block;font-size:11px;color:var(--sub)}
.day .mk{margin-top:4px;font-size:16px;line-height:1;filter:grayscale(1);opacity:.35}
.day.on{background:#fff;box-shadow:0 6px 14px rgba(255,122,89,.2);transform:translateY(-3px)}
.day.on .mk{filter:none;opacity:1;animation:pop .45s cubic-bezier(.3,1.7,.5,1)}
.day.today{outline:2.5px dashed var(--c3);outline-offset:-2px}
@keyframes pop{0%{transform:scale(.2) rotate(-30deg)}70%{transform:scale(1.25)}100%{transform:scale(1)}}

/* ---------------- 年级卡 ---------------- */
.grades{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.gcard{
  border-radius:22px;padding:16px 12px 14px;color:#fff;position:relative;overflow:hidden;
  box-shadow:var(--shadow);transition:transform .2s cubic-bezier(.3,1.4,.5,1);
  display:block;text-align:center;
}
.gcard:active{transform:scale(.95)}
.gcard.g3{background:linear-gradient(150deg,#FFA96B,#FF7A59)}
.gcard.g4{background:linear-gradient(150deg,#5ED6CB,#22B8AE)}
.gcard.g5{background:linear-gradient(150deg,#A98CF5,#7B5CE0)}
.gcard.g1{background:linear-gradient(150deg,#FFD166,#FF9F43)}
.gcard.g2{background:linear-gradient(150deg,#5ED6CB,#3FB6A8)}
.gcard.g6{background:linear-gradient(150deg,#FF9DB4,#FF6B8F)}
.gcard .emoji{font-size:30px;display:block;filter:drop-shadow(0 4px 6px rgba(0,0,0,.16))}
.gcard b{display:block;font-size:15px;margin-top:6px}
.gcard i{font-style:normal;font-size:10.5px;opacity:.9}
.gcard .ring{position:absolute;right:-18px;bottom:-24px;width:78px;height:78px;border-radius:50%;background:rgba(255,255,255,.16)}
.gcard .prog{margin-top:9px;height:6px;border-radius:6px;background:rgba(255,255,255,.32);overflow:hidden}
.gcard .prog span{display:block;height:100%;background:#fff;border-radius:6px;transition:width .8s cubic-bezier(.2,.9,.3,1)}

/* ---------------- 章节 / 知识点列表 ---------------- */
.chapter{background:#fff;border-radius:var(--r-m);box-shadow:var(--shadow);margin-bottom:12px;overflow:hidden}
.chapter-h{display:flex;align-items:center;gap:10px;padding:14px 14px;cursor:pointer;user-select:none}
.chapter-h .tag{font-size:10.5px;font-weight:900;color:#fff;padding:3px 8px;border-radius:8px;background:var(--c4)}
.chapter-h .tag.up{background:var(--c1)}
.chapter-h .tag.down{background:var(--c2)}
.chapter-h b{font-size:14.5px;flex:1}
.chapter-h .arrow{transition:transform .3s;color:var(--sub);font-size:12px}
.chapter.open .arrow{transform:rotate(90deg)}
.chapter-b{max-height:0;overflow:hidden;transition:max-height .42s cubic-bezier(.2,.9,.3,1)}
.chapter.open .chapter-b{max-height:900px}
.kp-item{display:flex;align-items:center;gap:10px;padding:12px 14px;border-top:1px solid var(--line);transition:background .18s}
.kp-item:active{background:var(--bg2)}
.kp-item .n{width:26px;height:26px;border-radius:9px;display:grid;place-items:center;font-size:12px;font-weight:900;background:var(--bg2);color:var(--c1d);flex:none}
.kp-item .tx{flex:1;min-width:0}
.kp-item .tx b{display:block;font-size:13.5px;font-weight:800}
.kp-item .tx i{font-style:normal;font-size:11px;color:var(--sub)}
.kp-item .st{font-size:11px;font-weight:800;color:var(--sub);flex:none}
.kp-item.done .n{background:#E5F8EC;color:var(--c6)}
.kp-item.done .st{color:var(--c6)}

/* ---------------- 知识点详情 ---------------- */
.kp-hero{
  border-radius:var(--r-l);padding:18px;color:#fff;position:relative;overflow:hidden;
  background:linear-gradient(140deg,#FF9A6B,#FF6F91 60%,#B08BF5);box-shadow:var(--shadow-lg);
}
.kp-hero .bk{position:absolute;right:-30px;top:-30px;font-size:110px;opacity:.13;transform:rotate(-14deg)}
.kp-hero .crumb{font-size:11px;opacity:.9;font-weight:700}
.kp-hero h2{margin:6px 0 0;font-size:20px;letter-spacing:.5px}
.kp-hero .tags{display:flex;gap:6px;margin-top:10px;flex-wrap:wrap}
.kp-hero .tags span{font-size:10.5px;font-weight:800;padding:4px 9px;border-radius:999px;background:rgba(255,255,255,.26)}

.block{background:#fff;border-radius:var(--r-l);box-shadow:var(--shadow);padding:16px;margin-top:14px}
.block-h{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.block-h .ic{width:30px;height:30px;border-radius:11px;display:grid;place-items:center;font-size:16px;flex:none}
.block-h b{font-size:15px}
.block-h small{margin-left:auto;font-size:11px;color:var(--sub);font-weight:700}
.ic-1{background:#FFEFE7}.ic-2{background:#E3F8F6}.ic-3{background:#F0EAFF}.ic-4{background:#FFF6DF}

.pt-list{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:9px}
.pt-list li{
  display:flex;gap:9px;align-items:flex-start;font-size:13.5px;line-height:1.62;color:var(--ink);
  background:linear-gradient(180deg,#FFFCF8,#FFF7EF);border-radius:14px;padding:10px 12px;
  border-left:4px solid var(--c3);
}
.pt-list li .k{flex:none;width:19px;height:19px;border-radius:7px;background:var(--c3);color:#fff;font-size:11px;font-weight:900;display:grid;place-items:center;margin-top:1px}
.hl{color:var(--c1d);font-weight:900;background:linear-gradient(transparent 62%,#FFE0B2 62%);padding:0 2px;border-radius:2px}

/* 例题 */
.q-text{font-size:14px;line-height:1.75;background:#FFF9F0;border-radius:14px;padding:12px 13px;border:1.5px dashed #FFD9B0}
.figwrap{margin:14px 0 6px;padding:10px;background:linear-gradient(180deg,#FCFBFF,#F6F3FF);border-radius:18px;border:1.5px solid var(--line2);text-align:center;position:relative}
.figwrap .figtip{position:absolute;top:8px;left:12px;font-size:10px;font-weight:900;color:var(--c4);background:#fff;padding:2px 8px;border-radius:999px;box-shadow:0 2px 6px rgba(0,0,0,.06)}
.figsvg{width:100%;max-width:520px;height:auto;display:block;margin:6px auto 0}
.figswap{animation:figIn .45s cubic-bezier(.2,.9,.3,1)}
@keyframes figIn{from{opacity:0;transform:scale(.96) translateY(8px)}to{opacity:1;transform:none}}

.steps{display:flex;flex-direction:column;gap:10px;margin-top:12px}
.step{
  display:flex;gap:10px;padding:11px 12px;border-radius:16px;background:#F7FBFF;border:1.5px solid #E2EFFB;
  opacity:0;transform:translateX(-12px);animation:stepIn .45s cubic-bezier(.2,.9,.3,1) forwards;
}
@keyframes stepIn{to{opacity:1;transform:none}}
.step .sn{flex:none;width:24px;height:24px;border-radius:9px;background:var(--c5);color:#fff;font-weight:900;font-size:12px;display:grid;place-items:center}
.step .sb b{display:block;font-size:13px;margin-bottom:3px;color:var(--c5)}
.step .sb p{margin:0;font-size:13px;line-height:1.68;color:var(--ink-2)}
.step.final{background:#F2FBF5;border-color:#CDEDD9}
.step.final .sn{background:var(--c6)}
.step.final .sb b{color:var(--c6)}
.formula{
  display:inline-block;margin-top:6px;font-size:14px;font-weight:900;color:var(--c1d);
  background:#FFF1E8;border-radius:10px;padding:5px 10px;letter-spacing:.4px;
}
.btn-step{
  width:100%;margin-top:12px;padding:12px;border-radius:16px;font-weight:900;font-size:14px;color:#fff;
  background:linear-gradient(135deg,#5FA8FF,#4B8DF8);box-shadow:0 8px 18px rgba(75,141,248,.3);transition:transform .15s;
}
.btn-step:active{transform:scale(.97)}
.btn-step.ghost{background:#EFF4FA;color:var(--c5);box-shadow:none}

/* 多例题：每个例题一个卡片 */
.example-block{padding:16px 0 4px;border-top:1.6px dashed var(--line2);margin-top:4px}
.example-block:first-of-type{border-top:none;padding-top:2px}
.example-block .ex-no{display:inline-block;font-size:11px;font-weight:900;color:#fff;background:linear-gradient(135deg,#FFB020,#FF8E5A);padding:3px 11px;border-radius:999px;margin-bottom:10px;letter-spacing:.4px;box-shadow:0 4px 10px rgba(255,142,90,.28)}
.example-block .q-text{margin-top:0}

/* 练习 */
.quiz{border-radius:18px;border:1.5px solid var(--line2);padding:13px;margin-top:12px;background:#fff;transition:border-color .3s,background .3s}
.quiz.right{border-color:#B6E7C8;background:#F5FDF8}
.quiz.wrong{border-color:#FFC9C0;background:#FFF7F5;animation:shake .42s}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-8px)}40%{transform:translateX(7px)}60%{transform:translateX(-5px)}80%{transform:translateX(3px)}}
.quiz .qh{display:flex;align-items:center;gap:7px;margin-bottom:9px}
.quiz .qh .no{font-size:10.5px;font-weight:900;color:#fff;background:var(--c4);padding:3px 8px;border-radius:8px}
.quiz .qh .sc{margin-left:auto;font-size:10.5px;font-weight:800;color:var(--c3)}
.quiz .qq{font-size:13.8px;line-height:1.7}
.opts{display:flex;flex-direction:column;gap:8px;margin-top:11px}
.opt{
  display:flex;align-items:center;gap:9px;padding:11px 12px;border-radius:14px;background:#FAF9FD;
  border:1.6px solid transparent;font-size:13.5px;transition:all .18s;text-align:left;width:100%;
}
.opt .lb{flex:none;width:22px;height:22px;border-radius:8px;background:#fff;box-shadow:inset 0 0 0 1.6px var(--line2);font-size:12px;font-weight:900;color:var(--ink-2);display:grid;place-items:center}
.opt:active{transform:scale(.985)}
.opt.sel{border-color:var(--c5);background:#EEF5FF}
.opt.ok{border-color:var(--c6);background:#EBFAF0}
.opt.ok .lb{background:var(--c6);color:#fff;box-shadow:none}
.opt.no{border-color:#FF9C8A;background:#FFF0ED}
.opt.no .lb{background:#FF7A59;color:#fff;box-shadow:none}
.fillrow{display:flex;gap:8px;margin-top:11px}
.fillrow input{
  flex:1;border:1.6px solid var(--line2);border-radius:14px;padding:11px 13px;font-size:15px;font-weight:800;
  color:var(--ink);background:#FAF9FD;outline:none;font-family:inherit;
}
.fillrow input:focus{border-color:var(--c5);background:#fff}
.fillrow button{padding:0 18px;border-radius:14px;background:var(--c5);color:#fff;font-weight:900;font-size:14px}
.explain{
  margin-top:10px;font-size:12.5px;line-height:1.7;color:var(--ink-2);background:#F6F4FF;border-radius:13px;padding:10px 12px;
  border-left:4px solid var(--c4);animation:fadeUp .4s both;
}
.explain b{color:var(--c4)}

.kp-done{
  margin-top:16px;padding:16px;border-radius:var(--r-l);text-align:center;color:#fff;
  background:linear-gradient(135deg,#63D2A4,#2FBF9B);box-shadow:0 12px 26px rgba(47,191,155,.32);
}
.kp-done b{font-size:16px;display:block}
.kp-done p{margin:5px 0 0;font-size:12px;opacity:.92}
.navbtns{display:flex;gap:10px;margin-top:14px}
.navbtns button{flex:1;padding:13px;border-radius:16px;font-weight:900;font-size:13.5px;background:#fff;box-shadow:var(--shadow);color:var(--ink)}
.navbtns button.primary{background:linear-gradient(135deg,#FF9A6B,#FF6F91);color:#fff;box-shadow:0 8px 18px rgba(255,111,145,.35)}
.navbtns button[disabled]{opacity:.42}

/* ---------------- 宠物页 ---------------- */
.pet-stage{
  border-radius:var(--r-l);overflow:hidden;position:relative;box-shadow:var(--shadow-lg);
  min-height:322px;display:grid;place-items:center;
}
#petSvg{width:100%;height:auto;display:block}
.pet-hud{position:absolute;left:12px;top:12px;right:12px;display:flex;gap:8px;align-items:flex-start;z-index:3}
.pet-name{background:rgba(255,255,255,.86);backdrop-filter:blur(6px);border-radius:14px;padding:7px 11px;box-shadow:var(--shadow)}
.pet-name b{font-size:13.5px;display:block}
.pet-name i{font-style:normal;font-size:10.5px;color:var(--sub)}
.hud-bars{margin-left:auto;display:flex;flex-direction:column;gap:5px;align-items:flex-end}
.bar{width:112px;height:15px;border-radius:999px;background:rgba(255,255,255,.8);box-shadow:var(--shadow);overflow:hidden;position:relative}
.bar span{position:absolute;inset:0;width:0;border-radius:999px;transition:width .8s cubic-bezier(.2,.9,.3,1)}
.bar .lv{background:linear-gradient(90deg,#FFC46B,#FF8A5B)}
.bar .in{background:linear-gradient(90deg,#FF9CC0,#FF6F91)}
.bar em{position:absolute;inset:0;display:grid;place-items:center;font-style:normal;font-size:9.5px;font-weight:900;color:#6B5A4E;z-index:2}
.pet-acts{display:flex;gap:9px;margin-top:12px}
.pet-acts button{
  flex:1;padding:12px 6px;border-radius:18px;background:#fff;box-shadow:var(--shadow);font-weight:900;font-size:12.5px;
  display:flex;flex-direction:column;align-items:center;gap:3px;transition:transform .15s;
}
.pet-acts button:active{transform:scale(.94)}
.pet-acts button span{font-size:19px}
.pet-acts button small{font-size:9.5px;color:var(--c3);font-weight:800}
.pet-acts button.on{background:linear-gradient(135deg,#FF9A6B,#FF6F91);color:#fff;box-shadow:0 8px 16px rgba(255,111,145,.34)}
.pet-acts button.on span{filter:drop-shadow(0 1px 1px rgba(0,0,0,.15))}
.pet-acts button.on small{color:rgba(255,255,255,.92)}

.pet-panel{margin-top:10px;overflow:hidden}
.chooser{background:#fff;border-radius:20px;box-shadow:var(--shadow);padding:13px 13px 14px;animation:fadeUp .3s ease both}
.chooser-h{font-weight:900;font-size:13.5px;margin-bottom:10px;color:var(--ink-2)}
.chooser-tip{font-size:12px;color:var(--sub);font-weight:700;padding:4px 2px 6px;line-height:1.5}
.chips{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.chip{
  background:linear-gradient(135deg,#FFF6EF,#FFE9DC);border:2px solid transparent;border-radius:16px;
  padding:10px 4px 8px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:2px;
  font-weight:900;transition:transform .15s,box-shadow .2s;box-shadow:0 4px 10px rgba(255,140,100,.12);
}
.chip:active{transform:scale(.93)}
.chip span{font-size:26px;line-height:1;filter:drop-shadow(0 2px 3px rgba(0,0,0,.12))}
.chip b{font-size:11.5px;color:var(--ink-2);margin-top:2px}
.chip small{font-size:9.5px;color:var(--c3);font-weight:800}
.chip.ghost{background:#fff;border-style:dashed;border-color:#EAD9CC;box-shadow:none;margin-top:10px;color:var(--sub);font-size:11.5px;padding:9px}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

.shop-tabs{display:flex;gap:7px;margin:16px 0 12px;overflow-x:auto;padding-bottom:3px;scrollbar-width:none}
.shop-tabs::-webkit-scrollbar{display:none}
.shop-tabs button{
  flex:none;padding:9px 15px;border-radius:999px;background:#fff;box-shadow:var(--shadow);
  font-size:12.5px;font-weight:800;color:var(--ink-2);transition:all .2s;white-space:nowrap;
}
.shop-tabs button.on{background:linear-gradient(135deg,#FF9A6B,#FF6F91);color:#fff;box-shadow:0 8px 16px rgba(255,111,145,.34)}
.shop-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(104px,1fr));gap:11px}
.shop-item{
  background:#fff;border-radius:20px;box-shadow:var(--shadow);padding:11px 8px 10px;text-align:center;
  position:relative;overflow:hidden;transition:transform .18s cubic-bezier(.3,1.4,.5,1);border:2px solid transparent;
}
.shop-item:active{transform:scale(.94)}
.shop-item.owned{border-color:#CFEBD9}
.shop-item.on{border-color:var(--c1);box-shadow:0 10px 22px rgba(255,122,89,.3)}
.shop-item .pv{height:52px;display:grid;place-items:center;font-size:30px;filter:drop-shadow(0 4px 5px rgba(0,0,0,.1))}
.shop-item b{display:block;font-size:11.5px;margin-top:2px}
.shop-item .price{margin-top:5px;font-size:11px;font-weight:900;color:var(--c3)}
.shop-item .price.got{color:var(--c6)}
.shop-item .flag{position:absolute;top:6px;right:6px;font-size:9.5px;font-weight:900;color:#fff;background:var(--c1);padding:2px 6px;border-radius:8px}
.shop-item.locked .pv{filter:grayscale(1);opacity:.42}

/* ---------------- 成就页 ---------------- */
.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:11px}
.stat{background:#fff;border-radius:20px;box-shadow:var(--shadow);padding:14px;position:relative;overflow:hidden}
.stat .big{font-size:26px;font-weight:900;letter-spacing:-.5px}
.stat .lb{font-size:11.5px;color:var(--sub);font-weight:700;margin-top:2px}
.stat .ico{position:absolute;right:8px;top:8px;font-size:26px;opacity:.18}
.ach{display:flex;align-items:center;gap:11px;background:#fff;border-radius:18px;box-shadow:var(--shadow);padding:12px;margin-bottom:10px}
.ach .em{width:44px;height:44px;border-radius:15px;display:grid;place-items:center;font-size:22px;background:var(--bg2);flex:none}
.ach.got .em{background:linear-gradient(135deg,#FFE1A8,#FFC46B);animation:glow 2.4s ease-in-out infinite}
@keyframes glow{0%,100%{box-shadow:0 0 0 0 rgba(255,176,32,.5)}50%{box-shadow:0 0 0 9px rgba(255,176,32,0)}}
.ach .tx{flex:1}
.ach .tx b{font-size:13.5px;display:block}
.ach .tx i{font-style:normal;font-size:11px;color:var(--sub)}

/* ---------------- 数据备份与恢复 ---------------- */
.backup-card{background:linear-gradient(135deg,#FFF6EC,#F1FBF7);border:1px solid var(--line);border-radius:var(--r-l);box-shadow:var(--shadow);padding:15px;margin-top:4px}
.backup-tip{margin:0 0 12px;font-size:12.5px;line-height:1.65;color:var(--ink-2)}
.backup-tip b{color:var(--c1d);font-weight:800}
.backup-btns{display:flex;gap:10px;flex-wrap:wrap}
.backup-btns button{flex:1;min-width:130px;border:none;border-radius:14px;padding:12px 14px;font-size:14px;font-weight:800;background:#fff;color:var(--ink);box-shadow:var(--shadow);cursor:pointer;transition:transform .12s ease}
.backup-btns button:active{transform:scale(.95)}
.backup-btns button.primary{background:linear-gradient(135deg,#FF9A6B,#FF6F91);color:#fff;box-shadow:0 8px 18px rgba(255,111,145,.32)}
.ach .pg{height:6px;border-radius:6px;background:var(--line);margin-top:6px;overflow:hidden}
.ach .pg span{display:block;height:100%;background:linear-gradient(90deg,#FFC46B,#FF8A5B);border-radius:6px;transition:width .8s}
.ach.locked{opacity:.62}

/* ---------------- 底部导航 ---------------- */
.tabbar{
  position:fixed;left:50%;transform:translateX(-50%);bottom:calc(12px + var(--safe));z-index:70;
  display:flex;gap:2px;background:rgba(255,255,255,.9);backdrop-filter:blur(14px);
  border-radius:999px;padding:6px;box-shadow:0 12px 30px rgba(93,72,60,.2);
  width:min(400px,calc(100% - 28px));
}
.tabbar a{
  flex:1;display:flex;flex-direction:column;align-items:center;gap:1px;padding:7px 0;border-radius:999px;
  color:var(--sub);transition:all .22s;
}
.tabbar a span{font-size:18px;transition:transform .25s cubic-bezier(.3,1.6,.5,1)}
.tabbar a i{font-style:normal;font-size:10px;font-weight:800}
.tabbar a.on{background:linear-gradient(135deg,#FFF0E6,#FFE6EF);color:var(--c1d)}
.tabbar a.on span{transform:translateY(-2px) scale(1.16)}

/* ---------------- Toast / 弹窗 ---------------- */
.toast-host{position:fixed;left:0;right:0;top:70px;z-index:950;display:flex;flex-direction:column;align-items:center;gap:8px;pointer-events:none}
.toast{
  background:rgba(59,59,79,.94);color:#fff;font-size:13px;font-weight:800;padding:10px 18px;border-radius:999px;
  box-shadow:0 10px 26px rgba(0,0,0,.22);animation:toastIn .4s cubic-bezier(.2,1.5,.4,1), toastOut .4s 1.9s forwards;
  display:flex;align-items:center;gap:7px;
}
.toast.good{background:linear-gradient(135deg,#4FBF74,#2FA85F)}
.toast.coin{background:linear-gradient(135deg,#FFB020,#FF8A3D)}
.toast.bad{background:linear-gradient(135deg,#FF8A72,#F2603C)}
@keyframes toastIn{from{opacity:0;transform:translateY(-18px) scale(.86)}to{opacity:1;transform:none}}
@keyframes toastOut{to{opacity:0;transform:translateY(-14px) scale(.94)}}

.modal-mask{position:fixed;inset:0;background:rgba(40,32,48,.42);backdrop-filter:blur(3px);z-index:940;display:grid;place-items:center;padding:22px;animation:fadeIn .25s}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.modal{
  background:#fff;border-radius:28px;padding:22px;width:min(340px,100%);text-align:center;box-shadow:var(--shadow-lg);
  animation:modalIn .48s cubic-bezier(.2,1.4,.4,1);
}
@keyframes modalIn{from{opacity:0;transform:scale(.7) translateY(24px)}to{opacity:1;transform:none}}
.modal .big{font-size:52px;animation:pop .6s cubic-bezier(.3,1.7,.5,1)}
.modal h3{margin:8px 0 4px;font-size:18px}
.modal p{margin:0;font-size:13px;color:var(--ink-2);line-height:1.65}
.modal .rew{display:inline-flex;align-items:center;gap:6px;margin-top:12px;background:#FFF6E2;color:#C77E12;font-weight:900;padding:8px 16px;border-radius:999px;font-size:14px}
.modal button{margin-top:16px;width:100%;padding:13px;border-radius:16px;font-weight:900;font-size:14.5px;color:#fff;background:linear-gradient(135deg,#FF9A6B,#FF6F91);box-shadow:0 8px 18px rgba(255,111,145,.35)}

/* 积分飞出动画 */
.flycoin{position:fixed;z-index:960;font-weight:900;font-size:17px;color:var(--c3);pointer-events:none;text-shadow:0 2px 6px rgba(255,176,32,.4);animation:fly 1.05s cubic-bezier(.3,.2,.2,1) forwards}
@keyframes fly{0%{opacity:0;transform:translateY(0) scale(.6)}18%{opacity:1;transform:translateY(-14px) scale(1.2)}100%{opacity:0;transform:translateY(-84px) scale(.85)}}

.empty{text-align:center;padding:40px 10px;color:var(--sub);font-size:13px}
.empty .e{font-size:44px;display:block;margin-bottom:8px;opacity:.5}

/* JS 控制的显隐 / 锁定态 */
.hidden{display:none!important}
.opt.done{pointer-events:none;opacity:.7}
.opts.locked .opt{pointer-events:none;opacity:.82}
.flycoin{position:fixed;z-index:960;font-weight:900;font-size:17px;color:var(--c3);pointer-events:none;text-shadow:0 2px 6px rgba(255,176,32,.4);animation:fly 1.05s cubic-bezier(.3,.2,.2,1) forwards}
@keyframes fly{0%{opacity:0;transform:translateY(0) scale(.6)}18%{opacity:1;transform:translateY(-14px) scale(1.2)}100%{opacity:0;transform:translateY(-84px) scale(.85)}}
.answer{margin-top:12px}

@media (max-width:360px){
  .grades{grid-template-columns:repeat(3,1fr);gap:8px}
  .gcard{padding:13px 6px}
  .brand-txt i{display:none}
}

/* ==================== 低龄交互增强：点击动画 + 高亮反馈 ==================== */
/* 通用点击脉冲：给主要可交互元素统一的按压反馈 */
.tap-fx{animation:tapFx .26s ease-out}
@keyframes tapFx{
  0%{transform:scale(1);filter:brightness(1)}
  35%{transform:scale(.93);filter:brightness(1.12)}
  100%{transform:scale(1);filter:brightness(1)}
}
/* 选项按钮：点击时高亮波纹 + 缩放 */
.opt{position:relative;overflow:hidden;transition:transform .14s, background .18s, border-color .18s}
.opt:active{transform:scale(.97)}
.opt.tap-fx{animation:optTap .26s ease-out}
@keyframes optTap{0%{transform:scale(1)}40%{transform:scale(.95);box-shadow:0 0 0 4px rgba(75,141,248,.25)}100%{transform:scale(1)}}
.opt.ok{animation:popOk .4s cubic-bezier(.2,1.6,.4,1)}
@keyframes popOk{0%{transform:scale(1)}45%{transform:scale(1.04)}100%{transform:scale(1)}}
.opt.no{animation:shakeX .42s}
@keyframes shakeX{0%,100%{transform:translateX(0)}20%{transform:translateX(-6px)}40%{transform:translateX(6px)}60%{transform:translateX(-4px)}80%{transform:translateX(4px)}}

/* 通用按钮按压反馈 */
button{cursor:pointer}
.btn-step,.btn-checkin,.navbtns button,.pet-acts button,.shop-item,.gcard,.kp-item,.chapter-h,.icon-btn{
  transition:transform .14s cubic-bezier(.3,1.4,.5,1), box-shadow .2s, background .2s;
}
.btn-step:active,.btn-checkin:not([disabled]):active,.navbtns button:active,.pet-acts button:active,.shop-item:active,.gcard:active{
  transform:scale(.94);
}
.kp-item:active{background:var(--bg2);transform:scale(.99)}
.chapter-h:active{background:var(--bg2)}
.icon-btn:active{transform:scale(.86)}

/* 答题反馈色增强（低年级更醒目） */
.quiz.right{border-width:2px}
.quiz.wrong{animation:shake .42s}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-7px)}40%{transform:translateX(7px)}60%{transform:translateX(-4px)}80%{transform:translateX(4px)}}
.fillrow input:focus{box-shadow:0 0 0 4px rgba(75,141,248,.18)}
.fillrow button:active{transform:scale(.92);background:var(--c4)}

/* 打卡 / 通关按钮发光 */
.btn-checkin{box-shadow:0 8px 18px rgba(255,122,89,.32)}
.btn-checkin:not([disabled]):hover{box-shadow:0 10px 22px rgba(255,122,89,.45)}
.kp-done{animation:popOk .5s cubic-bezier(.2,1.6,.4,1)}

/* 学习页卡片整体入场，错落有致 */
.fade-up{animation:fadeUp .5s cubic-bezier(.2,.9,.3,1) both}
.grades .gcard:nth-child(2){animation-delay:.06s}
.grades .gcard:nth-child(3){animation-delay:.12s}
.grades .gcard:nth-child(4){animation-delay:.18s}
.grades .gcard:nth-child(5){animation-delay:.24s}

/* 空状态与错误提示 */
.empty-state{text-align:center;padding:38px 18px;color:var(--sub)}
.empty-state .empty-icon{font-size:44px;margin-bottom:10px;filter:grayscale(.25);opacity:.85}
.empty-state b{display:block;font-size:15px;color:var(--ink-2);margin-bottom:6px}
.empty-state p{font-size:13px;line-height:1.5;margin:0}
.empty-state p:empty{display:none}

/* =========================================================
   六年级粉色主题：按键与背景拉开对比，文字/图标清晰可辨
   （仅作用于带 .g6 作用域类的六年级页面，不影响其他年级）
   ========================================================= */
/* 首页六年级卡片（此前缺 .gcard.g6，透明背景+白字几乎不可见）——
   已在上方“年级卡”区块与 g1~g5 一并定义 */

/* 例题主按钮：蓝色→粉色 */
.g6 .btn-step{background:linear-gradient(135deg,#FF7A9C,#F23A6E);box-shadow:0 8px 18px rgba(242,58,110,.35)}
/* 参考答案按钮（ghost）：浅粉底 + 深粉字，与米色背景形成明确对比 */
.g6 .btn-step.ghost{background:#FFE9F0;color:#C2185B;box-shadow:none;border:1.6px solid #FFB7CB}
/* 填空题“检查”按钮 */
.g6 .fillrow button{background:#F23A6E;color:#fff}
.g6 .fillrow input:focus{border-color:#FF6B8F}
/* 底部导航（返回/下一个） */
.g6 .navbtns button{background:#FFE9F0;color:#C2185B;box-shadow:0 6px 14px rgba(255,107,143,.22);border:1.6px solid #FFB7CB}
.g6 .navbtns button.primary{background:linear-gradient(135deg,#FF7A9C,#F23A6E);color:#fff;border:none;box-shadow:0 8px 18px rgba(242,58,110,.38)}
/* 例题徽标、选择题选中态、章节目录标签点缀 */
.g6 .ex-no{background:linear-gradient(135deg,#FF7A9C,#F23A6E);box-shadow:0 4px 10px rgba(242,58,110,.3)}
.g6 .opt.sel{border-color:#FF6B8F;background:#FFEDF3}
.g6 .quiz .qh .no{background:#FF6B8F}
.g6 .chapter-h .tag.up{background:linear-gradient(135deg,#FF7A9C,#F23A6E)}
.g6 .chapter-h .tag{background:#FF6B8F}