@font-face{font-family:"K1Kai";src:url("fonts/k1kai.woff2") format("woff2");font-display:swap}
:root{
  --paper:#F3F8F4; --ink:#1D4A3A; --muted:#5E7A6E; --grid:#E07A6C; --sun:#F5C443;
  --white:#fff; --line:#CFE0D5; --danger:#B3261E;
  --ui:"Nunito","Noto Sans SC",system-ui,sans-serif;
  --kai:"K1Kai","KaiTi","STKaiti","Kaiti SC","BiauKai","Noto Serif SC",serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--ui);color:var(--ink);background:var(--paper);line-height:1.6;font-size:17px;
  padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}
a{color:var(--ink)}
:focus-visible{outline:3px solid var(--sun);outline-offset:2px}
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 20px;max-width:1080px;margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;font-size:18px}
.mark{width:40px;height:40px;display:grid;place-items:center;font-family:var(--kai);font-size:26px;background:var(--white);
  border:2px solid var(--grid);position:relative;border-radius:4px}
.mark::before,.mark::after{content:"";position:absolute;background:none;border-color:var(--grid);opacity:.45}
.mark::before{left:50%;top:0;bottom:0;border-left:1px dashed var(--grid)}
.mark::after{top:50%;left:0;right:0;border-top:1px dashed var(--grid)}
nav{display:flex;align-items:center;gap:16px;font-weight:700;font-size:15px}
nav a{text-decoration:none}
main{max-width:1080px;margin:0 auto;padding:8px 20px 48px}
.foot{max-width:1080px;margin:0 auto;padding:24px 20px 40px;color:var(--muted);font-size:14px;border-top:1px solid var(--line)}
.foot p{margin:4px 0}
h1{font-size:clamp(30px,5vw,46px);line-height:1.15;margin:0 0 14px;font-weight:800;letter-spacing:-.01em}
h2{font-size:24px;margin:32px 0 12px}
h3{font-size:18px;margin:0 0 6px}
.lede{font-size:19px;color:var(--muted);max-width:34em;margin:0 0 24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:0 24px;border-radius:26px;border:0;
  background:var(--ink);color:var(--white);font:inherit;font-weight:800;font-size:17px;text-decoration:none;cursor:pointer}
.btn.small{min-height:40px;padding:0 16px;font-size:15px}
.btn.ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 2px var(--ink)}
.btn.sun{background:var(--sun);color:var(--ink)}
.btn.danger{background:var(--danger)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.flash{padding:12px 16px;border-radius:12px;margin:8px 0 16px;font-weight:700;background:#E1F2E7}
.flash.err{background:#FBE3E1;color:var(--danger)}

/* Landing */
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;padding:28px 0 20px}
.hero .actions{display:flex;gap:12px;flex-wrap:wrap}
.sample{background:var(--white);border-radius:24px;padding:24px;display:flex;flex-direction:column;align-items:center;gap:16px}
.tzg{width:min(240px,60vw);aspect-ratio:1;border:3px solid var(--grid);position:relative;display:grid;place-items:center;
  font-family:var(--kai);font-size:min(180px,45vw);line-height:1;background:
  linear-gradient(to right,transparent calc(50% - .5px),rgba(224,122,108,.45) calc(50% - .5px),rgba(224,122,108,.45) calc(50% + .5px),transparent calc(50% + .5px)),
  linear-gradient(to bottom,transparent calc(50% - .5px),rgba(224,122,108,.45) calc(50% - .5px),rgba(224,122,108,.45) calc(50% + .5px),transparent calc(50% + .5px)),
  linear-gradient(45deg,transparent calc(50% - .5px),rgba(224,122,108,.2) calc(50% - .5px),rgba(224,122,108,.2) calc(50% + .5px),transparent calc(50% + .5px)),
  linear-gradient(-45deg,transparent calc(50% - .5px),rgba(224,122,108,.2) calc(50% - .5px),rgba(224,122,108,.2) calc(50% + .5px),transparent calc(50% + .5px))}
.say{display:flex;align-items:center;gap:10px}
.speaker{width:56px;height:56px;border-radius:50%;border:0;background:var(--sun);font-size:26px;cursor:pointer}
.teacher-line{font-size:18px;font-weight:700;min-height:1.6em;text-align:center}
.choices{display:flex;gap:14px}
.choice{width:120px;height:120px;border-radius:20px;border:3px solid var(--line);background:var(--white);cursor:pointer;display:grid;place-items:center;padding:8px}
.choice svg{width:88px;height:88px}
.choice.right{border-color:var(--ink);background:#E1F2E7}
.choice.soft{opacity:.45}
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin:36px 0}
.features p{margin:0;color:var(--muted)}
.units{background:var(--white);border-radius:20px;padding:8px 24px;margin:12px 0 32px}
.units li{padding:10px 0;border-bottom:1px solid var(--line);list-style:none;display:flex;gap:14px;align-items:baseline}
.units li:last-child{border-bottom:0}
.units ul{padding:0;margin:0}
.units .u{font-weight:800;min-width:64px}
.units .zh{font-family:var(--kai);font-size:21px}

/* Forms */
.panel{background:var(--white);border-radius:20px;padding:28px;max-width:460px;margin:12px auto}
.panel.wide{max-width:760px}
label{display:block;font-weight:700;margin:14px 0 6px}
input[type=text],input[type=email],input[type=password],input[type=tel],input[type=number],select,textarea{
  width:100%;min-height:50px;padding:10px 14px;border-radius:12px;border:2px solid var(--line);font:inherit;background:var(--white);color:var(--ink)}
input:focus,select:focus{border-color:var(--ink);outline:none}
.check{display:flex;gap:10px;align-items:flex-start;font-weight:500;font-size:15px}
.check input{width:22px;height:22px;margin-top:3px;flex:none}
.hint{font-size:14px;color:var(--muted);margin:4px 0 0}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.stack>*+*{margin-top:12px}
.err-text{color:var(--danger);font-weight:700}

/* Account */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.card{background:var(--white);border-radius:20px;padding:22px}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:13px;color:var(--muted)}
.tag{display:inline-block;padding:2px 10px;border-radius:10px;font-size:13px;font-weight:800;background:#E1F2E7}
.tag.off{background:#EEE;color:var(--muted)}
.tag.wait{background:#FFF1C9}
.tag.no{background:#FBE3E1;color:var(--danger)}
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:16px 0}
.plan{background:var(--white);border-radius:20px;padding:22px;border:3px solid transparent;display:flex;flex-direction:column;gap:6px}
.plan .price{font-size:34px;font-weight:800}
.plan .price small{font-size:15px;color:var(--muted);font-weight:700}
.plan.both{border-color:var(--sun)}
.pay-ref{font-size:28px;font-weight:800;letter-spacing:.04em;background:#FFF1C9;border-radius:12px;padding:8px 16px;display:inline-block}
.qr{max-width:220px;border-radius:12px;border:1px solid var(--line)}

/* Who is learning today */
.who h1{text-align:center}
.kids{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;margin:28px 0}
.kid{width:180px;min-height:200px;border-radius:28px;background:var(--white);border:4px solid var(--line);display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:10px;font:inherit;cursor:pointer;color:var(--ink)}
.kid .av{font-size:72px;line-height:1}
.kid .nm{font-size:26px;font-weight:800}
.kid:active{transform:scale(.97)}
.avatars{display:flex;flex-wrap:wrap;gap:8px}
.avatars label{margin:0;font-size:34px;cursor:pointer}
.avatars input{position:absolute;opacity:0}
.avatars span{display:grid;place-items:center;width:58px;height:58px;border-radius:14px;border:3px solid var(--line)}
.avatars input:checked+span{border-color:var(--ink);background:#E1F2E7}
.pin input{font-size:32px;text-align:center;letter-spacing:.4em;max-width:220px;margin:0 auto;display:block}

@media (max-width:760px){
  .hero,.features,.grid2,.plans{grid-template-columns:1fr}
  .hero{gap:24px}
  nav{gap:10px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
[hidden]{display:none!important}

/* Theme B for public and parent pages: same sky + chunky buttons, kept calm and readable */
:root{--ink:#16486B;--sun:#FFD84D;--paper:#EAF6FF;--line:#CFE3F3}
body:not(.child){background:linear-gradient(180deg,#C9ECFF 0%,#EAF6FF 35%,#F2FBF4 100%) fixed}
.btn{box-shadow:inset 0 4px 0 rgba(255,255,255,.25),inset 0 -6px 0 rgba(0,0,0,.2),0 6px 0 rgba(0,0,0,.1);transition:transform .12s}
.btn:active{transform:translateY(4px)}
.btn.ghost{background:#fff;box-shadow:inset 0 -5px 0 var(--line),0 5px 0 rgba(0,0,0,.06)}
.btn.sun{box-shadow:inset 0 -6px 0 #E8B400,0 6px 0 rgba(0,0,0,.1)}
.btn.danger{box-shadow:inset 0 -6px 0 #7E1B15,0 6px 0 rgba(0,0,0,.1)}
.panel,.card,.sample,.units,.plan{box-shadow:inset 0 -6px 0 var(--line),0 8px 0 rgba(22,72,107,.06)}
.kid{border:0;box-shadow:inset 0 6px 0 rgba(255,255,255,.8),inset 0 -10px 0 var(--line),0 10px 0 rgba(22,72,107,.12)}
.kid:nth-child(4n+2){background:#FFE0DC}.kid:nth-child(4n+3){background:#D4F3E8}.kid:nth-child(4n+4){background:#FFEBC7}.kid:nth-child(4n+5){background:#D9ECFD}
.choice{border:0;box-shadow:inset 0 -6px 0 var(--line),0 6px 0 rgba(0,0,0,.08)}
.speaker{box-shadow:inset 0 -5px 0 #E8B400,0 5px 0 rgba(0,0,0,.1)}