.nav-actions{
  display:flex;
  align-items:center;
  gap:12px;
}

.language-toggle{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:42px;
  padding:5px 12px 5px 6px;
  border:1px solid rgba(16,38,63,.13);
  border-radius:999px;
  background:rgba(255,255,255,.82);
  color:var(--ink);
  font:inherit;
  font-size:13px;
  font-weight:850;
  box-shadow:0 5px 18px rgba(21,46,66,.07);
  cursor:pointer;
  -webkit-tap-highlight-color:transparent;
  transition:transform 180ms cubic-bezier(.22,1,.36,1),box-shadow 180ms ease,border-color 180ms ease,background-color 180ms ease;
}

.language-toggle:hover{
  transform:translateY(-1px);
  border-color:rgba(49,95,85,.28);
  box-shadow:0 9px 22px rgba(21,46,66,.11);
}

.language-toggle:active{transform:translateY(1px) scale(.975)}
.language-toggle:focus-visible{outline:4px solid rgba(72,121,185,.2);outline-offset:2px}

.language-toggle-icon{
  display:grid;
  place-items:center;
  width:30px;
  height:30px;
  border-radius:50%;
  background:var(--ink);
  color:#fff;
  font-size:13px;
  line-height:1;
  transition:transform 360ms cubic-bezier(.22,1,.36,1),background-color 220ms ease;
}

html[lang="zh-CN"] body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",Inter,ui-rounded,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}

html[lang="zh-CN"] .language-toggle-icon{
  transform:rotateY(180deg);
  background:var(--green-deep);
}

html[lang="zh-CN"] .hero-panel::before{content:"概念演示"}

html[lang="zh-CN"] .eyebrow,
html[lang="zh-CN"] .status,
html[lang="zh-CN"] .tag{
  letter-spacing:.09em;
}

.age-band-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:16px;
  margin-bottom:18px;
}

.age-band{
  min-height:250px;
  padding:27px;
  border:1px solid var(--line);
  border-radius:26px;
  background:#fff;
  box-shadow:var(--small-shadow);
}

.age-band>span{
  display:inline-grid;
  place-items:center;
  min-width:68px;
  height:42px;
  padding:0 13px;
  border-radius:14px;
  background:var(--blue-soft);
  color:var(--blue);
  font-size:19px;
  font-weight:950;
}

.age-band.middle>span{background:var(--green-soft);color:var(--green-deep)}
.age-band.teen>span{background:var(--apricot-soft);color:#9a592d}
.age-band h3{margin:42px 0 9px;font-size:23px;letter-spacing:-.025em}
.age-band p{margin:0;color:var(--muted)}

.validation-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
}

.validation-card{
  display:grid;
  grid-template-columns:42px 1fr;
  gap:17px;
  padding:22px;
  border:1px solid var(--line);
  border-radius:21px;
  background:rgba(255,255,255,.77);
}

.validation-card>span{
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  border-radius:14px;
  background:var(--ink);
  color:#fff;
  font-size:11px;
  font-weight:900;
  letter-spacing:.08em;
}

.validation-card h3{margin:2px 0 7px;font-size:18px}
.validation-card p{margin:0;color:var(--muted);font-size:14px}

.priority-note{
  display:flex;
  align-items:flex-start;
  gap:14px;
  margin-top:18px;
  padding:19px 21px;
  border-radius:20px;
  background:var(--ink);
  color:#fff;
}

.priority-note strong{white-space:nowrap;color:#f2c38f}
.priority-note span{color:#d7e0e7}

.payment-layout{
  display:grid;
  grid-template-columns:1.35fr .65fr;
  gap:16px;
  align-items:stretch;
}

.payment-panel{
  padding:27px;
  border:1px solid var(--line);
  border-radius:26px;
  background:#fff;
  box-shadow:var(--small-shadow);
}

.payment-panel.recommended{background:linear-gradient(145deg,#fff,#edf4ef)}
.payment-panel.avoid{background:linear-gradient(145deg,#fff,#fff0e5)}
.payment-panel-head{display:flex;align-items:center;gap:15px;margin-bottom:20px}
.payment-panel-head>span{display:grid;place-items:center;width:46px;height:46px;border-radius:15px;background:var(--green-deep);color:#fff;font-size:22px;font-weight:950}
.payment-panel.avoid .payment-panel-head>span{background:#a95e2d}
.payment-panel-head h3{margin:2px 0 0;font-size:24px;letter-spacing:-.03em}

.payment-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.payment-list article{display:grid;grid-template-columns:32px 1fr;gap:12px;padding:17px;border:1px solid rgba(16,38,63,.1);border-radius:18px;background:rgba(255,255,255,.76)}
.payment-list article>b{display:grid;place-items:center;width:32px;height:32px;border-radius:11px;background:var(--ink);color:#fff;font-size:10px;letter-spacing:.08em}
.payment-list h4{margin:2px 0 5px;font-size:16px}
.payment-list p{margin:0;color:var(--muted);font-size:13px}

.payment-panel.avoid ul{display:grid;gap:10px;margin:0;padding:0;list-style:none}
.payment-panel.avoid li{position:relative;padding:12px 13px 12px 35px;border:1px solid rgba(169,94,45,.13);border-radius:15px;background:rgba(255,255,255,.76);color:#744629;font-size:13px;font-weight:720}
.payment-panel.avoid li::before{content:"×";position:absolute;left:13px;color:#a95e2d;font-weight:950}
.payment-note{margin-top:12px;padding:16px;border-radius:17px;background:var(--ink);color:#fff}
.payment-note strong{display:block;margin-bottom:5px;color:#f2c38f;font-size:11px;letter-spacing:.1em;text-transform:uppercase}
.payment-note p{margin:0;color:#d7e0e7;font-size:12px}

.payment-flow{display:flex;align-items:center;justify-content:center;gap:12px;margin-top:17px;padding:16px 20px;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:var(--small-shadow)}
.payment-flow span{padding:8px 12px;border-radius:999px;background:var(--blue-soft);color:var(--blue);font-size:12px;font-weight:850;text-align:center}
.payment-flow span:nth-of-type(3){background:var(--green-soft);color:var(--green-deep)}
.payment-flow i{color:#9aa5ae;font-style:normal}
.policy-links{display:flex;align-items:center;justify-content:flex-end;gap:15px;margin-top:13px;color:var(--muted);font-size:11px}
.policy-links span{margin-right:auto}
.policy-links a{color:var(--blue);font-weight:800;text-decoration:none}
.policy-links a:hover{text-decoration:underline}

.ref-card-player{
  grid-column:1/-1;
  display:grid;
  grid-template-columns:minmax(300px,.82fr) minmax(0,1.18fr);
  gap:0;
  padding:0;
  overflow:hidden;
  background:linear-gradient(135deg,#fff,#edf4ef);
  border-color:#cbdcd1;
  box-shadow:var(--small-shadow);
}

.ref-card-player figure{margin:0;min-height:285px;overflow:hidden;background:#172033}
.ref-card-player figure img{width:100%;height:100%;object-fit:cover;filter:saturate(.72) contrast(.96)}
.ref-card-player-copy{display:flex;flex-direction:column;padding:30px}
.ref-card-player h3{margin:9px 0 8px;font-size:31px;letter-spacing:-.04em}
.ref-card-player p{max-width:660px;margin:0 0 18px;font-size:15px}
.platform-availability{display:grid;grid-template-columns:1fr auto;align-items:center;gap:2px 12px}
.platform-availability .status{grid-row:1/3}
.platform-availability>b{padding:6px 10px;border-radius:999px;background:var(--green-deep);color:#fff;font-size:11px;letter-spacing:.05em;text-align:center}
.platform-availability>small{color:var(--muted);font-size:10px;text-align:right}
.ref-lessons{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 22px}
.ref-lessons span{padding:8px 11px;border:1px solid rgba(49,95,85,.14);border-radius:999px;background:rgba(255,255,255,.8);color:var(--green-deep);font-size:11px;font-weight:850}
.store-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:auto}
.ref-card .store-link{display:flex;align-items:center;gap:10px;min-width:185px;padding:10px 15px;border-radius:15px;background:var(--ink);color:#fff;text-decoration:none;box-shadow:0 8px 18px rgba(16,38,63,.13);transition:transform 180ms cubic-bezier(.22,1,.36,1),box-shadow 180ms ease}
.ref-card .store-link:hover{transform:translateY(-2px);text-decoration:none;box-shadow:0 12px 24px rgba(16,38,63,.2)}
.ref-card .store-link:active{transform:translateY(1px) scale(.98)}
.store-link i{width:27px;font-style:normal;font-size:25px;line-height:1;text-align:center}
.store-link.play-store i{display:grid;place-items:center;width:27px;height:27px;border-radius:8px;background:linear-gradient(135deg,#65d9a5,#4d86d8);font-size:12px}
.store-link span{display:grid;line-height:1.05}
.store-link small{font-size:8px;letter-spacing:.08em;text-transform:uppercase;opacity:.75}
.store-link strong{margin-top:3px;font-size:16px;letter-spacing:-.015em}

.ref-card:not(.ref-card-player){padding:0 23px 23px;overflow:hidden}
.ref-card-media{height:142px;margin:0 -23px 20px;overflow:hidden;background:#eef2f3;border-bottom:1px solid var(--line)}
.ref-card-media img{width:100%;height:100%;object-fit:cover;transition:transform 280ms cubic-bezier(.22,1,.36,1),filter 280ms ease}
.ref-card-media.contain img{object-fit:contain}
.ref-card-media.dark{background:#17112d}
.ref-card:not(.ref-card-player):hover .ref-card-media img{transform:scale(1.025);filter:saturate(.92)}
.ref-card-media.contain img{filter:saturate(.86)}
.ref-card-media.contain.dark img{width:112px;margin:auto}

@media(max-width:900px){
  .nav-actions{gap:0}
  .age-band-grid{grid-template-columns:1fr 1fr}
  .age-band.teen{grid-column:1/-1}
  .payment-layout{grid-template-columns:1fr}
  .ref-card-player{grid-template-columns:minmax(235px,.76fr) minmax(0,1.24fr)}
}

@media(max-width:620px){
  .brand{font-size:14px}
  .language-toggle{min-height:40px;padding-right:10px}
  .language-toggle-icon{width:28px;height:28px}
  .age-band-grid,.validation-grid{grid-template-columns:1fr}
  .age-band.teen{grid-column:auto}
  .age-band{min-height:0}
  .age-band h3{margin-top:26px}
  .priority-note{display:grid;gap:7px}
  .priority-note strong{white-space:normal}
  .payment-panel{padding:20px}
  .payment-list{grid-template-columns:1fr}
  .payment-flow{display:grid;grid-template-columns:1fr;gap:6px}
  .payment-flow i{transform:rotate(90deg);text-align:center}
  .policy-links{align-items:flex-start;flex-wrap:wrap;justify-content:flex-start}
  .policy-links span{width:100%;margin:0}
  .ref-card-player{grid-template-columns:1fr}
  .ref-card-player figure{min-height:190px;max-height:230px}
  .ref-card-player-copy{padding:23px}
  .ref-card-player h3{font-size:26px}
  .platform-availability{grid-template-columns:1fr;align-items:start}
  .platform-availability .status{grid-row:auto}
  .platform-availability>b{justify-self:start;margin-top:8px}
  .platform-availability>small{text-align:left}
  .store-links{display:grid}
  .ref-card .store-link{width:100%}
}

@media(prefers-reduced-motion:reduce){
  .language-toggle,.language-toggle-icon{transition:none}
}