/* Shared by index.html (English) and index.zh.html (Chinese).
   Kept as one file so the two language versions cannot drift apart
   visually - a translated page that slowly loses alignment is worse
   than no translation. Same-origin file, so it is not a third-party
   request and the privacy policy still holds. */
:root{
  --bg:#0B1018; --panel:#111A25; --panel-2:#0E151F;
  --border:#1E2A38; --border-soft:#18222E;
  --text:#E8EEF5; --muted:#8494A6; --muted-2:#5C687A;
  --teal:#22D3A6; --teal-dim:#1FBF95; --blue:#4C8DFF; --warn:#F5A623;
  --on-teal:#05231B;
  --s1:4px; --s2:8px; --s3:12px; --s4:16px; --s5:24px; --s6:32px; --s7:48px; --s8:72px; --s9:96px;
  --r-sm:8px; --r-md:10px; --r-lg:16px; --r-pill:999px;
  --sh-edge:0 1px 0 rgba(255,255,255,.04) inset;
  --sh-card:0 24px 48px -24px rgba(0,0,0,.75);
  --max:1080px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",
         "PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:400 15.5px/1.7 var(--font);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.02em;line-height:1.15}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--teal);outline-offset:2px;border-radius:4px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 var(--s5)}
.num{font-family:var(--mono);font-variant-numeric:tabular-nums}

/* header */
header{position:sticky;top:0;z-index:20;background:rgba(11,16,24,.88);
  backdrop-filter:saturate(160%) blur(14px);border-bottom:1px solid var(--border-soft)}
.nav{display:flex;align-items:center;gap:var(--s5);height:62px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em}
.brand .dot{width:9px;height:9px;border-radius:50%;background:var(--teal);
  box-shadow:0 0 0 4px rgba(34,211,166,.14)}
.nav-links{display:flex;gap:var(--s5);margin-left:auto;font-size:13.5px;color:var(--muted)}
.nav-links a{padding:6px 0;border-bottom:1px solid transparent;transition:color .18s,border-color .18s}
.nav-links a:hover{color:var(--text);border-bottom-color:var(--border)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;
  padding:0 20px;border-radius:var(--r-md);font-size:14.5px;font-weight:600;
  border:1px solid transparent;cursor:pointer;white-space:nowrap;
  transition:transform .16s ease,background .18s,border-color .18s,box-shadow .18s}
.btn-primary{background:var(--teal);color:var(--on-teal);box-shadow:0 8px 24px -10px rgba(34,211,166,.6)}
.btn-primary:hover{background:var(--teal-dim);transform:translateY(-1px)}
.btn-ghost{border-color:var(--border);color:var(--text);background:transparent}
.btn-ghost:hover{border-color:var(--muted-2);transform:translateY(-1px)}
.btn-sm{height:36px;padding:0 14px;font-size:13px}
.btn-lg{height:50px;padding:0 26px;font-size:15.5px}

/* hero */
.hero{padding:var(--s9) 0 var(--s8);position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:-160px -10% auto -10%;height:520px;
  background:radial-gradient(60% 60% at 30% 20%,rgba(34,211,166,.13),transparent 70%),
             radial-gradient(50% 50% at 80% 0%,rgba(76,141,255,.10),transparent 70%);
  pointer-events:none}
.hero > .wrap{position:relative}
.chip{display:inline-flex;align-items:center;gap:8px;height:28px;padding:0 12px;
  border-radius:var(--r-pill);border:1px solid var(--border);background:var(--panel-2);
  font-size:12px;color:var(--muted);letter-spacing:.02em}
.chip b{color:var(--teal);font-weight:600}
h1{font-size:clamp(33px,4.3vw,52px);line-height:1.07;letter-spacing:-.03em;
  margin:var(--s5) 0 0;max-width:20ch;text-wrap:balance}
h1 .accent{color:var(--teal)}
.lede{margin-top:var(--s5);max-width:54ch;color:var(--muted);font-size:17px;line-height:1.65}
.cta-row{display:flex;flex-wrap:wrap;align-items:center;gap:var(--s4);margin-top:var(--s6)}
.cta-note{font-size:12.5px;color:var(--muted-2)}
.meta-row{display:flex;flex-wrap:wrap;gap:var(--s2) var(--s5);margin-top:var(--s6);
  font-size:12.5px;color:var(--muted-2)}
.meta-row span{display:flex;align-items:center;gap:6px}
.meta-row span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--teal);opacity:.7}

/* screenshot */
.shot{border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;
  background:var(--panel);box-shadow:var(--sh-card),var(--sh-edge)}
.shot-bar{display:flex;align-items:center;gap:8px;height:36px;padding:0 14px;
  border-bottom:1px solid var(--border-soft);background:var(--panel-2)}
.shot-bar i{width:9px;height:9px;border-radius:50%;background:#243244;display:block}
.shot-bar span{margin-left:8px;font:500 11.5px/1 var(--mono);color:var(--muted-2);letter-spacing:.04em}
.shot-cap{margin-top:var(--s3);font-size:12.5px;color:var(--muted-2);text-align:center}

/* sections */
section{padding:var(--s8) 0}
.sec-head{max-width:62ch;margin-bottom:var(--s7)}
.sec-head h2{font-size:clamp(23px,2.6vw,30px);margin-bottom:var(--s3)}
.sec-head p{color:var(--muted)}
.eyebrow{font:600 11.5px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;
  color:var(--teal);margin-bottom:var(--s3);display:block}

/* cards */
.grid{display:grid;gap:var(--s4)}
.g2{grid-template-columns:repeat(2,1fr)}
.card{border:1px solid var(--border);border-radius:var(--r-lg);padding:var(--s5);
  background:linear-gradient(180deg,var(--panel) 0%,var(--panel-2) 100%);box-shadow:var(--sh-edge)}
.card h3{font-size:16px;margin-bottom:var(--s3);display:flex;align-items:center;gap:10px}
.card h3 .k{flex:none;width:26px;height:26px;border-radius:8px;display:grid;place-items:center;
  background:rgba(34,211,166,.10);color:var(--teal);font:600 12px/1 var(--mono);
  border:1px solid rgba(34,211,166,.22)}
.card p{color:var(--muted);font-size:14.5px}
.card p + p{margin-top:var(--s3)}

/* steps */
.step{display:flex;gap:var(--s4);padding:var(--s5) 0;border-bottom:1px solid var(--border-soft)}
.step:last-child{border-bottom:0}
.step .n{flex:none;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;
  border:1px solid rgba(34,211,166,.35);color:var(--teal);font:600 13px/1 var(--mono)}
.step h3{font-size:15.5px;margin-bottom:6px}
.step p{color:var(--muted);font-size:14.5px;max-width:62ch}

/* single price */
.price-block{max-width:560px;margin:0 auto;border:1px solid rgba(34,211,166,.45);
  border-radius:var(--r-lg);padding:var(--s6);
  background:linear-gradient(180deg,rgba(34,211,166,.07) 0%,var(--panel) 46%);
  box-shadow:0 0 0 1px rgba(34,211,166,.12),0 32px 64px -32px rgba(34,211,166,.28);
  text-align:center}
/* baseline, not flex-start: with flex-start the "$" floated above the digits and
   the amount read as two stacked elements instead of one price. */
.price-block .amount{display:flex;align-items:baseline;justify-content:center;gap:2px;margin:var(--s4) 0 6px}
.price-block .cur{font-size:22px;color:var(--muted);font-weight:600;line-height:1}
.price-block .amt{font:700 54px/1 var(--mono);letter-spacing:-.03em}
.price-block .per{font-size:13px;color:var(--muted-2);margin-left:8px}
.price-block .lead{font-size:14px;color:var(--muted);margin-bottom:var(--s5)}
.price-block ul{display:flex;flex-direction:column;gap:10px;text-align:left;
  margin:0 auto var(--s5);max-width:390px;font-size:14px;color:var(--muted)}
.price-block li{display:flex;gap:10px;align-items:flex-start;line-height:1.5}
.price-block li::before{content:"\2713";flex:none;width:14px;margin-top:1px;
  color:var(--teal);font:700 11px/1.4 var(--font)}
.price-fine{margin-top:var(--s4);font-size:12.5px;color:var(--muted-2)}

/* faq */
.faq{border-top:1px solid var(--border-soft)}
.faq details{border-bottom:1px solid var(--border-soft)}
.faq summary{list-style:none;cursor:pointer;padding:var(--s5) 0;display:flex;
  align-items:center;justify-content:space-between;gap:var(--s5);font-size:15px;font-weight:600}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";flex:none;font:400 20px/1 var(--mono);color:var(--muted-2);transition:color .2s}
.faq details[open] summary::after{content:"\2212";color:var(--teal)}
.faq .ans{padding:0 0 var(--s5);color:var(--muted);max-width:74ch;font-size:14.5px}
.faq .ans code{font-family:var(--mono);font-size:12.8px;color:var(--teal);
  background:rgba(34,211,166,.08);padding:1px 5px;border-radius:4px}

/* risk */
.risk{border:1px solid rgba(245,166,35,.28);border-radius:var(--r-lg);
  background:linear-gradient(180deg,rgba(245,166,35,.07),rgba(245,166,35,.02));
  padding:var(--s5)}
.risk h3{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--warn);
  display:flex;align-items:center;gap:8px;margin-bottom:var(--s3)}
.risk p{color:var(--muted);font-size:13.8px;line-height:1.72}
.risk p + p{margin-top:var(--s3)}
.risk strong{color:var(--text);font-weight:600}

/* footer */
footer{border-top:1px solid var(--border-soft);padding:var(--s7) 0 var(--s6);margin-top:var(--s6)}
.foot{display:flex;flex-wrap:wrap;gap:var(--s5);align-items:flex-start;justify-content:space-between}
.foot-col{font-size:13px;color:var(--muted-2)}
.foot-col h4{font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);
  margin-bottom:var(--s3);font-family:var(--mono)}
.foot-col ul{display:flex;flex-direction:column;gap:8px}
.foot-col a:hover{color:var(--teal)}
.foot-bottom{margin-top:var(--s6);padding-top:var(--s4);border-top:1px solid var(--border-soft);
  display:flex;flex-wrap:wrap;gap:var(--s3) var(--s5);justify-content:space-between;
  font-size:12px;color:var(--muted-2)}

@media (max-width:720px){
  :root{--s8:48px;--s9:56px}
  .nav-links{display:none}
  .g2{grid-template-columns:1fr}
  .hero{padding-top:var(--s8)}
  h1{max-width:100%}
  .lede{font-size:16px}
  .meta-row{font-size:12px;gap:6px var(--s4)}
  .price-block{padding:var(--s5)}
  .price-block .amt{font-size:44px}
  .cta-row{flex-direction:column;align-items:stretch}
  .cta-row .btn{width:100%}
  .cta-note{text-align:center}
}
@media (prefers-reduced-motion:reduce){ *{transition:none!important;animation:none!important} }
/* --- CJK typography -------------------------------------------------------
   `ch` is the width of "0", so a 20ch cap that suits English squeezes a Chinese
   headline into an early break and splits a word across lines ("...不 / 用拿...").
   Chinese needs (a) a wider cap and (b) an explicit break opportunity, because
   there are no spaces for the browser to break at.
   ------------------------------------------------------------------------- */
html[lang="zh-CN"] h1{max-width:16em;letter-spacing:-.01em}
html[lang="zh-CN"] .lede{max-width:37em;text-wrap:pretty;line-break:strict}
.br-wide{display:none}
@media (min-width:820px){ .br-wide{display:inline} }