/* Numbered Camera — product site. Light SaaS look (ref: codexsync.org),
   accent = the app's plate-yellow #FFD41F, digits always IBM Plex Mono. */
:root{
  --bg:#ffffff; --bg-soft:#f7f7f5; --ink:#101014; --muted:#5c5f66; --dim:#9a9ca3;
  --hair:#e8e8e4; --accent:#FFD41F; --accent-ink:#17160f; --accent-dim:#8a6d00;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:"Inter","Noto Sans SC",-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --radius:14px; --maxw:1080px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  font-size:16px;line-height:1.7;padding:0 20px}
/* 带 width/height 属性的图必须同时放开 height，否则 max-width 缩了宽、
   高度还停在原始像素上，长条截图会把版面撑爆 */
img{max-width:100%;height:auto}
a{color:inherit}
.wrap{max-width:var(--maxw);margin:0 auto}
.mono{font-family:var(--mono)}

/* nav */
nav{position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--hair);margin:0 -20px;padding:0 20px;z-index:20}
.nav-in{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:26px;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:16.5px;
  text-decoration:none;margin-right:auto}
.brand img{width:30px;height:30px;border-radius:8px}
nav a.link{font-size:14px;color:var(--muted);text-decoration:none}
nav a.link:hover{color:var(--ink)}
.lang{font-family:var(--mono);font-size:13px;border:1px solid var(--hair);
  border-radius:999px;padding:4px 13px;text-decoration:none;color:var(--muted)}
.lang:hover{border-color:var(--ink);color:var(--ink)}
.nav-cta{background:var(--ink);color:#fff;font-size:14px;font-weight:600;
  border-radius:10px;padding:8px 16px;text-decoration:none}

/* hero */
header.hero{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;
  padding-block:72px 56px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);
  font-weight:600;font-size:13px;letter-spacing:1px}
.eyebrow .chip{background:var(--accent);color:var(--accent-ink);border-radius:7px;padding:1px 9px}
.eyebrow .arrow{color:var(--dim)}
h1{font-size:clamp(34px,5vw,56px);line-height:1.12;letter-spacing:-.02em;
  font-weight:800;margin:18px 0 20px;text-wrap:balance}
h1 .hl{background:linear-gradient(transparent 62%,var(--accent) 62%)}
.hero p.sub{color:var(--muted);font-size:17.5px;max-width:34em;margin:0 0 28px}
/* 中文字身占满行盒，英文那套 1.12 行高会把笔画压到贴边 */
:lang(zh-Hans) h1{line-height:1.28;letter-spacing:0}
:lang(zh-Hans) h2{line-height:1.35}
:lang(zh-Hans) .hero p.sub{max-width:26em}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:22px}
.btn{display:inline-flex;flex-direction:column;justify-content:center;border-radius:12px;
  padding:10px 22px;text-decoration:none;line-height:1.25;min-height:52px}
.btn .small{font-size:11px;opacity:.72}
.btn .big{font-size:16.5px;font-weight:700}
.btn-dark{background:var(--ink);color:#fff}
.btn-line{border:1px solid var(--hair);color:var(--ink);background:#fff}
.btn.soon{cursor:default;opacity:.55}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips span{border:1px solid var(--hair);background:var(--bg-soft);border-radius:999px;
  font-size:12.5px;color:var(--muted);padding:4px 13px}
/* 截图是 663×1440 的长条，按宽度铺满会把英雄区撑到两屏高，按高度收 */
.phone{justify-self:center;width:min(246px,72%)}
.phone img{display:block;border-radius:32px;border:1px solid var(--hair);
  box-shadow:0 30px 70px -30px rgba(16,16,20,.35)}

/* sections */
section{padding-block:64px 24px}
.sec-eyebrow{font-family:var(--mono);font-size:12px;font-weight:600;letter-spacing:2.5px;
  color:var(--accent-dim);text-transform:uppercase;margin:0 0 10px}
h2{font-size:clamp(26px,3.4vw,36px);letter-spacing:-.015em;font-weight:800;
  margin:0 0 14px;text-wrap:balance}
.lede{color:var(--muted);max-width:44em;margin:0 0 36px}

/* feature cards */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{border:1px solid var(--hair);border-radius:var(--radius);padding:22px 22px 18px;background:#fff}
.card .num{font-family:var(--mono);font-weight:600;font-size:13px;
  background:var(--accent);color:var(--accent-ink);border-radius:7px;padding:1px 9px;
  display:inline-block;margin-bottom:12px}
.card h3{font-size:16.5px;margin:0 0 6px}
.card p{font-size:14px;color:var(--muted);margin:0}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.step{border:1px solid var(--hair);border-radius:var(--radius);padding:20px;background:#fff}
.step .dot{width:34px;height:34px;border-radius:50%;background:var(--ink);color:var(--accent);
  font-family:var(--mono);font-weight:600;display:flex;align-items:center;justify-content:center;
  margin-bottom:14px}
.step h3{font-size:15.5px;margin:0 0 6px}
.step p{font-size:13.5px;color:var(--muted);margin:0}

/* gallery */
.shots{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.shots figure{margin:0}
.shots img{border-radius:18px;border:1px solid var(--hair);display:block}
.shots figcaption{font-size:13px;color:var(--muted);margin-top:9px;line-height:1.5}

/* privacy band */
.band{background:var(--ink);color:#f3f2ec;border-radius:20px;padding:44px 40px;
  display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;margin-top:40px}
.band h2{color:#fff;margin-bottom:8px}
.band p{color:#b9b8ae;margin:0;max-width:36em}
.band .mark{font-family:var(--mono);font-weight:600;background:var(--accent);
  color:var(--accent-ink);border-radius:12px;padding:10px 18px;font-size:15px;white-space:nowrap}

/* faq */
.faq{max-width:760px}
.faq details{border-bottom:1px solid var(--hair);padding:4px 0}
.faq summary{cursor:pointer;font-weight:600;font-size:15.5px;padding:14px 0;list-style:none;
  display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);color:var(--dim)}
.faq details[open] summary::after{content:"−"}
.faq details p{margin:0 0 16px;color:var(--muted);font-size:14.5px}

/* footer */
footer{border-top:1px solid var(--hair);margin-top:64px;padding-block:28px 40px;
  display:flex;flex-wrap:wrap;gap:10px 28px;align-items:center;font-size:13.5px;color:var(--muted)}
footer a{color:var(--muted)}
footer .spacer{margin-left:auto}

/* prose (privacy page) */
.prose{max-width:720px;padding-block:56px}
.prose h1{font-size:clamp(28px,4vw,40px)}
.prose h2{font-size:20px;margin-top:36px}
.prose p,.prose li{color:#3c3e44;font-size:15.5px}
.prose .updated{font-family:var(--mono);font-size:13px;color:var(--dim)}
:lang(zh-Hans) .prose .updated{font-family:var(--sans)}

:focus-visible{outline:2px solid var(--accent-dim);outline-offset:2px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media (max-width:920px){
  header.hero{grid-template-columns:1fr;padding-block:48px 40px}
  .phone{justify-self:start}
  .grid3{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr 1fr}
  .shots{grid-template-columns:1fr 1fr}
  .band{grid-template-columns:1fr}
}
@media (max-width:520px){
  .grid3{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .nav-in{gap:14px}
  nav a.link{display:none}
}