/* 念匣 · Nianbox site. No third-party fonts, scripts or analytics. */
:root{
  --bg:#f7f4ef; --fg:#211c16; --muted:#6c6257; --line:#e4ddd2; --card:#fffdf9;
  --amber:#b8720c; --amber-strong:#a8640a; --amber-soft:#f6e5c6;
  --f-ui:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --f-round:ui-rounded,"SF Pro Rounded",-apple-system,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root{
  --bg:#161412; --fg:#eee8df; --muted:#a69b8d; --line:#2f2a24; --card:#1e1b18;
  --amber:#f0a73a; --amber-strong:#c27a12; --amber-soft:#3a2b14; color-scheme:dark}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.7 var(--f-ui);
  padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}
html[lang|="zh"] [lang="en"]{display:none!important}
html[lang="en"] [lang|="zh"]{display:none!important}
a{color:var(--amber)}
a:focus-visible,button:focus-visible{outline:2px solid var(--amber);outline-offset:2px;border-radius:4px}
.wrap{max-width:960px;margin:0 auto}
.narrow{max-width:720px}
header.site{display:flex;align-items:center;gap:16px;padding-block:20px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.brand img{border-radius:8px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--fg);font-weight:700;font-family:var(--f-round);font-size:18px}
nav.site{display:flex;gap:18px;margin-left:auto;flex-wrap:wrap;align-items:center;font-size:15px}
nav.site a{color:var(--fg);text-decoration:none}
nav.site a[aria-current="page"]{color:var(--amber);font-weight:600}
.lang{font:inherit;font-size:13px;background:none;border:1px solid var(--line);color:var(--fg);border-radius:999px;padding:3px 12px;cursor:pointer}
main{padding-block:48px 64px}
h1,h2,h3{font-family:var(--f-round);line-height:1.25;text-wrap:balance}
h1{font-size:clamp(32px,6vw,52px);margin:0 0 16px;letter-spacing:-.01em}
h2{font-size:24px;margin:48px 0 12px}
h3{font-size:18px;margin:28px 0 6px}
.lede{font-size:clamp(17px,2.4vw,20px);color:var(--muted);max-width:36em;margin:0}
.hero{display:grid;gap:28px;align-items:center;grid-template-columns:1fr auto;padding-block:24px 8px}
.hero-logo{width:min(180px,34vw);height:auto;filter:drop-shadow(0 18px 30px rgba(15,42,48,.35))}
.badge{display:inline-block;font-size:13px;padding:3px 12px;border-radius:999px;background:var(--amber-soft);color:var(--amber);font-weight:600;margin-bottom:16px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;margin-top:40px}
.feat{border-top:2px solid var(--amber);padding-top:14px;min-width:0}
.feat h3{margin:0 0 6px}
.feat p{margin:0;color:var(--muted);font-size:15px}
.promise{margin-top:56px;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:28px clamp(20px,4vw,40px)}
.promise ol{margin:12px 0 0;padding-left:1.3em;display:grid;gap:10px}
.promise li::marker{color:var(--amber);font-weight:700}
.doc p,.doc li{max-width:42em}
.doc ul{padding-left:1.3em;display:grid;gap:6px}
.meta{color:var(--muted);font-size:14px}
table{border-collapse:collapse;width:100%;font-size:15px}
.tablebox{overflow-x:auto;margin-top:12px}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-weight:600;white-space:nowrap}
footer.site{border-top:1px solid var(--line);padding-block:24px 40px;color:var(--muted);font-size:14px;display:flex;gap:18px;flex-wrap:wrap}
footer.site a{color:var(--muted)}
@media (max-width:620px){.hero{grid-template-columns:1fr}.hero-logo{order:-1;width:96px}nav.site{margin-left:0;width:100%}}
.promise h2{margin-top:0}
.promise .meta{margin:16px 0 0}