/* App Purchase Vault — guides stylesheet (staging, mirrors landing design) */
:root{--bg:#f8f8f8;--surface:#fff;--ink:#141414;--muted:#5c5c5c;--faint:#9a9a9a;--line:#e8e8e8;--accent:#f54001;--tint:#fff1ea;--radius:8px}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font:16px/1.65 Inter,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* header */
header.site{position:sticky;top:0;z-index:50;background:rgba(248,248,248,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
header.site .bar{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:15px;color:var(--ink);letter-spacing:-.01em}
.brand:hover{text-decoration:none}
.brand .mark{width:26px;height:26px;display:grid;place-items:center}
.brand .mark img{width:26px;height:26px;display:block}
.pill{display:inline-block;background:var(--accent);color:#fff;font-weight:700;font-size:13.5px;padding:9px 18px;border-radius:99px;letter-spacing:-.01em}
.pill:hover{text-decoration:none;filter:brightness(.94)}

/* breadcrumb */
.crumb{font-size:12.5px;color:var(--faint);padding:18px 0 0;letter-spacing:.01em}
.crumb a{color:var(--faint)}
.crumb a:hover{color:var(--accent)}

/* article */
article{max-width:740px;margin:0 auto;padding:34px 24px 20px}
.kicker{font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:14px}
h1{font-size:clamp(30px,4.6vw,44px);line-height:1.08;letter-spacing:-.03em;font-weight:800;margin-bottom:18px}
.lede{font-size:18px;color:var(--muted);line-height:1.6;margin-bottom:10px}
.meta{font-size:12.5px;color:var(--faint);margin:16px 0 8px;padding-bottom:22px;border-bottom:1px solid var(--line)}
h2{font-size:25px;letter-spacing:-.02em;line-height:1.2;margin:44px 0 14px;font-weight:800}
h3{font-size:18px;letter-spacing:-.01em;margin:30px 0 10px;font-weight:700}
p{margin-bottom:16px}
ul,ol{margin:0 0 16px 22px}
li{margin-bottom:8px}
strong{font-weight:700}

/* toc */
.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;margin:26px 0 8px;font-size:14.5px}
.toc .t{font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:10px}
.toc ol{margin:0 0 0 20px}
.toc li{margin-bottom:6px}
.toc a{color:var(--ink)}
.toc a:hover{color:var(--accent)}

/* callouts */
.note{background:var(--tint);border-radius:var(--radius);padding:16px 20px;margin:22px 0;font-size:14.5px}
.note .t{font-weight:700;color:var(--accent);font-size:12px;letter-spacing:.1em;text-transform:uppercase;display:block;margin-bottom:6px}
.note.plain{background:var(--surface);border:1px solid var(--line)}
.note.plain .t{color:var(--ink)}

/* tables */
table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin:20px 0 26px;font-size:14.5px;display:block;overflow-x:auto}
thead,tbody{display:table;width:100%;min-width:520px}
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:11.5px;text-transform:uppercase;letter-spacing:.1em;color:var(--faint);background:#fcfcfc}
tr:last-child td{border-bottom:none}

/* steps */
.steps{counter-reset:s;margin:20px 0 26px}
.step{display:flex;gap:16px;padding:16px 0;border-bottom:1px solid var(--line)}
.step:last-child{border-bottom:none}
.step::before{counter-increment:s;content:counter(s);flex:0 0 30px;height:30px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font-size:13px;font-weight:700;margin-top:2px}
.step b{display:block;margin-bottom:2px}
.step p{margin:0;color:var(--muted);font-size:15px}

/* code */
pre{background:#141414;color:#e8e8e8;border-radius:var(--radius);padding:18px 20px;overflow-x:auto;font:13px/1.6 ui-monospace,SFMono-Regular,Menlo,monospace;margin:18px 0 24px}
code{font:13.5px ui-monospace,SFMono-Regular,Menlo,monospace;background:#efefef;padding:1px 6px;border-radius:5px}
pre code{background:none;padding:0}

/* faq */
details{border-bottom:1px solid var(--line)}
summary{cursor:pointer;padding:16px 0;font-weight:600;font-size:15.5px;list-style:none;position:relative;padding-right:28px}
summary::after{content:"+";position:absolute;right:2px;top:14px;font-size:19px;color:var(--faint);font-weight:400}
details[open] summary::after{content:"–"}
details p{color:var(--muted);font-size:15px;padding-bottom:16px;margin:0}

/* related + cta */
.related{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px;margin:40px 0 0}
.related .t{font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:12px}
.related ul{margin:0 0 0 18px}
.related li{margin-bottom:8px}
.related a{color:var(--ink);font-weight:600}
.related a:hover{color:var(--accent)}
.related span{color:var(--muted);font-weight:400;font-size:14px}
.cta-band{background:var(--tint);border-radius:var(--radius);padding:26px 28px;margin:28px 0 0;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.cta-band h2{margin:0 0 6px;font-size:21px}
.cta-band p{margin:0;color:var(--muted);font-size:14.5px}
.cta-band .pill{flex-shrink:0}

/* footer */
footer.site{border-top:1px solid var(--line);margin-top:70px;padding:34px 0 44px;font-size:13px;color:var(--faint)}
footer.site .grid{display:flex;justify-content:space-between;gap:26px;flex-wrap:wrap}
footer.site b{color:var(--ink);display:block;margin-bottom:4px;font-size:14px}
footer.site a{color:var(--faint)}
footer.site a:hover{color:var(--accent)}
footer.site .nav a{display:block;margin-bottom:6px}

@media (max-width:640px){
  article{padding:26px 20px 10px}
  .cta-band{flex-direction:column;align-items:flex-start}
}