/* AI云 site: ivory paper, walnut ink, champagne-gold accents (AIYun brand v3). */
:root{
  --ivory:#F7F1E6; --paper:#FBF7EF; --paper-2:#EFE5D4; --sand:#DBBE94; --gold:#CCA06A; --gold-d:#A9824F;
  --bronze:#8C613A; --walnut:#6A472D; --forest:#11372D; --ink:#2B1E14; --ink-2:#4A3627; --ink-3:#7A6250;
  --line:#E6D8C1; --line-2:#D9C6A6; --bg-deep:#1C140E; --r:18px;
  --serif:"Noto Serif SC","Songti SC",Georgia,serif; --sans:Inter,"Noto Sans SC","PingFang SC",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--ivory);color:var(--ink);font:16px/1.65 var(--sans);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:6px}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
.eyebrow{font-size:12px;letter-spacing:.24em;text-transform:uppercase;color:var(--bronze);font-weight:500;margin:0 0 14px}
h1,h2,h3{font-family:var(--serif);color:var(--ink);line-height:1.18;margin:0}
h1{font-size:clamp(36px,5.4vw,62px);font-weight:700;letter-spacing:-.01em}
h2{font-size:clamp(28px,3.4vw,40px);font-weight:700}
h3{font-size:20px;font-weight:700}
.gold{color:var(--gold-d)}
h1 .gold{white-space:nowrap}
.lead{font-size:clamp(17px,1.6vw,19px);color:var(--ink-2);max-width:620px}
.btn{display:inline-flex;align-items:center;gap:8px;text-decoration:none;font-weight:600;font-size:15px;border-radius:999px;padding:13px 22px;transition:transform .2s,background .2s,box-shadow .2s;border:1px solid transparent}
.btn-dark{background:var(--ink);color:var(--ivory)}
.btn-dark:hover{background:#3d2b1e;transform:translateY(-1px)}
.btn-line{border-color:var(--line-2);color:var(--ink)}
.btn-line:hover{border-color:var(--gold);background:var(--paper)}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(247,241,230,.9);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:22px;height:64px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:600;letter-spacing:.02em}
.logo img{height:30px;width:auto}
.logo span{font-family:var(--serif);font-size:19px}
.nav nav{display:flex;gap:22px;margin-left:auto;font-size:14.5px}
.nav nav a{text-decoration:none;color:var(--ink-2)}
.nav nav a:hover{color:var(--ink)}
.lang{font-size:13px;text-decoration:none;border:1px solid var(--line-2);border-radius:999px;padding:5px 11px;color:var(--ink-2)}
.nav .btn{padding:9px 16px;font-size:14px}
@media (max-width:860px){.nav nav{display:none}.lang{margin-left:auto}}
@media (max-width:420px){.nav .btn{display:none}}

/* hero */
.hero{padding:72px 0 56px}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero .ctas{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.hero-img{border-radius:24px;overflow:hidden;box-shadow:0 30px 80px rgba(43,30,20,.22);aspect-ratio:1400/767;background:var(--bg-deep)}
.hero-img img{width:100%;height:100%;object-fit:cover}
.hero .meta{margin-top:26px;font-size:13.5px;color:var(--ink-3)}
@media (max-width:900px){.hero{padding:40px 0}.hero .wrap{grid-template-columns:1fr;gap:32px}}

/* sections */
section{padding:72px 0}
.sec-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:36px;flex-wrap:wrap}
.sec-head p{margin:10px 0 0;color:var(--ink-2);max-width:620px}
.band{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.dark{background:linear-gradient(170deg,#140E09,#24180F 55%,#33241A);color:var(--ivory)}
.dark h2,.dark h3{color:var(--ivory)}
.dark .eyebrow{color:var(--sand)}
.dark p{color:rgba(247,241,230,.74)}

/* apps */
.apps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.app{display:flex;gap:14px;align-items:flex-start;padding:18px;border:1px solid var(--line);border-radius:var(--r);background:var(--ivory);text-decoration:none;transition:border-color .2s,transform .2s,box-shadow .2s}
.app:hover{border-color:var(--gold);transform:translateY(-2px);box-shadow:0 10px 30px rgba(43,30,20,.08)}
.app img{width:52px;height:52px;border-radius:13px;flex:none}
.app b{display:block;font-size:16px}
.app small{display:block;color:var(--bronze);font-size:12px;letter-spacing:.06em;text-transform:uppercase;margin:1px 0 4px}
.app span{display:block;font-size:14px;color:var(--ink-2);line-height:1.5}
.app .tag{display:inline-block;font-size:11px;padding:1px 8px;border-radius:999px;background:#E8F0E9;color:var(--forest);margin-left:6px;vertical-align:2px;letter-spacing:0;text-transform:none}
@media (max-width:900px){.apps{grid-template-columns:1fr 1fr}}
@media (max-width:600px){.apps{grid-template-columns:1fr}}
.shots{display:grid;grid-template-columns:1fr 1fr;align-items:start;gap:16px;margin-top:28px}
.shots figure{margin:0;border-radius:16px;overflow:hidden;border:1px solid var(--line);background:#fff}
.shots figcaption{font-size:13px;color:var(--ink-3);padding:10px 14px;border-top:1px solid var(--line);background:var(--paper)}
@media (max-width:760px){.shots{grid-template-columns:1fr}}

/* services */
.svc{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.svc article{border:1px solid rgba(219,190,148,.22);border-radius:var(--r);padding:26px;background:rgba(255,248,235,.03)}
.svc article .n{font-family:var(--serif);color:var(--gold);font-size:15px;margin-bottom:10px}
.svc article p{margin:10px 0 0;font-size:15px}
.svc ul{margin:12px 0 0;padding-left:18px;font-size:14px;color:rgba(247,241,230,.7)}
@media (max-width:760px){.svc{grid-template-columns:1fr}}
.dark .btn-line{border-color:rgba(219,190,148,.4);color:var(--ivory)}
.dark .btn-line:hover{background:rgba(255,248,235,.06)}
.gold-btn{background:var(--gold);color:var(--ink)}
.gold-btn:hover{background:#d9b07c;transform:translateY(-1px)}

/* steps / story */
.story{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.steps{counter-reset:s;list-style:none;margin:0;padding:0;display:grid;gap:14px}
.steps li{counter-increment:s;position:relative;padding:16px 18px 16px 58px;border:1px solid var(--line);border-radius:14px;background:var(--paper)}
.steps li::before{content:counter(s,decimal-leading-zero);position:absolute;left:18px;top:15px;font-family:var(--serif);color:var(--gold-d);font-weight:700}
.steps b{display:block}
.steps span{font-size:14.5px;color:var(--ink-2)}
@media (max-width:860px){.story{grid-template-columns:1fr;gap:28px}}

/* guides */
.guides{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.guide{display:block;text-decoration:none;padding:22px;border-radius:var(--r);border:1px solid var(--line);background:var(--ivory);transition:border-color .2s}
.guide:hover{border-color:var(--gold)}
.guide small{color:var(--bronze);font-size:12px;letter-spacing:.12em;text-transform:uppercase}
.guide h3{font-size:18px;margin:8px 0 6px}
.guide p{margin:0;font-size:14px;color:var(--ink-2)}
@media (max-width:900px){.guides{grid-template-columns:1fr}}

/* about */
.about{display:grid;grid-template-columns:.8fr 1.2fr;gap:48px}
.about p{color:var(--ink-2)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.chips span{font-size:13px;border:1px solid var(--line-2);border-radius:999px;padding:5px 12px;color:var(--ink-2)}
@media (max-width:860px){.about{grid-template-columns:1fr;gap:20px}}

/* cta + footer */
.cta{text-align:center}
.cta p{margin:14px auto 26px;max-width:560px;color:var(--ink-2)}
.cta .ctas{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
footer{border-top:1px solid var(--line);padding:34px 0 90px;font-size:13.5px;color:var(--ink-3)}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
footer a{color:var(--ink-2);text-decoration:none;margin-right:16px}
footer a:hover{color:var(--ink)}

/* guide (article) pages */
.article{max-width:760px;margin:0 auto;padding:56px 24px 40px}
.article h1{font-size:clamp(32px,4.4vw,48px);margin-bottom:16px}
.article h2{font-size:26px;margin:44px 0 12px}
.article h3{font-size:19px;margin:28px 0 8px}
.article p,.article li{color:var(--ink-2);font-size:17px}
.article .dek{font-size:19px;color:var(--ink-2);margin:0 0 10px}
.article .byline{font-size:13.5px;color:var(--ink-3);margin-bottom:30px}
.article table{width:100%;border-collapse:collapse;margin:18px 0;font-size:15px}
.article th,.article td{border-bottom:1px solid var(--line);padding:10px 8px;text-align:left;vertical-align:top}
.article th{color:var(--walnut);font-weight:600}
.article blockquote{margin:22px 0;padding:14px 20px;border-left:3px solid var(--gold);background:var(--paper);border-radius:0 12px 12px 0}
.tryit{display:flex;gap:16px;align-items:center;margin:30px 0;padding:20px;border-radius:var(--r);background:var(--paper);border:1px solid var(--line)}
.tryit img{width:56px;height:56px;border-radius:14px;flex:none}
.tryit p{margin:0;font-size:15px}
.tryit .btn{margin-left:auto;flex:none}
@media (max-width:600px){.tryit{flex-wrap:wrap}.tryit .btn{margin-left:0}}
.crumbs{font-size:13px;color:var(--ink-3);margin-bottom:22px}
.crumbs a{text-decoration:none;color:var(--bronze)}
.article .faq h3{font-size:18px;margin:22px 0 6px}
.article .faq{border-top:1px solid var(--line);padding-top:6px}