:root{
  --paper:#F6F2EB;      /* 暖纸白基底 */
  --paper2:#EFE9DE;     /* 略深纸色(分块) */
  --ink:#2E2822;        /* 深炭褐 正文 */
  --ink2:#4A4237;       /* 次级深色 */
  --mut:#8A8073;        /* 暖灰 */
  --line:#DDD4C5;       /* 细线 */
  --clay:#A15B48;       /* 赭石红(低饱和) */
  --clay-d:#8C4A39;     /* 赭石深 */
  --clay-bg:#F0E4DE;    /* 赭石浅底 */
  --gold:#B08A4F;       /* 暖金(哑) */
  --gold-bg:#EFE7D7;    /* 金浅底 */
  --dark:#2B2620;       /* 深色块(页脚/条) */
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei",-apple-system,sans-serif;color:var(--ink);background:var(--paper);line-height:1.8;overflow-x:hidden}
.serif{font-family:"Songti SC","STSong","Noto Serif SC","SimSun",serif}
.wrap{max-width:1100px;margin:0 auto;padding:0 28px;position:relative}
/* nav */
nav{position:sticky;top:0;z-index:50;background:rgba(246,242,235,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.seal{width:40px;height:40px;border-radius:8px;overflow:hidden;background:#FCFAF5;border:1px solid var(--line);display:flex;align-items:center;justify-content:center}
.seal img{width:100%;height:100%;object-fit:contain;display:block}
.brand span{color:var(--ink);font-size:17px;font-weight:600;letter-spacing:3px}
.brand small{color:var(--mut);font-size:11.5px;letter-spacing:2px}
nav ul{display:flex;gap:32px;list-style:none;align-items:center}
nav a.lk{color:var(--ink2);text-decoration:none;font-size:14.5px;letter-spacing:1px}
nav a.lk:hover{color:var(--clay)}
nav a.cta{color:#F9F4EC;background:var(--clay);font-weight:600;padding:9px 22px;border-radius:4px;text-decoration:none;font-size:14px;letter-spacing:2px}
nav a.cta:hover{background:var(--clay-d)}
/* hero */
.hero{padding:88px 0 92px;border-bottom:1px solid var(--line);position:relative;background:linear-gradient(180deg,var(--paper) 0%,#F2ECE1 100%)}
.hero .wrap{display:grid;grid-template-columns:1.12fr .88fr;gap:48px;align-items:center}
.kicker{display:inline-flex;align-items:center;gap:12px;color:var(--clay);font-size:13px;letter-spacing:5px}
.kicker::before,.kicker::after{content:"";width:34px;height:1px;background:var(--gold)}
.hero h1{margin-top:24px;font-size:clamp(32px,4.4vw,52px);font-weight:700;letter-spacing:3px;line-height:1.35;color:var(--ink)}
.hero h1 em{font-style:normal;color:var(--clay)}
.hero p.sub{margin-top:22px;max-width:500px;color:var(--mut);font-size:15.5px}
.hero .btns{margin-top:38px;display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 32px;border-radius:4px;text-decoration:none;font-size:15px;font-weight:600;letter-spacing:2px;transition:.22s}
.btn.pri{color:#F9F4EC;background:var(--clay)}
.btn.pri:hover{background:var(--clay-d)}
.btn.gh{color:var(--ink2);border:1px solid var(--line);background:rgba(255,255,255,.5)}
.btn.gh:hover{border-color:var(--gold);color:var(--gold)}
.hero .stats{margin-top:56px;display:flex;gap:58px;flex-wrap:wrap}
.hero .stats b{display:block;font-size:30px;font-weight:700;color:var(--ink);font-variant-numeric:tabular-nums}
.hero .stats b i{font-style:normal;color:var(--gold);font-size:18px}
.hero .stats span{color:var(--mut);font-size:12.5px;letter-spacing:2px}
/* 罗盘(线稿,赭金) */
.plate{width:min(400px,88%);margin:0 auto;position:relative}
.plate svg{width:100%;height:100%;display:block}
.plate .cap{position:absolute;bottom:-6px;left:50%;transform:translateX(-50%);white-space:nowrap;color:var(--mut);font-size:11.5px;letter-spacing:6px}
.spin-slow{animation:spin 120s linear infinite;transform-origin:center}
@keyframes spin{to{transform:rotate(360deg)}}
/* section */
section{padding:86px 0}
section.alt{background:var(--paper2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:680px;margin-bottom:46px}
.sec-head .tag{display:inline-block;color:var(--clay);font-size:12.5px;font-weight:600;letter-spacing:5px;margin-bottom:14px;padding-left:14px;border-left:3px solid var(--gold)}
.sec-head h2{font-size:clamp(25px,3.1vw,34px);font-weight:700;letter-spacing:3px}
.sec-head p{color:var(--mut);margin-top:12px;font-size:15px}
/* 卡片 */
.grid{display:grid;gap:20px}
.g2{grid-template-columns:1fr 1fr}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#FCFAF5;border:1px solid var(--line);border-radius:8px;padding:26px 22px;transition:.25s;position:relative}
.card:hover{border-color:var(--gold);box-shadow:0 10px 28px rgba(74,66,55,.1);transform:translateY(-3px)}
.card .no{position:absolute;right:16px;top:10px;font-size:30px;font-weight:700;color:#EAE2D2;font-family:Georgia,serif}
.card h3{font-size:17.5px;letter-spacing:1px;display:flex;align-items:center;gap:9px}
.card h3 .dot{width:9px;height:9px;background:var(--clay);transform:rotate(45deg);flex:none}
.card .st{margin:9px 0 10px;display:inline-block;font-size:12px;letter-spacing:2px;border-radius:3px;padding:2px 10px}
.st.on{color:var(--gold);border:1px solid #D8C9A8;background:var(--gold-bg)}
.st.hot{color:#F9F4EC;background:var(--clay)}
.card p{color:var(--mut);font-size:13.8px}
/* 主业深色条 */
.mainband{background:var(--dark);color:#EFE9DC;border-radius:10px;padding:46px 42px;position:relative;overflow:hidden}
.mainband::after{content:"遁甲";position:absolute;right:18px;bottom:6px;font-size:110px;font-weight:700;color:rgba(176,138,79,.07);letter-spacing:8px}
.mainband h2{font-size:clamp(23px,2.7vw,30px);letter-spacing:3px}
.mainband h2 b{color:#D9B36E}
.mainband>p{color:#B5AC9C;margin-top:12px;max-width:720px;font-size:14.5px}
.mainband .grid{margin-top:30px}
.mainband .card{background:rgba(246,242,235,.05);border-color:rgba(176,138,79,.28)}
.mainband .card:hover{border-color:#D9B36E;background:rgba(246,242,235,.09)}
.mainband .card .no{color:rgba(217,179,110,.14)}
.mainband .card h3{color:#EFE9DC}
.mainband .card p{color:#A79D8C}
.mainband .st.on{color:#D9B36E;border-color:rgba(217,179,110,.5);background:rgba(217,179,110,.08)}
.mainband .st.hot{background:var(--clay)}
/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.step{position:relative;padding:0 22px;border-left:1px solid var(--line)}
.step:first-child{border-left:none;padding-left:0}
.step .n{font-size:22px;font-weight:700;color:var(--gold);font-family:Georgia,serif}
.step b{display:block;font-size:15.5px;margin:8px 0 4px;letter-spacing:2px}
.step p{color:var(--mut);font-size:13px}
/* about */
.about{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:start}
.facts{border:1px solid var(--line);border-radius:8px;background:#FCFAF5;overflow:hidden}
.facts div{display:flex;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--line);font-size:14px}
.facts div:last-child{border-bottom:none}
.facts span{color:var(--mut);letter-spacing:1px}
.facts b{font-weight:600}
/* contact */
#contact .band{background:var(--dark);border-radius:10px;padding:50px 40px;text-align:center;position:relative;overflow:hidden}
#contact .band::before{content:"";position:absolute;left:0;top:0;width:100%;height:3px;background:linear-gradient(90deg,var(--clay),var(--gold))}
#contact h2{color:#EFE9DC;font-size:clamp(23px,2.9vw,30px);letter-spacing:3px}
#contact p{color:#B5AC9C;margin-top:10px;font-size:14.5px}
.cgrid{display:flex;gap:18px;justify-content:center;margin-top:28px;flex-wrap:wrap}
.cbox{border:1px solid rgba(217,179,110,.35);border-radius:6px;padding:16px 34px}
.cbox small{display:block;color:#9C927F;letter-spacing:4px;font-size:11px}
.cbox b{font-size:18px;color:#D9B36E;letter-spacing:1px;font-weight:600}
/* footer */
footer{background:var(--dark);color:#9C927F;padding:28px 0;font-size:12.5px;border-top:1px solid rgba(217,179,110,.2)}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;letter-spacing:1px}
footer a{color:#B5AC9C;text-decoration:none}
footer a:hover{color:#D9B36E}
.reveal{opacity:0;transform:translateY(18px);transition:.65s ease}
.reveal.on{opacity:1;transform:none}
@media(max-width:920px){
  nav ul{display:none}
  .hero .wrap{grid-template-columns:1fr}
  .plate{order:-1;width:min(280px,82%)}
  .g4{grid-template-columns:1fr 1fr}
  .g3,.g2{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr 1fr;gap:24px 0}
  .step{padding:0 0 0 16px}
  .about{grid-template-columns:1fr}
}

/* ===== 子页共用 ===== */
.phero{padding:64px 0 44px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,var(--paper) 0%,#F2ECE1 100%)}
.phero h1{font-size:clamp(28px,3.6vw,42px);letter-spacing:3px;font-weight:700}
.phero p{color:var(--mut);margin-top:10px;max-width:640px;font-size:15px}
.crumb{font-size:12.5px;color:var(--mut);letter-spacing:2px;margin-bottom:14px}
.crumb a{color:var(--gold);text-decoration:none}
nav a.lk.act{color:var(--clay);border-bottom:2px solid var(--gold);padding-bottom:2px}
/* 详情行(产品/案例) */
.drow{display:grid;grid-template-columns:200px 1fr;gap:36px;padding:38px 0;border-bottom:1px solid var(--line)}
.drow:last-child{border-bottom:none}
.drow .glyph{width:120px;height:120px;border:1px solid var(--line);border-radius:10px;background:#FCFAF5;display:flex;align-items:center;justify-content:center;font-size:44px;color:var(--clay);font-family:serif}
.drow h3{font-size:21px;letter-spacing:2px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.drow .desc{color:var(--mut);margin-top:10px;font-size:14.5px;max-width:720px}
.kv{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.kv span{font-size:12.5px;border:1px solid var(--line);border-radius:4px;padding:3px 12px;color:var(--ink2);background:#FCFAF5}
.kv span b{color:var(--gold);font-weight:600}
/* 技术栈表 */
table.tech{width:100%;border-collapse:collapse;background:#FCFAF5;border:1px solid var(--line);border-radius:8px;overflow:hidden}
table.tech th{background:var(--paper2);text-align:left;font-size:13.5px;letter-spacing:1px;padding:12px 18px;border-bottom:1px solid var(--line)}
table.tech td{padding:12px 18px;border-bottom:1px solid var(--line);font-size:14px;color:var(--ink2)}
table.tech tr:last-child td{border-bottom:none}
/* FAQ */
.faq{border:1px solid var(--line);border-radius:8px;background:#FCFAF5;margin-bottom:14px;overflow:hidden}
.faq summary{cursor:pointer;padding:16px 20px;font-size:15px;font-weight:600;letter-spacing:1px;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::after{content:"+";color:var(--gold);font-size:19px}
.faq[open] summary::after{content:"–"}
.faq .a{padding:0 20px 16px;color:var(--mut);font-size:14px}
/* 时间线 */
.tl{position:relative;padding-left:26px;border-left:2px solid var(--gold-bg)}
.tl .ev{position:relative;padding-bottom:26px}
.tl .ev::before{content:"";position:absolute;left:-33px;top:8px;width:12px;height:12px;border-radius:50%;background:var(--clay);border:2px solid var(--paper)}
.tl .ev b{font-size:15.5px;letter-spacing:1px}
.tl .ev i{font-style:normal;color:var(--gold);font-size:13px;margin-left:10px;letter-spacing:1px}
.tl .ev p{color:var(--mut);font-size:14px;margin-top:4px;max-width:560px}
/* 案例卡 */
.case{background:#FCFAF5;border:1px solid var(--line);border-radius:10px;padding:26px;transition:.25s}
.case:hover{border-color:var(--gold);box-shadow:0 10px 28px rgba(74,66,55,.1)}
.case .tag2{display:inline-block;font-size:11.5px;letter-spacing:2px;color:var(--clay);border:1px solid #E3CFC5;background:var(--clay-bg);border-radius:3px;padding:2px 10px;margin-bottom:10px}
.case h3{font-size:18px;letter-spacing:1px}
.case p{color:var(--mut);font-size:13.8px;margin-top:8px}
.case .kv{margin-top:12px}
@media(max-width:920px){.drow{grid-template-columns:1fr}.drow .glyph{width:84px;height:84px;font-size:32px}}