@charset "UTF-8";
/* 彬城AI · binchengai.com  —  子页面共用样式
   设计令牌与首页 index.html 内联样式保持完全一致。
   注意：本文件是首页内联样式的镜像副本；若调整首页设计，需同步本文件。 */

:root{
  --red:#8B0C09; --red-bright:#A3241F; --red-deep:#6E0B08;
  --ink:#2B2B2B; --sub:#757069; --hair:#E6E1D8;
  --paper:#FFFFFF; --sand:#F7F4EF; --dark:#241F1E;
  --sans:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--paper);line-height:1.8;font-size:15.5px}
a{color:inherit;text-decoration:none}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
p{text-wrap:pretty}

/* 顶栏 */
.topbar{background:var(--red-deep);color:#F2E4E0;font-size:12px}
.topbar .wrap{display:flex;justify-content:space-between;padding:6px 24px}
header{position:sticky;top:0;background:#fff;border-bottom:1px solid var(--hair);z-index:60}
.mast{display:flex;align-items:center;justify-content:space-between;height:74px}
.logo{display:flex;align-items:center;gap:12px}
.logo .mark{width:42px;height:42px;background:var(--red);color:#fff;font-size:22px;font-weight:700;display:flex;align-items:center;justify-content:center;font-family:"SimSun","宋体",serif}
.logo b{font-size:19px;font-weight:700;letter-spacing:.05em;display:block;line-height:1.3}
.logo small{font-size:10.5px;color:var(--sub);letter-spacing:.18em;display:block}
nav{display:flex;gap:34px;font-size:15px}
nav a{padding:4px 0;border-bottom:2px solid transparent}
nav a:hover{color:var(--red);border-bottom-color:var(--red)}
nav a.on{color:var(--red);border-bottom-color:var(--red);font-weight:600}

/* 板块标题 */
.sec{padding:78px 0 0}
.sec-head{margin-bottom:38px}
.sec-head .bar{width:44px;height:4px;background:var(--red);margin-bottom:14px}
.sec-head h2{font-size:28px;font-weight:700;letter-spacing:.06em}
.sec-head h2 span{font-size:15px;font-weight:400;color:var(--sub);margin-left:14px;letter-spacing:.1em}
.more{font-size:13.5px;color:var(--red);border-bottom:1px solid var(--red);padding-bottom:2px}
.head-row{display:flex;align-items:flex-end;justify-content:space-between}

footer{background:var(--dark);color:#B9B2AB;font-size:13px}
footer .wrap{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;padding:26px 24px}
footer a:hover{color:#fff}

.reveal{opacity:0;transform:translateY(10px);transition:opacity .7s ease,transform .7s ease}
.reveal.on{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ============ 子页面专用 ============ */

/* 页头横幅 */
.page-hero{position:relative;background:var(--dark);color:#fff;overflow:hidden}
.page-hero .bg{position:absolute;inset:0;background:linear-gradient(115deg,#8B0C09 0%,#5E0D0A 55%,#3B312E 100%)}
.page-hero .bg::after{content:"";position:absolute;inset:0;background:repeating-linear-gradient(115deg,transparent 0 90px,rgba(255,255,255,.035) 90px 92px)}
.page-hero .wrap{position:relative;z-index:2;padding-top:56px;padding-bottom:52px}
.crumb{font-size:12.5px;letter-spacing:.12em;color:#E9B9B4;margin-bottom:16px}
.crumb a{color:#E9B9B4;border-bottom:1px solid rgba(233,185,180,.45);padding-bottom:1px}
.crumb a:hover{color:#fff;border-bottom-color:#fff}
.crumb i{font-style:normal;margin:0 8px;opacity:.6}
.page-hero h1{font-size:33px;font-weight:700;letter-spacing:.05em;line-height:1.45}
.page-hero h1 em{font-style:normal;display:block;font-size:12.5px;font-weight:400;letter-spacing:.26em;color:#E9B9B4;margin-top:12px}
.page-hero .lead{margin-top:16px;font-size:15.5px;color:rgba(255,255,255,.86);max-width:790px;line-height:1.95}

/* 正文排版 */
.prose{font-size:15.5px;line-height:2;color:#3A3733;max-width:900px}
.prose p{margin-bottom:1.15em}
.prose b{color:var(--red);font-weight:600}
.prose h3{font-size:19px;font-weight:700;letter-spacing:.05em;margin:34px 0 12px;color:var(--ink)}
.prose ul{list-style:none;margin-bottom:1.15em}
.prose ul li{position:relative;padding-left:20px;margin-bottom:7px}
.prose ul li::before{content:"·";position:absolute;left:3px;color:var(--red);font-weight:700;font-size:18px;line-height:1.75}

/* 信息表 */
.kv{border:1px solid var(--hair);border-top:3px solid var(--red);background:#fff;max-width:960px}
.kv-row{display:grid;grid-template-columns:186px 1fr;border-bottom:1px solid var(--hair)}
.kv-row:last-child{border-bottom:none}
.kv-row dt{padding:15px 22px;font-size:13.5px;color:var(--sub);background:var(--sand);letter-spacing:.06em;border-right:1px solid var(--hair)}
.kv-row dd{padding:15px 22px;font-size:14.5px;color:var(--ink)}

/* 双栏面板 */
.duo{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.panel{border:1px solid var(--hair);background:#fff;padding:26px 28px}
.panel h3{font-size:17.5px;font-weight:700;margin-bottom:4px;letter-spacing:.04em}
.panel .en{font-size:11px;color:#B4AC9F;letter-spacing:.14em;margin-bottom:14px}
.panel p{font-size:14.5px;color:#4A4642}
.panel ul{list-style:none;margin-top:6px}
.panel ul li{font-size:14px;color:#4A4642;padding:6px 0;border-top:1px dashed var(--hair)}
.panel ul li::before{content:"·";color:var(--red);font-weight:700;margin-right:8px}

/* 服务详情条目 */
.svc{border:1px solid var(--hair);border-left:4px solid var(--red);background:#fff;padding:28px 32px;margin-bottom:22px}
.svc .tag{display:inline-block;background:var(--red);color:#fff;font-size:11.5px;letter-spacing:.2em;padding:3px 10px;margin-bottom:14px}
.svc-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-bottom:8px}
.svc-head h3{font-size:19.5px;font-weight:700;letter-spacing:.04em}
.svc-head .en{font-size:11px;color:#B4AC9F;letter-spacing:.14em}
.svc>p{font-size:14.5px;color:#4A4642;margin-bottom:14px}
.svc ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:0 30px}
.svc li{font-size:13.5px;color:#4A4642;padding:6px 0;border-top:1px dashed var(--hair)}
.svc li::before{content:"·";color:var(--red);font-weight:700;margin-right:8px}

/* 底部行动条 */
.cta{margin-top:84px;background:var(--red);color:#fff;padding:50px 0}
.cta .wrap{display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap}
.cta h3{font-size:22px;font-weight:700;letter-spacing:.05em}
.cta p{margin-top:8px;font-size:14.5px;color:#EFC9C5}
.cta .btn{display:inline-block;border:1px solid rgba(255,255,255,.7);padding:11px 36px;font-size:14.5px;letter-spacing:.12em;color:#fff;white-space:nowrap}
.cta .btn:hover{background:#fff;color:var(--red)}

/* FAQ 手风琴（与首页同款） */
.faq-list{border-top:1px solid var(--hair);border-left:1px solid var(--hair);border-right:1px solid var(--hair);max-width:1000px}
.faq-item{border-bottom:1px solid var(--hair);background:#fff}
.faq-item>summary{display:flex;align-items:flex-start;gap:16px;padding:22px 26px;cursor:pointer;list-style:none}
.faq-item>summary::-webkit-details-marker{display:none}
.faq-item>summary::marker{content:""}
.faq-n{font-family:Georgia,"Times New Roman",serif;font-size:13px;color:var(--red);font-weight:700;letter-spacing:.1em;padding-top:4px;min-width:26px;flex-shrink:0}
.faq-item>summary h3{font-size:16.5px;font-weight:700;color:var(--ink);flex:1;line-height:1.6;letter-spacing:.02em}
.faq-ic{width:16px;height:16px;position:relative;flex-shrink:0;margin-top:8px}
.faq-ic::before,.faq-ic::after{content:"";position:absolute;background:var(--red);transition:transform .25s ease}
.faq-ic::before{left:0;top:7px;width:16px;height:2px}
.faq-ic::after{left:7px;top:0;width:2px;height:16px}
.faq-item[open] .faq-ic::after{transform:scaleY(0)}
.faq-item>summary:hover{background:var(--sand)}
.faq-a{padding:0 26px 24px 68px;font-size:14.5px;line-height:1.95;color:#4A4642;max-width:960px}
.faq-a b{color:var(--red);font-weight:600}
.faq-a ul{list-style:none;margin:8px 0}
.faq-a ul li{position:relative;padding-left:18px}
.faq-a ul li::before{content:"·";position:absolute;left:2px;color:var(--red);font-weight:700}

@media(max-width:900px){
  .mast{height:64px}
  nav{display:none}
  .sec{padding-top:60px}
  .duo{grid-template-columns:1fr}
  .page-hero h1{font-size:25px}
  .page-hero .wrap{padding-top:42px;padding-bottom:40px}
  .cta .wrap{flex-direction:column;align-items:flex-start}
}
@media(max-width:700px){
  .kv-row{grid-template-columns:1fr}
  .kv-row dt{border-right:none;border-bottom:1px solid var(--hair);padding:12px 16px}
  .kv-row dd{padding:12px 16px}
  .svc{padding:22px 20px}
  .svc ul{grid-template-columns:1fr}
  .faq-item>summary{padding:18px 16px;gap:12px}
  .faq-item>summary h3{font-size:15.5px}
  .faq-a{padding:0 16px 20px 54px}
}