/* ===========================================================
   壹号国际官网 style.css
   国际制造业AI大模型 / 全球工厂自动化 / 工业机器人 / 数字孪生
   =========================================================== */

:root{
  --c-warm-white:#F7F4ED;
  --c-paper:#FFFFFF;
  --c-ink:#1B2430;
  --c-ink-soft:#4A5360;
  --c-blue:#102A47;
  --c-blue-dark:#0B1D33;
  --c-blue-50:#EAF0F6;
  --c-blue-100:#D6E2ED;
  --c-cyan:#159E96;
  --c-cyan-dark:#0F776F;
  --c-cyan-50:#E7F6F4;
  --c-green:#2E9E5B;
  --c-green-50:#E9F6EE;
  --c-graphite:#565F69;
  --c-graphite-50:#EEF0F2;
  --c-orange:#E17A33;
  --c-orange-50:#FCEEE1;
  --c-line:#E4DFD3;
  --c-line-soft:#EDE9DD;
  --radius-s:8px;
  --radius-m:14px;
  --radius-l:22px;
  --shadow-card:0 2px 4px rgba(16,42,71,.04), 0 10px 24px -14px rgba(16,42,71,.18);
  --shadow-card-hover:0 6px 14px -4px rgba(16,42,71,.16), 0 20px 40px -20px rgba(16,42,71,.26);
  --max-w:1180px;
  --font-sans:"PingFang SC","Microsoft YaHei","Segoe UI",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-sans);
  color:var(--c-ink);
  background:var(--c-warm-white);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul,ol{margin:0;padding:0;}
h1,h2,h3,h4,p{margin:0;}
button{font-family:inherit;cursor:pointer;}
.container{max-width:var(--max-w);margin:0 auto;padding:0 20px;}

/* ---------------- 顶部导航 ---------------- */
.site-header{
  position:sticky;top:0;z-index:40;
  background:rgba(247,244,237,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--c-line);
}
.nav-wrap{
  display:flex;align-items:center;justify-content:space-between;
  max-width:var(--max-w);margin:0 auto;padding:14px 20px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;color:var(--c-blue);}
.brand img{width:34px;height:34px;}
.brand-sub{font-size:11px;font-weight:400;color:var(--c-ink-soft);display:block;letter-spacing:.02em;}
.brand-text{display:flex;flex-direction:column;line-height:1.2;}

.main-nav{display:flex;gap:2px;align-items:center;}
.main-nav a{
  padding:9px 14px;border-radius:999px;font-size:14.5px;color:var(--c-ink-soft);
  transition:background .15s,color .15s;white-space:nowrap;
}
.main-nav a:hover,.main-nav a.active{background:var(--c-blue);color:#fff;}

.nav-toggle{
  display:none;width:40px;height:40px;border:1px solid var(--c-line);border-radius:var(--radius-s);
  background:var(--c-paper);align-items:center;justify-content:center;flex-shrink:0;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:18px;height:2px;background:var(--c-blue);position:relative;
  transition:transform .2s;
}
.nav-toggle span::before{position:absolute;top:-6px;}
.nav-toggle span::after{position:absolute;top:6px;}

/* ---------------- Hero ---------------- */
.hero{
  background:linear-gradient(160deg,var(--c-blue) 0%,var(--c-blue-dark) 62%,#0A1728 100%);
  color:#fff;padding:56px 0 64px;position:relative;overflow:hidden;
}
.hero-grid{
  display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center;
  max-width:var(--max-w);margin:0 auto;padding:0 20px;position:relative;z-index:2;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:.04em;
  color:var(--c-cyan);background:rgba(21,158,150,.14);border:1px solid rgba(21,158,150,.4);
  padding:6px 14px;border-radius:999px;margin-bottom:18px;
}
.hero h1{font-size:clamp(26px,3.6vw,40px);line-height:1.35;font-weight:700;margin-bottom:18px;}
.hero p.lead{font-size:16px;color:#C9D3DE;max-width:56ch;margin-bottom:26px;}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px;}
.hero-tags span{
  font-size:12.5px;color:#DCE4EC;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);
  padding:5px 11px;border-radius:999px;
}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;}
.hero-visual{position:relative;}
.hero-visual img{width:100%;height:auto;}

.btn{
  display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;
  font-size:14.5px;font-weight:600;border:1px solid transparent;transition:transform .15s,box-shadow .15s,background .15s;
}
.btn:hover{transform:translateY(-1px);}
.btn-primary{background:var(--c-cyan);color:#04211E;}
.btn-primary:hover{background:#1CB1A8;box-shadow:0 8px 20px -8px rgba(21,158,150,.6);}
.btn-outline{border-color:rgba(255,255,255,.35);color:#fff;}
.btn-outline:hover{background:rgba(255,255,255,.08);}
.btn-dark{background:var(--c-blue);color:#fff;}
.btn-dark:hover{background:var(--c-blue-dark);}

/* ---------------- Sections ---------------- */
section{padding:54px 0;}
.section-tight{padding:34px 0;}
.section-head{max-width:720px;margin-bottom:34px;}
.section-tag{
  display:inline-block;font-size:12.5px;color:var(--c-cyan-dark);background:var(--c-cyan-50);
  padding:5px 12px;border-radius:999px;margin-bottom:12px;font-weight:600;letter-spacing:.02em;
}
.section-head h2{font-size:clamp(22px,2.6vw,30px);line-height:1.4;color:var(--c-blue);font-weight:700;}
.section-head p{color:var(--c-ink-soft);margin-top:10px;font-size:15px;}
.section-alt{background:var(--c-paper);border-top:1px solid var(--c-line-soft);border-bottom:1px solid var(--c-line-soft);}
.section-blue{background:var(--c-blue);color:#fff;}
.section-blue .section-head h2{color:#fff;}
.section-blue .section-head p{color:#B9C4D0;}

/* ---------------- 制造链 / 架构图 ---------------- */
.chain-figure{
  background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--radius-l);
  padding:26px;box-shadow:var(--shadow-card);
}
.chain-figure figcaption{
  margin-top:14px;font-size:13.5px;color:var(--c-ink-soft);text-align:center;line-height:1.6;
}

/* ---------------- Flagship articles (index 8篇) ---------------- */
.flagship{
  display:grid;grid-template-columns:1fr 1fr;gap:0;
  background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--radius-l);
  overflow:hidden;margin-bottom:28px;box-shadow:var(--shadow-card);
}
.flagship:nth-child(even) .flagship-media{order:2;}
.flagship-media{background:var(--c-blue-50);display:flex;align-items:center;justify-content:center;padding:28px;}
.flagship-media img{width:100%;height:auto;}
.flagship-body{padding:32px 34px;}
.flagship-meta{display:flex;gap:10px;align-items:center;font-size:12.5px;color:var(--c-ink-soft);margin-bottom:12px;}
.flagship-meta .cat{
  color:var(--c-cyan-dark);background:var(--c-cyan-50);padding:3px 10px;border-radius:999px;font-weight:600;
}
.flagship-body h3{font-size:20px;line-height:1.5;color:var(--c-blue);font-weight:700;margin-bottom:14px;}
.flagship-body .excerpt p{margin-bottom:13px;color:var(--c-ink-soft);font-size:14.8px;}
.flagship-body .full{display:none;}
.flagship-body .full.is-open{display:block;}
.flagship-body .full p{margin-bottom:13px;color:var(--c-ink-soft);font-size:14.8px;}
.flagship-body .full h4{color:var(--c-blue);font-size:15.5px;margin:18px 0 8px;font-weight:700;}
.read-more-btn{
  margin-top:6px;display:inline-flex;align-items:center;gap:6px;background:none;border:none;
  color:var(--c-cyan-dark);font-weight:600;font-size:14px;padding:6px 0;
}
.read-more-btn::after{content:"▾";font-size:11px;transition:transform .2s;}
.read-more-btn.is-open::after{transform:rotate(180deg);}
.flagship-figure{margin:16px 0;text-align:center;}
.flagship-figure img{width:100%;max-width:520px;margin:0 auto;}
.flagship-figure figcaption{font-size:12.5px;color:var(--c-ink-soft);margin-top:8px;}

@media (max-width:860px){
  .flagship{grid-template-columns:1fr;}
  .flagship:nth-child(even) .flagship-media{order:0;}
}

/* ---------------- 官网观察 3篇 ---------------- */
.observe-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.observe-card{
  background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--radius-m);
  padding:24px;box-shadow:var(--shadow-card);
}
.observe-card .tag{
  font-size:12px;color:var(--c-orange);background:var(--c-orange-50);padding:3px 10px;border-radius:999px;
  font-weight:600;display:inline-block;margin-bottom:12px;
}
.observe-card h3{font-size:16.5px;color:var(--c-blue);line-height:1.55;margin-bottom:12px;font-weight:700;}
.observe-card p{font-size:14px;color:var(--c-ink-soft);margin-bottom:10px;}
@media (max-width:900px){.observe-grid{grid-template-columns:1fr;}}

/* ---------------- 卡片网格 / 二级页面摘要 ---------------- */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.card-grid.cols-2{grid-template-columns:repeat(2,1fr);}
.card-grid.cols-4{grid-template-columns:repeat(4,1fr);}
.mini-card{
  background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--radius-m);
  padding:22px;box-shadow:var(--shadow-card);transition:box-shadow .15s,transform .15s;
}
.mini-card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-2px);}
.mini-card .icon{width:40px;height:40px;margin-bottom:14px;}
.mini-card h3,.mini-card h4{font-size:15.5px;color:var(--c-blue);margin-bottom:10px;font-weight:700;line-height:1.5;}
.mini-card p{font-size:13.8px;color:var(--c-ink-soft);}
.mini-card .meta{font-size:12px;color:var(--c-graphite);margin-bottom:8px;}
@media (max-width:960px){
  .card-grid{grid-template-columns:repeat(2,1fr);}
  .card-grid.cols-4{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:640px){
  .card-grid,.card-grid.cols-2,.card-grid.cols-4{grid-template-columns:1fr;}
}

/* ---------------- 内部链接条 ---------------- */
.link-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:14px;}
.link-chip{
  display:inline-flex;align-items:center;gap:8px;background:var(--c-blue-50);color:var(--c-blue);
  border-radius:999px;padding:9px 16px;font-size:13.6px;font-weight:600;border:1px solid var(--c-blue-100);
}
.link-chip:hover{background:var(--c-blue);color:#fff;}

/* ---------------- 概念解释 / 定义列表 ---------------- */
.concept-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;}
.concept-item{
  background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--radius-m);padding:20px 22px;
}
.concept-item h4{color:var(--c-blue);font-size:15px;margin-bottom:8px;font-weight:700;}
.concept-item p{font-size:13.8px;color:var(--c-ink-soft);}
@media (max-width:760px){.concept-grid{grid-template-columns:1fr;}}

/* ---------------- 长文章（二级页面） ---------------- */
.article-block{
  background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--radius-l);
  padding:32px 34px;margin-bottom:24px;box-shadow:var(--shadow-card);
}
.article-block .meta{font-size:12.5px;color:var(--c-ink-soft);margin-bottom:10px;display:flex;gap:10px;align-items:center;}
.article-block .meta .cat{color:var(--c-green);background:var(--c-green-50);padding:3px 10px;border-radius:999px;font-weight:600;}
.article-block h3{font-size:21px;color:var(--c-blue);line-height:1.5;margin-bottom:16px;font-weight:700;}
.article-block p{margin-bottom:14px;color:var(--c-ink-soft);font-size:15px;}
.article-block h4{color:var(--c-blue);font-size:16px;margin:20px 0 10px;font-weight:700;}
.article-block .fig{margin:18px 0;text-align:center;}
.article-block .fig img{max-width:560px;margin:0 auto;}
.article-block .fig figcaption{font-size:12.5px;color:var(--c-ink-soft);margin-top:8px;}
.article-block ul{margin:10px 0 14px 20px;}
.article-block li{font-size:14.6px;color:var(--c-ink-soft);margin-bottom:6px;list-style:disc;}

/* ---------------- FAQ ---------------- */
.faq-list{border-top:1px solid var(--c-line);}
.faq-item{border-bottom:1px solid var(--c-line);}
.faq-q{
  width:100%;text-align:left;background:none;border:none;padding:18px 4px;display:flex;
  align-items:center;justify-content:space-between;gap:14px;font-size:15.2px;font-weight:600;color:var(--c-blue);
}
.faq-q::after{content:"+";font-size:20px;color:var(--c-cyan-dark);font-weight:400;flex-shrink:0;}
.faq-q.is-open::after{content:"−";}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;padding:0 4px;}
.faq-a p{padding-bottom:16px;color:var(--c-ink-soft);font-size:14.2px;}

/* ---------------- 交互演示区块 ---------------- */
.demo-box{
  background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--radius-l);
  padding:26px;box-shadow:var(--shadow-card);
}
.demo-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px;}
.demo-tab{
  padding:8px 16px;border-radius:999px;border:1px solid var(--c-line);background:var(--c-warm-white);
  font-size:13.5px;color:var(--c-ink-soft);font-weight:600;
}
.demo-tab.active{background:var(--c-blue);color:#fff;border-color:var(--c-blue);}
.demo-panel{display:none;}
.demo-panel.active{display:block;}
.bar-row{display:flex;align-items:center;gap:12px;margin-bottom:12px;}
.bar-label{width:110px;flex-shrink:0;font-size:13.5px;color:var(--c-ink-soft);}
.bar-track{flex:1;height:14px;background:var(--c-graphite-50);border-radius:999px;overflow:hidden;}
.bar-fill{height:100%;border-radius:999px;transition:width .4s ease;}
.bar-value{width:52px;text-align:right;font-size:13.5px;color:var(--c-blue);font-weight:700;flex-shrink:0;}
.demo-note{font-size:13.2px;color:var(--c-ink-soft);margin-top:10px;background:var(--c-blue-50);padding:12px 14px;border-radius:var(--radius-s);}

.stage-row{display:flex;gap:0;overflow-x:auto;padding-bottom:8px;}
.stage{
  flex:0 0 auto;min-width:120px;text-align:center;padding:14px 10px;border-right:1px dashed var(--c-line);
}
.stage:last-child{border-right:none;}
.stage .n{font-size:22px;font-weight:700;color:var(--c-blue);}
.stage .l{font-size:12.5px;color:var(--c-ink-soft);margin-top:4px;}
.stage.hot .n{color:var(--c-orange);}

/* ---------------- 助手对话演示 ---------------- */
.assistant-demo{display:grid;grid-template-columns:280px 1fr;gap:0;border:1px solid var(--c-line);border-radius:var(--radius-l);overflow:hidden;background:var(--c-paper);box-shadow:var(--shadow-card);}
.assistant-qlist{background:var(--c-blue-50);padding:18px;border-right:1px solid var(--c-line);}
.assistant-qlist button{
  display:block;width:100%;text-align:left;background:var(--c-paper);border:1px solid var(--c-line);
  border-radius:var(--radius-s);padding:11px 13px;font-size:13.2px;color:var(--c-ink);margin-bottom:9px;
}
.assistant-qlist button.active{border-color:var(--c-cyan);background:var(--c-cyan-50);color:var(--c-cyan-dark);font-weight:600;}
.assistant-answer{padding:26px 28px;}
.assistant-answer .q{font-size:15px;font-weight:700;color:var(--c-blue);margin-bottom:14px;}
.assistant-answer .steps{display:flex;flex-direction:column;gap:0;}
.assistant-answer .step{display:flex;gap:12px;padding:9px 0;border-bottom:1px dashed var(--c-line);font-size:13.6px;color:var(--c-ink-soft);}
.assistant-answer .step:last-child{border-bottom:none;}
.assistant-answer .step b{color:var(--c-blue);flex-shrink:0;min-width:78px;}
.assistant-answer .verdict{
  margin-top:14px;font-size:13.2px;padding:12px 14px;border-radius:var(--radius-s);
}
.verdict.review{background:var(--c-orange-50);color:#8A4A18;}
.verdict.ok{background:var(--c-green-50);color:#1E6B3E;}
@media (max-width:760px){.assistant-demo{grid-template-columns:1fr;}.assistant-qlist{border-right:none;border-bottom:1px solid var(--c-line);}}

/* ---------------- App 功能网格 ---------------- */
.app-feature{
  display:flex;gap:16px;background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--radius-m);
  padding:20px;box-shadow:var(--shadow-card);
}
.app-feature .icon{width:44px;height:44px;flex-shrink:0;}
.app-feature h4{color:var(--c-blue);font-size:15px;margin-bottom:6px;font-weight:700;}
.app-feature p{font-size:13.5px;color:var(--c-ink-soft);}

.app-download{
  display:flex;gap:16px;flex-wrap:wrap;
}
.download-card{
  flex:1;min-width:220px;background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--radius-m);
  padding:22px;text-align:center;box-shadow:var(--shadow-card);
}
.download-card img{width:52px;height:52px;margin:0 auto 12px;}
.download-card h4{color:var(--c-blue);font-size:15px;margin-bottom:8px;font-weight:700;}
.download-card p{font-size:12.8px;color:var(--c-ink-soft);margin-bottom:14px;}
.download-card .status{
  display:inline-block;font-size:12px;color:var(--c-graphite);background:var(--c-graphite-50);
  padding:4px 12px;border-radius:999px;
}

/* ---------------- 免责 / 说明条 ---------------- */
.notice{
  background:var(--c-orange-50);border:1px solid #F0D2B0;border-radius:var(--radius-m);
  padding:16px 20px;font-size:13.4px;color:#8A4A18;line-height:1.7;
}
.notice-blue{background:var(--c-blue-50);border-color:var(--c-blue-100);color:var(--c-blue);}

/* ---------------- 公司介绍 ---------------- */
.about-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:32px;align-items:start;}
.about-grid p{color:var(--c-ink-soft);font-size:15px;margin-bottom:14px;}
.about-fact{background:var(--c-paper);border:1px solid var(--c-line);border-radius:var(--radius-m);padding:22px;margin-bottom:14px;}
.about-fact dt{font-size:12.5px;color:var(--c-graphite);margin-bottom:4px;}
.about-fact dd{font-size:14.5px;color:var(--c-blue);font-weight:700;margin:0 0 12px;}
.about-fact dd:last-child{margin-bottom:0;}
@media (max-width:860px){.about-grid{grid-template-columns:1fr;}}

/* ---------------- Footer ---------------- */
.site-footer{background:var(--c-blue-dark);color:#B9C4D0;padding:46px 0 24px;margin-top:40px;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:28px;margin-bottom:30px;}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:12px;}
.footer-brand img{width:30px;height:30px;}
.footer-brand span{color:#fff;font-weight:700;font-size:17px;}
.footer-grid p{font-size:13px;color:#8CA0B3;line-height:1.8;}
.footer-col h5{color:#fff;font-size:13.5px;margin-bottom:14px;font-weight:600;}
.footer-col a{display:block;font-size:13px;color:#B9C4D0;margin-bottom:10px;}
.footer-col a:hover{color:#fff;}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding-top:20px;font-size:12.3px;color:#7C8FA1;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;line-height:1.8;
}
.footer-legal{max-width:900px;}
@media (max-width:900px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.footer-grid{grid-template-columns:1fr;}}

/* ---------------- 面包屑 ---------------- */
.breadcrumb{font-size:13px;color:var(--c-ink-soft);padding:16px 0;}
.breadcrumb a{color:var(--c-cyan-dark);}
.breadcrumb span{margin:0 6px;color:var(--c-line);}

/* ---------------- 页面 Hero（二级页） ---------------- */
.page-hero{
  background:linear-gradient(160deg,var(--c-blue) 0%,var(--c-blue-dark) 100%);color:#fff;padding:44px 0 50px;
}
.page-hero h1{font-size:clamp(24px,3vw,34px);margin-bottom:14px;font-weight:700;}
.page-hero p{color:#C9D3DE;max-width:64ch;font-size:15.5px;}
.page-hero .hero-tags{margin-top:18px;}

/* ---------------- 返回顶部 ---------------- */
.back-top{
  position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:50%;
  background:var(--c-blue);color:#fff;border:none;display:none;align-items:center;justify-content:center;
  box-shadow:0 6px 18px -4px rgba(16,42,71,.4);z-index:50;font-size:18px;
}
.back-top.show{display:flex;}

/* ---------------- 工具类 ---------------- */
.mt-0{margin-top:0;}
.text-center{text-align:center;}
.small{font-size:12.8px;color:var(--c-ink-soft);}

/* ---------------- 移动端 ---------------- */
@media (max-width:860px){
  .main-nav{
    position:fixed;top:63px;left:0;right:0;bottom:0;background:var(--c-warm-white);
    flex-direction:column;align-items:stretch;padding:16px 20px;gap:6px;overflow-y:auto;
    transform:translateX(100%);transition:transform .22s ease;z-index:39;
  }
  .main-nav.open{transform:translateX(0);}
  .main-nav a{padding:14px 16px;font-size:16px;border-radius:var(--radius-s);}
  .nav-toggle{display:flex;}
  .hero-grid{grid-template-columns:1fr;}
  .hero-visual{order:-1;max-width:320px;margin:0 auto 10px;}
}