/* ==========================================================================
   壹号国际官网 style.css
   国际采购AI大模型 / 全球供应商 / 智能询价 / 采购合同 / 供应商风险
   ========================================================================== */

:root{
  --c-bg:#FAF7F1;
  --c-bg-alt:#F1ECE1;
  --c-surface:#FFFFFF;
  --c-ink:#1D2430;
  --c-ink-soft:#4B5159;
  --c-ink-faint:#7A828C;
  --c-border:#E4DFD3;
  --c-border-soft:#EDE8DC;

  --c-navy:#16324F;
  --c-navy-deep:#0E2338;
  --c-navy-tint:#E7EDF2;

  --c-cyan:#238C87;
  --c-cyan-tint:#E4F2F0;
  --c-cyan-deep:#146360;

  --c-green:#3F8F5F;
  --c-green-tint:#E7F3EA;

  --c-orange:#D97F32;
  --c-orange-tint:#FBEEE0;
  --c-orange-deep:#A85B1E;

  --c-graphite:#4B5159;

  --radius-sm:6px;
  --radius-md:12px;
  --radius-lg:20px;

  --shadow-sm:0 1px 2px rgba(14,35,56,.06), 0 1px 1px rgba(14,35,56,.04);
  --shadow-md:0 8px 24px rgba(14,35,56,.08);
  --shadow-lg:0 16px 40px rgba(14,35,56,.12);

  --maxw:1180px;
  --font-cn: "PingFang SC","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--c-bg);
  color:var(--c-ink);
  font-family:var(--font-cn);
  line-height:1.75;
  font-size:16px;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;display:block;}
a{color:var(--c-cyan-deep);text-decoration:none;}
a:hover{text-decoration:underline;}
ul,ol{padding-left:1.3em;}
h1,h2,h3,h4{
  color:var(--c-navy-deep);
  line-height:1.35;
  margin:0 0 .6em;
  font-weight:700;
  letter-spacing:.01em;
}
p{margin:0 0 1em;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
section{position:relative;}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;}

/* ---------- Skip link ---------- */
.skip-link{position:absolute;left:-999px;top:0;background:var(--c-navy);color:#fff;padding:10px 16px;z-index:999;border-radius:0 0 8px 0;}
.skip-link:focus{left:0;}

/* ---------- Top bar ---------- */
.topbar{
  background:var(--c-navy-deep);
  color:#CBD8E2;
  font-size:12.5px;
}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:34px;gap:12px;}
.topbar-tags{display:flex;gap:14px;flex-wrap:wrap;}
.topbar-tags span{white-space:nowrap;}
@media(max-width:680px){.topbar-tags span:nth-child(n+3){display:none;}}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(250,247,241,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--c-border);
}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:72px;gap:16px;}
.brand{display:flex;align-items:center;gap:10px;color:var(--c-navy-deep);font-weight:800;font-size:19px;}
.brand .logo-mark{width:38px;height:38px;flex:none;}
.brand small{display:block;font-size:11px;font-weight:500;color:var(--c-ink-faint);letter-spacing:.04em;}

.main-nav{display:flex;align-items:center;gap:2px;}
.main-nav a{
  color:var(--c-ink-soft);
  font-weight:600;
  font-size:14.5px;
  padding:9px 14px;
  border-radius:999px;
  white-space:nowrap;
}
.main-nav a:hover{background:var(--c-navy-tint);color:var(--c-navy-deep);text-decoration:none;}
.main-nav a[aria-current="page"]{background:var(--c-navy);color:#fff;}

.nav-toggle{
  display:none;background:var(--c-navy);color:#fff;border:none;
  width:42px;height:42px;border-radius:10px;cursor:pointer;flex:none;
}
.nav-toggle span,.nav-toggle::before,.nav-toggle::after{
  content:"";display:block;width:20px;height:2px;background:#fff;margin:4px auto;border-radius:2px;
}

@media(max-width:960px){
  .main-nav{
    position:fixed;inset:72px 0 0 0;background:var(--c-bg);
    flex-direction:column;align-items:stretch;padding:18px;gap:6px;
    transform:translateX(100%);transition:transform .25s ease;overflow-y:auto;
  }
  .main-nav.is-open{transform:translateX(0);}
  .main-nav a{padding:14px 16px;font-size:16px;border-bottom:1px solid var(--c-border-soft);border-radius:8px;}
  .nav-toggle{display:block;}
}

/* ---------- Hero ---------- */
.hero{
  background:
    radial-gradient(1100px 480px at 82% -10%, rgba(35,140,135,.14), transparent 60%),
    radial-gradient(900px 420px at 8% 0%, rgba(22,50,79,.10), transparent 55%),
    var(--c-bg);
  padding:56px 0 44px;
  border-bottom:1px solid var(--c-border);
}
.hero .container{display:grid;grid-template-columns:1.08fr .92fr;gap:40px;align-items:center;}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--c-navy-tint);color:var(--c-navy);
  font-size:12.5px;font-weight:700;padding:6px 12px;border-radius:999px;margin-bottom:16px;
}
.hero h1{font-size:clamp(26px,3.4vw,38px);margin-bottom:16px;}
.hero .lead{font-size:16.5px;color:var(--c-ink-soft);max-width:56ch;}
.hero-actions{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap;}
.hero-figure{border-radius:var(--radius-lg);overflow:hidden;background:var(--c-surface);border:1px solid var(--c-border);box-shadow:var(--shadow-md);}
@media(max-width:900px){
  .hero .container{grid-template-columns:1fr;}
  .hero-figure{order:-1;}
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 22px;border-radius:999px;font-weight:700;font-size:14.5px;
  border:1px solid transparent;cursor:pointer;
}
.btn-primary{background:var(--c-navy);color:#fff;}
.btn-primary:hover{background:var(--c-navy-deep);text-decoration:none;}
.btn-outline{background:transparent;color:var(--c-navy);border-color:var(--c-navy);}
.btn-outline:hover{background:var(--c-navy-tint);text-decoration:none;}
.btn-cyan{background:var(--c-cyan);color:#fff;}
.btn-cyan:hover{background:var(--c-cyan-deep);text-decoration:none;}

/* ---------- Section headers ---------- */
.section-head{max-width:760px;margin:0 auto 34px;text-align:center;}
.section-head.align-left{text-align:left;margin:0 0 30px;}
.kicker{
  display:inline-block;color:var(--c-cyan-deep);font-weight:800;font-size:12.5px;
  letter-spacing:.08em;text-transform:uppercase;margin-bottom:10px;
}
.section-head h2{font-size:clamp(22px,2.6vw,30px);}
.section-head p{color:var(--c-ink-soft);}

section.band{padding:64px 0;}
section.band.alt{background:var(--c-surface);border-top:1px solid var(--c-border-soft);border-bottom:1px solid var(--c-border-soft);}
section.band.navy{background:var(--c-navy-deep);color:#DCE5EC;}
section.band.navy h2,section.band.navy h3{color:#fff;}
section.band.navy .kicker{color:#7FD3CC;}

/* ---------- Decision chain ---------- */
.chain-scroll{overflow-x:auto;padding-bottom:6px;-webkit-overflow-scrolling:touch;}
.chain{display:flex;gap:0;min-width:760px;list-style:none;margin:0;padding:0;}
.chain li{
  flex:1;text-align:center;font-size:12.5px;font-weight:700;color:var(--c-navy);
  padding:12px 6px;position:relative;
}
.chain li::after{
  content:"›";position:absolute;right:-2px;top:50%;transform:translateY(-50%);
  color:var(--c-ink-faint);font-size:16px;
}
.chain li:last-child::after{content:"";}
.chain li .n{
  display:block;width:30px;height:30px;line-height:30px;border-radius:50%;
  background:var(--c-navy-tint);color:var(--c-navy);font-size:12px;margin:0 auto 6px;
}

/* ---------- Article grid (homepage 8 features) ---------- */
.article-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px;}
@media(max-width:860px){.article-grid{grid-template-columns:1fr;}}

.feature-article{
  background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius-lg);
  padding:26px 26px 24px;box-shadow:var(--shadow-sm);
}
.feature-article .meta{display:flex;gap:10px;align-items:center;font-size:12.5px;color:var(--c-ink-faint);margin-bottom:12px;flex-wrap:wrap;}
.feature-article .tag{background:var(--c-cyan-tint);color:var(--c-cyan-deep);padding:3px 10px;border-radius:999px;font-weight:700;}
.feature-article h3{font-size:19px;margin-bottom:12px;}
.feature-article figure{margin:0 0 16px;border:1px solid var(--c-border-soft);border-radius:var(--radius-md);overflow:hidden;background:var(--c-bg-alt);}
.feature-article figcaption{font-size:12px;color:var(--c-ink-faint);padding:8px 12px;border-top:1px dashed var(--c-border);}
.feature-article .lede{font-weight:600;color:var(--c-ink);}
.feature-article .body-more{color:var(--c-ink-soft);}
.feature-article .insight{
  margin-top:14px;padding:12px 14px;background:var(--c-navy-tint);border-left:3px solid var(--c-navy);
  border-radius:0 8px 8px 0;font-size:14px;color:var(--c-navy-deep);
}
.feature-article .read-more{display:inline-block;margin-top:14px;font-weight:700;font-size:14px;}

/* ---------- Observation cards ---------- */
.observe-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
@media(max-width:900px){.observe-grid{grid-template-columns:1fr;}}
.observe-card{background:var(--c-bg-alt);border:1px solid var(--c-border);border-radius:var(--radius-md);padding:22px;}
.observe-card .meta{font-size:12px;color:var(--c-ink-faint);margin-bottom:8px;}
.observe-card h3{font-size:16.5px;margin-bottom:10px;}
.observe-card p{color:var(--c-ink-soft);font-size:14.5px;}

/* ---------- Summary rollup cards (secondary page previews on index) ---------- */
.hub-block{margin-bottom:44px;}
.hub-block-head{display:flex;justify-content:space-between;align-items:baseline;gap:14px;margin-bottom:18px;flex-wrap:wrap;}
.hub-block-head h3{font-size:20px;margin:0;}
.hub-block-head a{font-weight:700;font-size:14px;white-space:nowrap;}
.mini-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
@media(max-width:900px){.mini-grid{grid-template-columns:1fr 1fr;}}
@media(max-width:640px){.mini-grid{grid-template-columns:1fr;}}
.mini-card{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius-md);padding:18px;box-shadow:var(--shadow-sm);}
.mini-card .cat{font-size:11.5px;font-weight:700;color:var(--c-orange-deep);text-transform:uppercase;letter-spacing:.04em;}
.mini-card h4{font-size:15.5px;margin:8px 0 8px;}
.mini-card p{font-size:13.5px;color:var(--c-ink-soft);margin-bottom:10px;}
.mini-card a{font-size:13px;font-weight:700;}

/* App preview cards (bigger, with more preview text) */
.app-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
@media(max-width:760px){.app-grid{grid-template-columns:1fr;}}
.app-card{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius-md);padding:20px;box-shadow:var(--shadow-sm);}
.app-card .cat{font-size:11.5px;font-weight:700;color:var(--c-cyan-deep);}
.app-card h4{font-size:16px;margin:8px 0;}
.app-card p{font-size:14px;color:var(--c-ink-soft);}

/* ---------- Generic content article page ---------- */
.article-full{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius-lg);padding:30px clamp(18px,4vw,40px);margin-bottom:30px;box-shadow:var(--shadow-sm);}
.article-full .meta{font-size:13px;color:var(--c-ink-faint);margin-bottom:10px;}
.article-full h2{font-size:clamp(20px,2.4vw,26px);}
.article-full h3{font-size:17px;margin-top:1.6em;}
.article-full p{color:var(--c-ink-soft);}
.article-full figure{margin:20px 0;border:1px solid var(--c-border-soft);border-radius:var(--radius-md);overflow:hidden;background:var(--c-bg-alt);}
.article-full figcaption{font-size:12.5px;color:var(--c-ink-faint);padding:10px 14px;border-top:1px dashed var(--c-border);}
.callout{background:var(--c-orange-tint);border-left:3px solid var(--c-orange);padding:14px 16px;border-radius:0 8px 8px 0;margin:18px 0;font-size:14.5px;color:#6B4419;}
.callout.cyan{background:var(--c-cyan-tint);border-color:var(--c-cyan);color:var(--c-cyan-deep);}
.callout.navy{background:var(--c-navy-tint);border-color:var(--c-navy);color:var(--c-navy-deep);}

/* ---------- Tables (RFQ comparison etc.) ---------- */
.table-scroll{overflow-x:auto;border:1px solid var(--c-border);border-radius:var(--radius-md);margin:18px 0;-webkit-overflow-scrolling:touch;}
table.compare{width:100%;border-collapse:collapse;min-width:640px;font-size:14px;}
table.compare th,table.compare td{padding:11px 14px;border-bottom:1px solid var(--c-border-soft);text-align:left;white-space:nowrap;}
table.compare thead th{background:var(--c-navy-tint);color:var(--c-navy-deep);font-weight:700;position:sticky;top:0;}
table.compare tbody tr:last-child td{border-bottom:none;}
table.compare tbody tr:hover{background:var(--c-bg-alt);}
.flag-ok{color:var(--c-green);font-weight:700;}
.flag-warn{color:var(--c-orange-deep);font-weight:700;}

/* ---------- FAQ ---------- */
.faq-list{max-width:880px;margin:0 auto;border-top:1px solid var(--c-border);}
.faq-item{border-bottom:1px solid var(--c-border);}
.faq-q{
  width:100%;text-align:left;background:none;border:none;cursor:pointer;
  padding:18px 4px;font-size:15.5px;font-weight:700;color:var(--c-navy-deep);
  display:flex;justify-content:space-between;align-items:center;gap:14px;
  font-family:inherit;
}
.faq-q .icon{flex:none;width:22px;height:22px;position:relative;}
.faq-q .icon::before,.faq-q .icon::after{content:"";position:absolute;background:var(--c-navy);border-radius:2px;}
.faq-q .icon::before{width:14px;height:2px;top:10px;left:4px;}
.faq-q .icon::after{width:2px;height:14px;left:10px;top:4px;transition:transform .2s;}
.faq-item[data-open="true"] .icon::after{transform:scaleY(0);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;}
.faq-item[data-open="true"] .faq-a{max-height:400px;}
.faq-a p{padding:0 4px 18px;color:var(--c-ink-soft);font-size:14.5px;}

/* ---------- Timeline (contract obligations) ---------- */
.timeline{list-style:none;margin:0;padding:0;border-left:2px solid var(--c-border);}
.timeline li{position:relative;padding:0 0 26px 24px;}
.timeline li::before{content:"";position:absolute;left:-7px;top:2px;width:12px;height:12px;border-radius:50%;background:var(--c-cyan);border:2px solid var(--c-surface);}
.timeline .t-date{font-size:12.5px;font-weight:700;color:var(--c-cyan-deep);}
.timeline .t-title{font-weight:700;margin:2px 0 4px;color:var(--c-navy-deep);}
.timeline .t-desc{font-size:14px;color:var(--c-ink-soft);}

/* ---------- Tabs (interactive demo blocks) ---------- */
.tabs{border:1px solid var(--c-border);border-radius:var(--radius-md);overflow:hidden;background:var(--c-surface);}
.tab-btns{display:flex;flex-wrap:wrap;border-bottom:1px solid var(--c-border);background:var(--c-bg-alt);}
.tab-btns button{
  flex:1;min-width:120px;padding:12px 10px;background:none;border:none;cursor:pointer;
  font-family:inherit;font-weight:700;font-size:13.5px;color:var(--c-ink-soft);border-bottom:2px solid transparent;
}
.tab-btns button[aria-selected="true"]{color:var(--c-navy-deep);border-bottom-color:var(--c-navy);background:var(--c-surface);}
.tab-panel{display:none;padding:20px;}
.tab-panel.is-active{display:block;}

/* ---------- Stat / dashboard tiles (app page) ---------- */
.tile-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
@media(max-width:760px){.tile-grid{grid-template-columns:1fr 1fr;}}
.tile{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius-md);padding:16px;text-align:center;}
.tile .num{font-size:22px;font-weight:800;color:var(--c-navy-deep);}
.tile .lbl{font-size:12.5px;color:var(--c-ink-faint);margin-top:4px;}

/* ---------- Definition grid (RFQ/RFP/RFI etc.) ---------- */
.def-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
@media(max-width:820px){.def-grid{grid-template-columns:1fr;}}
.def-card{border:1px solid var(--c-border);border-radius:var(--radius-md);padding:18px;background:var(--c-surface);}
.def-card .abbr{font-size:22px;font-weight:800;color:var(--c-cyan-deep);}
.def-card h4{font-size:15px;margin:6px 0 8px;}
.def-card p{font-size:13.5px;color:var(--c-ink-soft);margin:0;}

/* ---------- Badge list ---------- */
.badge-row{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0;}
.badge{background:var(--c-bg-alt);border:1px solid var(--c-border);color:var(--c-ink-soft);font-size:12.5px;padding:5px 12px;border-radius:999px;}

/* ---------- Status pill (AI page) ---------- */
.status-row{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0;}
.status-pill{font-size:12.5px;font-weight:700;padding:6px 13px;border-radius:999px;border:1px solid var(--c-border);}
.status-pill.s-research{background:var(--c-navy-tint);color:var(--c-navy-deep);}
.status-pill.s-compare{background:var(--c-cyan-tint);color:var(--c-cyan-deep);}
.status-pill.s-recommend{background:var(--c-green-tint);color:var(--c-green);}
.status-pill.s-pending{background:var(--c-orange-tint);color:var(--c-orange-deep);}
.status-pill.s-approved{background:#16324F;color:#fff;}
.status-pill.s-executed{background:var(--c-graphite);color:#fff;}

/* ---------- Assistant Q&A block ---------- */
.assistant-box{background:var(--c-navy-deep);border-radius:var(--radius-lg);padding:26px clamp(18px,4vw,34px);color:#DCE5EC;}
.assistant-box h3{color:#fff;}
.assistant-q{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius-md);padding:14px 16px;margin-bottom:12px;font-size:14.5px;}
.assistant-q b{color:#7FD3CC;display:block;font-size:12px;margin-bottom:4px;letter-spacing:.03em;}

/* ---------- Company / about ---------- */
.about-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:34px;align-items:start;}
@media(max-width:860px){.about-grid{grid-template-columns:1fr;}}
.fact-list{list-style:none;margin:0;padding:0;border:1px solid var(--c-border);border-radius:var(--radius-md);overflow:hidden;background:var(--c-surface);}
.fact-list li{display:flex;justify-content:space-between;gap:14px;padding:12px 16px;border-bottom:1px solid var(--c-border-soft);font-size:14px;}
.fact-list li:last-child{border-bottom:none;}
.fact-list b{color:var(--c-ink-faint);font-weight:600;}
.fact-list span{color:var(--c-navy-deep);font-weight:700;text-align:right;}

/* ---------- Disclaimer ---------- */
.disclaimer{font-size:12.5px;color:var(--c-ink-faint);background:var(--c-bg-alt);border:1px dashed var(--c-border);border-radius:var(--radius-md);padding:14px 16px;}

/* ---------- Footer ---------- */
.site-footer{background:var(--c-navy-deep);color:#B9C6D1;padding:52px 0 26px;font-size:13.5px;}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:28px;}
@media(max-width:860px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media(max-width:520px){.footer-grid{grid-template-columns:1fr;}}
.footer-grid h5{color:#fff;font-size:13.5px;margin:0 0 12px;letter-spacing:.03em;}
.footer-grid ul{list-style:none;margin:0;padding:0;}
.footer-grid li{margin-bottom:8px;}
.footer-grid a{color:#B9C6D1;}
.footer-grid a:hover{color:#fff;}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:17px;margin-bottom:10px;}
.footer-brand .logo-mark{width:30px;height:30px;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:20px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:#8FA0AE;font-size:12px;}
.beian{color:#8FA0AE;}

.back-top{
  position:fixed;right:18px;bottom:22px;width:46px;height:46px;border-radius:50%;
  background:var(--c-navy);color:#fff;border:none;cursor:pointer;box-shadow:var(--shadow-lg);
  display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .2s;z-index:50;
}
.back-top.is-visible{opacity:1;pointer-events:auto;}

/* ---------- Breadcrumb ---------- */
.breadcrumb{font-size:13px;color:var(--c-ink-faint);padding:16px 0 0;}
.breadcrumb a{color:var(--c-ink-faint);}
.breadcrumb span{margin:0 6px;}

/* ---------- Utility ---------- */
.mt-0{margin-top:0;}
.text-center{text-align:center;}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
@media(max-width:760px){.grid-2{grid-template-columns:1fr;}}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
@media(max-width:820px){.grid-3{grid-template-columns:1fr;}}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
@media(max-width:900px){.grid-4{grid-template-columns:1fr 1fr;}}
@media(max-width:520px){.grid-4{grid-template-columns:1fr;}}

.step-card{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius-md);padding:18px;}
.step-card .num{width:28px;height:28px;border-radius:50%;background:var(--c-navy);color:#fff;font-size:12.5px;font-weight:700;display:flex;align-items:center;justify-content:center;margin-bottom:10px;}
.step-card h4{font-size:14.5px;margin:0 0 6px;}
.step-card p{font-size:13px;color:var(--c-ink-soft);margin:0;}