/* ==========================================================================
   逐梦国际官网 - style.css
   国际市场研究AI大模型与消费者洞察平台
   ========================================================================== */

:root{
  --c-bg:#FAF7F1;
  --c-bg-soft:#F1ECE0;
  --c-surface:#FFFFFF;
  --c-ink:#1C2430;
  --c-ink-soft:#4B5568;
  --c-ink-faint:#7A8194;
  --c-line:#E3DCC9;
  --c-line-soft:#ECE7D9;
  --c-blue:#163A5F;
  --c-blue-dark:#0F2740;
  --c-blue-soft:#E7EDF3;
  --c-cyan:#0C93A6;
  --c-cyan-soft:#E1F3F5;
  --c-green:#1E8F5E;
  --c-green-soft:#E4F4EC;
  --c-purple:#6E4FA3;
  --c-purple-soft:#EEE8F6;
  --c-amber:#B9791F;
  --c-amber-soft:#FAF0DD;
  --c-red:#B44634;
  --font-sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Helvetica,Arial,sans-serif;
  --radius-s:6px;
  --radius-m:12px;
  --radius-l:20px;
  --shadow-s:0 1px 2px rgba(28,36,48,.06);
  --shadow-m:0 6px 24px rgba(22,58,95,.08);
  --shadow-l:0 16px 48px rgba(22,58,95,.12);
  --maxw:1180px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--font-sans);
  background:var(--c-bg);
  color:var(--c-ink);
  line-height:1.8;
  font-size:16px;
  overflow-x:hidden;
}
img,svg{max-width:100%;display:block;height:auto;}
a{color:var(--c-blue);text-decoration:none;}
a:hover{color:var(--c-cyan);}
ul,ol{padding-left:1.3em;}
h1,h2,h3,h4{color:var(--c-blue-dark);line-height:1.4;margin:0 0 .6em;font-weight:700;}
p{margin:0 0 1em;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
.section{padding:64px 0;}
.section-tight{padding:40px 0;}
.section-alt{background:var(--c-bg-soft);}
.section-blue{background:linear-gradient(160deg,var(--c-blue) 0%,var(--c-blue-dark) 100%);color:#EFF3F7;}
.section-blue h2,.section-blue h3{color:#fff;}
.section-blue .muted{color:#C4D2E0;}

/* ---------- Typography helpers ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:.8rem;letter-spacing:.06em;font-weight:700;
  color:var(--c-cyan);text-transform:uppercase;margin-bottom:14px;
}
.h1-hero{font-size:clamp(1.7rem,3.4vw,2.6rem);}
h2{font-size:clamp(1.4rem,2.6vw,1.9rem);}
h3{font-size:1.2rem;}
.lede{font-size:1.08rem;color:var(--c-ink-soft);}
.muted{color:var(--c-ink-soft);}
.faint{color:var(--c-ink-faint);font-size:.9rem;}
.center{text-align:center;}
.narrow{max-width:760px;margin-left:auto;margin-right:auto;}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(250,247,241,.94);
  backdrop-filter:blur(6px);
  border-bottom:1px solid var(--c-line);
}
.nav-wrap{
  max-width:var(--maxw);margin:0 auto;padding:0 20px;
  display:flex;align-items:center;justify-content:space-between;
  height:66px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.08rem;color:var(--c-blue-dark);}
.brand img{width:34px;height:34px;}
.brand .brand-en{display:block;font-size:.68rem;font-weight:500;color:var(--c-ink-faint);letter-spacing:.03em;}
.nav-list{display:flex;gap:4px;list-style:none;margin:0;padding:0;}
.nav-list a{
  display:block;padding:10px 14px;border-radius:999px;
  font-size:.94rem;color:var(--c-ink);font-weight:500;
}
.nav-list a:hover,.nav-list a.active{background:var(--c-blue-soft);color:var(--c-blue);}
.nav-toggle{
  display:none;background:none;border:1px solid var(--c-line);border-radius:8px;
  width:42px;height:38px;cursor:pointer;position:relative;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:9px;right:9px;height:2px;background:var(--c-ink);
  transition:transform .2s ease,opacity .2s ease;
}
.nav-toggle span{top:18px;}
.nav-toggle span::before{top:-7px;}
.nav-toggle span::after{top:7px;}
.nav-toggle.is-open span{background:transparent;}
.nav-toggle.is-open span::before{transform:translateY(7px) rotate(45deg);}
.nav-toggle.is-open span::after{transform:translateY(-7px) rotate(-45deg);}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 22px;border-radius:999px;font-weight:600;font-size:.96rem;
  border:1px solid transparent;cursor:pointer;
}
.btn-primary{background:var(--c-blue);color:#fff;}
.btn-primary:hover{background:var(--c-blue-dark);color:#fff;}
.btn-ghost{background:transparent;border-color:var(--c-line);color:var(--c-ink);}
.btn-ghost:hover{border-color:var(--c-blue);color:var(--c-blue);}
.btn-cyan{background:var(--c-cyan);color:#fff;}
.btn-cyan:hover{background:#0b7c8c;color:#fff;}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px;}

/* ---------- Hero ---------- */
.hero{padding:56px 0 20px;}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;}
.hero-art{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--radius-l);padding:18px;box-shadow:var(--shadow-m);}

/* ---------- Cards / grids ---------- */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.card{
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--radius-m);
  padding:24px;box-shadow:var(--shadow-s);
}
.card h3{margin-bottom:10px;}
.card-icon{width:44px;height:44px;margin-bottom:14px;}

/* ---------- Badges / tags ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-size:.74rem;font-weight:700;padding:3px 10px;border-radius:999px;
  letter-spacing:.02em;
}
.badge-demo{background:var(--c-amber-soft);color:var(--c-amber);}
.badge-sim{background:var(--c-purple-soft);color:var(--c-purple);}
.badge-data{background:var(--c-cyan-soft);color:var(--c-cyan);}
.badge-plan{background:var(--c-green-soft);color:var(--c-green);}
.tag{
  display:inline-block;font-size:.78rem;color:var(--c-ink-soft);
  background:var(--c-bg-soft);border:1px solid var(--c-line);border-radius:6px;
  padding:2px 9px;margin:0 6px 6px 0;
}

/* ---------- Data chain ---------- */
.chain{display:flex;flex-wrap:wrap;align-items:center;gap:0;justify-content:center;margin:28px 0;}
.chain-node{
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:999px;
  padding:9px 18px;font-size:.86rem;font-weight:600;color:var(--c-blue);
  box-shadow:var(--shadow-s);
}
.chain-arrow{color:var(--c-ink-faint);padding:0 8px;font-size:1rem;}

/* ---------- Articles ---------- */
.article-feature{
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--radius-l);
  padding:36px;margin-bottom:34px;box-shadow:var(--shadow-m);
}
.article-feature .meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:14px;}
.article-feature .meta .cat{color:var(--c-cyan);font-weight:700;font-size:.82rem;}
.article-feature .meta .date{color:var(--c-ink-faint);font-size:.82rem;}
.article-feature h3{font-size:1.4rem;margin-bottom:16px;}
.article-body p{margin-bottom:1em;}
.article-body strong{color:var(--c-blue-dark);}
.article-figure{
  margin:22px 0;padding:16px;background:var(--c-bg-soft);border:1px solid var(--c-line-soft);
  border-radius:var(--radius-m);
}
.article-figure figcaption{font-size:.84rem;color:var(--c-ink-faint);margin-top:10px;text-align:center;}
.pull-note{
  border-left:3px solid var(--c-cyan);background:var(--c-cyan-soft);
  padding:14px 18px;border-radius:0 var(--radius-s) var(--radius-s) 0;margin:20px 0;font-size:.96rem;
}
.article-links{margin-top:18px;font-size:.9rem;}
.article-links a{margin-right:16px;}

.observe-card{
  background:var(--c-bg-soft);border:1px solid var(--c-line);border-radius:var(--radius-m);
  padding:24px;margin-bottom:18px;
}
.observe-card .meta{font-size:.8rem;color:var(--c-ink-faint);margin-bottom:8px;}

/* article summary rows used on homepage to link back to sub-pages */
.link-row{
  display:flex;gap:18px;padding:18px 0;border-bottom:1px solid var(--c-line-soft);
  align-items:flex-start;
}
.link-row:last-child{border-bottom:none;}
.link-row .idx{
  flex:0 0 auto;width:34px;height:34px;border-radius:50%;background:var(--c-blue-soft);
  color:var(--c-blue);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;
}
.link-row h4{margin:0 0 6px;font-size:1.02rem;}
.link-row .meta{font-size:.78rem;color:var(--c-ink-faint);margin-bottom:6px;}
.link-row p{margin:0;font-size:.92rem;color:var(--c-ink-soft);}

/* ---------- Table / matrix ---------- */
.table-scroll{overflow-x:auto;border:1px solid var(--c-line);border-radius:var(--radius-m);background:var(--c-surface);}
table{border-collapse:collapse;width:100%;min-width:560px;font-size:.9rem;}
table caption{text-align:left;padding:12px 16px;font-weight:700;color:var(--c-blue-dark);}
th,td{padding:11px 14px;border-bottom:1px solid var(--c-line-soft);text-align:left;vertical-align:top;}
thead th{background:var(--c-bg-soft);color:var(--c-blue-dark);font-size:.82rem;}
tbody tr:last-child td{border-bottom:none;}
tbody tr:hover{background:var(--c-bg-soft);}

/* ---------- Tabs ---------- */
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px;}
.tab-btn{
  background:var(--c-surface);border:1px solid var(--c-line);border-radius:999px;
  padding:8px 16px;font-size:.88rem;cursor:pointer;color:var(--c-ink-soft);font-weight:600;
}
.tab-btn.is-active{background:var(--c-blue);border-color:var(--c-blue);color:#fff;}
.tab-panel{display:none;}
.tab-panel.is-active{display:block;}

/* ---------- Matrix / positioning ---------- */
.matrix{position:relative;background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--radius-m);padding:20px;}

/* ---------- FAQ ---------- */
.faq-item{border-bottom:1px solid var(--c-line-soft);}
.faq-q{
  width:100%;text-align:left;background:none;border:none;cursor:pointer;
  padding:18px 4px;font-size:1rem;font-weight:600;color:var(--c-blue-dark);
  display:flex;justify-content:space-between;align-items:center;gap:12px;
}
.faq-q::after{content:"+";font-size:1.3rem;color:var(--c-cyan);flex:0 0 auto;transition:transform .2s;}
.faq-q[aria-expanded="true"]::after{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;font-size:.94rem;color:var(--c-ink-soft);}
.faq-a p{padding:0 4px 16px;margin:0;}

/* ---------- Assistant demo ---------- */
.assistant-demo{background:var(--c-blue-dark);border-radius:var(--radius-l);padding:24px;color:#EAF0F6;}
.assistant-q{
  display:block;width:100%;text-align:left;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);
  color:#EAF0F6;border-radius:var(--radius-m);padding:13px 16px;margin-bottom:10px;cursor:pointer;font-size:.92rem;
}
.assistant-q:hover{background:rgba(255,255,255,.12);}
.assistant-a{
  background:rgba(12,147,166,.14);border:1px solid rgba(12,147,166,.4);border-radius:var(--radius-m);
  padding:16px;margin:6px 0 18px;font-size:.9rem;display:none;
}
.assistant-a.is-open{display:block;}
.assistant-a .src{margin-top:10px;font-size:.78rem;color:#9FD9E1;}

/* ---------- Footer ---------- */
.site-footer{background:var(--c-blue-dark);color:#B9C6D4;padding:52px 0 26px;margin-top:60px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px;}
.site-footer h4{color:#EAF0F6;font-size:.92rem;margin-bottom:14px;}
.site-footer a{color:#B9C6D4;}
.site-footer a:hover{color:#fff;}
.site-footer ul{list-style:none;padding:0;margin:0;}
.site-footer li{margin-bottom:9px;font-size:.88rem;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:22px;font-size:.8rem;color:#8FA0B3;display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;}
.footer-disclaimer{font-size:.78rem;color:#7E90A4;line-height:1.7;margin-top:14px;}

/* ---------- Back to top ---------- */
.to-top{
  position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;
  background:var(--c-blue);color:#fff;border:none;cursor:pointer;display:none;
  align-items:center;justify-content:center;box-shadow:var(--shadow-l);z-index:60;font-size:1.1rem;
}
.to-top.is-visible{display:flex;}

/* ---------- Breadcrumb ---------- */
.breadcrumb{font-size:.82rem;color:var(--c-ink-faint);padding:14px 0;}
.breadcrumb a{color:var(--c-ink-faint);}
.breadcrumb a:hover{color:var(--c-blue);}

/* ---------- App download ---------- */
.download-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.download-card{background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--radius-m);padding:22px;text-align:center;}
.download-card img{width:56px;height:56px;margin:0 auto 12px;}

/* ---------- Utility ---------- */
.flow-list{list-style:none;padding:0;margin:0;}
.flow-list li{
  display:flex;gap:12px;align-items:flex-start;padding:10px 0;border-bottom:1px dashed var(--c-line);
}
.flow-list li:last-child{border-bottom:none;}
.flow-list .n{
  flex:0 0 auto;width:26px;height:26px;border-radius:50%;background:var(--c-cyan-soft);color:var(--c-cyan);
  display:flex;align-items:center;justify-content:center;font-size:.78rem;font-weight:700;
}
hr.rule{border:none;border-top:1px solid var(--c-line);margin:40px 0;}

/* ---------- Responsive ---------- */
@media (max-width:1024px){
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr;}
  .grid-3{grid-template-columns:1fr 1fr;}
  .download-grid{grid-template-columns:1fr;}
}
@media (max-width:768px){
  .nav-list{
    position:fixed;top:66px;left:0;right:0;bottom:0;background:var(--c-bg);
    flex-direction:column;padding:14px 20px;gap:2px;
    transform:translateY(-8px);opacity:0;pointer-events:none;transition:opacity .18s ease,transform .18s ease;
    overflow-y:auto;border-top:1px solid var(--c-line);
  }
  .nav-list.is-open{opacity:1;transform:translateY(0);pointer-events:auto;}
  .nav-list a{padding:13px 10px;border-radius:8px;font-size:1.02rem;}
  .nav-toggle{display:block;}
  .grid-2,.grid-3{grid-template-columns:1fr;}
  .article-feature{padding:22px;}
  .section{padding:44px 0;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px;}
}
@media (max-width:480px){
  .footer-grid{grid-template-columns:1fr;}
  .container{padding:0 16px;}
  .article-feature{padding:18px;border-radius:var(--radius-m);}
  .chain-node{font-size:.78rem;padding:7px 12px;}
}