:root{--bg:#f6f8ff;--bg2:#eef2fd;--panel:#ffffff;--panel2:#f3f6ff;--line:#e3e9f7;
--ink:#14172b;--muted:#5b6275;--brand:#4d6bfe;--brand2:#2f55eb;--gold:#8fa7ff;--cyan:#38bdf8;
--brand-grad:linear-gradient(135deg,#4d6bfe,#2f55eb);
--sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
--shadow:0 14px 44px rgba(45,80,220,.12)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.8;font-size:16px}
a{color:var(--brand2);text-decoration:none}
a:hover{text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
h1,h2,h3{line-height:1.3;color:var(--ink);font-weight:700}
.kicker{display:inline-flex;align-items:center;gap:10px;color:var(--brand);font-size:13px;font-weight:700;letter-spacing:.08em;margin-bottom:14px}
.kicker::before{content:"";width:22px;height:2px;background:var(--brand);border-radius:2px}
.sec{padding:84px 0}
.sec.alt{background:var(--bg2)}
.sec-head{max-width:720px;margin:0 auto 48px;text-align:center}
.sec-head h2{font-size:34px;margin-bottom:14px}
.sec-head p{color:var(--muted);font-size:16px}

/* 顶部导航 */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.82);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--ink);letter-spacing:-.01em}
.logo img{width:32px;height:32px;object-fit:contain}
.logo small{font-weight:500;color:var(--muted);font-size:12px;letter-spacing:.04em;margin-left:2px}
.nav-links{display:flex;gap:4px;align-items:center;list-style:none}
.nav-links > li{position:relative}
.nav-links > li > a{display:flex;align-items:center;gap:6px;padding:9px 14px;color:var(--ink);font-size:15px;font-weight:500;border-radius:9px}
.nav-links > li > a:hover{color:var(--brand);background:var(--panel2)}
.nav-links a.cta{background:var(--brand-grad);color:#fff;padding:9px 20px;border-radius:999px;font-weight:700;box-shadow:0 6px 18px rgba(45,80,220,.25)}
.nav-links a.cta:hover{transform:translateY(-1px);color:#fff;background:var(--brand-grad)}
.caret{font-size:9px;color:var(--muted);margin-top:1px}
.dropdown{position:absolute;top:100%;left:0;min-width:210px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:8px;opacity:0;visibility:hidden;transform:translateY(8px);transition:.18s;z-index:60}
.nav-links > li:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:block;padding:9px 14px;color:var(--ink);font-size:14px;border-radius:8px}
.dropdown a:hover{background:var(--panel2);color:var(--brand)}

/* hero:搜索框 + 深搜结果演示 */
.hero{position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;min-height:78vh;background:
  radial-gradient(60% 90% at 50% -10%,rgba(77,107,254,.16),transparent 60%),
  linear-gradient(180deg,#ffffff,#f6f8ff)}
.hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(77,107,254,.08) 1px,transparent 1px);background-size:26px 26px;mask-image:radial-gradient(60% 60% at 50% 0%,#000 40%,transparent 100%)}
.hero-inner{position:relative;max-width:860px;margin:0 auto;text-align:center;padding:56px 24px}
.hero h1{font-size:60px;margin:0 0 14px;letter-spacing:-.02em}
.hero .subtitle{color:var(--muted);font-size:20px;margin-bottom:36px}
.hero .subtitle b{color:var(--brand);font-weight:700}
.hero .lead{color:var(--muted);font-size:16px;max-width:660px;margin:0 auto 32px;line-height:1.95}
.searchbox{display:flex;align-items:center;gap:8px;max-width:640px;margin:0 auto 22px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:8px 8px 8px 20px;box-shadow:var(--shadow)}
.searchbox-input{flex:1;border:none;outline:none;background:transparent;font-size:16px;color:var(--ink);font-family:var(--sans);min-width:0}
.searchbox-input::placeholder{color:#a7aec6}
.searchbox-btn{flex-shrink:0;border:none;cursor:pointer;background:var(--brand-grad);color:#fff;font-size:15px;font-weight:700;padding:12px 24px;border-radius:11px;font-family:var(--sans);box-shadow:0 6px 16px rgba(45,80,220,.28)}
.searchbox-btn:hover{filter:brightness(1.05)}
.demo{max-width:640px;margin:0 auto 30px;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);text-align:left;overflow:hidden}
.demo-head{display:flex;align-items:center;gap:9px;padding:13px 20px;border-bottom:1px solid var(--line);font-size:13px;color:var(--brand);font-weight:700;background:var(--panel2)}
.demo-head .dot{width:8px;height:8px;border-radius:50%;background:#22c55e;box-shadow:0 0 0 4px rgba(34,197,94,.16)}
.demo-q{padding:16px 20px 6px;font-size:15px;font-weight:600;color:var(--ink)}
.demo-think{padding:6px 20px 10px}
.demo-think .ttag{display:inline-block;font-size:12px;color:var(--brand);background:rgba(77,107,254,.10);border-radius:6px;padding:2px 9px;margin-bottom:8px;font-weight:600}
.demo-think p{font-size:13px;color:var(--muted);line-height:1.7}
.demo-think p::before{content:"▸ ";color:var(--brand);font-weight:700}
.demo-a{padding:12px 20px 16px;font-size:15px;color:var(--ink);border-top:1px dashed var(--line)}
.demo-src{display:flex;gap:8px;flex-wrap:wrap;padding:0 20px 18px}
.demo-src span{font-size:12px;color:var(--brand2);background:var(--panel2);border:1px solid var(--line);border-radius:999px;padding:3px 11px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 30px;border-radius:11px;font-weight:700;font-size:16px;border:1px solid transparent;font-family:var(--sans);transition:.18s}
.btn.pri{background:var(--brand-grad);color:#fff;box-shadow:0 8px 22px rgba(45,80,220,.3)}
.btn.pri:hover{transform:translateY(-2px)}
.btn.ghost{border-color:var(--line);color:var(--ink);background:#fff}
.btn.ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn.gold{background:var(--panel2);color:var(--brand);border:1px solid #c9d5ff}
.btn.gold:hover{background:#e6ecff}
.hero-trust{margin-top:28px;display:flex;gap:26px;color:var(--muted);font-size:14px;flex-wrap:wrap;justify-content:center}
.hero-trust b{color:var(--brand);font-weight:700}

/* §1 核心能力:功能网格 */
.feature{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px 24px;transition:.2s}
.feat:hover{border-color:var(--brand);transform:translateY(-4px);box-shadow:var(--shadow)}
.feat .ic{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:18px;background:linear-gradient(135deg,rgba(77,107,254,.14),rgba(56,189,248,.14));font-size:23px}
.feat h3{font-size:18px;margin-bottom:8px}
.feat p{color:var(--muted);font-size:14px;line-height:1.7}

/* §2 深搜流水线 */
.pipeline{max-width:760px;margin:0 auto 40px}
.pipeline svg{width:100%;height:auto}
.pulse{animation:pulse 1.8s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1;r:3}50%{opacity:.25;r:6}}

/* 表格 */
.tbl{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}
.tbl th,.tbl td{padding:15px 20px;text-align:left;border-bottom:1px solid var(--line);font-size:14.5px}
.tbl th{background:var(--panel2);color:var(--brand);font-weight:700}
.tbl tr:last-child td{border-bottom:none}
.tbl-caption{color:var(--muted);font-size:13px;text-align:center;margin-top:14px}

/* 卡片 + 步骤 */
.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 24px;transition:.2s;color:var(--ink)}
.card:hover{border-color:var(--brand);transform:translateY(-4px);box-shadow:var(--shadow)}
.card .ic{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:16px;background:linear-gradient(135deg,rgba(77,107,254,.14),rgba(56,189,248,.14));font-size:22px;color:var(--brand)}
.card h3{font-size:18px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14px}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:st}
.step{background:#fff;border:1px solid var(--line);padding:26px 22px;position:relative;border-radius:14px}
.step::before{counter-increment:st;content:counter(st);position:absolute;top:-16px;left:22px;width:36px;height:36px;line-height:36px;text-align:center;background:var(--brand-grad);color:#fff;font-weight:800;border-radius:10px;box-shadow:0 6px 16px rgba(45,80,220,.28)}
.step h3{font-size:17px;margin:10px 0 8px}
.step p{color:var(--muted);font-size:14px}

/* FAQ */
.faq{display:flex;flex-direction:column;gap:14px;max-width:780px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 24px}
.faq summary{cursor:pointer;font-weight:700;font-size:16px;color:var(--ink);list-style:none;display:flex;align-items:center;gap:12px}
.faq summary::before{content:"?";flex-shrink:0;width:26px;height:26px;line-height:26px;text-align:center;color:#fff;background:var(--brand-grad);border-radius:8px;font-size:14px;font-weight:800}
.faq summary::-webkit-details-marker{display:none}
.faq details p{margin-top:12px;color:var(--muted)}

/* 文章页 */
.article-head{padding:52px 0 30px;background:var(--bg2);border-bottom:1px solid var(--line)}
.article-head h1{font-size:36px;margin:14px 0 12px;letter-spacing:-.01em}
.meta{display:flex;gap:20px;color:var(--muted);font-size:13px;flex-wrap:wrap}
.meta b{color:var(--brand2)}
.article-cols{display:grid;grid-template-columns:250px 1fr;gap:40px;padding:40px 0}
.toc{position:sticky;top:84px;align-self:start;background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px}
.toc h5{font-size:13px;color:var(--brand);letter-spacing:.12em;margin-bottom:14px;font-weight:700}
.toc ol{list-style:none}
.toc li{margin:9px 0;font-size:14px}
.toc .num{display:inline-block;width:22px;height:22px;line-height:22px;text-align:center;background:rgba(77,107,254,.12);color:var(--brand);border-radius:6px;margin-right:9px;font-size:12px;font-weight:700}
.toc a{color:var(--muted)}
.toc a:hover{color:var(--brand)}
.prose{max-width:720px}
.prose h2{font-size:25px;margin:36px 0 14px;padding-left:14px;border-left:4px solid var(--brand)}
.prose h2:first-child{margin-top:0}
.prose p{margin:13px 0;color:#333747}
.prose ul,.prose ol{margin:13px 0;padding-left:26px}
.prose li{margin:6px 0;color:#333747}
.prose figure{margin:24px 0}
.prose figure img{border-radius:12px;border:1px solid var(--line)}
.prose figcaption{color:var(--muted);font-size:13px;text-align:center;margin-top:8px}
.prose blockquote{border-left:3px solid var(--brand);background:var(--panel2);padding:14px 18px;margin:18px 0;color:var(--muted);border-radius:0 10px 10px 0}
.tip,.callout{display:flex;gap:12px;align-items:flex-start;padding:16px 18px;border-radius:12px;margin:18px 0;border:1px solid var(--line)}
.tip{background:#f2f6ff;border-left:3px solid var(--gold)}
.callout{background:#eef2fd;border-left:3px solid var(--brand)}
.tip .e,.callout .e{font-size:18px;flex-shrink:0}
.tip .e{color:var(--brand)}
.callout .e{color:#27ae60}
.tip p,.callout p{margin:0;color:var(--ink);font-size:14px}

/* 相关阅读 */
.related{margin-top:40px}
.rel-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:14px}
.rel-item{background:#fff;border:1px solid var(--line);transition:.2s;border-radius:12px}
.rel-item:hover{border-color:var(--brand);box-shadow:var(--shadow)}
.rel-item a{padding:18px;display:flex;align-items:center;gap:12px;color:var(--ink)}
.rel-item .tag{background:rgba(77,107,254,.12);color:var(--brand);font-size:12px;padding:3px 11px;border-radius:999px;flex-shrink:0;font-weight:600}
.rel-item h4{font-size:15px;color:var(--ink);font-weight:600}
.rel-item .go{margin-left:auto;color:var(--brand);font-size:22px}

/* CTA 带 */
.cta-band{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.cta-inner{padding:64px 0;text-align:center}
.cta-inner h2{font-size:32px;margin-bottom:14px}
.cta-inner p{color:var(--muted);margin-bottom:28px}

/* 页脚 */
.footer{background:#0d1126;color:#c7cde4;border-top:1px solid rgba(255,255,255,.06);padding:56px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;padding-bottom:34px;border-bottom:1px solid rgba(255,255,255,.10)}
.footer h4{color:#fff;font-size:15px;margin-bottom:14px;letter-spacing:.04em}
.footer a{display:block;color:rgba(199,205,228,.6);font-size:14px;margin:9px 0}
.footer a:hover{color:#fff}
.footer .logo{font-size:20px;margin-bottom:12px;color:#fff}
.footer .desc{color:rgba(199,205,228,.5);font-size:14px;line-height:1.8}
.footer .colophon{height:2px;background:linear-gradient(90deg,transparent,var(--brand),transparent);margin:22px 0}
.copyright{text-align:center;color:rgba(199,205,228,.4);font-size:13px;padding-top:22px}

/* 面包屑 / 分享 */
.crumb{color:var(--muted);font-size:13px;margin-bottom:8px}
.crumb a{color:var(--muted)}
.crumb span{color:var(--brand)}
.share{display:flex;gap:12px;margin-top:28px;padding-top:20px;border-top:1px solid var(--line)}
.share a{color:var(--muted);font-size:14px}
.share a:hover{color:var(--brand2)}

/* 下载矩阵图文分屏 */
.manu-band{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.manu-band figure img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:14px;border:1px solid var(--line)}

/* §5 结论 CTA */
.final-cta{position:relative;overflow:hidden;padding:104px 0}
.final-cta .cta-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.14}
.final-cta .cta-shade{position:absolute;inset:0;background:linear-gradient(180deg,var(--bg),rgba(246,248,255,.5),var(--bg))}
.fcta-inner{position:relative}
.cta-card{max-width:600px;margin:0 auto;padding:52px 56px;text-align:center;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow)}
.cta-card h2{font-size:30px;margin-bottom:12px}
.cta-card p{color:var(--muted);margin-bottom:28px}

/* 网站地图按钮网格 */
.sitemap-group{margin-bottom:42px}
.sitemap-group h2{font-size:20px;margin:0 0 6px;padding-left:14px;border-left:4px solid var(--brand);font-weight:700}
.sitemap-note{color:var(--muted);font-size:14px;margin:0 0 18px;padding-left:14px}
.sitemap-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.sitemap-grid a{display:block;background:#fff;border:1px solid var(--line);border-radius:10px;padding:13px 16px;color:var(--ink);font-size:14px;text-decoration:none;transition:.15s}
.sitemap-grid a:hover{border-color:var(--brand);color:var(--brand);background:var(--panel2);transform:translateY(-2px);box-shadow:var(--shadow)}

@media(max-width:900px){
 .article-cols,.manu-band{grid-template-columns:1fr}
 .bento,.feature,.steps{grid-template-columns:1fr 1fr}
 .sitemap-grid{grid-template-columns:1fr 1fr}
 .footer-grid{grid-template-columns:1fr 1fr}
 .toc{position:static}
}
@media(max-width:600px){
 .bento,.feature,.steps{grid-template-columns:1fr}
 .sitemap-grid{grid-template-columns:1fr}
 .hero h1{font-size:36px}
 .nav-links{display:none}
 .cap-grid{grid-template-columns:1fr}
 .bubble{max-width:100%}
}

/* 深搜会话流(首页) */
.scroll-hint{color:var(--muted);font-size:14px;margin-top:26px}
.scroll-hint b{color:var(--brand);font-weight:700}
.chat{padding:12px 0 96px}
.chat-inner{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:26px}
.msg{display:flex;gap:14px;align-items:flex-start}
.msg.user{flex-direction:row-reverse}
.avatar{flex-shrink:0;width:36px;height:36px;border-radius:11px;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700}
.msg.user .avatar{background:var(--panel2);border:1px solid var(--line);color:var(--muted)}
.msg.ai .avatar{background:var(--brand-grad);color:#fff;box-shadow:0 6px 16px rgba(45,80,220,.28)}
.bubble{max-width:640px;padding:18px 22px;border-radius:16px;font-size:15px;line-height:1.85}
.msg.user .bubble{background:var(--panel2);border:1px solid var(--line);border-top-right-radius:4px;color:var(--ink);font-weight:600}
.msg.ai .bubble{background:#fff;border:1px solid var(--line);border-top-left-radius:4px;box-shadow:var(--shadow);flex:1}
.think{margin-bottom:4px}
.ttag{display:inline-block;font-size:12px;color:var(--brand);background:rgba(77,107,254,.10);border-radius:7px;padding:3px 11px;margin-bottom:10px;font-weight:700}
.think p{font-size:13.5px;color:var(--muted);line-height:1.85}
.think p::before{content:"▸ ";color:var(--brand);font-weight:700}
.ans-title{font-weight:800;font-size:16px;margin-bottom:14px;color:var(--ink)}
.cap-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.cap{display:flex;gap:12px;align-items:flex-start;padding:14px;border:1px solid var(--line);border-radius:12px;background:var(--panel2)}
.cap .ic{font-size:20px;line-height:1.3}
.cap b{display:block;font-size:14.5px;margin-bottom:3px;color:var(--ink)}
.cap span{font-size:13px;color:var(--muted);line-height:1.7}
.pipeline-full{margin:16px 0 6px}
.pipeline-full svg{width:100%;height:auto}
.platform-row{display:flex;gap:12px;flex-wrap:wrap}
.plat{flex:1;min-width:96px;text-align:center;padding:18px 8px;border:1px solid var(--line);border-radius:12px;background:var(--panel2)}
.plat .e{font-size:26px;display:block;margin-bottom:8px;line-height:1}
.plat b{font-size:14px;display:block;margin-bottom:2px;color:var(--ink)}
.plat span{font-size:12px;color:var(--muted)}
.faq-mini{display:flex;flex-direction:column;gap:10px}
.fq{padding:12px 14px;border:1px solid var(--line);border-radius:12px;background:var(--panel2)}
.fq b{display:block;font-size:14px;margin-bottom:3px;color:var(--ink)}
.fq span{font-size:13.5px;color:var(--muted)}