/* 路都机器人 LUDU ROBOTICS - dark tech theme */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:#0a0f1e;color:#e6edf7;line-height:1.7;font-size:16px;overflow-x:hidden}
a{color:inherit;text-decoration:none;transition:color .25s}
img{max-width:100%;display:block}
ul,ol{list-style:none}
.container{width:min(1200px,92%);margin:0 auto}
:root{--accent:#00d4ff;--accent2:#3d7bff;--bg:#0a0f1e;--bg2:#0f1628;--bg3:#141d33;--line:rgba(0,212,255,.14);--muted:#8b98b3}
::selection{background:rgba(0,212,255,.35)}
/* ===== header ===== */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .3s,box-shadow .3s;background:linear-gradient(180deg,rgba(8,12,24,.92),rgba(8,12,24,.75));backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,.06)}
.site-header.scrolled{background:rgba(8,12,24,.97);box-shadow:0 6px 30px rgba(0,0,0,.45)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;letter-spacing:1px}
.logo svg{width:34px;height:34px;flex:none}
.logo small{display:block;font-size:10px;font-weight:400;color:var(--muted);letter-spacing:3px;line-height:1}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav>li{position:relative}
.main-nav>li>a{display:block;padding:10px 16px;font-size:15px;color:#c9d5ea;border-radius:6px}
.main-nav>li>a:hover,.main-nav>li>a.active{color:var(--accent)}
.main-nav>li.has-sub>a::after{content:"";display:inline-block;margin-left:6px;border:4px solid transparent;border-top-color:#7f8cab;vertical-align:middle}
.sub-nav{position:absolute;top:100%;left:0;min-width:190px;background:var(--bg3);border:1px solid var(--line);border-radius:10px;padding:8px;opacity:0;visibility:hidden;transform:translateY(8px);transition:all .25s;box-shadow:0 20px 50px rgba(0,0,0,.5)}
.main-nav>li:hover .sub-nav{opacity:1;visibility:visible;transform:translateY(2px)}
.sub-nav a{display:block;padding:10px 14px;font-size:14px;color:#c9d5ea;border-radius:6px}
.sub-nav a:hover{background:rgba(0,212,255,.08);color:var(--accent)}
.nav-cta{margin-left:14px;padding:10px 22px!important;background:linear-gradient(120deg,var(--accent),var(--accent2));color:#04121f!important;font-weight:700;border-radius:999px!important}
.nav-cta:hover{box-shadow:0 0 24px rgba(0,212,255,.5)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:2px;background:#e6edf7;margin:5px 0;transition:.3s}
/* ===== hero ===== */
.hero{position:relative;min-height:92vh;display:flex;align-items:center;padding:140px 0 100px;overflow:hidden}
.hero-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.38}
.hero-mask{position:absolute;inset:0;background:linear-gradient(100deg,rgba(10,15,30,.96) 20%,rgba(10,15,30,.55) 60%,rgba(10,15,30,.85)),radial-gradient(ellipse at 75% 25%,rgba(0,212,255,.14),transparent 55%)}
.hero-inner{position:relative;z-index:2;max-width:760px}
.hero-tag{display:inline-flex;align-items:center;gap:8px;padding:7px 16px;border:1px solid var(--line);border-radius:999px;font-size:13px;color:var(--accent);background:rgba(0,212,255,.06);letter-spacing:2px}
.hero h1{font-size:clamp(34px,5vw,58px);line-height:1.25;margin:26px 0 18px;font-weight:800}
.hero h1 .hl{background:linear-gradient(100deg,var(--accent),#7ad0ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(16px,2vw,20px);color:#b9c6de;max-width:640px}
.hero-actions{display:flex;gap:16px;margin-top:38px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 34px;border-radius:999px;font-size:16px;font-weight:600;transition:.25s;cursor:pointer;border:0}
.btn-primary{background:linear-gradient(120deg,var(--accent),var(--accent2));color:#04121f}
.btn-primary:hover{box-shadow:0 8px 34px rgba(0,212,255,.45);transform:translateY(-2px)}
.btn-ghost{border:1px solid rgba(255,255,255,.25);color:#e6edf7}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.hero-stats{display:flex;gap:0;margin-top:64px;border:1px solid var(--line);border-radius:16px;background:rgba(13,20,38,.62);backdrop-filter:blur(8px);flex-wrap:wrap}
.hero-stats li{flex:1;min-width:150px;padding:22px 18px;text-align:center;border-right:1px solid rgba(255,255,255,.06)}
.hero-stats li:last-child{border-right:0}
.hero-stats b{display:block;font-size:30px;font-weight:800;color:var(--accent);font-family:Consolas,monospace}
.hero-stats span{font-size:13px;color:var(--muted)}
/* ===== sections ===== */
.section{padding:96px 0}
.section.alt{background:var(--bg2)}
.sec-head{text-align:center;max-width:720px;margin:0 auto 56px}
.sec-head .kicker{color:var(--accent);font-size:14px;letter-spacing:4px;font-weight:600}
.sec-head h2{font-size:clamp(26px,3.4vw,38px);margin:12px 0 14px;font-weight:800}
.sec-head p{color:var(--muted)}
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
/* cards */
.card{background:var(--bg3);border:1px solid rgba(255,255,255,.07);border-radius:16px;overflow:hidden;transition:.3s;display:block}
.card:hover{transform:translateY(-6px);border-color:rgba(0,212,255,.45);box-shadow:0 18px 50px rgba(0,0,0,.45)}
.card .thumb{aspect-ratio:16/10;overflow:hidden;background:#0b1120}
.card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.card:hover .thumb img{transform:scale(1.06)}
.card .body{padding:22px 24px 26px}
.card h3{font-size:19px;margin-bottom:8px}
.card p{font-size:14px;color:var(--muted);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card .more{display:inline-block;margin-top:14px;color:var(--accent);font-size:14px}
.card .meta{display:flex;gap:14px;margin-top:14px;font-size:12.5px;color:#7d89a5}
/* product split */
.prod-split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.prod-split .pic{border-radius:18px;overflow:hidden;border:1px solid var(--line);background:#0b1120}
.prod-split h3{font-size:30px;margin-bottom:16px}
.prod-split ul{margin:18px 0 26px}
.prod-split ul li{padding:7px 0 7px 26px;position:relative;color:#c3cfe6}
.prod-split ul li::before{content:"";position:absolute;left:0;top:15px;width:14px;height:14px;border-radius:50%;background:radial-gradient(circle at 35% 35%,var(--accent),var(--accent2));opacity:.9}
/* comparison table */
.tbl-wrap{overflow-x:auto;border-radius:16px;border:1px solid var(--line)}
table.cmp{width:100%;border-collapse:collapse;min-width:720px;background:rgba(13,20,38,.7)}
.cmp th,.cmp td{padding:15px 20px;text-align:center;border-bottom:1px solid rgba(255,255,255,.07);font-size:15px}
.cmp th{background:rgba(0,212,255,.08);color:#dfe9fb;font-weight:700}
.cmp td:first-child{text-align:left;color:#aab7d0;white-space:nowrap}
.cmp tr:last-child td{border-bottom:0}
.cmp .good{color:var(--accent);font-weight:600}
.cmp .bad{color:#ff6b81}
.cmp .mid{color:#d9b96a}
/* steps */
.steps{counter-reset:step;display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.step{position:relative;padding:26px 22px;background:var(--bg3);border:1px solid rgba(255,255,255,.07);border-radius:14px}
.step::before{counter-increment:step;content:"0" counter(step);font-size:34px;font-weight:800;color:rgba(0,212,255,.35);font-family:Consolas,monospace;display:block;margin-bottom:10px}
.step h4{font-size:17px;margin-bottom:6px}
.step p{font-size:13.5px;color:var(--muted)}
/* proof timeline */
.proof-list{display:grid;gap:22px}
.proof-item{display:grid;grid-template-columns:300px 1fr;gap:26px;background:var(--bg3);border:1px solid rgba(255,255,255,.07);border-radius:16px;overflow:hidden;transition:.3s}
.proof-item:hover{border-color:rgba(0,212,255,.4)}
.proof-item .pic{height:100%;min-height:190px}
.proof-item .pic img{width:100%;height:100%;object-fit:cover}
.proof-item .txt{padding:26px 30px 26px 4px}
.proof-item .date{color:var(--accent);font-size:13px;letter-spacing:1px}
.proof-item h3{font-size:20px;margin:8px 0 10px}
.proof-item p{color:var(--muted);font-size:14.5px}
/* base */
.base-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.base-card{position:relative;border-radius:16px;overflow:hidden;min-height:300px;display:flex;align-items:flex-end;border:1px solid rgba(255,255,255,.07)}
.base-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.55;transition:.5s}
.base-card:hover img{opacity:.75;transform:scale(1.04)}
.base-card .cap{position:relative;z-index:2;padding:26px;width:100%;background:linear-gradient(transparent,rgba(6,10,20,.92))}
.base-card h3{font-size:21px}
.base-card p{color:#c3cfe6;font-size:14px}
/* cta banner */
.cta-band{position:relative;padding:88px 0;text-align:center;background:linear-gradient(120deg,rgba(0,212,255,.12),rgba(61,123,255,.12)),var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.cta-band h2{font-size:clamp(24px,3.2vw,36px);margin-bottom:14px}
.cta-band p{color:var(--muted);margin-bottom:30px}
/* ===== footer ===== */
.site-footer{background:#070b16;border-top:1px solid rgba(255,255,255,.06);padding:70px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:50px}
.site-footer h4{font-size:16px;margin-bottom:20px;color:#dfe9fb}
.site-footer li{margin-bottom:10px}
.site-footer li a,.site-footer p{color:var(--muted);font-size:14px}
.site-footer li a:hover{color:var(--accent)}
.footer-brand p{margin-top:14px;max-width:300px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.06);padding:22px 0;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:#6c7793;font-size:13px}
/* ===== sub banner (list/cover) ===== */
.sub-banner{padding:150px 0 64px;background:radial-gradient(ellipse at 20% 0%,rgba(0,212,255,.16),transparent 55%),radial-gradient(ellipse at 85% 15%,rgba(61,123,255,.14),transparent 50%),var(--bg2);border-bottom:1px solid rgba(255,255,255,.05)}
.sub-banner h1{font-size:clamp(26px,3.4vw,38px)}
.sub-banner .crumb{margin-top:10px;color:var(--muted);font-size:13.5px}
.sub-banner .crumb a:hover{color:var(--accent)}
/* list page */
.list-main{padding:70px 0 90px}
.list-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.list-grid .card .body{padding:20px 22px 24px}
.pagenavi{margin-top:56px;display:flex;justify-content:center}
.pagenavi a,.pagenavi b,.pagenavi .epages a,.pagenavi .epages b{display:inline-flex;align-items:center;justify-content:center;min-width:40px;height:40px;padding:0 12px;margin:0 5px;border:1px solid rgba(255,255,255,.14);border-radius:8px;font-size:14px;color:#c9d5ea}
.pagenavi .epages{display:flex;flex-wrap:wrap;justify-content:center}
.pagenavi b,.pagenavi .epages b{background:linear-gradient(120deg,var(--accent),var(--accent2));color:#04121f;border-color:transparent;font-weight:700}
.pagenavi a:hover{border-color:var(--accent);color:var(--accent)}
/* article content */
.article-wrap{padding:60px 0 90px}
.article{max-width:860px;margin:0 auto;background:var(--bg3);border:1px solid rgba(255,255,255,.07);border-radius:18px;padding:48px 54px}
.article .a-meta{display:flex;gap:22px;color:#7d89a5;font-size:13.5px;margin-bottom:26px;padding-bottom:22px;border-bottom:1px dashed rgba(255,255,255,.1)}
.article .a-meta .cat{color:var(--accent)}
.article h1{font-size:clamp(24px,3vw,32px);line-height:1.4;margin-bottom:8px}
.article .a-hero{margin:26px 0 6px;border-radius:12px;overflow:hidden}
.article-content{font-size:16px;color:#cdd8ec}
.article-content h2{font-size:23px;margin:38px 0 16px;padding-left:14px;border-left:4px solid var(--accent)}
.article-content h3{font-size:19px;margin:30px 0 12px;color:#e6edf7}
.article-content p{margin:14px 0}
.article-content ul{margin:14px 0;padding-left:0}
.article-content ul li{position:relative;padding:5px 0 5px 24px;color:#c3cfe6}
.article-content ul li::before{content:"";position:absolute;left:2px;top:15px;width:8px;height:8px;border-radius:50%;background:var(--accent)}
.article-content img{border-radius:12px;margin:20px auto}
.article-content video{width:100%;border-radius:12px;margin:20px 0;background:#000}
.article-content strong{color:#fff}
.article-content table{width:100%;border-collapse:collapse;margin:22px 0;min-width:560px}
.article-content th,.article-content td{border:1px solid rgba(255,255,255,.12);padding:11px 14px;font-size:14.5px;text-align:center}
.article-content th{background:rgba(0,212,255,.1);color:#e6f2ff}
.article-content td:first-child{color:#aab7d0}
.article-content td:nth-child(2){text-align:left}
.article-note{margin-top:16px;padding:16px 20px;border-radius:10px;background:rgba(0,212,255,.07);border:1px solid var(--line);font-size:14px;color:#9fd8ec}
/* ===== contact cover ===== */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin:54px 0}
.contact-card{background:var(--bg3);border:1px solid rgba(255,255,255,.07);border-radius:16px;padding:34px 28px;text-align:center}
.contact-card .ico{width:56px;height:56px;margin:0 auto 18px;border-radius:14px;display:flex;align-items:center;justify-content:center;background:rgba(0,212,255,.1);border:1px solid var(--line)}
.contact-card .ico svg{width:26px;height:26px;stroke:var(--accent);fill:none;stroke-width:1.8}
.contact-card h3{font-size:18px;margin-bottom:8px}
.contact-card p{color:var(--muted);font-size:14.5px}
.contact-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:30px}
/* reveal animation */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.on{opacity:1;transform:none}
/* responsive */
@media (max-width:1024px){
.grid-4{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(2,1fr)}
.list-grid{grid-template-columns:repeat(2,1fr)}
.footer-grid{grid-template-columns:1fr 1fr}
.prod-split{grid-template-columns:1fr;gap:30px}
.proof-item{grid-template-columns:1fr}
.proof-item .txt{padding:0 26px 26px}
.contact-grid,.contact-flow{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:768px){
.nav-toggle{display:block}
.main-nav{position:fixed;top:72px;left:0;right:0;background:rgba(8,12,24,.98);flex-direction:column;align-items:stretch;padding:14px 6%;gap:2px;display:none;border-bottom:1px solid var(--line);max-height:calc(100vh - 72px);overflow:auto}
.main-nav.open{display:flex}
.main-nav>li>a{padding:14px 10px;border-bottom:1px solid rgba(255,255,255,.05)}
.sub-nav{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;background:transparent;border:0;padding:0 0 8px 18px;display:none}
.main-nav>li:hover .sub-nav{display:none}
.main-nav>li.expanded .sub-nav{display:block}
.nav-cta{margin:12px 0 6px;text-align:center;justify-content:center}
.hero{min-height:auto;padding:130px 0 80px}
.hero-stats b{font-size:24px}
.section{padding:64px 0}
.grid-2,.grid-3,.grid-4,.list-grid,.contact-grid,.contact-flow,.base-grid{grid-template-columns:1fr}
.article{padding:34px 24px}
.footer-grid{grid-template-columns:1fr}
}