:root{
  --navy:#071426; --navy-2:#0b2038; --ink:#0d1b2f; --muted:#5f7088;
  --line:#e2e9f3; --soft:#f5f8fd; --white:#fff;
  --blue:#1f6feb; --blue-dark:#1557c0; --cyan:#37d3f2; --green:#0f9d76; --amber:#b7791f; --red:#d64545;
  --radius:16px; --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--white);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",-apple-system,"Segoe UI",sans-serif;font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased}
img,svg,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit}
.container{width:min(var(--max),calc(100% - 36px));margin:0 auto}
.eyebrow{display:inline-flex;align-items:center;gap:7px;font-size:12px;letter-spacing:1.6px;font-weight:800;color:var(--blue);text-transform:uppercase}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--blue)}
.section{padding:64px 0}
.section-head{max-width:720px;margin-bottom:32px}
.section-head h2{font-size:clamp(24px,4vw,34px);line-height:1.3;margin:10px 0 12px;letter-spacing:-.5px}
.section-head p{color:var(--muted);margin:0;font-size:14px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border-radius:10px;border:1px solid transparent;font-weight:700;font-size:14px;cursor:pointer;transition:.18s;white-space:nowrap}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 8px 22px rgba(31,111,235,.28)}
.btn-primary:hover{background:var(--blue-dark)}
.btn-ghost{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.28);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.16)}
.btn-light{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-light:hover{border-color:#bfd2ea}
.btn-sm{padding:8px 14px;font-size:13px;border-radius:8px}
.badge{display:inline-flex;align-items:center;gap:5px;padding:3px 9px;border-radius:999px;font-size:11px;font-weight:700}
.badge-blue{background:#eaf1ff;color:#1b5fc4}
.badge-green{background:#e7f8f1;color:#0b7a5e}
.badge-red{background:#fdeaea;color:#a72b2b}
.badge-gray{background:#eff3f8;color:#64748b}

/* 导航 */
.nav{position:sticky;top:0;z-index:60;background:rgba(7,20,38,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.1)}
.nav-inner{height:66px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.logo{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;letter-spacing:.5px}
.logo-mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,#2a7cf0,#37d3f2);display:grid;place-items:center;font-size:15px;color:#fff;box-shadow:0 5px 16px rgba(42,124,240,.4)}
.logo small{display:block;font-size:10px;color:#87a4c8;font-weight:500;letter-spacing:1.5px}
.nav-links{display:none;align-items:center;gap:26px;color:#c4d4e8;font-size:14px}
.nav-links a:hover{color:#fff}
.nav-actions{display:flex;align-items:center;gap:8px}
.nav-toggle{display:grid;place-items:center;width:40px;height:38px;background:none;border:1px solid rgba(255,255,255,.2);border-radius:9px;color:#fff;cursor:pointer}
@media(min-width:900px){.nav-links{display:flex}.nav-toggle{display:none}}
.mobile-menu{display:none;padding:12px 0 18px;border-top:1px solid rgba(255,255,255,.1)}
.mobile-menu a{display:block;padding:11px 4px;color:#d8e6f7;font-size:14px}
.mobile-menu.open{display:block}

/* Hero */
.hero{position:relative;background:radial-gradient(1100px 600px at 82% -10%,rgba(55,211,242,.22),transparent 60%),linear-gradient(160deg,#061224 0%,#0a2038 58%,#0c2a47 100%);color:#fff;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(120,170,230,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(120,170,230,.07) 1px,transparent 1px);background-size:64px 64px;pointer-events:none}
.hero-inner{position:relative;z-index:2;padding:62px 0 58px;display:grid;gap:34px}
.hero-copy h1{font-size:clamp(30px,7vw,52px);line-height:1.22;letter-spacing:-1px;margin:14px 0 16px}
.hero-copy h1 em{font-style:normal;color:#6fe3ff;position:relative;white-space:nowrap}
.hero-copy h1 em::after{content:"";position:absolute;left:0;right:0;bottom:4px;height:9px;background:rgba(55,211,242,.18);z-index:-1}
.hero-sub{color:#b7cbe2;font-size:15px;max-width:600px;margin:0 0 24px}
.hero-points{display:grid;gap:9px;margin:0 0 28px;padding:0;list-style:none}
.hero-points li{display:flex;gap:9px;align-items:flex-start;font-size:14px;color:#dcebfa}
.hero-points .tick{flex:none;width:18px;height:18px;border-radius:50%;background:rgba(55,211,242,.16);color:#6fe3ff;display:grid;place-items:center;font-size:11px;margin-top:2px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.hero-note{margin-top:14px;color:#7f97b5;font-size:12px}
.hero-visual{position:relative}
.shot{position:relative;border-radius:14px;overflow:hidden;border:1px solid rgba(120,180,240,.28);box-shadow:0 30px 70px rgba(0,0,0,.45);background:#0b2038}
.shot img{width:100%;display:block}
.shot::before{content:"产品界面 · 演示";position:absolute;left:12px;top:12px;z-index:2;background:rgba(5,16,30,.8);border:1px solid rgba(255,255,255,.16);color:#bfe3ff;font-size:11px;padding:3px 9px;border-radius:999px}
.shot-bar{height:32px;background:#0d2442;display:flex;align-items:center;gap:6px;padding:0 12px;border-bottom:1px solid rgba(120,180,240,.2)}
.shot-bar i{width:8px;height:8px;border-radius:50%;background:#3d6a9c}
.shot-cap{font-size:11px;color:#7f97b5;margin-top:10px;text-align:right}
.hero-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.12);border-radius:12px;overflow:hidden;margin-top:22px}
.hero-stats div{background:rgba(8,25,44,.72);padding:13px 14px}
.hero-stats b{display:block;font-size:17px;color:#eaf7ff}
.hero-stats span{font-size:11px;color:#8aa6c4}

/* 能力卡 */
.cap-grid{display:grid;gap:16px}
@media(min-width:680px){.cap-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1020px){.cap-grid{grid-template-columns:repeat(4,1fr)}}
.cap-card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;display:flex;flex-direction:column}
.cap-media{aspect-ratio:16/10;background:#eef4fb;overflow:hidden}
.cap-media img,.cap-media video{width:100%;height:100%;object-fit:cover}
.cap-body{padding:16px 16px 18px}
.cap-body h3{font-size:16px;margin:0 0 7px}
.cap-body p{font-size:13px;color:var(--muted);margin:0;line-height:1.65}
.cap-extra{margin-top:12px;font-size:11px;color:#7b8ca3;border-top:1px dashed var(--line);padding-top:10px}
.cap-audio{display:flex;align-items:center;gap:10px;padding:12px 14px;background:#0b2038;color:#dff3ff;font-size:12px}
.cap-audio button{width:32px;height:32px;border-radius:50%;border:1px solid rgba(255,255,255,.3);background:rgba(55,211,242,.18);color:#fff;cursor:pointer}
.cap-audio .wave{flex:1;height:16px;background:repeating-linear-gradient(90deg,#3d7fb0 0 2px,transparent 2px 6px);opacity:.8}

/* 效果演示 */
.demos{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.demo-shell{position:relative}
.demo-track{display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;padding-bottom:8px;scrollbar-width:none}
.demo-track::-webkit-scrollbar{display:none}
.demo-card{flex:0 0 86%;scroll-snap-align:start;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}
@media(min-width:700px){.demo-card{flex-basis:48%}}
@media(min-width:1050px){.demo-card{flex-basis:32%}}
.demo-media{position:relative;aspect-ratio:16/9;background:#08182d}
.demo-media img,.demo-media video{width:100%;height:100%;object-fit:cover}
.demo-play{position:absolute;inset:0;display:grid;place-items:center;background:linear-gradient(180deg,transparent,rgba(3,10,20,.65));border:none;cursor:pointer;width:100%}
.demo-play span{width:48px;height:48px;border-radius:50%;background:rgba(255,255,255,.92);color:var(--blue);display:grid;place-items:center;font-size:19px;box-shadow:0 8px 20px rgba(0,0,0,.28)}
.demo-info{padding:14px 16px}
.demo-info h3{font-size:15px;margin:0 0 6px}
.demo-info p{font-size:12px;color:var(--muted);margin:0}
.demo-nav{display:flex;gap:8px;justify-content:flex-end;margin-top:12px}
.demo-nav button{width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:#fff;cursor:pointer}
.demo-hint{font-size:11px;color:#8899ad;margin-top:8px}

/* 场景 */
.scene-grid{display:grid;gap:14px}
@media(min-width:680px){.scene-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.scene-grid{grid-template-columns:repeat(5,1fr)}}
.scene{border:1px solid var(--line);border-radius:14px;padding:18px;background:#fff;transition:.18s}
.scene:hover{border-color:#b8d2ef;transform:translateY(-2px)}
.scene-icon{width:38px;height:38px;border-radius:10px;background:#eef4ff;color:var(--blue);display:grid;place-items:center;font-weight:800;font-size:13px;margin-bottom:12px}
.scene h3{font-size:15px;margin:0 0 6px}
.scene p{font-size:12px;color:var(--muted);margin:0 0 10px;line-height:1.65}
.chips{display:flex;flex-wrap:wrap;gap:5px}
.chip{font-size:10px;background:#f1f5fb;color:#5c6f88;border-radius:999px;padding:2px 8px}

/* 套餐 */
.packages{background:linear-gradient(180deg,#f7faff,#fff)}
.price-grid{display:grid;gap:16px}
@media(min-width:860px){.price-grid{grid-template-columns:repeat(3,1fr)}}
.price-card{border:1px solid var(--line);border-radius:18px;padding:22px;background:#fff;display:flex;flex-direction:column;position:relative}
.price-card.recommended{border-color:#9dc0f5;box-shadow:0 18px 46px rgba(31,111,235,.16)}
.price-badge{position:absolute;top:-11px;right:18px;background:var(--blue);color:#fff;font-size:11px;font-weight:700;padding:3px 10px;border-radius:999px}
.price-card h3{font-size:18px;margin:0 0 4px}
.price-card .sub{color:var(--muted);font-size:12px;min-height:20px}
.price{display:flex;align-items:baseline;gap:5px;margin:16px 0 4px}
.price b{font-size:30px;letter-spacing:-1px}
.price span{font-size:12px;color:var(--muted)}
.price-line{height:1px;background:var(--line);margin:14px 0}
.features{list-style:none;padding:0;margin:0;display:grid;gap:8px;flex:1}
.features li{display:flex;gap:8px;font-size:13px;color:#374a63}
.features li::before{content:"✓";color:var(--green);font-weight:800}
.price-card .btn{margin-top:18px;width:100%}
.price-note{font-size:12px;color:var(--muted);margin-top:14px}

/* FAQ */
.faq-list{display:grid;gap:10px;max-width:860px}
.faq-item{border:1px solid var(--line);border-radius:12px;background:#fff;overflow:hidden}
.faq-q{width:100%;display:flex;justify-content:space-between;gap:14px;align-items:center;padding:16px 18px;background:none;border:none;text-align:left;font-weight:700;font-size:14px;cursor:pointer}
.faq-q i{font-style:normal;color:var(--blue);font-size:18px;flex:none}
.faq-a{display:none;padding:0 18px 16px;color:var(--muted);font-size:13px;line-height:1.85}
.faq-item.open .faq-a{display:block}

/* CTA band */
.cta-band{background:linear-gradient(135deg,#081a30,#0e3357);color:#fff;border-radius:18px;padding:34px 26px;display:flex;flex-direction:column;gap:18px;align-items:flex-start;margin:20px auto 0}
.cta-band h2{margin:0;font-size:clamp(21px,4vw,30px)}
.cta-band p{margin:6px 0 0;color:#a9c1da;font-size:13px}
.cta-band .btn{flex:none}

/* 页脚 */
.footer{background:#061223;color:#9fb4cc;padding:42px 0 24px;margin-top:64px}
.footer-grid{display:grid;gap:26px}
@media(min-width:860px){.footer-grid{grid-template-columns:1.3fr .8fr .9fr}}
.footer h4{color:#fff;font-size:14px;margin:0 0 12px}
.footer p{font-size:12px;line-height:1.8;margin:0}
.footer .company{color:#dbe9f7;font-weight:700}
.footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:28px;padding-top:16px;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;font-size:11px;color:#6f8aa7}
.footer-qr{width:104px;height:104px;border-radius:10px;background:#fff;padding:5px}
.footer-contact-line{display:flex;gap:8px;align-items:center;margin-bottom:8px;font-size:12px;color:#cfe2f4}

/* 悬浮客服 */
.fab{position:fixed;right:16px;bottom:20px;z-index:70;display:flex;align-items:center;gap:8px;background:var(--blue);color:#fff;border:none;border-radius:999px;padding:11px 16px;font-size:13px;font-weight:700;cursor:pointer;box-shadow:0 12px 30px rgba(31,111,235,.4)}
.fab span{width:18px;height:18px;border-radius:50%;background:rgba(255,255,255,.25);display:grid;place-items:center;font-size:11px}
.modal-mask{position:absolute;top:0;left:0;right:0;height:100vh;background:rgba(4,13,24,.66);z-index:80;display:none;align-items:center;justify-content:center;padding:14px;overflow:hidden}
.modal-mask.open{display:flex}
.service-modal{width:min(430px,100%);max-height:calc(100vh - 28px);background:#fff;border-radius:18px;box-shadow:0 30px 80px rgba(0,0,0,.4);margin:auto;overflow-y:auto}
.service-head{background:linear-gradient(135deg,#0a2340,#124a7a);color:#fff;padding:18px 20px;display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
.service-head h3{margin:0;font-size:17px}
.service-head p{margin:4px 0 0;font-size:11px;color:#a8c9e6}
.service-close{background:none;border:none;color:#fff;font-size:20px;cursor:pointer;line-height:1}
.service-body{display:block;padding:16px 20px 18px}
.service-qr{width:150px;height:150px;margin:0 auto 6px;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
.service-qr img{width:100%;height:100%;object-fit:contain}
.qr-tip{text-align:center;font-size:11px;color:#7b8ca3;margin:0 0 14px}
.service-row{display:flex;justify-content:space-between;gap:10px;align-items:center;border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-bottom:8px;font-size:13px}
.service-row b{font-size:12px;color:var(--muted);font-weight:500}
.service-row .val{font-weight:700;display:flex;gap:8px;align-items:center;word-break:break-all;justify-content:flex-end;text-align:right}
.copy-btn{border:1px solid var(--line);background:#fff;border-radius:7px;padding:4px 8px;font-size:11px;cursor:pointer;color:var(--blue);flex:none}
.service-work{font-size:12px;color:var(--muted);margin:10px 0 4px}
.service-offline{background:#fff8e6;border:1px solid #f3dfa8;color:#8a5a00;border-radius:9px;padding:8px 10px;font-size:11px;margin:8px 0}
.ask-box{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:11px;margin-top:12px}
.ask-box label{font-size:11px;color:var(--muted);font-weight:700}
.ask-box textarea{width:100%;border:1px solid var(--line);border-radius:8px;padding:8px;font:inherit;font-size:12px;line-height:1.7;margin:6px 0 8px;resize:vertical;min-height:78px;background:#fff}
.service-actions{display:flex;gap:8px}
.service-actions .btn{flex:1}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%) translateY(10px);background:#0d1b2f;color:#fff;font-size:13px;padding:9px 16px;border-radius:999px;opacity:0;transition:.25s;z-index:90;pointer-events:none}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

@media(min-width:900px){
  .hero-inner{grid-template-columns:1.05fr .95fr;align-items:center;padding:84px 0 78px;gap:44px}
  .hero-stats{grid-template-columns:repeat(4,1fr);grid-column:1/-1}
  .cta-band{flex-direction:row;justify-content:space-between;align-items:center;padding:36px 34px}
}