/* 英哲数科 yingzihe.com 视觉规范复用（二级页版式，逐像素对齐官网）
   设计令牌取自官网 :root；类名沿用 .topbar / .mainnav / .page-hero / .breadcrumb / .section / .btn-* / .footer */
:root{
  --c-primary:#0E3A66;
  --c-primary-light:#1B5A94;
  --c-primary-deep:#0A2B4C;
  --c-accent:#00A3B4;
  --c-emphasis:#E8A33D;
  --c-bg-alt:#F4F7FA;
  --c-line:#E5E9F0;
  --c-text:#1F2937;
  --c-text-2:#6B7280;
  --radius:10px;
  --radius-lg:16px;
  --container:1200px;
  --font-num:"Bahnschrift","DIN Alternate",-apple-system,Segoe UI,Roboto,sans-serif;
  --font-body:"PingFang SC","Microsoft YaHei",-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);color:var(--c-text);background:#fff;line-height:1.7;font-size:15px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{width:var(--container);max-width:92%;margin:0 auto}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums}

/* 顶栏 */
.topbar{background:linear-gradient(90deg,var(--c-primary-deep),var(--c-primary));color:#fff;font-size:13px}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;height:42px}
.topbar .brand{font-weight:700;letter-spacing:.5px;display:flex;align-items:center;gap:8px}
.topbar .brand .dot{width:8px;height:8px;border-radius:50%;background:var(--c-accent);display:inline-block}
.topbar .tag{color:#bcd3e8;font-size:12px}
.topbar .links{display:flex;gap:18px}
.topbar .links a{color:#cfe0ef;opacity:.9}
.topbar .links a:hover{color:#fff}

/* 主导航 */
.mainnav{background:#fff;position:sticky;top:0;z-index:50;border-bottom:1px solid var(--c-line);box-shadow:0 2px 10px rgba(14,58,102,.04)}
.mainnav .wrap{display:flex;align-items:center;height:58px;gap:26px}
.mainnav .logo{font-weight:800;color:var(--c-primary);font-size:19px;display:flex;align-items:center;gap:8px}
.mainnav .logo small{font-size:11px;color:var(--c-text-2);font-weight:500}
.mainnav .menu{display:flex;gap:22px;margin-left:auto;font-size:15px}
.mainnav .menu a{color:var(--c-text);padding:6px 0;position:relative}
.mainnav .menu a:hover{color:var(--c-primary)}
.mainnav .menu a.active{color:var(--c-primary);font-weight:700}
.mainnav .menu a.active::after{content:"";position:absolute;left:0;right:0;bottom:-19px;height:3px;background:var(--c-accent);border-radius:3px}

/* 模块吸顶菜单 */
.modnav{position:sticky;top:58px;z-index:40;background:var(--c-bg-alt);border-bottom:1px solid var(--c-line)}
.modnav .wrap{display:flex;flex-wrap:wrap;gap:4px;padding:8px 0;overflow-x:auto}
.modnav a.mi{font-size:13px;color:var(--c-text-2);padding:5px 12px;border-radius:20px;white-space:nowrap}
.modnav a.mi:hover{background:#e7eef6;color:var(--c-primary)}
.modnav a.mi.cur{background:var(--c-primary);color:#fff}
.modnav a.mi.cta{background:var(--c-accent);color:#fff;font-weight:700}

/* Hero */
.hero{background:
  radial-gradient(1200px 400px at 85% 120%,rgba(0,163,180,.35),transparent 60%),
  linear-gradient(135deg,var(--c-primary-deep),var(--c-primary) 60%,var(--c-primary-light));
  color:#fff;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background-image:
  linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
  linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:48px 48px;opacity:.5}
.hero .wrap{position:relative;padding:46px 0 52px}
.breadcrumb{font-size:13px;color:#bcd3e8;margin-bottom:18px}
.breadcrumb a:hover{color:#fff;text-decoration:underline}
.hero h1{font-size:34px;line-height:1.3;font-weight:800;max-width:880px}
.hero .sub{margin-top:16px;font-size:16px;color:#dce8f3;max-width:820px}
.stat-banner{display:inline-flex;align-items:baseline;gap:14px;margin-top:24px;background:rgba(255,255,255,.1);
  border:1px solid rgba(255,255,255,.22);padding:12px 22px;border-radius:var(--radius-lg);backdrop-filter:blur(4px)}
.stat-banner .lab{font-size:13px;color:#bcd3e8}
.stat-banner .from{font-family:var(--font-num);font-size:26px;color:#fff;opacity:.85}
.stat-banner .arrow{color:var(--c-emphasis);font-size:22px}
.stat-banner .to{font-family:var(--font-num);font-size:30px;color:var(--c-emphasis);font-weight:800}
.hero .tags{margin-top:22px;display:flex;flex-wrap:wrap;gap:10px}
.hero .tags span{font-size:13px;background:rgba(0,163,180,.18);border:1px solid rgba(0,163,180,.5);
  color:#cdeef2;padding:5px 13px;border-radius:20px}

/* Section 通用 */
.section{padding:54px 0;background:#fff}
.section.alt{background:var(--c-bg-alt)}
.section-head{margin-bottom:30px}
.eyebrow{display:inline-block;font-size:13px;color:var(--c-accent);font-weight:700;letter-spacing:1px;
  padding:3px 12px;border:1px solid rgba(0,163,180,.4);border-radius:20px;margin-bottom:12px}
.section h2.sec{font-size:26px;color:var(--c-primary);font-weight:800}
.section .secd{color:var(--c-text-2);margin-top:8px;font-size:15px;max-width:760px}

/* 痛点 3 卡 */
.pain{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.pc{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius-lg);padding:22px 22px 22px 24px;position:relative;overflow:hidden}
.pc::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--c-emphasis)}
.pc .badge{display:inline-block;font-size:12px;color:#fff;background:var(--c-primary-light);padding:3px 10px;border-radius:6px;margin-bottom:12px}
.pc h3{font-size:18px;color:var(--c-text);margin-bottom:8px}
.pc p{color:var(--c-text-2);font-size:14px}

/* 能力 6 卡 */
.ability{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.ac{background:var(--c-bg-alt);border:1px solid var(--c-line);border-radius:var(--radius);padding:18px 18px 18px 56px;position:relative}
.ac .no{position:absolute;left:14px;top:16px;font-family:var(--font-num);font-size:22px;font-weight:800;color:var(--c-accent)}
.ac h3{font-size:16px;color:var(--c-primary);margin-bottom:6px}
.ac p{font-size:13.5px;color:var(--c-text-2)}
.trust{margin-top:22px;background:rgba(0,163,180,.08);border:1px dashed rgba(0,163,180,.5);border-radius:var(--radius);
  padding:14px 18px;color:var(--c-primary);font-size:14px;display:flex;gap:10px;align-items:center}
.trust b{color:var(--c-accent)}

/* 效果指标卡 */
.effect{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px}
.ec{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius-lg);padding:20px;position:relative}
.ec .m{font-size:14px;color:var(--c-text);font-weight:600}
.ec .nums{margin-top:10px;display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.ec .base{font-family:var(--font-num);font-size:15px;color:var(--c-text-2);text-decoration:line-through}
.ec .to{font-family:var(--font-num);font-size:26px;font-weight:800;color:var(--c-primary)}
.ec .cal{margin-top:8px;font-size:12px;color:var(--c-text-2);border-top:1px dashed var(--c-line);padding-top:8px}

/* 对话流演示（视频区） */
.video-sec{background:linear-gradient(180deg,#fff,#f7fafc)}
.chat{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius-lg);max-width:840px;margin:0 auto;
  box-shadow:0 10px 30px rgba(14,58,102,.08);overflow:hidden}
.chat .bar{background:var(--c-primary);color:#fff;padding:12px 18px;display:flex;align-items:center;justify-content:space-between;font-size:14px}
.chat .bar .dot{width:9px;height:9px;border-radius:50%;background:#36d399;display:inline-block;margin-right:8px}
.chat .body{height:430px;overflow-y:auto;padding:20px;background:var(--c-bg-alt)}
.bubble{display:flex;gap:10px;margin-bottom:16px;align-items:flex-end;opacity:0;transform:translateY(8px);animation:rise .35s forwards}
.bubble.show{opacity:1;transform:none}
@keyframes rise{to{opacity:1;transform:none}}
.bubble .av{width:34px;height:34px;border-radius:50%;flex:0 0 34px;display:flex;align-items:center;justify-content:center;font-size:13px;color:#fff;font-weight:700}
.bubble.user .av{background:var(--c-text-2)}
.bubble.wb .av{background:var(--c-accent)}
.bubble .txt{background:#fff;border:1px solid var(--c-line);border-radius:12px;padding:10px 14px;font-size:14.5px;max-width:640px;line-height:1.6}
.bubble.user{flex-direction:row-reverse}
.bubble.user .txt{background:#eef2f7;border-color:#dde5ee}
.typing{display:inline-flex;gap:4px;padding:6px 2px}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--c-text-2);opacity:.5;animation:blink 1s infinite}
.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,100%{opacity:.3}50%{opacity:1}}
.chat .ctrl{max-width:840px;margin:14px auto 0;text-align:center}
.btn-ghost{background:#fff;border:1px solid var(--c-primary);color:var(--c-primary);padding:8px 18px;border-radius:20px;font-size:13px;cursor:pointer}
.btn-ghost:hover{background:var(--c-primary);color:#fff}
.vsteps{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:22px;max-width:980px}
.vstep{background:#fff;border:1px solid var(--c-line);border-left:4px solid var(--c-accent);border-radius:8px;padding:12px 14px;font-size:13.5px;color:var(--c-text-2)}
.vstep b{color:var(--c-primary);display:block;margin-bottom:3px;font-size:12px}
.realnote{text-align:center;color:var(--c-text-2);font-size:13px;margin-top:14px}

/* 数据源 */
.data-card{display:grid;grid-template-columns:1.1fr 1fr;gap:28px;align-items:start;background:#fff;border:1px solid var(--c-line);border-radius:var(--radius-lg);padding:28px}
.data-card .dl{background:var(--c-bg-alt);border-radius:var(--radius);padding:22px;text-align:center}
.data-card .dl .ic{font-size:34px}
.data-card .dl h3{font-size:17px;color:var(--c-primary);margin:8px 0}
.data-card .dl p{font-size:13px;color:var(--c-text-2);margin-bottom:16px}
.btn-primary{display:inline-block;background:var(--c-primary);color:#fff;font-weight:700;padding:11px 26px;border-radius:24px;font-size:15px;transition:.2s}
.btn-primary:hover{background:var(--c-primary-light)}
.btn-accent{display:inline-block;background:var(--c-accent);color:#fff;font-weight:700;padding:11px 26px;border-radius:24px;font-size:15px;transition:.2s}
.btn-accent:hover{background:#0bbccf}
.btn-lg{padding:14px 34px;font-size:16px}
.fields{width:100%;border-collapse:collapse;font-size:13.5px}
.fields th,.fields td{border:1px solid var(--c-line);padding:8px 10px;text-align:left;vertical-align:top}
.fields th{background:var(--c-bg-alt);color:var(--c-primary);font-weight:700;width:38%}
.fields td{color:var(--c-text-2)}
.desc-box{margin-top:16px;background:rgba(232,163,61,.08);border:1px solid rgba(232,163,61,.4);border-radius:8px;padding:12px 14px;font-size:13px;color:var(--c-text)}

/* 三步上手 */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.st{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius);padding:20px;position:relative}
.st .n{font-family:var(--font-num);font-size:30px;color:var(--c-line);font-weight:800;position:absolute;right:16px;top:8px}
.st h3{color:var(--c-primary);font-size:16px;margin-bottom:6px}
.st p{font-size:13.5px;color:var(--c-text-2)}

/* 行业适配 */
.indus{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.ic{background:#fff;border:1px solid var(--c-line);border-radius:var(--radius-lg);overflow:hidden}
.ic .ph{height:150px;background:linear-gradient(135deg,var(--c-primary-light),var(--c-accent));position:relative;display:flex;align-items:flex-end;padding:14px}
.ic .ph .phtag{font-size:12px;color:#fff;background:rgba(0,0,0,.25);padding:3px 10px;border-radius:14px}
.ic .ibody{padding:16px 18px 20px}
.ic .ibody h3{font-size:17px;color:var(--c-primary);margin-bottom:8px}
.ic .ibody .scene{font-size:13.5px;color:var(--c-text-2);margin-bottom:10px}
.ic .ibody .gain{font-size:13.5px;color:var(--c-accent);font-weight:600}

/* 交付包 */
.pkg{background:var(--c-bg-alt);border:1px solid var(--c-line);border-radius:var(--radius-lg);padding:24px;text-align:center}
.pkg h3{color:var(--c-primary);font-size:18px;margin-bottom:8px}
.pkg p{color:var(--c-text-2);font-size:14px;margin-bottom:16px}

/* 三条规矩 + CTA */
.rules{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:26px}
.rule{background:var(--c-primary-deep);color:#fff;border-radius:var(--radius);padding:18px}
.rule b{color:var(--c-emphasis);display:block;margin-bottom:6px;font-size:15px}
.rule span{font-size:13.5px;color:#cfe0ef}
.cta-sec{background:linear-gradient(135deg,var(--c-primary-deep),var(--c-primary));color:#fff;text-align:center;padding:56px 0}
.cta-sec h2{font-size:28px;font-weight:800}
.cta-sec p{margin-top:12px;color:#cfe0ef;font-size:15px}
.cta-sec .btn-accent{margin-top:22px}

/* 页脚 */
.footer{background:#0a2238;color:#9fb6cc;font-size:13px;padding:34px 0}
.footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:20px}
.footer .fbrand{color:#fff;font-weight:700;font-size:16px;margin-bottom:8px}
.footer a{color:#9fb6cc}
.footer a:hover{color:#fff}
.footer .cols{display:flex;gap:40px;flex-wrap:wrap}
.footer .cols h4{color:#fff;font-size:13px;margin-bottom:10px}
.footer .cols a{display:block;margin-bottom:6px}

/* 响应式 */
@media(max-width:900px){
  .pain,.ability,.effect,.indus,.steps,.rules,.vsteps{grid-template-columns:1fr}
  .data-card{grid-template-columns:1fr}
  .mainnav .menu{display:none}
  .hero h1{font-size:26px}
}