:root{
  --bg:#F5FAFF;--ink:#23262B;--ink2:#5A6270;--blue:#1570EF;--coral:#FA5046;--yellow:#FFD400;
  --card:#FFF;--line:#DCE6F7;--line2:#EAF1FC;--blueSoft:#EAF2FE;--coralSoft:#FFF0EE;--yellowSoft:#FFF9DB;
  --r:20px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:var(--blue)}
.wrap{max-width:1140px;margin:0 auto;padding:0 24px}
section{padding:76px 0}
.mono{font-family:ui-monospace,"SF Mono",Consolas,monospace}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:ui-monospace,"SF Mono",Consolas,monospace;font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);border:1.5px solid var(--blue);border-radius:999px;padding:6px 16px;background:#fff}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--coral)}
h1,h2,h3{font-weight:800;line-height:1.25;letter-spacing:.01em}
h1{font-size:clamp(32px,4.8vw,54px)}
h2{font-size:clamp(24px,3.2vw,36px)}
.lead{color:var(--ink2);font-size:17px}
.center{text-align:center}
.center .lead{margin:16px auto 0;max-width:660px}
.sec-head{margin-bottom:44px}
.sec-head.center{display:flex;flex-direction:column;align-items:center;gap:14px}
.hl{background:linear-gradient(transparent 62%,var(--yellow) 62%)} /* 荧光笔强调 */
/* ── 共享导航 ── */
.nav{position:sticky;top:0;z-index:60;background:rgba(245,250,255,.88);backdrop-filter:blur(12px);border-bottom:1px solid var(--line2)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;text-decoration:none;color:var(--ink)}
.brand em{font-style:normal;color:var(--coral)}
.brand small{font-family:ui-monospace,Consolas,monospace;font-size:10px;letter-spacing:.16em;color:var(--ink2);font-weight:400;border-left:1px solid var(--line);padding-left:10px}
.nav-links{display:flex;gap:4px;align-items:center}
.nav-links a{font-size:14.5px;font-weight:600;color:var(--ink2);text-decoration:none;padding:8px 14px;border-radius:999px}
.nav-links a:hover{color:var(--ink);background:#fff}
.nav-links a.on{color:var(--blue);background:var(--blueSoft)}
.nav-links a.cta{color:#fff;background:var(--ink);font-weight:700}
.nav-links a.cta:hover{background:var(--blue)}
.burger{display:none;background:none;border:none;cursor:pointer;padding:8px}
.burger span{display:block;width:22px;height:2.5px;background:var(--ink);margin:5px 0;border-radius:2px}
/* ── 跑马灯 ── */
.marquee{background:var(--coral);color:#fff;overflow:hidden;white-space:nowrap;padding:10px 0}
.marquee-track{display:inline-flex;animation:mq 30s linear infinite}
.marquee span{font-weight:700;font-size:14px;letter-spacing:.06em;padding:0 14px}
.marquee i{font-style:normal;opacity:.55}
@keyframes mq{to{transform:translateX(-50%)}}
/* ── 按钮 ── */
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:999px;padding:14px 28px;font-weight:700;font-size:15px;text-decoration:none;border:2px solid transparent;transition:transform .15s ease,box-shadow .15s ease}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 10px 22px -10px rgba(21,112,239,.55)}
.btn-dark{background:var(--ink);color:#fff}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--ink)}
/* ── 卡片 / 通用 ── */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r)}
.stat b{display:block;font-size:clamp(30px,3.6vw,44px);font-weight:800;line-height:1.1;color:var(--blue)}
.stat span{font-size:13px;color:var(--ink2)}
/* ── 页脚 ── */
footer{background:var(--ink);color:#AAB2BF;margin-top:48px}
.foot-top{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px;padding:56px 0 36px}
.foot-top b{color:#fff;font-size:17px;display:block;margin-bottom:12px}
.foot-top a{display:block;color:#AAB2BF;text-decoration:none;font-size:14px;padding:4px 0}
.foot-top a:hover{color:#fff}
.foot-brand p{font-size:14px;line-height:1.9;max-width:380px;margin-top:10px}
.foot-legal{border-top:1px solid #3A4150;padding:22px 0 30px;font-size:12.5px;color:#7B8494;line-height:2}
.foot-legal a{color:#7B8494}
/* ── 跳绳分隔符 ── */
.rope-divider{display:block;margin:0 auto;width:220px;height:36px}
/* ── 响应式 ── */
@media(max-width:920px){
  section{padding:56px 0}
  .foot-top{grid-template-columns:1fr;gap:26px;padding:44px 0 28px}
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:12px 20px 20px;border-bottom:1px solid var(--line);box-shadow:0 20px 30px -20px rgba(35,38,43,.25)}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 14px;font-size:16px}
  .burger{display:block}
}