:root{
  --ink:#12211f;
  --ink2:#3c4f4c;
  --ink3:#6b7d7a;
  --line:#dfe5e3;
  --bg:#f7f9f8;
  --card:#ffffff;
  --brand:#0b3b34;
  --brand2:#12695c;
  --accent:#b45309;
  --accent-bg:#fdf6ec;
  --go:#0f766e;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand2);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:980px;margin:0 auto;padding:0 22px}

/* header */
.site-head{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.logo{font-size:16px;font-weight:700;color:var(--brand);letter-spacing:-.2px;white-space:nowrap}
.logo span{color:var(--brand2);font-weight:400}
.nav{display:flex;gap:22px;font-size:14px;align-items:center}
.nav a{color:var(--ink2);white-space:nowrap}
.nav a:hover{color:var(--brand);text-decoration:none}
.nav a.cta{background:var(--brand);color:#fff;padding:8px 15px;border-radius:6px;font-weight:500}
.nav a.cta:hover{background:var(--brand2);text-decoration:none}
/* ---------- mobile menu ---------- */
.menu-btn{display:none;width:44px;height:44px;border:1px solid #c9d4d1;background:#fff;
  border-radius:8px;align-items:center;justify-content:center;flex-direction:column;
  gap:5px;cursor:pointer;padding:0;flex:0 0 auto}
.menu-btn span{display:block;width:18px;height:2px;background:var(--brand);border-radius:1px;
  transition:transform .18s ease,opacity .18s ease}
.menu-btn[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-btn[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-btn[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.mmenu{position:fixed;left:0;right:0;top:var(--hdr-h,64px);bottom:0;background:#fff;z-index:80;
  overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;
  padding-bottom:calc(32px + env(safe-area-inset-bottom));border-top:1px solid var(--line)}
.mmenu[hidden]{display:none}
.mmenu a{display:block;padding:12px 20px;font-size:15px;color:var(--ink);
  border-bottom:1px solid #f2f5f4;text-decoration:none}
.mmenu a:active{background:#f7f9f8}
.mmenu a.active{color:var(--brand);font-weight:600;background:#f4f7f6;
  box-shadow:inset 3px 0 0 var(--brand)}
.mmenu a.sub{font-size:13.8px;color:var(--ink2);padding:10px 20px}
.mmenu .mh{font-size:11px;letter-spacing:.7px;text-transform:uppercase;color:var(--ink3);
  padding:14px 20px 6px;font-weight:700;background:#fafbfb}
.mmenu a.mcta{margin:18px 20px 0;border:none;border-radius:8px;background:var(--brand);
  color:#fff;text-align:center;font-weight:500;padding:14px 22px}
body.menu-open{overflow:hidden}

/* 手机上：保留「Book a call」这一个转化入口，其余链接收进汉堡。
   全藏掉会让每篇文章页面在手机上都没有可见的行动按钮。 */
@media(max-width:820px){
  .nav{display:flex;gap:10px}
  .nav a:not(.cta){display:none}
  .nav a.cta{padding:9px 13px;font-size:13px}
  .menu-btn{display:flex}
}
@media(max-width:319px){
  .nav a.cta{display:none}
}

/* hero */
.hero{padding:68px 0 52px;background:var(--card);border-bottom:1px solid var(--line)}
.hero h1{margin:0 0 18px;font-size:38px;line-height:1.25;letter-spacing:-.8px;font-weight:700;color:var(--brand);max-width:760px}
.hero p.lede{font-size:18px;line-height:1.7;color:var(--ink2);max-width:660px;margin:0 0 28px}
.hero .acts{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.btn{display:inline-block;padding:12px 22px;border-radius:6px;font-size:15px;font-weight:500;border:1px solid transparent;cursor:pointer;font-family:inherit}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand2);text-decoration:none}
.btn-ghost{background:transparent;color:var(--brand);border-color:#b9c9c6}
.btn-ghost:hover{border-color:var(--brand);text-decoration:none}
@media(max-width:640px){
  .hero{padding:44px 0 36px}
  .hero h1{font-size:26px;letter-spacing:-.4px}
  .hero p.lede{font-size:16px}
}

/* sections */
section{padding:56px 0}
section.tight{padding:38px 0}
h2{font-size:24px;line-height:1.35;margin:0 0 14px;letter-spacing:-.3px;color:var(--brand)}
h3{font-size:17px;margin:26px 0 10px;color:var(--ink)}
p{margin:0 0 15px}
.sub{font-size:14px;color:var(--ink3)}
.sec-lede{font-size:16.5px;color:var(--ink2);max-width:680px;margin-bottom:26px}

/* cards */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:22px 20px}
.card h3{margin:0 0 8px;font-size:16px}
.card p{font-size:14px;line-height:1.65;color:var(--ink2);margin:0 0 10px}
.card .num{display:inline-flex;width:26px;height:26px;border-radius:50%;background:#e8efed;color:var(--brand);
  font-size:13px;font-weight:700;align-items:center;justify-content:center;margin-bottom:10px}

/* alert */
.alert{background:var(--accent-bg);border:1px solid #f0dcbb;border-left:4px solid var(--accent);
  border-radius:8px;padding:20px 22px;margin:0 0 22px}
.alert h3{margin:0 0 8px;color:#7a4d0c;font-size:16px}
.alert p{color:#6b4a12;font-size:14.5px;margin:0}
.alert p + p{margin-top:8px}

/* tables */
.tbl{width:100%;border-collapse:collapse;background:var(--card);font-size:14.5px;
  border:1px solid var(--line);border-radius:8px;overflow:hidden}
.tbl th,.tbl td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{background:#eef2f1;font-size:13px;font-weight:700;color:var(--ink2)}
.tbl tr:last-child td{border-bottom:none}
.tbl td.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
@media(max-width:640px){
  .tbl{font-size:13px}
  .tbl th,.tbl td{padding:9px 10px}
}

/* calculator */
.calc{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:start}
@media(max-width:760px){.calc{grid-template-columns:1fr;gap:20px}}
.field{margin-bottom:15px}
.field label{display:block;font-size:13.5px;font-weight:600;color:var(--ink2);margin-bottom:6px}
.field .hint{display:block;font-size:12px;color:var(--ink3);font-weight:400;margin-top:4px;line-height:1.5}
.field input,.field select{width:100%;padding:10px 12px;font-size:15px;font-family:inherit;
  border:1px solid #c9d4d1;border-radius:6px;background:#fff;color:var(--ink)}
.field input:focus,.field select:focus{outline:2px solid #9ec9c0;outline-offset:1px;border-color:var(--brand2)}
.field.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.field.row2 label{font-size:12.5px}
.result{background:var(--brand);color:#fff;border-radius:10px;padding:26px 24px;position:sticky;top:84px}
.result .big{font-size:40px;font-weight:700;letter-spacing:-1.2px;line-height:1.1;margin:0 0 2px}
.result .bigsub{font-size:13px;opacity:.72;margin:0 0 22px}
.result .row{display:flex;justify-content:space-between;gap:12px;padding:9px 0;
  border-bottom:1px solid rgba(255,255,255,.14);font-size:14px}
.result .row:last-of-type{border-bottom:none}
.result .row span:first-child{opacity:.78}
.result .row span:last-child{font-variant-numeric:tabular-nums;font-weight:500}
.result .total{display:flex;justify-content:space-between;margin-top:14px;padding-top:14px;
  border-top:1px solid rgba(255,255,255,.28);font-size:15px;font-weight:600}
.result .note{font-size:12px;opacity:.62;margin:18px 0 0;line-height:1.6}
@media(max-width:760px){.result{position:static}.result .big{font-size:32px}}

/* checklist */
.checks{list-style:none;padding:0;margin:0}
.checks li{background:var(--card);border:1px solid var(--line);border-radius:8px;
  padding:16px 18px 16px 48px;margin-bottom:10px;position:relative;font-size:14.5px;color:var(--ink2)}
.checks li::before{content:"";position:absolute;left:18px;top:18px;width:16px;height:16px;
  border:1.5px solid #b9c9c6;border-radius:3px}
.checks li b{display:block;color:var(--ink);font-size:15px;margin-bottom:4px}

/* steps */
.steps{counter-reset:s;list-style:none;padding:0;margin:0}
.steps li{counter-increment:s;position:relative;padding-left:44px;margin-bottom:18px;font-size:15px;color:var(--ink2)}
.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:28px;height:28px;
  border-radius:50%;background:#e8efed;color:var(--brand);font-size:13px;font-weight:700;
  display:flex;align-items:center;justify-content:center}
.steps li b{display:block;color:var(--ink);margin-bottom:3px}

/* footer */
footer{background:var(--brand);color:#c9dbd7;padding:44px 0 34px;margin-top:60px;font-size:13.5px}
footer .fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px;margin-bottom:28px}
@media(max-width:700px){footer .fgrid{grid-template-columns:1fr;gap:20px}}
footer .fbrand{color:#fff;font-weight:700;font-size:15px;margin-bottom:8px}
footer a{color:#c9dbd7}
footer a:hover{color:#fff}
footer .fhead{color:#fff;font-weight:600;margin-bottom:10px;font-size:13px;letter-spacing:.3px}
footer ul{list-style:none;padding:0;margin:0}
footer li{margin-bottom:7px}
footer .fbot{border-top:1px solid rgba(255,255,255,.16);padding-top:18px;font-size:12.5px;opacity:.7;line-height:1.7}

.grid-contact{display:grid;grid-template-columns:1.2fr 1fr;gap:16px}
@media(max-width:700px){.grid-contact{grid-template-columns:1fr}}

/* 图表容器：窄屏保持最小可读宽度，横向滚动而不是缩成糊 */
.figscroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.figscroll svg{min-width:560px}