/* S2 beiqinhilfe.com — DESIGN.md token（钴蓝/Barlow/4px 硬边，与 S1 明令区隔） */
@font-face{font-family:Barlow;font-style:normal;font-weight:400;font-display:swap;src:url(fonts/Barlow-400.woff2)format("woff2")}
@font-face{font-family:Barlow;font-style:normal;font-weight:500;font-display:swap;src:url(fonts/Barlow-500.woff2)format("woff2")}
@font-face{font-family:Barlow;font-style:normal;font-weight:600;font-display:swap;src:url(fonts/Barlow-600.woff2)format("woff2")}
@font-face{font-family:Barlow;font-style:normal;font-weight:700;font-display:swap;src:url(fonts/Barlow-700.woff2)format("woff2")}
@font-face{font-family:IBM Plex Mono;font-style:normal;font-weight:400;font-display:swap;src:url(fonts/IBMPlexMono-400.woff2)format("woff2")}
@font-face{font-family:IBM Plex Mono;font-style:normal;font-weight:500;font-display:swap;src:url(fonts/IBMPlexMono-500.woff2)format("woff2")}
@font-face{font-family:"Noto Sans";font-style:normal;font-weight:400;font-display:swap;src:url(fonts/NotoSans-400.woff2)format("woff2")}
@font-face{font-family:"Noto Sans";font-style:normal;font-weight:500;font-display:swap;src:url(fonts/NotoSans-500.woff2)format("woff2")}
@font-face{font-family:"Noto Sans";font-style:normal;font-weight:700;font-display:swap;src:url(fonts/NotoSans-700.woff2)format("woff2")}

:root{
  --base:#F2F3F4; --surface:#FFFFFF; --ink:#1A1E24; --ink-soft:#4A515C;
  --line:#DDE1E5; --accent:#1B4F9C; --accent-soft:#E6EDF7; --data:#143A70;
  --radius:4px; --shadow-hover:0 6px 20px rgba(27,79,156,.10);
  --f-display:Barlow,"Noto Sans",system-ui,sans-serif;
  --f-body:Barlow,"Noto Sans",system-ui,sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;font-family:var(--f-body);font-size:17px;line-height:1.6;color:var(--ink);background:var(--base)}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent)}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
.narrow{max-width:740px}
.mono{font-family:var(--f-mono)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.hidden{display:none}

/* header */
.site-head{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}
.head-in{display:flex;align-items:center;gap:26px;height:66px}
.brand{font-family:var(--f-display);font-weight:700;font-size:20px;color:var(--ink);text-decoration:none;letter-spacing:-.01em}
.brand span{color:var(--accent)}
.main-nav{display:flex;gap:20px;margin-left:auto}
.main-nav a{color:var(--ink-soft);text-decoration:none;font-weight:500;font-size:15.5px;padding:6px 2px;border-bottom:2px solid transparent}
.main-nav a:hover{color:var(--ink)}
.main-nav a[aria-current="page"]{color:var(--accent);border-bottom-color:var(--accent)}
.head-cta{white-space:nowrap}
.nav-toggle{display:none;background:none;border:0;width:44px;height:44px;padding:10px;cursor:pointer}
.nav-toggle span{display:block;height:2px;background:var(--ink);margin:5px 0}
.mobile-nav{display:none;flex-direction:column;gap:2px;padding:10px 24px 18px;border-bottom:1px solid var(--line);background:var(--surface)}
.mobile-nav a{padding:10px 0;color:var(--ink);text-decoration:none;font-weight:500}
.mobile-nav.open{display:flex}
@media (max-width:920px){.main-nav,.head-cta{display:none}.nav-toggle{display:block;margin-left:auto}}

/* buttons — 4px 方角、无阴影 */
.btn{display:inline-block;padding:12px 20px;border-radius:var(--radius);font-weight:600;font-size:15.5px;text-decoration:none;border:1.5px solid transparent;cursor:pointer;transition:background-color .2s,color .2s,border-color .2s,transform .15s}
.btn:active{transform:scale(.98)}
.btn:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.btn-acc{background:var(--accent);color:#fff}
.btn-acc:hover{background:#16417F}
.btn-ghost{border-color:var(--ink);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-inv{background:#fff;color:var(--accent)}
.btn-inv:hover{background:var(--accent-soft)}
.btn-wide{width:100%;text-align:center}

/* hero */
.hero{background:var(--surface);border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:44px;align-items:center;padding:64px 24px}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin:0 0 12px}
.hero h1{font-family:var(--f-display);font-size:clamp(29px,3.8vw,44px);line-height:1.12;letter-spacing:-.02em;margin:0 0 16px;overflow-wrap:break-word}
.lede{color:var(--ink-soft);font-size:17.5px;max-width:56ch;margin:0 0 24px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin:0}
.hero-visual .ph{aspect-ratio:16/11;background:#E9EDF2;border:1px dashed #B7C2CF;border-radius:6px;display:grid;place-items:center;text-align:center;color:#66758A;font-size:15px}
.hero-visual .ph span{font-family:var(--f-mono);font-size:12.5px}
@media (max-width:920px){.hero-grid{grid-template-columns:1fr;padding:44px 24px}}

/* facts band */
.band-facts{background:var(--ink)}
.fact-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;padding:34px 24px}
.fact .num{font-family:var(--f-display);font-weight:700;font-size:29px;margin:0;color:#fff;font-variant-numeric:tabular-nums}
.fact p:last-child{margin:2px 0 0;color:#AEB7C4;font-size:14.5px}
@media (max-width:920px){.fact-grid{grid-template-columns:repeat(2,1fr)}}

/* sections */
section{padding:60px 0}
.cats,.fam-zone,.page-head,.prose,.svc,.form-zone,.proc,.bando{background:var(--surface);border-bottom:1px solid var(--line)}
h2{font-family:var(--f-display);font-size:clamp(23px,2.8vw,31px);letter-spacing:-.01em;margin:0 0 14px}
.sec-lede{color:var(--ink-soft);max-width:62ch;margin:0 0 32px}
.page-head{padding:52px 0 40px}
.page-head.slim{padding:42px 0 32px}
.page-head h1{font-family:var(--f-display);font-size:clamp(27px,3.4vw,38px);line-height:1.15;margin:0 0 12px;overflow-wrap:break-word}
.crumb{font-size:13.5px;color:var(--ink-soft)}
.crumb .wrap{display:flex;gap:8px;flex-wrap:wrap;padding-top:16px}
.crumb a{color:var(--ink-soft);text-decoration:none}
.crumb a:hover{color:var(--accent)}
.crumb span[aria-hidden]{opacity:.5}
.crumb-cat{margin:0 0 8px}
.crumb-cat a{font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);text-decoration:none}

/* category cards */
.cat-cards{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:0;padding:0}
.cat-cards li a{display:flex;flex-direction:column;gap:6px;padding:22px;border:1px solid var(--line);border-radius:var(--radius);text-decoration:none;color:var(--ink);transition:border-color .2s,box-shadow .2s}
.cat-cards li a:hover{border-color:var(--accent);box-shadow:var(--shadow-hover)}
.cat-ico{width:32px;height:32px;background:var(--accent-soft);border:1px solid #C2D3EA}
.cat-name{font-family:var(--f-display);font-weight:600;font-size:18px}
.cat-meta{font-family:var(--f-mono);font-size:12.5px;color:var(--ink-soft)}
.cat-cards.big{grid-template-columns:repeat(2,1fr)}
.cat-cards.big h2{font-size:20px;margin:0}
.cat-cards.big p{margin:4px 0;color:var(--ink-soft);font-size:15px}
@media (max-width:1024px){.cat-cards{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.cat-cards,.cat-cards.big{grid-template-columns:1fr}}

/* family cards */
.fam-cards{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:0 0 24px;padding:0}
.fam-cards a{display:flex;flex-direction:column;padding:15px;border:1px solid var(--line);border-radius:var(--radius);text-decoration:none;color:var(--ink);transition:border-color .2s,box-shadow .2s}
.fam-cards a:hover{border-color:var(--accent);box-shadow:var(--shadow-hover)}
.fam-code{font-family:var(--f-mono);font-size:15px;color:var(--data);font-weight:500}
.fam-sub{font-size:13px;color:var(--ink-soft);margin-top:4px}
@media (max-width:1024px){.fam-cards{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.fam-cards{grid-template-columns:1fr}}

/* spec table — 德式硬边 */
.spec-table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:15.5px}
.spec-table th{text-align:left;font-size:12.5px;text-transform:uppercase;letter-spacing:.07em;color:var(--ink-soft);border-bottom:2px solid var(--ink);padding:8px 10px}
.spec-table td{border-bottom:1px solid var(--line);padding:10px;color:var(--data)}
.spec-table td.mono{font-family:var(--f-mono)}
.spec-table tr:hover td{background:#F6F8FA}
.src-note{font-size:13.5px;color:var(--ink-soft);border-left:3px solid var(--accent-soft);padding-left:12px}
.ph-block{height:280px;margin-top:24px;background:#E9EDF2;border:1px dashed #B7C2CF;border-radius:6px;display:grid;place-items:center;text-align:center;color:#66758A;font-size:14.5px}
.ph-block span{font-family:var(--f-mono);font-size:12px}

/* split */
.split{display:grid;grid-template-columns:1.4fr .6fr;gap:36px;align-items:start}
.split-cta{margin:6px 0 0}
.ticks{list-style:none;margin:0;padding:0}
.ticks li{padding:10px 0 10px 28px;position:relative;border-bottom:1px solid var(--line)}
.ticks li:last-child{border-bottom:0}
.ticks li::before{content:"";position:absolute;left:2px;top:19px;width:11px;height:5px;border-left:2.5px solid var(--accent);border-bottom:2.5px solid var(--accent);transform:rotate(-45deg)}
@media (max-width:920px){.split{grid-template-columns:1fr}}

/* bento */
.bento{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:minmax(110px,auto);gap:14px;padding:0 24px}
.bento .fact{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.bento .fact .num{color:var(--data);font-size:33px}
.bento .fact p:nth-child(2){color:var(--ink-soft)}
.bento .fact-sub{font-size:12.5px}
.bento .tall{grid-row:span 2}
.bento .wide{grid-column:span 2}
@media (max-width:920px){.bento{grid-template-columns:repeat(2,1fr)}.bento .wide{grid-column:span 2}}

/* steps */
.steps{list-style:none;counter-reset:s;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.steps li{counter-increment:s;border-top:3px solid var(--accent);padding-top:14px}
.steps li::before{content:counter(s,decimal-leading-zero);font-family:var(--f-mono);color:var(--accent);font-size:13px}
.steps h3{font-size:17px;margin:6px 0 8px}
.steps p{font-size:14.5px;color:var(--ink-soft);margin:0}
@media (max-width:920px){.steps{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.steps{grid-template-columns:1fr}}

/* CTA band */
.band-cta{background:var(--accent);padding:42px 0}
.cta-row{display:flex;align-items:center;justify-content:space-between;gap:22px;flex-wrap:wrap}
.cta-row h2{color:#fff;margin:0}
.band-why{background:var(--base)}

/* service */
.svc-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.svc-list h2{font-size:19px;margin:0 0 8px}
.svc-list p{margin:0;color:var(--ink-soft);font-size:15.5px}
@media (max-width:768px){.svc-list{grid-template-columns:1fr}}

/* form */
.quote-form{display:grid;gap:18px;background:var(--surface);padding:26px;border:1px solid var(--line);border-radius:var(--radius)}
.field{display:grid;gap:6px}
.field label{font-weight:600;font-size:15px}
.field input,.field textarea{font:inherit;padding:12px 13px;border:1.5px solid #C3CAD3;border-radius:var(--radius);background:#fff;color:var(--ink)}
.field input:focus-visible,.field textarea:focus-visible{outline:3px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.field .hint{margin:0;font-size:13px;color:var(--ink-soft)}
.field .err{margin:0;font-size:13.5px;color:#B3261E;font-weight:600}
.field.invalid input,.field.invalid textarea{border-color:#B3261E}
.req-note{margin:0;font-size:13px;color:var(--ink-soft)}

/* ratgeber */
.empty{border:1px dashed #C3CAD3;border-radius:var(--radius);padding:32px;text-align:center;color:var(--ink-soft)}
.empty p{margin:6px 0}
.post h1{font-family:var(--f-display);font-size:clamp(25px,3.2vw,36px);line-height:1.15}
.post h2{margin-top:36px}
blockquote{margin:24px 0;padding:4px 0 4px 18px;border-left:4px solid var(--accent);color:var(--ink-soft);font-size:18px}

/* footer */
.site-foot{background:var(--ink);color:#C0C8D4}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:34px;padding:52px 24px 30px}
.site-foot h2{color:#fff;font-size:14px;text-transform:uppercase;letter-spacing:.1em;margin:0 0 12px}
.foot-brand{font-family:var(--f-display);font-weight:700;font-size:19px;color:#fff;margin:0 0 10px}
.foot-list{list-style:none;margin:0;padding:0}
.foot-list a{color:#C0C8D4;text-decoration:none;font-size:15px;display:inline-block;padding:4px 0}
.foot-list a:hover{color:#fff}
.foot-fact{font-size:13.5px;max-width:38ch}
.foot-legal{border-top:1px solid #2C333D;padding:16px 24px;font-size:13px;display:flex;gap:18px;flex-wrap:wrap;align-items:center}
.foot-legal p{margin:0}
.foot-leg-link{color:#C0C8D4}
@media (max-width:920px){.foot-grid{grid-template-columns:1fr}}

/* ---------- 移动端补丁（置末：同权重下后出现者胜，覆盖 .btn 的 display） ---------- */
@media (max-width:920px){
  .main-nav,.head-cta{display:none !important}
  .nav-toggle{display:block;margin-left:auto}
  .bento{grid-template-columns:1fr}
  .bento .wide{grid-column:span 1}
  .bento,.fact-grid{padding-left:20px;padding-right:20px}
}

/* ---------- ⑤动效层（emil 定制缓动；js 门控；reduced-motion 全局降级） ---------- */
:root{
  --ease-out-strong:cubic-bezier(.23,1,.32,1);
  --ease-morph:cubic-bezier(.77,0,.175,1);
}
@media (hover:hover) and (pointer:fine){
  .btn-acc:hover{background:#16417F}
  .btn-ghost:hover{background:var(--ink);color:#fff}
  .btn-inv:hover{background:var(--accent-soft)}
  .cat-cards li a:hover{border-color:var(--accent);box-shadow:var(--shadow-hover)}
  .fam-cards a:hover{border-color:var(--accent);box-shadow:var(--shadow-hover)}
}
.btn{transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform 160ms var(--ease-out-strong)}
.btn:active{transform:scale(.97)}
.cat-cards li a{transition:border-color .2s ease,box-shadow .2s ease,transform 160ms var(--ease-out-strong)}
.cat-cards li a:active{transform:scale(.99)}
.fam-cards a{transition:border-color .2s ease,box-shadow .2s ease,transform 160ms var(--ease-out-strong)}
.fam-cards a:active{transform:scale(.99)}

/* S1 Split Text（hero 标题逐词入场） */
.js .hero h1.split-word span{display:inline-block;white-space:pre;opacity:0;transform:translateY(14px);animation:wordIn 480ms var(--ease-out-strong) forwards;animation-delay:calc(var(--i)*55ms + 80ms)}
@keyframes wordIn{to{opacity:1;transform:translateY(0)}}

/* S2 Fade-up 入场 */
.js .fade-up{opacity:0;transform:translateY(12px);animation:fadeUp 380ms var(--ease-out-strong) forwards;animation-delay:calc(var(--i,0)*60ms + 160ms)}
@keyframes fadeUp{to{opacity:1;transform:translateY(0)}}

/* S3 Spotlight 光斑（钴蓝版；hover 门控） */
@media (hover:hover) and (pointer:fine){
  .js .spotlight{position:relative;isolation:isolate;overflow:hidden}
  .js .spotlight::before{content:"";position:absolute;inset:0;z-index:-1;border-radius:inherit;opacity:0;transition:opacity .25s ease;pointer-events:none;
    background:radial-gradient(220px circle at var(--mx,50%) var(--my,50%),rgba(27,79,156,.09),transparent 65%)}
  .js .spotlight:hover::before{opacity:1}
}

/* 全局降级 */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;animation-delay:0ms !important;transition-delay:0ms !important}
  html{scroll-behavior:auto}
}

/* ---------- ⑦ CRO：表单状态 + 移动端粘性询盘条 ---------- */
.quote-form .sent-note{margin:0;padding:14px 16px;border:1.5px solid var(--accent);border-radius:8px;background:var(--accent-soft);color:var(--accent);font-weight:600;font-size:15px}
.quote-form .form-fb{margin:0;padding:12px 14px;border:1.5px solid #C7CDD4;border-radius:8px;background:#FBF3F2;color:#7A1F1A;font-size:14px}
.quote-form .form-note{margin:0;font-size:12.5px;color:var(--ink-soft);line-height:1.55}
.quote-form button[disabled]{opacity:.75;cursor:default}
.mcta{display:none}
@media (max-width:920px){
  body.has-mcta{padding-bottom:72px}
  body.has-mcta .mcta{display:block}
  body.has-mcta .site-foot{padding-bottom:84px}
  .mcta{display:none;position:fixed;left:0;right:0;bottom:0;z-index:60;background:#fff;border-top:1px solid var(--line);padding:10px 14px;box-shadow:0 -2px 14px rgba(20,25,30,.10)}
  .mcta a{display:block;width:100%;text-align:center;background:#1B4F9C;color:#fff;padding:13px 18px;border-radius:var(--radius);font-weight:600;font-size:16px;text-decoration:none}
  .mcta a:active{transform:scale(.99)}
  @supports (padding-bottom: env(safe-area-inset-bottom)){
    .mcta{padding-bottom:calc(10px + env(safe-area-inset-bottom))}
    body.has-mcta{padding-bottom:calc(72px + env(safe-area-inset-bottom))}
  }
}
@media (prefers-reduced-motion:reduce){.mcta{box-shadow:none}}