/* ============ Design Tokens · Mode A（引用《UI 设计底座 v1》） ============ */
:root{
  --bg-canvas:#F6F5F1; --bg-surface:#FFFFFF; --bg-raise:#F1EFEA;
  --line:#E6E2DB; --line-strong:#CFCAC1;
  --ink:#2A2825; --ink-body:#4E4A45; --ink-mut:#6E6A61;
  --brand:#1E4E73; --brand-strong:#17405F; --on-brand:#FFF;
  --brand-soft:#E7EEF4; --brand-line:#C7D6E2;
  --gold:#A67C1E; --gold-deep:#6B5310; --gold-soft:#F4ECD9;
  --ok:#3F7A4E; --ok-soft:#E6EFE7; --warn:#9A6B12; --warn-soft:#F6EED9; --bad:#A6422E; --bad-soft:#F6E8E3;
  --r-xs:4px; --r-sm:6px; --r-md:10px; --r-lg:14px;
  --sh-2:0 1px 2px rgba(42,40,37,.04), 0 6px 18px rgba(42,40,37,.05);
  --f-ui:"PingFang SC","HarmonyOS Sans SC","MiSans","Microsoft YaHei",system-ui,sans-serif;
  --f-mono:Consolas,ui-monospace,Menlo,monospace;
  --fs-display:clamp(54px,8vw,72px); --fs-h2:clamp(30px,4.5vw,40px);
  --fs-h3:clamp(22px,2.8vw,28px);
  --fs-body:15px; --fs-aux:13px; --fs-tag:12px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg-canvas);color:var(--ink-body);
  font-family:var(--f-ui);line-height:1.75;font-size:var(--fs-body);
  -webkit-font-smoothing:antialiased;padding-bottom:88px;
}
a{color:inherit}
svg.i{display:inline-block;fill:none;stroke:currentColor;stroke-width:1.75;stroke-linecap:round;stroke-linejoin:round;vertical-align:-0.16em;flex:none}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}

/* ============ 顶栏 ============ */
.topnav{position:sticky;top:0;z-index:50;background:var(--bg-surface);border-bottom:1px solid var(--line-strong);padding:8px 20px;display:flex;gap:8px;flex-wrap:wrap;align-items:center;overflow-x:auto}
.nav-brand{display:inline-flex;align-items:center;gap:9px;margin-right:10px;white-space:nowrap;color:var(--ink);font-weight:800;font-size:14.5px;letter-spacing:-.01em}
.topnav a.nav-link{font-size:var(--fs-aux);color:var(--ink-body);text-decoration:none;padding:5px 11px;border-radius:var(--r-sm);white-space:nowrap;transition:background .2s,color .2s}
.topnav a.nav-link:hover{background:var(--bg-raise);color:var(--ink)}
.topnav a.nav-link.cur{color:var(--ink);font-weight:700}
.nav-btn{white-space:nowrap;margin-left:auto;color:var(--ink);background:var(--gold-soft);border:1px solid rgba(166,124,30,.5);font-size:var(--fs-aux);font-weight:700;text-decoration:none;padding:5px 12px;border-radius:var(--r-sm)}
.nav-btn:hover{background:var(--bg-surface);border-color:var(--gold)}

/* ============ 布局骨架 ============ */
main{max-width:1120px;margin:0 auto;padding:20px 24px}
section{scroll-margin-top:64px;padding:48px 2px 48px;border-bottom:1px solid var(--line)}
section:last-of-type{border-bottom:none}
h1{font-size:var(--fs-display);font-weight:800;color:var(--ink);line-height:1.15;letter-spacing:-.02em}
h2{font-size:var(--fs-h2);font-weight:800;color:var(--ink);line-height:1.2;letter-spacing:-.015em}
.sub{color:var(--ink-body);font-size:var(--fs-body);margin-top:12px;line-height:1.75;max-width:45ch}
.sub b,.card p b{color:var(--ink);font-weight:700}
.mt16{margin-top:16px}.mt24{margin-top:24px}

/* ============ Hero ============ */
.hero{padding-top:56px}
.hero,#contact{background:radial-gradient(60% 50% at 50% 0%,rgba(30,78,115,.06),transparent 70%)}
.hero-acts{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}

/* ============ 按钮 ============ */
.btnx{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--brand);color:var(--on-brand);text-decoration:none;font-weight:700;padding:12px 22px;border-radius:8px;font-size:var(--fs-body);line-height:1.5;border:1px solid transparent;cursor:pointer;font-family:inherit;transition:background .2s,color .2s,border-color .2s,transform .2s}
.btnx:hover{background:var(--brand-strong)}
.btnx:active{transform:scale(.98)}
.btnx svg{color:currentColor}
.btnx.ghost{background:var(--bg-surface);color:var(--ink);border-color:var(--line-strong)}
.btnx.ghost:hover{background:var(--bg-raise);border-color:var(--line-strong);color:var(--ink-body)}
.btnx.gold{background:var(--gold);color:#FFF;border:none}
.btnx.gold:hover{background:var(--gold-deep);color:#FFF}
.btnx.sm{padding:9px 16px;font-size:14px}
.sticky-cta{position:fixed;left:50%;transform:translateX(-50%);bottom:12px;z-index:99;background:var(--gold);color:#FFF;text-decoration:none;font-weight:800;font-size:var(--fs-body);padding:13px 26px;border-radius:12px;border:none;white-space:nowrap;box-shadow:var(--sh-2);max-width:calc(100% - 32px);text-align:center}
.sticky-cta:hover{background:var(--gold-deep)}
.go-link{display:inline-flex;align-items:center;gap:4px;color:var(--ink);font-weight:700;text-decoration:underline;text-underline-offset:3px;font-size:13.5px}
.go-link:hover{color:var(--ink-body)}

/* ============ 行业分块：tab + 大方块 ============ */
.ind-tabs{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:24px}
.ind-tab{appearance:none;font-family:inherit;display:inline-flex;align-items:center;gap:7px;background:var(--bg-surface);border:1px solid var(--line-strong);color:var(--ink-body);font-size:14px;font-weight:600;padding:8px 14px;border-radius:8px;cursor:pointer;transition:background .2s,border-color .2s,color .2s,transform .2s;line-height:1.4;min-height:40px}
.ind-tab svg{color:var(--brand)}
.ind-tab:hover{border-color:var(--brand-line);background:var(--brand-soft);color:var(--ink)}
.ind-tab.active{background:var(--brand);border-color:var(--brand);color:#fff}
.ind-tab.active svg{color:#fff}
.ind-more{font-size:var(--fs-aux);color:var(--ink-mut);margin-left:4px}
.blk-stage{margin-top:16px;display:grid}
.blk{grid-area:1/1;background:var(--bg-surface);border:1px solid var(--line-strong);border-radius:var(--r-lg);padding:28px 28px 24px;box-shadow:var(--sh-2);opacity:0;transform:translateY(10px);visibility:hidden;pointer-events:none;transition:opacity .38s cubic-bezier(.16,1,.3,1),transform .38s cubic-bezier(.16,1,.3,1),visibility 0s linear .38s}
.blk.active{opacity:1;transform:none;visibility:visible;pointer-events:auto;transition-delay:0s,0s,0s}
.blk-head{display:flex;gap:16px;align-items:flex-start}
.blk-ic{flex:none;width:48px;height:48px;border-radius:10px;background:var(--brand-soft);border:1px solid var(--brand-line);color:var(--brand);display:flex;align-items:center;justify-content:center}
.blk-name{font-size:var(--fs-h3);font-weight:800;color:var(--ink);letter-spacing:-.012em;line-height:1.3;display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.blk-line{font-size:var(--fs-aux);color:var(--ink-mut);font-weight:700;letter-spacing:.02em}
.blk-hook{font-size:var(--fs-body);color:var(--ink-body);line-height:1.75;margin-top:4px;max-width:44ch}
/* 块内分组：组内紧、组间松，hairline 分隔，不用嵌套卡片 */
.blk-group{margin-top:28px;padding-top:24px;border-top:1px solid var(--line)}
.blk-label{font-size:var(--fs-tag);font-weight:700;color:var(--ink-mut);letter-spacing:.08em;margin-bottom:12px}
/* 营销链路：步骤无卡片，编号承载流程信息 */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px 12px}
.step .sno{font-family:var(--f-mono);font-variant-numeric:tabular-nums;font-size:11px;color:var(--ink-mut);letter-spacing:.09em;font-weight:700}
.step .si{color:var(--brand);margin:4px 0 2px}
.step b{display:block;font-size:14.5px;color:var(--ink);font-weight:700;margin-bottom:2px}
.step>span:last-child{font-size:13px;color:var(--ink-mut);line-height:1.6;display:block}
.step.key .si{color:var(--gold-deep)}
.alt-line{margin-top:14px;font-size:13.5px;color:var(--ink-mut);line-height:1.7}
.alt-line b{color:var(--ink-body);font-weight:700}
/* 内部自动化：图标条目，无容器 */
.autos{display:grid;grid-template-columns:repeat(3,1fr);gap:16px 12px}
.auto{display:flex;gap:10px;align-items:flex-start;min-width:0}
.auto .ai{flex:none;width:30px;height:30px;border-radius:var(--r-sm);background:var(--brand-soft);border:1px solid var(--brand-line);color:var(--brand);display:flex;align-items:center;justify-content:center}
.auto b{display:block;font-size:13.5px;color:var(--ink);font-weight:700}
.auto span{font-size:var(--fs-aux);color:var(--ink-body);line-height:1.6;display:block}
/* 投入档位 + 预估效果 */
.tier{font-size:14.5px;color:var(--ink-body);line-height:1.8}
.tier b{color:var(--ink);font-weight:700}
.data-line{margin-top:12px;font-size:13.5px;color:var(--ink-body);line-height:1.8}
.data-line b{color:var(--ink);font-weight:700}
/* 块尾 CTA */
.blk-cta{margin-top:28px;padding-top:20px;border-top:1px solid var(--line);display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.blk-cta span{font-size:var(--fs-aux);color:var(--ink-mut)}

/* ============ 合作模式 ============ */
.card{background:var(--bg-surface);border:1px solid var(--line-strong);border-radius:var(--r-lg);padding:18px;flex:1;min-width:230px;box-shadow:var(--sh-2)}
.card h3{font-size:var(--fs-h3);color:var(--ink);font-weight:800;letter-spacing:-.012em;display:flex;align-items:center;gap:9px;margin-bottom:6px}
.card h3 svg{color:var(--brand)}
.card p{font-size:14.5px;color:var(--ink-body);line-height:1.75}
.card.gld{background:var(--gold-soft);border:1px solid rgba(166,124,30,.5)}
.card.gld h3{color:var(--ink)}
.grid2{display:grid;grid-template-columns:repeat(12,1fr);gap:24px;margin-top:24px}
.grid2 .card{flex:none;grid-column:span 6}
.note{font-size:var(--fs-aux);color:var(--ink-mut);margin-top:16px;line-height:1.7;padding:10px 14px;background:var(--bg-raise);border-radius:var(--r-sm)}

/* ============ 证能力 bento ============ */
.proof{margin-top:24px;display:grid;grid-template-columns:repeat(12,1fr);gap:24px}
.ptile{background:var(--bg-surface);border:1px solid var(--line-strong);border-radius:var(--r-lg);padding:16px 18px 14px;display:flex;flex-direction:column;box-shadow:var(--sh-2)}
.ptile.w4{grid-column:span 4}
.ptile.w8{grid-column:span 8}
.tile-hd{display:flex;align-items:center;gap:8px;margin-bottom:8px}
.tchip{display:inline-flex;align-items:center;gap:6px;font-size:var(--fs-tag);font-weight:600;color:var(--ink-body);background:var(--brand-soft);border:1px solid var(--brand-line);padding:1px 9px;border-radius:var(--r-xs);letter-spacing:.03em}
.tchip svg{color:var(--brand)}
.tl{font-size:var(--fs-h3);font-weight:800;color:var(--ink);letter-spacing:-.012em;line-height:1.5}
.tb{font-size:14px;color:var(--ink-body);line-height:1.8;margin-top:8px;flex:1}
.tb .tk{color:var(--ink);font-weight:700;font-family:var(--f-mono);font-variant-numeric:tabular-nums;font-size:13.5px}
.tsrc{font-size:12.5px;color:var(--ink-mut);line-height:1.7;margin-top:12px;padding-top:8px;border-top:1px solid var(--line)}
.entry{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:24px}
.entry span{font-size:13.5px;color:var(--ink-mut)}

/* ============ 收尾 CTA / 页脚 ============ */
.footer{padding:28px 0 16px;color:var(--ink-mut);font-size:var(--fs-aux);text-align:center;line-height:1.9}
.wxline{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:16px;background:var(--bg-surface);border:1px solid var(--line-strong);border-radius:var(--r-lg);padding:14px 16px;box-shadow:var(--sh-2)}
.wxline .t{font-size:14px;color:var(--ink);font-weight:700}
.wxline .lab{color:var(--ink-mut);font-size:13.5px}
.wxnum{color:var(--ink);font-weight:800;font-family:var(--f-mono);font-variant-numeric:tabular-nums;font-size:14px;letter-spacing:.02em}
.copybtn{background:var(--bg-surface);border:1px solid var(--line-strong);color:var(--ink);border-radius:var(--r-sm);padding:6px 14px;font-size:14px;cursor:pointer;font-family:inherit;transition:background .2s,border-color .2s,color .2s;min-height:40px}
.copybtn:hover{background:var(--bg-raise)}
.copybtn.copied{color:var(--ok);border-color:var(--ok);background:var(--ok-soft)}

/* ===== 实验技法 A2·中西混排借力：超大 mono ghost 段号（仅数字字形张力，非文案） ===== */
.sec{position:relative}
.sec-no,.blk-no{position:absolute;font-family:var(--f-mono);font-variant-numeric:tabular-nums;font-weight:700;letter-spacing:-.05em;line-height:1;pointer-events:none;user-select:none;-webkit-text-stroke:1.5px rgba(42,40,37,.15);color:transparent;z-index:0}
.sec-no{font-size:clamp(128px,17vw,200px);top:2px;right:-4px}
.blk-no{font-size:clamp(80px,11.5vw,124px);top:10px;right:14px;-webkit-text-stroke-width:1.25px}
.blk{position:relative}
.sec h2,.sec .sub{position:relative;z-index:1}
.blk-head{position:relative;z-index:1}
@media(max-width:699px){.sec-no{display:none}}
@media(max-width:559px){.blk-no{display:none}}

/* ===== 实验技法 A4·艺术指导几何插画 hero（纯 inline SVG，单文件离线） ===== */
.hero-grid{display:grid;gap:34px;align-items:center;margin-top:18px}
.hero-art{width:min(100%,500px)}
.hero-art svg{display:block;width:100%;height:auto}
.hero-art{--cb:cubic-bezier(.4,0,.2,1)}
.eco{opacity:.55}
@keyframes ecoPulse{0%,100%{opacity:.25}50%{opacity:.95}}
@keyframes ecoIn{from{opacity:.12}to{opacity:.55}}
@keyframes radIn{from{opacity:.18;transform:translate(20px,-14px)}to{opacity:1;transform:none}}
@keyframes flyT{from{opacity:.18;transform:translate(10px,-26px)}to{opacity:1;transform:none}}
@keyframes flyL{from{opacity:.18;transform:translate(-34px,0)}to{opacity:1;transform:none}}
@keyframes flyB{from{opacity:.18;transform:translate(3px,26px)}to{opacity:1;transform:none}}
@keyframes lnIn{from{opacity:.15}to{opacity:1}}
@keyframes mgPop{from{opacity:.15}to{opacity:1}}
@keyframes spinIn{from{opacity:.15;transform:translateY(7px)}to{opacity:1;transform:none}}
@keyframes sdIn{from{opacity:.15;transform:translateX(-16px)}to{opacity:1;transform:none}}
@keyframes blIn{from{opacity:.12}to{opacity:1}}
@keyframes barUp{from{opacity:.15;transform:translateY(22px)}to{opacity:1;transform:none}}
@keyframes gdDrop{from{opacity:.12;transform:translateY(-26px)}to{opacity:1;transform:none}}
@keyframes dropIn{from{opacity:.12}to{opacity:1}}
@keyframes gFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-5px)}}
.hero-art .gfloat,.hero-art .rad,.hero-art .inp-a,.hero-art .inp-b,.hero-art .inp-c,.hero-art .lnin,
.hero-art .mg,.hero-art .spin,.hero-art .sd0,.hero-art .sd1,.hero-art .sd2,.hero-art .sd3,
.hero-art .bline,.hero-art .b1,.hero-art .b2,.hero-art .b3,.hero-art .drops,.hero-art .gd,.hero-art .eco{
  transform-box:fill-box;transform-origin:center}
@media (prefers-reduced-motion:no-preference){
  .hero-art .gfloat{animation:gFloat 12s ease-in-out 3.5s infinite}
  .hero-art .rad{animation:radIn 1.8s var(--cb) .05s backwards}
  .hero-art .inp-a{animation:flyT 1.5s var(--cb) .1s backwards}
  .hero-art .inp-b{animation:flyL 1.5s var(--cb) .22s backwards}
  .hero-art .inp-c{animation:flyB 1.5s var(--cb) .34s backwards}
  .hero-art .lnin{animation:lnIn 1.7s var(--cb) .8s backwards}
  .hero-art .mg{animation:mgPop 1.4s var(--cb) .9s backwards}
  .hero-art .spin{animation:spinIn 1.6s var(--cb) 1s backwards}
  .hero-art .sd0{animation:sdIn 1.4s var(--cb) .95s backwards}
  .hero-art .sd1{animation:sdIn 1.4s var(--cb) 1.08s backwards}
  .hero-art .sd2{animation:sdIn 1.4s var(--cb) 1.21s backwards}
  .hero-art .sd3{animation:sdIn 1.4s var(--cb) 1.34s backwards}
  .hero-art .bline{animation:blIn 1s var(--cb) 1.6s backwards}
  .hero-art .b1{animation:barUp 1.1s var(--cb) 1.9s backwards}
  .hero-art .b2{animation:barUp 1.1s var(--cb) 2s backwards}
  .hero-art .b3{animation:barUp 1.1s var(--cb) 2.1s backwards}
  .hero-art .drops{animation:dropIn .8s var(--cb) 2.15s backwards}
  .hero-art .eco{animation:ecoIn 1s var(--cb) 2.3s backwards,ecoPulse 5.5s ease-in-out 3.5s infinite}
  .hero-art .gd{animation:gdDrop .95s var(--cb) 2.3s backwards}
}
@media (prefers-reduced-motion:reduce){
  .hero-art *{animation:none!important}
}
@media(min-width:980px){
  .hero-grid{grid-template-columns:minmax(0,1fr) 400px;gap:56px}
  .hero-art{width:100%;max-width:none;justify-self:end}
}
@media(max-width:979px){
  .hero-art{margin:6px auto 0}
}

/* ============ 精修档：列间竖 hairline（≥760px）/ 入场动效 / 纸感噪点 ============ */
@media(min-width:760px){
  .steps .step{border-left:1px solid var(--line);padding-left:14px}
  .steps .step:first-child{border-left:none;padding-left:0}
  .autos .auto{border-left:1px solid var(--line);padding-left:14px}
  .autos .auto:first-child{border-left:none;padding-left:0}
}
.reveal{opacity:0;transform:translateY(12px);transition:opacity .6s cubic-bezier(.16,1,.3,1),transform .6s cubic-bezier(.16,1,.3,1)}
.reveal.in{opacity:1;transform:none}
.grain{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;opacity:.04;z-index:120}

/* ============ 多页拆分：翻页器 / 下一页引导 ============ */
.pager{position:fixed;right:14px;bottom:72px;z-index:98;display:flex;align-items:center;background:var(--bg-surface);border:1px solid var(--line-strong);border-radius:999px;box-shadow:var(--sh-2)}
.pager button{appearance:none;border:none;background:transparent;font-family:inherit;color:var(--ink);width:36px;height:42px;cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:999px}
.pager button:hover:not(:disabled){background:var(--bg-raise)}
.pager button:disabled{color:var(--line-strong);cursor:default}
.pager .pg-no{font-family:var(--f-mono);font-variant-numeric:tabular-nums;font-size:12px;color:var(--ink-mut);padding:0 5px;font-weight:700;letter-spacing:.04em}
.next-cta{margin-top:28px;padding-top:22px;border-top:1px solid var(--line);display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.next-cta .nx-lab{font-size:13px;color:var(--ink-mut)}

/* ============ 响应式 ============ */
@media(max-width:920px){
  .ptile.w4,.ptile.w8{grid-column:1/-1}
}
@media(max-width:700px){
  .grid2 .card{grid-column:span 12}
  .autos{grid-template-columns:1fr}
  .blk{padding:20px 18px 18px}
  .blk-head{flex-direction:column;gap:12px}
  .sticky-cta{font-size:14px;padding:12px 18px;white-space:normal;width:92%;max-width:92%}
  main{padding:16px 16px}
  section{padding:40px 0 38px}
  .hero{padding-top:40px}
  .pager{bottom:96px}
}
@media(max-width:480px){
  .steps{grid-template-columns:1fr 1fr}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .blk{transition:none}
  .btnx,.sticky-cta,.copybtn,.ind-tab{transition:none}
  .reveal{transition:none;opacity:1;transform:none}
}