/* 缘先生官网 V4。在 V3 基础上：去掉滚动字幕条；正文区改成米白纸色，只保留首屏、人与 AI、联系三段深色；
   新增数字条、合作方式、适合谁。没有脚本或开启"减少动态效果"时，全部内容直接可见。 */
:root{
  --seal:#B5382C;
  --f:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --f-serif:"Songti SC","STSong","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --ease:cubic-bezier(.2,.7,.1,1);
}
/* 两套底色：深色段（首屏、人与 AI、联系、页脚）和浅色段（其余） */
.dark,body{
  --bg:#252833; --card:#2F3340; --card-2:#2A2D39; --line:rgba(241,224,186,.16);
  --ink:#F5F0E6; --ink-2:#BDB9B0; --head:#EFDCAF; --gold:#EBD5A3; --gold-2:#CDAE6A; --on-gold:#211B0C;
  color:var(--ink);
}
.light{
  --bg:#F7F2E8; --card:#FFFDF8; --card-2:#FBF6EC; --line:rgba(110,85,40,.16);
  --ink:#2B2720; --ink-2:#6F685C; --head:#2B2720; --gold:#9C7228; --gold-2:#B8924A; --on-gold:#FFF9EC;
  color:var(--ink);
}
.alt{--bg:#F0E8D9}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#252833;font-family:var(--f);font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
.wrap{max-width:1120px;margin:0 auto;padding-inline:22px}
h1,h2,h3{margin:0;font-family:var(--f-serif);font-weight:900;line-height:1.3;text-wrap:balance}
p{margin:0}
a{color:var(--gold)}
a:focus-visible,button:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
section{padding:110px 0;position:relative;background:var(--bg)}
.kicker{display:flex;align-items:center;gap:12px;font-size:13px;letter-spacing:.3em;color:var(--gold)}
.kicker::before{content:"";width:28px;height:1px;background:var(--gold)}
h2{font-size:clamp(28px,4.2vw,46px);color:var(--head);margin-top:14px;letter-spacing:.04em}
.sub{color:var(--ink-2);margin-top:14px;max-width:36em}

/* 滚动进度条 */
.bar{position:fixed;inset:0 0 auto 0;height:2px;z-index:50;background:linear-gradient(90deg,var(--seal),#EBD5A3);transform-origin:0 50%;transform:scaleX(0)}

/* 顶栏：滚动后变毛玻璃 */
.top{position:fixed;inset:0 0 auto 0;z-index:40;transition:background .4s,border-color .4s;border-bottom:1px solid transparent}
.top.solid{background:rgba(37,40,51,.8);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-color:var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;padding-block:16px}
.brand{display:inline-flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none}
.brand img{width:36px;height:36px;transition:transform .6s var(--ease)}
.brand:hover img{transform:rotate(-8deg) scale(1.08)}
.brand b{font-family:var(--f-serif);font-size:20px;letter-spacing:.2em}
.nav{display:flex;gap:26px}
.nav a{position:relative;color:var(--ink-2);text-decoration:none;font-size:14px;letter-spacing:.08em;padding:4px 0}
.nav a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--gold);transform:scaleX(0);transform-origin:100% 50%;transition:transform .35s var(--ease)}
.nav a:hover{color:var(--gold)}
.nav a:hover::after{transform:scaleX(1);transform-origin:0 50%}

/* 首屏：比 V3 提亮，暖光更大 */
.hero{position:relative;min-height:92svh;display:flex;align-items:center;overflow:hidden;padding:130px 0 90px;
  background:radial-gradient(900px 640px at 80% 34%,rgba(214,96,64,.30),transparent 70%),radial-gradient(760px 520px at 8% 96%,rgba(70,96,170,.42),transparent 65%),radial-gradient(600px 400px at 46% 0%,rgba(235,213,163,.10),transparent 70%),linear-gradient(180deg,#30343F,#262935)}
#net{position:absolute;inset:0;width:100%;height:100%;z-index:0}
.glyph{position:absolute;right:-3%;top:50%;width:min(58vw,640px);transform:translate3d(0,-50%,0);z-index:0;pointer-events:none;will-change:transform}
.glyph text{font-family:var(--f-serif);font-weight:900;font-size:300px;fill:rgba(235,213,163,.035);stroke:rgba(235,213,163,.45);stroke-width:1;stroke-dasharray:2600;stroke-dashoffset:0}
.hero .wrap{position:relative;z-index:1;width:100%}
.hero .kicker{color:var(--gold-2)}
.hero h1{font-size:clamp(42px,7.4vw,90px);letter-spacing:.06em;margin-top:22px}
.hero h1 .ln{display:block;overflow:hidden;padding-bottom:.06em}
.hero h1 .ln i{display:block;font-style:normal}
.hero h1 .ln:nth-child(2) i{background:linear-gradient(100deg,#CDAE6A 0%,#FBEDC9 28%,#CDAE6A 50%,#FBEDC9 72%,#CDAE6A 100%);background-size:220% 100%;-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{margin-top:30px;max-width:30em;color:#D2CEC5;font-size:18px}
.hero .lead b{color:var(--ink);font-weight:600}
.cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:38px}
.btn{position:relative;overflow:hidden;display:inline-flex;align-items:center;gap:8px;padding:14px 28px;font-weight:700;text-decoration:none;font-size:15px;letter-spacing:.14em;border-radius:2px;transition:transform .3s var(--ease),box-shadow .3s}
.btn.main{background:var(--gold);color:var(--on-gold)}
.btn.main::after{content:"";position:absolute;inset:0;background:linear-gradient(105deg,transparent 35%,rgba(255,255,255,.75) 50%,transparent 65%);transform:translateX(-120%)}
.btn.main:hover{transform:translateY(-2px);box-shadow:0 14px 34px -12px rgba(235,213,163,.55)}
.btn.main:hover::after{transform:translateX(120%);transition:transform .7s var(--ease)}
.btn.ghost{color:var(--gold);border:1px solid var(--gold-2)}
.btn.ghost:hover{background:rgba(235,213,163,.1);transform:translateY(-2px)}
.scroll{position:absolute;left:50%;bottom:26px;z-index:1;width:1px;height:46px;background:linear-gradient(#CDAE6A,transparent);transform-origin:50% 0}

/* 数字条（替代 V3 的滚动字幕） */
.stats{padding:0;background:var(--bg)}
.stats .wrap{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));transform:translateY(-54px);background:var(--card);box-shadow:0 30px 60px -36px rgba(60,40,10,.45);border:1px solid var(--line)}
.stat{padding:30px 26px 28px;border-left:1px solid var(--line)}
.stat:first-child{border-left:0}
.stat b{display:block;font-family:var(--f-serif);font-weight:900;font-size:clamp(34px,4vw,48px);line-height:1.1;color:var(--gold)}
.stat b small{font-size:.5em;margin-left:4px;color:var(--ink)}
.stat span{display:block;margin-top:8px;color:var(--ink-2);font-size:14px;line-height:1.6}

/* 三个词：光斑跟随 */
#believe{padding-top:56px}
.three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:48px}
.spot{position:relative;overflow:hidden;background:var(--card);border:1px solid var(--line);padding:40px 32px;transition:transform .5s var(--ease),border-color .4s,box-shadow .5s}
.spot::before{content:"";position:absolute;inset:0;background:radial-gradient(260px circle at var(--mx,50%) var(--my,50%),rgba(205,174,106,.2),transparent 65%);opacity:0;transition:opacity .4s}
.spot:hover{transform:translateY(-6px);border-color:var(--gold-2);box-shadow:0 26px 50px -30px rgba(80,55,15,.5)}
.spot:hover::before{opacity:1}
.spot > *{position:relative}
.spot em{font-style:normal;font-family:var(--f-serif);font-size:64px;line-height:1;color:transparent;-webkit-text-stroke:1px var(--gold-2)}
.spot h3{font-size:30px;margin:16px 0 12px;letter-spacing:.1em;color:var(--head)}
.spot p{color:var(--ink-2);font-size:15px}
.motto{margin-top:46px;display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;font-family:var(--f-serif);font-size:20px;letter-spacing:.24em;color:var(--ink)}
.motto span{color:var(--ink-2);font-family:var(--f);font-size:13px;letter-spacing:.2em}
.motto i{width:7px;height:7px;background:var(--seal);transform:rotate(45deg)}

/* 业务 */
.svc{margin-top:44px}
.svc article{position:relative;display:grid;grid-template-columns:100px minmax(0,1fr) minmax(0,1fr);gap:28px;padding:36px 0;border-top:1px solid var(--line);align-items:start;transition:padding-left .5s var(--ease)}
.svc article:last-child{border-bottom:1px solid var(--line)}
.svc article::before{content:"";position:absolute;left:0;top:-1px;width:100%;height:1px;background:var(--gold);transform:scaleX(0);transform-origin:0 50%;transition:transform .7s var(--ease)}
.svc article:hover{padding-left:16px}
.svc article:hover::before{transform:scaleX(1)}
.svc .no{font-family:var(--f-serif);font-size:48px;font-weight:900;color:var(--gold-2);line-height:1}
.svc h3{font-size:25px;letter-spacing:.06em;color:var(--head)}
.svc p{color:var(--ink-2);font-size:15px;margin-top:6px}
.svc ul{margin:0;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:8px}
.svc li{border:1px solid var(--line);background:var(--card);padding:3px 12px;font-size:13px;color:var(--gold);letter-spacing:.05em}

/* 合作方式：四步，横线随进场画出 */
.steps{position:relative;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;margin-top:56px;padding:0;list-style:none}
.steps::before{content:"";position:absolute;left:22px;right:22px;top:22px;height:1px;background:var(--gold-2);transform-origin:0 50%}
.steps li{position:relative}
.steps .n{position:relative;display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:var(--bg);border:1px solid var(--gold-2);font-family:var(--f-serif);font-weight:900;color:var(--gold)}
.steps li:last-child .n{background:var(--seal);border-color:var(--seal);color:#FFF6E6}
.steps h3{font-size:24px;margin-top:22px;letter-spacing:.1em;color:var(--head)}
.steps p{color:var(--ink-2);font-size:15px;margin-top:8px}

/* 人与 AI */
.apc{background:radial-gradient(700px 420px at 90% 10%,rgba(214,96,64,.16),transparent 70%),var(--bg)}
.apc .grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:52px;align-items:center}
.apc .big{font-family:var(--f-serif);font-size:clamp(21px,2.5vw,27px);line-height:1.75;margin-top:22px}
.apc .big b{color:var(--gold)}
.apc ol{margin:24px 0 0;padding:0;list-style:none;display:grid;gap:10px;color:var(--ink-2);font-size:15px}
.apc ol li{padding-left:20px;position:relative}
.apc ol li::before{content:"";position:absolute;left:0;top:.9em;width:10px;height:1px;background:var(--gold-2)}
.org{width:100%;height:auto;display:block}
.org .wire{fill:none;stroke:rgba(235,213,163,.3);stroke-width:1}
.org .flow{fill:none;stroke:var(--gold);stroke-width:1.4;stroke-dasharray:6 18;animation:flow 1.6s linear infinite}
.org .box{fill:var(--card);stroke:rgba(235,213,163,.32)}
.org .boss{fill:rgba(181,56,44,.2);stroke:var(--gold-2)}
.org text{font-family:var(--f);fill:var(--ink);font-size:14px;text-anchor:middle}
.org .t2{fill:var(--ink-2);font-size:11px}
.org .tb{font-family:var(--f-serif);fill:var(--gold);font-size:18px;letter-spacing:.14em}
.org .dot{fill:var(--gold)}
.org .node{animation:pulse 3.6s var(--ease) infinite}
@keyframes flow{to{stroke-dashoffset:-48}}
@keyframes pulse{0%,100%{opacity:.82}50%{opacity:1}}

/* 作品：只有抽象示意，没有合作方的名称和画面 */
.works{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:48px}
.work{background:var(--card);border:1px solid var(--line);transition:transform .5s var(--ease),border-color .4s,box-shadow .5s}
.work:hover{transform:translateY(-6px);border-color:var(--gold-2);box-shadow:0 26px 50px -30px rgba(80,55,15,.5)}
.work svg{display:block;width:100%;height:auto;background:linear-gradient(160deg,#2E3240,#252833);border-bottom:1px solid var(--line)}
.work div{padding:26px 26px 30px}
.work .tag{font-size:12px;color:var(--gold);letter-spacing:.2em}
.work h3{font-size:22px;margin-top:8px;letter-spacing:.05em;color:var(--head)}
.work p{color:var(--ink-2);margin-top:10px;font-size:15px}
.note{margin-top:26px;color:var(--ink-2);font-size:14px;display:flex;gap:10px;align-items:center}
.note::before{content:"";flex:0 0 8px;height:8px;background:var(--seal);transform:rotate(45deg)}
.ill .s{stroke:rgba(235,213,163,.55);stroke-width:2;fill:none;stroke-linecap:round}
.ill .g{stroke:#EBD5A3;stroke-width:2;fill:none;stroke-linecap:round;stroke-linejoin:round}
.ill .f{fill:rgba(235,213,163,.12);stroke:rgba(235,213,163,.3)}
.ill .w{stroke-dasharray:140;stroke-dashoffset:140;animation:write 5s var(--ease) infinite}
.ill .w2{animation-delay:.5s}.ill .w3{animation-delay:1s}.ill .w4{animation-delay:1.5s}
.ill .ck{stroke-dasharray:30;stroke-dashoffset:30;animation:tick 5s var(--ease) infinite}
.ill .ck2{animation-delay:.5s}.ill .ck3{animation-delay:1s}
.ill .wave rect{fill:#CDAE6A;transform-box:fill-box;transform-origin:50% 50%;animation:wave 1.2s ease-in-out infinite}
.ill .bars rect{fill:#CDAE6A;transform-box:fill-box;transform-origin:50% 100%;animation:grow 4.5s var(--ease) infinite}
.ill .trend{stroke-dasharray:300;stroke-dashoffset:300;animation:draw 4.5s var(--ease) infinite}
@keyframes write{0%{stroke-dashoffset:140}30%,85%{stroke-dashoffset:0}100%{stroke-dashoffset:140}}
@keyframes tick{0%,40%{stroke-dashoffset:30}55%,88%{stroke-dashoffset:0}100%{stroke-dashoffset:30}}
@keyframes wave{0%,100%{transform:scaleY(.35)}50%{transform:scaleY(1)}}
@keyframes grow{0%{transform:scaleY(.05)}35%,85%{transform:scaleY(1)}100%{transform:scaleY(.05)}}
@keyframes draw{0%,25%{stroke-dashoffset:300}60%,88%{stroke-dashoffset:0}100%{stroke-dashoffset:300}}

/* 适合谁 */
.fit{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin-top:48px;border-top:2px solid var(--ink)}
.fit article{padding:30px 28px 8px 0;margin-right:28px;border-right:1px solid var(--line)}
.fit article:last-child{border-right:0;margin-right:0}
.fit span{font-size:12px;letter-spacing:.24em;color:var(--seal)}
.fit h3{font-size:24px;margin-top:10px;letter-spacing:.06em;color:var(--head)}
.fit p{color:var(--ink-2);font-size:15px;margin-top:10px}

/* 创始人 */
.founder .grid{display:grid;grid-template-columns:minmax(0,.78fr) minmax(0,1.22fr);gap:64px;align-items:center}
.photo{position:relative;isolation:isolate}
.photo img{width:100%;box-shadow:0 30px 60px -34px rgba(40,25,5,.6)}
.photo::after{content:"";position:absolute;inset:16px -16px -16px 16px;border:1px solid var(--gold-2);z-index:-1}
.founder h3{font-size:40px;color:var(--head);letter-spacing:.22em;margin-top:14px}
.founder .role{color:var(--ink-2);font-size:14px;letter-spacing:.14em;margin-top:4px}
.founder ul{margin:26px 0 0;padding:0;list-style:none;display:grid;gap:12px}
.founder li{padding-left:28px;position:relative}
.founder li::before{content:"";position:absolute;left:0;top:.6em;width:12px;height:6px;border-left:1.5px solid var(--gold);border-bottom:1.5px solid var(--gold);transform:rotate(-45deg)}
.founder blockquote{margin:34px 0 0;padding:0 0 0 22px;border-left:2px solid var(--seal);font-family:var(--f-serif);font-size:22px;line-height:1.8}

/* 联系 */
.contact{text-align:center;overflow:hidden;background:radial-gradient(700px 420px at 50% 0%,rgba(214,96,64,.2),transparent 70%),var(--bg)}
.contact .kicker{justify-content:center}
.contact .kicker::after{content:"";width:28px;height:1px;background:var(--gold)}
.contact h2{font-size:clamp(30px,5vw,56px)}
.stamp{width:92px;height:92px;margin:0 auto 26px}
.wx{display:inline-flex;align-items:center;gap:16px;margin-top:32px;border:1px solid var(--gold-2);padding:12px 14px 12px 24px}
.wx span{color:var(--ink-2);font-size:14px;letter-spacing:.1em}
.wx b{font-size:22px;letter-spacing:.08em;font-family:ui-monospace,"SF Mono",Menlo,monospace}
.wx button{font:inherit;font-size:14px;background:var(--gold);color:var(--on-gold);border:0;padding:8px 16px;cursor:pointer;letter-spacing:.1em}
.addr{margin-top:22px;color:var(--ink-2);font-size:14px}

footer{padding:26px 0 40px;color:var(--ink-2);font-size:13px;border-top:1px solid var(--line);background:#20232C}
footer .wrap{display:flex;flex-wrap:wrap;gap:6px 18px;justify-content:space-between}
footer a{color:inherit}

/* 进场动效：只有脚本在跑时才把内容先藏起来 */
.js .rv{opacity:0;transform:translateY(34px);transition:opacity .9s var(--ease),transform .9s var(--ease);transition-delay:var(--d,0s)}
.js .rv.in{opacity:1;transform:none}
.js .hero h1 .ln i{transform:translateY(105%);animation:rise 1.1s var(--ease) forwards}
.js .hero h1 .ln:nth-child(1) i{animation-delay:.15s}
.js .hero h1 .ln:nth-child(2) i{animation:rise 1.1s var(--ease) .32s forwards,shine 6s linear 1.6s infinite}
.js .hero h1 .ln:nth-child(3) i{animation-delay:.49s}
.js .hero .fade{opacity:0;animation:fade 1s var(--ease) forwards;animation-delay:var(--d,.9s)}
.js .glyph text{stroke-dashoffset:2600;animation:ink 4.2s var(--ease) .3s forwards}
.js .scroll{animation:drip 2.2s var(--ease) infinite}
.js .steps::before{transform:scaleX(0);transition:transform 1.6s var(--ease) .2s}
.js .steps.in::before{transform:scaleX(1)}
.js .photo img{clip-path:inset(0 100% 0 0);transition:clip-path 1.3s var(--ease)}
.js .photo.in img{clip-path:inset(0)}
.js .photo::after{opacity:0;transform:translate(-16px,-16px);transition:opacity .8s .7s,transform .9s var(--ease) .7s}
.js .photo.in::after{opacity:1;transform:none}
.js .stamp{opacity:0;transform:scale(2.4) rotate(-18deg)}
.js .stamp.in{animation:stamp .7s cubic-bezier(.2,1.4,.4,1) .15s forwards}
@keyframes rise{to{transform:none}}
@keyframes fade{to{opacity:1}}
@keyframes shine{to{background-position:-220% 0}}
@keyframes ink{to{stroke-dashoffset:0}}
@keyframes drip{0%{transform:scaleY(0)}50%{transform:scaleY(1)}100%{transform:scaleY(1);opacity:0}}
@keyframes stamp{to{opacity:1;transform:scale(1) rotate(-6deg)}}

@media (max-width:880px){
  .nav{display:none}
  section{padding:70px 0}
  .hero{padding:110px 0 100px}
  .glyph{width:108vw;right:-34%;top:40%}
  .stats .wrap{grid-template-columns:repeat(2,minmax(0,1fr));margin-inline:16px;padding:0;transform:translateY(-40px)}
  .stat{padding:22px 18px}
  .stat:nth-child(3){border-left:0}
  .stat:nth-child(n+3){border-top:1px solid var(--line)}
  #believe{padding-top:30px}
  .three,.works,.apc .grid,.founder .grid,.fit{grid-template-columns:minmax(0,1fr)}
  .steps{grid-template-columns:minmax(0,1fr);gap:28px}
  .steps::before{left:22px;right:auto;top:22px;bottom:22px;width:1px;height:auto;transform-origin:50% 0}
  .js .steps::before{transform:scaleY(0)}
  .js .steps.in::before{transform:scaleY(1)}
  .steps li{display:grid;grid-template-columns:44px minmax(0,1fr);column-gap:18px}
  .steps h3{margin-top:4px}
  .steps p{grid-column:2}
  .fit article{border-right:0;margin-right:0;border-bottom:1px solid var(--line);padding:24px 0}
  .svc article{grid-template-columns:56px minmax(0,1fr);gap:12px 16px}
  .svc .no{font-size:34px}
  .svc ul{grid-column:2}
  .photo{max-width:270px}
  .founder .grid{gap:40px}
  .wx{flex-wrap:wrap;justify-content:center;padding:14px}
  .motto{font-size:17px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .js .rv,.js .hero .fade,.js .stamp{opacity:1;transform:none}
  .js .hero h1 .ln i{transform:none}
  .js .glyph text{stroke-dashoffset:0}
  .js .steps::before{transform:none}
  .js .photo img{clip-path:none}
  .js .photo::after{opacity:1;transform:none}
  #net{display:none}
}