/* 标题宋体兜底：系统没有宋体 SC（Windows 等）时才下载，Noto Serif SC Bold 子集，SIL OFL 1.1 */
@font-face{font-family:"UG Serif";src:url("/fonts/ug-serif-bold.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}

:root{
  --bg:#fff;--fg:#000;--mute:#6b6b6b;--line:#e6e6e6;--rule:#000;
  --acc:#4B36C9;--acc-soft:#EFECFB;
  --deep:#16122E;--deep-fg:#F3F1FA;--deep-mute:#CFCBE0;--deep-faint:#A9A4BE;--deep-acc:#8C7BFF;--deep-kick:#B9AEFF;
  --sans:"Helvetica Neue",Helvetica,"PingFang SC","Hiragino Sans GB","Noto Sans CJK SC","Source Han Sans SC","Microsoft YaHei",Arial,sans-serif;
  --serif:"Songti SC","UG Serif","Noto Serif CJK SC","Source Han Serif SC","Source Han Serif CN","STSong",serif;
  --latin:"Futura","Avenir Next","Helvetica Neue",Helvetica,Arial,sans-serif;
  --ease:cubic-bezier(.2,.65,.2,1);
  --pad:40px;--gap:32px;--top:88px;
  --s1:8px;--s2:16px;--s3:24px;--s4:40px;--s5:64px;--s6:96px;--s7:160px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg);color:var(--fg);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-feature-settings:"palt","kern"}
a{color:inherit;text-decoration:none}
b,strong{font-weight:600}
p{text-wrap:pretty}
::selection{background:var(--acc);color:#fff}
:focus-visible{outline:2px solid var(--acc);outline-offset:4px}
.wrap{padding:0 var(--pad);max-width:1360px;margin:0 auto}
.num{font-variant-numeric:tabular-nums}
.todo{color:var(--mute);white-space:nowrap}
.todo::before{content:"[ "}
.todo::after{content:" ]"}
svg.mark,svg.wmark{display:block;aspect-ratio:16/22;height:auto}
@supports not (aspect-ratio:16/22){
  .brand .mark{height:23px}.hero .mark{height:clamp(50px,4.4vw,63px)}footer .big .mark{height:.58em}.panel .wmark{height:auto;width:min(52vw,760px)}
}

/* 标题字：宋体，正字距 */
.serif,h1,h2,.panel .v{font-family:var(--serif);font-weight:700;letter-spacing:.01em;word-break:keep-all;line-break:strict}

/* 角：永远是紫的，角上的两道线用所在底色 */
.mark{color:var(--acc);--paper:var(--bg)}

/* ---------- 顶栏：吸顶、滚动后出细线 ---------- */
.top{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.88);-webkit-backdrop-filter:saturate(180%) blur(14px);backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid transparent;transition:border-color .3s var(--ease)}
.top.on{border-bottom-color:var(--line)}
.top .wrap{height:var(--top);display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:14px;white-space:nowrap}
.brand .mark{width:17px;flex:none}
.wm,.word,footer .big,.hero .en{font-family:var(--latin);font-weight:500;text-transform:uppercase}
.word{font-size:16px;letter-spacing:.1em;word-spacing:.1em}
.word i,footer .big i{font-style:normal;color:var(--acc)}
.nav{display:flex;gap:34px;font-size:15px;align-items:center}
.nav a{white-space:nowrap;position:relative}
.nav a:not(.cta){padding:4px 0}
.nav a:not(.cta)::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--acc);transform:scaleX(0);transform-origin:left;transition:transform .35s var(--ease)}
.nav a:not(.cta):hover{color:var(--acc)}
.nav a:not(.cta):hover::after{transform:scaleX(1)}
.cta{background:var(--fg);color:var(--bg);padding:10px 22px;border-radius:999px;font-weight:500;transition:background .25s var(--ease),color .25s var(--ease)}
.cta:hover{background:var(--acc)}

/* ---------- 首屏：角 → 宋体大字 → 紫色短线 → 英文一行 ---------- */
.hero{padding:120px 0 136px}
.hero .wrap{display:grid;grid-template-columns:repeat(12,1fr);column-gap:var(--gap);align-items:end}
.hero .mark{grid-column:1/-1;width:clamp(36px,3.2vw,46px);margin-bottom:52px}
h1{grid-column:1/-1;font-size:clamp(46px,8.6vw,140px);line-height:1.08;text-wrap:balance}
.hero .en{grid-column:1/-1;margin-top:40px;font-size:12px;letter-spacing:.28em;color:var(--mute)}
.hero .en::before{content:"";display:block;width:72px;height:3px;background:var(--acc);margin-bottom:28px}
.lead{grid-column:1/8;font-size:clamp(18px,1.45vw,21px);line-height:1.6;margin-top:72px;max-width:32em}
.acts{grid-column:9/-1;margin-top:72px;display:flex;gap:28px;align-items:center;justify-content:flex-end;flex-wrap:wrap;font-size:16px}
.acts a{position:relative;padding:4px 0;white-space:nowrap}
.acts a:first-child::after{content:"↓";margin-left:.5em;display:inline-block;transition:transform .35s var(--ease)}
.acts a:first-child:hover{color:var(--acc)}
.acts a:first-child:hover::after{transform:translateY(4px)}
.acts a:last-child{background:var(--fg);color:var(--bg);padding:14px 26px;border-radius:999px;font-weight:500;transition:background .25s var(--ease)}
.acts a:last-child:hover{background:var(--acc)}

@keyframes up{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}
.hero .mark,.hero h1,.hero .en,.hero .lead,.hero .acts{animation:up 1s var(--ease) both}
.hero h1{animation-delay:.08s}.hero .en{animation-delay:.22s}.hero .lead{animation-delay:.34s}.hero .acts{animation-delay:.44s}

/* ---------- 深色面板：深紫黑底，右侧一只淡紫的大角 ---------- */
.panel{position:relative;overflow:hidden;background:var(--deep);color:var(--deep-fg);padding:152px 0}
.panel .wmark{position:absolute;right:4vw;bottom:-10%;height:118%;width:auto;color:var(--deep-acc);opacity:.14;--paper:var(--deep);pointer-events:none}
.panel .wrap{position:relative;display:grid;grid-template-columns:repeat(12,1fr);column-gap:var(--gap)}
.panel .k{grid-column:1/-1;font-size:13px;letter-spacing:.2em;color:var(--deep-kick)}
.panel .v{grid-column:1/-1;font-size:clamp(42px,6vw,100px);line-height:1.18;margin-top:28px}
.panel .v>div{white-space:nowrap}
.panel .note{grid-column:1/8;margin-top:88px;font-size:17px;color:var(--deep-mute);max-width:38em}
.panel .note a{color:var(--deep-fg);border-bottom:1px solid var(--deep-acc)}

/* ---------- 分节：12 栏，紫色节号，宋体节题，双栏节头 ---------- */
main{counter-reset:sec}
section{padding:var(--s7) 0;border-top:1px solid var(--line);scroll-margin-top:var(--top)}
section.hero{border-top:0}
section[id]{counter-increment:sec}
section[id]>.wrap{display:grid;grid-template-columns:repeat(12,1fr);column-gap:var(--gap);align-items:end}
h2{grid-column:1/7;font-size:clamp(38px,5.2vw,80px);line-height:1.12;text-wrap:balance}
h2::before{content:counter(sec,decimal-leading-zero);display:block;font-family:var(--latin);font-size:13px;font-weight:500;letter-spacing:.2em;color:var(--acc);margin-bottom:34px;font-variant-numeric:tabular-nums}
.sub{grid-column:8/-1;font-size:clamp(18px,1.4vw,20px);line-height:1.6;max-width:30em;align-self:end}
section[id]>.wrap>*:not(h2):not(.sub){grid-column:1/-1}

/* 卡片：紫色编号角标、眉题上提、交付沉底 */
.cols{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--s5) var(--gap);margin-top:var(--s6);counter-reset:card}
.cols>div{min-width:0;display:flex;flex-direction:column;padding-top:var(--s3);border-top:1px solid var(--rule)}
.cols>div::before{order:-2;counter-increment:card;content:counter(card,decimal-leading-zero);font-family:var(--latin);font-weight:500;font-size:13px;letter-spacing:.2em;color:var(--acc);font-variant-numeric:tabular-nums;margin-bottom:var(--s4)}
.cols.four{grid-template-columns:repeat(4,1fr)}
.cols.two{grid-template-columns:1fr 1fr;gap:var(--s5) var(--s6)}
h3{font-weight:600;font-size:clamp(22px,1.75vw,26px);line-height:1.25;letter-spacing:-.015em}
.cols p{margin-top:var(--s2);font-size:17px}
.cols p+p{margin-top:var(--s1)}
.cols p.in{order:-1;margin:0 0 var(--s2);font-size:13px;letter-spacing:.04em;color:var(--mute);line-height:1.6}
.cols p.d{margin-top:auto;padding-top:var(--s4);font-size:14px;color:var(--mute);line-height:1.6}
.cols p.d:not(:last-child){margin-top:var(--s3)}

#what .cols>div::before{display:none}
#what .cols p.in{min-height:3.2em}

/* 六个环节：紫色大数字 */
.cols.steps{row-gap:var(--s6)}
.cols.steps>div::before{font-size:clamp(48px,4.6vw,72px);line-height:1;letter-spacing:-.01em;color:var(--acc);margin-bottom:var(--s3)}

/* 三理由：细线清单 */
.cols.rows{display:block;margin-top:var(--s6);border-top:1px solid var(--rule)}
.cols.rows>div{display:grid;grid-template-columns:5em 5fr 7fr;column-gap:var(--gap);align-items:baseline;padding:var(--s4) 0;border-top:0;border-bottom:1px solid var(--line)}
.cols.rows>div::before{margin:0;font-size:13px}
.cols.rows h3{font-size:clamp(24px,2.1vw,32px)}
.cols.rows p{margin:0;font-size:17px;max-width:34em}

/* 清单行 */
.who{list-style:none;margin-top:var(--s6);border-top:1px solid var(--rule)}
.who li{display:grid;grid-template-columns:12em 1fr;gap:var(--s3);padding:26px 0;border-bottom:1px solid var(--line);align-items:baseline}
.who li b{font-weight:600;font-size:21px;letter-spacing:-.01em}
.who li span{font-size:17px}
.after{margin-top:var(--s5);font-size:17px;max-width:44em}
.foot{margin-top:var(--s5);font-size:15px;color:var(--mute);max-width:44em}
.after+.foot{margin-top:var(--s4)}
section[id]>.wrap>.after,section[id]>.wrap>.foot{grid-column:1/10}

/* ---------- 问答：展开的那条变紫 ---------- */
.qa{margin-top:var(--s6);border-top:1px solid var(--rule)}
.qa details{border-bottom:1px solid var(--line)}
.qa summary{cursor:pointer;list-style:none;padding:28px 0;font-weight:600;font-size:clamp(20px,1.9vw,26px);letter-spacing:-.015em;line-height:1.3;display:grid;grid-template-columns:1fr 40px;gap:var(--s3);align-items:center;transition:color .25s var(--ease)}
.qa summary:hover,.qa details[open] summary{color:var(--acc)}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"";justify-self:end;width:14px;height:14px;background:
  linear-gradient(currentColor,currentColor) center/100% 1px no-repeat,
  linear-gradient(currentColor,currentColor) center/1px 100% no-repeat;transition:transform .4s var(--ease)}
.qa details[open] summary::after{transform:rotate(45deg)}
.qa .ans{padding:0 0 32px;font-size:17px;max-width:40em}
.qa details[open] .ans{animation:up .5s var(--ease) both}

/* ---------- 联系：微信号放大，附带信息放右栏 ---------- */
#contact .sub{grid-column:8/-1}
#contact .ways{grid-column:1/6;grid-row:2;margin-top:var(--s6);border-top:1px solid var(--rule);list-style:none;align-self:start}
#contact .who{grid-column:7/-1;grid-row:2;margin-top:var(--s6)}
.ways li{display:grid;gap:6px;padding:26px 0;border-bottom:1px solid var(--line)}
.ways li span:first-child{color:var(--mute);font-size:13px;letter-spacing:.08em}
.ways li span:last-child{font-weight:600;font-size:clamp(26px,2.6vw,40px);letter-spacing:-.02em;line-height:1.1;overflow-wrap:anywhere}
.ways li span.todo{font-weight:400;font-size:17px;letter-spacing:0}

/* ---------- 页脚：角 + 字标 ---------- */
footer{border-top:1px solid var(--rule);padding:72px 0 48px;font-size:14px;overflow:hidden}
footer .big{display:flex;align-items:center;gap:.28em;font-size:clamp(26px,6.6vw,100px);line-height:1;letter-spacing:.08em;white-space:nowrap;margin:0 0 48px}
footer .big .mark{width:.42em;flex:none}
footer .meta{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:20px;color:var(--mute)}
footer a:hover{color:var(--acc)}

/* ---------- 滚动显形：无 JS 时全部可见 ---------- */
.js .r{opacity:0;transform:translateY(22px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.js .r.in{opacity:1;transform:none}
.js .cols>div:nth-child(2){transition-delay:.1s}
.js .cols>div:nth-child(3){transition-delay:.2s}
.js .cols>div:nth-child(4){transition-delay:.05s}
.js .cols>div:nth-child(5){transition-delay:.15s}
.js .cols>div:nth-child(6){transition-delay:.25s}
.js .sub.r{transition-delay:.12s}
.js .panel .v.r{transition-delay:.08s}
.js .panel .note.r{transition-delay:.2s}
@media print{.js .r{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .r,.hero .mark,.hero h1,.hero .en,.hero .lead,.hero .acts,.qa details[open] .ans{animation:none;transition:none;opacity:1;transform:none}
}

/* ---------- 断点 ---------- */
@media (max-width:1000px){
  :root{--s7:120px;--s6:72px;--gap:24px}
  section[id]>.wrap,.hero .wrap,.panel .wrap{grid-template-columns:1fr}
  section[id]>.wrap>*,.hero .wrap>*,.panel .wrap>*{grid-column:1}
  .cols,.cols.four,.cols.two{grid-template-columns:1fr 1fr;gap:var(--s5) var(--gap)}
  .sub,#contact .sub{margin-top:var(--s4);max-width:36em;align-self:start}
  .lead{margin-top:56px}
  .acts{justify-content:flex-start;margin-top:40px}
  #contact .sub,#contact .ways,#contact .who{grid-column:1}
  #contact h2{grid-row:1}#contact .sub{grid-row:2}#contact .ways{grid-row:3}#contact .who{grid-row:4;margin-top:var(--s5)}
  .panel .wmark{right:-6vw;height:110%;bottom:-8%}
  .cols.rows>div{grid-template-columns:4em 1fr;row-gap:var(--s2)}
  .cols.rows>div p{grid-column:2}
  .who li{grid-template-columns:9em 1fr}
  .nav{gap:20px}
  .nav a:not(.cta){display:none}
}
@media (max-width:720px){
  :root{--pad:20px;--top:68px;--s7:88px;--s6:48px;--s5:40px}
  .hero{padding:64px 0 80px}
  .hero .mark{width:30px;margin-bottom:36px}
  h1{font-size:clamp(40px,10.8vw,68px)}
  .hero .en{margin-top:28px;letter-spacing:.2em}
  .hero .en::before{width:56px;margin-bottom:20px}
  .lead{margin-top:40px}
  .acts{margin-top:32px;gap:22px}
  .panel{padding:88px 0}
  .panel .v{font-size:clamp(32px,9.2vw,52px);margin-top:20px}
  .panel .v>div{white-space:normal;word-break:keep-all;overflow-wrap:normal}
  .panel .note{margin-top:56px}
  .panel .wmark{right:-18vw;height:96%;bottom:-6%;opacity:.12}
  h2{font-size:clamp(34px,9vw,56px)}
  h2::before{margin-bottom:22px}
  .cols,.cols.four,.cols.two{grid-template-columns:1fr;gap:var(--s5)}
  .cols>div::before{margin-bottom:var(--s3)}
  .cols.steps>div::before{font-size:44px}
  .cols.rows>div{grid-template-columns:1fr;row-gap:10px;padding:28px 0}
  .cols.rows>div p{grid-column:1}
  #what .cols p.in{min-height:0}
  .who li{grid-template-columns:1fr;gap:6px;padding:22px 0}
  .ways li{padding:22px 0}.ways li span:last-child{font-size:6.4vw}
  .brand .mark{width:15px}
  .word{font-size:14px}
  footer{padding:56px 0 40px}
  footer .big{margin-bottom:28px;letter-spacing:.06em}
  .qa summary{padding:22px 0}
}

/* 联系方式里的邮箱链接 */
.ways li a:hover{color:var(--acc)}