:root{
  --paper:#F4F5F1;
  --paper-2:#EBEDE7;
  --ink:#161D1E;
  --ink-2:#3A4442;
  --muted:#6B7572;
  --line:#D3D8D0;
  --line-2:#BFC6BC;
  --copper:#B5622C;
  --copper-2:#8F4A1E;
  --copper-tint:#F3E4D8;
  --steel:#3B6A86;
  --steel-tint:#DFE9EF;
  --moss:#5C7A4A;
  --moss-tint:#E3EBDC;
  --serif:"Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --mono:"IBM Plex Mono","SF Mono",Menlo,Consolas,monospace;
  --measure:36em;
  --w:1180px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.75;
  font-feature-settings:"palt";
}
a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible{outline:2px solid var(--copper);outline-offset:3px;border-radius:2px}
h1,h2,h3{margin:0;font-family:var(--serif);font-weight:600;line-height:1.25;text-wrap:balance}
p{margin:0}
.wrap{max-width:var(--w);margin:0 auto;padding:0 clamp(20px,4vw,48px)}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}

/* header */
.top{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-weight:700;font-size:19px;letter-spacing:.01em}
.brand svg{width:26px;height:26px}
.nav{display:flex;gap:28px;font-size:14px;color:var(--ink-2)}
.nav a:hover{color:var(--copper)}

/* hero */
.hero{padding:clamp(56px,9vw,112px) 0 clamp(36px,5vw,56px)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:clamp(32px,6vw,88px);align-items:end}
.hero h1{font-size:clamp(34px,4.6vw,58px);font-weight:700;letter-spacing:-.01em;margin:18px 0 22px}
.hero h1 em{font-style:normal;color:var(--copper)}
.lede{font-size:clamp(16px,1.35vw,19px);color:var(--ink-2);max-width:var(--measure)}
.stats{display:grid;grid-template-columns:repeat(3,auto);gap:0 40px;border-top:1px solid var(--line-2);padding-top:22px;justify-content:start}
.stat .n{font-family:var(--serif);font-size:44px;font-weight:600;line-height:1;font-variant-numeric:tabular-nums}
.stat .n sup{font-size:.4em;color:var(--copper);vertical-align:top;top:.3em;position:relative;font-family:var(--mono);font-weight:500}
.stat .l{font-size:13px;color:var(--muted);margin-top:8px}

/* gantt motif */
.gantt{border:1px solid var(--line-2);background:#FBFBF9;padding:18px 18px 16px;font-family:var(--mono);font-size:11px;color:var(--muted)}
.gantt-head{display:grid;grid-template-columns:112px 1fr;margin-bottom:8px}
.ticks{display:grid;grid-template-columns:repeat(7,1fr);border-bottom:1px solid var(--line)}
.ticks span{padding-bottom:6px;border-left:1px dashed var(--line);min-width:0;overflow:hidden;white-space:nowrap;padding-left:4px}
.ticks span:first-child{border-left:0}
.row{display:grid;grid-template-columns:112px 1fr;align-items:center;height:26px}
.row .k{color:var(--ink-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding-right:10px}
.track{position:relative;height:14px;background-image:repeating-linear-gradient(90deg,transparent 0 calc(100%/7 - 1px),var(--line) 0 calc(100%/7))}
.bar{position:absolute;top:0;height:14px;background:var(--steel);opacity:.85}
.bar.c{background:var(--copper);opacity:1}
.bar.m{background:var(--moss);opacity:.9}
.bar.ghost{background:transparent;border:1.5px dashed var(--copper);height:11px;top:0}
.gantt-foot{display:flex;justify-content:space-between;margin-top:12px;padding-top:10px;border-top:1px solid var(--line);gap:12px;flex-wrap:wrap}
.gantt-foot i{display:inline-block;width:9px;height:9px;vertical-align:-1px;margin-right:6px}
.gantt-foot b{color:var(--copper);font-weight:500}

/* sections */
section{padding:clamp(40px,6vw,80px) 0}
.sec-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);gap:24px 64px;align-items:end;margin-bottom:clamp(28px,4vw,48px);padding-bottom:20px;border-bottom:2px solid var(--ink)}
.sec-head h2{font-size:clamp(26px,3vw,38px)}
.sec-head p{color:var(--ink-2);max-width:var(--measure)}

/* case groups */
.group{display:grid;grid-template-columns:200px minmax(0,1fr);gap:24px 56px;padding:36px 0;border-top:1px solid var(--line)}
.group:first-of-type{border-top:0;padding-top:0}
.group-h{position:sticky;top:76px;align-self:start}
.group-h h3{font-size:20px;font-weight:600;margin-top:6px}
.group-h .eyebrow{color:var(--copper)}
.group-h p{font-size:14px;color:var(--muted);margin-top:10px;line-height:1.65}
.cases{display:grid;gap:0}
.case{display:grid;grid-template-columns:minmax(0,1fr) 168px;gap:8px 32px;padding:26px 0;border-top:1px solid var(--line)}
.case:first-child{border-top:0;padding-top:0}
.case-meta{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;font-size:12.5px;color:var(--muted)}
.case-meta .ind{color:var(--ink-2)}
.case h4{margin:6px 0 8px;font-family:var(--serif);font-weight:600;font-size:22px;line-height:1.3}
.case h4 a:hover{color:var(--copper)}
.case h4 a[href]::after{content:"↗";font-family:var(--mono);font-size:14px;color:var(--copper);margin-left:8px;vertical-align:.2em}
.case p{color:var(--ink-2);font-size:15px;max-width:40em}
.caps{display:flex;flex-wrap:wrap;gap:6px 8px;margin-top:14px;padding:0;list-style:none}
.caps li{font-family:var(--mono);font-size:11.5px;color:var(--ink-2);border:1px solid var(--line-2);padding:3px 9px;border-radius:2px;background:#FBFBF9}
.side{display:flex;flex-direction:column;gap:10px;align-items:flex-start;padding-top:4px}
.badge{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:11px;letter-spacing:.04em;padding:4px 9px;border-radius:2px}
.badge::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor}
.badge.live{background:var(--moss-tint);color:var(--moss)}
.badge.auth{background:var(--steel-tint);color:var(--steel)}
.badge.priv{background:var(--paper-2);color:var(--muted)}
.badge.priv::before{background:transparent;border:1.5px solid currentColor;width:5px;height:5px}
.domain{font-family:var(--mono);font-size:12px;color:var(--muted);word-break:break-all;line-height:1.5}
.domain a:hover{color:var(--copper);text-decoration:underline;text-underline-offset:3px}

/* method */
.method{background:#FBFBF9;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.method-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0;border:1px solid var(--line-2);background:var(--line-2);gap:1px}
.m{background:#FBFBF9;padding:24px 22px 26px;display:flex;flex-direction:column;gap:10px}
.m .eyebrow{color:var(--copper)}
.m h3{font-size:18px;font-weight:600}
.m p{font-size:14px;color:var(--ink-2);line-height:1.7}

/* about / footer */
.about-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:40px 64px}
.about p{color:var(--ink-2);max-width:var(--measure)}
.about p+p{margin-top:14px}
.note{border-left:3px solid var(--copper);padding:6px 0 6px 18px;font-size:14px;color:var(--ink-2);background:transparent}
.note b{color:var(--ink);font-weight:500}
footer{border-top:1px solid var(--line);padding:28px 0 44px;font-size:13px;color:var(--muted)}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

@media (max-width:900px){
  .hero-grid,.sec-head,.about-grid{grid-template-columns:1fr}
  .group{grid-template-columns:1fr;gap:16px}
  .group-h{position:static}
  .method-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .method-grid .m:last-child{grid-column:1/-1}
}
@media (max-width:640px){
  .nav{display:none}
  .case{grid-template-columns:1fr}
  .side{flex-direction:row;flex-wrap:wrap;align-items:center;gap:8px 16px}
  .stats{grid-template-columns:repeat(3,auto);gap:0 22px}
  .stat .n{font-size:34px}
  .method-grid{grid-template-columns:1fr}
  .row,.gantt-head{grid-template-columns:88px 1fr}
  .gantt{padding:14px 12px 12px}
  .ticks span{font-size:10px;padding-left:3px}
}
@media (prefers-reduced-motion:no-preference){
  .case h4 a,.nav a,.domain a{transition:color .15s ease}
}

/* thesis: 障碍与本体解法 */
.thesis{border-top:1px solid var(--line)}
.thesis .sec-head p b{color:var(--copper);font-weight:600}
.arg{display:grid;grid-template-columns:200px minmax(0,1fr);gap:24px 56px;padding:44px 0;border-top:1px solid var(--line)}
.arg:first-of-type{border-top:0}
.arg-h{position:sticky;top:76px;align-self:start}
.arg-h .eyebrow{color:var(--copper)}
.arg-h h3{font-size:21px;font-weight:600;margin-top:6px}
.arg-h p{font-size:14px;color:var(--muted);margin-top:10px;line-height:1.65}
.arg-b{display:grid;gap:28px;min-width:0}
.arg-b p{font-size:15px;color:var(--ink-2)}
.two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line-2);border:1px solid var(--line-2)}
.four{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:var(--line-2);border:1px solid var(--line-2)}
.box{padding:20px 22px;border:1px solid var(--line-2);background:#FBFBF9;display:flex;flex-direction:column;gap:8px}
.box.copper{border-color:var(--copper);background:#FBF6F1}
.box-k{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--muted)}
.box.copper .box-k{color:var(--copper)}
.box-t{font-family:var(--serif);font-size:22px;font-weight:600;color:var(--ink)}
.box p{font-size:14px}
.box .ex{margin-top:6px;padding-top:10px;border-top:1px dashed var(--line-2);font-size:13.5px}
.box .ex span{font-weight:500;color:var(--ink)}
.dikw{border:1px solid var(--line-2);background:#FBFBF9;padding:22px 22px 16px}
.dikw-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:6px;align-items:end;height:150px}
.ds{height:calc(var(--h) * 28px + 10px);display:flex;flex-direction:column;justify-content:flex-start;padding:10px 10px 0;border-top:3px solid;font-size:12px;line-height:1.4}
.ds b{font-family:var(--serif);font-size:15px;font-weight:600;color:var(--ink)}
.ds span{color:var(--muted)}
.ds.ai{background:var(--steel-tint);border-color:var(--steel)}
.ds.moat{background:var(--copper-tint);border-color:var(--copper)}
.dikw-legend{display:flex;gap:24px;flex-wrap:wrap;margin-top:14px;font-size:12.5px;color:var(--ink-2);font-family:var(--mono)}
.dikw-legend i{display:inline-block;width:10px;height:10px;margin-right:7px;vertical-align:-1px}
.dikw-legend i.steel{background:var(--steel)}.dikw-legend i.copper{background:var(--copper)}
.gap-row{grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);align-items:start}
.gapchart{width:100%;height:auto;display:block;border:1px solid var(--line-2);background:#FBFBF9;padding:8px}
.pts{display:grid;gap:14px}
.pt{padding:14px 0 14px 16px;border-left:2px solid var(--line-2)}
.pt:last-child{border-left-color:var(--copper)}
.pt b{display:block;font-family:var(--serif);font-size:16px;font-weight:600;margin-bottom:4px}
.pt p{font-size:14px}
.cell,.tri{background:#FBFBF9;padding:18px 18px 20px;display:flex;flex-direction:column;gap:8px;min-width:0}
.cell-k,.tri-k{font-family:var(--serif);font-size:17px;font-weight:600}
.cell p,.tri p{font-size:14px}
.tri .std{font-family:var(--mono);font-size:11.5px;color:var(--steel);margin-top:auto;padding-top:8px;border-top:1px dashed var(--line-2)}
.tri .kind{font-family:var(--mono);font-size:11px;color:var(--copper);letter-spacing:.06em}
.shift{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:18px;align-items:center}
.shift-col{padding:18px 20px;border:1px solid var(--line-2);background:#FBFBF9}
.shift-col.now{border-color:var(--copper);background:#FBF6F1}
.shift-col.now .eyebrow{color:var(--copper)}
.shift ul{margin:10px 0 0;padding:0;list-style:none;display:grid;gap:6px;font-size:14px;color:var(--ink-2)}
.shift ul li::before{content:"—";color:var(--line-2);margin-right:8px}
.shift-arrow{font-family:var(--mono);font-size:22px;color:var(--copper)}
.pull{font-family:var(--serif);font-size:17px !important;line-height:1.7;color:var(--ink) !important;padding:4px 0 4px 20px;border-left:3px solid var(--copper);text-wrap:pretty}
.sub-k{font-family:var(--mono);font-size:12px;letter-spacing:.1em;color:var(--copper);margin-bottom:-14px;padding-top:6px}
.sub-p{font-size:14.5px !important}
.pipe{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;margin:0;padding:0;list-style:none;counter-reset:pipe}
.pipe li{counter-increment:pipe;position:relative;padding:14px 14px 16px;border:1px solid var(--line-2);background:#FBFBF9;display:flex;flex-direction:column;gap:4px;min-width:0}
.pipe li::before{content:"0" counter(pipe);font-family:var(--mono);font-size:11px;color:var(--copper);letter-spacing:.08em}
.pipe li b{font-family:var(--serif);font-size:16px;font-weight:600}
.pipe li span{font-size:13px;color:var(--ink-2);line-height:1.55}
.pipe li:not(:last-child)::after{content:"→";position:absolute;right:-11px;top:50%;transform:translateY(-50%);font-family:var(--mono);color:var(--copper);font-size:13px;background:var(--paper);z-index:1}
.fde{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1.3fr);gap:20px;align-items:center;padding:20px 22px;border:1px solid var(--line-2);background:#FBFBF9}
.q{margin:8px 0 0;padding:0;list-style:none;display:grid;gap:6px;font-size:14px;color:var(--ink-2)}
.q li{padding:7px 10px;border:1px solid var(--line-2);background:var(--paper);border-radius:2px}
.fde-agent{display:flex;flex-direction:column;align-items:center;text-align:center;gap:4px;padding:16px 18px;border:1.5px solid var(--copper);background:#FBF6F1;min-width:150px}
.fde-agent b{font-family:var(--serif);font-size:19px}
.fde-agent span{font-family:var(--mono);font-size:11px;color:var(--muted)}
.evo{margin:0;padding:0;list-style:none;display:grid;border-top:1px solid var(--line-2)}
.evo li{display:grid;grid-template-columns:96px minmax(0,1fr) minmax(0,1fr) minmax(0,1.4fr);gap:8px 20px;padding:12px 0;border-bottom:1px solid var(--line);font-size:13.5px;align-items:baseline}
.evo .yr{font-family:var(--mono);font-size:12px;color:var(--muted)}
.evo b{font-weight:500;color:var(--ink)}
.evo .who{color:var(--steel);font-family:var(--mono);font-size:12px}
.evo .do{color:var(--ink-2)}
.evo li.now{background:#FBF6F1;margin:0 -12px;padding-left:12px;padding-right:12px;border-left:3px solid var(--copper)}
.evo li.now .yr{color:var(--copper);font-weight:500}
.steps{margin:0;padding:0;list-style:none;display:grid;gap:0;counter-reset:st}
.steps li{counter-increment:st;display:grid;grid-template-columns:40px minmax(0,1fr);gap:0 14px;padding:14px 0;border-top:1px solid var(--line);align-items:baseline}
.steps li:first-child{border-top:0;padding-top:0}
.steps li::before{content:counter(st);font-family:var(--serif);font-size:26px;font-weight:600;color:var(--copper);line-height:1}
.steps li b{display:block;font-family:var(--serif);font-size:17px;font-weight:600}
.steps li span{display:block;grid-column:2;font-size:14px;color:var(--ink-2);margin-top:2px}
.sov .tri-k{font-size:16px}
.closing{border-top:2px solid var(--ink);padding-top:22px;display:grid;gap:14px}
.chain{display:flex;align-items:center;gap:14px;flex-wrap:wrap;font-family:var(--serif);font-size:clamp(20px,2.2vw,26px);font-weight:600}
.chain i{font-style:normal;color:var(--copper);font-family:var(--mono);font-size:.8em}
.chain span:last-child{color:var(--copper)}
.closing p{font-size:15px}
@media (max-width:900px){
  .arg{grid-template-columns:1fr;gap:16px}
  .arg-h{position:static}
  .gap-row,.two{grid-template-columns:1fr}
  .four{grid-template-columns:repeat(2,minmax(0,1fr))}
  .pipe{grid-template-columns:1fr;gap:6px}
  .pipe li:not(:last-child)::after{content:"↓";right:auto;left:14px;top:auto;bottom:-13px;transform:none}
  .shift{grid-template-columns:1fr}
  .shift-arrow{transform:rotate(90deg);justify-self:center}
  .fde{grid-template-columns:1fr}
  .fde-mid{justify-self:start}
  .evo li{grid-template-columns:80px minmax(0,1fr)}
  .evo li .who,.evo li .do{grid-column:2}
}
@media (max-width:640px){
  .three{grid-template-columns:1fr}
  .dikw-steps{height:130px}
  .ds{height:calc(var(--h) * 22px + 10px);padding:6px 6px 0}
  .ds b{font-size:13px}.ds span{display:none}
}

/* language switch */
.top-right{display:flex;align-items:center;gap:22px}
.lang{font-family:var(--mono);font-size:12px;letter-spacing:.08em;border:1px solid var(--line-2);padding:3px 9px;border-radius:2px;color:var(--ink-2);background:#FBFBF9}
.lang:hover{border-color:var(--copper);color:var(--copper)}

/* contact */
.about-side{display:grid;gap:22px;align-content:start}
.contact{border:1px solid var(--line-2);background:#FBFBF9;padding:20px 22px;display:grid;gap:12px}
.contact .eyebrow{color:var(--copper)}
.contact-rows{display:grid;gap:8px}
.contact-row{display:grid;grid-template-columns:72px minmax(0,1fr);gap:12px;align-items:baseline;font-size:14px}
.contact-row .k{color:var(--muted)}
.contact-row .v{font-family:var(--mono);font-size:14px;color:var(--ink);overflow-wrap:anywhere}
.contact-row .v a:hover{color:var(--copper);text-decoration:underline;text-underline-offset:3px}
.contact p{font-size:13.5px;color:var(--muted)}

/* share thumb (hidden, for WeChat card) */
.share-thumb{position:absolute;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none}
/* qr in contact */
.contact{grid-template-columns:minmax(0,1fr) auto;grid-template-areas:"k k" "rows qr" "p qr"}
.contact .eyebrow{grid-area:k}
.contact-rows{grid-area:rows}
.contact>p{grid-area:p}
.qr{grid-area:qr;display:flex;flex-direction:column;align-items:center;gap:6px;align-self:start}
.qr-box{width:92px;height:92px;padding:6px;background:#fff;border:1px solid var(--line-2)}
.qr-svg{width:100%;height:100%;display:block}
.qr span{font-family:var(--mono);font-size:10.5px;color:var(--muted);letter-spacing:.04em;text-align:center;max-width:110px}

@media (max-width:640px){
  .contact{grid-template-columns:1fr;grid-template-areas:"k" "rows" "qr" "p"}
  .qr{flex-direction:row;align-items:center;gap:14px;justify-self:start}
  .qr span{text-align:left;max-width:none}
}