@font-face{font-family:'Disp';font-weight:700;font-style:normal;font-display:swap;src:url(fonts/disp.woff2?v=1c7d1e83) format('woff2')}
@font-face{font-family:'DMM';font-weight:300;font-style:normal;font-display:swap;src:url(fonts/dmm-300.woff2?v=0608fc0b) format('woff2')}
@font-face{font-family:'DMM';font-weight:400;font-style:normal;font-display:swap;src:url(fonts/dmm-400.woff2?v=79bb5474) format('woff2')}
@font-face{font-family:'DMM';font-weight:500;font-style:normal;font-display:swap;src:url(fonts/dmm-500.woff2?v=beed6d17) format('woff2')}

/* 案例页是细节和证据，照片保留原色。 */
@view-transition{navigation:auto}
@media (prefers-reduced-motion:reduce){::view-transition-group(*),::view-transition-old(*),::view-transition-new(*){animation:none!important}}
::view-transition-old(case-soma),::view-transition-new(case-soma),::view-transition-old(case-mr),::view-transition-new(case-mr){height:100%;object-fit:cover}
:root{
  --bg:#E6E4EA; --bg-2:#DCDAE2; --ink:#1D1C22; --dim:#55535E; --faint:#8C8A96; --rule:#C5C2CD;
  --orb:#22B49B; --orb-ink:#0B6B5D; --off:#A6405C;
  --w-bg:#0E2532; --w-ink:#E8F1EE; --w-line:#2D4C5C;
  --f-disp:"Disp","Songti SC","STSong","Noto Serif SC","Source Han Serif SC",serif;
  --f-body:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --f-mono:"DMM",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --gut:clamp(16px,4.5vw,64px); --maxw:1100px; --r:16px; --pad:clamp(56px,10vh,112px);
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#26252B;--bg-2:#302F36;--ink:#ECEAF0;--dim:#AAA7B3;--faint:#75727F;--rule:#45434D;--orb:#3ED0B5;--orb-ink:#6FDCC8;--off:#E68AA5;color-scheme:dark}}
:root[data-theme="dark"]{--bg:#26252B;--bg-2:#302F36;--ink:#ECEAF0;--dim:#AAA7B3;--faint:#75727F;--rule:#45434D;--orb:#3ED0B5;--orb-ink:#6FDCC8;--off:#E68AA5;color-scheme:dark}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:72px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:1.0625rem;line-height:1.8;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,video,svg{display:block;max-width:100%}
a{color:inherit;text-decoration-thickness:1px;text-underline-offset:4px;text-decoration-color:var(--faint)}
a:hover{color:var(--orb-ink)}
:focus-visible{outline:2px solid var(--orb);outline-offset:3px}
h1,h2,h3,h4{font-weight:700;margin:0;text-wrap:balance}
p,li,dd,figcaption{margin:0;text-wrap:pretty}
figure{margin:0}
button{font:inherit;color:inherit}
.num{font-variant-numeric:tabular-nums}
.dim{color:var(--dim)}

/* top bar: back, chapters, reading progress */
.top{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--rule);padding-top:env(safe-area-inset-top,0px)}
.bar{max-width:var(--maxw);margin:0 auto;padding:8px var(--gut);display:flex;align-items:center;gap:12px}
.back{font-size:.875rem;text-decoration:none;color:var(--dim);white-space:nowrap;padding:8px 0}
.chap{display:flex;gap:2px;margin-left:auto}
.chap a{font-size:.8125rem;line-height:1;padding:9px 11px;border-radius:999px;text-decoration:none;color:var(--dim);white-space:nowrap}
.chap a b{font:400 .75rem/1 var(--f-mono);margin-right:6px;color:var(--faint)}
.chap a[aria-current="true"]{background:var(--ink);color:var(--bg)}
.chap a[aria-current="true"] b{color:inherit;opacity:.6}
.rt{font:400 .75rem/1 var(--f-mono);color:var(--faint);white-space:nowrap}
.prog{position:absolute;left:0;right:0;bottom:-1px;height:2px}
.prog i{display:block;height:100%;width:100%;background:var(--orb);transform-origin:0 50%;transform:scaleX(0)}

.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gut)}
.scene > .wrap{padding-block:var(--pad)}
.scene + .scene > .wrap{padding-top:0}
.scene + .scene > .wrap::before{content:"";display:block;border-top:1px solid var(--rule);margin-bottom:var(--pad)}
.where{display:flex;align-items:baseline;gap:18px;flex-wrap:wrap;margin-bottom:20px}
.where b{font:300 clamp(2.2rem,4.6vw,3.4rem)/1 var(--f-mono);letter-spacing:-.05em;white-space:nowrap}
.where span{font-size:.9375rem;color:var(--dim)}
.meta{font-size:.875rem;color:var(--dim);margin-bottom:22px}
.kick{font:400 .8125rem/1 var(--f-mono);letter-spacing:.06em;color:var(--dim);margin:0 0 14px;display:flex;gap:10px;align-items:center}
.kick::before{content:"";width:22px;height:1px;background:var(--ink)}
h2{font-family:var(--f-disp);font-size:clamp(2rem,4vw,3.2rem);line-height:1.22;max-width:16em}
h3{font-family:var(--f-disp);font-size:clamp(1.35rem,2.2vw,1.8rem);line-height:1.35;margin-bottom:20px}
h4{font-size:1rem;font-weight:600;margin-bottom:10px}
.lede{display:grid;gap:14px;max-width:36em;margin-top:26px}
.lede p:first-child{font-size:1.125rem}
.block{margin-top:clamp(56px,9vh,96px)}
.cap{font-size:.875rem;color:var(--dim);margin-top:12px;max-width:44em;line-height:1.7}
.two{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:clamp(24px,4vw,64px);align-items:start}
.two > *{min-width:0}
.photo img{width:100%;height:auto;border-radius:var(--r)}
.win{border-radius:var(--r);overflow:hidden;background:var(--w-bg);color:var(--w-ink);position:relative}
.win img,.win video{width:100%;height:auto}

/* hero */
.hero h1{font-family:var(--f-disp);font-size:clamp(3rem,8vw,5.6rem);line-height:1;letter-spacing:-.01em}
.hero .tag{font-family:var(--f-disp);font-weight:700;font-size:clamp(1.3rem,2.6vw,1.9rem);line-height:1.4;margin-top:16px}
.hero .intro{margin-top:22px;max-width:30em;color:var(--dim)}
.hero .photo{max-width:440px;justify-self:end;width:100%}
.tldr{margin:clamp(40px,6vh,64px) 0 0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--ink)}
.tldr div{padding:14px 18px 4px;border-left:1px solid var(--rule)}
.tldr div:first-child{border-left:0;padding-left:0}
.tldr dt{font:500 .75rem/1 var(--f-mono);letter-spacing:.06em;color:var(--dim);margin-bottom:10px}
.tldr dd{margin:0;font-size:.9375rem;line-height:1.7}
.tldr div:last-child dd{font-weight:600}

/* two paths */
.paths{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.path{border:1px solid var(--rule);border-radius:var(--r);padding:20px 22px 18px;display:grid;gap:10px;align-content:start}
.path.on{border-color:var(--ink)}
.pl{font:500 .8125rem/1 var(--f-mono);letter-spacing:.04em;color:var(--dim)}
.path.on .pl{color:var(--orb-ink)}
.path p{font-size:.9375rem}
.path .cost{font-size:.875rem;color:var(--dim);border-top:1px solid var(--rule);padding-top:10px;margin-top:4px}
.q{margin-top:32px;font-family:var(--f-disp);font-weight:700;font-size:clamp(1.15rem,1.9vw,1.45rem);line-height:1.65;max-width:28em;border-left:2px solid var(--orb);padding-left:18px}

/* hypotheses */
.hyp{list-style:none;margin:0;padding:0;border-top:1px solid var(--ink)}
.hyp li{display:grid;grid-template-columns:3.4rem minmax(0,1.1fr) minmax(0,1fr);gap:4px 18px;padding:14px 0;border-bottom:1px solid var(--rule);align-items:baseline}
.hyp b{font:500 .875rem/1 var(--f-mono)}
.hyp em{font-style:normal;font-size:.875rem;color:var(--dim)}

/* architecture */
.arch{display:grid;grid-template-columns:minmax(0,1fr) 72px minmax(0,1fr) 72px minmax(0,1fr);align-items:stretch}
.node{border:1px solid var(--rule);border-radius:var(--r);padding:16px 18px;display:grid;gap:6px;align-content:start}
.node.hl{border-color:var(--ink)}
.node .n{font:400 .75rem/1 var(--f-mono);color:var(--faint)}
.node b{font-size:1.0625rem}
.node p{font-size:.875rem;color:var(--dim);line-height:1.6}
.link{position:relative;display:grid;place-items:center}
.link::before{content:"";position:absolute;left:8px;right:8px;top:50%;border-top:1px dashed var(--faint)}
.link span{position:relative;background:var(--bg);padding:0 6px;font:400 .75rem/1 var(--f-mono);color:var(--dim)}

/* mapping table */
.map{width:100%;border-collapse:collapse;font-size:.9375rem}
.map th{font:500 .75rem/1 var(--f-mono);letter-spacing:.06em;color:var(--dim);text-align:left;padding:0 14px 10px 0;border-bottom:1px solid var(--ink);font-weight:500}
.map td{padding:12px 14px 12px 0;border-bottom:1px solid var(--rule);vertical-align:top;line-height:1.6}
.map td:first-child{font-weight:600;white-space:nowrap}
.map td.m{font-family:var(--f-mono);font-size:.875rem;white-space:nowrap}
.map tr.hl td{background:color-mix(in srgb,var(--orb) 10%,transparent)}
.map tr.hl td:first-child{box-shadow:inset 3px 0 0 var(--orb);padding-left:10px}

/* folded detail */
.more{margin-top:20px;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.more + .more{margin-top:0;border-top:0}
.more summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:14px 0;font-size:.9375rem}
.more summary::-webkit-details-marker{display:none}
.more summary::after{content:"展开";font:400 .75rem/1 var(--f-mono);color:var(--dim);border:1px solid var(--rule);border-radius:999px;padding:6px 10px}
.more[open] summary::after{content:"收起"}
.more .inner{padding:4px 0 22px}
.amps{display:grid;border-top:1px solid var(--ink);max-width:620px}
.amps div{display:grid;grid-template-columns:2.4rem minmax(0,1fr) 5rem;gap:16px;padding:11px 0;border-bottom:1px solid var(--rule);align-items:baseline;font-size:.9375rem}
.amps .l{font:500 .75rem/1 var(--f-mono);color:var(--dim)}
.amps .a{font:400 .9375rem/1 var(--f-mono);text-align:right;white-space:nowrap}
.spec{margin:0;display:grid;grid-template-columns:6.5rem minmax(0,1fr);max-width:720px;border-top:1px solid var(--ink)}
.spec dt,.spec dd{margin:0;padding:10px 0;border-bottom:1px solid var(--rule);font-size:.9375rem}
.spec dt{color:var(--dim)}

/* iteration strip */
.stages{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.stages figure{display:grid;gap:10px;align-content:start}
.stages img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;border-radius:10px}
.stages figcaption{font-size:.875rem;line-height:1.6;color:var(--dim)}
.stages .st{font:500 .75rem/1 var(--f-mono);letter-spacing:.04em;color:var(--ink);display:block;margin-bottom:6px}

/* protocol */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,.8fr) minmax(0,2.6fr) minmax(0,.8fr) minmax(0,.8fr);gap:8px}
.steps li{border:1px solid var(--rule);border-radius:12px;padding:14px 16px;display:grid;gap:4px;align-content:start}
.steps b{font-size:.9375rem}
.steps span{font-size:.8125rem;color:var(--dim);line-height:1.6}
.steps li.vr{background:var(--w-bg);color:var(--w-ink);border-color:var(--w-bg)}
.steps li.vr span{color:#B7C9C4}
.rec{margin-top:8px;border:1px dashed var(--faint);border-radius:999px;padding:7px 16px;font:400 .75rem/1.4 var(--f-mono);color:var(--dim);text-align:center}
.order{display:grid;gap:8px;margin-top:24px;max-width:520px}
.order div{display:grid;grid-template-columns:3.2rem minmax(0,1fr) 4.6rem minmax(0,1fr);gap:10px;align-items:center;font-size:.875rem}
.order .c{border:1px solid var(--rule);border-radius:999px;text-align:center;padding:5px 0}
.order .c.on{background:var(--orb);border-color:var(--orb);color:#08261F}
.order .g{font:400 .75rem/1 var(--f-mono);color:var(--faint);text-align:center}

.pair2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;max-width:620px}
.pair2 img{aspect-ratio:3/4;object-fit:cover}

/* video */
.vid{margin-top:48px}
.vid video{aspect-ratio:16/9;background:var(--w-bg)}
.vsound{position:absolute;right:14px;bottom:14px;min-height:42px;padding:0 16px;border-radius:999px;border:0;background:rgba(14,37,50,.86);color:#fff;font-size:.8125rem;cursor:pointer;display:flex;gap:10px;align-items:center}
.vsound:hover{background:#0B6B5D}
.vsound i{font-style:normal;font-family:var(--f-mono);opacity:.7}
.vsound[hidden]{display:none}

/* verdicts */
.verdict{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));border-top:1px solid var(--ink)}
.v{padding:22px 28px 26px 0;border-bottom:1px solid var(--rule);display:grid;gap:12px;align-content:start}
.v:nth-child(2n){padding:22px 0 26px 28px;border-left:1px solid var(--rule)}
.v .h{font:500 .8125rem/1.3 var(--f-mono);letter-spacing:.03em;color:var(--dim);display:flex;justify-content:space-between;gap:12px}
.v .h em{font-style:normal;color:var(--orb-ink);white-space:nowrap}
.v .k{font:300 clamp(2.4rem,5vw,3.4rem)/1 var(--f-mono);letter-spacing:-.04em}
.v .k small{display:block;font:400 .875rem/1.4 var(--f-body);letter-spacing:0;color:var(--dim);margin-top:10px}
.v p{font-size:.9375rem}
.stat{font:400 .75rem/1.7 var(--f-mono);color:var(--dim)}
.stat span{white-space:nowrap}
.chart{margin-top:48px;max-width:760px}
#fms text{font:400 12px var(--f-mono);fill:var(--dim)}

/* tables at the end of a chapter */
.check{margin-top:clamp(48px,7vh,72px);border-top:1px solid var(--ink)}
.check > p{font:500 .75rem/1 var(--f-mono);letter-spacing:.08em;padding:14px 0 6px;color:var(--dim)}
.check dl{margin:0;display:grid;grid-template-columns:8rem minmax(0,1fr)}
.check dt,.check dd{margin:0;padding:12px 0;border-bottom:1px solid var(--rule);font-size:.9375rem}
.check dt{color:var(--dim)}
.check ol{margin:0;padding:0;list-style:none;counter-reset:li}
.check ol li{counter-increment:li;display:grid;grid-template-columns:8rem minmax(0,1fr);padding:12px 0;border-bottom:1px solid var(--rule);font-size:.9375rem}
.check ol li::before{content:counter(li);font:400 .875rem/1.8 var(--f-mono);color:var(--dim)}

.duo{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(24px,4vw,56px)}
.duo > *{min-width:0}
.duo .check ol li{grid-template-columns:2rem minmax(0,1fr)}
.duo .check dl{grid-template-columns:5rem minmax(0,1fr)}
.coda{font-family:var(--f-disp);font-weight:700;font-size:clamp(1.35rem,2.6vw,1.9rem);line-height:1.6;max-width:20em;margin-top:clamp(64px,10vh,104px)}
.src{font-size:.8125rem;color:var(--dim);margin-top:28px;max-width:52em}
.next{max-width:var(--maxw);margin:0 auto;padding:0 var(--gut) 56px}
.next > div{display:flex;justify-content:space-between;align-items:end;gap:16px;border-top:1px solid var(--ink);padding-top:22px}
.next a{text-decoration:none}
.next .bk{font-size:.9375rem;color:var(--dim)}
.next .nx{text-align:right;font-family:var(--f-disp);font-weight:700;font-size:clamp(1.3rem,2.4vw,1.8rem);line-height:1.3}
.next .nx small{display:block;font:400 .75rem/1 var(--f-mono);color:var(--dim);margin-bottom:10px;font-weight:400}

@media (max-width:860px){
  .stages{grid-template-columns:repeat(2,minmax(0,1fr))}
  .tldr{grid-template-columns:repeat(2,minmax(0,1fr))}
  .tldr div:nth-child(3){border-left:0;padding-left:0}
  .tldr div{padding-bottom:14px}
  .tldr div:nth-child(-n+2){border-bottom:1px solid var(--rule)}
  .steps{grid-template-columns:repeat(2,minmax(0,1fr))}
  .steps li.vr{grid-column:1 / -1}
}
@media (max-width:760px){
  .two,.paths,.verdict,.duo{grid-template-columns:minmax(0,1fr)}
  .duo{gap:0}
  .hero .photo{justify-self:start;max-width:360px}
  .v,.v:nth-child(2n){padding:20px 0 22px;border-left:0}
  .arch{grid-template-columns:minmax(0,1fr)}
  .link{height:44px}
  .link::before{left:50%;right:auto;top:4px;bottom:4px;border-top:0;border-left:1px dashed var(--faint)}
  .hyp li{grid-template-columns:3rem minmax(0,1fr)}
  .hyp em{grid-column:2}
  .check dl{grid-template-columns:minmax(0,1fr)}.check dt{border-bottom:0;padding-bottom:0}
  .check ol li{grid-template-columns:2rem minmax(0,1fr)}
  .rt{display:none}
  .map thead{display:none}
  .map,.map tbody,.map tr,.map td{display:block}
  .map tr{padding:12px 0;border-bottom:1px solid var(--rule)}
  .map tr.hl{background:color-mix(in srgb,var(--orb) 10%,transparent);box-shadow:inset 3px 0 0 var(--orb);padding-left:12px}
  .map tr.hl td,.map tr.hl td:first-child{background:none;box-shadow:none;padding-left:0}
  .map td{border:0;padding:2px 0;display:grid;grid-template-columns:3.2rem minmax(0,1fr);gap:10px}
  .map td::before{content:attr(data-l);font:400 .75rem/1.9 var(--f-mono);color:var(--dim)}
  .map td:first-child{display:block;margin-bottom:4px}
  .map td:first-child::before{content:none}
  .map td.m{white-space:normal}
}
@media (max-width:520px){
  .back span{display:none}
  .chap a{padding:9px 9px}
  .chap a b{display:none}
  .tldr{grid-template-columns:minmax(0,1fr)}
  .tldr div,.tldr div:nth-child(3){border-left:0;padding-left:0;border-bottom:1px solid var(--rule)}
  .steps{grid-template-columns:minmax(0,1fr)}
  .stages{gap:12px}
  .stages figcaption{font-size:.8125rem}
  .next > div{flex-direction:column;align-items:stretch}
  .next .nx{text-align:left}
}

.hero h1.zh{font-size:clamp(2.4rem,5.4vw,4rem);line-height:1.18;letter-spacing:0}
.steps.alt{grid-template-columns:minmax(0,.9fr) minmax(0,1.8fr) minmax(0,1fr) minmax(0,.9fr) minmax(0,.9fr)}
@media (max-width:860px){.steps.alt{grid-template-columns:minmax(0,1fr)}}

/* ---------- shared extras (MR and later pages) ---------- */
.hero .win.cover{max-width:520px;justify-self:end;width:100%}
.hero .win.cover img{aspect-ratio:834/610;object-fit:cover}
.quotes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:32px}
.quotes p{font-family:var(--f-disp);font-weight:700;font-size:clamp(1.05rem,1.6vw,1.25rem);line-height:1.6;border-top:1px solid var(--ink);padding-top:14px}
.quotes p::before{content:"“";color:var(--orb-ink);margin-right:2px}
.quotes p::after{content:"”";color:var(--orb-ink);margin-left:2px}
.stats{display:flex;flex-wrap:wrap;gap:clamp(24px,5vw,72px);margin-top:36px}
.stats div{display:grid;gap:6px}
.stats b{font:300 clamp(3rem,7vw,5rem)/1 var(--f-mono);letter-spacing:-.05em;font-weight:300}
.stats span{font-size:.9375rem;color:var(--dim);max-width:14em}
.people{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border-top:1px solid var(--ink)}
.people div{padding:14px 14px 16px 0;border-bottom:1px solid var(--rule);display:grid;gap:4px;align-content:start}
.people div:not(:nth-child(5n+1)){padding-left:14px;border-left:1px solid var(--rule)}
.people b{font-size:.9375rem}
.people small{font:400 .75rem/1.5 var(--f-mono);color:var(--faint)}
.people p{font-size:.875rem;color:var(--dim);line-height:1.6;margin-top:4px}
.personas{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.personas > div{border:1px solid var(--rule);border-radius:var(--r);padding:18px 20px;display:grid;gap:8px;align-content:start}
.personas b{font-size:1rem}
.personas p{font-size:.875rem;color:var(--dim);line-height:1.7}
.personas em{font-style:normal;font:400 .75rem/1.6 var(--f-mono);color:var(--orb-ink)}

/* nine-step flow with the reality band */
.flow{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:0}
.flow .band{grid-row:1;font:400 .75rem/1 var(--f-mono);padding:9px 8px;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.flow .b1{grid-column:1 / 2;background:#C9C5BF}
.flow .b2{grid-column:2 / 7;background:#A9A6A2}
.flow .b3{grid-column:7 / 9;background:#7C7C7C;color:#fff}
.flow .b4{grid-column:9 / 10;background:#C9C5BF}
.flow a{grid-row:2;display:grid;gap:4px;align-content:start;padding:14px 10px 12px 0;text-decoration:none;border-top:1px solid var(--ink);position:relative}
.flow a::before{content:"";position:absolute;left:0;top:-5px;width:9px;height:9px;border-radius:50%;background:var(--bg);border:1px solid var(--ink)}
.flow a.has::before{background:var(--orb);border-color:var(--orb)}
.flow a .n{font:400 .75rem/1 var(--f-mono);color:var(--faint);margin-top:6px}
.flow a b{font-size:.9375rem;line-height:1.4}
.flow a span{font-size:.8125rem;color:var(--dim);line-height:1.55}
.flow a:hover b{color:var(--orb-ink)}
.legend{display:flex;gap:18px;flex-wrap:wrap;margin-top:14px;font-size:.8125rem;color:var(--dim)}
.legend i{display:inline-block;width:9px;height:9px;border-radius:50%;margin-right:6px;vertical-align:1px;border:1px solid var(--ink)}
.legend i.on{background:var(--orb);border-color:var(--orb)}

/* step blocks: square media + text */
.stepv{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:clamp(24px,4vw,56px);align-items:center;margin-top:clamp(56px,9vh,88px);scroll-margin-top:80px}
.stepv.flip .media{order:2}
.stepv .media{max-width:460px;width:100%}
.stepv .sq video,.stepv .sq img{aspect-ratio:1/1;object-fit:cover;width:100%;height:auto}
.stepv h3{margin-bottom:14px}
.stepv p{font-size:.9375rem}
.stepv .watch{margin-top:14px;font-size:.875rem;color:var(--dim);padding-left:14px;border-left:2px solid var(--orb)}
.stepv .params{margin-top:14px;font:400 .75rem/1.8 var(--f-mono);color:var(--dim)}
.stepv .params span{white-space:nowrap}
.frames4{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:3px;background:var(--w-bg)}
.frames4 img{aspect-ratio:1/1;object-fit:cover;width:100%;height:auto}

/* principle matrix */
.matrix{width:100%;border-collapse:collapse}
.matrix th{font:400 .75rem/1.3 var(--f-mono);color:var(--dim);font-weight:400;text-align:center;padding:0 0 10px;border-bottom:1px solid var(--ink);white-space:nowrap}
.matrix th:first-child{text-align:left}
.matrix td{padding:14px 0;border-bottom:1px solid var(--rule);text-align:center;vertical-align:middle}
.matrix td:first-child{text-align:left;padding-right:16px}
.matrix td:first-child b{display:block;font-family:var(--f-disp);font-size:1.0625rem;line-height:1.4}
.matrix td:first-child span{font-size:.8125rem;color:var(--dim);line-height:1.6}
.matrix i{display:inline-block;width:12px;height:12px;border-radius:50%;background:var(--ink)}
.matrix i.o{width:4px;height:4px;background:var(--faint)}

.swatches{display:grid;gap:10px}
.swatches div{display:grid;grid-template-columns:5rem minmax(0,1fr);gap:12px;align-items:center;font-size:.8125rem;color:var(--dim)}
.swatches .row{display:flex;height:22px;border-radius:6px;overflow:hidden}
.swatches .row i{flex:1}
.files{list-style:none;margin:0;padding:0;border-top:1px solid var(--ink)}
.files li{border-bottom:1px solid var(--rule)}
.files a{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:16px;padding:14px 0;text-decoration:none;align-items:baseline}
.files a span{font:400 .75rem/1 var(--f-mono);color:var(--dim)}
.files a:hover b{color:var(--orb-ink)}

@media (max-width:860px){
  .people{grid-template-columns:repeat(2,minmax(0,1fr))}
  .people div:not(:nth-child(5n+1)){padding-left:0;border-left:0}
  .people div:nth-child(2n){padding-left:14px;border-left:1px solid var(--rule)}
  .flow{grid-template-columns:repeat(3,minmax(0,1fr));row-gap:0}
  .flow .band{display:none}
  .flow a{grid-row:auto}
}
@media (max-width:760px){
  .quotes,.personas{grid-template-columns:minmax(0,1fr)}
  .quotes{gap:0}
  .quotes p{padding:12px 0}
  .stepv{grid-template-columns:minmax(0,1fr)}
  .stepv.flip .media{order:0}
  .stepv .media{max-width:none}
  .hero .win.cover{justify-self:start}
  .matrix th:not(:first-child){font-size:.6875rem}
  .matrix td:first-child span{display:none}
}
@media (max-width:520px){
  .flow{grid-template-columns:repeat(2,minmax(0,1fr))}
  .matrix td:first-child b{font-size:.875rem}
  .matrix i{width:9px;height:9px}
}

.stepv p + p{margin-top:10px}

/* ---------- 做个人吧 ---------- */
.eg{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.05fr) minmax(0,1.05fr);border-top:1px solid var(--ink)}
.eg > div{padding:16px 18px 18px 0;display:grid;gap:8px;align-content:start}
.eg > div + div{padding-left:18px;border-left:1px solid var(--rule)}
.eg .lb{font:500 .75rem/1 var(--f-mono);letter-spacing:.04em;color:var(--dim)}
.eg .on .lb{color:var(--orb-ink)}
.eg b{font-family:var(--f-disp);font-size:1.125rem;line-height:1.4}
.eg p{font-size:.9375rem;color:var(--dim)}
.levels{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}
.levels > div{border:1px solid var(--rule);border-radius:12px;padding:14px 14px 16px;display:grid;gap:6px;align-content:start}
.levels .n{font:400 .75rem/1 var(--f-mono);color:var(--faint)}
.levels b{font-size:1rem}
.levels .ppl{display:flex;flex-wrap:wrap;gap:3px;margin:4px 0 2px}
.levels .ppl i{width:9px;height:9px;border-radius:50%;background:var(--ink)}
.levels .ppl i.x{background:transparent;border:1px solid var(--off)}
.levels p{font-size:.8125rem;color:var(--dim);line-height:1.6}
.levels .fin{background:var(--w-bg);border-color:var(--w-bg);color:var(--w-ink)}
.levels .fin p,.levels .fin .n{color:#B7C9C4}
.levels .fin .ppl i{background:var(--w-ink)}
.formula{display:flex;flex-wrap:wrap;align-items:stretch;gap:6px;border-top:1px solid var(--ink);padding-top:16px}
.formula span{display:grid;gap:4px;align-content:start;padding:10px 12px;border-radius:10px;background:var(--bg-2);min-width:5.5rem}
.formula span b{font:400 1.125rem/1.2 var(--f-mono);letter-spacing:-.02em}
.formula span small{font-size:.75rem;color:var(--dim)}
.formula span.hl{background:color-mix(in srgb,var(--orb) 18%,var(--bg))}
.formula em{font:300 1.25rem/1 var(--f-mono);font-style:normal;align-self:center;color:var(--dim);padding:0 2px}
.wins{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.wins > div{border:1px solid var(--rule);border-radius:var(--r);padding:18px 20px;display:grid;gap:12px;align-content:start}
.wins .side{font:500 .8125rem/1 var(--f-mono);letter-spacing:.04em}
.wins .h .side{color:var(--orb-ink)}
.wins .a .side{color:var(--off)}
.wins dl{margin:0;display:grid;gap:10px}
.wins dt{font-weight:600;font-size:.9375rem}
.wins dd{margin:2px 0 0;font-size:.875rem;color:var(--dim);line-height:1.7}
.roles{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.roles > div{border:1px solid var(--rule);border-radius:var(--r);padding:16px 18px;display:grid;gap:8px;align-content:start}
.roles .who{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.roles .who b{font-family:var(--f-disp);font-size:1.125rem}
.roles .who span{font:400 .75rem/1 var(--f-mono);color:var(--faint)}
.roles p{font-size:.875rem;line-height:1.7}
.roles .lb{display:inline-block;font:500 .6875rem/1 var(--f-mono);color:var(--dim);margin-right:8px;min-width:2.6em}
.roles .brk{color:var(--orb-ink)}
.roles .brk .lb{color:var(--orb-ink)}
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.cards > div{border:1px solid var(--rule);border-radius:var(--r);padding:16px 18px 18px;display:grid;gap:8px;align-content:start}
.cards .top{display:flex;justify-content:space-between;align-items:baseline;gap:10px}
.cards b{font-size:1rem}
.cards .top span{font:400 .75rem/1 var(--f-mono);color:var(--faint);white-space:nowrap}
.cards p{font-size:.875rem;color:var(--dim);line-height:1.7}
.cards .probe{color:var(--ink);border-top:1px solid var(--rule);padding-top:8px}
.cards .probe::before{content:"怎么测 AI";display:block;font:500 .6875rem/1.6 var(--f-mono);color:var(--orb-ink);letter-spacing:.04em}
.worldq{display:grid;gap:6px;margin:8px 0 24px}
.worldq p{font-family:var(--f-disp);font-weight:700;font-size:clamp(1.2rem,2.2vw,1.6rem);line-height:1.5}
.worldq p:last-child{color:var(--orb-ink)}
.tbl-x{overflow-x:auto}
.tbl-x .map{min-width:720px}
@media (max-width:860px){
  .levels{grid-template-columns:repeat(2,minmax(0,1fr))}
  .levels .fin{grid-column:1 / -1}
  .cards{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:760px){
  .eg{grid-template-columns:minmax(0,1fr)}
  .eg > div + div{padding-left:0;border-left:0;border-top:1px solid var(--rule)}
  .wins,.roles,.cards{grid-template-columns:minmax(0,1fr)}
  .tbl-x .map{min-width:0}
}
.reflb{font:500 .75rem/1 var(--f-mono);letter-spacing:.04em;color:var(--dim);margin:28px 0 10px}
.refs{display:grid;gap:10px}
.refs.r3{grid-template-columns:repeat(3,minmax(0,1fr))}
.refs.r5{grid-template-columns:repeat(5,minmax(0,1fr))}
.refs figure{display:grid;gap:6px;align-content:start}
.refs img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;border-radius:10px;background:var(--bg-2)}
.refs figcaption{font-size:.8125rem;color:var(--dim);line-height:1.5}
.vs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:20px}
.vs > div{display:grid;grid-template-columns:minmax(0,9rem) minmax(0,1fr);grid-template-rows:auto auto 1fr;gap:6px 16px;border:1px solid var(--rule);border-radius:var(--r);padding:14px;align-items:start}
.vs img{grid-row:1 / 4;width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;border-radius:8px;background:var(--bg-2)}
.vs b{font-size:1rem}
.vs p{font-size:.875rem;line-height:1.7;color:var(--dim)}
.vs .ours{color:var(--ink)}
.vs .lb{display:inline-block;font:500 .6875rem/1 var(--f-mono);margin-right:8px;color:var(--faint)}
.vs .ours .lb{color:var(--orb-ink)}
@media (max-width:860px){.refs.r5{grid-template-columns:repeat(3,minmax(0,1fr))}.vs{grid-template-columns:minmax(0,1fr)}}
@media (max-width:520px){.refs.r3,.refs.r5{grid-template-columns:repeat(2,minmax(0,1fr))}.vs > div{grid-template-columns:minmax(0,1fr)}.vs img{grid-row:auto}}
/* inspiration word cloud: tilted words straighten when pointed at */
.cloud{position:relative;height:clamp(300px,34vw,380px);border-top:1px solid var(--ink);border-bottom:1px solid var(--rule)}
.cloud span{position:absolute;left:var(--x);top:var(--y);transform:rotate(var(--r));transform-origin:50% 60%;font-family:var(--f-disp);font-weight:700;font-size:clamp(1.2rem,2.4vw,1.95rem);line-height:1.2;white-space:nowrap;transition:transform .45s cubic-bezier(.65,0,.35,1),color .3s;cursor:default}
.cloud span.core{font-size:clamp(2.2rem,5vw,3.9rem);color:var(--orb-ink)}
.cloud span:hover{transform:rotate(0deg);color:var(--orb-ink)}
.cloud-k{margin-top:12px;font:400 .8125rem/1.6 var(--f-mono);color:var(--dim);letter-spacing:.04em}
@media (max-width:760px){
  .cloud{height:auto;display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:14px 20px;padding:26px 4px}
  .cloud span{position:static;transform:rotate(calc(var(--r) * .6))}
  .cloud span.core{order:-1;flex-basis:100%;text-align:center;transform:rotate(-2deg)}
}
@media (prefers-reduced-motion:reduce){.cloud span{transition:none}}