*{box-sizing:border-box}
:root{--canvas:#f5f7fa;--paper:#fff;--ink:#202a3e;--muted:#52617a;--line:#ccd5e3;--blue:#2058ce;--selection:#e8efff}
html{scroll-behavior:smooth;scroll-padding-top:24px}
body{margin:0;background:var(--canvas);color:var(--ink);font:16px/1.65 "Avenir Next","Segoe UI","PingFang SC",sans-serif}
a{color:var(--blue);text-underline-offset:4px}
button{font:inherit;cursor:pointer}
button:disabled{cursor:wait}
button,a{touch-action:manipulation}
:focus-visible{outline:3px solid var(--blue);outline-offset:4px}
[hidden]{display:none!important}
.shell{max-width:1280px;margin:auto;padding:0 40px}
.skip-link{position:absolute;top:-80px;left:24px;z-index:10;padding:12px 20px;background:white}
.skip-link:focus{top:12px}
.top,footer{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:24px 0}
.top>div,footer>div{display:flex;gap:24px}
.brand{font-size:20px;font-weight:750;letter-spacing:-.6px;color:var(--ink);text-decoration:none}
.brand-mark{display:inline-block;margin-left:14px;color:var(--blue);font-size:19px}
.top>div a{font-size:14px}
.hero{padding:24px 0 36px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:64px;align-items:center}
h1{font-size:clamp(34px,3.4vw,46px);line-height:1.2;letter-spacing:-1.4px;margin:0;max-width:600px;text-wrap:balance}
html:lang(zh-CN) h1{line-height:1.35;letter-spacing:-1px;word-break:normal}
.hero h1 span{display:inline-block}
.hero-copy p{font-size:17px;color:var(--muted);margin:0 0 20px;max-width:540px}
.actions{display:flex;align-items:center;gap:24px;flex-wrap:wrap}
.primary{display:inline-block;background:var(--blue);color:white;padding:10px 17px;border-radius:5px;text-decoration:none;font-weight:650}
h2{font-size:27px;line-height:1.35;letter-spacing:-.5px;margin:0 0 12px}
h3{font-size:19px;line-height:1.45;margin:0 0 12px}
.section-heading{display:flex;align-items:baseline;justify-content:space-between;gap:16px}
.section-heading>a{font-size:14px;white-space:nowrap}
.section-note{max-width:780px;color:var(--muted);margin:0 0 24px;font-size:15px}
.visual-menu{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:16px;margin:0 0 28px}
.visual-choice{min-width:0;display:flex;flex-direction:column;background:var(--paper);border:1px solid var(--line);border-radius:7px;text-decoration:none;color:var(--ink);overflow:hidden}
.visual-choice:first-child{grid-row:span 2}
.visual-choice[aria-current=true]{border-color:var(--blue);box-shadow:0 0 0 2px var(--blue)}
.visual-choice:hover{border-color:var(--blue)}
.choice-image{display:flex;align-items:center;justify-content:center;min-height:0;height:145px;padding:10px;background:#e9edf4;overflow:hidden}
.choice-image img{display:block;width:100%;height:100%;object-fit:cover;object-position:center}
.visual-choice:first-child .choice-image img{object-fit:contain}
.visual-choice:first-child .choice-image{flex:1;min-height:300px;padding:16px;background:#e1e6ef}
.choice-caption{display:block;padding:10px 14px 12px}
.choice-title{display:block;font-size:14px;font-weight:650;line-height:1.4;overflow-wrap:anywhere;margin-bottom:5px}
.visual-choice:first-child .choice-title{font-size:19px}
.example-meta{display:flex;align-items:center;gap:9px;flex-wrap:wrap;font-size:12px;line-height:1.5;color:var(--muted)}
.theme-label{padding:0 6px;border:1px solid var(--line);border-radius:3px;color:var(--muted);background:var(--paper)}
.demo-viewer{padding:24px;background:var(--paper);border:1px solid var(--line);border-radius:8px}
.demo-panel{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);gap:28px;align-items:start;scroll-margin-top:24px}
.demo-panel+.demo-panel{margin-top:32px;padding-top:32px;border-top:1px solid var(--line)}
.demo-panel[hidden]+.demo-panel{margin-top:0;padding-top:0;border-top:0}
.source{min-width:0;padding:8px 0}
.source h3{font-size:24px;margin:12px 0}
.example-note{font-size:15px;color:var(--muted);margin:0 0 22px}
.prompt-details{margin:0 0 18px}
.prompt-details summary{font-size:14px}
.prompt-details blockquote{margin:14px 0 0}
blockquote{margin:0 0 20px;font-size:15px;line-height:1.85;white-space:pre-line;overflow-wrap:anywhere}
.copy{color:var(--blue);background:white;border:1px solid #aab9d1;padding:9px 13px;border-radius:5px;font-size:14px;font-weight:600;text-align:left}
.copy:hover{background:var(--selection)}
figure{min-width:0;margin:0}
figcaption{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;padding:12px 0 0;font-size:12px;color:var(--muted)}
.image-link{display:block}
.image-link img{display:block;width:100%;height:auto}
.file-links{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:18px;font-size:13px;font-weight:600}
section.start,section.proof,section#examples{margin-top:64px}
.gallery-grid{columns:2;column-gap:28px}
.gallery-item{break-inside:avoid;border:1px solid var(--line);background:var(--paper);border-radius:7px;overflow:hidden;margin:0 0 28px}
.gallery-item>.image-link{padding:18px;background:#e9edf4;border-bottom:1px solid var(--line)}
.gallery-copy{padding:22px}
.gallery-copy h3{margin:8px 0 0}
.gallery-copy>p{font-size:14px;color:var(--muted)}
.gallery-copy blockquote{font-size:14px}
.steps{display:grid;grid-template-columns:1.1fr 1fr;gap:44px;margin-top:28px}
.steps p{color:var(--muted);max-width:620px}
.command{background:var(--paper);border:1px solid var(--line);border-radius:7px;padding:17px;display:flex;flex-wrap:wrap;gap:16px}
.command code{font-size:14px;overflow-wrap:anywhere;align-self:center}
.local{margin-top:28px;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
summary{cursor:pointer;color:var(--blue);font-weight:600}
pre{font-size:14px;background:#e8edf5;color:var(--ink);padding:20px;overflow:auto;border-radius:6px}
.proof-items{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:36px;margin-top:28px}
.proof-items p,.boundary{color:var(--muted);font-size:15px}
.boundary{border-left:3px solid var(--line);padding-left:18px;margin-top:26px;max-width:900px}
footer{border-top:1px solid var(--line);margin-top:52px;color:var(--muted);font-size:14px}
#copy-status{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);max-width:calc(100% - 32px);margin:0;background:var(--ink);color:white;border-radius:6px;padding:10px 20px;box-shadow:0 4px 20px #202a3e20;z-index:3}
#copy-status:empty{display:none}
.present-intro{padding:24px 0 12px}
.present-intro h1{max-width:900px;margin-bottom:16px}
.showcase{margin:32px 0;padding:28px;background:var(--paper);border:1px solid var(--line);border-radius:8px;scroll-margin-top:24px}
.showcase-steps{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 24px}
.showcase-steps button{padding:9px 14px;background:var(--canvas);color:var(--muted);border:1px solid var(--line);border-radius:5px;font-size:14px}
.showcase-steps button[aria-pressed=true]{background:var(--blue);border-color:var(--blue);color:white}
.screen{margin:24px 0 0;max-width:900px}
.screen blockquote{max-width:72ch;font-size:17px}
.screen>p{max-width:65ch}
.result-screen{max-width:960px;margin:0 auto}
.result-screen img{max-height:780px;object-fit:contain;object-position:top}
.result-screen>p{text-align:center;margin:12px auto 0;font-size:14px}
.present-next{max-width:850px;margin:52px 0}
@media(max-width:1000px){
  .shell{padding:0 24px}
  .hero{gap:32px}
  .choice-image{height:128px;padding:8px}
  .visual-choice:first-child .choice-image{padding:10px;min-height:260px}
  .choice-caption{padding:9px 10px}
  .demo-panel{grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:22px}
  .demo-viewer{padding:20px}
  .steps{gap:24px}
}
@media(max-width:760px){
  html{scroll-padding-top:16px}
  .shell{padding:0 18px}
  .brand-mark{display:none}
  .top{gap:16px;padding:20px 0}
  .top>div{gap:16px}
  .brand{font-size:18px}
  .top>div a{font-size:13px}
  .hero{grid-template-columns:1fr;gap:20px;padding:20px 0 32px}
  .hero-copy p{font-size:16px;margin-bottom:18px}
  h1{font-size:clamp(28px,8.5vw,35px);max-width:560px}
  h2{font-size:23px}
  .section-heading{flex-wrap:wrap;gap:6px;margin-bottom:10px}
  .section-heading h2{margin-bottom:0}
  .section-note{font-size:14px;margin-bottom:20px}
  .visual-menu{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
  .visual-choice:first-child{grid-row:auto}
  .choice-image,.visual-choice:first-child .choice-image{height:145px;min-height:0;padding:8px;flex:none}
  .choice-title,.visual-choice:first-child .choice-title{font-size:14px}
  .choice-caption{padding:9px 10px 10px}
  .visual-choice:last-child:nth-child(odd){grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;align-items:center}
  .visual-choice:last-child:nth-child(odd) .choice-image{height:148px}
  .example-meta{gap:6px}
  .demo-panel,.steps,.proof-items{grid-template-columns:1fr;gap:22px}
  .demo-viewer{padding:16px}
  .source{padding:0}
  .source h3{font-size:22px}
  .demo-panel+.demo-panel{margin-top:24px;padding-top:24px}
  .gallery-grid{columns:1}
  .gallery-item>.image-link{padding:12px}
  .gallery-copy{padding:18px}
  .start,.proof,#examples,.demo-panel,.showcase{scroll-margin-top:16px}
  section.start,section.proof,section#examples{margin-top:44px}
  footer{align-items:flex-start;flex-direction:column;gap:12px}
  .proof-items{gap:16px}
  .proof-items p{margin-bottom:0}
  .showcase{padding:18px}
  .showcase .section-heading .example-meta{margin-top:8px}
  .showcase-steps{gap:6px;margin-bottom:20px}
  .showcase-steps button{padding:8px 10px;font-size:13px}
  .screen blockquote{font-size:16px}
}
@media(max-width:380px){
  .shell{padding:0 14px}
  .top>div{gap:12px}
  .brand{font-size:17px}
  .choice-image,.visual-choice:first-child .choice-image{height:120px}
  .choice-title,.visual-choice:first-child .choice-title{font-size:13px}
  .choice-caption{padding:8px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}