:root{--_esther-ds:"esthersjw-v1";--paper:#fefcf6;--sheet:#fffef9;--ink:#20283c;--muted:#555e70;--red:#df4961;--red-ink:#b52d48;--blue:#2469c8;--rule:#dce3ed;--serif:"Noto Serif SC","Songti SC","STSong","SimSun",serif}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:100px}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.8 "PingFang SC","Microsoft YaHei",sans-serif}
button,input{font:inherit}
button,a{-webkit-tap-highlight-color:transparent}
button{color:inherit;cursor:pointer}
a{color:inherit;text-decoration:none}
button{border:0}
button:disabled{cursor:default}
::selection{background:#f4d758;color:var(--ink)}
:focus-visible{outline:3px solid var(--red);outline-offset:6px}
h1,h2,h3,p{margin:0}
h1,h2,h3{font-family:var(--serif);font-weight:700}
svg{display:block}
img{display:block;max-width:100%;height:auto}
.wrap{width:min(1280px,calc(100% - 112px));margin-inline:auto}
.skip{position:fixed;top:-100px;left:24px;background:var(--ink);color:var(--paper);padding:12px 20px;z-index:50}
.skip:focus{top:12px}
.masthead{display:flex;align-items:center;justify-content:flex-end;gap:24px;padding-block:23px;border-bottom:1px solid var(--rule)}
nav{display:flex;gap:34px}
nav a{font-size:14px;padding:8px 0}
nav a:hover{text-decoration:underline;text-decoration-color:var(--red);text-underline-offset:7px}
.hero{display:grid;grid-template-columns:.92fr 1.08fr;gap:32px;align-items:center;min-height:740px;padding-block:84px 95px}
.hero-copy{position:relative;z-index:1}
.eyebrow{font-size:14px;letter-spacing:.12em;color:var(--muted);margin-bottom:24px}
.tiny-cross{font-size:24px;color:var(--red);vertical-align:-2px;margin-right:8px}
h1{font-size:clamp(3.2rem,5.6vw,5.3rem);line-height:1.32;letter-spacing:-.07em}
.title-mark{color:var(--blue);position:relative;white-space:nowrap}
.title-mark svg{position:absolute;left:-3%;width:106%;bottom:-10px;stroke:#f4d758;stroke-width:4;fill:none}
.intro{margin-top:34px;color:var(--muted)}
.text-link{display:inline-flex;align-items:center;gap:25px;background:none;padding:8px 0;border-bottom:1px solid currentColor;font-size:15px;text-decoration:none}
.text-link span{font-size:22px;transition:transform .25s}
.text-link:hover span{transform:translate(3px,-3px)}
.hero .text-link{margin-top:32px}
.math-scene{position:relative;padding:27px 0 50px 15px;transform:rotate(-2deg)}
.scene-tag{position:absolute;top:0;right:26px;font:italic 15px var(--serif);color:var(--muted)}
.paper{background:var(--sheet);border:1px solid #d5e1ef;box-shadow:2px 5px 0 #e4edfa,8px 18px 40px #245a9e12;position:relative;background-image:radial-gradient(#8db4e54d .65px,transparent .65px);background-size:20px 20px}
.paper::before{content:"";position:absolute;top:-11px;left:40%;width:94px;height:26px;background:#f4d758cc;transform:rotate(5deg);z-index:1}
.paper-top{display:flex;justify-content:space-between;border-bottom:1px solid #d5e1ef;padding:15px 22px;color:var(--muted);font-size:14px;background:#f7faffd9}
.paper svg{width:100%;height:auto;overflow:visible}
.orbit{stroke:#658abe;stroke-width:1.5;fill:none}
.triangle-fill{fill:#f4d75855}
.diameter{stroke:#658abe;stroke-width:1.2;stroke-dasharray:5 5}
.triangle-line{stroke:var(--blue);stroke-width:2.5;fill:none}
.right-angle{stroke:var(--red);stroke-width:2;fill:none}
.fixed-dot,.center-dot{fill:var(--blue)}
.math-label{font:italic 21px Georgia,serif;fill:var(--blue)}
#point-label{fill:var(--red-ink)}
.point-halo{fill:transparent}
.point-ring{fill:var(--sheet);stroke:var(--red);stroke-width:2}
.point-dot{fill:var(--red)}
#point-handle{cursor:grab;touch-action:none}
#point-handle:active{cursor:grabbing}
.diagram-note{font:18px var(--serif);fill:var(--muted)}
.experiment-controls{display:flex;align-items:center;gap:12px;border-top:1px solid var(--rule);padding:12px 18px;background:var(--sheet);font-size:14px;position:relative}
.experiment-controls label{white-space:nowrap}
.experiment-controls input{min-width:30px;width:100%;accent-color:var(--red);height:28px}
.experiment-controls button{background:none;white-space:nowrap;padding:8px 5px}
.experiment-controls button:hover{color:var(--red-ink)}
.angle-note{position:absolute;right:-15px;bottom:19px;width:191px;min-height:110px;padding:17px 19px;background:#f4d758;transform:rotate(8deg);box-shadow:2px 6px 12px #244e7d14}
.angle-note span{font-size:14px}
.angle-note strong{display:block;font:italic 24px/1.6 Georgia,serif;color:var(--ink)}
.angle-note svg{height:15px;width:125px;fill:none;stroke:var(--red);stroke-width:1.4}
.scene-stamp{position:absolute;left:-5px;bottom:30px;color:var(--red-ink);border:2px solid var(--red);padding:7px;font:17px/1.25 var(--serif);transform:rotate(-8deg)}
.scene-caption{font-size:14px;color:var(--muted);position:absolute;bottom:-6px;left:76px;transform:rotate(2deg)}
.scene-caption span{margin-left:14px;color:var(--red)}
.section{padding-block:110px}
.works{border-top:1px solid var(--rule)}
.section-heading{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:55px}
h2{font-size:clamp(2rem,3.5vw,3.1rem);line-height:1.45;letter-spacing:-.035em}
.section-heading>p{color:var(--muted);padding-bottom:8px}
.project-visual{display:block;width:100%;padding:32px 40px 0;background:#dcecff;text-align:left;overflow:hidden}
.window-top{display:flex;align-items:center;justify-content:space-between;gap:20px;background:var(--sheet);padding:15px 18px;border:1px solid #c3d7f0;border-bottom:0;font-size:14px}
.window-top span:nth-child(2){margin-left:auto;color:var(--muted)}
.window-top i{font:22px Georgia,serif}
.project-visual img{width:100%;border:1px solid #c3d7f0;transition:transform .6s}
.project-visual:hover img{transform:translateY(-4px)}
.project-info{display:grid;grid-template-columns:1fr 1fr auto;align-items:center;gap:30px;margin-top:25px}
.project-title{display:flex;gap:23px;align-items:center}
.project-index{font:italic 17px Georgia,var(--serif);color:var(--red-ink)}
.project-title h3{font-size:28px}
.project-info>p{color:var(--muted);font-size:15px}
.workshop-project{display:grid;grid-template-columns:.9fr 1.1fr;gap:75px;margin-top:110px;align-items:center;padding:64px;background:#fff0b2}
.workshop-copy h3{font-size:clamp(1.8rem,2.6vw,2.5rem);line-height:1.5;margin-top:20px}
.workshop-copy>p{color:var(--muted);margin-top:24px;max-width:24em}
.workshop-copy .text-link{margin-top:24px}
.workshop-sign{display:block;font:italic 17px var(--serif);color:var(--muted);margin-top:60px}
.sheet-stage{position:relative;display:block;width:100%;padding:10px 15px 40px;background:none}
.sheet-stage img{position:relative;width:100%;transform:rotate(3deg);box-shadow:0 10px 20px #735d281a;transition:transform .45s}
.sheet-stage:hover img{transform:rotate(0deg) translateY(-5px)}
.sheet-back{position:absolute;inset:13px 15px 50px;background:var(--sheet);transform:rotate(-5deg);box-shadow:0 5px 20px #735d2810}
.sheet-label{position:absolute;bottom:0;left:15px;font-size:14px}
.notes{background:#2055a5;color:var(--paper)}
.notes-layout{display:grid;grid-template-columns:1fr 1fr;gap:100px}
.notes .eyebrow{color:#d9e9ff}
.note-doodle{display:block;font:140px/1.2 Georgia,serif;color:#f4d758;margin-top:20px}
.note-category{font-size:14px;color:#d9e9ff}
.notes h3{font-size:clamp(1.7rem,3vw,2.6rem);line-height:1.5;margin-block:16px 30px}
.notes article p{color:#f5f8ff;margin-top:18px;max-width:31em}
.about{display:grid;grid-template-columns:160px 1fr auto;gap:60px;align-items:center}
.about-monogram{font:700 64px/1.25 var(--serif);letter-spacing:-.08em}

.about p:last-child{max-width:42em;color:var(--muted);margin-top:24px}
.back-top{border:1px solid #b5c9e4;width:52px;height:52px;display:grid;place-items:center;font-size:24px;border-radius:50%}
.back-top:hover{background:#dcecff}
footer{border-top:1px solid var(--rule);padding:26px 0;color:var(--muted);font-size:14px}
.footer-inner,.footer-meta,.filings{display:flex;align-items:center;flex-wrap:wrap;gap:12px 24px}
.footer-inner{justify-content:space-between}
.filing-link{display:inline-flex;gap:7px;align-items:center}
.filing-link img{width:18px;height:20px}
footer a:hover{text-decoration:underline;text-underline-offset:4px}
dialog{width:min(1050px,calc(100% - 40px));max-height:90dvh;overflow:auto;padding:0;border:1px solid var(--rule);background:var(--paper);color:var(--ink);box-shadow:0 30px 100px #10171055}
dialog::backdrop{background:#182943b3}
.dialog-top{position:sticky;top:0;display:flex;justify-content:space-between;align-items:center;background:var(--paper);border-bottom:1px solid var(--rule);padding:14px 28px;z-index:1;font-size:14px}
.close-dialog{padding:8px 12px;background:var(--ink);color:var(--paper)}
.dialog-copy{padding:30px 40px}
.dialog-copy p{max-width:46em;margin-top:16px;color:var(--muted)}
dialog>img{width:100%}
dialog>img.portrait{width:min(650px,calc(100% - 50px));margin:0 auto 30px}
.reveal{transition:opacity .65s,transform .65s}
.reveal.pending{opacity:0;transform:translateY(28px)}
.hero-copy{animation:appear .8s both}
.math-scene{animation:paper-in 1s both}
.triangle-line{stroke-dasharray:700;stroke-dashoffset:0;animation:draw 1.5s .2s both}
@keyframes appear{from{opacity:0;transform:translateY(20px)}
to{opacity:1;transform:translateY(0)}
}
@keyframes paper-in{from{opacity:0;transform:translateY(25px) rotate(1deg)}
to{opacity:1;transform:translateY(0) rotate(-2deg)}
}
@keyframes draw{from{stroke-dashoffset:700}
to{stroke-dashoffset:0}
}
@media(min-width:1500px){.hero{min-height:800px}
}
@media(max-width:1050px){.wrap{width:calc(100% - 64px)}
.hero{gap:20px;min-height:680px}
h1{font-size:clamp(3.1rem,5.7vw,4.2rem)}
.angle-note{right:-7px;bottom:3px}
.scene-caption{left:10px;bottom:-34px}
.scene-stamp{bottom:20px;left:-15px}
.project-info{grid-template-columns:1fr auto}
.project-info>p{grid-row:2;grid-column:1/-1}
.workshop-project{gap:40px;padding:45px}
.notes-layout{gap:60px}
.about{grid-template-columns:110px 1fr auto;gap:32px}
.about-monogram{font-size:48px}
}
@media(max-width:900px){.hero{grid-template-columns:1fr;gap:55px;padding-block:60px 100px}
.hero-copy{max-width:650px}
h1{font-size:clamp(3.4rem,9vw,5rem)}
.math-scene{width:min(600px,95%);justify-self:end}
.section{padding-block:80px}
.section-heading{align-items:start}
.workshop-project{margin-top:80px;padding:40px 30px}
.workshop-sign{margin-top:35px}
.notes-layout{gap:40px}
.about{grid-template-columns:85px 1fr;gap:30px}
.about-monogram{font-size:40px}
.back-top{grid-column:2}
.project-visual{padding:24px 24px 0}
}
@media(max-width:600px){.wrap{width:calc(100% - 40px)}
.masthead{padding-block:19px;gap:15px;flex-wrap:wrap}
nav{gap:24px}
.hero{padding-block:40px 80px;gap:35px}
h1{font-size:clamp(2.8rem,10.9vw,4rem)}
.eyebrow{font-size:14px;margin-bottom:20px;letter-spacing:.06em}
.intro{margin-top:27px}
.math-scene{width:100%;padding-left:0;padding-bottom:62px}
.paper-top{padding:12px}
.experiment-controls{gap:6px;flex-wrap:wrap;padding:9px 12px}
.experiment-controls label{font-size:14px}
.experiment-controls input{flex:1;min-width:75px}
.experiment-controls button{padding:8px 5px}
.angle-note{width:165px;min-height:95px;padding:12px 15px;right:0;bottom:4px}
.angle-note strong{font-size:21px}
.scene-stamp{left:5px;bottom:15px;font-size:15px}
.scene-caption{left:0;bottom:-32px;font-size:14px}
.scene-tag{right:0;font-size:14px}
.section{padding-block:60px}
.section-heading{display:block;margin-bottom:30px}
.section-heading>p{margin-top:22px}
h2{font-size:2rem}
.project-visual{padding:15px 14px 0}
.window-top{padding:10px;font-size:14px}
.window-top span:nth-child(2){display:none}
.window-top i{margin-left:auto}
.project-info{gap:12px}
.project-title{gap:14px}
.project-title h3{font-size:24px}
.project-info>.text-link{font-size:14px;gap:10px}
.project-info>p{font-size:15px}
.workshop-project{display:flex;flex-direction:column;gap:30px;padding:30px 22px;margin-top:60px}
.workshop-copy h3{font-size:1.8rem}
.workshop-copy>p{margin-top:18px}
.workshop-sign{display:none}
.sheet-stage{width:95%}
.notes-layout{grid-template-columns:1fr;gap:32px}
.note-doodle{display:none}
.notes h3{font-size:1.8rem}
.notes article{border-top:1px solid #6b95d0;padding-top:26px}
.about{grid-template-columns:1fr;gap:24px}
.about-monogram{font-size:40px}
.about h2{font-size:1.9rem}
.back-top{grid-column:auto}
.footer-inner,.filings{align-items:flex-start;flex-direction:column}
.filings{gap:10px}
dialog{width:calc(100% - 20px)}
.dialog-top{padding:12px 18px}
.dialog-copy{padding:25px 20px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}
*,*::before,*::after{animation:none!important;transition:none!important}
.reveal.pending{opacity:1;transform:none}
}
/* Keep the loose notes below the paper, clear of all experiment controls. */
.math-scene{padding-bottom:145px}
.angle-note{bottom:17px;pointer-events:none}
.scene-stamp{bottom:37px;pointer-events:none}
.scene-caption{bottom:-5px}
.no-script{padding:12px 18px;font-size:14px;color:var(--muted)}
button:disabled{opacity:.65}
@media(max-width:1050px){.angle-note{bottom:17px}
.scene-stamp{bottom:37px}
.scene-caption{bottom:-5px}
}
@media(max-width:600px){.math-scene{padding-bottom:125px}
.angle-note{bottom:13px}
.scene-stamp{bottom:29px}
.scene-caption{bottom:-12px}
}

.anime-project{margin-top:110px}
.anime-project .project-visual{background:#ffe5df}
@media(max-width:900px){.anime-project{margin-top:80px}}
@media(max-width:600px){.anime-project{margin-top:60px}.about-monogram{font-size:56px}}

/* 入场位移不作为刷新时恢复滚动位置的锚点。 */
.hero,.reveal{overflow-anchor:none}
.site-mark{display:flex;align-items:center;margin-right:auto;flex-shrink:0}
.site-mark img{width:62px;height:34px}

/* 明亮的蓝、黄、红延续纸上实验的气质。 */
.eyebrow{color:var(--blue)}
.hero .text-link{background:var(--blue);color:var(--sheet);border:0;border-radius:7px;padding:12px 22px;gap:30px}
.hero .text-link:hover{background:#1d58aa}
.scene-tag{color:var(--blue)}
.paper-top{color:#325e98}
.project-index{color:var(--blue)}
.about-monogram{color:var(--blue)}
nav a{transition:color .2s}
nav a:hover{color:var(--blue);text-decoration-color:#f4d758}
.site-mark{min-height:40px;transition:opacity .2s}
.site-mark:hover{opacity:.78}