@font-face{font-family:"Source Han Sans CN";src:url("assets/fonts/SourceHanSansCN-Light.woff") format("woff");font-weight:300;font-display:swap}
@font-face{font-family:"Source Han Sans CN";src:url("assets/fonts/SourceHanSansCN-Regular.woff") format("woff");font-weight:350 500;font-display:swap}
@font-face{font-family:"Source Han Sans CN";src:url("assets/fonts/SourceHanSansCN-Bold.woff") format("woff");font-weight:600 900;font-display:swap}
@font-face{font-family:Urbanist;src:url("assets/fonts/Urbanist.ttf") format("truetype");font-weight:100 900;font-display:swap}
@font-face{font-family:"Open Sans";src:url("assets/fonts/OpenSans.ttf") format("truetype");font-weight:300 800;font-display:swap}
:root{--scale:1;--cover-scale:1;--orange:#ff5b2e;--ink:#050505;--header-height:calc(55px * var(--scale));--page-x:3.35vw;--ease:cubic-bezier(.2,.75,.15,1);color-scheme:light}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:var(--header-height)}
/* Lenis owns desktop scrolling; small screens keep the native browser scroll. */
html.lenis,html.lenis body{height:auto}
html.lenis.lenis-smooth{scroll-behavior:auto!important}
.lenis.lenis-smooth [data-lenis-prevent]{overscroll-behavior:contain}
.lenis.lenis-stopped{overflow:clip}
body{margin:0;background:#fff;color:#393d3d;font-family:-apple-system,BlinkMacSystemFont,"Source Han Sans CN",sans-serif;-webkit-font-smoothing:antialiased;text-rendering:geometricPrecision}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer}
button,a{-webkit-tap-highlight-color:transparent}
button:focus-visible,a:focus-visible{outline:2px solid var(--orange);outline-offset:5px}
::selection{background:var(--orange);color:#050505}
[hidden]{display:none!important}
.skip-link{position:fixed;top:-90px;left:24px;z-index:300;padding:12px 18px;background:var(--orange);color:#050505}
.skip-link:focus{top:12px}
.site-header{position:fixed;z-index:100;inset:0 0 auto;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;height:var(--header-height);padding:0 var(--page-x);backdrop-filter:blur(18px) saturate(120%);-webkit-backdrop-filter:blur(18px) saturate(120%);background:rgba(255,255,255,.72);color:#050505;border-bottom:1px solid rgba(5,5,5,.07);transition:color .3s ease,background-color .3s ease,border-color .3s ease}
.site-header[data-theme=dark]{background:rgba(12,12,12,.66);color:white;border-bottom-color:rgba(255,255,255,.05)}
.back-link{display:flex;align-items:center;gap:calc(10px * var(--scale));justify-self:start;font-size:calc(13px * var(--scale))}
.back-link>span:last-child{position:relative}
.back-link>span:last-child:after{content:"";position:absolute;left:0;right:100%;bottom:-6px;height:1px;background:currentColor;transition:right .25s ease}
.back-link:hover>span:last-child:after{right:0}
.project-name{font-size:calc(13px * var(--scale));font-weight:400}
.language-control{justify-self:end;display:flex;gap:calc(7px * var(--scale));font-size:calc(12px * var(--scale))}
.language-control button{padding:0;border:0;background:none;opacity:.5;transition:opacity .2s ease}
.language-control button.active{opacity:1;font-weight:700}
.reading-progress{position:absolute;bottom:-1px;left:0;width:100%;height:1.5px;pointer-events:none}
.reading-progress span{display:block;width:100%;height:100%;background:var(--orange);transform:scaleX(.0572917);transform-origin:left;will-change:transform}
.panel{position:relative;width:100%;overflow:hidden;background:white;scroll-margin-top:0}
/* 缩短研究方法与设计需求之间的留白 */
#research {
  margin-bottom: calc(-380px * var(--scale));
}
.artboard{position:relative;width:1440px;transform:scale(var(--scale));transform-origin:top left;isolation:isolate;overflow:hidden}
.cover{background:#1b1917}
.cover .artboard{transform:scale(var(--cover-scale));background:transparent}
.layer{position:absolute;margin:0;padding:0}
.artwork{object-fit:fill;max-width:none}
/* 目标用户群体图：支持元素使用灰色，说明文字使用深灰；两类核心用户维持黑底白字。 */
.users-map{isolation:isolate}
.users-map>img{position:absolute;inset:0;display:block;width:100%;height:100%;max-width:none;object-fit:fill}
.users-map-base{opacity:.454902}
.users-map-paragraph{opacity:.446043;clip-path:inset(43.8% 13.8% 46.6% 52.5%);mix-blend-mode:multiply}
.users-map-primary{opacity:1}
.users-map-lazy{clip-path:ellipse(11.1% 12.9% at 76.8% 20.9%)}
.users-map-stubborn{clip-path:ellipse(11.1% 12.9% at 62.1% 78.3%)}
.research-rule,.research-timeline-line{background:#d2d2d2;pointer-events:none}
.research-intro-line{background:#d2d2d2;pointer-events:none}
.research-timeline-progress{position:absolute;z-index:1;left:694.213px;top:235.837px;width:1px;height:0;background:#4d4d4d;pointer-events:none}
.research-rule-progress{position:absolute;z-index:1;width:var(--rule-width);height:1px;background:#4d4d4d;pointer-events:none;transform:scaleX(0);transform-origin:center;transition:transform .32s cubic-bezier(.2,.75,.15,1)}
.research-rule-progress.is-active{transform:scaleX(1)}
/* Centre the original top marker on the 1px CSS timeline. */
#research [data-node-id="3640:2462"]{left:688.645px!important}
#research [data-node-id="3640:2462"],#research [data-node-id="3640:2463"],#research [data-node-id="3642:2686"],#research [data-node-id="3642:2719"],#research [data-node-id="3642:2720"],#research [data-node-id="3642:2736"],#research [data-node-id="3642:2744"],#research [data-node-id="3642:2730"],#research [data-node-id="3642:2742"],#research [data-node-id="3642:2731"],#research [data-node-id="3642:2743"]{z-index:2;transition:background-color .18s ease,border-color .18s ease,color .18s ease}
#research .research-active-dot{background:#4d4d4d!important}
#research .research-active-label{background:#4d4d4d!important;border-color:#4d4d4d!important}
#research .research-active-label-text,#research .research-active-label-text span{color:#fff!important}
/* 研究方法页的两个评估标题使用同一字体文件与字重。 */
#research [data-node-id="3642:2688"],
#research [data-node-id="3642:2688"] span,
#research [data-node-id="3642:2700"],
#research [data-node-id="3642:2700"] span {
  font-family:"PingFang SC",sans-serif!important;
  font-weight:600!important;
  font-synthesis:none;
  -webkit-font-smoothing:auto;
}
.project-video{display:block;max-width:none;object-fit:cover;overflow:hidden;border:0;border-radius:16px;background:#050505;box-shadow:0 1px 3px rgba(5,5,5,.12)}
.project-video:focus-visible{outline:2px solid var(--orange);outline-offset:5px}
.vector{max-width:none;pointer-events:none}
.text{white-space:pre-wrap;overflow:visible;word-break:normal;overflow-wrap:normal;font-synthesis:none}
.text span{white-space:inherit;font-synthesis:none}
/* 所有正文加粗文字：黑色，70% 不透明度 */
.panel p.text > span[style*="font-weight:700"] {
  color: rgba(0, 0, 0, 0.7) !important;
}
.shape{pointer-events:none}
.chapter-nav{position:fixed;z-index:50;left:calc(48px * var(--scale));top:50%;transform:translateY(-50%);width:calc(130px * var(--scale));display:grid;gap:calc(14px * var(--scale));opacity:0;visibility:hidden;transition:opacity .08s ease,visibility 0s linear .08s}
.chapter-nav.is-visible{opacity:1;visibility:visible;transition:opacity .08s ease,visibility 0s}
.chapter-nav a{display:flex;align-items:center;gap:calc(9px * var(--scale));font-family:"Source Han Sans CN",sans-serif;font-weight:300;font-size:calc(11px * var(--scale));line-height:calc(13px * var(--scale));white-space:nowrap;color:#8d8d8d;transition:color .22s ease,transform .22s ease}
.chapter-dot{width:calc(8px * var(--scale));height:calc(8px * var(--scale));flex-shrink:0;border:1px solid currentColor;border-radius:50%;transition:background-color .25s ease,border-color .25s ease}
.chapter-nav a[aria-current=location]{color:#1a1a1a;font-weight:500}
.chapter-nav a[aria-current=location] .chapter-dot {
  background: currentColor;
  border-color: currentColor;
}
.chapter-nav a:hover{color:var(--orange);transform:translateX(3px)}
.round-arrow{display:grid;place-items:center;width:58px;height:58px;border:1.208px solid #9a9a9a;border-radius:50%;color:#9a9a9a;font-size:24.167px;line-height:1;transition:background .25s ease,color .25s ease,border-color .25s ease,transform .25s ease}
.cover-arrow{position:absolute;left:1317px;top:680px}
.cover-arrow:hover,.cover-arrow:focus-visible,.cover-arrow.is-scroll-active{background:var(--orange);border-color:var(--orange);color:#050505}
.cover-arrow span{display:block;transition:transform .25s ease}
.cover-arrow:hover span,.cover-arrow:focus-visible span,.cover-arrow.is-scroll-active span{transform:rotate(45deg)}
.brand-title{margin:0;padding:0}
.brand-title img{display:block;width:100%;height:100%}
.artboard{background:#fff}
.cover .artboard{background:transparent}
.panel:focus{outline:none}
.project-pagination{position:absolute;left:0;right:0;top:770px;height:427px;background:#fff}
.project-switch{position:absolute;top:123px;display:flex;align-items:center;gap:24px;height:179px}
.project-switch.previous{left:94px}
.project-switch.next{right:95px}
.project-thumb{position:relative;display:block;width:334px;height:179px;overflow:hidden;border-radius:8px;isolation:isolate}
.thumb-image{display:block;width:100%;height:100%;object-fit:cover;transition:filter .45s ease,transform .6s cubic-bezier(.2,.75,.2,1)}
.thumb-label{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;color:rgba(255,255,255,.8);font-size:16px;font-weight:300;background:rgba(5,5,5,.1);opacity:0;transform:translateY(6px);transition:opacity .36s ease,transform .48s cubic-bezier(.18,.7,.18,1)}
.thumb-direction,.thumb-project-name{font-size:inherit;font-weight:inherit;line-height:1.2;color:inherit}
.thumb-project-name{font-family:"SF Pro Display","SF Pro Text",-apple-system,BlinkMacSystemFont,sans-serif;font-size:13px;font-weight:700}
.project-switch:hover .thumb-image,.project-switch:focus-visible .thumb-image{filter:blur(10px);transform:scale(1.04)}
.project-switch:hover .thumb-label,.project-switch:focus-visible .thumb-label{opacity:1;transform:translateY(0)}
.project-switch:hover .round-arrow,.project-switch:focus-visible .round-arrow{color:#050505;border-color:#050505}
.project-footer{position:absolute;left:48px;right:48px;bottom:32px;display:flex;justify-content:space-between;color:#a3a3a3;font-size:10px;letter-spacing:.08em}
.project-footer a{transition:color .2s ease}
.project-footer a:hover,.project-footer a:focus-visible{color:var(--orange)}
.page-exit{position:fixed;inset:0;z-index:200;pointer-events:none;opacity:0;background:rgba(255,255,255,.95);backdrop-filter:blur(14px);transition:opacity .35s var(--ease)}
body.is-leaving .page-exit{opacity:1}
body.is-leaving{cursor:progress}

@media(max-width:700px){
  :root{--header-height:48px}
  .site-header{padding:0 20px}
  .back-link,.project-name{font-size:12px}
  .language-control{gap:7px;font-size:11px}
  main{padding-top:48px}
  .chapter-nav{left:0;right:0;top:auto;bottom:0;transform:none;width:100%;display:flex;overflow-x:auto;gap:18px;padding:14px 18px max(14px,env(safe-area-inset-bottom));background:rgba(255,255,255,.9);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);scrollbar-width:none}
  .chapter-nav a{gap:6px;font-size:11px;line-height:16px;flex-shrink:0;padding:5px 0}
  .chapter-dot{width:6px;height:6px}
  .panel{scroll-margin-top:0}
}
@media(hover:none){.thumb-label{opacity:1;transform:none;background:rgba(5,5,5,.2)}}
@media(max-width:700px){.prototype{margin-bottom:72px}.project-footer{font-size:16px}.chapter-nav{overscroll-behavior-x:contain}.project-switch .thumb-label{font-size:22px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.page-exit{display:none}}
/* 统一最终方案大标题使用 PingFang SC Medium */
#concept h2,
#concept h2 span,
#interface h2,
#interface h2 span,
#interface-detail h2,
#interface-detail h2 span,
#remote h2,
#remote h2 span {
  font-family: "PingFang SC", sans-serif !important;
  font-weight: 400 !important;
  font-synthesis: none;
}
/* 统一「设计需求」页大标题的字体观感 */
#requirements h2,
#requirements h2 span {
  font-family: "PingFang SC", sans-serif !important;
  font-weight: 600 !important;
  color: #4d4d4d !important;
  font-synthesis: none;
}

/* 「设计宗旨」保留加粗层级，但使用统一的字体渲染。 */
#requirements [data-node-id="3651:1942"] > span:first-child {
  font-family: "PingFang SC", sans-serif !important;
  font-weight: 600 !important;
  font-synthesis: none;
  -webkit-font-smoothing: auto;
}

/* 遥控器设计页的最终方案标题 */
#remote [data-node-id="3672:3385"],
#remote [data-node-id="3672:3385"] span {
  color: #4d4d4d !important;
}

/* 两个主要用户画像：仅黑色圆形呼吸，文字和白色遮罩保持固定。 */
#users .user-persona {
  width: 136px;
  height: 136px;
  border-radius: 50%;
  background: #fff;
  isolation: isolate;
  pointer-events: none;
}
#users .user-persona-disc {
  position: absolute;
  inset: .5px;
  border-radius: 50%;
  background: #000;
  transform-origin: center center;
  animation: user-persona-breathe 2.2s ease-in-out infinite;
}
#users .user-persona-label {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: "Open Sans", "Source Han Sans CN", sans-serif;
  font-size: 12px;
  font-weight: 700;
  line-height: 18px;
  white-space: nowrap;
}
#users .user-persona-number {
  font-size: 18px;
  line-height: 26px;
}
@keyframes user-persona-breathe {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(.92); }
}
@media (prefers-reduced-motion: reduce) {
  #users .user-persona-disc { animation: none; }
}
#overview [data-node-id="3618:21004"] {
  left: 300 !important;
  transform: none;
}
#users [data-node-id="3650:1702"] {
  border-radius: 8px;
  border: 1px solid #4d4d4d;
  box-sizing: border-box;
  clip-path: inset(0 round 8px);
}
/* 遥控器物理原型页底部分隔线：替代原灰色图片。 */
.prototype-divider {
  background: #d2d2d2;
}
/* 最终方案简介与遥控器物理原型之间的留白 */
#prototype {
  margin-top: calc(200px * var(--scale));
}

/* 研究方法与目标用户群体的主标题：使用同一系统字形与半粗字重，避免单个汉字出现粗细差异。 */
#research [data-node-id="3640:2469"],
#research [data-node-id="3640:2469"] span,
#users [data-node-id="3651:2043"],
#users [data-node-id="3651:2043"] span{
  font-family:"PingFang SC","Source Han Sans CN",sans-serif!important;
  font-weight:600!important;
  font-synthesis:none;
  -webkit-font-smoothing:antialiased;
}

/* Shared author identity in the project-detail navigation. */
.profile-link{justify-self:end;display:inline-flex;align-items:center;gap:0;font-size:calc(12px * var(--scale));letter-spacing:.08em;line-height:1;white-space:nowrap;transition:transform .25s ease}
.profile-link::after{content:"→";width:0;margin-left:0;overflow:hidden;opacity:0;transform:translateX(-5px);transition:width .25s ease,margin-left .25s ease,opacity .2s ease,transform .25s ease}
.profile-link:hover,.profile-link:focus-visible{transform:translateX(-4px)}
.profile-link:hover::after,.profile-link:focus-visible::after{width:.9em;margin-left:.42em;opacity:1;transform:translateX(0)}
.profile-link:focus-visible{outline:1px solid currentColor;outline-offset:5px}
.site-header .project-name,.site-header .profile-link{font-family:"SF Pro Text","SF Pro Display",-apple-system,BlinkMacSystemFont,sans-serif;font-weight:400}