:root{--paper:#fafbf9;--ink:#152b3a;--blue:#126b94;--muted:#6f818b;--gold:#b78d4e;--line:#dce3e2;--gutter:clamp(24px,6.25vw,120px)}
*{box-sizing:border-box}html{scroll-behavior:auto}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;-webkit-font-smoothing:antialiased}button{font:inherit;color:inherit;border:0;background:none;cursor:pointer;border-radius:0}button:focus-visible,a:focus-visible{outline:2px solid var(--blue);outline-offset:6px}button:disabled{cursor:default;opacity:.45}p,h1{margin:0}img{display:block;max-width:100%}[hidden]{display:none!important}.skip-link{position:fixed;left:20px;top:-80px;padding:12px 18px;background:var(--ink);color:white;z-index:20}.skip-link:focus{top:12px}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.preview-header{position:fixed;inset:0 0 auto;height:78px;padding:0 var(--gutter);display:grid;grid-template-columns:150px 1fr auto auto;align-items:center;gap:28px;z-index:10;background:#fafbf9f2;backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.brand{width:150px;height:auto}.header-title{font-size:12px;color:var(--muted);letter-spacing:.08em}.preview-header>button{font-size:12px;line-height:1.8;min-height:44px;padding:10px 0;white-space:nowrap}.preview-header>button span{margin-left:18px;font-size:18px}.preview-header>button:hover{color:var(--blue)}
.scroll-story{position:relative;height:1400vh;height:1400svh}.preview-stage{background:var(--paper);position:sticky;top:0;height:100vh;height:100svh;min-height:560px;overflow:hidden;isolation:isolate}.phase-copy{position:absolute;top:29%;left:var(--gutter);width:clamp(220px,24vw,370px);z-index:2;pointer-events:none}.eyebrow{font:10px/1.7 Arial,"Microsoft YaHei",sans-serif;letter-spacing:.15em;color:#758d99;margin-bottom:25px}.phase-copy h1{font-weight:400;font-size:clamp(29px,2.7vw,49px);line-height:1.4;letter-spacing:-.04em;text-wrap:balance}.phase-description{font-size:13px;line-height:2;color:var(--muted);margin-top:24px;max-width:28ch;text-wrap:balance}.media-surface{position:absolute;left:27%;right:2%;top:108px;bottom:172px;mix-blend-mode:multiply}.media-surface canvas,.frame-poster{position:absolute;inset:0;display:block;width:100%;height:100%;border:0;border-radius:0;box-shadow:none;object-fit:contain}.media-surface canvas{z-index:1;opacity:0}.preview-stage.has-frame canvas{opacity:1}.frame-poster{z-index:0}.loading-note{position:absolute;inset:auto 0 30px;text-align:center;z-index:3;font-size:12px;color:var(--muted);line-height:1.8;pointer-events:none}.loading-note button{font-size:12px;margin-top:9px;padding:8px;pointer-events:auto}.preview-stage.has-frame .loading-note:has(#retryButton[hidden]){display:none}
.stage-footer{position:absolute;left:var(--gutter);right:var(--gutter);bottom:27px;z-index:4}.footer-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;gap:20px}.scroll-hint{display:flex;align-items:center;gap:14px;font-size:11px;line-height:1.8;color:#5e7887}.scroll-line{display:block;width:1px;height:26px;background:#8da4ae}.scroll-hint>span:last-child{font-size:16px}.motion-hint{font-size:11px;line-height:1.8;color:#82939a}.progress-track{height:1px;background:var(--line);overflow:hidden}.progress-track i{display:block;height:100%;width:100%;background:var(--gold);transform:scaleX(0);transform-origin:left}.phase-navigation{display:grid;grid-template-columns:repeat(var(--phase-count,6),minmax(0,1fr));gap:clamp(12px,2vw,34px);padding-top:10px}.phase-navigation button{text-align:left;padding:12px 0;min-height:53px;color:#8a9aa2;font-size:12px;line-height:1.6;transition:color .15s}.phase-navigation button>span{display:block;font:9px/1.5 Arial,sans-serif;letter-spacing:.09em;margin-bottom:5px;color:#9fadb3}.phase-navigation button[aria-current="step"]{color:var(--ink)}.phase-navigation button[aria-current="step"]>span{color:var(--gold)}.phase-navigation button:hover{color:var(--blue)}.no-script{position:fixed;bottom:20px;left:24px;right:24px;z-index:15;background:var(--paper);padding:20px;color:var(--muted);font-size:14px}
@media(min-width:1900px){.preview-header{height:92px;grid-template-columns:180px 1fr auto auto}.brand{width:180px}.header-title,.preview-header>button{font-size:15px}.phase-copy{top:30%}.eyebrow{font-size:13px}.phase-description{font-size:17px}.media-surface{top:128px;bottom:210px}.stage-footer{bottom:36px}.phase-navigation button{font-size:16px}.phase-navigation button>span{font-size:12px}.scroll-hint,.motion-hint{font-size:14px}.footer-top{margin-bottom:27px}}
@media(max-width:1050px){.preview-header{gap:22px}.phase-copy{top:25%;width:29%;left:var(--gutter)}.phase-copy h1{font-size:30px}.phase-description{font-size:12px}.media-surface{left:30%;right:0;top:115px;bottom:180px}.phase-navigation{gap:16px}.phase-navigation button{font-size:11px}.motion-hint{font-size:10px}}
@media(max-width:700px){.preview-header{height:72px;grid-template-columns:112px 1fr auto auto;gap:12px}.brand{width:112px}.header-title{font-size:10px;letter-spacing:0;white-space:nowrap}.preview-header>button{font-size:11px}.preview-header>button span{display:none}.preview-stage{min-height:620px}.phase-copy{left:24px;right:24px;top:111px;width:auto;max-width:none}.eyebrow{font-size:9px;margin-bottom:14px}.phase-copy h1{font-size:29px;line-height:1.35}.phase-description{font-size:12px;margin-top:13px;max-width:none}.media-surface{left:-5%;right:-5%;top:242px;bottom:182px}.stage-footer{left:24px;right:24px;bottom:18px}.footer-top{margin-bottom:13px}.scroll-hint{font-size:10px;gap:11px}.scroll-line{height:22px}.motion-hint{font-size:9px}.phase-navigation{grid-template-columns:repeat(var(--mobile-phase-count,3),minmax(0,1fr));gap:0 16px;padding-top:7px}.phase-navigation button{min-height:47px;padding:7px 0;font-size:11px}.phase-navigation button>span{font-size:8px;margin-bottom:3px}.loading-note{bottom:10px;font-size:11px}}
@media(max-width:700px) and (max-height:720px){.preview-stage{min-height:0}.phase-copy{top:96px}.phase-copy h1{font-size:25px}.phase-description{font-size:11px;margin-top:9px}.eyebrow{margin-bottom:10px}.media-surface{top:202px;bottom:158px}.stage-footer{bottom:11px}.footer-top{margin-bottom:8px}.phase-navigation button{min-height:44px;padding:5px 0}.motion-hint{display:none}}
@media(min-width:701px) and (max-height:650px){.preview-stage{min-height:0}.phase-copy{top:25%;width:24%}.phase-copy h1{font-size:28px}.phase-description{font-size:12px;margin-top:15px}.eyebrow{margin-bottom:15px}.media-surface{top:96px;bottom:142px}.stage-footer{bottom:16px}.footer-top{margin-bottom:10px}.phase-navigation button{min-height:45px;padding:8px 0}}
@media(prefers-reduced-motion:reduce){.phase-navigation button{transition:none}}
@media(min-width:701px) and (max-aspect-ratio:1/1){
  .phase-copy{top:132px;left:var(--gutter);right:var(--gutter);width:auto;max-width:none}
  .phase-copy h1{font-size:34px}
  .eyebrow{margin-bottom:15px}
  .phase-description{margin-top:14px;max-width:60ch;font-size:13px}
  .media-surface{left:3%;right:3%;top:200px;bottom:172px}
}

.download-film{display:inline-flex;align-items:center;gap:13px;min-height:44px;color:var(--muted);font-size:11px;text-decoration:none;white-space:nowrap}.download-film:hover{color:var(--blue)}.download-film span{font-size:16px}
@media(min-width:1900px){.download-film{font-size:14px}}
@media(max-width:700px){.header-title{display:none}.preview-header{grid-template-columns:112px 1fr auto;gap:12px}.download-film{justify-self:end;font-size:10px;gap:5px}.download-film span{font-size:13px}.preview-header>button{justify-self:end}}
@media(max-width:370px){.download-film{font-size:9px}.preview-header{gap:8px}.preview-header>button{font-size:10px}}

html,body{overscroll-behavior-y:none}.preview-stage{touch-action:pinch-zoom}

.scroll-story{overflow-anchor:none}

.terrain-navigation{display:flex;flex-wrap:wrap;gap:8px 17px;margin-top:20px;max-width:32ch;pointer-events:auto}.terrain-navigation button{font-size:11px;padding:7px 0;line-height:1.5;color:var(--muted);border-bottom:1px solid transparent}.terrain-navigation button[aria-current="true"]{color:var(--ink);border-bottom-color:var(--gold)}.terrain-navigation button:hover{color:var(--blue)}
.idle-loop{position:absolute;inset:0;display:block;width:100%;height:100%;object-fit:contain;border:0;border-radius:0;box-shadow:none;background:#fff;z-index:2;opacity:0;pointer-events:none}.idle-loop.is-visible{opacity:1}.idle-loop.is-leaving{transition:opacity 80ms linear;opacity:0}
@media(max-width:700px){.terrain-navigation{margin-top:13px;gap:4px 13px;max-width:none}.terrain-navigation button{font-size:10px;padding:5px 0}.preview-stage.has-terrain .media-surface{top:280px}}

.preview-header a.brand{display:block}.header-title{text-decoration:none}.header-title:hover{color:var(--blue)}

.media-surface .idle-snapshot{z-index:3;opacity:0}.media-surface .idle-snapshot.is-visible{opacity:1}.media-surface .idle-snapshot.is-leaving{opacity:0}