/* RONGTAO / photographic edition — 2026.09 */
:root{--paper:#101010;--ink:#eeede9;--muted:#a5a39e;--line:#343432;--accent:#d5c6af;color-scheme:dark}
body.rtd-site-body{background:#101010;color:var(--ink);font-family:"Avenir Next","Helvetica Neue","PingFang SC","Microsoft YaHei",sans-serif;font-size:15px}
.rtd-site-body ::selection{background:#d5c6af;color:#101010}
.rtd-shell{max-width:1680px;padding:0 clamp(22px,4.4vw,76px)}
.rtd-header{min-height:108px;gap:28px;border-color:#30302e}
.rtd-brand{width:138px}.rtd-brand img{filter:brightness(0) invert(1);opacity:.94}
.rtd-desktop-nav a{font-size:11px;letter-spacing:.12em;text-transform:uppercase}.rtd-desktop-nav{gap:32px}
.rtd-lang a{color:#a5a39e}.rtd-lang span{color:#656561}
.rtd-site-body h1,.rtd-site-body h2{font-family:"Baskerville","Iowan Old Style","Times New Roman","Songti SC",serif;font-weight:400;letter-spacing:-.015em}
.rtd-site-body h1{font-size:clamp(34px,3.55vw,53px);line-height:1.15}
.rtd-site-body h2{font-size:clamp(27px,2.5vw,37px);line-height:1.2}
.rtd-site-body h3{font-family:inherit;font-weight:400;letter-spacing:.005em}
.rtd-site-body p{font-size:14px;line-height:1.9}.rtd-site-body .rtd-lead{font-size:14px;line-height:1.9;max-width:440px}
.rtd-intro{padding:58px 0 46px}.rtd-intro-grid{grid-template-columns:1.15fr 1fr;gap:13%;align-items:end}
.rtd-site-body .rtd-kicker{font-size:10px;letter-spacing:.16em;color:#a6a49f}
.rtd-section{padding:64px 0}.rtd-section-head{margin-bottom:30px}.rtd-section-head .rtd-kicker{margin-bottom:12px}
.rtd-project-grid,.rtd-gallery{grid-template-columns:repeat(2,minmax(0,1fr));gap:40px 28px;align-items:stretch}
.rtd-selected-grid .rtd-card:nth-child(even){margin-top:0}
.rtd-card{display:flex;flex-direction:column;margin:0!important}
.rtd-card-image,.rtd-gallery-item>a{position:relative;aspect-ratio:16/9;overflow:hidden;background:#191918;isolation:isolate}
.rtd-site-body .rtd-card-image img,.rtd-site-body .rtd-gallery-item>a img{width:100%;height:100%;aspect-ratio:16/9;object-fit:cover;object-position:center}
.rtd-card-image img{transition:filter .4s ease}.rtd-card-image:hover img{filter:brightness(1.06)}
.rtd-card-caption{padding:16px 0 0;gap:20px;min-height:86px;align-items:flex-start}
.rtd-card-caption h3{font-size:16px;line-height:1.55;letter-spacing:.008em}.rtd-card-caption .rtd-kicker{font-size:9px;line-height:1.5;margin-bottom:7px;letter-spacing:.12em}
.rtd-card-arrow{font-size:21px;min-width:32px;line-height:1.4;color:#c8c5bd}
.rtd-category-nav{gap:10px 32px;padding:18px 0}.rtd-category-nav a{font-size:11px;letter-spacing:.045em;min-height:36px}
.rtd-category-nav sup{font-size:9px}.rtd-gallery-wide{grid-column:auto}
.rtd-gallery-item{display:flex;flex-direction:column}.rtd-gallery-item figcaption{padding:5px 0 0;font-size:9px;letter-spacing:.12em}
.rtd-gallery-item figcaption a{font-size:10px;min-height:38px;letter-spacing:.04em}
.rtd-project-facts{margin-bottom:30px;padding:22px 0}.rtd-project-facts dd{font-size:12px}.rtd-project-top+.rtd-intro h1{font-size:clamp(29px,3vw,44px)}
.rtd-gallery{padding-bottom:48px}.rtd-next>a:last-child{font-size:16px}
.rtd-main.rtd-home{display:flex;flex-direction:column}.rtd-home .rtd-home-hero{order:-1;margin-top:28px}
.rtd-home-hero>a{position:relative;overflow:hidden;background:#191918}
.rtd-home-hero figcaption{padding:15px 0;font-size:10px}.rtd-home-hero figcaption>span:first-child{font-size:9px}
.rtd-home>.rtd-intro{padding:46px 0 54px;border-bottom:1px solid var(--line)}
.rtd-home .rtd-home-hero img{width:100%;height:auto;aspect-ratio:auto}
.rtd-services-preview>a{border-color:var(--line)}.rtd-services-preview h3{font-size:17px}.rtd-service-list h2{font-size:27px}
.rtd-team{gap:28px;align-items:stretch}.rtd-team article{display:flex;flex-direction:column}
.rtd-site-body .rtd-team article>img{aspect-ratio:4/5;width:100%;height:auto;object-fit:contain;object-position:center top;background:#171716}
.rtd-team h3{font-size:16px}.rtd-founder figure{max-width:350px}.rtd-founder img{height:auto;object-fit:contain}
.rtd-contact-layout{gap:68px}.rtd-contact-data h2{font-size:23px}.rtd-contact-email{font-size:23px}.rtd-contact-phone{font-size:18px}.rtd-offices h3{font-size:18px}
.rtd-contact-image img,.rtd-service-image img{height:auto;object-fit:contain}
.rtd-qr img{filter:none!important;background:#fff;color-scheme:light}
.rtd-footer{padding-top:60px}.rtd-footer h2{font-size:clamp(28px,2.8vw,39px)}.rtd-footer-top{padding-bottom:45px}
.rtd-link{border-color:#686862;font-size:11px;letter-spacing:.025em}.rtd-footer-bottom{font-size:10px;color:#a5a39e}
.rtd-photo-frame{position:relative;display:block;isolation:isolate}
.rtd-photo-frame:not([data-photo-ready="true"])::after{content:"RTD";position:absolute;bottom:7%;left:50%;transform:translateX(-50%);font-family:Georgia,serif;font-size:clamp(11px,1.2vw,20px);letter-spacing:.22em;color:#fff;opacity:.32;pointer-events:none;text-shadow:0 1px 3px #000}
.rtd-photo-frame[data-photo-ready="true"]::after{display:none}
.rtd-lightbox{background:#101010;color:#eeede9;max-width:98vw;width:min(1600px,98vw);height:96dvh;max-height:96dvh;padding:18px 26px}
.rtd-lightbox::backdrop{background:#000e}.rtd-lightbox button,.rtd-lightbox a{color:#dddcd6;font-family:inherit;font-size:11px;min-height:44px}
.rtd-lightbox-stage{position:relative;height:calc(100% - 88px)}
.rtd-lightbox-stage img{transition:opacity .2s}.rtd-lightbox[data-loading="true"] .rtd-lightbox-stage img{opacity:.15}
.rtd-lightbox[data-loading="true"] .rtd-lightbox-stage:after{content:attr(data-loading-label);position:absolute;color:#bebbb3;font-size:11px;letter-spacing:.12em}
.rtd-lightbox-bar,.rtd-lightbox-controls{height:44px}.rtd-lightbox-controls{justify-content:space-between}.rtd-download{display:flex;align-items:center;text-decoration:underline!important;text-underline-offset:5px}
.rtd-lightbox button:focus-visible,.rtd-lightbox a:focus-visible{outline:1px solid var(--accent);outline-offset:3px}
.rtd-photo-status{font-size:10px!important;letter-spacing:.02em;min-height:18px;color:#bab6ad!important;margin-top:12px!important}
html[lang="zh-CN"] .rtd-site-body h1,html[lang="zh-CN"] .rtd-site-body h2{font-family:"Songti SC","Noto Serif CJK SC","STSong",serif;letter-spacing:.035em}
html[lang="zh-CN"] .rtd-intro h1{font-size:clamp(29px,3vw,43px);line-height:1.4}
@media(max-width:1099px){.rtd-brand{width:126px}.rtd-header{min-height:92px}.rtd-intro-grid{gap:8%}.rtd-contact-layout{gap:38px}.rtd-team{gap:26px}.rtd-project-grid,.rtd-gallery{gap:32px 22px}}
@media(max-width:767px){.rtd-shell{padding:0 20px}.rtd-header{min-height:82px;gap:12px}.rtd-brand{width:116px}.rtd-lang{gap:7px}.rtd-lang a{font-size:10px}.rtd-intro{padding:34px 0 28px}.rtd-intro-grid{grid-template-columns:1fr;gap:20px}.rtd-site-body h1{font-size:35px}.rtd-site-body h2{font-size:28px}.rtd-site-body p,.rtd-site-body .rtd-lead{font-size:13px;line-height:1.85}.rtd-project-grid,.rtd-gallery{grid-template-columns:1fr;gap:27px}.rtd-card-caption{min-height:0;padding-top:13px}.rtd-card-caption h3{font-size:15px}.rtd-card-caption .rtd-kicker{font-size:9px;margin-bottom:6px}.rtd-section{padding:42px 0}.rtd-category-nav{gap:6px 19px;padding:14px 0}.rtd-category-nav a{font-size:11px}.rtd-home .rtd-home-hero{margin-top:20px}.rtd-home>.rtd-intro{padding:30px 0 36px}.rtd-home-hero figcaption{gap:7px 14px}.rtd-home-hero figcaption .rtd-link{font-size:9px}.rtd-project-top+.rtd-intro h1{font-size:29px}.rtd-project-facts{margin-bottom:24px;gap:20px}.rtd-team{gap:28px 18px}.rtd-team h3{font-size:15px}.rtd-contact-layout{gap:28px}.rtd-contact-email{font-size:22px}.rtd-contact-phone{font-size:18px}.rtd-footer{padding-top:42px}.rtd-footer h2{font-size:30px}.rtd-footer-top{padding-bottom:32px}.rtd-lightbox{padding:10px;width:98vw}.rtd-lightbox-controls{gap:10px}.rtd-lightbox button,.rtd-lightbox a{font-size:10px}html[lang="zh-CN"] .rtd-intro h1{font-size:28px}}
@media(prefers-reduced-motion:reduce){.rtd-card-image img,.rtd-lightbox-stage img{transition:none}}