:root {
  --ink: #141612;
  --paper: #f2efe7;
  --paper-2: #e4dfd3;
  --cream: #fffaf0;
  --orange: #ef6339;
  --green: #1c5945;
  --yellow: #f0c94b;
  --blue: #315e6e;
  --line: rgba(20, 22, 18, .22);
  --shell: 1280px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--ink); }
body { margin: 0; overflow-x: hidden; background: var(--paper); color: var(--ink); font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif; font-size: 1rem; letter-spacing: 0; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; color: inherit; }
.skip-link { position: fixed; z-index: 100; top: -5rem; left: 1rem; padding: .8rem 1rem; background: var(--yellow); color: var(--ink); }
.skip-link:focus { top: 1rem; }

.site-header { position: fixed; z-index: 40; top: 0; left: 0; right: 0; display: grid; grid-template-columns: 1fr auto; align-items: center; min-height: 4.5rem; padding: .75rem 1rem; border-bottom: 1px solid rgba(255,255,255,.22); background: rgba(20,22,18,.82); color: #fff; backdrop-filter: blur(16px); }
.brand { width: 6.7rem; }
.brand img { width: 100%; height: auto; }
.desktop-nav, .header-download { display: none; }
.menu-button { display: grid; place-items: center; width: 3rem; height: 3rem; border: 1px solid rgba(255,255,255,.5); background: transparent; cursor: pointer; }
.menu-button svg { width: 1.2rem; }
.mobile-nav { position: absolute; top: 100%; left: 0; right: 0; display: grid; max-height: 0; overflow: hidden; background: var(--ink); transition: max-height .25s ease; }
.mobile-nav.is-open { max-height: 22rem; border-bottom: 1px solid rgba(255,255,255,.35); }
.mobile-nav a { display: flex; align-items: center; min-height: 3.3rem; padding: .75rem 1rem; border-top: 1px solid rgba(255,255,255,.14); font-size: .86rem; font-weight: 700; }

.hero { position: relative; min-height: 46rem; overflow: hidden; background: #0d100d; color: #fff; }
.hero-image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 58% center; }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(9,12,9,.94) 0%, rgba(9,12,9,.76) 46%, rgba(9,12,9,.2) 100%), linear-gradient(0deg, rgba(9,12,9,.82) 0%, transparent 42%); }
.hero-grain { position: absolute; inset: 0; opacity: .2; pointer-events: none; background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.92' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.34'/%3E%3C/svg%3E"); mix-blend-mode: soft-light; }
.hero-content { position: relative; z-index: 2; width: min(100%, var(--shell)); margin: 0 auto; padding: 8rem 1rem 6rem; }
.eyebrow { margin: 0 0 1rem; color: #d7ded2; font-size: .68rem; font-weight: 800; letter-spacing: .14em; }
.eyebrow span { display: inline-grid; place-items: center; width: 2rem; height: 2rem; margin-right: .6rem; border: 1px solid currentColor; color: var(--yellow); letter-spacing: 0; }
.eyebrow.dark { color: var(--green); }
.hero-logo { width: 8rem; margin: 0 0 1.4rem; }
.hero h1 { margin: 0; max-width: 8ch; font-family: "STSong", "Songti SC", "SimSun", serif; font-size: 4rem; line-height: .92; font-weight: 400; letter-spacing: 0; }
.hero h1 span, .hero h1 strong { display: block; }
.hero h1 strong { margin-top: .2em; color: var(--yellow); font-family: "STKaiti", "Kaiti SC", "KaiTi", serif; font-size: .76em; font-style: normal; font-weight: 400; letter-spacing: .03em; }
.hero-copy { max-width: 33rem; margin: 1.5rem 0 0; color: rgba(255,255,255,.78); font-size: 1rem; line-height: 1.8; }
.hero-actions { display: flex; flex-direction: column; align-items: flex-start; gap: .85rem; margin-top: 1.8rem; }
.download-button { position: relative; isolation: isolate; display: inline-flex; align-items: center; gap: .8rem; min-height: 4rem; padding: .65rem 1.2rem .65rem .8rem; border: 1px solid var(--orange); border-radius: .35rem 2.2rem 2.2rem .35rem; background: var(--orange); color: #17140f; font-size: .8rem; font-weight: 900; box-shadow: .35rem .35rem 0 rgba(244,199,61,.3); transition: transform .2s, background .2s, box-shadow .2s; overflow: hidden; }
.download-button::before, .download-button::after { content: ""; position: absolute; z-index: 0; left: 4.2rem; right: 1.65rem; height: .34rem; pointer-events: none; background: radial-gradient(circle, rgba(23,20,15,.7) 0 .12rem, transparent .14rem) 0 50% / .9rem .34rem repeat-x; }
.download-button::before { top: .14rem; }
.download-button::after { bottom: .14rem; }
.download-button:hover { transform: translateY(-2px); background: var(--yellow); }
.download-button:hover { box-shadow: .5rem .5rem 0 rgba(244,199,61,.36); }
.download-button > span:nth-child(2) { display: grid; gap: .18rem; }
.download-button small { font-size: .52rem; font-weight: 700; letter-spacing: .12em; }
.download-button > svg, .download-button > span { position: relative; z-index: 1; }
.download-button > svg { width: 1rem; }
.shutter { display: grid; place-items: center; width: 2.6rem; height: 2.6rem; flex: 0 0 auto; border: 1px solid currentColor; border-radius: 50%; }
.shutter i { width: .9rem; height: .9rem; border: 2px solid currentColor; border-radius: 50%; box-shadow: inset 0 0 0 2px rgba(255,255,255,.35); }
.quiet-link { display: inline-flex; align-items: center; gap: .55rem; min-height: 3.1rem; padding: .6rem 0; border-bottom: 1px solid rgba(255,255,255,.5); font-size: .78rem; font-weight: 800; }
.quiet-link svg { width: 1.1rem; color: var(--yellow); }
.hero-specs { display: flex; flex-wrap: wrap; gap: 1.3rem; margin: 2.4rem 0 0; }
.hero-specs div { min-width: 5.5rem; padding-top: .7rem; border-top: 1px solid rgba(255,255,255,.35); }
.hero-specs dt { font-size: .76rem; font-weight: 900; }
.hero-specs dd { margin: .3rem 0 0; color: rgba(255,255,255,.56); font-size: .62rem; }
.hero-contact { display: none; }
.scroll-note { position: absolute; z-index: 2; bottom: 1.2rem; left: 1rem; display: flex; align-items: center; gap: .65rem; color: rgba(255,255,255,.55); font-size: .54rem; font-weight: 800; letter-spacing: .12em; }
.scroll-note span { width: 2.5rem; height: 1px; background: var(--yellow); }

.keyword-strip { display: flex; align-items: center; gap: 1rem; overflow: hidden; padding: .85rem 1rem; border-bottom: 1px solid var(--ink); background: var(--yellow); white-space: nowrap; font-size: .68rem; font-weight: 900; }
.keyword-strip i { width: .45rem; height: .45rem; flex: 0 0 auto; border-radius: 50%; background: var(--orange); }

.section { max-width: var(--shell); margin: 0 auto; padding: 5rem 1rem; }
.section-index { display: flex; align-items: center; gap: .65rem; margin-bottom: 2rem; color: var(--green); font-size: .6rem; font-weight: 900; letter-spacing: .12em; }
.section-index span { display: grid; place-items: center; width: 2rem; height: 2rem; border: 1px solid currentColor; letter-spacing: 0; }
.section-index.light { color: var(--yellow); }
.intro { display: grid; gap: 1.5rem; }
.intro h2, .features h2, .lab-head h2, .gallery h2, .install h2, .faq h2 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: 3.3rem; line-height: .94; font-weight: 400; letter-spacing: 0; }
.intro h2 em, .features h2 em, .lab-head h2 em, .gallery h2 em, .install h2 em, .faq h2 em { color: var(--orange); font-weight: 400; }
.intro-copy { max-width: 36rem; }
.intro-copy p { margin: 0 0 1rem; color: #4a4d45; line-height: 1.85; }
.intro-copy .lead { color: var(--ink); font-size: 1.1rem; line-height: 1.7; font-weight: 700; }

.camera-lab { padding: 5rem 1rem; background: var(--ink); color: #fff; }
.lab-head, .lab-workspace { width: min(100%, var(--shell)); margin: 0 auto; }
.lab-head { display: grid; gap: 1.4rem; }
.lab-head > p { max-width: 31rem; margin: 0; color: #abb2a4; line-height: 1.8; }
.lab-head h2 em, .gallery h2 em, .faq h2 em { color: var(--yellow); }
.lab-workspace { display: grid; gap: 1rem; margin-top: 2.5rem; }
.camera-tabs { display: grid; border-top: 1px solid rgba(255,255,255,.25); }
.camera-tabs button { display: grid; grid-template-columns: 2rem 1fr auto; align-items: center; min-height: 4rem; padding: .65rem 0; border: 0; border-bottom: 1px solid rgba(255,255,255,.25); background: transparent; color: #9da59a; text-align: left; cursor: pointer; }
.camera-tabs button span { color: var(--orange); font-size: .63rem; }
.camera-tabs button b { font-size: .9rem; }
.camera-tabs button small { font-size: .56rem; letter-spacing: .1em; }
.camera-tabs button.is-active { color: #fff; }
.camera-tabs button.is-active b { color: var(--yellow); }
.lab-preview { position: relative; min-height: 32rem; overflow: hidden; border: 1px solid rgba(255,255,255,.25); background: #080a08; }
.lab-preview > img { width: 100%; height: 32rem; object-fit: contain; }
.preview-rail { position: absolute; z-index: 2; top: 0; left: 0; right: 0; display: flex; justify-content: space-between; padding: .55rem .7rem; background: rgba(0,0,0,.72); color: #d9dfd5; font-size: .52rem; letter-spacing: .08em; }
.preview-caption { position: absolute; z-index: 2; left: 0; right: 0; bottom: 0; padding: 3rem 1rem 1rem; background: linear-gradient(0deg, rgba(0,0,0,.96), transparent); }
.preview-caption span { color: var(--yellow); font-size: .6rem; font-weight: 900; letter-spacing: .1em; }
.preview-caption p { max-width: 30rem; margin: .55rem 0 0; color: #d4d8d0; font-size: .8rem; line-height: 1.6; }
.lab-dial { padding: 1rem; border: 1px solid rgba(255,255,255,.25); }
.dial { display: flex; align-items: baseline; justify-content: space-between; padding-bottom: .8rem; border-bottom: 1px solid rgba(255,255,255,.25); }
.dial span { color: var(--orange); font-size: .65rem; font-weight: 900; }
.dial strong { font-family: Georgia, serif; font-size: 2.4rem; font-weight: 400; }
.meter { position: relative; display: flex; justify-content: space-between; margin: 1.3rem 0; }
.meter span { width: 1px; height: .8rem; background: #838b80; }
.meter i { position: absolute; top: -.25rem; left: 58%; width: .35rem; height: 1.3rem; background: var(--yellow); }
.lab-dial p { margin: 0; color: #aeb5a9; font-size: .8rem; line-height: 1.7; }
.lab-dial p b { display: block; margin-bottom: .3rem; color: #fff; font-size: .58rem; letter-spacing: .1em; }

.features-head { display: grid; gap: 1.3rem; }
.feature-list { margin-top: 2.5rem; border-top: 1px solid var(--line); }
.feature-list article { position: relative; display: grid; grid-template-columns: 2rem 2.5rem 1fr; gap: 1rem; min-height: 11rem; padding: 1.3rem 0; border-bottom: 1px solid var(--line); }
.feature-list article > span { color: var(--orange); font-size: .65rem; font-weight: 900; }
.feature-list article > svg { width: 1.7rem; color: var(--green); }
.feature-list h3 { margin: 0 0 .55rem; font-family: Georgia, serif; font-size: 1.5rem; font-weight: 400; }
.feature-list p { max-width: 28rem; margin: 0; color: #5f625b; font-size: .84rem; line-height: 1.7; }
.feature-list article > b { position: absolute; right: 0; bottom: .7rem; color: var(--paper-2); font-family: Georgia, serif; font-size: 2.2rem; }

.gallery { display: grid; gap: 2.5rem; padding: 5rem 1rem; background: var(--green); color: #fff; }
.gallery-copy, .contact-sheet { width: min(100%, var(--shell)); margin: 0 auto; }
.gallery-copy > p:not(.eyebrow) { max-width: 29rem; color: #ccd7d0; line-height: 1.75; }
.gallery-controls { display: flex; gap: .5rem; margin-top: 1.4rem; }
.gallery-controls button { display: grid; place-items: center; width: 3rem; height: 3rem; border: 1px solid rgba(255,255,255,.55); background: transparent; cursor: pointer; }
.gallery-controls button:hover { background: var(--yellow); color: var(--ink); }
.gallery-controls svg { width: 1rem; }
.contact-sheet { display: flex; gap: .75rem; overflow-x: auto; padding-bottom: 1rem; scroll-snap-type: x mandatory; scrollbar-color: var(--yellow) transparent; }
.contact-sheet button { position: relative; flex: 0 0 72vw; max-width: 19rem; padding: 2rem .55rem .55rem; border: 1px solid rgba(255,255,255,.38); background: #0d100d; cursor: zoom-in; scroll-snap-align: start; }
.contact-sheet button > span { position: absolute; top: .6rem; left: .65rem; color: var(--yellow); font-size: .52rem; font-weight: 900; letter-spacing: .08em; }
.contact-sheet img { width: 100%; height: 27rem; object-fit: cover; object-position: top; filter: saturate(.94); transition: filter .25s; }
.contact-sheet button:hover img { filter: saturate(1.15); }

.install { display: grid; gap: 2.5rem; }
.install-head > p:not(.eyebrow) { max-width: 30rem; color: #5b5f56; line-height: 1.8; }
.install-steps { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.install-steps li { display: grid; grid-template-columns: 2rem 1fr 2rem; gap: 1rem; padding: 1.35rem 0; border-bottom: 1px solid var(--line); }
.install-steps li > span { color: var(--orange); font-weight: 900; }
.install-steps li b { color: var(--green); font-size: .58rem; letter-spacing: .1em; }
.install-steps h3 { margin: .35rem 0; font-family: Georgia, serif; font-size: 1.3rem; font-weight: 400; }
.install-steps p { margin: 0; color: #65685f; font-size: .8rem; line-height: 1.65; }
.install-steps svg { width: 1.25rem; color: var(--green); }
.download-panel { display: grid; gap: 1.3rem; padding: 1.3rem; background: var(--orange); color: var(--ink); }
.download-panel > img { width: 5rem; height: 5rem; border-radius: .5rem; }
.download-panel small { font-size: .56rem; font-weight: 900; letter-spacing: .1em; }
.download-panel h3 { margin: .55rem 0; font-family: Georgia, serif; font-size: 2rem; line-height: 1; font-weight: 400; }
.download-panel p { margin: 0; font-size: .82rem; line-height: 1.65; }
.download-button.dark { justify-self: start; border-color: var(--ink); background: var(--ink); color: #fff; box-shadow: .35rem .35rem 0 rgba(23,20,15,.16); }
.download-button.dark::before, .download-button.dark::after { background: radial-gradient(circle, rgba(255,255,255,.55) 0 .12rem, transparent .14rem) 0 50% / .9rem .34rem repeat-x; }
.download-button.dark:hover { background: var(--green); }

.faq { display: grid; gap: 2.5rem; padding: 5rem 1rem; background: var(--ink); color: #fff; }
.faq-heading, .faq-list { width: min(100%, var(--shell)); margin: 0 auto; }
.faq-list details { border-top: 1px solid rgba(255,255,255,.24); }
.faq-list details:last-child { border-bottom: 1px solid rgba(255,255,255,.24); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 4.5rem; cursor: pointer; list-style: none; font-size: .95rem; font-weight: 800; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary svg { width: 1.1rem; color: var(--yellow); transition: transform .2s; }
.faq-list details[open] summary svg { transform: rotate(45deg); }
.faq-list p { max-width: 42rem; margin: -.2rem 2rem 1.4rem 0; color: #adb4a8; font-size: .85rem; line-height: 1.75; }

footer { padding: 3rem 1rem 6rem; background: #090a08; color: #fff; }
.footer-brand, .footer-note { max-width: var(--shell); margin: 0 auto; }
.footer-brand { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.footer-brand img { width: 7rem; }
.footer-brand p { display: none; margin: 0; color: #90988d; font-size: .55rem; letter-spacing: .1em; }
.footer-note { display: flex; flex-direction: column; gap: .45rem; margin-top: 2rem; padding-top: 1rem; border-top: 1px solid rgba(255,255,255,.16); color: #777f73; font-size: .62rem; line-height: 1.5; }
.mobile-download { position: fixed; z-index: 35; left: 0; right: 0; bottom: 0; display: flex; align-items: center; justify-content: space-between; padding: .5rem .7rem; border-top: 1px solid #3e443c; background: rgba(20,22,18,.95); color: #fff; backdrop-filter: blur(12px); }
.mobile-download span { display: flex; align-items: center; gap: .55rem; }
.mobile-download img { width: 2.5rem; height: 2.5rem; border-radius: .45rem; }
.mobile-download b { font-size: .76rem; }
.mobile-download a { display: inline-flex; align-items: center; gap: .4rem; min-height: 2.7rem; padding: .7rem 1rem; background: var(--yellow); color: var(--ink); font-size: .75rem; font-weight: 900; }
.mobile-download svg { width: 1rem; }

.lightbox { width: min(92vw, 34rem); max-height: 92vh; padding: 0; border: 1px solid rgba(255,255,255,.4); background: #070807; color: #fff; }
.lightbox::backdrop { background: rgba(0,0,0,.86); backdrop-filter: blur(6px); }
.lightbox button { position: absolute; z-index: 2; top: .6rem; right: .6rem; display: grid; place-items: center; width: 2.8rem; height: 2.8rem; border: 1px solid rgba(255,255,255,.65); background: rgba(0,0,0,.68); cursor: pointer; }
.lightbox button svg { width: 1rem; }
.lightbox img { width: 100%; max-height: 90vh; object-fit: contain; }

@media (min-width: 768px) {
  .site-header { grid-template-columns: auto 1fr auto; gap: 2rem; padding: .75rem 1.5rem; }
  .brand { width: 7.5rem; }
  .desktop-nav { display: flex; justify-content: center; gap: 2rem; font-size: .72rem; font-weight: 700; }
  .desktop-nav a:hover { color: var(--yellow); }
  .header-download { display: inline-flex; align-items: center; gap: .5rem; min-height: 3rem; padding: .65rem 1rem; border: 1px solid rgba(255,255,255,.45); font-size: .72rem; font-weight: 800; }
  .header-download:hover { background: var(--yellow); color: var(--ink); }
  .header-download svg { width: 1rem; }
  .menu-button, .mobile-nav { display: none; }
  .hero { min-height: 50rem; }
  .hero-content { padding: 10rem 1.5rem 7rem; }
  .hero h1 { font-size: 6rem; }
  .hero-actions { flex-direction: row; align-items: center; }
  .hero-specs { gap: 2rem; }
  .hero-contact { position: absolute; z-index: 2; right: 3vw; bottom: 5rem; display: flex; align-items: flex-end; gap: .8rem; }
  .hero-contact figure { width: 9rem; margin: 0; padding: .45rem .45rem 1.8rem; background: var(--cream); color: var(--ink); box-shadow: 0 1rem 3rem rgba(0,0,0,.35); transform: rotate(4deg); }
  .hero-contact figure:first-child { width: 8rem; transform: rotate(-7deg) translateY(-2rem); }
  .hero-contact img { width: 100%; height: 12rem; object-fit: cover; object-position: top; }
  .hero-contact figcaption { margin-top: .45rem; font-family: Georgia, serif; font-size: .65rem; text-align: center; }
  .scroll-note { left: 1.5rem; }
  .section { padding: 7rem 1.5rem; }
  .intro { grid-template-columns: .25fr .8fr 1fr; gap: 3rem; align-items: start; }
  .intro h2, .features h2, .lab-head h2, .gallery h2, .install h2, .faq h2 { font-size: 5rem; }
  .camera-lab { padding: 7rem 1.5rem; }
  .lab-head { grid-template-columns: .25fr .9fr .65fr; gap: 3rem; align-items: end; }
  .lab-head .section-index { align-self: start; }
  .lab-workspace { grid-template-columns: .7fr 1.55fr .75fr; min-height: 37rem; }
  .lab-preview, .lab-preview > img { min-height: 37rem; height: 37rem; }
  .lab-dial { align-self: end; }
  .features-head { grid-template-columns: .3fr 1fr; gap: 4rem; }
  .feature-list { display: grid; grid-template-columns: repeat(2, 1fr); }
  .feature-list article:nth-child(odd) { padding-right: 2rem; border-right: 1px solid var(--line); }
  .feature-list article:nth-child(even) { padding-left: 2rem; }
  .gallery { grid-template-columns: .72fr 1.28fr; gap: 3rem; padding: 7rem 1.5rem; }
  .gallery-copy { max-width: none; }
  .contact-sheet { max-width: none; }
  .contact-sheet button { flex-basis: 17rem; }
  .install { grid-template-columns: .78fr 1.22fr; gap: 5rem; }
  .download-panel { grid-column: 1 / -1; grid-template-columns: auto 1fr auto; align-items: center; padding: 1.5rem; }
  .download-panel > img { width: 7rem; height: 7rem; }
  .faq { grid-template-columns: .8fr 1.2fr; gap: 5rem; padding: 7rem 1.5rem; }
  .faq-heading, .faq-list { max-width: none; }
  .footer-brand p { display: block; }
  .footer-note { flex-direction: row; justify-content: space-between; }
  .mobile-download { display: none; }
}

@media (min-width: 1024px) {
  .site-header { padding-left: max(2rem, calc((100vw - var(--shell)) / 2)); padding-right: max(2rem, calc((100vw - var(--shell)) / 2)); }
  .hero h1 { font-size: 7rem; }
  .hero-contact { right: max(3vw, calc((100vw - var(--shell)) / 2)); }
  .contact-sheet button { flex-basis: 18rem; }
}

@media (max-width: 374px) {
  .hero h1 { font-size: 3.4rem; }
  .download-button { font-size: .72rem; }
  .intro h2, .features h2, .lab-head h2, .gallery h2, .install h2, .faq h2 { font-size: 2.85rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}