/* =========================================================
   薄仓 BO CANG — Brand Site
   ========================================================= */
:root{
  --paper:#faf8f5;
  --paper-2:#f2eee8;
  --white:#fff;
  --ink:#1c1a17;
  --ink-2:#403a33;
  --muted:#8c8378;
  --line:#e4ded4;
  --red:#8e2921;
  --red-2:#a8453a;
  --gold:#c2a675;
  --dark:#171613;
  --serif:"Songti SC","STSong","Noto Serif CJK SC","Source Han Serif SC","SimSun",Georgia,serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --en:"Cormorant Garamond",Georgia,"Times New Roman",serif;
  --ease:cubic-bezier(.22,.68,.24,1);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
h1,h2,h3,p,figure,dl,dd,ol{margin:0}
ol{list-style:none;padding:0}
::selection{background:var(--red);color:#fff}
.wrap{width:100%;max-width:1320px;margin:0 auto;padding:0 56px}
.reveal{opacity:0;transform:translateY(26px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.is-visible{opacity:1;transform:none}
.eyebrow{font-size:11px;letter-spacing:.22em;color:var(--red);font-weight:600;text-transform:uppercase;margin-bottom:30px}
.eyebrow-light{color:rgba(255,255,255,.72)}
.h2{font-family:var(--serif);font-size:clamp(38px,4.2vw,62px);line-height:1.3;font-weight:500;letter-spacing:.01em}
.section{padding:140px 0}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:70px;margin-bottom:72px}
.section-lead{font-size:15px;line-height:2.1;color:var(--ink-2);max-width:390px;padding-bottom:8px}
.fine-print{font-size:11.5px;line-height:1.9;color:var(--muted);letter-spacing:.02em}
sup{font-size:.55em;vertical-align:super;color:var(--red)}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:14px;font-size:13.5px;letter-spacing:.06em;transition:all .4s var(--ease);white-space:nowrap}
.btn span{font-size:16px;transition:transform .4s var(--ease)}
.btn:hover span{transform:translate(4px,-2px)}
.btn-solid{background:var(--red);color:#fff;padding:18px 34px;border:1px solid var(--red)}
.btn-solid:hover{background:#711e18;border-color:#711e18;box-shadow:0 12px 30px rgba(142,41,33,.18)}
.btn-outline{border:1px solid var(--ink);padding:14px 24px}
.btn-outline:hover{background:var(--ink);color:#fff}
.btn-sm{padding:12px 22px;font-size:12.5px}
.btn-text{padding:10px 0;border-bottom:1px solid var(--ink);font-size:13.5px}
.btn-text:hover{color:var(--red);border-color:var(--red)}

/* announce + header */
.announce{background:var(--dark);color:#cfc7bb;height:34px;font-size:10.5px;letter-spacing:.2em}
.announce-in{height:100%;display:flex;align-items:center;justify-content:space-between}
.announce-cn{letter-spacing:.28em;color:#a9a196}
.header{position:sticky;top:0;z-index:100;height:88px;transition:background .45s var(--ease),box-shadow .45s var(--ease),height .45s var(--ease)}
.header.is-scrolled{background:rgba(250,248,245,.93);backdrop-filter:saturate(150%) blur(16px);-webkit-backdrop-filter:saturate(150%) blur(16px);box-shadow:0 1px 0 var(--line);height:74px}
.header-in{height:100%;display:flex;align-items:center;justify-content:space-between;gap:40px}
.brandmark{display:flex;align-items:center;flex:0 0 auto}
.brandmark img{width:92px;height:auto;transition:width .45s var(--ease)}
.header.is-scrolled .brandmark img{width:82px}
.nav{display:flex;align-items:center;gap:36px}
.nav a{position:relative;font-size:13.5px;color:var(--ink-2);letter-spacing:.06em;padding:8px 0}
.nav a::after{content:"";position:absolute;left:0;bottom:2px;width:0;height:1px;background:var(--red);transition:width .4s var(--ease)}
.nav a:hover{color:var(--red)}
.nav a:hover::after{width:100%}
.header-actions{display:flex;align-items:center;gap:16px}
.menu-toggle{display:none;width:42px;height:42px;position:relative;border:1px solid var(--line)}
.menu-toggle span{position:absolute;left:11px;width:20px;height:1px;background:var(--ink);transition:all .35s var(--ease)}
.menu-toggle span:first-child{top:17px}
.menu-toggle span:last-child{top:24px}
.menu-toggle.is-open span:first-child{top:20px;transform:rotate(45deg)}
.menu-toggle.is-open span:last-child{top:20px;transform:rotate(-45deg)}

/* hero */
.hero{position:relative;overflow:hidden;padding:70px 0 34px;background:radial-gradient(ellipse at 76% 42%,#fff 0%,rgba(255,255,255,0) 58%),var(--paper)}
.hero-watermark{position:absolute;top:26%;left:50%;transform:translateX(-50%);font-family:var(--en);font-size:min(25vw,360px);letter-spacing:.06em;color:rgba(28,26,23,.028);white-space:nowrap;pointer-events:none;user-select:none;line-height:1}
.hero-in{position:relative;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.02fr);gap:20px;align-items:center;min-height:620px}
.hero-copy{position:relative;z-index:2;padding-bottom:20px}
.hero-title{font-family:var(--serif);font-weight:500;font-size:clamp(52px,6.1vw,94px);line-height:1.22;letter-spacing:.015em;margin-bottom:22px}
.red-dot{color:var(--red)}
.hero-en{font-family:var(--en);font-style:italic;font-size:clamp(24px,2.5vw,34px);color:var(--red);letter-spacing:.02em;margin-bottom:34px}
.hero-desc{font-size:16px;line-height:2.1;color:var(--ink-2);margin-bottom:46px}
.hero-cta{display:flex;align-items:center;gap:34px;margin-bottom:64px}
.hero-notes{display:flex;flex-wrap:wrap;gap:0;border-top:1px solid var(--line);padding-top:24px}
.hero-notes span{font-size:12px;color:var(--muted);padding-right:26px;margin-right:26px;border-right:1px solid var(--line);letter-spacing:.03em}
.hero-notes span:last-child{border:0;margin-right:0;padding-right:0}
.hero-notes b{font-family:var(--en);font-size:23px;color:var(--ink);font-weight:500;margin-right:5px;letter-spacing:.02em}
.hero-visual{position:relative;display:flex;align-items:center;justify-content:center;min-height:590px}
.hero-halo{position:absolute;width:min(46vw,600px);height:min(46vw,600px);border-radius:50%;background:radial-gradient(circle at 42% 38%,#fff 0%,#f3eee6 62%,rgba(243,238,230,0) 72%);top:50%;left:50%;transform:translate(-50%,-50%)}
.hero-product{position:relative;width:min(50vw,660px);mix-blend-mode:multiply;filter:drop-shadow(0 40px 45px rgba(60,48,38,.07));animation:float 7s ease-in-out infinite}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
.hero-badge{position:absolute;top:6%;left:2%;display:flex;flex-direction:column;gap:12px;z-index:3;font-size:10px;letter-spacing:.18em;color:var(--muted);line-height:1.7}
.hero-badge span:first-child{font-family:var(--en);font-size:32px;color:var(--red);letter-spacing:0;line-height:1}
.hero-badge i{display:block;width:1px;height:48px;background:var(--line)}
.hero-caption{position:absolute;right:2%;bottom:8%;font-size:10.5px;letter-spacing:.22em;color:var(--muted)}
.hero-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:26px;border-top:1px solid var(--line);font-size:10px;letter-spacing:.22em;color:var(--muted)}
.scroll-hint{display:flex;align-items:center;gap:14px}
.scroll-hint:hover{color:var(--red)}
.scroll-line{display:inline-block;width:46px;height:1px;background:var(--red);position:relative;overflow:hidden}
.scroll-line::after{content:"";position:absolute;top:0;left:-40%;width:40%;height:1px;background:var(--ink);animation:scrollLine 2.4s linear infinite}
@keyframes scrollLine{to{left:120%}}

/* stats */
.stats{background:var(--dark);color:#f4efe8;padding:74px 0}
.stats-in{display:grid;grid-template-columns:repeat(4,1fr);align-items:stretch}
.stat{padding:0 40px;border-left:1px solid rgba(255,255,255,.12);display:flex;flex-direction:column}
.stat:first-child{border-left:0;padding-left:0}
.stat-num,.stat-num-text{font-family:var(--en);font-size:clamp(42px,4.2vw,58px);line-height:1;font-weight:400;letter-spacing:.01em;white-space:nowrap;height:72px;display:flex;align-items:center}
.stat-label{font-size:13px;color:rgba(244,239,232,.82);letter-spacing:.08em;display:flex;flex-direction:column;gap:6px}
.label-cn{display:block;height:24px;line-height:24px}
.label-cn sup{line-height:0;vertical-align:super}
.stat-label em{font-style:normal;font-size:9.5px;letter-spacing:.22em;color:rgba(244,239,232,.42);height:16px;line-height:16px}

/* product */
.product{background:var(--paper)}
.product-stage{display:grid;grid-template-columns:160px minmax(0,1fr) 238px;gap:36px;align-items:center}
.product-tabs{display:flex;flex-direction:column;gap:2px}
.tab{text-align:left;padding:22px 12px 22px 0;border-bottom:1px solid var(--line);font-size:15px;color:var(--muted);display:flex;align-items:center;gap:14px;transition:all .35s var(--ease);position:relative}
.tab span{font-family:var(--en);font-size:17px;color:#bdb4a8;transition:color .35s var(--ease)}
.tab::after{content:"";position:absolute;right:0;bottom:-1px;width:0;height:1px;background:var(--red);transition:width .4s var(--ease)}
.tab:hover,.tab.is-active{color:var(--ink);padding-left:8px}
.tab.is-active::after{width:100%}
.tab.is-active span,.tab:hover span{color:var(--red)}
.product-frame{position:relative;background:#fff;border:1px solid var(--line);aspect-ratio:1/1;display:flex;align-items:center;justify-content:center;overflow:hidden}
.product-frame::before{content:"";position:absolute;inset:26px;border:1px solid rgba(0,0,0,.035);pointer-events:none}
.product-frame img{width:88%;height:88%;object-fit:contain;mix-blend-mode:multiply;transition:opacity .45s var(--ease),transform .6s var(--ease)}
.product-frame img.is-changing{opacity:0;transform:scale(.97)}
.product-frame-tag,.product-frame-note{position:absolute;font-size:9.5px;letter-spacing:.2em;color:#b5ada1;z-index:2}
.product-frame-tag{top:20px;left:24px}
.product-frame-note{bottom:20px;right:24px}
.product-aside{padding-left:6px}
.big-quote{font-family:var(--en);font-size:76px;line-height:.6;color:var(--red);display:block;margin-bottom:34px}
.product-aside>p:first-of-type{font-family:var(--serif);font-size:24px;line-height:1.7;margin-bottom:30px}
.aside-line{width:44px;height:1px;background:var(--red);margin-bottom:26px}
.aside-small{font-size:13px;line-height:2.1;color:var(--muted);margin-bottom:36px}
.aside-spec{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:11.5px;color:var(--ink-2)}
.aside-spec span{font-family:var(--en);color:var(--red);font-size:15px}
.aside-spec i{width:1px;height:11px;background:var(--line);margin:0 4px}
.product-trio{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:110px}
.trio-img{overflow:hidden;background:var(--paper-2);aspect-ratio:4/4.4}
.trio-img img{width:100%;height:100%;object-fit:cover;object-position:center top;transition:transform 1s var(--ease)}
.trio-card:hover .trio-img img{transform:scale(1.045)}
.trio-card figcaption{padding-top:24px}
.trio-card figcaption>span{font-size:10px;letter-spacing:.2em;color:var(--red)}
.trio-card h3{font-family:var(--serif);font-size:23px;font-weight:500;margin:12px 0}
.trio-card p{font-size:13.5px;color:var(--muted);line-height:1.95}

/* tech */
.tech{background:var(--paper-2)}
.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0 46px}
.tech-card{position:relative;border-top:1px solid #dcd4c8;padding:38px 4px 44px 0;transition:transform .5s var(--ease)}
.tech-card:hover{transform:translateY(-6px)}
.tech-no{font-family:var(--en);font-size:18px;color:var(--red);position:absolute;right:0;top:38px}
.tech-icon{width:46px;height:46px;color:var(--red);margin-bottom:30px}
.tech-icon svg{width:100%;height:100%}
.tech-card h3{font-family:var(--serif);font-size:24px;font-weight:500;margin-bottom:8px}
.tech-en{font-size:9.5px;letter-spacing:.22em;color:var(--red);margin-bottom:20px}
.tech-card>p:last-child{font-size:13.5px;line-height:2;color:var(--ink-2);max-width:330px}
.tech .fine-print{margin-top:46px;padding-top:24px;border-top:1px solid #dcd4c8}

/* statement */
.statement{position:relative;min-height:740px;display:flex;align-items:center;overflow:hidden;color:#fff}
.statement-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 42%}
.statement-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(16,14,12,.92) 0%,rgba(16,14,12,.74) 44%,rgba(16,14,12,.38) 82%)}
.statement-in{position:relative;z-index:2;padding-top:20px}
.statement-title{font-family:var(--serif);font-size:clamp(46px,5.4vw,80px);line-height:1.35;font-weight:400;letter-spacing:.04em;margin-bottom:48px}
.statement-meta{display:flex;align-items:center;gap:22px;font-size:13px;letter-spacing:.1em;color:rgba(255,255,255,.82);margin-bottom:64px}
.statement-meta i{width:1px;height:15px;background:rgba(255,255,255,.4)}
.warranty-badge{display:inline-flex;align-items:center;gap:16px;border-top:1px solid rgba(194,166,117,.5);border-bottom:1px solid rgba(194,166,117,.5);padding:16px 0}
.warranty-badge>span{font-family:var(--en);font-size:52px;color:var(--gold);line-height:1}
.warranty-badge div{display:flex;flex-direction:column}
.warranty-badge b{font-size:11px;letter-spacing:.24em;color:var(--gold);font-weight:500}
.warranty-badge em{font-style:normal;font-size:13px;letter-spacing:.16em;color:rgba(255,255,255,.7)}

/* how */
.how{background:var(--paper)}
.how-in{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.9fr);gap:110px;align-items:center}
.how-copy .section-lead{margin:30px 0 46px}
.steps li{display:flex;gap:30px;border-top:1px solid var(--line);padding:30px 0}
.steps li:last-child{border-bottom:1px solid var(--line)}
.step-no{font-family:var(--en);font-size:34px;color:var(--red);line-height:1;flex:0 0 54px}
.steps h3{font-family:var(--serif);font-size:23px;font-weight:500;margin-bottom:8px}
.steps p{font-size:13.5px;color:var(--muted);line-height:1.95;margin-bottom:8px}
.steps em{font-style:normal;font-size:9.5px;letter-spacing:.2em;color:#b3aa9e}
.how-visual{position:relative;border:1px solid var(--line);background:#fff}
.how-visual img{width:100%}
.how-visual-tag{position:absolute;bottom:0;left:0;right:0;background:rgba(250,248,245,.94);font-size:10px;letter-spacing:.2em;color:var(--muted);padding:14px 20px}

/* scenes */
.scenes{background:var(--paper-2)}
.scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.scene-img{overflow:hidden;background:#fff;aspect-ratio:4/4.6}
.scene-img img{width:100%;height:100%;object-fit:cover;object-position:center top;transition:transform 1s var(--ease)}
.scene-card:hover .scene-img img{transform:scale(1.045)}
.scene-card figcaption{padding-top:24px}
.scene-card figcaption>span{font-size:10px;letter-spacing:.2em;color:var(--red)}
.scene-card h3{font-family:var(--serif);font-size:25px;font-weight:500;margin:12px 0 8px}
.scene-card p{font-size:13.5px;color:var(--muted)}
.scene-more{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:100px;align-items:center;margin-top:110px;padding-top:90px;border-top:1px solid #dcd4c8}
.scene-more img{width:100%;border:1px solid var(--line)}
.scene-more h3{font-family:var(--serif);font-size:clamp(30px,3.2vw,46px);font-weight:500;line-height:1.45;margin:16px 0 26px}
.scene-more-copy>p:not(.eyebrow){font-size:14px;line-height:2.1;color:var(--ink-2);margin-bottom:34px;max-width:390px}

/* compare */
.compare{background:#fff}
.compare-in{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:100px;align-items:center}
.compare-visual img{width:100%;border:1px solid var(--line)}
.compare-lead{font-size:15px;line-height:2.1;color:var(--ink-2);margin:34px 0 46px;max-width:430px}
.compare-bar{display:flex;flex-direction:column;gap:20px;margin-bottom:36px}
.bar-item{display:grid;grid-template-columns:64px minmax(0,1fr) 72px;align-items:center;gap:18px}
.bar-item>span{font-size:9.5px;letter-spacing:.18em;color:var(--muted)}
.bar-item b{font-size:12px;font-weight:400;color:var(--ink-2);text-align:right}
.bar-track{height:8px;background:var(--paper-2);border-radius:8px;overflow:hidden}
.bar-track i{display:block;height:100%;background:#d9d1c6;border-radius:8px}
.bar-track i.is-after{background:var(--red)}

/* specs */
.specs{background:var(--paper)}
.specs-in{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:90px;align-items:start}
.specs-visual{position:relative}
.specs-visual img{width:100%;border:1px solid var(--line)}
.specs-visual-tag{position:absolute;top:0;left:0;background:var(--red);color:#fff;font-size:9.5px;letter-spacing:.2em;padding:12px 18px}
.specs-table dl>div{display:grid;grid-template-columns:38% 1fr;gap:20px;border-bottom:1px solid var(--line);padding:19px 0;align-items:center}
.specs-table dl>div:first-child{border-top:1px solid var(--line)}
.specs-table dt{font-size:14px;color:var(--ink-2);display:flex;flex-direction:column}
.specs-table dt em{font-style:normal;font-size:9px;letter-spacing:.18em;color:#b3aa9e;margin-top:3px}
.specs-table dd{font-size:15px;font-family:var(--serif);display:flex;flex-direction:column}
.specs-table dd span{font-family:var(--sans);font-size:11.5px;color:var(--muted);margin-top:4px;letter-spacing:.02em}
.specs-table .fine-print{margin-top:26px}

/* gallery */
.gallery{background:var(--paper-2)}
.gallery-filters{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:44px}
.gallery-filters button{border:1px solid #d8d0c4;padding:9px 20px;font-size:12.5px;color:var(--ink-2);letter-spacing:.06em;transition:all .35s var(--ease)}
.gallery-filters button:hover{border-color:var(--red);color:var(--red)}
.gallery-filters button.is-active{background:var(--red);border-color:var(--red);color:#fff}
.gallery-grid{columns:4;column-gap:16px}
.gi{break-inside:avoid;margin-bottom:16px;position:relative;overflow:hidden;background:#fff;cursor:zoom-in;display:block;border:1px solid rgba(0,0,0,.03)}
.gi img{width:100%;height:auto;transition:transform .9s var(--ease),opacity .6s var(--ease)}
.gi:hover img{transform:scale(1.04)}
.gi-cap{position:absolute;left:0;right:0;bottom:0;padding:28px 16px 14px;background:linear-gradient(transparent,rgba(20,18,16,.78));color:#fff;opacity:0;transform:translateY(8px);transition:all .45s var(--ease);display:flex;justify-content:space-between;align-items:flex-end;gap:10px}
.gi:hover .gi-cap{opacity:1;transform:none}
.gi-cap b{font-size:12.5px;font-weight:400;line-height:1.5}
.gi-cap i{font-style:normal;font-size:9px;letter-spacing:.16em;color:rgba(255,255,255,.65);white-space:nowrap}
.gi.is-hidden{display:none}

/* brand */
.brand-statement{position:relative;min-height:620px;display:flex;align-items:center;justify-content:center;text-align:center;color:#fff;overflow:hidden}
.brand-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 50%}
.brand-shade{position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,14,12,.72),rgba(15,14,12,.84))}
.brand-in{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center}
.brand-logo{width:126px;margin-bottom:50px}
.brand-in .eyebrow{margin-bottom:24px}
.brand-in h2{font-family:var(--serif);font-size:clamp(38px,4.6vw,66px);font-weight:400;line-height:1.5;letter-spacing:.06em}
.brand-slogan{margin-top:34px;font-size:13px;letter-spacing:.4em;color:rgba(255,255,255,.7)}

/* footer */
.footer{background:#131210;color:#b8b0a4;padding:90px 0 30px;font-size:13px}
.footer-top{display:flex;justify-content:space-between;gap:60px;padding-bottom:70px}
.footer-brand img{width:120px;margin-bottom:24px}
.footer-brand p{font-size:14px;letter-spacing:.22em;color:#e7e0d6;margin-bottom:10px}
.footer-en{font-size:9.5px;letter-spacing:.24em;color:#7d766c}
.footer-nav{display:grid;grid-template-columns:repeat(2,auto);gap:14px 60px;align-content:start}
.footer-nav a{font-size:13px;transition:color .3s}
.footer-nav a:hover{color:var(--gold)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;gap:24px;border-top:1px solid rgba(255,255,255,.1);padding-top:26px;font-size:11px;color:#7d766c;letter-spacing:.03em}
.footer-disclaimer{text-align:center}
.footer-top-link{color:#b8b0a4;white-space:nowrap}
.footer-top-link:hover{color:var(--gold)}

/* lightbox */
.lightbox{position:fixed;inset:0;z-index:1000;background:rgba(14,13,11,.96);display:flex;align-items:center;justify-content:center;padding:60px 90px}
.lightbox[hidden]{display:none}
.lb-figure{margin:0;max-width:min(100%,1000px);max-height:100%;display:flex;flex-direction:column;align-items:center;gap:18px}
.lb-figure img{max-width:100%;max-height:calc(100vh - 170px);width:auto;height:auto;object-fit:contain;background:#fff}
.lb-figure figcaption{width:100%;display:flex;justify-content:space-between;color:#e6ded3;font-size:13px;letter-spacing:.08em}
.lb-figure figcaption em{font-style:normal;color:#8e8579;font-size:11px;letter-spacing:.18em}
.lb-close,.lb-nav{position:absolute;color:#fff;font-family:var(--sans);transition:all .3s var(--ease);z-index:2}
.lb-close{top:26px;right:36px;font-size:34px;line-height:1;font-weight:200}
.lb-nav{top:50%;transform:translateY(-50%);font-size:52px;font-weight:200;width:60px;height:80px}
.lb-prev{left:16px}.lb-next{right:16px}
.lb-close:hover,.lb-nav:hover{color:var(--gold)}
.to-top{position:fixed;right:28px;bottom:28px;z-index:90;width:46px;height:46px;border:1px solid var(--line);background:rgba(250,248,245,.94);color:var(--ink);font-size:18px;opacity:0;pointer-events:none;transform:translateY(12px);transition:all .4s var(--ease)}
.to-top.is-visible{opacity:1;pointer-events:auto;transform:none}
.to-top:hover{background:var(--red);color:#fff;border-color:var(--red)}

/* ===================== responsive ===================== */
@media (max-width:1180px){
  .wrap{padding:0 40px}
  .nav{gap:22px}
  .nav a{font-size:12.5px}
  .product-stage{grid-template-columns:1fr;gap:30px}
  .product-tabs{flex-direction:row;flex-wrap:wrap;gap:8px}
  .tab{border:1px solid var(--line);padding:12px 18px}
  .tab::after{display:none}
  .tab.is-active{background:var(--red);color:#fff;border-color:var(--red);padding-left:18px}
  .tab.is-active span{color:rgba(255,255,255,.75)}
  .product-aside{display:grid;grid-template-columns:auto 1fr;gap:0 26px;align-items:start}
  .big-quote{grid-row:span 3}
  .aside-line{display:none}
  .aside-small{margin:14px 0 20px}
  .product-frame{max-width:720px;width:100%;margin:0 auto}
  .tech-grid{gap:0 30px}
  .how-in,.compare-in,.scene-more{gap:60px}
}
@media (max-width:900px){
  html{scroll-padding-top:74px}
  .wrap{padding:0 28px}
  .section{padding:96px 0}
  .section-head{flex-direction:column;align-items:flex-start;gap:24px;margin-bottom:52px}
  .section-lead{max-width:100%}
  .nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--paper);flex-direction:column;align-items:stretch;gap:0;padding:16px 28px 24px;box-shadow:0 18px 30px rgba(28,26,23,.08);border-bottom:1px solid var(--line)}
  .nav.is-open{display:flex}
  .nav a{padding:14px 0;border-bottom:1px solid var(--line);font-size:15px}
  .nav a::after{display:none}
  .menu-toggle{display:block}
  .header-actions .btn{display:none}
  .hero{padding:44px 0 26px}
  .hero-in{grid-template-columns:1fr;min-height:0;gap:10px}
  .hero-copy{padding-top:20px}
  .hero-title{font-size:clamp(46px,9vw,74px)}
  .hero-cta{margin-bottom:44px}
  .hero-visual{min-height:430px}
  .hero-product{width:min(76vw,520px)}
  .hero-halo{width:78vw;height:78vw}
  .hero-badge{top:0;left:0}
  .hero-watermark{top:44%}
  .stats-in{grid-template-columns:repeat(2,1fr);gap:0}
  .stat{padding:26px 24px;border-left:0;border-top:1px solid rgba(255,255,255,.12)}
  .stat:first-child{padding-left:24px}
  .stat:nth-child(odd){border-right:1px solid rgba(255,255,255,.12)}
  .stat:nth-child(-n+2){border-top:0}
  .product-trio,.scene-grid,.tech-grid{grid-template-columns:repeat(2,1fr)}
  .tech-grid{gap:0 28px}
  .statement{min-height:560px}
  .statement-shade{background:linear-gradient(90deg,rgba(16,14,12,.9),rgba(16,14,12,.5))}
  .how-in,.compare-in,.scene-more,.specs-in{grid-template-columns:1fr;gap:56px}
  .how-visual{max-width:520px}
  .scene-more{padding-top:60px;margin-top:70px}
  .compare-visual{max-width:520px}
  .specs-visual{max-width:520px}
  .gallery-grid{columns:3}
  .lightbox{padding:60px 50px}
}
@media (max-width:600px){
  .announce-cn{display:none}
  .announce{font-size:9.5px}
  .wrap{padding:0 20px}
  .section{padding:78px 0}
  .eyebrow{font-size:10px;letter-spacing:.14em;margin-bottom:24px}
  .h2{font-size:34px}
  .hero-title{font-size:clamp(42px,11vw,58px)}
  .hero-en{font-size:24px}
  .hero-desc{font-size:14.5px}
  .hero-cta{gap:22px;flex-wrap:wrap}
  .btn-solid{padding:15px 26px}
  .hero-notes{gap:12px 0}
  .hero-notes span{padding-right:14px;margin-right:14px;font-size:11px}
  .hero-notes b{font-size:19px}
  .hero-visual{min-height:340px}
  .hero-badge{display:none}
  .hero-product{width:86vw}
  .hero-halo{width:92vw;height:92vw}
  .hero-caption{font-size:9px}
  .hero-bottom{font-size:9px}
  .stats{padding:46px 0}
  .stat{padding:22px 14px}
  .stat:first-child{padding-left:14px}
  .stat-num,.stat-num-text{font-size:44px}
  .stat-label em{font-size:9px;letter-spacing:.12em;white-space:nowrap}
  .product-trio,.scene-grid,.tech-grid{grid-template-columns:1fr}
  .tech-card{padding:30px 0 34px}
  .product-aside{display:block}
  .big-quote{font-size:56px;margin-bottom:20px}
  .aside-line{display:block}
  .statement{min-height:480px}
  .statement-title{font-size:40px}
  .statement-meta{flex-wrap:wrap;gap:12px;font-size:11.5px;margin-bottom:44px}
  .brand-statement{min-height:480px}
  .brand-logo{width:100px;margin-bottom:34px}
  .brand-slogan{letter-spacing:.24em}
  .gallery-grid{columns:2;column-gap:10px}
  .gi{margin-bottom:10px}
  .gi img{aspect-ratio:1/1;object-fit:cover;object-position:center top}
  .gi-cap{padding:18px 10px 10px}
  .gi-cap b{font-size:10.5px}
  .gi-cap i{display:none}
  .footer{padding:64px 0 26px}
  .footer-top{flex-direction:column;gap:44px;padding-bottom:44px}
  .footer-nav{grid-template-columns:repeat(2,1fr);gap:12px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:10px}
  .footer-disclaimer{text-align:left}
  .lightbox{padding:60px 20px}
  .lb-nav{width:36px;font-size:38px}
  .lb-prev{left:0}.lb-next{right:0}
  .lb-close{right:16px}
  .to-top{right:16px;bottom:16px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal{opacity:1;transform:none}
}