/* Lumetion 官网 v0.4 · 黑白灰块面
   页面只用黑白灰，颜色只留给照片；映光青只在 LOGO 里。 */
:root{
  --black:#0A0A0A;
  --ink:#111111;
  --char:#161616;
  --grey:#E3E3E1;
  --mid:#8C8C8A;
  --white:#FFFFFF;
  --sans:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --gutter:clamp(20px,4.2vw,72px);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--black);color:var(--white);font-family:var(--sans);font-weight:400;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.m-br{display:none}
@media (max-width:760px){.m-br{display:inline}}
h1,h2{margin:0;font-weight:300;letter-spacing:.02em;line-height:1.18}
p{margin:0}
.label{font-size:12px;letter-spacing:.24em;text-transform:uppercase;font-weight:500;opacity:.55;margin-bottom:28px}
.wrap{padding:0 var(--gutter)}

/* 导航 */
.nav{position:fixed;inset:0 0 auto 0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:22px var(--gutter);transition:color .4s,background .4s}
.nav-logo{position:relative;display:block;height:26px;width:84px}
.nav-logo img{position:absolute;inset:0;height:26px;width:auto;transition:opacity .4s}
.nav .logo-light{display:none}
.nav{transition:transform .45s cubic-bezier(.2,.7,.2,1),background .4s}
.nav.solid{background:rgba(10,10,10,.88);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}
.nav.hide{transform:translateY(-100%)}
.nav-links{display:flex;gap:clamp(18px,2.6vw,44px);font-size:14px;letter-spacing:.08em}
.nav-links a{opacity:.82;transition:opacity .2s}
.nav-links a:hover{opacity:1}
.nav-cta{border-bottom:1px solid currentColor;padding-bottom:2px}

/* 01 首屏 */
.hero{position:relative;height:100svh;min-height:560px;overflow:hidden;background:#3a3c3f}
.hero img,.closing img{width:100%;height:100%;object-fit:cover}
.hero img{object-position:70% 30%}
.hero-text{position:absolute;left:var(--gutter);bottom:clamp(56px,11vh,120px);max-width:46%}
.hero .eyebrow{font-size:13px;letter-spacing:.2em;opacity:.7;margin-bottom:26px}
.hero h1{font-size:clamp(34px,4.4vw,72px)}
.hero-index{position:absolute;right:var(--gutter);bottom:clamp(56px,11vh,120px);font:400 12px/1 var(--sans);letter-spacing:.2em;opacity:.6}
.hero-index span{opacity:1;color:var(--white)}

/* 02 宣言 */
.statement{background:var(--white);color:var(--ink);padding:clamp(120px,20vh,220px) 0}
.statement h2{font-size:clamp(48px,8.6vw,148px);font-weight:300;letter-spacing:0;line-height:1.08}
.statement .sub{margin-top:clamp(36px,6vh,64px);font-size:clamp(16px,1.3vw,20px);color:#555}

/* 03 场景 */
.statement{padding-bottom:clamp(60px,10vh,120px)}
.genres{background:var(--white);color:var(--ink);padding:clamp(60px,10vh,120px) 0 0}
.genres-head{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:clamp(40px,7vh,80px)}
.genres-head .label{margin:0;order:2}
.genres h2{font-size:clamp(32px,3.6vw,60px)}
.mosaic{display:grid;grid-template-columns:repeat(4,1fr);gap:2px}
.mosaic figure{position:relative;margin:0;overflow:hidden}
.mosaic .g-big{grid-column:span 2;grid-row:span 2}
.g-slot{aspect-ratio:4/5;height:100%;background:#d9d9d7}
.g-big .g-slot{aspect-ratio:auto}
.g-slot img{width:100%;height:100%;object-fit:cover;transition:transform 1.4s cubic-bezier(.2,.7,.2,1)}
.mosaic figure:hover img{transform:scale(1.04)}
.genres .slot-pending{background:repeating-linear-gradient(135deg,#e2e2e0 0 1px,#ececea 1px 14px)}
.genres .slot-pending span{color:#999}
.mosaic figcaption{position:absolute;left:20px;bottom:18px;color:#fff;font-size:14px;letter-spacing:.16em;text-shadow:0 1px 12px rgba(0,0,0,.35)}
.genres .slot-pending + figcaption{color:var(--ink);text-shadow:none}

/* 04–06 功能 */
.feature{display:grid;grid-template-columns:1fr 1fr;align-items:stretch}
.feature-dark{background:var(--black)}
.feature-white{background:var(--white);color:var(--ink)}
.feature-light{background:var(--grey);color:var(--ink)}
.feature-flip .compare{order:2}
.feature-text{display:flex;flex-direction:column;justify-content:flex-end;padding:var(--gutter);padding-bottom:clamp(56px,10vh,110px)}
.feature-text h2{font-size:clamp(40px,5.2vw,88px);margin-bottom:32px}
.feature-text p{font-size:clamp(15px,1.15vw,18px);max-width:22em;opacity:.78}
.feature-text .hint{margin-top:44px;font-size:12px;letter-spacing:.2em;opacity:.45}

/* 前后对比 */
.compare{position:relative;overflow:hidden;cursor:ew-resize;touch-action:pan-y;user-select:none;-webkit-user-select:none}
.compare img{width:100%;height:100%;object-fit:cover;pointer-events:none}
#skin .compare{aspect-ratio:1/1}
.feature-flip .compare,.c-45{aspect-ratio:4/5}
.c-before{position:absolute;inset:0;clip-path:polygon(0 0,100% 0,100% 100%,0 100%)}
.c-light{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}
.c-light line{vector-effect:non-scaling-stroke;stroke:#fff}
.c-light .edge{stroke-width:1.2;stroke-opacity:.9}
.c-light .glow{stroke-width:90;stroke-opacity:.14;filter:blur(24px)}
.c-tag{position:absolute;bottom:20px;font-size:11px;letter-spacing:.22em;color:#fff;background:rgba(0,0,0,.42);padding:6px 10px;transition:opacity .3s}
.c-tag-before{right:20px}
.c-tag-after{left:20px}

/* 05 细节三联 */
.details{background:var(--char);padding:clamp(110px,16vh,180px) 0 clamp(80px,12vh,140px)}
.details h2{font-size:clamp(32px,3.6vw,60px);margin-bottom:clamp(56px,9vh,100px)}
.triptych{display:grid;grid-template-columns:repeat(3,1fr);gap:2px}
.triptych figure{margin:0}
.slot{aspect-ratio:4/5;overflow:hidden;background:#2A2A2A}
.slot img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s cubic-bezier(.2,.7,.2,1)}
.triptych figure:hover .slot img{transform:scale(1.03)}
.slot-pending{display:flex;align-items:center;justify-content:center;background:repeating-linear-gradient(135deg,#262626 0 1px,#222 1px 14px)}
.slot-pending span{font-size:12px;letter-spacing:.24em;color:#777;text-align:center;line-height:2.2}
.triptych figcaption{padding:24px var(--gutter) 0 clamp(16px,2vw,28px);font-size:14px;color:#9a9a98;max-width:24em}
.triptych figcaption b{display:block;font-weight:500;color:#fff;font-size:16px;margin-bottom:6px;letter-spacing:.06em}

.duo{display:grid;grid-template-columns:1fr 1fr;gap:2px}
.duo figure{margin:0}
.duo figcaption{padding:24px var(--gutter) 0 clamp(16px,2vw,28px);font-size:14px;color:#9a9a98;max-width:26em}
.duo figcaption b{display:block;font-weight:500;color:#fff;font-size:16px;margin-bottom:6px;letter-spacing:.06em}

/* 08 格式 */
.formats{background:var(--grey);color:var(--ink);padding:clamp(110px,16vh,180px) 0 clamp(80px,12vh,130px)}
.formats h2{font-size:clamp(32px,3.6vw,60px);margin-bottom:clamp(56px,9vh,96px)}
.cams{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid #bdbdbb;border-left:1px solid #bdbdbb}
.cams li{display:flex;flex-direction:column;justify-content:space-between;gap:28px;min-height:clamp(120px,11vw,170px);padding:22px 24px;border-right:1px solid #bdbdbb;border-bottom:1px solid #bdbdbb;transition:background .3s,color .3s}
.cams li:hover{background:var(--ink);color:#fff}
.cams .brand{font-family:"Inter",sans-serif;font-weight:500;font-size:clamp(18px,1.7vw,26px);letter-spacing:.04em}
.cams .brand{line-height:1;white-space:nowrap}
/* 品牌名按各家字形气质排，只作辨识，不复制标识 */
.b-canon{font-family:"Roboto Slab",serif!important;font-weight:700!important;font-size:clamp(22px,2vw,30px)!important;letter-spacing:-.01em!important}
.b-nikon{font-family:"Archivo",sans-serif!important;font-style:italic;font-weight:800!important;letter-spacing:-.02em!important}
.b-sony{font-family:"Roboto Slab",serif!important;font-weight:700!important;letter-spacing:.16em!important}
.b-fuji{font-family:"Archivo",sans-serif!important;font-weight:800!important;font-stretch:112%;letter-spacing:.02em!important}
.b-pentax{font-family:"Archivo",sans-serif!important;font-weight:900!important;font-stretch:125%;letter-spacing:.06em!important}
.b-pana{font-family:"Inter",sans-serif!important;font-weight:800!important;letter-spacing:-.03em!important}
.b-om{font-family:"Inter",sans-serif!important;font-weight:300!important;letter-spacing:.22em!important}
.b-leica{font-family:"Cormorant Garamond",serif!important;font-style:italic;font-weight:600!important;font-size:clamp(24px,2.3vw,34px)!important}
.b-hb{font-family:"Inter",sans-serif!important;font-weight:400!important;font-size:clamp(14px,1.25vw,19px)!important;letter-spacing:.26em!important}
.b-p1{font-family:"Archivo",sans-serif!important;font-weight:700!important;font-stretch:88%;letter-spacing:.04em!important}
.cams .ext{font-family:"Inter",sans-serif;font-size:12px;letter-spacing:.18em;opacity:.55}
.files{list-style:none;margin:clamp(48px,7vh,72px) 0 0;padding:0;display:flex;flex-wrap:wrap;gap:20px}
.file{position:relative;width:76px;height:96px;background:#fff;clip-path:polygon(0 0,74% 0,100% 22%,100% 100%,0 100%);display:flex;align-items:flex-end;justify-content:center;padding-bottom:14px}
.file::before{content:"";position:absolute;right:0;top:0;width:26%;height:22%;background:#cfcfcd}
.file span{font:500 13px/1 "Inter",sans-serif;letter-spacing:.08em}
.file:first-child{background:var(--ink);color:#fff}
.formats-note{margin-top:40px;font-size:12px;color:#888}

/* 结尾 */
.closing{position:relative;height:100svh;min-height:560px;overflow:hidden;background:#232528}
.closing img{object-position:30% 30%}
.closing-text{position:absolute;right:var(--gutter);top:50%;transform:translateY(-50%);width:min(40%,520px)}
.closing h2{font-size:clamp(40px,5vw,84px);margin-bottom:28px}
.closing p{opacity:.72;font-size:clamp(15px,1.15vw,18px)}
.actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:44px}
.btn{display:inline-block;padding:15px 28px;font-size:14px;letter-spacing:.12em;transition:background .25s,color .25s}
.btn-solid{background:#fff;color:var(--ink)}
.btn-solid:hover{background:#d8d8d6}
.btn-line{border:1px solid rgba(255,255,255,.6)}
.btn-line:hover{background:#fff;color:var(--ink)}

/* 页脚 */
.footer{background:#000;padding:72px var(--gutter) 40px;font-size:13px;color:#8a8a88}
.footer-top{display:flex;justify-content:space-between;align-items:center;padding-bottom:56px;border-bottom:1px solid #222}
.footer-logo{height:24px;width:auto}
.footer-top nav{display:flex;gap:32px;color:#ccc}
.footer-bottom{display:flex;flex-wrap:wrap;gap:12px 32px;justify-content:space-between;padding-top:28px}
.beian{display:flex;flex-wrap:wrap;gap:8px 24px}
.beian a:hover,.footer-top nav a:hover{color:#fff}

/* 手机 */
@media (max-width:760px){
  .nav{padding:18px 20px}
  .nav-links{gap:18px;font-size:13px;letter-spacing:.04em}
  .hero img{object-position:50% 20%}
  .hero::after,.closing::after{content:"";position:absolute;inset:auto 0 0 0;height:55%;background:linear-gradient(to top,rgba(0,0,0,.72),transparent)}
  .hero-text{max-width:none;right:20px;bottom:64px;z-index:1}
  .hero-index{display:none}
  .statement{padding:110px 0}
  .feature{grid-template-columns:1fr}
  .feature-flip .compare{order:0}
  .feature-text{padding:48px 20px 72px}
  .triptych,.duo{grid-template-columns:1fr;gap:48px}
  .genres-head{display:block}
  .genres-head .label{margin-bottom:24px}
  .mosaic{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;gap:2px;padding:0}
  .mosaic figure{flex:0 0 78vw;scroll-snap-align:start}
  .g-big .g-slot{aspect-ratio:4/5}
  .cams{grid-template-columns:repeat(2,1fr)}
  .cams li{min-height:110px;padding:18px}
  .duo figcaption{padding:18px 20px 0}
  .slot-pending{aspect-ratio:16/9}
  .triptych figcaption{padding:18px 20px 0}
  .closing img{object-position:50% 20%}
  .closing-text{left:20px;right:20px;top:auto;bottom:56px;transform:none;width:auto;z-index:1}
  .footer-top{flex-direction:column;align-items:flex-start;gap:28px}
  .footer-top nav{gap:22px}
  .footer-bottom{flex-direction:column}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* v0.6 一屏适配：桌面端每个板块不超过一屏高度，标题字号整体收小 */
@media (min-width:761px){
  .label{margin-bottom:18px}
  .hero h1{font-size:clamp(30px,3.3vw,56px)}
  .hero .eyebrow{margin-bottom:18px}
  .statement{padding:clamp(80px,14vh,150px) 0 clamp(48px,8vh,96px)}
  .statement h2{font-size:clamp(40px,5.8vw,100px)}
  .genres{padding-top:clamp(48px,8vh,88px)}
  .genres-head{margin-bottom:clamp(24px,4vh,44px)}
  .genres h2,.details h2,.formats h2{font-size:clamp(28px,2.8vw,46px)}
  .mosaic{grid-template-rows:1fr 1fr;height:min(calc(100svh - 245px),62.5vw);min-height:420px}
  .mosaic .g-slot{aspect-ratio:auto;height:100%}
  .mosaic img{object-position:50% 30%}
  .feature{height:min(100svh,62.5vw);min-height:520px}
  #skin.feature{height:min(100svh,50vw)}
  .feature .compare{aspect-ratio:auto!important;height:100%}
  .feature-text h2{font-size:clamp(32px,3.6vw,60px);margin-bottom:22px}
  .feature-text .hint{margin-top:28px}
  .details{padding:clamp(56px,9vh,100px) 0 clamp(48px,7vh,80px)}
  .details h2{margin-bottom:clamp(24px,4vh,44px)}
  .duo .compare{aspect-ratio:auto!important;height:max(300px,min(calc(100svh - 390px),50vw))}
  .duo figcaption{padding-top:16px}
  .formats{padding:clamp(56px,9vh,100px) 0 clamp(48px,7vh,80px)}
  .formats h2{margin-bottom:clamp(24px,4vh,48px)}
  .cams li{min-height:clamp(84px,7vw,118px);padding:16px 20px;gap:16px}
  .files{margin-top:clamp(24px,4vh,40px);gap:14px}
  .file{width:58px;height:74px;padding-bottom:10px}
  .formats-note{margin-top:22px}
  .closing h2{font-size:clamp(32px,3.6vw,60px);margin-bottom:20px}
}