/* ============================================================
   Yijia Stone — Lianjiang Yijia Stone Co., Ltd.
   Design system + layout. No external image assets required.
   ============================================================ */

/* ---------- 1. Tokens ---------- */
:root{
  --ink:#0e0e0d;
  --ink-2:#171715;
  --ink-3:#232320;
  --stone:#f2efe9;
  --stone-2:#e5e0d6;
  --line:#d8d2c6;
  --muted:#736d63;
  --brass:#a97c3f;
  --brass-lt:#d2a761;
  --white:#fff;

  --ff-display:"Fraunces","Playfair Display",Georgia,"Songti SC","Noto Serif SC",serif;
  --ff-body:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;

  --max:1240px;
  --pad:clamp(20px,5vw,56px);
  --r:2px;

  --noise:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.34' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.85'/%3E%3C/svg%3E");
  --noise-fine:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='m'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.55' numOctaves='5' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23m)' opacity='0.4'/%3E%3C/svg%3E");
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:80px;overflow-x:clip}
body{
  font-family:var(--ff-body);
  font-size:16px;line-height:1.7;
  color:var(--ink);background:var(--stone);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{list-style:none}
::selection{background:var(--brass);color:#fff}

h1,h2,h3,h4{font-family:var(--ff-display);font-weight:400;line-height:1.12;letter-spacing:-.02em}

.container{max-width:var(--max);margin:0 auto;padding-inline:var(--pad)}
.skip{position:absolute;left:-9999px}
.skip:focus{left:16px;top:16px;z-index:200;background:var(--brass);color:#fff;padding:10px 18px}

/* ---------- 3. Type helpers ---------- */
.eyebrow{
  font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  font-weight:600;color:var(--brass);display:flex;align-items:center;gap:12px;
}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--brass);flex:none}
.eyebrow.center{justify-content:center}
.eyebrow.center::after{content:"";width:28px;height:1px;background:var(--brass);flex:none}

.h2{font-size:clamp(28px,4.2vw,48px)}
.lead{font-size:clamp(15px,1.6vw,17px);color:var(--muted);max-width:60ch}
.on-dark .lead{color:#a9a49a}

/* ---------- 4. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:15px 30px;border-radius:var(--r);
  font-size:14px;font-weight:600;letter-spacing:.04em;
  border:1px solid transparent;transition:all .28s ease;white-space:nowrap;
}
.btn svg{width:15px;height:15px;flex:none}
.btn-solid{background:var(--brass);color:#fff}
.btn-solid:hover{background:#8f6731;transform:translateY(-2px);box-shadow:0 10px 24px rgba(169,124,63,.3)}
.btn-line{border-color:var(--ink);color:var(--ink)}
.btn-line:hover{background:var(--ink);color:var(--stone)}
.btn-ghost{border-color:rgba(255,255,255,.32);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.6)}
.btn-wa{background:#159a55;color:#fff}
.btn-wa:hover{background:#117f46;transform:translateY(-2px)}

/* ---------- 5. Nav ---------- */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:100;
  transition:background .35s ease,box-shadow .35s ease,border-color .35s ease;
  border-bottom:1px solid transparent;
}
.nav-inner{
  max-width:var(--max);margin:0 auto;padding-inline:var(--pad);
  height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.brand{display:flex;align-items:center;gap:12px;color:#fff;transition:color .35s}
.brand-mark{
  width:38px;height:38px;flex:none;border:1px solid rgba(255,255,255,.45);
  display:grid;place-items:center;
  font-family:var(--ff-display);font-size:15px;letter-spacing:.02em;color:var(--brass-lt);
  transition:border-color .35s;
}
.brand-txt{display:flex;flex-direction:column;line-height:1.15}
.brand-txt b{font-family:var(--ff-display);font-size:17px;font-weight:600;letter-spacing:.01em}
.brand-txt span{font-size:9px;letter-spacing:.18em;text-transform:uppercase;opacity:.6;white-space:nowrap}

.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{
  font-size:13.5px;font-weight:500;color:rgba(255,255,255,.86);
  position:relative;padding:6px 0;transition:color .25s;
}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;
  background:var(--brass-lt);transition:width .3s ease;
}
.nav-links a:hover{color:#fff}
.nav-links a:hover::after{width:100%}

.nav-right{display:flex;align-items:center;gap:14px}
.lang{display:flex;align-items:center;gap:6px;font-size:12px;color:rgba(255,255,255,.6)}
.lang a{padding:4px 6px;transition:color .2s;white-space:nowrap}
.lang a:hover{color:#fff}
.lang a.active{color:var(--brass-lt);font-weight:600}
.lang i{width:1px;height:11px;background:rgba(255,255,255,.28)}
.nav-cta{padding:11px 22px;font-size:13px}

/* scrolled state */
.nav.solid{background:rgba(242,239,233,.96);backdrop-filter:blur(14px);border-bottom-color:var(--line)}
.nav.solid .brand{color:var(--ink)}
.nav.solid .brand-mark{border-color:var(--line);color:var(--brass)}
.nav.solid .nav-links a{color:#3a362f}
.nav.solid .nav-links a:hover{color:var(--ink)}
.nav.solid .nav-links a::after{background:var(--brass)}
.nav.solid .lang{color:var(--muted)}
.nav.solid .lang a:hover{color:var(--ink)}
.nav.solid .lang i{background:var(--line)}
.nav.solid .nav-cta{color:#fff}

.burger{display:none;width:44px;height:44px;position:relative;z-index:110}
.burger i{
  position:absolute;left:11px;width:22px;height:1.5px;background:#fff;
  transition:transform .3s,opacity .3s,background .3s;
}
.burger i:nth-child(1){top:17px}
.burger i:nth-child(2){top:23px}
.burger i:nth-child(3){top:29px}
.nav.solid .burger i{background:var(--ink)}
.burger.on i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.burger.on i:nth-child(2){opacity:0}
.burger.on i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- 6. Hero ---------- */
.hero{
  position:relative;min-height:clamp(620px,100svh,960px);
  display:flex;flex-direction:column;justify-content:flex-end;
  background:var(--ink);color:#fff;overflow:hidden;padding-top:120px;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background-image:var(--noise);
  background-size:300px;opacity:.16;mix-blend-mode:overlay;pointer-events:none;
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(120% 80% at 78% 12%,rgba(169,124,63,.20),transparent 58%),
    radial-gradient(90% 70% at 8% 92%,rgba(169,124,63,.08),transparent 60%),
    linear-gradient(180deg,rgba(14,14,13,.55) 0%,rgba(14,14,13,0) 34%,rgba(14,14,13,.82) 100%);
}
.hero-lines{
  position:absolute;inset:0;pointer-events:none;opacity:.35;
  background-image:linear-gradient(90deg,rgba(255,255,255,.10) 1px,transparent 1px);
  background-size:calc(100% / 6) 100%;
  mask-image:linear-gradient(180deg,transparent,#000 30%,#000 70%,transparent);
}
.hero-inner{position:relative;z-index:2;width:100%}
.hero-copy{max-width:840px;padding-block:40px}
.hero .eyebrow{color:var(--brass-lt)}
.hero .eyebrow::before{background:var(--brass-lt)}
.hero h1{
  font-size:clamp(38px,7.4vw,88px);font-weight:300;line-height:1.02;
  letter-spacing:-.03em;margin:22px 0 24px;
}
.hero h1 em{font-style:italic;color:var(--brass-lt)}
.hero-sub{
  font-size:clamp(15px,1.8vw,18px);color:rgba(255,255,255,.76);
  max-width:52ch;line-height:1.65;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}

.hero-stats{
  position:relative;z-index:2;border-top:1px solid rgba(255,255,255,.16);
  display:grid;grid-template-columns:repeat(4,1fr);width:100%;
}
.hero-stats li{
  padding:26px 0 30px;border-right:1px solid rgba(255,255,255,.1);
}
.hero-stats li:last-child{border-right:0}
.hero-stats b{
  display:block;font-family:var(--ff-display);font-size:clamp(24px,3vw,34px);
  font-weight:400;color:#fff;line-height:1;letter-spacing:-.02em;
}
.hero-stats b i{font-style:normal;color:var(--brass-lt);font-size:.62em;margin-left:2px}
.hero-stats span{display:block;margin-top:9px;font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:rgba(255,255,255,.55)}
.hero-stats li:not(:first-child){padding-left:clamp(12px,2.4vw,34px)}

/* --- hero stone composition (desktop only) --- */
.hero-art{
  position:absolute;right:8vw;top:11%;width:min(27vw,420px);aspect-ratio:3/4;
  z-index:1;pointer-events:none;display:none;
}
@media (min-width:1200px){.hero-art{display:block}}
.hero-art .pan{
  position:absolute;inset:0;
  box-shadow:0 28px 56px -26px rgba(0,0,0,.8);
  outline:1px solid rgba(255,255,255,.08);outline-offset:-1px;
  transition:transform 1.1s cubic-bezier(.2,.7,.3,1);
}
.hero-art .p1{transform:translate(-40%,7%) rotate(-7deg);opacity:.42;filter:brightness(.72)}
.hero-art .p2{transform:translate(4%,1%) rotate(2.5deg);opacity:.85}
.hero-art .p3{transform:translate(31%,9%) rotate(-3deg) scale(.85)}
/* 中间板换成荒料实拍，首屏就有"源头"的意思 */
.hero-art .photo-blocks{
  background:url('../images/blocks-hero-900.jpg') center/cover no-repeat;
}
/* 前板用实拍板材，首屏直接给真实质感 */
.hero-art .photo-slab{
  background:url('../images/g603-slab-800.jpg') center/cover no-repeat;
  box-shadow:0 40px 80px -30px rgba(0,0,0,.9);
}
.hero:hover .p1{transform:translate(-46%,9%) rotate(-9deg)}
.hero:hover .p2{transform:translate(8%,2%) rotate(4.5deg)}
.hero:hover .p3{transform:translate(31%,7%) rotate(-3deg) scale(.85)}

/* ---------- 7. Sections ---------- */
.section{padding:clamp(64px,9vw,120px) 0;position:relative}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:26px;margin-bottom:clamp(36px,5vw,60px)}
.section-head .h2{margin-top:16px}
.section-head p{max-width:44ch}
.on-dark{background:var(--ink);color:var(--stone)}
.on-dark .h2{color:#fff}
.on-paper{background:var(--stone)}
.on-sand{background:var(--stone-2)}

/* ---------- 8. Marquee strip ---------- */
.strip{background:var(--ink-3);color:#9c968b;border-block:1px solid rgba(255,255,255,.07);overflow:hidden}
.strip-inner{display:flex;gap:0;align-items:center;justify-content:space-between;
  padding-block:18px;flex-wrap:wrap}
.strip span{font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
  display:flex;align-items:center;gap:10px}
.strip span::before{content:"";width:5px;height:5px;background:var(--brass);transform:rotate(45deg)}

/* ---------- 9. About / intro ---------- */
.intro-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(32px,5vw,72px);align-items:center}
.intro-body p+p{margin-top:18px}
.intro-body .h2{margin:16px 0 24px}
.intro-facts{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);margin-top:34px;border:1px solid var(--line)}
.intro-facts div{background:var(--stone);padding:20px 22px}
.intro-facts b{display:block;font-family:var(--ff-display);font-size:22px;color:var(--brass)}
.intro-facts span{font-size:12.5px;color:var(--muted)}

.slab-stack{position:relative;aspect-ratio:4/4.4;min-height:340px}
.slab-stack .slab{position:absolute;inset:0;border-radius:var(--r);overflow:hidden;
  box-shadow:0 24px 60px -20px rgba(0,0,0,.45);transition:transform .6s cubic-bezier(.2,.7,.3,1)}
.slab-stack .slab:nth-child(1){transform:translate(-4%,-5%) rotate(-3deg) scale(.94);opacity:.55;filter:saturate(.55) brightness(.85)}
.slab-stack .slab:nth-child(2){transform:translate(4%,3%) rotate(2deg) scale(.97);opacity:.8}
.slab-stack .slab:nth-child(3){transform:none}
.slab-stack:hover .slab:nth-child(1){transform:translate(-7%,-8%) rotate(-5deg) scale(.94)}
.slab-stack:hover .slab:nth-child(2){transform:translate(7%,5%) rotate(4deg) scale(.97)}
.slab-stack:hover .slab:nth-child(3){transform:translateY(-6px)}
.slab-cap{
  position:absolute;left:0;bottom:-30px;z-index:4;background:var(--ink);color:#fff;
  padding:12px 18px;font-size:11px;letter-spacing:.16em;text-transform:uppercase;
}

/* ---------- 10. Stone textures (procedural) ---------- */
.swatch{position:relative;overflow:hidden;background-color:var(--c,#8d8e8a);isolation:isolate}
/* fine mineral grain */
.swatch::before{
  content:"";position:absolute;inset:-10%;z-index:1;
  background-image:var(--noise);
  background-size:130px 130px;
  mix-blend-mode:overlay;opacity:1;
}
/* macro veining / mottling */
.swatch::after{
  content:"";position:absolute;inset:0;background-image:var(--vein,none);
  background-size:cover;z-index:2;mix-blend-mode:soft-light;
}
/* granite varieties */
.g-grey{--c:#c2c3c6;
  --vein:
    radial-gradient(46% 36% at 22% 16%,rgba(255,255,255,.26),transparent 72%),
    radial-gradient(38% 32% at 74% 64%,rgba(40,42,46,.16),transparent 74%),
    radial-gradient(30% 26% at 48% 90%,rgba(255,255,255,.16),transparent 76%),
    radial-gradient(26% 22% at 88% 24%,rgba(30,32,36,.12),transparent 74%);}
.g-gold{--c:#b28a52;
  --vein:
    radial-gradient(52% 42% at 68% 12%,rgba(255,238,196,.34),transparent 70%),
    radial-gradient(46% 38% at 20% 78%,rgba(88,56,22,.34),transparent 72%),
    radial-gradient(32% 28% at 52% 48%,rgba(255,224,168,.18),transparent 74%),
    radial-gradient(30% 26% at 88% 70%,rgba(120,82,40,.18),transparent 72%);}
.g-black{--c:#202124;
  --vein:
    radial-gradient(48% 38% at 62% 24%,rgba(255,255,255,.16),transparent 70%),
    radial-gradient(42% 36% at 22% 76%,rgba(96,104,116,.45),transparent 72%),
    radial-gradient(28% 24% at 84% 74%,rgba(255,255,255,.07),transparent 74%);}
.g-red{--c:#8a4a41;
  --vein:
    radial-gradient(50% 40% at 28% 22%,rgba(255,192,172,.26),transparent 70%),
    radial-gradient(44% 38% at 76% 74%,rgba(62,24,20,.42),transparent 72%),
    radial-gradient(30% 26% at 52% 58%,rgba(255,214,196,.12),transparent 74%);}
.g-white{--c:#d8d5cc;
  --vein:
    radial-gradient(54% 44% at 26% 18%,rgba(255,255,255,.40),transparent 68%),
    radial-gradient(46% 38% at 78% 78%,rgba(146,142,133,.30),transparent 72%),
    radial-gradient(30% 26% at 56% 50%,rgba(255,255,255,.18),transparent 74%);}
.g-green{--c:#59685a;
  --vein:
    radial-gradient(50% 40% at 30% 20%,rgba(202,226,192,.24),transparent 70%),
    radial-gradient(44% 38% at 78% 80%,rgba(20,34,20,.46),transparent 72%),
    radial-gradient(28% 24% at 54% 54%,rgba(226,240,220,.10),transparent 74%);}
.g-dark{--c:#15151a;
  --vein:
    radial-gradient(60% 50% at 70% 14%,rgba(169,124,63,.26),transparent 68%),
    radial-gradient(48% 42% at 14% 84%,rgba(169,124,63,.12),transparent 72%),
    radial-gradient(34% 30% at 44% 50%,rgba(255,255,255,.04),transparent 74%);}

/* ---------- 11. Products ---------- */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(16px,2vw,26px)}
.prod{
  background:var(--stone);border:1px solid var(--line);
  display:flex;flex-direction:column;transition:transform .4s cubic-bezier(.2,.7,.3,1),box-shadow .4s,border-color .4s;
}
.prod:hover{transform:translateY(-6px);box-shadow:0 26px 50px -26px rgba(0,0,0,.38);border-color:#c3b9a5}
.prod-media{position:relative;aspect-ratio:4/3;overflow:hidden}
.prod-media .swatch{position:absolute;inset:0;transition:transform .8s cubic-bezier(.2,.7,.3,1)}
.prod:hover .prod-media .swatch{transform:scale(1.06)}
.prod-code{
  position:absolute;left:14px;top:14px;z-index:3;background:rgba(14,14,13,.72);
  color:#fff;font-size:10.5px;letter-spacing:.14em;padding:6px 11px;backdrop-filter:blur(4px);
}
.prod-body{padding:22px 22px 24px;display:flex;flex-direction:column;flex:1}
.prod-body h3{font-size:21px;margin-bottom:8px}
.prod-body p{font-size:13.5px;color:var(--muted);line-height:1.6}
.prod-specs{
  display:flex;flex-wrap:wrap;gap:6px 8px;margin:16px 0 18px;
}
.prod-specs li{
  font-size:10.5px;letter-spacing:.07em;text-transform:uppercase;
  border:1px solid var(--line);color:#5f594f;padding:4px 9px;
}
.prod-link{
  margin-top:auto;font-size:12px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;
  color:var(--brass);display:inline-flex;align-items:center;gap:8px;
}
.prod-link svg{width:13px;height:13px;transition:transform .3s}
.prod-link:hover svg{transform:translateX(4px)}

/* ---------- 11b. Material spotlight (real photos) ---------- */
.mat-grid{
  display:grid;grid-template-columns:1.5fr 1fr;gap:clamp(14px,2vw,26px);
  align-items:stretch;
}
.mat-main,.mat-detail{margin:0}
/* 图片框：桌面跟随右栏高度自动拉伸，移动端退回 4:3 */
.mat-main{display:flex;flex-direction:column}
.mat-frame{
  position:relative;flex:1 1 auto;min-height:300px;
  overflow:hidden;background:#dedbd2;
}
.mat-frame img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block;
  transition:transform 1s cubic-bezier(.2,.7,.3,1)}
.mat-main:hover .mat-frame img{transform:scale(1.03)}
.mat-main figcaption{
  margin-top:12px;font-size:12px;line-height:1.6;color:var(--muted);letter-spacing:.01em;
}
.mat-detail{aspect-ratio:1/1;overflow:hidden;background:#dedbd2}
.mat-detail img{width:100%;height:100%;object-fit:cover;display:block;
  transition:transform 1s cubic-bezier(.2,.7,.3,1)}
.mat-detail:hover img{transform:scale(1.03)}
.mat-side{display:flex;flex-direction:column;gap:clamp(14px,2vw,22px)}
.mat-note{font-size:14px;line-height:1.75;color:#4a453d}
.mat-note b{color:var(--ink);font-weight:600}
.mat-specs{border-top:1px solid var(--line);margin-top:auto}
.mat-specs li{
  display:flex;justify-content:space-between;gap:14px;
  padding:10px 0;border-bottom:1px solid var(--line);font-size:12.5px;
}
.mat-specs b{font-weight:600;color:#5f594f;letter-spacing:.06em;text-transform:uppercase;font-size:10.5px}
.mat-specs span{color:var(--ink);text-align:right}

/* ---------- 12. Finishes ---------- */
.finish-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.09)}
.finish{
  background:var(--ink);padding:30px 28px 32px;position:relative;overflow:hidden;
  transition:background .4s;
}
.finish:hover{background:#191917}
.finish-tile{
  width:52px;height:52px;margin-bottom:20px;position:relative;overflow:hidden;
  border:1px solid rgba(255,255,255,.14);
}
.finish h4{font-size:17px;color:#fff;margin-bottom:7px}
.finish p{font-size:12.8px;color:#938d82;line-height:1.6}
.finish-num{
  position:absolute;right:20px;top:22px;font-family:var(--ff-display);
  font-size:32px;color:rgba(255,255,255,.07);line-height:1;
}
/* finish textures */
.t-polished{background:linear-gradient(135deg,#b9b7b0,#7e7d78 42%,#cfcdc6 62%,#8f8e89);}
.t-polished::after{content:"";position:absolute;inset:0;background:linear-gradient(115deg,transparent 40%,rgba(255,255,255,.65) 50%,transparent 58%)}
.t-honed{background:#a5a39d;background-image:var(--noise);background-size:160px;background-blend-mode:multiply}
.t-flamed{background:#8e8c86;background-image:var(--noise-fine);background-size:90px;background-blend-mode:multiply}
.t-bush{background:#9a9891;
  background-image:radial-gradient(circle,rgba(0,0,0,.28) 1.4px,transparent 1.6px);
  background-size:7px 7px}
.t-sand{background:#b3b0a8;
  background-image:radial-gradient(circle,rgba(255,255,255,.5) .8px,transparent 1px);
  background-size:4px 4px}
.t-split{background:#6f6357;
  background-image:linear-gradient(180deg,rgba(255,255,255,.12) 0 22%,transparent 22% 46%,rgba(0,0,0,.22) 46% 58%,transparent 58% 80%,rgba(255,255,255,.08) 80%)}

/* ---------- 13. Applications ---------- */
.app-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:clamp(12px,1.6vw,20px)}
.app{position:relative;overflow:hidden;min-height:240px;display:flex;align-items:flex-end;
  padding:26px;color:#fff}
.app .swatch{position:absolute;inset:0;z-index:0;transition:transform .9s cubic-bezier(.2,.7,.3,1)}
.app:hover .swatch{transform:scale(1.05)}
/* 实拍照片卡片：picture 铺满，img 用 cover 裁切 */
.app picture{position:absolute;inset:0;z-index:0;display:block;overflow:hidden}
.app .card-img{width:100%;height:100%;object-fit:cover;display:block;
  transition:transform .9s cubic-bezier(.2,.7,.3,1)}
.app:hover .card-img{transform:scale(1.05)}
/* 顶部压字的卡片（画面重点在下半部时用，避免文字压住主体） */
.app.cap-top{align-items:flex-start}
.app.cap-top::after{background:linear-gradient(0deg,rgba(10,10,9,.05) 0%,rgba(10,10,9,.28) 45%,rgba(10,10,9,.78) 100%)}
.app::after{content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,rgba(10,10,9,.12) 0%,rgba(10,10,9,.72) 100%)}
.app-txt{position:relative;z-index:2}
.app-txt h4{font-size:20px;margin-bottom:4px}
.app-txt span{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:rgba(255,255,255,.62)}
.app-a{grid-column:span 7;min-height:340px}
.app-b{grid-column:span 5;min-height:340px}
.app-c{grid-column:span 5}
.app-d{grid-column:span 4}
.app-e{grid-column:span 3}
/* factory sub-grid helpers (kept as classes: inline spans break 1-col mobile grids) */
.app-wide{grid-column:span 12}
.app-half{grid-column:span 6}

/* ---------- 14. Factory ---------- */
.factory-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:clamp(32px,5vw,76px);align-items:center}
.cap-list{border-top:1px solid var(--line)}
.cap-list li{
  display:grid;grid-template-columns:auto 1fr auto;gap:18px;align-items:baseline;
  padding:19px 0;border-bottom:1px solid var(--line);
}
.cap-list b{font-family:var(--ff-display);font-size:clamp(20px,2.4vw,27px);color:var(--ink);line-height:1}
.cap-list .k{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.cap-list .d{font-size:12px;color:#8b857a;text-align:right;max-width:16ch}

/* ---------- 15. Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,72px)}
.contact-list{margin-top:32px;display:flex;flex-direction:column;gap:2px}
.contact-list a,.contact-list div{
  display:flex;gap:16px;align-items:flex-start;padding:18px 0;
  border-bottom:1px solid rgba(255,255,255,.1);transition:padding-left .3s,color .3s;
}
.contact-list a:hover{padding-left:6px;color:var(--brass-lt)}
.contact-list .ico{
  width:34px;height:34px;flex:none;border:1px solid rgba(255,255,255,.18);
  display:grid;place-items:center;margin-top:2px;
}
.contact-list .ico svg{width:15px;height:15px;stroke:var(--brass-lt);fill:none;stroke-width:1.5}
.contact-list .lbl{font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:#8b857a;display:block}
.contact-list .val{font-size:15.5px;color:#fff;word-break:break-word}

.form{background:#141412;border:1px solid rgba(255,255,255,.1);padding:clamp(24px,3vw,36px)}
.form h4{font-size:20px;color:#fff;margin-bottom:6px}
.form .note{font-size:12.5px;color:#8b857a;margin-bottom:24px}
.field{margin-bottom:14px}
.field label{display:block;font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:#8b857a;margin-bottom:7px}
.field input,.field select,.field textarea{
  width:100%;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.13);
  color:#fff;padding:13px 15px;font-family:inherit;font-size:14.5px;border-radius:var(--r);
  transition:border-color .25s,background .25s;outline:none;
}
.field input::placeholder,.field textarea::placeholder{color:#6b665d}
.field input:focus,.field select:focus,.field textarea:focus{
  border-color:var(--brass);background:rgba(255,255,255,.07)}
.field select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238b857a' fill='none' stroke-width='1.4'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 15px center}
.field textarea{resize:vertical;min-height:96px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form .btn{width:100%;margin-top:8px}
.form-foot{font-size:11.5px;color:#6b665d;margin-top:14px;text-align:center;line-height:1.5}
.form-ok{
  display:none;margin-top:16px;padding:13px 16px;border:1px solid rgba(37,211,102,.4);
  background:rgba(37,211,102,.08);color:#8fe0ac;font-size:13px;
}
.form-ok.show{display:block}

/* ---------- 16. Footer ---------- */
.footer{background:#0a0a09;color:#7d776d;padding:56px 0 30px;border-top:1px solid rgba(255,255,255,.07)}
.foot-top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:36px;padding-bottom:38px;border-bottom:1px solid rgba(255,255,255,.08)}
.foot-brand{max-width:340px}
.foot-brand .brand{color:#fff}
.foot-brand p{font-size:12.8px;line-height:1.7;margin-top:16px;color:#7d776d}
.foot-cols{display:flex;gap:clamp(32px,6vw,80px);flex-wrap:wrap}
.foot-col h5{font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:#5f5a52;margin-bottom:14px;font-weight:600}
.foot-col a,.foot-col span{display:block;font-size:13px;line-height:2;transition:color .2s}
.foot-col a:hover{color:var(--brass-lt)}
.foot-bot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;padding-top:24px;font-size:11.5px;color:#5f5a52}

/* ---------- 17. Reveal ---------- */
/* 只有「首屏之外」的元素才会被 JS 打上 .pre 隐藏，首屏内容永远不隐藏——
   这样即使 JS 迟到或 IntersectionObserver 不触发，首屏也不会出现空白。 */
.reveal{transition:opacity .8s cubic-bezier(.2,.7,.3,1),transform .8s cubic-bezier(.2,.7,.3,1)}
.reveal.pre{opacity:0;transform:translateY(26px)}
.reveal.pre.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal,.reveal.pre{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}
}

/* ---------- 17.5 Floating WhatsApp ---------- */
.wa-fab{
  position:fixed;right:clamp(14px,2.6vw,28px);bottom:clamp(14px,2.6vw,28px);z-index:90;
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 20px 13px 16px;border-radius:999px;
  background:#25D366;color:#fff!important;
  font-family:var(--ff-body);font-weight:600;font-size:14.5px;letter-spacing:.01em;
  text-decoration:none;white-space:nowrap;
  box-shadow:0 10px 28px rgba(0,0,0,.3),0 2px 8px rgba(0,0,0,.18);
  transition:transform .38s cubic-bezier(.2,.7,.3,1),opacity .3s ease,box-shadow .25s ease;
}
.wa-fab svg{width:22px;height:22px;flex:none}
/* 无 JS 时按钮直接常显；有 JS 则等滚过首屏再滑入 */
html.js .wa-fab{transform:translateY(96px);opacity:0;pointer-events:none}
html.js .wa-fab.show{transform:none;opacity:1;pointer-events:auto}
.wa-fab:hover,.wa-fab:focus-visible{box-shadow:0 14px 34px rgba(37,211,102,.55);background:#2ee06f}
.wa-fab:focus-visible{outline:2px solid #fff;outline-offset:3px}
@media (max-width:640px){
  .wa-fab{padding:15px;border-radius:50%;gap:0}
  .wa-fab span{display:none}
  .wa-fab svg{width:27px;height:27px}
}
@media (prefers-reduced-motion:reduce){
  .wa-fab{transition:none}
}

/* ---------- 18. Responsive ---------- */
@media (max-width:1080px){
  .nav-links{gap:22px}
  .prod-grid{grid-template-columns:repeat(2,1fr)}
  .finish-grid{grid-template-columns:repeat(2,1fr)}
  .app-a{grid-column:span 6}
  .app-b{grid-column:span 6}
  .app-c{grid-column:span 6}
  .app-d{grid-column:span 3}
  .app-e{grid-column:span 3}
}
@media (max-width:900px){
  .intro-grid,.factory-grid,.contact-grid{grid-template-columns:1fr}
  .mat-grid{grid-template-columns:1fr}
  .mat-frame{flex:none;min-height:0;aspect-ratio:4/3}
  .mat-detail{aspect-ratio:4/3}
  .slab-stack{order:-1;aspect-ratio:16/11;min-height:0}
  .slab-stack .slab:nth-child(1){transform:translate(-2%,-5%) rotate(-2.5deg) scale(.9);opacity:.5}
  .slab-stack .slab:nth-child(2){transform:translate(1%,3%) rotate(1.4deg) scale(.95);opacity:.8}
  .slab-cap{bottom:14px;left:14px}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .hero-stats li{padding:22px 0!important;border-right:0;border-bottom:1px solid rgba(255,255,255,.08)}
  .hero-stats li:nth-child(odd){border-right:1px solid rgba(255,255,255,.08)}
  .hero-stats li:nth-last-child(-n+2){border-bottom:0}
  .hero-stats li:nth-child(even){padding-left:clamp(14px,4vw,30px)!important}
  .strip-inner{gap:14px 26px;justify-content:flex-start}
}
@media (max-width:820px){
  .nav-inner{height:64px}
  .burger{display:block}
  .brand{position:relative;z-index:106}
  .nav-right .nav-cta{display:none}
  .nav-links{
    position:fixed;inset:0;z-index:105;flex-direction:column;justify-content:center;
    gap:0;background:rgba(12,12,11,.98);backdrop-filter:blur(16px);
    padding:80px var(--pad) 40px;
    clip-path:circle(0% at calc(100% - 40px) 32px);transition:clip-path .55s cubic-bezier(.6,0,.2,1);
    pointer-events:none;
  }
  .nav-links.open{clip-path:circle(150% at calc(100% - 40px) 32px);pointer-events:auto}
  .nav-links a{
    font-family:var(--ff-display);font-size:26px;color:#fff!important;
    padding:16px 0;border-bottom:1px solid rgba(255,255,255,.1);width:100%;
  }
  .nav-links a::after{display:none}
  .nav-links .m-only{display:flex}
  .lang{position:relative;z-index:110}
}
.m-only{display:none}
@media (max-width:820px){
  .nav-links .m-only{
    margin-top:28px;border:1px solid rgba(255,255,255,.25);color:#fff;
  }
}
@media (max-width:640px){
  .hero{min-height:92svh;padding-top:96px}
  .hero-copy{padding-block:24px 34px}
  .hero-actions .btn{flex:1 1 auto}
  .prod-grid,.finish-grid{grid-template-columns:1fr}
  .app-grid{grid-template-columns:1fr}
  .app,.app-a,.app-b,.app-c,.app-d,.app-e,.app-wide,.app-half{grid-column:span 1;min-height:200px}
  .form-row{grid-template-columns:1fr}
  .intro-facts{grid-template-columns:1fr 1fr}
  .section-head{flex-direction:column;align-items:flex-start}
  .cap-list li{grid-template-columns:auto 1fr;gap:12px}
  .cap-list .d{display:none}
  .foot-top{flex-direction:column}
}