/* ==========================================================================
   镇江合彩材料科技有限公司 — 静态官网样式
   Design system: light industrial / cool-blue, Chinese-first typography
   ========================================================================== */
:root{
  --ink:#101a19;
  --ink-2:#162321;
  --ink-3:#22332f;
  --paper:#f5f8f7;
  --paper-2:#e8efee;
  --white:#ffffff;
  --muted:#5b6b68;
  --muted-2:#849290;
  --line:rgba(16,26,25,.12);
  --line-2:rgba(16,26,25,.07);
  --line-dark:rgba(255,255,255,.14);
  --brand:#0f766e;
  --brand-2:#115e59;
  --brand-soft:#e0f2f0;
  --brand-ink:#073b36;
  --teal:#14b8a6;
  --amber:#0d9488;
  --violet:#0f766e;
  --rose:#115e59;
  --radius-xs:.5rem;
  --radius-sm:.85rem;
  --radius:1.15rem;
  --radius-lg:1.75rem;
  --radius-xl:2.5rem;
  --shadow-sm:0 2px 10px rgba(16,26,25,.06);
  --shadow:0 20px 50px -22px rgba(16,26,25,.35);
  --shadow-lg:0 40px 90px -40px rgba(16,26,25,.5);
  --container:min(100% - 2.5rem,1240px);
  --container-narrow:min(100% - 2.5rem,920px);
  --header-h:92px;
  --ease:cubic-bezier(.22,.61,.36,1);
  color-scheme:light;
}

*,*::before,*::after{box-sizing:border-box;}

html{
  overflow-x:hidden;
  overflow-x:clip;
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 1.25rem);
}

body{
  margin:0;
  min-width:320px;
  overflow-x:hidden;
  overflow-x:clip;
  background:var(--paper);
  color:var(--ink);
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:16px;
  line-height:1.7;
  font-feature-settings:"kern" 1;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
body.nav-open{overflow:hidden;}

img,svg,video{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button,input,textarea,select{font:inherit;color:inherit;}
button,a{touch-action:manipulation;-webkit-tap-highlight-color:transparent;}

::selection{background:var(--brand);color:#fff;}

:focus-visible{outline:3px solid var(--brand);outline-offset:3px;border-radius:4px;}

.skip-link{
  position:fixed;top:.85rem;left:.85rem;z-index:200;
  transform:translateY(-180%);
  background:var(--brand);color:#fff;
  padding:.7rem 1.1rem;border-radius:999px;font-weight:700;font-size:.9rem;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0);}

/* ---------- Layout ---------- */
.container{width:var(--container);margin-inline:auto;}
.container-narrow{width:var(--container-narrow);margin-inline:auto;}
.section{padding:clamp(4rem,7vw,7.5rem) 0;}
.section-sm{padding:clamp(2.75rem,5vw,4.5rem) 0;}
.section-tight{padding:clamp(3rem,5vw,5rem) 0;}
.section-paper{background:var(--paper);}
.section-white{background:var(--white);}
.section-dark{background:var(--ink);color:#fff;}
.section-dark-2{background:linear-gradient(160deg,var(--ink) 0%,var(--ink-2) 55%,#123a34 100%);color:#fff;}

/* ---------- Typography ---------- */
h1,h2,h3,h4,h5{margin:0;font-weight:800;line-height:1.14;letter-spacing:-.01em;}
h1{font-size:clamp(2.35rem,4.6vw,4.1rem);line-height:1.08;}
h2{font-size:clamp(1.85rem,3.4vw,3rem);line-height:1.12;}
h3{font-size:clamp(1.2rem,1.9vw,1.6rem);}
h4{font-size:1.08rem;}
p{margin:0;}
.lede{font-size:clamp(1.02rem,1.5vw,1.2rem);line-height:1.75;}

.eyebrow{
  display:inline-flex;align-items:center;gap:.7rem;
  margin:0 0 1.1rem;
  color:var(--brand);font-size:.82rem;font-weight:800;
  letter-spacing:.06em;line-height:1.2;
}
.eyebrow::before{content:"";width:1.6rem;height:2px;background:currentColor;border-radius:2px;}
.section-dark .eyebrow{color:rgba(255,255,255,.66);}

.section-head{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(1.5rem,4vw,4rem);align-items:end;margin-bottom:clamp(2.25rem,4vw,3.75rem);}
.section-head p{color:var(--muted);}
.section-dark .section-head p{color:rgba(255,255,255,.68);}
.section-head-centered{grid-template-columns:1fr;text-align:center;justify-items:center;max-width:44rem;margin-inline:auto;}
.section-head-centered .eyebrow{justify-content:center;}

.muted{color:var(--muted);}
.accent{color:var(--brand);}
.kicker{font-size:.8rem;font-weight:800;letter-spacing:.14em;color:var(--muted-2);text-transform:uppercase;}

/* ---------- Buttons ---------- */
.button{
  display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
  padding:.95rem 1.5rem;border-radius:999px;
  font-size:.96rem;font-weight:700;line-height:1;
  border:1.5px solid transparent;cursor:pointer;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
  white-space:nowrap;
}
.button:hover{transform:translateY(-2px);}
.button:active{transform:translateY(0);}
.button svg{width:1.05em;height:1.05em;}
.button-primary{background:var(--brand);color:#fff;box-shadow:0 12px 26px -12px rgba(16,26,25,.75);}
.button-primary:hover{background:var(--brand-2);box-shadow:0 18px 34px -14px rgba(16,26,25,.8);}
.button-dark{background:var(--ink);color:#fff;}
.button-dark:hover{background:var(--ink-3);}
.button-light{background:#fff;color:var(--ink);border-color:var(--line);}
.button-light:hover{border-color:var(--brand);color:var(--brand);}
.button-ghost{background:transparent;color:#fff;border-color:var(--line-dark);}
.button-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08);}
.button-outline{background:transparent;color:var(--brand);border-color:rgba(16,26,25,.35);}
.button-outline:hover{background:var(--brand-soft);border-color:var(--brand);}
.button-sm{padding:.7rem 1.15rem;font-size:.88rem;}
.button-lg{padding:1.1rem 1.85rem;font-size:1.02rem;}

.text-link{display:inline-flex;align-items:center;gap:.4rem;color:var(--brand);font-weight:700;font-size:.92rem;}
.text-link svg{width:1em;height:1em;transition:transform .2s var(--ease);}
.text-link:hover svg{transform:translateX(3px);}

/* ---------- Announcement ---------- */
.announcement{background:var(--ink);color:rgba(255,255,255,.82);font-size:.83rem;}
.announcement .container{display:flex;flex-wrap:wrap;gap:.4rem 1.25rem;align-items:center;justify-content:space-between;min-height:40px;padding-block:.35rem;}
.announcement a{color:#ffffff;font-weight:600;}
.announcement a:hover{color:#fff;}
.announcement .dot{width:6px;height:6px;border-radius:50%;background:#849290;display:inline-block;margin-right:.5rem;vertical-align:middle;}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:120;
  background:rgba(255,255,255,.92);
  border-bottom:1px solid var(--line-2);
}
.site-header .container{display:flex;align-items:center;gap:1.25rem;min-height:var(--header-h);}
.brand{display:flex;align-items:center;gap:1.05rem;flex-shrink:0;}
.brand-logo{height:64px;width:auto;display:block;}
.brand-mark{width:60px;height:60px;flex-shrink:0;}
.brand-copy{display:flex;flex-direction:column;line-height:1.2;}
.brand-name{font-size:1.53rem;font-weight:800;letter-spacing:.01em;}
.brand-tag{font-size:1.05rem;color:var(--muted-2);letter-spacing:.1em;}

.site-nav{margin-left:auto;display:flex;align-items:center;gap:.2rem;}
.site-nav a{
  position:relative;padding:.55rem .8rem;border-radius:.6rem;font-size:.95rem;font-weight:600;color:var(--ink-3);
  transition:color .18s var(--ease),background .18s var(--ease);
}
.site-nav a:hover{color:var(--brand);background:var(--brand-soft);}
.site-nav a[aria-current="page"]{color:var(--brand);}
.site-nav a[aria-current="page"]::after{content:"";position:absolute;left:.8rem;right:.8rem;bottom:.15rem;height:2px;background:var(--brand);border-radius:2px;}

.header-actions{display:flex;align-items:center;gap:.65rem;margin-left:.5rem;}
.header-phone{display:inline-flex;align-items:center;gap:.45rem;font-weight:800;font-size:.95rem;color:var(--ink);}
.header-phone svg{width:1.05rem;height:1.05rem;color:var(--brand);}
.header-phone:hover{color:var(--brand);}

.menu-toggle{display:none;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:.7rem;cursor:pointer;padding:0;align-items:center;justify-content:center;flex-direction:column;gap:5px;}
.menu-toggle span{display:block;width:20px;height:2px;background:var(--ink);border-radius:2px;transition:transform .2s var(--ease),opacity .2s var(--ease);}
.menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#f0f1f2 0%,var(--paper) 100%);}
.hero-home{padding:clamp(3.25rem,6vw,6rem) 0 clamp(3.5rem,6vw,6rem);}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(2rem,5vw,4.5rem);align-items:center;}
.hero-copy h1{margin-bottom:1.4rem;}
.hero-home h1{font-size:clamp(1.7rem,3.55vw,3.45rem);text-wrap:balance;}
.hero-copy .lede{color:var(--muted);max-width:34rem;margin-bottom:2rem;}
.hero-actions{display:flex;flex-wrap:wrap;gap:.85rem;margin-bottom:2rem;}
.hero-meta{display:flex;flex-wrap:wrap;gap:.4rem 1.4rem;color:var(--muted);font-size:.9rem;font-weight:600;}
.hero-meta span{display:inline-flex;align-items:center;gap:.45rem;}
.hero-meta span::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);}
.text-brand{color:var(--brand);}

.hero-visual{position:relative;aspect-ratio:4/3;min-height:300px;border-radius:var(--radius-xl);overflow:hidden;box-shadow:var(--shadow-lg);background:var(--paper-2);}
.hero-photo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:58% 55%;}
.hero-panel{
  position:absolute;inset:0;border-radius:var(--radius-xl);
  background:
    radial-gradient(120% 120% at 80% 0%,rgba(16,26,25,.22),transparent 55%),
    linear-gradient(150deg,#101a19 0%,#16302c 60%,#0d5b52 100%);
  box-shadow:var(--shadow-lg);overflow:hidden;
}
.hero-panel::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);
  background-size:44px 44px;mask-image:radial-gradient(120% 90% at 70% 20%,#000,transparent 78%);
  -webkit-mask-image:radial-gradient(120% 90% at 70% 20%,#000,transparent 78%);
}
.sheet-stack{position:absolute;left:8%;right:8%;top:50%;transform:translateY(-50%);display:grid;gap:14px;z-index:2;}
.sheet{
  height:clamp(46px,6vw,74px);border-radius:14px;position:relative;overflow:hidden;
  border:1px solid rgba(255,255,255,.28);
  background:linear-gradient(100deg,rgba(255,255,255,.28),rgba(255,255,255,.05));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.4),0 18px 40px -24px rgba(0,0,0,.7);
  transform:translateX(0);
  transition:transform .5s var(--ease);
}
.sheet::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(255,255,255,.5),transparent 30%);opacity:.5;}
.sheet:nth-child(1){width:88%;background:linear-gradient(100deg,rgba(255,255,255,.30),rgba(255,255,255,.05));}
.sheet:nth-child(2){width:96%;background:linear-gradient(100deg,rgba(255,255,255,.34),rgba(255,255,255,.04));margin-left:4%;}
.sheet:nth-child(3){width:82%;background:linear-gradient(100deg,rgba(255,255,255,.26),rgba(255,255,255,.04));}
.sheet:nth-child(4){width:92%;background:linear-gradient(100deg,rgba(255,255,255,.28),rgba(255,255,255,.05));margin-left:2%;}
.sheet:nth-child(5){width:78%;background:linear-gradient(100deg,rgba(255,255,255,.22),rgba(255,255,255,.04));}
.hero-visual:hover .sheet:nth-child(1){transform:translateX(-10px);}
.hero-visual:hover .sheet:nth-child(2){transform:translateX(12px);}
.hero-visual:hover .sheet:nth-child(3){transform:translateX(-6px);}
.hero-visual:hover .sheet:nth-child(4){transform:translateX(8px);}
.hero-visual:hover .sheet:nth-child(5){transform:translateX(-8px);}

.hero-chip{
  position:absolute;z-index:3;background:#fff;border-radius:.9rem;padding:.7rem .95rem;
  box-shadow:var(--shadow);display:flex;flex-direction:column;gap:.1rem;border:1px solid var(--line-2);
}
.hero-chip strong{font-size:1.05rem;}
.hero-chip span{font-size:.74rem;color:var(--muted);letter-spacing:.02em;}
.chip-1{top:8%;right:6%;}
.chip-2{bottom:9%;left:5%;}
.chip-3{bottom:26%;right:10%;}

/* ---------- Logo strip / capabilities ---------- */
.cap-strip{background:var(--ink);color:#fff;}
.cap-strip .container{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line-dark);}
.cap-strip .item{padding:1.4rem 1rem;display:flex;align-items:center;gap:.7rem;font-weight:700;font-size:.95rem;background:var(--ink);}
.cap-strip .item svg{width:1.35rem;height:1.35rem;color:rgba(255,255,255,.66);flex-shrink:0;}

/* ---------- Material cards ---------- */
.materials-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;}
.material-card{
  position:relative;display:flex;flex-direction:column;overflow:hidden;
  background:#fff;border:1px solid var(--line-2);border-radius:var(--radius-lg);
  box-shadow:var(--shadow-sm);
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),border-color .25s var(--ease);
}
.material-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:color-mix(in srgb,var(--accent) 45%,transparent);}
.material-card-visual{
  position:relative;height:170px;padding:1.1rem 1.35rem;
  background:linear-gradient(150deg,color-mix(in srgb,var(--accent) 88%,#101a19 12%),color-mix(in srgb,var(--accent) 46%,#101a19));
  display:flex;align-items:flex-start;justify-content:space-between;color:#fff;overflow:hidden;
}
.material-card-visual::after{
  content:"";position:absolute;right:-30px;bottom:-40px;width:180px;height:180px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.35),transparent 65%);
}
.material-card-index{font-size:.78rem;font-weight:800;letter-spacing:.14em;opacity:.9;z-index:1;}
.material-card-code{
  z-index:1;font-size:2.6rem;font-weight:800;line-height:1;letter-spacing:-.02em;
  text-shadow:0 6px 24px rgba(0,0,0,.25);
}
.material-card-photo{background:#101a19;}
.material-card-photo img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0;transition:transform .6s var(--ease);}
.material-card:hover .material-card-photo img{transform:scale(1.06);}
.material-card-photo::before{content:"";position:absolute;inset:0;z-index:1;background:linear-gradient(180deg,rgba(16,26,25,.62) 0%,rgba(16,26,25,.18) 55%,rgba(16,26,25,.5) 100%);}
.material-card-photo::after{display:none;}
.material-card-photo .material-card-index,.material-card-photo .material-card-code{position:relative;z-index:2;}
.material-card-body{padding:1.4rem 1.45rem 1.55rem;display:flex;flex-direction:column;gap:.7rem;flex:1;}
.material-card-body h3{display:flex;align-items:baseline;gap:.5rem;}
.material-card-body h3 small{font-size:.82rem;font-weight:700;color:var(--muted-2);letter-spacing:.04em;}
.material-card-body p{color:var(--muted);font-size:.95rem;flex:1;}
.material-card .text-link{margin-top:.35rem;color:var(--ink);}

/* ---------- Tag / chip ---------- */
.chips{display:flex;flex-wrap:wrap;gap:.5rem;}
.chip{
  display:inline-flex;align-items:center;padding:.38rem .8rem;border-radius:999px;
  background:var(--paper-2);color:var(--ink-3);font-size:.82rem;font-weight:600;border:1px solid var(--line-2);
}
.chip-accent{background:color-mix(in srgb,var(--accent) 12%,#fff);color:color-mix(in srgb,var(--accent) 82%,#000 6%);border-color:color-mix(in srgb,var(--accent) 30%,transparent);}

/* ---------- Application grid ---------- */
.app-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;}
.app-card{
  position:relative;cursor:pointer;
  background:#fff;border:1px solid var(--line-2);border-radius:var(--radius);padding:1.3rem 1.25rem;
  display:flex;flex-direction:column;gap:.85rem;
  transition:transform .28s var(--ease),box-shadow .28s var(--ease),border-color .28s var(--ease);
}
.app-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(15,118,110,.35);}
.app-card.is-zoomed{transform:translateY(-6px) scale(1.07);box-shadow:0 34px 64px -30px rgba(16,26,25,.5);border-color:rgba(15,118,110,.5);z-index:8;}
.app-card.is-zoomed .app-thumb{box-shadow:0 12px 26px -14px rgba(16,26,25,.5);}
.app-icon{width:56px;height:56px;border-radius:.85rem;background:var(--brand-soft);color:var(--brand);display:flex;align-items:center;justify-content:center;flex-shrink:0;overflow:hidden;}
.app-icon svg{width:28px;height:28px;}
.app-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:.9rem;}
.app-thumb{width:186px;aspect-ratio:4/3;height:auto;flex:0 1 auto;max-width:calc(100% - 72px);cursor:zoom-in;border-radius:.7rem;overflow:hidden;background:var(--paper-2);border:1px solid var(--line-2);}
.app-thumb img{width:100%;height:100%;object-fit:cover;display:block;}
.app-icon svg{width:28px;height:28px;}
.app-card h4{font-size:1.02rem;}
.app-card p{font-size:.86rem;color:var(--muted);line-height:1.6;}
.app-card .app-tags{margin-top:auto;display:flex;flex-wrap:wrap;gap:.35rem;font-size:.72rem;color:var(--muted-2);}
.app-card .app-tags span{background:var(--paper);border-radius:.4rem;padding:.18rem .5rem;font-weight:600;}

/* ---------- Feature / why-us ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.25rem;}
.feature{
  padding:1.6rem 1.4rem;border-radius:var(--radius);background:#fff;border:1px solid var(--line-2);
  display:flex;flex-direction:column;gap:.7rem;
}
.feature .num{font-size:.8rem;font-weight:800;color:var(--brand);letter-spacing:.12em;}
.feature h4{font-size:1.06rem;}
.feature p{font-size:.9rem;color:var(--muted);}
.section-dark .feature{background:rgba(255,255,255,.05);border-color:var(--line-dark);}
.section-dark .feature p{color:rgba(255,255,255,.65);}
.section-dark .feature .num{color:rgba(255,255,255,.66);}

/* ---------- Process (capability) cards with photo ---------- */
.proc-card{padding:0;gap:0;overflow:hidden;}
.proc-media{aspect-ratio:4/3;background:var(--brand-soft);overflow:hidden;border-bottom:1px solid var(--line-2);display:flex;align-items:center;justify-content:center;}
.proc-media img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .55s var(--ease);}
.proc-card:hover .proc-media img{transform:scale(1.045);}
.proc-media.is-icon .app-icon{width:76px;height:76px;border-radius:1rem;}
.proc-media.is-icon .app-icon svg{width:36px;height:36px;}
.proc-card h4{padding:1.15rem 1.3rem 0;}
.proc-card p{padding:.5rem 1.3rem 1.35rem;}
.proc-media{cursor:zoom-in;}
.proc-media.is-icon{cursor:default;}
.proc-media:focus-visible{outline:3px solid var(--brand);outline-offset:3px;}

/* ---------- Why-us cards with photo (top-right thumb) ---------- */
.why-card{padding:1.35rem 1.3rem 1.45rem;gap:.7rem;}
.why-top{display:flex;align-items:flex-start;justify-content:space-between;gap:.8rem;min-height:8.6rem;}
.why-thumb{flex:0 0 auto;height:8.6rem;aspect-ratio:4/3;border-radius:.7rem;overflow:hidden;border:1px solid var(--line-2);background:#fff;cursor:zoom-in;}
.why-thumb img{width:100%;height:100%;object-fit:contain;display:block;}
.why-thumb:focus-visible{outline:3px solid var(--brand);outline-offset:3px;}
.hero-photo{cursor:zoom-in;}
.hero-photo:focus-visible{outline:3px solid var(--brand);outline-offset:3px;}

/* ---------- Stats ---------- */
.stat-band{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem;}
.stat{border-left:2px solid rgba(255,255,255,.2);padding-left:1.25rem;}
.stat strong{display:block;font-size:clamp(1.9rem,3.4vw,2.8rem);font-weight:800;letter-spacing:-.02em;}
.stat span{color:rgba(255,255,255,.62);font-size:.9rem;}

/* ---------- Process / steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:1.25rem;counter-reset:step;}
.step{position:relative;padding-top:1.4rem;border-top:2px solid var(--line);}
.step::before{
  counter-increment:step;content:counter(step,decimal-leading-zero);
  position:absolute;top:-.95rem;left:0;background:var(--paper);padding-right:.75rem;
  font-weight:800;color:var(--brand);font-size:1rem;letter-spacing:.05em;
}
.step h4{margin-bottom:.5rem;}
.step p{font-size:.9rem;color:var(--muted);}

/* ---------- FAQ ---------- */
.faq{display:grid;gap:.85rem;max-width:60rem;margin-inline:auto;}
.faq details{background:#fff;border:1px solid var(--line-2);border-radius:var(--radius);overflow:hidden;}
.faq details[open]{border-color:rgba(16,26,25,.3);box-shadow:var(--shadow-sm);}
.faq summary{
  list-style:none;cursor:pointer;padding:1.15rem 1.35rem;font-weight:700;font-size:1rem;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:"";width:.7rem;height:.7rem;border-right:2px solid var(--brand);border-bottom:2px solid var(--brand);transform:rotate(45deg);transition:transform .2s var(--ease);flex-shrink:0;}
.faq details[open] summary::after{transform:rotate(-135deg);}
.faq .faq-body{padding:0 1.35rem 1.3rem;color:var(--muted);font-size:.94rem;}

/* ---------- Spec table ---------- */
.spec-table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);}
.spec-table caption{text-align:left;font-weight:800;font-size:.85rem;color:var(--muted-2);letter-spacing:.08em;padding:0 0 .75rem;}
.spec-table th,.spec-table td{text-align:left;padding:1rem 1.25rem;border-bottom:1px solid var(--line-2);font-size:.95rem;vertical-align:top;}
.spec-table th{background:var(--paper);font-weight:700;color:var(--ink);width:34%;}
.spec-table td{color:var(--muted);}
.spec-table tr:last-child th,.spec-table tr:last-child td{border-bottom:0;}

/* ---------- Material page hero ---------- */
.material-hero{position:relative;overflow:hidden;background:linear-gradient(160deg,#101a19,#16302c 60%,#123a34);color:#fff;padding:clamp(3rem,6vw,5.5rem) 0;}
.material-hero::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(90% 120% at 88% 6%,color-mix(in srgb,var(--accent) 55%,transparent),transparent 60%);
  pointer-events:none;
}
.material-hero .container{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(2rem,5vw,4rem);align-items:center;}
.material-hero h1{color:#fff;margin-bottom:1.1rem;}
.material-hero .lede{color:rgba(255,255,255,.82);max-width:36rem;margin-bottom:1.9rem;}
.material-hero .eyebrow{color:color-mix(in srgb,var(--accent) 70%,#fff 30%);}
.breadcrumb{display:flex;gap:.5rem;align-items:center;font-size:.83rem;color:rgba(255,255,255,.6);margin-bottom:1.5rem;}
.breadcrumb a:hover{color:#fff;}
.hero-specs{display:grid;grid-template-columns:repeat(2,1fr);gap:.9rem;}
.hero-spec{background:rgba(255,255,255,.07);border:1px solid var(--line-dark);border-radius:var(--radius);padding:1.1rem 1.15rem;}
.hero-spec span{display:block;font-size:.76rem;color:rgba(255,255,255,.6);letter-spacing:.04em;margin-bottom:.35rem;}
.hero-spec strong{font-size:1.05rem;font-weight:700;}

/* ---------- CTA band ---------- */
.cta-band{position:relative;overflow:hidden;border-radius:var(--radius-xl);background:linear-gradient(150deg,#101a19,#0f4a43 70%,#0d5b52);color:#fff;padding:clamp(2.5rem,5vw,4rem);}
.cta-band::after{content:"";position:absolute;right:-60px;top:-60px;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.16),transparent 65%);}
.cta-band-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.4fr auto;gap:2rem;align-items:center;}
.cta-band h2{color:#fff;margin-bottom:.7rem;}
.cta-band p{color:rgba(255,255,255,.75);max-width:38rem;}
.cta-band .cta-actions{display:flex;flex-wrap:wrap;gap:.85rem;}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:clamp(2rem,5vw,4rem);align-items:start;}
.contact-list{display:grid;gap:1rem;margin-top:1.75rem;}
.contact-item{display:flex;gap:1rem;align-items:flex-start;background:#fff;border:1px solid var(--line-2);border-radius:var(--radius);padding:1.15rem 1.25rem;}
.contact-item .ci-icon{width:44px;height:44px;border-radius:.8rem;background:var(--brand-soft);color:var(--brand);display:flex;align-items:center;justify-content:center;flex-shrink:0;}
.contact-item .ci-icon svg{width:22px;height:22px;}
.contact-item span{display:block;font-size:.78rem;color:var(--muted-2);letter-spacing:.04em;}
.contact-item strong{font-size:1.05rem;font-weight:700;word-break:break-word;}
.contact-item a:hover strong{color:var(--brand);}
a.contact-item{transition:border-color .2s var(--ease),box-shadow .2s var(--ease);}
a.contact-item:hover{border-color:rgba(15,118,110,.45);box-shadow:var(--shadow-sm);}
a.contact-item:hover strong{color:var(--brand);}
.contact-item .ci-sub{display:block;margin-top:.25rem;font-size:.82rem;font-style:normal;font-weight:700;color:var(--brand);}
.contact-item .ci-note{margin-left:.3rem;font-size:inherit;font-style:normal;font-weight:600;color:var(--brand);white-space:nowrap;}
.footer-note{font-size:.86em;color:var(--muted-2);}
.announcement .note-wechat{font-style:normal;font-size:.92em;opacity:.9;white-space:nowrap;}
.footer-contact a:hover{color:var(--brand);}
.footer-bottom a{color:inherit;text-decoration:underline;text-underline-offset:2px;}
.footer-bottom a:hover{color:var(--brand);}

/* ---------- 语言切换 ---------- */
.lang-switch{display:inline-flex;align-items:center;border:1px solid var(--line-2);border-radius:999px;overflow:hidden;background:#fff;font-size:.8rem;font-weight:700;flex-shrink:0;}
.lang-switch a,.lang-switch span{padding:.36rem .68rem;color:var(--muted);text-decoration:none;line-height:1;}
.lang-switch .is-active{background:var(--brand);color:#fff;}
.lang-switch a:hover{color:var(--brand);background:var(--brand-soft);}
.header-phone span{white-space:nowrap;}
@media (max-width:600px){.lang-switch{font-size:.74rem;}.lang-switch a,.lang-switch span{padding:.3rem .55rem;}}

.contact-form{background:#fff;border:1px solid var(--line-2);border-radius:var(--radius-lg);padding:clamp(1.5rem,3vw,2.25rem);box-shadow:var(--shadow-sm);}
.form-row{display:grid;gap:.5rem;margin-bottom:1rem;}
.form-row label{font-size:.85rem;font-weight:700;color:var(--ink-3);}
.form-row input,.form-row textarea,.form-row select{
  width:100%;padding:.8rem .95rem;border:1.5px solid var(--line);border-radius:.7rem;background:var(--paper);
  transition:border-color .18s var(--ease),background .18s var(--ease);
}
.form-row input:focus,.form-row textarea:focus,.form-row select:focus{border-color:var(--brand);background:#fff;outline:none;}
.form-row textarea{resize:vertical;min-height:110px;}
.form-grid-2{display:grid;grid-template-columns:1fr 1fr;gap:1rem;}
.form-note{font-size:.78rem;color:var(--muted-2);margin-top:.85rem;}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.7);padding:clamp(3rem,5vw,4.5rem) 0 1.5rem;font-size:.92rem;}
.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:2rem;padding-bottom:2.5rem;border-bottom:1px solid var(--line-dark);}
.footer-brand{display:flex;gap:.7rem;align-items:center;margin-bottom:1rem;color:#fff;}
.footer-brand img{height:54px;width:auto;}
.footer-brand strong{font-size:1.05rem;line-height:1.25;}
.site-footer h4{color:#fff;font-size:.95rem;margin-bottom:1rem;letter-spacing:.02em;}
.footer-links{display:flex;flex-direction:column;gap:.6rem;}
.footer-links a:hover{color:#fff;}
.footer-contact p{margin-bottom:.55rem;display:flex;gap:.5rem;}
.footer-contact svg{width:1.05rem;height:1.05rem;color:rgba(255,255,255,.66);flex-shrink:0;margin-top:.28rem;}
.footer-bottom{display:flex;flex-wrap:wrap;gap:.6rem 1.5rem;justify-content:space-between;padding-top:1.5rem;font-size:.82rem;color:rgba(255,255,255,.5);}

/* ---------- Reveal animation ---------- */
.reveal{opacity:1;}
html.js .reveal{opacity:0;translate:0 22px;transition:opacity .7s var(--ease),translate .7s var(--ease);}
html.js .reveal.is-visible{opacity:1;translate:0 0;}

/* ---------- Back to top ---------- */
.to-top{
  position:fixed;right:1.25rem;bottom:1.25rem;z-index:100;
  width:48px;height:48px;border-radius:50%;border:none;background:var(--brand);color:#fff;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  box-shadow:0 14px 30px -12px rgba(16,26,25,.8);
  opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity .25s var(--ease),transform .25s var(--ease),visibility .25s;
}
.to-top.show{opacity:1;visibility:visible;transform:none;}
.to-top svg{width:20px;height:20px;}


/* ---------- 产品图放大（灯箱） ---------- */
.lightbox{position:fixed;inset:0;z-index:300;display:flex;align-items:center;justify-content:center;padding:clamp(1rem,4vw,2rem);background:rgba(16,26,25,.74);opacity:0;visibility:hidden;transition:opacity .25s var(--ease),visibility .25s;}
.lightbox.is-open{opacity:1;visibility:visible;}
.lightbox-inner{margin:0;background:#fff;border-radius:1rem;overflow:hidden;box-shadow:0 40px 90px -30px rgba(0,0,0,.6);max-width:min(92vw,880px);max-height:88vh;display:flex;flex-direction:column;transform:scale(.95);transition:transform .3s var(--ease);}
.lightbox.is-open .lightbox-inner{transform:scale(1);}
.lightbox-inner img{width:100%;height:auto;max-height:74vh;object-fit:contain;background:#f5f8f7;display:block;}
.lightbox-inner figcaption{padding:.85rem 1.15rem;font-weight:700;font-size:.95rem;color:var(--ink);border-top:1px solid var(--line-2);}
.lightbox-close{position:absolute;top:clamp(.75rem,3vw,1.25rem);right:clamp(.75rem,3vw,1.25rem);width:46px;height:46px;border-radius:50%;border:none;background:#fff;color:var(--ink);font-size:1.6rem;line-height:1;cursor:pointer;box-shadow:0 10px 26px -12px rgba(0,0,0,.55);transition:background .2s var(--ease),color .2s var(--ease);}
.lightbox-close:hover{background:var(--brand);color:#fff;}
body.lightbox-open{overflow:hidden;}

/* ---------- Utility ---------- */
.stack-lg>*+*{margin-top:clamp(2rem,4vw,3.5rem);}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1.5rem,4vw,3rem);}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem;}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;}

/* ---------- Responsive ---------- */
@media (min-width:961px){
  .site-header{backdrop-filter:saturate(160%) blur(14px);-webkit-backdrop-filter:saturate(160%) blur(14px);}
}
@media (max-width:1080px){
  .app-grid{grid-template-columns:repeat(3,1fr);}
  .feature-grid{grid-template-columns:repeat(2,1fr);}
  .stat-band{grid-template-columns:repeat(2,1fr);gap:1.75rem 1.5rem;}
  .footer-top{grid-template-columns:1fr 1fr;gap:2rem 2.5rem;}
}
@media (max-width:960px){
  .hero-inner,.material-hero .container,.contact-grid,.grid-2{grid-template-columns:1fr;}
  .hero-visual{min-height:300px;order:-1;}
  .section-head{grid-template-columns:1fr;gap:1rem;}
  .materials-grid{grid-template-columns:1fr;}
  .material-card{flex-direction:row;}
  .material-card-visual{width:34%;height:auto;min-height:160px;flex-direction:column;justify-content:space-between;}
  .material-card-body{width:66%;}
  .cap-strip .container{grid-template-columns:repeat(2,1fr);}
  .header-phone{display:none;}
  .site-nav{
    position:fixed;inset:0 0 0 auto;width:min(86vw,360px);flex-direction:column;align-items:stretch;gap:.15rem;
    background:#fff;padding:calc(var(--header-h) + 1.5rem) 1.5rem 2rem;margin:0;
    box-shadow:-30px 0 60px -30px rgba(0,0,0,.4);
    transform:translateX(105%);transition:transform .3s var(--ease);overflow-y:auto;
  }
  body.nav-open .site-nav{transform:translateX(0);}
  .site-nav a{padding:.9rem .75rem;font-size:1.05rem;border-radius:.7rem;}
  .site-nav a[aria-current="page"]::after{display:none;}
  .menu-toggle{display:flex;}
  .header-actions .button{display:none;}
  .nav-backdrop{position:fixed;inset:0;background:rgba(16,26,25,.45);z-index:119;opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s;}
  body.nav-open .nav-backdrop{opacity:1;visibility:visible;}
}
@media (max-width:720px){
  :root{--container:min(100% - 1.75rem,1240px);--container-narrow:min(100% - 1.75rem,920px);}
  .app-grid{grid-template-columns:repeat(2,1fr);}
  .steps{grid-template-columns:repeat(2,1fr);gap:1.5rem 1.25rem;}
  .form-grid-2{grid-template-columns:1fr;}
  .cta-band-inner{grid-template-columns:1fr;}
  .material-card{flex-direction:column;}
  .material-card-visual{width:100%;height:170px;min-height:0;flex-direction:row;}
  .material-card-body{width:100%;}
  .hero-specs{grid-template-columns:1fr;}
  .footer-top{grid-template-columns:1fr;}
}
@media (max-width:460px){
  .app-grid,.feature-grid,.cap-strip .container,.stat-band,.steps{grid-template-columns:1fr;}
  .brand-tag{display:none;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important;}
  .reveal{opacity:1;translate:none;}
}

/* ============================================================
   清爽亮色主题覆盖（浅色大气 · 青绿点缀）
   ============================================================ */
.hero{background:linear-gradient(180deg,#eaf6f4 0%,var(--paper) 100%);}
.hero-panel{
  background:
    radial-gradient(120% 120% at 80% 0%,rgba(20,184,166,.18),transparent 55%),
    linear-gradient(150deg,#eaf6f4 0%,#f3faf9 55%,#e0f2f0 100%);
  border:1px solid var(--line-2);
  box-shadow:0 30px 70px -42px rgba(16,26,25,.38);
}
.hero-panel::after{
  background-image:linear-gradient(rgba(15,118,110,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(15,118,110,.07) 1px,transparent 1px);
}
.sheet{border-color:rgba(15,118,110,.18);box-shadow:0 10px 26px -18px rgba(16,26,25,.5),inset 0 1px 0 rgba(255,255,255,.8);}
.sheet::after{background:linear-gradient(100deg,rgba(255,255,255,.85),transparent 45%);}
.sheet:nth-child(1){background:linear-gradient(100deg,rgba(20,184,166,.36),rgba(20,184,166,.08));}
.sheet:nth-child(2){background:linear-gradient(100deg,rgba(255,255,255,.95),rgba(255,255,255,.55));}
.sheet:nth-child(3){background:linear-gradient(100deg,rgba(13,148,136,.32),rgba(13,148,136,.07));}
.sheet:nth-child(4){background:linear-gradient(100deg,rgba(15,118,110,.26),rgba(15,118,110,.06));}
.sheet:nth-child(5){background:linear-gradient(100deg,rgba(94,234,212,.5),rgba(94,234,212,.12));}

.cap-strip{background:#fff;border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2);color:var(--ink);}
.cap-strip .container{background:var(--line-2);}
.cap-strip .item{background:#fff;color:var(--ink);}
.cap-strip .item svg{color:var(--brand);}

.section-dark{background:linear-gradient(180deg,#f0f9f8,#f8fbfa);color:var(--ink);}
.section-dark .eyebrow{color:var(--brand);}
.section-dark p{color:var(--muted);}
.section-dark .feature{background:#fff;border-color:var(--line-2);box-shadow:var(--shadow-sm);}
.section-dark .feature p{color:var(--muted);}
.section-dark .feature .num{color:var(--brand);}
.section-dark h2{color:var(--ink)!important;}
.stat{border-left:2px solid rgba(15,118,110,.28);}
.stat strong{color:var(--ink);}
.stat span{color:var(--muted);}

.cta-band{background:linear-gradient(140deg,#12a594,#0f766e);color:#fff;}
.cta-band::after{background:radial-gradient(circle,rgba(94,234,212,.38),transparent 65%);}
.cta-band p{color:rgba(255,255,255,.88);}

.site-footer{background:#eef5f4;color:var(--muted);}
.site-footer h4{color:var(--ink);}
.footer-top{border-bottom-color:rgba(16,26,25,.1);}
.footer-brand{color:var(--ink);}
.footer-contact svg{color:var(--brand);}
.footer-links a:hover{color:var(--brand);}
.footer-bottom{color:var(--muted-2);}

.announcement{background:var(--brand);color:rgba(255,255,255,.92);}
.announcement a{color:#fff;}
.announcement .dot{background:#5eead4;}

.material-hero{background:linear-gradient(160deg,#eaf6f4,#f6fbfa);color:var(--ink);}
.material-hero h1{color:var(--ink);}
.material-hero .lede{color:var(--muted);}
.material-hero .eyebrow{color:var(--brand);}
.breadcrumb{color:var(--muted-2);}
.breadcrumb a:hover{color:var(--brand);}
.hero-spec{background:#fff;border-color:var(--line-2);box-shadow:var(--shadow-sm);}
.hero-spec span{color:var(--muted-2);}
.hero-spec strong{color:var(--ink);}