/* ==========================================================================
   纳纤科技 NanoFiber Technology — 官网样式
   调色板取自公司应用场景图中的青绿色调，无外部字体依赖（国内访问友好）
   ========================================================================== */

:root{
  --ink:#0F1A17;
  --ink-soft:#44544F;
  --ink-mute:#788883;

  --teal-900:#0C2C26;
  --teal-800:#123A31;
  --teal-700:#1A5A4D;
  --teal-600:#22705F;
  --teal-500:#2F8571;
  --teal-300:#86B8AC;
  --teal-100:#D9E8E3;
  --teal-50:#EDF4F1;

  --paper:#FCFCFB;
  --mist:#F3F6F4;
  --line:#E4EAE7;
  --line-strong:#CBD8D3;

  --wrap:1200px;
  --gut:clamp(20px,5vw,48px);
  --sec:clamp(64px,9vw,124px);

  --r-sm:4px;
  --r-md:8px;
  --r-lg:16px;

  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB",
         "Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC","WenQuanYi Micro Hei",
         Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-sm:0 1px 2px rgba(15,26,23,.04),0 4px 14px rgba(15,26,23,.05);
  --shadow-md:0 2px 6px rgba(15,26,23,.05),0 18px 44px rgba(15,26,23,.09);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  margin:0;
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  color:var(--ink-soft);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

img,svg,video{max-width:100%;height:auto;display:block}
a{color:var(--teal-600);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--teal-500)}
ul,ol{margin:0;padding:0;list-style:none}

h1,h2,h3,h4{
  margin:0;color:var(--ink);font-weight:700;line-height:1.24;
  letter-spacing:-.005em;
}
h1{font-size:clamp(2.05rem,5.2vw,3.9rem);line-height:1.14}
h2{font-size:clamp(1.65rem,3.5vw,2.7rem);line-height:1.2}
h3{font-size:clamp(1.12rem,1.7vw,1.4rem)}
p{margin:0 0 1.1em;text-wrap:pretty}
p:last-child{margin-bottom:0}

::selection{background:var(--teal-100);color:var(--teal-900)}

:focus-visible{
  outline:2px solid var(--teal-500);
  outline-offset:3px;
  border-radius:2px;
}

/* --- 语言切换：默认中文，切到英文时互换显隐 ------------------------------ */
[data-en]{}
.lang-en [data-zh-only]{display:none !important}
[data-en-only]{display:none}
.lang-en [data-en-only]{display:initial}

/* --------------------------------------------------------------- 布局 --- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gut)}
.section{padding-block:var(--sec)}
.section--mist{background:var(--mist)}
.section--tight{padding-block:clamp(48px,6vw,80px)}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  margin:0 0 18px;
  font-size:.75rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;
  color:var(--teal-600);
}
.eyebrow::before{
  content:"";width:26px;height:1px;background:var(--teal-300);flex:none;
}
.section-head{max-width:780px;margin-bottom:clamp(34px,4.5vw,60px)}
.section-head .lede{margin-top:16px;max-width:660px;font-size:clamp(1rem,1.35vw,1.12rem);color:var(--ink-soft)}
.section-head--center{margin-inline:auto;text-align:center}
.section-head--center .eyebrow{justify-content:center}

.lede{font-size:clamp(1.02rem,1.5vw,1.2rem);line-height:1.72;text-wrap:pretty}

/* --------------------------------------------------------------- 按钮 --- */
.btn{
  --btn-bg:var(--teal-700);--btn-fg:#fff;--btn-bd:var(--teal-700);
  display:inline-flex;align-items:center;justify-content:center;gap:.6em;
  padding:.86em 1.7em;
  border:1px solid var(--btn-bd);border-radius:var(--r-sm);
  background:var(--btn-bg);color:var(--btn-fg);
  font:inherit;font-size:.95rem;font-weight:600;line-height:1.2;
  cursor:pointer;white-space:nowrap;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),
             background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
}
.btn:hover{--btn-bg:var(--teal-600);--btn-bd:var(--teal-600);color:#fff;
  transform:translateY(-2px);box-shadow:0 10px 26px rgba(26,90,77,.26)}
.btn:active{transform:translateY(0)}
.btn--ghost{--btn-bg:transparent;--btn-fg:var(--ink);--btn-bd:var(--line-strong)}
.btn--ghost:hover{--btn-bg:transparent;--btn-bd:var(--teal-500);color:var(--teal-600);
  box-shadow:none}
.btn--onDark{--btn-bg:#fff;--btn-fg:var(--teal-900);--btn-bd:#fff}
.btn--onDark:hover{--btn-bg:var(--teal-50);--btn-bd:var(--teal-50);color:var(--teal-900)}
.btn--ghostOnDark{--btn-bg:transparent;--btn-fg:#fff;--btn-bd:rgba(255,255,255,.42)}
.btn--ghostOnDark:hover{--btn-bg:rgba(255,255,255,.1);--btn-bd:#fff;color:#fff;box-shadow:none}
.btn .arw{transition:transform .22s var(--ease)}
.btn:hover .arw{transform:translateX(4px)}

.textlink{
  display:inline-flex;align-items:center;gap:.5em;
  font-weight:600;font-size:.95rem;color:var(--teal-600);
}
.textlink .arw{transition:transform .22s var(--ease)}
.textlink:hover .arw{transform:translateX(4px)}

/* --------------------------------------------------------------- 页头 --- */
.hdr{
  position:fixed;inset:0 0 auto;z-index:100;
  background:rgba(252,252,251,0);
  border-bottom:1px solid transparent;
  transition:background .3s var(--ease),border-color .3s var(--ease),
             box-shadow .3s var(--ease),backdrop-filter .3s var(--ease);
}
.hdr__in{display:flex;align-items:center;gap:clamp(16px,3vw,44px);height:76px}
.hdr.is-stuck,.hdr.is-open,body:not(.has-darkHero) .hdr{
  background:rgba(252,252,251,.88);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom-color:var(--line);
}
.hdr.is-stuck{box-shadow:0 1px 20px rgba(15,26,23,.05)}

.brand{display:flex;align-items:center;gap:11px;flex:none}
.brand__mark{width:26px;height:26px;flex:none}
.brand__word{height:19px;width:auto}
.brand__cn{
  font-size:.94rem;font-weight:700;color:var(--ink);letter-spacing:.04em;
  padding-left:11px;border-left:1px solid var(--line-strong);line-height:1;
}
/* 深色 hero 上、未滚动时用反白 logo */
body.has-darkHero .hdr:not(.is-stuck):not(.is-open) .brand__mark,
body.has-darkHero .hdr:not(.is-stuck):not(.is-open) .brand__word{filter:brightness(0) invert(1)}
body.has-darkHero .hdr:not(.is-stuck):not(.is-open) .brand__cn{color:#fff;border-left-color:rgba(255,255,255,.32)}
body.has-darkHero .hdr:not(.is-stuck):not(.is-open) .nav__a{color:rgba(255,255,255,.86)}
body.has-darkHero .hdr:not(.is-stuck):not(.is-open) .nav__a:hover,
body.has-darkHero .hdr:not(.is-stuck):not(.is-open) .nav__a.is-active{color:#fff}
body.has-darkHero .hdr:not(.is-stuck):not(.is-open) .langbtn{color:rgba(255,255,255,.86);border-color:rgba(255,255,255,.34)}
body.has-darkHero .hdr:not(.is-stuck):not(.is-open) .langbtn:hover{color:#fff;border-color:#fff}
body.has-darkHero .hdr:not(.is-stuck):not(.is-open) .burger span{background:#fff}

.nav{display:flex;align-items:center;gap:clamp(4px,1.6vw,10px);margin-left:auto}
.nav__a{
  position:relative;padding:8px 12px;border-radius:var(--r-sm);
  font-size:.94rem;font-weight:500;color:var(--ink-soft);white-space:nowrap;
}
.nav__a:hover,.nav__a.is-active{color:var(--ink)}
.nav__a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:1.5px;
  background:var(--teal-500);transform:scaleX(0);transform-origin:left;
  transition:transform .26s var(--ease);
}
.nav__a:hover::after,.nav__a.is-active::after{transform:scaleX(1)}

.hdr__end{display:flex;align-items:center;gap:12px;flex:none}
.langbtn{
  display:inline-flex;align-items:center;gap:5px;
  padding:6px 12px;border:1px solid var(--line-strong);border-radius:100px;
  background:none;font:inherit;font-size:.78rem;font-weight:700;letter-spacing:.05em;
  color:var(--ink-soft);cursor:pointer;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.langbtn:hover{color:var(--teal-600);border-color:var(--teal-500)}
.langbtn__on{color:var(--teal-600)}
body.has-darkHero .hdr:not(.is-stuck):not(.is-open) .langbtn__on{color:#fff}
.langbtn__sep{opacity:.4;font-weight:400}

.burger{
  display:none;width:44px;height:44px;padding:0;margin-right:-10px;
  border:0;background:none;cursor:pointer;
}
.burger span{
  display:block;width:20px;height:1.6px;margin:0 auto;background:var(--ink);
  border-radius:2px;transition:transform .3s var(--ease),opacity .2s var(--ease);
}
.burger span+span{margin-top:5px}
.hdr.is-open .burger span:nth-child(1){transform:translateY(6.6px) rotate(45deg)}
.hdr.is-open .burger span:nth-child(2){opacity:0}
.hdr.is-open .burger span:nth-child(3){transform:translateY(-6.6px) rotate(-45deg)}

@media (max-width:900px){
  .burger{display:block;order:3}
  .hdr__in{height:64px}
  .hdr__end{margin-left:auto;gap:6px}
  .nav{
    position:fixed;inset:64px 0 auto;flex-direction:column;align-items:stretch;
    gap:0;margin:0;padding:12px var(--gut) 26px;
    background:var(--paper);border-bottom:1px solid var(--line);
    box-shadow:0 20px 40px rgba(15,26,23,.08);
    transform:translateY(-8px);opacity:0;visibility:hidden;pointer-events:none;
    transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s;
    max-height:calc(100dvh - 64px);overflow-y:auto;
  }
  .hdr.is-open .nav{opacity:1;transform:none;visibility:visible;pointer-events:auto}
  .nav__a{padding:13px 2px;font-size:1.02rem;border-bottom:1px solid var(--line)}
  .nav__a::after{display:none}
  .brand__cn{display:none}
}

/* --------------------------------------------------------------- HERO --- */
.hero{
  position:relative;isolation:isolate;
  min-height:clamp(560px,92svh,860px);
  display:flex;align-items:center;
  padding-block:150px 90px;
  background:
    radial-gradient(120% 90% at 78% 12%,rgba(47,133,113,.30),transparent 58%),
    radial-gradient(90% 70% at 8% 96%,rgba(12,44,38,.85),transparent 62%),
    linear-gradient(168deg,#0B2721 0%,#0C2C26 44%,#123A31 100%);
  color:#fff;overflow:hidden;
}
.hero__canvas{
  /* canvas 是替换元素：width:auto 会取自身 bitmap 的固有尺寸，inset:0 拉不开它，
     必须显式给 100%，否则画布宽度会被 JS 设的 width 属性反过来锁死 */
  position:absolute;inset:0;width:100%;height:100%;z-index:-1;opacity:.85;
  -webkit-mask-image:radial-gradient(135% 125% at 78% 22%,#000 0%,rgba(0,0,0,.72) 48%,transparent 96%);
  mask-image:radial-gradient(135% 125% at 78% 22%,#000 0%,rgba(0,0,0,.72) 48%,transparent 96%);
}
.hero::after{
  content:"";position:absolute;inset:auto 0 0;height:34%;z-index:-1;
  background:linear-gradient(to top,rgba(11,39,33,.92),transparent);
}
.hero__in{position:relative;max-width:960px}
.hero .eyebrow{color:var(--teal-300)}
.hero .eyebrow::before{background:rgba(134,184,172,.6)}
.hero h1{color:#fff;max-width:15em;text-wrap:balance}
.hero__lede{
  margin-top:26px;max-width:680px;
  font-size:clamp(1.02rem,1.6vw,1.24rem);line-height:1.75;
  color:rgba(255,255,255,.8);
}
.hero__cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:38px}
.hero__scroll{
  position:absolute;left:var(--gut);bottom:34px;
  display:flex;align-items:center;gap:10px;
  font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;
  color:rgba(255,255,255,.5);
}
.hero__scroll i{
  display:block;width:1px;height:34px;background:linear-gradient(rgba(255,255,255,.55),transparent);
  animation:drop 2.1s var(--ease) infinite;
}
@keyframes drop{0%{transform:scaleY(0);transform-origin:top}
  45%{transform:scaleY(1);transform-origin:top}
  55%{transform:scaleY(1);transform-origin:bottom}
  100%{transform:scaleY(0);transform-origin:bottom}}
@media (max-width:640px){.hero__scroll{display:none}}

/* 内页页眉 */
.phead{
  position:relative;padding-block:clamp(122px,15vw,178px) clamp(40px,5vw,64px);
  background:linear-gradient(180deg,var(--teal-50),var(--paper));
  border-bottom:1px solid var(--line);overflow:hidden;
}
.phead::before{
  content:"";position:absolute;top:-40%;right:-6%;width:min(560px,62vw);aspect-ratio:1;
  background:radial-gradient(circle,rgba(47,133,113,.11),transparent 66%);
}
.phead__in{position:relative;max-width:820px}
.phead .lede{margin-top:18px;max-width:660px}
.crumb{
  display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:16px;
  font-size:.82rem;color:var(--ink-mute);
}
.crumb a{color:var(--ink-mute)}
.crumb a:hover{color:var(--teal-600)}
.crumb span{opacity:.5}

/* ------------------------------------------------------------- 资质条 --- */
.creds{border-block:1px solid var(--line);background:var(--paper)}
.creds__in{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:1px;background:var(--line);
}
.cred{
  padding:clamp(24px,3vw,34px) clamp(18px,2.2vw,28px);background:var(--paper);
}
/* 平板宽度下 auto-fit 会排成 3+1，右边空一大块，强制两行两列 */
@media (min-width:641px) and (max-width:900px){
  .creds__in{grid-template-columns:repeat(2,1fr)}
}
.cred__k{
  display:block;font-size:clamp(1.5rem,2.6vw,2rem);font-weight:700;color:var(--teal-700);
  line-height:1.1;letter-spacing:-.02em;
}
.cred__t{display:block;margin-top:9px;font-size:.92rem;font-weight:600;color:var(--ink)}
.cred__d{display:block;margin-top:3px;font-size:.82rem;color:var(--ink-mute);line-height:1.6}

/* --------------------------------------------------------------- 卡片 --- */
.grid{display:grid;gap:clamp(18px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(min(100%,440px),1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(min(100%,290px),1fr))}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr))}

.card{
  position:relative;display:flex;flex-direction:column;
  padding:clamp(24px,2.8vw,34px);
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--line-strong)}
.card__n{
  font:600 .74rem/1 var(--mono);letter-spacing:.14em;color:var(--teal-500);margin-bottom:16px;
}
.card h3{margin-bottom:10px}
.card p{font-size:.95rem;color:var(--ink-soft)}
.card__ic{width:30px;height:30px;margin-bottom:18px;color:var(--teal-600)}

/* 价值主张 */
.value{padding:0;border:0;background:none}
.value:hover{transform:none;box-shadow:none}
.value__bar{width:34px;height:2px;background:var(--teal-500);margin-bottom:20px}

/* 产品卡 */
.pcard{
  display:flex;flex-direction:column;overflow:hidden;
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.pcard:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--line-strong)}
.pcard__fig{
  position:relative;aspect-ratio:4/3;overflow:hidden;background:var(--mist);
  border-bottom:1px solid var(--line);
}
.pcard__fig img{width:100%;height:100%;object-fit:cover;
  transition:transform .6s var(--ease)}
.pcard:hover .pcard__fig img{transform:scale(1.04)}
.pcard__fig--art{background:linear-gradient(158deg,var(--teal-50),#F8FBFA 68%)}
.pcard__no{
  position:absolute;top:14px;left:14px;z-index:1;
  padding:4px 10px;border-radius:100px;
  background:rgba(252,252,251,.92);
  font:700 .72rem/1.5 var(--mono);letter-spacing:.1em;color:var(--teal-700);
}
.pcard__b{padding:clamp(22px,2.4vw,30px);display:flex;flex-direction:column;flex:1}
.pcard h3{min-height:2.48em}
.pcard__en{
  display:block;margin-top:6px;
  font-size:.8rem;font-weight:600;letter-spacing:.03em;color:var(--ink-mute);
}
.pcard p{margin-top:14px;font-size:.94rem}
.pcard .textlink{margin-top:auto;padding-top:20px}

/* 应用场景卡（线稿插画） */
.acard{
  display:flex;flex-direction:column;overflow:hidden;
  background:linear-gradient(180deg,#fff,var(--mist));
  border:1px solid var(--line);border-radius:var(--r-md);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.acard:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--teal-300)}
.acard__fig{
  display:grid;place-items:center;padding:22px 22px 6px;aspect-ratio:16/10;overflow:hidden;
}
/* 插画原始比例不一，必须撑满固定比例的框再 contain，否则会把卡片顶高、行内错位 */
.acard__fig img{width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply}
.acard__b{padding:6px clamp(22px,2.4vw,28px) clamp(24px,2.6vw,30px)}
.acard h3{font-size:1.08rem;margin-bottom:8px}
.acard p{font-size:.92rem;color:var(--ink-soft);margin:0}

/* ----------------------------------------------------------- 工艺流程 --- */
.flow{
  display:grid;gap:14px;
  grid-template-columns:repeat(auto-fit,minmax(min(100%,180px),1fr));
  counter-reset:step;
}
.step{
  position:relative;padding:26px 22px 24px;
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);
  counter-increment:step;
}
.step::before{
  content:"0" counter(step);
  display:block;margin-bottom:14px;
  font:700 .78rem/1 var(--mono);letter-spacing:.12em;color:var(--teal-300);
}
.step::after{
  content:"";position:absolute;top:50%;right:-14px;z-index:1;
  width:14px;height:1px;background:var(--line-strong);
}
.step:last-child::after{display:none}
.step h3{font-size:1rem;margin-bottom:7px}
.step p{font-size:.88rem;line-height:1.66;color:var(--ink-mute);margin:0}
@media (max-width:760px){.step::after{display:none}}

/* --------------------------------------------------------- 图文分栏 --- */
.split{
  display:grid;gap:clamp(30px,5vw,72px);align-items:center;
  grid-template-columns:repeat(auto-fit,minmax(min(100%,330px),1fr));
}
.split__fig{position:relative}
.split__fig img{
  width:100%;border-radius:var(--r-md);border:1px solid var(--line);
  box-shadow:var(--shadow-sm);
}
.split__fig--prod img{aspect-ratio:4/3;object-fit:cover}
.split__fig figcaption{
  margin-top:14px;font-size:.84rem;color:var(--ink-mute);line-height:1.6;
}
.split--flip .split__body{order:2}

/* 要点清单 */
.ticks{margin-top:22px;display:grid;gap:13px}
.ticks li{
  position:relative;padding-left:30px;font-size:.96rem;color:var(--ink-soft);line-height:1.66;
}
.ticks li::before{
  content:"";position:absolute;left:0;top:.55em;
  width:15px;height:8px;border-left:1.8px solid var(--teal-500);
  border-bottom:1.8px solid var(--teal-500);transform:rotate(-45deg);
}
.ticks strong{color:var(--ink);font-weight:600}

/* 规格表 */
.spec{width:100%;border-collapse:collapse;margin-top:24px;font-size:.93rem}
.spec th,.spec td{padding:13px 4px;text-align:left;border-bottom:1px solid var(--line)}
.spec th{width:38%;font-weight:600;color:var(--ink);white-space:nowrap}
.spec td{color:var(--ink-soft)}
.spec tr:last-child th,.spec tr:last-child td{border-bottom:0}

/* 标签 */
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.tag{
  padding:5px 12px;border:1px solid var(--teal-100);border-radius:100px;
  background:var(--teal-50);font-size:.8rem;font-weight:600;color:var(--teal-700);
}

/* ------------------------------------------------------------- 大事记 --- */
.time{position:relative;margin-top:8px;padding-left:26px}
.time::before{
  content:"";position:absolute;left:4px;top:6px;bottom:6px;width:1px;background:var(--line-strong);
}
.time li{position:relative;padding-bottom:34px}
.time li:last-child{padding-bottom:0}
.time li::before{
  content:"";position:absolute;left:-26px;top:7px;width:9px;height:9px;
  border-radius:50%;background:var(--paper);border:2px solid var(--teal-500);
}
.time__y{font:700 .82rem/1 var(--mono);letter-spacing:.08em;color:var(--teal-600)}
.time h3{margin:9px 0 6px;font-size:1.05rem}
.time p{font-size:.93rem;margin:0}

/* --------------------------------------------------------------- CTA --- */
.cta{
  position:relative;isolation:isolate;overflow:hidden;
  padding-block:clamp(60px,8vw,104px);
  background:linear-gradient(150deg,#0C2C26,#1A5A4D 130%);color:#fff;
}
.cta::before{
  content:"";position:absolute;inset:-30% -10% auto auto;width:min(640px,74vw);aspect-ratio:1;
  z-index:-1;background:radial-gradient(circle,rgba(134,184,172,.2),transparent 66%);
}
.cta h2{color:#fff;max-width:16em}
.cta p{margin-top:16px;max-width:580px;color:rgba(255,255,255,.78)}
.cta__row{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}

/* --------------------------------------------------------------- 联系 --- */
.contact{display:grid;gap:clamp(34px,5vw,68px);
  grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr))}
.cinfo{display:grid;gap:26px;margin-top:6px}
.cinfo__i{display:flex;gap:16px}
.cinfo__ic{
  flex:none;width:38px;height:38px;display:grid;place-items:center;
  border-radius:var(--r-sm);background:var(--teal-50);color:var(--teal-600);
}
.cinfo__ic svg{width:18px;height:18px}
.cinfo dt{font-size:.78rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--ink-mute);margin-bottom:4px}
.cinfo dd{margin:0;font-size:1rem;color:var(--ink);font-weight:500;line-height:1.6}
.cinfo dd a{color:var(--ink)}
.cinfo dd a:hover{color:var(--teal-600)}
.cinfo__note{font-size:.86rem;color:var(--ink-mute);font-weight:400;margin-top:2px}

.form{
  padding:clamp(26px,3vw,38px);
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);
  box-shadow:var(--shadow-sm);
}
.field{margin-bottom:18px}
.field label{
  display:block;margin-bottom:7px;font-size:.86rem;font-weight:600;color:var(--ink);
}
.field .req{color:#B4453C;margin-left:2px}
.field input,.field textarea,.field select{
  width:100%;padding:12px 14px;
  font:inherit;font-size:.95rem;color:var(--ink);
  background:var(--paper);border:1px solid var(--line-strong);border-radius:var(--r-sm);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.field input:focus,.field textarea:focus,.field select:focus{
  outline:0;border-color:var(--teal-500);box-shadow:0 0 0 3px rgba(47,133,113,.13);
}
.field textarea{resize:vertical;min-height:132px;line-height:1.65}
.field select{
  appearance:none;cursor:pointer;padding-right:38px;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5 6 6.5l5-5' fill='none' stroke='%23788883' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;background-size:11px;
}
.form .btn{width:100%;margin-top:6px}
.form__note{margin-top:14px;font-size:.82rem;color:var(--ink-mute);line-height:1.6}
.form__msg{
  margin-top:16px;padding:12px 14px;border-radius:var(--r-sm);
  font-size:.9rem;line-height:1.6;display:none;
}
.form__msg.is-ok{display:block;background:var(--teal-50);color:var(--teal-700);
  border:1px solid var(--teal-100)}
.form__msg.is-err{display:block;background:#FCF1F0;color:#9E3A32;border:1px solid #F2D9D6}

/* --------------------------------------------------------------- 页脚 --- */
.ftr{background:var(--teal-900);color:rgba(255,255,255,.62);font-size:.9rem}
.ftr a{color:rgba(255,255,255,.62)}
.ftr a:hover{color:#fff}
.ftr__top{
  display:grid;gap:clamp(30px,4vw,54px);padding-block:clamp(48px,6vw,74px);
  /* min() 包一层，否则窄屏上 230px/140px 的下限会撑破视口造成横向滚动 */
  grid-template-columns:minmax(min(230px,100%),1.5fr) repeat(auto-fit,minmax(min(140px,100%),1fr));
}
@media (max-width:760px){
  .ftr__top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ftr__brand{grid-column:1/-1}
}
@media (max-width:400px){
  .ftr__top{grid-template-columns:minmax(0,1fr);gap:30px}
}
.ftr__brand .brand__mark,.ftr__brand .brand__word{filter:brightness(0) invert(1)}
.ftr__brand .brand__cn{color:#fff;border-left-color:rgba(255,255,255,.28)}
.ftr__desc{margin-top:20px;max-width:330px;line-height:1.75;font-size:.88rem}
.ftr h4{
  color:#fff;font-size:.78rem;font-weight:700;letter-spacing:.13em;text-transform:uppercase;
  margin-bottom:16px;
}
.ftr__list{display:grid;gap:11px}
.ftr__list a{font-size:.9rem}
.ftr__bot{
  display:flex;flex-wrap:wrap;gap:10px 26px;align-items:center;
  padding-block:22px;border-top:1px solid rgba(255,255,255,.11);
  font-size:.82rem;color:rgba(255,255,255,.44);
}
.ftr__bot p{margin:0}
.ftr__bot .sp{margin-left:auto}
@media (max-width:640px){.ftr__bot .sp{margin-left:0}}

/* ----------------------------------------------------------- 滚动动效 --- */
.rv{opacity:0;transform:translateY(18px);
  transition:opacity .7s var(--ease),transform .7s var(--ease)}
.rv.is-in{opacity:1;transform:none}
.rv-d1{transition-delay:.07s}
.rv-d2{transition-delay:.14s}
.rv-d3{transition-delay:.21s}
.rv-d4{transition-delay:.28s}
@media (prefers-reduced-motion:reduce){
  .rv{opacity:1;transform:none;transition:none}
  .hero__scroll i{animation:none}
  *{scroll-behavior:auto !important}
}

/* ------------------------------------------------------------- 404 --- */
.nf{display:grid;place-items:center;text-align:center;min-height:70svh;padding-block:120px 80px}
.nf__code{font:700 clamp(4rem,14vw,9rem)/1 var(--mono);color:var(--teal-100);letter-spacing:-.04em}
.nf h1{margin-top:8px}
.nf p{margin-top:14px;max-width:430px}
.nf .btn{margin-top:28px}

.skip{
  position:absolute;left:-9999px;top:0;z-index:200;
  padding:12px 20px;background:var(--teal-700);color:#fff;border-radius:0 0 var(--r-sm) 0;
}
.skip:focus{left:0;color:#fff}

@media print{
  .hdr,.ftr,.hero__canvas,.cta,.burger{display:none}
  body{color:#000}
  .rv{opacity:1;transform:none}
}