/* ==========================================================================
   宁夏富杨食品 · 网站样式 v2
   设计语言：蓝白工业档案
   骨架：12 栏网格 + 1px 细线 + 等宽标注 + 直角；主色白 / 深海军蓝 / 低饱和青
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  /* 深色（页头、深色区块、页脚） */
  --navy:       #0D4566;
  --navy-2:     #11527A;
  --navy-3:     #17608C;

  /* 亮色 */
  --white:      #FFFFFF;
  --tint:       #EFF7FA;   /* 浅天青，用于交替区块 */
  --tint-2:     #E1EFF5;
  --tint-3:     #C9DFE8;

  /* 深底文字 */
  --on-d:       #EDF4F6;
  --on-d-2:     rgba(255,255,255,.80);
  --on-d-3:     rgba(255,255,255,.58);

  /* 亮底文字 */
  --tx:         #0B3049;
  --tx-2:       #47626F;
  --tx-3:       #7F97A3;

  --line:       rgba(13,69,102,.16);
  --line-2:     rgba(13,69,102,.08);
  --line-d:     rgba(237,244,246,.16);
  --line-d-2:   rgba(237,244,246,.08);

  /* 强调色：低饱和蒂芙尼青，别太骚 */
  --teal:       #0A8083;
  --teal-2:     #076467;
  --teal-lt:    #6FD6D0;
  --teal-hi:    #14B4AF;

  --sans: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono: "SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --wrap: 1440px;
  --pad: clamp(20px,4.2vw,68px);
  --nav-h: 72px;

  --ease: cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 基础 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 66px)}
body{
  margin:0;background:var(--white);color:var(--tx);
  font-family:var(--sans);font-size:16px;line-height:1.75;
  font-weight:400;letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--teal);color:#fff}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure{margin:0}
ul,ol{padding:0;list-style:none}

/* 滚动条 */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--tint)}
::-webkit-scrollbar-thumb{background:#C2D2D7;border:2px solid var(--tint)}
::-webkit-scrollbar-thumb:hover{background:#9FB4BB}

/* ---------- 3. 布局 ---------- */
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--pad);position:relative}
.wrap--wide{max-width:none}

.sec{padding:clamp(64px,8vw,132px) 0;position:relative;background:var(--white)}
.sec--paper{background:var(--tint)}          /* 浅青灰交替区块 */
.sec--ink{background:var(--navy);color:var(--on-d)}
.sec--tight{padding-top:clamp(40px,4vw,64px)}

/* 竖向装饰导轨 */
.rail{position:absolute;top:0;bottom:0;left:calc(var(--pad) - 1px);width:1px;background:var(--line);pointer-events:none}
.rail::before,.rail::after{content:"";position:absolute;left:-2px;width:5px;height:5px;background:var(--tint-3)}
.rail::before{top:0}
.rail::after{bottom:0}
.sec--ink .rail{background:var(--line-d)}
.sec--ink .rail::before,.sec--ink .rail::after{background:rgba(237,244,246,.35)}

/* ---------- 4. 排版 ---------- */
.h1{font-size:clamp(38px,5.6vw,86px);line-height:1.02;font-weight:700;letter-spacing:-.035em}
.h2{font-size:clamp(27px,3.1vw,46px);line-height:1.16;font-weight:700;letter-spacing:-.028em}
.h3{font-size:clamp(19px,1.5vw,23px);line-height:1.4;font-weight:600;letter-spacing:-.012em}
.h4{font-size:16px;line-height:1.5;font-weight:600}
.lead{font-size:clamp(15px,1.15vw,17.5px);line-height:1.9;color:var(--tx-2);max-width:62ch}
.body{font-size:15px;line-height:1.95;color:var(--tx-2)}
.small{font-size:13.5px;line-height:1.8}
.dim{color:var(--tx-2)}
.tnum{font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
.sec--ink .lead,.sec--ink .body{color:var(--on-d-2)}
.sec--ink .dim{color:var(--on-d-2)}

/* 上标小标签 */
.eyebrow{
  display:flex;align-items:center;gap:14px;
  font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--tx-3);margin-bottom:26px;
}
.eyebrow b{font-weight:400;color:var(--teal);letter-spacing:.16em}
.eyebrow i{flex:0 0 34px;height:1px;background:currentColor;opacity:.5;font-style:normal}
.eyebrow span{white-space:nowrap}
.sec--ink .eyebrow{color:var(--on-d-3)}
.sec--ink .eyebrow b{color:var(--teal-lt)}

.mono{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase}
.sig{color:var(--teal)}
.sec--ink .sig{color:var(--teal-lt)}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:14px;
  padding:15px 24px;border:1px solid var(--line);
  font-size:14px;letter-spacing:.02em;font-weight:500;color:var(--tx);
  transition:background .28s var(--ease),color .28s var(--ease),border-color .28s var(--ease);
  position:relative;
}
.btn .arw{font-family:var(--mono);transition:transform .3s var(--ease)}
.btn:hover .arw{transform:translateX(4px)}
.btn--solid{background:var(--navy);color:#fff;border-color:var(--navy)}
.btn--solid:hover{background:var(--teal);border-color:var(--teal)}
.btn--sig{background:var(--teal);border-color:var(--teal);color:#fff}
.btn--sig:hover{background:var(--teal-2);border-color:var(--teal-2)}
.btn--ghost:hover{background:rgba(12,42,56,.05)}
.sec--ink .btn{border-color:var(--line-d);color:var(--on-d)}
.sec--ink .btn--ghost:hover{background:rgba(237,244,246,.08)}
.sec--ink .btn--solid{background:var(--on-d);color:var(--navy);border-color:var(--on-d)}
.sec--ink .btn--solid:hover{background:var(--teal-lt);border-color:var(--teal-lt);color:var(--navy)}
.sec--ink .btn--sig{background:var(--teal-lt);border-color:var(--teal-lt);color:var(--navy)}
.sec--ink .btn--sig:hover{background:#7FD0C8;border-color:#7FD0C8}

.link-arw{
  display:inline-flex;align-items:center;gap:10px;font-size:13.5px;
  border-bottom:1px solid var(--line);padding-bottom:4px;
  transition:border-color .3s,gap .3s,color .3s;
}
.link-arw:hover{border-color:var(--teal);gap:16px;color:var(--teal)}
.sec--ink .link-arw{border-color:var(--line-d)}
.sec--ink .link-arw:hover{color:var(--teal-lt);border-color:var(--teal-lt)}

/* ---------- 6. 导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--nav-h);
  background:var(--navy);
  border-bottom:1px solid rgba(255,255,255,.10);
  transition:background .4s var(--ease),box-shadow .4s var(--ease);
}
.nav.is-stuck{background:rgba(12,42,56,.94);box-shadow:0 1px 0 rgba(255,255,255,.06)}
.nav__inner{
  max-width:var(--wrap);margin:0 auto;padding:0 var(--pad);
  height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.nav__brand{display:flex;align-items:center;gap:12px}
.nav__brand img{width:34px;height:34px;object-fit:contain;opacity:.96}
.nav__name{display:flex;flex-direction:column;line-height:1.15}
.nav__name b{font-size:15.5px;font-weight:700;letter-spacing:.14em;color:#fff}
.nav__name span{font-family:var(--mono);font-size:8.5px;letter-spacing:.24em;color:rgba(237,244,246,.5);margin-top:3px}
.nav__links{display:flex;align-items:center;gap:clamp(18px,2.1vw,34px)}
.nav__links a{
  font-size:13.5px;color:rgba(237,244,246,.76);position:relative;padding:6px 0;
  transition:color .25s;
}
.nav__links a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--teal-hi);
  transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease);
}
.nav__links a:hover,.nav__links a.on{color:#fff}
.nav__links a:hover::after,.nav__links a.on::after{transform:scaleX(1)}
.nav__right{display:flex;align-items:center;gap:18px}
.nav__tel{font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:rgba(237,244,246,.7)}
.nav__tel:hover{color:#fff}
.nav__burger{display:none;width:40px;height:40px;position:relative}
.nav__burger i{position:absolute;left:9px;right:9px;height:1.5px;background:#fff;transition:transform .3s,opacity .3s}
.nav__burger i:nth-child(1){top:15px}
.nav__burger i:nth-child(2){top:24px}
body.menu-open .nav__burger i:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
body.menu-open .nav__burger i:nth-child(2){transform:translateY(-4.5px) rotate(-45deg)}

.menu{
  position:fixed;inset:0;z-index:99;background:var(--navy);color:var(--on-d);
  padding:calc(var(--nav-h) + 32px) var(--pad) 40px;
  display:flex;flex-direction:column;justify-content:space-between;
  opacity:0;visibility:hidden;transition:opacity .35s var(--ease),visibility .35s;
}
body.menu-open .menu{opacity:1;visibility:visible}
.menu a.m-link{
  display:flex;align-items:baseline;gap:16px;
  padding:18px 0;border-bottom:1px solid var(--line-d-2);
  font-size:26px;font-weight:600;letter-spacing:-.02em;color:var(--on-d);
}
.menu a.m-link em{font-family:var(--mono);font-size:10px;font-style:normal;letter-spacing:.2em;color:var(--on-d-3)}
.menu__foot{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--on-d-3);line-height:2}

/* ---------- 7. 首屏 ---------- */
.hero{
  position:relative;min-height:min(94svh,900px);display:flex;align-items:flex-end;
  padding-bottom:clamp(36px,5vw,64px);overflow:hidden;background:var(--navy);
  color:var(--on-d);
}
.hero__media{position:absolute;inset:0;z-index:0}
.hero__media img{width:100%;height:100%;object-fit:cover;object-position:56% 46%;
  filter:saturate(1.04) contrast(1.06) brightness(.98);transform:scale(1.04);
  animation:heroIn 2.4s var(--ease) forwards}
@keyframes heroIn{to{transform:scale(1)}}
.hero__media::after{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(180deg,rgba(9,48,72,.84) 0%,rgba(9,48,72,.14) 30%,rgba(9,48,72,.40) 78%,var(--navy) 100%),
    linear-gradient(90deg,rgba(9,48,72,.90) 0%,rgba(9,48,72,.58) 34%,rgba(9,48,72,.04) 70%,rgba(9,48,72,.26) 100%);
}
.hero__grid{
  position:absolute;inset:0;z-index:1;pointer-events:none;
  max-width:var(--wrap);margin:0 auto;padding:0 var(--pad);
}
.hero__grid i{position:absolute;top:0;bottom:0;width:1px;background:rgba(237,244,246,.07)}
.hero__body{position:relative;z-index:2;width:100%}
.hero__kicker{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:rgba(237,244,246,.7);
  margin-bottom:clamp(22px,3vw,40px);
}
.hero__kicker .dot{width:5px;height:5px;background:var(--teal-hi);border-radius:50%}
.hero h1{font-size:clamp(44px,6.6vw,104px);margin-bottom:clamp(20px,2.4vw,30px);color:#fff}
.hero h1 .num{display:block;font-variant-numeric:tabular-nums;letter-spacing:-.05em}
.hero__sub{max-width:60ch;font-size:clamp(14.5px,1.15vw,17px);line-height:1.9;color:rgba(237,244,246,.78)}
.hero__acts{display:flex;flex-wrap:wrap;gap:12px;margin-top:clamp(26px,3vw,40px)}
.hero .btn{border-color:rgba(255,255,255,.42);color:#fff}
.hero .btn--ghost{background:rgba(255,255,255,.06)}
.hero .btn--ghost:hover{background:rgba(255,255,255,.13)}
.hero .btn--solid{background:#fff;color:var(--navy);border-color:#fff}
.hero .btn--solid:hover{background:var(--teal-lt);border-color:var(--teal-lt);color:var(--navy)}
.hero__foot{
  display:flex;justify-content:space-between;align-items:flex-end;gap:24px;
  margin-top:clamp(40px,6vw,80px);padding-top:22px;border-top:1px solid var(--line-d);
}
.hero__facts{display:flex;gap:clamp(20px,3vw,54px);flex-wrap:wrap}
.hero__fact b{display:block;font-size:15px;font-weight:600;letter-spacing:-.01em;color:#fff}
.hero__fact span{font-family:var(--mono);font-size:10px;letter-spacing:.18em;color:rgba(237,244,246,.5)}
.hero__scroll{font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:rgba(237,244,246,.5);display:flex;align-items:center;gap:10px}
.hero__scroll i{display:block;width:1px;height:34px;background:linear-gradient(180deg,var(--teal-lt),transparent);animation:drop 2s infinite}
@keyframes drop{0%{opacity:0;transform:scaleY(.2)}50%{opacity:1}100%{opacity:0;transform:scaleY(1)}}

/* ---------- 8. 数据带 ---------- */
.band{background:var(--white);border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2)}
.band__grid{display:grid;grid-template-columns:repeat(6,1fr)}
.band__item{padding:clamp(26px,3vw,42px) clamp(14px,1.6vw,26px);border-right:1px solid var(--line-2)}
.band__item:last-child{border-right:0}
.band__num{
  font-size:clamp(21px,2.15vw,34px);font-weight:700;letter-spacing:-.035em;line-height:1.05;
  font-variant-numeric:tabular-nums;white-space:nowrap;color:var(--navy);
}
.band__num em{font-style:normal;font-size:.4em;font-weight:500;letter-spacing:0;margin-left:5px;color:var(--tx-3);white-space:nowrap}
.band__lab{font-family:var(--mono);font-size:10px;letter-spacing:.18em;color:var(--tx-3);margin-top:12px;text-transform:uppercase}
.band__cn{font-size:12.5px;color:var(--tx-2);margin-top:5px}

/* ---------- 9. 通用图文块 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,86px);align-items:start}
.split--60{grid-template-columns:1.15fr .85fr}
.split--40{grid-template-columns:.85fr 1.15fr}
.stack>*+*{margin-top:18px}

.figure{position:relative;overflow:hidden;background:var(--tint);border:1px solid var(--line-2)}
.figure img{width:100%;height:100%;object-fit:cover;transition:transform 1.1s var(--ease),filter .6s}
.figure:hover img{transform:scale(1.02)}
.figcap{
  display:flex;justify-content:space-between;gap:12px;
  font-family:var(--mono);font-size:10px;letter-spacing:.15em;text-transform:uppercase;
  color:var(--tx-3);margin-top:10px;
}
.figcap b{font-weight:400;color:var(--tx-2)}
.sec--ink .figcap{color:var(--on-d-3)}
.sec--ink .figcap b{color:var(--on-d-2)}

/* 角标十字 */
.cross{position:relative}
.cross::before,.cross::after{
  content:"";position:absolute;width:9px;height:9px;border-color:rgba(255,255,255,.55);
  border-style:solid;z-index:2;pointer-events:none;
}
.cross::before{top:10px;left:10px;border-width:1px 0 0 1px}
.cross::after{bottom:10px;right:10px;border-width:0 1px 1px 0}

/* ---------- 10. 规格表 ---------- */
.spec{border-top:1px solid var(--line)}
.spec__row{
  display:grid;grid-template-columns:minmax(88px,.32fr) 1fr;gap:16px;
  padding:12px 0;border-bottom:1px solid var(--line-2);
  font-size:13.5px;align-items:baseline;
}
.spec__row dt{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:var(--tx-3);text-transform:uppercase}
.spec__row dd{color:var(--tx);line-height:1.7}
.sec--ink .spec{border-color:var(--line-d)}
.sec--ink .spec__row{border-color:var(--line-d-2)}
.sec--ink .spec__row dt{color:var(--on-d-3)}
.sec--ink .spec__row dd{color:var(--on-d)}

/* 表格 */
.tbl{width:100%;border-collapse:collapse;font-size:13.5px;font-variant-numeric:tabular-nums}
.tbl th,.tbl td{text-align:left;padding:13px 12px;border-bottom:1px solid var(--line-2);vertical-align:top}
.tbl th{
  font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--tx-3);font-weight:400;border-bottom-color:var(--line);
}
.tbl td{color:var(--tx-2)}
.tbl td b{color:var(--tx);font-weight:600}
.tbl td:first-child,.tbl th:first-child{padding-left:0}
.tbl td:last-child,.tbl th:last-child{padding-right:0;text-align:right}
.tbl tr:hover td{background:rgba(12,42,56,.025)}
.sec--ink .tbl th,.sec--ink .tbl td{border-bottom-color:var(--line-d-2)}
.sec--ink .tbl th{color:var(--on-d-3);border-bottom-color:var(--line-d)}
.sec--ink .tbl td{color:var(--on-d-2)}
.sec--ink .tbl td b{color:var(--on-d)}
.sec--ink .tbl tr:hover td{background:rgba(237,244,246,.04)}

/* ---------- 11. 产品 ---------- */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line-2)}
.prod{
  background:var(--white);position:relative;display:flex;flex-direction:column;
  transition:background .4s var(--ease),box-shadow .4s var(--ease);
}
.prod:hover{background:var(--white);box-shadow:0 18px 40px -28px rgba(12,42,56,.55)}
.prod__img{aspect-ratio:4/3;background:var(--tint);overflow:hidden;position:relative}
.prod__img img{width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply;transition:transform .8s var(--ease)}
.prod:hover .prod__img img{transform:scale(1.035)}
.prod__tag{
  position:absolute;top:0;left:0;z-index:2;background:var(--navy);color:#fff;
  font-family:var(--mono);font-size:9.5px;letter-spacing:.18em;padding:6px 10px;
}
.prod__body{padding:22px 24px 26px;display:flex;flex-direction:column;gap:14px;flex:1}
.prod__name{font-size:17px;font-weight:600;letter-spacing:-.01em;line-height:1.35;color:var(--tx)}
.prod__meta{display:flex;flex-wrap:wrap;gap:6px 14px;font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:var(--tx-3)}
.prod__meta span::before{content:"";display:inline-block;width:3px;height:3px;background:var(--teal-hi);margin-right:7px;vertical-align:2px}
.prod__foot{margin-top:auto;padding-top:16px;border-top:1px solid var(--line-2);display:flex;justify-content:space-between;align-items:center}
.prod__foot .mono{color:var(--tx-2)}
.prod .arw{color:var(--teal)}

/* 两条产品线（首页） */
.lines{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line)}
.line-card{background:var(--white);display:flex;flex-direction:column;transition:background .4s var(--ease),box-shadow .4s var(--ease)}
.line-card:hover{background:var(--white);box-shadow:0 22px 50px -30px rgba(12,42,56,.5)}
.line-card__media{aspect-ratio:4/3;background:var(--tint);overflow:hidden}
.line-card__media img{width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply;transform:scale(1.1);transition:transform .8s var(--ease)}
.line-card:hover .line-card__media img{transform:scale(1.14)}
.line-card__body{padding:clamp(22px,2.4vw,30px);display:flex;flex-direction:column;gap:14px;flex:1}
.line-card__top{display:flex;justify-content:space-between;align-items:baseline;gap:12px}
.line-card__top .mono{color:var(--tx-3)}
.line-card__name{font-size:clamp(21px,2vw,28px);font-weight:700;letter-spacing:-.02em;color:var(--tx)}
.line-card__desc{font-size:13.5px;line-height:1.8;color:var(--tx-2)}
.line-list{border-top:1px solid var(--line-2);margin-top:2px}
.line-list li{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px solid var(--line-2);font-size:14px;color:var(--tx)}
.line-list em{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:var(--tx-3);font-style:normal;white-space:nowrap}
.line-card__foot{margin-top:auto;padding-top:16px;display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line-2);color:var(--tx-2)}
.line-card__foot .arw{color:var(--teal)}

/* 产品分类头 */
.cat{display:grid;grid-template-columns:250px 1fr;gap:clamp(24px,4vw,60px);padding:clamp(38px,4.6vw,66px) 0;border-top:1px solid var(--line)}
.cat:first-of-type{border-top:0}
.cat__side{position:sticky;top:calc(var(--nav-h) + 74px);align-self:start}
.cat__idx{font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:var(--teal);margin-bottom:12px}
.cat__name{font-size:clamp(22px,2vw,30px);font-weight:700;letter-spacing:-.02em;line-height:1.2;color:var(--tx)}
.cat__en{font-family:var(--mono);font-size:10px;letter-spacing:.18em;color:var(--tx-3);margin-top:10px;text-transform:uppercase}
.cat__desc{font-size:13.5px;line-height:1.85;color:var(--tx-2);margin-top:18px}
.cat__list{display:grid;grid-template-columns:repeat(3,1fr);gap:0;background:var(--white)}
.cat__list .prod{box-shadow:1px 0 0 var(--line-2), 0 1px 0 var(--line-2)}
.cat__list--2{grid-template-columns:repeat(2,1fr)}

/* 产品分类导航条 */
.catnav{
  position:sticky;top:var(--nav-h);z-index:50;
  background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  box-shadow:0 10px 24px -22px rgba(12,42,56,.5);
}
.catnav a{color:var(--tx-2)!important}
.catnav a:hover{color:var(--teal)!important}
.catnav::-webkit-scrollbar{height:0}

/* ---------- 12. 工艺流程 ---------- */
.flow{display:grid;grid-template-columns:minmax(300px,.8fr) 1.2fr;gap:clamp(28px,4vw,64px);align-items:start}
.flow__list{border-top:1px solid var(--line)}
.flow__item{
  display:flex;gap:18px;align-items:flex-start;width:100%;text-align:left;
  padding:17px 0;border-bottom:1px solid var(--line-2);
  transition:padding .35s var(--ease),background .35s;position:relative;
}
.flow__item::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--teal-hi);
  transform:scaleY(0);transition:transform .35s var(--ease);
}
.flow__item.on{padding-left:18px}
.flow__item.on::before{transform:scaleY(1)}
.flow__idx{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;color:var(--tx-3);padding-top:4px;min-width:26px}
.flow__item.on .flow__idx{color:var(--teal)}
.flow__t{font-size:16px;font-weight:600;letter-spacing:-.01em;color:var(--tx)}
.flow__d{font-size:13px;line-height:1.75;color:var(--tx-2);margin-top:4px}
.flow__stage{position:relative;overflow:hidden;background:var(--tint);aspect-ratio:4/3;border:1px solid var(--line-2)}
.flow__stage img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .7s var(--ease),transform 1.6s var(--ease);transform:scale(1.03)}
.flow__stage img.on{opacity:1;transform:scale(1)}
.flow__cap{
  position:absolute;left:0;bottom:0;z-index:2;padding:10px 14px;
  background:rgba(12,42,56,.82);backdrop-filter:blur(6px);
  font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:rgba(255,255,255,.9);
}

/* ---------- 13. 认证 ---------- */
.certs{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--tint);border:1px solid var(--line)}
.cert{
  background:var(--white);padding:clamp(22px,2.4vw,32px);display:flex;flex-direction:column;gap:12px;
  min-height:210px;position:relative;transition:background .4s;
}
.cert:hover{background:var(--tint)}
.cert__no{font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--tx-3)}
.cert__name{font-size:16.5px;font-weight:600;line-height:1.35;letter-spacing:-.01em;color:var(--tx)}
.cert__std{font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--teal)}
.cert__foot{margin-top:auto;font-size:12px;color:var(--tx-3);line-height:1.7}
.sec--ink .certs{background:var(--line-d-2);border-color:var(--line-d-2)}
.sec--ink .cert{background:rgba(255,255,255,.045)}
.sec--ink .cert:hover{background:rgba(255,255,255,.085)}
.sec--ink .cert__no{color:var(--on-d-3)}
.sec--ink .cert__name{color:var(--on-d)}
.sec--ink .cert__std{color:var(--teal-lt)}
.sec--ink .cert__foot{color:var(--on-d-3)}

/* 证书缩略图 */
.docgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.doc{position:relative;background:#fff;padding:6px;border:1px solid var(--line);transition:transform .4s var(--ease),border-color .4s,box-shadow .4s}
.doc img{width:100%;aspect-ratio:1/1.42;object-fit:cover;object-position:top}
.doc:hover{transform:translateY(-3px);border-color:var(--teal);box-shadow:0 16px 34px -24px rgba(12,42,56,.55)}
.doc span{display:block;font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;color:var(--tx-3);padding:8px 2px 2px}

/* ---------- 14. 客户 ---------- */
.clients{display:grid;grid-template-columns:repeat(6,1fr);gap:1px;background:var(--line-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.client{
  background:var(--white);padding:26px 8px;text-align:center;
  font-size:15px;letter-spacing:.04em;color:var(--tx-2);
  transition:background .35s,color .35s;position:relative;
}
.client:hover{background:var(--tint);color:var(--teal)}

/* ---------- 15. 时间轴 ---------- */
.timeline{border-top:1px solid var(--line)}
.tl{
  display:grid;grid-template-columns:120px 1fr 1.1fr;gap:clamp(16px,3vw,44px);
  padding:clamp(22px,2.4vw,32px) 0;border-bottom:1px solid var(--line-2);
  align-items:baseline;position:relative;
}
.tl__year{font-family:var(--mono);font-size:13px;letter-spacing:.1em;color:var(--teal);font-weight:500}
.tl__t{font-size:17px;font-weight:600;letter-spacing:-.01em;color:var(--tx)}
.tl__d{font-size:13.5px;line-height:1.8;color:var(--tx-2)}

/* ---------- 16. 图集 ---------- */
.gallery{display:grid;grid-template-columns:repeat(12,1fr);gap:clamp(8px,1vw,14px)}
.gallery figure{overflow:hidden;background:var(--tint);position:relative;cursor:zoom-in;height:100%}
.gh-a{height:clamp(240px,32vw,450px)}
.gh-b{height:clamp(190px,21vw,290px)}
.gh-c{height:clamp(150px,15vw,210px)}
.gallery figure img{width:100%;height:100%;object-fit:cover;transition:transform 1s var(--ease),opacity .5s}
.gallery figure:hover img{transform:scale(1.03);opacity:.92}
.g-6{grid-column:span 6}
.g-4{grid-column:span 4}
.g-3{grid-column:span 3}
.g-8{grid-column:span 8}
.ratio-43{aspect-ratio:4/3}
.ratio-32{aspect-ratio:3/2}
.ratio-11{aspect-ratio:1/1}
.ratio-169{aspect-ratio:16/9}

/* ---------- 17. 询价 / 表单 ---------- */
.form{display:grid;grid-template-columns:1fr 1fr;gap:18px 20px;color-scheme:light}
.field{display:flex;flex-direction:column;gap:8px}
.field--full{grid-column:1/-1}
.field label{font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--tx-3)}
.field input,.field textarea,.field select{
  font:inherit;font-size:14.5px;color:var(--tx);background:transparent;
  border:0;border-bottom:1px solid var(--line);padding:11px 2px;
  transition:border-color .3s;border-radius:0;
}
.field input:focus,.field textarea:focus,.field select:focus{outline:0;border-color:var(--teal)}
.field textarea{resize:vertical;min-height:92px}
.field input::placeholder,.field textarea::placeholder{color:var(--tx-3);opacity:.85}

/* ---------- 18. 页脚 ---------- */
.foot{background:var(--navy);color:var(--on-d);padding:clamp(48px,6vw,86px) 0 26px}
.foot__top{display:grid;grid-template-columns:1.5fr .8fr .8fr 1.1fr;gap:clamp(24px,4vw,60px)}
.foot__brand img{width:46px;height:46px;opacity:.92;margin-bottom:18px}
.foot__brand p{font-size:13px;line-height:1.85;color:var(--on-d-3);max-width:34ch}
.foot h5{font-family:var(--mono);font-size:10px;letter-spacing:.2em;color:var(--on-d-3);text-transform:uppercase;margin:0 0 16px;font-weight:400}
.foot__links li{margin-bottom:9px}
.foot__links a{font-size:13.5px;color:var(--on-d-2);transition:color .25s}
.foot__links a:hover{color:#fff}
.foot__c{font-size:13px;line-height:1.9;color:var(--on-d-2)}
.foot__c b{color:var(--on-d);font-weight:500}
.foot__bot{
  margin-top:clamp(36px,4vw,56px);padding-top:20px;border-top:1px solid var(--line-d-2);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:var(--on-d-3);
}
.foot__bot a:hover{color:var(--on-d-2)}

/* ---------- 19. 页头（内页） ---------- */
.phead{
  padding:calc(var(--nav-h) + clamp(48px,7vw,96px)) 0 clamp(34px,4vw,56px);
  border-bottom:1px solid var(--line-d);position:relative;overflow:hidden;
  background:var(--navy);color:var(--on-d);
}
.phead__bg{position:absolute;inset:0;z-index:0;opacity:.42}
.phead__bg img{width:100%;height:100%;object-fit:cover;object-position:center 45%;filter:grayscale(.2) contrast(1.06) saturate(.8)}
.phead__bg::after{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(9,48,72,.40),rgba(13,69,102,.88) 92%)}
.phead .wrap{position:relative;z-index:1}
.crumb{display:flex;gap:10px;align-items:center;font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--on-d-3);margin-bottom:26px}
.crumb a:hover{color:var(--on-d-2)}
.crumb i{font-style:normal;opacity:.5}
.phead h1{font-size:clamp(32px,4.4vw,66px);line-height:1.06;font-weight:700;letter-spacing:-.035em;color:#fff}
.phead__sub{margin-top:20px;max-width:64ch;font-size:15px;line-height:1.9;color:var(--on-d-2)}
.phead__meta{display:flex;gap:clamp(20px,3vw,44px);margin-top:34px;flex-wrap:wrap}
.phead__meta div b{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--teal-lt)}
.phead__meta div span{font-size:12.5px;color:var(--on-d-3)}

/* ---------- 20. 抽屉（产品详情） ---------- */
.drawer{position:fixed;inset:0;z-index:200;visibility:hidden;opacity:0;transition:opacity .35s var(--ease),visibility .35s}
.drawer.open{visibility:visible;opacity:1}
.drawer__mask{position:absolute;inset:0;background:rgba(8,26,34,.66);backdrop-filter:blur(3px)}
.drawer__panel{
  position:absolute;top:0;right:0;bottom:0;width:min(760px,100%);
  background:var(--white);color:var(--tx);overflow-y:auto;
  transform:translateX(3%);transition:transform .45s var(--ease);
  display:flex;flex-direction:column;
}
.drawer.open .drawer__panel{transform:none}
.drawer__head{
  position:sticky;top:0;z-index:3;display:flex;justify-content:space-between;align-items:center;
  padding:18px clamp(20px,3vw,38px);background:var(--white);border-bottom:1px solid var(--line);
}
.drawer__head .mono{color:var(--tx-3)}
.drawer__x{width:32px;height:32px;border:1px solid var(--line);display:grid;place-items:center;font-family:var(--mono);font-size:14px}
.drawer__x:hover{background:var(--navy);color:#fff;border-color:var(--navy)}
.drawer__body{padding:clamp(22px,3vw,38px);display:grid;gap:28px}
.drawer__img{background:var(--tint);border:1px solid var(--line-2)}
.drawer__img img{width:100%;aspect-ratio:4/3;object-fit:contain;mix-blend-mode:multiply}
.drawer h3{font-size:clamp(22px,2.4vw,30px);font-weight:700;letter-spacing:-.025em;line-height:1.2;color:var(--tx)}
.drawer .kvs{display:grid;grid-template-columns:1fr 1fr;gap:0 28px;border-top:1px solid var(--line)}

/* 灯箱 */
.lb{position:fixed;inset:0;z-index:210;background:rgba(8,26,34,.95);display:grid;place-items:center;
  opacity:0;visibility:hidden;transition:opacity .3s,visibility .3s;padding:40px}
.lb.open{opacity:1;visibility:visible}
.lb img{max-width:100%;max-height:86vh;object-fit:contain}
.lb__x{position:absolute;top:22px;right:26px;font-family:var(--mono);font-size:12px;letter-spacing:.16em;color:rgba(237,244,246,.7)}
.lb__x:hover{color:#fff}
.lb__cap{position:absolute;bottom:22px;left:0;right:0;text-align:center;font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;color:rgba(237,244,246,.55)}

/* ---------- 21. 动效 ---------- */
.reveal{transition:opacity .8s var(--ease),transform .8s var(--ease)}
.js .reveal{opacity:0;transform:translateY(18px)}
.js .reveal.in{opacity:1;transform:none}
.no-js .reveal{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.08s}
.reveal[data-d="2"]{transition-delay:.16s}
.reveal[data-d="3"]{transition-delay:.24s}
.reveal[data-d="4"]{transition-delay:.32s}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .hero__media img{animation:none}
  html{scroll-behavior:auto}
}

/* ---------- 22. 响应式 ---------- */
@media (max-width:1180px){
  .prod-grid{grid-template-columns:repeat(2,1fr)}
  .cat{grid-template-columns:1fr}
  .cat__side{position:static}
  .cat__list{grid-template-columns:repeat(3,1fr)}
  .band__grid{grid-template-columns:repeat(3,1fr)}
  .band__item:nth-child(3){border-right:0}
  .band__item:nth-child(-n+3){border-bottom:1px solid var(--line-2)}
  .certs{grid-template-columns:repeat(2,1fr)}
  .clients{grid-template-columns:repeat(3,1fr)}
  .docgrid{grid-template-columns:repeat(3,1fr)}
  .foot__top{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  :root{--nav-h:62px}
  .nav__links{display:none}
  .nav__tel{display:none}
  .nav__burger{display:block}
  .split,.split--60,.split--40{grid-template-columns:1fr;gap:32px}
  .flow{grid-template-columns:1fr}
  .flow__stage{order:-1;aspect-ratio:16/10}
  .hero{min-height:0;padding-top:calc(var(--nav-h) + 34px);padding-bottom:40px}
  .hero__foot{flex-direction:column;align-items:flex-start;gap:22px;margin-top:34px}
  .hero__facts{display:grid;grid-template-columns:1fr 1fr;gap:18px 20px;width:100%}
  .hero__fact b{font-size:14px;line-height:1.5}
  .hero__fact span{font-size:9.5px;letter-spacing:.14em}
  .hero__scroll{display:none}
  .hero h1{font-size:clamp(46px,13vw,64px)}
  .tl{grid-template-columns:1fr;gap:8px}
  .tl__year{margin-bottom:2px}
  .cat__list{grid-template-columns:repeat(2,1fr)}
  .g-6,.g-4,.g-8,.g-3{grid-column:span 12}
  .gallery .ratio-169,.gallery .ratio-43{aspect-ratio:4/3}
  .gh-a,.gh-b,.gh-c{height:auto;aspect-ratio:4/3}
  .form{grid-template-columns:1fr}
  .docgrid{grid-template-columns:repeat(2,1fr)}
  .foot__top{grid-template-columns:1fr;gap:32px}
  .clients{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  body{font-size:15px}
  .nav__right .btn{display:none}
  .hero__kicker{flex-direction:column;align-items:flex-start;gap:4px;font-size:10px}
  .hero__kicker .sep{display:none}
  .hero__facts{grid-template-columns:1fr 1fr}
  .hero__fact b{font-size:13px}
  .band__grid{grid-template-columns:repeat(2,1fr)}
  .band__item{border-right:0;border-bottom:1px solid var(--line-2)}
  .prod-grid{grid-template-columns:1fr}
  .lines{grid-template-columns:1fr}
  .cat__list{grid-template-columns:1fr}
  .certs{grid-template-columns:1fr}
  .clients{grid-template-columns:repeat(2,1fr)}
  .drawer__panel{width:100%}
  .drawer .kvs{grid-template-columns:1fr}
  .cross::before,.cross::after{display:none}
}

/* ---------- 23. 打印 ---------- */
@media print{
  .nav,.menu,.drawer,.lb,.hero__scroll{display:none!important}
  body{background:#fff;color:#000}
}