/* ==========================================================================
   dmtycm.com · base.css 全站共享样式 v1.0
   风格：消毒液简约风 —— 纯白 + 浅蓝 + 浅灰，专业、干净、克制
   说明：本文件为全站唯一共享样式，页面专属样式一律写 css/<页面名>.css
   ========================================================================== */

/* ---------- 设计令牌 ---------- */
:root{
  --white:#ffffff;
  --gray-50:#f7f9fb;
  --gray-100:#eef1f4;
  --gray-200:#e2e6eb;
  --gray-300:#cdd4dc;
  --gray-400:#a9b4c0;
  --gray-500:#8493a2;
  --gray-600:#5f6f80;
  --gray-700:#47586a;
  --gray-800:#2f3e4e;
  --gray-900:#1e2a36;

  --blue-50:#f2f8fd;
  --blue-100:#e5f1fa;
  --blue-150:#d8eaf7;
  --blue-200:#c0ddf0;
  --blue-300:#9ac9e6;
  --blue-400:#6fb0d9;
  --blue-500:#4a97cf;
  --blue-600:#2f7fb8;
  --blue-700:#25689d;
  --blue-800:#205580;

  --radius-s:6px;
  --radius-m:12px;
  --radius-l:20px;
  --shadow-s:0 2px 10px rgba(31,58,84,.06);
  --shadow-m:0 10px 30px rgba(31,58,84,.10);
  --shadow-l:0 24px 60px rgba(31,58,84,.14);
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",sans-serif;
  --header-h:72px;
  --trans:.3s cubic-bezier(.4,0,.2,1);
}

/* ---------- Reset / 基础 ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  color:var(--gray-800);
  background:var(--white);
  line-height:1.75;
  font-size:15px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--blue-600);text-decoration:none;transition:color var(--trans)}
a:hover{color:var(--blue-800)}
ul,ol{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,select,textarea{font-family:inherit;font-size:15px}
h1,h2,h3,h4{color:var(--gray-900);line-height:1.35;font-weight:700}
h1{font-size:clamp(28px,4vw,44px)}
h2{font-size:clamp(22px,3vw,32px)}
h3{font-size:clamp(18px,2vw,22px)}
h4{font-size:16px}
section{position:relative}
main{display:block;overflow:hidden}

.container{width:min(1200px,92%);margin:0 auto}
.ta-c{text-align:center}

/* ---------- 顶部固定导航 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  height:var(--header-h);
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid transparent;
  transition:background var(--trans),box-shadow var(--trans),border-color var(--trans);
}
.site-header.is-scrolled{
  background:rgba(255,255,255,.98);
  border-bottom-color:var(--gray-100);
  box-shadow:var(--shadow-s);
}
.header-inner{
  height:100%;
  display:flex;align-items:center;gap:18px;
}
.brand{
  display:flex;align-items:center;gap:10px;
  flex-shrink:0;
}
.brand-logo{width:42px;height:42px;object-fit:contain;border-radius:8px}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text em{font-style:normal;font-weight:800;font-size:19px;color:var(--gray-900);letter-spacing:1px}
.brand-text small{font-size:11px;color:var(--gray-500);letter-spacing:2px}

.nav-toggle{
  display:none;width:42px;height:42px;flex-direction:column;
  align-items:center;justify-content:center;gap:5px;
  margin-left:auto;
}
.nav-toggle span{
  width:22px;height:2px;border-radius:2px;background:var(--gray-800);
  transition:transform var(--trans),opacity var(--trans);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.site-nav{margin-left:auto;display:flex;align-items:center;gap:14px}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-list>li{position:relative}
.nav-link{
  display:block;padding:10px 12px;font-size:14px;color:var(--gray-700);
  border-radius:var(--radius-s);font-weight:500;position:relative;
}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;
  border-radius:2px;background:var(--blue-500);transform:scaleX(0);
  transform-origin:left;transition:transform var(--trans);
}
.nav-link:hover{color:var(--blue-600)}
.nav-link:hover::after,.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--blue-600)}

.has-sub .submenu{
  position:absolute;top:calc(100% + 8px);left:0;min-width:190px;
  background:var(--white);border:1px solid var(--gray-100);
  border-radius:var(--radius-m);box-shadow:var(--shadow-m);
  padding:10px;display:grid;gap:2px;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity var(--trans),transform var(--trans),visibility var(--trans);
  z-index:50;
}
.has-sub .submenu.submenu-grid{grid-template-columns:repeat(2,1fr);min-width:320px}
.has-sub .submenu a{
  padding:9px 12px;font-size:13.5px;color:var(--gray-700);border-radius:var(--radius-s);
  display:flex;align-items:center;gap:8px;white-space:nowrap;
}
.has-sub .submenu a::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--blue-300);flex-shrink:0}
.has-sub .submenu a:hover{background:var(--blue-50);color:var(--blue-700)}
.has-sub:hover .submenu,.has-sub:focus-within .submenu{
  opacity:1;visibility:visible;transform:translateY(0);
}
.nav-cta{
  padding:10px 20px;background:var(--blue-500);color:#fff !important;
  border-radius:999px;font-size:14px;font-weight:600;white-space:nowrap;
  box-shadow:0 6px 16px rgba(74,151,207,.35);
  transition:background var(--trans),transform var(--trans),box-shadow var(--trans);
}
.nav-cta:hover{background:var(--blue-600);transform:translateY(-2px);box-shadow:0 10px 22px rgba(74,151,207,.4)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 30px;border-radius:999px;font-size:15px;font-weight:600;
  transition:background var(--trans),color var(--trans),transform var(--trans),box-shadow var(--trans);
  border:1px solid transparent;
}
.btn-blue{background:var(--blue-500);color:#fff;box-shadow:0 8px 20px rgba(74,151,207,.32)}
.btn-blue:hover{background:var(--blue-600);color:#fff;transform:translateY(-2px)}
.btn-ghost{border-color:var(--blue-300);color:var(--blue-600);background:transparent}
.btn-ghost:hover{background:var(--blue-50);border-color:var(--blue-500);transform:translateY(-2px)}
.btn-light{background:#fff;color:var(--blue-700);box-shadow:var(--shadow-m)}
.btn-light:hover{transform:translateY(-2px);box-shadow:var(--shadow-l)}
.btn-arrow::after{content:"→";font-size:16px;transition:transform var(--trans)}
.btn-arrow:hover::after{transform:translateX(4px)}
.btn-block{width:100%}
.btn-sm{padding:9px 18px;font-size:13.5px}

/* ---------- 区块标题（页面可覆盖节拍） ---------- */
.sec-head{max-width:680px;margin-bottom:44px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;letter-spacing:3px;font-weight:700;color:var(--blue-600);
  text-transform:uppercase;margin-bottom:10px;
}
.sec-kicker::before{content:"";width:22px;height:2px;background:var(--blue-400);border-radius:2px}
.sec-head.center .sec-kicker::after{content:"";width:22px;height:2px;background:var(--blue-400);border-radius:2px}
.sec-sub{color:var(--gray-500);font-size:14.5px;margin-top:12px}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px;
  font-size:13px;color:var(--gray-400);
}
.breadcrumb a{color:var(--gray-500)}
.breadcrumb a:hover{color:var(--blue-600)}
.breadcrumb span::after{content:"/";margin-left:6px;color:var(--gray-300)}
.breadcrumb span:last-child::after{content:none}
.breadcrumb .bc-now{color:var(--gray-700);font-weight:500}

/* ---------- 滚动渐入 ---------- */
.reveal,.reveal-left,.reveal-right,.reveal-zoom{
  opacity:0;transition:opacity .8s ease,transform .8s cubic-bezier(.22,.61,.36,1);
  will-change:opacity,transform;
}
.reveal{transform:translateY(28px)}
.reveal-left{transform:translateX(-36px)}
.reveal-right{transform:translateX(36px)}
.reveal-zoom{transform:scale(.94)}
.reveal.in,.reveal-left.in,.reveal-right.in,.reveal-zoom.in{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--gray-900);color:var(--gray-300);margin-top:0}
.footer-main{
  display:grid;grid-template-columns:1.4fr 1fr 1fr .8fr 1fr;gap:36px;
  padding:64px 0 46px;
}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-brand img{width:44px;height:44px;object-fit:contain;border-radius:8px}
.footer-brand span{display:flex;flex-direction:column;line-height:1.2}
.footer-brand em{font-style:normal;font-weight:800;font-size:18px;color:#fff;letter-spacing:1px}
.footer-brand small{font-size:11px;color:var(--gray-400);letter-spacing:2px}
.footer-about p{font-size:13.5px;line-height:1.9;color:var(--gray-400);margin-bottom:18px}
.footer-contact li{font-size:13.5px;color:var(--gray-300);margin-bottom:6px}
.footer-contact a{color:var(--blue-300)}
.footer-contact a:hover{color:#fff}
.footer-col h4{
  color:#fff;font-size:14.5px;letter-spacing:1px;
  margin-bottom:18px;position:relative;padding-bottom:10px;
}
.footer-col h4::after{content:"";position:absolute;left:0;bottom:0;width:26px;height:2px;background:var(--blue-500);border-radius:2px}
.footer-col ul li{margin-bottom:8px}
.footer-col ul a{font-size:13.5px;color:var(--gray-400)}
.footer-col ul a:hover{color:var(--blue-300);padding-left:4px}
.footer-bar{border-top:1px solid rgba(255,255,255,.08);padding:18px 0}
.footer-bar .container{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px}
.footer-bar p{font-size:13px;color:var(--gray-500)}
.footer-icp{color:var(--gray-500)}

/* ---------- 返回顶部 ---------- */
#backTop{
  position:fixed;right:26px;bottom:30px;z-index:900;
  width:46px;height:46px;border-radius:50%;
  background:var(--blue-500);color:#fff;font-size:18px;
  box-shadow:var(--shadow-m);opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity var(--trans),transform var(--trans),visibility var(--trans),background var(--trans);
}
#backTop.show{opacity:1;visibility:visible;transform:none}
#backTop:hover{background:var(--blue-700)}

/* ---------- 表单 ---------- */
.field{margin-bottom:16px}
.field label{display:block;font-size:13.5px;font-weight:600;color:var(--gray-700);margin-bottom:7px}
.field input,.field select,.field textarea{
  width:100%;padding:12px 14px;border:1px solid var(--gray-200);border-radius:var(--radius-s);
  background:var(--white);color:var(--gray-800);outline:none;
  transition:border-color var(--trans),box-shadow var(--trans);
}
.field textarea{min-height:110px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{
  border-color:var(--blue-400);box-shadow:0 0 0 3px rgba(74,151,207,.15);
}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-note{font-size:12.5px;color:var(--gray-400);margin-top:12px}
.form-ok{
  display:none;background:var(--blue-50);border:1px solid var(--blue-200);
  color:var(--blue-800);padding:16px 18px;border-radius:var(--radius-m);
  font-size:14px;margin-bottom:16px;
}
.form-ok.show{display:block}

/* ---------- 标签墙 ---------- */
.tagwall{display:flex;flex-wrap:wrap;gap:10px}
.tagwall a{
  padding:8px 16px;border:1px solid var(--gray-200);border-radius:999px;
  font-size:13.5px;color:var(--gray-600);background:var(--white);
  transition:all var(--trans);
}
.tagwall a:hover{border-color:var(--blue-400);color:var(--blue-700);background:var(--blue-50);transform:translateY(-2px)}

/* ---------- 响应式 ---------- */
@media (max-width:1100px){
  .footer-main{grid-template-columns:1.3fr 1fr 1fr 1fr;gap:28px}
  .footer-about{grid-column:1/-1}
  .nav-list>li:not(.has-sub) .nav-link{padding:10px 8px}
  .nav-cta{display:none}
}
@media (max-width:920px){
  .nav-toggle{display:flex}
  .site-nav{
    position:fixed;top:var(--header-h);left:0;right:0;bottom:0;
    background:var(--white);flex-direction:column;align-items:stretch;
    padding:20px 6% 40px;overflow-y:auto;gap:6px;
    transform:translateX(100%);transition:transform var(--trans);
  }
  .site-nav.open{transform:none;box-shadow:var(--shadow-l)}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-list>li{border-bottom:1px solid var(--gray-100)}
  .nav-link{padding:15px 6px;font-size:16px}
  .nav-link::after{display:none}
  .has-sub .submenu{
    position:static;opacity:1;visibility:visible;transform:none;
    box-shadow:none;border:none;border-radius:0;padding:0 6px 10px;
    display:none;min-width:0;
  }
  .has-sub .submenu.submenu-grid{grid-template-columns:1fr 1fr;min-width:0}
  .has-sub.open .submenu{display:grid}
  .has-sub.open>.nav-link{color:var(--blue-600)}
  .nav-cta{display:inline-flex;margin-top:18px;align-self:flex-start}
  .footer-main{grid-template-columns:1fr 1fr;gap:24px}
}
@media (max-width:600px){
  :root{--header-h:62px}
  .brand-logo{width:36px;height:36px}
  .brand-text em{font-size:16px}
  .brand-text small{font-size:10px}
  .field-row{grid-template-columns:1fr;gap:0}
  .footer-main{grid-template-columns:1fr;padding:44px 0 30px}
  .btn{padding:12px 24px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important}
  html{scroll-behavior:auto}
}