:root{
  --frost:#1F5F8B;
  --frost-deep:#0E3A57;
  --frost-pale:#E8F2F8;
  --orange:#E2662A;
  --orange-dark:#C9521C;
  --orange-pale:#FBE7DA;
  --jade:#4E8C7A;
  --jade-pale:#E3EFEA;
  --ink:#14212B;
  --snow:#FBFCFD;
  --glass:rgba(255,255,255,0.8);
  --line:#D5E3EC;
  --line-strong:#B9CEDB;
  --muted:#4E6675;
  --rail-w:248px;
  --container:1180px;
  --r-sm:8px;
  --r-md:14px;
  --r-lg:20px;
  --font-display:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.2,.7,.3,1);
  --shadow-soft:0 1px 0 rgba(20,33,43,.04),0 18px 40px -28px rgba(14,58,87,.5);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--ink);
  background-color:var(--snow);
  background-image:
    linear-gradient(to right,rgba(31,95,139,.055) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(31,95,139,.055) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-font-smoothing:antialiased;
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
}
img{max-width:100%;display:block}
svg{max-width:100%}
a{color:inherit}
button{font:inherit;color:inherit}
h1,h2,h3,h4{margin:0;font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;line-height:1.15;color:var(--frost-deep)}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px;border-radius:4px}

/* ===== 跳转链接 ===== */
.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:200;
  display:inline-block;
  padding:10px 18px;
  border-radius:var(--r-sm);
  background:var(--frost-deep);
  color:#fff;
  font-weight:700;
  font-size:15px;
  text-decoration:none;
  transform:translateY(-160%);
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:#fff;background:var(--orange-dark)}

/* ===== 通用版式 ===== */
.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding-inline:clamp(20px,4vw,56px);
}
.section{padding-block:clamp(48px,7vw,96px)}
.section--tint{background:linear-gradient(180deg,var(--frost-pale) 0%,rgba(232,242,248,.42) 100%)}
.section--jade{background:linear-gradient(180deg,var(--jade-pale) 0%,rgba(227,239,234,.4) 100%)}
.section--deep{background:linear-gradient(165deg,var(--frost-deep) 0%,#0A2C43 72%,#103F5F 100%);color:#E7F1F7}
.section--deep h1,.section--deep h2,.section--deep h3{color:#FFFFFF}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--orange);
}
.eyebrow::before{content:"";width:18px;height:3px;border-radius:2px;background:var(--orange)}
.display-title{font-size:clamp(30px,4.4vw,56px);letter-spacing:-.02em;line-height:1.15}
.section-title{font-size:clamp(24px,2.6vw,32px);line-height:1.2}
.lede{font-size:20px;line-height:1.7;color:var(--muted);max-width:34em}
.prose{max-width:34em;font-size:17px;line-height:1.75}
.prose p{margin-bottom:1.1em}
.prose h2{margin:2.2em 0 .6em;font-size:clamp(22px,2.4vw,28px)}
.prose h3{margin:1.8em 0 .5em;font-size:20px}
.prose ul{margin:0 0 1.2em;padding-left:1.1em;list-style:disc}
.prose li{margin-bottom:.4em}
.prose a{color:var(--frost);text-decoration:underline;text-underline-offset:3px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:.94em}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2vw,32px)}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-8{grid-column:span 8}
@media (max-width:900px){
  .col-4,.col-6,.col-8{grid-column:span 12}
}

/* ===== 按钮 ===== */
.btn-row{display:flex;flex-wrap:wrap;gap:12px}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 24px;
  border:1px solid transparent;
  border-radius:999px;
  background:none;
  font-family:var(--font-display);
  font-weight:700;
  font-size:16px;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--orange);color:#FFFFFF;box-shadow:0 14px 26px -16px rgba(226,102,42,.95)}
.btn--primary:hover{background:var(--orange-dark);color:#FFFFFF}
.btn--ghost{background:rgba(255,255,255,.72);color:var(--frost-deep);border-color:var(--line-strong)}
.btn--ghost:hover{background:#FFFFFF;border-color:var(--frost)}

/* ===== 面包屑 ===== */
.breadcrumb{margin-bottom:clamp(20px,3vw,32px)}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:4px;font-size:14px;color:var(--muted)}
.breadcrumb-item{display:inline-flex;align-items:center;gap:4px}
.breadcrumb-item::after{content:"/";color:var(--line-strong)}
.breadcrumb-item:last-child::after{content:""}
.breadcrumb-link{color:var(--frost);text-decoration:none;border-bottom:1px solid transparent}
.breadcrumb-link:hover{border-bottom-color:var(--orange)}
.breadcrumb-current{color:var(--muted)}

/* ===== 状态标签 ===== */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border-radius:999px;
  background:var(--frost-pale);
  color:var(--frost-deep);
  font-size:13px;
  font-weight:700;
  letter-spacing:.02em;
}
.tag--open{background:var(--jade-pale);color:#2C6353}
.tag--open::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--jade);flex:0 0 6px}
.tag--closed{background:#EDF2F5;color:#5D7482}
.tag--closed::before{content:"";width:6px;height:6px;border-radius:50%;background:#93A9B6;flex:0 0 6px}

/* ===== 价格与承诺块 ===== */
.callout{
  padding:clamp(20px,2.4vw,28px);
  border-radius:var(--r-md);
  background:var(--frost-pale);
  border:1px solid var(--line);
}
.callout--price{background:var(--orange-pale);border-color:#F2C6A9}
.callout--jade{background:var(--jade-pale);border-color:#C4DED4}
.callout-title{font-size:14px;font-weight:700;letter-spacing:.1em;color:var(--muted);margin-bottom:8px}
.callout-value{
  display:block;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(24px,2.6vw,30px);
  font-weight:700;
  line-height:1.2;
  color:var(--orange);
  letter-spacing:-.01em;
}
.callout--jade .callout-value{color:#2C6353}
.callout-note{margin-top:10px;font-size:14px;line-height:1.6;color:var(--muted)}

/* ===== 图片容器 ===== */
.media-frame{
  position:relative;
  margin:0;
  overflow:hidden;
  border-radius:var(--r-md);
  aspect-ratio:16/10;
  background:linear-gradient(140deg,var(--frost-pale) 0%,#F4F9FC 55%,var(--jade-pale) 100%);
  border:1px solid var(--line);
}
.media-frame>img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-caption{
  position:absolute;
  inset:auto 0 0 0;
  padding:16px 18px 14px;
  font-size:13px;
  line-height:1.5;
  color:#FFFFFF;
  background:linear-gradient(to top,rgba(14,58,87,.86),rgba(14,58,87,0));
}

/* ===== 头部轨道 ===== */
.site-rail{
  position:fixed;
  inset:0 auto 0 0;
  z-index:80;
  display:flex;
  flex-direction:column;
  gap:clamp(20px,3vh,32px);
  width:var(--rail-w);
  padding:26px 18px 22px;
  overflow-y:auto;
  background:
    linear-gradient(180deg,rgba(232,242,248,.96) 0%,rgba(251,252,253,.92) 46%,rgba(227,239,234,.93) 100%);
  border-right:1px solid var(--line);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
.rail-top{display:flex;flex-direction:column;gap:14px}
.brand{
  display:flex;
  align-items:flex-start;
  gap:12px;
  text-decoration:none;
  color:var(--frost-deep);
}
.brand-mark{
  position:relative;
  flex:0 0 42px;
  width:42px;
  height:42px;
  display:grid;
  place-items:center;
  border-radius:12px;
  background:linear-gradient(150deg,var(--frost) 0%,var(--frost-deep) 100%);
  color:#FFFFFF;
  font-family:var(--font-display);
  font-size:21px;
  font-weight:800;
  line-height:1;
}
.brand-mark::after{
  content:"";
  position:absolute;
  right:-3px;
  bottom:-3px;
  width:12px;
  height:12px;
  border-radius:50%;
  background:var(--orange);
  border:2px solid var(--snow);
}
.brand-text{display:block;min-width:0}
.brand-name{
  display:block;
  font-family:var(--font-display);
  font-size:18px;
  font-weight:800;
  line-height:1.25;
  letter-spacing:-.01em;
  color:var(--frost-deep);
}
.brand-tag{
  display:block;
  margin-top:6px;
  font-size:12px;
  line-height:1.55;
  color:var(--muted);
}
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 14px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  background:rgba(255,255,255,.8);
  color:var(--frost-deep);
  font-size:14px;
  font-weight:700;
  cursor:pointer;
}
.nav-toggle-bars{display:flex;flex-direction:column;justify-content:center;gap:4px;width:18px;height:14px}
.nav-toggle-bar{display:block;width:18px;height:2px;border-radius:2px;background:var(--frost-deep);transition:transform .22s var(--ease),opacity .18s var(--ease)}
.nav-toggle-text{white-space:nowrap}

.site-nav{display:flex;flex-direction:column;flex:1 1 auto;min-height:0;gap:18px}
.nav-list{display:grid;gap:2px;padding-top:18px;border-top:1px solid var(--line)}
.nav-item{list-style:none;min-width:0}
.nav-link{
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px 12px;
  border-radius:10px;
  color:#264C62;
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  letter-spacing:.01em;
  text-decoration:none;
  transition:background-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.nav-link::before{
  content:"";
  flex:0 0 6px;
  width:6px;
  height:6px;
  border-radius:2px;
  background:var(--line-strong);
  transition:height .18s var(--ease),background-color .18s var(--ease);
}
.nav-link:hover{background:rgba(31,95,139,.09);color:var(--frost-deep);transform:translateX(2px)}
.nav-link[aria-current="page"]{background:var(--frost-pale);color:var(--frost-deep)}
.nav-link[aria-current="page"]::before{height:18px;background:var(--orange)}
.rail-foot{margin-top:auto;display:grid;gap:10px;padding-top:18px;border-top:1px solid var(--line)}
.rail-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:12px 16px;
  border-radius:var(--r-sm);
  background:var(--orange);
  color:#FFFFFF;
  font-family:var(--font-display);
  font-size:15px;
  font-weight:800;
  text-decoration:none;
  box-shadow:0 14px 26px -18px rgba(226,102,42,.95);
  transition:transform .18s var(--ease),background-color .18s var(--ease);
}
.rail-cta:hover{background:var(--orange-dark);transform:translateY(-2px)}
.rail-note{font-size:12px;line-height:1.6;color:var(--muted)}

/* ===== 页脚 ===== */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  background:
    linear-gradient(168deg,var(--frost-deep) 0%,#0A2C43 64%,#0F3D5C 100%);
  color:#DCE9F2;
  border-top:4px solid var(--orange);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:56px 56px;
}
.footer-top{
  position:relative;
  display:grid;
  grid-template-columns:1.5fr .7fr .7fr .8fr 1.5fr;
  gap:clamp(24px,3vw,48px);
  padding-block:clamp(44px,6vw,76px) clamp(28px,4vw,48px);
}
.footer-brand{min-width:0}
.footer-brand-link{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:#FFFFFF;
}
.footer-mark{
  flex:0 0 38px;
  width:38px;
  height:38px;
  display:grid;
  place-items:center;
  border-radius:11px;
  background:linear-gradient(150deg,var(--frost) 0%,#1B4F73 100%);
  border:1px solid rgba(255,255,255,.22);
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  color:#FFFFFF;
}
.footer-brand-line{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:800;
  letter-spacing:-.01em;
  color:#FFFFFF;
}
.footer-summary{
  margin-top:18px;
  max-width:30em;
  font-size:15px;
  line-height:1.75;
  color:#B6CFDF;
}
.footer-col{min-width:0}
.footer-col-title{
  margin:0 0 14px;
  font-family:var(--font-display);
  font-size:13px;
  font-weight:800;
  letter-spacing:.14em;
  color:var(--orange);
}
.footer-links{display:grid;gap:2px}
.footer-link{
  display:inline-block;
  padding:5px 0;
  font-size:15px;
  color:#C6DBE8;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.footer-link:hover{color:#FFFFFF;border-bottom-color:var(--orange);transform:translateY(-2px)}
.footer-col--contact{min-width:0}
.footer-contact{display:grid;gap:12px}
.footer-contact-line{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.footer-contact-label{
  flex:0 0 38px;
  font-size:12px;
  letter-spacing:.1em;
  color:#8FB3C9;
}
.footer-contact-value{font-size:14px;line-height:1.5;color:#E7F1F7;word-break:break-word}
.copy-chip{
  padding:3px 10px;
  border:1px solid rgba(255,255,255,.28);
  border-radius:999px;
  background:rgba(255,255,255,.08);
  color:#C6DBE8;
  font-size:12px;
  font-weight:700;
  cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.copy-chip:hover{background:rgba(255,255,255,.18);color:#FFFFFF}
.copy-chip.is-copied{background:var(--jade);border-color:var(--jade);color:#FFFFFF}
.copy-hint{margin-top:10px;min-height:20px;font-size:13px;line-height:1.5;color:#A9D8C6}
.footer-note{margin-top:12px;font-size:13px;line-height:1.6;color:#9FBDD0}
.footer-bottom{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-block:20px 30px;
  border-top:1px solid rgba(255,255,255,.14);
}
.footer-legal{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:13px;
  letter-spacing:.02em;
  color:#9FBDD0;
}
.footer-meta{font-size:13px;color:#9FBDD0}

/* ===== 返回顶部 ===== */
.back-to-top{
  position:fixed;
  right:clamp(16px,3vw,32px);
  bottom:clamp(16px,3vw,32px);
  z-index:90;
  width:48px;
  height:48px;
  display:grid;
  place-items:center;
  border:1px solid rgba(255,255,255,.32);
  border-radius:50%;
  background:var(--frost-deep);
  color:#FFFFFF;
  font-size:19px;
  line-height:1;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  box-shadow:0 18px 32px -20px rgba(14,58,87,.95);
  transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s var(--ease),background-color .18s var(--ease);
}
.back-to-top.is-active{opacity:1;visibility:visible;transform:translateY(0)}
.back-to-top:hover{background:var(--orange)}

/* ===== 渐显 ===== */
.js-reveal .reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .22s var(--ease),transform .22s var(--ease);
}
.js-reveal .reveal.is-visible{opacity:1;transform:none}

/* ===== 移动端与平板 ===== */
@media (max-width:1099px){
  .footer-top{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
  .footer-col--contact{grid-column:1 / -1}
}
@media (max-width:1023px){
  .site-rail{
    position:sticky;
    inset:0 0 auto 0;
    width:100%;
    height:auto;
    gap:0;
    padding:12px clamp(16px,4vw,28px);
    overflow:visible;
    border-right:0;
    border-bottom:1px solid var(--line);
    background:linear-gradient(180deg,rgba(232,242,248,.97) 0%,rgba(251,252,253,.96) 100%);
    box-shadow:0 10px 24px -22px rgba(14,58,87,.7);
  }
  .rail-top{
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    min-height:56px;
  }
  .brand-alignment{display:flex}
  .brand{gap:10px;align-items:center}
  .brand-mark{flex:0 0 36px;width:36px;height:36px;border-radius:10px;font-size:18px}
  .brand-name{font-size:16px}
  .brand-tag{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    max-height:0;
    opacity:0;
    visibility:hidden;
    overflow:hidden;
    gap:0;
    transition:max-height .28s var(--ease),opacity .22s var(--ease),visibility .22s var(--ease);
  }
  .nav-list{
    padding-top:12px;
    border-top:1px solid var(--line);
    margin-top:12px;
    gap:1px;
  }
  .nav-link{padding:11px 12px;border-radius:9px}
  .rail-foot{padding-top:14px;margin-top:14px;margin-bottom:16px}
  .site-rail[data-open="true"] .site-nav{
    max-height:78vh;
    opacity:1;
    visibility:visible;
    overflow-y:auto;
    padding-bottom:8px;
  }
  .site-rail[data-open="true"] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
  .site-rail[data-open="true"] .nav-toggle-bar:nth-child(2){opacity:0}
  .site-rail[data-open="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
  .site-rail[data-open="true"] .nav-toggle{background:var(--frost-pale);border-color:var(--frost)}
  .back-to-top{width:44px;height:44px}
  .site-footer{margin-top:clamp(40px,6vw,64px)}
}
@media (max-width:619px){
  body{font-size:16px}
  .footer-top{grid-template-columns:1fr;gap:28px}
  .footer-brand,.footer-col--contact{grid-column:auto}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .callout-value{font-size:24px}
}

/* ===== 动效降级 ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-reveal .reveal{opacity:1;transform:none}
  .back-to-top{transform:none}
}