/* =========================================================
   正版蓝指南 · 全站共享样式  /assets/site.css
   框架：暖纸档案纸 + 深海蓝框景 + 钴蓝/电光青刻度系统
   ========================================================= */

/* ---------- 1. 全局变量 ---------- */
:root{
  --paper:#F3E9D2;
  --paper-white:#FFF9EC;
  --ink:#0E1726;
  --deep:#061A40;
  --cobalt:#1F4FD8;
  --cyan:#00D8FF;
  --orange:#FF8A3D;
  --mist:#A9C7FF;
  --red:#C9354A;
  --green:#38D39F;

  --ink-72:rgba(14,23,38,.72);
  --ink-52:rgba(14,23,38,.52);
  --ink-24:rgba(14,23,38,.24);
  --ink-16:rgba(14,23,38,.16);
  --ink-08:rgba(14,23,38,.08);
  --paper-72:rgba(255,249,236,.72);
  --paper-48:rgba(255,249,236,.48);
  --mist-32:rgba(169,199,255,.32);
  --mist-16:rgba(169,199,255,.16);

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

  --shell-max:1440px;
  --gutter:clamp(1rem,4vw,3.5rem);
  --ease:cubic-bezier(.22,.68,.18,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,dl,dd,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
img,svg,video{display:block;max-width:100%;height:auto;}
table{border-collapse:collapse;width:100%;}
[hidden]{display:none!important;}

/* ---------- 3. 中文排版基座 ---------- */
body{
  background-color:var(--paper);
  background-image:
    linear-gradient(to right,var(--ink-08) 1px,transparent 1px),
    linear-gradient(to bottom,var(--ink-08) 1px,transparent 1px);
  background-size:120px 120px;
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:clamp(16px,.5vw + 14.6px,17.5px);
  line-height:1.78;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body.nav-open{overflow:hidden;}

h1,h2,h3,h4,h5,h6{
  font-family:var(--font-sans);
  font-weight:800;
  line-height:1.18;
  letter-spacing:.07em;
  color:var(--ink);
  text-wrap:balance;
}
h1{font-size:clamp(2.1rem,5.4vw,4.2rem);letter-spacing:.09em;}
h2{font-size:clamp(1.5rem,3vw,2.3rem);}
h3{font-size:clamp(1.1rem,1.6vw,1.35rem);}
p{text-wrap:pretty;}

.mono{
  font-family:var(--font-mono);
  font-size:.76em;
  letter-spacing:.14em;
  font-variant-numeric:tabular-nums;
}
.rule{height:1px;background:var(--ink-16);border:0;}

/* ---------- 4. 焦点可见与动效降级 ---------- */
:focus-visible{
  outline:2px solid var(--cobalt);
  outline-offset:3px;
}
.site-footer :focus-visible,
.site-header[data-open="true"] .site-nav :focus-visible{
  outline-color:var(--cyan);
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
}

/* ---------- 5. 布局容器 ---------- */
.shell{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(2.5rem,6vw,5rem);}
.section--tight{padding-block:clamp(1.75rem,4vw,3rem);}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(1rem,2vw,1.75rem);
}
.flow > * + *{margin-top:var(--flow-gap,1rem);}

/* ---------- 6. 页头 ---------- */
.skip-link{
  position:fixed;
  top:.75rem;
  left:.75rem;
  z-index:300;
  padding:.7rem 1.1rem;
  background:var(--deep);
  color:var(--paper-white);
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.16em;
  border:1px solid var(--cyan);
  transform:translateY(-180%);
  transition:transform .25s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background-color:var(--paper);
  border-bottom:1px solid var(--ink);
}
.header-scale{
  height:6px;
  background-color:var(--paper-white);
  background-image:
    repeating-linear-gradient(90deg,var(--ink) 0 1px,transparent 1px 14px),
    linear-gradient(90deg,var(--cobalt),var(--cyan) 62%,var(--orange));
  background-size:100% 4px,100% 2px;
  background-position:left top,left bottom;
  background-repeat:no-repeat,no-repeat;
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(1rem,2.5vw,2.5rem);
  min-height:74px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  flex-shrink:0;
  padding-block:.35rem;
}
.brand-mark{
  position:relative;
  width:14px;
  height:14px;
  background:var(--cobalt);
  flex-shrink:0;
}
.brand-mark::after{
  content:"";
  position:absolute;
  inset:4px;
  background:var(--cyan);
}
.brand-text{display:flex;flex-direction:column;line-height:1.1;}
.brand-name{
  font-size:1.04rem;
  font-weight:800;
  letter-spacing:.16em;
  color:var(--ink);
}
.brand-sub{
  margin-top:.3rem;
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.2em;
  color:var(--ink-52);
}

.header-rail{
  display:flex;
  align-items:center;
  gap:clamp(1rem,2.4vw,2.25rem);
}
.site-nav{display:block;}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(.9rem,1.9vw,1.9rem);
}
.nav-link{
  display:inline-block;
  padding-block:.35rem;
  font-size:.8rem;
  letter-spacing:.15em;
  color:var(--ink-72);
  border-bottom:2px solid transparent;
  transition:color .25s var(--ease),border-color .25s var(--ease);
}
.nav-link:hover{color:var(--cobalt);}
.nav-link[aria-current="page"]{
  color:var(--cobalt);
  border-bottom-color:var(--cobalt);
}

.header-actions{
  display:flex;
  align-items:center;
  gap:.6rem;
}
.search-entry{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.55rem .9rem;
  background:var(--deep);
  color:var(--paper-white);
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.2em;
  border:1px solid var(--deep);
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.search-entry::before{
  content:"";
  width:6px;
  height:6px;
  background:var(--cyan);
  flex-shrink:0;
}
.search-entry:hover{
  background:var(--cobalt);
  border-color:var(--cobalt);
  color:#fff;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.55rem .7rem;
  border:1px solid var(--ink-24);
  color:var(--ink);
  transition:border-color .25s var(--ease),color .25s var(--ease);
}
.nav-toggle:hover{border-color:var(--cobalt);color:var(--cobalt);}
.nav-toggle-bars{
  display:grid;
  gap:4px;
  width:20px;
}
.nav-toggle-bars span{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .3s var(--ease),opacity .3s var(--ease);
}
.nav-toggle-label{
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.16em;
}
.site-header[data-open="true"] .nav-toggle{border-color:var(--cyan);color:var(--cobalt);}
.site-header[data-open="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.site-header[data-open="true"] .nav-toggle-bars span:nth-child(2){opacity:0;}
.site-header[data-open="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

.header-progress{
  position:absolute;
  left:0;
  bottom:-1px;
  width:100%;
  height:2px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cobalt),var(--cyan));
  pointer-events:none;
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  margin-top:clamp(2rem,6vw,5rem);
  background-color:var(--deep);
  color:var(--paper-white);
  border-top:1px solid var(--deep);
}
.footer-scale{
  height:6px;
  background-color:var(--deep);
  background-image:
    repeating-linear-gradient(90deg,var(--mist) 0 1px,transparent 1px 14px),
    linear-gradient(90deg,var(--cobalt),var(--cyan) 62%,var(--orange));
  background-size:100% 4px,100% 2px;
  background-position:left top,left bottom;
  background-repeat:no-repeat,no-repeat;
}
.footer-inner{padding-block:clamp(2.5rem,5vw,4rem) clamp(1.25rem,2.5vw,2rem);}
.footer-grid{
  display:grid;
  grid-template-columns:1.7fr .9fr .9fr .9fr 1.5fr;
  gap:clamp(1.5rem,3vw,3rem);
  padding-bottom:clamp(2rem,4vw,3.25rem);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;}
.footer-lockup{
  font-size:clamp(1.4rem,2.5vw,2rem);
  font-weight:800;
  letter-spacing:.18em;
  color:var(--paper-white);
  line-height:1.2;
}
.footer-tagline{
  margin-top:.7rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.3em;
  color:var(--cyan);
}
.footer-cta{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  margin-top:1.4rem;
  padding:.55rem 1rem;
  border:1px solid var(--cyan);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.18em;
  transition:background .25s var(--ease),color .25s var(--ease);
}
.footer-cta::after{content:"→";font-size:.9em;}
.footer-cta:hover{background:var(--cyan);color:var(--deep);}

.footer-col-title,
.footer-contact-title{
  position:relative;
  padding-top:.85rem;
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.28em;
  color:var(--mist);
  margin-bottom:1rem;
}
.footer-col-title::before,
.footer-contact-title::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:26px;
  height:1px;
  background:var(--cyan);
}
.footer-list{display:flex;flex-direction:column;gap:.15rem;}
.footer-link{
  display:inline-block;
  padding-block:.32rem;
  font-size:.88rem;
  letter-spacing:.06em;
  color:var(--paper-72);
  transition:color .25s var(--ease),padding-left .25s var(--ease);
}
.footer-link:hover{color:var(--cyan);padding-left:.35rem;}

.footer-contact-line{
  font-family:var(--font-mono);
  font-size:.78rem;
  line-height:1.9;
  letter-spacing:.04em;
  color:var(--paper-72);
  overflow-wrap:anywhere;
}
.footer-contact-line + .footer-contact-line{margin-top:.2rem;}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding-top:clamp(1.1rem,2vw,1.5rem);
  border-top:1px solid var(--mist-16);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem 1.4rem;
}
.footer-legal-link{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  color:var(--paper-48);
  border-bottom:1px solid transparent;
  transition:color .25s var(--ease),border-color .25s var(--ease);
}
.footer-legal-link:hover{color:var(--cyan);border-bottom-color:var(--cyan);}
.footer-meta{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem 1.4rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  color:var(--paper-48);
}
.footer-icp{color:var(--paper-48);}
.footer-copy{color:var(--mist);}

/* ---------- 8. 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55rem;
  min-height:46px;
  padding:.6rem 1.35rem;
  border:1px solid var(--ink);
  background:var(--paper-white);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.18em;
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.btn:hover{background:var(--deep);border-color:var(--deep);color:var(--paper-white);}
.btn--primary{background:var(--cobalt);border-color:var(--cobalt);color:#fff;}
.btn--primary:hover{background:var(--deep);border-color:var(--cyan);color:var(--cyan);}
.btn--cyan{background:var(--cyan);border-color:var(--cyan);color:var(--deep);}
.btn--cyan:hover{background:var(--paper-white);border-color:var(--cyan);color:var(--deep);}
.btn--ghost{background:transparent;border-color:var(--cyan);color:var(--cyan);}
.btn--ghost:hover{background:var(--cyan);border-color:var(--cyan);color:var(--deep);}

/* ---------- 9. 标签、卡片、标签条 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.22rem .6rem;
  border:1px solid currentColor;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.16em;
  line-height:1.6;
  white-space:nowrap;
}
.tag--orange{background:var(--deep);border-color:transparent;color:var(--orange);}
.tag--red{background:transparent;border-color:var(--red);color:var(--red);}
.tag--green{background:var(--deep);border-color:transparent;color:var(--green);}

.card{
  position:relative;
  background:var(--paper-white);
  border:1px solid var(--ink-16);
  padding:clamp(1.1rem,2vw,1.7rem);
  transition:border-color .25s var(--ease);
}
.card:hover{border-color:var(--cobalt);}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.65rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.3em;
  color:var(--cobalt);
}
.eyebrow::before{
  content:"";
  width:28px;
  height:1px;
  background:currentColor;
  flex-shrink:0;
}
.eyebrow--light{color:var(--cyan);}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.14em;
  color:var(--ink-52);
}
.breadcrumb-link{
  color:var(--cobalt);
  border-bottom:1px solid transparent;
  transition:border-color .2s var(--ease);
}
.breadcrumb-link:hover{border-bottom-color:currentColor;}
.breadcrumb-sep{color:var(--mist);}
.breadcrumb [aria-current="page"]{color:var(--ink);}

/* ---------- 11. 长文容器 ---------- */
.prose{max-width:730px;}
.prose > * + *{margin-top:1.15em;}
.prose h2{margin-top:2.3em;letter-spacing:.06em;}
.prose h3{margin-top:1.9em;letter-spacing:.05em;}
.prose p{color:var(--ink-72);}
.prose ul,.prose ol{padding-left:1.3em;list-style:revert;}
.prose li + li{margin-top:.35em;}
.prose a{color:var(--cobalt);border-bottom:1px solid currentColor;}
.prose strong{color:var(--ink);}

/* ---------- 12. 图片容器基础 ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--ink);
  background-color:var(--deep);
  background-image:
    linear-gradient(to right,var(--mist-16) 1px,transparent 1px),
    linear-gradient(to bottom,var(--mist-16) 1px,transparent 1px);
  background-size:40px 40px;
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--portrait{aspect-ratio:3/4;}
.media-frame--square{aspect-ratio:1/1;}

/* ---------- 13. 动效类（由 JS 触发） ---------- */
html[data-motion="on"] [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
html[data-motion="on"] [data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- 14. 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:clamp(1rem,3vw,2.5rem);
  bottom:clamp(1rem,3vw,2.5rem);
  z-index:70;
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.6rem .85rem;
  background:var(--deep);
  color:var(--paper-white);
  border:1px solid var(--cyan);
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s var(--ease),background .25s var(--ease);
}
.to-top[data-visible="true"]{
  opacity:1;
  visibility:visible;
  transform:none;
}
.to-top:hover{background:var(--cobalt);}
.to-top-arrow{
  display:block;
  width:10px;
  height:10px;
  border-left:1px solid currentColor;
  border-top:1px solid currentColor;
  transform:rotate(45deg);
}
.to-top-label{
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.18em;
}

/* ---------- 15. 响应式：平板 ---------- */
@media (max-width:1180px){
  .footer-grid{grid-template-columns:1.6fr 1fr 1fr;row-gap:clamp(1.75rem,3vw,2.5rem);}
  .footer-contact{grid-column:1 / -1;}
  .footer-contact-line{display:inline-block;margin-right:1.4rem;}
}

@media (max-width:980px){
  .header-inner{min-height:64px;}
  .nav-toggle{display:inline-flex;}
  .header-rail{gap:.6rem;}

  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    z-index:2;
    background:var(--deep);
    border-bottom:1px solid var(--cyan);
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    transition:max-height .4s var(--ease),visibility .4s var(--ease);
  }
  .site-header[data-open="true"] .site-nav{
    max-height:min(72vh,560px);
    overflow-y:auto;
    visibility:visible;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:.4rem 0 .9rem;
  }
  .nav-item{border-bottom:1px solid var(--mist-16);}
  .nav-link{
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:1rem var(--gutter);
    font-size:.86rem;
    letter-spacing:.16em;
    color:rgba(255,249,236,.86);
    border-bottom:0;
  }
  .nav-link:hover{color:var(--cyan);}
  .nav-link[aria-current="page"]{
    color:var(--cyan);
    border-bottom:0;
    background:rgba(0,216,255,.08);
  }
  .nav-link[aria-current="page"]::after{
    content:"";
    width:22px;
    height:1px;
    background:var(--cyan);
    flex-shrink:0;
  }

  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));}
  .prose{max-width:none;}
}

/* ---------- 16. 响应式：手机 ---------- */
@media (max-width:680px){
  .brand-sub{display:none;}
  .brand-name{font-size:.96rem;letter-spacing:.13em;}
  .brand-mark{width:12px;height:12px;}
  .brand-mark::after{inset:3px;}
  .search-entry{padding:.45rem .6rem;font-size:.64rem;letter-spacing:.12em;}
  .nav-toggle-label{display:none;}
  .nav-toggle{padding:.5rem;}
  .header-inner{gap:.6rem;}

  .footer-grid{grid-template-columns:1fr;row-gap:1.75rem;}
  .footer-contact{grid-column:auto;}
  .footer-contact-line{display:block;margin-right:0;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}

  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr));}
  .to-top{right:.9rem;bottom:.9rem;}
}

@media (max-width:400px){
  .search-entry{display:none;}
}