/* ==========================================================================
   大发地址指南 / assets/site.css
   左右分屏 · 深海墨导航 · 暖橘锚点 · 精密网格 · 寻路地图母题
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#081A2F;
  --sea:#12395C;
  --paper:#F5F1E8;
  --white:#FFFFFF;
  --orange:#C64B22;
  --orange-deep:#A93A17;
  --mint:#8AE0C3;
  --grid:#A7B4C2;
  --note:#5C6B7A;
  --alert:#B42318;
  --go:#1F7A5C;

  --line:rgba(8,26,47,.16);
  --line-soft:rgba(8,26,47,.09);
  --line-dark:rgba(255,255,255,.16);

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

  --wrap:1260px;
  --gutter:clamp(18px,4vw,48px);
  --dur:150ms;
  --header-h:76px;
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
table{border-collapse:collapse}
a{color:inherit}
#main-content{outline:none}

/* ---------- 3. 中文排版基线 ---------- */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.82;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

:focus-visible{
  outline:3px solid var(--orange);
  outline-offset:2px;
}
.site-header :focus-visible,
.site-footer :focus-visible{
  outline-color:var(--mint);
}

/* ---------- 4. 布局工具 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(40px,6vw,86px)}
.section--tight{padding-block:clamp(28px,4vw,52px)}

.split{
  display:grid;
  gap:clamp(24px,4vw,56px);
  align-items:start;
  grid-template-columns:1fr;
}
.split--5-7{grid-template-columns:5fr 7fr}
.split--4-8{grid-template-columns:4fr 8fr}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2vw,28px);
}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}

/* ---------- 5. 标题与文本 ---------- */
.display{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(2.3rem,5.2vw,4.5rem);
  line-height:1.04;
  letter-spacing:-.03em;
}
.section-title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.5rem,2.6vw,2.2rem);
  line-height:1.22;
  letter-spacing:-.02em;
}
.lede{
  font-size:clamp(16px,1.5vw,19px);
  line-height:1.78;
  color:var(--note);
  max-width:64ch;
  font-weight:400;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--orange);
  font-weight:400;
  line-height:1.4;
}
.eyebrow::before{
  content:"";
  width:22px;
  height:1px;
  background:currentColor;
  flex:none;
}

/* ---------- 6. 装饰线 ---------- */
.rule{
  border:0;
  border-top:1px solid var(--line);
  margin:0;
  height:0;
}
.rule--dark{border-top-color:var(--line-dark)}
.path-line{
  position:relative;
  height:1px;
  background:var(--line);
  width:100%;
}
.path-line::after{
  content:"";
  position:absolute;
  right:0;
  top:-2px;
  width:5px;
  height:5px;
  background:var(--orange);
}

/* ---------- 7. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  padding:4px 9px;
  border:1px solid var(--grid);
  color:var(--note);
  background:var(--white);
  white-space:nowrap;
  line-height:1.5;
}
.tag--mint{background:var(--mint);border-color:var(--mint);color:var(--ink)}
.tag--orange{background:var(--orange);border-color:var(--orange);color:var(--white)}
.tag--ink{background:var(--ink);border-color:var(--ink);color:var(--white)}

/* ---------- 8. 卡片 ---------- */
.panel{
  position:relative;
  background:var(--white);
  border:1px solid var(--line);
  padding:clamp(20px,3vw,32px);
}

/* ---------- 9. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 24px;
  border:1px solid transparent;
  border-radius:0;
  background:none;
  color:inherit;
  font-family:var(--font-body);
  font-size:15px;
  font-weight:700;
  line-height:1.3;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:background var(--dur) ease,border-color var(--dur) ease,color var(--dur) ease;
}
.btn--solid{background:var(--orange);border-color:var(--orange);color:var(--white)}
.btn--solid:hover,.btn--solid:focus-visible{background:var(--orange-deep);border-color:var(--orange-deep);color:var(--white)}
.btn--ink{background:var(--ink);border-color:var(--ink);color:var(--white)}
.btn--ink:hover,.btn--ink:focus-visible{background:var(--sea);border-color:var(--sea);color:var(--white)}
.btn--mint{background:var(--mint);border-color:var(--mint);color:var(--ink)}
.btn--mint:hover,.btn--mint:focus-visible{background:#6FD2B1;border-color:#6FD2B1;color:var(--ink)}
.btn--line{border-color:var(--ink);color:var(--ink);background:transparent}
.btn--line:hover,.btn--line:focus-visible{background:var(--ink);color:var(--white)}
.btn--ghost{border-color:rgba(255,255,255,.42);color:var(--white);background:transparent}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--mint);color:var(--mint)}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding-block:14px;
  border-bottom:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--note);
}
.breadcrumb a{
  color:var(--note);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--dur) ease,border-color var(--dur) ease;
}
.breadcrumb a:hover{color:var(--orange);border-bottom-color:var(--orange)}
.breadcrumb-sep{color:var(--grid);font-family:var(--font-mono)}
.breadcrumb [aria-current="page"]{color:var(--ink)}

/* ---------- 11. 正文容器 ---------- */
.content{max-width:74ch}
.content > * + *{margin-top:1.05em}
.content h2{
  font-family:var(--font-display);
  font-size:clamp(1.35rem,2.2vw,1.75rem);
  font-weight:900;
  line-height:1.3;
  letter-spacing:-.02em;
  margin-top:2.2em;
}
.content h3{
  font-size:1.14rem;
  font-weight:700;
  line-height:1.45;
  margin-top:1.8em;
}
.content h2 + *,.content h3 + *{margin-top:.6em}
.content ul,.content ol{padding-left:1.35em}
.content ul{list-style:square}
.content ol{list-style:decimal}
.content li{margin:.35em 0}
.content li::marker{color:var(--orange)}
.content a{
  color:var(--orange);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
  transition:background var(--dur) ease;
}
.content a:hover{background:rgba(198,75,34,.1)}
.content blockquote{
  border-left:3px solid var(--orange);
  padding-left:18px;
  color:var(--note);
  font-size:1.02em;
}
.content code,.content pre{font-family:var(--font-mono);font-size:.9em}
.content code{background:rgba(8,26,47,.06);padding:.15em .4em}
.content pre{background:var(--ink);color:var(--paper);padding:18px 20px;overflow-x:auto}
.content hr{border:0;border-top:1px solid var(--line);margin:2em 0}
.content table{width:100%;font-size:.95em}
.content th,.content td{
  border-bottom:1px solid var(--line);
  padding:10px 12px;
  text-align:left;
  vertical-align:top;
}
.content th{
  font-family:var(--font-mono);
  font-size:.82em;
  letter-spacing:.08em;
  color:var(--note);
  border-bottom-color:var(--grid);
}

/* ---------- 12. 图片容器（页面阶段放置占位） ---------- */
.img-frame{
  position:relative;
  display:block;
  margin:0;
  background:var(--white);
  border:1px solid var(--line);
  overflow:hidden;
}
.img-frame > img,.img-frame > svg{display:block;width:100%;height:auto}
.img-frame--16x10{aspect-ratio:16/10}
.img-frame--4x5{aspect-ratio:4/5}
.img-frame--1x1{aspect-ratio:1/1}
.img-frame__ph{
  display:grid;
  place-items:center;
  width:100%;
  height:100%;
  min-height:160px;
  padding:20px;
  text-align:center;
  background-color:var(--paper);
  background-image:
    linear-gradient(var(--line-soft) 1px,transparent 1px),
    linear-gradient(90deg,var(--line-soft) 1px,transparent 1px);
  background-size:32px 32px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--note);
}
.img-frame__cap{
  display:flex;
  justify-content:space-between;
  gap:12px;
  padding:10px 14px;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.04em;
  color:var(--note);
}

/* ---------- 13. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--ink);
  color:var(--white);
  border-bottom:1px solid var(--line-dark);
  transition:box-shadow var(--dur) ease;
}
.site-header[data-stuck]{
  box-shadow:0 1px 0 rgba(255,255,255,.08),0 10px 26px rgba(8,26,47,.22);
}
.skip-link{
  position:absolute;
  left:16px;
  top:0;
  z-index:300;
  transform:translateY(-140%);
  padding:10px 16px;
  background:var(--mint);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  text-decoration:none;
  transition:transform var(--dur) ease;
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

.header-inner{
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  gap:clamp(16px,2.5vw,32px);
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  color:var(--white);
  text-decoration:none;
}
.brand-mark{
  position:relative;
  display:block;
  width:34px;
  height:34px;
  flex:none;
  border:1px solid rgba(255,255,255,.5);
}
.brand-mark::before{
  content:"";
  position:absolute;
  left:12px;
  top:12px;
  width:8px;
  height:8px;
  background:var(--orange);
}
.brand-mark::after{
  content:"";
  position:absolute;
  left:15px;
  top:20px;
  width:1px;
  height:14px;
  background:var(--mint);
}
.brand-text{display:flex;flex-direction:column;gap:2px;line-height:1.2}
.brand-name{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:900;
  letter-spacing:-.01em;
  color:var(--white);
}
.brand-tagline{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.06em;
  color:rgba(255,255,255,.55);
}

.header-rule{
  position:relative;
  flex:1 1 auto;
  min-width:24px;
  height:1px;
  background:linear-gradient(90deg,rgba(255,255,255,.26),rgba(255,255,255,.06));
}
.header-rule-node{
  position:absolute;
  right:0;
  top:-2px;
  width:5px;
  height:5px;
  background:var(--mint);
}

.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(14px,2.2vw,30px);
  flex:0 0 auto;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(12px,1.7vw,24px);
  counter-reset:navidx;
}
.nav-item{counter-increment:navidx}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:6px 0;
  color:rgba(255,255,255,.76);
  font-size:14.5px;
  font-weight:400;
  letter-spacing:.02em;
  line-height:1.4;
  text-decoration:none;
  transition:color var(--dur) ease;
}
.nav-link::before{
  content:"0" counter(navidx);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:0;
  color:rgba(255,255,255,.34);
  transition:color var(--dur) ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:1px;
  background:var(--mint);
  transition:width var(--dur) ease;
}
.nav-link:hover{color:var(--white)}
.nav-link:hover::after{width:100%}
.nav-link[aria-current="page"]{color:var(--mint);font-weight:700}
.nav-link[aria-current="page"]::before{color:var(--orange)}
.nav-link[aria-current="page"]::after{width:100%;height:2px;background:var(--orange)}

.nav-quick{display:none}
.nav-quick-link{
  display:flex;
  align-items:center;
  justify-content:center;
  padding:13px 12px;
  border:1px solid rgba(255,255,255,.24);
  background:transparent;
  color:var(--white);
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  text-align:center;
  text-decoration:none;
  transition:background var(--dur) ease,border-color var(--dur) ease,color var(--dur) ease;
}
.nav-quick-link:hover{border-color:var(--mint);color:var(--mint)}
.nav-quick-link--accent{background:var(--orange);border-color:var(--orange);color:var(--white)}
.nav-quick-link--accent:hover{background:var(--orange-deep);border-color:var(--orange-deep);color:var(--white)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 12px;
  border:1px solid rgba(255,255,255,.28);
  border-radius:0;
  background:none;
  color:var(--white);
  cursor:pointer;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  transition:border-color var(--dur) ease,color var(--dur) ease;
}
.nav-toggle:hover{border-color:var(--mint);color:var(--mint)}
.nav-toggle-bars{
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:4px;
  width:16px;
  height:12px;
  flex:none;
}
.nav-toggle-bars span{
  display:block;
  width:100%;
  height:1.5px;
  background:currentColor;
  transition:transform var(--dur) ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child{transform:translateY(2.75px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child{transform:translateY(-2.75px) rotate(-45deg)}
.nav-toggle-label{line-height:1.2}

/* ---------- 14. 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink);
  color:rgba(255,255,255,.72);
  font-size:14.5px;
  line-height:1.7;
}
.footer-route{
  height:1px;
  background:repeating-linear-gradient(90deg,rgba(138,224,195,.55) 0 18px,transparent 18px 34px);
}
.footer-inner{
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(40px,6vw,72px) var(--gutter) 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1.5fr;
  gap:clamp(24px,4vw,56px);
  align-items:start;
}
.footer-brand-mark{
  display:block;
  position:relative;
  width:34px;
  height:34px;
  margin-bottom:16px;
  border:1px solid rgba(255,255,255,.5);
}
.footer-brand-mark::before{
  content:"";
  position:absolute;
  left:12px;
  top:12px;
  width:8px;
  height:8px;
  background:var(--orange);
}
.footer-brand-mark::after{
  content:"";
  position:absolute;
  left:15px;
  top:20px;
  width:1px;
  height:14px;
  background:var(--mint);
}
.footer-brand-name{
  margin:0 0 10px;
  font-family:var(--font-display);
  font-size:18px;
  font-weight:900;
  letter-spacing:-.01em;
  color:var(--white);
  line-height:1.3;
}
.footer-brand-note{
  margin:0;
  max-width:30ch;
  font-size:13.5px;
  line-height:1.72;
  color:rgba(255,255,255,.6);
}
.footer-col-title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:400;
  letter-spacing:.18em;
  color:var(--mint);
  line-height:1.4;
}
.footer-link-list{display:flex;flex-direction:column;gap:9px}
.footer-link{
  display:inline-block;
  color:rgba(255,255,255,.78);
  font-size:14px;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--dur) ease,border-color var(--dur) ease;
}
.footer-link:hover{color:var(--mint);border-bottom-color:var(--mint)}

.footer-contact{display:flex;flex-direction:column;gap:10px}
.contact-line{
  display:flex;
  align-items:baseline;
  flex-wrap:wrap;
  gap:8px;
}
.contact-label{
  flex:none;
  min-width:34px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:rgba(255,255,255,.42);
  line-height:1.6;
}
.contact-value{
  font-size:13.5px;
  line-height:1.6;
  color:rgba(255,255,255,.92);
  text-decoration:none;
  word-break:break-all;
}
.footer-note{
  margin:6px 0 0;
  font-size:12.5px;
  line-height:1.68;
  color:rgba(255,255,255,.45);
}
.copy-btn{
  padding:3px 9px;
  border:1px solid rgba(255,255,255,.28);
  border-radius:0;
  background:none;
  color:rgba(255,255,255,.7);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  line-height:1.6;
  cursor:pointer;
  transition:border-color var(--dur) ease,color var(--dur) ease,background var(--dur) ease;
}
.copy-btn:hover{border-color:var(--mint);color:var(--mint)}
.copy-btn[data-copied]{
  background:var(--go);
  border-color:var(--go);
  color:var(--white);
}

.footer-bottom{
  margin-top:clamp(32px,5vw,56px);
  padding:18px 0 26px;
  border-top:1px solid var(--line-dark);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 26px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:rgba(255,255,255,.5);
}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-legal-link{
  color:rgba(255,255,255,.62);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--dur) ease,border-color var(--dur) ease;
}
.footer-legal-link:hover{color:var(--mint);border-bottom-color:var(--mint)}
.footer-copy,.footer-icp{margin:0;line-height:1.6}

/* ---------- 15. JS 注入的滚动进度 ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  width:0;
  height:3px;
  background:var(--orange);
  z-index:200;
  pointer-events:none;
}

/* ---------- 16. 平板 ---------- */
@media (max-width:1080px){
  .nav-list{gap:12px}
  .nav-link{font-size:13.5px}
  .nav-link::before{display:none}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:1000px){
  :root{--header-h:66px}
  .header-inner{justify-content:space-between;gap:14px}
  .header-rule{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:10px var(--gutter) 24px;
    background:var(--ink);
    border-top:1px solid var(--line-dark);
    border-bottom:1px solid var(--line-dark);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
  }
  .site-nav[data-open]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-item{width:100%}
  .nav-link{
    width:100%;
    padding:15px 0;
    font-size:18px;
    font-weight:700;
    color:rgba(255,255,255,.86);
    border-bottom:1px solid rgba(255,255,255,.1);
  }
  .nav-link::before{
    display:inline;
    font-size:11px;
    color:rgba(255,255,255,.4);
  }
  .nav-link::after{display:none}
  .nav-link:hover{color:var(--mint)}
  .nav-link[aria-current="page"]{color:var(--mint)}
  .nav-link[aria-current="page"]::after{display:block;width:38px;height:2px;bottom:8px}

  .nav-quick{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:10px;
    margin-top:18px;
  }
}

/* ---------- 17. 手机 ---------- */
@media (max-width:860px){
  .split--5-7,.split--4-8{grid-template-columns:1fr}
  .span-3,.span-4{grid-column:span 6}
  .span-5,.span-6,.span-7,.span-8,.span-9{grid-column:span 12}
}

@media (max-width:640px){
  body{font-size:16px;line-height:1.78}
  .brand-tagline{display:none}
  .nav-quick{grid-template-columns:1fr}
  .span-3,.span-4{grid-column:span 12}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-brand{grid-column:auto}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:10px}
  .display{letter-spacing:-.02em}
}

/* ---------- 18. 减少动效 ---------- */
@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;
  }
  .nav-link::after,.skip-link{transition:none}
}