/* =========================================================
   永信登录页 · 共享外壳样式 /assets/site.css
   深蓝骨架 · 墨绿分区 · 琥珀状态 · 档案式排版
   ========================================================= */

:root{
  --ink:#16212B;
  --navy:#0B2545;
  --navy-panel:#123A63;
  --navy-line:#1D4E80;
  --green:#103B33;
  --green-soft:#17604F;
  --amber:#F0A93B;
  --amber-soft:#FFD48A;
  --paper:#F4F1EA;
  --mist:#C9D3DC;
  --ok:#2E9E6B;
  --diff:#C0453A;

  --wrap:1280px;
  --rail:220px;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC",serif;
  --font-body:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}
body{
  margin:0;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:15px;
  line-height:1.75;
  word-break:break-word;
  -webkit-font-smoothing:antialiased;
}
img,svg,video{display:block;max-width:100%;height:auto}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0}
input{font:inherit}
h1,h2,h3,h4,h5{
  margin:0 0 .55em;
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.18;
  letter-spacing:.005em;
  color:var(--ink);
}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
a{color:var(--green-soft);text-decoration:none}
a:hover{text-decoration:underline}
strong{font-weight:700}
:focus-visible{outline:2px solid var(--amber);outline-offset:2px}

/* ---------- 2. 排版与容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:clamp(18px,4vw,40px);
}
.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}
.skip-link{
  position:absolute;
  left:12px;top:-70px;
  z-index:200;
  padding:10px 18px;
  background:var(--amber);
  color:var(--navy);
  font-size:13px;
  letter-spacing:.06em;
  border-radius:2px;
  transition:top .22s var(--ease);
}
.skip-link:focus{top:12px;text-decoration:none}

.display{
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(38px,6vw,72px);
  line-height:1.05;
  letter-spacing:-.01em;
}
.page-title{
  font-size:clamp(28px,3.6vw,40px);
  font-weight:700;
  line-height:1.15;
}
.section-title{font-size:clamp(21px,2.4vw,28px)}
.eyebrow{
  display:inline-block;
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--green-soft);
  margin:0 0 10px;
}
.index-num{
  display:inline-block;
  padding:2px 9px;
  background:var(--amber-soft);
  color:var(--navy);
  font-size:12px;
  letter-spacing:.08em;
  font-variant-numeric:tabular-nums;
}
.lead{font-size:16px;line-height:1.8;color:rgba(22,33,43,.82)}
.muted{font-size:12px;letter-spacing:.06em;color:#5B6B78}
.num{font-variant-numeric:tabular-nums;text-align:right}

.section{padding-block:clamp(40px,6vw,80px)}
.section--tight{padding-block:clamp(26px,3.5vw,48px)}
.section--navy{background:var(--navy);color:var(--paper)}
.section--navy .section-title,.section--navy h2,.section--navy h3{color:var(--paper)}
.section--green{background:var(--green);color:var(--paper)}
.section--green .eyebrow{color:var(--amber-soft)}

/* ---------- 3. 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:1000px){
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:680px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 4. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:12px 20px;
  font-family:var(--font-body);
  font-size:13px;
  letter-spacing:.06em;
  line-height:1.2;
  border:1px solid transparent;
  border-radius:2px;
  cursor:pointer;
  text-decoration:none;
  transition:background .2s var(--ease),color .2s var(--ease),
             border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{text-decoration:none}
.btn--primary{background:var(--amber);color:var(--navy);font-weight:500}
.btn--primary:hover{background:var(--amber-soft);transform:translateY(-1px)}
.btn--ghost{background:transparent;color:var(--paper);border-color:var(--navy-line)}
.btn--ghost:hover{border-color:var(--amber);color:var(--amber-soft)}
.btn--dark{background:var(--navy);color:var(--paper)}
.btn--dark:hover{background:var(--navy-panel)}
.btn--sm{padding:9px 14px;font-size:12px;letter-spacing:.04em}

/* ---------- 5. 面包屑 ---------- */
.breadcrumb{padding-block:16px;font-size:12px;letter-spacing:.06em;color:#5B6B78}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:4px}
.breadcrumb a{color:var(--green-soft)}
.breadcrumb li+li::before{content:"/";margin-right:6px;color:var(--mist)}
.breadcrumb [aria-current="page"]{color:var(--ink)}

/* ---------- 6. 基础组件 ---------- */
.panel{
  background:#fff;
  border:1px solid var(--mist);
  border-top:3px solid var(--navy-panel);
  padding:clamp(18px,2.4vw,28px);
}
.panel--cut{
  --cut:22px;
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
  border-left:0;border-right:0;border-bottom:0;
}
.panel--green{border-top-color:var(--green-soft);background:rgba(23,96,79,.06)}
.panel__head{display:flex;align-items:baseline;justify-content:space-between;gap:14px;margin-bottom:14px}
.panel__title{font-family:var(--font-display);font-size:19px;font-weight:700;margin:0}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-size:11px;
  letter-spacing:.08em;
  background:rgba(23,96,79,.12);
  color:var(--green-soft);
  border:1px solid rgba(23,96,79,.3);
}
.tag--amber{background:rgba(240,169,59,.16);color:#8A5A08;border-color:rgba(240,169,59,.45)}
.tag--diff{background:rgba(192,69,58,.12);color:var(--diff);border-color:rgba(192,69,58,.35)}
.tag--ok{background:rgba(46,158,107,.12);color:#1F7350;border-color:rgba(46,158,107,.35)}

.list-dashed li{
  padding:10px 0;
  border-bottom:1px dashed var(--mist);
  display:flex;
  gap:14px;
  justify-content:space-between;
  align-items:baseline;
  font-size:14px;
}
.list-dashed li:last-child{border-bottom:0}

.prose{max-width:72ch}
.prose h2{margin-top:1.8em;font-size:clamp(20px,2.2vw,26px)}
.prose h3{margin-top:1.5em;font-size:18px}
.prose ul{margin:0 0 1.2em;padding-left:1.1em;list-style:square}
.prose li{margin-bottom:.5em}
.prose hr{border:0;border-top:1px dashed var(--mist);margin:2em 0}

/* ---------- 7. 图片容器（供页面阶段放置素材） ---------- */
.figure{
  margin:0;
  background:var(--navy-panel);
  border:1px solid var(--mist);
  overflow:hidden;
}
.figure--cut{
  --cut:22px;
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
  border:0;
}
.figure__media{position:relative;display:block;width:100%;overflow:hidden}
.figure__media img{width:100%;height:100%;object-fit:cover}
.figure__media--16x9{aspect-ratio:16/9}
.figure__media--4x3{aspect-ratio:4/3}
.figure__media--1x1{aspect-ratio:1/1}
.figure__media--21x9{aspect-ratio:21/9}
.figure__caption{
  padding:10px 14px;
  background:var(--paper);
  border-top:1px dashed var(--mist);
  font-size:12px;
  letter-spacing:.06em;
  color:rgba(22,33,43,.72);
}
.media-slot{
  display:flex;
  align-items:center;
  justify-content:center;
  width:100%;
  aspect-ratio:16/9;
  color:rgba(244,241,234,.72);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  background:
    repeating-linear-gradient(135deg,rgba(29,78,128,.55) 0 10px,transparent 10px 22px),
    var(--navy-panel);
}

/* ---------- 8. 站点头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--navy);
  color:var(--paper);
  box-shadow:0 10px 26px rgba(11,37,69,.24);
}
.header-top{background:var(--navy);border-bottom:1px solid rgba(29,78,128,.6)}
.header-top__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  min-height:54px;
  padding-block:8px;
}
.brand{display:flex;align-items:center;gap:12px;color:inherit;min-width:0}
.brand:hover{text-decoration:none}
.brand__glyph{
  flex:0 0 auto;
  width:34px;height:34px;
  display:grid;place-items:center;
  background:var(--amber);
  color:var(--navy);
  font-family:var(--font-display);
  font-size:17px;
  font-weight:700;
  clip-path:polygon(0 0,calc(100% - 9px) 0,100% 9px,100% 100%,0 100%);
}
.brand__text{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand__name{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:700;
  letter-spacing:.05em;
  line-height:1.2;
}
.brand__sub{
  font-size:11px;
  letter-spacing:.1em;
  line-height:1.3;
  color:rgba(244,241,234,.62);
}
.header-top__meta{display:flex;align-items:center;gap:14px;margin:0}
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-size:11px;
  letter-spacing:.08em;
  border:1px solid rgba(240,169,59,.45);
  background:rgba(240,169,59,.1);
  color:var(--amber-soft);
}
.chip--live::before{
  content:"";
  width:6px;height:6px;
  border-radius:50%;
  background:var(--amber);
}
.header-top__icp{font-size:11px;letter-spacing:.08em;color:rgba(244,241,234,.6)}

.header-main{background:var(--navy-panel)}
.header-main__inner{
  display:flex;
  align-items:center;
  gap:16px;
  min-height:64px;
  padding-block:8px;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:9px 12px;
  border:1px solid var(--navy-line);
  color:var(--paper);
  font-size:12px;
  letter-spacing:.08em;
  cursor:pointer;
}
.nav-toggle:hover{border-color:var(--amber)}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars span{
  display:block;height:2px;background:var(--amber);
  transition:transform .25s var(--ease),opacity .25s var(--ease);
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.site-nav{margin-right:auto}
.site-nav__list{display:flex;flex-wrap:wrap;gap:2px}
.site-nav__link{
  display:block;
  padding:10px 14px;
  font-size:13px;
  letter-spacing:.06em;
  color:rgba(244,241,234,.78);
  border-bottom:2px solid transparent;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.site-nav__link:hover{
  color:var(--amber-soft);
  background:rgba(244,241,234,.06);
  text-decoration:none;
}
.site-nav__link[aria-current="page"]{
  color:var(--amber);
  border-bottom-color:var(--amber);
}

.header-tools{display:flex;align-items:center;gap:12px;margin-left:auto}

.site-search{position:relative;flex:0 1 300px;min-width:180px}
.site-search__input{
  width:100%;
  height:38px;
  padding:0 36px 0 13px;
  background:rgba(244,241,234,.07);
  border:1px solid var(--navy-line);
  border-radius:2px;
  color:var(--paper);
  font-size:13px;
  letter-spacing:.03em;
}
.site-search__input::placeholder{color:rgba(244,241,234,.48)}
.site-search__input::-webkit-search-cancel-button{-webkit-appearance:none}
.site-search__input:focus{
  outline:none;
  border-color:var(--amber);
  background:rgba(244,241,234,.12);
}
.site-search__input:focus-visible{outline:2px solid var(--amber);outline-offset:1px}
.site-search__hint{
  position:absolute;
  right:10px;top:50%;
  transform:translateY(-50%);
  font-size:11px;
  color:rgba(244,241,234,.5);
  border:1px solid rgba(244,241,234,.25);
  padding:0 6px;
  line-height:18px;
  pointer-events:none;
}
.site-search__panel{
  position:absolute;
  top:calc(100% + 6px);
  left:0;right:0;
  z-index:30;
  max-height:320px;
  overflow-y:auto;
  background:var(--paper);
  color:var(--ink);
  border:1px solid var(--mist);
  border-top:3px solid var(--amber);
  box-shadow:0 20px 40px rgba(11,37,69,.3);
}
.site-search__result{
  display:block;
  padding:10px 13px;
  font-size:13px;
  color:var(--ink);
  border-bottom:1px dashed var(--mist);
}
.site-search__result:last-child{border-bottom:0}
.site-search__result:hover,
.site-search__result:focus{background:var(--amber-soft);text-decoration:none}
.site-search__result span{
  display:block;
  margin-top:2px;
  font-size:11px;
  letter-spacing:.08em;
  color:#5B6B78;
}
.site-search__empty{padding:12px 13px;font-size:12px;color:#5B6B78;margin:0}

.scroll-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:3px;
  z-index:95;
  pointer-events:none;
  background:transparent;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--green-soft),var(--amber));
}

/* ---------- 9. 站点页脚 ---------- */
.site-footer{
  margin-top:auto;
  background:var(--navy);
  color:rgba(244,241,234,.78);
}
.footer-main{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1fr 1.4fr;
  gap:clamp(20px,3vw,36px);
  padding-block:clamp(36px,5vw,64px) clamp(28px,4vw,48px);
}
.footer-brand__glyph{
  width:38px;height:38px;
  display:grid;place-items:center;
  margin-bottom:14px;
  background:var(--amber);
  color:var(--navy);
  font-family:var(--font-display);
  font-size:18px;
  font-weight:700;
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,0 100%);
}
.footer-brand__name{
  margin:0 0 4px;
  font-family:var(--font-display);
  font-size:20px;
  font-weight:700;
  letter-spacing:.05em;
  color:var(--paper);
}
.footer-brand__sub{
  margin:0 0 14px;
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(244,241,234,.55);
}
.footer-brand__note{
  margin:0;
  padding-left:10px;
  border-left:2px solid var(--green-soft);
  font-size:12px;
  line-height:1.7;
  color:rgba(244,241,234,.62);
}
.footer-col__title{
  margin:0 0 14px;
  font-family:var(--font-body);
  font-size:12px;
  font-weight:500;
  letter-spacing:.16em;
  color:var(--amber);
}
.footer-col__list li{margin-bottom:9px}
.footer-col__list a{
  font-size:13px;
  color:rgba(244,241,234,.82);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-col__list a:hover{
  color:var(--amber);
  border-bottom-color:var(--amber);
  text-decoration:none;
}
.footer-contact__list li{display:grid;gap:2px;margin-bottom:12px}
.footer-contact__label{font-size:11px;letter-spacing:.1em;color:rgba(244,241,234,.5)}
.footer-contact__value{font-size:13px;color:var(--paper);word-break:break-all}
.footer-contact__note{
  margin:0 0 14px;
  font-size:12px;
  line-height:1.7;
  color:rgba(244,241,234,.55);
}
.footer-link{
  display:inline-block;
  font-size:12px;
  letter-spacing:.06em;
  color:var(--amber);
  border-bottom:1px solid rgba(240,169,59,.5);
}
.footer-link:hover{color:var(--amber-soft);border-bottom-color:var(--amber-soft);text-decoration:none}

.footer-band{
  background:var(--green);
  border-top:1px solid rgba(23,96,79,.9);
}
.footer-band__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  padding-block:14px;
  font-size:11px;
  letter-spacing:.08em;
  color:rgba(244,241,234,.66);
}

/* ---------- 10. 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:clamp(14px,3vw,28px);
  bottom:clamp(14px,3vw,28px);
  z-index:70;
  width:48px;height:48px;
  display:grid;place-items:center;
  border-radius:50%;
  background:var(--navy);
  color:var(--paper);
  font-size:16px;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  box-shadow:0 10px 24px rgba(11,37,69,.35);
  transition:opacity .3s var(--ease),transform .3s var(--ease),visibility .3s var(--ease);
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top::before{
  content:"";
  position:absolute;
  inset:-4px;
  border-radius:50%;
  pointer-events:none;
  background:conic-gradient(var(--amber) calc(var(--progress,0) * 1%),rgba(244,241,234,.18) 0);
  -webkit-mask:radial-gradient(farthest-side,transparent calc(100% - 3px),#000 calc(100% - 2px));
  mask:radial-gradient(farthest-side,transparent calc(100% - 3px),#000 calc(100% - 2px));
}
.to-top:hover{background:var(--navy-panel)}

/* ---------- 11. 显现与章节高亮协议 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(8px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
[data-reveal][data-reveal-in]{opacity:1;transform:none}

[data-toc-link]{
  display:block;
  padding:8px 12px;
  font-size:13px;
  letter-spacing:.04em;
  color:#4E5C68;
  border-left:2px solid var(--mist);
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
[data-toc-link]::before{
  content:attr(data-index);
  margin-right:9px;
  font-size:11px;
  color:#8A97A2;
}
[data-toc-link]:hover{color:var(--navy);text-decoration:none;background:rgba(29,78,128,.06)}
[data-toc-link][aria-current="true"]{
  color:var(--navy);
  font-weight:500;
  border-left-color:var(--amber);
  background:rgba(240,169,59,.16);
}
[data-toc-link][aria-current="true"]::before{color:#8A5A08}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1120px){
  .brand__sub{display:none}
  .header-top__icp{display:none}
  .site-search{flex-basis:220px}
}
@media (max-width:1000px){
  .footer-main{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .header-main__inner{flex-wrap:wrap;row-gap:10px}
  .site-nav{
    position:absolute;
    left:0;right:0;
    top:100%;
    z-index:20;
    display:none;
    max-height:min(70vh,520px);
    overflow-y:auto;
    background:var(--navy);
    border-top:1px solid var(--navy-line);
    border-bottom:3px solid var(--amber);
    box-shadow:0 18px 30px rgba(11,37,69,.35);
  }
  .site-header[data-open] .site-nav{display:block}
  .site-nav__list{flex-direction:column;gap:0;padding:6px clamp(18px,4vw,40px) 18px}
  .site-nav__link{
    padding:14px 0;
    font-size:14px;
    border-bottom:1px dashed rgba(244,241,234,.2);
  }
  .site-nav__link[aria-current="page"]{border-bottom-color:var(--amber)}
  .header-tools{margin-left:0;flex:1 1 auto;justify-content:flex-end}
  .site-search{flex:1 1 150px;min-width:0}
}
@media (max-width:680px){
  .header-top__inner{min-height:46px;gap:12px}
  .brand{gap:9px}
  .brand__glyph{width:30px;height:30px;font-size:15px}
  .brand__name{font-size:15px}
  .header-main__inner{min-height:56px;gap:10px}
  .site-search__input{height:34px;font-size:12px;padding-right:30px}
  .btn--sm{padding:8px 10px;font-size:11px;letter-spacing:.02em}
  .footer-main{grid-template-columns:minmax(0,1fr)}
  .footer-band__inner{justify-content:flex-start}
  .to-top{width:42px;height:42px}
}

/* ---------- 13. 无障碍与动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  [data-reveal]{opacity:1;transform:none}
  .btn--primary:hover{transform:none}
}