/* =========================================================
   永丽皇宫CN站 · 共享样式 /assets/site.css
   东方宫廷档案室 × 数字校对台
   ========================================================= */

/* ---------- 变量 ---------- */
:root{
  --cinnabar:#B13A2F;
  --cinnabar-deep:#8E2A21;
  --gold:#D4A64A;
  --gold-light:#F0D89A;
  --dai:#33505A;
  --dai-deep:#24383F;
  --paper:#F6F0E3;
  --ink:#1A1714;
  --proof:#D1453B;
  --stone:#6E7F82;
  --lotus:#E8D9C0;
  --night:#2B1E1C;
  --hair:rgba(26,23,20,.14);
  --hair-light:rgba(246,240,227,.72);
  --serif:"Noto Serif SC","Songti SC","STKaiti",serif;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"JetBrains Mono","IBM Plex Mono","Courier New",monospace;
  --wrap:1180px;
  --frame:3px;
  --shadow-brut:6px 6px 0 var(--ink);
  --ease:cubic-bezier(.2,.72,.3,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:8rem;
}
body{
  margin:0;
  font-family:var(--sans);
  font-size:17px;
  line-height:1.78;
  color:var(--ink);
  background-color:var(--paper);
  background-image:repeating-linear-gradient(0deg,rgba(26,23,20,.022) 0 1px,transparent 1px 6px);
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block;max-width:100%;}
img{height:auto;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
ul,ol{margin:0;padding:0;list-style:none;}
figure,blockquote,dl,dd{margin:0;}
h1,h2,h3,h4,h5{
  margin:0;
  font-family:var(--serif);
  font-weight:700;
  line-height:1.22;
  letter-spacing:.01em;
  text-wrap:balance;
}
h1{font-size:clamp(2.1rem,4.6vw,3.4rem);font-weight:900;}
h2{font-size:clamp(1.6rem,2.8vw,2.3rem);}
h3{font-size:clamp(1.15rem,1.7vw,1.42rem);}
p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}
hr{border:0;height:1px;background:var(--hair);margin:2rem 0;}
strong{font-weight:700;}
::selection{background:var(--gold-light);color:var(--ink);}
[hidden]{display:none !important;}

/* ---------- 无障碍与工具类 ---------- */
:focus-visible{
  outline:3px solid var(--gold);
  outline-offset:2px;
}
.skip-link{
  position:absolute;
  top:-5rem;
  left:1rem;
  z-index:200;
  padding:.6rem 1rem;
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--gold-light);
  background:var(--ink);
  border:2px solid var(--gold);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:.6rem;}
.visually-hidden{
  position:absolute !important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
}
.mono{font-family:var(--mono);letter-spacing:.04em;}
.wrap{width:min(100% - 2rem,var(--wrap));margin-inline:auto;}
@media (min-width:768px){.wrap{width:min(100% - 3rem,var(--wrap));}}
.stack>*+*{margin-top:1.5rem;}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.4rem;
  padding:.62rem 1.05rem;
  font-family:var(--sans);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1.3;
  color:var(--ink);
  background:var(--paper);
  border:2px solid var(--ink);
  border-radius:2px;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s,color .18s,border-color .18s;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:4px 4px 0 var(--ink);}
.btn:active{transform:translate(0,0);box-shadow:none;}
.btn-seal{
  color:#fff;
  background:var(--cinnabar);
  border-color:var(--ink);
  box-shadow:4px 4px 0 var(--ink);
}
.btn-seal:hover{background:var(--proof);}
.btn-gold{background:var(--gold);color:var(--ink);}
.btn-gold:hover{background:var(--gold-light);}
.btn-ghost{background:transparent;color:var(--dai);border-color:var(--dai);}
.btn-ghost:hover{color:var(--ink);border-color:var(--ink);}
.btn-block{width:100%;}

/* ---------- 头部：宫门门楣 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--paper);
  border-bottom:var(--frame) solid var(--ink);
}
.header-band{
  height:5px;
  background:repeating-linear-gradient(90deg,var(--cinnabar) 0 18px,var(--gold) 18px 36px);
}
.header-inner{
  width:min(100% - 2rem,var(--wrap));
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:clamp(.75rem,2vw,2rem);
  padding:.85rem 0 .9rem;
}

/* 品牌印章 */
.brand{
  display:flex;
  align-items:center;
  gap:.7rem;
  flex:0 0 auto;
}
.brand-seal{
  flex:0 0 auto;
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  font-family:var(--serif);
  font-size:25px;
  font-weight:900;
  line-height:1;
  color:var(--paper);
  background:var(--cinnabar);
  border:2px solid var(--gold);
  border-radius:2px;
  box-shadow:3px 3px 0 var(--ink);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-name{
  font-family:var(--serif);
  font-size:19px;
  font-weight:900;
  letter-spacing:.14em;
}
.brand-sub{
  font-family:var(--mono);
  font-size:10.5px;
  letter-spacing:.3em;
  color:var(--stone);
}

/* 框架式导航 */
.site-nav{margin-left:auto;}
.nav-list{display:flex;align-items:stretch;}
.nav-item{display:flex;}
.nav-link{
  display:flex;
  flex-direction:column;
  gap:.12rem;
  padding:.35rem .78rem;
  font-size:14.5px;
  font-weight:500;
  color:var(--dai);
  border-left:1px solid var(--hair);
  transition:color .18s,background-color .18s,box-shadow .18s;
}
.nav-item:last-child .nav-link{border-right:1px solid var(--hair);}
.nav-index{
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--stone);
}
.nav-link:hover{background:var(--lotus);color:var(--ink);}
.nav-link[aria-current="page"]{
  color:var(--cinnabar);
  font-weight:700;
  box-shadow:inset 0 -4px 0 var(--gold);
}
.nav-link[aria-current="page"] .nav-index{color:var(--cinnabar);}

/* 工具区 */
.header-tools{
  display:flex;
  align-items:center;
  gap:.55rem;
  margin-left:auto;
  flex:0 0 auto;
}
.utility-link{
  padding:.25rem .45rem .3rem;
  font-size:13px;
  font-weight:600;
  color:var(--dai);
  border-bottom:2px solid var(--gold);
  transition:color .18s,border-color .18s;
}
.utility-link:hover{color:var(--cinnabar);border-bottom-color:var(--cinnabar);}

/* 抽屉按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.52rem .7rem;
  color:var(--gold-light);
  background:var(--night);
  border:2px solid var(--gold);
  border-radius:2px;
}
.nav-toggle-label{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.14em;
}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  background:var(--gold-light);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:var(--gold-light);
  transition:transform .22s var(--ease);
}
.nav-toggle-bars::before{top:-5px;}
.nav-toggle-bars::after{top:5px;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg);}

/* 阅读进度 */
.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:3px;
  background:rgba(26,23,20,.07);
  pointer-events:none;
}
.scroll-progress-bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--gold),var(--proof));
}

/* ---------- 页脚：夜间宫墙 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,7vw,6rem);
  color:var(--paper);
  background:var(--night);
  border-top:6px solid var(--gold);
}
.footer-rule{
  height:4px;
  background:repeating-linear-gradient(90deg,var(--cinnabar) 0 22px,transparent 22px 44px);
}
.footer-inner{
  width:min(100% - 2rem,var(--wrap));
  margin-inline:auto;
  padding:clamp(2rem,5vw,3.4rem) 0 1.6rem;
  display:grid;
  gap:2.4rem;
  grid-template-columns:1fr;
}
@media (min-width:900px){
  .footer-inner{
    grid-template-columns:minmax(240px,1fr) minmax(0,1.7fr);
    gap:2.6rem 4rem;
  }
}
.footer-brand{display:grid;gap:.7rem;align-content:start;}
.footer-seal{
  display:grid;
  place-items:center;
  width:52px;
  height:52px;
  font-family:var(--serif);
  font-size:28px;
  font-weight:900;
  line-height:1;
  color:var(--gold-light);
  background:var(--cinnabar);
  border:2px solid var(--gold);
}
.footer-brand-line{
  margin:0;
  font-family:var(--serif);
  font-size:1.25rem;
  font-weight:900;
  letter-spacing:.16em;
}
.footer-note{
  margin:0;
  max-width:36ch;
  font-size:14px;
  line-height:1.85;
  color:rgba(246,240,227,.7);
}
.footer-nav{min-width:0;}
.footer-links{
  display:grid;
  gap:.7rem 1.6rem;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
}
.footer-link{
  display:inline-block;
  padding-bottom:.15rem;
  font-size:14.5px;
  color:rgba(246,240,227,.86);
  border-bottom:1px solid transparent;
  transition:color .18s,border-color .18s;
}
.footer-link:hover{color:var(--gold-light);border-bottom-color:var(--gold);}
.footer-meta{
  grid-column:1 / -1;
  display:grid;
  gap:.55rem;
  padding-top:1.4rem;
  border-top:1px solid rgba(212,166,74,.35);
}
.contact-line{
  margin:0;
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.03em;
  color:rgba(246,240,227,.8);
  word-break:break-word;
}
.contact-strong{color:var(--gold-light);font-weight:600;}
.contact-note{
  margin:0;
  font-size:13px;
  color:rgba(246,240,227,.62);
}
.footer-address{
  margin:0;
  font-size:13px;
  color:rgba(246,240,227,.62);
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:.6rem 1.4rem;
  align-items:center;
  justify-content:space-between;
  margin-top:.8rem;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.05em;
  color:rgba(246,240,227,.55);
}
.footer-icp,.footer-copy{margin:0;}

/* ---------- 版心与外层节奏 ---------- */
.section{padding:clamp(2.5rem,6vw,5rem) 0;}
.section--tint{
  background:var(--lotus);
  border-block:var(--frame) solid var(--ink);
}
.section--night{
  color:var(--paper);
  background:var(--dai);
  border-block:var(--frame) solid var(--ink);
}
.section--night .eyebrow{color:var(--gold-light);}
.section--night .lede{color:rgba(246,240,227,.8);}
.section-head{max-width:64ch;margin-bottom:2rem;}
.section-title{margin-bottom:.55rem;}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  margin:0 0 .7rem;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.26em;
  color:var(--cinnabar);
}
.eyebrow::before{
  content:"";
  width:26px;
  height:2px;
  background:var(--gold);
}
.lede{
  font-size:1.06rem;
  color:var(--dai);
}
.rule-gold{
  height:3px;
  background:repeating-linear-gradient(90deg,var(--gold) 0 24px,transparent 24px 48px);
  margin:2.2rem 0;
}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--stone);
  padding:1.1rem 0 0;
}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:.1rem;}
.breadcrumb-list li{display:flex;align-items:center;}
.breadcrumb-list li+li::before{
  content:"/";
  margin:0 .5rem;
  color:var(--gold);
}
.breadcrumb a{
  color:var(--dai);
  border-bottom:1px solid var(--gold);
}
.breadcrumb a:hover{color:var(--cinnabar);}
.breadcrumb-current{color:var(--cinnabar);}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:1.4rem;}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr));}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(190px,1fr));}

/* ---------- 档案卡 ---------- */
.archive-card{
  position:relative;
  padding:1.45rem 1.5rem 1.6rem;
  background:#fff;
  border:var(--frame) solid var(--ink);
  box-shadow:var(--shadow-brut);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease);
}
.archive-card::after{
  content:"";
  position:absolute;
  top:-3px;
  left:-3px;
  width:26px;
  height:26px;
  background:var(--gold);
  clip-path:polygon(0 0,100% 0,0 100%);
}
.archive-card:hover{
  transform:translate(-3px,-3px);
  box-shadow:9px 9px 0 var(--gold);
}
.card-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:.4rem 1rem;
  margin-bottom:.7rem;
}
.card-meta{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--stone);
}
.card-body{color:var(--dai);}

/* ---------- 分类标签 ---------- */
.tag-row{
  display:flex;
  flex-wrap:wrap;
  gap:.45rem;
  margin-top:1rem;
}
.tag{
  padding:.26rem .58rem;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--dai);
  background:var(--paper);
  border:1.5px solid var(--dai);
}
.tag--gold{
  color:var(--ink);
  background:var(--gold-light);
  border-color:var(--gold);
}
.tag--proof{
  color:var(--proof);
  background:#fff;
  border-color:var(--proof);
}

/* ---------- 主题筛选 ---------- */
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  gap:.5rem;
  margin:0 0 1.7rem;
}
.filter-btn{
  padding:.45rem .85rem;
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--ink);
  background:var(--paper);
  border:2px solid var(--ink);
  border-radius:2px;
  transition:background-color .18s,color .18s,border-color .18s,box-shadow .18s;
}
.filter-btn:hover{background:var(--lotus);}
.filter-btn[aria-pressed="true"]{
  color:#fff;
  background:var(--cinnabar);
  border-color:var(--cinnabar);
  box-shadow:3px 3px 0 var(--ink);
}

/* ---------- 图片容器基座 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  background:var(--lotus);
  border:var(--frame) solid var(--ink);
  box-shadow:8px 8px 0 var(--gold);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame img,
.media-frame .media-ph{aspect-ratio:16 / 10;}
.media-frame--portrait img,
.media-frame--portrait .media-ph{aspect-ratio:3 / 4;}
.media-frame--square img,
.media-frame--square .media-ph{aspect-ratio:1 / 1;}
.media-frame--wide img,
.media-frame--wide .media-ph{aspect-ratio:21 / 9;}
.media-ph{
  display:grid;
  place-items:center;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--stone);
  background-image:repeating-linear-gradient(45deg,rgba(177,58,47,.07) 0 8px,transparent 8px 16px);
}
.figure{display:grid;gap:.6rem;}
.figure-caption{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--stone);
}

/* ---------- 版本对照表 ---------- */
.table-wrap{
  overflow-x:auto;
  background:#fff;
  border:var(--frame) solid var(--ink);
}
.diff-table{
  width:100%;
  border-collapse:collapse;
  font-family:var(--mono);
  font-size:13.5px;
}
.diff-table caption{
  padding:.8rem 1rem;
  font-family:var(--sans);
  font-size:14px;
  font-weight:700;
  text-align:left;
  letter-spacing:.04em;
  background:var(--lotus);
  border-bottom:2px solid var(--gold);
}
.diff-table th,
.diff-table td{
  padding:.7rem .9rem;
  text-align:left;
  vertical-align:top;
  border-bottom:1px solid var(--hair);
}
.diff-table thead th{
  color:var(--paper);
  background:var(--dai);
  font-weight:600;
  letter-spacing:.06em;
}
.diff-table tbody tr:nth-child(even){background:rgba(232,217,192,.42);}

/* ---------- 平板与移动端 ---------- */
@media (max-width:1024px){
  .header-inner{
    flex-wrap:wrap;
    row-gap:.55rem;
    padding:.7rem 0 .75rem;
  }
  .brand{order:1;}
  .header-tools{order:2;margin-left:auto;}
  .nav-toggle{display:inline-flex;}
  .site-nav{
    order:3;
    flex:1 1 100%;
    margin-left:0;
    max-height:0;
    overflow:hidden;
    opacity:0;
    visibility:hidden;
    border-top:2px solid var(--gold);
    transition:max-height .34s var(--ease),opacity .2s ease,visibility .2s;
  }
  .site-nav[data-open]{
    max-height:min(66vh,540px);
    overflow-y:auto;
    opacity:1;
    visibility:visible;
  }
  .nav-list{flex-direction:column;}
  .nav-item{width:100%;}
  .nav-link{
    flex-direction:row;
    align-items:baseline;
    gap:.7rem;
    padding:.85rem .3rem;
    font-size:16px;
    border-left:0;
    border-bottom:1px solid var(--hair);
  }
  .nav-item:last-child .nav-link{border-right:0;}
  .nav-link[aria-current="page"]{box-shadow:inset 4px 0 0 var(--gold);}
  .nav-index{font-size:11px;}
}
@media (max-width:640px){
  body{font-size:16px;}
  .brand-seal{width:40px;height:40px;font-size:22px;}
  .brand-name{font-size:17px;letter-spacing:.1em;}
  .brand-sub{font-size:10px;letter-spacing:.22em;}
  .header-tools{gap:.4rem;}
  .utility-link{font-size:12px;padding:.2rem .25rem .25rem;border-bottom-width:1.5px;}
  .btn{padding:.5rem .7rem;font-size:12.5px;}
  .btn-seal{box-shadow:3px 3px 0 var(--ink);}
  .archive-card{padding:1.2rem 1.15rem 1.35rem;box-shadow:4px 4px 0 var(--ink);}
  .archive-card:hover{transform:none;box-shadow:4px 4px 0 var(--ink);}
  .media-frame{box-shadow:5px 5px 0 var(--gold);}
  .footer-legal{justify-content:flex-start;}
}
@media (max-width:480px){
  .utility-link{display:none;}
}

/* ---------- 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;
    scroll-behavior:auto !important;
  }
  .btn:hover,
  .archive-card:hover{transform:none;}
}