/* ============================================================
   九五至尊3官网 · 共享站点样式 /assets/site.css
   玄黑 · 鎏金 · 朱砂 · 青灰蓝 ／ 数字礼制档案馆
   ============================================================ */

/* ---------- 1. Tokens ---------- */
:root{
  --ink:#0B0B0D;
  --ink-2:#16171B;
  --ink-3:#1A1B20;
  --gold:#C8A45C;
  --gold-bright:#E8CC8A;
  --cinnabar:#C53A2F;
  --cinnabar-deep:#A92F26;
  --slate:#5E7A8A;
  --deep-teal:#21333B;
  --archive:#8B9099;
  --paper:#F4EFE4;
  --compat:#4F7A5A;

  --line:rgba(200,164,92,.28);
  --line-strong:rgba(200,164,92,.55);
  --line-soft:rgba(200,164,92,.16);

  --font-serif:"Noto Serif SC","Songti SC",STSong,"Source Han Serif SC",serif;
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono",SFMono-Regular,Menlo,Consolas,monospace;

  --shell:1240px;
  --gutter:clamp(1rem,4vw,3rem);
  --radius:2px;

  --ease:cubic-bezier(.3,.7,.3,1);
  --dur:200ms;
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:1.25rem;
}
body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:clamp(1rem,.955rem + .18vw,1.0625rem);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-serif);
  font-weight:800;
  line-height:1.12;
  letter-spacing:-.012em;
  color:var(--paper);
}
p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img,svg,picture,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,select,textarea{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}
hr{border:0}

/* ---------- 3. Focus & accessibility ---------- */
:focus-visible{
  outline:2px solid var(--gold-bright);
  outline-offset:3px;
  border-radius:var(--radius);
}
:focus:not(:focus-visible){outline:none}
.visually-hidden{
  position:absolute !important;
  width:1px;height:1px;
  margin:-1px;padding:0;border:0;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  overflow:hidden;white-space:nowrap;
}
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-5rem;
  z-index:200;
  display:inline-block;
  padding:.6rem 1.1rem;
  background:var(--gold);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.08em;
  border-radius:var(--radius);
  transition:top var(--dur) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{top:.75rem}

/* ---------- 4. Layout shell ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

/* ---------- 5. Scroll progress ---------- */
.scroll-progress{
  position:fixed;
  inset:0 0 auto 0;
  height:2px;
  z-index:120;
  pointer-events:none;
  background:linear-gradient(90deg,var(--gold) 0%,var(--gold-bright) 62%,var(--cinnabar) 100%);
  transform:scaleX(0);
  transform-origin:0 50%;
  will-change:transform;
}

/* ============================================================
   6. HEADER
   ============================================================ */
.site-header{
  position:relative;
  z-index:80;
  background:var(--ink);
  color:var(--paper);
  border-bottom:1px solid var(--line-strong);
}

/* 6.1 元信息层 */
.header-meta{
  background:var(--deep-teal);
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.07em;
}
.header-meta__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.35rem 1.75rem;
  padding-block:.5rem;
  min-height:2.3rem;
}
.header-meta__brand{color:var(--gold-bright)}
.header-meta__note{color:rgba(244,239,228,.74)}
.header-meta__icp{margin-left:auto;color:rgba(244,239,228,.55)}

/* 6.2 品牌行 */
.header-main{background:var(--ink)}
.header-main__inner{
  display:flex;
  align-items:center;
  gap:1rem;
  padding-block:1rem;
}
.brand{
  order:1;
  display:inline-flex;
  align-items:center;
  gap:.8rem;
  margin-right:auto;
  color:var(--paper);
  text-decoration:none;
}
.brand__seal{
  display:grid;
  place-items:center;
  flex:0 0 auto;
  width:2.55rem;
  height:2.55rem;
  background:var(--gold);
  color:var(--ink);
  font-family:var(--font-serif);
  font-weight:900;
  font-size:1.1rem;
  line-height:1;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%);
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.brand:hover .brand__seal{background:var(--gold-bright)}
.brand__text{display:flex;flex-direction:column;line-height:1.16}
.brand__name{
  font-family:var(--font-serif);
  font-weight:900;
  font-size:clamp(1.15rem,2.4vw,1.4rem);
  letter-spacing:.03em;
}
.brand__sub{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.17em;
  color:var(--archive);
}

/* 6.3 桌面端固定入口 */
.header-cta{
  order:2;
  display:none;
  align-items:center;
  padding:.58rem 1rem;
  border:1px solid var(--line-strong);
  color:var(--gold-bright);
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.1em;
  white-space:nowrap;
  background:transparent;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%);
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.header-cta:hover{background:var(--gold);color:var(--ink)}

/* 6.4 移动端目录按钮 */
.nav-toggle{
  order:3;
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  padding:.55rem .8rem;
  border:1px solid var(--line-strong);
  color:var(--gold);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle__bars{
  display:block;
  width:18px;
  height:12px;
  color:var(--gold);
  background:
    linear-gradient(currentColor,currentColor) 0 0/100% 2px no-repeat,
    linear-gradient(currentColor,currentColor) 0 50%/100% 2px no-repeat,
    linear-gradient(currentColor,currentColor) 0 100%/100% 2px no-repeat;
  transition:color var(--dur) var(--ease);
}
.nav-toggle__label{line-height:1}
.nav-toggle:hover{background:rgba(200,164,92,.12);color:var(--gold-bright)}
.nav-toggle[aria-expanded="true"]{
  background:rgba(200,164,92,.16);
  color:var(--gold-bright);
}
.site-header[data-open="true"] .nav-toggle__bars{color:var(--gold-bright)}

/* 6.5 编号目录层 */
.header-nav-group{
  background:var(--ink-2);
  border-top:1px solid var(--line-strong);
}
.site-nav{position:relative}
.site-nav__inner{overflow:hidden}
.site-nav__list{
  display:flex;
  flex-wrap:wrap;
  align-items:stretch;
  row-gap:0;
}
.site-nav__item{display:flex}
.site-nav__link{
  display:flex;
  align-items:baseline;
  gap:.5rem;
  padding:.78rem .95rem .82rem;
  color:var(--paper);
  font-size:.93rem;
  line-height:1.35;
  white-space:nowrap;
  border-bottom:2px solid transparent;
  background:transparent;
  transition:color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),
             background-color var(--dur) var(--ease);
}
.site-nav__num{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--gold);
  transition:color var(--dur) var(--ease);
}
.site-nav__label{display:inline-block}
.site-nav__link:hover{
  color:var(--gold-bright);
  border-bottom-color:var(--gold);
  background:rgba(200,164,92,.06);
}
.site-nav__link:hover .site-nav__num{color:var(--gold-bright)}
.site-nav__link[aria-current="page"]{
  color:var(--gold-bright);
  border-bottom-color:var(--gold-bright);
  background:linear-gradient(180deg,rgba(200,164,92,.16),rgba(200,164,92,0));
}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--gold-bright)}

/* ============================================================
   7. FOOTER
   ============================================================ */
.site-footer{
  margin-top:clamp(3rem,8vw,6rem);
  background:var(--ink-2);
  border-top:1px solid var(--line-strong);
  color:var(--paper);
}
.footer-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:2rem;
  padding-block:clamp(2rem,5vw,3.25rem);
}
.footer-col{min-width:0}
.footer-col__title{
  margin-bottom:.9rem;
  padding-bottom:.55rem;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:500;
  letter-spacing:.2em;
  color:var(--gold);
}

/* 7.1 栏目索引 */
.footer-index{display:grid;gap:.05rem}
.footer-index__link{
  display:flex;
  align-items:baseline;
  gap:.6rem;
  padding:.3rem 0 .3rem .01rem;
  border-left:1px solid transparent;
  color:rgba(244,239,228,.82);
  font-size:.92rem;
  transition:color var(--dur) var(--ease),
             padding-left var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.footer-index__num{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.06em;
  color:var(--slate);
  transition:color var(--dur) var(--ease);
}
.footer-index__link:hover{
  color:var(--gold-bright);
  padding-left:.55rem;
  border-left-color:var(--gold);
}
.footer-index__link:hover .footer-index__num{color:var(--gold)}

/* 7.2 联络 */
.footer-contact{display:grid;gap:.85rem}
.footer-contact__row{display:grid;gap:.1rem}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:.67rem;
  letter-spacing:.15em;
  color:var(--archive);
}
.footer-contact__value{
  margin:0;
  font-size:.94rem;
  line-height:1.6;
  color:rgba(244,239,228,.9);
  overflow-wrap:anywhere;
}

/* 7.3 备案与条款 */
.footer-legal{display:grid;gap:.4rem;margin-bottom:1rem}
.footer-legal__link{
  display:inline-block;
  font-size:.92rem;
  color:rgba(244,239,228,.82);
  border-bottom:1px solid var(--line-soft);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-legal__link:hover{
  color:var(--gold-bright);
  border-bottom-color:var(--gold-bright);
}
.footer-legal__icp{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.06em;
  color:var(--slate);
}

/* 7.4 收藏引导 */
.footer-col--save{
  padding:1.15rem 1.2rem 1.3rem;
  background:var(--deep-teal);
  border:1px solid rgba(94,122,138,.5);
  clip-path:polygon(0 0,calc(100% - 16px) 0,100% 16px,100% 100%,0 100%);
}
.footer-col--save .footer-col__title{
  border-bottom-color:rgba(94,122,138,.6);
  color:var(--gold-bright);
}
.footer-save__text{
  margin-bottom:1.05rem;
  font-size:.92rem;
  line-height:1.7;
  color:rgba(244,239,228,.86);
}

/* 7.5 版权条 */
.footer-base{
  background:var(--ink);
  border-top:1px solid var(--line);
}
.footer-base__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:.4rem 1.5rem;
  padding-block:1.1rem;
  font-family:var(--font-mono);
  font-size:.71rem;
  letter-spacing:.05em;
  color:var(--archive);
}
.footer-base__copy{color:rgba(244,239,228,.74)}
.footer-base__note{max-width:54ch;text-align:right}

/* ============================================================
   8. 通用按钮
   ============================================================ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45rem;
  padding:.7rem 1.15rem;
  font-family:var(--font-mono);
  font-size:.77rem;
  letter-spacing:.1em;
  line-height:1.2;
  border:1px solid transparent;
  border-radius:var(--radius);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:background-color var(--dur) var(--ease),
             color var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.btn--gold{background:var(--gold);color:var(--ink)}
.btn--gold:hover{background:var(--gold-bright);color:var(--ink)}
.btn--ghost{border-color:var(--gold);background:transparent;color:var(--gold-bright)}
.btn--ghost:hover{background:rgba(200,164,92,.14);color:var(--gold-bright)}
.btn--cinnabar{background:var(--cinnabar);color:var(--paper)}
.btn--cinnabar:hover{background:var(--cinnabar-deep);color:var(--paper)}

/* ============================================================
   9. 面包屑
   ============================================================ */
.breadcrumb{
  padding-block:.9rem;
  border-bottom:1px solid var(--line);
}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem;
  font-family:var(--font-mono);
  font-size:.71rem;
  letter-spacing:.06em;
  color:var(--archive);
}
.breadcrumb__list li{display:inline-flex;align-items:center;gap:.45rem}
.breadcrumb__list li:not(:first-child)::before{
  content:"/";
  color:rgba(200,164,92,.5);
}
.breadcrumb__link{
  color:rgba(244,239,228,.75);
  transition:color var(--dur) var(--ease);
}
.breadcrumb__link:hover{color:var(--gold-bright)}
.breadcrumb__current{color:var(--gold-bright)}

/* ============================================================
   10. 章节与正文容器
   ============================================================ */
.section{padding-block:clamp(2.25rem,5.5vw,4.25rem)}
.section__head{
  display:grid;
  gap:.6rem;
  max-width:72ch;
  margin-bottom:clamp(1.4rem,3vw,2.4rem);
}
.section__title{font-size:clamp(1.55rem,3.4vw,2.4rem)}
.section__lead{
  max-width:62ch;
  font-size:1rem;
  line-height:1.78;
  color:rgba(244,239,228,.8);
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:.71rem;
  letter-spacing:.22em;
  color:var(--gold);
}
.num{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--gold);
}
.prose{
  display:grid;
  gap:1rem;
  max-width:68ch;
  font-size:1.01rem;
  line-height:1.8;
}
.prose h2{
  margin-top:1.6rem;
  font-size:clamp(1.28rem,2.4vw,1.72rem);
}
.prose h3{
  margin-top:1.2rem;
  font-size:1.12rem;
}
.prose p{color:rgba(244,239,228,.88)}
.prose ul,.prose ol{
  display:grid;
  gap:.4rem;
  padding-left:1.15rem;
  list-style:disc;
  color:rgba(244,239,228,.88);
}
.prose ol{list-style:decimal}
.prose li{padding-left:.15rem}
.prose strong{color:var(--gold-bright);font-weight:700}
.prose a{
  color:var(--gold-bright);
  text-decoration:underline;
  text-underline-offset:.26em;
  text-decoration-thickness:1px;
  text-decoration-color:rgba(200,164,92,.5);
  transition:text-decoration-color var(--dur) var(--ease);
}
.prose a:hover{text-decoration-color:var(--gold-bright)}
.link-gold{
  color:var(--gold-bright);
  border-bottom:1px solid rgba(200,164,92,.42);
  transition:border-color var(--dur) var(--ease);
}
.link-gold:hover{border-bottom-color:var(--gold-bright)}

/* ============================================================
   11. 网格与卡片
   ============================================================ */
.grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(1rem,2vw,1.5rem);
}
.card{
  display:grid;
  align-content:start;
  gap:.55rem;
  padding:clamp(1rem,2vw,1.45rem);
  background:var(--ink-2);
  border:1px solid rgba(200,164,92,.2);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 14px),calc(100% - 14px) 100%,0 100%);
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.card:hover{
  border-color:var(--gold);
  background:var(--ink-3);
}
.panel{
  padding:clamp(1rem,2vw,1.45rem);
  background:var(--deep-teal);
  border:1px solid rgba(94,122,138,.5);
  clip-path:polygon(0 0,calc(100% - 14px) 0,100% 14px,100% 100%,0 100%);
}

/* ============================================================
   12. 状态标签
   ============================================================ */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.18rem .5rem;
  border:1px solid currentColor;
  border-radius:var(--radius);
  font-family:var(--font-mono);
  font-size:.67rem;
  letter-spacing:.1em;
  line-height:1.5;
  white-space:nowrap;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.tag--compat{color:#93C7A2;background:rgba(79,122,90,.22)}
.tag--pending{color:#F0A79F;background:rgba(197,58,47,.2)}
.tag--archived{color:#AAC3CF;background:rgba(94,122,138,.2)}
.tag--legacy{color:#AAC3CF;background:rgba(33,51,59,.8);border-color:rgba(94,122,138,.6)}

/* ============================================================
   13. 分隔线
   ============================================================ */
.divider{
  height:0;
  border:0;
  border-top:1px solid var(--line);
  margin-block:clamp(1.4rem,3vw,2.4rem);
}

/* ============================================================
   14. 图片容器基础规则（页面阶段填入占位素材）
   ============================================================ */
.img-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid rgba(200,164,92,.26);
  background:
    repeating-linear-gradient(135deg,rgba(200,164,92,.07) 0 1px,transparent 1px 14px),
    var(--ink-2);
  clip-path:polygon(0 0,calc(100% - 18px) 0,100% 18px,100% 100%,0 100%);
}
.img-frame > img,
.img-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.img-frame--wide{aspect-ratio:21/9}
.img-frame--square{aspect-ratio:1/1}
.img-frame--tall{aspect-ratio:3/4}
.img-frame--legacy{
  border-color:rgba(94,122,138,.55);
  background:
    repeating-linear-gradient(135deg,rgba(94,122,138,.14) 0 1px,transparent 1px 14px),
    var(--deep-teal);
}
.media-figure{
  display:grid;
  gap:.55rem;
  margin:0;
  min-width:0;
}
.media-figure__caption{
  font-family:var(--font-mono);
  font-size:.71rem;
  letter-spacing:.05em;
  line-height:1.6;
  color:var(--archive);
}

/* ============================================================
   15. 响应式
   ============================================================ */
@media (min-width:640px){
  .grid--2,
  .grid--3,
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (min-width:700px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:2.25rem}
}

@media (min-width:901px){
  .header-cta{display:inline-flex}
  .nav-toggle{display:none}
  .site-nav__list{flex-wrap:wrap}
}

@media (max-width:900px){
  /* 移动端目录抽屉 */
  .site-nav{
    display:grid;
    grid-template-rows:0fr;
    transition:grid-template-rows 240ms var(--ease);
  }
  .site-header[data-open="true"] .site-nav{grid-template-rows:1fr}
  .site-nav__inner{overflow:hidden}
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    padding-block:.35rem;
  }
  .site-nav__link{
    width:100%;
    padding:.85rem .25rem .85rem .8rem;
    white-space:normal;
    border-bottom:1px solid var(--line-soft);
    border-left:2px solid transparent;
  }
  .site-nav__link[aria-current="page"]{
    border-bottom-color:var(--line-soft);
    border-left-color:var(--gold-bright);
    background:linear-gradient(90deg,rgba(200,164,92,.16),rgba(200,164,92,0));
  }
  .header-meta__icp{margin-left:0}
  .footer-base__note{text-align:left}
  .footer-col--save{margin-top:.25rem}
}

@media (min-width:980px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
}

@media (min-width:1000px){
  .footer-grid{grid-template-columns:1.15fr 1.2fr .85fr 1fr;gap:2rem}
  .header-main__inner{padding-block:1.15rem}
  .site-nav__link{padding:.85rem 1.05rem .9rem}
}

@media (max-width:420px){
  .header-meta__note{display:none}
  .brand__sub{letter-spacing:.1em}
}

/* ============================================================
   16. 减少动态效果
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  .scroll-progress{transition:none}
}

/* ============================================================
   17. 打印
   ============================================================ */
@media print{
  body{background:#FFFFFF;color:#111111}
  .site-header,.site-footer,.scroll-progress,.skip-link,.nav-toggle{display:none !important}
  .prose,.prose p,.prose li{color:#111111}
  a{text-decoration:none;color:#111111}
}