/* ============================================================
   皇冠体肓 · 共享样式表 /assets/site.css
   深青灰侧轨 + 雪白纸面 + 金红信号色
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:88px}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none!important}

/* ---------- 2. 变量 ---------- */
:root{
  --ink:#12191E;
  --ink-soft:#3C4A54;
  --deep:#1E2A32;
  --deep-2:#16202A;
  --snow:#F5F3EE;
  --sand:#D8CDB8;
  --fog:#8A9AA5;
  --gold:#C9A227;
  --gold-hi:#E7C55A;
  --saffron:#A63A2B;
  --blue:#2E5E8C;
  --jade:#2F7D6B;

  --rail-w:248px;
  --line:2px;
  --shadow:8px 8px 0 var(--deep);
  --shadow-sm:5px 5px 0 var(--deep);

  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

/* ---------- 3. 基础排版 ---------- */
@media (prefers-reduced-motion: no-preference){
  html{scroll-behavior:smooth}
}
body{
  background:var(--snow);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  min-height:100vh;
}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.18;letter-spacing:-.01em}
h1{font-size:clamp(2.2rem,6vw,4.4rem);font-weight:300;line-height:1.06}
h2{font-size:clamp(1.6rem,3.4vw,3rem);font-weight:300;line-height:1.12}
h3{font-size:clamp(1.1rem,1.8vw,1.5rem)}
h4{font-size:1.05rem}
p{margin-bottom:1.2em}
p:last-child{margin-bottom:0}
small{font-size:.8rem}
.mono{font-family:var(--font-mono);font-weight:500;letter-spacing:.02em;font-variant-numeric:tabular-nums}
.kicker{display:inline-block;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.2em;color:var(--saffron);text-transform:uppercase;font-weight:500}
.lede{font-size:clamp(1rem,1.3vw,1.15rem);line-height:1.8;color:var(--ink-soft);max-width:62ch}

:focus-visible{outline:2px solid var(--gold-hi);outline-offset:3px}

/* ---------- 4. 跳过链接 ---------- */
.skip-link{
  position:fixed;left:12px;top:-120px;z-index:200;
  background:var(--gold);color:var(--ink);
  padding:.65rem 1rem;border:2px solid var(--ink);
  font-weight:700;letter-spacing:.08em;font-size:.85rem;
  transition:top .18s ease;
}
.skip-link:focus{top:12px}

/* ---------- 5. 通用容器与布局 ---------- */
.wrap{width:100%;max-width:1440px;margin:0 auto;padding:0 20px}
.section{padding:52px 0}
.stack{display:flex;flex-direction:column;gap:16px}
.action-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.grid{display:grid;gap:24px;grid-template-columns:1fr}
@media (min-width:640px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:1024px){
  .wrap{padding:0 40px}
  .section{padding:80px 0}
  .grid--3{grid-template-columns:repeat(3,1fr)}
  .grid--4{grid-template-columns:repeat(4,1fr)}
}
@media (min-width:1440px){
  .wrap{padding:0 64px}
}

/* ---------- 6. 头部：移动端顶栏 ---------- */
.site-header{position:sticky;top:0;z-index:60}
.topbar{
  display:flex;align-items:center;gap:12px;
  background:var(--deep);color:var(--snow);
  padding:9px 16px;
  border-bottom:3px solid var(--gold);
}
.topbar__brand{
  font-size:1.02rem;font-weight:700;letter-spacing:.1em;color:var(--snow);
}
.topbar__cta{
  margin-left:auto;
  font-size:.78rem;letter-spacing:.08em;color:var(--gold-hi);
  border:1px solid rgba(231,197,90,.55);
  padding:.32rem .55rem;white-space:nowrap;
}
.topbar__cta:hover{border-color:var(--gold-hi);background:rgba(231,197,90,.12)}
.nav-toggle{
  display:inline-flex;align-items:center;gap:.5rem;
  background:var(--gold);color:var(--ink);
  border:2px solid var(--ink);
  padding:.35rem .6rem;
  font-weight:700;letter-spacing:.08em;
  transition:background .16s ease,transform .16s ease;
}
.nav-toggle:hover{background:var(--gold-hi)}
.nav-toggle[aria-expanded="true"]{background:var(--snow)}
.nav-toggle__bars{
  width:18px;height:12px;flex:none;
  background:
    linear-gradient(var(--ink),var(--ink)) 0 0/100% 2px no-repeat,
    linear-gradient(var(--ink),var(--ink)) 0 5px/100% 2px no-repeat,
    linear-gradient(var(--ink),var(--ink)) 0 10px/100% 2px no-repeat;
}
.nav-toggle__label{font-size:.8rem}

/* ---------- 7. 侧边轨道导航（移动端为抽屉） ---------- */
.nav-scrim{display:none}
.rail{
  position:fixed;top:0;left:0;bottom:0;z-index:70;
  width:min(86vw,340px);
  display:flex;flex-direction:column;gap:20px;
  padding:22px 18px 26px;
  background:var(--deep);color:var(--snow);
  border-right:3px solid var(--ink);
  overflow-y:auto;
  transform:translateX(-104%);
  transition:transform .24s cubic-bezier(.4,0,.2,1);
}
.site-header[data-open] .rail{transform:translateX(0)}
@media (max-width:1023.98px){
  .site-header[data-open] .nav-scrim{
    display:block;position:fixed;inset:0;z-index:65;
    background:rgba(18,25,30,.62);
  }
}

.rail__brand{padding-bottom:16px;border-bottom:1px solid rgba(245,243,238,.18)}
.brand{display:block}
.brand__mark{
  display:block;font-size:1.45rem;font-weight:700;
  letter-spacing:.14em;color:var(--snow);
}
.brand__mark::after{
  content:"";display:block;width:48px;height:3px;background:var(--gold);margin-top:9px;
}
.brand__tagline{
  display:block;margin-top:9px;
  font-size:.74rem;letter-spacing:.18em;color:var(--fog);
}

.rail__search{display:block}
.rail__search-label{
  display:block;margin-bottom:6px;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.18em;color:var(--gold);
}
.rail__search-input{
  width:100%;
  background:rgba(245,243,238,.06);
  border:2px solid rgba(245,243,238,.22);
  color:var(--snow);
  padding:.45rem .6rem;font-size:.86rem;
  transition:border-color .16s ease,background .16s ease;
}
.rail__search-input::placeholder{color:var(--fog)}
.rail__search-input:focus{border-color:var(--gold-hi);background:rgba(245,243,238,.1)}

.rail__nav{display:block}
.nav-list{counter-reset:nav;display:flex;flex-direction:column;gap:2px}
.nav-list li{display:block}
.nav-link{
  display:flex;align-items:baseline;gap:.7rem;
  padding:.55rem .7rem;
  color:rgba(245,243,238,.74);
  font-size:.95rem;letter-spacing:.06em;
  border-left:3px solid transparent;
  transition:background .16s ease,color .16s ease,border-color .16s ease;
}
.nav-link::before{
  counter-increment:nav;
  content:counter(nav,decimal-leading-zero);
  font-family:var(--font-mono);font-size:.7rem;font-weight:500;
  color:var(--gold);flex:none;
}
.nav-link:hover{color:var(--snow);background:rgba(245,243,238,.08);border-left-color:var(--gold-hi)}
.nav-link[aria-current="page"]{
  background:var(--gold);color:var(--ink);font-weight:700;
  border-left-color:var(--snow);
}
.nav-link[aria-current="page"]::before{color:var(--ink)}
.nav-list__empty{
  margin-top:10px;padding:.5rem .7rem;
  font-size:.78rem;color:var(--fog);
  border-left:3px dashed rgba(245,243,238,.25);
}

.rail__foot{
  margin-top:auto;padding-top:18px;
  border-top:1px solid rgba(245,243,238,.18);
  display:flex;flex-direction:column;gap:12px;
}
.rail__meta{
  margin:0;font-family:var(--font-mono);
  font-size:.68rem;letter-spacing:.14em;color:var(--fog);line-height:1.6;
}
.rail__progress{
  display:none;position:absolute;left:0;right:0;bottom:0;height:4px;
  background:rgba(245,243,238,.14);
}
.rail__progress-bar{display:block;height:100%;width:0;background:var(--gold)}

/* ---------- 8. 桌面端：固定侧轨 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .site-header{position:fixed;top:0;left:0;bottom:0;width:var(--rail-w)}
  .topbar{display:none}
  .nav-scrim{display:none!important}
  .site-header[data-open] .nav-scrim{display:none!important}
  .rail{
    position:static;transform:none;
    width:100%;height:100%;
    padding:30px 22px 26px;
    border-right:3px solid var(--ink);
  }
  .rail__progress{display:block}
}

/* ---------- 9. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.68rem 1.1rem;
  border:2px solid var(--ink);
  background:var(--snow);color:var(--ink);
  font-size:.88rem;font-weight:700;letter-spacing:.08em;
  box-shadow:var(--shadow-sm);
  transition:transform .16s ease,box-shadow .16s ease,background .16s ease,border-color .16s ease,color .16s ease;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:8px 8px 0 var(--deep)}
.btn:active{transform:translate(1px,1px);box-shadow:2px 2px 0 var(--deep)}
.btn--gold{background:var(--gold)}
.btn--gold:hover{background:var(--gold-hi)}
.btn--dark{background:var(--deep);color:var(--snow);box-shadow:5px 5px 0 var(--gold)}
.btn--dark:hover{box-shadow:8px 8px 0 var(--gold)}
.btn--ghost{
  background:transparent;color:var(--snow);
  border-color:rgba(245,243,238,.4);box-shadow:none;
}
.btn--ghost:hover{background:rgba(245,243,238,.1);border-color:var(--gold-hi);transform:none;box-shadow:none}
.btn--block{width:100%}

/* ---------- 10. 返回顶部 ---------- */
.to-top{
  position:fixed;right:18px;bottom:18px;z-index:55;
  padding:.55rem .8rem;
  background:var(--ink);color:var(--snow);
  border:2px solid var(--gold);
  font-size:.78rem;letter-spacing:.1em;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--gold);color:var(--ink);border-color:var(--ink)}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  margin-top:96px;
  background:var(--deep);color:var(--snow);
  border-top:6px solid var(--gold);
  padding-top:52px;
}
.footer__grid{
  width:100%;max-width:1440px;margin:0 auto;padding:0 20px;
  display:grid;grid-template-columns:1fr;gap:34px;
}
.footer__col{min-width:0}
.footer__col--brand{border-left:3px solid var(--gold);padding-left:16px}
.footer__brand{font-size:1.4rem;font-weight:700;letter-spacing:.14em;margin:0;color:var(--snow)}
.footer__tagline{margin:8px 0 0;font-size:.78rem;letter-spacing:.16em;color:var(--fog)}
.footer__index{margin:14px 0 0;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.12em;color:var(--gold)}
.footer__title{
  margin:0 0 12px;font-family:var(--font-mono);
  font-size:.7rem;letter-spacing:.2em;color:var(--gold);font-weight:500;
}
.footer__list{display:flex;flex-direction:column;gap:8px}
.footer__link{
  display:inline-block;
  font-size:.9rem;color:rgba(245,243,238,.76);
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:color .16s ease,border-color .16s ease;
}
.footer__link:hover{color:var(--gold-hi);border-bottom-color:var(--gold-hi)}

.footer__contact{
  width:100%;max-width:1440px;margin:44px auto 0;padding:24px 20px;
  display:grid;grid-template-columns:1fr;gap:18px;
  background:var(--deep-2);
  border-top:2px solid rgba(245,243,238,.18);
  border-bottom:2px solid rgba(245,243,238,.18);
}
.contact-item{display:flex;flex-direction:column;gap:4px;min-width:0}
.contact-item__key{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.18em;color:var(--gold)}
.contact-item__val{font-size:.92rem;color:var(--snow);word-break:break-word}
.contact-item__note{
  grid-column:1/-1;margin:6px 0 0;
  font-size:.78rem;line-height:1.7;color:var(--fog);
  border-left:3px solid var(--saffron);padding-left:12px;
}
.footer__meta{
  width:100%;max-width:1440px;margin:0 auto;padding:22px 20px 34px;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
  font-size:.78rem;color:var(--fog);
}
.footer__copy{margin:0;font-size:.78rem;color:var(--fog)}
.footer__legal{margin:0;font-family:var(--font-mono);font-size:.76rem;letter-spacing:.08em;color:var(--fog)}

@media (min-width:640px){
  .footer__grid{grid-template-columns:repeat(2,1fr);gap:34px 24px}
  .footer__col--brand{grid-column:1/-1}
  .footer__contact{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:1024px){
  .footer__grid{grid-template-columns:1.6fr repeat(4,1fr);padding:0 40px}
  .footer__col--brand{grid-column:auto}
  .footer__contact{grid-template-columns:repeat(3,1fr);padding:30px 40px}
  .footer__meta{padding:22px 40px 40px}
}
@media (min-width:1440px){
  .footer__grid,.footer__contact,.footer__meta{padding-left:64px;padding-right:64px}
}

/* ---------- 12. 章节编号 ---------- */
.section-marker{display:flex;align-items:center;gap:14px;margin-bottom:22px;flex-wrap:wrap}
.section-marker__num{
  font-family:var(--font-mono);font-weight:500;line-height:1;
  font-size:clamp(1.6rem,2.6vw,2.4rem);color:var(--gold);
}
.section-marker__line{width:48px;height:3px;background:var(--gold);flex:none}
.section-marker__title{font-size:clamp(1.15rem,1.8vw,1.6rem);font-weight:700;letter-spacing:.02em}

/* ---------- 13. 卡片与面板 ---------- */
.card{
  display:flex;flex-direction:column;gap:12px;
  padding:22px;
  background:var(--snow);
  border:2px solid var(--ink);
  box-shadow:var(--shadow);
  transition:transform .18s ease,box-shadow .18s ease;
}
.card:hover{transform:translate(-2px,-2px) rotate(-.35deg);box-shadow:11px 11px 0 var(--deep)}
.card--sand{background:var(--sand)}
.card--deep{background:var(--deep);color:var(--snow)}
.card__label{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.2em;
  color:var(--saffron);text-transform:uppercase;font-weight:500;
}
.card--deep .card__label{color:var(--gold-hi)}
.card__title{font-size:1.15rem;font-weight:700;line-height:1.3}
.card__text{font-size:.92rem;line-height:1.7;color:var(--ink-soft)}
.card--deep .card__text{color:rgba(245,243,238,.78)}

.panel{background:var(--snow);border:2px solid var(--ink);box-shadow:var(--shadow);padding:26px}
.panel--sand{background:var(--sand)}
.panel--deep{background:var(--deep);color:var(--snow);border-color:var(--ink)}
.panel--deep .lede{color:rgba(245,243,238,.8)}

/* ---------- 14. 索引列表 ---------- */
.index-list{border-top:2px solid var(--ink)}
.index-row{
  display:grid;grid-template-columns:auto 1fr;gap:6px 16px;
  align-items:baseline;
  padding:14px 2px;
  border-bottom:1px solid rgba(18,25,30,.22);
}
.index-row__no{font-family:var(--font-mono);font-size:.82rem;color:var(--gold);letter-spacing:.06em;font-weight:500}
.index-row__title{font-size:.98rem;font-weight:500}
.index-row__meta{grid-column:2;font-family:var(--font-mono);font-size:.72rem;color:var(--ink-soft);letter-spacing:.06em}

/* ---------- 15. 筛选 ---------- */
.filter-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  padding:14px 0;margin-bottom:28px;
  border-top:2px solid var(--ink);border-bottom:2px solid var(--ink);
}
.filter-btn{
  background:var(--snow);border:2px solid var(--ink);
  padding:.4rem .85rem;
  font-size:.82rem;font-weight:500;letter-spacing:.08em;
  transition:background .16s ease,color .16s ease,transform .16s ease;
}
.filter-btn:hover{background:var(--sand);transform:translateY(-1px)}
.filter-btn[aria-pressed="true"]{background:var(--deep);color:var(--snow)}
.filter-count{margin-left:auto;font-family:var(--font-mono);font-size:.75rem;letter-spacing:.08em;color:var(--ink-soft)}

/* ---------- 16. 标签与状态点 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.12em;font-weight:500;
  padding:.18rem .5rem;border:2px solid currentColor;background:transparent;
}
.tag--gold{color:#8A6F14;border-color:var(--gold);background:rgba(201,162,39,.14)}
.tag--saffron{color:var(--saffron);border-color:var(--saffron);background:rgba(166,58,43,.1)}
.tag--blue{color:var(--blue);border-color:var(--blue);background:rgba(46,94,140,.1)}
.tag--jade{color:var(--jade);border-color:var(--jade);background:rgba(47,125,107,.1)}
.status-dot{
  display:inline-block;width:9px;height:9px;flex:none;
  border:2px solid var(--ink);background:var(--jade);vertical-align:middle;
}
.status-dot--gold{background:var(--gold)}
.status-dot--saffron{background:var(--saffron)}

/* ---------- 17. 图像容器（页面阶段放占位图） ---------- */
.media{
  position:relative;overflow:hidden;
  background:var(--deep-2);
  border:2px solid var(--ink);
  box-shadow:var(--shadow);
}
.media > img{width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--pattern{
  background-image:repeating-linear-gradient(135deg,
    rgba(201,162,39,.22) 0 10px,
    rgba(46,94,140,.16) 10px 20px,
    rgba(166,58,43,.14) 20px 30px);
}
.media__cap{
  position:absolute;left:0;bottom:0;
  padding:.4rem .7rem;
  background:var(--deep);color:var(--snow);
  border-top:2px solid var(--gold);border-right:2px solid var(--gold);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;
}

/* ---------- 18. 面包屑 ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin-bottom:18px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;color:var(--fog);
}
.crumbs__item{color:var(--blue)}
.crumbs__item:hover{color:var(--saffron)}
.crumbs__sep{color:var(--fog)}

/* ---------- 19. 进场动效 ---------- */
html[data-js="on"] [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .5s ease,transform .5s ease;
}
html[data-js="on"] [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 20. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  html[data-js="on"] [data-reveal]{opacity:1;transform:none}
  .card:hover{transform:none}
  .btn:hover{transform:none}
  .filter-btn:hover{transform:none}
  .to-top{transition:opacity .001ms linear,visibility .001ms linear}
}