/* ============================================================
   皇家8828 — 共享样式表 /assets/site.css
   目录：1 reset 2 变量 3 基础排版 4 容器与分区
        5 页头 6 按钮 7 通用组件 8 页脚 9 状态与响应式
   ============================================================ */

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

/* ---------- 2. 变量 ---------- */
:root{
  --night:#07162B;
  --royal:#0E2A4A;
  --chart:#1C4E80;
  --jewel:#12625C;
  --gold:#D9A94A;
  --gold-soft:#F2C869;
  --amber:#FF8A1F;
  --paper:#EDE8DE;
  --steel:#9FB0C2;
  --ink:#11161C;

  --font-display:"Oswald","Arial Narrow","Helvetica Neue Condensed","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --header-h:84px;
  --header-h-sm:64px;
  --shell:1220px;
  --line:rgba(159,176,194,.28);
  --line-strong:rgba(159,176,194,.5);
  --shadow-hard:8px 8px 0 rgba(4,12,24,.55);
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  padding-top:var(--header-h);
  background:var(--night);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
html.nav-open{overflow:hidden;}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  font-stretch:75%;
  line-height:1.05;
  letter-spacing:.005em;
}
h1{font-size:clamp(2.5rem,7vw,6rem);}
h2{font-size:clamp(1.7rem,3.6vw,2.75rem);}
h3{font-size:clamp(1.15rem,1.8vw,1.5rem);line-height:1.25;}
h4{font-size:1.05rem;letter-spacing:.06em;}

.mono{font-family:var(--font-mono);letter-spacing:.02em;}

.section-title{font-size:clamp(1.7rem,3.6vw,2.75rem);}
.section-lead{font-size:17px;line-height:1.8;color:rgba(237,232,222,.78);max-width:46ch;}

.prose{font-size:17px;line-height:1.75;color:rgba(237,232,222,.86);}
.prose p{max-width:34em;}
.prose p + p{margin-top:1em;}
.prose h3{margin-top:1.6em;margin-bottom:.5em;color:var(--paper);}
.prose ul{margin:.9em 0;display:flex;flex-direction:column;gap:.45em;}
.prose li{padding-left:1.4em;position:relative;max-width:34em;}
.prose li::before{content:"";position:absolute;left:0;top:.75em;width:8px;height:2px;background:var(--gold);}
.prose a{color:var(--gold-soft);border-bottom:1px solid rgba(242,200,105,.45);}
.prose a:hover{border-bottom-color:var(--gold-soft);}
.prose strong{color:var(--paper);}

/* ---------- 4. 容器与分区 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:clamp(18px,4vw,40px);
}

.band-night,.band-royal,.band-jewel,.band-paper{
  position:relative;
  padding-block:clamp(44px,7vw,92px);
}
.band-night{background:var(--night);color:var(--paper);}
.band-royal{background:var(--royal);color:var(--paper);}
.band-jewel{background:var(--jewel);color:var(--paper);}
.band-royal,.band-jewel{border-block:1px solid rgba(159,176,194,.18);}
.band-paper{background:var(--paper);color:var(--ink);}
.band-paper .prose{color:#333A42;}
.band-paper .section-lead{color:#3E4750;}
.band-paper .section-head{border-top-color:rgba(17,22,28,.2);}
.band-paper .section-head::before{background:#B8822A;}
.band-paper .eyebrow{color:#8A6414;}
.band-paper .stat-label{color:#5A646F;}

.is-bleed{margin-top:calc(var(--header-h) * -1);}

.split-grid{
  display:grid;
  grid-template-columns:minmax(0,1.6fr) minmax(0,1fr);
  gap:clamp(22px,4vw,56px);
  align-items:start;
}
.split-main,.split-side{min-width:0;}

.content-grid{
  display:grid;
  gap:18px;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
}

/* ---------- 5. 页头 ---------- */
.skip-link{
  position:absolute;
  left:12px;
  top:-64px;
  z-index:200;
  padding:10px 16px;
  background:var(--amber);
  color:#1A1104;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  border:2px solid #1A1104;
  transition:top .18s ease;
}
.skip-link:focus{top:12px;}

.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:120;
  background-color:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .24s ease,border-color .24s ease,box-shadow .24s ease;
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(7,22,43,.94) 0%,rgba(7,22,43,.6) 58%,rgba(7,22,43,0) 100%);
  opacity:1;
  transition:opacity .24s ease;
  pointer-events:none;
}
.site-header[data-scrolled]{
  background-color:var(--royal);
  border-bottom-color:rgba(217,169,74,.45);
  box-shadow:0 14px 34px rgba(2,8,18,.55);
}
.site-header[data-scrolled]::before{opacity:0;}

.header-inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.4vw,20px);
  min-height:var(--header-h);
  padding-block:12px;
  transition:min-height .24s ease,padding .24s ease;
}
.site-header[data-scrolled] .header-inner{
  min-height:var(--header-h-sm);
  padding-block:7px;
}

.brand-link{
  flex:0 0 auto;
  display:flex;
  flex-direction:column;
  gap:1px;
  line-height:1.1;
}
.brand-mark{
  font-family:var(--font-display);
  font-weight:700;
  font-stretch:75%;
  font-size:23px;
  letter-spacing:.05em;
  color:var(--paper);
  white-space:nowrap;
}
.brand-mark::after{
  content:"";
  display:inline-block;
  width:6px;height:6px;
  margin-left:8px;
  background:var(--amber);
  vertical-align:middle;
}
.brand-tagline{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  color:var(--gold);
  white-space:nowrap;
}

.primary-nav{
  display:flex;
  align-items:center;
  gap:6px;
  flex:1 1 auto;
  min-width:0;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  flex-wrap:wrap;
}
.nav-item{flex:0 0 auto;}
.nav-link{
  position:relative;
  display:inline-block;
  padding:9px 11px;
  font-size:14px;
  letter-spacing:.09em;
  color:rgba(237,232,222,.8);
  transition:color .18s ease,background-color .18s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:11px;right:11px;bottom:3px;
  height:2px;
  background:var(--gold);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .2s ease;
}
.nav-link:hover{color:var(--gold-soft);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{
  color:var(--gold-soft);
  background-color:rgba(217,169,74,.14);
  box-shadow:inset 0 0 0 1px rgba(217,169,74,.35);
}
.nav-link[aria-current="page"]::after{transform:scaleX(1);}

.nav-aside{display:none;}

.header-utility{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
  flex:0 0 auto;
}
.version-badge{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--gold);
  background-color:rgba(217,169,74,.1);
  border:1px solid rgba(217,169,74,.5);
  padding:4px 8px;
  white-space:nowrap;
}
.update-chip{
  display:inline-flex;
  align-items:center;
  gap:7px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--steel);
  border:1px dashed rgba(159,176,194,.45);
  padding:4px 10px;
  max-width:230px;
  overflow:hidden;
  white-space:nowrap;
  transition:opacity .2s ease,max-width .24s ease,padding .24s ease,border-width .24s ease;
}
.update-chip::before{
  content:"";
  flex:0 0 auto;
  width:6px;height:6px;
  background:var(--amber);
}
.header-utility .update-chip{opacity:1;}
.site-header[data-scrolled] .header-utility .update-chip{
  opacity:0;
  max-width:0;
  padding-inline:0;
  border-width:0;
}

.nav-toggle{
  display:none;
  position:relative;
  z-index:140;
  align-items:center;
  gap:9px;
  padding:9px 12px;
  border:2px solid rgba(217,169,74,.6);
  color:var(--gold-soft);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  background-color:rgba(7,22,43,.6);
}
.nav-toggle:hover{border-color:var(--gold-soft);}
.nav-toggle-bars{display:block;}
.nav-toggle-bars span{
  display:block;
  width:20px;height:2px;
  background:var(--gold);
  transition:transform .2s ease,opacity .2s ease;
}
.nav-toggle-bars span + span{margin-top:4px;}
.nav-toggle[aria-expanded="true"]{background-color:var(--amber);color:#1A1104;border-color:#1A1104;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span{background:#1A1104;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:3px;
  background-color:rgba(159,176,194,.18);
  pointer-events:none;
}
.scroll-progress-bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--gold),var(--amber));
}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 20px;
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  letter-spacing:.06em;
  border:2px solid transparent;
  text-align:center;
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn-action{
  background-color:var(--amber);
  color:#1A1104;
  border-color:#1A1104;
  box-shadow:4px 4px 0 rgba(4,12,24,.62);
}
.btn-action:hover{
  background-color:var(--gold-soft);
  transform:translate(-2px,-2px);
  box-shadow:7px 7px 0 rgba(4,12,24,.62);
}
.btn-ghost{
  background-color:transparent;
  color:var(--paper);
  border-color:var(--line-strong);
}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold-soft);}
.header-cta{flex:0 0 auto;padding:11px 18px;}

/* ---------- 7. 通用组件 ---------- */
.breadcrumbs{padding-block:14px 4px;}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--steel);
}
.breadcrumb-item{display:inline-flex;align-items:center;}
.breadcrumb-item + .breadcrumb-item::before{
  content:"/";
  margin-inline:10px;
  color:rgba(159,176,194,.5);
}
.breadcrumb-link{color:var(--steel);border-bottom:1px solid transparent;}
.breadcrumb-link:hover{color:var(--gold-soft);border-bottom-color:rgba(242,200,105,.5);}
.breadcrumb-current{color:var(--gold);}

.section-head{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding-top:22px;
  margin-bottom:clamp(20px,3vw,34px);
  border-top:1px solid var(--line);
}
.section-head::before{
  content:"";
  position:absolute;
  top:-1px;left:0;
  width:96px;height:3px;
  background:var(--gold);
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--gold);
  text-transform:uppercase;
}
.index-num{
  align-self:flex-start;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--amber);
  border:1px solid rgba(255,138,31,.55);
  padding:2px 9px;
}

.media-frame{
  position:relative;
  border:3px solid var(--gold);
  background-color:var(--royal);
  box-shadow:var(--shadow-hard);
  overflow:hidden;
}
.media-frame:empty{
  min-height:220px;
  background-image:repeating-linear-gradient(135deg,rgba(28,78,128,.6) 0 12px,rgba(14,42,74,.72) 12px 24px);
}
.media-frame img{
  width:100%;
  height:auto;
  aspect-ratio:16 / 9;
  object-fit:cover;
}
.media-frame[data-ratio="4:3"] img{aspect-ratio:4 / 3;}
.media-frame[data-ratio="1:1"] img{aspect-ratio:1 / 1;}
.media-frame[data-ratio="3:4"] img{aspect-ratio:3 / 4;}
.media-caption{
  display:block;
  margin-top:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--steel);
}

.callout{
  border-left:4px solid var(--gold);
  background-color:rgba(217,169,74,.09);
  padding:16px 20px;
  font-size:16px;
  color:rgba(237,232,222,.9);
}
.callout p{max-width:38em;}
.band-paper .callout{color:#2F363E;background-color:rgba(184,130,42,.12);}

.tag{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  padding:3px 9px;
  border:1px solid rgba(159,176,194,.5);
  color:var(--steel);
  background-color:rgba(159,176,194,.08);
}
.tag--gold{
  border-color:rgba(217,169,74,.7);
  color:var(--gold);
  background-color:rgba(217,169,74,.12);
}
.tag--amber{
  border-color:rgba(255,138,31,.7);
  color:var(--amber);
  background-color:rgba(255,138,31,.12);
}

.stat{display:block;}
.stat-value{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(1.6rem,3vw,2.4rem);
  line-height:1.1;
  letter-spacing:.02em;
  color:var(--gold);
}
.stat-label{
  display:block;
  margin-top:6px;
  font-size:13px;
  letter-spacing:.08em;
  color:var(--steel);
}

.disclosure{
  border:2px solid rgba(159,176,194,.35);
  background-color:rgba(14,42,74,.55);
}
.disclosure + .disclosure{margin-top:12px;}
.disclosure-trigger{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:15px 18px;
  text-align:left;
  font-family:var(--font-display);
  font-size:17px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--paper);
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.disclosure-trigger:hover{background-color:rgba(28,78,128,.45);}
.disclosure-trigger[aria-expanded="true"]{
  color:var(--gold-soft);
  border-bottom:2px solid var(--gold);
}
.disclosure-icon{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:18px;
  line-height:1;
  color:var(--amber);
  transition:transform .18s ease;
}
.disclosure-trigger[aria-expanded="true"] .disclosure-icon{transform:rotate(45deg);}
.disclosure-panel{
  padding:16px 18px;
  font-size:16px;
  line-height:1.75;
  color:rgba(237,232,222,.85);
  border-top:1px solid rgba(159,176,194,.2);
}
.disclosure-panel[hidden]{display:none;}
.band-paper .disclosure{background-color:rgba(14,42,74,.04);border-color:rgba(17,22,28,.22);}
.band-paper .disclosure-trigger{color:var(--ink);}
.band-paper .disclosure-panel{color:#333A42;}

[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s ease,transform .6s ease;
}
[data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(40px,7vw,88px);
  padding-top:clamp(40px,6vw,68px);
  padding-bottom:calc(26px + env(safe-area-inset-bottom,0px));
  background-color:var(--night);
  border-top:3px solid var(--gold);
  color:var(--paper);
}
.footer-inner{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.95fr);
  gap:clamp(26px,4vw,56px);
  align-items:start;
}
.footer-brand{min-width:0;}
.footer-mark{
  display:block;
  font-family:var(--font-display);
  font-weight:700;
  font-stretch:75%;
  font-size:30px;
  letter-spacing:.05em;
  color:var(--paper);
}
.footer-tagline{
  display:block;
  margin-top:2px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.26em;
  color:var(--gold);
}
.footer-brand-note{
  margin-top:16px;
  max-width:30ch;
  font-size:14px;
  line-height:1.75;
  color:var(--steel);
}
.footer-badges{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:18px;
}
.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
}
.footer-col{min-width:0;}
.footer-col-title{
  font-family:var(--font-display);
  font-size:13px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--gold);
  padding-bottom:10px;
  margin-bottom:14px;
  border-bottom:1px solid rgba(217,169,74,.3);
}
.footer-links{display:flex;flex-direction:column;gap:10px;}
.footer-link{
  display:inline-block;
  font-size:15px;
  color:rgba(237,232,222,.78);
  transition:color .18s ease,transform .18s ease;
}
.footer-link:hover{color:var(--gold-soft);transform:translateX(3px);}

.footer-base{margin-top:clamp(28px,4vw,44px);}
.footer-closing{
  max-width:56ch;
  padding-left:14px;
  border-left:3px solid var(--amber);
  font-size:15px;
  line-height:1.7;
  color:rgba(237,232,222,.82);
}
.footer-bottom{
  margin-top:22px;
  padding-top:18px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 26px;
}
.footer-contact{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.03em;
  line-height:1.8;
  color:var(--steel);
  max-width:62ch;
}
.footer-legal{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--steel);
}

.back-top{
  position:fixed;
  right:clamp(14px,3vw,28px);
  bottom:clamp(16px,3vw,28px);
  z-index:110;
  padding:12px 18px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:#1A1104;
  background-color:var(--amber);
  border:2px solid #1A1104;
  clip-path:polygon(12% 0,100% 0,88% 100%,0 100%);
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s ease,background-color .18s ease;
}
.back-top[data-visible]{opacity:1;visibility:visible;transform:none;}
.back-top:hover{background-color:var(--gold-soft);}

/* ---------- 9. 状态与响应式 ---------- */
:focus-visible{
  outline:3px solid var(--gold-soft);
  outline-offset:3px;
}

@media (max-width:1000px){
  :root{--header-h:72px;--header-h-sm:60px;}

  .header-inner{gap:10px;}
  .header-utility{display:none;}
  .nav-toggle{display:inline-flex;margin-left:6px;}

  .primary-nav{
    position:fixed;
    top:0;right:0;bottom:0;
    width:min(88vw,380px);
    display:flex;
    flex-direction:column;
    gap:26px;
    padding:calc(var(--header-h) + 22px) 26px 40px;
    background-color:var(--night);
    border-left:3px solid var(--gold);
    box-shadow:-18px 0 40px rgba(2,8,18,.6);
    clip-path:polygon(14% 0,100% 0,100% 100%,0 100%);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateX(102%);
    transition:transform .28s ease,opacity .24s ease,visibility .24s ease;
    z-index:130;
  }
  .primary-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:translateX(0);
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    flex-wrap:nowrap;
  }
  .nav-link{
    display:block;
    padding:14px 6px 14px 14px;
    font-family:var(--font-display);
    font-size:20px;
    font-weight:700;
    letter-spacing:.08em;
    border-bottom:1px solid rgba(159,176,194,.22);
    border-left:3px solid transparent;
  }
  .nav-link::after{display:none;}
  .nav-link[aria-current="page"]{
    color:var(--gold-soft);
    background-color:rgba(217,169,74,.16);
    box-shadow:none;
    border-left-color:var(--gold);
  }
  .nav-aside{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:10px;
    margin-top:auto;
    padding-top:18px;
    border-top:1px solid rgba(159,176,194,.28);
  }
  .nav-aside .update-chip{opacity:1;max-width:none;}

  .split-grid{grid-template-columns:minmax(0,1fr);}
  .footer-inner{grid-template-columns:minmax(0,1fr);}
  .footer-nav{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));}
}

@media (max-width:620px){
  body{font-size:16px;}
  .brand-tagline{display:none;}
  .brand-mark{font-size:20px;}
  .nav-toggle-label{display:none;}
  .nav-toggle{padding:9px 10px;}
  .header-cta{padding:9px 13px;font-size:13px;box-shadow:3px 3px 0 rgba(4,12,24,.62);}
  .section-lead{font-size:16px;}
  .footer-nav{grid-template-columns:minmax(0,1fr);}
  .footer-closing{font-size:14px;}
  .back-top{padding:10px 14px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    transition-duration:.001ms !important;
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
  }
  [data-reveal]{opacity:1;transform:none;}
}