/* ==========================================================================
   盛兴品牌 · 中国区站点 V1
   共享样式表 /assets/site.css
   奶油纸底 · 红土赭主色 · 湖青与暖金点缀 · 堆叠面板与坐标刻度
   ========================================================================== */

:root{
  --clay:#8E442F;
  --clay-deep:#6E3323;
  --ink:#211714;
  --cream:#F4ECDD;
  --mist:#E6E1D6;
  --lake:#2E6E74;
  --lake-deep:#1E4F54;
  --lake-pale:#9BC0BD;
  --gold:#C59A4A;
  --gold-deep:#6A4E18;
  --terra:#C98263;
  --line:#7D6E61;
  --night:#14292C;
  --paper-shadow:#D9CDBB;

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

  --shell:1320px;
  --gutter:clamp(16px,4vw,48px);
  --radius-lg:28px;
  --radius-md:18px;
  --radius-pill:999px;
  --hair:1px solid rgba(125,110,97,.32);
  --hair-light:1px solid rgba(230,225,214,.16);
}

/* ---------- 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;
  background:var(--cream);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.8;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
img,svg,video{max-width:100%;display:block;}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.28;
  letter-spacing:.01em;
  margin:0 0 .6em;
  color:var(--ink);
}
h1{font-size:clamp(2.4rem,5.2vw,4rem);}
h2{font-size:clamp(1.7rem,3vw,2.4rem);}
h3{font-size:clamp(1.2rem,1.9vw,1.5rem);}
p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}
a{color:inherit;}
ul,ol{margin:0;}
strong{font-weight:700;}
code,kbd,samp{font-family:var(--font-mono);font-size:.92em;}
hr{border:0;height:1px;background:rgba(125,110,97,.28);margin:0;}
::selection{background:var(--terra);color:var(--ink);}
:focus-visible{outline:2px solid var(--lake);outline-offset:3px;}
#main-content{display:block;scroll-margin-top:96px;}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:0;
  left:50%;
  z-index:999;
  transform:translate(-50%,-160%);
  padding:12px 24px;
  background:var(--ink);
  color:var(--cream);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  text-decoration:none;
  border-radius:0 0 var(--radius-pill) var(--radius-pill);
  transition:transform .22s ease;
}
.skip-link:focus{transform:translate(-50%,0);}

/* ==========================================================================
   头部：左端品牌 · 中段刻度 · 右端栏目索引
   ========================================================================== */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(244,236,221,.94);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  border-bottom:var(--hair);
}
.header-rail{
  position:relative;
  max-width:var(--shell);
  margin-inline:auto;
  padding:12px var(--gutter);
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,26px);
}
.header-brand{flex:none;}

.brand-mark{
  display:inline-flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:var(--ink);
}
.brand-mark__glyph{
  display:grid;
  place-items:center;
  width:40px;
  height:40px;
  flex:none;
  background:var(--clay);
  color:var(--cream);
  border-radius:13px;
  font-family:var(--font-display);
  font-weight:800;
  font-size:19px;
  line-height:1;
  box-shadow:0 8px 16px -12px rgba(142,68,47,.95);
  transition:transform .2s ease,background-color .2s ease;
}
.brand-mark:hover .brand-mark__glyph,
.brand-mark:focus-visible .brand-mark__glyph{
  transform:translateY(-2px);
  background:var(--clay-deep);
}
.brand-mark__text{display:flex;flex-direction:column;line-height:1.12;}
.brand-mark__name{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:700;
  letter-spacing:.12em;
}
.brand-mark__edition{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--line);
  white-space:nowrap;
}

.header-rule{
  flex:1 1 40px;
  display:flex;
  align-items:center;
  gap:10px;
  min-width:24px;
}
.header-rule__line{
  flex:1 1 auto;
  height:1px;
  background-image:repeating-linear-gradient(90deg,rgba(125,110,97,.6) 0 6px,transparent 6px 12px);
}
.header-rule__tick{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  color:var(--line);
  white-space:nowrap;
}

.site-nav{flex:none;display:flex;align-items:center;}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}
.site-nav__link{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:8px 12px;
  border-radius:var(--radius-pill);
  color:var(--ink);
  text-decoration:none;
  font-size:14.5px;
  line-height:1.2;
  white-space:nowrap;
  transition:background-color .2s ease,color .2s ease;
}
.site-nav__label{display:inline-block;font-weight:500;}
.site-nav__idx{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.06em;
  color:var(--line);
  transition:color .2s ease;
}
.site-nav__link:hover{background:rgba(197,154,74,.20);}
.site-nav__link:hover .site-nav__idx{color:var(--clay);}
.site-nav__link[aria-current="page"]{background:var(--clay);color:var(--cream);}
.site-nav__link[aria-current="page"] .site-nav__idx{color:rgba(244,236,221,.74);}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:10px 18px 10px 14px;
  background:var(--ink);
  color:var(--cream);
  border:0;
  border-radius:var(--radius-pill);
  font-family:var(--font-body);
  font-size:14px;
  line-height:1;
  cursor:pointer;
  transition:background-color .2s ease;
}
.nav-toggle:hover{background:var(--clay);}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:16px;}
.nav-toggle__bars span{
  display:block;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .24s ease,opacity .24s ease;
}
.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);}
.nav-toggle__text{letter-spacing:.14em;}

.header-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  pointer-events:none;
}
.header-progress span{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--clay),var(--gold));
  transition:width .12s linear;
}

/* ==========================================================================
   页脚：夜墨青面板
   ========================================================================== */
.site-footer{
  background:var(--night);
  color:var(--mist);
  margin-top:clamp(56px,8vw,120px);
}
.footer-inner{
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(40px,6vw,76px) var(--gutter) 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.35fr;
  gap:clamp(24px,3vw,48px);
}
.footer-brand__title{
  font-family:var(--font-display);
  font-size:clamp(1.5rem,2.6vw,2rem);
  font-weight:700;
  letter-spacing:.1em;
  color:var(--cream);
  margin:0 0 10px;
}
.footer-brand__line{
  font-size:15px;
  line-height:1.75;
  color:rgba(230,225,214,.74);
  margin:0 0 14px;
  max-width:24ch;
}
.footer-brand__edition{
  display:inline-block;
  margin:0;
  padding:4px 12px;
  border:1px solid rgba(197,154,74,.45);
  border-radius:var(--radius-pill);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  color:var(--gold);
}
.footer-col__heading{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--lake-pale);
}
.footer-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:1px;
}
.footer-list a{
  display:inline-block;
  padding:5px 0;
  font-size:15px;
  color:rgba(230,225,214,.82);
  text-decoration:none;
  transition:color .2s ease,transform .2s ease;
}
.footer-list a:hover,.footer-list a:focus-visible{
  color:var(--cream);
  transform:translateX(3px);
}
.footer-contact__item{
  margin:0 0 12px;
  font-size:14.5px;
  line-height:1.7;
  color:rgba(230,225,214,.86);
  word-break:break-word;
}
.footer-contact__label{
  display:block;
  margin-bottom:1px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:rgba(155,192,189,.85);
}
.footer-contact__note{
  margin:14px 0 0;
  padding-top:12px;
  border-top:var(--hair-light);
  font-size:12.5px;
  line-height:1.75;
  color:rgba(230,225,214,.58);
}
.footer-bottom{
  margin-top:clamp(32px,5vw,56px);
  border-top:var(--hair-light);
  padding:20px 0 30px;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:rgba(230,225,214,.6);
}
.footer-bottom__meta{margin:0;}
.footer-bottom__links{display:flex;flex-wrap:wrap;gap:18px;}
.footer-bottom__links a{
  color:rgba(230,225,214,.78);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer-bottom__links a:hover,.footer-bottom__links a:focus-visible{
  color:var(--gold);
  border-bottom-color:rgba(197,154,74,.65);
}

/* ==========================================================================
   通用容器与网格
   ========================================================================== */
.container{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.container--narrow{max-width:860px;}
.section{padding-block:clamp(48px,7vw,104px);}
.section--tight{padding-block:clamp(28px,4vw,56px);}

.grid{
  display:grid;
  gap:clamp(16px,2.4vw,32px);
}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,5fr);}
.grid--split-reverse{grid-template-columns:minmax(0,5fr) minmax(0,7fr);}

.stack > * + *{margin-top:var(--stack-gap,1rem);}

.hairline{
  height:1px;
  border:0;
  background-image:repeating-linear-gradient(90deg,rgba(125,110,97,.55) 0 7px,transparent 7px 14px);
}

/* ==========================================================================
   面板（专题研究板）
   ========================================================================== */
.panel{
  position:relative;
  background:var(--mist);
  border:var(--hair);
  border-radius:var(--radius-lg);
  padding:clamp(22px,3.4vw,44px);
}
.panel--paper{background:var(--cream);}
.panel--night{background:var(--night);border-color:rgba(230,225,214,.16);color:var(--mist);}
.panel--night h2,.panel--night h3{color:var(--cream);}
.panel--clay{background:var(--clay);border-color:rgba(244,236,221,.22);color:var(--cream);}
.panel--clay h2,.panel--clay h3{color:var(--cream);}
.panel--offset{box-shadow:12px 12px 0 var(--paper-shadow);}
.panel--night.panel--offset{box-shadow:12px 12px 0 rgba(217,205,187,.5);}

/* ==========================================================================
   文本组件
   ========================================================================== */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--clay);
}
.eyebrow::before{
  content:"";
  width:20px;
  height:1px;
  flex:none;
  background:var(--gold);
}
.eyebrow--muted{color:var(--line);}
.eyebrow--light{color:var(--gold);}

.index-num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(28px,4vw,44px);
  font-weight:400;
  line-height:1;
  letter-spacing:-.02em;
  color:rgba(125,110,97,.42);
}

.lede{
  font-size:clamp(1.02rem,1.4vw,1.16rem);
  line-height:1.85;
  color:rgba(33,23,20,.82);
  max-width:60ch;
}

.prose{max-width:74ch;color:var(--ink);}
.prose p{margin:0 0 1.05em;}
.prose h2{
  font-size:clamp(1.5rem,2.4vw,2rem);
  margin:1.8em 0 .55em;
}
.prose h3{
  font-size:clamp(1.12rem,1.8vw,1.32rem);
  margin:1.4em 0 .4em;
}
.prose ul,.prose ol{padding-left:1.35em;margin:0 0 1.05em;}
.prose li + li{margin-top:.4em;}
.prose strong{color:var(--clay);}
.prose blockquote{
  margin:1.4em 0;
  padding:6px 0 6px 20px;
  border-left:3px solid var(--gold);
  color:rgba(33,23,20,.78);
  font-style:normal;
}

/* ==========================================================================
   按钮与链接
   ========================================================================== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 26px;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  font-family:var(--font-body);
  font-size:15px;
  font-weight:600;
  line-height:1.2;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s ease,background-color .18s ease,color .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.btn:hover{transform:translateY(-2px);}
.btn--solid{
  background:var(--clay);
  color:var(--cream);
  box-shadow:0 12px 24px -18px rgba(142,68,47,.95);
}
.btn--solid:hover{background:var(--clay-deep);}
.btn--ghost{
  background:transparent;
  color:var(--ink);
  border-color:rgba(125,110,97,.5);
}
.btn--ghost:hover{border-color:var(--clay);color:var(--clay);}
.btn--gold{background:var(--gold);color:var(--ink);}
.btn--gold:hover{background:#D2A957;}
.btn--sm{padding:9px 18px;font-size:13.5px;}
.btn--block{width:100%;}

.link-inline{
  color:var(--lake);
  text-decoration:none;
  border-bottom:1px solid rgba(46,110,116,.38);
  transition:color .2s ease,border-color .2s ease;
}
.link-inline:hover,.link-inline:focus-visible{
  color:var(--clay);
  border-bottom-color:var(--clay);
}

/* ==========================================================================
   面包屑
   ========================================================================== */
.breadcrumb{padding-block:clamp(14px,2.4vw,26px);}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--line);
}
.breadcrumb__list li{display:flex;align-items:center;gap:8px;}
.breadcrumb__list li + li::before{
  content:"/";
  color:rgba(125,110,97,.45);
}
.breadcrumb__list a{color:var(--line);text-decoration:none;}
.breadcrumb__list a:hover,.breadcrumb__list a:focus-visible{color:var(--clay);}
.breadcrumb__list [aria-current="page"]{color:var(--ink);}

/* ==========================================================================
   卡片与标签
   ========================================================================== */
.card{
  background:var(--cream);
  border:var(--hair);
  border-radius:var(--radius-md);
  padding:clamp(18px,2.4vw,28px);
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.card:hover{
  transform:translateY(-3px);
  border-color:rgba(142,68,47,.4);
  box-shadow:0 20px 34px -28px rgba(33,23,20,.9);
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 12px;
  border-radius:var(--radius-pill);
  background:rgba(155,192,189,.34);
  color:var(--lake-deep);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  line-height:1.5;
  white-space:nowrap;
}
.tag--gold{background:rgba(197,154,74,.26);color:var(--gold-deep);}
.tag--clay{background:rgba(142,68,47,.14);color:var(--clay);}

/* ==========================================================================
   图片取景框（页面阶段放置图片使用）
   ========================================================================== */
.media-frame{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius-md);
  border:var(--hair);
  background:var(--paper-shadow);
  aspect-ratio:16/10;
  isolation:isolate;
}
.media-frame > img,
.media-frame > picture,
.media-frame > picture > img{
  width:100%;
  height:100%;
  display:block;
  object-fit:cover;
}
.media-frame > picture{height:100%;}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:
    linear-gradient(160deg,rgba(142,68,47,.14) 0%,rgba(142,68,47,0) 46%,rgba(20,41,44,.22) 100%);
}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--tall{aspect-ratio:4/5;}
.media-frame--square{aspect-ratio:1/1;}
.media-frame__caption{
  margin:10px 0 0;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--line);
}

/* ==========================================================================
   动效：进入视口渐显 / 目录高亮 / 返回顶部
   ========================================================================== */
.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s ease,transform .55s cubic-bezier(.22,.7,.3,1);
  will-change:opacity,transform;
}
.js [data-reveal].is-visible{
  opacity:1;
  transform:none;
  will-change:auto;
}

.toc__link.is-active{
  color:var(--clay);
  font-weight:700;
}

.to-top{
  position:fixed;
  right:clamp(14px,3vw,32px);
  bottom:clamp(14px,3vw,32px);
  z-index:70;
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:11px 20px;
  border:0;
  border-radius:var(--radius-pill);
  background:var(--ink);
  color:var(--cream);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  box-shadow:0 18px 30px -22px rgba(0,0,0,.95);
  transition:opacity .25s ease,transform .25s ease,visibility .25s ease,background-color .2s ease;
}
.to-top[data-visible="true"]{
  opacity:1;
  visibility:visible;
  transform:none;
}
.to-top:hover{background:var(--clay);}
.to-top__arrow{font-size:13px;line-height:1;}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1200px){
  .footer-grid{grid-template-columns:1.6fr 1fr 1fr;}
  .footer-contact{grid-column:1 / -1;border-top:var(--hair-light);padding-top:24px;}
  .footer-contact__item{max-width:60ch;}
}

@media (max-width:1080px){
  .header-rule{display:none;}
  .nav-toggle{display:inline-flex;}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    flex-direction:column;
    align-items:stretch;
    background:var(--cream);
    border-bottom:var(--hair);
    box-shadow:0 26px 42px -32px rgba(33,23,20,.85);
    padding:6px var(--gutter) 22px;
    max-height:calc(100dvh - 72px);
    overflow-y:auto;
  }
  .site-nav[data-open="true"]{display:flex;}
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    width:100%;
  }
  .site-nav__link{
    width:100%;
    padding:14px 6px;
    border-radius:0;
    border-bottom:1px solid rgba(125,110,97,.2);
    font-size:16px;
    justify-content:flex-start;
  }
  .site-nav__link:hover{background:rgba(197,154,74,.14);}
  .site-nav__link[aria-current="page"]{
    background:transparent;
    color:var(--clay);
    box-shadow:inset 3px 0 0 var(--clay);
    padding-left:14px;
  }
  .site-nav__link[aria-current="page"] .site-nav__idx{color:var(--clay);}
}

@media (max-width:960px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid--split,.grid--split-reverse{grid-template-columns:minmax(0,1fr);}
}

@media (max-width:720px){
  body{font-size:16.5px;line-height:1.82;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-brand__line{max-width:none;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .panel{border-radius:22px;}
  .brand-mark__name{font-size:18px;}
  .brand-mark__glyph{width:36px;height:36px;font-size:17px;border-radius:12px;}
}

@media (max-width:640px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr);}
  .to-top{padding:10px 16px;font-size:11px;}
}

/* ==========================================================================
   降低动效偏好
   ========================================================================== */
@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;
  }
  .js [data-reveal]{opacity:1;transform:none;}
  .btn:hover,.card:hover,.footer-list a:hover,.brand-mark:hover .brand-mark__glyph{transform:none;}
  .to-top{transform:none;}
}