/* =========================================================
   皇家至尊中心 · royal-zenith.com.cn
   共享样式表 /assets/site.css
   骨架：左右分屏 / 悬浮胶囊导航 / 纸张叠层 / 鎏金坐标
   ========================================================= */

:root{
  --purple-900:#2A1840;
  --purple-700:#452A66;
  --purple-deep:#241636;
  --gold:#C9A227;
  --gold-bright:#E6CD86;
  --gold-bronze:#8A6A1E;
  --ivory:#F7F3EA;
  --paper:#E6E2D8;
  --slate:#7C8390;
  --ink:#1C1E26;

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

  --shell:1280px;
  --gutter:clamp(18px,4vw,56px);
  --header-h:72px;

  --line-ink:1px solid rgba(42,24,64,.14);
  --line-paper:1px solid rgba(42,24,64,.12);
  --line-ivory:1px solid rgba(247,243,234,.16);

  --shadow-paper:0 8px 24px rgba(42,24,64,.08);
  --shadow-lift:0 18px 44px rgba(42,24,64,.16);
  --shadow-nav:0 18px 42px rgba(42,24,64,.28);

  --radius-pill:999px;
  --radius-card:18px;

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:320ms;
  --dur-fast:200ms;
}

/* ---------- 基础重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 40px)}
body{
  margin:0;
  background:var(--ivory);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  font-weight:400;
  letter-spacing:.01em;
  padding-top:calc(var(--header-h) + 32px);
  overflow-x:hidden;
}
body::selection,::selection{background:rgba(201,162,39,.32);color:var(--ink)}
img,picture,svg,video{max-width:100%;height:auto;display:block}
a{color:inherit}
button{font:inherit;color:inherit}
ul,ol{margin:0;padding:0}
table{border-collapse:collapse}
#main-content{display:block;scroll-margin-top:calc(var(--header-h) + 32px)}

/* ---------- 排版 ---------- */
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-serif);
  font-weight:600;
  color:var(--ink);
  line-height:1.2;
  letter-spacing:-.01em;
  margin:0 0 .6em;
}
h1{font-size:clamp(32px,5.4vw,64px)}
h2{font-size:clamp(25px,3.4vw,42px)}
h3{font-size:clamp(19px,2.1vw,26px)}
h4{font-size:18px}
p{margin:0 0 1.1em;color:rgba(28,30,38,.82)}
.lead{font-size:clamp(17px,1.6vw,20px);line-height:1.8;color:rgba(28,30,38,.76);max-width:56ch}
.display-xl{
  font-family:var(--font-serif);
  font-size:clamp(42px,8.4vw,96px);
  font-weight:700;
  line-height:1.04;
  letter-spacing:-.02em;
  margin:0 0 .35em;
}
.display-lg{
  font-family:var(--font-serif);
  font-size:clamp(34px,5.2vw,62px);
  font-weight:600;
  line-height:1.1;
  letter-spacing:-.015em;
  margin:0 0 .4em;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  margin:0 0 14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  color:var(--gold-bronze);
}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--gold)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.annot{margin:0;font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--slate)}
.annot-vertical{
  writing-mode:vertical-rl;text-orientation:mixed;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.24em;color:var(--slate);
}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 布局容器 ---------- */
.container{width:100%;max-width:var(--shell);margin:0 auto;padding-inline:var(--gutter)}
.section{position:relative;padding-block:clamp(44px,6.4vw,92px)}
.section--tight{padding-block:clamp(28px,4vw,56px)}
.section--dark{
  background:linear-gradient(150deg,#241636 0%,#2A1840 58%,#1C1E26 100%);
  color:rgba(247,243,234,.84);
}
.section--dark h1,.section--dark h2,.section--dark h3,.section--dark h4{color:var(--ivory)}
.section--dark p,.section--dark .lead{color:rgba(247,243,234,.76)}
.section--dark .eyebrow{color:var(--gold-bright)}
.section--paper{background:var(--paper)}
.section--edge{border-top:var(--line-ink);border-bottom:var(--line-ink)}
.divider{height:1px;border:0;margin:clamp(26px,4vw,52px) 0;background:linear-gradient(90deg,rgba(201,162,39,.65),rgba(201,162,39,0))}

.split{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:clamp(24px,4vw,68px);align-items:start}
.split--reverse{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.split--even{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
.split--wide-left{grid-template-columns:minmax(0,55fr) minmax(0,45fr)}
.split--wide-right{grid-template-columns:minmax(0,35fr) minmax(0,65fr)}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(14px,2vw,26px)}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}

/* ---------- 纸张叠层卡片 ---------- */
.card{
  position:relative;
  background:var(--ivory);
  border:var(--line-paper);
  border-radius:var(--radius-card);
  padding:clamp(20px,2.4vw,34px);
  box-shadow:var(--shadow-paper);
}
.card::after{
  content:"";position:absolute;right:0;bottom:0;width:22px;height:22px;
  border-right:2px solid var(--gold);border-bottom:2px solid var(--gold);
  border-radius:0 0 var(--radius-card) 0;opacity:.9;
}
.card--dark{background:linear-gradient(150deg,rgba(42,24,64,.96),rgba(69,42,102,.92));border-color:rgba(230,205,134,.28);color:rgba(247,243,234,.8)}
.card--dark h1,.card--dark h2,.card--dark h3,.card--dark h4{color:var(--ivory)}
.card-index{
  display:block;margin-bottom:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--gold-bronze);
}
.card-stack{display:grid;gap:clamp(16px,2vw,26px)}
.card-stack > *:nth-child(3n+2){transform:translateX(clamp(6px,1vw,18px))}
.card-stack > *:nth-child(3n+3){transform:translateX(clamp(3px,.6vw,9px))}
.paper-stack{position:relative;z-index:0}
.paper-stack::before{
  content:"";position:absolute;inset:12px 12px -12px -12px;z-index:-1;
  background:var(--paper);border:var(--line-paper);border-radius:var(--radius-card);
}
.tag{
  display:inline-block;padding:4px 12px;border-radius:var(--radius-pill);
  border:1px solid rgba(201,162,39,.5);background:rgba(201,162,39,.06);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;color:var(--gold-bronze);
}

/* ---------- 编号索引 ---------- */
.index-mark{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.16em;
  color:var(--slate);text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.index-mark::before{
  content:"";width:20px;height:1px;background:currentColor;
  transition:background var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.index-mark.is-current{color:var(--gold-bronze)}
.index-mark.is-current::before{background:var(--gold);transform:scaleX(1.7)}
.section--dark .index-mark{color:rgba(247,243,234,.6)}
.section--dark .index-mark.is-current{color:var(--gold-bright)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 26px;border:1px solid transparent;border-radius:var(--radius-pill);
  font-family:var(--font-sans);font-size:15px;font-weight:600;letter-spacing:.06em;
  text-decoration:none;cursor:pointer;
  transition:transform var(--dur-fast) var(--ease),box-shadow var(--dur) var(--ease),
             background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn-gold{
  background:linear-gradient(135deg,var(--gold-bright),var(--gold));
  color:var(--purple-900);
  box-shadow:0 10px 24px rgba(201,162,39,.28);
}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgba(201,162,39,.34)}
.btn-outline{border-color:rgba(42,24,64,.28);color:var(--purple-900);background:transparent}
.btn-outline:hover{border-color:var(--gold-bronze);color:var(--gold-bronze)}
.btn-ghost{border-color:rgba(230,205,134,.5);color:var(--gold-bright);background:rgba(230,205,134,.08)}
.btn-ghost:hover{background:rgba(230,205,134,.16)}

/* ---------- 面包屑 ---------- */
.breadcrumbs{margin:0 0 clamp(16px,2vw,28px);font-size:13px;color:var(--slate)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:8px;list-style:none}
.breadcrumbs li{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs li + li::before{content:"/";color:rgba(124,131,144,.7)}
.breadcrumbs a{color:var(--slate);text-decoration:none;border-bottom:1px solid rgba(138,106,30,.35)}
.breadcrumbs a:hover{color:var(--gold-bronze)}
.breadcrumbs [aria-current="page"]{color:var(--ink);font-weight:600}

/* ---------- 表格 ---------- */
.table-scroll{
  position:relative;background:var(--ivory);
  border:var(--line-paper);border-radius:var(--radius-card);
  box-shadow:var(--shadow-paper);overflow:hidden;
}
.table-scroll::after{
  content:"";position:absolute;top:0;right:0;bottom:0;width:64px;pointer-events:none;
  background:linear-gradient(90deg,rgba(247,243,234,0),rgba(247,243,234,.96));
  transition:opacity var(--dur) var(--ease);
}
.table-scroll.is-scrolled-end::after{opacity:0}
.table-wrap{overflow-x:auto;overscroll-behavior-x:contain;scrollbar-color:var(--gold) transparent}
.table-wrap:focus-visible{outline-offset:-2px}
.data-table{width:100%;min-width:640px;font-size:15px}
.data-table caption{
  padding:18px 20px 4px;text-align:left;
  font-family:var(--font-serif);font-size:18px;color:var(--ink);
}
.data-table th,.data-table td{
  padding:14px 20px;text-align:left;vertical-align:top;
  border-bottom:1px solid rgba(42,24,64,.1);
}
.data-table thead th{
  position:sticky;top:0;z-index:1;
  background:rgba(230,226,216,.86);
  font-family:var(--font-mono);font-size:12px;font-weight:500;
  letter-spacing:.14em;color:var(--slate);
}
.data-table tbody tr:nth-child(even){background:rgba(230,226,216,.4)}
.data-table .num,.data-table td.num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;text-align:right;
}
.data-table .is-key{
  box-shadow:inset 1px 0 0 rgba(201,162,39,.6),inset -1px 0 0 rgba(201,162,39,.6);
}

/* ---------- 图片容器基础规则 ---------- */
.img-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16 / 10;
  background:
    linear-gradient(122deg,rgba(230,205,134,.16),rgba(230,205,134,0) 42%),
    linear-gradient(150deg,#241636,#452A66 70%,#2A1840);
  border:1px solid rgba(42,24,64,.14);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-paper);
}
.img-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(118deg,rgba(230,205,134,.08) 0 1px,transparent 1px 9px);
}
.img-frame > img,.img-frame > picture,.img-frame > svg{
  width:100%;height:100%;object-fit:cover;display:block;
}
.img-frame--wide{aspect-ratio:21 / 9}
.img-frame--tall{aspect-ratio:3 / 4}
.img-frame--square{aspect-ratio:1 / 1}
.img-frame--paper{
  background:linear-gradient(150deg,var(--paper),var(--ivory));
  border-color:rgba(42,24,64,.14);
}
.img-frame-caption{
  margin:10px 0 0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--slate);
}

/* ---------- 跳转与焦点 ---------- */
.skip-link{
  position:fixed;top:8px;left:50%;z-index:200;
  transform:translate(-50%,-180%);
  padding:12px 22px;border-radius:var(--radius-pill);
  background:var(--purple-900);color:var(--gold-bright);
  border:1px solid var(--gold);text-decoration:none;font-size:14px;
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:4px}
.site-header :focus-visible,.site-footer :focus-visible{outline-color:var(--gold-bright)}

/* =========================================================
   头部：悬浮胶囊导航
   ========================================================= */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:120;
  padding:14px var(--gutter) 0;
  pointer-events:none;
}
.header-inner{
  position:relative;max-width:var(--shell);margin:0 auto;pointer-events:auto;
}
.header-bar{
  position:relative;
  display:flex;align-items:center;gap:clamp(10px,1.6vw,22px);
  padding:9px clamp(14px,1.8vw,22px);
  border-radius:var(--radius-pill);
  background:linear-gradient(122deg,rgba(42,24,64,.97),rgba(69,42,102,.94));
  border:1px solid rgba(230,205,134,.28);
  box-shadow:var(--shadow-nav);
  backdrop-filter:blur(10px);
  transition:padding var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.site-header[data-scrolled="true"] .header-bar{
  padding-block:6px;
  box-shadow:0 12px 26px rgba(42,24,64,.3);
}
.header-progress{
  position:absolute;left:clamp(18px,2vw,26px);right:clamp(18px,2vw,26px);bottom:-7px;height:2px;
  border-radius:2px;background:rgba(230,205,134,.16);overflow:hidden;pointer-events:none;
}
.header-progress::after{
  content:"";display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--gold),var(--gold-bright));
  transform:scaleX(var(--progress,0));transform-origin:left center;
  transition:transform 140ms linear;
}

/* 品牌徽章 */
.brand{
  display:flex;align-items:center;gap:12px;flex:0 0 auto;
  text-decoration:none;color:var(--ivory);
}
.brand-mark{position:relative;display:block;width:34px;height:34px;flex:0 0 auto}
.brand-mark--lg{width:46px;height:46px}
.brand-mark-frame{
  position:absolute;inset:0;border:1px solid var(--gold);
}
.brand-mark-frame--offset{
  inset:6px -6px -6px 6px;border-color:rgba(230,205,134,.55);
}
.brand-mark-thread{
  position:absolute;left:-5px;right:-5px;top:50%;height:1px;
  background:var(--gold-bright);
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-name{font-family:var(--font-serif);font-size:17px;font-weight:600;letter-spacing:.1em}
.brand-tagline{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.22em;
  color:rgba(230,205,134,.86);
}

/* 导航（移动端折叠面板为默认形态） */
.site-nav{
  position:absolute;top:calc(100% + 10px);left:0;right:0;
  display:flex;flex-direction:column;gap:6px;
  padding:14px;
  border-radius:26px;
  background:linear-gradient(160deg,rgba(42,24,64,.99),rgba(69,42,102,.98));
  border:1px solid rgba(230,205,134,.3);
  box-shadow:var(--shadow-nav);
  opacity:0;visibility:hidden;transform:translateY(-10px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) linear;
}
.site-nav[data-open]{
  opacity:1;visibility:visible;transform:translateY(0);
}
.nav-list{list-style:none;display:flex;flex-direction:column;gap:2px}
.nav-link{
  display:block;padding:12px 14px;border-radius:14px;
  color:rgba(247,243,234,.82);text-decoration:none;
  font-size:16px;letter-spacing:.04em;
  transition:background-color var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease);
}
.nav-link:hover{background:rgba(201,162,39,.14);color:var(--ivory)}
.nav-link[aria-current="page"]{
  background:linear-gradient(135deg,var(--gold-bright),var(--gold));
  color:var(--purple-900);font-weight:600;
}
.nav-action{
  display:flex;align-items:center;justify-content:center;
  margin-top:8px;padding:13px 20px;
  border-radius:14px;border:1px dashed rgba(230,205,134,.5);
  background:rgba(230,205,134,.1);
  color:var(--gold-bright);text-decoration:none;
  font-size:15px;letter-spacing:.06em;
}
.nav-action:hover{background:rgba(230,205,134,.18)}

/* 头部动作区 */
.header-actions{display:flex;align-items:center;gap:8px;margin-left:auto}
.nav-utility{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 14px;border-radius:var(--radius-pill);
  border:1px solid rgba(230,205,134,.45);
  color:var(--gold-bright);text-decoration:none;
  font-size:13px;letter-spacing:.08em;white-space:nowrap;
  transition:background-color var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease);
}
.nav-utility:hover{background:rgba(230,205,134,.14);border-color:var(--gold-bright)}
.nav-utility-dot{
  width:6px;height:6px;border-radius:50%;background:var(--gold-bright);
  box-shadow:0 0 0 3px rgba(230,205,134,.22);
}
.header-coord{display:none;gap:18px;margin:0}

/* 移动端汉堡 */
.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 16px;border-radius:var(--radius-pill);
  background:rgba(230,205,134,.1);
  border:1px solid rgba(230,205,134,.45);
  color:var(--gold-bright);
  font-size:13px;letter-spacing:.14em;cursor:pointer;
}
.nav-toggle-bars{display:grid;gap:3px;width:16px}
.nav-toggle-bars span{
  display:block;height:1.5px;background:currentColor;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(4.5px) 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(-4.5px) rotate(-45deg)}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  position:relative;isolation:isolate;overflow:hidden;
  margin-top:clamp(64px,9vw,132px);
  padding:clamp(44px,6.6vw,88px) var(--gutter) 32px;
  color:rgba(247,243,234,.82);
  background:
    radial-gradient(120% 90% at 6% 0%,rgba(201,162,39,.16),transparent 58%),
    radial-gradient(90% 70% at 100% 100%,rgba(69,42,102,.9),transparent 62%),
    linear-gradient(155deg,#241636 0%,#2A1840 52%,#1C1E26 100%);
}
.site-footer::before{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background-image:repeating-linear-gradient(118deg,rgba(230,205,134,.06) 0 1px,transparent 1px 10px);
}
.footer-inner{max-width:var(--shell);margin:0 auto}
.footer-rule{
  height:1px;margin-bottom:clamp(26px,4vw,48px);
  background:linear-gradient(90deg,rgba(201,162,39,0),var(--gold),rgba(201,162,39,0));
}
.footer-top{display:grid;grid-template-columns:1fr;gap:clamp(30px,5vw,64px)}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:14px}
.footer-brand-name{
  margin:0;font-family:var(--font-serif);font-size:clamp(22px,2.6vw,28px);
  font-weight:600;letter-spacing:.08em;color:var(--ivory);
}
.footer-brand-line{margin:0;font-size:14px;letter-spacing:.18em;color:var(--gold-bright)}
.footer-brand-note{margin:0;max-width:38ch;font-size:14.5px;line-height:1.8;color:rgba(247,243,234,.66)}
.footer-nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(22px,3vw,36px)}
.footer-col-title{
  margin:0 0 12px;font-family:var(--font-mono);font-size:12px;font-weight:500;
  letter-spacing:.2em;color:var(--gold);
}
.footer-list{list-style:none;display:flex;flex-direction:column;gap:9px}
.footer-link{
  display:inline-block;font-size:14.5px;text-decoration:none;
  color:rgba(247,243,234,.74);border-bottom:1px solid transparent;
  transition:color var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:var(--gold-bright);border-bottom-color:rgba(230,205,134,.6)}
.footer-contact{
  display:grid;gap:14px;margin-top:clamp(30px,5vw,56px);
  padding-top:clamp(22px,3vw,32px);border-top:var(--line-ivory);
}
.footer-contact-item{display:flex;flex-direction:column;gap:6px;margin:0}
.footer-contact-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--slate)}
.footer-contact-value{font-size:14.5px;color:rgba(247,243,234,.86)}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 28px;
  margin-top:clamp(26px,4vw,44px);padding-top:20px;border-top:var(--line-ivory);
  font-size:13px;color:rgba(247,243,234,.6);
}
.footer-legal{margin:0;font-family:var(--font-mono);letter-spacing:.06em}
.footer-closing{margin:0;letter-spacing:.14em;color:var(--gold-bright)}

/* =========================================================
   滚动显现
   ========================================================= */
.js-reveal [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease);
  transition-delay:calc(var(--reveal-delay,0) * 60ms);
}
.js-reveal [data-reveal].is-visible{opacity:1;transform:none}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:900px){
  .split,.split--reverse,.split--even,.split--wide-left,.split--wide-right{grid-template-columns:minmax(0,1fr)}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .span-3,.span-4{grid-column:span 3}
  .span-5,.span-6{grid-column:span 6}
  .span-7,.span-8{grid-column:span 6}
  .card-stack > *:nth-child(3n+2),.card-stack > *:nth-child(3n+3){transform:none}
}
@media (max-width:640px){
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr))}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 2}
  .nav-utility{padding:7px 12px;font-size:12px}
  .footer-nav{grid-template-columns:minmax(0,1fr)}
}

@media (min-width:640px){
  .footer-contact{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:820px){
  .footer-contact{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (min-width:900px){
  .footer-top{grid-template-columns:minmax(260px,.9fr) 1.6fr}
  .footer-nav{grid-template-columns:repeat(4,minmax(0,1fr))}
}

/* 平板与桌面：胶囊恢复水平排布 */
@media (min-width:1024px){
  :root{--header-h:88px}
  .site-nav{
    position:static;flex-direction:row;align-items:center;gap:6px;
    padding:0;border:0;border-radius:0;background:none;box-shadow:none;
    opacity:1;visibility:visible;transform:none;
  }
  .nav-list{flex-direction:row;align-items:center;gap:2px}
  .nav-link{padding:8px 11px;font-size:14px;border-radius:var(--radius-pill);white-space:nowrap}
  .nav-action{display:none}
  .nav-toggle{display:none}
  .brand-name{font-size:16.5px}
}
@media (min-width:1320px){
  .nav-link{font-size:14.5px;padding:8px 13px}
  .nav-action{
    display:inline-flex;margin:0 0 0 8px;padding:9px 18px;
    border:0;border-radius:var(--radius-pill);
    background:linear-gradient(135deg,var(--gold-bright),var(--gold));
    color:var(--purple-900);font-weight:600;letter-spacing:.05em;
  }
  .nav-action:hover{background:linear-gradient(135deg,#F0DEA3,var(--gold-bright))}
  .header-coord{
    display:flex;margin:0 auto 0 8px;
    font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
    color:rgba(230,205,134,.66);white-space:nowrap;
  }
}

/* 减少动态 */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .js-reveal [data-reveal]{opacity:1;transform:none;transition:none;transition-delay:0ms}
  .card-stack > *{transform:none}
  .btn:hover{transform:none}
  .header-progress::after{transition:none}
}