/* ============================================================
   大红鹰官网 · 共享样式 /assets/site.css
   城市坐标门户 · 展览画册式骨架 · 双层信息导航
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,fieldset{margin:0}
ul,ol{padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0}
a{color:inherit;text-decoration:none}
img,svg,canvas{display:block;max-width:100%}
img{height:auto}
table{border-collapse:collapse}
:where(h1,h2,h3,h4){text-wrap:balance}

/* ---------- 2. 设计变量 ---------- */
:root{
  /* 色彩体系 */
  --paper:#F4EFE6;
  --paper-deep:#EBE3D6;
  --ink:#1D1A17;
  --feather:#3B2A22;
  --city:#6D777E;
  --sky:#D8DEE1;
  --signal:#C4511E;
  --signal-deep:#A1401A;
  --teal:#2F7C82;
  --teal-deep:#24646A;
  --mist:#D5E7E5;
  --gold:#9A7436;
  --gold-light:#C6A167;
  --brick:#9E3F30;

  /* 宽度与圆角 */
  --shell:1280px;
  --gutter:clamp(1.05rem,4vw,2.75rem);
  --r-pill:999px;
  --r-lg:26px;
  --r-md:16px;
  --r-sm:10px;

  /* 字体 */
  --font-display:"HarmonyOS Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SF Mono",SFMono-Regular,Consolas,"Liberation Mono","Courier New",monospace;

  /* 动效 */
  --ease:cubic-bezier(.3,.7,.3,1);
  --t-fast:160ms;
  --t-mid:220ms;

  /* 线与影 */
  --line:1px solid rgba(29,26,23,.14);
  --line-strong:1px solid rgba(29,26,23,.28);
  --line-light:1px solid rgba(244,239,230,.16);
  --shadow-soft:0 22px 46px -30px rgba(29,26,23,.55);
}

/* ---------- 3. 中文排版基础 ---------- */
body{
  background:var(--paper);
  color:var(--feather);
  font-family:var(--font-body);
  font-size:clamp(16px,.35vw + 15.2px,17.5px);
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:800;
  color:var(--ink);
  line-height:1.16;
  letter-spacing:-.005em;
}
h2{font-size:clamp(1.4rem,2.6vw,2.05rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.45rem);font-weight:700}
h4{font-size:1.05rem;font-weight:700;color:var(--feather)}
p{text-wrap:pretty}
strong{font-weight:700;color:var(--ink)}
::selection{background:var(--mist);color:var(--ink)}

/* ---------- 4. 通用工具 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.sr-only{
  position:absolute!important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);
  white-space:nowrap;border:0;
}
.mono{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  font-variant-numeric:tabular-nums;
  text-transform:none;
}
.section{padding-block:clamp(2.6rem,6vw,5.2rem)}
.section--flush{padding-block:0}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(1rem,2vw,1.85rem);
}
.media-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(min(100%,16rem),1fr));
  gap:clamp(1rem,2.4vw,1.7rem);
}

/* ---------- 5. 焦点与可达性 ---------- */
:focus-visible{
  outline:2px solid var(--teal);
  outline-offset:3px;
}
.header-top :focus-visible,
.site-footer :focus-visible{outline-color:var(--mist)}
.btn--signal:focus-visible{outline-color:var(--ink)}
.skip-link{
  position:fixed;
  top:.55rem;left:50%;
  z-index:300;
  transform:translate(-50%,-170%);
  padding:.68rem 1.25rem;
  border-radius:var(--r-pill);
  background:var(--ink);
  color:var(--paper);
  font-size:.86rem;
  font-weight:600;
  letter-spacing:.08em;
  box-shadow:var(--shadow-soft);
  transition:transform var(--t-mid) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translate(-50%,0)}

/* ---------- 6. 按钮 ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--ink);
  --btn-bd:rgba(29,26,23,.28);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45em;
  padding:.62em 1.2em;
  border:1px solid var(--btn-bd);
  border-radius:var(--r-pill);
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-family:var(--font-body);
  font-size:.88rem;
  font-weight:600;
  letter-spacing:.04em;
  line-height:1.4;
  white-space:nowrap;
  cursor:pointer;
  transition:background var(--t-fast) var(--ease),color var(--t-fast) var(--ease),
             border-color var(--t-fast) var(--ease),transform var(--t-fast) var(--ease),
             box-shadow var(--t-fast) var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--sm{font-size:.79rem;padding:.5em .98em;letter-spacing:.05em}
.btn--signal{
  --btn-bg:var(--signal);
  --btn-fg:#FCF8F2;
  --btn-bd:var(--signal);
  box-shadow:0 10px 22px -16px rgba(196,81,30,.95);
}
.btn--signal:hover{--btn-bg:var(--signal-deep);--btn-bd:var(--signal-deep)}
.btn--ghost{
  --btn-fg:var(--paper);
  --btn-bd:rgba(244,239,230,.42);
  --btn-bg:transparent;
}
.btn--ghost:hover{--btn-bg:rgba(244,239,230,.13);--btn-bd:rgba(244,239,230,.72)}
.btn--ink{--btn-bg:var(--ink);--btn-fg:var(--paper);--btn-bd:var(--ink)}
.btn--ink:hover{--btn-bg:var(--feather)}
.btn--line{--btn-fg:var(--teal-deep);--btn-bd:rgba(47,124,130,.5)}
.btn--line:hover{--btn-bg:var(--mist);--btn-bd:var(--teal)}

/* ---------- 7. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:var(--paper);
  border-bottom:1px solid rgba(29,26,23,.16);
}
.header-meter{
  height:2px;
  background:var(--sky);
  overflow:hidden;
}
.header-meter__bar{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--teal) 0%,var(--signal) 100%);
  transition:transform 120ms linear;
}
.header-top{
  background:var(--ink);
  color:var(--paper);
}
.header-top__inner{
  display:flex;
  align-items:center;
  gap:clamp(.7rem,2vw,1.6rem);
  padding-block:.72rem;
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  flex:0 0 auto;
  color:inherit;
}
.brand__glyph{
  position:relative;
  flex:0 0 auto;
  width:2.3rem;
  height:2.3rem;
  border-radius:10px;
  background:linear-gradient(148deg,var(--signal) 0%,var(--brick) 100%);
  overflow:hidden;
  box-shadow:inset 0 0 0 1px rgba(244,239,230,.22);
}
.brand__glyph::before,
.brand__glyph::after{
  content:"";
  position:absolute;
  left:-22%;right:-22%;
  height:2px;
  background:rgba(244,239,230,.9);
  transform:rotate(-32deg);
}
.brand__glyph::before{top:38%}
.brand__glyph::after{top:60%;opacity:.55}
.brand__lockup{display:flex;flex-direction:column;gap:.18rem;line-height:1.1}
.brand__name{
  font-family:var(--font-display);
  font-size:1.14rem;
  font-weight:800;
  letter-spacing:.16em;
  color:var(--paper);
}
.brand__tagline{
  font-size:.66rem;
  letter-spacing:.18em;
  color:rgba(244,239,230,.6);
}
.header-coord{
  flex:1 1 auto;
  min-width:0;
  overflow:hidden;
  white-space:nowrap;
  text-align:center;
  font-size:.7rem;
  letter-spacing:.16em;
  color:rgba(244,239,230,.52);
}
.header-actions{
  display:flex;
  align-items:center;
  gap:.5rem;
  flex:0 0 auto;
  margin-left:auto;
}

/* 移动索引按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:.55rem;
  flex:0 0 auto;
  padding:.55rem .9rem;
  border:1px solid rgba(244,239,230,.4);
  border-radius:var(--r-pill);
  color:var(--paper);
  font-size:.79rem;
  font-weight:600;
  cursor:pointer;
  transition:background var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.nav-toggle:hover{background:rgba(244,239,230,.12);border-color:rgba(244,239,230,.7)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:1.05rem;
  height:2px;
  background:currentColor;
  transition:background var(--t-fast) var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  height:2px;
  background:currentColor;
  transition:transform var(--t-fast) var(--ease);
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__label{letter-spacing:.14em}

/* 栏目索引带 */
.header-index{
  display:flex;
  align-items:center;
  gap:1rem;
  padding-block:.5rem;
}
.index-list{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  min-width:0;
}
.index-list li{display:flex;align-items:center}
.index-list li + li{border-left:1px solid rgba(29,26,23,.14)}
.index-list a{
  display:inline-flex;
  align-items:baseline;
  gap:.42rem;
  padding:.42rem .88rem;
  border-radius:var(--r-pill);
  font-size:.9rem;
  font-weight:600;
  color:var(--feather);
  transition:background var(--t-fast) var(--ease),color var(--t-fast) var(--ease),
             transform var(--t-fast) var(--ease);
}
.index-list__num{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.1em;
  color:var(--city);
  transition:color var(--t-fast) var(--ease);
}
.index-list__label{letter-spacing:.03em}
.index-list a:hover{
  background:var(--mist);
  color:var(--teal-deep);
  transform:translateY(-1px);
}
.index-list a:hover .index-list__num{color:var(--teal)}
.index-list a[aria-current="page"]{
  background:var(--sky);
  color:var(--ink);
  box-shadow:inset 0 -2px 0 0 var(--signal);
}
.index-list a[aria-current="page"] .index-list__num{color:var(--signal)}
.header-index__note{
  margin-left:auto;
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.14em;
  color:var(--city);
  white-space:nowrap;
}
.header-index__note::before{
  content:"";
  display:inline-block;
  width:.4rem;height:.4rem;
  margin-right:.5rem;
  vertical-align:.08em;
  border-radius:50%;
  background:var(--gold);
}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,8vw,6rem);
  background:var(--ink);
  color:var(--paper);
  font-size:.94rem;
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg,rgba(244,239,230,.06) 0 1px,transparent 1px 92px),
    repeating-linear-gradient(0deg,rgba(244,239,230,.045) 0 1px,transparent 1px 92px);
  -webkit-mask-image:linear-gradient(to bottom,rgba(0,0,0,.95),transparent 82%);
  mask-image:linear-gradient(to bottom,rgba(0,0,0,.95),transparent 82%);
}
.footer-grid{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1.4fr) repeat(2,minmax(0,.78fr)) minmax(0,1.15fr);
  gap:clamp(1.5rem,3.6vw,3rem);
  padding-block:clamp(2.4rem,6vw,4rem) clamp(1.6rem,4vw,2.6rem);
}
.footer-brand{min-width:0}
.brand--footer{margin-bottom:1.1rem}
.brand--footer .brand__name{color:var(--paper)}
.brand--footer .brand__tagline{color:rgba(244,239,230,.58)}
.footer-brand__summary{
  max-width:34ch;
  color:rgba(244,239,230,.72);
  font-size:.92rem;
  line-height:1.85;
}
.footer-brand__version{
  display:inline-flex;
  align-items:center;
  margin-top:1.15rem;
  padding:.32rem .82rem;
  border:1px dashed rgba(198,161,103,.55);
  border-radius:var(--r-pill);
  color:var(--gold-light);
  font-size:.66rem;
  letter-spacing:.14em;
}
.footer-col{min-width:0}
.footer-col__title{
  margin-bottom:.9rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  font-weight:500;
  letter-spacing:.24em;
  color:rgba(244,239,230,.48);
}
.footer-col__list{display:grid;gap:.05rem}
.footer-col__list a{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  padding:.4rem 0;
  color:rgba(244,239,230,.86);
  font-size:.92rem;
  transition:color var(--t-fast) var(--ease),transform var(--t-fast) var(--ease);
}
.footer-col__list a::before{
  content:"";
  width:.5rem;
  height:1px;
  background:var(--teal);
  transition:width var(--t-fast) var(--ease),background var(--t-fast) var(--ease);
}
.footer-col__list a:hover{color:#FFFDF9;transform:translateX(2px)}
.footer-col__list a:hover::before{width:1rem;background:var(--signal)}
.footer-contact{min-width:0}
.footer-contact__row{
  display:flex;
  flex-direction:column;
  gap:.12rem;
  padding-block:.5rem;
  border-bottom:1px dashed rgba(244,239,230,.15);
}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:.63rem;
  letter-spacing:.2em;
  color:rgba(244,239,230,.44);
}
.footer-contact__value{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem;
  color:var(--paper);
  font-size:.94rem;
  line-height:1.55;
  word-break:break-word;
}
.footer-contact__note{
  margin-top:.95rem;
  color:rgba(244,239,230,.55);
  font-size:.79rem;
  line-height:1.75;
  max-width:36ch;
}
.copy-btn{
  display:inline-flex;
  align-items:center;
  padding:.16rem .58rem;
  border:1px solid rgba(244,239,230,.28);
  border-radius:var(--r-pill);
  color:rgba(244,239,230,.76);
  font-family:var(--font-mono);
  font-size:.63rem;
  letter-spacing:.14em;
  cursor:pointer;
  transition:background var(--t-fast) var(--ease),color var(--t-fast) var(--ease),
             border-color var(--t-fast) var(--ease);
}
.copy-btn:hover{background:rgba(47,124,130,.34);border-color:var(--teal);color:#FFFDF9}
.copy-btn[data-copied="true"]{background:var(--teal);border-color:var(--teal);color:#FFFDF9}
.footer-base{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.5rem 1.6rem;
  padding-block:1.1rem 1.7rem;
  border-top:1px solid rgba(244,239,230,.15);
  color:rgba(244,239,230,.55);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.1em;
}

/* ---------- 9. 基础排版组件 ---------- */
.display{
  font-family:var(--font-display);
  font-size:clamp(2rem,4.8vw,3.9rem);
  font-weight:800;
  line-height:1.06;
  letter-spacing:-.015em;
  color:var(--ink);
}
.display--sm{font-size:clamp(1.55rem,3.1vw,2.55rem);line-height:1.14}
.lede{
  max-width:58ch;
  font-size:clamp(1.02rem,1.35vw,1.2rem);
  line-height:1.82;
  color:var(--feather);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.24em;
  color:var(--city);
}
.eyebrow::before{
  content:"";
  width:1.7rem;
  height:1px;
  background:var(--signal);
}
.rule-ticks{
  height:12px;
  border-bottom:1px solid rgba(29,26,23,.22);
  background-image:repeating-linear-gradient(90deg,rgba(29,26,23,.26) 0 1px,transparent 1px 16px);
  background-size:100% 6px;
  background-repeat:no-repeat;
  background-position:0 0;
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.3rem .72rem;
  border-radius:var(--r-pill);
  background:var(--mist);
  color:var(--teal-deep);
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.1em;
  line-height:1.6;
}
.tag--gold{background:rgba(154,116,54,.15);color:#7C5D28}
.tag--signal{background:rgba(196,81,30,.13);color:var(--signal-deep)}
.tag--warn{background:rgba(158,63,48,.13);color:var(--brick)}
.panel{
  padding:clamp(1.25rem,3vw,2.3rem);
  border:1px solid rgba(29,26,23,.1);
  border-radius:var(--r-lg);
  background:#FBF7F0;
  box-shadow:var(--shadow-soft);
}
.panel--sky{background:var(--sky);border-color:rgba(29,26,23,.08);box-shadow:none}
.panel--mist{background:linear-gradient(158deg,var(--mist) 0%,#EEF4F3 65%,var(--paper-deep) 100%);border-color:rgba(47,124,130,.18);box-shadow:none}

/* 面包屑 */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  color:var(--city);
}
.breadcrumb a{color:var(--teal-deep);transition:color var(--t-fast) var(--ease)}
.breadcrumb a:hover{color:var(--signal)}
.breadcrumb__sep{color:var(--sky)}
.breadcrumb [aria-current="page"]{color:var(--feather)}

/* 长阅读正文 */
.prose{max-width:68ch;font-size:1rem;line-height:1.85;color:var(--feather)}
.prose > * + *{margin-top:.9em}
.prose h2{margin-top:1.9em;font-size:clamp(1.3rem,2.2vw,1.7rem)}
.prose h3{margin-top:1.6em}
.prose ul,.prose ol{padding-left:1.35em}
.prose ul{list-style:none}
.prose ul li{position:relative}
.prose ul li::before{
  content:"";
  position:absolute;
  left:-1.05em;top:.78em;
  width:.42rem;height:1px;
  background:var(--teal);
}
.prose ol{list-style:decimal;color:var(--feather)}
.prose ol li::marker{font-family:var(--font-mono);color:var(--teal);font-size:.85em}
.prose a{color:var(--teal-deep);border-bottom:1px solid rgba(47,124,130,.4)}
.prose a:hover{color:var(--signal);border-bottom-color:var(--signal)}
.prose blockquote{
  padding-left:1.1rem;
  border-left:3px solid var(--signal);
  color:var(--feather);
}
.prose hr{border:0;border-top:1px dashed rgba(29,26,23,.2);margin-block:1.8em}

/* ---------- 10. 图片容器基础规则 ---------- */
.figure{display:grid;gap:.7rem;margin:0}
.figure__frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border-radius:var(--r-lg);
  background:linear-gradient(142deg,var(--sky) 0%,var(--mist) 55%,var(--paper-deep) 100%);
  box-shadow:inset 0 0 0 1px rgba(29,26,23,.09);
}
.figure__frame::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    repeating-linear-gradient(90deg,rgba(29,26,23,.075) 0 1px,transparent 1px 42px),
    repeating-linear-gradient(0deg,rgba(29,26,23,.06) 0 1px,transparent 1px 42px);
}
.figure__frame::after{
  content:"";
  position:absolute;
  right:-14%;bottom:-32%;
  width:64%;height:82%;
  transform:rotate(-18deg);
  background:linear-gradient(158deg,rgba(47,124,130,.24),rgba(196,81,30,.17));
}
.figure__img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure__caption{
  display:flex;
  align-items:baseline;
  gap:.55rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.1em;
  color:var(--city);
}
.figure__caption::before{content:"▸";color:var(--teal)}
.figure--wide .figure__frame{aspect-ratio:21 / 9}
.figure--tall .figure__frame{aspect-ratio:3 / 4}
.figure--square .figure__frame{aspect-ratio:1 / 1}

/* ---------- 11. 显现（配合 JS） ---------- */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity 420ms var(--ease),transform 420ms var(--ease);
}
html.js [data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1080px){
  .header-coord{display:none}
}
@media (max-width:1024px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:900px){
  .site-header{position:static}
  .header-top__inner{padding-block:.68rem}
  .nav-toggle{display:inline-flex}
  .header-actions .btn--sm{font-size:.76rem;padding:.46em .82em}
  .header-index{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    max-height:0;
    padding-block:0;
    overflow:hidden;
    opacity:0;
    visibility:hidden;
    transition:max-height var(--t-mid) var(--ease),opacity var(--t-fast) var(--ease),
               visibility var(--t-mid),padding var(--t-mid) var(--ease);
  }
  .header-index[data-open]{
    max-height:34rem;
    padding-block:.5rem 0;
    opacity:1;
    visibility:visible;
  }
  .index-list{flex-direction:column;align-items:stretch;padding-block:.2rem}
  .index-list li + li{border-left:0;border-top:1px dashed rgba(29,26,23,.16)}
  .index-list a{
    width:100%;
    justify-content:flex-start;
    padding:.72rem .5rem;
    border-radius:var(--r-sm);
    font-size:.96rem;
  }
  .index-list a[aria-current="page"]{box-shadow:inset 3px 0 0 0 var(--signal)}
  .header-index__note{margin:0;padding:.75rem .5rem 1rem}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:1fr;gap:1.7rem}
  .footer-base{flex-direction:column;align-items:flex-start;gap:.35rem}
  .figure__frame{border-radius:var(--r-md)}
}
@media (max-width:560px){
  .brand__tagline{display:none}
  .brand__glyph{width:2.05rem;height:2.05rem}
  .header-actions{gap:.4rem}
  .header-actions .btn--sm{font-size:.72rem;padding:.44em .74em;letter-spacing:.02em}
  .nav-toggle{padding:.5rem .74rem;font-size:.74rem}
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr))}
  .display{font-size:clamp(1.75rem,8vw,2.4rem)}
}

/* ---------- 13. 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .btn:hover,.index-list a:hover,.footer-col__list a:hover{transform:none}
}
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}

/* ---------- 14. 打印 ---------- */
@media print{
  body{background:#fff;color:#000;font-size:12pt}
  .header-meter,.nav-toggle,.skip-link,.copy-btn{display:none!important}
  .site-header{position:static;border-bottom:1px solid #999}
  .header-top{background:#fff;color:#000}
  .header-top__inner{color:#000}
  .brand__name,.brand__tagline{color:#000}
  .brand__glyph{background:#000}
  .header-index{max-height:none!important;opacity:1!important;visibility:visible!important;padding-block:.4rem}
  .index-list a{color:#000}
  .site-footer{background:#fff;color:#000;margin-top:1.5rem}
  .site-footer::before{display:none}
  .footer-brand__summary,.footer-contact__value,.footer-col__list a{color:#000}
  .footer-brand__version{color:#000;border-color:#666}
  .footer-base{color:#333;border-top:1px solid #999}
  a{text-decoration:none}
}