/* ==========================================================================
   永利中国站 · 共享样式 /assets/site.css
   深海墨绿为底，鎏金为结构线，霓虹青只出现在数据处
   ========================================================================== */

/* 1. 令牌与重置 */
:root{
  --ink:#0B2B26;
  --ink-deep:#061A17;
  --ink-soft:#0A231F;
  --gold:#C9A227;
  --gold-soft:#E7CE7A;
  --cyan:#39D9C7;
  --amber:#E8863A;
  --paper:#F4F0E6;
  --graphite:#141A18;
  --muted:#9AA8A3;
  --zone-a:#3E6E5F;
  --zone-b:#46598C;
  --zone-c:#8A5A4A;
  --zone-d:#6A5A8C;
  --line:rgba(201,162,39,.34);
  --line-soft:rgba(154,168,163,.24);
  --shadow-lg:0 12px 32px rgba(0,0,0,.45);
  --shadow-md:0 18px 40px rgba(0,0,0,.5);
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,"Times New Roman",serif;
  --font-sans:"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","IBM Plex Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --wrap:1180px;
  --wrap-wide:1320px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

*,*::before,*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:150px;
}

body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  overflow-x:hidden;
}

img,svg,video{display:block;max-width:100%;height:auto;}
[hidden]{display:none !important;}

h1,h2,h3,h4{
  font-family:var(--font-serif);
  font-weight:900;
  line-height:1.2;
  letter-spacing:-.01em;
  margin:0 0 .6em;
  color:var(--paper);
}

a{color:var(--gold-soft);text-decoration:none;}
a:hover{color:var(--cyan);}

button{font-family:inherit;}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:2px;
  border-radius:2px;
}

/* 2. 版心与节奏 */
.wrap{width:min(100% - 40px,var(--wrap));margin-inline:auto;}
.wrap--wide{width:min(100% - 40px,var(--wrap-wide));margin-inline:auto;}

.section{padding:clamp(48px,7vw,96px) 0;position:relative;}
.section--paper{background:var(--paper);color:var(--graphite);}
.section--paper h1,.section--paper h2,.section--paper h3{color:var(--graphite);}
.section--deep{background:var(--ink-deep);}
.section--line{border-top:1px solid var(--line);}

.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:16px;
  border-bottom:2px solid var(--line);
  padding-bottom:16px;
  margin-bottom:clamp(24px,3vw,40px);
}
.section__title{font-size:clamp(1.8rem,3vw,2.8rem);margin:0;}

.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:.78rem;
  letter-spacing:.12em;
  color:var(--gold);
  text-transform:uppercase;
  margin:0 0 10px;
}
.section--paper .eyebrow{color:#8A6B12;}

.grid{display:grid;gap:clamp(18px,2.4vw,28px);}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));}

.layout-side{
  display:grid;
  grid-template-columns:220px minmax(0,1fr);
  gap:clamp(28px,4vw,56px);
  align-items:start;
}

.stagger>*{margin-top:0;}
@media (min-width:768px){
  .stagger>*:nth-child(2n){margin-top:24px;}
  .stagger>*:nth-child(3n){margin-top:40px;}
}

/* 3. 跳转链接 */
.skip-link{
  position:fixed;
  top:-80px;
  left:16px;
  z-index:400;
  background:var(--gold);
  color:var(--ink-deep);
  font-size:.85rem;
  font-weight:700;
  padding:10px 18px;
  border-radius:2px;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:8px;color:var(--ink-deep);}

/* 4. 吸顶外壳 */
.site-head{
  position:sticky;
  top:0;
  z-index:120;
  background:var(--ink-deep);
  border-bottom:2px solid var(--line);
}

.read-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  display:block;
  z-index:300;
  pointer-events:none;
}
.read-progress__bar{
  display:block;
  height:100%;
  width:100%;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:0 50%;
}

/* 工具条 */
.toolbar{
  height:32px;
  overflow:hidden;
  background:var(--ink-deep);
  border-bottom:1px solid var(--line-soft);
  transition:height .24s var(--ease),opacity .24s var(--ease);
}
.toolbar__inner{
  height:100%;
  width:min(100% - 40px,var(--wrap-wide));
  margin-inline:auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  font-size:.76rem;
  letter-spacing:.08em;
  color:var(--muted);
}
.toolbar__meta{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.toolbar__quick{display:flex;gap:18px;}
.toolbar__quick a{
  color:var(--muted);
  border-bottom:1px solid transparent;
  padding-bottom:2px;
  white-space:nowrap;
}
.toolbar__quick a:hover{color:var(--gold-soft);border-bottom-color:var(--gold);}
.toolbar__quick a[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--cyan);}

/* 刊头 */
.masthead{padding:14px 0 0;transition:padding .24s var(--ease);}
.masthead__inner{
  width:min(100% - 40px,var(--wrap-wide));
  margin-inline:auto;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:14px;
}
.masthead__lead{display:flex;align-items:center;gap:14px;min-width:0;}
.masthead__issue{
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.14em;
  color:var(--muted);
  white-space:nowrap;
  transition:opacity .2s var(--ease);
}
.masthead__tail{display:flex;justify-content:flex-end;}
.masthead__cta{
  font-size:.82rem;
  letter-spacing:.08em;
  color:var(--gold-soft);
  border:1px solid var(--line);
  padding:7px 14px;
  white-space:nowrap;
  transition:background .18s var(--ease),color .18s var(--ease);
}
.masthead__cta:hover{background:var(--gold);color:var(--ink-deep);border-color:var(--gold);}

.brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-self:center;
  text-align:center;
  color:var(--paper);
}
.brand:hover{color:var(--paper);}
.brand__name{
  font-family:var(--font-serif);
  font-weight:900;
  font-size:clamp(1.5rem,3vw,2.15rem);
  letter-spacing:.14em;
  color:var(--gold-soft);
  line-height:1.1;
  transition:font-size .24s var(--ease);
}
.brand__sub{
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.22em;
  color:var(--muted);
  margin-top:5px;
}
.brand--foot{align-items:flex-start;justify-self:start;text-align:left;}
.brand--foot .brand__name{font-size:1.4rem;}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  background:transparent;
  border:1px solid var(--line);
  color:var(--gold-soft);
  padding:8px 12px;
  font-size:.78rem;
  letter-spacing:.1em;
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);color:var(--cyan);}
.nav-toggle__bars{position:relative;display:block;width:16px;height:2px;background:currentColor;}
.nav-toggle__bars::before,
.nav-toggle__bars::after{content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;}
.nav-toggle__bars::before{top:-5px;}
.nav-toggle__bars::after{top:5px;}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan);}

/* 5. 主导航 */
.masthead__navwrap{width:min(100% - 40px,var(--wrap-wide));margin-inline:auto;}
.mainnav{
  border-top:1px solid var(--line);
  margin-top:12px;
  transition:margin-top .24s var(--ease);
}
.mainnav__list{
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap:clamp(8px,2.4vw,34px);
  list-style:none;
  margin:0;
  padding:0;
}
.mainnav__link{
  display:block;
  padding:13px 2px 11px;
  font-size:.92rem;
  letter-spacing:.08em;
  color:var(--muted);
  border-bottom:2px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease),padding .24s var(--ease);
}
.mainnav__link:hover{color:var(--gold-soft);border-bottom-color:var(--gold);}
.mainnav__link[aria-current="page"]{color:var(--gold-soft);border-bottom-color:var(--cyan);}

.mainnav__foot{display:none;}
.mainnav__foottitle{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.16em;
  color:var(--gold);
  margin:28px 0 10px;
}
.mainnav__footlinks{display:flex;flex-direction:column;gap:4px;}
.mainnav__footlinks a{color:var(--muted);font-size:.88rem;padding:6px 0;}
.mainnav__footlinks a:hover{color:var(--gold-soft);}

/* 吸顶紧凑态 */
.site-head[data-stuck="true"] .toolbar{height:0;opacity:0;border-bottom-color:transparent;}
.site-head[data-stuck="true"] .masthead{padding-top:6px;}
.site-head[data-stuck="true"] .brand__sub{display:none;}
.site-head[data-stuck="true"] .brand__name{font-size:1.2rem;}
.site-head[data-stuck="true"] .masthead__issue{opacity:0;}
.site-head[data-stuck="true"] .mainnav{margin-top:4px;}
.site-head[data-stuck="true"] .mainnav__link{padding:9px 2px 8px;font-size:.86rem;}

/* 6. 页脚 */
.site-foot{
  background:var(--ink-deep);
  border-top:2px solid var(--line);
  color:var(--muted);
  padding:clamp(40px,5vw,64px) 0 0;
}
.site-foot__inner{
  display:grid;
  grid-template-columns:minmax(260px,1.1fr) 1.4fr;
  gap:clamp(28px,4vw,64px);
  padding-bottom:clamp(32px,4vw,48px);
}
.site-foot__brand{display:flex;flex-direction:column;gap:14px;align-items:flex-start;}
.site-foot__tagline{
  margin:0;
  font-size:.88rem;
  line-height:1.9;
  color:var(--muted);
  max-width:34ch;
}
.site-foot__contact{
  margin:0;
  font-family:var(--font-mono);
  font-size:.82rem;
  line-height:1.9;
  color:var(--gold-soft);
  word-break:break-word;
}
.site-foot__cols{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  gap:clamp(20px,3vw,36px);
}
.site-foot__coltitle{
  font-family:var(--font-mono);
  font-size:.74rem;
  font-weight:400;
  letter-spacing:.16em;
  color:var(--gold);
  margin:0 0 12px;
}
.site-foot__links{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px;}
.site-foot__links a{
  color:var(--muted);
  font-size:.9rem;
  padding-bottom:2px;
  border-bottom:1px solid transparent;
}
.site-foot__links a:hover{color:var(--gold-soft);border-bottom-color:var(--gold);}
.site-foot__legal{
  border-top:1px solid var(--line-soft);
  padding:20px 0 28px;
  width:min(100% - 40px,var(--wrap-wide));
  margin-inline:auto;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 24px;
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.06em;
  color:var(--muted);
}
.site-foot__icp{color:var(--gold-soft);}
.site-foot__note{
  margin:0;
  flex:1 1 100%;
  font-family:var(--font-sans);
  font-size:.8rem;
  letter-spacing:0;
  color:var(--muted);
}

/* 7. 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:12px 22px;
  border:2px solid var(--gold);
  background:transparent;
  color:var(--gold-soft);
  font-size:.9rem;
  letter-spacing:.06em;
  cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{background:var(--gold);color:var(--ink-deep);}
.btn--solid{background:var(--gold);color:var(--ink-deep);}
.btn--solid:hover{background:var(--gold-soft);border-color:var(--gold-soft);}
.btn--cyan{border-color:var(--cyan);color:var(--cyan);}
.btn--cyan:hover{background:var(--cyan);color:var(--ink-deep);}

/* 8. 面包屑 */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  list-style:none;
  margin:0 0 20px;
  padding:0;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.1em;
  color:var(--muted);
}
.breadcrumb a{color:var(--muted);}
.breadcrumb a:hover{color:var(--gold-soft);}
.breadcrumb li+li::before{content:"/";margin-right:10px;color:var(--gold);}

/* 9. 正文 */
.prose{max-width:68ch;font-size:1.02rem;line-height:1.8;color:rgba(244,240,230,.88);}
.prose p{margin:0 0 1.6em;}
.prose h2{font-size:clamp(1.5rem,2.4vw,2rem);color:var(--gold-soft);margin:2.2em 0 .7em;}
.prose h3{font-size:1.15rem;color:var(--gold-soft);margin:1.8em 0 .5em;}
.prose ul,.prose ol{padding-left:1.3em;margin:0 0 1.6em;}
.prose li{margin-bottom:.5em;}
.prose--light{color:var(--graphite);}
.prose--light h2,.prose--light h3{color:var(--ink);}

.num,.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em;}

/* 10. 专题研究板 */
.board{
  display:grid;
  gap:18px;
  border:2px solid var(--gold);
  background:linear-gradient(180deg,rgba(6,26,23,.94),rgba(11,43,38,.9));
  box-shadow:var(--shadow-lg);
  padding:clamp(20px,3vw,34px);
}
.board__part{border-top:1px dashed var(--line);padding-top:14px;}
.board__part:first-child{border-top:0;padding-top:0;}
.board__label{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.16em;
  color:var(--cyan);
  margin:0 0 8px;
}
.board__part p{margin:0 0 .8em;font-size:.96rem;}
.board__part p:last-child{margin-bottom:0;}

/* 11. 卡片与数字卡 */
.card{
  border:1px solid var(--line-soft);
  background:rgba(6,26,23,.6);
  padding:clamp(18px,2.2vw,26px);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease);
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--line);}
.card__title{font-family:var(--font-serif);font-size:1.2rem;margin:0 0 8px;color:var(--gold-soft);}
.card__meta{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.1em;color:var(--muted);margin:0;}

.data-card{
  border:2px solid var(--line);
  background:var(--ink-deep);
  box-shadow:var(--shadow-lg);
  padding:clamp(18px,2.2vw,26px);
}

.stat{
  border:2px solid var(--line);
  border-left:6px solid var(--cyan);
  background:var(--ink-deep);
  box-shadow:var(--shadow-lg);
  padding:18px 20px;
}
.stat__value{
  display:block;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(1.7rem,3.4vw,2.5rem);
  line-height:1.1;
  color:var(--cyan);
}
.stat__label{
  display:block;
  margin-top:6px;
  font-size:.8rem;
  letter-spacing:.08em;
  color:var(--muted);
}

/* 12. 分区标签 */
.zone-tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  padding:5px 10px;
  color:var(--muted);
  background:rgba(6,26,23,.6);
  border:1px solid var(--line-soft);
  border-left:6px solid var(--muted);
}
.zone-tag--a{color:#9FD3C2;border-left-color:var(--zone-a);}
.zone-tag--b{color:#A9B6DE;border-left-color:var(--zone-b);}
.zone-tag--c{color:#D9A894;border-left-color:var(--zone-c);}
.zone-tag--d{color:#BCA9DE;border-left-color:var(--zone-d);}

/* 13. 表格 */
.table-wrap{
  overflow:auto;
  border:2px solid var(--line);
  background:rgba(6,26,23,.7);
  box-shadow:var(--shadow-lg);
}
.data-table{
  width:100%;
  min-width:560px;
  border-collapse:collapse;
  font-size:.92rem;
}
.data-table thead th{
  position:sticky;
  top:0;
  z-index:2;
  background:var(--ink-deep);
  color:var(--gold-soft);
  font-family:var(--font-mono);
  font-size:.74rem;
  font-weight:400;
  letter-spacing:.12em;
  text-align:left;
  padding:12px 14px;
  border-bottom:2px solid var(--line);
  white-space:nowrap;
}
.data-table td{
  padding:12px 14px;
  border-bottom:1px solid var(--line-soft);
  color:rgba(244,240,230,.88);
  vertical-align:top;
}
.data-table tbody tr:nth-child(even){background:rgba(244,240,230,.035);}
.data-table td.num,.data-table th.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}
.th-sort{
  display:inline-flex;
  align-items:center;
  gap:6px;
  background:none;
  border:0;
  padding:0;
  color:inherit;
  font:inherit;
  letter-spacing:inherit;
  cursor:pointer;
}
.th-sort::after{content:"↕";color:var(--muted);font-size:.8em;}
th[aria-sort="ascending"] .th-sort::after{content:"▲";color:var(--cyan);}
th[aria-sort="descending"] .th-sort::after{content:"▼";color:var(--cyan);}
.table-wrap--paper{border-color:rgba(20,26,24,.35);background:var(--paper);}
.table-wrap--paper .data-table thead th{background:var(--ink);}
.table-wrap--paper .data-table td{color:var(--graphite);border-bottom-color:rgba(20,26,24,.12);}
.table-wrap--paper .data-table tbody tr:nth-child(even){background:rgba(11,43,38,.06);}

/* 14. 索引带 */
.index-strip{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:1px;
  background:var(--line);
  border:2px solid var(--line);
}
.index-strip__item{
  display:block;
  background:var(--ink-deep);
  color:var(--paper);
  padding:18px 20px;
  transition:background .18s var(--ease);
}
.index-strip__item:hover{background:var(--ink-soft);color:var(--paper);}
.index-strip__item .card__title{font-size:1.05rem;}
.index-strip__item .card__meta{margin-top:6px;}

/* 15. 侧边目录 */
.toc{
  position:sticky;
  top:150px;
  border-left:2px solid var(--line-soft);
  padding:4px 0;
}
.toc a{
  display:block;
  margin-left:-2px;
  padding:9px 0 9px 16px;
  border-left:2px solid transparent;
  font-size:.86rem;
  line-height:1.5;
  color:var(--muted);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.toc a:hover{color:var(--gold-soft);}
.toc a.is-active,.toc a[aria-current="true"]{
  color:var(--gold-soft);
  border-left-color:var(--gold);
}

/* 16. 筛选 */
.filters{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:22px;}
.filter-chip{
  border:1px solid var(--line-soft);
  background:transparent;
  color:var(--muted);
  padding:7px 14px;
  font-size:.82rem;
  letter-spacing:.06em;
  cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.filter-chip:hover{color:var(--gold-soft);border-color:var(--gold);}
.filter-chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:var(--ink-deep);}

/* 17. 复制字段与提示 */
.copy-field{
  display:inline-flex;
  align-items:center;
  gap:12px;
  max-width:100%;
  padding:14px 20px;
  border:2px solid rgba(57,217,199,.4);
  background:rgba(6,26,23,.75);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:clamp(.95rem,2vw,1.3rem);
  letter-spacing:.02em;
  text-align:left;
  cursor:pointer;
  word-break:break-all;
  transition:border-color .18s var(--ease),background .18s var(--ease);
}
.copy-field:hover{border-color:var(--cyan);background:rgba(6,26,23,.95);}

.toast{
  position:fixed;
  left:50%;
  bottom:28px;
  transform:translate(-50%,16px);
  z-index:400;
  background:var(--gold);
  color:var(--ink-deep);
  font-size:.84rem;
  letter-spacing:.04em;
  padding:11px 20px;
  box-shadow:var(--shadow-lg);
  opacity:0;
  pointer-events:none;
  transition:opacity .2s var(--ease),transform .2s var(--ease);
}
.toast[data-visible]{opacity:1;transform:translate(-50%,0);}

/* 18. 提示块 */
.callout{
  border-left:6px solid var(--amber);
  background:rgba(232,134,58,.09);
  padding:16px 20px;
  font-size:.94rem;
  color:rgba(244,240,230,.9);
}
.section--paper .callout{color:var(--graphite);background:rgba(232,134,58,.14);}

/* 19. 图片容器 */
.media-frame{
  position:relative;
  overflow:hidden;
  border:2px solid var(--line);
  background:linear-gradient(140deg,var(--ink-deep),var(--ink));
  box-shadow:var(--shadow-lg);
  aspect-ratio:16 / 9;
}
.media-frame--tall{aspect-ratio:3 / 4;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame img,
.media-frame svg,
.media-frame picture,
.media-frame canvas{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame__caption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:14px 16px 12px;
  background:linear-gradient(0deg,rgba(6,26,23,.94),rgba(6,26,23,0));
  font-size:.8rem;
  letter-spacing:.04em;
  color:var(--muted);
}

/* 20. 返回顶部与显现 */
.back-top{
  position:fixed;
  right:20px;
  bottom:20px;
  z-index:200;
  width:44px;
  height:44px;
  border:2px solid var(--gold);
  background:var(--ink-deep);
  color:var(--gold-soft);
  font-size:.95rem;
  line-height:1;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transition:opacity .2s var(--ease),visibility .2s var(--ease),background .18s var(--ease);
}
.back-top[data-visible]{opacity:1;visibility:visible;}
.back-top:hover{background:var(--gold);color:var(--ink-deep);}

.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
.js [data-reveal].is-in{opacity:1;transform:none;}

/* 21. 响应式 */
@media (max-width:1100px){
  .layout-side{grid-template-columns:minmax(0,1fr);}
  .toc{position:static;border-left:0;border-top:2px solid var(--line-soft);padding-top:12px;}
  .toc a{margin-left:0;border-left:0;border-top:2px solid transparent;padding:8px 0;}
  .toc a.is-active,.toc a[aria-current="true"]{border-left:0;border-top-color:var(--gold);}
}

@media (max-width:900px){
  html{scroll-padding-top:96px;}
  .nav-toggle{display:inline-flex;}
  .masthead__issue{display:none;}
  .masthead__inner{grid-template-columns:auto 1fr auto;gap:10px;}
  .brand{align-items:flex-start;justify-self:start;text-align:left;}
  .brand__name{letter-spacing:.08em;}
  .masthead__navwrap{width:100%;}

  .mainnav{
    position:fixed;
    top:0;
    right:0;
    bottom:0;
    width:min(360px,86vw);
    margin:0;
    border-top:0;
    border-left:2px solid var(--gold);
    background:var(--ink-deep);
    padding:76px 24px 32px;
    overflow-y:auto;
    transform:translateX(102%);
    transition:transform .28s var(--ease);
    z-index:150;
  }
  .mainnav[data-open]{transform:translateX(0);box-shadow:-18px 0 48px rgba(0,0,0,.55);}
  .mainnav__list{flex-direction:column;align-items:stretch;gap:0;}
  .mainnav__list li{border-bottom:1px solid var(--line-soft);}
  .mainnav__link{
    padding:14px 2px;
    font-size:1rem;
    border-bottom:2px solid transparent;
  }
  .mainnav__link[aria-current="page"]{color:var(--cyan);border-bottom-color:transparent;}
  .mainnav__foot{display:block;}
  body[data-nav-open]{overflow:hidden;}
}

@media (max-width:640px){
  .toolbar__meta{display:none;}
  .toolbar__inner{justify-content:center;width:100%;padding:0 16px;}
  .toolbar__quick{gap:14px;}
  .masthead__cta{display:none;}
  .masthead__inner{width:min(100% - 28px,var(--wrap-wide));}
  .site-foot__inner{grid-template-columns:minmax(0,1fr);}
  .site-foot__legal{gap:8px 16px;}
  .back-top{right:14px;bottom:14px;}
}

/* 22. 动效降级 */
@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;}
  .card:hover{transform:none;}
}