/* ===== 0. 设计变量 ===== */
:root{
  --ink:#0B1F1A;
  --table:#14161A;
  --layer:#123028;
  --gold:#D4AF37;
  --gold-hi:#F1D98B;
  --violet:#7B4DFF;
  --cyan:#12E0C0;
  --red:#D6352F;
  --paper:#F2EFE6;
  --fog:#6E7A76;
  --edge:3px;
  --sx:8px;
  --sy:8px;
  --maxw:1240px;
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --mono:"JetBrains Mono","SFMono-Regular","Cascadia Mono",Consolas,"DejaVu Sans Mono",monospace;
}

/* ===== 1. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100%;
  overflow-x:hidden;
  background-color:var(--ink);
  background-image:
    radial-gradient(circle at 10% -6%, rgba(123,77,255,.20), transparent 44%),
    radial-gradient(circle at 94% 4%, rgba(18,224,192,.13), transparent 40%),
    linear-gradient(180deg,#0B1F1A 0%,#0A1A16 100%);
  color:var(--paper);
  font-family:var(--sans);
  font-size:16px;
  font-weight:400;
  line-height:1.8;
}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
figure{margin:0}
:focus{outline:none}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;box-shadow:0 0 0 4px rgba(18,224,192,.22)}

/* ===== 2. 中文排版 ===== */
h1,h2,h3,h4,h5{
  font-family:var(--serif);
  font-weight:900;
  line-height:1.24;
  letter-spacing:.02em;
  margin:0 0 .55em;
  color:var(--gold-hi);
}
h1{font-size:clamp(30px,4.6vw,52px)}
h2{font-size:clamp(23px,3.2vw,36px)}
h3{font-size:clamp(19px,2.4vw,26px)}
h4{font-size:18px}
h1 span,h2 span{color:var(--gold)}
p{margin:0 0 1.05em;max-width:44em}
a{color:var(--cyan);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--gold-hi)}
strong,b{font-weight:700;color:#fff}
hr{border:0;height:1px;background:rgba(110,122,118,.4);margin:26px 0}
.prose p{max-width:34em}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.3em}
.prose li{margin:0 0 .5em}
.prose ul li{list-style:square;color:var(--cyan)}
.prose li>*{color:var(--paper)}

/* ===== 3. 基础容器与网格 ===== */
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 22px}
.wrap--narrow{max-width:860px}
.grid{display:grid;gap:22px}
.grid--split{grid-template-columns:minmax(0,1.6fr) minmax(0,1fr)}
.grid--aside{grid-template-columns:minmax(0,1fr) 268px}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.cluster{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.section-label{
  display:flex;align-items:center;gap:12px;
  font-family:var(--mono);font-size:12px;letter-spacing:.22em;
  color:var(--gold);text-transform:uppercase;margin:0 0 16px;
}
.section-label::after{
  content:"";height:2px;flex:1;
  background:linear-gradient(90deg,var(--gold),rgba(18,224,192,.7),transparent);
}
.band{
  background:var(--layer);
  border-top:var(--edge) solid #000;
  border-bottom:var(--edge) solid #000;
  padding:28px 0;
}
.band--violet{background:linear-gradient(110deg,rgba(123,77,255,.22),rgba(11,31,26,.92) 58%),var(--layer)}
.band--stripe{background:repeating-linear-gradient(90deg,rgba(18,224,192,.07) 0 3px,transparent 3px 9px),var(--layer)}
.diag{clip-path:polygon(0 0,100% 0,100% 84%,0 100%)}
.diag--alt{clip-path:polygon(0 7%,100% 0,100% 100%,0 100%)}

/* ===== 4. 通用按钮 / 徽标 / 编号 ===== */
.skip-link{
  position:fixed;left:16px;top:-80px;z-index:200;
  padding:10px 18px;background:var(--gold-hi);color:var(--table);
  font-weight:700;text-decoration:none;border:var(--edge) solid #000;
  transition:top .18s ease;
}
.skip-link:focus{top:12px}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;font-family:var(--sans);font-weight:700;font-size:15px;
  letter-spacing:.06em;text-decoration:none;cursor:pointer;
  border:var(--edge) solid var(--gold);background:var(--table);color:var(--gold-hi);
  box-shadow:6px 6px 0 rgba(0,0,0,.6);
  transition:transform .16s ease,box-shadow .16s ease,color .16s ease,border-color .16s ease,background .16s ease;
}
.btn:hover,.btn:focus-visible{
  transform:translate(-2px,-2px);box-shadow:8px 8px 0 rgba(0,0,0,.65);
  color:#fff;border-color:var(--cyan);
}
.btn--gold{background:linear-gradient(180deg,var(--gold-hi),var(--gold));color:var(--table);border-color:#000}
.btn--gold:hover,.btn--gold:focus-visible{color:var(--table);border-color:var(--violet)}
.btn--ghost{background:transparent;border-color:rgba(242,239,230,.45);color:var(--paper)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--mono);font-size:11.5px;font-weight:700;letter-spacing:.1em;
  padding:4px 9px;border:1px solid var(--red);color:#fff;background:rgba(214,53,47,.18);
}
.badge--gold{border-color:var(--gold);color:var(--gold-hi);background:rgba(212,175,55,.14)}
.badge--cyan{border-color:var(--cyan);color:var(--cyan);background:rgba(18,224,192,.12)}
.badge--violet{border-color:var(--violet);color:#C6B0FF;background:rgba(123,77,255,.18)}
.num{
  font-family:var(--mono);font-weight:700;letter-spacing:.04em;
  color:var(--gold-hi);border-bottom:1px solid var(--cyan);padding-bottom:1px;
}

/* ===== 5. 头部刊头 ===== */
.site-header{
  position:sticky;top:0;z-index:90;
  background:linear-gradient(180deg,#0C221C 0%,#0B1F1A 100%);
  border-bottom:var(--edge) solid #000;
  box-shadow:0 6px 0 rgba(0,0,0,.55);
}
.scroll-meter{height:4px;background:#0A1714;border-bottom:1px solid rgba(0,0,0,.7)}
.scroll-meter__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--violet),var(--cyan) 55%,var(--gold));
}
.masthead-shell{max-width:var(--maxw);margin:0 auto;padding:12px 22px 0}
.masthead-top{
  display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;
  border-bottom:1px solid rgba(110,122,118,.32);padding-bottom:10px;
}
.masthead-kicker{
  display:flex;align-items:center;gap:10px;margin:0;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;color:var(--fog);
}
.kicker-dot{width:8px;height:8px;background:var(--cyan);box-shadow:0 0 10px var(--cyan);flex:none}
.kicker-sep{color:var(--violet)}
.kicker-mono{color:var(--gold-hi)}
.masthead-utility{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.util-link{
  font-size:12.5px;letter-spacing:.08em;text-decoration:none;
  color:var(--paper);background:var(--table);
  border:1px solid rgba(212,175,55,.5);padding:6px 12px;
  transition:border-color .16s ease,color .16s ease,background .16s ease;
}
.util-link:hover{border-color:var(--cyan);color:var(--cyan);background:#0F1D19}
.util-link--accent{border-color:var(--red);background:rgba(214,53,47,.16);color:#fff}
.util-link--accent:hover{border-color:var(--gold-hi);color:var(--gold-hi)}
.masthead-core{
  position:relative;display:flex;align-items:center;justify-content:center;
  padding:16px 0 14px;
}
.masthead-brand{display:flex;align-items:center;gap:14px;text-decoration:none;color:inherit}
.brand-mark{
  flex:none;width:52px;height:52px;display:grid;place-items:center;
  border:var(--edge) solid var(--gold);background:var(--table);
  color:var(--gold-hi);font-family:var(--serif);font-weight:900;font-size:26px;
  box-shadow:var(--sx) var(--sy) 0 rgba(0,0,0,.6);
}
.brand-text{display:block}
.brand-name{
  display:block;
  font-family:var(--serif);font-weight:900;letter-spacing:.06em;
  font-size:clamp(24px,4vw,40px);line-height:1.1;
  background:linear-gradient(180deg,#F6E5AC 0%,#D4AF37 72%,#A9832A 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  text-shadow:0 1px 0 rgba(18,224,192,.35);
}
.brand-sub{
  display:block;margin-top:4px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.24em;color:var(--fog);
}
.nav-toggle{
  display:none;align-items:center;gap:9px;cursor:pointer;
  background:var(--table);color:var(--gold-hi);
  border:var(--edge) solid var(--gold);padding:9px 13px;
  font-family:var(--mono);font-size:12.5px;letter-spacing:.12em;
  box-shadow:4px 4px 0 rgba(0,0,0,.6);
  transition:border-color .16s ease,color .16s ease,transform .16s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px}
.nav-toggle__bars i{display:block;width:16px;height:2px;background:currentColor;transition:transform .18s ease,opacity .18s ease}
.site-header[data-open] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars i:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.masthead-nav{
  display:block;
  border-top:2px solid #000;
  background-image:repeating-linear-gradient(90deg,rgba(18,224,192,.06) 0 2px,transparent 2px 7px);
}
.nav-list{display:flex;justify-content:center;flex-wrap:wrap}
.nav-item{border-left:1px solid rgba(110,122,118,.3)}
.nav-item:last-child{border-right:1px solid rgba(110,122,118,.3)}
.nav-link{
  position:relative;display:block;padding:14px 20px;
  color:var(--paper);text-decoration:none;
  font-weight:500;font-size:15px;letter-spacing:.08em;
  transition:color .16s ease,background .16s ease;
}
.nav-link:hover,.nav-link:focus-visible{color:var(--cyan);background:rgba(18,224,192,.08)}
.nav-link[aria-current="page"]{color:var(--table);background:linear-gradient(180deg,var(--gold-hi),var(--gold))}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--cyan);
}
/* 滚动后刊头收窄 */
.site-header[data-scrolled] .masthead-shell{padding-top:6px}
.site-header[data-scrolled] .masthead-top{padding-bottom:5px;border-bottom-color:transparent}
.site-header[data-scrolled] .masthead-kicker{font-size:10px;letter-spacing:.12em}
.site-header[data-scrolled] .util-link{padding:4px 9px;font-size:11.5px}
.site-header[data-scrolled] .masthead-core{padding:6px 0 4px}
.site-header[data-scrolled] .brand-mark{width:34px;height:34px;font-size:18px;box-shadow:4px 4px 0 rgba(0,0,0,.6)}
.site-header[data-scrolled] .brand-name{font-size:20px;letter-spacing:.04em}
.site-header[data-scrolled] .brand-sub{display:none}
.site-header[data-scrolled] .nav-link{padding:8px 14px;font-size:13.5px}

/* ===== 6. 页脚 ===== */
.site-footer{
  position:relative;margin-top:72px;
  background:linear-gradient(180deg,#123028 0%,#0B1F1A 72%);
  border-top:var(--edge) solid #000;
  padding:0 0 26px;
}
.footer-stripe{
  height:6px;
  background:repeating-linear-gradient(90deg,var(--gold) 0 44px,var(--violet) 44px 88px,var(--cyan) 88px 132px,var(--red) 132px 176px);
}
.footer-shell{max-width:var(--maxw);margin:0 auto;padding:34px 22px 0}
.footer-grid{
  display:grid;gap:28px;
  grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr));
}
.footer-mark{
  margin:0 0 10px;font-family:var(--serif);font-weight:900;font-size:26px;
  color:var(--gold-hi);letter-spacing:.04em;
  text-shadow:0 1px 0 rgba(18,224,192,.3);
}
.footer-note{margin:0 0 16px;font-size:13.5px;line-height:1.75;color:var(--fog);max-width:36em}
.footer-cta{margin-top:2px}
.footer-heading{
  margin:0 0 12px;padding-bottom:8px;
  font-family:var(--mono);font-size:11.5px;font-weight:700;letter-spacing:.2em;
  color:var(--gold);border-bottom:1px solid rgba(212,175,55,.35);
}
.footer-heading--sub{margin-top:22px}
.footer-list a{
  display:block;padding:5px 0;font-size:14px;color:var(--paper);
  text-decoration:none;border-left:2px solid transparent;
  transition:color .15s ease,padding-left .15s ease,border-color .15s ease;
}
.footer-list a:hover,.footer-list a:focus-visible{color:var(--cyan);border-left-color:var(--cyan);padding-left:8px}
.footer-contact{font-size:13.5px}
.footer-contact li{display:flex;gap:10px;padding:6px 0;border-top:1px dashed rgba(110,122,118,.35)}
.footer-contact .k{
  flex:0 0 46px;font-family:var(--mono);font-size:11px;letter-spacing:.1em;
  color:var(--gold);padding-top:3px;
}
.footer-contact .v{color:var(--paper);word-break:break-word}
.footer-bottom{
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
  margin-top:32px;padding-top:18px;
  border-top:1px solid rgba(110,122,118,.3);
  font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--fog);
}
.footer-bottom p{margin:0}
.footer-icp{color:var(--gold-hi)}
.to-top{
  position:fixed;right:20px;bottom:24px;z-index:95;
  display:inline-flex;align-items:center;gap:8px;cursor:pointer;
  padding:10px 14px;background:var(--table);color:var(--gold-hi);
  border:var(--edge) solid var(--gold);box-shadow:6px 6px 0 rgba(0,0,0,.6);
  font-family:var(--mono);font-size:12px;letter-spacing:.1em;
  opacity:0;pointer-events:none;transform:translateY(12px);
  transition:opacity .2s ease,transform .2s ease,border-color .16s ease,color .16s ease;
}
.to-top[data-visible]{opacity:1;pointer-events:auto;transform:translateY(0)}
.to-top:hover{border-color:var(--cyan);color:var(--cyan)}
.to-top__arrow{font-size:11px;color:var(--cyan)}

/* ===== 7. 通用内容组件 ===== */
.breadcrumb{
  display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px;
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--fog);
}
.breadcrumb a{color:var(--fog);text-decoration:none}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb .breadcrumb__sep{color:var(--violet)}
.breadcrumb [aria-current="page"]{color:var(--gold-hi)}
.panel{
  position:relative;background:var(--table);
  border:var(--edge) solid #000;box-shadow:var(--sx) var(--sy) 0 rgba(0,0,0,.55);
  padding:22px;
}
.panel--layer{background:var(--layer)}
.panel--flush{padding:0;overflow:hidden}
.panel__head{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:10px;
  border-bottom:1px solid rgba(110,122,118,.35);padding-bottom:12px;margin-bottom:16px;
}
.panel__title{margin:0;font-family:var(--serif);font-weight:900;font-size:20px;color:var(--gold-hi)}
.panel__meta{margin:0;font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--fog)}
.scan-panel{overflow:hidden}
.scan-panel::after{
  content:"";position:absolute;left:0;right:0;top:-32%;height:32%;pointer-events:none;z-index:3;
  background:linear-gradient(180deg,rgba(18,224,192,0),rgba(18,224,192,.22),rgba(18,224,192,0));
  animation:scan-down 1.15s ease-out 1 both;
}
@keyframes scan-down{
  0%{top:-32%;opacity:0}
  18%{opacity:1}
  100%{top:108%;opacity:0}
}
.card{
  background:var(--table);border:var(--edge) solid #000;
  box-shadow:6px 6px 0 rgba(0,0,0,.5);padding:18px;
  transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:6px 12px 0 rgba(0,0,0,.55);border-color:var(--gold)}
.card__num{display:block;font-family:var(--mono);font-weight:700;font-size:12px;letter-spacing:.1em;color:var(--gold);margin-bottom:8px}
.card__title{margin:0 0 8px;font-family:var(--serif);font-weight:900;font-size:19px;color:var(--gold-hi)}
.card__text{margin:0 0 12px;font-size:14.5px;color:var(--paper)}
.card__foot{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-family:var(--mono);font-size:11.5px;color:var(--fog)}
.rail{position:relative}
.rail__track{
  display:flex;gap:16px;overflow-x:auto;padding:6px 4px 20px;
  scroll-snap-type:x mandatory;scrollbar-color:var(--gold) var(--layer);
}
.rail__track::-webkit-scrollbar{height:8px}
.rail__track::-webkit-scrollbar-track{background:var(--layer);border:1px solid rgba(0,0,0,.6)}
.rail__track::-webkit-scrollbar-thumb{background:var(--gold)}
.rail__item{flex:0 0 min(300px,78vw);scroll-snap-align:start}
.stack-index{border-left:var(--edge) solid var(--layer)}
.stack-index__item{position:relative;border-bottom:1px solid rgba(110,122,118,.28)}
.stack-index__item:nth-child(even){margin-left:26px;border-left:1px solid rgba(110,122,118,.28)}
.stack-index__link{
  display:grid;grid-template-columns:92px minmax(0,1fr) auto;gap:14px;align-items:baseline;
  padding:16px 14px;text-decoration:none;color:var(--paper);background:rgba(11,31,26,.6);
  transition:background .16s ease,box-shadow .16s ease,color .16s ease;
}
.stack-index__link:hover{background:var(--layer);color:#fff}
.stack-index__link[aria-current="true"]{background:var(--layer);box-shadow:inset 3px 0 0 var(--cyan)}
.stack-index__num{font-family:var(--mono);font-weight:700;color:var(--gold);font-size:13px}
.stack-index__title{font-family:var(--serif);font-weight:900;font-size:18px;color:var(--gold-hi)}
.stack-index__meta{font-family:var(--mono);font-size:11.5px;color:var(--fog)}
.toc{
  position:sticky;top:132px;background:var(--table);
  border:var(--edge) solid #000;box-shadow:6px 6px 0 rgba(0,0,0,.5);padding:14px;
}
.toc__title{margin:0 0 10px;font-family:var(--mono);font-size:11.5px;letter-spacing:.2em;color:var(--gold)}
.toc__list a{
  display:block;padding:7px 9px;font-size:14px;color:var(--paper);text-decoration:none;
  border-left:2px solid transparent;transition:color .15s ease,border-color .15s ease,background .15s ease;
}
.toc__list a:hover{color:var(--cyan);border-left-color:var(--cyan)}
.toc__list a[aria-current="true"]{color:var(--table);background:linear-gradient(90deg,var(--gold),var(--gold-hi));border-left-color:var(--cyan)}
.timeline{position:relative;display:flex;align-items:center;gap:0;height:52px;padding:0 6px;background:var(--layer);border:var(--edge) solid #000}
.timeline__dot{
  flex:none;width:12px;height:12px;background:var(--fog);border:2px solid #000;
  transition:background .2s ease,box-shadow .2s ease;
}
.timeline__link{display:inline-flex;align-items:center;justify-content:center;padding:0 18px;height:100%}
.timeline__dot[data-active]{background:var(--cyan);box-shadow:0 0 0 3px rgba(18,224,192,.25);animation:pulse-once .9s ease-out 1}
@keyframes pulse-once{
  0%{transform:scale(.8)}
  50%{transform:scale(1.35)}
  100%{transform:scale(1)}
}
/* 图片容器基础规则（页面阶段放入任意图片） */
.media-frame{
  position:relative;overflow:hidden;background:var(--layer);
  border:var(--edge) solid #000;box-shadow:var(--sx) var(--sy) 0 rgba(0,0,0,.55);
}
.media-frame::before{
  content:"";position:absolute;inset:0;z-index:2;pointer-events:none;opacity:0;
  background-image:repeating-linear-gradient(0deg,rgba(18,224,192,.16) 0 1px,transparent 1px 4px);
  transition:opacity .25s ease;
}
.media-frame:hover::before{opacity:1}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/7}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--pixel{
  aspect-ratio:16/9;
  background-image:
    repeating-linear-gradient(90deg,rgba(123,77,255,.22) 0 8px,transparent 8px 16px),
    repeating-linear-gradient(0deg,rgba(18,224,192,.16) 0 8px,transparent 8px 16px),
    linear-gradient(140deg,#123028,#14161A);
}
.media-frame figcaption{
  position:absolute;left:0;bottom:0;right:0;z-index:3;
  padding:8px 12px;font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--paper);background:rgba(11,31,26,.82);border-top:1px solid rgba(212,175,55,.4);
}

/* ===== 8. 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;
  }
  .card:hover{transform:none}
  .btn:hover{transform:none}
}

/* ===== 9. 响应式 ===== */
@media (max-width:1080px){
  .grid--split{grid-template-columns:minmax(0,1fr)}
  .grid--aside{grid-template-columns:minmax(0,1fr)}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .toc{position:static;top:auto}
}
@media (max-width:860px){
  body{font-size:15.5px;line-height:1.75}
  .masthead-shell{padding:10px 16px 0}
  .masthead-top{flex-direction:column;align-items:flex-start;gap:8px}
  .masthead-core{justify-content:space-between;gap:12px;padding:12px 0 10px}
  .nav-toggle{display:inline-flex}
  .masthead-nav{display:none}
  .masthead-nav[data-open],
  .site-header[data-open] .masthead-nav{display:block}
  .nav-list{flex-direction:column;justify-content:flex-start}
  .nav-item{border-left:0;border-bottom:1px solid rgba(110,122,118,.25)}
  .nav-item:last-child{border-right:0}
  .nav-link{padding:14px 10px;font-size:16px}
  .nav-link[aria-current="page"]::after{left:10px;right:10px}
  .site-header[data-scrolled] .masthead-top{display:none}
  .site-header[data-scrolled] .nav-link{padding:12px 10px;font-size:15px}
  .brand-mark{width:44px;height:44px;font-size:22px}
  .brand-name{font-size:clamp(22px,6vw,30px)}
  .wrap{padding:0 16px}
  .footer-shell{padding:28px 16px 0}
  .to-top{right:14px;bottom:16px;padding:9px 12px}
}
@media (max-width:680px){
  .grid--3{grid-template-columns:minmax(0,1fr)}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .stack-index__item:nth-child(even){margin-left:12px}
  .stack-index__link{grid-template-columns:70px minmax(0,1fr);gap:10px;padding:14px 10px}
  .stack-index__meta{grid-column:2}
  .to-top__label{display:none}
  .media-frame--wide{aspect-ratio:4/3}
}